Hydraulic linear telescopic module

Abstract

The invention discloses a hydraulic linear telescopic module, and relates to the technical field of telescopic modules. The end covers are movably connected to the two ends of the cylinder body and used for sealing the cylinder body; the oil injection hole is formed in the surface of the end cover and communicates with the interior of the cylinder body; the piston rod is slidably connected into the cylinder body, and the surface of the piston rod is fixedly connected with a piston barrel; the oil return assembly comprises a main oil return cavity formed in the side, close to the cylinder body, of the end cover, an auxiliary oil return cavity is formed in the side, close to the cylinder body, of the end cover, and the buffering assembly is arranged between the two sides of the piston barrel and the end cover and used for reducing the impact force of hydraulic oil during buffering; the first magnets are fixedly connected to the two sides of the piston cylinder; the main oil return cavity is gradually closed, generated pressure fluctuation and instantaneous pressure difference are greatly reduced, impact of hydraulic oil on the interior of the cylinder body is reduced, meanwhile, the vibration amplitude of the whole module in the linear stretching and retracting process is reduced, linear stretching and retracting motion tends to be stable, and the precision of the linear stretching and retracting motion is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of telescopic modules, and particularly to a hydraulic linear telescopic module. Background Art

[0002] As the name implies, a hydraulic linear telescopic module is a module that uses a hydraulic cylinder to control an object to perform linear telescopic motion. It is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. In order to prevent the piston inside the hydraulic cylinder from hitting the cylinder head due to inertia or load force when moving to the end of the stroke, thereby generating noise, vibration, and mechanical damage, which affects the accuracy of the linear telescopic motion, a buffer component needs to be provided inside the cylinder.

[0003] The traditional buffer component of the cylinder is to set buffer sleeves on both sides of the piston barrel. When the piston barrel moves to the end of the stroke, the main oil return cavity is blocked by the buffer sleeves, so that the hydraulic oil can only flow back to the oil injection hole through the secondary oil return cavity, and the buffer is achieved by reducing the oil flow area.

[0004] According to the continuity equation, the mass of the fluid is conserved during the flow process. When the flow diameter becomes smaller, the flow velocity of the fluid will increase instantaneously to keep the flow rate unchanged.

[0005] According to Bernoulli's equation, an increase in the fluid velocity will cause a decrease in pressure. In the area where the diameter becomes smaller, the pressure of the fluid will drop rapidly, forming a pressure difference. This pressure difference will have an impact on the surrounding environment. For example, in a pipeline system, the pressure of the fluid on the pipe wall will change suddenly, which may cause the pipeline to vibrate or be damaged, and the telescopic module will be affected by vibration, resulting in the accuracy of the linear telescopic motion being affected. Summary of the Invention

[0006] The purpose of the present invention is to propose a hydraulic linear telescopic module to solve the problem that the impact of hydraulic oil on the inside of the cylinder body caused by the pressure difference during the buffer of the traditional hydraulic cylinder results in vibration of the telescopic module and affects the linear telescopic accuracy.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A hydraulic linear telescopic module includes a cylinder body;

[0009] End caps, movably connected to both ends of the cylinder body for sealing the cylinder body;

[0010] An oil injection hole, opened on the surface of the end cap and communicating with the inside of the cylinder body;

[0011] A piston rod, slidably connected to the inside of the cylinder body, and a piston barrel is fixedly connected to the surface;

[0012] The oil return assembly includes a main oil return cavity formed on the side of the end cover close to the cylinder block, and a secondary oil return cavity is formed on the side of the end cover close to the cylinder block.

[0013] It also includes a buffer assembly provided between both sides of the piston barrel and the end cover for reducing the impact force of hydraulic oil during buffering.

[0014] The first magnet is fixedly connected to both sides of the piston barrel.

[0015] The second magnet is arranged on the side close to the cylinder block inside the main oil return cavity, and oil return holes are formed on its surface.

[0016] The third magnet is fixedly connected to the side inside the main oil return cavity far from the cylinder block.

[0017] The end cap is fixedly connected to the side of the third magnet close to the cylinder block, and the length of the end cap is distributed in an arithmetic progression of the same number of multi-components.

[0018] As a further description of the above technical solution:

[0019] The sides of the first magnet and the second magnet close to each other have the same magnetic poles. After the second magnet moves towards the third magnet, the oil return holes on its surface are sequentially penetrated and blocked by the end cap.

