Expansion water tank of new energy automobile

Abstract

The utility model discloses a new energy automobile expansion water tank which comprises a fixing seat and a water tank body, a peripheral plate is fixedly arranged on the outer side of the fixing seat, a front baffle is fixedly arranged in the peripheral plate, the water tank body is arranged in the peripheral plate, and quick fixing mechanisms are arranged on the outer sides of the fixing seat and the water tank body. The quick fixing mechanism comprises inserting rods and a fixing plate, the inserting rods are fixed to the top face of the peripheral plate, the fixing plate is fixed to the outer wall of the water tank body and connected with the inserting rods in an inserted mode, a fixing sleeve is fixedly arranged on the top face of the fixing plate, multiple sets of sliding blocks are slidably arranged on the outer wall of the fixing sleeve, clamping blocks are fixedly arranged at the bottom ends of the sliding blocks, and clamping grooves are formed in the outer walls of the inserting rods. The top ends of the multiple sets of sliding blocks are fixedly provided with pushing blocks, the outer wall of the fixing sleeve is provided with multiple sets of movable grooves, the movable grooves are slidably connected with the multiple sets of pushing blocks correspondingly, and the quick fixing mechanism achieves quick connection of the water tank body and the fixing base through the design that an inserting rod is matched with a fixing plate in an inserted mode.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle technology, and more specifically, it relates to an expansion tank for new energy vehicles. Background Technology

[0002] In the field of modern new energy vehicle cooling systems, the expansion tank, as a key component for regulating coolant volume changes, directly impacts the quality of vehicle production and after-sales service through its installation and maintenance efficiency. Traditional expansion tanks on production lines typically employ multi-point bolt fastening or complex snap-fit ​​structures for fixation. Installation workers need to use various tools and perform fastening operations in a specific sequence, a cumbersome and time-consuming process. Especially in assembly line environments, this inefficient installation method significantly extends the vehicle assembly cycle and reduces production efficiency. Furthermore, the complexity of the fixing structure makes it prone to quality problems such as omissions and incorrect installations during the installation process, affecting product reliability and failing to meet the dual requirements of efficient assembly and stable quality in the modern automotive manufacturing industry.

[0003] In the maintenance and repair of new energy vehicles, since the expansion tank is often located in a small space inside the engine compartment, technicians need to complete the disassembly and assembly work within a limited operating area. Traditionally designed expansion tanks have complex connections, and disassembly often requires the removal of surrounding components to obtain sufficient operating space and the use of special tools to unlock and remove them. This not only significantly extends the repair time and increases the labor intensity, but also easily damages the tank or surrounding components due to improper operation. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the problems existing in the prior art, this utility model provides an expansion tank for new energy vehicles to solve the technical problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: an expansion tank for new energy vehicles, comprising a fixed base and a tank body. An outer perimeter plate is fixedly mounted on the outer side of the fixed base, and a front baffle plate is fixedly mounted inside the outer perimeter plate. The tank body is disposed within the outer perimeter plate. A quick-release mechanism is provided between the fixed base and the outer side of the tank body. The quick-release mechanism includes a rod and a fixing plate. The rod is fixed to the top surface of the outer perimeter plate, and the fixing plate is fixed to the outer wall of the tank body and inserted into the rod. A fixing sleeve is fixedly mounted on the top surface of the fixing plate. A slider is slidably mounted on the outer wall of the fixing sleeve. Multiple sets of sliders are provided, each with a locking block fixed at its bottom. A locking groove is opened on the outer wall of the rod. Push blocks are fixedly mounted at the top of each set of sliders. A movable groove is opened on the outer wall of the fixing sleeve. Multiple sets of movable grooves are provided and slidably connected to multiple sets of push blocks. Push springs are connected between each set of push blocks and the movable groove. A limiting mechanism is provided on the outer side of the fixing sleeve. The limiting mechanism includes a limiting sleeve and a rotating sleeve. The limiting sleeve slides on the outer wall of the fixing sleeve, and the rotating sleeve rotates on the outer wall of the fixing sleeve.

