Special lifting cage for cleaning large equipment in port

Abstract

The invention belongs to the technical field of port large equipment cleaning, and particularly discloses a special lifting cage for port large equipment cleaning, which comprises a bottom plate, the upper end of the bottom plate is connected with a connecting frame, the upper end of the connecting frame is connected with a top frame, and the two sides of the upper end of the top frame are uniformly connected with lifting hook bodies; folding platforms are evenly and rotatably connected to the two sides of the upper end of the bottom plate, protective fences are connected to the positions, corresponding to the two sides of the connecting frame, of the upper end of the bottom plate, and the cross section of each protective fence is of a C-shaped structure. Flexible contact between the suspension cage and equipment is achieved through the supporting mechanism so that rigid damage can be avoided, and the effect of guaranteeing the safety of high-altitude operation personnel is achieved.

Description

Technical Field

[0001] This invention belongs to the field of port large equipment cleaning technology, and specifically relates to a special cage for cleaning port large equipment. Background Technology

[0002] Large port loading and unloading equipment, such as quay cranes and yard cranes, are exposed to harsh marine industrial environments with high salt spray and high dust levels for extended periods. This makes them highly susceptible to accumulating salt, oil, and dust. These deposits not only severely impact the port's image but also accelerate the corrosion of the steel structure surface, posing a serious threat to the structural safety and service life of the equipment. To ensure equipment safety, prevent structural damage, extend service life, and maintain the port's professional image, regular and thorough high-altitude cleaning of the columns, beams, and other exterior surfaces of these large pieces of equipment has become an indispensable maintenance procedure.

[0003] Currently, traditional methods for high-altitude cleaning operations often employ cranes with high-altitude seating platforms or simple suspended baskets. These methods have significant drawbacks. First, they are extremely inefficient, limiting the movement of personnel and tools, requiring frequent crane repositioning, and resulting in small coverage areas per operation. Second, when personnel are suspended in mid-air, there is no stable platform or effective collision protection, making them susceptible to wind and swaying, and posing a risk of overlapping with ground operations. Third, they are uneconomical, with high costs associated with renting large cranes. Crucially, existing suspended baskets or cages generally lack stability when performing detailed cleaning close to equipment columns, as the connection between the lifting equipment and the basket is typically... The use of flexible steel wire ropes for connection, coupled with the lack of an effective lateral positioning mechanism between the suspended platform and the cleaning surface, makes it prone to slight displacement and slow, trend-like swaying relative to the support column under the influence of wind, personnel movement, or minor crane movements. This instability makes it difficult for workers to continuously and accurately apply force to clean specific areas, affecting the quality and efficiency of the work. Furthermore, it inevitably causes intermittent rigid collisions and friction between the metal structural components of the suspended platform and the equipment surface, generating noise and even scratching or wearing through the expensive protective paint layer of the equipment, forming new corrosion points. This essentially violates the original intention of cleaning and maintenance. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a special cleaning cage for large port equipment.

[0005] To achieve the above objectives, the present invention provides a special cleaning cage for large port equipment, comprising a base plate, a connecting frame connected to the upper end of the base plate, a top frame connected to the upper end of the connecting frame, hook bodies evenly connected to both sides of the upper end of the top frame, folding platforms evenly rotatably connected to both sides of the upper end of the base plate, guardrails connected to both sides of the upper end of the base plate corresponding to the connecting frame, the guardrails having a C-shaped cross-section, safety seats evenly connected to both sides of the upper end of the base plate, connecting blocks connected to both sides of the lower end of the top frame, anti-fall wire ropes connected between two connecting blocks, locking mechanisms evenly connected to both sides of the lower end of the base plate, and six sets of fixing grooves evenly opened on both sides of the base plate; Supporting mechanisms are connected to both sides of the base plate. Two supporting mechanisms are installed on both sides of the base plate. Each supporting mechanism includes a fixing plate. There are three fixing plates. The three fixing plates are snapped into the corresponding fixing grooves. Buffering mechanisms are connected to the upper and lower parts of one side of each fixing plate. Buffering plates are connected to one side of each of the three buffering mechanisms and the other three buffering mechanisms. Support rollers are evenly rotatably connected to one side of each of the two buffering plates.

