Rotary sweeping road leaf cleaning equipment

Abstract

This utility model relates to the technical field of leaf cleaning equipment, specifically a rotary sweeping road leaf cleaning device. It includes a leaf cleaning device body, which comprises a leaf suction hood. A drive assembly is located on the front side of the suction hood, and a quick-release assembly is located on the rear side. A cleaning brush roller is positioned between the drive assembly and the quick-release assembly. The drive assembly includes a first fixed side plate bolted to the front side of the suction hood. A motor is mounted on the front side of the first fixed side plate via a mounting plate. A rectangular sleeve block is coaxially connected to the motor's output shaft. A rectangular mating block, which inserts into the rectangular sleeve block, is located at the center of the front end of the cleaning brush roller. This rotary sweeping road leaf cleaning device simplifies the replacement process of the cleaning brush roller through the linkage design of the upper and lower covers, locking components, and positioning grooves of the quick-release assembly. Fixing or disassembling is achieved simply by closing the upper and lower covers and pulling the locking components, eliminating the need to disassemble the rotating shaft. This significantly reduces maintenance time and improves equipment efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of leaf cleaning equipment, specifically a rotary sweeping road leaf cleaning equipment. Background Technology

[0002] Roadside leaf removal equipment is a mechanical device specifically designed to remove fallen leaves from urban roads, green spaces, parks, and other public areas. With the continuous development of urban greening, the problem of fallen leaves has gradually become a pressing issue in urban management. Fallen leaves not only affect the aesthetics of the city but can also cause slippery roads, posing safety hazards to pedestrians and vehicles. Therefore, roadside leaf removal equipment is particularly important. This type of equipment typically combines vacuuming, sweeping, and collection functions to achieve rapid and thorough leaf removal, ensuring a clean and safe urban environment.

[0003] Patent CN221589437U discloses a leaf-collecting device for road cleaning, including a collection box. A conveying pipe is fixedly connected to the inner wall of the collection box, and a telescopic rod is fixedly connected to the lower end of the conveying pipe. A spring is sleeved on the telescopic rod, and a leaf-suction hood is fixedly connected to the telescopic end of the telescopic rod. A collection hopper is fixedly connected to the lower end of the leaf-suction hood. A fan and a servo motor drive a cleaning brush roller to rotate via a rotating shaft. The cleaning brush roller sweeps the accumulated leaves into the collection hopper. The fan creates negative pressure in the collection box, causing the leaves to pass through the leaf-suction hood and the conveying pipe into the collection box. This avoids the problem of the cleaning vehicle only using a negative pressure suction cup under the vehicle to suck up the leaves after they have accumulated. This allows the cleaning vehicle to clean up a large number of leaves in a short time, and also removes the leaves that remain after the cleaning vehicle has cleaned them, thus improving the cleaning effect.

[0004] The aforementioned existing technology utilizes a servo motor to drive the sweeping brush rollers to rotate. As the brush rollers contact the road, they sweep accumulated leaves into a collection hopper and then transport them to a collection box via a negative pressure mechanism. However, due to the direct contact between the sweeping brush rollers and the road, they wear down over time, leading to a decrease in cleaning efficiency. Therefore, regular replacement of the sweeping brush rollers is necessary. In existing technologies, the sweeping brush rollers are sleeved on the outside of a rotating shaft, requiring workers to disassemble the shaft before replacement. This process is cumbersome and time-consuming, impacting equipment efficiency. Furthermore, the rotating shaft is typically installed between two fixed plates, further increasing the difficulty of replacing the sweeping brush rollers. Therefore, to address this issue, we propose a rotary sweeping road leaf cleaning device designed to simplify the replacement process and improve equipment convenience and cleaning efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a rotary sweeping road leaf cleaning device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A rotary sweeping road leaf cleaning device includes a leaf cleaning device body, which includes a collection box. The bottom of the collection box has a base plate, and four wheels arranged in a matrix are located on the bottom of the base plate. A fan and push rod handle are located on the right side of the collection box, and a conveying pipe connected to a leaf suction hood is located on the left side of the collection box. The specific working principle of the leaf cleaning device body is based on existing technology, such as the detailed working principle described in patent publication CN221589437U, which will not be repeated here. The leaf cleaning device body includes a leaf suction hood, which guides the swept leaves to the collection box through negative pressure adsorption. Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a drive assembly is provided on the front side of the leaf suction cover. The drive assembly is used to drive the cleaning brush roller to rotate. A quick-release assembly is provided on the rear side of the leaf suction cover. The quick-release assembly is used to realize the quick disassembly and installation of the cleaning brush roller. The cleaning brush roller is provided between the drive assembly and the quick-release assembly. The cleaning brush roller directly contacts the road surface by rotating and sweeps the fallen leaves to the leaf suction cover.

