A cushioned hydraulic cylinder

Abstract

The application discloses a buffer hydraulic cylinder and belongs to the technical field of hydraulic cylinders. The buffer hydraulic cylinder comprises a cylinder body, a piston plate is slidably arranged in the cylinder body, a piston rod is fixedly arranged on the top wall of the piston plate, an oil pipe is fixedly arranged on the cylinder body, and a buffer assembly is arranged on the cylinder body. The buffer assembly comprises an annular groove arranged on the cylinder body. In the process that the piston plate moves downwards, the vertical rod drives the linkage ring to rotate through the linkage block and the arc-shaped groove, then the communication area between the oil outlet groove and the buffer groove gradually decreases, and the resistance of the hydraulic oil increases, so that the moving speed of the piston plate is reduced, and the buffer purpose is achieved. In the process that the vertical rod moves downwards, the hydraulic oil in the linkage ring can flow to the oil outlet groove through the gap between the vertical rod and the linkage ring, so that the hydraulic oil pressure in the linkage ring is prevented from being too high, the hydraulic cylinder is prevented from being damaged, and the response speed of the hydraulic cylinder is improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder technology, and more specifically, to a buffer hydraulic cylinder. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. A hydraulic cylinder basically consists of a cylinder barrel and cylinder head, a piston and piston rod, a sealing device, a cushioning device, and a venting device. Hydraulic cylinders are divided into single-acting hydraulic cylinders and double-acting hydraulic cylinders; a double-acting hydraulic cylinder has oil in both chambers, and movement in both directions is achieved by oil pressure.

[0003] In hydraulic systems, hydraulic cylinders drive large, heavy components in rapid, linear reciprocating motion. During this process, when the accumulated kinetic energy reaches the cylinder's stroke limit (cylinder seat end), it can cause a violent collision between the piston and the cylinder seat, generating a tremendous impact force. If this impact force is not effectively mitigated, it will directly threaten the structural safety of the hydraulic cylinder and its connecting components, potentially causing damage such as cylinder seat cracking, cylinder deformation, and piston rod bending, accompanied by intense vibration and noise pollution. Furthermore, frequent collisions and impacts shorten the service life of the hydraulic cylinder, accelerate component wear and aging, affect the performance of the entire hydraulic system, reduce accuracy, and slow down response speed.

[0004] To address the aforementioned problems, some solutions have been provided in the prior art. For example, Chinese invention application CN118959396A discloses a buffer hydraulic cylinder. This device, by using a buffer component, a first fixed component, and a second fixed component in conjunction, can effectively slow down the piston's movement speed when the piston moves towards the cylinder seat, thereby achieving the purpose of buffering. However, after the moving block contacts the first limiting block, the hydraulic oil below the moving block cannot flow to the top of the moving block. Then, during the downward movement of the moving block, the hydraulic oil below the moving block will gradually rise, hindering the normal downward movement of the moving block, and even causing the hydraulic cylinder to be damaged due to excessive pressure, thus seriously affecting the response speed of the hydraulic cylinder. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a buffer hydraulic cylinder that can improve the response speed of the hydraulic cylinder.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A buffer pressure cylinder includes a cylinder body, a piston plate slidably mounted inside the cylinder body, a piston rod fixedly mounted on the top wall of the piston plate, an oil pipe fixedly mounted on the cylinder body, and a buffer assembly provided on the cylinder body; The buffer assembly includes an annular groove formed on the cylinder body, and an oil outlet communicating with an oil pipe is formed on the side wall of the annular groove. A first annular plate is fixedly installed on the top wall of the annular groove, and buffer grooves are evenly formed on the first annular plate. A second annular plate is rotatably installed on the top wall of the first annular plate, and oil outlet grooves communicating with the buffer grooves are evenly formed on the second annular plate. A linkage ring is fixedly installed on the second annular plate, and an arc-shaped groove is formed on the linkage ring. A vertical groove communicating with the arc-shaped groove is formed on the linkage ring. A vertical rod is fixedly installed on the bottom wall of the piston plate, and a linkage block cooperating with the arc-shaped groove is provided on the vertical rod. A reset assembly cooperating with the second annular plate is provided on the linkage ring.

