Abstract

Disclosed are a delivery cylinder and a manufacturing method thereof, and pumping equipment comprising same. The delivery cylinder preparation method comprises the following steps: forming a first intermediate cylinder body by machining; performing high-frequency induction hardening on an inner surface of the first intermediate cylinder body, forming a hardened layer on the inner surface of the first intermediate cylinder body, and forming a second intermediate cylinder body; and electroplating a chromium layer on an inner surface of the hardened layer, thereby forming the delivery cylinder. The method improves the hardness of the surface of the cylinder body by means of high-frequency induction hardening, making the difference in the hardness between the surface of the cylinder body and the chromium layer electroplated thereon small. Moreover, the thickness of the electroplated hard chromium layer is reduced, thereby decreasing the interlayer stress between the surface of the cylinder body and the chromium layer as well as the internal stress and fragility of the electroplated layer, in turn decreasing the cracking rate of the chromium layer on the surface of the delivery cylinder, reducing the risk of the hard chromium layer coming off and thus extending the service life of the delivery cylinder. In addition, this high-frequency induction hardening technique is highly efficient, is low cost, benefits industrial production, and is able to reduce the thickness of the hard chromium layer, thereby reducing the cost of the electroplating and benefitting the environment.

IPC Classes  ?

• F16J 10/04 - Running facesLiners
• C21D 1/10 - Surface hardening by direct application of electrical or wave energySurface hardening by particle radiation by electric induction
• C25D 3/04 - ElectroplatingBaths therefor from solutions of chromium
• E04G 21/04 - Devices for both conveying and distributing

Abstract

A method for controlling a closed type hydraulic system is disclosed. The closed type hydraulic system comprises multiple closed type hydraulic pressure subsystems (100) driven by a common driving source, wherein each closed type hydraulic pressure subsystem comprises a variable displacement pump (1), an actuator (2) and an oil-feeding loop (3). The control method comprises: judging whether each closed type hydraulic pressure subsystem (100) is in a working state or not, and unloading the oil-feeding loop of each closed type hydraulic pressure subsystem (100) in a non-working state. A closed type hydraulic system is also disclosed, which also comprises a controller, and the oil-feeding loop (3) of each closed type hydraulic pressure subsystem (100) is connected with an unloading oil way; the controller is used for judging whether each closed type hydraulic pressure subsystem (100) is in a working state or not, and the unloading oil way of the oil-feeding loop (3) of each closed type subsystem (100) in a non-working state is conducted. The oil-feeding loop of each closed type subsystem in a non-working state is unloaded, thereby greatly reducing unnecessary power loss of the whole closed type hydraulic system and reducing the thermal value.

IPC Classes  ?

• F15B 21/00 - Common features of fluid actuator systemsFluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
• F15B 21/14 - Energy-recuperation means

Abstract

A control system (300) for a concrete pump truck comprising: a signal processing unit (301) which acquires signals about vibration and gestures of the arm system in real time, optimises the signals about vibration and gesture, and outputs the optimised signals about vibration and gesture to a frequency identifying unit (302); the frequency identifying unit (302) calculates the current, actual pumping frequency, obtains the inherent frequency of the arm system according to the optimised signals about vibration and gesture, and sends the current, actual pumping frequency and the inherent frequency to a pumping frequency calculating unit (303); the pumping frequency calculating unit (303) compares the current, actual pumping frequency and the inherent frequency received from the frequency identifying unit (302) and sets an expected pumping frequency according to the results of the comparison. Aiming to solve the defect of the inability of current pumping control systems to adjust the pumping frequency without changing the pumping speed, the technical solutions are a control system and a control method which can adjust the pumping frequency in real time while maintaining the pumping speed unchanged.

IPC Classes  ?

• F04B 49/06 - Control using electricity
• E04G 21/02 - Conveying or working-up concrete or similar masses able to be heaped or cast
• B60P 3/16 - Vehicles adapted to transport, to carry or to comprise special loads or objects for carrying mixed concrete, e.g. having rotatable drums

Abstract

Disclosed is a material agitating and heating device. The material agitating and heating device comprises an agitating pan (1), an agitating shaft (2) installed inside the agitating pan (1), a drive device (3), and a heating source. The agitating shaft (2) has agitating paddles (21) and is driven by the drive device (3). An axial channel (22) is provided inside the agitating shaft (2), and the axial channel (22) communicates with the heating source. Further disclosed is asphalt agitating equipment, and the asphalt agitating equipment comprises the material agitating and heating device. As the axial channel communicating with the heating source is provided inside the agitating shaft of the agitating and heating device, the material is uniformly heated while being agitated, thermal loss is low, the heating efficiency is high, the design is reasonable, the structure is simple, and the practical applicability of the asphalt agitating equipment is effectively enhanced.

IPC Classes  ?

• E01C 19/10 - Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resinsApparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
• B28C 5/08 - Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing

Abstract

Disclosed is an operating method of a belt conveyor (10). The belt conveyor (10) comprises a conveying belt (1) and a plurality of drive motors (2). When the belt conveyor (10) is operated, different numbers of drive motors are started according to the material load on the conveying belt (1). The operating method reduces energy consumption and has strong industrial applicability.

IPC Classes  ?

• B65G 43/08 - Control devices operated by article or material being fed, conveyed, or discharged
• B65G 23/36 - Driving gear for endless conveyorsBelt- or chain-tensioning arrangements for effecting drive at two or more points spaced along the length of the conveyors comprising two or more driving motors each coupled to a separate driving element, e.g. at either end of the conveyors

Abstract

Disclosed is a control method for the telescoping of a boom. The method comprises: when the boom is performing a telescoping action, determining, on the basis of an acquired current ambient temperature and a prestored first corresponding relation, a nominal current required by the telescoping action when operating steadily, then inputting the nominal current to a telescoping proportional valve, where the first corresponding relation is the first corresponding relation between the ambient temperature and the nominal current required by the telescoping action of the boom when operating steadily; when the boom is in the process of performing the telescoping action, determining the actual telescoping speed of a telescoping oil cylinder, and adjusting the current input to the telescoping proportional valve on the basis of a difference acquired by subtracting the actual telescoping speed from a preset telescoping speed of the oil cylinder. The method allows for improved positioning accuracy of telescoping at low-speed segments, thus improving the completion rate of automatic telescoping of the boom of a crane. Also disclosed are a control apparatus for the telescoping of the boom and engineering machinery having the control apparatus.

IPC Classes  ?

• B66C 13/18 - Control systems or devices
• B66C 23/687 - Jibs telescopic

Abstract

An unloading device of a discharge port comprises a mixing mechanism (2) mounted below the discharge port (1). Asphalt mixing equipment comprises a first discharge port (11). The unloading device of the discharge port is disposed on the first discharge port (11). The unloading device of the discharge port (1) is provided with the mixing mechanism (2). The mixing mechanism (2) is capable of mixing aggregates falling from the discharge port (1) again, thereby effectively avoiding the aggregate separation phenomenon. Therefore, the unloading device is reasonably designed, avoids the aggregate separation phenomenon in the unloading process of the discharge port (1), and improves the practicability of the asphalt mixing equipment.

IPC Classes  ?

• E01C 19/10 - Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resinsApparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
• B28C 5/14 - Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials the stirrers having motion about a horizontal or substantially horizontal axis
• B28C 9/00 - General arrangement or layout of plant

Abstract

Provided are a mechanical arm, engineering machinery, and a method for determining the position of an arm section of the mechanical arm. The mechanical arm comprises: slope angle sensors (25, 26) mounted on the arm sections of the mechanical arm, the slope angle sensors being used to detect the slope angles of the arm sections (21, 22) at the slope angle sensors and being mounted in the regions of the arm sections having the maximum flexivity deformation(DE, BF). The mechanical arm solves the problem of insufficient accuracy and high costs in detecting the slope angle of the arm sections of a mechanical arm in the prior art, and is therefore capable of obtaining the position of the arm sections of the mechanical arm accurately and at low cost.

IPC Classes  ?

• B25J 13/00 - Controls for manipulators
• B25J 19/00 - Accessories fitted to manipulators, e.g. for monitoring, for viewingSafety devices combined with or specially adapted for use in connection with manipulators

Abstract

A counterweight balancing mechanism for two arms of a crane. The counterweight balancing mechanism comprises a counterweight base (1) and a single-stage balancing beam (2). A middle connection point of the single-stage balancing beam (2) is hinged to the counterweight base (1); two side connection points evenly distributed relative to the middle connection point are hinged respectively to two arms of the crane. By using the technical solution, the counterweight balancing mechanism is allowed to transmit a counterweight force to the arms, all connecting pieces between the counterweight base and the two arms of the crane are allowed to be hinged therebetween via a hinge point having only one rotational degree of freedom, and, when forces exerted onto the two arms are unbalanced, the connecting pieces are allowed to rotate relative to and around the hinge point until the forces exerted onto the two arms are balanced, thus allowing for the effect of automatic adjustment for force balancing.

IPC Classes  ?

• B66C 23/72 - Counterweights or supports for balancing lifting couples

Abstract

A control method of a steering central shaft and a hydraulic control system. The control method comprises: controlling a steering angle of a steering central shaft (50) to zero when a vehicle is in a normal traveling mode; controlling the steering angle of the steering central shaft to a target steering angle when the vehicle is in a crab steering mode or an anti-deflection traveling mode, the target steering angle being determined according to a steering angle of a first steering shaft (70) of the vehicle. The hydraulic control system comprises: a hydraulic oil supply device (10), and a steering electromagnetic valve (21), connected to power-assisted steering cylinders (31, 32) of a steering central shaft; and a controller (40), used for controlling the steering electromagnetic valve so that a steering angle of the steering central shaft reaches a target steering angle. The control method is convenient to operate, and can satisfy the working condition features of a high stable precision requirement and a low dynamic precision requirement. The control system has a simple structure, has a low requirement for cleanness, is safe and reliable, and requires low cost.

IPC Classes  ?

• B62D 5/06 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
• B62D 6/00 - Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits

Abstract

Disclosed are a road-sweeping equipment suction nozzle and road-sweeping equipment. The road-sweeping equipment suction nozzle comprises: a connecting bar mechanism (51) connected to a chassis (1) comprised in the road-sweeping equipment; a suction nozzle apparatus (52) connected by means of a pin shaft (53) to the connecting bar mechanism (51); a suction nozzle hoisting apparatus (54) connected to the connecting bar mechanism (51) and for controlling the lifting angle of the connected suction nozzle apparatus (52) around the pin shaft (53); and rear wheels (55) connected to the connecting bar mechanism (51) and moving under the traction of the connecting bar mechanism (51). The road-sweeping equipment suction nozzle can be adapted to the suction requirements of objects to be suctioned of different sizes.

IPC Classes  ?

• E01H 1/08 - Pneumatically dislodging or taking-up undesirable matterDrying by heat only, or by streams of gasCleaning by projecting abrasive particles

Abstract

Disclosed in the present invention is a sealing structure, which comprises an oil seal seat (2), a rotating shaft (3) and an oil seal (1) provided with a dynamic sealing part (11) and a static sealing part (12). The static sealing part of the oil seal is sleeved on the end (21) of the oil seal seat, the dynamic sealing part of the oil seal is sleeved on the rotating shaft, and the end of the oil seal seat is nested between the static sealing part of the oil seal and the rotating shaft. The sealing structure can be mounted in small installation space and structure, thus the sealing problem in small space is solved.

IPC Classes  ?

• F16J 15/32 - Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings

Abstract

Disclosed are an oil cylinder luffing jib, a linear speed control method and apparatus therefor. The linear speed control method for the oil cylinder luffing jib comprises: detecting the elevation angle of the jib, the trend of change in the elevation angle, and the length of the jib; acquiring the maximum linear speed of the jib; calculating a first output current of an oil cylinder proportional valve on the basis of the elevation angle of the jib, of the trend of change in the elevation angle, of the length of the jib, and of the maximum linear speed of the jib; and using the first output current to control the linear speed of the jib. The control method allows for automatic control of the linear speed of the oil cylinder jib.

