Vacuum suction tool device with good sealing performance for workpiece carrying

By designing a detachable vacuum suction device, the problem of difficulty in cleaning existing vacuum suction tools is solved, achieving more efficient cleaning and higher practicality.

CN120117399AActive Publication Date: 2025-06-10HANWA VACUUM TECH (WUXI) CO LTD
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Patent Information

Application Number
CN202510318181.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-18
Publication Date
2025-06-10
Estimated Expiration
2045-03-18

AI Technical Summary

Technical Problem

The housing of the existing vacuum suction tool is generally designed in one piece, and the housing and vacuum suction cup are not easily disassembled, resulting in a troublesome cleaning process and poor results, which affects the subsequent practicality of the vacuum suction tool.

Method used

A vacuum suction device including a housing, a sliding plate, a mounting plate and an end cover is designed. By setting up a sliding plate, a mounting plate and an end cover, the interior of the housing can be quickly removed and cleaned, improving the overall cleaning quality.

Benefits of technology

The rapid disassembly and thorough cleaning of the vacuum suction tool is achieved, improving the cleaning quality and subsequent practicality of the vacuum suction tool.

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Abstract

The invention provides a workpiece carrying vacuum suction tool device with good sealing performance, and belongs to the technical field of vacuum suction tools, the workpiece carrying vacuum suction tool device comprises a shell, a sliding plate is slidably mounted in the lower end of the shell, a mounting plate is arranged at the lower end of the sliding plate, and the interiors of the front side and the rear side of the mounting plate are inserted and fixed in the lower end of the shell through insertion blocks; the other end of the inserting block abuts against a toothed plate, the toothed plate is slidably mounted in the shell, a vacuum suction cup is arranged in a mounting plate, end covers are arranged at the left end and the right end of the shell correspondingly, connecting blocks are arranged at the front ends and the rear ends of the inner sides of the two end covers correspondingly, and the number of the connecting blocks is eight. Through the sliding plate, the mounting plate and the end cover, the mounting plate, the vacuum suction cup and the end cover can be quickly detached from the shell, then most of the sliding plate is transversely moved out of the shell, all positions in the shell can be carefully cleaned, the overall cleaning quality of the vacuum suction cup is improved, and practicability is higher.
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Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum suction devices, and specifically relates to a vacuum suction device with good sealing performance for workpiece handling. Background Art

[0002] A vacuum suction device, usually also known as a vacuum extractor, vacuum suction cup or vacuum gripper, etc., is a tool that uses the pressure difference generated between atmospheric pressure and vacuum to grasp or transport objects. It contacts the surface of the object and creates a vacuum state inside it. At this time, the external atmospheric pressure will tightly press the object against the suction cup, thereby achieving the fixation or movement of the object. This tool has a wide range of applications in multiple fields such as industrial automation, packaging, and handling, especially performing well when dealing with smooth, fragile or irregularly shaped items.

[0003] After the vacuum suction device is used for a period of time, it needs to be disassembled and then cleaned to prevent excessive accumulation of impurities inside the vacuum suction device, which may damage the vacuum suction device or affect its grasping effect. However, the existing vacuum suction device housing is generally of an integral design, and it is not easy to disassemble the housing from the vacuum suction cup. Only the end caps on both sides of the housing can be disassembled, and the air blowing pipe is inserted into the housing to blow air through the ventilation holes for cleaning. This makes the cleaning process rather troublesome, and the air blowing pipe cannot reach the middle of the housing, so only long-distance blowing is possible, resulting in a poor overall cleaning effect of the suction device and affecting the subsequent practicality of the vacuum suction device.

[0004] Therefore, we propose a vacuum suction device with good sealing performance for workpiece handling to solve the problems encountered above. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that after the vacuum suction device is used for a period of time, it needs to be disassembled and then cleaned to prevent excessive accumulation of impurities inside the vacuum suction device, which may damage the vacuum suction device or affect its grasping effect. However, the existing vacuum suction device housing is generally of an integral design, and it is not easy to disassemble the housing from the vacuum suction cup. Only the end caps on both sides of the housing can be disassembled, and the air blowing pipe is inserted into the housing to blow air through the ventilation holes for cleaning. This makes the cleaning process rather troublesome, and the air blowing pipe cannot reach the middle of the housing, so only long-distance blowing is possible, resulting in a poor overall cleaning effect of the suction device and affecting the subsequent practicality of the vacuum suction device. Therefore, a vacuum suction device with good sealing performance for workpiece handling is proposed.

