A protective structure for pallet loading device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-14
- Publication Date
- 2026-08-11
AI Technical Summary
[0005]为了克服大多数托盘子板上料装置,往往较难根据板材实际尺寸灵活调节防护结构,且防护结构大部分直接抵接在子板上的板材的四周,上下料时较为不便,影响上料作业高效开展的问题,提出本实用新型
[0015]上料时,将板材放置于子板主体上,转动第一双向丝杆调节两组第一夹板间距,使第一夹板夹紧板材一侧,伸长液压杆调节第二连杆放置角度,带动第二连杆底端绕托盘座内侧一端转动,使第二连杆顶端沿升降板底端滑动,同时,带动第一连杆底端沿托盘座滑动,使第一连杆顶端绕升降板底端转动,从而垂向升高升降板,通过第一通槽使第二夹板贯穿子板主体,转动第二双向丝杆灵活调节两组第二夹板间距,使子板主体穿过第二通槽,带动第二夹板沿条形滑槽滑动,利用第二夹板夹紧板材另一侧,以解决大多数托盘子板上料装置,往往较难根据板材实际尺寸灵活调节防护结构,且防护结构抵接在子板上的板材的四周,上下料时较为不便的问题,增强装置实用价值。
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Figure CN224618317U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pallet loading technology, and in particular to a protective structure for a pallet loading device. Background Technology
[0002] During the conveying of the sheet material, it needs to be placed on the sub-board of the pallet. To ensure the stable conveying of the sheet material, a protective structure needs to be added to the sub-board to position the sheet material and ensure that subsequent processing operations can be carried out accurately and stably.
[0003] Most current pallet loading devices have relatively simple protective structures, making it difficult to flexibly adjust the protective structure according to the actual size of the pallet. In addition, the protective structure is attached to the perimeter of the pallet, which is inconvenient for loading and unloading and affects the efficiency of loading operations.
[0004] Therefore, in view of the fact that existing feeding devices are difficult to adjust flexibly according to the actual size of the board, a protective structure for the pallet feeding device can be designed. Through bidirectional adjustment, the board can be clamped and fixed on the sub-board according to the actual size of the board, which improves the flexibility of the protective structure and maintains the flatness of the sub-board in one direction during feeding, which facilitates the board feeding operation and effectively enhances the practical value of the device. Utility Model Content
[0005] In order to overcome the problems that most pallet loading devices often have difficulty in flexibly adjusting the protective structure according to the actual size of the board, and that the protective structure is mostly directly abutting against the perimeter of the board on the pallet, which is inconvenient for loading and unloading and affects the efficiency of loading operations, this utility model is proposed.
[0006] The technical solution of this utility model is as follows: a protective structure for a pallet loading device, comprising a pallet seat, a sub-plate body, a first bidirectional lead screw, a first clamping plate, a first connecting rod, a lifting plate, a second connecting rod, a hydraulic rod, a second bidirectional lead screw, a second clamping plate, a first through groove, a second through groove, and a strip-shaped sliding groove. The sub-plate body is arranged above the pallet seat. The first bidirectional lead screw is arranged inside the sub-plate body. The first clamping plate is arranged outside the first bidirectional lead screw. The first connecting rod is arranged inside the pallet seat. The lifting plate is arranged at the top of the first connecting rod. The second connecting rod is arranged inside the first connecting rod. The hydraulic rod is arranged above the pallet seat. The second bidirectional lead screw is arranged inside the lifting plate. The second clamping plate is arranged outside the second bidirectional lead screw. A first through groove is opened on one side of the sub-plate body. A second through groove is opened at the bottom of the second clamping plate. A strip-shaped sliding groove is opened on one side of the sub-plate body.
