Hydraulic linear telescopic module

Abstract

The application discloses a hydraulic linear telescopic module, relates to the technical field of telescopic modules, and comprises a cylinder body, end covers movably connected to the two ends of the cylinder body for sealing the cylinder body, oil injection holes arranged on the surface of the end cover and communicated with the inside of the cylinder body, a piston rod slidably connected to the inside of the cylinder body and fixedly connected with a piston barrel on the surface, an oil return assembly comprising a main oil return cavity arranged on the side of the end cover close to the cylinder body, a vice oil return cavity arranged on the side of the end cover close to the cylinder body, and a buffer assembly arranged between the piston barrel and the end cover on the two sides of the piston barrel for reducing the impact force of hydraulic oil during buffering, and first magnets fixedly connected to the two sides of the piston barrel. The main oil return cavity is gradually closed, the generated pressure fluctuation and instantaneous pressure difference are greatly reduced, the impact of hydraulic oil on the inside of the cylinder body is reduced, the vibration amplitude of the whole module during linear telescopic movement is reduced, the linear telescopic movement tends to be stable, and the precision of linear telescopic movement is improved.

Description

Technical Field

[0001] This invention relates to the field of telescopic module technology, and more particularly to a hydraulic linear telescopic module. Background Technology

[0002] As the name suggests, 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 it reaches the end of its stroke, thereby generating noise, vibration and mechanical damage, which would affect the accuracy of the linear telescopic motion, a buffer component needs to be installed inside the cylinder.

[0003] Traditional hydraulic cylinder buffer components use buffer sleeves on both sides of the piston cylinder. When the piston cylinder reaches the end of its stroke, the buffer sleeves block the main return oil chamber, so that the hydraulic oil can only flow back to the oil injection hole through the secondary return oil chamber. Buffering is achieved by reducing the area of ​​oil flow.

[0004] According to the continuity equation, mass is conserved during fluid flow. When the flow diameter decreases, the fluid velocity increases instantaneously to maintain a constant flow rate.

[0005] According to Bernoulli's equation, an increase in fluid velocity leads to a decrease in pressure. In regions where the diameter decreases, the fluid pressure drops rapidly, creating a pressure difference. This pressure difference can have an impact on the surrounding environment. For example, in a piping system, sudden changes in fluid pressure against the pipe wall can cause pipe vibration or damage, affecting the accuracy of the linear telescopic movement of the telescopic module due to vibration. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that the hydraulic oil impacts the inside of the cylinder due to pressure difference during buffering in traditional hydraulic cylinders, causing vibration in the telescopic module and affecting the accuracy of linear telescopic movement. Therefore, a hydraulic linear telescopic module is proposed.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

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

[0009] End caps, movably connected to both ends of the cylinder body, are used to seal the cylinder body.

[0010] An oil injection hole is provided on the surface of the end cap and communicates with the inside of the cylinder.

[0011] The piston rod is slidably connected to the inside of the cylinder, and a piston cylinder is fixedly connected to its surface;

[0012] The oil return assembly includes a main oil return chamber located on the side of the end cover near the cylinder block, and a secondary oil return chamber located on the side of the end cover near the cylinder block.

[0013] It also includes a buffer assembly located between the piston cylinder and the end cap to reduce the impact force of hydraulic oil during buffering.

[0014] The first magnet is fixedly connected to both sides of the piston cylinder;

[0015] The second magnet is located inside the main oil return chamber on the side near the cylinder body and has an oil return hole on its surface.

[0016] The third magnet is fixedly connected to the side of the main oil return chamber away from the cylinder body;

[0017] The end cap is fixedly connected to the side of the third magnet near the cylinder body, and the length of the end cap is distributed in a multi-component arithmetic sequence with the same number of components.

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

[0019] The first magnet and the second magnet have the same magnetic pole on the side that are close to each other. After the second magnet moves toward the third magnet, the oil return hole on its surface is blocked by the end cap in turn.