[0008] Furthermore, the reset assembly includes a linkage groove formed on the linkage ring, and the linkage groove is connected to the vertical groove. A torque spring is installed between the bottom wall of the linkage ring and the cylinder body.

[0009] Furthermore, a first magnet is embedded in the linkage ring, a horizontal groove is formed on the vertical rod, and the linkage block slides with the horizontal groove. A first spring is installed between the linkage block and the horizontal groove, and a second magnet that repels the first magnet is embedded in the linkage block.

[0010] Furthermore, a filter screen is provided inside the oil outlet, a rotating rod is rotatably mounted on the filter screen, a scraper is fixedly mounted on the rotating rod, a first bevel gear is fixedly mounted on the end of the rotating rod away from the filter screen, and a second bevel gear that meshes with the first bevel gear is fixedly mounted on the linkage ring.

[0011] Furthermore, the cylinder body is provided with an installation groove, a collection box is slidably installed in the installation groove, and the oil outlet is provided with a communication groove communicating with the collection box. A first threaded rod is rotatably installed on the collection box, and the first threaded rod is threadedly engaged with the side wall of the installation groove.

[0012] Furthermore, a sliding groove is provided on the cylinder body, and a sealing plate for sealing the connecting groove is slidably installed in the sliding groove. A second threaded rod that is rotatably connected to the sealing plate is threaded on the side wall of the cylinder body.

[0013] Furthermore, a limiting groove is provided on the cylinder body, and a limiting plate that is fixedly connected to the filter screen is slidably installed in the limiting groove, and a screw is installed between the limiting plate and the cylinder body.

[0014] Furthermore, the ratio of the number of teeth of the first bevel gear to that of the second bevel gear is 1:30.

[0015] Furthermore, knobs are fixedly installed on both the first and second threaded rods.

[0016] Furthermore, a flange is fixedly installed at the end of the oil pipe away from the cylinder body.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By opening an arc groove, the vertical rod drives the linkage ring to rotate through the linkage block and the arc groove during the downward movement of the piston plate. Then the connecting area between the oil outlet groove and the buffer groove gradually decreases and the resistance of the hydraulic oil increases, which reduces the speed of the piston plate movement, thereby achieving the purpose of buffering. During the downward movement of the vertical rod, the hydraulic oil in the linkage ring can flow to the oil outlet groove through the gap between the vertical rod and the linkage ring, thereby avoiding excessive hydraulic oil pressure in the linkage ring, which would damage the hydraulic cylinder and affect the response speed of the hydraulic cylinder, thus improving the response speed of the hydraulic cylinder. (2) By setting a torque spring, when the piston plate is in contact with the second annular plate, the linkage block enters the linkage groove. At this time, the torque spring extends and drives the linkage ring to reset. During the reset process of the linkage ring, the second annular plate is reset. During the reset process of the second annular plate, the oil outlet groove is fully connected with the buffer groove again. Under the action of the first magnet, the second magnet drives the linkage block to disengage from the linkage groove. Thus, after the hydraulic oil flows to the annular groove through the oil pipe and oil outlet, the hydraulic oil can quickly and stably flow into the cylinder through the buffer groove and oil outlet groove, and make the piston plate move upward stably and quickly. This improves the response speed of the hydraulic cylinder while ensuring that the hydraulic oil drives the piston plate to move upward at a uniform speed. (3) By setting up a filter screen, the filter screen can filter the debris in the hydraulic oil during the process of the hydraulic oil passing through the oil outlet. During the rotation of the linkage ring, the second bevel gear is driven to rotate. During the rotation of the second bevel gear, the first bevel gear drives the rotating rod to rotate. During the rotation of the rotating rod, the scraper is driven to rotate. During the rotation of the scraper, the debris on the surface of the filter screen can rotate. Under the action of centrifugal force, the debris enters the collection box through the connecting groove, preventing metal debris from reciprocating inside the hydraulic oil and rubbing against the inner wall of the cylinder, thus damaging the inner wall of the cylinder and affecting the response efficiency of the hydraulic cylinder. This further improves the response efficiency of the hydraulic cylinder. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a cross-sectional view of the present invention; Figure 4 For the present invention Figure 3 Enlarged view at point B in the middle; Figure 5 For the present invention Figure 4 Enlarged view at point C; Figure 6 This is a diagram showing the combination of the linkage block, vertical rod, and second magnet of the present invention. Figure 7 This is a diagram showing the combination of the first annular plate and the second annular plate of the present invention.