[0006] In the above technical solution, the positioning mechanism further includes a support base, and the number of the support bases is four sets. Two of the support bases are connected to a drive motor in the middle of one side. The output ends of the two drive motors are connected to lead screws. One end of each of the two lead screws extends through to one side of the corresponding two support bases and is connected to one side of the other two support bases. The outer wall of the two lead screws is threaded with a sliding plate, and the sliding plate slides below the base plate.

[0007] In the above technical solution, further, a fixed block is connected to the middle of both sides of the skateboard, and an opening is opened in the middle of one side of the two fixed blocks. A dual-axis electric telescopic rod is embedded in the two openings. A moving block is connected to both ends of the two dual-axis electric telescopic rods. A C-shaped plate is connected to one end of the multiple moving blocks. A clamping roller is rotatably connected to the inner wall of the C-shaped plate.

[0008] In the above technical solution, further, both sides of the upper end of the skateboard are connected to stabilizing blocks, and the lower end of the base plate is provided with stabilizing grooves corresponding to the two stabilizing blocks. The two stabilizing blocks slide inside the two stabilizing grooves respectively, and the shapes of the stabilizing blocks and stabilizing grooves are all inverted convex structures.

[0009] In the above technical solution, the buffer mechanism further includes a rotating plate. One end of the rotating plate is rotatably connected to one side of the fixed plate via a first rotating block, and the other end of the rotating plate is rotatably connected to one side of the buffer plate via a second rotating block. A stabilizing plate is rotatably connected to the middle of one side of the rotating plate via a rotating seat. A mounting seat is rotatably connected to one end of the stabilizing plate. The mounting seat has a C-shaped cross-section. One side of the mounting seat slides on the side of the fixed plate. Sliding rods are connected to both sides of the mounting seat on one side of the fixed plate. Buffer blocks are connected to the middle of both sides of the mounting seat.

[0010] In the above technical solution, the upper and lower ends of the two slide rods are connected to one side of the fixing plate through the mounting block, and the two buffer blocks are provided with through holes corresponding to the two slide rods, with the two slide rods located inside the two through holes respectively.

[0011] In the above technical solution, the two buffer blocks slide on the outer walls of the two slide rods respectively. Buffer springs are sleeved on the upper and lower parts of the outer walls of the two slide rods. One end of the multiple buffer springs is connected to one side of the mounting block, and the other end of the multiple buffer springs is connected to the upper and lower ends of the two buffer blocks respectively.

[0012] Compared with the prior art, the present invention has the following beneficial effects: By setting up support and buffer mechanisms, the cage and equipment achieve flexible contact. When the cage approaches the equipment, the support rollers first bear the contact force, which is then transmitted to the buffer block through the rotating plate and stabilizing plate. This pushes the buffer spring to compress and converts the collision kinetic energy into elastic potential energy, fundamentally avoiding rigid collisions between the cage's metal frame and the equipment's paint surface. This reduces the cost of repairing the equipment's paint surface, and the buffering process requires no manual intervention. After the force weakens, the buffer spring can automatically reset, which reduces the structural stress caused by the impact, extends the service life of the cage, eliminates metal impact noise, and improves the comfort of operation.

[0013] Through the positioning mechanism, the drive motor drives the lead screw to move the sliding plate. In conjunction with the dual-axis electric telescopic rod, the spacing of the clamping rollers can be flexibly adjusted, so that the clamping rollers and the opposite support rollers form an adaptive flexible clamping of the equipment column. The clamping force can be precisely controlled, completely eliminating the swaying of the cage caused by high-altitude wind loads and personnel movement, allowing operators to focus on cleaning operations and significantly improving cleaning accuracy and quality. At the same time, the dual-axis electric telescopic rod can be adapted to columns of different specifications, eliminating the need for customized cages, and can also transform the cage from passive suspension to active rigid support, improving the safety of operators inside the cage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the device proposed in this invention; Figure 2 This is a schematic diagram of the structure for opening the fixing groove proposed in this invention; Figure 3 This is a schematic diagram of the installation structure of the safety seat proposed in this invention; Figure 4 This is a schematic diagram of the connection structure between the C-shaped plate and the clamping roller proposed in this invention; Figure 5 This is a schematic diagram of the connection structure between the buffer mechanism, buffer plate and support roller proposed in this invention; Figure 6 This is a schematic diagram of the connection structure between the buffer block and the buffer spring proposed in this invention; Figure 7 This is a schematic diagram of the installation structure of the stabilizing plate and mounting base proposed in this invention.