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

[0021] The second magnet and the third magnet have the same magnetic poles on the side closest to each other. A sleeve is fixedly connected to the inside of the main oil return chamber on the side near the cylinder body. A slider is fixedly connected to the ring side of the second magnet. A groove matching the slider is opened on the inner side of the sleeve.

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

[0023] The main return oil chamber is equipped with an anti-rebound assembly to prevent the piston cylinder from shifting after buffering. The anti-rebound assembly includes a suction cup fixedly connected to the edge of the first magnet near the end cap. An oil guide cavity is provided 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 slide groove, and a cylindrical airbag is fixedly connected to the side of the rectangular airbag away from the cylinder body. The cylindrical airbag extends through the slide groove into the interior of the oil guide cavity.

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

[0027] The cylindrical airbag is connected to the rectangular airbag and is filled with air. 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 assembly also includes a rubber sleeve fitted over the outside of the end cap, and the inside of the rubber sleeve is filled with electrorheological fluid. The end cap has a movable groove on the side near the cylinder body, and a piezoelectric ceramic is fixedly connected to the inside of the movable groove on the side away from the cylinder body. A pressure block is slidably connected to the inside of the movable groove on the side near the cylinder body, 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 spring force is greater than the resistance encountered when the pressure block is displaced.

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

[0033] The auxiliary return oil chamber is equipped with a regulating valve, and the auxiliary return oil chamber is connected to the oil injection hole through the main return oil chamber.

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

[0035] A connecting rod is threaded between the two end caps, and a guide sleeve that restricts the movement of the piston rod is fixedly connected to one of the end caps away from the cylinder body.

[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 reaches the end of its stroke, the magnetic repulsion force pushes the second magnet to move inside the end cap, causing the second magnet to move closer to the third magnet. This continues until the oil return hole on the surface of the second magnet is fitted onto the outside of the end cap. The end cap then seals the oil return holes sequentially until all the oil return holes are blocked. At the same time, the main oil return chamber is also blocked, and the remaining hydraulic oil flows back to the oil injection hole through the auxiliary oil return chamber. This means that the main oil return chamber is gradually closed. Compared to the original method of directly closing the main oil return chamber, the pressure fluctuations and instantaneous pressure differences are significantly reduced, thereby reducing the impact of hydraulic oil on the inside of the cylinder. This reduces damage to the inside of the cylinder and also reduces the vibration amplitude of the entire module during linear extension and retraction, making the linear extension and retraction motion more stable and improving the accuracy of the linear extension and retraction motion. Attached Figure Description

[0038] Figure 1 A schematic diagram of the overall structure provided according to an embodiment of the present invention is shown;

[0039] Figure 2 A schematic diagram of a hydraulic cylinder buffer assembly structure in the prior art according to an embodiment of the present invention is shown;

[0040] Figure 3 A schematic cross-sectional view of the cylinder block structure provided according to an embodiment of the present invention is shown;

[0041] Figure 4 The present invention provides an embodiment of the invention. Figure 3 Enlarged view of point A in the middle;

[0042] Figure 5 A schematic cross-sectional view of the end cap structure provided according to an embodiment of the present invention is shown;

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

[0044] Figure 7 The present invention provides an embodiment of the invention. Figure 6 Enlarged view at point B in the middle;

[0045] Figure 8 A partial structural schematic diagram of an anti-rebound assembly provided according to an embodiment of the present invention is shown.

