A mechanical assisting device for facilitating operation of a charging pile

Abstract

The application relates to the technical field of charging pile operation auxiliary technology, and particularly discloses a mechanical auxiliary device convenient for charging pile operation, the inner side of the charging pile is provided with a charging gun through a coiler, the charging gun is arranged towards the charging pile at the socket, the auxiliary component comprises an auxiliary shell and a support, the side surface of the support is fixedly connected with the charging pile, the inner side of the support is fixedly connected with a driving piece one, the two sides of the auxiliary shell are fixedly connected with supporting shafts, the side surface of the supporting shaft is slidably connected with the inner side of the charging pile, and the side surface of the auxiliary shell is fixedly connected with a supporting block. The mechanical auxiliary device convenient for charging pile operation is provided with a pushing mechanism, the charging gun is automatically moved transversely and inserted through the driving piece three, manual pushing or force insertion is not needed, the problem of large weight and strong insertion force of the traditional charging gun is completely solved, the operation threshold of groups such as women and the elderly is greatly reduced, and charging is more labor-saving.

Description

Technical Field

[0001] This invention relates to the field of charging pile operation assistance technology, specifically a mechanical auxiliary device that facilitates the operation of charging piles. Background Technology

[0002] To combat air pollution and reduce carbon emissions, new energy vehicles, represented by electric vehicles, are becoming increasingly popular. These vehicles need to replenish their power at charging stations and other locations. Electric vehicle charging piles, as dedicated charging equipment, are essentially "gas stations" for electric vehicles. Their core function is to convert electrical energy into DC or AC power that can be absorbed by the vehicle by connecting to the power grid. They also have multiple safety protection mechanisms, including over-temperature, over-current, leakage, and lightning protection, and can be adapted to different brands and models of electric vehicles. When using them, simply connect the charging gun after the vehicle is parked and the engine is turned off, start charging in the corresponding manner, and disconnect the power and unplug the gun after charging is complete. Currently, in the charging market, the thickness of the charging cable is usually determined by the power capacity of the charging pile.

