JPS626125Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a roller for supporting and transporting a material to be treated in a furnace such as a heating furnace or a heat treatment furnace.

[Conventional technology]

Conventionally, many rollers have been proposed for supporting and conveying a material to be treated in a furnace such as a heating furnace or a heat treatment furnace, but each of them has had its own problems in use. For example, carbon rollers cannot be used in oxidizing atmospheres and have low wear resistance. Asbestos rollers have low heat resistance and abrasion resistance,
It is difficult to use in a furnace at temperatures above about 1000℃, and frequent replacement is required due to wear and deterioration. Steel rollers, plating rollers, overlay rollers, and ceramic thermal spray rollers such as those described in JP-A No. 144414/1986 have a tendency to transfer peeled pieces of the treated material and their oxides to the roller surface (hereinafter referred to as build-up). ), which caused scratches on the material to be treated and hindered productivity.

With a water-cooled roller in which water is passed directly inside the roller, there is a problem that when the material to be treated is a thin strip, the strip is partially rapidly cooled and thermally deformed at the contact area with the water-cooled roller. In addition, the heat inside the furnace was absorbed by the low-temperature rollers, reducing the thermal efficiency of the furnace. On the other hand, in the ceramic sleeve roller described in Japanese Utility Model Publication No. 57-40356, the impact is caused by the impact when the roller is installed or the impact that the welded part and the defective part of the strip give to the roller surface when the strip is threaded. Even in mild cases, there was a problem that minute cracks would grow and the rollers would break during use, and moisture absorbed during assembly work would cause local explosions inside the furnace. Furthermore, the ceramic crawler
A build-up of over 1000℃ was occurring.

[Problem that the invention attempts to solve]

This invention overcomes the above problems of conventional rolls,
In addition to improving wear resistance, heat resistance, impact resistance, and water resistance, it also prevents scratches on the processed material caused by build-up and deformation of the processed material due to rapid cooling, resulting in energy saving and long maintenance. The purpose is to make it possible to be free.

[Means and actions to solve the problem]

The present invention will be explained below with reference to embodiments shown in the drawings. The roller shown in FIG. 1 includes an outer shell 1 having a cylindrical surface that supports and conveys the material to be processed, and a refrigerant pipe 2 disposed inside the outer shell 1 through a gap 6. It is configured such that a refrigerant 8 is supplied from the outside into a refrigerant flow path 7 formed inside the tube 2 .

The surface of the outer shell 1 is coated with a coating 5 having high build-up resistance, thereby imparting excellent build-up resistance.

The support shafts 4 and 4' are provided with a supply port 9' and a discharge port 9'' for the auxiliary refrigerant 10, the gap 6 is used as an auxiliary refrigerant flow path, and cooling air can be pumped from the outside as the auxiliary refrigerant 10.The refrigerant pipe Both ends of 2 are support shafts 4
and 4'. Water as a refrigerant 8 is conducted from the outside through the support shafts 4, 4' and the refrigerant flow path 7 formed inside the refrigerant pipe 2.

The outer surface of the refrigerant pipe 2 cooled by water conduction is
The temperature is much lower than that of the outer shell 1 which is exposed in the heat treatment furnace and is pressed against the material to be treated. This temperature difference causes radiant heat transfer, convective heat transfer, and conductive heat transfer within the cavity 6, and heat transfer occurs between the inner surface of the outer shell 1 and the outer surface of the refrigerant pipe 2, so that the outer shell 1 is slowly cooled. Ru. Therefore, the thermal influence of the rollers on the material to be treated can be suppressed to a minimum, and deformation of the material to be treated due to rapid cooling can be prevented. Furthermore, by maintaining an appropriate temperature difference between the material to be treated and the outer shell 1, build-up can be prevented from occurring.

In this case, it is necessary to control the temperature of the outer shell 1 to an optimum temperature that does not cause build-up or deformation of the material to be treated.

For example, in a continuous annealing furnace for stainless steel plates, Ni-based stainless steel plates are annealed at about 1200°C, and Cr-based stainless steel plates are annealed at about 850°C. At this time, by controlling the roll surface temperature to be 200 to 300°C lower than the furnace temperature, build-up and thermal deformation of the steel strip can be eliminated. However, replacing the rolls every time the furnace temperature changes reduces the work rate and thermal efficiency of the furnace. In this case, by using this roll, the furnace temperature can be increased to 1200℃.
In this case, by filling the void 6 with air at atmospheric pressure, the surface temperature of the outer shell 1 can be lowered to about 950°C mainly by radiation heat transfer.
It is possible to keep it at ℃. On the other hand, when the furnace temperature is 850°C, it is possible to maintain the surface temperature of the outer shell 1 at about 600°C by feeding compressed air or the like into the gap 6 through radiation heat transfer and forced convection heat transfer.

According to this embodiment, for example, a roller surface temperature of 600 to 900°C can be ensured in an atmosphere with a furnace temperature of 800 to 1100°C, thereby ensuring build-up resistance, and at the same time, the build-up resistance can be maintained at a roller surface temperature of 500°C or lower. Avoiding thermal deformation of the treated material,
In addition, by reducing the temperature difference between the material to be treated and the roller surface, it is possible to reduce deterioration of the roller surface due to thermal shock.

〔effect〕

This invention improves the abrasion resistance, heat resistance, impact resistance, and water resistance of the heat-resistant roller, reduces the frequency of maintenance and replacement of the heat-resistant roller, and makes it easier to handle the roller. , thermal deformation can be prevented, and quality, yield, workability, and maintainability can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention. 1: Outer shell, 2: Refrigerant pipe, 3: Rotating shaft, 4,
4': Support shaft, 5: Coating, 6: Gap,
7: Refrigerant flow path, 8: Refrigerant, 9': Auxiliary refrigerant supply port, 9'': Auxiliary refrigerant discharge port, 10: Auxiliary refrigerant.

Claims (1)

[Scope of utility model claims] A heat-resistant roller for supporting and transporting a material to be treated in a furnace, the roller having a refrigerant flow path through a gap inside the roller, and an auxiliary refrigerant supply port and discharge port provided in the gap.