[0008] The drive assembly includes a first fixed side plate bolted to the front of the leaf suction hood. The first fixed side plate is used to fix the motor and provide a support structure. The motor is mounted on the front of the first fixed side plate via a mounting plate. The motor outputs rotational driving force as a power source and is powered by the power supply system of the leaf cleaning equipment body and controlled by the control system. The output shaft of the motor is coaxially connected to a rectangular sleeve block. The front end of the sweeping brush roller is provided with a rectangular docking block that inserts into the rectangular sleeve block. The rectangular sleeve block and the rectangular docking block are inserted to realize power transmission. The rectangular docking block is designed with a non-circular cross section to prevent the sweeping brush roller from slipping on the drive assembly.

[0009] The quick-release assembly includes a second fixed side plate bolted to the rear side of the suction hood. The second fixed side plate is used to fix the upper and lower covers of the quick-release assembly. The upper cover is rotatably connected to the top left side of the second fixed side plate via a first U-shaped seat. The first U-shaped seat allows the upper cover to rotate around an axis to achieve opening and closing. The lower cover is rotatably connected to the bottom left side of the second fixed side plate via a second U-shaped seat. The second U-shaped seat allows the lower cover to rotate around an axis and cooperates with the upper cover to fix the second sealing bearing. A rotating shaft is provided in the middle of the rear end of the cleaning brush roller. The rotating shaft serves as the rear end support structure of the cleaning brush roller. A connecting shaft is integrally formed at the rear end of the rotating shaft. The outer diameter of the connecting shaft is smaller than the outer diameter of the rotating shaft. The connecting shaft is used to connect the second sealing bearing and transmit rotational stability. The outer wall of the connecting shaft is fitted with the second sealing bearing. The second sealing bearing reduces rotational resistance and prevents dust from entering the bearing. The second sealing bearing is located between the lower cover and the upper cover. After the lower cover and the upper cover are closed, the second sealing bearing is clamped to limit its axial displacement.

[0010] When installing the cleaning brush roller, first insert the rectangular mating block at the front end of the cleaning brush roller into the rectangular sleeve block, then close the lower cover and the upper cover to fix the second sealing bearing in the first positioning groove and the second positioning groove, and use the locking piece to fix the position of the connecting protrusion and the L-shaped connecting plate.

[0011] Preferred, such as Figure 3 As shown, the output shaft of the motor is connected to the first fixed side plate through a first sealed bearing, and the first sealed bearing reduces the friction of the motor output shaft.

[0012] Preferred, such as Figure 4 As shown, the bottom of the upper cover is provided with a first positioning groove, and the top of the lower cover is provided with a second positioning groove. The outer ring of the second sealing bearing is located between the first positioning groove and the second positioning groove. The first positioning groove and the second positioning groove cooperate to clamp the outer ring of the second sealing bearing to restrict its radial movement.

[0013] Preferred, such as Figure 7 As shown, a connecting protrusion is provided at the bottom left end of the upper cover, and a positioning slot is provided on the left side of the connecting protrusion. The positioning slot cooperates with the pull rod to realize the quick locking and unlocking of the locking component.