[0003] Traditional charging station charging guns are heavy and require a lot of force to insert and remove, making them difficult for women, the elderly, and other groups to operate. The charging port alignment relies on manual operation, and connection failures are prone to occur at complex parking angles or in dark environments. In addition, the cables are easy to drag and tangle on the ground, making cable retraction cumbersome. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides the following technical solution: a mechanical auxiliary device for facilitating the operation of charging piles, comprising: A charging pile, wherein a charging gun is wound around the inner side of the charging pile by a coiler, and the socket of the charging gun is facing the charging pile. An auxiliary component that facilitates charging using a charging gun; the side of the auxiliary component is fixedly connected to the charging station. The auxiliary component includes an auxiliary housing and a bracket. The side of the bracket is fixedly connected to the charging pile. A first driving component is fixedly connected to the inner side of the bracket. Support shafts are fixedly connected to both sides of the auxiliary housing. The side of the support shaft is slidably connected to the inner side of the charging pile. A support block is fixedly connected to the side of the auxiliary housing. The side of the support block is fixedly connected to the output end of the first driving component. A second driving component is fixedly connected to the side of the auxiliary housing. The output end of the second driving component is fixedly connected to the middle of the side of the movable housing. A movable housing is slidably connected to the inner side of the auxiliary housing. A second driving component is fixedly connected to the side of the auxiliary housing. A pushing mechanism is fixedly connected to the inner side of the movable housing. A guiding mechanism is fixedly connected to the side of the auxiliary housing away from the charging pile. Preferably, the pushing mechanism includes a pushing shell and a support plate. The side of the pushing shell is slidably connected to the inner side of the movable shell. The side of the support plate is fixedly connected to the upper and lower sides of the movable shell. A driving component three is fixedly connected to the side of the support plate. The output end of the driving component three is fixedly connected to the side of the pushing shell. A positioning component is fixedly connected to the inner side of the pushing shell. Preferably, the positioning component includes two positioning frames. The sides of the positioning frames are fixedly connected to the inner side of the push housing. A slider is slidably connected to the middle of the two positioning frames. A handle is fixedly connected to the side of the slider. The manual adjustment method is simple and intuitive; height adaptation can be completed simply by pulling the handle, without complicated operation steps, reducing the usage threshold for women, the elderly, and other groups. Connecting shafts are fixedly connected to the upper and lower sides of the slider. The sides of the connecting shafts are slidably connected to the inner side of the positioning frames. Sliding plates are fixedly connected to the upper and lower sides of the connecting shafts. The sides of the sliding plates are slidably connected to the inner side of the positioning frames. A first spring is sleeved on the connecting shaft. One end of the first spring is fixedly connected to the sliding plate, and the other end of the first spring is fixedly connected to the inner side of the positioning frame. The side of the slider is fixedly connected to the side of the charging gun. The design allows for manual adjustment of the charging gun height via the handle, and the slider slides up and down along the positioning frame. This design can flexibly adapt to different vehicle sizes and charging port heights, breaking the limitation of single vehicle model adaptation and improving the versatility of the device. Preferably, the guiding mechanism includes a guiding housing, the side of which is fixedly connected to the side of the auxiliary housing away from the charging pile, and wiping mechanisms are rotatably connected to both sides of the guiding housing; Preferably, the wiping mechanism includes a guide shaft, with guide wheels fixedly connected to both ends of the guide shaft. The side of the guide wheel away from the guide shaft is rotatably connected to the inner side of the guide housing. A mounting groove is provided on the side of the guide wheel near the guide shaft. The mounting groove is semi-circular in shape. A stop rod is fixedly connected to the inner side of the mounting groove. Connecting blocks are slidably connected to both sides of the stop rod. The side of the connecting block is slidably connected to the inner side of the mounting groove. A wiping wheel is rotatably connected between the two connecting blocks. When the wiping wheel contacts and rubs against the charging cable, it can promptly clean the dust and impurities attached to the side of the cable. The square groove design increases the contact area, making the cleaning more thorough and preventing impurities from sticking and affecting the stability of the charging contact. It also reduces the wear of impurities on the outer sheath of the charging cable. A second spring is sleeved on the stop rod. Both ends of the second spring are fixedly connected to the two connecting blocks. The second spring, together with the buffer structure of the connecting blocks, can alleviate the squeezing stress between the charging cable and the wiping wheel when the movement of the charging cable is too large.

[0005] This invention provides a mechanical auxiliary device that facilitates the operation of charging piles. It has the following beneficial effects: 1. This mechanical auxiliary device, which facilitates the operation of charging piles, is equipped with a pushing mechanism. The charging gun is automatically moved laterally and inserted through the drive component, eliminating the need for manual pushing or forceful insertion and removal. This completely solves the problems of heavy weight and strong insertion and removal force of traditional charging guns, significantly reducing the operating threshold for women, the elderly, and other groups, making charging more effortless.

[0006] 2. This mechanical auxiliary device, which facilitates the operation of charging piles, is equipped with a pushing mechanism. Automated docking reduces manual intervention and avoids damage to the charging gun head or vehicle charging port interface caused by improper force or alignment deviation during manual insertion and removal, thus extending the service life of the equipment.

[0007] 3. This mechanical auxiliary device, which facilitates the operation of charging piles, is equipped with a positioning component and a drive unit that drives the charging gun to move horizontally and automatically insert, eliminating the need for manual pushing and alignment. This significantly reduces the physical effort required for insertion and removal, solving the problem of traditional charging guns requiring manual force and difficult alignment, making operation more labor-saving and efficient.

[0008] 4. This mechanical auxiliary device, which facilitates the operation of the charging pile, is equipped with a wiping mechanism and a guide shaft to guide the movement of the charging cable, completely avoiding tangling of the charging cable and ensuring that the charging gun moves smoothly without jamming, making the plugging and unplugging process smoother and more efficient. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the mechanical auxiliary device for facilitating the operation of charging piles according to the present invention; Figure 2 This is an axonometric view of the present invention; Figure 3 This is a schematic diagram of the structure of the auxiliary component of the present invention; Figure 4 This is a schematic diagram of the auxiliary shell of the present invention; Figure 5 This is a schematic diagram of the structure of the actuating mechanism of the present invention; Figure 6 This is a schematic diagram of the positioning component of the present invention; Figure 7 This is a schematic diagram of the positioning frame of the present invention; Figure 8 This is a schematic diagram of the guiding mechanism of the present invention; Figure 9 This is a schematic diagram of the wiping mechanism of the present invention.

