CN114812165A

CN114812165A - Continuous firing furnace

Info

Publication number: CN114812165A
Application number: CN202210110322.6A
Authority: CN
Inventors: 冈岛上士; 中岛千浩
Original assignee: Noritake Co Ltd
Current assignee: Noritake Co Ltd
Priority date: 2021-01-29
Filing date: 2022-01-29
Publication date: 2022-07-29
Also published as: TW202234007A; JP6883718B1; JP2022116485A

Abstract

Provided is a continuous firing furnace which reduces the variation in the conveyance of an object to be treated. The continuous firing furnace includes a furnace body, a conveying roller, a supporting structure for the conveying roller, and a driving device. The furnace body has the 1 st side wall and the 2 nd side wall. The support structure of the conveying roller comprises: 1 st support frame; a 1 st support member rotatably supported by the 1 st support frame via a bearing, and supporting a 1 st end portion of the transport roller penetrating the 1 st side wall; a 2 nd support frame; and a 2 nd support member rotatably supported by the 2 nd support frame via a bearing, and supporting a 2 nd end portion of the transport roller penetrating the 2 nd side wall. A sprocket is attached to a 1 st supporting member of a part of the 1 st roller group among the plurality of conveying rollers, and the 1 st roller group is connected to a driving device. A sprocket is attached to a 2 nd supporting member of a 2 nd roller group other than the 1 st roller group among the plurality of conveying rollers, and the 2 nd roller group is connected to a driving device.

Description

Continuous firing furnace

Technical Field

The present disclosure relates to a continuous firing furnace.

Background

The continuous firing furnace is a firing furnace that continuously performs a heating process while conveying a material to be treated. The continuous firing furnace includes a firing furnace that performs heat treatment while conveying a treatment target by driving a plurality of conveying rollers to rotate. Such a continuous firing furnace is also called a roller kiln.

Japanese patent application publication No. 2019-172436 discloses a technique for adjusting and supporting the width of the inner peripheral surface of the end of a transport roller with respect to a support shaft that rotatably supports the transport roller. Japanese laid-open patent application publication No. 2010-43816 discloses a conveying roller support device for a heating furnace, which includes a support shaft and a support plate through which a cooling fluid can flow.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent application publication No. 2019-172436

Patent document 2: japanese patent application laid-open No. 2010-43816

Disclosure of Invention

Problems to be solved by the invention

In the roller kiln, the components in the furnace may be made of ceramics. By making the components in the furnace of ceramic, the metal foreign matter is prevented from being mixed in during firing. Further, the atmosphere in the furnace such as temperature and composition can be changed along the transport path. Therefore, the firing can be performed uniformly while controlling the atmosphere in the furnace. In the continuous firing furnace as described above, for example, particles used for semiconductor materials, battery active material materials, and the like are put into a container called a setter, transported, and fired at the same time. The setter can also be transported in multiple layers in an overlapping manner. By conveying a given unit in multiple layers, productivity can be improved.

In recent years, the demand of users who use continuous firing furnaces has been increasing. For example, it is required to miniaturize the object to be treated and to uniformly and appropriately fire the object, such as particles used for semiconductor materials, battery active material materials, and the like. In order to meet such a demand, granular objects to be treated are thinly arranged in a flat setter, and the setter is transported by a transport roller layer by layer and fired. As a result, the object to be treated, which is thinly arranged in the predetermined device, can be uniformly fired. When the throughput is increased, the setter may be arranged in a plurality of rows and conveyed by a conveying roller. On the other hand, after the inventors tried, the following tendency was found: when the processing objects are arranged in a plurality of rows and transported by the thin-walled setter, one row of the setters transported from the inlet reaches the outlet before the other row of the setters. In order to burn the object to be processed with desired accuracy and uniformity, it is also desirable that the conveyance speed of the setter to be conveyed does not vary greatly from the inlet to the outlet.

Means for solving the problems

The continuous firing furnace disclosed in one embodiment includes a furnace body, a plurality of conveying rollers, a supporting structure for the conveying rollers, and a driving device. The furnace body is a tunnel-shaped furnace body surrounding the linear conveying space. The continuous firing furnace comprises: a 1 st side wall provided on one side in the width direction of the conveyance space; and a 2 nd side wall provided on the opposite side of the 1 st side wall. The plurality of conveying rollers are arranged along a conveying direction set in the conveying space. Each of the plurality of conveying rollers is a cylindrical shaft-shaped roller, is arranged on the 1 st side wall and the 2 nd side wall, and penetrates through the 1 st side wall and the 2 nd side wall. The support structure of the conveying roller comprises: a 1 st support frame disposed outside the 1 st side wall; a 1 st support member rotatably supported by the 1 st support frame via a bearing, and supporting a 1 st end portion of the transport roller penetrating the 1 st side wall; a 2 nd support frame disposed outside the 2 nd side wall; and a 2 nd support member rotatably supported by the 2 nd support frame via a bearing, and supporting a 2 nd end portion of the transport roller penetrating the 2 nd side wall. A sprocket is attached to a 1 st supporting member of a part of the 1 st roller group among the plurality of conveying rollers, and the 1 st roller group is connected to a driving device. A sprocket is attached to a 2 nd supporting member of a 2 nd roller group other than the 1 st roller group among the plurality of conveying rollers, and the 2 nd roller group is connected to a driving device.

