Novel electric lifting turnover machine suitable for AGV butt joint

Abstract

The invention relates to a novel electric lifting turnover machine suitable for AGV butt joint, and belongs to the field of mechanical structures. The electric lifting turnover machine comprises a hopper (1) and an electric lifting turnover machine body (2). And the electric lifting turnover machine (2) carries the hopper (1) to lift and turn over, so that materials in the hopper (1) are poured into appointed equipment, and then the equipment returns to the original position. According to the method, high-efficiency operation is guaranteed, meanwhile, safety, stability and flexible adaptation capacity are considered, and the method is particularly suitable for scenes of cooperative operation with AGVs in intelligent logistics and automatic production lines. The whole machine is high in integration level, accurate in control and stable in operation, has safety and flexible adaptation capacity, effectively replaces a traditional manual intervention or semi-automatic unloading mode, remarkably improves logistics efficiency and production line cooperation level, and is suitable for multi-scene requirements of intelligent manufacturing, warehouse logistics and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of mechanical structures, and particularly relates to a novel electric lifting and overturning machine suitable for butt joint of AGV trolleys. BACKGROUND

[0002] There are mainly two types of conventional lifting and overturning machines: one is a traditional hydraulic or pneumatic driven lifting and overturning device, which provides power through a hydraulic cylinder or a pneumatic cylinder to realize lifting and overturning actions. Although this type of equipment has certain carrying capacity, it has problems such as high energy consumption, easy oil leakage pollution, complex maintenance, slow response, unstable performance in low temperature environment, etc., and is difficult to meet the requirements of modern intelligent manufacturing for cleanliness, precision and reliability. The other is an early electromechanical combined electric overturning machine, which usually adopts two independent motors to drive the lifting mechanism (such as chain or steel wire rope) and the overturning mechanism (such as worm gear or rotary reducer) respectively, and realizes sequential control through limit switch and PLC. Although this scheme improves the automation level, it still has disadvantages such as complex structure, large space occupation, high cost, difficulty in synchronous coordination, etc., and lacks effective buffer for impact vibration, affecting the long-term operation stability. At present, the electric lifting and overturning machines on the market still have many deficiencies in actual application. First, some of the equipment still adopts hydraulic drive mode, which can provide larger thrust, but its stroke is generally shorter, which is difficult to meet the demand of high stroke operation, and the hydraulic system structure is complex, easy to leak oil, with high daily maintenance cost and inconvenient operation. Second, although some models using pure electric drive are environmentally friendly and energy-saving, they generally have limited carrying capacity, and the transmission mechanism (such as chain, gear, etc.) is designed to be exposed, which not only affects the overall appearance, but also has safety hazards, easily causing personnel injury or foreign matter entrapment. In addition, the lifting stroke of most equipment is a fixed value, which cannot be flexibly adjusted according to the actual working conditions, limiting its application range. In terms of running performance, the existing products usually do not have speed regulation function, and the acceleration and deceleration in the starting and stopping process is abrupt, resulting in obvious impact when starting and reaching the destination, producing large noise and affecting the working environment. More importantly, most of the current electric lifting and overturning machines lack standardized docking interfaces or cooperative control logic with latent jacking type AGV trolleys, which are difficult to integrate into intelligent logistics systems, restricting their integrated application in flexible automatic production lines.

[0003] Compared with the prior art, the application integrates electric drive, single motor double action linkage, built-in transmission chain, hydraulic damping buffer and multi-hole adjustable connection structure, etc. innovative design, while ensuring the action precision and running stability, significantly simplifies the mechanical structure, enhances the equipment compatibility and safety, and better fits the current trend of green, intelligent and modularization of industrial automation. SUMMARY (I) Technical problems to be solved The technical problem to be solved by the present application is how to provide a new electric lifting turnover machine suitable for AGV trolley docking to solve the problems existing in the current market electric lifting turnover machine.