[0010] In the diagram: 1. Charging pile; 2. Auxiliary components; 21. Auxiliary housing; 22. Support shaft; 23. Bracket; 24. Drive component one; 25. Moving housing; 26. Support block; 27. Drive component two; 28. Pushing mechanism; 281. Pushing housing; 282. Support plate; 283. Drive component three; 285. Positioning assembly; 2851. Positioning frame; 2852. Connecting shaft; 2853. Slider; 2854. Sliding plate; 2855. First spring; 2856. Handle; 29. ​​Guide mechanism; 291. Guide housing; 292. Wiping mechanism; 2921. Guide wheel; 2922. Guide shaft; 2923. Mounting slot; 2924. Stop bar; 2925. Connecting block; 2926. Wiping wheel; 2927. Second spring; 3. Charging gun. Detailed Implementation

[0011] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0012] Example 1, please refer to Figures 1-2 The present invention provides a technical solution: a mechanical auxiliary device for facilitating the operation of charging piles, comprising: Charging pile 1, with a charging gun 3 wound around its inner side by a coiler, the socket of the charging gun 3 facing the charging pile 1. Auxiliary component 2, which facilitates the user to charge using the charging gun 3, and the side of the auxiliary component 2 is fixedly connected to the charging pile 1; Please see Figures 3-4 The auxiliary component 2 includes an auxiliary housing 21 and a bracket 23. The side of the bracket 23 is fixedly connected to the charging pile 1. A drive component 24 is fixedly connected to the inner side of the bracket 23. Support shafts 22 are fixedly connected to both sides of the auxiliary housing 21. The side of the support shafts 22 is slidably connected to the inner side of the charging pile 1. A support block 26 is fixedly connected to the side of the auxiliary housing 21. The side of the support block 26 is fixedly connected to the output end of the drive component 24. A drive component 27 is fixedly connected to the side of the auxiliary housing 21. The output end of the drive component 27 is fixedly connected to the middle of the side of the movable housing 25. The movable housing 25 is slidably connected to the inner side of the auxiliary housing 21. A drive component 27 is fixedly connected to the side of the auxiliary housing 21. A pushing mechanism 28 is fixedly connected to the inner side of the movable housing 25. A guiding mechanism 29 is fixedly connected to the side of the auxiliary housing 21 away from the charging pile 1. The operator issues a command through charging pile 1 to start drive component 24; The output end of the drive unit 24 drives the auxiliary housing 21 to move laterally away from the charging pile 1 through the support block 26. At the same time, the auxiliary housing 21 slides smoothly along the charging pile 1 through the support shafts 22 on both sides. After the auxiliary housing 21 is moved to the appropriate position, the second driving component 27 is activated. Its output end drives the moving housing 25 to extend longitudinally from the auxiliary housing 21, thereby pushing the mechanism 28 to move toward the vehicle charging port, so that the charging gun 3 driven by the pushing mechanism 28 is at the same horizontal plane as the vehicle charging port. During the movement of the pushing mechanism 28, the charging cable of the charging gun 3 will move synchronously under the guidance of the guiding mechanism 29 to prevent tangling. Please see Figure 5 The pushing mechanism 28 includes a pushing housing 281 and a support plate 282. The side of the pushing housing 281 is slidably connected to the inner side of the movable housing 25. The side of the support plate 282 is fixedly connected to the upper and lower sides of the movable housing 25. A driving component 283 is fixedly connected to the side of the support plate 282. The output end of the driving component 283 is fixedly connected to the side of the pushing housing 281. A positioning component 285 is fixedly connected to the inner side of the pushing housing 281. When the movable housing 25 brings the charging gun 3 to the same horizontal plane as the vehicle charging port, the drive component 283 is activated. Its output end pushes the housing 281 to drive the positioning component 285 to move laterally within the movable housing 25, thereby pushing the charging gun 3 closer to the vehicle charging port and inserting it to complete the charging work. It solves the problem that traditional charging piles 1 and charging gun 3 are heavy and have strong insertion and extraction force, which makes it inconvenient for women, the elderly and other groups to operate. At the same time, it eliminates the need for manual alignment, realizes the docking of charging gun 3 with the vehicle charging port, avoids docking failure, and greatly improves the convenience, safety and reliability of charging operation. Please see Figures 6-7 The positioning component 285 includes two positioning frames 2851. The sides of the positioning frames 2851 are fixedly connected to the inner side of the push housing 281. A slider 2853 is slidably connected to the middle of the two positioning frames 2851. A handle 2856 is fixedly connected to the side of the slider 2853. A connecting shaft 2852 is fixedly