[0046] Legend:

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

[0048] 20. Oil return assembly; 21. Main oil return chamber; 22. Secondary oil return chamber; 23. Control valve;

[0049] 30. Buffer assembly; 31. First magnet; 32. Sleeve; 33. Second magnet; 34. Oil return hole; 35. Third magnet; 36. End cap; 37. Slide groove; 38. Slider;

[0050] 40. Anti-rebound assembly; 41. Oil guide cavity; 42. Suction cup; 43. Rectangular airbag; 44. Cylindrical airbag; 45. Rubber sleeve; 46. Movable groove; 47. Piezoelectric ceramic; 48. Pressure block; 49. Spring. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] like Figures 1-7 As shown, the present invention provides a hydraulic linear telescopic module, comprising a cylinder body 10;

[0053] End caps 11 are movably connected to both ends of the cylinder body 10 for sealing the cylinder body 10;

[0054] Oil injection hole 12 is opened on the surface of end cover 11 and communicates with the inside of cylinder 10;

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

[0056] A connecting rod 13 is threaded between the two end caps 11, and a guide sleeve 14 that restricts the movement of the piston rod 16 is fixedly connected to the side of one end cap 11 away from the cylinder body 10.

[0057] The oil return assembly 20 includes a main oil return chamber 21 opened on the side of the end cover 11 near the cylinder body 10, and a secondary oil return chamber 22 opened on the side of the end cover 11 near the cylinder body 10. The secondary oil return chamber 22 is provided with a regulating valve 23, and the secondary oil return chamber 22 is connected to the oil injection hole 12 through the main oil return chamber 21.

[0058] It also includes a buffer assembly 30 located between the piston cylinder 15 and the end cap 11 on both sides to reduce the impact force of 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 located inside the main oil return chamber 21 on the side near the cylinder body 10 and has an oil return hole 34 on its surface.

[0061] The third magnet 35 is fixedly connected to the side of the main oil return chamber 21 away from the cylinder body 10.

[0062] The end cap 36 is fixedly connected to the side of the third magnet 35 near the cylinder body 10, and the length of the end cap 36 is distributed in a multi-component arithmetic sequence with the same number of components.

[0063] The first magnet 31 and the second magnet 33 have the same magnetic poles on the side closest to each other. After the second magnet 33 moves towards the third magnet 35, the oil return hole 34 on its surface is blocked by the end cap 36 in turn.

[0064] The second magnet 33 and the third magnet 35 have the same magnetic poles on the side closest to each other. A sleeve 32 is fixedly connected to the inside of the main oil return chamber 21 on the side close to the cylinder 10. A slider 38 is fixedly connected to the ring side of the second magnet 33. A groove 37 matching the slider 38 is opened on the inner side of the sleeve 32.

[0065] Specifically, firstly, the oil filling hole 12 on the end cap 11 is connected to the oil tank through an oil pipe. During operation, the hydraulic oil inside the oil tank is introduced into the inside of the right end cap 11 through the oil pipe and the oil filling hole 12 by the oil pump. The hydraulic oil enters the inside of the cylinder 10 through the main return oil chamber 21. With the injection of hydraulic oil, the piston cylinder 15 is pushed from right to left under the action of hydraulic pressure, thereby pushing the piston rod 16 out of the cylinder 10. During the movement, 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 of the inside of the cylinder 10, the hydraulic oil inside the oil tank is then introduced into the oil filling hole 12 on the left side by the oil pump. At this time, under the action of hydraulic pressure, the piston cylinder 15 is pushed to move from left to right inside the cylinder 10, thereby driving the piston rod 16 to retract into the inside of the cylinder 10. At the same time, the hydraulic oil originally located on the right side of the piston cylinder 15 is pushed back into the oil tank. This process is repeated to form a hydraulic linear extension and retraction motion.

[0066] To prevent the piston inside the hydraulic cylinder from impacting the cylinder head due to inertia or load force when it reaches the end of its stroke, thereby causing noise, vibration and mechanical damage, which would affect the accuracy of the linear telescopic motion, a buffer assembly 30 is installed inside the cylinder.