[0004] (II) Technical solutions To solve the above technical problems, the present application provides a new electric lifting turnover machine suitable for AGV trolley docking, the electric lifting turnover machine (2) comprises: a fixed frame assembly (3), a docking frame assembly (4), a transmission device assembly (5), an upper limit hydraulic damper (6), a safety protection (7) and a lower limit hydraulic damper (8); the fixed frame assembly (3) is used to provide an overall support frame, the docking frame assembly (4) is used to connect the hopper (1), the transmission device assembly (5) is located at the bottom outside of the fixed frame assembly (3) and is used to drive the docking frame assembly (4) to move up and down and turn along the fixed frame assembly (3), the upper limit hydraulic damper (6) and the lower limit hydraulic damper (8) are used to limit the docking frame assembly (4), and the safety protection (7) is used to provide protection. When working, the electric lifting turnover machine (2) carries the hopper (1) to lift and turn, pours the material in the hopper (1) into a designated device, and then returns to the original position; the overall working process is as follows: the AGV trolley carries the full material hopper (1) to the electric lifting turnover machine (2) station, the AGV trolley places the full material hopper (1) on the docking frame, the AGV trolley leaves, the electric lifting turnover machine (2) senses the hopper (1) through the photoelectric sensor, the electric lifting turnover machine (2) lifts the hopper (1) to a specified position height, the material in the hopper (1) is poured out, the frequency conversion motor drives the chain to rotate until the hopper (1) returns to the original position.

[0005] (III) Beneficial effects This invention proposes a novel electric lifting and tilting machine suitable for AGV (Automated Guided Vehicle) docking. Through multiple structural and control innovations, this invention significantly improves the stability, safety, and compatibility of the equipment. Firstly, the machine employs a dual-rail guide structure, coupled with a single-motor drive system, cleverly achieving synchronous lifting and tilting of the hopper. This simplifies the transmission system, reduces energy consumption, and ensures smooth and reliable operation, effectively avoiding the swaying or uneven loading problems common in traditional single-rail structures. Secondly, the transmission chain is completely integrated within the guide rails, resulting in a sleek and aesthetically pleasing appearance and significantly improved operational safety, preventing accidental contact with moving parts. Furthermore, a hydraulic damper is integrated at the end of the guide rails, effectively absorbing impact vibrations generated during start-up, shutdown, and reaching extreme positions. This significantly improves the stability of the system operation, protects the material inside the hopper from disturbance, and avoids the risk of mechanical damage or motor burnout due to sudden overload. Finally, the frame and connecting frame employ an adjustable bolt and multi-hole adjustable structure design, which can flexibly adapt to loading and unloading stations of different heights and various hopper sizes, greatly enhancing the equipment's versatility and deployment efficiency in different production line environments. In summary, this invention ensures efficient operation while also considering safety, stability, and flexible adaptability, making it particularly suitable for scenarios involving collaborative operation with AGVs in intelligent logistics and automated production lines. Attached Figure Description

[0006] Figure 1 This is an overall schematic diagram of the present invention; Figure 2 Schematic diagram of an electrically operated lifting and tilting frame; Figure 3 This is a schematic diagram of the fixed rack assembly; Figure 4 This is a schematic diagram of the pad. Figure 5 Schematic diagram of height adjustment bolt; Figure 6 Schematic diagram of damper mounting base; Figure 7 This is a schematic diagram of the transmission device components; Figure 8 This is a schematic diagram of the connecting frame assembly; Figure 9 This is a schematic diagram of a hydraulic damper. Detailed Implementation

[0007] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0008] This invention relates to an electric lifting and tilting machine, belonging to the technical field of automated material handling equipment. It is mainly used in logistics, manufacturing, and other industries to achieve a standardized operation of "first vertically lifting, then tilting at an angle" for material boxes, thereby completing automatic unloading, transfer, or docking processes. This equipment integrates lifting and tilting functions, offering advantages such as high efficiency, safety, environmental friendliness, and flexible adaptability. It is suitable for collaborative operation with AGVs or intelligent production lines. The purpose of this invention is to provide a novel electric lifting and tilting machine specifically designed for efficient connection of AGV (Automated Guided Vehicle) trolleys, aiming to automate the entire process of material handling and unloading. This equipment not only has the capacity to carry heavy-duty hoppers but also automatically identifies the hopper's position and intelligently triggers subsequent lifting and tilting actions. In practical applications, the AGV precisely transports and places the hopper carrying materials onto the machine platform. The electric lifting and tilting machine then smoothly completes the vertical lifting and performs an adjustable-angle tilting operation according to preset parameters, ensuring that the material in the hopper is completely and thoroughly dumped onto the opposite conveyor line, eliminating any residue. The machine features high integration, precise control, and stable operation, combining safety and flexible adaptability. It effectively replaces traditional manual intervention or semi-automatic unloading methods, significantly improving logistics efficiency and production line collaboration, and is suitable for various scenarios such as intelligent manufacturing and warehousing logistics.