[0007] Preferably, by setting a tray seat to fix the position of the sub-plate body, the plate is placed on the sub-plate body. The first bidirectional screw is rotated to adjust the distance between the two sets of first clamping plates, so that the first clamping plates clamp one side of the plate. The extension and retraction hydraulic rod adjusts the placement angle of the second connecting rod, thereby driving the bottom end of the second connecting rod to rotate around one end of the inner side of the tray seat, so that the top end of the second connecting rod slides along the bottom end of the lifting plate. At the same time, it drives the bottom end of the first connecting rod to slide along the tray seat, so that the top end of the first connecting rod rotates around the bottom end of the lifting plate, thereby vertically adjusting the placement height of the lifting plate. The second clamping plate passes through the sub-plate body through the first through slot. The second bidirectional screw is rotated to flexibly adjust the distance between the two sets of second clamping plates, so that the sub-plate body passes through the second through slot, driving the second clamping plate to slide along the strip groove. The second clamping plate clamps the other side of the plate, thereby achieving the clamping and fixing of the plate on the sub-plate according to the actual size of the plate. This improves the flexibility of the protective structure and maintains the flatness of the sub-plate in one direction during loading, which facilitates the loading operation of the plate and enhances the practical value of the device.
[0008] Preferably, the first bidirectional lead screw is rotatably connected to the main body of the sub-plate, two sets of first clamping plates are symmetrically arranged, the bottom end of the first clamping plate is rotatably connected to the first bidirectional lead screw by threads, two sets of first connecting rods are symmetrically arranged, the lifting plate is located below the main body of the sub-plate, the hydraulic rod is located between the two sets of second connecting rods, the second bidirectional lead screw is rotatably connected to the lifting plate, two sets of second clamping plates are symmetrically arranged, the second clamping plates are rotatably connected to the second bidirectional lead screw by threads, two sets of first through slots are symmetrically opened, the second clamping plates are slidably connected to the first through slots, the second through slots are slidably connected to both ends of the sub-plate main body, the strip groove is connected through the first through slot, and the bottom end of the second clamping plate is slidably connected to the strip groove.
[0009] Preferably, the top four corners of the tray base are provided with multiple sets of support rods, the sub-plate body is located at the top of the support rods, the outside of the tray base is provided with a control panel, the hydraulic rod is electrically connected to the control panel, the outside of the sub-plate body is provided with a first servo motor, the first servo motor is electrically connected to the control panel, and the output end of the first servo motor is connected to a first bidirectional lead screw.
[0010] Preferably, the inner side of the tray seat is symmetrically provided with two sets of T-shaped grooves, the bottom end of the first connecting rod is provided with a T-shaped slider, the T-shaped slider and the T-shaped groove are fitted and slidably connected, the bottom end of the lifting plate is symmetrically provided with two sets of first grooves, and the top end of the first connecting rod is rotatably connected with the first groove.
[0011] Preferably, two sets of second fixed frames are symmetrically arranged on one side of the inner side of the tray base. The bottom end of the second connecting rod is rotatably connected to the shaft of the second fixed frame. Two sets of I-shaped sliding grooves are symmetrically opened at the bottom end of the lifting plate. An I-shaped slider is rotatably connected to the top end of the second connecting rod. The I-shaped slider and the I-shaped sliding groove are fitted and slidably connected. A connecting shaft is provided in the middle of the two sets of second connecting rods.
[0012] Preferably, a first fixing frame is provided at one end of the inner side of the tray base, a fixing block is rotatably connected to the outer side of the first fixing frame, the outer fixing end of the hydraulic rod is provided on one side of the fixing block, and a connecting block is provided at the outer telescopic end of the hydraulic rod, and the connecting block is rotatably connected to the connecting shaft.
[0013] Preferably, a second servo motor is provided at one end of the outer side of the lifting plate. The second servo motor is electrically connected to the control panel. The output end of the second servo motor is connected to the second bidirectional lead screw. Two sets of guide rods are symmetrically arranged on the inner side of the lifting plate. The guide rods are symmetrically arranged on both sides of the second bidirectional lead screw. The bottom end of the second clamping plate is slidably connected to the guide rods.
[0014] The beneficial effects of this utility model are:
[0015] During loading, the sheet material is placed on the sub-plate body. The first bidirectional screw is rotated to adjust the distance between the two sets of first clamping plates, so that the first clamping plates clamp one side of the sheet material. The hydraulic rod is extended to adjust the placement angle of the second connecting rod, causing the bottom end of the second connecting rod to rotate around one end of the inner side of the pallet seat, so that the top end of the second connecting rod slides along the bottom end of the lifting plate. At the same time, the bottom end of the first connecting rod slides along the pallet seat, so that the top end of the first connecting rod rotates around the bottom end of the lifting plate, thereby vertically raising the lifting plate. The second clamping plate passes through the sub-plate body through the first through slot. The second bidirectional screw is rotated to flexibly adjust the distance between the two sets of second clamping plates, so that the sub-plate body passes through the second through slot, causing the second clamping plate to slide along the strip groove. The second clamping plate clamps the other side of the sheet material. This solves the problem that most pallet sub-plate loading devices often have difficulty flexibly adjusting the protective structure according to the actual size of the sheet material, and the protective structure abuts against the four sides of the sheet material on the sub-plate, which is inconvenient for loading and unloading. This enhances the practical value of the device. Attached Figure Description
[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of a protective structure for a pallet loading device according to this utility model.
