Positioning and clamping device for bearing ring production

Abstract

The utility model discloses bearing ring production positioning clamping device, including work table, fixedly connected on the work table's vertical station, still include the drive assembly, the distance adjusting assembly and the relief loose component of installing on the work table, install the connecting frame on the drive assembly output, the clamping assembly and install the self -lock subassembly of sliding connection in the connecting frame on the clamping assembly and the connecting frame, install the arc gear rack on the vertical station, set up the second groove body on the connecting frame. The utility model uses gear - rack drive and mechanical linkage to drive with single motor, and cooperates distance adjusting and self -lock subassembly, compares traditional many cylinder mode, reduces equipment purchase, manpower investment cost, shortens the production cycle, the ratchet - pawl structure of self -lock subassembly makes arc clamping block still can fixedly clamp after separating power, reduces energy consumption, the first, second arc baffle of relief loose component can conveniently release clamping, and conveniently takes material, improves production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of bearing processing technology, specifically to a bearing ring production positioning and clamping device. Background Technology

[0002] In the field of bearing processing and manufacturing, clamping technology is a key link to ensure processing accuracy and efficiency. Accurate and stable clamping can ensure that the bearing remains in a fixed position during processing, preventing processing errors caused by positional deviation, which in turn affect the quality and performance of the bearing. Therefore, the development of efficient, reliable and economical bearing processing clamping technology has always been a focus of industry attention.

[0003] Existing technologies for clamping multiple bearings often employ an independent approach, using separate cylinders and other equipment for each bearing. Due to the lack of integrated design, while this approach can meet the requirements, it suffers from drawbacks such as high costs (cylinders and supporting systems are expensive), complex installation and debugging (requiring high skill levels for personnel and extending the production cycle), difficult maintenance (the system is complex and susceptible to environmental influences), and cumbersome mechanical adjustments (affecting processing quality). Furthermore, cylinder clamping has significant overall costs, high system integration leads to numerous subsequent problems, and the lack of a convenient clamping release mechanism increases process complexity and affects efficiency. Therefore, it is essential to develop an automatic clamping release component. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, the purpose of this utility model is to provide a bearing ring production positioning and clamping device. It adopts gear-rack transmission and mechanical linkage, driven by a single motor, and is equipped with adjustable and self-locking components. Compared with the traditional multi-cylinder method, it reduces equipment procurement and labor input costs and shortens the production cycle. The ratchet-tooth structure of the self-locking component allows the arc-shaped clamping block to remain fixed and clamped even after being disengaged from the power source, reducing energy consumption. The first and second arc-shaped baffles of the release tensioning component can easily release the clamping, facilitate material removal, and improve production efficiency.

[0005] The objective of this utility model is achieved through the following technical solution: The bearing ring production positioning and clamping device includes a worktable and a vertical platform fixedly connected to the worktable; it also includes a drive assembly, a pitch adjustment assembly and a tension release assembly installed on the worktable, a connecting frame installed on the output end of the drive assembly, a clamping assembly slidably connected to the connecting frame, and a self-locking assembly installed on the clamping assembly and the connecting frame. An arc-shaped rack is installed on the vertical platform, and a second groove is provided on the connecting frame. The clamping assembly includes a plug slidably connected to the second groove, a first fixed plate mounted on the plug, a first limiting groove on the first fixed plate, a plurality of circularly distributed sliding rods slidably connected to the first limiting groove, an arc-shaped clamping block mounted on the sliding rod, a second limiting post mounted on the sliding rod, a second fixed plate rotatably connected to the first fixed plate, a second limiting groove on the second fixed plate, and a gear mounted on the second fixed plate. The second limiting post simultaneously limits the sliding of the first limiting groove and the second limiting groove. The arc-shaped rack and the gear mesh with each other. When the drive assembly drives the connecting frame to rotate, when the clamping assembly contacts the arc-shaped rack, it causes the gear to rotate. The rotation of the gear causes the second fixed plate to rotate synchronously, thereby causing the sliding rods on the first fixed plate to slide in a direction away from or close to the first fixed plate.

