Buffer type hydraulic oil cylinder

Abstract

The buffering type hydraulic oil cylinder comprises a cylinder barrel, a rear end buffering mechanism, a front end buffering mechanism and a sealing mechanism, a front end cover is installed at one end of the cylinder barrel, a rear end cover is installed at the other end of the cylinder barrel, a limiting barrel is integrally formed on the inner wall of the rear end cover, and a piston rod is installed in the cylinder barrel through a piston block; through the synergistic effect of the front-end buffering mechanism and the rear-end buffering mechanism, the buffering effect of the piston rod in the extending and retracting process is achieved, impact is effectively reduced, meanwhile, by adjusting the front-end buffering mechanism and the rear-end buffering mechanism, the buffering triggering opportunity and the buffering strength of the piston rod can be effectively controlled, the buffering performance is improved, and the service life of the piston rod is prolonged. Buffer triggering opportunities are dynamically adjusted under different demand scenes, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic cylinders, and specifically, to a buffer type hydraulic cylinder. Background Art

[0002] A buffer type hydraulic cylinder is a hydraulic actuator with a buffer mechanism, which is widely used in the fields of machinery, engineering equipment and industrial automation. Its main function is to slow down the impact and reduce the vibration through the built-in buffer device when the piston of the hydraulic cylinder moves to the end of the stroke, improve the stability and service life of the equipment, and is suitable for scenarios that require precise positioning or high-speed movement, such as machine tools, injection molding machines and lifting equipment.

[0003] The existing hydraulic or pneumatic buffer mechanisms usually use fixed springs or damping sleeves for buffering, and cannot dynamically adjust the buffer trigger timing and buffer force according to different working conditions, resulting in insufficient or excessive buffer effects in high-load or high-speed movement scenarios or low-speed movement scenarios, affecting the operation stability and service life of the equipment. Summary of the Invention

[0004] The purpose of the present invention is to provide a buffer type hydraulic cylinder to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A buffer type hydraulic cylinder, comprising a cylinder barrel, a rear-end buffer mechanism, a front-end buffer mechanism and a sealing mechanism; a front-end cover is installed at one end of the cylinder barrel, and a rear-end cover is installed at the other end. A limiting cylinder is integrally formed on the inner wall of the rear-end cover, and a piston rod is installed inside the cylinder barrel through a piston block.

[0006] Among them, a rear-end buffer mechanism is installed inside the rear-end cover, and the rear-end buffer mechanism is used for buffering the retraction displacement of the piston rod. There is a front-end buffer mechanism inside the front-end cover, and the front-end buffer mechanism is used for buffering the extension displacement of the piston rod. Sealing mechanisms are installed on both the front-end cover and the limiting cylinder.

[0007] Preferably, the front-end buffer mechanism includes no less than four first threaded rods, the first threaded rods penetrate through the front-end cover, and arc-shaped pressing blocks are installed at the ends of the first threaded rods through bearings. An active ring is slidably installed on the inner wall of the cylinder barrel, and a first spring is embedded on one side of the active ring, and the end of the first spring away from the active ring abuts against one side of the arc-shaped pressing block.

[0008] Preferably, the rear buffer mechanism includes a second threaded rod which penetrates through the rear end cover. One end of the second threaded rod penetrates through the limiting cylinder and is provided with a disc through a bearing. A second spring is embedded on one side of the disc. A damping sleeve is slidably mounted on the outer wall of the disc, and the second spring is located inside the damping sleeve.

[0009] Preferably, the sealing mechanism includes a first O-ring, a second O-ring, a first Y-ring and a second Y-ring. The first O-ring and the first Y-ring are fixedly connected to the inner wall of the limiting cylinder in sequence, and the second O-ring and the second Y-ring are fixedly connected to the inner wall of the front end cover in sequence.

[0010] Preferably, a chute is provided on the outer wall of the disc, and an annular convex rib is provided on the inner wall of the damping sleeve. The damping sleeve is slidably mounted inside the chute through the annular convex rib.

[0011] Preferably, a wiper is embedded in the end opening of the front end cover.

[0012] Preferably, a first oil inlet hole is provided on the front end cover, and a second oil inlet hole is provided on the rear end cover.

[0013] Preferably, a connecting plate is welded to the outer wall of the rear end cover, and a threaded hole is provided on the connecting plate.

[0014] Preferably, the external threads of the first threaded rod and the second threaded rod are both NPT type threads.

