Rail-mounted crane maintenance shaft sleeve dismounting device

Abstract

The application belongs to the technical field of shaft sleeve dismounting, and particularly relates to a shaft sleeve dismounting device for track crane maintenance, which comprises a mechanical arm, a drawing main body arranged at the tail end of the mechanical arm, a clamping assembly arranged on the drawing main body and configured to be capable of being radially contracted to externally clamp and position the shaft sleeve of the track crane, and a tight assembly comprising a primary tight structure. The primary tight structure and the secondary tight structure are arranged, the primary tight structure realizes initial inner wall adhesion positioning by driving the cone to push the tight block, the secondary tight structure utilizes the elastic expansion of the tight sleeve main body and the force transmission mechanism of the connecting rod, the shaft sleeve resistance is automatically converted into radially increasing tight force at the starting moment of axial drawing, the self-locking effect that the tight force increases synchronously with the drawing force is realized, the problems of slipping, tightness loss and loosening of the shaft sleeve with rust and large interference are solved, and the reliability and success rate of high-load dismounting are greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of bushing disassembly technology, and in particular relates to a bushing disassembly device for maintenance of rail cranes. Background Technology

[0002] As a key heavy-duty equipment for container loading and unloading and bulk cargo transfer in ports, rail-mounted cranes generally adopt bushing and shaft hole interference fit structures in their core transmission parts such as traveling mechanism, slewing bearing, and hoisting drum. These structures serve to provide positioning, wear reduction, load bearing, and impact buffering. The bushing disassembly device for rail-mounted crane maintenance is a special maintenance tool designed specifically for interference fit bushings in the slewing, traveling, and hoisting mechanisms of rail-mounted cranes (gantry cranes, overhead cranes, etc.). Its core function is to use mechanical or hydraulic axial force to pull or push the worn or corroded bushing out of the journal or hole seat without damage. It is suitable for heavy-duty, large-sized, and space-constrained maintenance sites for rail-mounted cranes.

[0003] Existing tooling can only achieve single external clamping or single-point internal clamping, without end face initial positioning or circumferential uniform constraint. During disassembly, the bushing is prone to radial runout, axial movement, and eccentric force, which not only significantly increases frictional resistance but also aggravates the scratch damage between the bushing and the hole wall. Moreover, conventional internal expansion structures only provide one-time mechanical tightening with a constant and limited tightening force. When faced with bushings with large interference fits, rust adhesion, or oil stains, the initial tightening force decays rapidly, and even a slight increase in axial pull-out force can cause slippage, detachment, and loosening. This not only leads to disassembly failure but may also cause high-risk situations such as bushing flying out or tooling rebound. Summary of the Invention

[0004] The purpose of this invention is to address the problems mentioned in the background art by providing a bushing disassembly device for maintenance of rail cranes.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions: A bushing disassembly device for maintenance of a rail crane includes a robotic arm and a pulling body disposed at the end of the robotic arm; A clamping assembly disposed on the pulling body, the clamping assembly being configured to retract radially to clamp and position the bushing of the rail crane from the outside; An expansion assembly, comprising a primary expansion structure, wherein the robotic arm drives a pulling body to extend the expansion assembly into a bushing, the primary expansion structure being configured to expand radially to internally expand and position the bushing of the rail crane; The tensioning assembly also includes a secondary tensioning structure. After the tensioning assembly is tensioned to the bushing, the pulling body drives the tensioning assembly to move away from the crane. The secondary tensioning structure increases the tensioning force between the primary tensioning structure and the inner wall of the bushing. After the tensioning force increases, the robotic arm drives the pulling body to move along the axial direction of the bushing to remove the bushing from its installation position.

[0006] Preferably, the clamping assembly includes a support plate disposed at the end of the pulling body; An electric telescopic rod is installed on the pulling body. When the robotic arm drives the pulling body to approach the bushing, the support plate first contacts the end face of the bushing. The electric telescopic rod will then drive the primary tensioning structure to expand radially, so that the primary tensioning structure positions the bushing of the rail crane.