[0006] The object of the present invention can be achieved by the following technical solutions: It includes a housing, a sliding plate is slidably installed inside the lower end of the housing, an installation plate is arranged at the lower end of the sliding plate, both the front and rear sides of the installation plate are fixedly inserted into the lower end inside of the housing through insertion blocks, the other end of the insertion block abuts against a toothed plate, and the toothed plate is slidably installed inside the housing, a vacuum suction cup is arranged inside the installation plate, end covers are arranged at both the left and right ends of the housing, connection blocks are arranged at the front and rear ends of the inner sides of the two end covers, and there are eight connection blocks in total. Fixing bolts are screwed inside the eight connection blocks, and the inner ends of the eight fixing bolts are screwed inside the front and rear sides of the housing.

[0007] As a preferred embodiment of the present invention, the inner ends of the two upper fixing bolts on the right side are both screwed with toothed blocks, the upper ends of the two groups of toothed blocks are both meshed with a first straight gear, a rotating shaft is arranged on the left side of each of the two groups of first straight gears, a second straight gear is arranged on the circumferential surface of each of the two rotating shafts, and the second straight gear is meshed with the upper end of the toothed plate.

[0008] As a preferred embodiment of the present invention, a first rotating groove, a first vertical moving groove and a second vertical moving groove are opened inside the upper ends of the front and rear sides of the housing, and the first rotating groove, the first vertical moving groove and the second vertical moving groove communicate with each other. The second straight gear is arranged inside the first rotating groove, and the upper part of the toothed plate is arranged inside the first vertical moving groove and the second vertical moving groove.

[0009] As a preferred embodiment of the present invention, a transverse moving groove is opened inside the lower ends of the front and rear sides of the housing, a vertical through groove is opened inside the front end of the sliding plate, the lower part of the toothed plate penetrates through the vertical through groove and extends into the transverse moving groove, the end of the insertion block away from the installation plate is slidably installed inside the transverse moving groove through a limiting slider, and the end of the toothed plate below near the installation plate and the end of the insertion block above away from the installation plate are both arc-shaped designs.

[0010] As a preferred embodiment of the present invention, a second rotating groove is opened inside the front and rear ends of the right side of the housing, the sides of the two groups of toothed blocks away from the end covers and the two groups of first straight gears are respectively arranged inside the two second rotating grooves.

[0011] As a preferred embodiment of the present invention, a first slot is opened inside the rear side of the housing, the rear end of the sliding plate is inserted into the first slot, sealing gaskets are arranged on the left, right and rear sides of the sliding plate, the front end of the sliding plate penetrates through the front end of the housing and is flush with the front surface of the housing, a ventilation hole is opened inside the sliding plate, and the upper end of the vacuum suction cup is inserted into the ventilation hole.

[0012] As a preferred embodiment of the present invention, mounting grooves are provided inside both the front and rear sides of the mounting plate. Springs are arranged inside the mounting grooves. One end of the spring close to the insertion block is provided with a push block, and the push block abuts against the insertion block.