[0020] As a further description of the above technical solution:

[0021] The sides of the second magnet and the third magnet close to each other have the same magnetic poles. A sleeve is fixedly connected to the side inside the main oil return cavity close to the cylinder block. A slider is fixedly connected to the circumferential side of the second magnet, and a chute matching the slider is formed inside the sleeve.

[0022] As a further description of the above technical solution:

[0023] An anti-rebound assembly for preventing the displacement of the piston barrel after buffering is arranged inside the main oil return cavity. The anti-rebound assembly includes a suction cup fixedly connected to the edge of the first magnet close to the end cover, and an oil guiding cavity is formed at the edge of the sleeve.

[0024] As a further description of the above technical solution:

[0025] A rectangular airbag is fixedly connected inside the chute, and a cylindrical airbag is fixedly connected to the side of the rectangular airbag far from the cylinder block. The cylindrical airbag penetrates through the chute and extends into the oil guiding cavity.

[0026] As a further description of the above technical solution:

[0027] The cylindrical airbag is communicated with the rectangular airbag and is filled with air inside. The elasticity of the cylindrical airbag is less than that of the rectangular airbag.

[0028] As a further description of the above technical solution:

[0029] The anti-rebound component further includes a rubber sleeve sleeved outside the end head, and the inside of the rubber sleeve is filled with electrorheological fluid. A movable groove is formed on one side of the end head close to the cylinder block, and a piezoelectric ceramic is fixedly connected to the side of the movable groove far from the cylinder block. A pressure block is slidably connected to the side of the movable groove close to the cylinder block, and a spring is fixedly connected between the pressure block and the piezoelectric ceramic. The pressure block is a conductor.

[0030] As a further description of the above technical solution:

[0031] The pressure block and the movable groove are sealed with a sealing ring, and the elastic force of the spring is greater than the resistance suffered by the pressure block during displacement.

[0032] As a further description of the above technical solution:

[0033] A regulating valve is arranged inside the secondary oil return cavity, and the secondary oil return cavity is communicated with the oil injection hole through the main oil return cavity.

[0034] As a further description of the above technical solution:

[0035] A connecting rod is threadedly connected between the two end covers, and a guide sleeve for restricting the movement of the piston rod is fixedly connected to the side of one end cover far from the cylinder block.

[0036] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0037] When the piston cylinder moves to the end of the stroke, the magnetic repulsive force is used to push the second magnet to displace inside the end cover, so that the second magnet approaches the third magnet until the oil return hole on the surface of the second magnet is sleeved outside the end head. The end head forms a sequential and orderly blockage of the oil return hole. Until all the oil return holes are blocked, the main oil return cavity is also blocked at the same time. The remaining hydraulic oil flows back to the oil injection hole through the secondary oil return cavity, so that the main oil return cavity is gradually closed. Compared with the original direct closing of the main oil return cavity, the generated pressure fluctuation and instantaneous pressure difference are greatly reduced, thereby reducing the impact of the hydraulic oil on the inside of the cylinder block. While reducing the damage to the inside of the cylinder block, it also reduces the vibration amplitude of the entire module during the linear telescopic process, making the linear telescopic movement tend to be stable and improving the accuracy of the linear telescopic movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Shows the overall structural schematic diagram provided by the embodiment of the present invention;

[0039] Figure 2 Shows the structural schematic diagram of the oil cylinder buffer component in the prior art provided by the embodiment of the present invention;

[0040] Figure 3 shows a schematic cross-sectional structure diagram of a cylinder block provided according to an embodiment of the present invention;

[0041] Figure 4 shows a Figure 3 magnified view at position A in

[0042] Figure 5 shows a schematic cross-sectional structure diagram of a side view of an end cover provided according to an embodiment of the present invention;

[0043] Figure 6 shows a schematic diagram of a partial mechanism of a buffer assembly provided according to an embodiment of the present invention;

[0044] Figure 7 shows a Figure 6 magnified view at position B in

[0045] Figure 8 shows a schematic diagram of a partial structure of an anti-bounce component provided according to an embodiment of the present invention.