[0007] Preferably, the primary expansion structure includes multiple expansion blocks arranged circumferentially along the support plate. A rectangular groove is provided on the support plate, and an elastic element is provided in the rectangular groove. The elastic element is fixedly connected to the expansion blocks. A drive cone is axially movably disposed between the plurality of expansion blocks. When the drive cone moves axially, it pushes the plurality of expansion blocks to expand radially outward. The outer wall of the plurality of expansion blocks is tightly connected to the inner wall of the bushing.

[0008] Preferably, the secondary expansion structure includes an expansion sleeve body that is elastic, the outer wall of the expansion sleeve body is provided with an expansion surface that contacts the inner wall of the bushing, the driving cone is provided with a pumping device, and a hose is provided between the pumping device and the expansion sleeve body.

[0009] Preferably, the expansion assembly further includes a sealing housing, the outer surface of which is provided with a connecting rod. The connecting rod is rotatably connected to the expansion block, and the two ends of the connecting rod are respectively rotatably connected to the sealing housing and the expansion sleeve body. When the robotic arm drives the pulling body to move axially, the expansion sleeve body that is in contact with the inner wall of the bushing tends to move in the opposite direction. The connecting rod converts this tendency into a driving force that drives the expansion block to expand further radially, thereby increasing the expansion force between the expansion block and the inner wall of the bushing.

[0010] Preferably, the connection between the connecting rod and the sealing housing is fixedly connected by a telescopic component.

[0011] Preferably, the sealed housing is provided with a square plate, the square plate has an opening, the side of the square plate away from the drive cone is elastically provided with a circular baffle that matches the opening, the square plate has an arc-shaped hole, the end of the square plate near the drive cone is provided with a square baffle that matches the arc-shaped hole, and the square baffle is rotatably connected to the drive cone.

[0012] Preferably, an electromagnetic bearing is provided at the connection between the square baffle and the circular baffle.

[0013] Preferably, the clamping assembly further includes a movable frame, a movable block is provided on the support plate, a clamping block is fixed on the movable block, a connecting rod is provided between the movable block and the movable frame, and the two ends of the connecting rod are rotatably connected to the movable frame and the movable block respectively. When the movable frame moves, the connecting rod drives the clamping block to move toward the bushing.

[0014] Compared with existing technologies, the advantages of this rail crane maintenance bushing disassembly device are: 1. This invention sets up a primary tightening structure and a secondary tightening structure. The primary tightening achieves initial inner wall contact and positioning by driving the tightening block through the driving cone. The secondary tightening utilizes the elastic expansion of the main body of the sleeve and the linkage force transmission mechanism. At the moment of axial pull-out, the sleeve resistance is automatically converted into radially increasing tightening force, realizing a self-locking effect in which the tightening force increases synchronously with the pull-out force. This completely solves the problems of slippage, detachment, and loosening of rusted and large interference sleeves, and greatly improves the reliability and success rate of high-load disassembly.

[0015] 2. This invention sets up a clamping assembly, with the support plate first completing the precise axial positioning of the bushing end face. The clamping assembly contracts radially from the outer periphery to tighten, ensuring that the bushing, the tensioning mechanism, and the pulling mechanism are strictly coaxial throughout the process, completely eliminating wobble, slippage, and eccentric force, and avoiding damage such as bushing deformation, hole wall scratches, and spindle pull from the root, thus achieving truly non-destructive disassembly.

[0016] 3. This invention can complete the entire closed-loop operation of automatic alignment, automatic feeding, automatic clamping, automatic expansion, automatic pulling, and automatic reset without the need for close-range manual operation, which significantly reduces the labor intensity and safety risks in high-altitude, heavy-load, and confined spaces; the clamping and expansion mechanism can adapt to different inner diameter, outer diameter, and wall thickness bushings, making it multi-purpose and highly versatile, greatly reducing the number of tooling parts and preparation time.