[0009] This invention provides a novel electric lifting and tilting machine suitable for docking AGV trolleys, such as... Figure 1 , 2 As shown, the electric lifting and tilting machine (2) includes: a fixed frame assembly (3), a connecting frame assembly (4), a transmission device assembly (5), an upper limit hydraulic damper (6), a safety guard (7), and a lower limit hydraulic damper (8). The fixed frame assembly (3) is used to provide an overall support frame, the connecting frame assembly (4) is used to connect the hopper (1), the transmission device assembly (5) is located on the bottom outside of the fixed frame assembly (3) and is used to drive the connecting frame assembly (4) to move up and down and tilt along the fixed frame assembly (3), the upper limit hydraulic damper (6) and the lower limit hydraulic damper (8) are used to limit the connecting frame assembly (4), and the safety guard (7) is used to provide protection.

[0010] When working, the electric lifting and turning machine (2) carries the hopper (1) to lift and turn it, which can pour the material in the hopper (1) into the designated equipment and then return to the original position. The overall workflow is as follows: the AGV trolley transports the hopper (1) full of material to the station of the electric lifting and turning machine (2), the AGV trolley places the full hopper (1) on the connecting frame, the AGV trolley leaves, the photoelectric sensor on the electric lifting and turning machine (2) senses the hopper (1), the electric lifting and turning machine (2) lifts the hopper (1) to the designated height, the material in the hopper (1) is poured out, the frequency conversion motor drives the chain to rotate until the hopper (1) returns to the original position.

[0011] in, Safety protection (7) is a safety guard installed on the transmission part of the reducer. It is fixed on the lower fixed seat (13) of the transmission device of the fixed frame assembly (3) and serves the functions of safety protection and aesthetics.

[0012] The fixed frame assembly (3) includes: an upper connecting plate (9), a vertical slide (10), a left slide (11), a lower hydraulic damper mounting base (12), a lower transmission mounting base (13), a lower fixed base (14), an upper hydraulic damper mounting base (15), a vertical support rod (16), a height adjustment plate (17), a pad (18), a right slide (19), a height adjustment bolt (20), and an upper chain drive mounting plate (21).

[0013] The upper connecting plate (9) and the lower fixed base (14) are used to connect the left and right vertical slides (10). The left slide (11) and the right slide (19) are fixed to the left and right vertical slides (10) respectively by pads (18) and are supported by vertical support rods (16) to enhance the overall strength. The lower end of the vertical support rod (16) is fixedly connected to the lower fixed base (14) by height adjustment bolts (20), and the upper end of the vertical support rod (16) is fixed to the left slide (11) and the right slide (19) by bolts through pads (18).

[0014] The height of the left slide rail (11) and the right slide rail (19) is adjusted by combining three components: a height adjustment plate (17), a pad plate (18), and a height adjustment bolt (20), to accommodate connecting platforms of different heights after the electric lifting tilting machine. The lower fixed base (14) of the fixed frame assembly (3) is provided with an installation opening, and the fixed frame assembly (3) is fixed to the ground by chemical bolts.

[0015] The transmission assembly (5) drives the lower transmission shaft (32) to rotate via a variable frequency motor (27) and a reducer (28). Both ends of the transmission shaft are fixed to the fixed frame assembly (3) via flanges (30). The reducer (28) is fixed to the lower fixed seat (13) of the transmission assembly (3) via an intermediate connector (29). The main transmission sprockets (31) are installed on the left and right sides of the lower transmission shaft (32), and the main transmission sprockets (31) drive the driven sprockets (24) at the top via a chain (25). The two main transmission sprockets (31) are located on the lower side of the fixed frame, and the two driven sprockets (24) are connected to the tensioning mechanism (22) via a short transmission shaft (23). At the same time, the tensioning mechanism (22) is fixed to the upper chain transmission mounting plates (21) on the left and right sides of the fixed frame via bolts. The left and right chains (25), the left and right main drive sprockets (31), and the left and right driven sprockets (24) are all located in the left and right vertical slides (10). The photoelectric switch assembly (26) is fixed to the corresponding part of the vertical slide (10) of the fixed frame assembly (3) and is used to detect the starting position and the stopping position of the connecting frame (3).

