Plate cutting device

Abstract

The utility model discloses a plate cutting device which comprises an operation table, supporting columns are fixedly connected to the four end corners of the lower end of the operation table, a first notch is formed in the middle of the upper end of the operation table and penetrates through the bottom of the operation table, and a transmission mechanism is arranged in the first notch. Clamping mechanisms are arranged at the two ends of the upper end of the operation table and located on the transmission mechanism, the two clamping mechanisms are symmetrically arranged, and the two sides of the two ends of the operation table are fixedly connected with fixing columns. According to the plate cutting device provided by the utility model, through the structural matching design of the transmission mechanism and the two clamping mechanisms, when plates with different sizes and thicknesses need to be cut, the two clamping mechanisms can be driven by the transmission mechanism to clamp the plates; and the two clamping mechanisms are used for clamping the plate, so that the situation that the cutting of the plate is influenced by the movement of the plate after the cutting equipment cuts the plate can be prevented, and the cutting efficiency of the plate is improved.

Description

Technical Field

[0001] This utility model relates to the field of sheet metal cutting technology, and in particular to a sheet metal cutting device. Background Technology

[0002] In the mechanical design and manufacturing industry, in order to meet the needs of different places, it is usually necessary to cut the plates into plates of different lengths for easy use. Plates are generally cut using a cutting machine.

[0003] Referring to patent number CN212089026U, a mechanical metal parts cutting device is described as follows: It includes a protective housing, a lifting cylinder mounted on the top of the housing, a connecting plate horizontally fixed to the telescopic end of the lifting cylinder, a bracket fixed to the bottom of the connecting plate, a mounting plate connected to the bottom of the bracket via a rotating shaft, a cutting motor mounted on one side wall of the mounting plate, a cutting blade connected to the output end of the cutting motor, an angle-adjusting cylinder connected between hinge seat one and hinge seat two, a rotary motor mounted at the bottom of the inner cavity of the protective housing, a workpiece table connected to the output end of the rotary motor, and clamping devices fixed on both sides of the top of the workpiece table. The device features a novel structural design, allowing the metal parts to rotate. The cutting blade can be used for vertical or angled cutting, controlled by the angle-adjusting cylinder, thus improving the applicability of cutting metal parts. Simultaneously, the waste gas generated during cutting is absorbed by a vacuum cleaner.

[0004] However, during the actual implementation process, the applicant discovered the following problems with the patent:

[0005] In practical applications, this patent can only clamp the two sides of the board. After the board is cut open by the cutting blade, the clamped board will loosen, affecting the overall cutting of the board and thus reducing the efficiency of cutting the board.

[0006] Therefore, it is necessary to propose a plate cutting device to provide a new technical solution for solving the above-mentioned technical problems. Utility Model Content

[0007] Based on this, it is necessary to provide a plate cutting device to address the aforementioned technical problems. Through the structural design of the transmission mechanism and two clamping mechanisms, it can be seen that when cutting plates of different sizes and thicknesses, the transmission mechanism can drive the two clamping mechanisms to clamp the plates. The clamping of the plates by the two clamping mechanisms can prevent the plates from moving after the cutting equipment has cut them, thus preventing any impact on the cutting process and improving the efficiency of plate cutting.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A sheet metal cutting device, which is applied to mechanical design and manufacturing.

[0010] The aforementioned sheet metal cutting device specifically includes a protective plate and an operating table. Support columns are fixedly connected to the four corners of the lower end of the operating table. A first slot is formed in the middle of the upper end of the operating table, penetrating the bottom of the operating table. A transmission mechanism is installed inside the first slot. Clamping mechanisms are installed at both ends of the upper end of the operating table and on the transmission mechanism, with the two clamping mechanisms arranged symmetrically. Fixed columns are fixedly connected to both sides of both ends of the operating table. A fixed seat is installed between the upper ends of the two fixed columns at the same end. The lower ends of the fixed seats are fixedly connected to the fixed columns at both ends. A guide rod is installed on one side between the two fixed seats, with both ends fixedly connected to the fixed seats at both ends. A reciprocating screw is installed on the other side between the two fixed seats, with both ends rotatably connected to the fixed seats at both ends. A first motor is installed at one end of the reciprocating screw, fixed on the outer side of the fixed seat away from the reciprocating screw and corresponding to the reciprocating screw. The output end of the first motor passes through the fixed seat and is fixedly connected to the reciprocating screw. A cutting device is installed between the reciprocating screw and the guide rod.