[0008] The present invention is further configured such that a support plate is fixedly provided on the outer side of the rotating sleeve, and multiple sets of support plates are provided and distributed on the outer wall of the rotating sleeve. Each set of support plates has a limiting block fixedly provided on its inner wall. A limiting groove is opened on the outer wall of the limiting sleeve. The multiple sets of limiting blocks slide in the limiting groove, forming a rotation-limiting linkage mechanism. When the rotating sleeve rotates, the limiting block slides in the limiting groove, realizing precise control of the position of the limiting sleeve and ensuring the reliability and stability of the locking state.

[0009] The present invention is further configured such that an unlocking groove is provided on the outer side of the limiting sleeve, and multiple sets of unlocking grooves are provided to create a clear unlocking path. When the rotating sleeve is rotated to a specific position, the limiting block can enter the unlocking groove, realizing a quick switch between the limiting state and the unlocking state, simplifying the operation process and enhancing the user experience.

[0010] The present invention is further configured such that a positioning slide bar is fixedly provided on the outer wall of the water tank body, and positioning grooves are provided on the inner side of the outer plate and the side baffle. Multiple sets of positioning slide bars and positioning grooves are provided and slidably connected, thus constructing a precise installation guide system. During installation, the slide bar moves along the groove to ensure accurate positioning of the water tank body, prevent offset and misalignment, and at the same time provide additional support to disperse installation stress.

[0011] The present invention is further configured such that a liquid injection pipe is connected to the top surface of the water tank body, and a signal pipe is connected to the outer wall of the water tank body, thereby realizing the integrity of the system functions. The liquid injection pipe facilitates the addition and replacement of coolant, and the signal pipe can be connected to a temperature or liquid level sensor for real-time monitoring, thereby improving the maintainability and safety of the entire cooling system.

[0012] The present invention is further configured such that a guide groove is provided on the outer wall of the fixed sleeve, and a guide block is fixedly provided on the inner side of the limiting sleeve. Multiple sets of the guide groove and the guide block are provided and slidably connected to form a precise axial guiding structure, which restricts the rotational freedom of the limiting sleeve to only allow it to move along the axial direction, ensuring the accuracy and stability of the limiting action, reducing wear between components and improving service life.

[0013] The present invention is further configured such that a sliding hole is provided in the insertion rod, a top block is slidably provided in the sliding hole, and a compression spring is provided between the top block and the movable groove, forming an automatic auxiliary pop-out mechanism. After unlocking, the compression spring releases energy to push the top block and thus push the insertion rod to disengage from the fixed sleeve, eliminating the need for manual removal of the insertion rod and greatly improving the convenience of disassembly and the efficiency of operation.

[0014] The present invention is further configured such that a pressing block is fixedly provided on the bottom surface of the rotating sleeve, and multiple sets of pressing blocks are provided. A guide plate is fixedly provided on the outer wall of the fixed sleeve, and multiple sets of guide plates are provided, each connected to a reset spring. An arc-shaped rod is fixedly provided on the outer wall of each set of pressing blocks, and the arc-shaped rods are slidably connected to the guide plates, thus establishing an automatic reset and guiding system. After rotation, the reset spring causes the rotating sleeve to automatically return to the locked state. The cooperation between the arc-shaped rods and the guide plates restricts the movement trajectory of the pressing blocks, ensuring the smoothness and accuracy of the rotation operation and preventing damage to the mechanism due to excessive rotation.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides an expansion tank for new energy vehicles, which has the following beneficial effects:

[0017] 1. The quick-connect mechanism achieves rapid connection between the water tank body and the fixed base through the plug-in joint design of the plug rod and the fixed plate. The slider design on the outer wall of the fixed sleeve allows the locking block to move radially and engage with the slot on the plug rod. The sliding cooperation of multiple sets of push blocks and movable slots provides an operating interface. The elastic design of the push spring ensures that the locking block can automatically return to its original position and unlock after being released. The engagement of the locking block and the slot forms a reliable mechanical connection. The combination of the top block and the compression spring allows the plug rod to automatically pop out after unlocking without manual removal. This multi-safe plug-in structure completely solves the problem of cumbersome disassembly and assembly of traditional bolt connections, and greatly improves the installation and disassembly efficiency of expansion tanks for new energy vehicles.