According to the continuous firing furnace, even when the objects to be processed are conveyed in a plurality of rows in the axial direction of the conveying roller, the conveying variation can be reduced.

The driving means may include a 1 st driving means connected to the 1 st support member of the 1 st roller group and a 2 nd driving means connected to the 2 nd support member of the 2 nd roller group.

The continuous firing furnace may include, in the transport direction, a region in which the transport rollers included in the 1 st roller group are adjacent to the transport rollers included in the 2 nd roller group.

The continuous firing furnace may include at least one of a region where the conveying rollers included in the plurality of 1 st roller groups are adjacent to each other and a region where the conveying rollers included in the plurality of 2 nd roller groups are adjacent to each other.

The support structure of the conveying roller may further include coil springs at both ends of the conveying roller. In this case, the coil springs may be disposed in a compressed state between the 1 st end surface of the transport roller and the 1 st support member and between the 2 nd end surface of the transport roller and the 2 nd support member, respectively.

The number of conveying rollers included in the 1 st roller group may be 0.4 or more and 0.6 or less of the total number of conveying rollers included in the 1 st roller group and the 2 nd roller group.

Drawings

Fig. 1 is a longitudinal sectional view schematically showing a continuous firing furnace 10.

Fig. 2 is a cross-sectional view of continuous burning furnace 10.

Fig. 3 is a schematic view showing a part of the side surface of the continuous firing furnace 10.

Fig. 4 is an enlarged view of the 1 st supporting member 21 supporting the conveyor roller 12.

Fig. 5 is an enlarged view of the 2 nd supporting member 22 supporting the conveying roller 12.

Fig. 6A is a schematic view of the continuous calcining furnace 10A.

Fig. 6B is a schematic view of continuous burning furnace 10.

Description of the reference numerals

10. A continuous firing furnace; 11. a furnace body; 11a, a conveying space; 11b, an inlet; 11c, an outlet; 12. a conveying roller; 12a, 1 st end; 12b, 2 nd end; 12A, a first roller group; 12B, a 2 nd roller set; 13. an object to be treated; 14. a base; 14a, a lower frame; 14b, a pillar frame; 14c, an upper side frame; 14d, feet; 16. enclosing plates; 16a, a heat insulating material; 21. 1 st support member; 21a, a basal end portion; 21b, a spring seat portion; 21c, an insertion shaft portion; 22. a 2 nd support member; 22a, a base end portion; 22b, a spring seat portion; 22c, an insertion shaft portion; 31. a furnace wall; 31a, 1 st side wall; 31b, 2 nd side wall; 32. a through hole; 34. a heater; 50. a support structure; 50a, a support structure (drive side); 50b, a support structure (driven side); 51. a substrate; 52. a pillar; 53. a support frame; 53a, No. 1 supporting frame; 53b, No. 2 support frame; 54. a cover; 55. mounting holes; 61. a coil spring; 64. a bearing; 65. a spacer; 66. a retainer ring; 68. a sprocket; 70. 70A, a power transmission mechanism; 71. a roller chain mechanism; 72. a power transmission unit; 81. a shaft; 82. 82a, a sprocket; 83. a roller chain; 90. a drive device (motor); 91. 94, 95, a coupling; 92. 97, a speed reducer; 93. 96, a clutch; 98. a handle; r1, region 1; r2, region 2; r3, region 3; r4, region 4.

Detailed Description

Hereinafter, one of exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following drawings, members and portions having the same functions are described with the same reference numerals. In addition, the dimensional relationships (length, width, thickness, etc.) in the drawings do not reflect actual dimensional relationships.

Fig. 1 is a longitudinal sectional view schematically showing a continuous firing furnace 10. Fig. 2 is a cross-sectional view of continuous burning furnace 10. The continuous firing furnace 10 is a so-called roller kiln. As shown in fig. 1 and 2, the continuous firing furnace 10 includes a furnace body 11, a plurality of conveyor rollers 12, a support structure 50 for the conveyor rollers 12, a power transmission mechanism 70, and a drive device 90. Fig. 2 schematically illustrates the support structure 50 of the conveying roller 12, the power transmission mechanism 70, and the drive device 90. In fig. 2, the furnace body 11 and the susceptor 14 are shown as different cross sections. In the furnace body 11, a cross section where the conveyor rolls 12 penetrate the furnace body 11 is shown. The base 14 is illustrated as having the power transmission mechanism 70 and a motor as the driving device 90. Fig. 3 is a schematic view showing a part of the side surface of the continuous firing furnace 10. In fig. 3, a roller chain mechanism 71 for driving the conveying rollers 12 of the continuous burning furnace 10 is illustrated.

