JPH08353Y2 - Inductor coil protection device for induction heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an induction heating apparatus for induction heating a body to be heated formed of a metal material, and particularly to an inductor coil incorporated in the induction heating apparatus. The present invention relates to an inductor coil protection device for an induction heating device that protects from heat radiated from a heating body.

[Prior Art] For example, in a steel mill or the like, a coarse bar edge heating step of heating the edge of a continuously moving coarse bar by a roller or the like is configured as shown in FIG. 4, for example.
That is, the rough bar 1 made of, for example, a thin steel strip is conveyed in a direction indicated by an arrow 3 at a constant speed by rollers 2a and 2b which are rotationally driven by a drive motor (not shown). A pair of magnetizers 4a and 4b are arranged at the lower and upper positions of each essence 1a and 1b in the width direction of the rough bar 1. Then, the pair of magnetizers 4a and 4b constitute the induction heating device 5.

The induction heating device 5 is configured, for example, as shown in FIG. That is, in the magnetizer 4a disposed below the edge 1a of the rough bar 1, the inductor coils 7a and 7b are wound around the magnetic poles 6a and 6b of the iron core 6. In general, the gap between the inductor coils 7a, 7b and the iron core 6 is filled with a caster material such as resin. Also in the magnetizer 4b arranged above the edge 1a, each inductor coil is wound around each magnetic pole of the iron core. And each part power supply 8
When an exciting current is supplied to each inductor coil from, the iron core 6 is magnetized, and a magnetic flux 9 is generated between the lower magnetizer 4a and the upper magnetizer 4b. Then, since the magnetic flux 9 vertically passes through the rough bar 1 made of a thin steel strip, an eddy current 10 is generated in the rough bar 1. Therefore, the eddy current 10 heats the vicinity of the edge 1a of the rough bar 1.

The temperature of the coarse bar 1 to be heated by the induction heating device 5 having such a basic structure is generally as high as 1000 ° C. or higher. Further, in order to efficiently heat the coarse bar 1 by the induction heating device 5s, it is necessary to bring the magnetizers 4a and 4b as close to the coarse bar 1 as possible. The interval is usually at most
It is about 10mm. Therefore, the radiant heat from the rough bar 1 is directly applied to the inductor coils 7a, 7b of the magnetizers 4a, 4b. As a result, the surface of each inductor coil 7a, 7b facing the rough bar 1 is heated to near 1000 ° C. In addition, the cooling equipment arranged on the side of the rough heating bar 5 of the induction heating device 5 in the conveying direction causes the cooling water transmitted on the surface of the rough bar 1 to drop onto the inductor coils 7a, 7b of the magnetizer 4a located below. To do.
Therefore, the inductor coils 7a and 7b near 1000 ° C. are rapidly cooled. That is, it receives a thermal shock. When it receives a thermal shock, a rapid contraction stress occurs. When this thermal shock is repeatedly applied, there is a concern that the insulation of the coil copper tube may be destroyed. Therefore, the durability life of the induction heating device 5 as a whole is reduced.

In order to eliminate such inconvenience, as shown in FIG. 6, the upper surface of the magnetizer 4a mounted on the base plate 14 is
A heat insulating board 13 is commonly covered with the same caster material 11 filled in the gap between the inductor coils 7a, 7b and the iron core 6, and the upper surface of the magnetizer 4a covered with the caster material 11 is covered with a cushion material 12 via a cushion material 12. It is installed. Therefore, the heat insulation board 13 causes the coarse bar 1 to move to the inductor coils 7a and 7a.
It is possible to prevent heat from being radiated to b.

[Problems to be Solved by the Invention] However, as shown in FIG.
Insulation board 1 on top of inductor coils 7a, 7b covered with
The induction heating device 5 equipped with 3 still had the following problems to be improved.

That is, in order for the magnetic flux 9 to reach the rough bar 1 efficiently, the heat insulating board 13 needs to be formed of a non-magnetic material. Generally, the heat insulating board 13 is made of a ceramic material which is a non-magnetic material and has a good heat insulating property.

