JP2022120985A - Hearth structure for rotary hearth furnace - Google Patents

Abstract

To easily prevent a rotary hearth from colliding with an inner peripheral side wall and an outer peripheral side wall when the ring-shaped rotary hearth provided between the inner peripheral side wall and the outer peripheral side wall of a furnace body at a required interval is rotated in the circumferential direction.SOLUTION: To rotate a ring-shaped rotary hearth 20 provided between an inner peripheral side wall 11 and an outer peripheral side wall 12 of a furnace body 10 at a required interval in the circumferential direction, roller members 21, 22 are provided under the rotary hearth to form a ring shape, and rail members 31, 32 supporting the roller members are provided on an installation basement G supporting the rotary hearth to form a ring shape. One roller member 21 includes a restriction part 23 placing restriction so that the rotary hearth does not come into contact with any of the inner peripheral side wall and the outer peripheral side wall.SELECTED DRAWING: Figure 2

Description

The present invention relates to a hearth structure in a rotary hearth furnace. In particular, a ring-shaped rotary hearth is provided between the inner peripheral side wall and the outer peripheral side wall in the furnace body provided with the inner peripheral side wall, the outer peripheral side wall, and the ceiling, and the rotary hearth is provided. is rotated in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall, when the rotary hearth is rotated in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall Another feature is that it is possible to easily prevent the rotary hearth from colliding with the inner peripheral side wall or the outer peripheral side wall of the furnace body due to deviation of the rotational position of the rotary hearth.

Conventionally, as shown in Patent Documents 1 to 4, a furnace body provided with an inner peripheral side wall, an outer peripheral side wall, and a ceiling is formed into a ring shape with a required gap between the inner peripheral side wall and the outer peripheral side wall. A rotary hearth furnace is used in which a rotary hearth is provided, and the rotary hearth is rotated in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall.

Here, in such a rotary hearth furnace, an object to be processed is set on the rotary hearth, and the rotary hearth is surrounded between the inner peripheral side wall and the outer peripheral side wall as described above. When the workpiece set on the rotary hearth is heat-treated in the rotary hearth furnace, the rotary hearth expands and contracts due to the temperature rise in the furnace. If such operations are repeated many times, the rotary hearth and the like will gradually deform.

As a result, the rotational position of the rotary hearth rotating in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall gradually shifts and rotates, and the rotating rotary hearth comes into contact with the inner peripheral side wall and the outer peripheral side wall. However, there is a problem that these parts are damaged in the furnace, and the atmosphere and heat in the furnace leak to the outside.

Therefore, in Patent Document 3, it is proposed that the rotary hearth be composed of two or more layers of refractories and that the refractories have specific properties.

However, when the rotary hearth is composed of two or more layers of refractories and refractories with specific characteristics are used in this way, the costs are high, and depending on the conditions of use of the rotary hearth furnace, There was a problem that the above problems could not be solved.

Further, in Patent Document 4, it is proposed to adjust the center of the rotary hearth to an appropriate position by means of a spring.

However, when the center of the rotary hearth is adjusted by the spring, the force of the spring gradually decreases, making it difficult to maintain the center of the rotary hearth at an appropriate position. There is a problem that the rotating hearth gradually deviates from the rotating position and cannot stably prevent the rotary hearth from coming into contact with the inner peripheral side wall and the outer peripheral side wall.

Japanese Unexamined Patent Application Publication No. 2012-78000 Japanese Utility Model Publication No. 58-32122 Japanese Patent Application Laid-Open No. 2006-313060 Japanese Patent No. 5841296

The present invention provides a ring-shaped rotary hearth with a required space between the inner and outer side walls of the furnace body provided with the inner and outer side walls and the ceiling as described above. The object of the present invention is to solve the above problems in a rotary hearth furnace in which the rotary hearth is rotated in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall.

That is, in the present invention, in the rotary hearth furnace as described above, the rotary hearth is rotated in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall, and the workpiece is set on the rotary hearth. When heat-treating , even if such an operation is repeated many times, the rotary hearth is rotated at an appropriate position so that the rotating rotary hearth does not come into contact with the inner peripheral side wall or the outer peripheral side wall. The object of the present invention is to prevent these from being damaged, and to prevent the atmosphere and heat in the furnace from leaking to the outside.