[0011] In a preferred embodiment of the plate cutting device provided by this utility model, the cutting device includes a connecting seat, one end of which is slidably connected to a guide rod, and the other end of which is threadedly connected to a reciprocating lead screw. A second slot is provided in the middle of the connecting seat, and a moving mechanism is provided inside the second slot. A first slide is slidably connected inside the second slot, and the first slide is connected to the moving mechanism. A telescopic rod is fixedly connected to the middle of the lower end of the first slide, and a cutting machine is fixedly connected to the telescopic end of the lower end of the telescopic rod.

[0012] In a preferred embodiment of the plate cutting device provided by this utility model, the transmission mechanism includes a connecting plate located at the center of the first slot. First screws are fixedly connected to both sides of the connecting plate. The end of each first screw away from the connecting plate is rotatably connected to both ends inside the first slot. A second motor is installed at the end of one of the first screws away from the connecting plate. The second motor is fixed to the outside of the operating table and corresponds to the position of the first screw. A connecting rod is fixedly connected to the output end of the second motor. The end of the connecting rod away from the second motor passes through the operating table and is fixedly connected to the first screw.

[0013] In a preferred embodiment of the plate cutting device provided by this utility model, the clamping mechanism includes a second slide block. The two second slide blocks are respectively threadedly connected to two first screws on both sides of the connecting plate inside the first slot. The second slide blocks are slidably connected to the first slot. A base is fixedly connected to the upper end of the second slide block. The lower end of the base is slidably connected to the operating table. The ends of the two bases that are close to each other are inclined. The ends of the two bases that are far apart from each other are fixedly connected to a fixing frame. A clamping plate is provided at the upper end of the base and at the lower end of the fixing frame.

[0014] In a preferred embodiment of the plate cutting device provided by this utility model, the upper and lower ends of the clamping plate are fixedly connected to the first sliders, and the base and the fixing frame are provided with first sliding grooves at positions corresponding to the first sliders. The first sliders are slidably connected to the first sliding grooves. The two ends of the clamping plate near the fixing frame are fixedly connected to the springs, and the side of the springs away from the clamping plate is fixedly connected to the fixing frame. The two ends of the clamping plate away from the fixing frame are provided with fixing mechanisms.

[0015] In a preferred embodiment of the plate cutting device provided by this utility model, the fixing mechanism includes a third slider. A third slot is provided at both ends of the upper end of the fixing frame and at positions corresponding to the third slider. The third slider is located inside the third slot and slidably connected to it. A rotating handle is provided at the upper end of the third slider. A second screw is fixedly connected to the middle of the lower end of the rotating handle. The lower end of the second screw passes through the third slider and extends to the outer side of the lower end of the fixing frame, where a bearing is fixedly connected. A clamping pad is fixedly connected to the lower end of the bearing. A second slider is fixedly connected to the side of the clamping pad near the bearing. A second sliding groove is provided at positions corresponding to the bearing and the second slider, and the second slider is slidably connected to the second sliding groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides a plate cutting device. Through the structural design of the transmission mechanism and two clamping mechanisms, it can be seen that when it is necessary to cut plates of different sizes and thicknesses, the transmission mechanism can drive the two clamping mechanisms to clamp the plates. The clamping of the plates by the two clamping mechanisms can prevent the plates from moving after the cutting equipment cuts them, thus preventing the cutting from affecting the cutting process and improving the efficiency of plate cutting.

[0018] The present invention provides a plate cutting device. Through the structural design of the fixing mechanism, it can be seen that after the plate is clamped by two clamping mechanisms, the four corners of the plate can be fixed according to the thickness of the plate, so as to prevent the plate from shifting after cutting and thus improve the stability of plate cutting. Attached Figure Description

[0019] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the overall structure of a plate cutting device provided by this utility model;

[0021] Figure 2 A schematic diagram of the structure of a plate cutting device provided by this utility model;

[0022] Figure 3 A schematic diagram of the transmission mechanism of a sheet metal cutting device provided by this utility model;

[0023] Figure 4 A schematic diagram of the clamping mechanism of a plate cutting device provided by this utility model;

[0024] Figure 5 A schematic diagram of the structure of the second slide of the plate cutting device provided by this utility model;

[0025] Figure 6 A schematic diagram of the structure of the spring and the first slider of the plate cutting device provided by this utility model;

[0026] Figure 7 An enlarged view of a sheet metal cutting device A provided by this utility model;

[0027] Figure 8 This is a structural schematic diagram of a fixing mechanism for a sheet metal cutting device provided by this utility model.