However, although this ceramic material has very excellent heat insulating properties, it has a drawback that it is very weak against thermal shock. Further, since the upper surface of the magnetizer 4a also has a certain area or more, there is a concern that a sudden thermal contraction stress may act and the heat insulating board 13 may crack.

If the induction heating device 5 continues to operate while the cracking phenomenon occurs, the scale drops from the coarse bar 1 heated to 1000 ° C. or higher during transportation onto the heat insulating board 13 and flows down on the heat insulating board 13. . During this flow-down process, the scale may enter the magnetizer 4a from the cracked portion, reach the inductor coils 7a and 7b, and destroy the insulation of the coil steel pipe.

Further, since the caster material 11 formed on the upper surface of the iron core 6 around which the inductor coils 7a and 7b are wound requires a molding and firing process, it is not possible to finish the upper surface of the caster material 11 into a uniform smooth surface. Very difficult. Therefore,
If a heat insulating board 13 made of a hard material such as combimica or ceramics is placed on the upper surface of the caster material 11, a gap may be formed between the caster material 11 and the heat insulating board 13,
Alternatively, the heat insulating board 13 is attached with an inclination. In this case, if there is a gap, the magnetic force by the inductor coils 7a, 7b acts in the process where the scale falls on the heat insulation board 13 and flows down, and the scale is sucked into the magnetizer 4a through the gap. There is a concern that it will happen. Therefore, there is a concern that the insulation of the coil steel pipe may be destroyed by this high-temperature scale.

The present invention has been made in view of such circumstances, and by providing a heat insulating board and a cover member formed of a glass cloth material on a caster mold that covers the inductor coil and the iron core, the inductor coil is provided with a heating target. It is possible to prevent radiant heat from being applied and to prevent cracks from occurring even if water drops are dropped from above, and moisture and scale enter the magnetizer. It is an object of the present invention to provide an inductor coil protection device for an induction heating device, which is capable of preventing a failure due to deterioration of insulation, etc., and extending the life of the entire induction heating device including the inductor coil.

[Means for Solving the Problems] In order to solve the above problems, in the inductor coil protection device of the induction heating device of the present invention, the gap between the iron core and the inductor coil of the magnetizer formed by winding the inductor coil around the iron core is provided. A caster mold that fills and covers the outer surface of the iron core, and is attached to the upper surface of this caster mold,
A heat insulating board formed by alternately laminating a plurality of glass cloth materials and a plurality of amorphous caster materials made of glass fibers in a cross shape, and the same material as the glass cloth material, and the upper surface of the heat insulating board and the casters. The heat-resistant adhesive is provided so as to cover the side surface of the mold at the same time, and the heat-resistant adhesive filled between the cover member and the upper surface of the heat insulating board and between the side surface of the cover member and the side surface of the caster mold.

[Operation] In the inductor coil protection device for an induction heating device configured as described above, the iron core and the inductor coil forming the magnetizer are covered with the caster mold. A heat insulating board is provided on the upper surface of the magnetizer covered with the caster mold, and the upper surface of the heat insulating board and the side surface of the caster mold are covered with the cover member. Then, the cover member is attached to the upper surface of the heat insulating board and the side surface of the caster mold with a heat resistant adhesive.

The heat-resistant board is formed by alternately laminating an amorphous caster material and a glass cloth material. Glass fiber has very strong physical properties against compressive stress, bending stress and heat shrinkage stress. It also has very high heat resistance. Further, since the amorphous caster material is laminated, the gaps between the fibers of the glass cloth material are clogged. Therefore, water and scale do not penetrate this heat-resistant board.

Further, the cover member covers the upper surface of the heat-resistant board and the side surface of the caster mold, and they are bonded with a heat-resistant adhesive.
Therefore, invasion of water or scale from the side surface is prevented.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the bottom of the rough bar 1 in the induction heating device including a pair of magnetizers arranged on both sides of the edge 1a in the width direction of the rough bar 1 as a heated object formed of the metal material in FIG. FIG. 3 is an exploded perspective view showing a schematic configuration of a magnetizer 21 arranged on the side. 2 is a schematic sectional view of the magnetizer 21, and FIG. 3 is an enlarged view of a portion indicated by a circle A in FIG.
The same parts as those in FIG. 6 are designated by the same reference numerals, and detailed description of the overlapping parts will be omitted.