In the first invention of the hearth structure of the rotary hearth furnace according to the present invention, in order to solve the above problems, the inner peripheral side wall in the furnace body provided with the inner peripheral side wall, the outer peripheral side wall, and the ceiling is provided. A rotary hearth furnace in which a ring-shaped rotary hearth is provided between the outer peripheral side wall and a required gap, and the rotary hearth is rotated in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall. In the above, a roller member is provided in a ring shape under the rotary hearth, and a rail member supporting the roller member provided under the rotary hearth is provided in a ring shape on an installation base that supports the rotary hearth. At least one of the roller member and the rail member is provided with a restricting portion for restricting the rotary hearth from coming into contact with either the inner peripheral side wall or the outer peripheral side wall.

Thus, while the roller members are provided in a ring shape under the rotary hearth, the rail members for supporting the roller members provided under the rotary hearth are provided in a ring shape on the installation base for supporting the rotary hearth. and at least one of the roller member and the rail member is provided with a regulating portion for regulating the rotary hearth so that it does not come into contact with any of the inner peripheral side wall and the outer peripheral side wall. Even when the operation of heat-treating the workpiece set on the rotary hearth in the rotary hearth furnace by rotating it in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall, the rotation The position of the rotating hearth is regulated by the regulating portion, so that the rotating hearth is rotated at an appropriate position, and the rotating rotary hearth is prevented from coming into contact with the inner peripheral side wall and the outer peripheral side wall. , these are not damaged, and the atmosphere and heat in the furnace do not leak out to the outside.

Here, in providing one of the roller member and the rail member with the regulating portion for regulating the position of the rotary hearth from being displaced in the radial direction and coming into contact with the inner peripheral side wall and the outer peripheral side wall as described above. is provided with a regulating portion on at least one of the inner peripheral side and the outer peripheral side of the roller member, and when the rotational position of the rotary hearth is displaced, the regulating portion comes into contact with the rail member, The rotary hearth can be regulated so as not to come into contact with either the inner peripheral side wall or the outer peripheral side wall.

Further, in providing a restricting portion on one of the roller member and the rail member as described above, the restricting portion for restricting contact with the inner peripheral side wall and the outer peripheral side wall due to the position of the rotary hearth being displaced in the radial direction is provided. A regulating portion is provided on at least one of the inner peripheral side and the outer peripheral side of the rail member, and when the rotational position of the rotary hearth is displaced, the regulating portion comes into contact with the roller member and rotates. The hearth can be regulated so as not to come into contact with either the inner peripheral side wall or the outer peripheral side wall.

Further, in the second invention of the hearth structure of the rotary hearth furnace according to the present invention, in order to solve the above problems, the inner circumference of the furnace body provided with the inner peripheral side wall, the outer peripheral side wall, and the ceiling is provided. A rotary hearth in which a ring-shaped rotary hearth is provided between the side wall and the outer peripheral side wall with a required space therebetween, and the rotary hearth is rotated in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall. In the floor furnace, a rail member is provided in a ring shape under the rotary hearth, and a roller member for supporting the rail member provided under the rotary hearth is provided on the installation base for supporting the rotary hearth. At least one of the rail member and the roller member is provided with a regulating portion for regulating the rotary hearth so that it does not come into contact with either the inner peripheral side wall or the outer peripheral side wall.

Thus, while the rail member is provided in a ring shape under the rotary hearth, the roller member supporting the rail member provided under the rotary hearth is provided in a ring shape on the installation base for supporting the rotary hearth. and at least one of the rail member and the roller member is provided with a regulating portion for regulating the contact of the rotary hearth with the inner peripheral side wall and the outer peripheral side wall, the first rotary furnace In the same manner as in the invention of the hearth structure of the floor furnace, the rotary hearth is rotated in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall, and the work set on the rotary hearth is moved to the rotary hearth furnace. Even when the operation of heat-treating inside the furnace is repeated many times, the position of the rotating rotary hearth is regulated by the regulating part, so that the rotary hearth is rotated at an appropriate position. The hearth is prevented from coming into contact with the inner peripheral side wall and the outer peripheral side wall, and these are prevented from being damaged, and the atmosphere and heat in the furnace are prevented from leaking to the outside.

