Damping type hydraulic oil cylinder with long service life

Abstract

The utility model discloses a shock-absorbing hydraulic oil cylinder with long service life, which comprises a cylinder barrel, a cylinder cover, a guide sleeve, a piston, a piston rod and a shock-absorbing component, the cylinder cover and the guide sleeve are respectively arranged at two ends of the cylinder barrel, the piston is slidably arranged in the cylinder barrel, one end of the piston rod is fixedly connected with the piston after penetrating through the guide sleeve, and the shock-absorbing component is arranged outside the cylinder barrel. The damping assembly comprises a follower, a pressing plate, fixing plates and elastic pieces, the follower is fixedly connected with the piston rod, the pressing plate is fixedly connected with the follower, the two fixing plates are fixedly arranged at the two ends of the cylinder barrel respectively, the pressing plate is located between the two fixing plates, and the elastic piece capable of stretching out and drawing back in the moving direction of the pressing plate is arranged between each fixing plate and the pressing plate. According to the long-service-life damping type hydraulic oil cylinder, the damping assembly is arranged outside the cylinder barrel, machining is facilitated, meanwhile, the situation that the damping assembly is corroded and damaged due to contact with pressure oil is prevented, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a long-life shock-absorbing hydraulic cylinder. Background Art

[0002] A hydraulic cylinder is an actuator that converts hydraulic energy into mechanical energy. It is mainly used to achieve reciprocating motion. Its working principle is that the pressure is evenly transmitted in a closed liquid. The piston is driven to move by changing the pressure of the liquid, thereby achieving mechanical reciprocating motion or swinging motion. A hydraulic cylinder generally includes a cylinder barrel, a cylinder head, a guide sleeve, a piston and a piston rod. The cylinder head and the guide sleeve are respectively installed at the opposite ends of the cylinder barrel. The piston is slidably arranged in the cylinder barrel, and one end of the piston rod is fixedly connected to the piston after passing through the guide sleeve. When working, pressurized oil is injected into the cavities on both sides of the piston in the cylinder barrel to drive the piston to reciprocate.

[0003] In specific use, in order to prevent the piston rod from moving to the extreme position and colliding with the cylinder barrel, causing severe vibration and leading to failure of the hydraulic cylinder, a shock-absorbing structure is generally provided on the hydraulic cylinder to alleviate the vibration caused by the piston rod colliding with the cylinder barrel. The shock-absorbing structure on the hydraulic cylinder can be found in the Chinese patent document with publication number CN219754952U, which discloses a shock-absorbing hydraulic cylinder assembly, which is provided with an anti-collision bottom component at the bottom of the cylinder barrel and an anti-collision top component near the cylinder head inside the cylinder barrel, so as to alleviate the impact of the piston on the bottom of the cylinder and the cylinder head during movement. However, the inventors have discovered that there are many problems in the manufacture and use of the above-mentioned hydraulic cylinder. During manufacture, the anti-collision bottom assembly and the anti-collision top assembly are both arranged inside the cylinder barrel, which brings many inconveniences to processing due to the small operating space. During use, since the inside of the cylinder barrel is filled with pressurized oil, the above-mentioned anti-collision structure is always in contact with the pressurized oil. Under certain conditions, the pressurized oil will chemically react with the metal, causing corrosion and damage to the components in the anti-collision structure, resulting in a decrease in the shock absorbing effect, thereby shortening the service life of the hydraulic cylinder. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in the prior art, the anti-collision structure is arranged in the cylinder barrel and contacts with the pressure oil, which may cause corrosion and damage to the parts and components, and easily shorten the service life of the hydraulic cylinder. Based on this, the utility model provides a long-life shock-absorbing hydraulic cylinder.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a long-life shock-absorbing hydraulic cylinder, comprising a cylinder barrel, a cylinder head, a guide sleeve, a piston, a piston rod and a shock-absorbing assembly, the cylinder head and the guide sleeve are respectively arranged at the two ends of the cylinder barrel, the piston is slidably arranged in the cylinder barrel, one end of the piston rod is fixedly connected with the piston after passing through the guide sleeve, the shock-absorbing assembly is arranged outside the cylinder barrel, the shock-absorbing assembly comprises a follower, a pressure plate, a fixed plate and an elastic member, the follower is fixedly connected to the piston rod, the pressure plate is fixedly connected to the follower, the fixed plate has two and is respectively fixedly arranged at the two ends of the cylinder barrel, the pressure plate is located between the two fixed plates, and an elastic member that can be extended and retracted along the moving direction of the pressure plate is arranged between each of the fixed plates and the pressure plate.

