A non-impact adaptive type component capacity equipment positioning and changing system

Abstract

The present invention belongs to the technical field of battery production, and provides an impact-free adaptive capacity-forming equipment positioning and changing system, comprising a base, a support seat is slidably installed on the horizontal section of the base through a cross bar, and a first telescopic member that drives the support seat to move is fixedly installed on the base; a plurality of groups of spaced-apart partitions are fixedly installed on the vertical section of the base, and through grooves are provided on the partitions to solve the technical problem of inaccurate positioning of the battery cell caused by bottom wear during positioning of the battery cell body in the prior art. When the present invention is used, the battery is supported by support balls and support rollers respectively during positioning and movement, and is restricted from the side by a limiting roller, thereby achieving smooth movement of the battery and avoiding friction on the battery surface. The present invention can be widely used in operation scenarios for precise positioning of objects.

Description

Technical Field

[0001] The invention belongs to the technical field of battery production, and in particular relates to a non-impact adaptive type capacity composition equipment positioning and changing system. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. Due to the highly active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements.

[0003] During the production process of lithium batteries, the cells need to be chemically divided into capacities, and a chemically divided capacities cabinet is needed at this time. The chemically divided capacities cabinet needs to detect different types of cells during operation. When changing the cell model, the operator needs to manually replace them one by one, which is not convenient to use, and the operation is complicated and slow. In response to the above technical problems, the Chinese patent with patent announcement number CN220290970U is used to place the cell body into the inside of the placement slot, and turn the knob to make the threaded rod drive the connecting piece and the pressure plate to move. When the pressure plate and the cell body are against each other, the knob can be stopped. However, it is difficult to accurately place the cell in the placement slot at a suitable angle and position. When the cell body is tilted or not close to the edge, the pressure plate will push the cell body to move, thereby causing the cell body to rub against the bottom of the placement slot, which is easy to cause damage to the bottom surface of the cell body. The uneven bottom surface of the cell body is easy to cause inaccurate positioning of the cell. Summary of the invention

[0004] The purpose of the present invention is to provide an impact-free adaptive capacity-composition equipment positioning and changing system, aiming to solve the technical problem of inaccurate cell positioning caused by bottom wear during cell body positioning in the prior art.

[0005] The present invention is implemented as follows: a non-impact adaptive type component capacity equipment positioning and changing system comprises a base, a support seat is slidably mounted on the horizontal section of the base through a cross bar, and a first telescopic member driving the support seat to move is fixedly mounted on the base;

[0006] A plurality of spaced-apart partitions are fixedly mounted on the vertical section of the base, and a through groove is provided on the partition. A plurality of support rollers are rotatably mounted in the areas corresponding to the partitions on the support seat. A support plate is provided on the bottom surface of the support seat, and a plurality of support plates are fixedly mounted on the support plate. The support plates penetrate the support seat and are spaced-apart from the support rollers. A plurality of spaced-apart support balls are rotatably mounted on the surface of the support plate away from the support plate. A second telescopic member that drives the support plate to move upward is fixedly mounted on the base. A mounting plate is fixedly mounted on one side of the support seat close to the vertical section of the base, and a plurality of limiting rollers are rotatably mounted on the mounting plate. When the support seat drives the mounting plate to move, the limiting rollers pass through the through groove. A formation assembly is provided on the base, and a clamping assembly for clamping the battery is provided on the base.

[0007] Further technical solution: A limit plate with an L-shaped structure is fixedly installed on the surface of the support seat close to the horizontal section of the base, and the support plate contacts the limit plate when it is at the lowest height.

[0008] Further technical solution: A push plate is fixedly installed at the output end of the second telescopic member, and the push plates are distributed along the length direction of the support seat. When the push plates move upward, they contact with multiple groups of support plates at the same time and push the support plates to move upward.

[0009] Further technical solution: The formation assembly includes a top plate, which is arranged on the base and a plurality of sets of third telescopic parts for driving the top plate to rise and fall are fixedly installed on the upper surface of the vertical section of the base, a first slide is slidably installed on the surface of the top plate close to the base and a first threaded rod for driving the first slide to move is rotatably installed on the top plate, and a plurality of sets of staggered positive electrode terminals and negative electrode terminals are arranged on the first slide.