[0006] In one alternative embodiment, the drive assembly includes a motor mounted on a workbench and a rotating disk mounted on the output end of the motor, with the rotating disk and the connecting frame connected to each other.

[0007] In one optional embodiment, the adjusting assembly includes a first groove on the worktable, a limiting block slidably connected to the first groove, a mounting block mounted on the worktable, a stud rotatably connected to the mounting block, a threaded sleeve mounted on the limiting block, and a first limiting post mounted on the worktable. The limiting block is slidably disposed on the first limiting post, and the stud and the threaded sleeve are threadedly connected. The rotation of the stud drives the limiting block to move vertically in the first groove.

[0008] In one optional embodiment, the upper surface of the limiting block is designed as an arc-shaped structure that gradually rises and then falls. The spatial position of the limiting block is within the trajectory range formed by the drive component driving the insert block to move. When the drive component drives the insert block to rotate onto the limiting block, the limiting block drives the insert block to make vertical displacement.

[0009] In one optional embodiment, the self-locking assembly includes a rotating rod rotatably connected to the connecting frame, a paddle and a locking tooth mounted on the rotating rod, and a fixed post mounted on the connecting frame. A spring is connected between the fixed post and the locking tooth, and the spring is used to drive the locking tooth to rotate toward the fixed post.

[0010] In one alternative embodiment, the unwinding assembly includes a second arc-shaped baffle mounted on the workbench and a first arc-shaped baffle mounted on the arc-shaped rack.

[0011] In one optional embodiment, the second arc-shaped baffle is an arc-shaped structure, and the spatial position of the second arc-shaped baffle is within the trajectory range formed by the drive component driving the paddle to move. When the drive component drives the paddle to rotate to the position of the second arc-shaped baffle, the second arc-shaped baffle drives the teeth on the paddle to rotate toward the end away from the fixed post.

[0012] In one optional embodiment, the upper surface of the arc-shaped clamping block is divided into L1 and L2. The upper end of the first arc-shaped baffle is flush with the upper end of L1. When the driving component drives the arc-shaped clamping block to rotate to the position of the first arc-shaped baffle, the arc surface of the first arc-shaped baffle drives the arc-shaped clamping block to move towards the direction of the first fixed plate.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The drive assembly drives the connecting frame to rotate, and the gear on the connecting frame meshes with the arc rack on the platform, causing the gear to rotate and drive the second fixed plate to rotate. This causes the sliding rod on the first fixed plate to slide in a direction away from or close to the first fixed plate, thus achieving the clamping action. The adjustment assembly disengages the gear from the arc rack, and the self-locking assembly fixes the clamping force.

[0014] 2. When the gear rotates, the ratchet rotates synchronously, and the spring exerts a pulling force on the locking teeth. When the locking teeth are inserted into the groove of the ratchet, the ratchet can only rotate in one direction. When the gear disengages from the arc-shaped rack, the arc-shaped clamping block can still maintain a fixed clamping state.

[0015] 3. When the drive assembly drives the paddle to rotate to the position of the second arc-shaped baffle, the second arc-shaped baffle drives the teeth on the paddle to rotate away from the fixed post, so that the teeth do not contact the tooth groove of the ratchet, and the second fixed plate is in a rotatable state; at the same time, when the drive assembly drives the arc-shaped clamping block to rotate to the position of the first arc-shaped baffle, the arc surface of the first arc-shaped baffle drives the arc-shaped clamping block to move towards the first fixed plate, thereby realizing the gathering of multiple arc-shaped clamping blocks. Attached Figure Description

[0016] Figure 1 A three-dimensional structural diagram of a positioning and clamping device for bearing ring production; Figure 2 A three-dimensional structural diagram of the spacing adjustment component for the positioning and clamping device in bearing ring production; Figure 3 A three-dimensional structural diagram of the worktable for the positioning and clamping device used in bearing ring production; Figure 4 A three-dimensional disassembled structural diagram of the clamping assembly for a positioning and clamping device used in bearing ring production; Figure 5 A three-dimensional structural diagram of the release and loosening assembly of the positioning and clamping device for bearing ring production; Figure 6 A three-dimensional disassembled structural diagram of the self-locking component of the positioning and clamping device for bearing ring production; Figure 7 A three-dimensional structural diagram of the clamping assembly for a positioning and clamping device used in bearing ring production.