[0015] In the diagram: 1. Base plate; 2. Connecting frame; 3. Top frame; 4. Hook body; 5. Folding platform; 6. Guardrail; 7. Safety seat; 8. Connecting block; 9. Anti-fall wire rope; 10. Support seat; 11. Drive motor; 12. Lead screw; 13. Slide plate; 14. Stabilizing block; 15. Stabilizing groove; 16. Fixing block; 17. Dual-axis electric telescopic rod; 18. Moving block; 19. C-shaped plate; 20. Picking roller; 21. Fixing groove; 22. Fixing plate; 23. Rotating plate; 24. Stabilizing plate; 25. Mounting seat; 26. Slide rod; 27. Buffer block; 28. Buffer spring; 29. ​​Buffer plate; 30. Support roller. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] like Figures 1-7 The illustrated hoist cage for cleaning large port equipment includes a base plate 1, a connecting frame 2 connected to the upper end of the base plate 1, a top frame 3 connected to the upper end of the connecting frame 2, hook bodies 4 evenly connected to both sides of the upper end of the top frame 3, folding platforms 5 evenly rotatably connected to both sides of the upper end of the base plate 1, guardrails 6 connected to both sides of the upper end of the base plate 1 corresponding to the connecting frame 2, the guardrails 6 having a C-shaped cross-section, safety seats 7 evenly connected to both sides of the upper end of the base plate 1, connecting blocks 8 connected to both sides of the lower end of the top frame 3, and anti-fall steel wire ropes 9 connected between the two connecting blocks 8. The base plate 1 is uniformly connected with a locking mechanism. The base plate 1 has six sets of fixing slots 21 evenly opened on both sides. The base plate 1 is connected to a support mechanism on both sides. Two support mechanisms are installed on both sides of the base plate 1. The support mechanism includes a fixing plate 22. There are three fixing plates 22. The three fixing plates 22 are snapped into the corresponding fixing slots 21. The upper and lower parts of one side of the fixing plate 22 are connected to a buffer mechanism. The three buffer mechanisms are connected to a buffer plate 29 on one side and the other three buffer mechanisms on the other side. The two buffer plates 29 are evenly rotatably connected to a support roller 30 on one side. The base plate 1 can support the weight of workers, cleaning tools, and various components. The connecting frame 2 enhances the overall structural rigidity of the cage. The hook body 4, installed on top of the top frame 3, provides the installation foundation for lifting the cage. The hook body 4 enables the lifting, transfer, and height adjustment of the entire cage. The folding platform 5 can be rotated outwards when cleaning the side of the quay crane column, increasing the operating area for workers and adapting to cleaning needs at different column heights. The C-shaped guardrail 6 prevents workers from leaning out of the cage or cleaning tools from accidentally slipping while working at height. The safety seat 7 can be used to protect workers during the lifting and lowering of the cage. During the process or work breaks, workers can ride in the cage to avoid falling due to instability. Workers can attach their safety belts to the fall arrest wire rope 9 to prevent falls caused by slight shaking of the cage during lifting, lowering, or operation. The fixing groove 21 can be used to attach the fixing plate 22 to ensure that the support mechanism is stably installed on both sides of the base plate 1. The fixing plate 22 can be used to fix the buffer mechanism. The support roller 30 can be used to make contact with the column surface first when the cage approaches the column. By rotating, it reduces the direct friction between the cage and the column, and at the same time, it works with the buffer mechanism to achieve flexible contact. The outer surface of the support roller 30 is made of silicone material.