[0018] 2. The limiting mechanism adopts a dual protection design of limiting sleeve and rotating sleeve. The support plate on the outside of the rotating sleeve and the limiting block form a rotary drive system. The alternating distribution of the limiting groove and the unlocking groove realizes a clear switch between the locking and unlocking states. The cooperation between the guide groove and the guide block ensures the smooth sliding of the limiting sleeve. The return spring between the extrusion block and the guide plate provides an automatic return function. The arc-shaped rod design restricts the movement trajectory of the extrusion block. The extrusion block on the bottom surface of the rotating sleeve forms a linkage mechanism with the fixed sleeve through an elastic element. This rotary locking mechanism allows the operator to complete the locking and unlocking with just a simple rotation, which greatly improves the convenience and safety of operation.

[0019] 3. The positioning slide strips on the outer wall of the water tank body and the positioning slide grooves on the outer plate form a precise guiding system, ensuring accurate alignment during water tank installation. The reserved design of the injection pipe and signal pipe facilitates the connection and monitoring of the subsequent cooling system. The combination structure of the fixed seat, outer plate, and front baffle provides a stable support frame. The water tank body is placed inside the outer plate to form a protective barrier. This overall layout not only ensures the stable installation of the water tank but also takes into account the convenience of disassembly and assembly, meeting the actual needs of new energy vehicles for rapid maintenance and replacement of cooling system components. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an expansion tank for a new energy vehicle according to the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the fixing base in this utility model;

[0022] Figure 3 This is a schematic diagram of the quick-assembly mechanism in this utility model;

[0023] Figure 4 This is a cross-sectional view of the fixing sleeve in this utility model;

[0024] Figure 5 This is a cross-sectional view of the insertion rod in this utility model.

[0025] In the diagram: 1. Fixed base; 2. Water tank body; 3. Outer plate; 4. Front baffle; 5. Insert rod; 6. Fixed plate; 7. Fixed sleeve; 8. Slider; 9. Locking block; 10. Locking groove; 11. Push block; 12. Movable groove; 13. Push spring; 14. Limiting sleeve; 15. Rotating sleeve; 16. Support plate; 17. Limiting block; 18. Limiting groove; 19. Unlocking groove; 20. Positioning slide bar; 21. Positioning slide groove; 22. Injection pipe; 23. Signal pipe; 24. Guide groove; 25. Guide block; 26. Sliding hole; 27. Top block; 28. Compression spring; 29. ​​Squeezing block; 30. Guide plate; 31. Reset spring; 32. Arc rod. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0029] Please see Figures 1-5 An expansion tank for a new energy vehicle includes a fixed base 1 and a tank body 2. An outer perimeter plate 3 is fixedly mounted on the outer side of the fixed base 1, and a front baffle 4 is fixedly mounted inside the outer perimeter plate 3. The tank body 2 is disposed within the outer perimeter plate 3. A quick-connect mechanism is provided between the fixed base 1 and the outer side of the tank body 2. The quick-connect mechanism includes a rod 5 and a fixing plate 6. The rod 5 is fixed to the top surface of the outer perimeter plate 3, and the fixing plate 6 is fixed to the outer wall of the tank body 2 and inserted into the rod 5. A fixing sleeve 7 is fixedly mounted on the top surface of the fixing plate 6, and a slider 8 is slidably mounted on the outer wall of the fixing sleeve 7. The slider 8 is equipped with... The device has multiple sets of locking blocks 9 fixed at the bottom, a locking groove 10 on the outer wall of the insert rod 5, a push block 11 fixed at the top of each of the multiple sets of sliders 8, a movable groove 12 on the outer wall of the fixed sleeve 7, multiple sets of movable grooves 12 and each set of push blocks 11 are slidably connected to the multiple sets of push blocks 11, a push spring 13 is connected between each set of push blocks 11 and the movable groove 12, a limit mechanism is provided on the outer side of the fixed sleeve 7, the limit mechanism includes a limit sleeve 14 and a rotating sleeve 15, the limit sleeve 14 slides on the outer wall of the fixed sleeve 7, and the rotating sleeve 15 rotates on the outer wall of the fixed sleeve 7.