[0028] The markings in the diagram are explained as follows:

[0029] 1. Operating table; 2. Support column; 3. First slot; 4. Transmission mechanism; 5. Fixed column; 6. Fixed seat; 7. Guide rod; 8. Reciprocating lead screw; 9. First motor; 10. Cutting equipment; 11. Clamping mechanism; 12. Connecting seat; 13. Second slot; 14. Moving mechanism; 15. First slide; 16. Telescopic rod; 17. Cutting machine; 18. Connecting plate; 19. First screw; 20. Second screw; 21. Second motor; 22. Connecting rod; 23. Base; 24. Fixed frame; 25. Second slide; 26. Clamping plate; 27. Third slot; 28. Fixed mechanism; 29. ​​First slide groove; 30. Rotary handle; 31. Spring; 32. First slider; 33. Second slide groove; 34. Clamping pad; 35. Second slider; 36. Bearing; 37. Third slider. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0031] As described in the background art, in the specific application of this patent, only the two sides of the plate can be clamped. After the plate is cut open by the cutting blade, the clamped plate will loosen, which will affect the overall cutting of the plate and reduce the efficiency of cutting the plate.

[0032] To solve this technical problem, this utility model provides a plate cutting device that is applied to mechanical design and manufacturing.

[0033] For details, please refer to Figure 1A sheet metal cutting device specifically includes an operating table 1. Support columns 2 are fixedly connected to the four corners of the lower end of the operating table 1. A first slot 3 is formed in the middle of the upper end of the operating table 1, penetrating the bottom of the operating table 1. A transmission mechanism 4 is installed inside the first slot 3. Clamping mechanisms 11 are installed at both ends of the upper end of the operating table 1, located on the transmission mechanism 4, and are symmetrically arranged. Fixed columns 5 are fixedly connected to both sides of both ends of the operating table 1. A fixed seat 6 is installed between the upper ends of the two fixed columns 5 at the same end. The lower ends of the fixed seat 6 are respectively connected to the two ends of the operating table 1. The fixed column 5 is fixedly connected, and a guide rod 7 is provided on one side between the two fixed seats 6. The two ends of the guide rod 7 are fixedly connected to the fixed seats 6 at both ends respectively. A reciprocating screw 8 is provided on the other side between the two fixed seats 6. The two ends of the reciprocating screw 8 are rotatably connected to the fixed seats 6 at both ends respectively. A first motor 9 is provided at one end of the reciprocating screw 8. The first motor 9 is fixed on the outside of the fixed seat 6 away from the reciprocating screw 8 and corresponds to the reciprocating screw 8. The output end of the first motor 9 passes through the fixed seat 6 and is fixedly connected to the reciprocating screw 8. A cutting device 10 is provided between the reciprocating screw 8 and the guide rod 7.

[0034] The present invention provides a plate cutting device. Through the structural cooperation design of the transmission mechanism 4 and the two clamping mechanisms 11, it can be seen that when it is necessary to cut plates of different sizes and thicknesses, the transmission mechanism 4 can drive the two clamping mechanisms 11 to clamp the plates. The clamping of the plates by the two clamping mechanisms 11 can prevent the plates from moving after the cutting equipment 10 cuts the plates, thus preventing the cutting of the plates from being affected and improving the efficiency of plate cutting.