[0019] Explanation of the labels in the diagram: 1. Cylinder block; 2. Piston plate; 3. Piston rod; 4. Buffer assembly; 401. Annular groove; 402. Oil outlet; 403. First annular plate; 404. Buffer groove; 405. Second annular plate; 406. Oil outlet groove; 407. Linkage ring; 408. Arc groove; 409. Vertical groove; 410. Vertical rod; 411. Linkage block; 5. Reset assembly; 501. Linkage groove; 502. Torque spring; 503. First magnet; 505. First spring; 506. Second magnet; 601. Filter screen; 602. Rotating rod; 603. Scraper; 604. First bevel gear; 605. Second bevel gear; 606. Collection box; 607. Connecting groove; 608. First threaded rod; 701. Sealing plate; 702. Second threaded rod; 703. Limiting plate; 704. Screw; 8. Knob; 9. Flange; 10. Oil pipe. Detailed Implementation

[0020] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1 to 7 A buffer pressure cylinder includes a cylinder body 1, a piston plate 2 slidably installed inside the cylinder body 1, a piston rod 3 fixedly installed on the top wall of the piston plate 2, an oil pipe 10 fixedly installed on the cylinder body 1, and a buffer assembly 4 provided on the cylinder body 1. The buffer assembly 4 includes an annular groove 401 formed on the cylinder 1, and an oil outlet 402 communicating with the oil pipe 10 is formed on the side wall of the annular groove 401. A first annular plate 403 is fixedly installed on the top wall of the annular groove 401. Buffer grooves 404 are evenly formed on the first annular plate 403. A second annular plate 405 is rotatably installed on the top wall of the first annular plate 403. Oil outlet grooves 406 communicating with the buffer grooves 404 are evenly formed on the second annular plate 405. A linkage ring 407 is fixedly installed on the second annular plate 405. An arc groove 408 is formed on the linkage ring 407. A vertical groove 409 communicating with the arc groove 408 is formed on the linkage ring 407. A vertical rod 410 is fixedly installed on the bottom wall of the piston plate 2. A linkage block 411 cooperating with the arc groove 408 is provided on the vertical rod 410. A reset assembly 5 cooperating with the second annular plate 405 is provided on the linkage ring 407.