[0013] As a preferred embodiment of the present invention, slot threes are provided inside both the front and rear sides of the right end cap. The sides of the two groups of tooth blocks away from the fixing bolts are inserted into the slot threes. Inside the lower ends of the two groups of end caps, limiting insertion plates are arranged. Slot twos are provided inside both the left and right sides of the sliding plate. The two groups of limiting insertion plates are respectively inserted into the two slot twos.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By providing the sliding plate, the mounting plate and the end cap, the mounting plate, the vacuum suction cup and the end cap can be quickly disassembled from the housing. Then, most of the sliding plate is horizontally moved out of the housing, so that all positions inside the housing can be carefully cleaned, improving the overall cleaning quality of the vacuum suction tool and having higher practicability. (2) After the connection block and the end cap are fixed inside the housing through the fixing bolts, the fixing bolts will also drive the tooth blocks to move, and then drive the first spur gear, the rotating shaft and the second spur gear to rotate, so that the toothed plate moves downward, pushing part of the insertion block into the mounting plate. Then, the toothed plate fixes the sliding plate, and the insertion block fixes the mounting plate. At the same time, part of the tooth block can also be inserted into the end cap to further fix the end cap. Then, the sliding plate, the mounting plate, the vacuum suction cup and the end cap are fixedly installed on the housing, facilitating the subsequent use of the vacuum suction cup. By directly removing the fixing bolts, the end cap and the mounting plate lose their fixing effect with the housing, facilitating the quick removal of the end cap and the mounting plate from the housing and facilitating the cleaning work of the vacuum suction tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 is the three-dimensional structure diagram of the present invention; Figure 2 is the front sectional three-dimensional view of the present invention; Figure 3 is the first left sectional three-dimensional structure diagram of the present invention; Figure 4 is the Figure 3 enlarged structure diagram of part A in the present invention; Figure 5 is the second left sectional three-dimensional structure diagram of the present invention; Figure 6 is the top sectional three-dimensional view of the present invention; Figure 7Partial cross-sectional view of the mounting plate of the present invention; Figure 8 Partial cross-sectional view of the end cap of the present invention.

[0017] In the figure: 1. Housing; 101. Tooth block; 102. First spur gear; 103. Rotating shaft; 104. Second spur gear; 105. Tooth plate; 106. Insertion block; 107. Limit slider; 108. First rotating groove; 109. First vertical movement groove; 110. Second vertical movement groove; 111. Lateral movement groove; 112. First slot; 113. Second rotating groove; 2. Sliding plate; 201. Vent hole; 202. Sealing gasket; 203. Vertical through groove; 204. Second slot; 3. Mounting plate; 301. Spring; 302. Pushing block; 303. Mounting groove; 4. Vacuum suction cup; 5. End cap; 501. Connecting block; 502. Fixing bolt; 503. Third slot; 504. Limit insertion plate. Detailed implementation manners

[0018] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figure 1 - Figure 8 As shown in the figure, a vacuum suction device with good sealing performance for workpiece handling includes a housing 1. A sliding plate 2 is slidably installed inside the lower end of the housing 1. A first slot 112 is opened inside the rear side of the housing 1. The rear end of the sliding plate 2 is inserted into the first slot 112. Sealing gaskets 202 are provided on the left, right, and rear sides of the sliding plate 2. The front end of the sliding plate 2 penetrates through the front end of the housing 1 and is flush with the front surface of the housing 1. A vent hole 201 is opened inside the sliding plate 2. A mounting plate 3 is provided at the lower end of the sliding plate 2. A vacuum suction cup 4 is provided inside the mounting plate 3. The upper end of the vacuum suction cup 4 is inserted into the vent hole 201. The setting of the vent hole 201 enables the vacuum suction cup 4 to generate negative pressure when negative pressure is generated inside the housing 1 through the vent hole 201, and then the workpiece can be smoothly grasped. End caps 5 are provided at both the left and right ends of the housing 1; It should be noted that after the rear end of the sliding plate 2 is inserted into the first slot 112, the sliding plate 2 is hermetically connected to the inner wall of the housing 1 through the sealing gasket provided on the side wall of the sliding plate 2, avoiding gas leakage through the connection between the sliding plate 2 and the housing 1 during the operation of the vacuum suction device, which affects the grasping effect of the vacuum suction cup 4.