[0010] Further technical solution: two groups of second slides are slidably installed on the first slide, and two groups of second threaded rods are arranged on the first slide to drive the second slide to move, and the positive electrode terminal and the negative electrode terminal are respectively distributed on a group of second slides.

[0011] Further technical solution: The clamping assembly includes side panels, which are provided in multiple groups and fixedly installed on the base. The side panels and partitions are spaced apart, and pressure plates are slidably installed on the side panels. A first pressure plate is fixedly installed on one end of the pressure plate close to the vertical section of the base. Multiple groups of pressure plates are commonly fixedly connected to a mobile frame with a T-shaped structure, and a servo module for driving the mobile frame to move is provided on the base.

[0012] Further technical solution: a second pressing plate is rotatably installed on the first pressing plate, an arc-shaped fixing plate is fixedly installed on one end of the second pressing plate away from its rotation axis, the fixing plate passes through the first pressing plate and is in sliding contact with the first pressing plate, an electromagnet is fixedly installed on the side of the first pressing plate, the electromagnet is in sliding contact with the fixing plate, the fixing plate is made of magnetic material and the electromagnet adsorbs the fixing plate after being energized, an elastic wire is fixedly installed on the first pressing plate, the elastic wire is fixedly connected to the end of the fixing plate, a limit frame for limiting the position of the second pressing plate is fixedly installed on one end of the first pressing plate, and the elastic wire is in a stretched state when the second pressing plate is in contact with the limit frame.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The support seat is driven to move a set distance by the first telescopic member. When the side of the battery contacts the partition, the support seat is still moving. At this time, the support roller and the limit roller in contact with the battery will rotate, so as to keep the position of the battery unchanged. At this time, the batteries in other areas can continue to move under the drive of the support seat until the sides of all the batteries are in contact with the partition, thereby completing the positioning of the battery. During the positioning and moving process, the battery is supported by the support balls and the support rollers respectively, and is restricted from the side by the limit roller, so as to achieve smooth movement of the battery and avoid friction on the battery surface, avoid wear on the bottom of the battery, ensure the flatness of the bottom of the battery, and ensure the accuracy of battery positioning.

[0015] 2. The battery is positioned by positioning two adjacent sides of the battery in sequence. During the positioning process, the battery placement angle is automatically adjusted through the clamping assembly without manual adjustment, thereby avoiding the battery from tilting during placement and the problem of one or more groups of batteries being unable to complete battery positioning due to tilting and conflicting with the clamping components, thereby improving the accuracy of battery positioning.

[0016] 3. After completing the positioning of the battery, the mobile frame drives the second pressure plate to move toward one side of the battery again until the second pressure plate contacts the side of the battery away from the two groups of positioning sides. Since the second pressure plate and the first pressure plate are arranged at an angle, the force exerted by the second pressure plate on the battery can be decomposed into two groups of forces perpendicular to the two groups of positioning sides of the battery, thereby preventing the battery from being restricted by the force in a certain direction. If the battery deviates from the partition due to the rotation of the supporting roller at this time, the second pressure plate can be used to make the battery and the partition in close contact, thereby not only achieving the fixation of the battery, but also being able to detect and correct the position of the battery after positioning, thereby further improving the accuracy of battery positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the base in the present invention.

[0019] Figure 3 It is a structural schematic diagram of the top plate in the present invention.

[0020] Figure 4 It is a schematic cross-sectional structural diagram of the base in the present invention.

[0021] Figure 5 This is a schematic structural diagram of the support base in the present invention from a first viewing angle.

[0022] Figure 6 It is a schematic structural diagram of the support base from a second viewing angle in the present invention.

[0023] Figure 7 It is a schematic diagram of the structure of the clamping assembly in the present invention.

