An apparatus for producing a shoe with a sole and an upper

Abstract

The present application relates to the technical field of shoemaking equipment, in particular to a vamp and sole compaction device for production, which comprises a base, a support is welded on the outer wall of the top of one side of the base, a motor is welded on the outer wall of the support, a rotating frame is welded on the main shaft of the motor, and a pulley transmission group is arranged between the outer wall of the end of the rotating frame away from the motor and the outer wall of the base. In the present application, when the vamp part and the sole part are fitted, the pressing block can press the heel part, the moving frame can drive the rollers to roll from the heel to the toe, and the vamp part and the sole part are more fully fitted. Through the arrangement of the feeding groove and the conveying belt, workers only need to stack the sole parts in the feeding box and arrange the vamp parts in the feeding groove during work, so that automatic feeding can be realized, the automation effect is greatly improved, and the batch production demand can be met.

Description

Technical Field

[0001] This invention belongs to the field of shoe manufacturing equipment technology, specifically relating to a shoe upper and sole compaction device for production. Background Technology

[0002] Since the sole and upper are produced separately, they need to be glued together to obtain the finished shoe. Therefore, a compaction device is required to press the sole and upper together.

[0003] However, the existing compaction device has uneven pressure distribution, with the pressure mainly concentrated in the heel area, which makes it easy for the toe area to be insufficiently compacted. Furthermore, the existing compaction device cannot meet the needs of mass production. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the background art by providing a shoe upper and sole compaction device for production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A shoe upper and sole compaction device for production includes a base. A bracket is welded to the top outer wall of one side of the base. A motor is welded to the outer wall of the bracket. A rotating frame is welded to the main shaft of the motor. A pulley drive assembly is provided between the outer wall of the rotating frame away from the motor and the outer wall of the base. A pair of tensioning pulleys are rotatably inserted into the inner wall of the base. A conveyor belt is fitted onto the outer wall of the pair of tensioning pulleys. Several equally spaced linearly distributed shoe grooves are formed on the outer wall of the conveyor belt. The tensioning pulleys are close to the pulleys... A gear transmission group is provided between the outer wall of one end of the moving assembly and the pulley transmission group. Several equally spaced circumferentially distributed threaded tubes are welded on the outer wall of the rotating frame. The threaded tubes correspond to the shoe grooves. Each time the rotating frame rotates one tube position, the conveyor belt moves one groove position. A shaped column is slidably inserted into each threaded tube. A spring is provided between the end wall of each shaped column and the inner wall of the threaded tube. A pressure block is welded on the outer wall of the end of each shaped column away from the spring. A rolling mechanism is provided on the shaped column.

[0007] In the above-mentioned shoe upper and sole compaction device for production, a feeding box is welded to the top outer wall of the base away from the support. The bottom of the feeding box is attached to the conveyor belt. The shoe groove can only accommodate one sole thickness. An inclined feeding trough is welded to the top outer wall of the feeding box. A pair of clamps are slidably inserted into the outer wall of the feeding trough near the support. A spring is provided between the outer wall of each clamp and the outer wall of the feeding trough.

[0008] In the above-mentioned shoe upper and sole compaction device for production, a limiting plate is welded on the outer wall of the end of the bracket away from the feeding box, a limiting block is slidably inserted into the outer wall of the limiting plate, a spring is provided between the outer wall of the limiting block and the outer wall of the limiting plate, the limiting block is adapted to the shoe upper, and a feeding groove is provided below the limiting plate.

[0009] In the above-mentioned shoe upper and sole compaction device for production, each of the threaded tubes is rotatably inserted with a threaded sleeve through threaded engagement, and a switching gear is welded to the outer wall of the end of each threaded sleeve. A gear ring segment one and a gear ring segment two are welded to the outer walls on both sides of the bracket, and the gear ring segment one and the gear ring segment two are adapted to the switching gear. The threaded sleeve is fitted onto the outer wall of the irregular column.