Here, as described above, at least one of the rail member and the roller member is provided with a regulating portion for regulating contact with the inner peripheral side wall and the outer peripheral side wall due to the position of the rotary hearth being displaced in the radial direction. In this case, a regulating portion is provided on at least one of the inner peripheral side and the outer peripheral side of the roller member, and when the rotational position of the rotary hearth is displaced, the regulating portion comes into contact with the rail member. , the rotary hearth can be regulated so as not to come into contact with either the inner peripheral side wall or the outer peripheral side wall.

Further, in providing a restricting portion to one of the rail member and the roller member as described above for restricting the position of the rotary hearth from being displaced in the radial direction and coming into contact with the inner peripheral side wall and the outer peripheral side wall, A regulating portion is provided on at least one of the inner peripheral side and the outer peripheral side of the rail member, and when the rotational position of the rotary hearth is displaced, the regulating portion comes into contact with the roller member and rotates. The hearth can be restricted from coming into contact with the inner peripheral side wall and the outer peripheral side wall.

In the hearth structure of the rotary hearth furnace according to the present invention, the roller member is provided in a ring shape under the rotary hearth as described above, and the roller member is provided under the rotary hearth on the installation base for supporting the rotary hearth. Alternatively, a rail member is provided in a ring shape under the rotary hearth, and a rail member is provided under the rotary hearth on an installation base that supports the rotary hearth. The rotary hearth does not come into contact with at least one of the roller member and the rail member, and neither the inner peripheral side wall nor the outer peripheral side wall. The rotary hearth is rotated in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall, and the workpiece set on the rotary hearth is moved in the rotary hearth furnace. Even if the heat treatment operation is performed many times, the position of the rotating rotary hearth is regulated by the regulating portion, so that the rotary hearth can be stably rotated at an appropriate position.

As a result, in the hearth structure of the rotary hearth furnace of the present invention, the rotary hearth is rotated in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall, and the material to be treated is set on the rotary hearth. Even when the heat treatment operation is performed many times, the rotating rotary hearth is prevented from coming into contact with the inner peripheral side wall and the outer peripheral side wall, and these may be damaged or the atmosphere and heat in the furnace may leak to the outside. There is no need to put it out.

