A vehicle skin cutting device

Abstract

The utility model belongs to vehicle skin cutting technical field, concretely relates to a vehicle skin cutting device, including work bench, push material mechanism, roof and transmission mechanism, the utility model discloses through setting up push material mechanism, places vehicle skin at work bench top surface and close second U type board, control second servo motor drives second U type board removal and promotes vehicle skin removal to cutting mechanism bottom and carries out cutting, through setting up roof, when skin finishes cutting and removes forward, roof removes upward and roof top surface with work bench top surface flush can be convenient skin continues to remove, through setting up transmission mechanism, control second servo motor drives screw rod rotation can drive first bevel gear rotation simultaneously, thereby drive roof removal during skin removal, skin edge removal to cutting groove edge and just start to remove cutting groove, the height of roof reaches highest and roof top surface with work bench top surface flush, avoid skin contact cutting groove inner wall and lead to too big deformation.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle skin cutting technology, specifically relating to a vehicle skin cutting device. Background Technology

[0002] Vehicle skin is a thin sheet covering the outer surface of the vehicle body frame, protecting the frame and internal components from external environmental corrosion. In the event of a collision, the skin can absorb and disperse energy to a certain extent, reducing injury to passengers inside the vehicle. Skin is mostly made of metal sheets, but can also be made of materials such as plastic sheets, carbon fiber, and fiberglass.

[0003] Vehicle skin production requires the use of cutting devices. For example, the automated skin cutting equipment disclosed in the utility model with authorization announcement number CN221582149U can fix the skin by setting extrusion strips to hold it in place, so that workers do not need to press the skin by hand, thus reducing labor costs.

[0004] The existing technology still has the following problems when used: When the device completes the cutting of the skin, it controls the extrusion bar to move upward to detach from the skin, and then moves the skin forward. Because the skin material is relatively soft, during the movement of the skin, the skin above the cutting groove will bend downward and enter the cutting groove, hindering the skin from moving forward. Continuing to push the skin will produce a large deformation. Utility Model Content

[0005] The purpose of this invention is to provide a vehicle skin cutting device to solve the technical problems mentioned in the background.

[0006] The specific technical solution adopted in this utility model is as follows: A vehicle skin cutting device, comprising: A workbench, with a cutting mechanism mounted on top of the workbench; A pushing mechanism is disposed on the outer surface of the worktable and is used to push the skin to move on the top surface of the worktable. A top plate, which is disposed on the top of the workbench, moves upward to lift the skin that is bent downward; A transmission mechanism is disposed between the pushing mechanism and the top plate, and the transmission mechanism is used to periodically drive the top plate to move up and down during the movement of the skin.

[0007] In a preferred embodiment, support columns are fixedly installed at the four corners of the top of the workbench, and cover plates are fixedly installed on the top surface of the support columns.

[0008] In a preferred embodiment, the cutting mechanism includes a first cylinder, a first servo motor, and a cutting disc. The first cylinder is mounted on the bottom surface of the cover plate, the first servo motor is fixedly mounted on the bottom surface of the output end of the first cylinder, and the cutting disc is fixedly mounted on the end of the output end of the first servo motor.

[0009] In a preferred embodiment, a clamping mechanism is provided above the workbench. The clamping mechanism includes a second cylinder, a first U-shaped plate, and a pressure plate. The second cylinder is fixedly installed on the top surface of the cover plate. The first U-shaped plate is fixedly installed on the top surface of the output end of the second cylinder. The vertical portion of the first U-shaped plate passes through the cover plate and is slidably connected to the cover plate. The pressure plate is fixedly installed on the bottom surface of the vertical portion of the first U-shaped plate.