[0018] like Figures 3-4 As shown: The locking mechanism includes four sets of support seats 10. Two support seats 10 are connected to a drive motor 11 at the center of one side. Each drive motor 11 has a lead screw 12 connected to its output end. One end of each lead screw 12 extends through to one side of the corresponding two support seats 10 and connects to one side of the other two support seats 10. A sliding plate 13 is threaded to the center of the outer wall of each lead screw 12. The sliding plate 13 slides below the base plate 1. Fixing blocks 16 are connected to the center of both sides of the sliding plate 13. Two fixing blocks 16 are connected to the center of one side of each fixing block 16. The part has an opening, and a double-axis electric telescopic rod 17 is embedded in the two openings. The two ends of the two double-axis electric telescopic rods 17 are connected to moving blocks 18. One end of the multiple moving blocks 18 is connected to a C-shaped plate 19. The inner wall of the C-shaped plate 19 is rotatably connected to a clamping roller 20. The upper end of the slide plate 13 is connected to both sides of the stabilizing block 14. The lower end of the bottom plate 1 is provided with a stabilizing groove 15 corresponding to the two stabilizing blocks 14. The two stabilizing blocks 14 slide inside the two stabilizing grooves 15 respectively. The stabilizing blocks 14 and the stabilizing grooves 15 are both set with an inverted convex structure. The support base 10 provides a stable mounting foundation for the clamping mechanism. The drive motor 11 drives the lead screw 12 to rotate synchronously, driving the slide plate 13 to move closer to or away from the quay crane column, thereby adjusting the clamping position. The slide plate 13 moves the entire clamping assembly to the preset clamping position. The stabilizing block 14 and the inverted convex stabilizing groove 15 can be used to restrict the movement direction of the slide plate 13, preventing the slide plate 13 from shifting up and down or wobbling during sliding, ensuring smooth movement. The dual-axis electric telescopic rod 17 can adjust the two C-shaped plates 19 and the clamping roller 20. The spacing between the columns is adapted to accommodate quay crane columns of different widths. The movable block 18 can connect the dual-axis electric telescopic rod 17 and the C-shaped plate 19 to transmit the telescopic rod's extension and retraction power. The C-shaped plate 19 can be used to install the clamping roller 20, providing stable rotational support for the clamping roller 20 and preventing it from falling off. The clamping roller 20 contacts the side of the column and reduces friction with the column through its own rotation. Together with the support roller 30, it forms a clamping force from both sides of the column to prevent the cage from shaking during operation. The clamping roller 20 is made of silicone material to avoid scratching the column.

[0019] like Figures 5-7 As shown: The buffer mechanism includes a rotating plate 23. One end of the rotating plate 23 is rotatably connected to one side of the fixed plate 22 via a first rotating block, and the other end of the rotating plate 23 is rotatably connected to one side of the buffer plate 29 via a second rotating block. A stabilizing plate 24 is rotatably connected to the middle of one side of the rotating plate 23 via a rotating seat. A mounting base 25 is rotatably connected to one end of the stabilizing plate 24. The mounting base 25 has a C-shaped cross-section. One side of the mounting base 25 slides on the side of the fixed plate 22. Sliding rods 26 are connected to both sides of the mounting base 25 on the side of the fixed plate 22 corresponding to both sides of the mounting base 25. Buffer blocks 27 are connected to the middle of both sides of 25. The upper and lower ends of the two slide rods 26 are connected to one side of the fixed plate 22 through the mounting block. The two buffer blocks 27 are provided with through holes corresponding to the two slide rods 26. The two slide rods 26 are located inside the two through holes respectively. The two buffer blocks 27 slide on the outer wall of the two slide rods 26 respectively. Buffer springs 28 are sleeved on the upper and lower parts of the outer wall of the two slide rods 26. One end of the multiple buffer springs 28 is connected to one side of the mounting block. The other end of the multiple buffer springs 28 is connected to the upper and lower ends of the two buffer blocks 27 respectively. The rotating plate 23, through the first and second rotating blocks at both ends, converts the impact force on the buffer plate 29 into its own rotation. The first rotating block enables flexible rotational connection between the rotating plate 23 and the fixed plate 22, reducing rotational resistance. The second rotating block enables rotational connection between the rotating plate 23 and the buffer plate 29, ensuring that the rotating plate 23 can respond synchronously when the buffer plate 29 is subjected to force. The stabilizing plate 24 connects the rotating plate 23 and the mounting base 25, converting the rotation of the rotating plate 23 into linear sliding of the mounting base 25, thus realizing the conversion of force direction. The mounting base 25 can drive the buffer blocks 27 on both sides along the sliding rod 2. 6. The movement transmits the impact force to the buffer spring 28. The slide rod 26 can provide a sliding guide for the buffer block 27, ensuring that the buffer block 27 moves smoothly and avoiding deviation that could lead to buffer failure. The buffer block 27 can compress or stretch the buffer spring 28 under the drive of the mounting base 25, converting the impact force into the elastic potential energy of the spring and providing stable support for the buffer system. The buffer spring 28 can absorb the impact energy through its own compression deformation, achieving flexible contact between the cage and the column, avoiding rigid impact that could scratch the paint surface of the column. At the same time, after the impact force weakens, it releases potential energy to push the mechanism to reset, continuously responding to minor forces during operation.