[0022] When the hydraulic cylinder is working, hydraulic oil flows into the outlet 402 through the oil pipe 10, and then into the hydraulic cylinder through the outlet 402 and the annular groove 401. Under the action of the hydraulic oil, the piston plate 2 drives the piston rod 3 to move upward. When the hydraulic cylinder contracts, the piston rod 3 drives the piston plate 2 to move downward. During the downward movement of the piston plate 2, the hydraulic oil below the piston plate 2 flows into the annular groove 401 through the outlet groove 406 and the buffer groove 404, and then flows to the outside through the annular groove 401, the outlet 402, and the second oil pipe 10. During the downward movement of the piston plate 2, the linkage block 411 moves downward through the vertical rod 410. During the downward movement of the linkage block 411, it gradually contacts the arc groove 408. At this time, the linkage block 411 drives the linkage ring 407 to rotate through the arc groove 408. During the rotation of the linkage ring 407, the linkage ring 407 rotates through the second oil pipe 10. The second annular plate 405 drives the oil outlet groove 406 to rotate. During the rotation of the oil outlet groove 406, the communication area between the oil outlet groove 406 and the buffer groove 404 gradually decreases. After the linkage block 411 contacts the vertical groove 409, the communication area between the oil outlet groove 406 and the buffer groove 404 reaches its minimum. Then, as the piston plate 2 drives the linkage block 411 to move downward along the vertical groove 409 through the vertical rod 410, the resistance of the hydraulic oil increases, which reduces the speed of the piston plate 2, thereby achieving the purpose of buffering. During the downward movement of the vertical rod 410, the hydraulic oil in the linkage ring 407 can flow to the oil outlet groove 406 through the gap between the vertical rod 410 and the linkage ring 407, thereby avoiding excessive hydraulic oil pressure in the linkage ring 407, which could damage the hydraulic cylinder and affect the response speed of the hydraulic cylinder, thus improving the response speed of the hydraulic cylinder.

[0023] like Figure 4 , Figure 5 , Figure 6As shown, the reset assembly 5 includes a linkage groove 501 formed on the linkage ring 407, and the linkage groove 501 is connected to the vertical groove 409. A torque spring 502 is installed between the bottom wall of the linkage ring 407 and the cylinder 1.

[0024] The linkage ring 407 is embedded with a first magnet 503, the vertical rod 410 is provided with a horizontal groove, and the linkage block 411 is slidably engaged with the horizontal groove. A first spring 505 is installed between the linkage block 411 and the horizontal groove, and a second magnet 506 that repels the first magnet 503 is embedded in the linkage block 411.

[0025] By adopting the above technical solution, the torque spring 502 begins to store force during the rotation of the linkage ring 407. Then, when the piston plate 2 is in contact with the second annular plate 405, the linkage block 411 enters the linkage groove 501. At this time, the torque spring 502 extends and drives the linkage ring 407 to reset. During the reset process of the linkage ring 407, the second annular plate 405 is also reset. During the reset process of the second annular plate 405, the oil outlet groove 406 is fully connected to the buffer groove 404 again. Thus, after the hydraulic oil flows to the annular groove 401 through the oil pipe 10 and the oil outlet 402, the hydraulic oil can quickly and stably flow into the cylinder 1 through the buffer groove 404 and the oil outlet groove 406, and make the piston plate 2 move upward stably and quickly. This improves the response speed of the hydraulic cylinder while ensuring that the hydraulic oil drives the piston plate 2 to move upward at a uniform speed.

[0026] During the process of the torque spring 502 driving the linkage ring 407 to reset, the linkage ring 407 drives the linkage groove 501 to rotate. Then, during the rotation of the linkage groove 501, the linkage block 411 rotates along the linkage groove 501. During the rotation of the linkage ring 407, the first magnet 503 gradually approaches the second magnet 506. After the linkage ring 407 resets, the distance between the first magnet 503 and the second magnet 506 reaches its minimum. At this time, the repulsive force between the first magnet 503 and the second magnet 506 reaches its maximum. Then, under the action of the repulsive force, the second magnet 506 drives the linkage block 411 into the horizontal groove and disengages from the linkage groove 501. At this time, the first spring 505 is compressed and has a tendency to return to its original state, thereby ensuring that the hydraulic oil can normally drive the piston plate 2 to move upward. After the piston plate 2 drives the linkage block 411 to disengage from the linkage ring 407 through the vertical rod 410, the first spring 505 extends and drives the linkage block 411 out of the horizontal groove, thereby ensuring that the linkage block 411 normally drives the linkage ring 407 to rotate.

[0027] like Figure 4As shown, a filter screen 601 is provided inside the oil outlet 402, a rotating rod 602 is rotatably mounted on the filter screen 601, a scraper 603 is fixedly mounted on the rotating rod 602, a first bevel gear 604 is fixedly mounted at the end of the rotating rod 602 away from the filter screen 601, and a second bevel gear 605 that meshes with the first bevel gear 604 is fixedly mounted on the linkage ring 407.