[0014] Preferred, such as Figure 6 As shown, the top left end of the lower cover is provided with an L-shaped connecting plate. The L-shaped connecting plate provides an installation base for the locking component and restricts the displacement of the connecting protrusion. When the lower cover and the upper cover are closed, the connecting protrusion is located inside the L-shaped connecting plate. The left side of the L-shaped connecting plate is provided with a locking component for locking the position of the connecting protrusion. The locking component automatically fixes the connecting protrusion by the elastic force of the spring to improve the disassembly and assembly efficiency.

[0015] Preferred, such as Figure 8As shown, the locking component includes a hollow column fixedly connected to the left side of the L-shaped connecting plate. The fixed connection can be achieved by adhesive bonding, welding, or bolting. The hollow column provides installation space for the pull rod and spring and restricts their movement direction. The pull rod is movably connected inside the hollow column. The locking component is unlocked by manually pulling the pull rod. The right end of the pull rod passes through the left side of the L-shaped connecting plate and is inserted into the positioning slot. After the pull rod is inserted into the positioning slot, it is kept locked by the elastic force of the spring.

[0016] The left end of the pull rod passes through the inner wall of the hollow column to the outside. A spring is fitted on the outer wall of the pull rod. The spring provides elastic pressure to make the pull rod automatically reset and maintain the locking function. The spring is located inside the hollow column. An annular slider is provided on the outer wall of the pull rod near the right end. The right end of the spring abuts against the left side of the annular slider, and the left end of the spring abuts against the left end of the inner wall of the hollow column. The annular slider transmits the elastic force of the spring.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This rotary sweeping road leaf cleaning equipment simplifies the operation process of replacing the sweeping brush roller through the linkage design of the upper and lower covers, locking parts and positioning grooves of the quick-release components. It can be fixed or disassembled simply by closing the upper and lower covers and pulling the locking parts, without disassembling the rotating shaft, which greatly shortens the maintenance time and improves the efficiency of equipment use.

[0019] 2. The rotary sweeping road leaf cleaning equipment uses a drive component with a rectangular sleeve block and a rectangular docking block plugging structure. The non-circular cross-section design avoids slippage during transmission, ensuring that the sweeping brush roller can still stably transmit power under high-load sweeping conditions, thus improving sweeping reliability.

[0020] 3. This rotary sweeping road leaf cleaning device features a spring and pull rod design for the locking mechanism, which enables automatic reset. The locking state is maintained by the spring force, and the device can be unlocked simply by pulling it manually without the need for additional tools. This significantly improves the convenience of maintenance and reduces the difficulty of manual operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a partial structural schematic diagram of the present invention;

[0023] Figure 3 This is a schematic diagram of the assembly structure of the drive component and the cleaning brush roller in this utility model;

[0024] Figure 4 This is a schematic diagram of the assembly structure of the quick-release component and the cleaning brush roller in this utility model.

[0025] Figure 5 This is a schematic diagram of the assembly structure of the second sealing bearing and the cleaning brush roller in this utility model;

[0026] Figure 6 This is a schematic diagram of the quick-release component structure in this utility model;

[0027] Figure 7 This is a schematic diagram of the upper cover structure in this utility model;

[0028] Figure 8 This is a partial structural diagram of the quick-release component in this utility model;

[0029] In the diagram: 100, Leaf cleaning device body; 200, Leaf suction hood; 300, Cleaning brush roller; 310, Rectangular connecting block; 320, Rotating shaft; 330, Connecting shaft; 400, Drive assembly; 410, First fixed side plate; 420, Motor; 430, Rectangular sleeve block; 440, First sealed bearing; 500, Quick release assembly; 510, Second fixed side plate; 511, First U-shaped seat; 512, Second U-shaped seat; 520, Top cover; 521, First positioning groove; 522, Connecting protrusion; 5221, Positioning slot; 530, Bottom cover; 531, Second positioning groove; 532, L-shaped connecting plate; 540, Locking element; 541, Hollow column; 542, Pull rod; 5421, Annular slider; 543, Spring; 600, Second sealed bearing. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Please see Figures 1-8 This utility model provides a technical solution:

