Copper foil automatic shaft installation sleeve plugging and unplugging device
By designing the copper foil automatic shaft mounting plug-in and unplugging equipment, the synchronous moving mechanism and drive mechanism are used to achieve automatic plug-in and unplugging and fixing, the problem of manual operation in the prior art is solved, and the working efficiency and safety are improved.
Patent Information
- Application Number
- CN202411099710.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-05-09
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The installation sleeve and automatic shaft insertion and removal of existing copper foil rolls require manual operation, which is time-consuming and labor-intensive, and the connection is not stable enough, which may cause the copper foil roll to fall and damage, which is dangerous.
A copper foil automatic shaft mounting sleeve and pulling equipment is designed, using a synchronous moving mechanism and a driving mechanism. Through components such as front and back motors, screws, telescopic sleeves, racks and clamps, automatic insertion and fixing of the mounting sleeves and automatic shafts is realized.
Automatic insertion and unplugging between the mounting sleeve and the automatic shaft is realized, saving time and effort, and improving work efficiency. At the same time, through the clamping effect of the clamping parts, the stability of the connection is enhanced, and the copper foil roll is avoided falling and damaged during the lifting process, which improves safety.
Smart Images

Figure CN119965638A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of copper foil, and in particular to a copper foil automatic shaft installation sleeve plugging and unplugging device. Background Art
[0002] Copper foil is a thin sheet material made of pure copper. It has excellent electrical conductivity, good thermal conductivity, flexibility and processability, electromagnetic shielding performance, corrosion resistance and other properties. Copper foil is widely used in the fields of electronics industry, communication equipment, electromagnetic shielding materials, architectural decoration and art crafts. Copper foil is generally rolled into a copper foil roll. There is an automatic shaft in the middle of the copper foil roll. When the copper foil roll is moved and transported, the installation sleeves are usually put on both ends of the automatic shaft, and then the hoisting machine is used to hook the two installation sleeves to start hoisting.
[0003] However, the existing plugging and unplugging operations between the installation sleeve and the automatic shaft require manual operation, which is time-consuming, labor-intensive, and inefficient. In addition, the installation sleeve is only inserted into the outside of the automatic shaft, and the connection between the two is not stable enough, which may cause the copper foil roll to fall and be damaged during the lifting process, and it is also dangerous. Summary of the invention
[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a copper foil automatic shaft installation sleeve plugging and pulling device.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions:
[0006] A copper foil automatic shaft installation sleeve plugging and unplugging device comprises: an installation box, installation sleeves are arranged on both sides of the bottom of the installation box, a moving plate is vertically arranged inside the installation sleeve, springs are horizontally welded at both ends of the inner side of the moving plate, and the other ends of the two springs are welded to the inner wall of the installation sleeve;
[0007] A synchronous movement mechanism, the synchronous movement mechanism is used to drive the two installation sleeves to move synchronously;
[0008] A clamping piece, wherein two clamping pieces are provided and are respectively located at the top and the bottom of one side of the interior of the installation sleeve;
[0009] The driving mechanism is used for moving the moving plate to drive the two clamping members to move.
[0010] As a further technical solution of the present invention, an equipment box is welded to the top of the installation box, a lifting ring is welded to the top of the equipment box, a side door is hinged on one side of the equipment box, a battery is fixedly installed inside the equipment box, a heat dissipation port is opened on one side of the outside of the equipment box, and a plurality of heat dissipation ports are provided and are evenly distributed on one side of the outside of the equipment box.
[0011] As a further technical solution of the present invention, the synchronous moving mechanism includes a forward and reverse motor and a screw rod, the screw rod is horizontally rotatably connected to the inside of the installation box, both ends of the screw rod are sleeved with a first moving block, and the two first moving blocks are connected to the screw rod by threads, the thread directions at both ends of the screw rod are opposite, and the two first moving blocks are slidably connected to the inside of the installation box, the forward and reverse motor is horizontally fixedly installed on one end outside the installation box, the output shaft of the forward and reverse motor extends into the interior of the installation box and is rotatably connected to the installation box, and the output shaft of the forward and reverse motor is fixedly connected to one end of the screw rod.
