Preparation method and production line of copper-aluminum composite electrode for power battery

Abstract

This invention discloses a method for preparing copper-aluminum composite electrode posts for power batteries and its production line, relating to the field of battery manufacturing technology. To address the problem of low efficiency in manual operation, the method specifically includes a support column, the outer wall of which is rotatably connected to a workstation switching platform. The inner wall of the workstation switching platform is embedded with multiple sets of limiting parts, arranged in a four-group circular array. Two sets of limiting parts are equipped with two robot arms fixed to the ground on one side. This invention, by setting up the limiting parts, robot arm one, and robot arm two, and the four sets of limiting parts, divides the entire workspace into two loading stations, one stamping station, and one unloading station. This, combined with the automatic loading of robot arm one and robot arm two, the receiving of material in the receiving box, and the stamping of the composite stamping unit, achieves automatic loading and unloading functions for electrode production, solving the problems of low safety and efficiency in manual operation.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a method for preparing copper-aluminum composite terminals for power batteries and its production line. Background Technology

[0002] The automotive power battery is one of the key components of a car. In the power battery, the battery terminals play a conductive connection function and are also one of the core components.

[0003] To enhance the performance of battery terminals, they are generally made of composite materials, with copper and aluminum composites being the most widely used. During production, copper terminals / sheets and aluminum terminals / sheets are typically combined using hot stamping.

[0004] In existing technologies, the feeding of copper and aluminum materials during stamping is done manually. On the one hand, the pressure is high during high-speed stamping, posing a safety hazard. On the other hand, the efficiency of manual feeding is also low.

[0005] To address the aforementioned issues, this invention proposes a method for preparing copper-aluminum composite terminals for power batteries and its production line. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method for preparing copper-aluminum composite terminals for power batteries and its production line.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A production line for copper-aluminum composite terminals of power batteries includes a support column. The outer wall of the support column is rotatably connected to a workstation switching table. The inner wall of the workstation switching table is embedded with multiple sets of limiting parts, which are arranged in a circular array of four sets. Two sets of the limiting parts are equipped with a robot arm 1 and a robot arm 2 fixed to the ground on one side. The bottom of the other set of the limiting parts is equipped with a receiving box placed on the ground. The top of the last set of the limiting parts is equipped with a stamping composite part installed on the side wall of the support column.

[0009] Preferably, a gear ring is fixedly installed on the top outer wall of the workstation switching platform, a gear meshes on the inner side of the gear ring, a motor is connected to the top of the gear by a key, and the motor housing is fixedly installed on the side wall of the support column.

[0010] Furthermore, the limiting part includes a limiting platform fixed to the inner side wall of the workstation switching table and a limiting through hole opened in the inner wall of the limiting platform. The cross-sectional dimensions and shape of the limiting through hole are both compatible with the cross-section of the copper and aluminum materials.

[0011] Based on the aforementioned scheme: a limiting plate is provided at the bottom of the limiting platform.

[0012] A preferred embodiment of the aforementioned scheme is that the stamping composite part includes an upper mold and a stamping head fixedly installed at the bottom of the upper mold. The stamping head is located directly above the limiting through hole, and its number, position and size correspond one-to-one with the limiting through hole.

[0013] As a further embodiment of the present invention: a lifting plate is fixedly installed on one side outer wall of the upper mold, a slider is fixedly installed on the side wall of the lifting plate, a linear slide rail is slidably fitted on the inner side wall of the slider, and the linear slide rail is fixedly installed on the side wall of the support column.

[0014] Meanwhile, a telescopic component is fixedly installed on the top outer wall of the support column, and the telescopic end of the telescopic component is fixedly installed on the top outer wall of the lifting plate.

[0015] As a preferred embodiment of the present invention: the limiting plate is arranged in two pieces, and one side of the limiting plate is provided with an opening and closing control part for driving its opening and closing. The limiting plate is connected to a support plate through a guide telescopic rod. The support plate is fixedly installed on the bottom outer wall of the workstation switching table. A spring is fixedly installed on the outer wall of the opposite side of the limiting plate and the support plate. The opening and closing control part includes a connecting rod and a "T"-shaped rod. One end of the connecting rod is rotatably connected to the limiting plate, and the other end of the connecting rod is rotatably connected to the "T"-shaped rod. The "T"-shaped rod is slidably connected to the bottom of the workstation switching table. A limiting protrusion is fixedly installed on the outer wall of the support column located at the receiving box. The limiting protrusion is the same height as the "T"-shaped rod.