[0016] The connecting frame assembly (4) includes: a rectangular frame (33), two sets of left and right chain fixing seats (34), a left guide support rod (35), a right guide support rod (36), two sets of left and right lower drive wheel assemblies (37), two sets of left and right upper drive wheel support frames (38), and two sets of left and right upper drive wheel assemblies (39). The connecting frame assembly (4) is located in the middle of the fixed frame assembly (3). The two sets of left and right lower drive wheel assemblies (37) are located in the left and right vertical slide grooves (10) of the fixed frame assembly (3) and slide up and down along the slide grooves during operation. The two sets of left and right upper drive wheel assemblies (39) are located in the left slide groove (11) and the right slide groove (19) and slide along the slide grooves. The two sets of left and right chain fixing seats (34) are fixedly connected to the left and right chains (25) respectively. During the movement of the variable frequency motor (27) with the left and right chains (25), the connecting frame assembly (4) moves up and down as a whole. When the two sets of upper drive wheel assemblies (39) in the left and right sides of the connecting frame assembly (4) transition from the vertical track in the left slide (11) and the right slide (19) to the horizontal track, the connecting frame assembly (4) simultaneously performs a flipping action. During the flipping process, the hopper (1) fixed on the connecting frame assembly (4) pours out the material inside. At the same time, the upper photoelectric switch assembly (26) fixed in the vertical slide (10) detects the position status of the hopper (1) and uploads the position status to the PLC control system.

[0017] In the connecting frame assembly (4), the left guide support rod (35) and the right guide support rod (36) are fixed to the lower crossbeam of the rectangular frame (33) by bolts. The crossbeam has position adjustment mounting holes to facilitate the adjustment of the center distance between the left guide support rod (35) and the right guide support rod (36). This makes it suitable for connecting hoppers (1) of different specifications and sizes.

[0018] Two upper limit hydraulic dampers (6) are respectively fixed in the upper hydraulic damper mounting seats (15) of the fixed frame assembly (3) located in the left slide (11) and right slide (19). They are used to buffer the movement of the docking frame assembly (4) to the material pouring limit position.

[0019] Two lower limit hydraulic dampers (8) are respectively fixed to the lower hydraulic damper mounting base (12) of the fixed frame assembly (3) located in the vertical slide (10). They are used to buffer the return movement of the docking frame assembly (4) to its original position.

[0020] Key points of this invention: 1. An electric lifting and tilting machine suitable for AGV trolley docking.

[0021] 2. The electric lifting and tilting machine adopts a double track, which makes the electric lifting and tilting machine run very smoothly during the material lifting process. Only one motor is needed to realize the lifting and tilting action of the hopper.

[0022] 3. The transmission chain is built into the track, resulting in an aesthetically pleasing overall appearance and safer equipment operation.

[0023] 4. Integrate hydraulic dampers at the ends of the guide rails. The equipment is prone to impact vibrations during start-up, shutdown, or extreme positions. By installing hydraulic dampers, stability and hopper safety are improved, preventing structural damage or motor burnout that could result from sudden overloads.

[0024] 5. The frame and connecting frame are adjustable by means of adjusting bolts and multi-hole adjustable structure, which can adapt to different loading and unloading connection heights and different hopper specifications, and have strong compatibility.