[0024] In the attached drawings: 1. base; 2. cross bar; 3. support seat; 4. support roller; 5. partition; 6. through groove; 7. mounting plate; 8. limiting roller; 9. support plate; 10. support plate; 11. supporting ball; 12. first telescopic member; 13. limiting plate; 14. second telescopic member; 15. push plate; 16. third telescopic member; 17. top plate; 18. first slide plate; 19. first threaded rod; 20. second slide plate; 21. second threaded rod; 22. positive terminal; 23. negative terminal; 24. moving frame; 25. servo module; 26. side plate; 27. pressure plate; 28. formation assembly; 29. ​​first pressing plate; 30. second pressing plate; 31. fixed plate; 32. electromagnet; 33. limiting frame; 34. elastic line; 35. clamping assembly. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0027] like Figure 1-Figure 7 As shown, a non-impact adaptive type component capacity equipment positioning and changing system provided by the present invention comprises a base 1, a support seat 3 is slidably mounted on the horizontal section of the base 1 through a cross bar 2, and a first telescopic member 12 that drives the support seat 3 to move is fixedly mounted on the base 1;

[0028] A plurality of spaced-apart partitions 5 are fixedly installed on the vertical section of the base 1, and a through groove 6 is provided on the partition 5. A plurality of support rollers 4 are rotatably installed in the area corresponding to the partition 5 on the support seat 3, and the rotation of the support rollers 4 is provided with a damper. A support plate 9 is provided on the bottom surface of the support seat 3, and a limit plate 13 of an L-shaped structure is fixedly installed on the surface of the support seat 3 close to the horizontal section of the base 1. When the support plate 9 is at the lowest height, it contacts the limit plate 13. A plurality of support plates 10 are fixedly installed on the support plate 9, and the support plate 10 passes through the support seat 3 and is spaced-apart from the support rollers 4. A plurality of spaced-apart support plates 10 are rotatably installed on the surface of the support plate 10 away from the support plate 9. A supporting ball 11 is fixedly installed on the base 1 with a second telescopic member 14 that drives the support plate 10 to move upward. A push plate 15 is fixedly installed on the output end of the second telescopic member 14. The push plates 15 are distributed along the length direction of the support seat 3. When the push plates 15 move upward, they contact with multiple groups of support plates 9 at the same time and push the support plates 9 to move upward. A mounting plate 7 is fixedly installed on one side of the support seat 3 close to the vertical section of the base 1. Multiple groups of limiting rollers 8 are rotatably installed on the mounting plate 7. When the support seat 3 drives the mounting plate 7 to move, the limiting rollers 8 pass through the through groove 6. A formation assembly 28 is arranged on the base 1, and a clamping assembly 35 for clamping the battery is arranged on the base 1.

[0029] After the battery is lifted up, the second retractable member 14 will move upward, and the push plate 15 will push the support ball 11 to move upward after contacting the support plate 9. After the support ball 11 contacts the bottom surface of the battery, the battery will move upward. After the bottom surface of the battery leaves the support roller 4, the second retractable member 14 will stop moving. At this time, the battery will be pushed to move toward the vertical section of the base 1 through the clamping assembly 35. If one side surface of the battery is not parallel to the partition 5, the clamping assembly 35 will contact one side of the battery. Then the clamping assembly 35 will push the battery to rotate until all sides of the battery are in contact with the clamping assembly 35. At this time, the side surface of the battery is parallel to the partition 5, thereby realizing the adjustment of the battery placement angle. When the side surface of the battery contacts the limiting roller 8, the positioning of one side of the battery is completed. At this time, the second retractable member 14 will shrink, and the support ball 11 will move downward so that the battery is supported by the support roller 4 again, and at the same time, the clamping assembly 35 will move away from the battery and no longer contact the battery.

[0030] Afterwards, the first telescopic member 12 is extended to drive the support seat 3 to move slowly horizontally. The movement of the support seat 3 drives the battery to move horizontally at the same time. Due to the different placement positions of the batteries, the distances from the battery side to the partition 5 are different, so the first telescopic member 12 drives the support seat 3 to move a set distance. When the side of the battery contacts the partition 5 and the support seat 3 is still moving, the support roller 4 and the limiting roller 8 in contact with the battery will rotate to keep the position of the battery unchanged. At this time, the batteries in other areas can continue to move driven by the support seat 3 until the sides of all the batteries contact the partition 5, thereby completing the positioning of the batteries, and then the pressing assembly is used again. 35 is used to compress and fix the battery, and the battery is positioned by positioning two adjacent sides of the battery in sequence. During the positioning and movement process, the battery is supported by the support ball 11 and the support roller 4 respectively, and is limited from the side by the limit roller 8, so that the battery can move smoothly and avoid friction on the battery surface, thereby ensuring the quality of the battery. During the positioning process, the pressing component 35 is used to automatically adjust the battery placement angle without manual adjustment, thereby avoiding tilting of the battery during placement, and avoiding the problem that one or more groups of batteries are tilted and conflict with the clamping components, resulting in the inability to complete the battery positioning, thereby improving the accuracy of battery positioning;