[0016] Meanwhile, a lifting support part is provided at the bottom of the limiting part located at the stamping station. The lifting support part includes a telescopic component two fixedly installed on the ground and a force-applying plate fixedly installed at the telescopic end of the telescopic component two. The top outer wall of the force-applying plate is slidably connected to the support plate through a sliding rod. The support plate is attached to the bottom of the limiting plate. A spring two is sleeved on the outer wall of the sliding rod. A laser rangefinder is fixedly installed on the top outer wall of the force-applying plate.

[0017] As a preferred embodiment of the present invention: the limiting platform is slidably connected to the inner wall of the workstation switching platform via a guide block, and a second slider is slidably connected to the inner wall of the guide block. A third spring and an arc-shaped protrusion are respectively fixedly installed on both sides of the second slider. The inner wall of the limiting platform is provided with a slot that cooperates with the arc-shaped protrusion for limiting.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention, by setting up four sets of limiting parts—one limiting part, one robotic arm, and one robotic arm—divides the entire workspace into two loading stations, one stamping station, and one unloading station. This, combined with the automatic loading of robotic arms one and two, the receiving of the material box, and the stamping of the stamping compound, realizes the automatic loading and unloading function of electrode production, solving the problems of low safety and efficiency of manual operation.

[0020] 2. The present invention, by setting an opening and closing control unit, can automatically open when the limit plate reaches the unloading station, that is, the top of the receiving box, so as to realize the automatic unloading of the workpiece without manual or electronic control, thereby increasing the automation level of the device.

[0021] 3. In this invention, by setting a support plate, the extension and retraction of the telescopic component two can provide upward support to the limiting plate during stamping, thereby preventing the limiting plate from being deformed by downward impact during stamping, thus improving the reliability and lifespan of the device.

[0022] 4. In this invention, by setting up a laser rangefinder, it can detect the distance between the load-bearing plate and the force-applying plate, thereby detecting the deformation of the second spring, and thus the supporting force of the load-bearing plate can be detected. This allows the device to adjust the supporting force of the load-bearing plate in a targeted manner for specific stamping composite forces.

[0023] 5. This invention sets the limiting platform and the workstation switching platform to be movable and guided by guide blocks. The limiting and locking mechanism is achieved by the cooperation of the arc-shaped protrusion and the slot. During disassembly, the limiting platform only needs to be pulled outward. Due to the arc surface of the arc-shaped protrusion, it will retract inward, thereby realizing the quick installation and disassembly of the limiting platform, which is convenient for maintenance and replacement. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the production line for the copper-aluminum composite electrode of the power battery proposed in this invention.

[0025] Figure 2 This is a partial structural schematic diagram of the production line for the copper-aluminum composite electrode column of the power battery proposed in this invention.

[0026] Figure 3 This is a schematic diagram of the stamping composite section of the production line for the copper-aluminum composite electrode column of the power battery proposed in this invention.

[0027] Figure 4 This is a schematic diagram of the limiting part structure of the production line for the copper-aluminum composite electrode post of the power battery proposed in this invention.

[0028] Figure 5 This is a schematic diagram of the opening and closing control unit of the production line for the copper-aluminum composite electrode of the power battery proposed in this invention.

[0029] Figure 6 This is a schematic diagram of the lifting and supporting structure of the production line for the copper-aluminum composite electrode column of the power battery proposed in this invention.

[0030] Figure 7 This is a cross-sectional view of the workstation switching platform and the limiting platform of the production line for the copper-aluminum composite electrode column of the power battery proposed in this invention.