[0017] In the diagram: 1. Workbench; 101. Stand; 102. Arc-shaped rack; 103. First arc-shaped baffle; 104. Second arc-shaped baffle; 105. First groove; 2. Limiting block; 201. First limiting post; 202. Mounting block; 203. Screw sleeve; 204. Stud; 3. Motor; 301. Rotating disk; 302. Connecting frame; 303. Second groove; 4. Insert block; 401. First fixed disk; 402. First limiting slide groove; 403. Second limiting post; 404. Sliding rod; 405. Arc-shaped clamping block; 406. Second fixed disk; 407. Second limiting slide groove; 408. Gear; 5. Ratchet; 501. Fixed post; 502. Rotating rod; 503. Paddle; 504. Clamping tooth; 505. Spring. Detailed Implementation

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, the internal connection of two elements, or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0022] Please refer to Figures 1-7 This utility model provides an embodiment of a bearing ring production positioning and clamping device, which includes a worktable 1 and a vertical platform 101 fixedly connected to the worktable 1; it also includes a drive assembly, a pitch adjustment assembly and a tension release assembly installed on the worktable 1, a connecting frame 302 installed on the output end of the drive assembly, a clamping assembly slidably connected to the connecting frame 302 and a self-locking assembly installed on the clamping assembly and the connecting frame 302, an arc-shaped rack 102 installed on the vertical platform 101, and a second groove 303 opened on the connecting frame 302; The clamping assembly includes an insert block 4 slidably connected to the second groove 303, a first fixed plate 401 mounted on the insert block 4, a first limiting groove 402 formed on the first fixed plate 401, a plurality of circularly distributed sliding rods 404 slidably connected to the first limiting groove 402, an arc-shaped clamping block 405 mounted on the sliding rods 404, a second limiting post 403 mounted on the sliding rods 404, a second fixed plate 406 rotatably connected to the first fixed plate 401, and a second limiting groove formed on the second fixed plate 406. 407 and gear 408 mounted on the second fixed plate 406, the second limiting post 403 simultaneously limit sliding on the first limiting groove 402 and the second limiting groove 407, the arc-shaped rack 102 and gear 408 mesh with each other, when the drive assembly drives the connecting frame 302 to rotate, when the clamping assembly contacts the arc-shaped rack 102, the gear 408 rotates, the rotation of the gear 408 causes the second fixed plate 406 to rotate synchronously, thereby causing the sliding rod 404 on the first fixed plate 401 to slide in a direction away from or close to the first fixed plate 401.

[0023] In a preferred embodiment of this utility model, by placing the bearing ring on the arc-shaped clamping block 405 of the clamping assembly, the connecting frame 302 is rotated by the driving assembly, causing the gear 408 on the connecting frame 302 to contact the arc-shaped rack 102. Because the second groove 303 is a square groove and is adapted to the insert block 4, the insert block 4 can only move up and down instead of rotating, thereby causing the gear 408 to drive the second fixed disk 406 to rotate synchronously. When the second fixed disk 406 rotates, the second limiting post 403 on the first fixed disk 401... The clamping component slides in the limiting groove 402. When the clamping component rotates clockwise around the driving component, the arc-shaped clamping block 405 moves away from the first fixed plate 401, thereby clamping the inner ring of the bearing ring. Then, the gear 408 and the arc-shaped rack 102 are disengaged by the adjusting component, and the clamping force is fixed by the self-locking component. Then, the bearing ring is processed. After the processing is completed, the driving component drives the clamping component to move onto the release component, thereby fixing the self-locking component and bringing the arc-shaped clamping block 405 on the clamping component together.