connected to both the upper and lower sides of the slider 2853. The side of the connecting shaft 2852 is slidably connected to the inner side of the positioning frame 2851. A sliding plate 2854 is fixedly connected to both the upper and lower sides of the connecting shaft 2852. Both sides of the sliding plate 2854 are slidably connected to the inner side of the positioning frame 2851. A first spring 2855 is sleeved on the connecting shaft 2852. One end of the first spring 2855 is fixedly connected to the sliding plate 2854. The other end of the first spring 2855 is fixedly connected to the inner side of the positioning frame 2851. The side of the slider 2853 is fixedly connected to the side of the charging gun 3. The output end of the drive component 283 drives the push housing 281 to move laterally inside the movable housing 25, thereby pushing the charging gun 3 sleeved inside the slider 2853 to approach and insert into the vehicle charging port. To address the height differences of charging ports for different vehicle models, when it is necessary to adjust the height of the charging gun 3, the operator can pull the handle 2856 to drive the slider 2853 to slide up and down in the two positioning frames 2851 inside the push housing 281. The slider 2853 pulls the sliding plate 2854 to move synchronously along the positioning frame 2851 through the connecting shaft 2852. During the movement of the sliding plate 2854, the first spring 2855 sleeved on the connecting shaft 2852 will be stretched to provide a buffer for height adjustment; Not only can it flexibly adapt to the charging ports of different vehicle heights to meet diverse charging needs, but it can also avoid hard impacts during adjustment through spring buffering. At the same time, it is simple and effortless to operate, reducing the usage threshold for different groups of people and further improving the adaptability and safety of charging operation. Example 2, please refer to Figure 8 Based on Embodiment 1, the present invention provides a technical solution: the guide mechanism 29 includes a guide housing 291, the side of the guide housing 291 is fixedly connected to the side of the auxiliary housing 21 away from the charging pile 1, and both sides of the guide housing 291 are rotatably connected to a wiping mechanism 292. When the charging gun 3 moves, it pulls the charging cable, causing the charging cable to be pulled out synchronously from the reel inside the charging pile 1. During the pulling process, the charging cable will pass through two wiping mechanisms 292 inside the guide shell 291, and the wiping mechanisms 292 will guide and limit it. To prevent the charging cable from getting tangled during the movement and insertion of the charging gun 3, and to prevent the charging gun 3 from getting stuck, ensuring a smooth charging operation; Please see Figure 9 The wiping mechanism 292 includes a guide shaft 2922, with guide wheels 2921 fixedly connected to both ends of the guide shaft 2922. The side of the guide wheel 2921 away from the guide shaft 2922 is rotatably connected to the inner side of the guide housing 291. A mounting groove 2923 is provided on the side of the guide wheel 2921 close to the guide shaft 2922. The mounting groove 2923 is semi-circular in shape. A stop rod 2924 is fixedly connected to the inner side of the mounting groove 2923. Connecting blocks 2925 are slidably connected to both sides of the stop rod 2924. The sides of the connecting blocks 2925 are slidably connected to the inner side of the mounting groove 2923. A wiping wheel 2926 is rotatably connected between the two connecting blocks 2925. A second spring 2927 is sleeved on the stop rod 2924. Both ends of the second spring 2927 are fixedly connected to the two connecting blocks 2925. When the charging gun 3 moves, it will drive the charging cable to move synchronously inside the guide housing 291. The charging cable slides against the guide shaft 2922 in the middle of the two guide wheels 2921. The guide shaft 2922 plays a guiding role to prevent the charging cable from getting tangled. At the same time, the charging cable comes into contact with and rubs against the wiping wheel 2926. The wiping wheel 2926 can clean the impurities attached to its side in time. The square grooves evenly opened on the wiping wheel 2926 increase the contact area with the charging cable, further improving the cleaning effect. When the charging gun 3 moves the charging cable by a large amplitude, causing excessive contact pressure between the charging cable and the wiping wheel 2926, the two wiping wheels 2926 will slide along the stop bar 2924 through the connecting block 2925. The connecting block 2925 will simultaneously squeeze the second spring 2927 on the stop bar 2924 for buffering. Not only does it ensure smooth movement of the charging gun 3 and prevent the charging cable from getting tangled and stuck, but it also cleans impurities from the charging cable through the wiping wheel 2926 and reduces pressure through the spring buffer, thereby reducing damage to the charging cable and extending its service life. At the same time, it improves the stability and reliability of the charging operation.