IPC Classes  ?

• B66C 13/18 - Control systems or devices

Abstract

Disclosed in the present invention are a compression waste lorry, the method, device and system of controlling the position of the sliding plate of the same, which are used for solving the problem of working efficiency and reliability of a compression waste lorry in the prior art caused by imprecise detection of whether the action of the sliding plate of the compression waste lorry reaches the designated position. The method comprises: detecting whether a position detection signal about that at least one of left and right sides of the sliding plate of the compression waste lorry reaches the designated position is received within a predetermined time (S104); determining that the action of the sliding plate of the compression waste lorry reaches the designated position and outputting a trigger signal of the next action of the sliding plate by receiving the position detection signal about that at least one of left and right sides of the sliding plate of the compression waste lorry reaches the designated position (S108). Adopting the technical solutions of the method, device and system enables improving working efficiency and reliability of the compression waste lorry, avoiding disadvantage caused by uncertainty of detection of action-reaching-position signal of the sliding plate due to mechanism deformation or waste deflection loading of the sliding plate.

IPC Classes  ?

• B65F 3/14 - Vehicles particularly adapted for collecting refuse with devices for charging, distributing, or compressing refuse in the interior of the tank of a refuse vehicle

Abstract

A lighting vehicle, comprising a vehicle body, an arm structure and lighting assembly (30) installed on the vehicle body, wherein the arm structure comprises at least two sections of arm which are connected in succession and pivotable with respect to each other. The arm structure also comprises an end section of arm (10) connected pivotably to the last section of arm from the at least two sections of arm. The lighting assembly (30) is installed on the end section of arm (10). The lighting vehicle makes full use of the lengths of the at least two sections of arm to lift the lighting assembly installed on the end section of arm, and is capable of adjusting the angle of the lighting assembly by pivoting the end section of arm with respect to the arm connected thereto, thereby carrying out the necessary angle adjustment while ensuring the lift height.

IPC Classes  ?

• B60P 3/18 - Vehicles adapted to transport, to carry or to comprise special loads or objects the object being a searchlight
• F21V 21/26 - Pivoted arms
• F21L 14/04 - Electric lighting devices without a self-contained power source, e.g. for mains connection carried on wheeled supports

Abstract

Disclosed is a gate-type concrete pump and a pumping control system therefor. The pumping control system for the gate-type concrete pump comprises a gate control system (10) and a main hydraulic cylinder control system (20), the gate control system (10) comprising a gate and hydraulic cylinder in driving connection with the gate and controlling said gate, and also comprises a position switch (13), with the position switch (13) being provided in the projecting direction of the gate-controlling hydraulic cylinder, so as to detect the position of the gate when closed, and to output a signal to the main hydraulic cylinder control system (20). The pumping control system for the gate-type concrete pump is able to ensure that the pumping starts only after the gate valve is lowered into position and closed tightly, preventing liquid from flowing back into the hopper due to the segregation of concrete, and thus avoiding the occurrence of pipe blocking.

IPC Classes  ?

• F15B 11/00 - Servomotor systems without provision for follow-up action
• F04B 15/02 - Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous

Abstract

Disclosed are a control method and system for the butt-joint of a paving machine and a dump truck, the method including: (a) stopping the dump truck (20) in neutral in front of the paving machine (10) and inclining the truck hopper of the dump truck (20); (b) detecting in real time an initial speed of the paving machine (10); (c) when the initial speed is higher than a first speed, slowing down the paving machine (10) and contacting and butt-jointing to the dump truck (20) at a second speed, with the second speed being lower than or equal to the first speed. The system corresponds to the method, and controls the steps of the method, enabling the paving machine (10) and the dump truck (20) to be contacted and butt-jointed smoothly.

IPC Classes  ?

• E01C 19/12 - Machines, tools, or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for distributing granular or liquid materials
• B60W 40/10 - Estimation or calculation of driving parameters for road vehicle drive control systems not related to the control of a particular sub-unit related to vehicle motion

Abstract

Disclosed in the present invention is a connecting structure of the functional component of the driving cylinder. The functional component is provided with a cylinder bottom part (1), a cylinder barrel (2) and a guide sleeve (3). The cylinder barrel (2) comprises a first region which is connected with the cylinder bottom part (1) at the first end of the cylinder barrel and a second region which is connected with the guide sleeve (3) at the second end of the cylinder barrel; the cylinder barrel is provided with a plurality of first connecting holes and a plurality of second connecting holes respectively in the first and second regions; the cylinder bottom part (1) is provided with a plurality of third connecting holes corresponding to the first connecting holes, and the guide sleeve (3) is provided with a plurality of fourth connecting holes corresponding to the second connecting holes; first fixing parts (4) are arranged through the first connecting holes and the third connecting holes, and second fixing parts (5) are arranged through the second connecting holes and the fourth connecting holes. The first fixing parts (4) and the second fixing parts (5) are radially arranged so as to solve the connecting problem between the cylinder barrel (2) and the cylinder bottom part (1) and the connecting problem between the cylinder barrel (2) and the guide sleeve (3). The structure is simple and convenient to disassemble.

IPC Classes  ?

• F16B 12/30 - Jointing of furniture or the like, e.g. hidden from exterior using pegs, bolts, tenons, clamps, clips, or the like for metal furniture parts using threaded bolts
• F16J 10/00 - Engine or like cylindersFeatures of hollow, e.g. cylindrical, bodies in general

Abstract

A method for monitoring shaft-bonding of a drilling shaft of a drilling rig. A drilling rig comprises multiple drilling shafts, a power head (2) for pressurizing the drilling shafts, and a pressurizing device (1) for pressurizing the power head. The drilling shafts are numbered from 1 to i from outside to inside, where i=2, 3, …, N. The shaft-bonding monitoring method comprises: detecting to determine that a raised drilling shaft is the No. i drilling shaft, and detecting to determine that an actual pulling force of the pressurizing device (1) at the moment is fi; comparing the actual pulling force fi with a preset rated pulling force Fi of the No. i drilling shaft, and when the actual pulling force fi is smaller than the rated pulling force Fi, determining that shaft-bonding is incurred to the No. i drilling shaft. Also provided are a controller capable of implementing the monitoring method, a monitoring system, and a drilling rig having the monitoring system. The detecting of the actual pulling force of the pressurizing device undergoes a small amount of outside interference, so that the measurement result is accurate.

IPC Classes  ?

• E21B 17/10 - Wear protectorsCentralising devices

Abstract

A power control system and a power control method for an air-assisted sprayer and a gardening spray truck comprising the control system. The system comprises: a water pump frequency converter (12), disposed on a power supply circuitry of a spray water pump motor (2) of an air-assisted sprayer, and used for, according to set information about a working power supply frequency of the spray water pump motor (2), adjusting the working power supply frequency of the spray water pump motor (2); a main controller (11), connected to the water pump frequency converter (12), and used for receiving the set information about the working power supply frequency of the spray water pump motor (2), and sending the set information about the working power supply frequency of the spray water pump motor (2) to the water pump frequency converter (12). By adopting the technical solutions of the present invention, the objective of precisely adjusting the spray amount of the air-assisted sprayer is achieved, so as to facilitate energy conservation and consumption reduction.

IPC Classes  ?

• B05B 12/00 - Arrangements for controlling deliveryArrangements for controlling the spray area

Abstract

Disclosed is a sprocket shaft mounting structure for a hoist, wherein two ends of a sprocket shaft (1) are respectively mounted on a housing (3) of the hoist by means of bearings (2); a sprocket (8) is mounted on the sprocket shaft (1); impellers (4) are mounted respectively on the two ends of the sprocket (8), the impellers (4) being located inside the housing (3); and a vortex generated by the impellers (4) flows towards the sprocket (8). A hoist having the sprocket shaft mounting structure is also disclosed. During operation of the hoist, the vortex generated by the rotation of the impellers (4) will transport materials towards the sprocket (8), such that the materials are concentrated in the central position occupied by the sprocket (8), and the materials will not flow towards the inner walls of the housing (3), will not spill out of the housing (3), and will not cause abrasion to the sprocket shaft (1) or the bearings (2).

IPC Classes  ?

• B65G 23/06 - Drums, rollers, or wheels with projections engaging abutments on belts or chains, e.g. sprocket wheels

Abstract

Disclosed is a control system for a variable displacement pump, which system comprises a variable displacement pump control mechanism (1), an oil outlet pipeline (11) of which variable displacement pump control mechanism is in communication with a pressure control port (21A) of a displacement control device (21) of the variable displacement pump (2), wherein the variable displacement pump control system also comprises a pressure limiting branch (3) bypassing from the oil outlet pipeline, and the pressure limiting branch is activated when the pressure in an oil supply pipeline (22) of the variable displacement pump is greater than or equal to a predefined value; and the pressure limiting branch is deactivated when the pressure is less than the predefined value. Also disclosed is hydraulic travelling equipment, comprising a travel motor (5) and a variable displacement pump (2) driving the travel motor (5), the variable displacement pump being controlled via the abovementioned control system for a variable displacement pump. The variable displacement pump control mechanism in the variable displacement pump control system is easy to operate, and, when used for driving hydraulic travelling equipment, does not tend to damage the engine due to incorrect operation by a driver.

IPC Classes  ?

• F15B 11/048 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the speed depending on the position of the working member with deceleration control
• F15B 15/18 - Combined units comprising both motor and pump
• F04B 49/24 - Bypassing

Abstract

An arm support sensing device comprises a sensing switch (14) and a floating mechanism with the sensing switch being installed along the down-press direction of an arm support in a floating way. The floating mechanism comprises an installation seat (11) fixedly connected to an arm support bracket (4); a floating component (13) movably connected to the installation seat, the sensing switch being connected with the floating component in a synchronous movement way; and an elastic element (15) arranged between the installation seat and the floating component, so that the sensing switch has a trend of moving towards the arm support. In the arm support sensing device, the introduction of the floating mechanism avoids accidental damage incurred by floatation of the arm support to the sensing switch.

IPC Classes  ?

• B60P 1/48 - Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading using pivoted arms raisable above the load supporting or containing element

Abstract

Disclosed in the present invention is a protecting method for a rotary drilling rig; the rotary drilling rig includes a drilling pipe (5) and a main pump (1) for driving the drilling pipe (5) into rotation, wherein the protecting method includes detecting a depth of the drilling pipe (5) and a first output pressure of a main pump (1); determining a first upper limit value according to the value of the depth, comparing the value of the first output pressure with the first upper limit value, and lowering the first output pressure of the main pump (1) when the value of the first output pressure is larger than the first upper limit value. Also provided in the present invention are a controller to perform the above mentioned protecting method, a protecting system and a rotary drilling rig. By means of detecting and performing feedback of the output pressure value of the main pump, the above mentioned technical solution reduces the output of the main pump and lowers the actual torque when the actual torque borne by the drilling pipe is larger than the maximum torque sustainable thereby, thus preventing deformation of the drilling pipe.

IPC Classes  ?

• E21B 44/00 - Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systemsSystems specially adapted for monitoring a plurality of drilling variables or conditions
• E21B 3/02 - Surface drives for rotary drilling

Abstract

Disclosed in the present invention is a locking mechanism for locking a first object (5) and a second object (6) together, which incomprises a locking hook (1) and a driving mechanism (4). The first object is provided with a first chute (21), to which the locking hook is connected. When the locking mechanism is driven to the rearmost end of the first chute by the driving mechanism, the locking mechanism is locked and the first and the second object are locked together. When the locking mechanism is driven to the most front end of the first chute by the driving mechanism, the locking mechanism is unlocked and the first and the second object are released. Also disclosed is a garbage tank comprising the locking mechanism for locking a door onto the tank. Also disclosed is a garbage transfer station comprising the locking mechanism for locking a garbage compressor and the garbage tank together. As the position of the locking hook of the locking mechanism is adjustable relative to the first object, the first and the second object are effectively locked together.