[0024] In a preferred embodiment of this utility model, the drive assembly includes a motor 3 mounted on the workbench 1 and a rotating disk 301 mounted on the output end of the motor 3. The rotating disk 301 and the connecting frame 302 are connected to each other. When the motor 3 is turned on, the output shaft of the motor 3 drives the rotating disk 301 to rotate.

[0025] In a preferred embodiment of this utility model, the adjusting assembly includes a first groove 105 formed on the workbench 1, a limiting block 2 slidably connected to the first groove 105, a mounting block 202 mounted on the workbench 1, a stud 204 rotatably connected to the mounting block 202, a threaded sleeve 203 mounted on the limiting block 2, and a first limiting post 201 mounted on the workbench 1. The limiting block 2 is slidably disposed on the first limiting post 201. The stud 204 and the threaded sleeve 203 are threadedly connected. The rotation of the stud 204 drives the limiting block 2 to move vertically in the first groove 105. The upper surface of the limiting block 2 is designed as an arc-shaped structure that gradually rises and then falls. The space in which the limiting block 2 is located... The position is within the trajectory range formed by the drive assembly driving the insert 4 to move. When the drive assembly drives the insert 4 to rotate onto the limit block 2, the limit block 2 drives the insert 4 to move vertically. By rotating the stud 204, the limit and thread structure on the limit block 2 can make the limit block 2 move up and down on the first groove 105. When facing a bearing ring with a large radius, by lowering the position of the limit block 2, the gear 408 and the arc rack 102 can fully mesh and rotate. When facing a bearing ring with a small radius, by raising the position of the limit block 2, the gear 408 and the arc rack 102 can briefly mesh and rotate, thereby adapting to the clamping work of bearing outer rings of different sizes.

[0026] In a preferred embodiment of this utility model, the self-locking assembly includes a rotating rod 502 rotatably connected to the connecting frame 302, a paddle 503 and a locking tooth 504 mounted on the rotating rod 502, and a fixing post 501 mounted on the connecting frame 302. A spring 505 is connected between the fixing post 501 and the locking tooth 504. The spring 505 drives the locking tooth 504 to rotate towards the fixing post 501. Simultaneously, the ratchet 5 rotates synchronously with the gear 408. Through the pulling force of the spring 505 on the locking tooth 504, when the locking tooth 504 is inserted into the tooth groove on the ratchet 5, the ratchet 5 can only rotate in one direction. Its function is to... When gear 408 disengages from the arc-shaped rack 102, the arc-shaped clamping block 405 remains in a fixed clamping state. The release mechanism includes a second arc-shaped baffle 104 mounted on the worktable 1 and a first arc-shaped baffle 103 mounted on the arc-shaped rack 102. The second arc-shaped baffle 104 has an arc-shaped structure, and its spatial position is within the trajectory range formed by the drive assembly driving the paddle 503 to move. When the drive assembly drives the paddle 503 to rotate to the position of the second arc-shaped baffle 104, the second arc-shaped baffle 104 drives the locking teeth 504 on the paddle 503 to rotate towards the end away from the fixed post 501. In a preferred embodiment of this utility model, the upper surface of the arc-shaped clamping block 405 is divided into L1 and L2. The upper end of the first arc-shaped baffle 103 is flush with the upper end of L1. When the driving component drives the arc-shaped clamping block 405 to rotate to the position of the first arc-shaped baffle 103, the arc surface of the first arc-shaped baffle 103 drives the arc-shaped clamping block 405 to move towards the first fixed plate 401. After the outer ring of the bearing is processed, when the driving component drives the clamping component to move to the position of the second arc-shaped baffle 104, the paddle 503 is blocked by the second arc-shaped baffle 104, so that the paddle 503 drives the cleat 504 to not contact the tooth groove of the ratchet 5, so that the second fixed plate 406 is in a rotatable state. At the same time, the arc-shaped structure of the first arc-shaped baffle 103 presses the outer arc of the arc-shaped clamping block 405, thereby realizing the gathering of multiple arc-shaped clamping blocks 405, thereby stopping the clamping, facilitating material removal and subsequent repeated work.