In an embodiment of the present invention, a ring-shaped rotary hearth provided between the inner peripheral side wall and the outer peripheral side wall in the furnace body provided with the inner peripheral side wall, the outer peripheral side wall, and the ceiling is provided between the inner peripheral side wall and the outer peripheral side wall. 1 is a schematic perspective view showing a state in which a part of a furnace body in a rotary hearth furnace that is rotated in a circumferential direction between is cut away; FIG. In the first embodiment using the rotary hearth furnace shown in FIG. A rail member for supporting the roller member provided below is provided in a ring shape, and the rotation position of the rotary hearth is shifted to contact the inner peripheral side wall and the outer peripheral side wall on the inner peripheral side of the roller member. and FIG. 11 is a schematic cross-sectional view showing a state in which a restricting portion for restricting is provided. In the first embodiment, when the position of the rotary hearth is displaced in the radial direction, the regulating portion provided on the inner peripheral side of the roller member comes into contact with the rail member, and the rotary furnace 1 is a schematic cross-sectional view of one side of a rotary hearth furnace showing a state in which the floor is prevented from contacting the inner peripheral side wall and the outer peripheral side wall; FIG. FIG. 7 is a schematic cross-sectional view of one side of a rotary hearth furnace showing a state in which the restricting portion is provided on the outer peripheral side of the roller member in the modified example of the first embodiment. In the second embodiment using the rotary hearth furnace shown in FIG. A rail member for supporting the roller member provided below is provided in a ring shape, and the rotation position of the rotary hearth is displaced to contact the inner peripheral side wall and the outer peripheral side wall on the inner peripheral side of the rail member. 1 is a schematic cross-sectional view of one side of a rotary hearth furnace, showing a state in which a regulating portion for regulating is provided; FIG. FIG. 9 is a schematic cross-sectional view of one side of a rotary hearth furnace showing a state in which the restricting portion is provided on the outer peripheral side of the rail member in a modification of the second embodiment. In the third embodiment using the rotary hearth furnace shown in FIG. 1, a rail member is provided in a ring shape under the rotary hearth, and a rotary furnace is mounted on the installation base for supporting the rotary hearth. A roller member for supporting a rail member provided under the floor is provided in a ring shape, and the rotation position of the rotary hearth is displaced on the inner peripheral side of the roller member and contacts the inner peripheral side wall and the outer peripheral side wall. 1 is a schematic cross-sectional view of one side of a rotary hearth furnace, showing a state in which a restricting portion for restricting rotation is provided; FIG. FIG. 10 is a schematic cross-sectional view of one side of a rotary hearth furnace showing a state in which the restricting portion is provided on the outer peripheral side of the roller member in the modified example of the third embodiment. In the fourth embodiment using the rotary hearth furnace shown in FIG. 1, a rail member is provided in a ring shape under the rotary hearth, and a rotary furnace is mounted on the installation base for supporting the rotary hearth. A roller member supporting a rail member provided under the floor is provided in a ring shape, and the rotation position of the rotary hearth is displaced to contact the inner peripheral side wall and the outer peripheral side wall on the inner peripheral side of the rail member. 1 is a schematic cross-sectional view of one side of a rotary hearth furnace, showing a state in which a restricting portion for restricting rotation is provided; FIG. FIG. 11 is a schematic cross-sectional view of one side of a rotary hearth furnace showing a state in which the restricting portion is provided on the outer peripheral side of the rail member in the modified example of the fourth embodiment.

A hearth structure of a rotary hearth furnace according to an embodiment of the present invention will be specifically described below with reference to the accompanying drawings. It should be noted that the hearth structure of the rotary hearth furnace according to the present invention is not limited to those shown in the following embodiments, and can be modified as appropriate without changing the gist of the invention.

Here, in the embodiment of the present invention, as a rotary hearth furnace X, as shown in FIG. A ring-shaped rotary hearth 20 is provided between the outer peripheral side wall 12 and the inner peripheral side wall 11 and the outer peripheral side wall 12 with a required gap therebetween. The one that rotates in the circumferential direction between the outer peripheral side wall 12 is used.

The object W to be processed is carried into the furnace body 10 through an inlet (not shown) provided in the outer peripheral side wall 12, set on the rotary hearth 20, and travels around the inside of the furnace body 10. It is then heat-treated and carried out through an outlet (not shown) provided on the outer peripheral side wall 12 .

(First embodiment)
In the first embodiment, a rotary hearth furnace X as described above is used, and as shown in FIGS. The pair of roller members 21 and 22 provided under the rotary hearth 20 are supported on the installation base G that supports the rotary hearth 20. A pair of rail members 31 and 32 are provided in a ring shape.

Further, as described above, the ring-shaped rotary hearth 20 is placed between the inner peripheral side wall 11 and the outer peripheral side wall 12 of the furnace body 10 so as to have a required space between the inner peripheral side wall 11 and the outer peripheral side wall 12. When provided, it prevents the atmosphere and heat in the furnace body 10 from leaking outside from the gap between the rotary hearth 20 and the inner peripheral side wall 11 and the gap between the rotary hearth 20 and the outer peripheral side wall 12, In order to recover fallen materials from inside the furnace body 10, an inner peripheral side water seal trough 14a is provided between the rotary hearth 20 and the inner peripheral side wall 11, and an outer peripheral side water seal trough 14a is provided between the rotary hearth 20 and the outer peripheral side wall 12. A water sealing trough 14b is provided.

Here, in the first embodiment, a regulating portion 23 having a larger diameter than the roller 21a is provided on the inner peripheral side of the roller 21a in the roller member 21 located on the outer peripheral side under the rotary hearth 20. is provided.