[0028] The cylinder body 1 is provided with an installation groove, in which a collection box 606 is slidably installed. The oil outlet 402 is provided with a connecting groove 607 that communicates with the collection box 606. A first threaded rod 608 is rotatably installed on the collection box 606, and the first threaded rod 608 is threadedly engaged with the side wall of the installation groove.

[0029] By adopting the above technical solution, during the process of hydraulic oil passing through the oil outlet 402, the filter screen 601 can filter the debris in the hydraulic oil. During the rotation of the linkage ring 407, the second bevel gear 605 is driven to rotate. Then, during the rotation of the second bevel gear 605, the first bevel gear 604 drives the rotating rod 602 to rotate. During the rotation of the rotating rod 602, the scraper 603 is driven to rotate. During the rotation of the scraper 603, the debris on the surface of the filter screen 601 can rotate. Under the action of centrifugal force, the debris enters the collection box 606 through the connecting groove 607. This prevents metal debris from reciprocating inside the hydraulic oil and rubbing against the inner wall of the cylinder 1, thus damaging the inner wall of the cylinder 1 and affecting the response efficiency of the hydraulic cylinder, thereby further improving the response efficiency of the hydraulic cylinder.

[0030] like Figure 2 , Figure 4 As shown, a sliding groove is provided on the cylinder body 1, and a sealing plate 701 for sealing the connecting groove 607 is slidably installed in the sliding groove. A second threaded rod 702 that is rotatably connected to the sealing plate 701 is threadedly installed on the side wall of the cylinder body 1.

[0031] A limiting groove is provided on the cylinder body 1, and a limiting plate 703 fixedly connected to the filter screen 601 is slidably installed in the limiting groove, and a screw 704 is installed between the limiting plate 703 and the cylinder body 1.

[0032] By adopting the above technical solution, when the filter screen 601 needs to be replaced, the user can first turn the screw 704 to disengage it from the hydraulic cylinder. Then, the user can remove the damaged filter screen 601 through the limiting plate 703 and replace it with a new filter screen 601. After the filter screen 601 is replaced, the user can fix the limiting plate 703 again with the screw 704. When it is necessary to clean the debris in the collection box 606, the user can first turn the second threaded rod 702, causing the threaded rod to drive the sealing plate 701 to seal the connecting groove 607. Then, the user can... Rotate the first threaded rod 608 to disengage it from the cylinder 1. At this point, the user can remove the collection box 606 and clean the debris inside. After cleaning the debris, the user can reset the collection box 606 and rotate the first threaded rod 608 to fix it again. After fixing the collection box 606, the user can rotate the second threaded rod 702 to disengage the sealing plate 701 from the connecting groove 607, which facilitates the user to replace the filter screen 601 and clean the collection box 606.

[0033] like Figure 4 As shown, the ratio of the number of teeth of the first bevel gear 604 to the number of teeth of the second bevel gear 605 is 1:30.

[0034] By adopting the above technical solution, during the process of the second bevel gear 605 driving the first bevel gear 604 to rotate, by making the ratio of the number of teeth of the first bevel gear 604 to the second bevel gear 605 1:30, the number of rotations and speed of the rotating rod 602 can be increased, thereby improving the cleaning effect of the scraper 603 on the filter screen 601.

[0035] like Figure 2 As shown, knobs 8 are fixedly installed on both the first threaded rod 608 and the second threaded rod 702.

[0036] The oil pipe 10 is fixedly fitted with a flange 9 at the end away from the cylinder 1.

[0037] By adopting the above technical solution, when the user needs to rotate the first threaded rod 608 and the second threaded rod 702, the user can rotate the corresponding first threaded rod 608 or second threaded rod 702 by rotating the knob 8. The user can also connect the oil pipe 10 to the external pipeline through the flange 9, which improves the practicality of the hydraulic cylinder.