[0017] 4. This invention adopts a mechanical and hydraulic composite drive, eliminating destructive methods such as hammering and heating, protecting the integrity of core components such as bushings, main shafts, and mounting holes, and reducing the scrap rate of spare parts and the cost of repeated maintenance; key components such as elastic elements, sealing structures, and connecting rod transmissions are subjected to uniform force and have low wear, resulting in high overall stability and long service life of the device, and outstanding comprehensive economic benefits in the long term. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall rear structure of a bushing disassembly device for maintenance of a rail crane provided by the present invention; Figure 2 This is a schematic diagram of the overall front structure of a bushing disassembly device for maintenance of a rail crane provided by the present invention; Figure 3 This is a partial structural schematic diagram of a bushing disassembly device for maintenance of a rail crane provided by the present invention; Figure 4 This is a schematic diagram of the primary tightening structure of a bushing disassembly device for maintenance of a rail crane provided by the present invention; Figure 5 This is a schematic diagram of the secondary tightening structure of a bushing disassembly device for maintenance of a rail crane provided by the present invention.

[0019] Figure 6 This is a schematic diagram of the clamping component of a bushing disassembly device for maintenance of a rail crane provided by the present invention; Figure 7 This is a schematic diagram of the internal structure of the expansion assembly of a bushing disassembly device for maintenance of a rail crane provided by the present invention; Figure 8 This invention provides Figure 7 Enlarged schematic diagram of the structure at point A in the middle; Figure 9 This is a schematic diagram of the internal structure of the sealed housing of a bushing disassembly device for maintenance of a rail crane provided by the present invention; Figure 10 This is a schematic diagram of the overall structure of the clamping assembly of a bushing disassembly device for maintenance of a rail crane provided by the present invention.

[0020] In the diagram: 1. Robotic arm; 2. Pulling body; 3. Expansion assembly; 4. Clamping assembly; 31. Expansion block; 32. Rectangular groove; 33. Drive cone; 35. Expansion sleeve body; 36. Sealing shell; 37. Connecting rod; 361. Square plate; 362. Circular baffle; 363. Arc-shaped hole; 364. Square baffle; 41. Support plate; 42. Movable frame; 43. Electric telescopic rod; 44. Movable block; 45. Clamping block; 46. Connecting rod. Detailed Implementation

[0021] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] Example: Refer to Figures 1 to 10A bushing removal device for maintenance of a rail crane includes a robotic arm 1, a pulling body 2 disposed at the end of the robotic arm 1, a clamping assembly 4 disposed on the pulling body 2, the clamping assembly 4 being configured to retract radially to clamp and position the bushing of the rail crane from the outside, and a tightening assembly 3. The tightening assembly 3 includes a primary tightening structure. The robotic arm 1 drives the pulling body 2 to extend the tightening assembly 3 into the bushing. The primary tightening structure is configured to expand radially to tighten and position the bushing of the rail crane from the inside. The tightening assembly 3 also includes a secondary tightening structure. After the tightening assembly 3 is tightened and connected with the bushing, the pulling body 2 drives the tightening assembly 3 to move away from the crane. The secondary tightening structure increases the tightening force between the primary tightening structure and the inner wall of the bushing. After the tightening force increases, the robotic arm 1 drives the pulling body 2 to move axially along the bushing to remove the bushing from its installation position.