The iron core 6 is placed on the base plate 14, and the inductor coils 7a and 7b are wound around the magnetic poles 6a and 6b formed on the iron core 6. Then, the gap between each magnetic pole 6a, 6b and the inductor coil 7a, 7b is filled with a caster material made of, for example, a resin having excellent heat resistance. In addition, caster materials are attached to the upper surface of the iron core 6 and the side surfaces of the iron core 6. That is, the inductor coils 7a, 7b are connected to the magnetic poles 6a,
It is obtained by putting the entire iron core 6 in a state of being wound around 6b in a mold, injecting a caster material, molding and firing. And finally, as shown in the figure,
Gap between 6a, 6b and inductor coil 7a, 7b, and iron core 6
The caster mold 22 that covers the upper surface and the side surface of the can be formed. The thickness of the portion of the caster mold 22 that covers the upper surface and the side surface of the iron core 6 is, as shown in FIG.
It is about 2 mm.

Then, the heat insulating board 23 is placed on the upper surface 22a of the caster mold 22. Further, the cover member 24 covers the upper surface of the heat insulating board 23 and each side surface 22b of the caster mold 22.

As shown in FIG. 3, the heat insulating board 23 is formed by alternately stacking five glass cloth materials 25 and four amorphous caster materials 26. The glass cloth material 25 is obtained by impregnating a caster material with a cloth-shaped fiber ceramic fiber for ultrahigh temperature composed of three components of alumina, boron oxide and silica. In the embodiment, caster material is impregnated with Nextel cloth manufactured by 3M (USA). The amorphous caster material 26 is made of the same resin as the caster mold 22. Then, it is obtained by molding and firing in a state of being laminated in five layers. In this way, since the material is glass fiber, it is resistant to thermal shock, and by using caster material,
A high heat insulation effect can be obtained. The thickness of the heat insulating board 23 after being molded and fired is about 10 as shown in FIG.
mm.

The cover member 24 is made of the same material as the glass cloth material 25 used for the heat insulating board 23. And
As shown in FIG. 1, notches 27 are formed at the four corners. Then, the cover member 24 is bent at the position of the cut portion 27 to divide one cover member 24 into an upper surface portion 24a and four bent portions 24b.

Then, the heat insulating board 23 is placed on the upper surface of the magnetizer 6 covered with the caster mold 22.
The cover member 24 with the heat-resistant adhesive 28 applied to the inner surface is covered from above. Therefore, the upper surface 24a of the cover member 24
The magnetizer 6 whose inner surface is adhered to the upper surface of the heat insulating board 23 with a heat-resistant adhesive 28, and the inner surface of each bent curved surface 24b of the cover member 24 is covered with the caster mold 22 with the heat-resistant adhesive 28.
Is bonded to the side surface 22b. Therefore, the heat resistant adhesive 28 is filled in a gap of about 1 mm between the upper surface of the heat insulating board 23 and the inner surface of the upper surface 24a of the cover member 24. Also, each bent surface 24b
Since the heat-resistant adhesive 28 is also bonded to the side surface 22b of the caster mold 22, the notches 27 at the four corners are bonded to each other.

Further, each gap of the cover member 24 formed of the glass cloth material is eventually clogged with the heat resistant adhesive 28. The heat resistant adhesive 28 can be made of the same material as the caster mold 22. The thickness of the upper surface 24a of the cover member 24 is 1.5 to 2.0 mm.

In the case of the inductor coil protection device of the induction heating device configured as described above, the inductor coils 7a and 7b forming the magnetizer 6 are, as shown in FIGS. Then, it is covered with the heat resistant adhesive 28 and the cover member 24. The side surface of the magnetizer 6 is covered with a caster mold 22, a heat resistant adhesive 28, and a cover member 24.