[0010] In the aforementioned shoe upper and sole compaction device for production, the rolling mechanism includes an abutment sleeve. Each of the irregularly shaped columns has a groove on its outer wall. Each groove has a limit rod welded inside it. Each limit rod has an abutment sleeve slidably fitted onto its outer wall. A spring is welded between the outer wall of the end of each abutment sleeve and the inner wall of the groove. A baffle is welded to the outer wall of the end of each abutment sleeve away from the spring. Each baffle abuts against a switching gear. A telescopic rod is welded to the outer wall of each pressing block.

[0011] In the above-mentioned shoe upper and sole compaction device for production, a movable frame is welded to the outer wall of the end of each telescopic rod, and a roller is rotatably inserted into the inner wall of each movable frame. The outer wall contour of each roller is flush with the end wall of the pressing block.

[0012] In the above-mentioned shoe upper and sole compaction device for production, an arc-shaped connecting rod is rotatably inserted into the outer wall of each abutment sleeve, and the end of each connecting rod away from the abutment sleeve is rotatably inserted into the outer wall of the movable frame.

[0013] In the above-mentioned shoe upper and sole compaction device for production, each of the irregularly shaped columns has a support plate 1 rotatably inserted into the end near the pressure block, the support plate 1 being adapted to the pressure block, and a support plate 2 rotatably inserted into the outer wall of the end of each support plate 1 away from the irregularly shaped column, and a stop block is welded onto the outer wall of the end of each support plate 1 away from the irregularly shaped column, the stop block being adapted to the support plate 2.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. Through the setting of the feeding trough and conveyor belt, whenever the motor drives the rotating frame to rotate one tube position, the gear transmission group can drive the transmission belt to rotate one trough position under the action of the pulley transmission group. Whenever the shoe trough is aligned with the feeding box, the shoe soles stacked in the feeding box will fall into the shoe trough, realizing the effect of automatic feeding of shoe soles. Whenever the rotating frame drives the irregular column to rotate to the end of the feeding trough, the irregular column drives the support plate one and support plate two to insert into the shoe upper, thereby simulating the effect of wearing shoes, so that the shoe upper can be fitted on the rolling mechanism and rotated to fit with the shoe sole. Whenever the shoe upper at the end of the feeding trough is disengaged, the subsequent shoe upper will slide to the end of the feeding trough and be fixed by the clamp, preparing for the subsequent shoe upper feeding. During operation, the worker only needs to stack the shoe soles in the feeding box and arrange the shoe uppers in the feeding trough to realize automatic feeding, which greatly improves the automation effect and can meet the needs of mass production.

[0016] 2. Through the set rolling mechanism, whenever the irregular column drives the shoe upper to rotate to the lowest point, under the interception of the conveyor belt, the irregular column will gradually slide into the threaded tube. The irregular column compresses the spring, so that the pressure block can press the heel. Under the action of the gear interception sleeve, the pressure block drives the moving frame to gradually approach the sleeve, so that the connecting rod gradually pushes the moving frame away from the pressure block. Under the action of the telescopic rod, the roller always remains tangent to the end wall of the pressure block, so that the moving frame can drive the roller to roll from the heel to the toe, thereby making the shoe upper and the sole more fully pressed.

[0017] In summary, the designed rolling mechanism allows the pressure block to press the heel when the upper and sole are in contact, while the moving frame drives the rollers to roll from the heel to the toe, resulting in a more thorough fit between the upper and sole. The feeding trough and conveyor belt enable workers to simply stack the soles in the feeding box and arrange the uppers in the feeding trough for automatic feeding, significantly improving automation and meeting the needs of mass production. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a three-dimensional schematic diagram of the base of the present invention.

[0020] Figure 3 This is a three-dimensional schematic diagram of the conveyor belt of the present invention.

[0021] Figure 4 This is a three-dimensional cross-sectional view of the threaded tube of the present invention.

[0022] Figure 5 This is a three-dimensional schematic diagram of the irregular-shaped column of the present invention.

[0023] Figure 6 This is a three-dimensional schematic diagram of the support plate of the present invention.

[0024] Figure 7 This is a planar schematic diagram of the working state of the rolling mechanism of the present invention.

[0025] Figure 8 This is a planar schematic diagram of the shoe removal and unloading state of the present invention.