[0010] In a preferred embodiment, the pushing mechanism includes a second servo motor, a first mounting box, a second mounting box, a guide rod, a first moving block, a threaded rod, a second moving block, and a second U-shaped plate. The second servo motor is disposed outside the worktable. The second mounting box and the first mounting box are fixedly disposed on the front and rear sides of the worktable, respectively. A guide rod is fixedly disposed on the inner wall of the second mounting box. The first moving block is slidably connected to the outer side of the guide rod. The first moving block is slidably connected to the inner wall of the second mounting box. The housing of the second servo motor is fixedly connected to the first mounting box. The output end of the second servo motor passes through the first mounting box and is rotatably connected to it. A threaded rod is fixedly disposed at the end of the output end of the second servo motor. The threaded rod passes through the first mounting box and is rotatably connected to it via a bearing. The second moving block passes through the outer side of the threaded rod and is threadedly connected to it. A second U-shaped plate is fixedly disposed on the side of the first moving block and the second moving block that is far apart from each other.

[0011] In a preferred embodiment, the top surface of the workbench is provided with a groove adapted to the top plate, the top plate is slidably connected to the workbench through the groove, horizontal grooves are provided through the front and rear sides of the top plate, and multiple vertical grooves are provided on the top surface of the top plate that penetrate into the horizontal grooves.

[0012] In a preferred embodiment, the transmission mechanism includes a first bevel gear, a second bevel gear, a first rotating rod, a third bevel gear, a fourth bevel gear, a second rotating rod, a cam, and a fixed plate. The first bevel gear is fixedly mounted on the end of the threaded rod furthest from the second servo motor. The second bevel gear meshes with the outer side of the first bevel gear. The first rotating rod is fixedly mounted on the side of the second bevel gear. The third bevel gear is fixedly mounted on the other side of the first rotating rod. The fourth bevel gear meshes with the outer side of the third bevel gear. The second rotating rod passes through the side of the fourth bevel gear and is fixedly connected to the second rotating rod. The left and right ends of the second rotating rod are rotatably connected to the inner wall of the groove via bearings. A cam passes through the outer side of the second rotating rod, and the second rotating rod is fixedly connected to the cam. The cam is located on the bottom surface of the top plate. Two fixed plates are fixedly mounted on the bottom surface inside the groove. The first rotating rod passes through the fixed plates and is rotatably connected to them. The sides of the second and third bevel gears are rotatably connected to the fixed plates.

[0013] The technical effects achieved by this utility model are as follows: This utility model sets up a pushing mechanism to place the vehicle skin on the top surface of the workbench and close to the second U-shaped plate. By controlling the second servo motor to drive the threaded rod to rotate, the second moving block can be moved along the inner wall of the first mounting box. The movement of the second moving block, together with the first moving block, drives the second U-shaped plate to move. The movement of the second U-shaped plate pushes the vehicle skin to the bottom of the cutting mechanism for cutting. This utility model features a top plate. When the skin finishes cutting and moves forward, the top plate moves upward and its top surface is flush with the top surface of the worktable, which facilitates the continued movement of the skin. The vertical groove facilitates the collection of debris generated by the cutting mechanism, and the horizontal groove facilitates the cleaning of debris collected inside the top plate. This invention, through the setting of a transmission mechanism, controls the second servo motor to drive the threaded rod to rotate, which in turn drives the first bevel gear to rotate, thereby driving the cam to rotate. The rotation of the cam can drive the top plate to move up and down periodically, thus driving the top plate to move up and down during the movement of the skin. When the edge of the skin moves to the edge of the groove and just begins to move away from the groove, the height of the top plate reaches its maximum and the top surface of the top plate is flush with the top surface of the worktable, avoiding excessive deformation caused by the skin contacting the inner wall of the groove, and improving work efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the material pushing mechanism of this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the workbench of this utility model; Figure 4 This is a utility model Figure 3 A magnified view of the structure at point A in the middle; Figure 5 This is a schematic diagram of the top plate structure of this utility model.