[0067] When the piston cylinder 15 reaches the end of its 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 of the first magnet 31 and the second magnet 33 are the same on the side they approach, the magnetic repulsion force pushes the second magnet 33 to move inside the end cap 11, causing the second magnet 33 to move closer to the third magnet 35, until the oil return hole 34 on the surface of the second magnet 33 is fitted onto the outside of the end cap 36, and the end cap 36 seals the oil return hole 34. Since the length of the end cap 36 is distributed in a multi-component arithmetic sequence with the same number of components, the oil return hole 34 on the surface of the second magnet 33 is blocked. 4 will be blocked sequentially until all return oil holes 34 are blocked, and the main return oil chamber 21 is also blocked at the same time. The remaining hydraulic oil will flow back to the oil injection hole 12 through the auxiliary return oil chamber 22. In this way, the main return oil chamber 21 can be closed gradually. Compared with the original method of directly closing the main return oil chamber 21, the pressure fluctuation and instantaneous pressure difference are greatly reduced, thereby reducing the impact of hydraulic oil on the inside of the cylinder 10. While reducing the damage to the inside of the cylinder 10, it also reduces the vibration amplitude of the entire module during linear extension and retraction, making the linear extension and retraction motion more stable and improving the accuracy of the linear extension and retraction motion.

[0068] In addition, when the second magnet 33 is displaced, its outer slider 38 moves along the groove 37 on the inner wall of the sleeve 32. On the one hand, the slider 38 and the groove 37 restrict the second magnet 33 from rotating when it is displaced. On the other hand, the slider 38 and the groove 37 increase the resistance when the second magnet 33 is displaced, so that the inertia of the piston cylinder 15 is reduced when it reaches the end of its stroke. This reduces the impact force of the end cap 36 when it blocks the oil return hole 34, thereby reducing the wear between the end cap 36 and the inner wall of the oil return hole 34, ensuring the sealing effect of the buffer assembly 30, improving the service life of the buffer assembly 30, and reducing maintenance costs.

[0069] Furthermore, since the magnetic poles of the second magnet 33 and the third magnet 35 are the same on the side closest to each other, the second magnet 33 is also resisted by magnetic repulsion when it moves towards the third magnet 35. This further cancels the inertia of the piston cylinder 15 when it reaches the end of its stroke, which reduces the wear of the buffer assembly 30 and reduces the buffer speed. This reduces the pressure fluctuation and instantaneous pressure difference inside the cylinder 10, and improves the service life of the cylinder 10 and the stability and accuracy of the linear telescopic motion.

[0070] like Figure 3 and Figures 6-8 As shown, the main return oil chamber 21 is provided with an anti-rebound assembly 40 to prevent the piston cylinder 15 from shifting after buffering. The anti-rebound assembly 40 includes a suction cup 42 fixedly connected to the edge of the first magnet 31 near the end cap 11, and an oil guide chamber 41 is provided at the edge of the sleeve 32.

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

[0072] The cylindrical airbag 44 is connected to the rectangular airbag 43 and is filled with air. The elasticity of the cylindrical airbag 44 is less than that of the rectangular airbag 43.

[0073] The anti-rebound assembly 40 also includes a rubber sleeve 45 fitted onto the outside of the end cap 36, and the inside of the rubber sleeve 45 is filled with electrorheological fluid. The end cap 36 has a movable groove 46 on the side near the cylinder 10, and a piezoelectric ceramic 47 is fixedly connected to the inside of the movable groove 46 on the side away from the cylinder 10. A pressure block 48 is slidably connected to the inside of the movable groove 46 on the side near the cylinder 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 movable groove 46 are sealed with a sealing ring, and the elastic force of the spring 49 is greater than the resistance encountered by the pressure block 48 when it is displaced.