[0012] Starting the forward and reverse motors drives the screw rod to rotate, which drives the two first moving blocks to move synchronously on the screw rod. The two first moving blocks drive the two mounting sleeves to move synchronously through the telescopic sleeve rod, so that the two mounting sleeves are respectively inserted at the two ends of the automatic shaft; when the automatic shaft and the mounting sleeve need to be disassembled, the screw rod is driven to rotate in the opposite direction, which drives the two mounting sleeves to move in the opposite direction. The plugging and unplugging operations between the mounting sleeves and the automatic shaft do not require manual operation, which saves time and effort and improves work efficiency.
[0013] As a further technical solution of the present invention, telescopic sleeve rods are vertically welded on both sides of the bottom of the first moving block, and a locking bolt is screwed on one side of one of the telescopic sleeve rods, and the locking bolt is used to lock the length of the telescopic sleeve rod, and one of the mounting sleeves is horizontally welded to the bottom of the two telescopic sleeve rods, and the structures of the bottoms of the two first moving blocks are the same.
[0014] The locking bolt can be loosened, and the telescopic rod can be adjusted to a suitable length according to the radius of the aluminum foil roll to be hoisted, and then the locking bolt can be tightened to fix the length of the telescopic rod, so that aluminum foil rolls of different radii can be hoisted, with a wider range of adaptability.
[0015] As a further technical solution of the present invention, the driving mechanism includes a screw, a rack is horizontally welded on the inner side of the movable plate, the rack passes through the mounting sleeve and is slidably connected to the mounting sleeve, a support block is welded on one side of the outer side of the mounting sleeve, the screw vertically passes through the support block and is rotatably connected to the support block, a gear is welded in the middle of the screw, the gear and the rack are meshed, both ends of the screw are sleeved with a second movable block, and the two second movable blocks are connected to the screw by threads, and the threads at both ends of the screw are in opposite directions, an L-shaped connecting rod is welded on one side of the two second movable blocks, and the other ends of the two L-shaped connecting rods respectively pass through the top and bottom of the mounting sleeve, the two L-shaped connecting rods are slidably connected to the mounting sleeve, and the other ends of the two L-shaped connecting rods are respectively welded to two clamps.
[0016] When the two installation sleeves are aligned with the automatic shaft of the aluminum foil roll and inserted, the automatic shaft squeezes the moving plate to move it into the installation sleeve to squeeze the spring, and the moving plate drives the rack to move. Because the rack and the gear are meshed, the gear is driven to rotate, and the gear drives the screw to rotate, driving the two second moving blocks to move toward each other on the screw. The two second moving blocks drive the two clamping pieces to move toward each other through the L-shaped connecting rod. When the installation sleeve is completely inserted into the outside of the automatic shaft, the two clamping pieces are just clamped on the outside of the automatic shaft, thereby fixing the automatic shaft and the installation sleeve together, making the connection between the two more stable, avoiding the copper foil roll from falling and being damaged during the hoisting process, and being safer; when the automatic shaft and the installation sleeve need to be disassembled, the synchronous moving mechanism is used to drive the two installation sleeves to move in opposite directions, and the moving plate returns to its original position under the elastic force of the spring, thereby driving the two clamping pieces to loosen in the same way. The fixing and loosening between the automatic shaft and the installation sleeve use the plugging and unplugging between the automatic shaft and the installation sleeve as the driving force, without the need for additional driving equipment, reducing equipment costs, and the fixing and loosening between the automatic shaft and the installation sleeve are completed at the same time as the plugging and unplugging of the automatic shaft and the installation sleeve, and the linkage is stronger.
[0017] As a further technical solution of the present invention, the movable plate is connected to the inside of the mounting sleeve in a transverse sliding manner, limiting plates are welded at both ends of the screw, the internal and external structures of the two mounting sleeves are the same, and the two mounting sleeves are symmetrically arranged.