[0013] Specific workflow: When the operator uses the charging gun 3 to charge the vehicle, he can operate the charging pile 1 and use its auxiliary component 2 to drive the charging gun 3 to move, insert the charging gun 3 into the vehicle charging port, and thus complete the vehicle charging. The operator issues a command through charging pile 1 to start drive component 24; The output end of the drive unit 24 drives the auxiliary housing 21 to move laterally away from the charging pile 1 through the support block 26. At the same time, the auxiliary housing 21 slides smoothly along the charging pile 1 through the support shafts 22 on both sides. After the auxiliary housing 21 is moved to the appropriate position, the second driving component 27 is activated. Its output end drives the moving housing 25 to extend longitudinally from the auxiliary housing 21, thereby pushing the mechanism 28 to move toward the vehicle charging port, so that the charging gun 3 driven by the pushing mechanism 28 is at the same horizontal plane as the vehicle charging port. During the movement of the pushing mechanism 28, the charging cable of the charging gun 3 will move synchronously under the guidance of the guiding mechanism 29 to prevent tangling. When the movable housing 25 brings the charging gun 3 to the same horizontal plane as the vehicle charging port, the drive component 283 is activated. Its output end pushes the housing 281 to drive the positioning component 285 to move laterally within the movable housing 25, thereby pushing the charging gun 3 closer to the vehicle charging port and inserting it to complete the charging work. The output end of the drive component 283 drives the push housing 281 to move laterally inside the movable housing 25, thereby pushing the charging gun 3 sleeved inside the slider 2853 to approach and insert into the vehicle charging port. To address the height differences of charging ports for different vehicle models, when it is necessary to adjust the height of the charging gun 3, the operator can pull the handle 2856 to drive the slider 2853 to slide up and down in the two positioning frames 2851 inside the push housing 281. The slider 2853 pulls the sliding plate 2854 to move synchronously along the positioning frame 2851 through the connecting shaft 2852. During the movement of the sliding plate 2854, the first spring 2855 sleeved on the connecting shaft 2852 will be stretched to provide a buffer for height adjustment; When the charging gun 3 moves, it pulls the charging cable, causing the charging cable to be pulled out synchronously from the reel inside the charging pile 1. During the pulling process, the charging cable will pass through two wiping mechanisms 292 inside the guide shell 291, and the wiping mechanisms 292 will guide and limit it. To prevent the charging cable from getting tangled during the movement and insertion of the charging gun 3, and to prevent the charging gun 3 from getting stuck, ensuring a smooth charging operation; When the charging gun 3 moves, it will drive the charging cable to move synchronously inside the guide housing 291. The charging cable slides against the guide shaft 2922 in the middle of the two guide wheels 2921. The guide shaft 2922 plays a guiding role to prevent the charging cable from getting tangled. At the same time, the charging cable comes into contact with and rubs against the wiping wheel 2926. The wiping wheel 2926 can clean the impurities attached to its side in time. The square grooves evenly opened on the wiping wheel 2926 increase the contact area with the charging cable, further improving the cleaning effect. When the charging gun 3 moves the charging cable by a large amplitude, causing excessive pressure between the charging cable and the wiping wheel 2926, the two wiping wheels 2926 will slide along the stop rod 2924 through the connecting block 2925. The connecting block 2925 will simultaneously squeeze the second spring 2927 on the stop rod 2924 for buffering.