IPC Classes  ?

• B65D 90/00 - Component parts, details or accessories for large containers

Abstract

An anti-rollover control method, device and system and engineering machinery, for solving the problem in the prior art of engineering machinery rollover accidents occurring when the ground is unstable or an object being lifted is too heavy. The method comprises: receiving the inclination angle detection signal of the engineering machinery; transforming the inclination angle detection signal into a deviation angle value; if the deviation angle value is greater than a preset maximum deviation angle threshold, then outputting an action command to stop increasing the deviation angle value; and if the deviation angle value is smaller than the preset minimum deviation angle threshold, then outputting an action command to stop decreasing the deviation angle value. The technical solution of the present invention improves the safety and reliability of engineering machinery.

IPC Classes  ?

• B66C 23/88 - Safety gear

Abstract

An alloy steel for casting a crawler plate comprises the following ingredients by weight percent: 0.3-0.37% of C, 0.75-1.05% of Mn, 0.30-0.65% of Si, 0-0.02% of S, 0-0.02% of P, 0.50-1.10% of Ni, 0.70-0.90% of Cr, 0.40-0.60% of Mo, 0.02-0.05% of Al, 0-0.02% of Cu, 0-0.01% of B, and 95.21-97.03% of Fe. Also disclosed are a crawler plate manufacturing method by using the alloy steel, crawler plate manufactured with the method, and engineering machinery. By using the crawler plate cast with alloy steel comprising the alloy elements such as Ni, Cr, Mo and the like, the present invention can improve the strength and rigidity of the crawler plate. Furthermore, by hardening and tempering the crawler plate and quenching a wheel travel surface, the present invention can further improve the overall strength and surface abrasion resistance, thus ensuring a pin lug to have enough strength to withstand extrusion, stretching and impact.

IPC Classes  ?

• C22C 38/42 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C21D 1/18 - HardeningQuenching with or without subsequent tempering
• B62D 55/18 - Tracks

Abstract

Disclosed are a crane and stabilizer control system and control method thereof, the control system comprising a controller (20), a switch control device (10) and a sensor (30); the switch control device (10) is connected to the controller (20) to receive a control signal inputted by an operator; the sensor (30) is connected to the controller (20) to detect the extension and retraction state of each crane stabilizer; and the controller (20) controls the extension and retraction of each stabilizer according to the control signal, and also controls the sensor (30) to detect and judge whether each stabilizer extends and retracts properly according to the detection result. The control system and control method achieve a better crane stabilizer control effect.

IPC Classes  ?

• B66C 23/78 - Supports, e.g. outriggers, for mobile cranes

Abstract

Disclosed is a stability control method for pumping trucks. The method includes obtaining a natural frequency of the pumping truck; and changing the displacement of a piston in a pumping oil cylinder of the pump truck so as to make the pumping frequency of the pumping truck unequal to the natural frequency. Also disclosed are a stability control device and system for pumping trucks and a pumping truck having the system. By means of adjusting the displacement of the piston in the pumping oil cylinder to change the pumping frequency so as to avoid resonance, it is not required to add additional excitation sources to the current concrete pumping truck, resulting in low cost, the capability to be transplanted quickly onto the existing concrete pumping trucks, good universality and convenience in use.

IPC Classes  ?

• F04D 29/66 - Combating cavitation, whirls, noise, vibration, or the likeBalancing
• F04D 27/02 - Surge control

Abstract

A bulk loading machine includes an outer hopper (2), an inner hopper (3), a connecting ring (5), a flexible sleeve (6) and a lower limit device of the inner hopper (3). The inner hopper (3) is provided within the outer hopper (2), the connecting ring (5) is fixed to the inner hopper (3) and provided on the upper of the outer hopper (2), and the connecting ring (5) is connected with the outer hopper (2) by the flexible sleeve (6), wherein the lower limit device includes a sensor (71) and a limit block (72), the limit block (72) is fixed on the outer wall of any one of the connecting ring (5) and the outer hopper (2), while the sensor (71) is fixed on the outer wall of the other one thereof. The lower limit device is easy to be installed and adjusted, by being mounted on the outer sides of the outer hopper and the connecting ring, and has good reliability against failure by means of a mutual touch between the sensor and the limit block.

IPC Classes  ?

• B65G 67/06 - Feeding articles or materials from bunkers or funnels
• B65G 67/60 - Loading or unloading ships
• B65G 67/00 - Loading or unloading vehicles

Abstract

Provided are concrete pumping equipment and a hydraulic system thereof, wherein the hydraulic system comprises: a first hydraulic subsystem comprising a first pump (5) and at least one first actuator (6), with a first multi-way reversing valve (1) being provided between the first pump (5) and the first actuator (6), the first multi-way reversing valve (1) comprising at least one first working position and at least one second working position; and a second hydraulic subsystem comprising a second pump (4) and at least one second actuator (7), the second pump (4) driving the at least one second actuator (7); the first pump (5) drives the at least one first actuator (6) via the first working position, and the first pump (5), together with the second pump (4), drives the at least one second actuator (7) via the second working position. By supplying the second hydraulic subsystem with pressure oil by means of the first pump (5), the present invention greatly improves the efficiency of the hydraulic system, increases the load rate of a motor of the concrete pumping equipment and reduces energy consumption on one hand, and improves the maximum pumping capacity of the concrete pumping equipment on the other hand.

IPC Classes  ?

• F15B 11/17 - Servomotor systems without provision for follow-up action with two or more servomotors using two or more pumps
• E02F 9/22 - Hydraulic or pneumatic drives

Abstract

Disclosed are a method, apparatus, and system for measuring the length of a boom oil cylinder. The method comprises: acquiring angle ∠FOG between the extending directions of the first boom and of the second boom; and calculating the length of line segment AB, which is the length of the boom oil cylinder, on the basis of angle ∠FOG, of the lengths of a first straight connecting rod and a second straight connecting rod, and of a connection relation between five elements, namely, the first straight connecting rod, the second straight connecting rod, the boom oil cylinder, the first boom, and the second boom. The technical solution allows for implementation of the measurement of the length of the boom oil cylinder by using only a rotary encoder and an inclination angle sensor. Compared with a line-pulling sensor, the rotary encoder or the inclination angle sensor has the advantages of convenient installation, durability, and great reliability.

IPC Classes  ?

• G01B 21/02 - Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness

Abstract

A method, apparatus, and system for use in controlling the position of a boom end of a boom apparatus. The boom apparatus comprises multi-segment booms (1a and 1b) connected to each other, while adjacent booms are provided therebetween with a boom oil cylinder (2). The method comprises: prior to controlling the boom end to move from a current position to a target position, calculating for each boom oil cylinder a current angle, a target angle, and a change in an angle of horizontal rotation; calculating a control current of each boom oil cylinder on the basis of this data and of a prestored control model of each boom oil cylinder; applying the control current calculated to the corresponding boom oil cylinder, continuing for a corresponding length of time, and controlling each boom to rotate horizontally to the change in the angle, thereby controlling the boom end to move from the current position to the target position. During the period when the current is applied, as the need for feeding back the inclination angle of the boom is obviated, and as the need for considering the posture of the boom is obviated, the method, apparatus, and system allow for precise control of the position of the boom end, thus providing great applicability and engineering practicability.

IPC Classes  ?

• E04G 21/04 - Devices for both conveying and distributing
• G05B 19/427 - Teaching successive positions by tracking the position of a joystick or handle to control the positioning servo of the tool head, leader-follower control

Abstract

Disclosed are a method and a device for measuring a lifting moment of a tower crane and a lifting moment monitoring system, in which the method includes: detecting a flexure displacement of an arched plate (20), the arched plate (20) being fixed in a main chord rod (10) of the tower crane; and calculating the lifting moment corresponding to the flexure displacement by means of a pre-established Neural Network model and the flexure displacement of the arched plate (20). By way of the above technical solution, the measuring of the lifting moment can be achieved by utilizing the arched plate (20) and a displacement sensor (30), thereby achieving the monitoring and controlling of the moment without adopting a device that is relatively high in price and involves complex installation for measuring the gravity and magnitude, thus it is small in volume, simple in structure, and low in cost and maintenance expenses, with a wide application range for tower cranes of various tonnages.

IPC Classes  ?

• B66C 23/88 - Safety gear

Abstract

Disclosed is a continuous transfer system and a feeding device thereof. The feeding device comprises a machine frame (3) and a hopper (2) arranged on the machine frame, wherein the machine frame is arranged bridging over a belt conveyor (11) of the continuous transfer system and is able to move along the conveying direction of the belt conveyor. The feeding device can move according to the change in the location where the material is being unloaded, so as to achieve the continuous operation of mining, improving the operating efficiency, lowering the cost of transferring, and avoiding at the same time dust pollution to the transportation route. Furthermore, the feeding device is of a reasonable structure, good reliability, and is especially suitable for continuous transferring operations at strip mine sites.

IPC Classes  ?

• B65G 47/20 - Arrangements or applications of hoppers or chutes the hoppers or chutes being movable
• B65G 47/18 - Arrangements or applications of hoppers or chutes
• B65G 47/52 - Devices for transferring articles or materials between conveyors, i.e. discharging or feeding devices
• B65G 47/44 - Arrangements or applications of hoppers or chutes
• B65G 15/00 - Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration

Abstract

Disclosed are a method for communicating with a PLC and an upper computer. The method includes: receiving a command of connecting a PLC; attempting to read PLC type identifier information inside the PLC using pre-stored communication protocols and/or communication parameters for various types of PLCs one by one, and after the reading is successful, determining the communication protocol and communication parameter of the PLC as the communication protocol and communication parameter employed when successfully reading the PLC type identifier; and communicating with the PLC using the determined communication protocol and communication parameter. The uniform encapsulation of the communication protocols and/or communication parameters of various types of PLCs can enable an upper computer to communication with most types of PLCs, improving the universality of the upper computer and the flexibility of PLC selection. In addition, the automatic identification of the communication protocols and/or communication parameters of various types of PLCs can remove the work of manually selecting a PLC type or communication parameter, improving communication efficiency.

IPC Classes  ?

• G05B 19/418 - Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]

Abstract

Disclosed is a staircase (10). The staircase (10) comprises footsteps (1) and stair beams (2) at two sides opposite each other. The stair beams (2) at two sides each comprise a plurality of stair beams (2a) arranged in parallel and at intervals. The footsteps (1) are horizontally arranged between the stair beams (2) at two sides. Each side of the footstep (1) is rotatably connected to the plurality of stair beams (2a) at the same side. The upper ends of the plurality of stair beams (2a) are pivotal ends and a plane where the plurality of stair beams (2a) is located is parallel to the footstep (1). Also disclosed is a driver's cab with the staircase. The footsteps of the staircase can be automatically adjusted and kept horizontal, and it is convenient for an operator to get on and off the driver's cab.

IPC Classes  ?

• E06C 5/02 - Ladders characterised by being mounted on undercarriages or vehiclesSecuring ladders on vehicles with rigid longitudinal members
• E06C 7/08 - Special construction of longitudinal members, or rungs or other treads
• E06C 7/18 - Devices for preventing persons from falling
• B60R 3/00 - Arrangements of steps, e.g. running-boards

Abstract

A crane comprising a front car (100), a rear car (200), and a connecting beam (300) connected between an upper car of the front car (100) and an upper car of the rear car (200). The front car (100) comprises a front car frame (101), a front turntable (103), a front center slewing bearing (104), and a peripheral bearing. The front center slewing bearing (104) is arranged between the front car frame (101) and the front turntable (103), thus allowing the front turntable (103) to rotate relative to the front car frame (101). The peripheral bearing is arranged between the front car frame (101) and the front turntable (103) and is arranged around the periphery of the front center slewing bearing (104). The front center slewing bearing and the peripheral bearing provide the upper car of the front car with a great supporting force and anti-rollover capability, thus allowing the crane provided in the present invention to be provided with improved operational stability and safety when performing heavy duty operations.