[0015] The attached diagram lists the components represented by each number as follows: 100. Workbench; 101. Support column; 102. Cover plate; 200. Cutting mechanism; 201. First cylinder; 202. First servo motor; 203. Cutting disc; 300. Clamping mechanism; 301. Second cylinder; 302. First U-shaped plate; 303. Pressure plate; 400. Pushing mechanism; 401. Second servo motor; 402. First mounting box; 403. Second mounting box; 404. Guide rod; 405. First moving block; 406. Threaded rod; 407. Second moving block; 408. Second U-shaped plate; 500, Top plate; 501, Vertical groove; 502, Horizontal groove; 600. Transmission mechanism; 601. First bevel gear; 602. Second bevel gear; 603. First rotating rod; 604. Third bevel gear; 605. Fourth bevel gear; 606. Second rotating rod; 607. Cam; 608. Fixed plate. Detailed Implementation

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of this utility model. However, this utility model may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0018] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this utility model. The phrase "in a preferred embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0019] Secondly, this utility model is described in detail with reference to the schematic diagrams. When detailing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0020] Please see the appendix Figures 1 to 2As shown, this utility model provides a vehicle skin cutting device, including: a worktable 100, a pushing mechanism 400, a top plate 500, and a transmission mechanism 600. Support columns 101 are fixedly installed at the four corners of the top of the worktable 100, and a cover plate 102 is fixedly installed on the top surface of the support columns 101. A cutting mechanism 200 and a pressing mechanism 300 are installed above the worktable 100. The vehicle skin is placed on the top surface of the worktable 100. The cutting mechanism 200 is used to cut the skin, and the pressing mechanism 300 is used to press and fix the skin near the part to be cut. A controller is installed on the outer surface of the worktable 100.

[0021] In a preferred embodiment, please refer to Figures 1 to 2 The cutting mechanism 200 consists of a first cylinder 201, a first servo motor 202, and a cutting disc 203. The first cylinder 201 is mounted on the bottom surface of the cover plate 102. A matching solenoid valve is mounted on the first cylinder 201. The first servo motor 202 is fixedly mounted on the bottom surface of the output end of the first cylinder 201. The cutting disc 203 is fixedly mounted on the end of the output end of the first servo motor 202. An electric slide rail is mounted on the bottom surface of the cover plate 102 in the front-back direction. A matching electric slider is installed inside the electric slide rail. The bottom surface of the electric slider is fixedly connected to the outer shell of the first cylinder 201. The electric slide rail, the electric slider, the solenoid valve of the first cylinder 201, and the first servo motor 202 are electrically connected to the controller through wires.

[0022] In a preferred embodiment, please refer to Figures 1 to 2 A clamping mechanism 300 is provided above the workbench 100. The clamping mechanism 300 consists of a second cylinder 301, a first U-shaped plate 302, and a pressure plate 303. The second cylinder 301 is fixedly installed on the top surface of the cover plate 102. A matching solenoid valve is installed on the second cylinder 301. The solenoid valve of the second cylinder 301 is electrically connected to the controller through a wire. The first U-shaped plate 302 is fixedly installed on the top surface of the output end of the second cylinder 301. The vertical part of the first U-shaped plate 302 passes through the cover plate 102 and is slidably connected to the cover plate 102. The pressure plate 303 is fixedly installed on the bottom surface of the vertical part of the first U-shaped plate 302.

[0023] In a preferred embodiment, please refer to Figures 1 to 2The outer surface of the workbench 100 is provided with a pushing mechanism 400, which consists of a second servo motor 401, a first mounting box 402, a second mounting box 403, a guide rod 404, a first moving block 405, a threaded rod 406, a second moving block 407, and a second U-shaped plate 408. The second servo motor 401 is provided on the outside of the workbench 100 and is electrically connected to the controller through a wire. The second mounting box 403 and the first mounting box 402 are fixedly provided on the front and rear sides of the workbench 100, respectively. The guide rod 404 is fixedly provided on the inner wall of the second mounting box 403, and the first moving block 405 is provided through the outer side of the guide rod 404. The guide rod 404 and the first moving block are connected. 405 is slidably connected. The first moving block 405 is slidably connected to the inner wall of the second mounting box 403. The housing of the second servo motor 401 is fixedly connected to the first mounting box 402. The output end of the second servo motor 401 passes through the first mounting box 402 and is rotatably connected to the first mounting box 402. A threaded rod 406 is fixedly provided at the end of the output end of the second servo motor 401. The threaded rod 406 passes through the first mounting box 402 and is rotatably connected to the first mounting box 402 through a bearing. A second moving block 407 is provided through the outer side of the threaded rod 406. The threaded rod 406 and the second moving block 407 are threadedly connected. A second U-shaped plate 408 is fixedly provided on the side of the first moving block 405 and the second moving block 407 that are far apart from each other. The bottom surface of the horizontal part of the second U-shaped plate 408 is slidably connected to the top surface of the worktable 100.