[0006] Furthermore, the follower comprises a follower plate fixedly sleeved on one end of the piston rod and a follower rod fixedly connected to the follower plate, and one end of the follower rod is fixedly connected to the pressure plate.

[0007] Furthermore, the pressing plate and the fixing plate are both annular structures and are coaxially arranged with the cylinder barrel. The pressing plate can be slidably sleeved on the outside of the cylinder barrel.

[0008] Furthermore, one end of the follower rod can slide through the pressure plate close to the guide sleeve and then be connected to the pressure plate. A threaded section is formed on the end of the follower rod connected to the pressure plate, and locking nuts are installed on both sides of the threaded section opposite to the pressure plate.

[0009] Furthermore, there are multiple follower rods, and the multiple follower rods are evenly arranged on the outer circumference of the cylinder.

[0010] Furthermore, among the two elastic members, one end of one of the elastic members is fixedly connected to one of the fixing plates, and one end of the other elastic member is fixedly connected to the other fixing plate.

[0011] Furthermore, a pressing sleeve is fixedly connected to one end of the elastic member close to the pressing plate. The pressing sleeve can be slidably sleeved on the outside of the cylinder, and the pressing sleeve can be abutted against the pressing plate.

[0012] Furthermore, a groove is provided on the surface of the pressing sleeve facing the pressing plate.

[0013] Furthermore, a fixed sleeve on the piston rod located on a side of the piston away from the cylinder head is provided with a limiting sleeve that can abut against the guide sleeve, and one end of the piston rod that passes through the piston forms a limiting portion that can abut against the cylinder head.

[0014] Furthermore, the two ends of the cylinder are respectively connected with a first oil pipe and a second oil pipe, and the first oil chamber and the second oil chamber are respectively formed on both sides of the piston in the cylinder, the first oil pipe is connected to the first oil chamber, and the second oil pipe is connected to the second oil chamber. When the limit sleeve abuts against the guide sleeve, the first oil pipe is located on the side of the piston away from the second oil pipe, and when the limit part abuts against the cylinder cover, the second oil pipe is located on the side of the piston away from the first oil pipe.

[0015] The beneficial effect of the utility model is that compared with the traditional hydraulic cylinder, the long-life shock-absorbing hydraulic cylinder of the utility model arranges the shock-absorbing component on the outside of the cylinder barrel, which is convenient for processing and manufacturing, and also avoids contact with the pressure oil in the cylinder body, thereby preventing the shock-absorbing component from being corroded and damaged due to long-term contact with the hydraulic oil, thereby improving the working reliability of the shock-absorbing component and extending the service life of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a three-dimensional diagram of the long-life shock-absorbing hydraulic cylinder of the utility model;

[0018] Figure 2 yes Figure 1 A three-dimensional diagram of another angle of view of the long-life shock-absorbing hydraulic cylinder shown;

[0019] Figure 3 yes Figure 1 The front view of the long-life shock-absorbing hydraulic cylinder shown;

[0020] Figure 4 yes Figure 3 A cross-sectional view along AA of a long-life shock-absorbing hydraulic cylinder is shown.

[0021] In the figure: 1, cylinder barrel, 11, first oil pipe, 12, second oil pipe, 13, first oil chamber, 14, second oil chamber, 2, cylinder head, 3, guide sleeve, 4, piston, 5, piston rod, 51, limiting sleeve, 52, limiting part, 6, shock absorbing assembly, 61, follower, 611, follower plate, 612, follower rod, 613, locking nut, 62, pressure plate, 63, fixing plate, 64, elastic member, 65, pressing sleeve, 651, groove. DETAILED DESCRIPTION

[0022] Now the utility model is described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the utility model in a schematic manner, so it only shows the components related to the utility model.