[0026] Figure 9 This is a planar schematic diagram of the shoe-wearing and material-loading state according to the present invention.

[0027] In the diagram: 1. Base; 11. Feeding box; 111. Feeding trough; 112. Clamping plate; 113. Spring 2; 12. Discharge trough; 13. Bracket; 131. Gear ring section 1; 132. Gear ring section 2; 14. Limiting plate; 141. Limiting block; 142. Spring 3; 2. Rotating frame; 21. Motor; 22. Pulley drive assembly; 23. Threaded pipe; 3. Conveyor belt; 31. Shoe groove; 32. Tensioner 33. Gear transmission assembly; 4. Switching gear; 41. Threaded sleeve; 5. Irregular column; 51. Spring 1; 52. Pressure block; 521. Telescopic rod; 522. Moving frame; 523. Roller; 53. Slide groove; 531. Limiting rod; 6. Abutment sleeve; 61. Baffle; 62. Spring 4; 63. Connecting rod; 7. Support plate 1; 71. Stop block; 72. Support plate 2; 9. Upper part of shoe; 91. Sole of shoe. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] Please see Figures 1-9This invention provides a technical solution comprising: a base 1, a bracket 13 welded to the top outer wall of one side of the base 1, a motor 21 welded to the outer wall of the bracket 13, a rotating frame 2 welded to the main shaft of the motor 21, a pulley drive assembly 22 disposed between the outer wall of the rotating frame 2 away from the motor 21 and the outer wall of the base 1, a pair of tensioning wheels 32 rotatably inserted into the inner wall of the base 1, a conveyor belt 3 fitted onto the outer wall of the pair of tensioning wheels 32, a plurality of equally spaced linearly distributed shoe grooves 31 formed on the outer wall of the conveyor belt 3, a gear drive assembly 33 disposed between the outer wall of the tensioning wheel 32 near the pulley drive assembly 22 and the pulley drive assembly 22, and a plurality of equally spaced circumferentially distributed threaded tubes 23 welded to the outer wall of the rotating frame 2, the threaded tubes 23 corresponding to the shoe grooves 31, and the rotating frame... 2. For each rotation of a pipe position, the conveyor belt 3 moves one slot position. A shaped column 5 is slidably inserted into each threaded pipe 23. A spring 51 is provided between the end wall of each shaped column 5 and the inner wall of the threaded pipe 23. A pressure block 52 is welded to the outer wall of the end of each shaped column 5 away from the spring 51. A rolling mechanism is provided on the shaped column 5. A feeding box 11 is welded to the top outer wall of the end of the base 1 away from the support 13. The bottom of the feeding box 11 is in contact with the conveyor belt 3. The shoe groove 31 can only accommodate one shoe sole thickness. An inclined feeding groove 111 is welded to the top outer wall of the feeding box 11. A pair of clamps 112 are slidably inserted into the outer wall of the feeding groove 111 near the support 13. A spring 113 is provided between the outer wall of each clamp 112 and the outer wall of the feeding groove 111.

[0031] When the motor 21 drives the rotating frame 2 to rotate, the gear transmission group 33 can drive the conveyor belt 3 to rotate under the action of the pulley transmission group 22. The transmission ratio of the pulley transmission group 22 and the gear transmission group 33 needs to ensure that whenever the motor 21 drives the rotating frame 2 to rotate one tube position, the conveyor belt 3 rotates one slot position accordingly. In the initial state, the lowest threaded tube 23 is perpendicular to the conveyor belt 3, and the pressure block 52 on the irregular column 5 inside the threaded tube 23 is located at the root of the shoe groove 31 below.