In the first embodiment, the workpiece W is set on the rotary hearth 20, and the rotary hearth 20 is surrounded between the inner peripheral side wall 11 and the outer peripheral side wall 12 as described above. When the workpiece W set on the rotary hearth 20 is rotated in the direction and heat-treated in the rotary hearth furnace X, the rotary hearth 20 is gradually deformed by the heat during the heat treatment, and the rotary furnace rotates. When the position of the hearth 20 shifts in the radial direction and rotates eccentrically, as shown in FIG. Before coming into contact with the side wall 12, the regulating portion 23 provided on the inner peripheral side of the roller 21a of the roller member 21 supports the roller member 21. The position of the rotating rotary hearth 20 is regulated by contacting the side.

In addition, when the rotary hearth 20 is shifted and rotated as described above, before the rotary hearth 20 contacts the inner peripheral side wall 11 and the outer peripheral side wall 12, the roller 21a of the roller member 21 The regulating portion 23 provided on the inner peripheral side comes into contact with the inner peripheral side of the rail member 31 positioned on the outer peripheral side supporting the roller member 21, thereby regulating the position of the rotating rotary hearth 20. As shown in FIG. 2, the gap d between the regulating portion 23 provided on the inner peripheral side of the roller 21a in the roller member 21 and the inner peripheral side of the rail member 31 is set to the rotary hearth 20 and the inner peripheral side. The gap d1 is designed to correspond to the gap d1 between the side wall 11 and the gap d2 between the rotary hearth 20 and the outer peripheral side wall 12, and the gap d is made narrower than the gap d1 or the gap d2.

As a result, in the first embodiment, the rotating rotary hearth 20 is prevented from coming into contact with the inner peripheral side wall 11 and the outer peripheral side wall 12. The atmosphere and heat are prevented from leaking to the outside.

Here, in the first embodiment, a regulating portion 23 having a larger diameter than the roller 21a is provided on the inner peripheral side of the roller 21a in the roller member 21 located on the outer peripheral side provided under the rotary hearth 20. The regulating portion 23 contacts the inner peripheral side of the rail member 31 positioned on the outer peripheral side supporting the roller member 21 so that the position of the rotating rotary hearth 20 is regulated. 4, a regulating portion 23 having a larger diameter than the roller 21a is provided on the outer peripheral side of the roller 21a in the roller member 21 located on the outer peripheral side provided under the rotary hearth 20, and this regulating portion 23 may contact the outer peripheral side of the rail member 31 positioned on the outer peripheral side supporting the roller member 21 to restrict the position of the rotating rotary hearth 20 . Here, in the case shown in FIG. 4 , when the regulating portion 23 provided on the outer peripheral side of the roller 21 a contacts the outer peripheral side of the rail member 31 positioned on the outer peripheral side supporting the roller member 21 , the rotary hearth 20 is prevented from being displaced toward the inner peripheral side (right side in FIG. 3) and coming into contact with the inner peripheral side wall 11 .

In the cross-sectional view of the rotary hearth furnace X shown in FIG. 2, the left half and the right half are symmetrical, and the left half of the linked rotary hearth 20 faces the inner peripheral wall 11 side. If it shifts, the right half portion shifts toward the outer peripheral side wall 12 side.

Furthermore, although not shown, the regulating portion 23 is provided on the inner peripheral side and the outer peripheral side of the roller 22a in the roller member 22 located on the inner peripheral side provided under the rotary hearth 20, and the regulating portion 23 can be brought into contact with the inner or outer peripheral side of the rail member 32 positioned on the outer peripheral side supporting the roller member 22 to regulate the position of the rotating rotary hearth 20.

(Second embodiment)
Also in the second embodiment, the rotary hearth furnace X shown in FIG. 1 is used, and as shown in FIG. 5, a pair of The pair of roller members 21 and 22 are provided in a ring shape with a required spacing in the radial direction, and are provided on the installation base G that supports the rotary hearth 20 and below the rotary hearth 20. A pair of rail members 31 and 32 for supporting the respective roller members 21 and 22 are provided in a ring shape.

Here, in the second embodiment, in the rail member 31 located on the outer peripheral side that supports the roller member 21 located on the outer peripheral side provided under the rotary hearth 20, the inner peripheral end of the rail member 31 A restricting portion 33 projecting upward is provided in the portion.