[0025] Effects of the invention: This invention provides an electric lifting and tilting machine suitable for AGV (Automated Guided Vehicle) docking. Through multiple structural and control innovations, it significantly improves the stability, safety, and compatibility of the equipment. First, the machine adopts a double-rail guide structure, combined with a single-motor drive system, cleverly achieving synchronous lifting and tilting of the hopper. This simplifies the transmission system, reduces energy consumption, and ensures smooth and reliable operation, effectively avoiding the swaying or uneven loading problems common in traditional single-rail structures. Second, the transmission chain is completely integrated into the guide rail, not only making the overall appearance simple and aesthetically pleasing but also greatly improving operational safety and preventing accidental contact with moving parts. Furthermore, a hydraulic damper is integrated at the end of the guide rail, effectively absorbing the impact vibration generated during start-up, shutdown, and reaching extreme positions, significantly improving the system's operational stability, protecting the material in the hopper from disturbance, and avoiding the risk of mechanical damage or motor burnout due to sudden overload. Finally, the frame and docking frame adopt an adjustable bolt and multi-hole adjustable structure design, which can flexibly adapt to loading and unloading stations of different heights and various hopper sizes, greatly enhancing the equipment's versatility and deployment efficiency in different production line environments. In summary, this invention ensures efficient operation while also taking into account safety, stability, and flexible adaptability, making it particularly suitable for scenarios involving collaborative operation with AGVs in intelligent logistics and automated production lines.

[0026] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A novel electric lifting and tilting machine suitable for docking AGV trolleys, characterized in that, The electric lifting and tilting machine (2) includes: a fixed frame assembly (3), a connecting frame assembly (4), a transmission device assembly (5), an upper limit hydraulic damper (6), a safety guard (7), and a lower limit hydraulic damper (8); the fixed frame assembly (3) is used to provide an overall support frame, the connecting frame assembly (4) is used to connect the hopper (1), the transmission device assembly (5) is located on the bottom outside of the fixed frame assembly (3) and is used to drive the connecting frame assembly (4) to move up and down and tilt along the fixed frame assembly (3), the upper limit hydraulic damper (6) and the lower limit hydraulic damper (8) are used to limit the connecting frame assembly (4), and the safety guard (7) is used to provide protection; When working, the electric lifting and turning machine (2) carries the hopper (1) to lift and turn, pouring the material in the hopper (1) into the designated equipment, and then returns to the original position. The overall workflow is as follows: the AGV trolley transports the hopper (1) filled with material to the station of the electric lifting and turning machine (2), the AGV trolley places the full hopper (1) on the connecting frame, the AGV trolley leaves, the photoelectric sensor on the electric lifting and turning machine (2) senses the hopper (1), the electric lifting and turning machine (2) lifts the hopper (1) to the designated height, the material in the hopper (1) is poured out, the frequency conversion motor drives the chain to rotate until the hopper (1) returns to the original position.

2. The novel electric lifting and tilting machine for docking AGV trolleys as described in claim 1, characterized in that, Safety protection (7) is a safety guard installed on the transmission part of the reducer. It is fixed on the lower fixed seat (13) of the transmission device of the fixed frame assembly (3) and serves the functions of safety protection and aesthetics.

3. The novel electric lifting and tilting machine for docking AGV trolleys as described in claim 1, characterized in that, The fixed frame assembly (3) includes: an upper connecting plate (9), a vertical slide (10), a left slide (11), a lower hydraulic damper mounting base (12), a lower transmission mounting base (13), a lower fixed base (14), an upper hydraulic damper mounting base (15), a vertical support rod (16), a height adjustment plate (17), a pad (18), a right slide (19), a height adjustment bolt (20), and an upper chain drive mounting plate (21).

4. The novel electric lifting and tilting machine for docking AGV trolleys as described in claim 3, characterized in that, The upper connecting plate (9) and the lower fixed base (14) are used to connect the left and right vertical slides (10). The left slide (11) and the right slide (19) are fixed to the left and right vertical slides (10) respectively by the pad (18) and are supported by the vertical support rod (16) to strengthen the overall strength. The lower end of the vertical support rod (16) is fixedly connected to the lower fixed base (14) by the height adjustment bolt (20), and the upper end of the vertical support rod (16) is fixed to the left slide (11) and the right slide (19) by the pad (18) with bolts.

5. The novel electric lifting and tilting machine for docking AGV trolleys as described in claim 4, characterized in that, The height of the left slide (11) and right slide (19) is adjusted by combining three components: height adjustment plate (17), pad (18), and height adjustment bolt (20), which can be used to adapt to the different heights of the connecting platform after the electric lifting and tilting machine; the lower fixed base (14) of the fixed frame assembly (3) is provided with an installation opening, and the fixed frame assembly (3) is fixed to the ground by chemical bolts.