[0020] The front and rear sides inside the mounting plate 3 are both fixedly inserted into the lower end inside the housing 1 through the insertion blocks 106. The other end of the insertion block 106 abuts against a toothed plate 105, and the toothed plate 105 is slidably installed inside the housing 1. At the front and rear ends of the inner sides of the two end caps 5, connection blocks 501 are provided, and there are a total of eight connection blocks 501. Fixing bolts 502 are screwed inside the eight connection blocks 501. The inner ends of the eight fixing bolts 502 are screwed inside the front and rear sides of the housing 1. The setting of the fixing bolts 502 can fixedly install the connection blocks 501 on the housing 1, and then fixedly install the end caps 5 on the housing 1. The inner ends of the two upper fixing bolts 502 on the right side are both screwed with toothed blocks 101. The upper ends of the two groups of toothed blocks 101 are both meshed with a first spur gear 102. On the left side of the two groups of first spur gears 102, there are rotating shafts 103. On the circumferential surfaces of the two rotating shafts 103, second spur gears 104 are provided. The second spur gears 104 are meshed with the upper ends of the toothed plates 105. Installation grooves 303 are opened inside the front and rear sides of the mounting plate 3. Springs 301 are arranged inside the installation grooves 303. One end of the spring 301 close to the insertion block 106 is provided with a push block 302, and the push block 302 abuts against the insertion block 106. Among them, there are eighteen second spur gears 104, toothed plates 105, insertion blocks 106, installation grooves 303, springs 301 and push blocks 302. When the rotating shaft 103 rotates, the eighteen second spur gears 104 can drive the eighteen toothed plates 105 to move vertically together, and then drive the eighteen insertion blocks 106 to insert into the installation grooves 303 inside the mounting plate 3 or move out from the installation grooves 303. The setting of multiple groups of insertion blocks 106 can also limit and fix the mounting plate 3 more stably, avoiding the mounting plate 3 from shaking and detaching, which affects the effect of the vacuum chuck 4 for gripping workpieces; It should be noted that during the process of screwing the fixing bolt 502 into the housing 1, the inner end of the fixing bolt 502 will contact the toothed block 101. At this time, because there is a moving space on the other side of the toothed block 101, the inner end of the fixing bolt 502 is not enough to be screwed inside the toothed block 101. At this time, it will drive the toothed block 101 to move inside the end cap 5, so that the toothed block 101 drives the first spur gear 102 and the rotating shaft 103 to rotate. Then when the toothed block 101 moves into the end cap 5 and abuts inside the end cap 5, continue to rotate the fixing bolt 502, and the inner end of the fixing bolt 502 will be screwed inside the toothed block 101, so that the fixing bolt 502 is connected to the toothed block 101. For subsequent disassembly, when the fixing bolt 502 rotates outward from the housing 1, it will drive the toothed block 101 to move and move the toothed block 101 out of the inside of the end cap 5.

[0021] At the upper ends inside the front and rear sides of the housing 1, a first rotation groove 108, a first vertical movement groove 109, and a second vertical movement groove 110 are provided, and the first rotation groove 108, the first vertical movement groove 109, and the second vertical movement groove 110 communicate with each other. The second spur gear 104 is arranged inside the first rotation groove 108. The provision of the first rotation groove 108 provides a movement space for the second spur gear 104, enabling the second spur gear 104 to rotate smoothly. The upper part of the toothed plate 105 is arranged inside the first vertical movement groove 109 and the second vertical movement groove 110. The provision of the first vertical movement groove 109 provides a movement space for the teeth of the toothed plate 105, and the provision of the second vertical movement groove 110 provides a movement space for the whole toothed plate 105, enabling the toothed plate 105 to move vertically smoothly. Inside the lower ends of the front and rear sides of the housing 1, a transverse movement groove 111 is provided. Inside the front end of the sliding plate 2, a vertical through groove 203 is provided. The lower part of the toothed plate 105 passes through the vertical through groove 203 and extends into the transverse movement groove 111. One end of the insertion block 106 away from the mounting plate 3 is slidably mounted inside the transverse movement groove 111 through a limit slider 107. The provision of the transverse movement groove 111 facilitates the downward movement of the lower end of the toothed plate 105 into the transverse movement groove 111 and also provides a horizontal movement space for the insertion block 106, enabling the insertion block 106 to move horizontally smoothly. The provision of the limit slider 107 limits the horizontal movement distance of the insertion block 106, preventing the insertion block 106 from moving too much and moving out of the housing 1, affecting the use. One end of the toothed plate 105 close to the mounting plate 3 at the lower part and one end of the insertion block 106 away from the mounting plate 3 at the upper part are both arc-shaped. The arc-shaped design of the lower end of the toothed plate 105 and the upper end of the insertion block 106 enables the toothed plate 105 to smoothly push the insertion block 106 horizontally when moving downward; Inside the front and rear ends on the right side of the housing 1, second rotation grooves 113 are provided. One side of the two groups of toothed blocks 101 away from the end cover 5 and the two groups of first spur gears 102 are respectively arranged inside the two second rotation grooves 113. The provision of the second rotation grooves 113 provides a movement space for the toothed blocks 101 and the first spur gears 102, enabling the toothed blocks 101 to move horizontally forward and backward smoothly and the first spur gears 102 to rotate smoothly. Inside the front and rear sides of the right end cover 5, third slots 503 are provided. One side of the two groups of toothed blocks 101 away from the fixing bolts 502 is inserted into the third slots 503, enabling the toothed blocks 101 to be inserted into the third slots 503, thereby improving the fixing effect of the end cover 5 on the housing 1. Inside the lower ends of the two groups of end covers 5, limit insertion plates 504 are provided. Inside the left and right sides of the sliding plate 2, second slots 204 are provided. The two groups of limit insertion plates 504 are respectively inserted into the two second slots 204. The provision of the second slots 204 enables the limit insertion plates 504 to be inserted into the second slots 204. The provision of the limit insertion plates 504 can improve the stability of the sliding plate 2, making the fixing effect of the whole vacuum suction device better.