[0038] Usage: First, as the piston plate 2 moves downward, the vertical rod 410 drives the linkage block 411 to move downward. As the linkage block 411 moves downward, it gradually contacts the arc groove 408. At this time, the linkage block 411 drives the linkage ring 407 to rotate through the arc groove 408. During the rotation of the linkage ring 407, the second annular plate 405 drives the oil outlet groove 406 to rotate. During the rotation of the oil outlet groove 406, the communication area between the oil outlet groove 406 and the buffer groove 404 gradually decreases. After the linkage block 411 contacts the vertical groove 409, the communication area between the oil outlet groove 406 and the buffer groove 404 reaches its minimum. Then, as the piston plate 2 drives the linkage block 411 to move downward along the vertical groove 409 through the vertical rod 410, the resistance of the hydraulic oil increases, which reduces the speed of the piston plate 2, thereby achieving the purpose of buffering.

[0039] Then, during the rotation of the linkage ring 407, the torque spring 502 begins to store force. Then, when the piston plate 2 is in contact with the second annular plate 405, the linkage block 411 enters the linkage groove 501. At this time, the torque spring 502 extends and drives the linkage ring 407 to reset. During the reset process of the linkage ring 407, the second annular plate 405 is also reset. During the reset process of the second annular plate 405, the oil outlet groove 406 is fully connected with the buffer groove 404 again. Thus, after the hydraulic oil flows through the oil pipe 10 and the oil outlet 402 to the annular groove 401, the hydraulic oil can quickly and stably flow into the cylinder 1 through the buffer groove 404 and the oil outlet groove 406, and make the piston plate 2 move upward stably and quickly.

[0040] Furthermore, during the process of the torque spring 502 driving the linkage ring 407 to reset, the linkage ring 407 drives the linkage groove 501 to rotate. Then, during the rotation of the linkage groove 501, the linkage block 411 rotates along the linkage groove 501. During the rotation of the linkage ring 407, the first magnet 503 gradually approaches the second magnet 506. After the linkage ring 407 resets, the distance between the first magnet 503 and the second magnet 506 reaches its minimum. At this time, the repulsive force between the first magnet 503 and the second magnet 506 reaches its maximum. Then, under the action of the repulsive force, the second magnet 506 drives the linkage block 411 into the horizontal groove and disengages from the linkage groove 501. At this time, the first spring 505 is compressed and has a tendency to recover, thereby ensuring that the hydraulic oil can normally drive the piston plate 2 to move upward. After the piston plate 2 drives the linkage block 411 to disengage from the linkage ring 407 through the vertical rod 410, the first spring 505 extends and drives the linkage block 411 out of the horizontal groove, thereby ensuring that the linkage block 411 normally drives the linkage ring 407 to rotate.

[0041] In addition, as the hydraulic oil passes through the outlet 402, the filter screen 601 can filter the debris in the hydraulic oil. During the rotation of the linkage ring 407, the second bevel gear 605 is driven to rotate. Then, during the rotation of the second bevel gear 605, the first bevel gear 604 drives the rotating rod 602 to rotate. During the rotation of the rotating rod 602, the scraper 603 is driven to rotate. During the rotation of the scraper 603, the debris on the surface of the filter screen 601 can rotate. Then, under the action of centrifugal force, the debris enters the collection box 606 through the connecting groove 607.