IPC Classes  ?

• B66C 23/84 - Slewing gear

Abstract

Provided are a method and a device for processing production process data information. The method comprises: collecting production process data information (S102); encrypting the production process data information to form encryption information (S104); converting the encryption information into a two-dimensional bar code (S106); and setting the two-dimensional bar code in a recording medium of the production process data information (S108). The method and device can improve the reliability of the recording medium of the production process data information.

IPC Classes  ?

• G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)

Abstract

Disclosed is a cut-off reversing device of concrete pumping equipment, comprising: a body (1) having a first sidewall (3), and a second sidewall (4) arranged opposite to the first sidewall (3), with a first opening (5) being provided in the first sidewall (3) and a second opening (6) being provided in the second sidewall (4); and a switching unit (2), the switching unit (2) having a plurality of switching channels (7). The body (1) further comprises a cavity (9), with the switching unit (2) being removably disposed in the cavity (9), and during switching of the switching unit (2), at least one port (8) of at least one switching channel (7) is operably exposed outside the body (1). Concrete pumping equipment provided with the cut-off reversing device can achieve the effect of real-time switching between double pumps/double pipes via the switching unit (2) so as to ensure continuous pumping, and requires no dissembling/assembling of pipes, thus improving efficiency during construction.

IPC Classes  ?

• F04B 15/02 - Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
• E04G 21/04 - Devices for both conveying and distributing

Abstract

An automobile steering control method comprising: when wheels of a front axle (51) turn, determining a turning angle of wheels of a rear axle (52) on the basis of the formula of Licot(αi)=Ljcot(αj) and the formula of Licot(βi)=Ljcot(βj), where αi and αj respectively represent the turning angles of outside wheels of the ith and of the jth axles of an automobile, βi and βj respectively represent the turning angles of inside wheels of the ith and of the jth axles of the automobile, the ith and the jth axles of the automobile respectively are arranged on two sides of a turning centerline, Li and Lj respectively represent the distances from the ith and the jth axles of the automobile to the turning centerline, and form a predetermined functional relationship with the current turning angle of a steering wheel of the automobile; transmitting information of the turning angle of the wheels of the rear axle (52) to a steering control system (60) of the automobile. Both the automobile steering control system and the automobile comprising the steering control system employ the control method, which allows for consideration to be given to both steering stability and navigability of the automobile.

IPC Classes  ?

• B62D 6/00 - Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
• B62D 113/00 - Position of parts of the steering mechanism, e.g. the steered wheels or the steering wheel
• B62D 137/00 - Conditions not specified in groups

Abstract

A multilayer supporting frame for storing suspension arms comprises at least four upright columns (10) and a bottom-layer suspension arm supporting plate (30) fixedly arranged between two neighboring upright columns (10) in the four upright columns (10), wherein, at least one layer of rotary suspension arm supporting plates (50) is rotatablely arranged above the bottom-layer suspension arm supporting plate. In the multilayer supporting frame for storing suspension arms according to the present invention, on the basis of the original single-layer supporting frame for storing suspension arms, at least one rotary suspension arm supporting plate layer is additionally arranged above the bottom-layer suspension arm supporting plate so that suspension arms can be stacked in space, thereby avoiding the problem of larger occupied space caused by single-layer stacking of the suspension arms, and facilitating management of the suspension arms while saving occupation area.

IPC Classes  ?

• B25H 3/04 - Racks

Abstract

Provided are a forklift auxiliary transportation device and truck-mounted pump assembly and forklift having same, the forklift auxiliary transportation device comprising two bearing beams disposed in parallel (10) having an accommodation space formed therebetween, and a reinforced crossbeam (20) fixedly disposed at the lower end of the two bearing beams (10) and connecting the two bearing beams (10). The forklift auxiliary transportation device of the present invention forms the accommodation space between the forklift and an object to be transported, avoids the direct contact of the forklift with the object to be transported, prevents interference between the forklift and the irregular shaped object to be transported, thus broadening the transportation scope of the forklift and improving the transportation efficiency of the irregular shape object to be transported.

IPC Classes  ?

• B65D 19/28 - Rigid pallets without side walls with bodies formed by uniting or interconnecting two or more components made wholly or mainly of metal
• B66F 9/12 - PlatformsForksOther load-supporting or load-gripping members
• B65G 7/00 - Devices for assisting manual moving or tilting heavy loads

Abstract

Provided are a material dropoff control system and method, aiming to solve the problem of low production efficiency in the prior art due to material dropoff through interconnection. The system comprises: a main controller provided with an input port, a communication interface, a first output port, a second output port, a first relay having the coil thereof connected to the first output port of the main controller, a material dropoff prompt unit connected to the output end of a normally open contact of the first relay and used to give an alarm, a display device connected to the communication interface of the main controller and used to display the necessary amount of dropoff material, and a weighing completion button connected to the input port of the main controller and used to transmit a weighing completion signal to the main controller; the second output port of the main controller is used to output a control signal to a material dropoff valve. The technical solution of the present invention improves production efficiency and material dropoff accuracy.

IPC Classes  ?

• B65G 43/08 - Control devices operated by article or material being fed, conveyed, or discharged

Abstract

Disclosed in the present invention are a speed control method, device, system for an electro-hydraulic proportional valve and engineering machinery with the same. The method comprises: obtaining the actual speed of a hydraulic execution element; when the difference between the actual speed and expected speed is larger than a predetermined value, adjusting the frequency and/or duty cycle of a PWM (pulse width modulation) signal provided to the electro-hydraulic proportional valve basing on the difference; calculating the frequency and/or amplitude of a shaking signal according to the frequency and/or duty cycle of the adjusted PWM signal, and adjusting the amplitude of the calculated shaking signal according to the rate of change of the difference between the actual speed and the expected speed; and, providing the adjusted shaking signal as well as the adjusted PWM signal to the electro-hydraulic proportional valve. The method enables providing a shaking signal that overcomes the static friction of a valve core of the electro-hydraulic proportional valve to the electro-hydraulic proportional valve, thus improving response speed and linearity of the electro-hydraulic proportional valve.

IPC Classes  ?

• F15B 11/04 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the speed

Abstract

A method for measuring the height of the center of mass of a tracked vehicle, comprising: arranging on one side of the tracked vehicle an image capturing device (1); driving the tracked vehicle along a straight line on an incline (2) having a protruding inflection point (A), acquiring by using the image capturing device a first image and a second image at moments of inflection at two instances when the tracked vehicle passes the inflection point; selecting from the first image a first vertical line passing through the inflection point, and selecting from the second image a second vertical line passing through the inflection point; comparing the first image with the second image to acquire a point of intersection (G) of the first vertical line and the second vertical line; from the point of intersection, calculating the height of the center of mass of the tracked vehicle on the basis of a proportional relationship between the images and the physical object. Also provided is a measuring apparatus utilizing the measuring method. The implementation of contactless measurement via the structurally simple measuring apparatus and the measuring method having simple operations allows for not only improved operational efficiency, but also for greatly improved precision.

IPC Classes  ?

• G01M 1/12 - Static balancingDetermining position of centre of gravity

Abstract

A method for measuring the height of the center of mass of an object and a measuring apparatus utilizing the measuring method. The measuring method comprises the following steps: (a) using a conveyor belt to form a first surface (11) and a second surface (12) intersecting at an inflection point (A); (b) while a bottom surface of the object is in contact with the conveyor belt and moves along with same, determining at a first moment of inflection a first vertical line (l1) passing through the inflection point, and determining at a second moment of inflection a second vertical line (l2) passing through the inflection point; and (c) acquiring a point of intersection (G), which is the center of mass, of the first vertical line (l1) and the second vertical line (l2).

IPC Classes  ?

• G01M 1/12 - Static balancingDetermining position of centre of gravity

Abstract

A multi-engine control method involves obtaining multi-engine control variables, calculating the rotating speed of each engine according to the control variables, and controlling each engine to rotate according to the rotating speed. Also disclosed are a multi-engine control device and machine. The multi-engine control method, device and machine can satisfy the need of the machine for ultra large power.

IPC Classes  ?

• F02D 25/00 - Controlling two or more co-operating engines
• B60K 5/08 - Arrangement or mounting of internal-combustion or jet-propulsion units comprising more than one engine

Abstract

Disclosed in the present invention is a road milling machine, which comprises a machine frame (1), a conveying belt mechanism (2) and a lifting oil cylinder (3). The said conveying belt mechanism (2), provided with an input end (25) and an output end (24) oppositely, is hinged with said machine frame (1) through a first pivot point (21). One end of said lifting oil cylinder (3) is hinged with said machine frame (1), the other end is hinged with said conveying belt machine (2) through a second pivot point (22). The said second pivot point (22) is located above said first pivot point (21). The said first pivot point (21) is located between said second pivot point (22) and the input end (25) of said conveying belt mechanism (2). When the first pivot point (21) is moved upward relative to the input end (25), based on the lever principle, the weight of the input end (25) will effectively reduce the load of the lifting oil cylinder (3), reduce the pressure of hydraulic oil in the cylinder, and reduce hydraulic oil leakage and the oil cylinder declining risk, thereby increasing security and reliability of the road milling machine.

IPC Classes  ?

• E01C 23/088 - Rotary tools, e.g. milling drums
• E01C 23/06 - Devices or arrangements for working the finished surfaceDevices for repairing the surface of damaged paving

Abstract

A kitchen garbage processing system is disclosed. The processing system includes a storage device (1, 2), a separating device (3, 7) and a collecting device (10) connected sequentially. The storage device is used for receiving and filtering kitchen garbage to obtain filtered mixture and conveying the filtered mixture to the separating device. The separating device is used for separating grease from the filtered mixture and conveying the grease to the collecting device. The collecting device is used for collecting the grease from the separating device. The system processes kitchen garbage by an individual separating device thus to separate grease from the kitchen garbage for recycle and storage. The processing efficiency of the system is high and the operating thereof is stable, and thus the system is suitable for large scale processing of kitchen garbage. The quality of the grease obtained by the system is high.

IPC Classes  ?

• C02F 9/10 - Thermal treatment
• C02F 1/10 - Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
• C02F 1/38 - Treatment of water, waste water, or sewage by centrifugal separation
• C02F 1/52 - Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities

Abstract

A harness protection device comprises a harness protection body (10) that has an internal passage for a harness to pass through and has at least one butt joint end (12) in butt joint with a protection pipe (40) sleeved outside a harness (20); a sealing component (11), disposed between the butt joint end (12) of the harness protection body (10) and the protection pipe (40) in a sealed manner. In the harness protection device provided in the present invention, the harness protection body that has a butt joint end and the seal component can form desirable dustproof and waterproof protection at terminals and branches of the harness, to prevent the equipment from failure due to damages to the harness, thereby improving the working efficiency and reducing the lost.

IPC Classes  ?

• H02G 3/06 - Joints for connecting lengths of protective tubing to each other or to casings, e.g. to distribution boxEnsuring electrical continuity in the joint
• F16J 15/00 - Sealings

Abstract

Disclosed in the present invention are a speed control method, device, system for an electro-hydraulic proportional valve and engineering machinery with the same. The method comprises: receiving the expected speed; comparing the expected speed with pre-stored actual speed to determine actual speed, wherein the difference between the actual speed and expected speed is within a predetermined range, and providing a PWM signal having the frequency and duty cycle corresponding to the actual speed and a shaking signal having the frequency and amplitude corresponding to the actual speed to the electro-hydraulic proportional valve. The method enables saving most or all of the steps for regulating PWM signals and shake signals according to the difference between the actual speed and the expected speed, thus improving response speed and linearity of the electro-hydraulic proportional valve.

IPC Classes  ?