In the second embodiment, the workpiece W is set on the rotary hearth 20, and the rotary hearth 20 is surrounded between the inner peripheral side wall 11 and the outer peripheral side wall 12 as described above. When the workpiece W set on the rotary hearth 20 is rotated in the direction and heat-treated in the rotary hearth furnace X, the rotary hearth 20 is gradually deformed by the heat during the heat treatment, and the rotary furnace rotates. When the position of the bed 20 shifts in the radial direction and rotates eccentrically, before the rotary hearth 20 comes into contact with the inner peripheral side wall 11 and the outer peripheral side wall 12, the rail member 31 moves upward from the inner peripheral side end of the rail member 31. The regulating portion 33 protruding outward comes into contact with the inner peripheral side of the roller 21a of the roller member 21 supported by the rail member 31, and the position of the rotating rotary hearth 20 is regulated.

As a result, in the second embodiment, as in the first embodiment, the rotating rotary hearth 20 is prevented from coming into contact with the inner peripheral side wall 11 and the outer peripheral side wall 12. Damage and leakage of the atmosphere and heat in the rotary hearth furnace X to the outside are prevented.

In addition, in the second embodiment, in the rail member 31 located on the outer peripheral side that supports the roller member 21 located on the outer peripheral side provided under the rotary hearth 20, the upper end of the inner peripheral side However, as in the modification shown in FIG. 6, the rail member located on the outer peripheral side supporting the roller member 21 located on the outer peripheral side provided under the rotary hearth 20 31, a restricting portion 33 protruding upward is provided at the end portion on the outer peripheral side thereof, and before the rotary hearth 20 contacts the inner peripheral side wall 11 and the outer peripheral side wall 12, the outer peripheral side of the rail member 31 is provided. A regulating portion 33 protruding upward from an end portion contacts the outer peripheral side of the roller 21a of the roller member 21 supported by the rail member 31 so that the position of the rotating rotary hearth 20 is regulated. is also possible.

Furthermore, although not shown, in the rail member 32 located on the inner peripheral side that supports the roller member 22 located on the inner peripheral side provided under the rotary hearth 20, the end portion on the inner peripheral side and the outer peripheral side A regulating portion 33 protruding upward is provided at the end of the rail member 32, and the regulating portion 33 is provided on the inner peripheral side and the outer peripheral side of the roller 22a in the roller member 22 positioned on the inner peripheral side supported by the rail member 32. It is also possible to regulate the position of the rotating rotary hearth 20 by contacting them.

(Third embodiment)
In the third embodiment, the rotary hearth furnace X shown in FIG. 1 is used, and as shown in FIG. A roller that is provided in a ring shape with an interval therebetween and supports the pair of rail members 24 and 25 provided under the rotary hearth 20 on the installation base G that supports the rotary hearth 20 Members 34 and 35 are provided in a ring shape.

Here, in the third embodiment, the inner peripheral side of the roller 34a in the outer peripheral roller member 34 that supports the outer peripheral rail member 24 provided under the rotary hearth 20 is provided from the roller 34a. is provided with a restricting portion 36 having a large diameter.

In the third embodiment, the workpiece W is set on the rotary hearth 20, and the rotary hearth 20 is surrounded between the inner peripheral side wall 11 and the outer peripheral side wall 12 as described above. When the workpiece W set on the rotary hearth 20 is rotated in the direction and heat-treated in the rotary hearth furnace X, the rotary hearth 20 is gradually deformed by the heat during the heat treatment, and the rotary furnace rotates. When the position of the bed 20 shifts in the radial direction and rotates eccentrically, before the rotary hearth 20 contacts the inner peripheral side wall 11 and the outer peripheral side wall 12, the inner peripheral side of the roller 34a in the outer peripheral roller member 34 The provided large-diameter restricting portion 36 contacts the inner peripheral side of the outer peripheral rail member 24 supported by the roller member 34 so that the position of the rotating rotary hearth 20 is restricted. become.