[0046] Legend description:

[0047] 10. Cylinder block; 11. End cover; 12. Oil injection hole; 13. Connecting rod; 14. Guide sleeve; 15. Piston barrel; 16. Piston rod;

[0048] 20. Oil return assembly; 21. Main oil return cavity; 22. Sub oil return cavity; 23. Regulating valve;

[0049] 30. Buffer assembly; 31. First magnet; 32. Sleeve; 33. Second magnet; 34. Oil return hole; 35. Third magnet; 36. Head; 37. Chute; 38. Slide block;

[0050] 40. Anti-bounce component; 41. Oil guide cavity; 42. Suction cup; 43. Rectangular airbag; 44. Cylindrical airbag; 45. Rubber sleeve; 46. Activity groove; 47. Piezoelectric ceramic; 48. Pressure block; 49. Spring. Detailed implementation manners

[0051] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0052] As Figures 1-7 shown, a hydraulic linear telescopic module provided by the present invention includes a cylinder block 10;

[0053] The end cap 11 is movably connected to both ends of the cylinder block 10 for sealing the cylinder block 10;

[0054] The oil injection hole 12 is opened on the surface of the end cap 11 and communicates with the inside of the cylinder block 10;

[0055] The piston rod 16 is slidably connected to the inside of the cylinder block 10, and a piston cylinder 15 is fixedly connected to its surface;

[0056] A connecting rod 13 is threadedly connected between the two end caps 11, and a guide sleeve 14 for restricting the movement of the piston rod 16 is fixedly connected to one side of the end cap 11 away from the cylinder block 10;

[0057] The oil return assembly 20 includes a main oil return cavity 21 opened on the side of the end cap 11 close to the cylinder block 10. A secondary oil return cavity 22 is opened on the side of the end cap 11 close to the cylinder block 10. A regulating valve 23 is provided inside the secondary oil return cavity 22, and the secondary oil return cavity 22 is communicated with the oil injection hole 12 through the main oil return cavity 21;

[0058] It further includes a buffer assembly 30 provided between both sides of the piston cylinder 15 and the end cap 11 for reducing the impact force of the hydraulic oil during buffering;

[0059] The first magnet 31 is fixedly connected to both sides of the piston cylinder 15;

[0060] The second magnet 33 is provided inside the main oil return cavity 21 close to the cylinder block 10, and an oil return hole 34 is opened on its surface;

[0061] The third magnet 35 is fixedly connected to the side of the main oil return cavity 21 away from the cylinder block 10;

[0062] The end head 36 is fixedly connected to the side of the third magnet 35 close to the cylinder block 10, and the lengths of the end head 36 are distributed in an arithmetic progression of the same number of components;

[0063] The sides of the first magnet 31 and the second magnet 33 close to each other have the same magnetic poles. After the second magnet 33 moves towards the third magnet 35, the oil return holes 34 on its surface are sequentially penetrated and blocked by the end head 36;

[0064] The sides of the second magnet 33 and the third magnet 35 close to each other have the same magnetic poles. A sleeve 32 is fixedly connected to the side of the main oil return cavity 21 close to the cylinder block 10. A slider 38 is fixedly connected to the circumferential side of the second magnet 33, and a chute 37 matching the slider 38 is opened inside the sleeve 32.

[0065] Specifically, first connect the oil injection hole 12 on the end cap 11 to the fuel tank through an oil pipe. During operation, the hydraulic oil inside the fuel tank is introduced into the interior of the right end cap 11 through the oil pipe and the oil injection hole 12 by a fuel pump. The hydraulic oil enters the interior of the cylinder block 10 through the main oil return cavity 21. With the injection of the hydraulic oil, the piston cylinder 15 is pushed to move from right to left under the action of the hydraulic pressure, thereby pushing the piston rod 16 out of the cylinder block 10. During the movement process, the guide sleeve 14 guides the piston rod 16 to ensure that the piston rod 16 moves in a straight line. When the piston cylinder 15 moves to the left side inside the cylinder block 10, the hydraulic oil inside the fuel tank is then introduced into the left oil injection hole 12 through the fuel pump. At this time, under the action of the hydraulic pressure, the piston cylinder 15 is pushed to move from left to right inside the cylinder block 10, thereby driving the piston rod 16 to contract into the cylinder block 10. At the same time, the hydraulic oil originally located on the right side of the piston cylinder 15 is pushed to flow back into the fuel tank. In this way, a hydraulic linear telescopic motion is formed reciprocally;

[0066] In order to prevent the piston inside the hydraulic cylinder from hitting the cylinder head due to inertia or load force when moving to the end of the stroke, thereby generating noise, vibration, and mechanical damage, which affects the accuracy of the linear telescopic motion, a buffer assembly 30 is provided inside the oil cylinder;