[0031] In the diagram: 1-Support column, 2-Receiving box, 3-Limiting part, 4-Workstation switching table, 5-Robot arm one, 6-Robot arm two, 7-Stamping composite part, 8-Lifting support part, 9-Motor, 10-Gear ring, 11-Gear, 12-Telescopic part one, 13-Reinforcing rib, 14-Upper mold, 15-Stamping head, 16-Linear slide rail, 17-Lifting plate, 18-Slider one, 19-Limiting platform, 20-Limiting through hole 21-Limiting plate, 22-Opening and closing control unit, 23-Support plate, 24-Guide telescopic rod, 25-Spring 1, 26-Connecting rod, 27-“T”-shaped rod, 28-Limiting protrusion, 29-Bearing plate, 30-Sliding rod, 31-Spring 2, 32-Force application plate, 33-Telescopic component 2, 34-Guide block, 35-Spring 3, 36-Slider 2, 37-Arc-shaped protrusion, 38-Slot, 39-Laser rangefinder. Detailed Implementation

[0032] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0033] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0034] Example 1:

[0035] Production lines for copper-aluminum composite terminals of power batteries, such as Figure 1-7As shown, the device includes a support column 1, with a workstation switching platform 4 rotatably connected to the outer wall of the support column 1. Multiple sets of limiting parts 3 are embedded and fixed in the inner wall of the workstation switching platform 4. In this embodiment, the number of limiting parts 3 is not limited; preferably, the limiting parts 3 are arranged in a four-group circular array. Two sets of limiting parts 3 have a robot arm 5 and a robot arm 6 fixed to the ground on one side. Another set of limiting parts 3 has a receiving box 2 placed on the ground at its bottom. The last set of limiting parts 3 has a stamping composite part 7 installed on the side wall of the support column 1 at its top. This device, by setting the limiting parts 3, robot arm 5, and robot arm 6, divides the entire workspace into two loading stations, one stamping station, and one unloading station. This, combined with the automatic loading of robot arm 5 and robot arm 6, the receiving of material from the receiving box 2, and the stamping of the stamping composite part 7, achieves automatic loading and unloading of electrodes, solving the problem of low safety and efficiency in manual operation.

[0036] To solve the workstation switching problem; such as Figure 2 As shown, a gear ring 10 is fixed to the top outer wall of the workstation switching platform 4 by bolts. A gear 11 meshes with the inner side of the gear ring 10. A motor 9 is connected to the top of the gear 11 by a key. The housing of the motor 9 is fixed to the side wall of the support column 1 by bolts. When the motor 9 starts, it can drive the gear 11 to rotate, thereby driving the workstation switching platform 4 to rotate through the gear ring 10, and thus performing workstation switching.

[0037] To solve the workpiece positioning problem; such as Figure 4 As shown, the limiting part 3 includes a limiting platform 19 fixed to the inner wall of the workstation switching table 4 and a limiting through hole 20 opened in the inner wall of the limiting platform 19. The cross-sectional dimensions and shape of the limiting through hole 20 are matched with the cross-section of the copper and aluminum materials. In this embodiment, the specific number of limiting through holes 20 is not limited. Preferably, there are 16 limiting through holes 20. A limiting plate 21 is provided at the bottom of the limiting platform 19. The first robot 5 and the second robot 6 can place the copper and aluminum materials in the limiting through holes 20. Through the limiting through holes 20 around the perimeter and the bottom support of the limiting plate 21, the three-dimensional spatial limiting of the raw materials can be realized.

[0038] To solve stamping problems; such as Figure 3 As shown, the stamping composite part 7 includes an upper mold 14 and a stamping head 15 fixed to the bottom of the upper mold 14 by bolts. The stamping head 15 is located directly above the limiting through hole 20, and its number, position and size correspond one-to-one with the limiting through hole 20. When the upper mold 14 is raised and lowered, it can drive the stamping head 15 to be raised and lowered, so that the copper and aluminum materials can be stamped and composited through the cooperation of the stamping head 15 and the limiting through hole 20.

[0039] A lifting plate 17 is fixed to one side of the outer wall of the upper mold 14 by bolts. A slider 18 is fixed to the side wall of the lifting plate 17 by bolts. A linear slide rail 16 is slidably fitted to the inner side wall of the slider 18. The linear slide rail 16 is fixed to the side wall of the support column 1 by bolts. The linear slide rail 16 and the slider 18 can guide the lifting plate 17 to rise and fall, increasing its lifting stability.