[0023] To further explain, such as Figure 6 and Figure 10 As shown, the clamping assembly 4 includes a support plate 41, which is disposed at the end of the pulling body 2, and an electric telescopic rod 43, which is disposed on the pulling body 2. When the robotic arm 1 drives the pulling body 2 to approach the bushing, the support plate 41 first contacts the end face of the bushing, and the electric telescopic rod 43 will be used to drive the primary tensioning structure to expand radially, so that the primary tensioning structure positions the bushing of the rail crane. Specifically, during the operation of the device, the robotic arm 1 drives the pulling body 2 to move towards the bushing to be disassembled. The support plate 41 of the clamping assembly 4 first contacts the end face of the bushing to achieve precise alignment. The electric telescopic rod 43 drives the movable frame 42 to move. Through the connecting rod 46, the movable block 44 and the clamping block 45 are driven to retract radially, completing stable clamping and positioning from the outside of the bushing, ensuring that the bushing maintains a stable posture throughout the disassembly process.

[0024] To elaborate further, such as Figure 4 and Figure 5 As shown, the single-stage expansion structure includes multiple expansion blocks 31 arranged circumferentially along the support plate 41. A rectangular groove 32 is provided on the support plate 41, and an elastic element is provided in the rectangular groove 32. The elastic element is fixedly connected to the expansion blocks 31. A driving cone 33 is axially movably disposed between the multiple expansion blocks 31. When the driving cone 33 moves axially, it pushes the multiple expansion blocks 31 to expand radially outward. The outer wall of the multiple expansion blocks 31 is expanded and connected to the inner wall of the bushing. Specifically, the pulling body 2 continues to advance and drives the tensioning component 3 to extend into the bushing, driving the cone 33 to move axially, pushing the circumferentially arranged tensioning block 31 to expand radially outward along the rectangular groove 32 on the support plate 41. With the cooperation of the elastic element, the tensioning block 31 fits tightly against the inner wall of the bushing, completing one tensioning to establish a reliable connection between the tensioning component 3 and the bushing.

[0025] To further explain, such as Figure 7 As shown, the secondary expansion structure includes an expansion sleeve body 35, which is elastic. The outer wall of the expansion sleeve body 35 is provided with an expansion surface that contacts the inner wall of the bushing. A pumping device is provided inside the drive cone 33, and a hose is provided between the pumping device and the expansion sleeve body 35. It should be noted that after the first tightening is completed, the pumping device injects the expansion medium into the inner cavity of the expansion sleeve body 35 through the pipeline. The elastic material expansion sleeve body 35 deforms and the tightening surface is attached to the inner wall of the bushing. The robotic arm 1 drives the pulling body 2 to form an axial retraction trend. The expansion sleeve body 35 in contact with the inner wall of the bushing is subjected to a reverse force. The force is transmitted to the tightening block 31 through the connecting rod 37, causing the tightening block 31 to expand further in the radial direction, realizing secondary tightening to strengthen the bonding strength between the tightening component 3 and the inner wall of the bushing, and avoiding slippage during the pulling process.

[0026] To elaborate further, such as Figure 7 and Figure 8 As shown, the expansion assembly 3 also includes a sealing housing 36. The outer surface of the sealing housing 36 is provided with a connecting rod 37. The connecting rod 37 is rotatably connected to the expansion block 31. The two ends of the connecting rod 37 are rotatably connected to the sealing housing 36 and the expansion sleeve body 35, respectively. When the robotic arm 1 drives the pulling body 2 to move axially, the expansion sleeve body 35, which is in contact with the inner wall of the bushing, tends to move in the opposite direction. The connecting rod 37 converts this tendency into a driving force to drive the expansion block 31 to expand further radially, thereby increasing the expansion force between the expansion block 31 and the inner wall of the bushing. The connection between the connecting rod 37 and the sealing housing 36 is fixedly connected by a telescopic component.

[0027] To further explain, such as Figure 9 As shown, a square plate 361 is provided inside the sealed housing 36. An opening is provided on the square plate 361. A circular baffle 362 adapted to the opening is elastically provided on the side of the square plate 361 away from the driving cone 33. An arc-shaped hole 363 is provided on the square plate 361. A square baffle 364 adapted to the arc-shaped hole 363 is provided at the end of the square plate 361 near the driving cone 33. The square baffle 364 is rotatably connected to the driving cone 33. An electromagnetic bearing is provided at the connection between the square baffle 364 and the circular baffle 362.