Furnace body 11

As shown in fig. 1, the furnace body 11 is a tunnel-shaped furnace body surrounding a linear conveyance space 11 a. An inlet 11b for inputting the object to be processed 13 is provided on one side of the conveyance space 11 a. An outlet 11c for discharging the object to be processed 13 is provided on the opposite side of the conveyance space 11 a. The conveyance space 11a is set with a conveyance direction in which the object to be processed 13 is conveyed from the inlet 11b toward the outlet 11 c.

In this embodiment, the furnace body 11 has a furnace wall 31 surrounding the entire circumference around the conveying direction of the conveying space 11 a. The furnace wall 31 is made of a heat insulating material. The furnace wall 31 may be formed by overlapping ceramic fiber plates formed into a predetermined shape. The ceramic fiber sheet is, for example, a sheet formed by adding an inorganic filler and an inorganic/organic binder to a so-called bulk fiber and molding the resultant mixture into a sheet shape. The furnace wall 31 may be formed by stacking ceramic fiber plates in the thickness direction, for example. The furnace body 11 has a 1 st side wall 31a provided on one side in the width direction of the conveyance space 11a and a 2 nd side wall 31b provided on the side opposite to the 1 st side wall 31 a. The thickness of the furnace wall 31 is set to a thickness necessary to sufficiently insulate the heat of the conveyance space 11 a.

In the furnace body 11, a plurality of conveyance rollers 12 are arranged along the conveyance direction. In the 1 st side wall 31a and the 2 nd side wall 31b of the furnace body 11, through-holes 32 are formed in portions through which the respective conveying rollers 12 penetrate. The through-hole 32 has an inner diameter slightly larger than the outer diameter of the conveying roller 12. Further, long shaft-like conveyance rollers 12 are mounted on the 1 st side wall 31a and the 2 nd side wall 31 b. The conveying roller 12 penetrates the 1 st and 2

nd side walls

31a and 31 b.

Heater 34

As shown in fig. 1, a plurality of heaters 34 are disposed in the conveyance space 11a of the furnace body 11. The heater 34 is a device for heating the object to be processed 13 in the conveyance space 11 a. The plurality of heaters 34 are arranged above and below the conveyance space 11a with a predetermined interval in the conveyance direction so as to sandwich the plurality of conveyance rollers 12. In this embodiment, the heater 34 has a cylindrical shaft shape and penetrates the 1 st and 2

nd side walls

31a and 31 b. As the heater 34, various heaters can be used according to the heating temperature and the like, and for example, a ceramic heater can be used. In fig. 2, the heater 34 is not shown.

Foundation bed 14

As shown in fig. 2, in this embodiment, a furnace body 11 is mounted on a susceptor 14. The base 14 includes a lower frame 14a, a pillar frame 14b, and an upper frame 14 c. The lower frame 14a can be a base on which the driving device 90 is placed. The pillar frame 14b is a frame rising upward from the lower frame 14a, and a plurality of pillar frames are provided for the lower frame 14 a. The upper frame 14c is supported by the column frame 14b and can serve as a base on which the furnace body 11 is placed. The furnace body 11 includes the furnace wall 31 formed by stacking ceramic fiber plates as described above. The furnace wall 31 forms a linear long conveyance space 11 a. The plurality of susceptors 14 are linearly arranged to support the linearly long furnace wall 31. Further, the height adjustment is such that the heights of the bases 14 are aligned, respectively. For example, a height-adjustable foot 14d may be attached to the lower frame 14a of the base 14.

The base 14 is provided with a driving device 90 for driving the conveyance roller 12, and the like. Further outside, a shroud 16 surrounding an external device of the furnace body 11 is attached to the base 14. On the inner side of the shroud 16, a heat insulator 16a is attached so as to cover the outer side of the furnace body 11.

Conveyor roll 12

The conveying roller 12 is cylindrical shaft-shaped. The conveying roller 12 has a through-hole formed from one end toward the other end. In this embodiment, a hollow shaft made of ceramic is used as the conveying roller 12. The conveying roller 12 may be a tubular body having high heat resistance, such as alumina. The conveying rollers 12 may have a desired length to penetrate the 1 st and 2

nd side walls

31a and 31b of the furnace body 11 in the width direction. The inner diameter, outer diameter, and length of each conveying roller 12 are substantially the same except for allowable manufacturing errors.

The plurality of conveyance rollers 12 are disposed at a predetermined interval between the inlet 11b and the outlet 11c of the conveyance space 11a of the furnace body 11. As described above, the respective conveying rollers 12 are mounted on the 1 st side wall 31a and the 2 nd side wall 31b and penetrate the 1 st side wall 31a and the 2 nd side wall 31 b. Each of the conveying rollers 12 is supported by the 1 st supporting member 21 disposed outside the 1 st side wall 31a and the 2 nd supporting member 22 disposed outside the 2 nd side wall 31 b. The base 14 is provided with a support structure 50 for supporting the 1 st support member 21 and the 2 nd support member 22. Further, a power transmission mechanism 70 and a drive device 90 (motor) are mounted on the base 14.

Support structure 50

In this embodiment, as shown in fig. 2, the susceptor 14 is wider than the furnace body 11 in the width direction. The furnace body 11 is mounted at a predetermined position on the base 14. The furnace body 11 is placed substantially at the center in the width direction on the base 14. The end of the conveyor roller 12 protrudes in the width direction from the outer surface of the furnace body 11. The support structure 50 for supporting the conveyor rolls 12 is constructed outside the furnace body 11 in the width direction.