[0035] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0036] Example 1:

[0037] Please refer to Figure 1 - Figure 7A sheet metal cutting device includes an operating table 1. Support columns 2 are fixedly connected to the four corners of the lower end of the operating table 1. A first slot 3 is formed in the middle of the upper end of the operating table 1, penetrating the bottom of the operating table 1. A transmission mechanism 4 is installed inside the first slot 3. Clamping mechanisms 11 are installed at both ends of the upper end of the operating table 1, located on the transmission mechanism 4, and are symmetrically arranged. Fixed columns 5 are fixedly connected to both sides of both ends of the operating table 1. A fixing seat 6 is installed between the upper ends of the two fixing columns 5 at the same end. The lower ends of the fixing seat 6 are respectively connected to the two ends of the operating table 1. The fixed column 5 is fixedly connected, and a guide rod 7 is provided on one side between the two fixed seats 6. The two ends of the guide rod 7 are fixedly connected to the fixed seats 6 at both ends respectively. A reciprocating screw 8 is provided on the other side between the two fixed seats 6. The two ends of the reciprocating screw 8 are rotatably connected to the fixed seats 6 at both ends respectively. A first motor 9 is provided at one end of the reciprocating screw 8. The first motor 9 is fixed on the outside of the fixed seat 6 away from the reciprocating screw 8 and corresponds to the reciprocating screw 8. The output end of the first motor 9 passes through the fixed seat 6 and is fixedly connected to the reciprocating screw 8. A cutting device 10 is provided between the reciprocating screw 8 and the guide rod 7.

[0038] Through the above structural design, it can be seen that the operating table 1 can be supported by the support column 2, the transmission mechanism 4 can drive the two clamping mechanisms 11 to clamp and fix plates of different sizes and thicknesses, the fixing column 5 can support the fixing seat 6, the cutting device 10 can cut the plates clamped by the two clamping mechanisms 11, the first motor 9 can drive the reciprocating lead screw 8 to rotate, and the rotation of the reciprocating lead screw 8 can drive the cutting device 10 to move on the guide rod 7 and the reciprocating lead screw 8.

[0039] Specifically, the cutting device 10 includes a connecting seat 12. One end of the connecting seat 12 is slidably connected to the guide rod 7, and the other end of the connecting seat 12 is threadedly connected to the reciprocating lead screw 8. A second slot 13 is provided in the middle of the connecting seat 12. A moving mechanism 14 is provided inside the second slot 13. A first slide block 15 is slidably connected inside the second slot 13. The first slide block 15 is connected to the moving mechanism 14. A telescopic rod 16 is fixedly connected to the middle of the lower end of the first slide block 15. A cutting machine 17 is fixedly connected to the telescopic end of the lower end of the telescopic rod 16.

[0040] Through the above structural design, it can be seen that when the position of the plate needs to be adjusted, the first motor 9 can be started, and the output end of the first motor 9 will drive the reciprocating lead screw 8 to rotate. When the reciprocating lead screw 8 rotates, the reciprocating lead screw 8 drives the connecting seat 12 to move on the guide rod 7 and the reciprocating lead screw 8. When the connecting seat 12 moves, the connecting seat 12 can drive the position of the cutting machine 17 to move. The moving mechanism 14 inside the second slot 13 can drive the first slide 15 to move inside the second slot 13. The movement of the first slide 15 can drive the position of the cutting machine 17 to move. The height of the cutting machine 17 can be quickly adjusted by the telescopic rod 16. The cutting machine 17 can cut the plate clamped between the two clamping mechanisms 11.

[0041] Specifically, the transmission mechanism 4 includes a connecting plate 18, which is located in the middle of the first slot 3. Both sides of the connecting plate 18 are fixedly connected to first screws 19. The end of the first screw 19 away from the connecting plate 18 is rotatably connected to both ends inside the first slot 3. A second motor 21 is provided at the end of one of the first screws 19 away from the connecting plate 18. The second motor 21 is fixed on the outside of the operating table 1 and corresponds to the position of the first screw 19. The output end of the second motor 21 is fixedly connected to a connecting rod 22. The end of the connecting rod 22 away from the second motor 21 passes through the operating table 1 and is fixedly connected to the first screw 19.

[0042] Specifically, the clamping mechanism 11 includes a second slide block 25. The two second slide blocks 25 are respectively threaded to two first screws 19 on both sides of the connecting plate 18 inside the first slot 3. The second slide block 25 is slidably connected to the first slot 3. The upper end of the second slide block 25 is fixedly connected to a base 23. The lower end of the base 23 is slidably connected to the operating table 1. The ends of the two bases 23 that are close to each other are inclined. The ends of the two bases 23 that are far apart from each other are fixedly connected to a fixing frame 24. A clamping plate 26 is provided on the upper end of the base 23 and at the lower end of the fixing frame 24.