[0042] The above description is merely a preferred embodiment of the present invention; however, 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 its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A buffer pressure cylinder, comprising a cylinder body (1), characterized in that: A piston plate (2) is slidably installed inside the cylinder (1), a piston rod (3) is fixedly installed on the top wall of the piston plate (2), an oil pipe (10) is fixedly installed on the cylinder (1), and a buffer assembly (4) is provided on the cylinder (1). The buffer assembly (4) includes an annular groove (401) formed on the cylinder body (1), and an oil outlet (402) communicating with the oil pipe (10) is formed on the side wall of the annular groove (401). A first annular plate (403) is fixedly installed on the top wall of the annular groove (401). Buffer grooves (404) are evenly formed on the first annular plate (403). A second annular plate (405) is rotatably installed on the top wall of the first annular plate (403). An oil outlet communicating with the buffer groove (404) is evenly formed on the second annular plate (405). The second annular plate (405) is fixedly installed with a linkage ring (407), the linkage ring (407) is provided with an arc groove (408), and the linkage ring (407) is provided with a vertical groove (409) communicating with the arc groove (408). The bottom wall of the piston plate (2) is fixedly installed with a vertical rod (410), the vertical rod (410) is provided with a linkage block (411) that cooperates with the arc groove (408), and the linkage ring (407) is provided with a reset assembly (5) that cooperates with the second annular plate (405). The reset assembly (5) includes a linkage groove (501) opened on the linkage ring (407), and the linkage groove (501) is connected to the vertical groove (409). A torque spring (502) is installed between the bottom wall of the linkage ring (407) and the cylinder (1). The linkage ring (407) is provided with a first magnet (503), the vertical rod (410) is provided with a horizontal groove, and the linkage block (411) is slidably engaged with the horizontal groove. A first spring (505) is installed between the linkage block (411) and the horizontal groove, and a second magnet (506) is provided on the linkage block (411) that repels the first magnet (503). During the process of the torque spring 502 driving the linkage ring 407 to reset, the linkage ring 407 drives the linkage groove 501 to rotate. During the rotation of the linkage ring 407, the first magnet 503 gradually approaches the second magnet 506. After the linkage ring 407 resets, the distance between the first magnet 503 and the second magnet 506 reaches its minimum. At this time, the repulsive force between the first magnet 503 and the second magnet 506 reaches its maximum. Then, under the action of the repulsive force, the second magnet 506 drives the linkage block 411 into the horizontal groove and disengages from the linkage groove 501.

2. A buffer pressure cylinder according to claim 1, characterized in that: The oil outlet (402) is provided with a filter screen (601), a rotating rod (602) is rotatably mounted on the filter screen (601), a scraper (603) is fixedly mounted on the rotating rod (602), a first bevel gear (604) is fixedly mounted on the end of the rotating rod (602) away from the filter screen (601), and a second bevel gear (605) that meshes with the first bevel gear (604) is fixedly mounted on the linkage ring (407).

3. A buffer pressure cylinder according to claim 2, characterized in that: The cylinder body (1) is provided with an installation groove, and a collection box (606) is slidably installed in the installation groove. The oil outlet (402) is provided with a connecting groove (607) that communicates with the collection box (606). A first threaded rod (608) is rotatably installed on the collection box (606), and the first threaded rod (608) is threadedly engaged with the side wall of the installation groove.

4. A buffer pressure cylinder according to claim 3, characterized in that: The cylinder body (1) is provided with a sliding groove, and a sealing plate (701) for sealing the connecting groove (607) is slidably installed in the sliding groove. A second threaded rod (702) that is rotatably connected to the sealing plate (701) is threaded on the side wall of the cylinder body (1).

5. A buffer pressure cylinder according to claim 4, characterized in that: A limiting groove is provided on the cylinder (1), and a limiting plate (703) that is fixedly connected to the filter screen (601) is slidably installed in the limiting groove, and a screw (704) is installed between the limiting plate (703) and the cylinder (1).

6. A buffer pressure cylinder according to claim 5, characterized in that: The ratio of the number of teeth of the first bevel gear (604) to the number of teeth of the second bevel gear (605) is 1:

30.

7. A buffer pressure cylinder according to claim 6, characterized in that: A knob (8) is fixedly installed on both the first threaded rod (608) and the second threaded rod (702).

8. A buffer pressure cylinder according to claim 1, characterized in that: The oil pipe (10) is fixedly installed with a flange (9) at the end away from the cylinder (1).

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