This heating furnace is provided with: a housing having a pair of sidewalls; a workpiece support material configured to be capable of supporting a flat plate-shaped workpiece between the pair of sidewalls so that the workpiece is in a horizontal position; a planar heater for heating from below or above the workpiece supported by the workpiece support material; an electric power supply device for supplying electric power to the planar heater; and a heater support material for supporting the planar heater so that the planar heater is in a horizontal position. The planar heater has a plurality of heating bodies installed arranged side-by-side in a transport direction and in a left-right direction perpendicular in plan view to the transport direction. The plurality of heating bodies have electric wires and sintered bodies for housing the electric wires, include two or more types of heating bodies having different dimensions or shapes, and include intermediate heating bodies having other heating bodies arranged side-by-side in the left-right direction at the opposite ends of the intermediate heating bodies. The electric power supply device has an electric power supply unit for supplying electric power from the sidewalls to each of the heating bodies.
3 transformation temperature to 950° C. The furnace includes: multiple-staged heating units that accommodate steel sheets, each heating unit formed by thermal insulation materials disposed around the periphery; and far-infrared radiation heaters positioned above and below the heating units. A far-infrared radiation heater is received by first metal strips. The first metal strips are disposed so that their strong axis direction approximately corresponds to the direction of gravity and supported by support pieces so as to be expandable and contractible in a longitudinal direction by thermal expansion or thermal contraction. The support pieces are disposed outside the thermal insulation materials in the heating units and a ceiling unit.
F27D 11/12 - Aménagement des éléments pour le chauffage électrique dans ou sur les fours avec champs électromagnétiques agissant directement sur le matériau à chauffer
3.
FAR INFRARED RADIATION MULTISTAGE HEATING FURNACE FOR STEEL PLATES FOR HOT PRESSING
Provided is a far infrared radiation multistage type heating furnace for steel plates for hot pressing provided with flexible far infrared radiation heaters that do not bend during heating from the Ac3 transformation temperature to 950°C. The far infrared radiation multistage heating furnace has multiple stages of heating units formed from a thermal insulation material disposed around the periphery thereof and accommodating steel plates for hot pressing, and far infrared radiation heaters disposed in the upper part and lower part of the heating units. A far infrared radiation heater (14-1) is mounted on a plurality of first metal bands (26) and is disposed substantially horizontally. The plurality of first metal bands (26) is provided such that the direction of the strong axis substantially aligns with the direction of gravity, and is supported by supporting material (27) so as to be freely expandable and contractible because of thermal expansion or thermal contraction in the longitudinal direction. The supporting material (27) is disposed more to the outside of the heating unit and a ceiling unit than the thermal insulation material.
The purpose of the present invention is to provide stable support over an extended period of time to a hot-pressed steel plate which is accommodated within a far-infrared multistage heating furnace, using steel plate support members that have a small planar projected area and minimized thermal deformation. This far-infrared multistage heating furnace has: a heating unit and a ceiling unit provided in multiple stages in the vertical direction, the heating unit and ceiling unit accommodating a hot-pressed steel plate comprising an aluminum-plated steel plate or a zinc-plated steel plate; and far-infrared heaters arranged inside the heating unit and the ceiling unit, the far-infrared heaters heating the hot-pressed steel plate to at least the Ac3 transition point but no higher than 950°C. Within the heating unit are arranged steel plate support members for supporting the hot-pressed steel plate through point contact or line contact against the hot-pressed steel plate, the steel plate support members being supported so as to be capable of expanding and contracting in the longitudinal direction due to thermal expansion or thermal shrinkage.
The present invention provides a far infrared heating furnace for a steel plate for hot pressing wherein thermal deformation of the furnace body and various parts of the furnace body is suppressed. A far infrared heating furnace (10) is provided with: heating units (13-1 - 13-6) and a roof unit (19) having blocks formed from thermal insulation material and disposed encompassing a space for accommodating a steel plate for hot pressing in a horizontal plane, and far infrared radiation heaters disposed above and below the steel plate for hot pressing for heating the steel plate for hot pressing; and a steel furnace body frame (12) disposed surrounding the heating units and roof unit. The furnace body frame is provided with spacers (17-1 - 17-7) for separating and supporting the heating units and roof unit from the furnace body frame.
Provided is a temperature-measurement system (10) capable of stably measuring the temperature at one or more locations without producing a standing wave even in a spacious area. The system is equipped with one or more sensor units (20), an antenna system (30) for electromagnetically coupling with the sensor units (20) and forming a resonance circuit, and a measurement means (40) connected to the antenna system (30). The sensor unit (20) is configured so as to connect a piezoelectric vibrator (21) and a coil (22). The antenna system (30) is configured so as to connect one or more antenna units (60) to a transmission line (32) in parallel. The antenna units (60) configure resonance circuits from coils (61) and capacitors (62). The transmission line (32) has one end thereof connected to the output terminal of the measurement means (40), and has the other end thereof terminating at a resistance (33) satisfying a characteristic impedance of the transmission line. The measurement means (40) supplies high-frequency power to the antenna system (30), and receives and observes power reflected from the antenna system (30).
G01K 1/02 - Moyens d’indication ou d’enregistrement spécialement adaptés aux thermomètres
G01K 7/32 - Mesure de la température basée sur l'utilisation d'éléments électriques ou magnétiques directement sensibles à la chaleur utilisant la variation de la fréquence de résonance d'un cristal
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