[0015] Preferably, a groove is provided on the outer wall of the rear end cover, and the groove is at the same axis as the second threaded rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: through the synergistic effect of the front buffer mechanism and the rear buffer mechanism, the present invention realizes the buffering effect during the extension and retraction of the piston rod, effectively reducing the impact. At the same time, by adjusting the front buffer mechanism and the rear buffer mechanism, the buffering trigger timing and buffering force of the piston rod can be effectively controlled, improving the buffering performance, dynamically adjusting the buffering trigger timing for different demand scenarios, and prolonging the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the buffer type hydraulic cylinder according to an embodiment of the present invention;

[0018] Figure 2 is a schematic structural diagram of another perspective of the buffer type hydraulic cylinder according to an embodiment of the present invention;

[0019] Figure 3 is a schematic cross-sectional structural diagram of the buffer type hydraulic cylinder according to an embodiment of the present invention;

[0020] Figure 4 For the embodiment of the present invention Figure 3 The enlarged structural schematic diagram of part A in it;

[0021] Figure 5 For the embodiment of the present invention Figure 3 The enlarged structural schematic diagram of part B in it;

[0022] Figure 6 The structural schematic diagram of the first threaded rod, the first spring and the movable ring in the buffer type hydraulic cylinder of the embodiment of the present invention.

[0023] In the figure: 1, cylinder barrel; 2, rear end cover; 3, front end cover; 4, piston rod; 5, wiper; 6, connecting plate; 7, threaded hole; 8, first oil inlet hole; 9, first threaded rod; 10, second oil inlet hole; 11, second threaded rod; 12, groove; 13, limiting cylinder; 14, first O-ring seal; 15, first Y-ring seal; 16, piston block; 17, movable ring; 18, second O-ring seal; 19, second Y-ring seal; 20, first spring; 21, arc-shaped pressing block; 22, disc; 23, damping sleeve; 24, sliding groove; 25, second spring. Specific embodiments

[0024] 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 shall fall within the protection scope of the present invention.

[0025] Please refer to Figure 1 , the embodiment of the present invention provides a buffer type hydraulic cylinder, including: cylinder barrel 1, rear end buffer mechanism, front end buffer mechanism and sealing mechanism.

[0026] Among them, as Figures 1 - 3 shown, one end of the cylinder barrel 1 is installed with a front end cover 3, the other end is installed with a rear end cover 2, the inner wall of the rear end cover 2 is integrally formed with a limiting cylinder 13, the front end cover 3 is provided with a first oil inlet hole 8, the rear end cover 2 is provided with a second oil inlet hole 10, the piston rod 4 is installed inside the cylinder barrel 1 through the piston block 16, and the end opening of the front end cover 3 is embedded with a wiper 5. During use, hydraulic oil is injected through the first oil inlet hole 8 or the second oil inlet hole 10 to drive the piston rod 4 to reciprocate in the cylinder barrel 1 by the piston block 16, and the wiper 5 can wipe the outer wall when the piston rod 4 expands and contracts.

[0027] Furthermore, a connecting plate 6 is welded to the outer wall of the rear end cover 2. Threaded holes 7 are provided on the connecting plate 6. The connecting plate 6 can be fixedly installed in the equipment that needs hydraulic drive by passing a fixing member through the threaded holes 7.

[0028] In this embodiment, as Figures 1 - 5 shown, a rear end buffer mechanism is installed inside the rear end cover 2. The rear end buffer mechanism includes a second threaded rod 11. The second threaded rod 11 penetrates the rear end cover 2. One end of the second threaded rod 11 penetrates a limiting cylinder 13 and is installed with a disc 22 through a bearing. A second spring 25 is embedded on one side of the disc 22. A damping sleeve 23 is slidably installed on the outer wall of the disc 22. The second spring 25 is located inside the damping sleeve 23.

[0029] When the rear end buffer mechanism is in use, the piston rod 4 retracts and the rear end buffer mechanism starts to work. At this time, the piston block 16 moves backward and contacts the damping sleeve 23. The damping sleeve 23 is compressed under the action of the second spring 25, so that the buffering force gradually increases, and finally the piston rod 4 stops smoothly. Among them, by rotating the second threaded rod 11 in the rear end buffer mechanism, the positions of the disc 22 and the damping sleeve 23 can be pushed closer to or farther away from the piston block 16, so that the piston block 16 can approach and squeeze the damping sleeve 23 faster or slower, thereby changing the buffering trigger timing when the piston rod 4 contracts and resets inward, and increasing or shortening the buffering trigger time.