[0018] The beneficial effects of the present invention are as follows: the plugging and unplugging operations between the installation sleeve and the automatic shaft do not require manual operation, which saves time and effort and improves work efficiency; the installation sleeve and the automatic shaft are automatically fixed when they are plugged in, and the connection between the two is more stable, which prevents the copper foil roll from falling and being damaged during the lifting process and is safer; the fixing and loosening between the automatic shaft and the installation sleeve utilize the plugging and unplugging between the automatic shaft and the installation sleeve as a driving force, and no additional driving equipment is required, which reduces equipment costs, and the fixing and loosening between the automatic shaft and the installation sleeve are completed at the same time as the plugging and unplugging of the automatic shaft and the installation sleeve, and the linkage is stronger. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic diagram of the structure of a copper foil automatic shaft installation sleeve plugging and unplugging device proposed by the present invention;
[0020] Figure 2 This is a partial cross-sectional structural schematic diagram of a copper foil automatic shaft installation sleeve plugging and unplugging device proposed by the present invention;
[0021] Figure 3 This is a schematic diagram of the bottom view of the structure of a copper foil automatic shaft installation sleeve plugging and unplugging device proposed by the present invention;
[0022] Figure 4 This is a front cross-sectional structural schematic diagram of a copper foil automatic shaft installation sleeve plugging and unplugging device proposed by the present invention;
[0023] Figure 5 This is a schematic diagram of the internal structure of an installation sleeve of a copper foil automatic shaft installation sleeve plugging and unplugging device proposed by the present invention.
[0024] In the figure: 1. heat dissipation port; 2. installation box; 3. forward and reverse motors; 4. locking bolt; 5. limit plate; 6. screw rod; 7. gear; 8. second moving block; 9. rack; 10. installation sleeve; 11. L-shaped connecting rod; 12. telescopic sleeve rod; 13. clamping piece; 14. moving plate; 15. side door; 16. equipment box; 17. lifting ring; 18. support block; 19. battery; 20. screw rod; 21. first moving block; 22. spring. DETAILED DESCRIPTION
[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.
[0026] Please refer to the attached Figure 1 -Attached Figure 5 A copper foil automatic shaft installation sleeve plugging and unplugging device comprises: an installation box 2, installation sleeves 10 are arranged on both sides of the bottom of the installation box 2, a moving plate 14 is vertically arranged inside the installation sleeve 10, springs 22 are horizontally welded at both ends of the inner side of the moving plate 14, and the other ends of the two springs 22 are welded to the inner wall of the installation sleeve 10;
[0027] A synchronous movement mechanism, which is used to drive the two mounting sleeves 10 to move synchronously;
[0028] A clamping member 13, wherein two clamping members 13 are provided and are respectively located at the top and the bottom of one side of the interior of the mounting sleeve 10;
[0029] The driving mechanism is used to move the moving plate 14 and drive the two clamping members 13 to move.
[0030] Please refer to the attached Figure 1 and 3 In a preferred embodiment, an equipment box 16 is welded on the top of the installation box 2, a lifting ring 17 is welded on the top of the equipment box 16, and a side door 15 is hinged on one side of the equipment box 16. The hook of the hoisting machine lifts the aluminum foil roll fixed under the entire device through the lifting ring 17, and the side door 15 can be opened to charge and repair the battery 19.
[0031] Please refer to the attached Figure 1 and 2 In a preferred embodiment, a battery 19 is fixedly installed inside the equipment box 16, and a heat dissipation port 1 is provided on one side of the outside of the equipment box 16. A plurality of heat dissipation ports 1 are provided and evenly distributed on one side of the outside of the equipment box 16. The battery 19 supplies power to the forward and reverse motors 3, and the plurality of heat dissipation ports 1 dissipate heat for the battery 19.
[0032] Please see attached Figure 1 and 3 In a preferred embodiment, the synchronous moving mechanism includes a forward and reverse motor 3 and a screw rod 20, the screw rod 20 is horizontally rotatably connected to the inside of the installation box 2, both ends of the screw rod 20 are sleeved with a first moving block 21, and the two first moving blocks 21 are connected to the screw rod 20 through threads.
