JPS60194010A - Method and device for conveying treating material for continuous heat treating furnace - Google Patents

Abstract

PURPOSE:To simplify an installation for treatment and transfer in a high-temp. part by inclining the hearth surface of an industrial furnace for continuous heat treatment of treating materials to the angle at which the treating materials descend by overcoming friction resistance and transferring the treating materials in the direction descending on the hearth surface. CONSTITUTION:The hearth surface of an industrial furnace 1 for continuous heat treatment of a treating material 3 is inclined to the angle at which the moving object including the material 3 descends by overcoming friction resistance. When the material 3 on a charging table 2 is carried up to the peak part of the hearth surface by an elevator 5, the material 3 descends along the hearth surface. The material is heat-treated in a heating zone (a), is cooled in a cooling zone (b) and is then ejected onto an ejecting table 9. The elevator 5 conveys continuously the material 3 to the hearth surface and the material 3 is continuously heat-treated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for conveying treated materials in a continuous heat treatment furnace and an apparatus therefor. This article relates to a method and apparatus for transporting processing materials in an industrial furnace (C) in which processing materials are heat-treated while being continuously transported in heating and cooling equipment.

Continuous heat treatment furnaces have been widely used since they are superior in productivity and economy compared to batch type heat treatment furnaces. However, since the hearth of the conventional continuous heat treatment furnace is installed horizontally, there are many problems with the means of transporting the treated material on the hearth, especially when heating the treated material to high temperatures. Industrial furnaces have many problems due to their high temperatures.

The following two are typical means for conveying the treated material on the horizontal hearth in a conventional continuous heat treatment furnace.

Firstly, there is a roller hearth type. This is a roller placed on the hearth.

When the roller is forcibly rotated by power, the processing material on the roller is transferred.

This roller hearth system has the disadvantage of requiring extremely large rollers to transport heavy materials at high temperatures of 1,500°C or higher, which can significantly increase equipment costs. Moreover, since the bottom surface of the treated material is shielded from the heat source by the roller, there is a major drawback that the heat transfer rate performance is also reduced.

The second method is the walking beam method, which is often found in billet heating furnaces in the steel industry. In this method, a movable support beam that can move vertically and backwards and forwards and a fixed support beam that simply holds the processing material are appropriately arranged on the hearth, and the rectangular movements of the movable support beam are ascent, forward, descent, and backward. In this method, the material to be processed is transported step by step, as if walking. In this method, a large load is applied to both the movable and fixed support beams in a high-temperature atmosphere, and in order to increase the opening of the bottom of the treated material to the heat source, it is desirable to have as small a support as possible, so water-cooled supports are generally used. There is. i.e. water cooling device (structure)
The structure for moving forward and backward and up and down, including the Moreover, it is not good for the requirement of uniform heating of the treated material.

It is an object of the present invention to provide a method and apparatus for transporting treated materials in a continuous heat treatment furnace, which can simplify the means for conveying treated materials especially in a high-temperature section, and improve the reliability and maintainability of the entire equipment. This is the purpose.

For this reason, 1 the method of the present invention is configured such that the hearth surface of an industrial furnace in which the treated material is continuously heat-treated is inclined at an angle at which the moving object containing the treated material descends by overcoming frictional resistance, It is characterized in that the treated material is transferred in a downward direction along the inclined hearth surface.

Further, the configuration of the apparatus of the present invention is such that an industrial furnace for continuously heat-treating treated materials is provided with a hearth surface inclined at an angle at which a moving object containing the treated materials descends by overcoming frictional resistance, and A processing material transfer device that carries the material to the top of the inclined hearth surface, and an auxiliary transfer device that adjusts the descending speed of the moving object containing the processing material on the inclined hearth surface. It is a feature.

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

The drawing shows an embodiment of the device according to the invention.

In Fig. 1, numeral 1 denotes a continuous heat treatment furnace, which has a heating zone a and a cooling zone b2, and as described later, the hearth surface is at an angle at which the moving object containing the treatment material overcomes frictional resistance and descends. is inclined to. 2 is a charging table; 3 is a heat-treated material; 4 is an atmospheric gas replacement chamber; 5 is a material transfer device such as an elevator or crane for transporting the material 3 to the top of the inclined hearth surface; 6 is the power supply unit, 7
9 is a temperature control unit, 8 is a furnace atmosphere adjustment unit, and 9 is a temperature control unit.
is an extraction table.

In FIGS. 2 and 3, 10 is an inclined guide rail that forms the main part of the hearth surface, 11 is a pallet on which the treated material 3 is placed, and 12 is attached to the lower part of the pallet 11 so that it can be moved on the rail 10. This is Laura, who is transferring. Further, reference numeral 13 indicates the processing material 3 and the pallet 1 on the inclined guide rail 10.
A roller chain 14 is provided endlessly below the rail 10 as an auxiliary transport device for adjusting the descending speed of moving objects including 1, and 14 is a sprocket meshing with the chain 13. Reference numeral 15 shown in FIG. 2 is a heater, and reference numeral 16 shown in FIG. 5 is a retaining member attached to the lower part of the pallet 11 and removably engaged with the roller chain 13.

