JPH1192832A - Structure for supporting conveying roll for induction heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of spark between a material to be heated caused by vibration at the time of its conveying, to restrain generation of a defective product, and also, to improve the service life of a conveying roll by pivoting an insulating sleeve to a bearing supporting the conveying roll so as to be freely rotatable and securing the electric insulation of the conveying roll. SOLUTION: The insulating sleeve 1 composed of an electrical insulating material is arranged to the bearing 16, and the conveying roll 12 is supported through this sleeve. At this time, as the material of the insulating sleeve 1, the insulating resin such as a polytetrafluoroethylene, etc., or a wood, etc., is used. By this constitution, the conveying roll 12 and the bearing 16 are electrically insulated and, even if the installed part of a bearing box 15 easily breaking the insulation caused by the deposit of oxide scale and dust and sticking of coating materials, etc., is grounded, generation of induction current to the ground is prevented. Then, it is desirable that the insulating sleeve 1 can be fastened with tapered sleeves 17, 18 in a bearing state to the shaft surface of the conveying roll 12 to prevent the idle rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a transfer roll in an induction heating device used in, for example, a continuous casting facility or a continuous rolling facility.

[0002]

2. Description of the Related Art In recent years, the technology of large-scale equipment for processing a metal material such as a steel plate by using an induction heater to heat the material has been put to practical use. 3 to 5 show an example of an induction heating device,
Here, transport rolls 12 are provided before and after the induction heater 11, and a material 13 to be heated such as a steel plate is
To be conveyed. Conveyance roll 12
Are connected to a cooling water flow path 14 and are cooled by cooling water from the cooling water flow path 14. Further, the transport roll 12 is used for the bearing housing 1.
The bearing 5 is rotatably supported by a bearing 16 housed therein. The inner ring of the bearing 16 is composed of two inner and outer tapered sleeves 17 and 18 in a fitted state. Further, the shaft end of the transport roll 12 is connected to an insulating coupling 19.
Is connected to the reduction gear / motor 20 via the
2 and the reduction gear / motor 20 are secured. In addition, instead of the insulating coupling 19,
When a mere coupling having no electrical insulation action is used, an insulating plate is interposed between the speed reducer / motor 20 and its mounting surface. An insulating plate 21 is interposed between the bearing housing 16 and its mounting surface.

Further, in this device, as described later,
If the transport roll 12 is not completely insulated, various problems occur. In addition to the insulating coupling 19 and the insulating plate 21 described above, insulating grease, low conductive cooling water, and high insulating cooling water are used. In addition, measures such as using a grease hose or the like, preventing grounding of the cable with a cable protection tube such as a wiring conduit or a plica tube, and not coating the insulating plate 21 with paint are taken.

[0004]

As described above, various measures have been taken to maintain the insulating property of the transport roll 12, but in reality, the installation state of the apparatus is poor,
Oxide scale and dust scattered from the material to be heated 13 accumulate, for example, around the insulating plate 21, and oil and water may permeate into the accumulation portion, and the insulating state may be broken. Oxidation scale and accumulation of dust can be prevented by thoroughly cleaning around the equipment, but generally, the environment of the above-mentioned equipment is very bad, and it is impossible to keep the circumference of the equipment clean at all times. . In addition, the mounting portion of the bearing housing 15 has a complicated shape, and it is extremely difficult to maintain insulation for a long period of time.

On the other hand, in this apparatus, transport rolls 12 are disposed before and after the induction heater 11, and if the transport rolls 12 are not completely insulated, an induced current generated in the material 13 to be heated is generated. It flows to the ground through the transport rolls 12 and causes a decrease in thermal efficiency. Further, the transport roll 12 and the material to be heated 13 that should be in contact with each other are attached or separated due to surface irregularities or vibration during transport. At the moment of the separation, a spark is generated between the two, and at the spark point, a fine pickup hole is formed on the surface of the material 13 to be heated, which causes a product defect. In addition, there arises a problem that the transport roller 12 is worn out by the spark, the outer diameter is reduced, and the life of the transport roller 12 is significantly shortened. An object of the present invention is to eliminate such a conventional problem, and an object of the present invention is to provide a support structure for a transport roll in an induction heating device capable of securing electrical insulation.

[0006]

In order to solve the above-mentioned problem, the present invention has a structure in which the bearing is rotatably supported by a bearing via an insulating sleeve.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a support structure of a transport roll 12 in the induction heating apparatus according to the present invention, and FIG.
The same reference numerals are given to portions common to the support structure shown in FIG. This transport roll 12 is used for the bearing housing 1.
The insulating sleeve 1 made of an electrically insulating material, for example, polytetrafluoroethylene,
It is rotatably supported through. The insulating sleeve 1 can be made of wood or another insulating resin material.

[0008] With this configuration, the transport roll 12
The bearing housing 1 is electrically insulated from the bearing 16 and the insulation is easily broken by oxide scale, accumulation of dust, adhesion of paint, and the like.
The flow of the induced current to the ground is prevented even if the mounting portion 5 is grounded. The support of the transport roll 12 has a simple structure with the insulating sleeve 1 interposed therebetween.
In addition, since it is a rotating body, dirt can be automatically cleaned (wiped). Further, the insulating sleeve 1 can be tightened by taper sleeves 17 and 18 and is fastened in a bare hack shape to the shaft surface of the transport roll 12, and the frictional force generated as a result causes the insulating sleeve 1 to idle around the shaft surface. Is prevented.

[0009] As shown in FIG.
Preferably, at least one cut 2 is provided in the direction inclined with respect to the tangential direction. By doing so, the fastening of the insulating sleeve 1 to the shaft surface can be further strengthened.

[0010]

As is apparent from the above description, according to the present invention, a structure is provided in which a bearing is rotatably supported by a bearing via an insulating sleeve. For this reason, the electrical insulation of the transport roll is ensured, and the induced current generated in the material to be heated does not flow to the ground through the transport roll, and good thermal efficiency is maintained. Thus, there is an effect that good product quality and the life of the transport roll can be ensured without spark.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a support structure of a transport roll according to the present invention.

FIG. 2 is a view showing a preferred form of an insulating sleeve applied to the support structure shown in FIG. 1;

FIG. 3 is a diagram schematically showing an induction heating device.

FIG. 4 is a diagram showing a conventional transport roll and a peripheral portion thereof.

FIG. 5 is a sectional view showing a support structure of the transport roll shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation sleeve 12 Conveyance roll 16 Bearing

Claims (1)

[Claims] 1. A support structure for a transport roll in an induction heating device, wherein the transport roll is rotatably supported by a bearing via an insulating sleeve.