[0033] Please see attached Figure 1 and 3 In a preferred embodiment, the thread directions at both ends of the screw rod 20 are opposite, and the two first moving blocks 21 are both slidably connected to the inside of the installation box 2, the forward and reverse motor 3 is horizontally fixedly installed at one end outside the installation box 2, the output shaft of the forward and reverse motor 3 extends into the interior of the installation box 2 and is rotatably connected to the installation box 2, and the output shaft of the forward and reverse motor 3 is fixedly connected to one end of the screw rod 20.
[0034] Starting the forward and reverse motor 3 drives the screw rod 20 to rotate, which drives the two first moving blocks 21 to move synchronously on the screw rod 20. The two first moving blocks 21 drive the two mounting sleeves 10 to move synchronously through the telescopic sleeve rod 12, so that the two mounting sleeves 10 are respectively inserted at the two ends of the automatic shaft; when the automatic shaft and the mounting sleeve 10 need to be disassembled, the screw rod 20 is driven to rotate in the opposite direction, which drives the two mounting sleeves 10 to move in the opposite direction. The plugging and unplugging operations between the mounting sleeves 10 and the automatic shaft do not require manual operation, which saves time and effort and improves work efficiency.
[0035] Please see attached Figure 1-4 In a preferred embodiment, telescopic sleeve rods 12 are vertically welded on both sides of the bottom of the first moving block 21, and a locking bolt 4 is screwed on one side of one of the telescopic sleeve rods 12, and the locking bolt 4 is used to lock the length of the telescopic sleeve rod 12, and one of the mounting sleeves 10 is horizontally welded to the bottom of the two telescopic sleeve rods 12, and the structures of the bottoms of the two first moving blocks 21 are the same.
[0036] The locking bolt 4 can be loosened, and the telescopic sleeve rod 12 can be adjusted to a suitable length according to the radius of the aluminum foil roll to be hoisted, and then the locking bolt 4 can be tightened to fix the length of the telescopic sleeve rod 12, so that aluminum foil rolls of different radii can be hoisted, with a wider range of adaptability.
[0037] Please see attached Figure 1-5 In a preferred embodiment, the driving mechanism includes a screw rod 6, a rack rod 9 is horizontally welded on the inner side of the movable plate 14, the rack rod 9 passes through the mounting sleeve 10 and is slidably connected to the mounting sleeve 10, a support block 18 is welded on one side of the outer side of the mounting sleeve 10, and the screw rod 6 vertically passes through the support block 18 and is rotatably connected to the support block 18.
[0038] Please see attached Figure 1-5In a preferred embodiment, a gear 7 is welded in the middle of the screw 6, the gear 7 is meshed with the rack 9, and the second moving blocks 8 are sleeved on both ends of the screw 6, and the two second moving blocks 8 are connected to the screw 6 through threads, and the threads at both ends of the screw 6 have opposite directions.
[0039] Please refer to the attached Figure 1-5 In a preferred embodiment, an L-shaped connecting rod 11 is welded on one side of the two second moving blocks 8, and the other ends of the two L-shaped connecting rods 11 respectively pass through the top and bottom of the mounting sleeve 10, the two L-shaped connecting rods 11 are slidingly connected to the mounting sleeve 10, and the other ends of the two L-shaped connecting rods 11 are respectively welded to the two clamping members 13.
[0040] When the two installation sleeves 10 are aligned with the automatic shaft of the aluminum foil roll and inserted, the automatic shaft squeezes the moving plate 14 to move it into the installation sleeve 10 to squeeze the spring 22, and the moving plate 14 drives the rack 9 to move. Because the rack 9 and the gear 7 are meshed, the gear 7 is driven to rotate, and the gear 7 drives the screw 6 to rotate, driving the two second moving blocks 8 to move toward each other on the screw 6. The two second moving blocks 8 drive the two clamping pieces 13 to move toward each other through the L-shaped connecting rod 11. When the installation sleeve 10 is completely inserted into the outside of the automatic shaft, the two clamping pieces 13 are just clamped on the outside of the automatic shaft, thereby fixing the automatic shaft and the installation sleeve 10 together, so that the two The connection between them is more stable, which prevents the copper foil roll from falling and being damaged during the lifting process, and is safer; when the automatic shaft and the mounting sleeve 10 need to be disassembled, the synchronous moving mechanism is used to drive the two mounting sleeves 10 to move in opposite directions, and the moving plate 14 returns to its original position under the elastic force of the spring 22, thereby driving the two clamping members 13 to loosen. The fixing and loosening between the automatic shaft and the mounting sleeve 10 utilize the plugging and unplugging between the automatic shaft and the mounting sleeve 10 as the driving force, and no additional driving equipment is required, thus reducing the equipment cost. Moreover, the fixing and loosening between the automatic shaft and the mounting sleeve 10 are completed at the same time as the plugging and unplugging of the automatic shaft and the mounting sleeve 10, and the linkage is stronger.