[0024] In this embodiment, the vehicle skin is placed on the top surface of the workbench 100 and pressed against the second U-shaped plate 408. The second servo motor 401 is controlled to drive the threaded rod 406 to rotate, which in turn drives the second moving block 407 to move along the inner wall of the first mounting box 402. The movement of the second moving block 407, in conjunction with the first moving block 405, drives the second U-shaped plate 408 to move. The movement of the second U-shaped plate 408 pushes the vehicle skin to move. When the skin moves to the designated position at the bottom of the cutting mechanism 200, the second cylinder 301 is controlled to drive the first U-shaped plate 302 to move downward, thereby driving the pressure plate 303 to move downward to press and fix the area near the part of the skin to be cut. The first servo motor 202 is controlled to drive the cutting disc 203 to rotate, and the first cylinder 201 is controlled to drive the cutting disc 203 to move downward. Then, the electric slide rail is controlled in conjunction with the electric slider to drive the cutting disc 203 to move back and forth, which can cut the skin.

[0025] In a preferred embodiment, please refer to Figures 1 to 5 The top surface of the workbench 100 is provided with a top plate 500, and the top surface of the workbench 100 is provided with a groove adapted to the top plate 500. The top plate 500 is slidably connected to the workbench 100 through the groove. The top surface of the top plate 500 is provided with multiple vertical grooves 501, and horizontal grooves 502 are provided through the front and rear sides of the top plate 500. The vertical grooves 501 and the horizontal grooves 502 are connected.

[0026] In this embodiment, the cutting disc 203 never contacts the top plate 500 during its downward movement. The vertical groove 501 facilitates the collection of debris generated by the cutting mechanism 200, and the horizontal groove 502 facilitates the cleaning of debris collected inside the top plate 500. When the skin completes the cutting and moves forward, the skin located above the cutting groove bends downward into the cutting groove. The top plate 500 moves upward and contacts the skin, causing the skin to rotate upward. When the top surface of the top plate 500 is flush with the top surface of the worktable 100, the skin can continue to move.

[0027] In a preferred embodiment, please refer to Figures 1 to 4 The transmission mechanism 600 consists of a first bevel gear 601, a second bevel gear 602, a first rotating rod 603, a third bevel gear 604, a fourth bevel gear 605, a second rotating rod 606, a cam 607, and a fixed plate 608. The first bevel gear 601 is fixedly mounted on the end of the threaded rod 406 away from the second servo motor 401. The second bevel gear 602 meshes with the outer side of the first bevel gear 601. The first rotating rod 603 is fixedly mounted on the side of the second bevel gear 602. The third bevel gear 604 is fixedly mounted on the other side of the first rotating rod 603. The fourth bevel gear 605 meshes with the outer side of the third bevel gear 604. The fourth bevel gear 605 extends through the side of the fourth bevel gear 605. A second rotating rod 606 is provided, and a fourth bevel gear 605 is fixedly connected to the second rotating rod 606. The left and right ends of the second rotating rod 606 are rotatably connected to the inner wall of the groove through bearings. A cam 607 is provided through the outer side of the second rotating rod 606, and the second rotating rod 606 is fixedly connected to the cam 607. The cam 607 is provided on the bottom surface of the top plate 500. Two fixing plates 608 are fixedly provided on the bottom surface of the groove. A first rotating rod 603 passes through the fixing plate 608 and is rotatably connected to the fixing plate 608. The sides of the second bevel gear 602 and the third bevel gear 604 are rotatably connected to the fixing plate 608 respectively. The fixing plate 608 is used to support the first rotating rod 603.