As a result, in the third embodiment, as in the first and second embodiments, the rotating rotary hearth 20 is prevented from coming into contact with the inner peripheral side wall 11 and the outer peripheral side wall 12. , are prevented from being damaged, and the atmosphere and heat in the rotary hearth furnace X are prevented from leaking to the outside.

Here, in the third embodiment, the inner peripheral side of the roller 34a in the outer peripheral roller member 34 that supports the outer peripheral rail member 24 provided under the rotary hearth 20 is provided from the roller 34a. A regulating portion 36 having a large diameter is provided, and the regulating portion 36 comes into contact with the inner peripheral side of the outer rail member 24 supported by the roller member 34, thereby regulating the position of the rotating rotary hearth 20. However, as in the modified example shown in FIG. It is also possible to regulate the position of the rotating rotary hearth 20 by contacting the outer peripheral side of the rail member 24 on the outer peripheral side.

Furthermore, although not shown, the regulation portion 36 is provided below the rotary hearth 20, and the inner peripheral side of the roller 35a of the inner peripheral roller member 35 that supports the inner peripheral rail member 25 is provided. and the outer peripheral side, the restricting portion 36 is brought into contact with the inner peripheral side and the outer peripheral side of the rail member 25 located on the inner peripheral side supported by the roller member 35, and the rotating rotary hearth 20 It is also possible to regulate the position.

(Fourth embodiment)
Also in the fourth embodiment, the rotary hearth furnace X shown in FIG. 1 is used, and as shown in FIG. 9, a pair of The rail members 24 and 25 are provided in a ring shape with a required gap in the radial direction, and the pair of rail members 24 and 25 provided below the rotary hearth 20 on the installation base G that supports the rotary hearth 20 Ring-shaped roller members 34 and 35 are provided for supporting the respective rail members 24 and 25 of.

Here, in the fourth embodiment, at the end of the inner peripheral side of the rail member 24 located on the outer peripheral side provided under the rotary hearth 20, a roller member 34 that supports the rail member 24 is provided with A restricting portion 26 protruding downward is provided.

In the fourth embodiment, the workpiece W is set on the rotary hearth 20, and the rotary hearth 20 is surrounded between the inner peripheral side wall 11 and the outer peripheral side wall 12 as described above. When the workpiece W set on the rotary hearth 20 is rotated in the direction and heat-treated in the rotary hearth furnace X, the rotary hearth 20 is gradually deformed by the heat during the heat treatment, and the rotary furnace rotates. When the position of the bed 20 shifts in the radial direction and rotates eccentrically, before the rotary hearth 20 comes into contact with the inner peripheral side wall 11 and the outer peripheral side wall 12, the inner peripheral side end of the rail member 24 is lowered downward. The regulating portion 26 protruding outward comes into contact with the inner peripheral side of the roller 34a of the roller member 34 that supports the rail member 24, and the position of the rotating rotary hearth 20 is regulated.

As a result, in the fourth embodiment, as in the first to third embodiments, the rotating rotary hearth 20 is prevented from coming into contact with the inner peripheral side wall 11 and the outer peripheral side wall 12. , are prevented from being damaged, and the atmosphere and heat in the rotary hearth furnace X are prevented from leaking to the outside.

In the fourth embodiment, the roller member 34 that supports the rail member 24 is provided at the inner peripheral end of the rail member 24 located on the outer peripheral side under the rotary hearth 20 . Although the restricting portion 26 protruding downward is provided, as in the modification shown in FIG. A regulating portion 26 protruding downward toward the roller member 34 supporting the rail member 24 is provided, and before the rotary hearth 20 contacts the inner peripheral side wall 11 and the outer peripheral side wall 12, the outer circumference of the rail member 24 is prevented. The regulating portion 26 provided at the end of the side contacts the outer peripheral side of the roller 34a in the roller member 34 that supports the rail member 24, so that the position of the rotating rotary hearth 20 is regulated. It is possible.

Furthermore, although not shown, the regulating portion 26 is provided on the inner peripheral side and the outer peripheral side of the rail member 25 located on the inner peripheral side provided under the rotary hearth 20, and the regulating portion 26 is provided on this side. It is also possible to regulate the position of the rotating rotary hearth 20 by contacting the inner peripheral side and the outer peripheral side of the rollers 35 a of the roller members 35 that support the rail members 25 .