[0017] Figure 2 The diagram shown is a three-dimensional structural schematic of the lifting plate of the protective structure of the pallet loading device of this utility model.
[0018] Figure 3 The diagram shown is a three-dimensional structural schematic of the lifting plate receiving first through groove of the protective structure of the pallet loading device of this utility model.
[0019] Figure 4 The diagram shown is a three-dimensional cross-sectional view of a pallet seat with a protective structure for a pallet loading device according to this utility model.
[0020] Figure 5 The diagram shows a three-dimensional structural schematic of the pallet seat and lifting plate of the pallet loading device protective structure of this utility model.
[0021] Explanation of reference numerals in the attached drawings: 1. Tray base; 101. Support rod; 102. Control panel; 2. Subplate body; 3. First bidirectional lead screw; 301. First servo motor; 4. First clamping plate; 5. First connecting rod; 501. T-shaped slide groove; 502. T-shaped slider; 6. Lifting plate; 601. First groove; 7. Second connecting rod; 701. Second fixing frame; 702. I-shaped slide groove; 703. I-shaped slider; 704. Connecting shaft; 8. Hydraulic rod; 801. Fixing block; 802. First fixing frame; 803. Connecting block; 9. Second bidirectional lead screw; 901. Second servo motor; 10. Second clamping plate; 1001. Guide rod; 11. First through groove; 12. Second through groove; 13. Strip slide groove. Detailed Implementation
[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0023] Please see Figure 1 and Figure 2 This utility model provides an embodiment of a protective structure for a pallet loading device, comprising a pallet seat 1, a sub-plate body 2, a first bidirectional lead screw 3, a first clamping plate 4, a first connecting rod 5, a lifting plate 6, a second connecting rod 7, a hydraulic rod 8, a second bidirectional lead screw 9, a second clamping plate 10, a first through groove 11, a second through groove 12, and a strip-shaped slide groove 13. The sub-plate body 2 is positioned above the pallet seat 1. The first bidirectional lead screw 3 is rotatably connected to the sub-plate body 2 on its inner side. The first clamping plate 4 is symmetrically arranged in two sets on its outer side. The bottom end of the first clamping plate 4 is threadedly rotatably connected to the first bidirectional lead screw 3. The first connecting rod 5 is symmetrically arranged in two sets on its inner side. A lifting plate 6 is positioned at the top of the first connecting rod 5, and the lifting plate 6 is located below the sub-plate body 2. A second connecting rod 7 is provided on the inner side of rod 5. A hydraulic rod 8 is provided above the tray seat 1. The hydraulic rod 8 is located between the two sets of second connecting rods 7. A second bidirectional screw 9 is provided on the inner side of lifting plate 6. The second bidirectional screw 9 is rotatably connected to lifting plate 6. A second clamping plate 10 is provided on the outer side of the second bidirectional screw 9. Two sets of second clamping plates 10 are symmetrically arranged. The second clamping plates 10 are threadedly rotatably connected to the second bidirectional screw 9. A first through groove 11 is provided on one side of sub-plate body 2. Two sets of first through grooves 11 are symmetrically arranged. The second clamping plate 10 is fitted and slidably connected to the first through groove 11. A second through groove 12 is provided at the bottom end of the second clamping plate 10. The second through groove 12 is fitted and slidably connected to both ends of sub-plate body 2. A strip-shaped sliding groove 13 is provided on one side of sub-plate body 2. The strip-shaped sliding groove 13 is connected through to the first through groove 11. The bottom end of the second clamping plate 10 is fitted and slidably connected to the strip-shaped sliding groove 13.