• F15B 11/04 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the speed

Abstract

A method for measuring the height of the center of mass of an object and a measuring apparatus utilizing the measuring method. The measuring method comprises: arranging on one side of the object an image capturing device (1); using a conveyor belt to form an incline (2) having a protruding inflection point (A), where the object moves on the incline (2) along with the conveyor belt, and using the image capturing device (1) to acquire a first image and a second image at moments of inflection at two instances when the object passes the inflection point (A); selecting from the first image a first vertical line (l1) passing through the inflection point, and selecting from the second image a second vertical line (l2) passing through the inflection point; by comparison, acquiring a point of intersection (G) of the first vertical line (l1) and the second vertical line (l2); and, from the point of intersection (G), calculating the height of the center of mass of the object on the basis of a proportional relation between the images and physical object.

IPC Classes  ?

• G01M 1/12 - Static balancingDetermining position of centre of gravity

Abstract

An asphalt heating device and asphalt stirring equipment having the heating device. The asphalt heating device comprises an asphalt tank (1) and a heating tank (2). A first heater (25) is provided inside the heating tank, the asphalt tank (1) has an asphalt outlet (11), the heating tank (2) has an asphalt inlet (21) and an asphalt outlet (22), and the asphalt outlet (11) of the asphalt tank (1) communicates with the asphalt inlet (21) of the heating tank (2) through an oil supply pipeline (31). The asphalt heating device further comprises an asphalt pump (4) and a first return pipeline (32). The heating tank (2) further comprises an asphalt return port (23), the first return pipeline (32) enables the asphalt outlet (22) of the heating tank to communicate with the asphalt return port (23), and the asphalt pump (4) is serially connected to the first return pipeline (32). The asphalt heating device is capable of heating asphalt rapidly and evenly, the asphalt near the heating pipe of the heater is not easy to age, and the energy consumption is low.

IPC Classes  ?

• E01C 19/08 - Apparatus for transporting and melting asphalt, bitumen, tar, or the like

Abstract

Disclosed are a terminal management system, server and method. The method includes: receiving data from a terminal (1) via monitoring ports (210); determining a parsing protocol corresponding to the terminal type of the terminal (1) according to the port numbers of the monitoring ports (210) which receive the data and a pre-stored correlation between the port numbers of the plurality of monitoring ports (210) and the parsing protocol; and using the determined parsing protocol to parse the received data. By way of using the solution of the present invention, there is no need to make any hardware modifications on the existing terminals and servers, which is simple and practical, and of high compatibility, and can realize unified management of vehicles with various types of GPS vehicle-mounted terminals arranged therein, saving a large amount of cost.

IPC Classes  ?

• H04L 29/06 - Communication control; Communication processing characterised by a protocol

Abstract

Disclosed is an adjustable automatic assembling and disassembling device (100). A first connected member (200) is connected with a second connected member (300) by the adjustable automatic assembling and disassembling device. The adjustable automatic assembling and disassembling device comprises: an actuating system including a cylinder (131), a piston (133) and a supporting rod (135), in which, the supporting rod (135) passes through the first connected member (200) and the second connected member (300), and the supporting rod (135) is fixedly connected with the piston (133), and a first end of the cylinder (131) is pressed against the second connected member (300); an energy storage system including a spring assembly (121), in which, a first end of the spring assembly (121) is pressed against a second end of the cylinder (131); a limiting adjusting system connected with the supporting rod (135) including a first limiting adjusting portion, in which, the first limiting adjusting portion and the supporting rod (135) have a first position passing through out of the first connected member (200) and a second position pressed against the first connected member (200). It spends significantly less time assembling and disassembling two heavy components with the device, and the labor intensity is less.

IPC Classes  ?

• F16B 1/00 - Devices for securing together, or preventing relative movement between, constructional elements or machine parts
• F16B 1/04 - Means for securing elements of mechanisms after operation disengaged by movement of the actuating member of the element
• F16B 21/09 - Releasable fastening devices with a stud engaging a keyhole slot

Abstract

An ironing device and a spreading machine having same. The ironing device comprises a basic ironing plate (10) and a lengthened ironing plate (40) connected thereto, and further comprises a clamping mechanism (30). The clamping mechanism (30) comprises: a driving system comprising a cylinder body (331), a piston (333) and a supporting rod (335), the supporting rod (335) passing through the basic ironing plate (10) and the lengthened ironing plate (40), and a first end of the cylinder body (331) being pressed against the lengthened ironing plate (40); a power system comprising a pressure source communicated with the cylinder body (331); an energy storage system comprising a spring component (321), a first end of the spring component (321) being pressed against a second end of the cylinder body (331); and a limit adjustment system comprising a first limit adjustment portion, the first limit adjustment portion and the supporting rod (335) being provided with a first position passing through the basic ironing plate (10) and a second position pressed against the basic ironing plate (10). When the ironing plate is lengthened, the ironing device is easy to mount, and fastening pieces do not need to be screwed up manually, so that the labor intensity of operators is reduced, and the mounting speed of the lengthened ironing plate is increased.

IPC Classes  ?

• E01C 19/48 - Machines, tools, or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface

Abstract

Disclosed is a coupling device (30) for hydraulic elements, which coupling device (30) is used for connecting a first hydraulic element (10) having a first oil port (11) with a second hydraulic element (20) having a second oil port (21), wherein the coupling device (30) comprises at least three valve blocks communicated between the first oil port (11) and the second oil port (21), two of the at least three valve blocks abutting the first oil port (11) and the second oil port (12) respectively, and among the abutting surfaces between any two adjacent valve blocks of the at least three valve blocks, the abutting surfaces between the at least three valve blocks and the first oil port (11) and the abutting surfaces between the at least three valve blocks and the second oil port (21), three surfaces being perpendicular to each other. The coupling device can ensure a tight abutment between each of the valve blocks of the coupling device, so as to prevent oil leakage. Also disclosed are a hydraulic element set and engineering machinery.

IPC Classes  ?

• F15B 21/00 - Common features of fluid actuator systemsFluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
• F15B 13/08 - Assemblies of units, each for the control of a single servomotor only

Abstract

Disclosed is a method for detecting a hydraulic valve in a hydraulic circuit, which method comprises: obtaining an actual pressure difference value of hydraulic oil between an oil inlet of the hydraulic valve and an oil outlet thereof; obtaining an actual flow rate value of hydraulic oil at the oil outlet of the hydraulic valve; and comparing the actual pressure difference value and the actual flow value to a theoretical flow-pressure difference curve of the hydraulic valve, so as to determine whether there is a fault in the hydraulic valve. Also disclosed are a controller and a device for detecting a hydraulic valve in a hydraulic circuit, a method and a device for detecting a hydraulic circuit fault, and a fault processing system for a hydraulic circuit. Utilizing these technical solutions, it is possible to determine which hydraulic valve is faulty quickly and accurately, and to provide a processing solution, when a hydraulic valve in the hydraulic circuit is faulty.

IPC Classes  ?

• F15B 19/00 - Testing fluid-pressure actuator systems or apparatus, so far as not provided for elsewhere

Abstract

Provided in the present invention are a control method and control system for a rotation mechanism of an engineering machinery and the engineering machinery, for use in solving the problem of poor reliability in the prior art of using an RCV controller to control the rotation mechanism of a tower crane. The method comprises: a controller of the engineering machinery receiving a speed command signal, converting the speed command signal into a power control signal required by a power controller then transmitting to the power controller; the power controller converting the power control signal into a control signal of a power module then transmitting to the power module; and the power module controlling a torque motor of the rotation mechanism on the basis of the control signal transmitted by the power controller. Employment of the technical solution of the present invention allows for improved reliability in controlling the rotation mechanism of the tower crane.

IPC Classes  ?

• B66C 13/22 - Control systems or devices for electric drives

Abstract

Disclosed are a concrete pump truck and a hydraulic control system thereof. The hydraulic control system includes: a first hydraulic pump (11); a flow control assembly (2) of which an input end is connected with an oil outlet of the first hydraulic pump (11); an arm hydraulic subsystem (31) of which an oil inlet is connected with an output end of the flow control assembly (2); a support leg hydraulic subsystem (32) of which an oil inlet is connected with the output end of the flow control assembly (2). The hydraulic control system also includes a distribution hydraulic subsystem (33) and a stirring-cleaning-cooling hydraulic subsystem (34), wherein at least one oil inlet of the distribution hydraulic subsystem (33) and the stirring-cleaning-cooling hydraulic subsystem (34) is connected with the output end of the flow control assembly (2). The hydraulic control system has simpler structure, lower cost, lower fault rate and convenience of the unified allocation of power.

IPC Classes  ?

• F15B 11/16 - Servomotor systems without provision for follow-up action with two or more servomotors
• F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors

Abstract

Disclosed is a rotational connector, comprising a core body (10) and a housing (20) by which the core body is sheathed, the housing (20) being relatively movable with respect to the core body (10), with an annular groove formed between the core body (10) and the housing (20), the annular groove being in communication with the outside of the rotational connector via a first channel (21) in the housing (20) and a second channel (14) in the core body (10), wherein the annular groove comprises a first annular groove (11), a second annular groove (12) and a separation groove (13) provided between the first annular groove (11) and the second annular groove (12), the insulation groove (13) being in communication with the outside of the housing (20). An environmental sanitation vehicle comprises the abovementioned rotational connector. In the present invention, providing the separation groove (13) between the core body (10) and the housing (20) causes the liquid leaked from the first annular groove (11) or the second annular groove (12) to flow into the separation groove (13) so as to solve the problem that the liquid in the first annular groove (11) and the liquid in the second annular groove (12) flow into each other.

IPC Classes  ?

• E02F 9/00 - Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups
• E02F 9/22 - Hydraulic or pneumatic drives
• E02F 3/85 - Applications of hydraulic or pneumatic systems
• B66C 23/86 - Slewing gear hydraulically actuated
• H01R 39/00 - Rotary current collectors, distributors or interrupters
• H01R 39/08 - Slip-rings
• H01R 39/18 - Contacts for co-operation with commutator or slip-ring, e.g. contact brush

Abstract

A mounting structure for a distributing device, and a paving machine comprising the mounting structure for a distributing device. In the mounting structure for a distributing device, a mounting frame (20) cooperating with a paving machine rear upright plate (70) is mounted on both a distributing device driving device (11) and a helical blade support device (17). Either the mounting frame (20) or the paving machine rear upright plate (70) is provided with a longitudinal sliding groove (22) and the other is provided with a mounting hole (72) cooperating with the longitudinal sliding groove (22); and an automatic fastener (60) is mounted in the mounting hole (72) and the longitudinal sliding groove (22). The automatic fastener (60) has a clamping state in which the mounting frame (20) and the paving machine rear upright plate (70) are clamped, and an unclamped state in which the mounting frame (20) and the paving machine rear upright plate (70) are not clamped. A mounting frame driving device (90) for driving the mounting frame (20) such that it moves along the sliding groove (22) is also provided. The advantages of the mounting structure for the distributing device lie in a convenient and shortened process for adjusting the height of a distributing device and in a saving on time and power.

IPC Classes  ?

• E01C 19/12 - Machines, tools, or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for distributing granular or liquid materials
• E01C 19/48 - Machines, tools, or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface

Abstract

A tower crane and a lower support assembly thereof. The lower support assembly comprises: a lower support (10) with supporting legs (11) connected to standard knots; and side connecting members disposed on at least two opposite side surfaces of the lower support (10). The assembly further comprises: crossbeam transitional assemblies (20) detachably disposed on the side connecting members, climbing frame connecting members (21) connected to climbing frames being disposed on lower surfaces of the crossbeam transitional assemblies (20). In the lower support assembly, each part can be processed individually and is convenient for conversion operations, so that the dimension and processing precision can be easily guaranteed. Besides, the assembly can be disassembled in the process of transportation, which saves space and reduces the freight.

IPC Classes  ?