[0028] To elaborate further, such as Figure 10 As shown, the clamping assembly 4 also includes a movable frame 42, a movable block 44 is provided on the support plate 41, a clamping block 45 is fixed on the movable block 44, and a connecting rod 46 is provided between the movable block 44 and the movable frame 42. The two ends of the connecting rod 46 are rotatably connected to the movable frame 42 and the movable block 44 respectively. When the movable frame 42 moves, the connecting rod 46 drives the clamping block 45 to move toward the bushing.

[0029] The functional principle of this invention can be explained through the following operation: After the device is started, the robotic arm 1 drives the pulling body 2 to move smoothly towards the shaft sleeve to be disassembled on the rail crane according to the preset trajectory. The clamping component 4 at the end of the pulling body 2 moves forward accordingly. The support plate 41, as the front positioning component of the clamping component 4, first comes into contact with the end face of the shaft sleeve, and restricts the axial movement of the shaft sleeve by relying on its own planar structure, thus completing the initial alignment of the device and the shaft sleeve and providing a reference for subsequent clamping and tightening actions. At this time, the electric telescopic rod 43 receives the action signal and extends along the axial direction of the pulling body 2, pushing the movable frame 42 to move synchronously. 42 and connecting rod 46 form a hinged transmission structure. The axial movement of movable frame 42 is converted into the radial swing of connecting rod 46. The end of connecting rod 46 away from movable frame 42 is hinged to movable block 44, which in turn drives movable block 44 to move towards the center of bushing along a preset guide trajectory. Clamping block 45 fixed on movable block 44 then retracts radially. Multiple clamping blocks 45 apply force evenly around the outer periphery of bushing to hold bushing tightly and position it from the outside, eliminating radial wobble gap of bushing and ensuring that bushing remains coaxial during subsequent tightening and pulling processes, avoiding damage to bushing or mounting hole due to eccentric force. After the external clamping is completed, the robotic arm 1 continues to drive the pulling body 2 forward slightly. Under the drive of the pulling body 2, the tensioning assembly 3 smoothly extends into the inner cavity of the bushing. The driving cone 33 inside the tensioning assembly 3 moves axially under the thrust of the pulling body 2. The outer periphery of the driving cone 33 is provided with an inclined guide surface adapted to the tensioning block 31. Multiple tensioning blocks 31 are evenly arranged circumferentially along the support plate 41. The rectangular groove 32 opened on the support plate 41 provides radial movement guidance for the tensioning blocks 31. The elastic element installed inside the rectangular groove 32 interacts with the tensioning block 31. The tight block 31 is fixedly connected, providing the initial contraction tension for the expansion block 31. During the axial movement of the driving cone 33, its inclined guide surface continuously squeezes the inner contact surface of the expansion block 31, overcoming the contraction force of the elastic element and pushing the expansion block 31 to expand radially outward along the rectangular groove 32. The outer working surface of the expansion block 31 gradually approaches and fits against the inner wall of the bushing until the expansion block 31 and the inner wall of the bushing form a tight contact, completing one expansion action and establishing the initial connection between the expansion assembly 3 and the inner wall of the bushing, providing basic fixing conditions for secondary expansion. After the initial tightening structure stabilizes, the pumping device inside the tightening assembly 3 is activated, continuously injecting expansion medium into the inner cavity of the elastic material expansion sleeve body 35 through the pipeline inside the sealed housing 36. Under the pressure of the medium, the expansion sleeve body 35 undergoes uniform elastic deformation, and its outer tightening surface gradually expands outward and tightly adheres to the inner wall of the bushing. Relying on the elastic contact characteristics, it fills the tiny gaps in the inner wall of the bushing, increasing the contact area between the tightening assembly 3 and the bushing. At this time, the robotic arm 1 drives the pulling body 2 to generate an axial retraction tendency, and the expansion sleeve body 35... Due to the tight contact with the inner wall of the bushing, it experiences reverse frictional resistance. This resistance forms a transmission path through the connecting rod 37. The two ends of the connecting rod 37 