[0041] Please refer to the attached Figure 1-5 In a preferred embodiment, the moving plate 14 is slidably connected to the inside of the mounting sleeve 10 in the transverse direction, and the two ends of the screw rod 6 are welded with a limit plate 5, the internal and external structures of the two mounting sleeves 10 are the same, and the two mounting sleeves 10 are symmetrically arranged. The limit plate 5 prevents the second moving block 8 from detaching from the screw rod 6.
[0042] From the above description, it can be seen that the above embodiment of the present invention achieves the following technical effects: loosen the locking bolt 4, adjust the telescopic sleeve rod 12 to a suitable length according to the radius of the aluminum foil roll to be hoisted, and then tighten the locking bolt 4 to fix the length of the telescopic sleeve rod 12, so that aluminum foil rolls with different radii can be hoisted, and the adaptability range is wider;
[0043] Start the forward and reverse motor 3 to drive the screw rod 20 to rotate, which drives the two first moving blocks 21 to move synchronously on the screw rod 20. The two first moving blocks 21 drive the two mounting sleeves 10 to move synchronously through the telescopic sleeve rod 12, so that the two mounting sleeves 10 are respectively inserted at the two ends of the automatic shaft. When the two mounting sleeves 10 are aligned with the automatic shaft of the aluminum foil roll and inserted, the automatic shaft squeezes the moving plate 14 to move it into the mounting sleeve 10 to squeeze the spring 22. The moving plate 14 drives the rack 9 to move. Because the rack 9 and the gear 7 are meshed, the gear 7 is driven to rotate. The gear 7 drives the screw rod 6 to rotate, driving the two second moving blocks 8 to move toward each other on the screw rod 6. The two second moving blocks 8 drive the two clamping pieces 13 to move toward each other through the L-shaped connecting rod 11. When the mounting sleeve 10 is completely inserted into the outside of the automatic shaft, the two clamping pieces 13 are just clamped on the outside of the automatic shaft, thereby fixing the automatic shaft and the mounting sleeve 10 together, making the connection between the two more stable, preventing the copper foil roll from falling and being damaged during the hoisting process, and making it safer.
[0044] When it is necessary to disassemble the automatic shaft and the mounting sleeve 10, the screw rod 20 is driven to rotate in the opposite direction, which drives the two mounting sleeves 10 to move in the opposite direction, and the movable plate 14 returns to its original position under the elastic force of the spring 22, thereby driving the two clamping members 13 to loosen. The fixing and loosening between the automatic shaft and the mounting sleeve 10 utilize the plugging and unplugging between the automatic shaft and the mounting sleeve 10 as the driving force, and no additional driving equipment is required, thereby reducing equipment costs. Moreover, the fixing and loosening between the automatic shaft and the mounting sleeve 10 are completed at the same time when the plugging and unplugging is completed, and the linkage is stronger. The plugging and unplugging operations between the mounting sleeve 10 and the automatic shaft do not require manual operation, which saves time and effort and improves work efficiency.
[0045] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.
[0046] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A copper foil automatic shaft installation sleeve plugging and unplugging device, characterized in that: include: An installation box (2), wherein both sides of the bottom of the installation box (2) are provided with installation sleeves (10), a movable plate (14) is vertically provided inside the installation sleeve (10), springs (22) are horizontally welded at both ends of the inner side of the movable plate (14), and the other ends of the two springs (22) are welded to the inner wall of the installation sleeve (10); A synchronous movement mechanism, the synchronous movement mechanism is used to drive the two installation sleeves (10) to move synchronously; A clamping member (13), wherein two clamping members (13) are provided and are respectively located at the top and the bottom of one side inside the mounting sleeve (10); A driving mechanism is provided, wherein the driving mechanism is used to move the moving plate (14) and drive the two clamping members (13) to move.