[0033] A rotary sweeping road leaf cleaning device includes a leaf cleaning device body 100, which includes a collection box. The bottom of the collection box has a base plate with four wheels arranged in a matrix. A fan and push handle are located on the right side of the collection box, and a conveying pipe connected to a leaf suction hood 200 is located on the left side. The specific working principle of the leaf cleaning device body 100 is based on existing technology, such as the detailed working principle described in patent publication CN221589437U, which will not be repeated here. The leaf cleaning device body 100 includes a leaf suction hood 200, which guides the swept leaves to the collection box through negative pressure adsorption. Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a drive assembly 400 is provided on the front side of the leaf suction cover 200. The drive assembly 400 is used to drive the sweeping brush roller 300 to rotate. A quick-release assembly 500 is provided on the rear side of the leaf suction cover 200. The quick-release assembly 500 is used to realize the quick disassembly and installation of the sweeping brush roller 300. The sweeping brush roller 300 is provided between the drive assembly 400 and the quick-release assembly 500. The sweeping brush roller 300 directly contacts the road surface by rotating and sweeps fallen leaves to the leaf suction cover 200.

[0034] The drive assembly 400 includes a first fixed side plate 410 bolted to the front of the leaf suction hood 200. The first fixed side plate 410 is used to fix the motor 420 and provide a support structure. The motor 420 is mounted on the front of the first fixed side plate 410 via a mounting plate. The motor 420 outputs rotational driving force as a power source. It is powered by the power supply system of the leaf cleaning equipment body 100 and controlled by the control system. The output shaft of the motor 420 is coaxially connected to a rectangular sleeve block 430. The front end of the cleaning brush roller 300 is provided with a rectangular docking block 310 that is inserted into the rectangular sleeve block 430. The rectangular sleeve block 430 and the rectangular docking block 310 are inserted to realize power transmission. The rectangular docking block 310 is designed with a non-circular cross section to prevent the cleaning brush roller 300 from slipping with the drive assembly 400.

[0035] The quick-release assembly 500 includes a second fixed side plate 510 bolted to the rear side of the suction hood 200. The second fixed side plate 510 secures the upper cover 520 and lower cover 530 of the quick-release assembly 500. The upper cover 520 is rotatably connected to the top left side of the second fixed side plate 510 via a first U-shaped seat 511, which allows the upper cover 520 to rotate around an axis for opening and closing. The lower cover 530 is rotatably connected to the bottom left side of the second fixed side plate 510 via a second U-shaped seat 512, which allows the lower cover 530 to rotate around an axis and cooperates with the upper cover 520 to secure the second sealing bearing 600 and the cleaning brush roller 300. A rotating shaft 320 is provided in the middle of the rear end. The rotating shaft 320 serves as the rear end support structure of the cleaning brush roller 300. A connecting shaft 330 is integrally formed at the rear end of the rotating shaft 320. The outer diameter of the connecting shaft 330 is smaller than the outer diameter of the rotating shaft 320. The connecting shaft 330 is used to connect the second sealed bearing 600 and transmit rotational stability. The second sealed bearing 600 is sleeved on the outer wall of the connecting shaft 330. The second sealed bearing 600 reduces rotational resistance and prevents dust from entering the bearing. The second sealed bearing 600 is located between the lower cover 530 and the upper cover 520. After the lower cover 530 and the upper cover 520 are closed, the second sealed bearing 600 is clamped to limit its axial displacement.

[0036] When installing the cleaning brush roller 300, first insert the rectangular mating block 310 at the front end of the cleaning brush roller 300 into the rectangular sleeve block 430, then close the lower cover 530 and the upper cover 520, so that the second sealing bearing 600 is fixed in the first positioning groove 521 and the second positioning groove 531, and use the locking member 540 to fix the position of the connecting protrusion 522 and the L-shaped connecting plate 532.

[0037] In this embodiment, as Figure 3 As shown, the output shaft of the motor 420 is connected to the first fixed side plate 410 through the first sealed bearing 440, and the first sealed bearing 440 reduces the friction of the output shaft of the motor 420.