are rotatably connected to the sealing housing 36 and the expansion sleeve body 35, respectively. The sealing housing 36 and the expansion block 31 remain relatively fixed. The reverse resistance experienced by the expansion sleeve body 35 is converted into a radial expansion driving force through the connecting rod 37 and transmitted to the expansion block 31. This pushes the expansion block 31 to expand further radially along the rectangular groove 32, thereby continuously increasing the contact pressure between the expansion block 31 and the inner wall of the bushing and completing the secondary expansion action. It should be noted that during the expansion process, part 33 will move away from the crane. In order to disassemble the device by driving part 1, part 37 can apply a certain force to part 33 through the movement tendency of part 35. When part 33 moves away from the crane, part 362 will move simultaneously with part 364. At this time, the liquid in part 361 will push part 362 to move away from part 361. The opening prevents part 361 from encountering significant resistance during movement, thus preventing it from moving. At this time, the resistance encountered by part 361 cannot overcome the friction between part 35 and part 31, so that part 361 will not drive part 36 to move, allowing part 36 to remain stationary. This ensures that there is a connection structure between part 36, i.e., part 33, and part 35. When the robotic arm 1 drives the pulling body 2 to retract, part 35 can apply a force to part 36, i.e., part 33, through part 37, further increasing the expansion force of part 35 on the inner wall of the bushing, ensuring that the device will not slip during disassembly. After the tensioning assembly 3 completes the double tensioning fixation, the robotic arm 1 outputs a stable and continuous axial pulling force, which directly acts on the pulling body 2. The pulling body 2 transmits the pulling force to the tensioning assembly 3 and the clamping assembly 4. The tensioning assembly 3 provides the core pulling force from inside the bushing, and the clamping assembly 4 assists in maintaining the posture from outside the bushing. The combined force from inside and outside drives the bushing to move synchronously. The bushing overcomes the interference fit force, frictional resistance and adhesion force between itself and the installation position, and smoothly detaches from the installation position along the axial direction, completing the bushing disassembly operation. After the disassembly is completed, the device enters the reset process. The pumping device stops injecting the expansion medium and releases the internal pressure. After losing the medium support, the expansion sleeve body 35 returns to its initial shape by relying on its own elastic properties and separates from the inner wall of the bushing. The elastic structure inside the sealing housing 36 resets, causing the square plate 361 to move back and releasing the auxiliary thrust on the expansion block 31. The elastic element in the rectangular groove 32 contracts, pulling the expansion block 31 to reset radially inward. The expansion block 31 disengages from the inner wall of the bushing, releasing the internal tension. At the same time, the electric telescopic rod 43 retracts axially, causing the movable frame 42 to move in the opposite direction. The connecting rod 46 swings in the opposite direction, pulling the movable block 44 and the clamping block 45 to open radially outward, releasing the clamping on the outside of the bushing.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bushing disassembly device for maintenance of a rail crane, comprising a robotic arm (1), characterized in that: A pulling body (2) is disposed at the end of the robotic arm (1); A clamping assembly (4) is disposed on the pulling body (2), the clamping assembly (4) being configured to retract radially to clamp and position the bushing of the rail crane from the outside; The tensioning assembly (3) includes a primary tensioning structure, wherein the robotic arm (1) drives the pulling body (2) to extend the tensioning assembly (3) into the bushing, and the primary tensioning structure is configured to expand radially to internally tension and position the bushing of the rail crane; The expansion assembly (3) also includes a secondary expansion structure. After the expansion assembly (3) is connected to the bushing in an expansion tensioning manner, the pulling body (2) drives the expansion assembly (3) to move away from the crane. The secondary expansion structure increases the tensioning force between the primary expansion structure and the inner wall of the bushing. After the tensioning force increases, the robotic arm (1) drives the pulling body (2) to move along the axial direction of the bushing to remove the bushing from its installation position.