[0024] Please see Figure 3In this embodiment, multiple sets of support rods 101 are provided at the four corners of the top of the tray base 1. The sub-plate body 2 is located at the top of the support rods 101. A control panel 102 is provided on the outside of the tray base 1. The hydraulic rod 8 is electrically connected to the control panel 102. A first servo motor 301 is provided on the outside of the sub-plate body 2. The first servo motor 301 is electrically connected to the control panel 102. The output end of the first servo motor 301 is connected to the first bidirectional lead screw 3. The sub-plate body 2 is supported and fixed by the support rods 101 and fixed on the tray base 1. The control panel 102 sends extension and retraction commands to the hydraulic rod 8 and sends running commands to the first servo motor 301. The first servo motor 301 drives the first bidirectional lead screw 3 to rotate. Rotating the first bidirectional lead screw 3 flexibly adjusts the distance between the two sets of first clamping plates 4.
[0025] Please see Figure 4 and Figure 5 In this embodiment, two sets of T-shaped grooves 501 are symmetrically provided on the inner side of the tray base 1. A T-shaped slider 502 is provided at the bottom end of the first connecting rod 5. The T-shaped slider 502 is fitted and slidably connected with the T-shaped groove 501. Two sets of first grooves 601 are symmetrically provided at the bottom end of the lifting plate 6. The top end of the first connecting rod 5 is rotatably connected with the first groove 601. When the hydraulic rod 8 extends and retracts, the placement angle of the first connecting rod 5 changes synchronously. The T-shaped slider 502 at the bottom end of the first connecting rod 5 slides along the T-shaped groove 501. At this time, the top end of the first connecting rod 5 rotates in the first groove 601, thereby flexibly adjusting the placement height of the lifting plate 6.
[0026] Two sets of second fixed frames 701 are symmetrically arranged on one end of the inner side of the tray base 1. The bottom end of the second connecting rod 7 is rotatably connected to the shaft of the second fixed frame 701. Two sets of I-shaped slide grooves 702 are symmetrically opened on the bottom end of the lifting plate 6. The top end of the second connecting rod 7 is rotatably connected to the I-shaped slider 703. The I-shaped slider 703 is fitted and slidably connected to the I-shaped slide groove 702. A connecting shaft 704 is provided in the middle of the two sets of second connecting rods 7. The bottom end of the second connecting rod 7 is rotatably connected to the second fixed frame 701 through the second fixed frame 701. When the hydraulic rod 8 extends and retracts, the bottom end of the second connecting rod 7 rotates around the second fixed frame 701. At the same time, the I-shaped slider 703 at the top end of the second connecting rod 7 slides synchronously along the I-shaped slide groove 702, thereby ensuring the stable lifting and lowering of the lifting plate 6. The two sets of second connecting rods 7 are connected and fixed by the connecting shaft 704.
[0027] Please see Figure 3 and Figure 4In this embodiment, a first fixing frame 802 is provided on one inner end of the tray base 1, and a fixing block 801 is rotatably connected to the outer side of the first fixing frame 802. The outer fixing end of the hydraulic rod 8 is provided on one side of the fixing block 801, and a connecting block 803 is provided on the outer telescopic end of the hydraulic rod 8. The connecting block 803 is rotatably connected to the connecting shaft 704. The fixing block 801 is rotatably connected to the first fixing frame 802, and the fixing block 801 is used to fix one end of the hydraulic rod 8. When the hydraulic rod 8 is telescopic, the connecting block 803 rotates around the connecting shaft 704, thereby flexibly adjusting the placement angle of the second connecting rod 7.
[0028] A second servo motor 901 is provided at one end of the outer side of the lifting plate 6. The second servo motor 901 is electrically connected to the control panel 102. The output end of the second servo motor 901 is connected to the second bidirectional lead screw 9. Two sets of guide rods 1001 are symmetrically arranged on the inner side of the lifting plate 6. The guide rods 1001 are symmetrically arranged on both sides of the second bidirectional lead screw 9. The bottom end of the second clamping plate 10 is slidably connected to the guide rods 1001. The control panel 102 sends a running command to the second servo motor 901, which drives the second bidirectional lead screw 9 to rotate. Rotating the second bidirectional lead screw 9 flexibly adjusts the distance between the two sets of second clamping plates 10, so that the bottom end of the second clamping plate 10 slides synchronously along the guide rods 1001, thereby making the second clamping plate 10 stably clamp the other side of the plate.