• B66C 23/78 - Supports, e.g. outriggers, for mobile cranes
• B66C 23/16 - Cranes comprising essentially a beam, boom or triangular structure acting as a cantilever and mounted for translatory or swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib cranes, derricks or tower cranes with jibs supported by columns, e.g. towers having their lower end mounted for slewing movements

Abstract

A brake valve assembly comprises an accumulator (52) for storing oil, a pressure detector for detecting pressure of the oil in the accumulator, a liquid charging valve (40a, 40b) arranged on a liquid charging oil passage of the accumulator for charging liquid into the accumulator (52), a one-way valve (42) for locking oil in the liquid charging oil passage (62) so as to prevent an oil backflow, and a working valve (50a, 50b, 50c, 50d) arranged on a working oil passage of the accumulator (52) for controlling the oil in the accumulator (52) to be released. The brake valve assembly has two independent oil passages, i.e. the charging oil passage (62) of the accumulator (52) and the working oil passage (68) of a brake (14). A hydraulic system has the brake valve assembly. A typical operation machine, i.e. a tower type concrete distributor has the hydraulic system. The brake valve assembly can be used for braking, clamping, pressure keeping, and the like.

IPC Classes  ?

• F15B 1/033 - Installations or systems with accumulators having accumulator charging devices with electrical control means
• F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
• F15B 11/02 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member

Abstract

Disclosed is a method for welding an axle housing to an axle tube, comprising: (a) processing a welding end face (1a) of the axle housing (1) and a welding end face (2a) of the axle tube (2) respectively such that the welding end face of the axle housing and the welding end face of the axle tube mate with each other and are not perpendicular to the axial direction of the axle tube; and (b) aligning and welding the welding end face of the axle tube with the welding end face of the axle housing. Also provided is a structure for connecting an axle housing to an axle tube, which connecting structure comprises an axle housing and an axle tube which are connected by welding, wherein the welding end face of the axle housing and the welding end face of the axle tube are mated with each other and are not perpendicular to the axial direction of the axle tube. Since the welding end faces of the axle housing and of the axle tube are not perpendicular to the axial direction, stress can be distributed on a plurality of cross sections perpendicular to the axial direction, thus dispersing the stress concentration at the welding location and effectively improving the overall fatigue strength of the axle housing and axle tube assembly.

IPC Classes  ?

• B23K 33/00 - Specially-profiled edge portions of workpieces for making soldering or welding connectionsFilling the seams formed thereby
• B23K 31/02 - Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups relating to soldering or welding

Abstract

An inclination angle measuring device, method, and processor. The measuring device comprises: a shaft (10); a weight (20), the weight (20) being connected to the shaft (10) and driving the shaft (10) to rotate around the axis of the shaft (10) when the inclination angle of an object to be measured changes; a sensor (30), used for detecting the angle or the arc length by which the shaft (10) rotates around the axis of the shaft (10); and a processor (40), connected to the sensor (30) and used for receiving the angle or the arc length and calculating the inclination angle according to the angle or the arc length. The device uses purely mechanical elements to perform inclination angle measurement, so as to solve the problem that a micro-mechanical sensing element has a great temperature drift and even fails to function above 85°C. Further, the inclination angle is calculated according to a linear formula, thereby avoiding the nonlinear problem of the micro-mechanical sensing element and improving the measurement accuracy.

IPC Classes  ?

• G01C 9/00 - Measuring inclination, e.g. by clinometers, by levels
• G01C 9/10 - Measuring inclination, e.g. by clinometers, by levels by using rolling bodies
• G01C 9/12 - Measuring inclination, e.g. by clinometers, by levels by using a single pendulum
• G01C 9/14 - Measuring inclination, e.g. by clinometers, by levels by using a single pendulum movable in more than one direction
• G01C 15/10 - Plumb lines

Abstract

Disclosed are a hydraulic oil flow distribution method and a device thereof for hydraulic system. The hydraulic system includes multiple oil passages and an oil pump from which hydraulic oil is supplied to the multiple oil passages. The method includes the following steps of: calculating the hydraulic oil flow supplied by the oil pump by a first hydraulic oil flow calculating device (10), calculating the hydraulic oil flow required for the multiple oil passages by a second hydraulic oil flow calculating device (20), and calculating the ratio between the supplied hydraulic oil flow and the required hydraulic oil flow when the hydraulic oil flow supplied by the oil pump is less than the hydraulic oil flow required for the multiple oil passages, and regarding to each of the multiple oil passages, supplying the hydraulic oil flow which is the product of the oil flow required for the oil passages and the ratio to the passage. By proportionally distributing the hydraulic oil flow to each oil passage, the hydraulic oil flow distributed by the system to each oil passage reduces accordingly. Therefore, though the action of the actuation component corresponding to each oil passage is slow, it is able to coordinate action and complete composite motion.

IPC Classes  ?

• F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
• F15B 11/16 - Servomotor systems without provision for follow-up action with two or more servomotors
• E02F 9/22 - Hydraulic or pneumatic drives

Abstract

Disclosed are a foldable boom structure and a folding and unfolding method thereof. The foldable boom structure comprises a main arm (10), a strut mechanism (20) and a secondary arm (30) mounted on the main arm, and a steel rope (40) wound by a winch and supported by the strut mechanism. The secondary arm comprises a secondary arm front segment (31) and a secondary arm rear segment (32) pivotably connected with each other. An end of the steel rope is connected to the secondary arm in a dismountable manner. The foldable boom structure further comprises a pulling plate (50). The pulling plate at least comprises a dismountable first part (51) and second part (52) that are pivotably connected with each other. The first part and the second part are respectively connected to the secondary arm front segment and the strut mechanism. By means of the foregoing technical solution, the secondary arm may be folded or unfolded through the pulling plate and the steel rope, thereby improving the lifting performance and reducing the requirement on the strength of the steel rope. In addition, auxiliary devices such as an auxiliary crane are no longer required, and dangerous operations are no longer required to be performed manually.

IPC Classes  ?

• B66C 23/68 - Jibs foldable or otherwise adjustable in configuration

Abstract

Disclosed are a gantry bucket-wheel stacker-reclaimer and an adjusting method and an adjusting device for a balance wheel thereof. The stacker-reclaimer comprises: a balance wheel (41), a first cylinder (21), a second cylinder (22), a first lifting rope (31), a second lifting rope (32), a limit striker (8), a first position sensor (71), a second position sensor (72) and a controller. The adjusting method comprises: detecting the deflection angle of the balance wheel (41) while a movable beam of the gantry bucket-wheel stacker-reclaimer is being raised; changing the rotating speed of a motor which drives the lifting ropes connected to the balance wheel when the deflection angle of the balance wheel (41) exceeds a predetermined angle, so as to reduce the deflection angle. The adjusting method and the adjusting device for the balance wheel can ensure that the balance wheel does not become stuck, so extending the service life of the lifting ropes and reducing the input of manual labour and power.

IPC Classes  ?

• B65G 65/02 - Loading or unloading machines comprising essentially a conveyor for moving the loads associated with a device for picking-up the loads
• B65G 65/28 - Piling or unpiling loose materials in bulk, e.g. coal, manure, timber, not otherwise provided for

Abstract

A foldable boom structure and engineering machinery having the foldable boom structure. The foldable boom structure comprises a first boom (10) and a second boom (20). The first boom (10) has a first cord member (11) and a second cord member (12) at two sides. The second boom (20) has a third cord member (21) and a fourth cord member (22) at two sides. The first cord member (11) is pivotably connected to the third cord member (21), so that the first boom (10) and the second boom (20) can be folded or unfolded together. A pivotably rotary locking device (30) is disposed on the second cord member (12), and the locking device (30) comprises a hook-shaped member (31) and a mass body (32) connected to the hook-shaped member (31). A locking joint member (23) is disposed on the fourth cord member (22). When the first boom (10) and the second boom (20) are unfolded and tilt relative to the horizontal plane, the locking joint member (23) is capable of joining the hook-shaped member (31), so as to be stopped by the hook-shaped member (31), thereby preventing the first boom (10) and the second boom (20) from being folded. The locking device can automatically perform locking or unlocking according to the position of the first boom (10) and the position of the second boom (20), thereby facilitating folding and unfolding, and structurally simplifying the foldable boom structure.

IPC Classes  ?

• B66C 23/68 - Jibs foldable or otherwise adjustable in configuration
• B66C 23/70 - Jibs assembled from separate sections to form jibs of various discrete lengths

Abstract

Provided are a method and device for measuring the opening angle of an unfolded component of engineering machinery. The device for measuring the opening angle of an unfolded component of engineering machinery comprises a ranging sensor, used for obtaining a third distance between a second pivotably connecting portion and a third pivotably connecting portion; a processor, connected to the ranging sensor, and calculating the opening angle of the engineering machinery according to a first distance, a second distance, and the third distance. The method for measuring the opening angle of an unfolded component of engineering machinery comprises the following steps: obtaining, by means of a ranging sensor, a third distance between a second pivotably connecting portion and a third pivotably connecting portion; and a processor connected to the ranging sensor calculating the opening angle of the engineering machinery according to a first distance, a second distance, and the third distance. The method and device prolong the service life of the sensor, improve the measurement precision, and simplify the measurement process.

IPC Classes  ?

• G01B 11/26 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes

Abstract

Disclosed are a wheel-side reducer frame, a wheel-side reducer, and a vehicle. The wheel-side reducer frame (10) comprises a cylindrical main body (11), and a big end (12) and a small end (13) at two sides of the cylindrical main body. The small end (13) comprises a first flange surface (14). The first flange surface (14) is provided with a first mounting hole (14a). A second flange surface (15) is further fixed in the wheel-side reducer frame. The second flange surface (15) is provided with a second mounting hole (15a) aligned with the first mounting hole (14a). Through fixing the second flange surface (15) in the wheel-side reducer frame (10), the second flange surface (15) can be used as a planetary gear carrier of a planetary gear mechanism, thereby saving the step of assembling the planetary gear carrier, constantly maintaining the alignment between the first mounting hole (14a) and the second mounting hole (15a), and ensuring the assembly precision.

IPC Classes  ?

• B60K 17/06 - Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing of change-speed gearing
• F16H 1/28 - Toothed gearings for conveying rotary motion with gears having orbital motion

Abstract

Disclosed are a lubricating structure for an inter-axle differential of a drive-through axle, and a vehicle with the lubricating structure, wherein the lubricating structure comprises a first housing, a second housing, a final drive housing and an inter-axle differential, the second housing being provided between the first housing and the final drive housing, and forming a first cavity and a second cavity, respectively, with the first housing and the final drive housing, the inter-axle differential being located in the first cavity; wherein the first cavity and the second cavity communicate with each other through a communication pipe, the location of the communication pipe where it communicates with the first cavity being lower than the location of the communication pipe where it communicates with the second cavity. When a lubricant oil in the first cavity flows through the fitting clearance between the inter-axle differential, the tandem axles and a driving gear and the bearing clearance into the second cavity leading to lubricant oil loss in the first cavity, the lubricant oil in the second cavity can flow into the first cavity through the communication pipe to compensate for the loss and to ensure that the inter-axle differential is lubricated.

IPC Classes  ?

• F16H 57/04 - Features relating to lubrication or cooling
• F16H 48/00 - Differential gearings

Abstract

A standard segment for a crane. The cross section of the standard segment is a polygon. The number of sides of the polygon is greater than 5. Each vertex of the polygon is provided with a vertical main chord (1). The number of the sides of the polygon is greater than 5, and each vertex of the polygon is provided with a vertical main chord (1), so the number of the main chords (1) is increased. Therefore, with the lifting torque of the crane remaining unchanged, the load borne by each main chord (1) may be decreased, so as to decrease the cross-sectional area of the main chord (1), decrease the manufacturing difficulty and installation difficulty of the main chord (1), and decrease the difficulty in purchasing the main chord (1). The cross-sectional area of the main chord (1) is decreased, so the cross-sectional area of shaped steel for the main chord (1) also decreases, thereby reducing original defects of the shaped steel, and ensuring safety in use of the crane.

IPC Classes  ?