[0043] Furthermore, the upper and lower ends of the clamping plate 26 are fixedly connected to the first slider 32. The base 23 and the fixing frame 24 are each provided with a first sliding groove 29 at the position corresponding to the first slider 32. The first slider 32 is slidably connected to the first sliding groove 29. The two ends of the clamping plate 26 near the fixing frame 24 are fixedly connected to the spring 31. The side of the spring 31 away from the clamping plate 26 is fixedly connected to the fixing frame 24. The two ends of the clamping plate 26 away from the fixing frame 24 are provided with fixing mechanisms 28.

[0044] Through the above structural design, it can be seen that when clamping plates of different sizes is required, the second motor 21 can be started. After the second motor 21 is started, its output end drives the connecting rod 22 to rotate. When the connecting rod 22 rotates, it drives one of the first screws 19 to rotate. The rotation of the first screw 19 can drive the other first screw 19 to rotate synchronously through the connecting plate 18. The rotation of the two first screws 19 can drive the two second slides 25 to move closer to each other inside the first slot 3. The movement of the two second slides 25 can drive the two bases to move closer together. 23 are brought closer together at the upper end of the operating table 1. When the two bases 23 are close together, the plate can be pushed up by the inclined surface of the base 23 when the plate is squeezed. As the two bases 23 continue to approach each other, one side of the plate squeezes the clamping plate 26. The clamping plate 26 drives the first slider 32 to slide away from the plate inside the first slide groove 29, thus squeezing the spring 31. The spring 31 stores the squeezing force. After the clamping of both sides of the plate is completed, the position of the plate can be fixed by the fixing mechanism 28.

[0045] Example 2:

[0046] The sheet metal cutting device provided in Example 1 is further optimized, specifically, as follows: Figure 5 - Figure 7 As shown, the fixing mechanism 28 includes a third slider 37. A third slot 27 is provided at both ends of the upper end of the fixing frame 24 and at positions corresponding to the third slider 37. The third slider 37 is located inside the third slot 27 and slidably connected to it. A rotating handle 30 is provided at the upper end of the third slider 37. A second screw 20 is fixedly connected to the middle of the lower end of the rotating handle 30. The lower end of the second screw 20 passes through the third slider 37 and extends to the outer side of the lower end of the fixing frame 24, where a bearing 36 is fixedly connected. A clamping pad 34 is fixedly connected to the lower end of the bearing 36. A second slider 35 is fixedly connected to the side of the clamping pad 34 near the bearing 36. A second groove 33 is provided at positions corresponding to the bearing 36 and the second slider 35. The second slider 35 is slidably connected to the second groove 33.

[0047] Through the above structural design, it can be seen that when the clamping plate 26 is pressed and moved by the plate, the clamping plate 26 can drive the second screw 20 to move through the connection between the second sliding groove 33 and the second slider 35. Then, the second screw 20 moves inside the third slot 27 through the third slider 37. After the clamping plate 26 clamps the plate, the rotating handle 30 can be rotated, and the rotating handle 30 drives the second screw 20 to rotate on the bearing 36. When the second screw 20 rotates, the second screw 20 moves downward on the third slider 37. Then, the second screw 20 pushes the clamping pad 34 downward through the bearing 36. Thus, the upper end of the plate can be clamped by the clamping pad 34 according to the thickness of the plate, preventing movement after cutting.