[0029] During loading, the sub-board body 2 is supported and fixed on the pallet seat 1 by the support rod 101, the board is placed on the sub-board body 2, and the operation command is sent to the first servo motor 301 through the control panel 102. The first bidirectional screw 3 is rotated to adjust the distance between the two sets of first clamping plates 4 so that the first clamping plates 4 clamp one side of the board.
[0030] Subsequently, the control panel 102 sends an extension command to the hydraulic rod 8, causing the fixed block 801 to rotate around the first fixed frame 802 and the connecting block 803 to rotate synchronously around the connecting shaft 704, thereby pushing the connecting shaft 704 to adjust the placement angle of the first connecting rod 5 and the second connecting rod 7.
[0031] At the same time, the bottom end of the second connecting rod 7 rotates around the second fixed frame 701, and the I-shaped slider 703 at the top of the second connecting rod 7 slides along the I-shaped slide groove 702, causing the top end of the first connecting rod 5 to rotate in the first groove 601, so that the T-shaped slider 502 at the bottom of the first connecting rod 5 slides along the T-shaped slide groove 501, thereby vertically raising the lifting plate 6 to the highest position. At this time, the second clamping plate 10 passes through the first through groove 11.
[0032] Finally, the control panel 102 sends a running command to the second servo motor 901, rotates the second bidirectional lead screw 9 to flexibly adjust the distance between the two sets of second clamping plates 10, drives the second clamping plates 10 to slide along the guide rod 1001, so that the sub-plate body 2 passes through the second through groove 12, drives the second clamping plates 10 to slide along the strip slide groove 13, and uses the second clamping plates 10 to clamp the other side of the plate.
[0033] During material unloading, the second clamping plate 10 is moved to both ends of the second bidirectional screw 9, the hydraulic rod 8 is retracted to lower the height of the lifting plate 6, so that the second clamping plate 10 descends along the first through groove 11. After the top of the second clamping plate 10 is flush with the sub-plate body 2, the distance between the first clamping plates 4 is increased to facilitate material unloading.
[0034] Through the above steps, by setting the position of the sub-plate body 2 by the tray seat 1, the plate is placed on the sub-plate body 2. The first bidirectional screw 3 is rotated to adjust the distance between the two sets of first clamping plates 4, so that the first clamping plates 4 clamp one side of the plate. The telescopic hydraulic rod 8 adjusts the placement angle of the second connecting rod 7, thereby driving the bottom end of the second connecting rod 7 to rotate around one end of the inner side of the tray seat 1, so that the top end of the second connecting rod 7 slides along the bottom end of the lifting plate 6. At the same time, it drives the bottom end of the first connecting rod 5 to slide along the tray seat 1, so that the top end of the first connecting rod 5 rotates around the bottom end of the lifting plate 6. The vertical adjustment lifting plate 6 is positioned at a height that allows the second clamping plate 10 to pass through the sub-plate body 2 via the first through slot 11. The second bidirectional screw 9 is rotated to flexibly adjust the distance between the two sets of second clamping plates 10, allowing the sub-plate body 2 to pass through the second through slot 12 and drive the second clamping plate 10 to slide along the strip slide 13. The second clamping plate 10 is used to clamp the other side of the plate, thereby clamping and fixing the plate to the sub-plate according to its actual size, improving the flexibility of the protective structure and maintaining the flatness of the sub-plate in one direction during loading, which facilitates the loading operation of the plate.
[0035] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.
Claims
1. A tray sub-plate feeding device protection structure, comprising a tray seat (1) and a sub-plate main body (2), characterized in that: It also includes a first bidirectional lead screw (3), a first clamping plate (4), a first connecting rod (5), a lifting plate (6), a second connecting rod (7), a hydraulic rod (8), a second bidirectional lead screw (9), a second clamping plate (10), a first through groove (11), a second through groove (12), and a strip groove (13). A sub-plate body (2) is provided above the pallet seat (1). The first bidirectional lead screw (3) is provided on the inner side of the sub-plate body (2). The first clamping plate (4) is provided on the outer side of the first bidirectional lead screw (3). The first clamping plate (4) is provided on the inner side of the pallet seat (1). The first connecting rod (5) has a lifting plate (6) at its top and a second connecting rod (7) on its inner side. A hydraulic rod (8) is provided above the tray seat (1). A second double-acting screw (9) is provided on the inner side of the lifting plate (6). A second clamping plate (10) is provided on the outer side of the second double-acting screw (9). A first through groove (11) is provided on one side of the sub-plate body (2). A second through groove (12) is provided at the bottom of the second clamping plate (10). A strip groove (13) is provided on one side of the sub-plate body (2).