• B66C 23/62 - Constructional features or details

Abstract

A limit weight of an over-wind protection switch of a crane comprises a left limit block (11) and a right limit block (12) that are pivotally connected together through a pin (13) and are in a sector open-close state, a joint surface (11a) of the left limit block and a joint surface (12a) of the right limit block forming a via hole (10a) for a steel wire rope when the left and right limit blocks are closed; a lock post (15) and a nut (17) connected to the lock post in a screwing manner, the lock post being fixedly connected to an end, away from the pin, of the right limit block; and a lock plate (16), a first end of the lock plate being pivotally connected to an end, away from the pin, of the left limit block, and a second end of the lock plate having a open groove (161) fitted in a locking manner with the lock post on a second mounting surface of the right limit block, and a counter bore (162) for receiving the nut. The limit weight can be fast assembled and disassembled, implement fast change of a multiplying power of the steel wire rope, and reduce the time for changing the multiplying power.

IPC Classes  ?

• B66D 1/56 - Adaptations of limit switches

Abstract

Disclosed are a control method for a hydraulic system and a control method for a concrete pump truck. The hydraulic system comprises a plurality of hydraulic pumps driven by a prime motor. Each hydraulic pump drives a corresponding execution mechanism. The plurality of hydraulic pumps comprises a first variable pump for driving a first execution mechanism. The control method comprises: determining a work speed of a prime motor according to a set work speed of a first execution mechanism and maximum displacement of a first variable pump; determining current required power of the first variable pump according to the set work speed and a current work pressure of the first execution mechanism, actual input power of the first variable pump being equal to rated output power of the prime motor minus actual input power of other hydraulic pumps; when the current required power of the first variable pump is greater than the actual input power of the first variable pump, reducing displacement of the first variable pump, so that the current required power of the first variable pump is equal to the actual input power of the first variable pump; when the current required power of the first variable pump is less than or equal to the actual input power of the first variable pump and a current work speed of the first execution mechanism is equal to the set work speed of the first execution mechanism, maintaining current displacement of the first variable pump. The control method for a hydraulic system and the control method for a concrete pump truck have the advantages of improving work efficiency, increasing a load factor of the prime motor, saving energy and reducing consumption.

IPC Classes  ?

• F15B 21/00 - Common features of fluid actuator systemsFluid-pressure actuator systems or details thereof, not covered by any other group of this subclass

Abstract

A drive structure for a belt conveyor comprises a driving roller (1). Two ends of the driving roller (1) are mounted on a bracket (7) through a bearing (6). The drive structure further comprises a screw (81) and a nut (82). Each side of the bracket (7) has a support beam (72). The support beam (72) is provided with a long slot (71). A bearing base (61) of the bearing (6) is disposed above the corresponding the support beam (72). The screw (81) penetrates the bearing base (61) and the long slot (71) and is fixed through the nut (82). Also disclosed are a belt conveyor with the drive structure and a bitumen stirring device. By means of the technical solution, the driving roller can be conveniently disassembled and maintained, and the tension degree of a conveying belt of the belt conveyor can be conveniently adjusted through adjusting a position of the driving roller on the support beam.

IPC Classes  ?

• B65G 23/04 - Drums, rollers, or wheels

Abstract

Disclosed are a belt conveyor and a bitumen stirring device with the belt conveyor. The belt conveyor comprises a driving roller (1), a driven roller (2), and a conveying belt (3). The driving roller and the driven roller are sleeved with the conveying belt. The driving roller is disposed on a position spaced from an output end of the belt conveyor. By means of the above technical solution, the volume of the output end of the belt conveyor becomes smaller, thereby facilitating application. When the belt conveyor is used as a feeding conveyor of the bitumen stirring device, the output end thereof can conveniently extends into a drying roller of the bitumen stirring device, thereby avoiding leaking materials or contaminating the environment, and relieving the labor intensity of workers.

IPC Classes  ?

• B65G 23/12 - Arrangements of co-operating drums or rollers to augment tractive effort applied to the belts
• B65G 15/00 - Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration

Abstract

Disclosed is a protective cover. The protective cover comprises an upper surface (2), a lower surface (3) and a side opening (1c). The upper surface has a first opening (2a), the lower surface has a second opening (3a), and the first opening and the second opening are in gas communication. The protective cover further comprises a channel (6) enabling liquid communication between the first opening and the side opening. A stop piece (3b) for preventing a liquid from flowing into the second opening is disposed on the lower surface. The present invention further provides a vehicle. The vehicle comprises the protective cover of the present invention. By means of the foregoing technical solution, heat dissipation gas may flow to the first opening through the second opening and be discharged outside, thereby ensuring desirable heat dissipation for an engine. When water from outside flows into the protective cover through the first opening, the stop piece may prevent the water from flowing through the second opening into an engine below the protective cover, and the water may be discharged outside through the channel and the side opening, so as to prevent water from entering the engine.

IPC Classes  ?

• B62D 25/10 - Bonnets or lids

Abstract

A control method for a paver comprises: during the work process of a paver, as the included angle between a sensing arm (5) of a leveling instrument (4) of the paver and the vertical direction increases when a leveling oil cylinder (1) of the paver moves upward, performing computation according to a displacement difference between a current displacement of the leveling oil cylinder and the displacement where the leveling oil cylinder is most stable and an included angle difference between the included angle and a preset setting value of the included angle to obtain a compensational lifting pressure increment for a lifting oil cylinder (2); based on the compensational lifting pressure increment, increasing the compensational lifting pressure of the lifting oil cylinder to control the lifting oil cylinder of the paver to move upward. By means of the method, when aggregates (9) fail to support a screed (3) of the paver, the compactness and evenness of a formed road surface (7) are enhanced. Further disclosed are a paver, a control device for the paver, and a paver control system.

IPC Classes  ?

• E01C 19/48 - Machines, tools, or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface

Abstract

The present invention provides a power management method, device and system for a remote service terminal and engineering machinery, which are used for solving the problems of energy waste and incapability of fully controlling the operational status of equipment mounted with the terminal due to a single operational mode of a remote service terminal in the prior art. The method comprises: when a remote service terminal enters a non-working mode, receiving a regular wakeup signal for waking up the remote service terminal, the regular wakeup signal being sent according to a preset wakeup time cycle for the non-working mode; determining a corresponding wakeup manner according to the regular wakeup signal, the wakeup manner comprising a GPS wakeup for controlling to power up a GPS module of the remote service terminal, and further comprising a full module wakeup for controlling to power up the whole remote service terminal; and according to the determined wakeup manner for the remote service terminal, executing a wakeup operation corresponding to the wakeup manner. By means of the technical solutions of the present invention, power balance management may be easily implemented.

IPC Classes  ?

• G06F 1/32 - Means for saving power

Abstract

A weld clip for manufacturing a truss-type chassis frame, including a main frame (10) and a positioning part for a front chassis frame assembly (20), a positioning part for a chassis sub-frame assembly (30) and a positioning part for a rear chassis frame assembly (40). Also disclosed is a method for manufacturing the truss-type chassis frame using the above-mentioned weld clip. The positioning and assembly is performed by fitting separately the front chassis frame assembly, the chassis sub-frame assembly, and the rear chassis frame assembly onto their respective positioning parts of the above-mentioned weld clip, then the luggage rack assembly and posts are fitted thereon, and finally welding is carried out. This enables a convenient and accurate assembly and positioning, and cutting of materials can be avoided by forming the front chassis frame assembly and the rear chassis frame assembly separately, thereby improving the utilisation of materials and reducing the costs.

IPC Classes  ?

• B23K 37/04 - Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work
• B62D 21/02 - Understructures, i.e. chassis frame on which a vehicle body may be mounted comprising longitudinally or transversely arranged frame members

Abstract

A tensioning device comprises a hydraulic cylinder (1), a main valve (2), and a first control valve (3). Two working oil ports of the main valve (2) are in communication with a rod chamber and a rodless chamber of the hydraulic cylinder (1) respectively, to control the hydraulic cylinder (1) to be in a pressure increasing state or a pressure maintaining state. A first oil line in communication with an oil tank is branched to a pipeline between the rodless chamber of the hydraulic cylinder (1) and the working oil port of the main valve (2). The first control valve (3) is serially connected to the first oil line, to control the first oil line to be conducted or cut off. Further provided is crawler mobile machinery comprising the tensioning device. By means of the technical solution, the pressure increasing operation and the pressure releasing operation of the tensioning device both become convenient, and the service life of the tensioning device and even that of the track of the crawler mobile machinery having the tensioning device can be extended.

IPC Classes  ?

• B62D 55/30 - Track-tensioning means

Abstract

A concrete pumping device and control method and device thereof, the control method of the concrete pumping device comprising: when a first pumping of a concrete pump is activated, detecting the preset pumping status of the first pumping of the concrete pump; if the preset pumping status of the first pumping is low pressure pumping, then detecting whether the working parameter of a second pumping is greater than a preset working parameter and/or detecting whether the material supply delay time of the concrete pump is greater than a preset material supply delay time value, wherein the second pumping is the previous pumping of the first pumping; if the working parameter is greater than the preset working parameter and/or the material supply delay time of the concrete pump is greater than the preset material supply delay time value, then controlling the concrete pump to switch from low pressure pumping to high pressure pumping; and after the concrete pump works in the high pressure pumping state for a first preset time, controlling the concrete pump to switch from high pressure pumping to low pressure pumping. The pumping device and the control method and device thereof can properly control the concrete pump when the pumping is activated.

IPC Classes  ?

• F04B 15/02 - Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
• F04B 49/00 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups

Abstract

A straight-line force application unit (2) includes a second drive cylinder (24) whose cylinder body is fixed and a first drive cylinder (22) which is in parallel with the second drive cylinder. The piston rod of the first drive cylinder and that of the second drive cylinder face opposite direction. The cylinder body of the first drive cylinder is connected with the piston rod of the second drive cylinder. A rod assembly machine with the straight-line force application unit is also disclosed. The straight-line force application unit and the rod assembly machine carry out the force application with a rather large working stroke in the straight line, increase the assembly state adaptability to the rods with different shapes and sizes, and the unit itself possesses a smaller space.

IPC Classes  ?

• B23P 19/027 - Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformationTools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same using hydraulic or pneumatic means
• F15B 15/00 - Fluid-actuated devices for displacing a member from one position to anotherGearing associated therewith

Abstract

A telescopic introducing system comprises an introducing mechanism (10), a traction mechanism (20), and a support mechanism. The introducing mechanism (10) comprises an introducing beam (11) and an introducing portion (12) movably disposed on the introducing beam (11). The introducing beam (11) and a lower support (40) of the crane are connected in a separable manner. The support mechanism comprises a support portion (62). The support portion (62) is disposed at a lower end of a lateral end surface of the introducing beam (11). Therefore, the distance between the end portion of the introducing mechanism completing introduction and the center of gyration is decreased significantly, the maximum elevation angle of the lifting arm during lifting is increased, the minimum radius of gyration during working of the luffing jib tower crane is decreased, and the luffing range is increased, thereby making the lifting operation convenient, and improving the safety and stability of the crane. The present invention further comprises a crane provided with the telescopic introducing system.

IPC Classes  ?

• B66C 23/28 - Cranes comprising essentially a beam, boom or triangular structure acting as a cantilever and mounted for translatory or swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib cranes, derricks or tower cranes specially adapted for use in particular locations or for particular purposes for use on building sitesCranes comprising essentially a beam, boom or triangular structure acting as a cantilever and mounted for translatory or swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib cranes, derricks or tower cranes specially adapted for use in particular locations or for particular purposes constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail constructed to operate at successively higher levels

Abstract

Disclosed is a method and structure for inter-section positioning of a crane boom, a crane boom and a crane. The method for inter-section positioning of a crane boom comprises: determining a plurality of working positions of an inner boom section (30) in an outer boom section (10); measuring in-boom width values of the inner boom section (30) at each of the plurality of working positions in the outer boom section (10) and the symmetry thereof with respect to the central line of the outer boom section; and determining the thickness and shape of each positioning piece according to the in-boom width values and the symmetry. The structure for the inter-section positioning of the crane boom comprises an outer boom section (10), and an inner boom section (30) provided in the boom sleeve of the outer boom section (10), with the tail portion of the inner boom section (30) being provided on the outer surfaces thereof with sliding blocks (50), and the inner surfaces of the outer boom section (10) being provided along the longitudinal direction of the boom sleeve thereof with positioning pieces which cooperate individually and respectively with the sliding blocks (50). A crane boom utilizing the abovementioned method and structure for the inter-section positioning of the crane boom has reduced production costs and improved production efficiency, and at the same time it also ensures the working stability thereof, so that a crane having a crane boom of this type can achieve a more reliable and safer working state.