[0031] After the battery is positioned and fixed, the formation component 28 can be used to perform the formation and capacity operation. After the operation is completed, the clamping component 35 is released from fixing the battery, and then the support base 3 is reset, and the battery can be taken out.

[0032] In an example of the present embodiment, the first telescopic member 12 and the second telescopic member 14 are respectively the first electric telescopic rod and the second electric telescopic rod. Of course, they can also be other components such as hydraulic cylinders that can actively change the length. The first electric telescopic rod drives the support seat 3 to move, and the second electric telescopic rod drives the support ball 11 to move upward.

[0033] like Figure 1 , Figure 3 As shown, a non-impact adaptive chemical component capacity equipment positioning and changing system provided by the present invention is provided, and the chemical component 28 includes a top plate 17, the top plate 17 is arranged on the base 1, and a plurality of third telescopic members 16 for driving the top plate 17 to rise and fall are fixedly installed on the upper surface of the vertical section of the base 1, a first slide plate 18 is slidably installed on the surface of the top plate 17 close to the base 1, and a first threaded rod 19 for driving the first slide plate 18 to move is rotatably installed on the top plate 17, and a plurality of groups of staggered positive electrode terminals 22 and negative electrode terminals 23 are arranged on the first slide plate 18.

[0034] Specifically, two groups of second slide plates 20 are slidably mounted on the first slide plate 18 , and two groups of second threaded rods 21 for driving the second slide plates 20 to move are arranged on the first slide plate 18 , and the positive electrode terminal 22 and the negative electrode terminal 23 are respectively distributed on a group of second slide plates 20 .

[0035] In actual application of this embodiment, after the battery is placed and positioned, the first slide plate 18 is driven to move by the first threaded rod 19 according to the size of the battery and the position of the electrode column, so that the positive terminal post 22 and the negative terminal post 23 are located in the same vertical plane as the electrode column on the battery. Then, the position of the second slide plate 20 where the positive terminal post 22 is located is adjusted by the second threaded rod 21 according to the distance from the electrode column to the edge of the battery, so that the positive terminal post 22 is aligned with the positive electrode column on the battery. Then, the position of the second slide plate 20 where the negative terminal post 23 is located is adjusted according to the distance between the battery electrode columns, so that the negative terminal post 23 is aligned with the negative electrode column on the battery. At this time, the third telescopic member 16 drives the top plate 17 to move downward so that the positive terminal post 22 and the negative terminal post 23 are in contact and connected with the electrode column on the battery. At this time, the battery can be formed and divided. After the operation is completed, the third telescopic member 16 drives the top plate 17 to reset.

[0036] In an example of the present invention, the third telescopic member 16 is a third electric telescopic rod, and of course it can also be other components that can actively change the length, such as a hydraulic cylinder, and the top plate 17 is driven to move up and down by the third electric telescopic rod.

[0037] like Figure 1 , Figure 2 , Figure 4 , Figure 7 As shown, a non-impact adaptive type component capacity positioning and changing system provided by the present invention is provided, and the clamping assembly 35 includes a side plate 26, and the side plate 26 is provided with multiple groups and fixedly installed on the base 1, and the side plate 26 is spaced apart from the partition plate 5. A pressure plate 27 is slidably installed on the side plate 26, and a first pressure plate 29 is fixedly installed at one end of the pressure plate 27 close to the vertical section of the base 1. The multiple groups of pressure plates 27 are commonly fixedly connected to a T-shaped structured moving frame 24, and a servo module 25 for driving the moving frame 24 to move is provided on the base 1.