2. The protective structure for a pallet loading device according to claim 1, characterized in that: The first bidirectional screw (3) is rotatably connected to the sub-plate body (2). Two sets of first clamping plates (4) are symmetrically arranged. The bottom end of the first clamping plate (4) is rotatably connected to the first bidirectional screw (3) by a thread. Two sets of first connecting rods (5) are symmetrically arranged. The lifting plate (6) is located below the sub-plate body (2). The hydraulic rod (8) is located between the two sets of second connecting rods (7). The second bidirectional screw (9) is rotatably connected to the lifting plate (6). Two sets of second clamping plates (10) are symmetrically arranged. The second clamping plate (10) is rotatably connected to the second bidirectional screw (9) by a thread. Two sets of first through grooves (11) are symmetrically opened. The second clamping plate (10) is slidably connected to the first through groove (11). The second through groove (12) is slidably connected to both ends of the sub-plate body (2). The strip groove (13) is connected through to the first through groove (11). The bottom end of the second clamping plate (10) is slidably connected to the strip groove (13).
3. The protective structure for a pallet loading device according to claim 1, characterized in that: The top four corners of the tray base (1) are provided with multiple sets of support rods (101), the sub-plate body (2) is located at the top of the support rods (101), the outside of the tray base (1) is provided with a control panel (102), the hydraulic rod (8) is electrically connected to the control panel (102), the outside of the sub-plate body (2) is provided with a first servo motor (301), the first servo motor (301) is electrically connected to the control panel (102), and the output end of the first servo motor (301) is connected to the first bidirectional lead screw (3).
4. The protective structure for a pallet loading device according to claim 1, characterized in that: Two sets of T-shaped grooves (501) are symmetrically opened on the inner side of the tray seat (1). A T-shaped slider (502) is provided at the bottom end of the first connecting rod (5). The T-shaped slider (502) and the T-shaped groove (501) are fitted and slidably connected. Two sets of first grooves (601) are symmetrically opened at the bottom end of the lifting plate (6). The top end of the first connecting rod (5) is rotatably connected to the first groove (601).
5. The protective structure for a pallet loading device according to claim 1, characterized in that: Two sets of second fixed frames (701) are symmetrically arranged on one side of the inner side of the tray base (1). The bottom end of the second connecting rod (7) is rotatably connected to the shaft of the second fixed frame (701). Two sets of I-shaped slide grooves (702) are symmetrically opened on the bottom end of the lifting plate (6). An I-shaped slider (703) is rotatably connected to the top end of the second connecting rod (7). The I-shaped slider (703) and the I-shaped slide groove (702) are fitted and slidably connected. A connecting shaft (704) is provided in the middle of the two sets of second connecting rods (7).
6. The protective structure for a pallet loading device according to claim 5, characterized in that: A first fixing frame (802) is provided on one end of the inner side of the tray seat (1). A fixing block (801) is rotatably connected to the outer side of the first fixing frame (802). The outer fixing end of the hydraulic rod (8) is located on one side of the fixing block (801). A connecting block (803) is provided on the outer telescopic end of the hydraulic rod (8). The connecting block (803) is rotatably connected to the connecting shaft (704).
7. The protective structure for a pallet loading device according to claim 3, characterized in that: A second servo motor (901) is provided at one end of the outer side of the lifting plate (6). The second servo motor (901) is electrically connected to the control panel (102). The output end of the second servo motor (901) is connected to the second bidirectional lead screw (9). Two sets of guide rods (1001) are symmetrically arranged on the inner side of the lifting plate (6). The guide rods (1001) are symmetrically arranged on both sides of the second bidirectional lead screw (9). The bottom end of the second clamping plate (10) is slidably connected to the guide rods (1001).