[0040] The top outer wall of the support column 1 is fixed with a telescopic component 12 by bolts. The telescopic end of the telescopic component 12 is fixed with bolts to the top outer wall of the lifting plate 17. When the telescopic component 12 extends or retracts, it can drive the lifting plate 17 to rise or fall.

[0041] The upper mold 14 and the lifting plate 17 are both welded with reinforcing ribs 13 at the top and bottom. The reinforcing ribs 13 can increase the stability of the connection between the upper mold 14 and the lifting plate 17 and prevent deformation due to impact force during stamping.

[0042] When the telescopic end of the telescopic component 12 extends, it can drive the lifting plate 17 to descend, thereby driving the stamping head 15 to descend through the upper mold 14. The longitudinal impact of the stamping head 15 can be applied to the top of the material, thereby stamping and bonding the copper and aluminum materials.

[0043] To solve the problem of automatic material feeding; such as Figure 4 , 5 As shown, the limiting plate 21 is arranged in two pieces, and one side of the limiting plate 21 is provided with an opening and closing control unit 22 for driving its opening and closing.

[0044] The limiting plate 21 is connected to the support plate 23 via the guide telescopic rod 24. The support plate 23 is fixed to the bottom outer wall of the workstation switching table 4 by bolts, and a spring 25 is welded to the outer wall of the opposite side of the limiting plate 21 and the support plate 23.

[0045] The opening and closing control unit 22 includes a connecting rod 26 and a "T"-shaped rod 27. One end of the connecting rod 26 is rotatably connected to the limiting plate 21, and the other end of the connecting rod 26 is rotatably connected to the "T"-shaped rod 27. The "T"-shaped rod 27 is slidably connected to the bottom of the workstation switching table 4. The outer wall of the support column 1 located at the receiving box 2 is fixed with a limiting protrusion 28 by bolts. The limiting protrusion 28 is at the same height as the "T"-shaped rod 27.

[0046] When the limiting plate 21 is located at the junction of robot arm 5, robot arm 6 and stamping composite part 7, no material needs to be unloaded. The two limiting plates 21 are brought together by the elastic force of spring 25, thereby sealing the bottom of the limiting through hole 20 and limiting the position. When the stamping is finished, the station switching table 4 moves the limiting plate 21 to the receiving box 2. At this time, the "T"-shaped rod 27 is limited by the limiting protrusion 28 and moves outward. This causes the two limiting plates 21 to separate from each other through the connecting rod 26, allowing the stamped composite electrode post to fall into the receiving box 2.

[0047] This device is equipped with an opening and closing control unit 22, which can automatically open when the limit plate 21 reaches the unloading station, that is, the top of the receiving box 2, so as to realize the automatic unloading of the workpiece without manual or electronic control, thus increasing the automation level of the device.

[0048] To solve the load-bearing problem, such as Figure 1 , 6 As shown, a lifting support part 8 is provided at the bottom of the limiting part 3 located in the stamping station. The lifting support part 8 includes a telescopic member 23 fixed to the ground by bolts and a force-applying plate 32 fixed to the telescopic end of the telescopic member 23 by bolts. The top outer wall of the force-applying plate 32 is slidably connected to a support plate 29 by a slide rod 30. The support plate 29 is attached to the bottom of the limiting plate 21. A spring 21 is sleeved on the outer wall of the slide rod 30.

[0049] A laser rangefinder 39 is fixed to the top outer wall of the force-applying plate 32 by bolts.

[0050] During stamping, the telescopic component 33 extends out and, through the force-applying plate 32, attaches the load-bearing plate 29 to the top of the limiting plate 21, thereby providing upward support to the limiting plate 21 and preventing the limiting plate 21 from being deformed by downward impact during stamping.

[0051] By setting the load-bearing plate 29, it can provide upward support to the limiting plate 21 during stamping by utilizing the extension and retraction of the telescopic component 33, thereby preventing the limiting plate 21 from being deformed by downward impact during stamping, thus improving the reliability and lifespan of the device.