[0027] The adjustable distance assembly consists of a limit block 2, a first limit post 201, a mounting block 202, a threaded sleeve 203, and a stud 204. The stud 204 can be replaced by a cylinder. The output end of the cylinder is connected to the limit block 2. By opening the cylinder, the limit block 2 is driven to move up and down in the first groove 105. This operating mode has advantages in operating accuracy, can achieve more precise drive control, and can be remotely controlled.

[0028] Working principle: When motor 3 is turned on, the output shaft of motor 3 drives the rotating disk 301 to rotate, and the rotating disk 301 drives the connecting frame 302 to rotate. The rotation of the connecting frame 302 causes the gear 408 to contact and mesh with the arc-shaped rack 102. Because the second groove 303 is square and adapted to the insert 4, the insert 4 can only move up and down without rotating. The rotation of gear 408 drives the second fixed disk 406 to rotate synchronously. When the second fixed disk 406 rotates, the second limiting post 403 slides in the first limiting groove 402 of the first fixed disk 401. When the clamping assembly surrounds the driving assembly... When rotated clockwise, the arc-shaped clamping block 405 moves away from the first fixed plate 401, thereby clamping the inner ring of the bearing ring. When the stud 204 is rotated, the limiting block 2 moves vertically on the first groove 105 due to the limiting and threaded structure. When facing a bearing ring with a larger radius, the position of the limiting block 2 is lowered, so that the gear 408 and the arc-shaped rack 102 can fully mesh and rotate. When facing a bearing ring with a smaller radius, the position of the limiting block 2 is raised, so that the gear 408 and the arc-shaped rack 102 can mesh and rotate briefly, thereby adaptively clamping the outer rings of bearings of different sizes.

[0029] When gear 408 rotates, ratchet 5 rotates synchronously. Spring 505 exerts tension on clamping tooth 504. When clamping tooth 504 is inserted into the tooth groove of ratchet 5, ratchet 5 can only rotate in one direction. When gear 408 disengages from arc-shaped rack 102, arc-shaped clamping block 405 can still maintain a fixed clamping state. After clamping is completed, subsequent processing work is carried out on the bearing ring.

[0030] After the outer ring of the bearing is machined, the drive assembly moves the clamping assembly to the second arc-shaped baffle 104. The second arc-shaped baffle 104 drives the paddle 503 to rotate the cleat 504 away from the fixed post 501, so that the cleat 504 does not contact the tooth groove of the ratchet 5. The second fixed plate 406 can rotate. At the same time, the drive assembly drives the arc-shaped clamping block 405 to rotate to the position of the first arc-shaped baffle 103. The arc surface of the first arc-shaped baffle 103 drives the arc-shaped clamping block 405 to move towards the first fixed plate 401, realizing the gathering of multiple arc-shaped clamping blocks 405, stopping the clamping for material removal and subsequent repeated work.

[0031] Although only certain components and embodiments of this application have been illustrated and described, many modifications and alterations will be apparent to those skilled in the art without actually departing from the scope and spirit of the claims, such as variations in the size, dimensions, structure, shape and proportion of the various elements, installation arrangement, material use, color, orientation, etc.