As shown in fig. 2 and 3, a cover 54 for maintaining the atmosphere in the furnace body 11 is attached to a side surface of the furnace body 11. The support structure 50 is received inside the cover 54. The support structure 50 includes a base 51 and a support frame 53. The base 51 is erected from a plurality of support columns 52 provided on the bottom surface of the cover 54. The plurality of pillars 52 are slightly spaced from the outer surface of the furnace body 11 outside the furnace body 11, and are arranged at predetermined intervals along the conveyance direction.

In fig. 4 and 5, a supporting member that supports the conveying roller 12 is schematically shown. The support structure 50 includes a 1 st support frame 53a, a 2 nd support frame 53b, a 1 st support member 21, and a 2 nd support member 22 (see fig. 2). The 1 st support frame 53a is disposed outside the 1 st side wall 31a of the furnace body 11. The 2 nd support frame 53b is disposed outside the 2 nd side wall 31b of the furnace body 11. The 1 st support member 21 is rotatably supported by the 1 st support frame 53a via a bearing 64. The 1 st supporting member 21 supports the 1 st end portion 12a of the conveying roller 12 penetrating the 1 st side wall 31 a. The 2 nd support member 22 is rotatably supported by the 2 nd support frame 53b via a bearing 64. The 2 nd supporting member 22 supports the 2 nd end portion 12b of the conveying roller 12 penetrating the 2 nd side wall 31 b.

Fig. 4 is an enlarged view of the 1 st supporting member 21 supporting the conveying roller 12. Fig. 5 is an enlarged view of the 2 nd supporting member 22 supporting the conveying roller 12. Fig. 4 shows a drive-side support structure 50a for the conveyance roller 12. Fig. 5 shows a support structure 50b on the driven side with respect to the conveying roller 12.

In this embodiment, as shown in fig. 2, the 1 st support frame 53a and the 2 nd support frame 53b are supported by the base 51 via the support columns 52, respectively. The 1 st support frame 53a and the 2 nd support frame 53b are frames that support a bearing 64, and the bearing 64 rotatably supports an end portion of the conveyor roller 12. The 1 st support frame 53a and the 2 nd support frame 53b are attached to the upper ends of the plurality of support columns 52 constituting the base 51. The 1 st support frame 53a and the 2 nd support frame 53b are provided at appropriate heights in terms of the height of the end portions of the support conveyor rolls 12 protruding from the outer surface of the furnace body 11. In this embodiment, the 1 st support frame 53a and the 2 nd support frame 53b are laterally long plate materials.

As shown in fig. 4 and 5, in the 1 st support frame 53a and the 2 nd support frame 53b, mounting holes 55 are formed in accordance with the interval at which the conveyance roller 12 is mounted to the furnace body 11, and the mounting holes 55 are to which support members for supporting the conveyance roller 12 are mounted. The 1 st support member 21 is attached to the attachment hole 55 of the 1 st support frame 53a via a bearing 64. The 2 nd support member 22 is attached to the attachment hole 55 of the 2 nd support frame 53b via a bearing 64. The inner diameter of the mounting hole 55 is set larger than the maximum outer diameter of the portions of the 1 st support member 21 and the 2 nd support member 22 disposed on the inner side of the support frame 53. The inner diameter of the mounting hole 55 is set larger than the outer diameter of the conveying roller 12.

The 1 st support member 21 and the 2 nd support member 22 are shaft-like members, and include

base end portions

21a and 22a,

spring seat portions

21b and 22b, and

insertion shaft portions

21c and 22c, respectively.

The base ends 21a and 22a are mounted to the mounting holes 55 of the support frames 53a and 53b via the bearings 64. The

base end portions

21a and 22a are provided with steps for positioning the bearing 64.

As shown in fig. 4, the base end portion 21a of the 1 st support member 21 on the 1 st side wall 31a side extends outward in the axial direction, and a sprocket 68 is attached to the end portion.

The

spring seat portions

21b and 22b are portions to which one end of the coil spring 61 is attached. The

spring seat portions

21b and 22b are disposed on the inner side of the support frame 53 in the 1 st support member 21 and the 2 nd support member 22. The

spring seat portions

21b and 22b are provided at axially inner ends of the

base end portions

21a and 22 a. The

spring seat portions

21b and 22b have portions having a diameter larger than the outer diameter of the coil spring 61. One end of the coil spring 61 abuts on this portion. The

spring seat portions

21b and 22b have a step slightly smaller in diameter than the inner diameter of the coil spring 61. The step penetrates the coil spring 61, and the coil spring 61 is attached to the 1 st support member 21 and the 2 nd support member 22.

The

insertion shaft portions

21c and 22c are portions that penetrate the coil spring 61 and partially penetrate the conveying roller 12. The

insertion shaft portions

21c, 22c are portions extending axially inward from the

spring seat portions

21b, 22 b. The diameters of the distal ends of the

insertion shaft portions

21c and 22c are increased in accordance with the inner diameter of the conveying roller 12. A minute gap for preventing these members from being broken due to thermal expansion is provided between the tip ends of the

insertion shaft portions

21c, 22c and the conveying roller 12.