2. The bushing disassembly device for maintenance of a rail crane according to claim 1, characterized in that, The clamping assembly (4) includes a support plate (41) disposed at the end of the pulling body (2); An electric telescopic rod (43) is installed on the pulling body (2). When the robotic arm (1) drives the pulling body (2) to approach the bushing, the support plate (41) first contacts the end face of the bushing. The electric telescopic rod (43) will be used to drive the primary tensioning structure to expand radially, so that the primary tensioning structure positions the bushing of the rail crane.

3. The bushing disassembly device for maintenance of a rail crane according to claim 2, characterized in that, The single-stage expansion structure includes multiple expansion blocks (31) arranged circumferentially along the support plate (41). A rectangular groove (32) is provided on the support plate (41), and an elastic element is provided in the rectangular groove (32). The elastic element is fixedly connected to the expansion block (31). A drive cone (33) is axially disposed between the plurality of expansion blocks (31). When the drive cone (33) moves axially, it pushes the plurality of expansion blocks (31) to expand radially outward. The outer wall of the plurality of expansion blocks (31) is tightly connected to the inner wall of the bushing.

4. The bushing disassembly device for maintenance of a rail crane according to claim 3, characterized in that, The secondary expansion structure includes an expansion sleeve body (35) which is elastic. The outer wall of the expansion sleeve body (35) is provided with an expansion surface that contacts the inner wall of the bushing. The driving cone (33) is provided with a pumping device, and a hose is provided between the pumping device and the expansion sleeve body (35).

5. The bushing disassembly device for maintenance of a rail crane according to claim 4, characterized in that, The expansion assembly (3) also includes a sealing housing (36), and a connecting rod (37) is provided on the outer surface of the sealing housing (36). The connecting rod (37) is rotatably connected to the expansion block (31). The two ends of the connecting rod (37) are rotatably connected to the sealing housing (36) and the expansion sleeve body (35) respectively. When the robotic arm (1) drives the pulling body (2) to move axially, the expansion sleeve body (35) in contact with the inner wall of the bushing tends to move in the opposite direction. The connecting rod (37) converts this tendency into a driving force to drive the expansion block (31) to expand further radially, thereby increasing the expansion force between the expansion block (31) and the inner wall of the bushing.

6. The bushing disassembly device for maintenance of a rail crane according to claim 5, characterized in that, The connection between the connecting rod (37) and the sealing housing (36) is fixedly connected by a telescopic component.

7. A bushing disassembly device for maintenance of a rail crane according to claim 5, characterized in that, The sealed housing (36) is provided with a square plate (361), the square plate (361) has an opening, and a circular baffle (362) adapted to the opening is elastically provided on the side of the square plate (361) away from the driving cone (33). An arc-shaped hole (363) is provided on the square plate (361), and a square baffle (364) adapted to the arc-shaped hole (363) is provided at the end of the square plate (361) near the driving cone (33). The square baffle (364) is rotatably connected to the driving cone (33).

8. The bushing disassembly device for maintenance of a rail crane according to claim 7, characterized in that, An electromagnetic bearing is provided at the connection between the square baffle (364) and the circular baffle (362).

9. A bushing disassembly device for maintenance of a rail crane according to claim 2, characterized in that, The clamping assembly (4) also includes a movable frame (42), a movable block (44) is provided on the support plate (41), a clamping block (45) is fixed on the movable block (44), a connecting rod (46) is provided between the movable block (44) and the movable frame (42), and the two ends of the connecting rod (46) are rotatably connected to the movable frame (42) and the movable block (44) respectively. When the movable frame (42) moves, the connecting rod (46) drives the clamping block (45) to move toward the bushing.

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