[0075] Specifically, pressure changes and sudden load changes in the hydraulic system can affect the movement of the cylinder and may cause the cylinder to rebound during buffering. If the 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 reaches the end of its stroke and undergoes buffering, the suction cup 42 on its side first magnet 31 will contact the sleeve 32 and generate compression, causing the oil inside the suction cup 42 to be squeezed out. At this time, the suction cup 42 firmly adheres to the surface of the sleeve 32, thus preventing the piston cylinder 15 from rebounding at the moment of rebound, thereby ensuring the stability of the hydraulic linear telescopic module during operation 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 a return oil passage, and after buffering, it enters through the oil injection hole 12. Hydraulic oil inside the end cap 11 enters the oil guide cavity 41 and pushes 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 is displaced, it will squeeze the rectangular air bladder 43, so that the gas inside the rectangular air bladder 43 enters the cylindrical air bladder 44, thereby causing the cylindrical air bladder 44 to expand. The expanded cylindrical air bladder 44 blocks the oil guide cavity 41, ensuring that the suction cup 42 is in a sealed state after contacting the oil guide cavity 41 on the surface of the sleeve 32, thereby improving the adhesion of the suction cup 42 during the anti-rebound process.

[0077] In addition, when the return oil hole 34 is fitted onto the outside of the end cap 36, the end cap 36 is wrapped with a rubber sleeve 45, and the rubber sleeve 45 is filled with electrorheological fluid. Therefore, during buffering, a contact area will be formed between the second magnet 33 and the end cap 36, which will be squeezed and deformed. The rubber sleeve 45 on both sides of the contact area expands to form a seal on the contact area, which improves the sealing effect on the main return oil chamber 21 during buffering. At the moment of buffering, the first magnet 31 hits the pressure block 48 set on one side of the end cap 36, causing the pressure block 48 to move along the inside of the movable groove 46 and hit the piezoelectric ceramic 47. The piezoelectric ceramic 47 generates an instantaneous current after being hit. The pressure block 48, as a conductor, guides the current to the electrorheological fluid. The electrorheological fluid will solidify instantly after being energized. The instantaneous solidification of the electrorheological fluid prevents the second magnet 33 from moving back, thereby preventing the main return oil chamber 21 from being opened during buffering rebound. This avoids buffering interruption caused by buffering rebound and ensures that the buffering effect of the hydraulic cylinder is not affected.

[0078] Working principle: First, the oil injection hole 12 on the end cover 11 is connected to the oil tank through an oil pipe. During operation, the hydraulic oil inside the oil tank is introduced into the inside of the right end cover 11 through the oil pipe and the oil injection hole 12 by the oil pump. The hydraulic oil enters the inside of the cylinder 10 through the main return oil chamber 21. With the injection of hydraulic oil, the piston cylinder 15 is pushed from right to left under the action of hydraulic pressure, thereby pushing the piston rod 16 out of the cylinder 10. During the movement, 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 of the inside of the cylinder 10, the piston cylinder 15 moves to the end of its 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 of the first magnet 31 and the second magnet 33 are the same on the side that are close together, the magnetic repulsion force pushes the second magnet 33 against the end cover 11. The internal displacement causes the second magnet 33 to move closer to the third magnet 35 until the oil return hole 34 on the surface of the second magnet 33 is fitted onto the outside of the end cap 36. The end cap 36 blocks the oil return hole 34. Since the length of the end cap 36 is distributed in a multi-component arithmetic sequence with the same number of components, the oil return holes 34 on the surface of the second magnet 33 will be blocked in sequence. After all the oil return holes 34 are blocked, the main oil return chamber 21 is also blocked at the same time. The remaining hydraulic oil flows back to the oil injection hole 12 through the auxiliary oil return chamber 22. Then, the hydraulic oil inside the oil tank is pumped into the oil injection hole 12 on the left side by the oil pump. At this time, under the action of hydraulic pressure, the piston cylinder 15 is pushed to move from left to right inside the cylinder 10, thereby driving the piston rod 16 to retract into the inside of the cylinder 10. At the same time, the hydraulic oil originally located on the right side of the piston cylinder 15 is pushed back into the oil tank. This reciprocating motion forms a hydraulic linear extension and retraction motion.