[0022] When the present invention is in use, when some dust and impurities are inhaled inside the housing 1, affecting the grasping effect of the vacuum suction cup 4, first, the fixing bolt 502 is screwed out from inside the housing 1. During the process of the fixing bolt 502 on the upper right being screwed out from inside the housing 1, the fixing bolt 502 will drive the tooth block 101 to move towards the inside of the housing 1, causing the tooth block 101 to move out of the slot three 503 and completely move into the rotation slot three 113 of the housing 1. When the whole tooth block 101 moves into the housing 1, the fixing bolt 502 continues to rotate, disengages from the tooth block 101, and then is screwed out from inside the housing 1, causing the end cover 5 to lose its fixing effect with the housing 1. At this time, the end cover 5 can be detached from the housing 1; During the movement of the tooth block 101, it will engage with the first spur gear 102, thereby driving the first spur gear 102 to rotate. The rotation of the first spur gear 102 will drive the rotating shaft 103 and the second spur gear 104 to rotate. The rotation of the second spur gear 104 drives the toothed plate 105 to move upward, causing the upper end of the toothed plate 105 to abut against the inner wall of the housing 1, thereby driving the lower end of the toothed plate 105 to move out of the transverse movable slot 111 and move above the sliding plate 2. After the plug-in block 106 no longer abuts against the side surface of the lower end of the toothed plate 105, the elastic force of the spring 301 is released, pushing the push block 302 outwards, making the outer side of the push block 302 flush with the side wall of the mounting plate 3, and then pushing the plug-in block 106 out of the mounting slot 303 and entirely into the transverse movable slot 111, causing the mounting plate 3 to lose its fixing effect with the housing 1. At this time, the mounting plate 3 and the vacuum suction cup 4 can be detached from the housing 1; After that, the sliding plate 2 is pushed horizontally to the left, causing the sliding plate 2 to move out from the left side of the housing 1. At this time, the inside of the housing 1 is entirely exposed, facilitating the staff to conduct a complete cleaning work on the inside of the housing 1. After the cleaning is completed, by performing the above operations in reverse, the vacuum suction device can be reassembled and used again.

[0023] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not elaborate on all the details, nor do they limit the invention to only the specific implementation manners. Obviously, according to the content of this specification, many modifications and variations can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the relevant technical fields can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A vacuum suction device with good sealing performance for workpiece handling, comprising a housing (1), characterized in that: A sliding plate (2) is slidably mounted inside the lower end of the shell (1), and a mounting plate (3) is provided at the lower end of the sliding plate (2). The interior of the mounting plate (3) is fixed to the interior of the lower end of the shell (1) via plug-in blocks (106) at both front and rear sides, and the other end of the plug-in block (106) is abutted against a tooth plate (105), and the tooth plate (105) is slidably mounted inside the shell (1). A vacuum suction cup (4) is provided inside the mounting plate (3). End covers (5) are provided at both left and right ends of the shell (1), and connecting blocks (501) are provided at both front and rear ends of the inner sides of the two end covers (5), and there are eight connecting blocks (501) in total. Fixing bolts (502) are screwed inside the eight connecting blocks (501), and the inner ends of the eight fixing bolts (502) are screwed inside the interior of the front and rear sides of the shell (1).