[0032] Finally, it should be noted that the above embodiments are only preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A bearing ring production positioning and clamping device, comprising a worktable (1) and a vertical platform (101) fixedly connected to the worktable (1); characterized in that: It also includes a drive assembly, a distance adjustment assembly and a tension release assembly mounted on the workbench (1), a connecting frame (302) mounted on the output end of the drive assembly, a clamping assembly slidably connected to the connecting frame (302) and a self-locking assembly mounted on the clamping assembly and the connecting frame (302), an arc-shaped rack (102) mounted on the stand (101), and a second groove (303) opened on the connecting frame (302). The clamping assembly includes an insert block (4) slidably connected to the second groove (303), a first fixed plate (401) mounted on the insert block (4), a first limiting groove (402) opened on the first fixed plate (401), a plurality of circularly distributed sliding rods (404) slidably connected to the first limiting groove (402), an arc-shaped clamping block (405) mounted on the sliding rods (404), a second limiting post (403) mounted on the sliding rods (404), a second fixed plate (406) rotatably connected to the first fixed plate (401), and a second limiting groove opened on the second fixed plate (406). 407) and the gear (408) mounted on the second fixed plate (406), the second limiting post (403) simultaneously limits the sliding on the first limiting groove (402) and the second limiting groove (407), the arc rack (102) and the gear (408) mesh with each other, when the driving component drives the connecting frame (302) to rotate, when the clamping component contacts the arc rack (102), the gear (408) rotates, the rotation of the gear (408) causes the second fixed plate (406) to rotate synchronously, and then the sliding rod (404) on the first fixed plate (401) slides in the direction away from or close to the first fixed plate (401).

2. The bearing ring production positioning and clamping device according to claim 1, characterized in that: The drive assembly includes a motor (3) mounted on the workbench (1) and a rotating disk (301) mounted on the output end of the motor (3). The rotating disk (301) and the connecting frame (302) are connected to each other.

3. The bearing ring production positioning and clamping device according to claim 1, characterized in that: The distance adjustment assembly includes a first groove (105) opened on the workbench (1), a limiting block (2) slidably connected to the first groove (105), an mounting block (202) mounted on the workbench (1), a stud (204) rotatably connected to the mounting block (202), a threaded sleeve (203) mounted on the limiting block (2), and a first limiting post (201) mounted on the workbench (1). The limiting block (2) is slidably set on the first limiting post (201). The stud (204) and the threaded sleeve (203) are threadedly connected. The rotation of the stud (204) drives the limiting block (2) to move vertically on the first groove (105).

4. The bearing ring production positioning and clamping device according to claim 3, characterized in that: The upper surface of the limiting block (2) is designed as an arc structure that gradually rises and then falls. The spatial position of the limiting block (2) is within the trajectory range formed by the drive component driving the insert (4) to move. When the drive component drives the insert (4) to rotate onto the limiting block (2), the limiting block (2) drives the insert (4) to make vertical displacement.

5. The bearing ring production positioning and clamping device according to claim 2, characterized in that: The self-locking assembly includes a rotating rod (502) rotatably connected to the connecting frame (302), a paddle (503) and a locking tooth (504) mounted on the rotating rod (502), and a fixed post (501) mounted on the connecting frame (302). A spring (505) is connected between the fixed post (501) and the locking tooth (504), and the spring (505) is used to drive the locking tooth (504) to rotate toward the fixed post (501).

6. The bearing ring production positioning and clamping device according to claim 1, characterized in that: The unwinding assembly includes a second arc-shaped baffle (104) mounted on the worktable (1) and a first arc-shaped baffle (103) mounted on the arc-shaped rack (102).

7. The bearing ring production positioning and clamping device according to claim 1, characterized in that: The second arc-shaped baffle (104) has an arc-shaped structure. The spatial position of the second arc-shaped baffle (104) is within the trajectory range formed by the drive component driving the paddle (503) to move. When the drive component drives the paddle (503) to rotate to the position of the second arc-shaped baffle (104), the second arc-shaped baffle (104) drives the teeth (504) on the paddle (503) to rotate toward the end away from the fixed post (501).

8. The bearing ring production positioning and clamping device according to claim 5, characterized in that: The upper surface of the arc-shaped clamp (405) is divided into L1 and L2. The upper end of the first arc-shaped baffle (103) is flush with the upper end of L1. When the drive assembly drives the arc-shaped clamp (405) to rotate to the position of the first arc-shaped baffle (103), the arc surface of the first arc-shaped baffle (103) drives the arc-shaped clamp (405) to move towards the first fixed plate (401).

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