[0032] To further elaborate on the above: The rotating frame 2 and conveyor belt 3 are driven by motor 21. Whenever the conveyor belt 3 aligns the shoe groove 31 with the feeding box 11, the stacked shoe soles 91 in the feeding box 11 fall into the shoe groove 31. Each shoe groove 31 can only hold one shoe sole 91, ensuring that subsequent shoe soles 91 fall sequentially into the subsequent empty shoe grooves 31, achieving automatic feeding of the shoe soles 91. After the conveyor belt 3 moves the shoe sole 91 out from under the feeding box 11, glue is sprayed onto the shoe sole 91 using a glue spraying device (not shown in the diagram). Whenever the rotating frame 2 drives the irregularly shaped column 5 to rotate to the end of the feeding groove 111... The irregular column 5 drives the support plate 1 7 and support plate 2 72 to insert into the shoe upper 9, thereby simulating the effect of putting on the shoe and feeding it. This allows the shoe upper 9 to be fitted onto the rolling mechanism and rotate to fit against the shoe sole 91. Whenever the shoe upper 9 at the end of the feeding groove 111 is disengaged, the subsequent shoe upper 9 will slide to the end of the feeding groove 111 and be fixed by the clamp 112, preparing for the feeding of the subsequent shoe upper 9. During operation, the worker only needs to stack the shoe sole 91 in the feeding box 11 and arrange the shoe upper 9 in the feeding groove 111 to achieve automatic feeding, which greatly improves the automation effect and can meet the needs of mass production.

[0033] Specifically, a limiting plate 14 is welded to the outer wall of the end of the bracket 13 away from the feeding box 11. A limiting block 141 is slidably inserted into the outer wall of the limiting plate 14. A spring 142 is provided between the outer wall of the limiting block 141 and the outer wall of the limiting plate 14. The limiting block 141 is adapted to the shoe upper. A feeding groove 12 is provided below the limiting plate 14. A threaded sleeve 41 is rotatably inserted into each threaded tube 23 through threaded engagement. A switching gear 4 is welded to the outer wall of the end of each threaded sleeve 41. A gear ring segment 131 and a gear ring segment 22 are welded to the outer walls on both sides of the bracket 13, respectively. Both gear ring segment 131 and gear ring segment 2132 are adapted to the switching gear 4. The threaded sleeve 41 is fitted onto the outer wall of the irregular column 5.

[0034] Both gear ring segment 131 and gear ring segment 132 can make the switching gear 4 rotate half a revolution. The switching gear 4 drives the threaded sleeve 41 to rotate. When the meshing stroke of the switching gear 4 ends, the threaded sleeve 41 can self-lock under the action of the threaded engagement. Under the action of the irregular contour of the irregular column 5, the threaded sleeve 41 can drive the irregular column 5 to rotate and limit its movement.

[0035] To further elaborate on the above: After the upper part 9 and the sole 91 are pressed together, as the rotating frame 2 continues to rotate, the irregular column 5 drives the finished shoe closer to the limiting block 141. The limiting block 141 can intercept the heel. As the irregular column 5 gradually rises and is pulled away, it simulates the action of taking off the shoe, realizing the effect of the finished shoe being taken off and unloaded. The finished shoe falls into the unloading trough 12 and is collected. After unloading is completed, the switching gear 4 meshes with the first gear ring segment 131, causing the rolling mechanism to rotate half a turn, preparing for the upper part 9 to be put on the shoe. After the upper part 9 is put on the shoe, the switching gear 4 meshes with the second gear ring segment 132, causing the rolling mechanism to rotate and reset, preparing for the upper part 9 to be bonded to the sole 91.

[0036] Specifically, the rolling mechanism includes an abutment sleeve 6. Each irregularly shaped column 5 has a groove 53 on its outer wall. A limit rod 531 is welded into each groove 53. An abutment sleeve 6 is slidably fitted onto the outer wall of each limit rod 531. A spring 62 is welded between the outer wall of the end of each abutment sleeve 6 and the inner wall of the groove 53. A baffle 61 is welded onto the outer wall of the end of each abutment sleeve 6 away from the spring 62. Each baffle 61 abuts against a switching gear 4. A telescopic rod 521 is welded onto the outer wall of each pressure block 52. A movable frame 522 is welded onto the outer wall of the end of each telescopic rod 521. Each movable frame 522... Rollers 523 are rotatably inserted into the inner wall of each roller 523. The outer contour of each roller 523 is flush with the end wall of the pressure block 52. An arc-shaped connecting rod 63 is rotatably inserted into the outer wall of each abutment sleeve 6. The end of each connecting rod 63 away from the abutment sleeve 6 is rotatably inserted into the outer wall of the movable frame 522. A support plate 7 is rotatably inserted into the end of each irregular column 5 near the pressure block 52. The support plate 7 is adapted to the pressure block 52. A support plate 72 is rotatably inserted into the outer wall of the end of each support plate 7 away from the irregular column 5. A stop block 71 is welded into the outer wall of the end of each support plate 7 away from the irregular column 5. The stop block 71 is adapted to the support plate 72.