2. The copper foil automatic shaft installation sleeve plugging and unplugging device according to claim 1 is characterized in that: An equipment box (16) is welded to the top of the installation box (2), a lifting ring (17) is welded to the top of the equipment box (16), and a side door (15) is hinged on one side of the equipment box (16).
3. The copper foil automatic shaft installation sleeve plugging and unplugging device according to claim 2 is characterized in that: A storage battery (19) is fixedly installed inside the equipment box (16), and a heat dissipation port (1) is provided on one side outside the equipment box (16). A plurality of heat dissipation ports (1) are provided and are evenly distributed on one side outside the equipment box (16).
4. The copper foil automatic shaft installation sleeve plugging and unplugging device according to claim 1, characterized in that: The synchronous movement mechanism comprises a forward and reverse motor (3) and a screw rod (20); the screw rod (20) is horizontally rotatably connected to the inside of the installation box (2); both ends of the screw rod (20) are sleeved with a first moving block (21), and the two first moving blocks (21) are connected to the screw rod (20) through threads.
5. The copper foil automatic shaft installation sleeve plugging and unplugging device according to claim 4, characterized in that: The threads at both ends of the screw rod (20) are in opposite directions, and the two first moving blocks (21) are both slidably connected to the inside of the installation box (2). The forward and reverse motor (3) is horizontally fixedly installed on one end outside the installation box (2). The output shaft of the forward and reverse motor (3) extends into the inside of the installation box (2) and is rotatably connected to the installation box (2). The output shaft of the forward and reverse motor (3) is fixedly connected to one end of the screw rod (20).
6. The copper foil automatic shaft installation sleeve plugging and unplugging device according to claim 5, characterized in that: Telescopic sleeve rods (12) are vertically welded on both sides of the bottom of the first moving block (21), and a locking bolt (4) is screwed on one side of one of the telescopic sleeve rods (12), and the locking bolt (4) is used to lock the length of the telescopic sleeve rod (12), and one of the mounting sleeves (10) is horizontally welded to the bottom of the two telescopic sleeve rods (12), and the structures of the bottoms of the two first moving blocks (21) are the same.
7. The copper foil automatic shaft installation sleeve plugging and unplugging device according to claim 1, characterized in that: The driving mechanism comprises a screw rod (6), a rack (9) is horizontally welded on the inner side of the movable plate (14), the rack (9) penetrates the mounting sleeve (10) and is slidably connected to the mounting sleeve (10), a support block (18) is welded on one side of the outer side of the mounting sleeve (10), and the screw rod (6) vertically penetrates the support block (18) and is rotatably connected to the support block (18).
8. The copper foil automatic shaft installation sleeve plugging and unplugging device according to claim 7, characterized in that: A gear (7) is welded in the middle of the screw rod (6), the gear (7) is meshed with a rack (9), and second moving blocks (8) are sleeved at both ends of the screw rod (6), and the two second moving blocks (8) are connected to the screw rod (6) through threads, and the threads at both ends of the screw rod (6) have opposite directions.
9. The copper foil automatic shaft installation sleeve plugging and unplugging device according to claim 8, characterized in that: An L-shaped connecting rod (11) is welded to one side of the two second moving blocks (8), and the other ends of the two L-shaped connecting rods (11) respectively penetrate the top and bottom of the mounting sleeve (10), the two L-shaped connecting rods (11) are slidably connected to the mounting sleeve (10), and the other ends of the two L-shaped connecting rods (11) are respectively welded to two clamping members (13).
10. The copper foil automatic shaft installation sleeve plugging and unplugging device according to claim 9, characterized in that: The movable plate (14) is connected to the inside of the installation sleeve (10) in a transverse sliding manner, and limiting plates (5) are welded to both ends of the screw rod (6). The internal and external structures of the two installation sleeves (10) are the same, and the two installation sleeves (10) are symmetrically arranged.