[0028] In this embodiment, controlling the second servo motor 401 to drive the threaded rod 406 to rotate can simultaneously drive the first bevel gear 601 to rotate. The rotation of the first bevel gear 601 drives the second bevel gear 602 to rotate. The rotation of the second bevel gear 602 drives the first rotating rod 603 and the third bevel gear 604 to rotate. The rotation of the third bevel gear 604 drives the fourth bevel gear 605 to rotate. The rotation of the fourth bevel gear 605 drives the second rotating rod 606 and the cam 607 to rotate. The rotation of the cam 607 can drive the top plate 500 to move up and down periodically. Thus, during the skin movement, the top plate 500 is driven to move up and down. When the edge of the skin moves to the edge of the groove and just begins to move away from the groove, the height of the top plate 500 reaches its maximum and the top surface of the top plate 500 is flush with the top surface of the worktable 100. This avoids the skin from contacting the inner wall of the groove, which would cause excessive deformation and improves work efficiency.

[0029] The working principle of this utility model is as follows: When using the device, the vehicle skin is placed on the top surface of the workbench 100 and pressed against the second U-shaped plate 408. The second servo motor 401 drives the threaded rod 406 to rotate, which in turn drives the second moving block 407 to move along the inner wall of the first mounting box 402. The movement of the second moving block 407, in conjunction with the first moving block 405, drives the second U-shaped plate 408 to move. The movement of the second U-shaped plate 408 pushes the vehicle skin to move. When the skin moves to the designated position at the bottom of the cutting mechanism 200, the second cylinder 301 is controlled to drive the first U-shaped plate 302 to move downward, thereby driving the pressure plate 303 to move downward to press and fix the area near the part of the skin to be cut. The first servo motor 202 is controlled to drive the cutting disc 203 to rotate, and the first cylinder 201 is controlled to drive the cutting disc 203 to move downward. Then, the electric slide rail is controlled in conjunction with the electric slider to drive the cutting disc 203 to move back and forth to cut the skin. The vertical groove 501 facilitates the collection of debris generated by the cutting mechanism 200, and the horizontal groove 502 facilitates the cleaning of debris collected inside the top plate 500.

[0030] When the device completes the cutting of the skin, it controls the first cylinder 201 to move the cutting disc 203 upward to its original position, controls the second cylinder 301 to move the pressure plate 303 upward, and controls the second servo motor 401 to move the skin further. The skin above the cutting groove bends downward into the cutting groove. The second servo motor 401 drives the threaded rod 406 to rotate, which in turn drives the first bevel gear 601 to rotate. The rotation of the first bevel gear 601 drives the second bevel gear 602 to rotate, and the rotation of the second bevel gear 602 drives the first rotating rod 603 and the third... The rotation of bevel gear 604 drives the rotation of the fourth bevel gear 605, which in turn drives the rotation of the second rotating rod 606 and the cam 607. The rotation of the cam 607 can drive the top plate 500 to move upward. The top plate 500 moves upward and contacts the skin, causing the skin to rotate upward. When the edge of the skin moves to the edge of the groove and just begins to move away from the groove, the height of the top plate 500 reaches its maximum and the top surface of the top plate 500 is flush with the top surface of the worktable 100. This avoids the skin from contacting the inner wall of the groove, which would cause excessive deformation and improves work efficiency.

[0031] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the art.

Claims

1. A vehicle skin cutting device, characterized in that: include: A workbench (100) is provided above the workbench (100) and a cutting mechanism (200) is provided above it. A pushing mechanism (400) is provided on the outer surface of the worktable (100) and is used to push the skin to move on the top surface of the worktable (100); Top plate (500), the top plate (500) is disposed on the top of the workbench (100), and the top plate (500) moves upward to lift the downwardly bent skin; A transmission mechanism (600) is disposed between the pusher mechanism (400) and the top plate (500), and the transmission mechanism (600) is used to periodically drive the top plate (500) to move up and down during the skin movement.

2. The vehicle skin cutting device according to claim 1, characterized in that: The workbench (100) has four fixed support columns (101) at its top corners, and the top surface of the support columns (101) has a fixed cover plate (102).

3. The vehicle skin cutting device according to claim 2, characterized in that: The cutting mechanism (200) includes a first cylinder (201), a first servo motor (202) and a cutting disc (203). The first cylinder (201) is installed on the bottom surface of the cover plate (102). The first servo motor (202) is fixedly installed on the bottom surface of the output end of the first cylinder (201). The cutting disc (203) is fixedly installed at the end of the output end of the first servo motor (202).