[0052] In addition, by setting up a laser rangefinder 39, it can detect the distance between the load-bearing plate 29 and the force-applying plate 32, thereby detecting the deformation of the second spring 31, and thus the supporting force of the load-bearing plate 29 can be detected, so that the device can adjust the supporting force of the load-bearing plate 29 in a targeted manner for specific stamping composite forces.

[0053] In this embodiment, the specific types of telescopic component 12 and telescopic component 33 are not limited. They can be any type of pneumatic, hydraulic, or electric telescopic rod. Preferably, both telescopic component 12 and telescopic component 33 are hydraulic telescopic rods.

[0054] In this embodiment, during use, robotic arms 5 and 6 can respectively place the two materials to be laminated into the limiting through-hole 20. The limiting through-hole 20 and the limiting plate 21 achieve three-dimensional spatial limitation of the raw materials. After loading, motor 9 starts, driving gear 11 to rotate, which in turn drives the station switching table 4 to rotate through gear ring 10, rotating the loading limiting through-hole 20 to the bottom of the stamping lamination part 7. Then, telescopic component 12 is activated, which drives the upper mold 14 and the stamping head 15 to descend through lifting plate 17, cooperating with the limiting through-hole 20. 0 is stamped, and at the same time, the second telescopic component 33 extends out. Through the force plate 32 and the second spring 31, the bearing plate 29 is moved upward and attached to the bottom of the limiting plate 21 for support. After the stamping is completed, the first telescopic component 12 and the second telescopic component 33 are reset. The motor 9 is started again and the limiting through hole 20 is rotated to the top of the receiving box 2. At this time, the "T"-shaped rod 27 is limited by the limiting protrusion 28 and moves outward. Thus, through the connecting rod 26, the two limiting plates 21 are separated from each other, and the stamped composite electrode post falls into the receiving box 2.

[0055] Example 2:

[0056] Production lines for copper-aluminum composite terminals of power batteries, such as Figure 1 As shown, in order to solve the problem of easy replacement, this embodiment makes the following improvement to the connection between the workstation switching platform 4 and the limiting platform 19 in embodiment 1: the limiting platform 19 is slidably connected to the inner wall of the workstation switching platform 4 through the guide block 34.

[0057] The inner wall of the guide block 34 is slidably connected to a slider 36. A spring 35 and an arc-shaped protrusion 37 are welded to both sides of the slider 36 respectively. The inner wall of the limiting platform 19 is provided with a slot 38 that cooperates with the arc-shaped protrusion 37 for limiting.

[0058] By setting the limiting platform 19 and the workstation switching platform 4 to be in a movable fit, and guided by the guide block 34, and limited and locked by the cooperation of the arc protrusion 37 and the slot 38, when disassembling, it is only necessary to pull the limiting platform 19 outward. Due to the arc surface of the arc protrusion 37, it will retract inward, thereby realizing the quick installation and disassembly of the limiting platform 19, which is convenient for maintenance and replacement.

[0059] Example 3:

[0060] Preparation methods of copper-aluminum composite terminals for power batteries, such as... Figure 1-7 As shown, the following steps are included:

[0061] S1: Robot arm 15 places one of the materials, copper or aluminum, into the limiting through hole 20, and then motor 9 starts to drive the workstation switching table 4 to rotate 90 degrees to robot arm 26.

[0062] S2: Robot arm 26 places another material, copper and aluminum, into the limiting through hole 20, and then motor 9 starts to drive the workstation switching table 4 to rotate 90 degrees to the stamping composite part 7;

[0063] S3: When the telescopic component 12 is activated, it drives the upper mold 14 and the stamping head 15 to rise and fall, performing stamping compounding;

[0064] S4: Simultaneously with step S3, telescopic component 23 drives the load-bearing plate 29 to rise, supporting the limiting plate 21.

[0065] S5: After stamping and compounding are completed, motor 9 starts and drives station switching table 4 to rotate 90 degrees to unload material at receiving box 2.