[0038] Specifically, such as Figure 4 As shown, the bottom of the upper cover 520 is provided with a first positioning groove 521, and the top of the lower cover 530 is provided with a second positioning groove 531. The outer ring of the second sealing bearing 600 is located between the first positioning groove 521 and the second positioning groove 531. The first positioning groove 521 and the second positioning groove 531 cooperate to clamp the outer ring of the second sealing bearing 600 to restrict its radial movement.

[0039] Furthermore, such as Figure 7 As shown, a connecting protrusion 522 is provided at the bottom left end of the top cover 520, and a positioning slot 5221 is provided on the left side of the connecting protrusion 522. The positioning slot 5221 cooperates with the pull rod 542 to realize the quick locking and unlocking of the locking member 540.

[0040] Furthermore, such as Figure 6 As shown, the top left end of the lower cover 530 is provided with an L-shaped connecting plate 532. The L-shaped connecting plate 532 provides an installation base for the locking member 540 and restricts the displacement of the connecting protrusion 522. When the lower cover 530 and the upper cover 520 are closed, the connecting protrusion 522 is located inside the L-shaped connecting plate 532. The left side of the L-shaped connecting plate 532 is provided with a locking member 540 for locking the position of the connecting protrusion 522. The locking member 540 automatically fixes the connecting protrusion 522 by the elastic force of the spring 543 to improve the efficiency of disassembly and assembly.

[0041] Furthermore, such as Figure 8 As shown, the locking component 540 includes a hollow column 541 fixedly connected to the left side of the L-shaped connecting plate 532. The fixed connection can be achieved by adhesive bonding, welding or bolt connection. The hollow column 541 provides installation space for the pull rod 542 and the spring 543 and restricts their movement direction. The pull rod 542 is movably connected inside the hollow column 541. The locking component 540 is unlocked by manually pulling the pull rod 542. The right end of the pull rod 542 passes through the left side of the L-shaped connecting plate 532 and is inserted into the positioning slot 5221. After the pull rod 542 is inserted into the positioning slot 5221, it is kept locked by the elastic force of the spring 543.

[0042] The left end of the pull rod 542 passes through the inner wall of the hollow column 541 to the outside. A spring 543 is fitted on the outer wall of the pull rod 542. The spring 543 provides elastic pressure to make the pull rod 542 automatically reset and maintain the locking function. The spring 543 is located inside the hollow column 541. An annular slider 5421 is provided on the outer wall of the pull rod 542 near the right end. The right end of the spring 543 abuts against the left side of the annular slider 5421, and the left end of the spring 543 abuts against the left end of the inner wall of the hollow column 541. The annular slider 5421 transmits the elastic force of the spring 543.