10: Furnace body 11: Inner peripheral side wall 12: Outer peripheral side wall 13: Ceiling 14a: Inner peripheral side water-sealed trough 14b: Outer peripheral side water-sealed trough 20: Rotary hearth 21: Roller member 21a: Roller 22: Roller member 22a: Roller 23: Regulating portion 24: Rail member 25: Rail member 26: Regulating portion 31: Rail member 32: Rail member 33: Regulating portion 34: Roller member 34a: Roller 35: Roller member 35a: Roller 36: Regulating portion G: Installation base W: Object to be processed X: Rotary hearth furnace d: Gap d1 between the regulating portion provided on the inner peripheral side of the roller and the inner peripheral side of the rail member: Gap d2 between the rotary hearth and the inner peripheral side wall: Rotary hearth and the outer peripheral wall

Claims (6)

A ring-shaped rotary hearth is provided between the inner peripheral side wall and the outer peripheral side wall in the furnace body provided with the inner peripheral side wall, the outer peripheral side wall, and the ceiling, and the rotary hearth is arranged as described above. In a rotary hearth furnace that rotates in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall of the rotary hearth, a roller member is provided in a ring shape under the rotary hearth, and on the installation base that supports the rotary hearth a ring-shaped rail member for supporting the roller member provided under the rotary hearth, and at least one of the roller member and the rail member is provided with the rotary hearth on the inner peripheral side wall and the outer peripheral side wall. A hearth structure of a rotary hearth furnace, characterized in that a regulating portion for regulating contact with any of the above is provided. 2. The hearth structure of a rotary hearth furnace according to claim 1, wherein a regulating portion is provided on at least one of the inner peripheral side and the outer peripheral side of the roller member, and when the rotary hearth is displaced in the radial direction, a hearth structure of a rotary hearth furnace, wherein the restricting portion is in contact with the rail member to restrict the rotary hearth from contacting either the inner peripheral side wall or the outer peripheral side wall; . 2. The hearth structure of a rotary hearth furnace according to claim 1, wherein a restricting portion is provided on at least one of the inner peripheral side and the outer peripheral side of the rail member, and when the rotary hearth is displaced in the radial direction, a hearth structure of a rotary hearth furnace, wherein the restricting portion is in contact with the roller member to restrict the rotary hearth from contacting either the inner peripheral side wall or the outer peripheral side wall; . A ring-shaped rotary hearth is provided between the inner peripheral side wall and the outer peripheral side wall in the furnace body provided with the inner peripheral side wall, the outer peripheral side wall, and the ceiling, and the rotary hearth is arranged as described above. In a rotary hearth furnace that rotates in the circumferential direction between the inner peripheral side wall and the outer peripheral side wall of the rotary hearth, a rail member is provided in a ring shape under the rotary hearth, and on the installation base that supports the rotary hearth A roller member supporting a rail member provided under the rotary hearth is provided in a ring shape, and at least one of the rail member and the roller member is provided with the rotary hearth on the inner peripheral side wall and the outer peripheral side wall. A hearth structure of a rotary hearth furnace, characterized in that a regulating portion for regulating contact with any of the above is provided. 5. The hearth structure of a rotary hearth furnace according to claim 4, wherein a regulating portion is provided on at least one of the inner peripheral side and the outer peripheral side of the roller member, and when the rotary hearth is displaced in the radial direction, a hearth structure of a rotary hearth furnace, wherein the restricting portion is in contact with the rail member to restrict the rotary hearth from contacting either the inner peripheral side wall or the outer peripheral side wall; . 5. The hearth structure of a rotary hearth furnace according to claim 4, wherein a restricting portion is provided on at least one of the inner peripheral side and the outer peripheral side of the rail member, and when the rotary hearth is displaced in the radial direction, a hearth structure of a rotary hearth furnace, wherein the restricting portion is in contact with the roller member to restrict the rotary hearth from contacting either the inner peripheral side wall or the outer peripheral side wall; .

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