[0014] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A mechanical auxiliary device for facilitating the operation of charging piles, characterized in that, include: A charging pile (1) is provided with a charging gun (3) wound around its inner side by a coiler, and the socket of the charging gun (3) is positioned facing the charging pile (1). Auxiliary component (2) is provided to facilitate the user to charge the device using the charging gun (3). The side of the auxiliary component (2) is fixedly connected to the charging pile (1). The auxiliary component (2) includes an auxiliary housing (21) and a bracket (23). The side of the bracket (23) is fixedly connected to the charging pile (1). A drive component (24) is fixedly connected to the inner side of the bracket (23). Support shafts (22) are fixedly connected to both sides of the auxiliary housing (21). A support block (26) is fixedly connected to the side of the auxiliary housing (21). A drive component (27) is fixedly connected to the side of the auxiliary housing (21). A movable housing (25) is slidably connected to the inner side of the auxiliary housing (21). A pushing mechanism (28) is fixedly connected to the inner side of the movable housing (25). A guide mechanism (29) is fixedly connected to the side of the auxiliary housing (21) away from the charging pile (1). The guide mechanism (29) is used to guide the charging cable of the charging gun. The side of the support shaft (22) is slidably connected to the inner side of the charging pile (1), the side of the support block (26) is fixedly connected to the output end of the first drive component (24), and the output end of the second drive component (27) is fixedly connected to the middle of the side of the movable housing (25). The pushing mechanism (28) includes a pushing shell (281) and a support plate (282). A driving component three (283) is fixedly connected to the side of the support plate (282). The output end of the driving component three (283) is fixedly connected to the side of the pushing shell (281). A positioning component (285) is fixedly connected to the inner side of the pushing shell (281). The side of the push housing (281) is slidably connected to the inside of the movable housing (25), and the side of the support plate (282) is fixedly connected to the upper and lower sides of the movable housing (25). The positioning component (285) includes two positioning frames (2851), a slider (2853) is slidably connected to the middle of the two positioning frames (2851), a handle (2856) is fixedly connected to the side of the slider (2853), a connecting shaft (2852) is fixedly connected to the upper and lower sides of the slider (2853), a sliding plate (2854) is fixedly connected to the upper and lower sides of the connecting shaft (2852), a first spring (2855) is sleeved on the connecting shaft (2852), and the side of the slider (2853) is fixedly connected to the side of the charging gun (3). The side of the positioning frame (2851) is fixedly connected to the inside of the push housing (281), the side of the connecting shaft (2852) is slidably connected to the inside of the positioning frame (2851), both sides of the sliding plate (2854) are slidably connected to the inside of the positioning frame (2851), one end of the first spring (2855) is fixedly connected to the sliding plate (2854), and the other end of the first spring (2855) is fixedly connected to the inside of the positioning frame (2851).

2. The mechanical auxiliary device for facilitating the operation of charging piles according to claim 1, characterized in that: The guiding mechanism (29) includes a guiding shell (291), the side of the guiding shell (291) is fixedly connected to the side of the auxiliary shell (21) away from the charging pile (1), and both sides of the guiding shell (291) are rotatably connected to a wiping mechanism (292).

3. The mechanical auxiliary device for facilitating the operation of charging piles according to claim 2, characterized in that: The wiping mechanism (292) includes a guide shaft (2922), both ends of which are fixedly connected to guide wheels (2921). A mounting groove (2923) is provided on the side of the guide wheel (2921) near the guide shaft (2922). The mounting groove (2923) is semi-circular in shape. A stop rod (2924) is fixedly connected to the inner side of the mounting groove (2923). Connecting blocks (2925) are slidably connected to both sides of the stop rod (2924). A wiping wheel (2926) is rotatably connected between the two connecting blocks (2925). A second spring (2927) is sleeved on the stop rod (2924).

4. The mechanical auxiliary device for facilitating the operation of charging piles according to claim 3, characterized in that: The guide wheel (2921) is rotatably connected to the inner side of the guide housing (291) on the side away from the guide shaft (2922), the side of the connecting block (2925) is slidably connected to the inner side of the mounting groove (2923), and both ends of the second spring (2927) are fixedly connected to the two connecting blocks (2925).

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