[0020] Working principle: When using the device, the port spreader lifts the entire cage to the target working height by connecting the hook body 4. During the lifting and lowering process, the operator sits on the safety seat 7 and attaches the safety belt hook to the anti-fall wire rope 9. The operator controls the spreader to bring the entire cage close to the quay crane column. During this process, the support rollers 30 installed on both sides of the cage first contact the surface of the column. When the cage approaches the equipment column, the support roller 30 on the buffer plate 29 first contacts it and is subjected to pressure, pushing the rotating plate 23 to rotate around the hinge point between it and the fixed plate 22. The rotation of the rotating plate 23 is converted into a linear thrust on the mounting base 25 through the central stabilizing plate 24, forcing the mounting base 25 to slide outward along the fixed plate 22 and driving the buffer blocks 27 on both sides to compress the buffer spring 28 along the slide rod 26, thereby converting the impact kinetic energy into the elastic potential energy of the spring for absorption. When the impact force weakens or disappears, the buffer spring 28 releases its potential energy, pushing the entire mechanism to move in the opposite direction, causing the support roller 30 to reset, thereby achieving flexible contact, continuous buffering and automatic reset, avoiding rigid impact and scratching between the steel structure of the cage and the painted surface of the column.

[0021] Once the cage is roughly in place, activate the locking mechanism to achieve precision and stability. Start the two drive motors 11 to drive the two lead screws 12 to rotate synchronously. The slide plate 13, which is threaded to the lead screws 12, moves laterally below the base plate 1 under the drive of the lead screws 12. Through the inverted convex sliding cooperation between the stabilizing block 14 and the stabilizing groove 15, ensure that the slide plate 13 moves smoothly without shaking. Move the slide plate 13 to the side close to the column. After the slide plate 13 drives the dual-axis electric telescopic rod 17 on it to move to the predetermined position, activate the dual-axis electric telescopic rod 17 to drive the moving blocks 18 at both ends to move synchronously in opposite directions, thereby adjusting the distance between the two C-shaped plates 19 and the clamping rollers 20 on them.

[0022] Finally, the clamping roller 20 contacts one side of the equipment column and works in conjunction with the support roller 30 on the other side to flexibly clamp the column from both sides, so that the cage changes from a suspended state to a stable supported state, completely eliminating the shaking during operation.

[0023] By flattening the folding platforms 5 on both sides of the hoist cage and extending them outward, the working space for operators can be increased. Operators can stand on the extended platform and use its stability to clean the sides of the equipment columns efficiently and without dead angles. For parts that are difficult to reach from the top, such as the quay crane connecting beam, operators can stand on the base plate 1 and use long-handled cleaning tools such as telescopic rods to work upward through the top opening designed on the top frame 3, which is safe and convenient.