6. The novel electric lifting and tilting machine for docking AGV trolleys as described in claim 3, characterized in that, The transmission device assembly (5) drives the lower transmission shaft (32) to rotate via a variable frequency motor (27) and a reducer (28). Both ends of the transmission shaft are fixed to the fixed frame assembly (3) via flanges (30). The reducer (28) is fixed to the lower fixed seat (13) of the transmission device of the fixed frame assembly (3) via an intermediate connector (29). The lower transmission shaft (32) has main transmission sprockets (31) installed on its left and right sides respectively. The main transmission sprockets (31) drive the driven sprocket (24) at the top via a chain (25). The two main transmission sprockets (31) Located on the lower side of the fixed frame, two driven sprockets (24) are connected to the tensioning mechanism (22) through a short drive shaft (23). At the same time, the tensioning mechanism (22) is fixed to the upper chain drive mounting plate (21) on the left and right sides of the fixed frame by bolts. The left and right chains (25), the left and right main drive sprockets (31), and the left and right driven sprockets (24) are all located in the left and right vertical slides (10). The photoelectric switch assembly (26) is fixed to the corresponding part of the vertical slide (10) of the fixed frame assembly (3) and is used to detect the starting position and the stopping position of the connecting frame (3).

7. The novel electric lifting and tilting machine for docking AGV trolleys as described in claim 3, characterized in that, The connecting frame assembly (4) includes: a rectangular frame (33), two sets of left and right chain fixing seats (34), a left guide support rod (35), a right guide support rod (36), two sets of left and right lower drive wheel assemblies (37), two sets of left and right upper drive wheel support frames (38), and two sets of left and right upper drive wheel assemblies (39); the connecting frame assembly (4) is located in the middle of the fixed frame assembly (3), the two sets of left and right lower drive wheel assemblies (37) are located in the left and right vertical slide grooves (10) of the fixed frame assembly (3), and slide up and down along the slide grooves during operation; the two sets of left and right upper drive wheel assemblies (39) are located in the left slide groove (11) and the right slide groove (19) and slide along the slide grooves; the two sets of left and right chain fixing seats (35) are located in the middle of the fixed frame assembly (36), the left and right lower drive wheel assemblies (37) are located in the left and right vertical slide grooves (10), and slide up and down along the slide grooves during operation; the two sets of left and right chain fixing seats (35) are located in the left and right vertical slide grooves (11) and slide grooves (19), and slide along the slide grooves; the two sets of left and right chain fixing seats (35) are located in the left and right vertical slide grooves (10), and slide up and down along the slide grooves during operation ... 4) They are fixedly connected to the left and right chains (25) respectively; during the process of the variable frequency motor (27) moving the left and right chains (25), the connecting frame assembly (4) is driven to move up and down as a whole; when the left and right two sets of upper transmission wheel assemblies (39) in the connecting frame assembly (4) transition from the vertical track in the left slide (11) and right slide (19) to the horizontal track, the connecting frame assembly (4) simultaneously performs a flipping action. During the flipping process, the hopper (1) fixed on the connecting frame assembly (4) pours out the material inside. At the same time, the upper photoelectric switch assembly (26) fixed in the vertical slide (10) detects the position status of the hopper (1) and uploads the position status to the PLC control system.

8. The novel electric lifting and tilting machine for docking AGV trolleys as described in claim 7, characterized in that, In the connecting frame assembly (4), the left guide support rod (35) and the right guide support rod (36) are fixed to the lower crossbeam of the rectangular frame (33) by bolts. The crossbeam has position adjustment mounting holes, which facilitates the adjustment of the center distance between the left guide support rod (35) and the right guide support rod (36). This makes it suitable for connecting hoppers (1) of different specifications and sizes.

9. The novel electric lifting and tilting machine for docking AGV trolleys as described in claim 3, characterized in that, Two upper limit hydraulic dampers (6) are respectively fixed in the upper hydraulic damper fixing seat (15) of the fixed frame assembly (3) located in the left slide (11) and right slide (19) to buffer the movement of the dock frame assembly (4) to the material pouring limit position.

10. The novel electric lifting and tilting machine for AGV trolley docking as described in claim 3, characterized in that, Two lower limit hydraulic dampers (8) are respectively fixed to the lower hydraulic damper fixing seat (12) of the fixed frame assembly (3) located in the vertical slide (10) for buffering when the docking frame assembly (4) returns to its original position.

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