[0067] When the piston cylinder 15 moves to the end of the stroke, the first magnet 31 on the side of the piston cylinder 15 will approach the second magnet 33 inside the end cap 11. Since the magnetic poles on the side where the first magnet 31 and the second magnet 33 approach are the same, the magnetic repulsive force is used to push the second magnet 33 to displace inside the end cap 11, causing the second magnet 33 to approach the third magnet 35 until the oil return hole 34 on the surface of the second magnet 33 is sleeved outside the end cap 36, and the end cap 36 forms a blockage for the oil return hole 34. Since the length of the end cap 36 is distributed in a multi-component arithmetic progression with the same number, the oil return holes 34 on the surface of the second magnet 33 will be blocked sequentially and orderly until all the oil return holes 34 are blocked. At this time, the main oil return cavity 21 is also blocked simultaneously, and the remaining hydraulic oil flows back to the oil injection hole 12 through the secondary oil return cavity 22. In this way, the main oil return cavity 21 can be gradually closed. Compared with the original direct closing of the main oil return cavity 21, the generated pressure fluctuation and instantaneous pressure difference are greatly reduced, thereby reducing the impact of the hydraulic oil on the interior of the cylinder block 10. While reducing the damage to the interior of the cylinder block 10, the vibration amplitude of the entire module during the linear telescopic process is also reduced, making the linear telescopic motion tend to be stable and improving the accuracy of the linear telescopic motion;

[0068] When the second magnet 33 moves, the slider 38 on its outer side moves along the chute 37 on the inner wall of the sleeve 32 together with it. On the one hand, the slider 38 and the chute 37 are used to prevent the second magnet 33 from rotating when it moves. On the other hand, the resistance during the movement of the second magnet 33 is increased through the slider 38 and the chute 37, reducing the inertia of the piston cylinder 15 when it reaches the end of the stroke. Thereby, the impact force when the end cap 36 seals the oil return hole 34 is reduced, and further the wear between the end cap 36 and the inner wall of the oil return hole 34 is reduced, ensuring the sealing effect of the buffer assembly 30, increasing the service life of the buffer assembly 30, and reducing the maintenance cost;

[0069] And since the magnetic poles on the sides of the second magnet 33 and the third magnet 35 close to each other are the same, when the second magnet 33 moves towards the third magnet 35, it is also blocked by the magnetic repulsive force, further offsetting the inertia of the piston cylinder 15 when it reaches the end of the stroke. This not only reduces the wear of the buffer assembly 30 but also reduces the buffer speed, decreases the pressure fluctuation and instantaneous pressure difference inside the cylinder block 10, and increases the service life of the cylinder block 10 and the stability and accuracy of the linear telescopic movement.

[0070] As Figure 3 and Figures 6-8 shown, an anti-rebound component 40 for preventing the piston cylinder 15 from rebounding after buffering is provided inside the main oil return chamber 21. The anti-rebound component 40 includes a suction cup 42 fixedly connected to the edge of the first magnet 31 on the side close to the end cap 11, and an oil guide chamber 41 is formed at the edge of the sleeve 32;

[0071] A rectangular airbag 43 is fixedly connected inside the chute 37, and a cylindrical airbag 44 is fixedly connected to the side of the rectangular airbag 43 away from the cylinder block 10. The cylindrical airbag 44 penetrates through the chute 37 and extends into the oil guide chamber 41;

[0072] The cylindrical airbag 44 is communicated with the rectangular airbag 43 and filled with air inside. The elastic force of the cylindrical airbag 44 is less than that of the rectangular airbag 43;

[0073] The anti-rebound component 40 further includes a rubber sleeve 45 sleeved outside the end cap 36, and the inside of the rubber sleeve 45 is filled with an electrorheological fluid. An activity groove 46 is formed on the side of the end cap 36 close to the cylinder block 10, and a piezoelectric ceramic 47 is fixedly connected to the side of the activity groove 46 away from the cylinder block 10. A pressure block 48 is slidably connected to the side of the activity groove 46 close to the cylinder block 10, and a spring 49 is fixedly connected between the pressure block 48 and the piezoelectric ceramic 47. The pressure block 48 is a conductor;

[0074] The pressure block 48 and the activity groove 46 are sealed with a sealing ring, and the elastic force of the spring 49 is greater than the resistance when the pressure block 48 moves.

[0075] Specifically, pressure changes and sudden load changes in the hydraulic system that affect the motion state of the oil cylinder may cause the oil cylinder to rebound during buffering. If the oil cylinder rebounds during buffering, it will reduce the stability and accuracy of the linear telescopic module.