[0024] Throughout the operation, due to wind or slight movement of the lifting gear, there may be continuous small interaction forces between the cage and the equipment. At this time, the buffer mechanism continues to play its role. Any force acting on the buffer plate 29 and the support roller 30 will be transmitted to the mounting base 25 through the rotating plate 23 and the stabilizing plate 24, forcing the buffer block 27 to slide along the slide rod 26 and compress the buffer spring 28. The damping effect of the spring continuously absorbs energy, ensuring that the cage and the column always maintain a flexible contact state, which not only ensures stability but also perfectly protects the surface of the equipment.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A special cleaning cage for large port equipment, comprising a base plate (1), characterized in that, The upper end of the base plate (1) is connected to a connecting frame (2), the upper end of the connecting frame (2) is connected to a top frame (3), the upper ends of the top frame (3) are evenly connected to hook bodies (4), the upper ends of the base plate (1) are evenly rotatably connected to folding platforms (5), the upper ends of the base plate (1) are connected to guardrails (6) on both sides of the connecting frame (2), the cross-section of the guardrails (6) is C-shaped, the upper ends of the base plate (1) are evenly connected to safety seats (7), the lower ends of the top frame (3) are connected to connecting blocks (8), the two connecting blocks (8) are connected to a fall-prevention steel wire rope (9), the lower ends of the base plate (1) are evenly connected to a locking mechanism, the lower ends of the base plate (1) are evenly provided with fixing grooves (21), the number of fixing grooves (21) is six sets; The base plate (1) is connected to support mechanisms on both sides. The two support mechanisms are installed on both sides of the base plate (1). The support mechanism includes a fixing plate (22). There are three fixing plates (22). The three fixing plates (22) are snapped into the corresponding fixing grooves (21). The upper and lower parts of one side of the fixing plate (22) are connected to buffer mechanisms. One side of the three buffer mechanisms and one side of the other three buffer mechanisms are connected to buffer plates (29). The two buffer plates (29) are connected to support rollers (30) evenly rotated on one side.

2. The special cleaning cage for large port equipment according to claim 1, characterized in that, The positioning mechanism includes a support base (10), and there are four sets of support bases (10). Two of the support bases (10) are connected to a drive motor (11) in the middle of one side. The output ends of the two drive motors (11) are connected to lead screws (12). One end of the two lead screws (12) extends through to one side of the corresponding two support bases (10) and is connected to one side of the other two support bases (10). The outer wall of the two lead screws (12) is threaded with a sliding plate (13). The sliding plate (13) slides below the base plate (1).

3. The special cleaning cage for large port equipment according to claim 2, characterized in that, The two sides of the slide plate (13) are connected to the middle of the fixed blocks (16). The two fixed blocks (16) have openings in the middle of one side. The two openings are each fitted with a dual-axis electric telescopic rod (17). The two dual-axis electric telescopic rods (17) are connected to the two ends of the moving blocks (18). The multiple moving blocks (18) are connected to a C-shaped plate (19) at one end. The inner wall of the C-shaped plate (19) is rotatably connected to a clamping roller (20).

4. The special cleaning cage for large port equipment according to claim 2, characterized in that, The upper sides of the slide plate (13) are connected to stabilizing blocks (14), and the lower end of the base plate (1) is provided with stabilizing grooves (15) corresponding to the two stabilizing blocks (14). The two stabilizing blocks (14) slide inside the two stabilizing grooves (15) respectively. The shapes of the stabilizing blocks (14) and the stabilizing grooves (15) are both inverted convex structures.

5. A special cleaning cage for large port equipment according to claim 1, characterized in that, The buffer mechanism includes a rotating plate (23), one end of which is rotatably connected to one side of a fixed plate (22) via a first rotating block, and the other end of which is rotatably connected to one side of a buffer plate (29) via a second rotating block. A stabilizing plate (24) is rotatably connected to the middle of one side of the rotating plate (23) via a rotating seat. A mounting seat (25) is rotatably connected to one end of the stabilizing plate (24). The mounting seat (25) has a C-shaped cross-section. One side of the mounting seat (25) slides on one side of the fixed plate (22). A sliding rod (26) is connected to both sides of the mounting seat (25) on one side of the fixed plate (22). A buffer block (27) is connected to the middle of both sides of the mounting seat (25).

6. A special cleaning cage for large port equipment according to claim 5, characterized in that, The upper and lower ends of the two slide rods (26) are connected to one side of the fixing plate (22) through the mounting block. The two buffer blocks (27) are provided with through holes corresponding to the two slide rods (26), and the two slide rods (26) are respectively located inside the two through holes.

7. A special cleaning cage for large port equipment according to claim 5, characterized in that, The two buffer blocks (27) slide on the outer walls of the two slide rods (26), and buffer springs (28) are sleeved on the upper and lower parts of the outer walls of the two slide rods (26). One end of the multiple buffer springs (28) is connected to one side of the mounting block, and the other end of the multiple buffer springs (28) is connected to the upper and lower ends of the two buffer blocks (27) respectively.

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