4. The vehicle skin cutting device according to claim 2, characterized in that: A clamping mechanism (300) is provided above the workbench (100). The clamping mechanism (300) includes a second cylinder (301), a first U-shaped plate (302), and a pressure plate (303). The second cylinder (301) is fixedly installed on the top surface of the cover plate (102). The first U-shaped plate (302) is fixedly installed on the top surface of the output end of the second cylinder (301). The vertical part of the first U-shaped plate (302) passes through the cover plate (102) and is slidably connected to the cover plate (102). The pressure plate (303) is fixedly installed on the bottom surface of the vertical part of the first U-shaped plate (302).

5. The vehicle skin cutting device according to claim 1, characterized in that: The feeding mechanism (400) includes a second servo motor (401), a first mounting box (402), a second mounting box (403), a guide rod (404), a first moving block (405), a threaded rod (406), a second moving block (407), and a second U-shaped plate (408). The second servo motor (401) is provided on the outside of the worktable (100). The second mounting box (403) and the first mounting box (402) are fixedly provided on the front and rear sides of the worktable (100), respectively. The guide rod (404) is fixedly provided on the inner wall of the second mounting box (403). The first moving block (405) is provided through the outer side of the guide rod (404). The guide rod (404) and the first moving block (405) are slidably connected. The first moving block (407) and the first U-shaped plate (408) are connected through the guide rod (401), the first moving block (406), the first moving block (407), and the first U-shaped plate (408). The inner wall of the second mounting box (403) is slidably connected. The outer shell of the second servo motor (401) is fixedly connected to the first mounting box (402). The output end of the second servo motor (401) passes through the first mounting box (402) and is rotatably connected to the first mounting box (402). A threaded rod (406) is fixedly provided at the end of the output end of the second servo motor (401). The threaded rod (406) passes through the first mounting box (402) and is rotatably connected to the first mounting box (402) through a bearing. A second moving block (407) is provided through the outer side of the threaded rod (406). The threaded rod (406) is threadedly connected to the second moving block (407). A second U-shaped plate (408) is fixedly provided on the side of the first moving block (405) and the second moving block (407) that are far away from each other.

6. The vehicle skin cutting device according to claim 1, characterized in that: The top surface of the workbench (100) is provided with a groove adapted to the top plate (500). The top plate (500) is slidably connected to the workbench (100) through the groove. Horizontal grooves (502) are provided through the front and rear sides of the top plate (500). Multiple vertical grooves (501) are provided on the top surface of the top plate (500) that penetrate into the horizontal grooves (502).

7. A vehicle skin cutting device according to claim 5, characterized in that: The transmission mechanism (600) includes a first bevel gear (601), a second bevel gear (602), a first rotating rod (603), a third bevel gear (604), a fourth bevel gear (605), a second rotating rod (606), a cam (607), and a fixed plate (608). The first bevel gear (601) is fixedly mounted on one end of the threaded rod (406) away from the second servo motor (401). The second bevel gear (602) meshes with the outer side of the first bevel gear (601). The first rotating rod (603) is fixedly mounted on the side of the second bevel gear (602). The third bevel gear (604) is fixedly mounted on the other side of the first rotating rod (603). The fourth bevel gear (605) meshes with the outer side of the third bevel gear (604). The fourth bevel gear (605) has a second rotating rod (606) through its side. The fourth bevel gear (605) is fixedly connected to the second rotating rod (606). The left and right ends of the second rotating rod (606) are rotatably connected to the inner wall of the groove through bearings. A cam (607) is through its outer side. The second rotating rod (606) is fixedly connected to the cam (607). The cam (607) is located on the bottom surface of the top plate (500). Two fixing plates (608) are fixedly installed on the bottom surface inside the groove. The first rotating rod (603) passes through the fixing plate (608) and is rotatably connected to the fixing plate (608). The sides of the second bevel gear (602) and the third bevel gear (604) are rotatably connected to the fixing plate (608) respectively.

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