[0076] Based on this, when the piston cylinder 15 runs to the end of the stroke for buffering, the suction cup 42 on the first magnet 31 on its side will contact and squeeze the sleeve 32, causing the oil in the suction cup 42 to be squeezed out. At this time, the suction cup 42 firmly adheres to the surface of the sleeve 32, so that the suction force of the suction cup 42 prevents the piston cylinder 15 from rebounding at the moment of rebound, thereby ensuring the stability during the operation of the hydraulic linear telescopic module and improving the accuracy of the hydraulic linear telescopic module. In addition, an oil guide cavity 41 is opened on the surface of the sleeve 32. Before buffering, the oil guide cavity 41 can be used as an oil return passage. After buffering, the hydraulic oil that enters the end cover 11 through the oil injection hole 12 will enter the inside of the oil guide cavity 41 and push the suction cup 42, so that the suction cup 42 can easily fall off when the piston cylinder 15 moves back without affecting the movement of the piston cylinder 15. In addition, during the buffering process, as the second magnet 33 moves, it will squeeze the rectangular airbag 43, causing the gas inside the rectangular airbag 43 to enter the columnar airbag 44, thereby causing the columnar airbag 44 to expand. The expanded columnar airbag 44 seals the oil guide cavity 41 to ensure that the suction cup 42 is in a sealed state after contacting the oil guide cavity 41 on the surface of the sleeve 32, improving the firmness of the suction of the suction cup 42 during the anti-rebound process.

[0077] In addition, when the oil return hole 34 is sleeved outside the end head 36, since the outside of the end head 36 is wrapped with a rubber sleeve 45 and the inside of the rubber sleeve 45 is filled with electrorheological fluid, during buffering, the second magnet 33 and the end head 36 will form a contact area and be squeezed and deformed. The rubber sleeves 45 on both sides of the contact area expand to seal the contact area, improving the sealing effect on the main oil return cavity 21 during buffering. And at the moment of buffering, the first magnet 31 impacts the pressing block 48 arranged on the side close to the end head 36, causing the pressing block 48 to move along the inside of the movable groove 46 and impact the piezoelectric ceramic 47. The piezoelectric ceramic 47 generates an instantaneous current after being impacted. The pressing block 48 as a conductor conducts the current to the electrorheological fluid, and the electrorheological fluid will instantaneously solidify after being energized. The instantaneous solidification of the electrorheological fluid is used to prevent the second magnet 33 from moving back, thereby preventing the main oil return cavity 21 from being opened during buffer rebound and avoiding buffer interruption caused by buffer rebound, ensuring that the buffering effect of the hydraulic oil cylinder is not affected.

[0078] Working principle: First, connect the oil injection hole 12 on the end cover 11 to the fuel tank through an oil pipe. During operation, the hydraulic oil inside the fuel tank is introduced into the interior of the right end cover 11 through the oil pipe and the oil injection hole 12 by means of an oil pump. The hydraulic oil enters the interior of the cylinder block 10 through the main oil return cavity 21. With the injection of the hydraulic oil, the piston cylinder 15 is pushed to move from right to left under the action of the hydraulic pressure, thereby pushing the piston rod 16 to extend out of the cylinder block 10. During the movement process, the guide sleeve 14 plays a guiding role for the piston rod 16 to ensure that the piston rod 16 moves in a straight line. When the piston cylinder 15 moves to the left side inside the cylinder block 10, the piston cylinder 15 reaches the end of the stroke. The first magnet 31 on the side of the piston cylinder 15 will approach the second magnet 33 inside the end cover 11. Since the magnetic poles on the side where the first magnet 31 and the second magnet 33 approach are the same, the magnetic repulsion force is used to push the second magnet 33 to displace inside the end cover 11, causing the second magnet 33 to approach the third magnet 35 until the oil return hole 34 on the surface of the second magnet 33 is sleeved outside the head 36, and the head 36 forms a seal for the oil return hole 34. Since the lengths of the heads 36 are distributed in an arithmetic progression of the same number of components, the oil return holes 34 on the surface of the second magnet 33 will be blocked sequentially and orderly until all the oil return holes 34 are blocked. At the same time, the main oil return cavity 21 is also blocked. The remaining hydraulic oil then flows back to the oil injection hole 12 through the secondary oil return cavity 22. After that, the hydraulic oil inside the fuel tank is introduced into the left oil injection hole 12 by the oil pump. At this time, the piston cylinder 15 is pushed to move from left to right inside the cylinder block 10 under the action of the hydraulic pressure, thereby driving the piston rod 16 to contract into the interior of the cylinder block 10. At the same time, the hydraulic oil originally located on the right side of the piston cylinder 15 is pushed to flow back into the fuel tank. In this way, a reciprocating hydraulic linear telescopic motion is formed.

