JPH0559197U - Stand for heating material of vertical induction furnace - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a supporting metal object capable of heating a heating material almost uniformly in a vertical induction heating furnace. [Structure] A cavity 28 is provided inside a metal support 22 provided on the top of a support 21 of a vertical induction heating furnace, and a heat insulating material 33 is filled in the cavity 28. The heat insulating material 33 prevents a temperature drop due to water cooling in a portion directly above the cavity portion 28. Further, the temperature drop due to water cooling near the outer peripheral surface of the support metal 22 is compensated by the skin effect of induction heating.
As a result, the low temperature portion near the supporting metal is reduced, so that the heating material 1 is heated almost uniformly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a support base that supports a plate-shaped heating material in a vertical posture in a vertical induction heating furnace.

[0002]

[Prior Art]

 Among induction heating furnaces, there is a vertical induction heating furnace in which the furnace chamber opens downward and has a support base that can be moved up and down. In a vertical induction heating furnace, for example, the supporting table supports the material side surface from below so that the plate surface of the plate-shaped material is in a vertical posture, and the supporting table rises to load the material into the furnace. The material is heated with the plate surface vertical. Such a vertical induction heating furnace is used, for example, to heat a grain-oriented electrical steel slab to a high temperature of 1200 ° C. or higher in a non-oxidizing atmosphere.

The support base must support the heating material in a high temperature state, and the top of the support base is required to have heat resistance higher than the material heating temperature and high strength. Therefore, a supporting metal member made of high temperature and high strength material is attached to the top of the supporting base along the longitudinal direction of the supporting base. As such a material, for example, a Co alloy-based heat resistant steel (heat resistant temperature limit: about 1300 ° C.) is used. In addition, the supporting hardware is cooled to prevent deterioration. For example, in the supporting metal disclosed in Japanese Utility Model Publication No. 56-7826, the lower surface is water-cooled. Further, in the supporting metal disclosed in JP-A-1-136928, an atmosphere gas supply pipe is provided in the supporting metal and the lower surface is water-cooled.

[0004]

[Problems to be solved by the device]

 As described above, since the supporting metal is water-cooled, the vicinity of the surface of the heating material that contacts the supporting metal is cooled by the supporting metal. FIG. 4 shows the temperature distribution of the heating material (slab) near the support metal. FIGS. 4A and 4B show temperature distributions in the slab thickness direction and the length direction, respectively. The higher temperature at the edges is due to the skin effect of induction heating. FIG. 4C shows the temperature distribution in the slab width direction. The temperature of the lower part of the slab is lower than that of the upper part of the slab because the lower surface of the slab is in contact with the cooled metal support. In either direction, reducing the amount of cooling water improves the non-uniform temperature distribution, but leaves a low temperature part.

The present invention is intended to provide a support base that can heat a heating material substantially uniformly in a vertical induction heating furnace and that enables heating with good quality and yield.

[0006]

[Means for Solving the Problems]

 In the heating material support of the present invention, a support metal is attached to the top of the support along the longitudinal direction of the support, and a cavity is provided inside the support. Then, the heat insulating material is filled in the cavity.

As the heat insulating material, castable, plastic refractory, and other irregular refractory materials are suitable. In the length direction and the thickness direction of the heating material, the thickness of the support metal from the inner surface of the cavity to the outer surface of the support is about 1 to 2 times the depth of current penetration. If the supporting metal is composed of two members that can be divided into upper and lower parts, it becomes easy to form the cavity and fill the heat insulating material. The divided members are connected by a cotter or a pin.

[0008]

[Action]

 The heat insulating material filled in the cavity inside the supporting metal prevents the temperature drop due to water cooling in the area directly above the cavity. In addition, the temperature near the surface of the outer periphery of the supporting metal is lowered by water cooling of the lower surface, but this temperature drop is compensated by the skin effect of induction heating (see Fig. 2). As a result, the temperature of the heating material near the supporting metal is prevented from lowering, and the heating material can be heated almost uniformly.

[0009]

【Example】

 An embodiment of the present invention will be described with respect to a support base of a vertical induction heating furnace for heating a grain-oriented electrical steel slab.

FIG. 5 schematically shows a vertical induction heating furnace for heating a slab. As shown in the drawing, the furnace body 12 of the vertical induction heating furnace 11 is opened downward, and the heating coil 15 is attached to the outer periphery of the side wall 13. Further, it is provided with a support table 21 for supporting the slab 1 in the furnace in a vertical posture. A support hardware 22 is attached to the top of the support base 21.

FIG. 1 is a vertical cross-sectional view of the support metal. The support hardware 22 includes a base 24 and a support 27. Further, the base portion 24 and the supporting portion 27 are fitted to each other, and are connected by inserting the cotter 31. The hollow portion 28 of the support portion 27 is previously filled with the heat insulating material 33. A cooling water passage 25 is provided in the pedestal portion 24, and an irregular refractory material 36 is covered by a stud 35 on the outside thereof.

FIG. 3 shows the slab temperature distribution in the vicinity of the support metal member when the slab is heated using the support table configured as described above. FIGS. 3A and 3B show temperature distributions in the slab thickness direction and the length direction, respectively. As shown in these diagrams, the temperature difference is smaller than when the cooling water amount is reduced in the conventional supporting metal. FIG. 3C shows the temperature distribution in the slab width direction. As is clear from this diagram, the lower surface of the slab is in contact with the cooled support metal, but the range of temperature drop is narrower and the slab is almost uniformly heated than when the cooling water amount in the conventional support metal was reduced. Is achieved.

[0013]

[Effect of the device]

 In the support base of this invention, the heat insulating material is filled in the cavity provided inside the support metal. The heat insulating material prevents a temperature drop due to water cooling just above the cavity. In addition, the temperature drop due to water cooling near the surface of the supporting metal is compensated by the skin effect of induction heating. As a result, the temperature of the heating material in the vicinity of the supporting metal is prevented from lowering, and the heating material can be heated almost uniformly. Further, by providing the hollow portion, the amount of heat-resistant steel used can be reduced correspondingly, and the cost of the supporting metal can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a support metal according to an embodiment of the present invention.

FIG. 2 is a view for explaining the action of compensating for the temperature drop due to water cooling of the outer peripheral surface of the supporting metal by the skin effect of induction heating.

FIG. 3 is a diagram showing a slab temperature distribution in the vicinity of a supporting metal member when a slab is heated using the support base of the present invention.

FIG. 4 is a diagram showing a slab temperature distribution in the vicinity of a supporting metal member when a slab is heated using a conventional support table.

FIG. 5 is a perspective view schematically showing an example of a vertical induction heating furnace in which the present invention is implemented.

[Explanation of symbols]

 1 Slab (Heating Material) 11 Induction Heating Furnace 12 Furnace Body 13 Side Wall 15 Heating Coil 21 Supporting Stand 22 Supporting Hardware 24 Standing Section 25 Cooling Water Channel 27 Supporting Section 28 Cavity 31 Cotter 33 Thermal Insulation 35 Stud 36 Atypical Refractory

Claims (1)

[Scope of utility model registration request] 1. An induction heating furnace, comprising: a support base that vertically supports a plate-shaped heating material from below and elevates the support base; and a support metal piece attached to the top of the support base along the longitudinal direction of the support base. There is a cavity inside the hardware,
A heating material support base for a vertical induction heating furnace, characterized in that a cavity is filled with a heat insulating material.