The cover member 24, which directly faces the rough bar 1 heated to, for example, 1000 ° C. or more as a heated object at a close distance, has a very strong physical property against compressive stress, bending stress, and heat shrinkage stress. Therefore, even if the upper surface 24 of this cover member 24
Even if water falls on a, it will not be damaged by thermal contraction. Also, even if the scale falls, it does not burn.

As described above, the glass cloth material 26 forming the heat insulating board 23 has a very strong physical property against compressive stress, bending stress, and heat shrinkage stress. Therefore, even if water permeates the cover member 24 and reaches the insulating board 23, the insulating board 23 does not crack due to thermal contraction.

In addition, the amorphous caster material 25 that constitutes the heat insulating board 23
Has very high heat resistance properties and is a glass cloth material
26 gaps are clogged. Therefore, water or scale does not penetrate the heat insulating board 23 and reach the upper surface 22a of the caster mold 22 located on the lower side.

Further, the cover member 24 covers the upper surface of the heat insulating board 23 and the side surface of the caster mold 22, and the heat resistant adhesive 28 is used for adhesion. Therefore, from the side, the water or scale is magnetized.
It does not penetrate inside 21.

In this way, even if water or scale falls, it is blocked by the cover member 24 and the heat insulating board 23 and does not enter the inside of the magnetizer 21. Therefore, it is possible to significantly extend the durable life of the inductor coils 7a and 7b.

[Effects of the Invention] As described above, according to the inductor coil protection device of the present invention, the heat insulating board and the cover member formed of the glass cloth material are provided on the caster mold that covers the inductor coil and the iron core. Therefore, it is possible to prevent the radiant heat from being applied to the inductor coil from being applied, and it is possible to prevent cracks or the like from occurring in the cover member or the heat-resistant board even if it is rapidly cooled by a drop of water or the like. . Therefore, it is possible to reliably prevent moisture and scale from entering the magnetizer, prevent failures due to insulation deterioration, etc., and prolong the life of the entire induction heating device including the inductor coil.

[Brief description of drawings]

1 to 3 show an inductor coil protection device for an induction heating device according to an embodiment of the present invention. FIG. 1 is an exploded perspective view showing the overall structure, FIG. 2 is a schematic sectional view, FIG. 3 is a partial cross-sectional view showing an essential part of FIG. 2, FIG. 4 is a view showing a production line in which an induction heating device is arranged, and FIG. 5 is a general induction heating device. Perspective view,
FIG. 6 is a sectional view showing a general magnetizer. 1 ... Coarse bar, 6 ... Iron core, 7a, 7b ... Inductor coil, 21 ... Magnetizer, 22 ... Caster mold, 23 ...
Insulation board, 24 …… Cover member, 25 …… Undefined caster material, 26 …… Glass cloth material, 28 …… Heat resistant adhesive.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Satoru Terada 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. (72) Yoshihiro Ito 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. (72) Inventor Shinji Kamekawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. (56) Reference JP-A-51-117912 (JP, A) Japanese Patent Publication Sho-56 -50769 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. A magnetizer formed by winding an inductor coil around an iron core is provided in the vicinity of the lower side of a body to be heated formed of a metallic material, and the magnetizer passes through the body to be heated. In an inductor coil protection device of an induction heating device that forms a magnetic flux and protects the inductor coil in the induction heating device that heats the object to be heated by the eddy current generated by the magnetic flux, in the inductor coil protection device, A caster mold that fills the gap of the inductor coil and covers the outer surface of the iron core, and a plurality of glass cloth materials and a plurality of amorphous caster materials that are attached to the upper surface of the caster mold and are made of glass fiber in a cross shape. An insulating board formed by alternately laminating the glass cloth material and the glass cloth material, and the upper surface of the insulating board and the caster mold. And a heat-resistant adhesive that is filled between the cover member and the upper surface of the heat insulating board and between the cover member and the side surface of the caster mold, respectively. Inductor coil protection device for induction heating device.