[0079] As described above, the above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A hydraulic linear telescopic module, comprising a cylinder block (10); End caps (11), movably connected to both ends of the cylinder block (10) for sealing the cylinder block (10); An oil injection hole (12), opened on the surface of the end cap (11) and communicating with the interior of the cylinder block (10); A piston rod (16), slidably connected to the interior of the cylinder block (10), and a piston cylinder (15) is fixedly connected to the surface; An oil return assembly (20), comprising a main oil return cavity (21) opened on the side of the end cap (11) close to the cylinder block (10), and a secondary oil return cavity (22) is opened on the side of the end cap (11) close to the cylinder block (10); Characterized in that, It further includes a buffer assembly (30) provided between both sides of the piston cylinder (15) and the end cap (11) for reducing the impact force of hydraulic oil during buffering; First magnets (31), fixedly connected to both sides of the piston cylinder (15); Second magnets (33), arranged on the side of the main oil return cavity (21) close to the cylinder block (10) and having oil return holes (34) opened on the surface; Third magnets (35), fixedly connected to the side of the main oil return cavity (21) far from the cylinder block (10); A head (36), fixedly connected to the side of the third magnet (35) close to the cylinder block (10), and the lengths of the heads (36) are distributed in an arithmetic progression of the same number of components; 2. The hydraulic linear telescopic module according to claim 1, wherein The sides of the first magnets (31) and the second magnets (33) close to each other have the same magnetic poles. After the second magnets (33) move towards the third magnets (35), the oil return holes (34) on their surfaces are sequentially penetrated and blocked by the heads (36).

3. A hydraulic linear telescopic module according to claim 1, characterized in that The sides of the second magnets (33) and the third magnets (35) close to each other have the same magnetic poles. A sleeve (32) is fixedly connected to the side of the main oil return cavity (21) close to the cylinder block (10). A slider (38) is fixedly connected to the circumferential side of the second magnet (33). A chute (37) matching the slider (38) is opened on the inner side of the sleeve (32).

4. A hydraulic linear telescopic module according to claim 3, characterized in that, A anti-rebound assembly (40) for preventing the piston cylinder (15) from displacing after buffering is provided inside the main oil return cavity (21). The anti-rebound assembly (40) includes a suction cup (42) fixedly connected to the edge of the first magnet (31) close to the end cap (11). An oil guiding cavity (41) is opened at the edge of the sleeve (32).

5. A hydraulic linear telescopic module according to claim 4, characterized in that, A rectangular airbag (43) is fixedly connected to the inside of the chute (37), and a cylindrical airbag (44) is fixedly connected to the side of the rectangular airbag (43) far from the cylinder block (10). The cylindrical airbag (44) penetrates through the chute (37) and extends into the oil guiding cavity (41).

6. The hydraulic linear telescopic module according to claim 5, characterized in that, The cylindrical airbag (44) communicates with the rectangular airbag (43) and is filled with air inside. The elasticity of the cylindrical airbag (44) is less than that of the rectangular airbag (43).

7. A hydraulic linear telescopic module according to claim 6, wherein, The anti-rebound component (40) further includes a rubber sleeve (45) sleeved outside the head (36), and the inside of the rubber sleeve (45) is filled with electrorheological fluid. An activity groove (46) is formed on one side of the head (36) close to the cylinder block (10), and a piezoelectric ceramic (47) is fixedly connected to the side of the activity groove (46) far from the cylinder block (10). A pressure block (48) is slidably connected to the side of the activity groove (46) close to the cylinder block (10), and a spring (49) is fixedly connected between the pressure block (48) and the piezoelectric ceramic (47). The pressure block (48) is a conductor.

8. A hydraulic linear telescopic module according to claim 7, wherein, The pressure block (48) and the activity groove (46) are sealed with a sealing ring, and the elastic force of the spring (49) is greater than the resistance suffered by the pressure block (48) during displacement.

9. The hydraulic linear telescopic module according to claim 1, characterized in that, A regulating valve (23) is arranged inside the secondary oil return cavity (22), and the secondary oil return cavity (22) is communicated with the oil injection hole (12) through the main oil return cavity (21).

10. A hydraulic linear telescopic module according to claim 1, characterized in that, A connecting rod (13) is threadedly connected between the two end covers (11), and a guide sleeve (14) for restricting the movement of the piston rod (16) is fixedly connected to the side of one end cover (11) far from the cylinder block (10).

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