[0030] Furthermore, a chute 24 is provided on the outer wall of the disc 22, and an annular convex rib is provided on the inner wall of the damping sleeve 23. The damping sleeve 23 can be slidably installed inside the chute 24 through the annular convex rib. By arranging the damping sleeve 23 outside the second spring 25, the buffering effect can be further increased.

[0031] In this embodiment, as Figures 1 - 6 shown, there is a front end buffer mechanism inside the front end cover 3. The front end buffer mechanism includes no less than four first threaded rods 9. The first threaded rods 9 penetrate the front end cover 3, and arc-shaped pressing blocks 21 are installed at the ends of the first threaded rods 9 through bearings. A movable ring 17 is slidably installed on the inner wall of the cylinder barrel 1. A first spring 20 is embedded on one side of the movable ring 17. One end of the first spring 20 away from the movable ring 17 abuts against one side of the arc-shaped pressing block 21.

[0032] When the front-end buffer mechanism is in use, the piston rod 4 extends outwards. The piston block 16 pushes the movable ring 17 to move forward, causing the first spring 20 to be squeezed and deformed, gradually slowing down the extension speed of the piston rod 4, thereby reducing the impact force and achieving the buffering effect. Among them, by rotating the first threaded rod 9 in the front-end buffer mechanism, the arc-shaped pressing block 21 can be pushed to move. The arc-shaped pressing block 21 pushes the first spring 20 and the movable ring 17 towards the rear end cover 2, enabling the piston block 16 to approach and squeeze the first spring 20 more quickly when it extends outwards. In addition, the first threaded rod 9 can also move towards the outside of the front end cover 3, causing the piston block 16 to push the movable ring 17 towards the front end cover 3 when it extends outwards, enabling the piston block 16 to approach and squeeze the first spring 20 more slowly when it extends outwards.

[0033] As Figure 3 shown, sealing mechanisms are installed on both the front end cover 3 and the limiting cylinder 13. The sealing mechanism includes a first O-ring 14, a second O-ring 18, a first Y-ring 15, and a second Y-ring 19. The first O-ring 14 and the first Y-ring 15 are sequentially and fixedly connected to the inner wall of the limiting cylinder 13, and the second O-ring 18 and the second Y-ring 19 are sequentially and fixedly connected to the inner wall of the front end cover 3. The sealing mechanism is fixed to the inner wall of the limiting cylinder 13 through the first O-ring 14 and the first Y-ring 15, and the second O-ring 18 and the second Y-ring 19 are fixed to the inner wall of the front end cover 3, realizing the sealing of the piston rod 4 and the second threaded rod 11 inside the cylinder barrel 1, preventing leakage, and improving the sealing performance.

[0034] It should be noted that the external threads of the first threaded rod 9 and the second threaded rod 11 are both NPT type threads, and the NPT type threads have high sealing performance.

[0035] In order to prevent the second threaded rod 11 on the rear end cover 2 from being directly exposed outside, a groove 12 is provided on the outer wall of the rear end cover 2. The groove 12 is located on the same axis as the second threaded rod 11. Therefore, the second threaded rod 11 can be rotationally adjusted within the groove 12.

[0036] Summarize and sort out the working steps of this solution according to the above technical solution: When the present invention is in use, the piston rod 4 is driven by the piston block 16 to reciprocate in the cylinder barrel 1, and buffering is achieved at both end strokes. When the piston rod 4 extends outwards, the piston block 16 pushes the movable ring 17 to move forward, causing the first spring 20 to be compressed and deformed, gradually slowing down the extending speed of the piston rod 4, thereby reducing the impact force and achieving the buffering effect. Among them, by rotating the first threaded rod 9 in the front-end buffering mechanism, the arc-shaped pressing block 21 can be pushed to move, and the arc-shaped pressing block 21 pushes the first spring 20 and the movable ring 17 towards the rear end cover 2, so that when the piston block 16 extends outwards, it can approach and compress the first spring 20 faster. In addition, the first threaded rod 9 can also move towards the outside of the front end cover 3, so that when the piston block 16 extends outwards, it pushes the movable ring 17 towards the front end cover 3, so that when the piston block 16 extends outwards, it can approach and compress the first spring 20 more slowly, thereby changing the buffering trigger timing when the piston rod 4 extends outwards, and increasing or shortening the buffering trigger time.