In the processing material conveying device for the continuous heat treatment furnace configured as shown, the processing material 3 to be heat-treated is transported to the top of the charging table 2 by a transport means (not shown), and is transported to the top of the charging table 2 in the atmospheric gas exchange chamber 4. The processed material is transferred to the processing material transfer device 5 through the. Note that when heating the treated material 3 to a high temperature, a special atmospheric gas such as nitrogen or argon is often used for heating, but when combustion gas for heating is used as the atmospheric gas, the gas exchange chamber 4 is It is unnecessary. Next, the treated material 3 is carried up to the top of the sloping hearth surface of the continuous heat treatment furnace 1 by a treated material transfer device 5 such as an elevator or a crane, and then transferred horizontally to the treated material transfer device 5 attached to the treated material transfer device 5. It is planned that a function (same as the traverse of an overhead crane) will automatically load the pallets 11 waiting on the inclined guide rails 10. That is, these functions are performed by a known mechanism similar to, but different in scale from, the transfer of steel plates and coils in modern automated warehouses, parking facilities, and steel mills.

Further, as shown in FIG. 6, the guide rail 10, which forms the main part of the hearth surface of the continuous heat treatment furnace 1, is inclined at an angle θ with respect to the horizontal line 17.
If the total weight of the moving object including 1 is W, and the component force of this W in the direction of the rail 10 is F, then F==Wsinθ, and this F becomes the downward driving force, but from this F, friction The force minus the resistance acts as an effective descending propulsive force. Therefore, θ must be selected to a value that allows the moving object to overcome the frictional resistance and descend. For example, if the coefficient of friction is 0.2, θ is approximately 11° or more. Actually, it is desirable that this θ is in the range of 5° to 45°.

In this way, the guide rail 10 is inclined at an angle θ that satisfies the above-mentioned requirements, so that the treated material 5 rides on the pallet 11 in the continuous heat treatment furnace 1, overcomes the frictional resistance, and moves along the rail 10. It descends, is heated in the heating zone a, cooled in the cooling zone, and is extracted to the extraction table 9 together with the pallet 11.

Here, the transfer speed of the processing material 3 within the continuous heat treatment furnace 1 depends on the production conditions of the furnace 1, and therefore needs to be adjusted as desired. Therefore, in this embodiment, the processing materials 3 are loaded on pallets 11 linked together by roller chains 13. The roller chain 13 is restrained from moving freely by a sprocket 14 placed on the hearth. As a result, the transfer speed of the processing material 3 is adjusted by applying braking to the sprocket 14 and adjusting the rotational speed of the sprocket 14. The force required for adjustment is extremely small compared to a conventional horizontal hearth because it has a downward driving force due to the total weight W of the moving objects surrounding the processing material 3 and the pallet 11. As a result, the auxiliary transfer device represented by the roller chain 13 and the tin rocket 14 has become significantly smaller, and if consideration is given to arranging the sprocket 14 as much as possible to avoid the high temperature region and place it in the low temperature region, it is possible to There is no need to take heat-resistant measures such as shielding or using high-grade heat-resistant materials.

In the above embodiment, the pallet 11 is used, but the pallet 11 is omitted and the processing material 3 is transferred to the roller chain 13.
It may also be linked directly to

As described above, the method of the present invention is configured such that the hearth surface of an industrial furnace in which the treated material is continuously heat-treated is inclined at an angle at which a moving object containing the treated material descends by overcoming frictional resistance,
Since this is a method of transporting the treated material in the direction of descending the inclined hearth surface, the moving object has a downward driving force,
Therefore, there is no need for any costly conveying means at the hearth, such as the conventional roller hearth system or walking beam system, and this is highly effective both technically and economically.

Furthermore, the apparatus of the present invention is an industrial furnace that continuously heat-treats treated materials, and is equipped with a hearth surface inclined at an angle at which a moving object containing the treated materials descends by overcoming frictional resistance, and Since the processing material transfer device is provided to carry the processing material to the top of the inclined hearth surface, the processing material is carried to the top of the inclined hearth surface by the processing material transfer device and transferred to the top of the hearth surface. Then, all that is left to do is to adjust the transfer speed of the treated material because it is equipped with an auxiliary transfer device that adjusts the descending speed of the moving object containing the treated material along the hearth surface. can be adjusted optimally to suit the production conditions in the heat treatment furnace, and its auxiliary transfer device is significantly smaller than that of a conventional horizontal hearth, and no heat-resistant measures are required. Alternatively, a very simple countermeasure may be sufficient. Therefore, the processing material transfer equipment in the high temperature section can be simplified, the reliability of the equipment can be improved, and maintenance costs can be reduced, which is extremely beneficial.

[Brief explanation of drawings]

The drawings show one embodiment of the apparatus of the present invention, in which Fig. 1 is an overall perspective view, Fig. 2 is an enlarged perspective view mainly showing the hearth inside the furnace, and Fig. 3 is an operational view. FIG. DESCRIPTION OF SYMBOLS 1... Continuous heat treatment furnace, 3... Processing material, 5... Processing material transfer device, 10... Inclined guide rail, 11.@φ
Pallet, 12...O roller, 13...Red roller chain, 14...Sprocket, 16...Engaging member, 1
7...Horizontal line, θ...Inclination angle.

Claims (1)

[Claims] 1. The hearth surface of an industrial furnace for continuously heat-treating treated materials is configured to be inclined at an angle at which a moving object containing the treated materials descends by overcoming frictional resistance. 1. A method for transporting treated material in a continuous heat treatment furnace, characterized in that the treated material is transported in a downward direction on a hearth surface. 2. An industrial furnace for continuously heat-treating treated materials, comprising a hearth surface inclined at an angle at which a moving object containing the treated material descends by overcoming frictional resistance, and A continuous heat treatment furnace, characterized in that it is equipped with a processing material transfer device that carries the processing material to the top of the surface, and an auxiliary transfer device that adjusts the descending speed of the moving object containing the processing material on the inclined hearth surface. processing material conveyance device.