The 1 st support member 21 is attached to the attachment hole 55 of the 1 st support frame 53a, and the 2 nd support member 22 is attached to the attachment hole 55 of the 2 nd support frame 53 b. In this embodiment, two bearings 64 are attached to the 1 st support member 21 and the 2 nd support member 22, respectively. A spacer 65 is provided between the two bearings 64. The bearing 64 is provided with a groove for mounting a retainer ring 66. The bearings 64 are respectively attached to the 1 st support member 21 and the 2 nd support member 22 so as to penetrate the support frame 53 and to be prevented from moving in the axial direction by the retainer ring 66. A slight gap for preventing these members from being broken due to thermal expansion is provided between the support frame 53 and the bearing 64.

As shown in fig. 4 and 5, the support structure 50 of the conveying roller 12 further includes coil springs 61 at both ends of the conveying roller 12. The conveying roller 12 is supported by the 1 st support member 21 and the 2 nd support member 22 by being partially penetrated inside the 1 st support member 21 and the 2 nd support member 22 and by being sandwiched by the coil springs 61 at both ends. Here, the

insertion shaft portions

21c and 22c penetrate the cylindrical shaft-shaped conveying roller 12 from both ends thereof.

The coil springs 61 are disposed in a compressed state between the 1 st end 12a of the conveying roller 12 and the 1 st supporting member 21 and between the 2 nd end 12b of the conveying roller 12 and the 2 nd supporting member 22, respectively. The coil spring 61 is a compression coil spring in a cylindrical shape. One end of the coil spring 61 abuts on the end of the conveying roller 12, and the other end of the coil spring 61 abuts on the

spring seat portions

21b and 22 b. The coil springs 61 are attached to the end portions of the conveying roller 12 and the

spring seat portions

21b, 22b of the 1 st and 2

nd support members

21, 22 in a compressed state at both ends of the conveying roller 12. The conveying roller 12 is held between the 1 st support member 21 and the 2 nd support member 22 by the elastic reaction force of the coil spring 61 in the compressed state, and is held by the 1 st support member 21 and the 2 nd support member 22.

In the conveying roller 12 shown in fig. 2, a driving-side supporting structure 50 for the conveying roller 12 is provided in the 1 st supporting member 21. Therefore, as shown in fig. 4, a sprocket 68 is attached to the base end portion 21a of the 1 st support member 21.

Power transmission mechanism 70

As shown in fig. 3, a power transmission mechanism 70 that transmits power for rotating the conveying roller 12 is provided on the side connected to the power transmission portion 72. In the power transmission mechanism 70 of this embodiment, a roller chain mechanism 71 and a power transmission unit 72 that transmits power of the drive device 90 (motor) to the roller chain mechanism 71 are used.

Roller chain mechanism 71

The roller chain mechanism 71 includes a sprocket 82 and a roller chain 83. As shown in fig. 3, the sprocket 82 is attached to the support column 52 and the support frame 53 provided on the base 14. The sprockets 82 mounted to the struts 52 and the support frame 53 form a closed loop. The roller chain 83 is wound around the loop. The sprockets 82 attached to the support column 52 and the support frame 53 are disposed inside and outside a loop around which the roller chain 83 is wound. Thus, a desired tension is applied to the roller chain 83. A sprocket 68 attached to a support member supporting the end of the conveyor roller 12 is supported by the support frame 53. In this embodiment, the roller chain 83 is configured to pass a loop below the sprocket 68 by a chain guide 84. Accordingly, the roller chain 83 rotates, so that the sprocket 68 and the supporting member rotate, and the conveying roller 12 rotates.

As shown in fig. 2, the power transmission unit 72 is a mechanism for transmitting power of the motor 90 to the roller chain 83. In this embodiment, the power transmission unit 72 transmits the power of the motor 90 to the sprocket 82a around which the roller chain 83 is wound. The power transmission unit 72 includes

couplings

91 and 94, a speed reducer 92, and a clutch 93.

In this embodiment, a part of the loop around which the roller chain 83 is wound passes through a space between the upper frame 14c and the lower frame 14a of the base 14. At this location, a sprocket 82a is attached.

A shaft 81 is attached to the sprocket 82 a. One end of a clutch 93 is attached to one side of the shaft 81 via a coupling 94. A speed reducer 92 is attached to the other end of the clutch 93, and a drive device 90 (motor) is attached via a coupling 91.

The clutch 93 connects or disconnects the shaft 81 on which the sprocket 82a is mounted and the reduction gear 92 connected to the motor 90. The shaft 81 to which the sprocket 82a is attached rotates independently of the motor 90 by the clutch 93 being disengaged. One end of a clutch 96 is attached to the shaft 81 to which the sprocket 82a is attached via a coupling 95 on the side opposite to the side on which the clutch 93 is provided. A handle 98 is provided at the other end of the clutch 96 via a reduction gear 97. In this embodiment, the handle 98 is configured to be attachable and detachable, and is normally detachable during operation. The handle 98 is attached when the conveying roller 12 is manually rotated in maintenance or the like, for example. The clutch 96 is switched to connect and disconnect the handle 98 to and from the shaft 81 to which the sprocket 82a is attached.