[0037] Under the action of spring 62, the baffle 61 on the abutting sleeve 6 and the switching gear 4 always remain in contact. The telescopic rod 521 can extend and retract freely and limit the movement frame 522. The arc-shaped connecting rod 63 can better fit the inner wall contour of the shoe upper 9. The first support plate 7 and the second support plate 72 can expand the shoe upper 9. Under the limiting action of the pressure block 52 and the stop block 71, the first support plate 7 and the second support plate 72 can only rotate downward to a state perpendicular to the irregular column 5, so that the shoe upper 9 will not fall off when it is fitted on the outer wall of the first support plate 7 and the second support plate 72. In the initial state, under the action of spring 51, the irregular column 5 is in an extended state and the telescopic rod 521 is in a retracted state.

[0038] To further elaborate on the above: After the upper part 9 is loaded, the irregular column 5 drives the upper part 9 to rotate to the lowest point. Under the interception of the conveyor belt 3, the irregular column 5 will gradually slide into the threaded tube 23. The irregular column 5 compresses the spring 51, providing extrusion force to the pressure block 52, so that the pressure block 52 can press the heel. Under the action of the switching gear 4 intercepting the abutment sleeve 6, the pressure block 52 drives the moving frame 522 to gradually approach the abutment sleeve 6, so that the connecting rod 63 gradually pushes the moving frame 522 away from the pressure block 52. Under the action of the telescopic rod 521, the roller 523 always remains tangential to the end wall of the pressure block 52, so that the moving frame 522 can drive the roller 523 to roll from the heel to the toe, thereby making the upper part 9 and the sole 91 press more fully.