[0066] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A production line for copper-aluminum composite terminals of power batteries, comprising a support column (1), characterized in that, The outer wall of the support column (1) is rotatably connected to a workstation switching platform (4). The inner wall of the workstation switching platform (4) is embedded with multiple sets of limiting parts (3). The limiting parts (3) are arranged in a circular array of four sets. Two sets of the limiting parts (3) are provided with a robot arm one (5) and a robot arm two (6) fixed to the ground on one side. The bottom of the other set of the limiting parts (3) is provided with a receiving box (2) placed on the ground. The top of the last set of the limiting parts (3) is provided with a stamping composite part (7) installed on the side wall of the support column (1). The limiting part (3) includes a limiting platform (19) fixed to the inner wall of the workstation switching platform (4) and a limiting through hole (20) opened in the inner wall of the limiting platform (19). The cross-sectional dimensions and shape of the limiting through hole (20) are all in line with the cross-section of the copper and aluminum materials. The bottom of the limiting platform (19) is provided with a limiting plate (21). The limiting plate (21) is arranged in two pieces, and an opening and closing control unit (22) for driving its opening and closing is provided on one side of the limiting plate (21). The limiting plate (21) is connected to a support plate (23) through a guide telescopic rod (24). The support plate (23) is fixedly installed on the bottom outer wall of the workstation switching table (4), and a spring (25) is fixedly installed on the outer wall of the opposite side of the limiting plate (21) and the support plate (23). The opening and closing control unit (22) Includes a connecting rod (26) and a "T"-shaped rod (27). One end of the connecting rod (26) is rotatably connected to a limiting plate (21), and the other end of the connecting rod (26) is rotatably connected to the "T"-shaped rod (27). The "T"-shaped rod (27) is slidably connected to the bottom of the workstation switching table (4). A limiting protrusion (28) is fixedly installed on the outer wall of one side of the support column (1) located at the receiving box (2). The limiting protrusion (28) is the same height as the "T"-shaped rod (27). The bottom of the limiting part (3) located at the stamping station is provided with a lifting bearing part (8). The lifting bearing part (8) includes a telescopic component two (33) fixedly installed on the ground and a force-applying plate (32) fixedly installed on the telescopic end of the telescopic component two (33). The top outer wall of the force-applying plate (32) is slidably connected to a bearing plate (29) through a slide rod (30). The bearing plate (29) is attached to the bottom of the limiting plate (21). The outer wall of the slide rod (30) is fitted with a spring two (31). The top outer wall of the force-applying plate (32) is fixedly installed with a laser rangefinder (39).

2. The production line for copper-aluminum composite terminals of power batteries according to claim 1, characterized in that, A gear ring (10) is fixedly installed on the top outer wall of the workstation switching platform (4). A gear (11) meshes with the inner side of the gear ring (10). A motor (9) is connected to the top of the gear (11) by a key. The housing of the motor (9) is fixedly installed on the side wall of the support column (1).

3. The production line for copper-aluminum composite terminals of power batteries according to claim 1, characterized in that, The stamping composite part (7) includes an upper mold (14) and a stamping head (15) fixedly installed at the bottom of the upper mold (14). The stamping head (15) is located directly above the limiting through hole (20), and its number, position and size are all in correspondence with the limiting through hole (20).

4. The production line for copper-aluminum composite terminals of power batteries according to claim 3, characterized in that, A lifting plate (17) is fixedly installed on one side of the outer wall of the upper mold (14). A slider (18) is fixedly installed on the side wall of the lifting plate (17). A linear slide rail (16) is slidably fitted on the inner side wall of the slider (18). The linear slide rail (16) is fixedly installed on the side wall of the support column (1).

5. The production line for copper-aluminum composite terminals of power batteries according to claim 4, characterized in that, The top outer wall of the support column (1) is fixedly installed with a telescopic component (12), and the telescopic end of the telescopic component (12) is fixedly installed on the top outer wall of the lifting plate (17).

6. The production line for copper-aluminum composite terminals of power batteries according to claim 1, characterized in that, The limiting platform (19) is slidably connected to the inner wall of the workstation switching platform (4) via the guide block (34). The inner wall of the guide block (34) is slidably connected to the slider two (36). The two sides of the slider two (36) are respectively fixedly installed with the spring three (35) and the arc-shaped protrusion (37). The inner wall of the limiting platform (19) is provided with a slot (38) that cooperates with the arc-shaped protrusion (37) for limiting.

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