[0043] In this embodiment, the rotary sweeping road leaf cleaning device is used by the operator pushing the main body 100 of the leaf cleaning device through the push handle. Four wheels provide support and propulsion. After starting the fan and motor 420, the motor 420 drives the rectangular connecting block 310 and the sweeping brush roller 300 to rotate via the rectangular sleeve block 430. The sweeping brush roller 300 directly contacts the road surface and sweeps up fallen leaves. The leaves are then adsorbed by the negative pressure of the leaf suction hood 200 and enter the collection box through the conveying pipe. When the worn sweeping brush roller 300 needs to be replaced, the operator manually pulls the lever 542 of the locking component 540 to compress the spring 543, causing the lever 542 to disengage from the positioning slot 5221 of the connecting protrusion 522. Then, the upper cover 520 and lower cover 530 of the quick-release assembly 500 are opened. Release the clamp on the second sealed bearing 600; pull the rectangular mating block 310 at the front end of the cleaning brush roller 300 out of the rectangular sleeve block 430 of the drive assembly 400 to remove the cleaning brush roller 300; when installing a new cleaning brush roller 300, align the rectangular mating block 310 with the rectangular sleeve block 430 and insert it, close the upper cover 520 and the lower cover 530, so that the outer ring of the second sealed bearing 600 is positioned by the first positioning groove 521 and the second positioning groove 531, and at the same time, the connecting protrusion 522 moves to the inside of the L-shaped connecting plate 532; after releasing the pull rod 542, the spring 543 pushes the annular slider 5421 to make the pull rod 542 automatically insert into the positioning slot 5221 to complete the locking, ensuring that the cleaning brush roller 300 operates stably under the support of the rotating shaft 320 and the connecting shaft 330.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rotary sweeping road leaf cleaning device, comprising a leaf cleaning device body (100), wherein the leaf cleaning device body (100) includes a leaf suction hood (200), characterized in that: The front side of the suction hood (200) is provided with a drive assembly (400), and the rear side of the suction hood (200) is provided with a quick-release assembly (500). A cleaning brush roller (300) is provided between the drive assembly (400) and the quick-release assembly (500). The drive assembly (400) includes a first fixed side plate (410) that is bolted to the front side of the suction hood (200). A motor (420) is provided on the front side of the first fixed side plate (410) via a mounting plate. A rectangular sleeve block (430) is coaxially connected to the output shaft of the motor (420). A rectangular mating block (310) that inserts into the rectangular sleeve block (430) is provided at the middle of the front end of the cleaning brush roller (300). The quick-release assembly... (500) includes a second fixed side plate (510) bolted to the rear side of the suction hood (200). The top left side of the second fixed side plate (510) is rotatably connected to an upper cover (520) via a first U-shaped seat (511). The bottom left side of the second fixed side plate (510) is rotatably connected to a lower cover (530) via a second U-shaped seat (512). A rotating shaft (320) is provided in the middle of the rear end of the cleaning brush roller (300). A connecting shaft (330) is integrally formed at the rear end of the rotating shaft (320). A second sealed bearing (600) is sleeved on the outer wall of the connecting shaft (330). The second sealed bearing (600) is located between the lower cover (530) and the upper cover (520).

2. The rotary sweeping road leaf cleaning device according to claim 1, characterized in that: The output shaft of the motor (420) is connected to the first fixed side plate (410) through the first sealed bearing (440).

3. The rotary sweeping road leaf cleaning device according to claim 1, characterized in that: The bottom of the upper cover (520) is provided with a first positioning groove (521), and the top of the lower cover (530) is provided with a second positioning groove (531). The outer ring of the second sealing bearing (600) is located between the first positioning groove (521) and the second positioning groove (531).

4. The rotary sweeping road leaf cleaning device according to claim 1, characterized in that: The bottom left end of the top cover (520) is provided with a connecting protrusion (522), and a positioning slot (5221) is provided on the left side of the connecting protrusion (522).

5. The rotary sweeping road leaf cleaning device according to claim 4, characterized in that: The lower cover (530) has an L-shaped connecting plate (532) at the top left end. When the lower cover (530) and the upper cover (520) are closed, the connecting protrusion (522) is located inside the L-shaped connecting plate (532). The left side of the L-shaped connecting plate (532) has a locking member (540) for locking the position of the connecting protrusion (522).

6. The rotary sweeping road leaf cleaning device according to claim 5, characterized in that: The locking component (540) includes a hollow column (541) fixedly connected to the left side of the L-shaped connecting plate (532). A pull rod (542) is movably connected inside the hollow column (541). The right end of the pull rod (542) passes through the left side of the L-shaped connecting plate (532) and is inserted into the positioning slot (5221).

7. The rotary sweeping road leaf cleaning device according to claim 6, characterized in that: The left end of the pull rod (542) passes through the inner wall of the hollow column (541) to the outside. A spring (543) is sleeved on the outer wall of the pull rod (542). The spring (543) is located inside the hollow column (541). An annular slider (5421) is provided on the outer wall of the pull rod (542) near the right end. The right end of the spring (543) abuts against the left side of the annular slider (5421), and the left end of the spring (543) abuts against the left end of the inner wall of the hollow column (541).

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