[0030] A support plate 16 is fixedly provided on the outer side of the rotating sleeve 15. Multiple sets of support plates 16 are provided and distributed on the outer wall of the rotating sleeve 15. Limiting blocks 17 are fixedly provided on the inner wall of each set of support plates 16. Limiting grooves 18 are opened on the outer wall of the limiting sleeve 14. The multiple sets of limiting blocks 17 slide in the limiting grooves 18. This structure is based on the principle of rotational transmission. When the rotating sleeve 15 rotates, the multiple sets of support plates 16 rotate synchronously, driving the limiting blocks 17 to slide in the limiting grooves 18, forming a mechanical constraint and realizing the linkage control of rotational motion and limiting state.

[0031] The outer side of the limiting sleeve 14 is provided with an unlocking groove 19. There are multiple sets of unlocking grooves 19. This design adopts the state switching principle. The unlocking groove 19 and the limiting groove 18 form a channel system with a specific angle distribution. When the rotating sleeve 15 rotates to a specific position, the limiting block 17 can move from the limiting groove 18 to the unlocking groove 19 to realize the state transition from locked to unlocked.

[0032] The outer wall of the water tank body 2 is fixedly provided with a positioning slide strip 20, and the inner side of the outer plate 3 and the side baffle are provided with positioning slide grooves 21. Multiple sets of positioning slide strips 20 and positioning slide grooves 21 are provided and slidably connected. This structure applies the principle of sliding guidance. During installation, the positioning slide strip 20 slides along the positioning slide groove 21, providing a precise installation path and position constraint, ensuring that the water tank body 2 is accurately positioned and the fixing force is distributed.

[0033] The top surface of the water tank body 2 is connected to a liquid injection pipe 22, and the outer wall of the water tank body 2 is connected to a signal pipe 23. This design is based on the system interface principle. The liquid injection pipe 22 provides a channel for adding and circulating coolant, while the signal pipe 23 serves as a connection interface for temperature or liquid level sensors, thus realizing the integrity and monitorability of the system functions.

[0034] The outer wall of the fixed sleeve 7 is provided with a guide groove 24, and the inner side of the limiting sleeve 14 is fixed with a guide block 25. The guide groove 24 and the guide block 25 are provided in multiple sets and are slidably connected. This mechanism uses the principle of track constraint. The guide block 25 can only move in a specific direction in the guide groove 24, which restricts the rotational freedom of the limiting sleeve 14 and ensures that it can only slide along the axial direction without deflection.

[0035] The insertion rod 5 has a sliding hole 26, and a top block 27 is slidably disposed in the sliding hole 26. A compression spring 28 is connected between the top block 27 and the movable groove 12. This system uses the principle of elastic potential energy. When installed, the top block 27 is compressed by force to store energy in the compression spring 28. After unlocking, the compression spring 28 releases energy to push the top block 27 and the insertion rod 5 out of the fixed sleeve 7, forming an automatic pop-out mechanism to assist in disassembly.

[0036] The bottom surface of the rotating sleeve 15 is fixedly provided with a pressing block 29, and multiple sets of pressing blocks 29 are provided. The outer wall of the fixed sleeve 7 is fixedly provided with a guide plate 30, and multiple sets of guide plates 30 are provided. Each set of guide plates 30 is connected to a return spring 31. The outer wall of each set of pressing blocks 29 is fixedly provided with an arc-shaped rod 32. The multiple sets of arc-shaped rods 32 are slidably connected to the multiple sets of guide plates 30. This mechanism combines the principles of cam pressing and elastic reset. When the rotating sleeve 15 rotates, the pressing block 29 compresses the return spring 31 and slides along the guide plate 30. The arc-shaped rod 32 restricts the movement trajectory of the pressing block 29. After being released, the return spring 31 pushes the pressing block 29 to drive the rotating sleeve 15 back to its locked position.