[0038] Specifically, a second pressing plate 30 is rotatably mounted on the first pressing plate 29, and an arc-shaped fixing plate 31 is fixedly mounted on one end of the second pressing plate 30 away from its rotation axis. The fixing plate 31 penetrates the first pressing plate 29 and is in sliding contact with the first pressing plate 29. An electromagnet 32 ​​is fixedly mounted on the side of the first pressing plate 29, and the electromagnet 32 ​​is in sliding contact with the fixing plate 31. The fixing plate 31 is made of magnetic material and the electromagnet 32 ​​adsorbs the fixing plate 31 after being energized. An elastic line 34 is fixedly mounted on the first pressing plate 29, and the elastic line 34 is fixedly connected to the end of the fixing plate 31. A limit frame 33 for limiting the position of the second pressing plate 30 is fixedly mounted on one end of the first pressing plate 29, and the elastic line 34 is in a stretched state when the second pressing plate 30 is in contact with the limit frame 33.

[0039] In actual application of this embodiment, in the initial state, the second pressure plate 30 is parallel to the first pressure plate 29 and the electromagnet 32 ​​is energized to fix the position of the second pressure plate 30. After the battery is placed on the support roller 4, the lower surface of the battery is supported by the support ball 11. At this time, the servo module 25 drives the mobile frame 24 to move in the direction of the support seat 3, so that the pressure plate 27 can drive the first pressure plate 29 and the second pressure plate 30 to approach the battery. After the second pressure plate 30 contacts the battery, if one side of the battery is not parallel to the partition 5, the second pressure plate 30 contacts one side of the battery, and then the second pressure plate 30 moves to push the battery to rotate Until all the sides of the battery are in contact with the second pressing plate 30, at this time the side of the battery is parallel to the partition 5, so as to adjust the battery placement angle. When one side surface of the battery is in contact with the limiting roller 8, the second pressing plate 30 and the limiting roller 8 can be used to position one side of the battery. At this time, the movable frame 24 moves in the opposite direction and the electromagnet 32 ​​is powered off. The second pressing plate 30 rotates away from the first pressing plate 29 under the action of the elastic line 34 until it contacts the limiting frame 33. When the second pressing plate 30 leaves the battery, the movable frame 24 stops moving, and at the same time the electromagnet 32 ​​is powered on to adsorb the fixing plate 31 to fix the position of the second pressing plate 30.

[0040] Subsequently, when the other side of the battery contacts the partition 5 to complete the positioning of the battery, the movable frame 24 drives the second pressure plate 30 to move toward one side of the battery until the second pressure plate 30 contacts the side of the battery away from the two groups of positioning sides. Since the second pressure plate 30 and the first pressure plate 29 are arranged at an angle, the force exerted by the second pressure plate 30 on the battery can be decomposed into two groups of forces perpendicular to the two groups of positioning sides of the battery, thereby preventing the battery from being restricted by the force in a certain direction. If the battery deviates from the partition 5 due to the rotation of the supporting roller 4 at this time, the second pressure plate 30 can be used to make the battery and the partition 5 in close contact, thereby not only achieving the fixation of the battery, but also being able to detect and correct the position of the battery after positioning, further improving the accuracy of battery positioning. After the capacity division operation is completed, the electromagnet 32 ​​is powered on, and at the same time, the movable frame 24 approaches the battery to make the second pressure plate 30 parallel to the first pressure plate 29 again, and then the electromagnet 32 ​​is powered on to fix the position of the second pressure plate 30.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A non-impact adaptive type component capacity equipment positioning and changing system, comprising a base (1), characterized in that: A support seat (3) is slidably mounted on the horizontal section of the base (1) via a crossbar (2), and a first telescopic member (12) is fixedly mounted on the base (1) for driving the support seat (3) to move; A plurality of groups of partitions (5) arranged at intervals are fixedly mounted on the vertical section of the base (1), and a through groove (6) is provided on the partition (5). A plurality of groups of support rollers (4) are rotatably mounted in the area corresponding to the partition (5) on the support seat (3). A support plate (9) is provided on the bottom surface of the support seat (3), and a plurality of groups of support plates (10) are fixedly mounted on the support plate (9). The support plates (10) penetrate the support seat (3) and are arranged at intervals from the support rollers (4). A plurality of groups of support plates (10) are rotatably mounted on the surface of the support plate (10) away from the support plate (9). The support ball (11) is fixedly mounted on the base (1) with a second telescopic member (14) for driving the support plate (10) to move upward; a mounting plate (7) is fixedly mounted on one side of the support seat (3) close to the vertical section of the base (1); a plurality of groups of limiting rollers (8) are rotatably mounted on the mounting plate (7); when the support seat (3) drives the mounting plate (7) to move, the limiting rollers (8) pass through the through grooves (6); a formation assembly (28) is arranged on the base (1); and a clamping assembly (35) for clamping the battery is arranged on the base (1).