2. A vacuum suction device with good sealing performance for workpiece handling according to claim 1, characterized in that: The inner ends of the two upper fixing bolts (502) on the right side are both threaded with tooth blocks (101), the upper ends of the two groups of tooth blocks (101) are meshingly connected with spur gears 1 (102), the left sides of the two groups of spur gears 1 (102) are both provided with rotating shafts (103), the circumferential surfaces of the two rotating shafts (103) are both provided with spur gears 2 (104), and the spur gears 2 (104) are meshingly connected with the upper ends of the tooth plates (105).

3. A vacuum suction device with good sealing performance for workpiece handling according to claim 2, characterized in that: A rotation groove 1 (108), a vertical movement groove 1 (109) and a vertical movement groove 2 (110) are provided inside the upper ends of the front and rear sides of the shell (1), and the rotation groove 1 (108), the vertical movement groove 1 (109) and the vertical movement groove 2 (110) are connected to each other. The spur gear 2 (104) is arranged inside the rotation groove 1 (108), and the upper part of the tooth plate (105) is arranged inside the vertical movement groove 1 (109) and the vertical movement groove 2 (110).

4. A vacuum suction device with good sealing performance for workpiece handling according to claim 2, characterized in that: The lower ends of the front and rear sides of the housing (1) are provided with transverse movable grooves (111), the front end of the sliding plate (2) is provided with a vertical through groove (203), the lower portion of the tooth plate (105) passes through the vertical through groove (203) and extends to the inside of the transverse movable groove (111), the end of the plug-in block (106) away from the mounting plate (3) is slidably mounted in the inside of the transverse movable groove (111) via a limiting slider (107), and the lower end of the tooth plate (105) close to the mounting plate (3) and the upper end of the plug-in block (106) away from the mounting plate (3) are both of arc-shaped design.

5. A vacuum suction device with good sealing performance for workpiece handling according to claim 2, characterized in that: The housing (1) is provided with a second rotation groove (113) at both the front and rear ends on the right side. The two sets of tooth blocks (101) on the side away from the end cover (5) and the two sets of spur gears (102) are respectively arranged inside the two second rotation grooves (113).

6. A vacuum suction device with good sealing performance for workpiece handling according to claim 1, characterized in that: A slot one (112) is provided inside the rear side of the shell (1), the rear end of the sliding plate (2) is plugged into the inside of the slot one (112), sealing pads (202) are provided on the left and right sides and the rear side of the sliding plate (2), the front end of the sliding plate (2) passes through the front end of the shell (1) and is flush with the front side of the shell (1), a vent hole (201) is provided inside the sliding plate (2), and the upper end of the vacuum suction cup (4) is plugged into the inside of the vent hole (201).

7. A vacuum suction device with good sealing performance for workpiece handling according to claim 1, characterized in that: The front and rear sides of the mounting plate (3) are both provided with mounting grooves (303), a spring (301) is arranged inside the mounting groove (303), a push block (302) is arranged at one end of the spring (301) close to the plug-in block (106), and the push block (302) abuts against the plug-in block (106).

8. A vacuum suction device with good sealing performance for workpiece handling according to claim 2, characterized in that: The front and rear sides of the right end cover (5) are each provided with a slot three (503), and the sides of the two sets of tooth blocks (101) away from the fixing bolts (502) are inserted into the inside of the slot three (503). The inner sides of the lower ends of the two sets of end covers (5) are each provided with a limit plug plate (504). The left and right sides of the sliding plate (2) are each provided with a slot two (204), and the two sets of limit plug plates (504) are respectively inserted into the inside of the two slots two (204).

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