[0037] In this embodiment, when it is necessary to fix the water tank body 2, the water tank body 2 is positioned and installed by inserting multiple sets of positioning slide strips 20 into the positioning slide grooves 21. At the same time, the insertion rod 5 is inserted into the fixing sleeve 7, and the compression spring 28 is squeezed by the top block 27. The rotating sleeve 15 drives multiple sets of support plates 16 to rotate and causes multiple sets of limiting blocks 17 to slide into the unlocking groove 19. At the same time, the rotating sleeve 15 drives multiple sets of pressing blocks 29 to press multiple sets of reset springs 31 respectively, pushing the limiting sleeve 14 to abut against the outer wall of multiple sets of push blocks 11, so that multiple sets of push blocks 11 press the push spring 13 and push the locking block 9 into the locking groove 10 through the slider 8. The rotating sleeve 15 is released, and the pressing block 29 is pushed by the elastic reset of multiple sets of reset springs 31, thereby driving the rotating sleeve 15 to rotate and driving multiple sets of support plates 16 to rotate, so that multiple sets of limiting blocks 17 slide into the limiting groove 18 to fix the limiting sleeve 14, thus completing the rapid fixation of the water tank body 2.

[0038] More specifically, when it is necessary to disassemble the water tank body 2, rotating the rotating sleeve 15 drives multiple sets of support plates 16 to move, causing the limiting block 17 to move into the unlocking groove 19. At the same time, multiple sets of pressing blocks 29 press the reset spring 31, pushing the limiting sleeve 14 to release the contact with multiple sets of push sleeves. Multiple sets of push springs 13 push the push block 11 and the slider 8 pulls the locking block 9 out of the locking groove 10, releasing the locking of the insertion rod 5. Then the water tank body 2 can be disassembled.

[0039] In summary, during use or operation of the overall equipment: when it is necessary to fix the water tank body 2, the water tank body 2 is positioned and installed by inserting multiple sets of positioning slide bars 20 into the positioning slide grooves 21. At the same time, the insertion rod 5 is inserted into the fixing sleeve 7, and the top block 27 presses the compression spring 28. The rotating sleeve 15 drives multiple sets of support plates 16 to rotate and causes multiple sets of limiting blocks 17 to slide into the unlocking groove 19. At the same time, the rotating sleeve 15 drives multiple sets of pressing blocks 29 to press multiple sets of return springs 31 respectively, pushing the limiting sleeve 14 to abut against the outer wall of multiple sets of push blocks 11, so that multiple sets of push blocks 11 press the push spring 13 and push the locking block 9 into the locking groove 10 through the slider 8. When the rotating sleeve 15 is released, the multiple sets of return springs 31 elastically reset and push the pressing block 29, thereby driving the rotating sleeve 15 to rotate and driving multiple sets of support plates 16 to rotate, so that multiple sets of limiting blocks 17 slide into the limiting groove 18 to fix the limiting sleeve 14, thus completing the rapid fixing of the water tank body 2.

[0040] When it is necessary to disassemble the water tank body 2, rotating the rotating sleeve 15 drives multiple sets of support plates 16 to move, causing the limiting block 17 to move into the unlocking groove 19. At the same time, multiple sets of pressing blocks 29 press the reset spring 31, pushing the limiting sleeve 14 to release the contact with multiple sets of push sleeves. Multiple sets of push springs 13 push the push block 11 and the slider 8 pulls the locking block 9 out of the locking groove 10, releasing the locking of the insertion rod 5. Then the water tank body 2 can be disassembled.

[0041] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other well-known connection methods. They will not be elaborated here. For all the fixed connections mentioned above, welding is the preferred option.

[0042] In all the solutions mentioned above, those involving the operation of electrical components, unless otherwise specified, are controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and circuit connections are existing, well-known, and mature technologies, and their specific circuit structures will not be described in detail here.