Claims

1. A sheet metal cutting device, characterized in that, The system includes an operating table (1), with support columns (2) fixedly connected to the four corners of the lower end of the operating table (1). A first slot (3) is opened in the middle of the upper end of the operating table (1), penetrating the bottom of the operating table (1). A transmission mechanism (4) is installed inside the first slot (3). Clamping mechanisms (11) are installed at both ends of the upper end of the operating table (1) and on the transmission mechanism (4). The two clamping mechanisms (11) are symmetrically arranged. Fixed columns (5) are fixedly connected to both sides of both ends of the operating table (1). A fixed seat (6) is installed between the upper ends of the two fixed columns (5) at the same end. The two ends of the lower end of the fixed seat (6) are respectively connected to the two fixed columns (5). A guide rod (7) is provided on one side between the two fixed seats (6). The two ends of the guide rod (7) are fixedly connected to the fixed seats (6) at both ends respectively. A reciprocating screw (8) is provided on the other side between the two fixed seats (6). The two ends of the reciprocating screw (8) are rotatably connected to the fixed seats (6) at both ends respectively. A first motor (9) is provided at one end of the reciprocating screw (8). The first motor (9) is fixed on the outside of the fixed seat (6) away from the reciprocating screw (8) and corresponds to the reciprocating screw (8). The output end of the first motor (9) passes through the fixed seat (6) and is fixedly connected to the reciprocating screw (8). A cutting device (10) is provided between the reciprocating screw (8) and the guide rod (7).

2. The plate cutting device according to claim 1, characterized in that, The cutting device (10) includes a connecting seat (12), one end of which is slidably connected to the guide rod (7), and the other end of which is threadedly connected to the reciprocating lead screw (8). A second slot (13) is provided in the middle of the connecting seat (12), and a moving mechanism (14) is provided inside the second slot (13). A first slide (15) is slidably connected inside the second slot (13), and the first slide (15) is connected to the moving mechanism (14). A telescopic rod (16) is fixedly connected to the middle of the lower end of the first slide (15), and a cutting machine (17) is fixedly connected to the telescopic end of the lower end of the telescopic rod (16).

3. The plate cutting device according to claim 2, characterized in that, The transmission mechanism (4) includes a connecting plate (18), which is located in the middle of the first slot (3). Both sides of the connecting plate (18) are fixedly connected to a first screw (19). The end of the first screw (19) away from the connecting plate (18) is rotatably connected to both ends inside the first slot (3). A second motor (21) is provided at the end of one of the first screws (19) away from the connecting plate (18). The second motor (21) is fixed on the outside of the operating table (1) and corresponds to the position of the first screw (19). The output end of the second motor (21) is fixedly connected to a connecting rod (22). The end of the connecting rod (22) away from the second motor (21) passes through the operating table (1) and is fixedly connected to the first screw (19).

4. The plate cutting device according to claim 3, characterized in that, The clamping mechanism (11) includes a second slide (25). The two second slides (25) are threadedly connected to the two first screws (19) on both sides of the connecting plate (18) inside the first slot (3). The second slides (25) are slidably connected to the first slot (3). The upper end of the second slide (25) is fixedly connected to a base (23). The lower end of the base (23) is slidably connected to the operating table (1). The ends of the two bases (23) that are close to each other are inclined. The ends of the two bases (23) that are far apart from each other are fixedly connected to a fixing frame (24). A clamping plate (26) is provided at the upper end of the base (23) and at the lower end of the fixing frame (24).

5. A plate cutting device according to claim 4, characterized in that, The clamping plate (26) has a first slider (32) fixedly connected to both the upper and lower ends. The base (23), the fixing frame (24) and the first slider (32) are provided with a first groove (29) at the corresponding positions. The first slider (32) is slidably connected to the first groove (29). The clamping plate (26) is fixedly connected to both ends on the side near the fixing frame (24) with a spring (31). The side of the spring (31) away from the clamping plate (26) is fixedly connected to the fixing frame (24). The clamping plate (26) is provided with a fixing mechanism (28) on both ends on the side away from the fixing frame (24).

6. A plate cutting device according to claim 5, characterized in that, The fixing mechanism (28) includes a third slider (37). The upper ends of the fixing frame (24) are provided with third slots (27) at positions corresponding to the third slider (37). The third slider (37) is located inside the third slot (27) and is slidably connected to the third slot (27). The upper end of the third slider (37) is provided with a rotating handle (30). The middle part of the lower end of the rotating handle (30) is fixedly connected to a second screw (20). The lower end of the second screw (20) extends through the third slider (37) to the outer side of the lower end of the fixing frame (24) and is fixedly connected to a bearing (36). The lower end of the bearing (36) is fixedly connected to a clamping pad (34). The side of the clamping pad (34) near the bearing (36) is fixedly connected to a second slider (35). The bearing (36) and the second slider (35) are provided with second grooves (33) at positions corresponding to the second slider (35). The second slider (35) is slidably connected to the second groove (33).

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