Fig. 6A is a schematic view of continuous firing furnace 10A. In the continuous firing furnace 10A shown in fig. 6A, the power transmission mechanism 70A is concentrated outside one furnace wall. Since the power transmission mechanism 70A is concentrated on the outer side of the one furnace wall, a desired support member and a conveyance roller can be detached from the driven side without adjusting the power transmission mechanism 70A. Further, since the power transmission mechanism 70A is concentrated on the outer side of the furnace wall on one side, even when a problem occurs in the drive mechanism, detection and repair can be performed from one side. In this way, the continuous calcining furnace 10A has a structure for efficiently performing maintenance work and the like. In fig. 6A, the conveying rollers and the like are not shown.

In the continuous firing furnace 10A, a small gap is provided between the conveying roller and the support member, and between the support frame and the bearing, to alleviate thermal expansion. When the object to be processed is conveyed, the conveying roller presses the object to be processed against the supporting member vertically downward at all times. Therefore, the conveying roller rotates in a state of being constantly pressed vertically downward against the support member. Therefore, even if the objects to be processed are conveyed in a plurality of rows arranged in the axial direction of the conveyor roller 12, a speed difference in conveyance of the objects to be processed is unlikely to occur. However, it is known that when a setter on which objects to be processed are thinly arranged is conveyed in a plurality of rows in the axial direction of the conveyor roller, a speed difference in conveyance of the objects to be processed occurs. In particular, the driven-side conveying speed of the conveying roller tends to be higher than the driving-side conveying speed of the conveying roller. The arrows in fig. 6 show the tendency of the conveyance speed in the case where the setter on which the objects to be processed are arranged thinly is conveyed in a plurality of rows in the axial direction of the conveyance roller, and longer arrows indicate that the conveyance speed is faster. The arrow does not strictly indicate the magnitude of the conveyance speed.

In view of this phenomenon, the present inventors considered that the reason for this is that, when the object to be processed placed on the transport roller is light, the contact between the transport roller and the 1 st supporting member and the contact between the transport roller and the 2 nd supporting member become unstable. That is, when a light object to be processed is conveyed, the force with which the conveying roller is pressed against the support member vertically downward is weak. Therefore, the conveying roller may not always be pressed against the support member in the vertically downward direction, but may rotate eccentrically with respect to the support member. The drive-side support member is coupled to the drive device via a sprocket. Therefore, on the drive side, the conveying roller is likely to be in contact with the support member at the same position all the time in the circumferential direction. Therefore, the vibration of the conveying roller during rotation is small. On the driven side, on the other hand, the support member is not constrained by the drive device. Therefore, the position at which the conveying roller contacts the support member when rotating rotates variably in the circumferential direction. As a result, the end of the driven conveying roller tends to vibrate more greatly than the driving conveying roller. As a result, the conveying speed on the driven side is faster than the conveying speed on the driving side. When the object to be processed placed on the conveying rollers becomes light, vibration of the end of the conveying roller on the driven side becomes large, and the conveying speed tends to become high on the driven side. The present inventors conceived such a mechanism in view of a tendency that the conveying speed of the object to be processed placed closer to the driven side becomes faster as the object to be processed placed on the conveying roller becomes lighter.

1

st roll group

12A and 2 nd roll group 12B

Fig. 6B is a schematic view of continuous burning furnace 10. Fig. 6B illustrates a position where the power transmission mechanism 70 is provided in the continuous burning furnace 10, and the conveying rollers 12 and the like are not illustrated. The power transmission mechanism 70 shown in fig. 6B is similar to the power transmission mechanism 70 shown in fig. 3.

In the continuous burning furnace 10, some of the plurality of conveyor rolls 12 constitute the 1 st roller group 12A to which the sprocket 68 is attached to the 1 st support member 21 on the 1 st side wall 31a side and which is connected to the driving device 90. A driving-side support structure 50a is formed at an end of the conveying rollers 12 constituting the 1 st roller group 12A on the 1 st side wall 31a side. A driven-side support structure 50b is formed at the end of the 2 nd side wall 31 a.

The conveyor rollers 12 other than the 1 st roller group 12A among the plurality of conveyor rollers 12 constitute a 2 nd roller group 12B to which the sprocket 68 is attached to the 2 nd supporting member 22 on the 2 nd side wall 31B side and which is connected to the driving device 90. A driven-side support structure 50B is formed at the end of the conveying rollers 12 constituting the 2 nd roller group 12B on the 1 st side wall 31a side. A driving-side support structure 50a is formed at the end of the 2 nd side wall 31 b.

The 2 nd roller group 12B may not be all of the rollers 12 other than the 1 st roller group 12A among the plurality of rollers 12. The continuous burning furnace 10 may include, for example, the conveyor rollers 12 that are driven from neither the 1 st side wall 31a nor the 2 nd side wall 31B and are included in neither the 1 st nor the 2

nd roller group

12A or 12B.