[0043] Of all the solutions mentioned above, those involving motors can be combined with reducers if necessary. The connection structure and working principle between the motor and the reducer are existing known technologies and will not be addressed in this utility model.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An expansion tank for new energy vehicles, comprising a mounting base (1) and a tank body (2), characterized in that: An outer plate (3) is fixedly provided on the outside of the fixed base (1), and a front baffle (4) is fixedly provided inside the outer plate (3). The water tank body (2) is set inside the outer plate (3). A quick-fixing mechanism is provided on the outside of the fixed base (1) and the water tank body (2). The quick-fixing mechanism includes a plug rod (5) and a fixing plate (6). The plug rod (5) is fixed on the top surface of the outer plate (3), and the fixing plate (6) is fixed on the outer wall of the water tank body (2) and plugged into the plug rod (5). A fixing sleeve (7) is fixedly provided on the top surface of the fixing plate (6), and a slider (8) is slidably provided on the outer wall of the fixing sleeve (7). Multiple sliders (8) are provided, and each slider has a locking block fixed at its bottom. (9) A slot (10) is provided on the outer wall of the insert rod (5). Push blocks (11) are fixedly provided at the top of each of the multiple sets of sliders (8). A movable groove (12) is provided on the outer wall of the fixed sleeve (7). Multiple sets of movable grooves (12) are provided and are slidably connected to multiple sets of push blocks (11). Push springs (13) are connected between the multiple sets of push blocks (11) and the movable grooves (12). A limiting mechanism is provided on the outer side of the fixed sleeve (7). The limiting mechanism includes a limiting sleeve (14) and a rotating sleeve (15). The limiting sleeve (14) slides on the outer wall of the fixed sleeve (7), and the rotating sleeve (15) rotates on the outer wall of the fixed sleeve (7).

2. The expansion tank for new energy vehicles according to claim 1, characterized in that: The rotating sleeve (15) is fixedly provided with a support plate (16) on the outside. The support plate (16) is provided in multiple sets and distributed on the outer wall of the rotating sleeve (15). The inner wall of each set of support plates (16) is fixedly provided with a limiting block (17). The outer wall of the limiting sleeve (14) is provided with a limiting groove (18). The multiple sets of limiting blocks (17) slide in the limiting groove (18).

3. The expansion tank for new energy vehicles according to claim 2, characterized in that: The limiting sleeve (14) has an unlocking groove (19) on its outer side, and there are multiple sets of unlocking grooves (19).

4. The expansion tank for new energy vehicles according to claim 3, characterized in that: The outer wall of the water tank body (2) is fixedly provided with a positioning slide (20), and the inner side of the outer plate (3) and the side baffle are provided with positioning slide grooves (21). The positioning slide (20) and the positioning slide groove (21) are provided in multiple sets and are slidably connected.

5. The expansion tank for new energy vehicles according to claim 4, characterized in that: The top surface of the water tank body (2) is connected to an injection pipe (22), and the outer wall of the water tank body (2) is connected to a signal pipe (23).

6. The expansion tank for new energy vehicles according to claim 5, characterized in that: The outer wall of the fixed sleeve (7) is provided with a guide groove (24), and the inner side of the limiting sleeve (14) is fixed with a guide block (25). The guide groove (24) and the guide block (25) are provided in multiple sets and are slidably connected.

7. The expansion tank for new energy vehicles according to claim 6, characterized in that: The insert (5) has a sliding hole (26) inside, and a top block (27) is slidably provided in the sliding hole (26). A compression spring (28) is connected between the top block (27) and the movable groove (12).

8. The expansion tank for new energy vehicles according to claim 7, characterized in that: The bottom surface of the rotating sleeve (15) is fixedly provided with an extrusion block (29), and there are multiple sets of extrusion blocks (29). The outer wall of the fixed sleeve (7) is fixedly provided with a guide plate (30), and there are multiple sets of guide plates (30) and a reset spring (31) is connected between each set of extrusion blocks (29). The outer wall of each set of extrusion blocks (29) is fixedly provided with an arc-shaped rod (32), and the multiple sets of arc-shaped rods (32) are slidably connected to the multiple sets of guide plates (30).

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