IPC Classes  ?

• B66C 23/687 - Jibs telescopic

Abstract

An anti-tipping device (100) for a derrick tower crane comprises at least one anti-tipping cylinder (10). The anti-tipping cylinder (10) comprises a spring (116) disposed in a rodless cavity of the anti-tipping cylinder, a cantilever (118) fixedly connected to the cylinder body, a travel switch (117) mounted on the cantilever, a detection piece (119) in contact fit with the travel switch when a piston rod returns to a predetermined travel and having a predetermined fitting travel, and a control oil circuit. The control oil circuit comprises a first oil circuit (20) connected to the rod cavity of each cylinder, and a second oil circuit (30) connected to the rodless cavity of each cylinder, the first oil circuit and the second oil circuit being connected to an oil tank (40) respectively. An unloading branch (35) is disposed on the second oil circuit. An unloading cartridge valve (36) and a solenoid directional valve (37) for controlling on and off of the unloading branch are disposed on the unloading branch. The solenoid directional valve is electrically connected to the travel switch (117). The solenoid directional valve is powered on and controls the unloading branch to be in an off state when the travel switch and the detection piece are at the predetermined fitting travel. The anti-tipping device of the present invention has level 3 stiffness, so that the rigid impacts between the tower frame and the telescopic boom are reduced.

IPC Classes  ?

• B66C 23/88 - Safety gear
• B66C 23/16 - Cranes comprising essentially a beam, boom or triangular structure acting as a cantilever and mounted for translatory or swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib cranes, derricks or tower cranes with jibs supported by columns, e.g. towers having their lower end mounted for slewing movements

Abstract

A ground rail moving apparatus comprising: a guide rail (30); a driving dolly (10) arranged on the guide rail (30); and a driven dolly (20) arranged on the guide rail (30) and located behind the driving dolly (10), wherein at least one pair of driven dolly middle wheels is arranged between front wheels (21) and rear wheels (22) of the driven dolly (10), the driven dolly middle wheels being close to either the front wheels (21) or the rear wheels (22) of the driven dolly. The ground rail moving apparatus according to the present invention is able to prevent the phenomenon whereby the driven dolly becomes unbalanced due to an unstable centre of gravity causing the castor and the guide rail to become offset, and enables line contact between the driven dolly and the guide rail to be maintained, avoiding derailment of the driven dolly and greatly improving the stability and safety of the ground rail moving apparatus.

IPC Classes  ?

• B65G 35/00 - Mechanical conveyors not otherwise provided for
• B65G 11/00 - Chutes
• E04G 21/16 - Tools or apparatus

Abstract

Engineering machinery and a method and an apparatus for controlling a mechanical arm used to solve the problems existing in the prior art of low efficiency and poor results when controlling mechanical arms. The method comprises: determining the slope of each arm section of a mechanical arm in an initial position; selecting two arm sections of the mechanical arm on the basis of the principle of minimum displacement of the arm sections and according to whether the slopes are negative or positive; acquiring change values of two included angles corresponding to the degrees of freedom of the two arm sections after the mechanical arm has extended or retracted from the initial position; and controlling the mechanical arm according to the acquired change values of the two included angles. Use of this technical solution facilitates an increase in the kinematic velocity of the ends of mechanical arms and a saving in energy requirements for the movement of mechanical arms.

IPC Classes  ?

• E04G 21/02 - Conveying or working-up concrete or similar masses able to be heaped or cast
• E04G 21/04 - Devices for both conveying and distributing
• G05D 3/12 - Control of position or direction using feedback
• B60P 3/16 - Vehicles adapted to transport, to carry or to comprise special loads or objects for carrying mixed concrete, e.g. having rotatable drums

Abstract

Disclosed are a method, a device, and a remote control for controlling a mechanical arm of engineering machinery. The method comprises: determining a control starting direction of a mechanical arm; receiving information of an operating direction during a remote control operation on the mechanical arm; determining a remote control drive direction according to the angle between the control starting direction and the operating direction; and outputting information of the remote control drive direction to a drive mechanism of engineering machinery. By means of the method, an operator of a remote control can intuitively operate a mechanical arm according to the current location of the operator, so the operating manner is convenient.

IPC Classes  ?

• E04G 21/04 - Devices for both conveying and distributing
• G05D 3/00 - Control of position or direction

Abstract

Provided are an expansion mechanism, engineering machinery and fire-fighting machinery. The expansion mechanism comprises: at least two tubes nested one within another; the two adjacent tubes are respectively a first tube (1) and a second tube (3); and the second tube is located inside the first tube. The expansion mechanism also comprises a slider component installed between the first tube and the second tube. The slider component comprises: a slider (10) installed between the first tube and the second tube of the expansion mechanism; slider baffles (31, 33) installed on the first tube and located on a side of the slider longitudinal to the expansion mechanism along the frame of the tube; the slider baffles having a limiting part oriented towards the slider; the slider having limited parts adapted to the shape of the limiting parts and oriented towards the slider baffles; and the limiting parts and the limited parts forming a snap-on structure to fix the slider on the first tube in a snap-on fashion. The expansion mechanism effectively solves the problem in the prior art of a slider easily becoming loose and falling off.

IPC Classes  ?

• B66C 23/687 - Jibs telescopic

Abstract

A series cylinder and a stroke end adaptive compensation method thereof, and a concrete pumping device comprising the series cylinder. The compensation method comprises: disposing, on at least one of a first U-shaped pipe (11) and a second U-shaped pipe (13) and on at least one of a third U-shaped pipe (21) and a fourth U-shaped pipe (23), electric proportional flow control valves (51, 53, 55, 57); detecting whether the volume of oil in a communication cavity of the series cylinder is in a balanced state, and if not, controlling the opening degree of the electric proportional flow control valves (51, 53, 55, 57) to add oil into or drain oil from the communication cavity, so as to keep the volume of oil in the communication cavity in the balanced state. In the compensation method, the electric proportional flow control valve (51, 53, 55, 57) are disposed on the U-shaped pipes (11, 13, 21, 23) and the opening degree of the valves is controlled, so as to control the volume of oil added into or drained from the communication cavity, thereby precisely controlling the stroke of the cylinder.

IPC Classes  ?

• F15B 21/02 - Servomotor systems with programme control derived from a store or timing deviceControl devices therefor

Abstract

A control method and device for a mechanical arm, and engineering machinery used to overcome problems in the prior art of low control efficiency of mechanical arms and poor smoothness of flow in fluid conveyance. The method comprises: calculating the angle of closure of each set of two adjacent arm sections (1-4) of the mechanical arm; when the arm has been moved into position, selecting from among all sets of two adjacent arm sections that set of two adjacent arm sections (1-4) having the smallest such angle of closure; and using the selected set of two adjacent arm sections (1-4) as the motion arm for control. The mechanical arm thus allows maximum smoothness of flow in fluid conveyance and higher control efficiency.

IPC Classes  ?

• E04G 21/04 - Devices for both conveying and distributing
• G05D 3/12 - Control of position or direction using feedback

Abstract

Engineering machinery and a method, an apparatus and a system for controlling a mechanical arm of engineering machinery, used for solving the problem in the prior art that using a remote controller to operate a mechanical arm of the engineering machinery is relatively inconvenient. The method comprises: taking a reference benchmark direction (O1X1) as a starting edge and a remote operation direction (O1A1) as an ending edge, acquiring the size of an angle (β1) formed in a predetermined rotational positive direction; determining a mechanical arm control direction which forms the size of the angle (β1) with respect to the reference benchmark direction (O1X1) in the rotational positive direction, and then transmitting a control message to control the mechanical arm according to this direction. Using this method means that the direction of travel of the distributing points of a mechanical arm of the engineering machinery can be kept spatially consistent with the remote operation direction and, in this way, with an operator in any position and having provided any operation direction, the distributing points of the mechanical arm will all move according to the operation direction, thereby realizing direct operation of the mechanical arm, bringing convenience to the operator.

IPC Classes  ?

• E04G 21/04 - Devices for both conveying and distributing
• G05D 3/00 - Control of position or direction

Abstract

A paver and a method, device (30) and system (40) for controlling same are provided to solve the problem in the prior art that the working quality of the paver is not good. The method comprises: receiving a construction requirement parameter of a paver (S11); according to the construction requirement parameter and a preset mapping relationship between the construction requirement parameter and a construction process parameter, obtaining through mapping the construction process parameter according to the mapping relationship by using the construction requirement parameter and outputting the construction process parameter (S13); and controlling the paver according to the construction process parameter (S15). A preferred control effect of the paver is achieved through the technical solution.

IPC Classes  ?

• E01C 19/12 - Machines, tools, or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for distributing granular or liquid materials

Abstract

The present invention provides a crane with off-road tyres and a method, apparatus and system for controlling the engine thereof, used for solving the problem in the prior art that the safety performance of cranes with off-road tyres is lacking when moving with a suspended weight. The method comprises: confirming the operating status of a crane with off-road tyres, the operating status comprising a moving status and a suspended weight status; determining the idle speed of the engine thereof according to the operating status, wherein, if the operating status is moving status, determining the idle speed as a first idle speed and, if the operating status is suspended weight status, determining the idle speed as a second idle speed, the second idle speed being greater than the first idle speed; and receiving a voltage signal from a throttle pedal, determining the rotational speed of the engine according to the voltage signal and the idle speed, and then controlling the engine according to the rotational speed. Use of the technical solution of the present invention helps to avoid the risk of failure caused by moving with a suspended weight, and improves the safety performance of cranes with off-road tyres when moving with a suspended weight.

IPC Classes  ?

• F02D 29/02 - Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehiclesControlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving variable-pitch propellers
• F02D 41/08 - Introducing corrections for particular operating conditions for idling

Abstract

A concrete conveyor pipe and a manufacturing method therefor. The pipe comprises an outer layer (30) for use as a base conveyor pipe body, an inner layer (20) formed on an inner surface of the outer layer (30), and a flange section (10). The flange section (10) and the outer layer (30) are integrally formed. The inner layer (20) is a casted layer formed by casting a wear-resistant anticorrosive material onto the inner surface of the outer layer (30). The manufacturing method comprises: 1. providing the outer layer (30), which is integrally formed with the flange section (10) of the concrete conveyor pipe; 2. manufacturing the inner layer (20), where the wear-resistant anticorrosive material in a molten state is casted onto the inner surface of the outer layer (30); and 3. annealing the inner layer (20). The inner layer (20) and the outer layer (30) of the pipe are bonded tight, and the manufacturing process is free of welding process, thus providing great overall strength and wear resistance.

IPC Classes  ?

• F16L 23/00 - Flanged joints

Abstract

Provided are a method and system for controlling rotary movement of a rotary crane, to solve the problems in the prior art that the control effect is undesirable when the rotary jitter of the rotary crane is to be alleviated, the power utilization efficiency is low, and the equipment cost is increased. The method comprises: when a crane is in rotary movement, recording current values input into an electromagnetic valve of a rotary pump, and detecting the current pressure of a rotary system; and comparing the current pressure of the rotary system with a pump standard pressure, corresponding to the current values, of the crane to obtain a pressure difference, and when the pressure difference exceeds a preset value, performing pressure compensation on a hydraulic system in rotary movement. This solution helps to improve the control effect on the rotary movement of the crane, achieve high power utilization efficiency, and reduce the rotary jitter.

IPC Classes  ?

• B66C 13/18 - Control systems or devices