[0079] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hydraulic linear telescopic module, comprising a cylinder (10); End caps (11) are movably connected to both ends of the cylinder body (10) for sealing the cylinder body (10); The oil injection hole (12) is opened on the surface of the end cap (11) and communicates with the inside of the cylinder (10); The piston rod (16) is slidably connected to the inside of the cylinder (10), and the piston cylinder (15) is fixedly connected to its surface. The oil return assembly (20) includes a main oil return chamber (21) opened on the side of the end cap (11) near the cylinder body (10), and a secondary oil return chamber (22) opened on the side of the end cap (11) near the cylinder body (10). Its features are, It also includes a buffer assembly (30) located between the piston cylinder (15) and the end cap (11) to reduce the impact force of hydraulic oil during buffering. The first magnet (31) is fixedly connected to both sides of the piston cylinder (15); The second magnet (33) is located inside the main oil return chamber (21) on the side near the cylinder body (10) and has an oil return hole (34) on its surface. The third magnet (35) is fixedly connected to the side of the main oil return chamber (21) away from the cylinder body (10); The end cap (36) is fixedly connected to the side of the third magnet (35) near the cylinder (10), and the length of the end cap (36) is distributed in a multi-component arithmetic sequence with the same number of components; A sleeve (32) is fixedly connected to the inside of the main oil return chamber (21) near the cylinder body (10), and a slider (38) is fixedly connected to the ring side of the second magnet (33). A groove (37) matching the slider (38) is opened on the inner side of the sleeve (32). The main return oil chamber (21) is provided with an anti-rebound assembly (40) to prevent the piston cylinder (15) from shifting after buffering. The anti-rebound assembly (40) includes a suction cup (42) fixedly connected to the edge of the first magnet (31) near the end cap (11). An oil guide chamber (41) is provided at the edge of the sleeve (32). A rectangular airbag (43) is fixedly connected inside the slide groove (37), and a cylindrical airbag (44) is fixedly connected on the side of the rectangular airbag (43) away from the cylinder (10). The cylindrical airbag (44) extends through the slide groove (37) into the interior of the oil guide chamber (41). The cylindrical airbag (44) is connected to the rectangular airbag (43) and is filled with air. The elasticity of the cylindrical airbag (44) is less than that of the rectangular airbag (43). The anti-rebound assembly (40) also includes a rubber sleeve (45) fitted onto the outside of the end cap (36), and the inside of the rubber sleeve (45) is filled with electrorheological fluid. The end cap (36) has a movable groove (46) on the side near the cylinder (10), and a piezoelectric ceramic (47) is fixedly connected to the inside of the movable groove (46) away from the cylinder (10). A pressure block (48) is slidably connected to the inside of the movable groove (46) near the cylinder (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. The pressure block (48) and the movable groove (46) are sealed with a sealing ring, and the elastic force of the spring (49) is greater than the resistance encountered when the pressure block (48) is displaced.

2. The hydraulic linear telescopic module according to claim 1, characterized in that, The first magnet (31) and the second magnet (33) have the same magnetic poles on the side that are close to each other. After the second magnet (33) moves towards the third magnet (35), the oil return hole (34) on its surface is blocked by the end cap (36) in turn.

3. A hydraulic linear telescopic module according to claim 1, characterized in that, The second magnet (33) and the third magnet (35) have the same magnetic poles on the side closest to each other.

4. A hydraulic linear telescopic module according to claim 1, characterized in that, The auxiliary oil return chamber (22) is equipped with a regulating valve (23), and the auxiliary oil return chamber (22) is connected to the oil injection hole (12) through the main oil return chamber (21).

5. A hydraulic linear telescopic module according to claim 1, characterized in that, A connecting rod (13) is threaded between the two end caps (11), and a guide sleeve (14) that restricts the movement of the piston rod (16) is fixedly connected to one side of the end cap (11) away from the cylinder body (10).

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