[0039] The working principle and usage process of this invention are as follows: The shoe soles 91 are stacked in the loading box 11, and the shoe uppers 9 are arranged in the loading trough 111, with the shoe upper 9 at the bottom of the loading trough 111 held in place by the clamping plate 112. The motor 21 is started. Whenever the rotating frame 2 drives the irregularly shaped column 5 to rotate to the bottom of the loading trough 111, the irregularly shaped column 5 drives the support plate 7 and the support plate 72 to insert into the shoe upper 9, thus simulating the effect of wearing shoes. When the shoe upper 9 at the end of the loading trough 111 detaches, the subsequent shoe upper 9 will slide to the end of the loading trough 111 and be fixed by the clamping plate 112, preparing for the loading of the next shoe upper 9. Then, the irregularly shaped column 5 drives the shoe upper 9 to rotate towards the lowest point. Simultaneously, the conveyor belt 3 drives the shoe sole 91 in the shoe groove 31 to move downwards towards the irregular column 5. When the irregular column 5 is perpendicular to the conveyor belt 3, the shoe sole 91 fits against the shoe upper 9. Under the action of the rolling mechanism, the pressing block 52 presses the heel. The moving frame 522 can drive the roller 523 to roll from the heel to the toe, thereby making the shoe upper 9 and the shoe sole 91 press more fully. After the pressing is completed, as the rotating frame 2 continues to rotate, the irregular column 5 drives the finished shoe to approach the limiting block 141. The limiting block 141 can intercept the heel. As the irregular column 5 gradually rises and is pulled away, it simulates the action of taking off the shoe, causing the finished shoe to fall off and fall into the discharge trough 12 for collection.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A shoe upper and sole compaction device for production, comprising a base (1), characterized in that: A bracket (13) is welded to the top outer wall of one side of the base (1). A motor (21) is welded to the outer wall of the bracket (13). A rotating frame (2) is welded to the main shaft of the motor (21). A pulley drive assembly (22) is provided between the outer wall of the rotating frame (2) away from the motor (21) and the outer wall of the base (1). A pair of tensioning wheels (32) are rotatably inserted into the inner wall of the base (1). A conveyor belt (3) is fitted on the outer wall of the pair of tensioning wheels (32). Several shoe grooves (31) are linearly distributed at equal intervals on the outer wall of the conveyor belt (3). The outer wall of the tensioning wheel (32) near the pulley drive assembly (22) is connected to... A gear transmission group (33) is provided between the pulley transmission group (22). Several threaded tubes (23) with equal circumferential distribution are welded on the outer wall of the rotating frame (2). The threaded tubes (23) correspond to the shoe groove (31). When the rotating frame (2) rotates one tube position, the conveyor belt (3) moves one groove position. A shaped column (5) is slidably inserted into each threaded tube (23). A spring (51) is provided between the end wall of each shaped column (5) and the inner wall of the threaded tube (23). A pressure block (52) is welded on the outer wall of the end of each shaped column (5) away from the spring (51). A rolling mechanism is provided on the shaped column (5). Each of the threaded tubes (23) is fitted with a threaded sleeve (41) through a threaded engagement. A switching gear (4) is welded to the outer wall of the end of each threaded sleeve (41). A gear ring segment one (131) and a gear ring segment two (132) are welded to the outer walls of both sides of the bracket (13). The gear ring segment one (131) and the gear ring segment two (132) are adapted to the switching gear (4). The threaded sleeve (41) is fitted onto the outer wall of the irregular column (5). The rolling mechanism includes an abutment sleeve (6), and each of the irregular columns (5) has a groove (53) on its outer wall. Each groove (53) has a limit rod (531) welded inside it. Each limit rod (531) has an abutment sleeve (6) slidably sleeved on its outer wall. Each abutment sleeve (6) has a spring (62) welded between its end outer wall and the inner wall of the groove (53). Each abutment sleeve (6) has a baffle (61) welded on its outer wall away from the spring (62). Each baffle (61) abuts against the switching gear (4). Each pressure block (52) has a telescopic rod (521) welded on its outer wall. Each telescopic rod (521) has a movable frame (522) welded to the outer wall of its end. Each movable frame (522) has a roller (523) rotatably inserted into the inner wall of its inner wall. The outer contour of each roller (523) is flush with the end wall of the pressure block (52). Each of the abutment sleeves (6) has an arc-shaped connecting rod (63) rotatably inserted into its outer wall, and the end of each connecting rod (63) away from the abutment sleeve (6) is rotatably inserted into the outer wall of the movable frame (522).

2. The shoe upper and sole compaction device for production according to claim 1, characterized in that: A feeding box (11) is welded to the top outer wall of the end of the base (1) away from the support (13). The bottom of the feeding box (11) is in contact with the conveyor belt (3). The shoe groove (31) can only accommodate one shoe sole thickness. An inclined feeding trough (111) is welded to the top outer wall of the feeding box (11). A pair of clamps (112) are slidably inserted into the outer wall of the feeding trough (111) near the support (13). A spring (113) is provided between the outer wall of each clamp (112) and the outer wall of the feeding trough (111).

3. The shoe upper and sole compaction device for production according to claim 2, characterized in that: A limiting plate (14) is welded to the outer wall of the end of the bracket (13) away from the feeding box (11). A limiting block (141) is slidably inserted into the outer wall of the limiting plate (14). A spring (142) is provided between the outer wall of the limiting block (141) and the outer wall of the limiting plate (14). The limiting block (141) is adapted to the shoe upper. A feeding groove (12) is provided below the limiting plate (14).

4. The shoe upper and sole compaction device for production according to claim 1, characterized in that: Each of the irregular columns (5) has a support plate 1 (7) rotatably inserted at one end near the pressure block (52), the support plate 1 (7) being adapted to the pressure block (52), and a support plate 2 (72) rotatably inserted on the outer wall of the end of each support plate 1 (7) away from the irregular column (5), and a stop block (71) welded on the outer wall of the end of each support plate 1 (7) away from the irregular column (5), the stop block (71) being adapted to the support plate 2 (72).

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