The 1 st roll group 12A and the 2 nd roll group 12B are driven by different driving devices, respectively. A 1 st driving device is connected to the 1 st support member 21 of the 1 st roller group, and the 1 st driving device drives the conveying rollers 12 included in the 1 st roller group from the outside of the 1 st side wall 31 a. A 2 nd driving device is connected to the 2 nd support member 22 of the 2 nd roller group, and the 2 nd driving device drives the conveying rollers 12 included in the 2 nd roller group from the outside of the 2 nd side wall 31 b.

The continuous burning furnace 10 includes a 1 st region R1 to a 4 th region R4 along the conveying direction.

Among them, in the 1 st region R1 and the 3 rd region R3, the sprocket 68 is mounted to the 1 st supporting member 21 of the 1 st supporting frame 53a mounted on the 1 st side wall 31a side. In the 2 nd region R2 and the 4 th region R4, the sprocket 68 is attached to the 2 nd support member 22 attached to the 2 nd support frame 53b on the 2 nd side wall 31b side.

In other words, in the continuous burning furnace 10, the plurality of conveying rollers 12 included in the 1 st roller group 12A are adjacent to each other in the 1 st region R1 and the 3 rd region R3. Further, in the 2 nd region R2 and the 4 th region R4, the plurality of conveying rollers 12 included in the 2 nd roller group 12B are adjacent.

As shown in fig. 3, roller chains 83 are respectively hung on the sprockets 68, and the roller chains 83 are connected to the power transmission portion 72. The power of the motor 90 of the power transmission portion 72 is transmitted to the sprocket 68 of the 1 st supporting member 21 by the roller chain 83. Therefore, in the 1 st region R1 and the 3 rd region R3 adjacent to the conveying rollers 12 included in the 1 st roller group 12A, the 1 st side wall 31a side becomes the driving side. In the 2 nd region R2 and the 4 th region R4 adjacent to the conveying rollers 12 included in the 2 nd roller group 12B, the 2 nd side wall 31B side becomes the driving side.

When conveying a plurality of rows of the light objects to be processed 13, the conveying speed of the conveying rollers 12 on the 2 nd side wall 31b side is faster than the conveying speed on the 1 st side wall 31a side in the 1 st region R1 and the 3 rd region R3. In the 2 nd region R2 and the 4 th region R4, the conveying speed on the 1 st side wall 31a side is faster than the conveying speed on the 2 nd side wall 31b side in the conveying rollers 12. As a result, even when the light objects to be treated 13 are conveyed in a plurality of rows in the axial direction of the conveyance roller as a whole in the continuous firing furnace 10, the conveyance speeds on the 1 st side wall 31a side and the 2 nd side wall 31b side can be adjusted to be the same. Therefore, the conveyance deviation between the object 13 conveyed on the 1 st side wall 31a side and the object 13 conveyed on the 2 nd side wall 31b side is small.

In this way, in the continuous calcining furnace 10, in the 1 st roller group 12A including some of the plurality of conveyor rollers 12, the sprocket 68 is attached to the 1 st supporting member 21 on the 1 st side wall 31a side, and the driving device 90 may be connected thereto. In the 2 nd roller group 12B including the rollers 12 other than the 1 st roller group 12A among the plurality of rollers 12, the sprocket 68 may be attached to the 2 nd support member 22 on the 2 nd side wall 31B side and connected to the driving device 90. By dividing the support structure 50a of the drive conveyor 12 of the continuous firing furnace 10 into the 1 st side wall 31a side and the 2 nd side wall 31b side, it is possible to reduce conveyance deviation between the object to be treated 13 conveyed on the 1 st side wall 31a side and the object to be treated 13 conveyed on the 2 nd side wall 31b side. This suppresses the conveyance problem caused by the conveyance variation, and can stably and continuously burn the object to be treated 13.

In order to match the conveyance speeds of the objects to be treated 13 on the 1 st side wall 31a side and the 2 nd side wall 31B side, in the continuous baking furnace 10, it is preferable that the number of the conveyor rollers 12 included in the 1 st roller group 12A is approximately the same as the number of the conveyor rollers 12 included in the 2 nd roller group 12B. For example, the number of the conveyor rollers 12 included in the 1 st roller group 12A is preferably 0.4 or more and 0.6 or less, more preferably 0.45 or more and 0.55 or less, and the closer to 0.5, the more preferable the number is, the total number of the conveyor rollers 12 included in the 1 st roller group 1A and the 2 nd roller group 12B is.

As described above, the conveying roller 12 is supported by the driving-side support structure 50a and the driven-side support structure 50b, and is rotationally driven by the power transmission mechanism 70. When the conveying roller 12 having such a structure needs to be removed in maintenance work or the like, the conveying roller 12 can be removed from a driven side where the roller chain mechanism 71 is not provided. The continuous firing furnace 10 includes a region in which the 1 st roll group is adjacent (the 1 st region R1 and the 3 rd region) and a region in which the 2 nd roll group is adjacent (the 2 nd region R1 and the 4 th region). Thereby, the transport roller can be detached simultaneously from the same side for each area. In addition, even when a problem occurs in the drive mechanism, detection and repair can be performed from one side. By thus concentrating the drive mechanism for each area, maintenance work and the like can be efficiently performed.