2. According to claim 1, a non-impact adaptive type component capacity equipment positioning and changing system is characterized in that: A limiting plate (13) of an L-shaped structure is fixedly mounted on the surface of the support seat (3) close to the horizontal section of the base (1), and the support plate (9) is in contact with the limiting plate (13) when it is at the lowest height.

3. The impact-free adaptive type component capacity equipment positioning and changing system according to claim 2 is characterized in that: A push plate (15) is fixedly mounted on the output end of the second telescopic member (14). The push plates (15) are distributed along the length direction of the support seat (3). When the push plates (15) move upward, they simultaneously contact the plurality of support plates (9) and push the support plates (9) to move upward.

4. The impact-free adaptive type component capacity equipment positioning and changing system according to claim 1 is characterized in that: The formation assembly (28) comprises a top plate (17), the top plate (17) being arranged on the base (1) and having a plurality of sets of third telescopic members (16) fixedly mounted on the upper surface of the vertical section of the base (1) for driving the top plate (17) to move up and down, a first slide plate (18) being slidably mounted on the surface of the top plate (17) close to the base (1) and a first threaded rod (19) being rotatably mounted on the top plate (17) for driving the first slide plate (18) to move, and a plurality of sets of staggered positive electrode terminals (22) and negative electrode terminals (23) being arranged on the first slide plate (18).

5. The impact-free adaptive type component capacity equipment positioning and changing system according to claim 4 is characterized in that: Two groups of second slide plates (20) are slidably mounted on the first slide plate (18), and two groups of second threaded rods (21) are arranged on the first slide plate (18) for driving the second slide plates (20) to move, and the positive electrode terminal (22) and the negative electrode terminal (23) are respectively distributed on a group of second slide plates (20).

6. The impact-free adaptive type component capacity equipment positioning and changing system according to claim 1 is characterized in that: The clamping assembly (35) comprises a side plate (26), wherein the side plates (26) are provided in a plurality of groups and are fixedly mounted on the base (1), the side plates (26) are spaced apart from the partition plates (5), a pressure plate (27) is slidably mounted on the side plate (26), a first pressure plate (29) is fixedly mounted on one end of the pressure plate (27) close to the vertical section of the base (1), the plurality of pressure plates (27) are fixedly connected to a T-shaped moving frame (24), and a servo module (25) is provided on the base (1) for driving the moving frame (24) to move.

7. The impact-free adaptive type component capacity equipment positioning and changing system according to claim 6 is characterized in that: A second pressing plate (30) is rotatably mounted on the first pressing plate (29); an arc-shaped fixing plate (31) is fixedly mounted on one end of the second pressing plate (30) away from the rotation axis thereof; the fixing plate (31) penetrates the first pressing plate (29) and is in sliding contact with the first pressing plate (29); an electromagnet (32) is fixedly mounted on the side of the first pressing plate (29); the electromagnet (32) is in sliding contact with the fixing plate (31); the fixing plate (31) is made of a magnetic material and the electromagnet (32) adsorbs the fixing plate (31) after being energized; an elastic wire (34) is fixedly mounted on the first pressing plate (29); the elastic wire (34) is fixedly connected to an end of the fixing plate (31); a limiting frame (33) for limiting the position of the second pressing plate (30) is fixedly mounted on one end of the first pressing plate (29); the elastic wire (34) is in a stretched state when the second pressing plate (30) is in contact with the limiting frame (33).

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