[0037] When the piston rod 4 retracts, the rear-end buffering mechanism starts to work. At this time, the piston block 16 moves backward and contacts the damping sleeve 23. The damping sleeve 23 is compressed under the action of the second spring 25, so that the buffering force gradually increases, and finally the piston rod 4 stops smoothly. Among them, by rotating the second threaded rod 11 in the rear-end buffering mechanism, the positions of the disc 22 and the damping sleeve 23 can be pushed to approach or move away from the piston block 16, so that the piston block 16 can approach and compress the damping sleeve 23 faster or slower, thereby changing the buffering trigger timing when the piston rod 4 retracts and resets, and increasing or shortening the buffering trigger time.

[0038] In summary: Through the coordinated action of the front-end buffering mechanism and the rear-end buffering mechanism, the present invention realizes the buffering effect of the piston rod 4 during the extension and retraction processes, effectively reducing the impact. At the same time, by adjusting the front-end buffering mechanism and the rear-end buffering mechanism, the buffering trigger timing and buffering force of the piston rod 4 can be effectively controlled, improving the buffering performance, dynamically adjusting the buffering trigger timing for different demand scenarios, and increasing the service life of the equipment.

[0039] Parts not involved in the present invention are the same as or can be implemented using the prior art. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A buffer hydraulic cylinder, comprising a cylinder barrel (1), a rear end buffer mechanism, a front end buffer mechanism and a sealing mechanism, characterized in that: A front end cover (3) is installed at one end of the cylinder barrel (1), and a rear end cover (2) is installed at the other end; a limiting cylinder (13) is integrally formed on the inner wall of the rear end cover (2); a piston rod (4) is installed inside the cylinder barrel (1) via a piston block (16); A rear end buffer mechanism is installed inside the rear end cover (2), and the rear end buffer mechanism is used for retraction displacement buffering of the piston rod (4); a front end buffer mechanism is installed inside the front end cover (3), and the front end buffer mechanism is used for extension displacement buffering of the piston rod (4); and sealing mechanisms are installed on the front end cover (3) and the limiting cylinder (13).

2. A buffer hydraulic cylinder according to claim 1, characterized in that: The front end buffer mechanism comprises no less than four first threaded rods (9), the first threaded rods (9) passing through the front end cover (3), and the end of the first threaded rod (9) is installed with an arc-shaped pressure block (21) through a bearing, and a movable ring (17) is slidably installed on the inner wall of the cylinder (1), and a first spring (20) is embedded on one side of the movable ring (17), and one end of the first spring (20) away from the movable ring (17) abuts against one side of the arc-shaped pressure block (21).

3. A buffer hydraulic cylinder according to claim 1, characterized in that: The rear end buffer mechanism comprises a second threaded rod (11), the second threaded rod (11) passes through the rear end cover (2), one end of the second threaded rod (11) passes through the limiting cylinder (13), and a disc (22) is installed through a bearing, a second spring (25) is embedded on one side of the disc (22), a damping sleeve (23) is slidably installed on the outer wall of the disc (22), and the second spring (25) is located inside the damping sleeve (23).

4. The buffer hydraulic cylinder according to claim 1, characterized in that: The sealing mechanism comprises a first O-ring (14), a second O-ring (18), a first Y-ring (15) and a second Y-ring (19); the first O-ring (14) and the first Y-ring (15) are fixedly connected to the inner wall of the limiting cylinder (13) in sequence, and the second O-ring (18) and the second Y-ring (19) are fixedly connected to the inner wall of the front end cover (3) in sequence.

5. The buffer hydraulic cylinder according to claim 3, characterized in that: The outer wall of the disc (22) is provided with a slide groove (24), the inner wall of the damping sleeve (23) is provided with an annular convex ridge, and the damping sleeve (23) is slidably mounted inside the slide groove (24) via the annular convex ridge.

6. The buffer hydraulic cylinder according to claim 1, characterized in that: A wiper (5) is embedded in the end opening of the front end cover (3).

7. The buffer hydraulic cylinder according to claim 1, characterized in that: The front end cover (3) is provided with a first oil inlet hole (8), and the rear end cover (2) is provided with a second oil inlet hole (10).

8. The buffer hydraulic cylinder according to claim 1, characterized in that: A connecting plate (6) is welded to the outer wall of the rear end cover (2), and a threaded hole (7) is provided on the connecting plate (6).

9. The buffer hydraulic cylinder according to claim 1, characterized in that: The external threads of the first threaded rod (9) and the second threaded rod (11) are both NPT type threads.

10. The buffer hydraulic cylinder according to claim 1, characterized in that: The outer wall of the rear end cover (2) is provided with a groove (12), and the groove (12) and the second threaded rod (11) are located on the same axis.

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