Further, regions (1 st region R1 and 3 rd region) adjacent to the conveyor rollers 12 included in the 1 st roller group 12A and regions (2 nd region R1 and 4 th region) adjacent to the conveyor rollers 12 included in the 2 nd roller group 12B are alternately arranged in the conveying direction. This can reduce the conveyance variation in the conveyance space 11 a. For example, even when the atmosphere is switched by a shutter or the like for each of the region where the 1 st roller group is adjacent and the region where the 2 nd roller group is adjacent, the problem of conveyance in the conveyance space 11a can be reduced.

In the above embodiment, the continuous firing furnace 10 includes the 1 st region R1 to the 4 th region R4. The conveyor rollers 12 included in the 1 st roller group 12A are adjacent to each other in the 1 st region R1 and the 3 rd region R3, and the conveyor rollers 12 included in the 2 nd roller group 12B are adjacent to each other in the 2 nd region R2 and the 4 th region R4. However, the present invention is not limited to this embodiment unless otherwise specified. For example, such a region may be included in which the conveyor rollers 12 included in the 1 st roller group 12A and the conveyor rollers 12 included in the 2 nd roller group 12B are alternately arranged.

In the above embodiment, the conveying rollers 12 and the heater 34 are provided in the furnace body 11. However, in the continuous firing furnace 10, various structures can be added to the inside and outside of the furnace body 11. For example, the continuous burning furnace 10 may be provided with a mechanism such as an air supply pipe and an exhaust pipe for controlling the atmosphere in the furnace body 11. A gas tank capable of supplying nitrogen, argon, or the like can be attached to the gas supply pipe. A vacuum pump, an exhaust gas treatment device, and the like can be attached to the exhaust pipe. The continuous firing furnace 10 may also include a partition, a shutter, and the like for dividing the atmosphere in the furnace body 11.

Although the above description has been given in detail with reference to specific embodiments, these embodiments are merely examples and do not limit the claims. As described above, the technology recited in the claims includes various modifications and changes to the above-described embodiments. In addition, some of the techniques exemplified in the above embodiments can be applied to a continuous firing furnace.

Claims

1. A continuous firing furnace, wherein,

the continuous firing furnace includes:

a furnace body;

a plurality of conveying rollers;

a support structure for the feed roller; and

a driving device for driving the motor to rotate,

the furnace body is a tunnel-shaped furnace body surrounding a linear conveying space, and is provided with:

a 1 st side wall provided on one side in the width direction of the conveyance space; and

a 2 nd side wall provided on the opposite side of the 1 st side wall,

the plurality of conveying rollers are arranged along a conveying direction set in the conveying space,

each of the plurality of transport rollers is a cylindrical shaft-shaped roller, is arranged on the 1 st side wall and the 2 nd side wall, and penetrates through the 1 st side wall and the 2 nd side wall,

the support structure of the conveying roller includes:

a 1 st support frame disposed outside the 1 st side wall;

a 1 st support member rotatably supported by the 1 st support frame via a bearing, the 1 st support member supporting a 1 st end portion of the transport roller, the 1 st end portion penetrating the 1 st side wall;

a 2 nd support frame disposed outside the 2 nd side wall; and

a 2 nd support member rotatably supported by the 2 nd support frame via a bearing, the 2 nd support member supporting a 2 nd end portion of the transport roller penetrating the 2 nd side wall,

a part of the 1 st roller group of the plurality of conveying rollers is provided with a chain wheel on the 1 st supporting member and is connected with the driving device,

the 2 nd roller group other than the 1 st roller group among the plurality of conveying rollers is attached with a sprocket on the 2 nd supporting member and is connected to the driving device.

2. The continuous firing furnace according to claim 1, wherein,

the drive means includes a 1 st drive means connected to the 1 st support member of the 1 st roller set and a 2 nd drive means connected to the 2 nd support member of the 2 nd roller set.

3. The continuous firing furnace according to claim 1 or 2, wherein,

the continuous firing furnace includes, in the transport direction, a region adjacent to the transport rollers included in the 1 st roller group and a region adjacent to the transport rollers included in the 2 nd roller group.

4. Continuous firing furnace as claimed in claim 3,

the continuous furnace includes at least one of a region adjacent to the transport rollers included in the 1 st roller group and a region adjacent to the transport rollers included in the 2 nd roller group.

5. The continuous firing furnace according to claim 1 or 2, wherein,

the support structure of the conveying roller further includes coil springs at both ends of the conveying roller,

the coil springs are respectively disposed in a compressed state between an end surface of a 1 st end portion of the conveying roller and the 1 st supporting member and between an end surface of a 2 nd end portion of the conveying roller and the 2 nd supporting member.

6. The continuous firing furnace according to claim 1 or 2, wherein,

the number of conveying rollers included in the 1 st roller group is 0.4 to 0.6 of the sum of the number of conveying rollers included in the 1 st roller group and the 2 nd roller group.