[0023] See also Figure 1-Figure 4The utility model provides a long-life shock-absorbing hydraulic oil cylinder, including a cylinder barrel 1, a cylinder head 2, a guide sleeve 3, a piston 4, a piston rod 5 and a shock-absorbing assembly 6. The cylinder head 2 is fixedly mounted on one end of the cylinder barrel 1, the guide sleeve 3 is detachably fixedly mounted on the other end of the cylinder barrel 1, the piston 4 is slidably arranged in the cylinder barrel 1, one end of the piston rod 5 is slidably passed through the guide sleeve 3 and is fixedly connected with the piston 4, and the shock-absorbing assembly 6 is arranged outside the cylinder barrel 1 to shock the piston rod 5 moved to the extreme position. The shock-absorbing assembly 6 is arranged outside the cylinder barrel 1 to avoid contact with the pressure oil in the cylinder body 1, thereby preventing the shock-absorbing assembly 6 from being corroded and damaged due to long-term contact with the hydraulic oil. In this embodiment, the guide sleeve 3 and the cylinder barrel 1 are fixedly connected by bolts, and the cylinder head 2 and the cylinder barrel 1 are fixed by welding.

[0024] The first oil pipe 11 and the second oil pipe 12 are connected to the two ends of the outer wall of the cylinder 1, and the first oil chamber 13 and the second oil chamber 14 are formed on both sides of the piston 4 in the cylinder 1, wherein the first oil pipe 11 is connected to the first oil chamber 13, and the second oil pipe 12 is connected to the second oil chamber 14. During operation, the pressure oil enters and exits the cylinder 1 through the first oil pipe 11 and the second oil pipe 12, thereby pushing the piston 4 to reciprocate in the cylinder 1.

[0025] A stop sleeve 51 is provided on the piston rod 5, which is located on the side of the piston 4 away from the cylinder head 2. The end of the piston rod 5 away from the guide sleeve 3 passes through the piston 4, and a stop portion 52 is formed on the end. When the piston 4 moves toward the guide sleeve 3 under the action of the pressure oil until the stop sleeve 51 abuts against the guide sleeve 3, the piston 4 cannot move further; when the piston 4 moves toward the cylinder head 2 under the action of the pressure oil until the stop portion 52 abuts against the cylinder head 2, the piston 4 cannot move further. Therefore, the setting of the stop sleeve 51 and the stop portion 52 can limit the extreme position of the piston 4 to control the maximum stroke of the piston rod 5. It should be noted that when the stop sleeve 51 abuts against the guide sleeve 3, the first oil pipe 11 is located on the side of the piston 4 away from the second oil pipe 12, and when the stop portion 52 abuts against the cylinder head 2, the second oil pipe 12 is located on the side of the piston 4 away from the first oil pipe 11, thereby ensuring that the pressure oil can enter the first oil chamber 13 and the second oil chamber 14 to push the piston 4 to move back and forth.

[0026] The shock absorbing assembly 6 includes a follower 61, a pressure plate 62, a fixed plate 63 and an elastic member 64. The follower 61 is fixedly connected to one end of the piston rod 5, the pressure plate 62 is fixedly connected to the follower 61, the fixed plate 63 has two and is respectively fixedly connected to the opposite ends of the outer wall of the cylinder 1, the pressure plate 62 is located between the two fixed plates 63, and an elastic member 64 that can be extended and retracted along the moving direction of the pressure plate 62 is arranged between each fixed plate 63 and the pressure plate 62.

[0027] When the hydraulic oil cylinder of the utility model is working, the follower 61 can drive the pressure plate 61 to move back and forth along the axial direction of the cylinder 1 under the telescopic action of the piston rod 5. Before the limit sleeve 51 moves to abut against the guide sleeve 3, the elastic member 64 between the pressure plate 62 and the fixed plate 63 close to the guide sleeve 3 is squeezed, so that the deformed elastic member 64 can relieve part of the force when the limit sleeve 51 collides with the guide sleeve 3, thereby achieving a shock absorbing effect. Similarly, before the limit portion 52 moves to abut against the cylinder head 2, the elastic member 64 between the pressure plate 62 and the fixed plate 63 close to the cylinder head 2 is compressed, so that the deformed elastic member 64 can relieve part of the force when the limit portion 52 collides with the cylinder head 2, thereby achieving a shock absorbing effect.

[0028] The pressure plate 62 and the fixed plate 63 are both annular structures and are coaxially arranged with the cylinder 1. The pressure plate 62 is slidably sleeved on the outside of the cylinder 1. The follower 61 includes a follower plate 611 fixedly sleeved on one end of the piston rod 5 and a follower rod 612 fixedly connected to the follower plate 611, and one end of the follower rod 612 is fixedly connected to the pressure plate 62.

[0029] As a preferred embodiment, one end of the follower rod 612 can slide through the pressure plate 62 close to the side of the guide sleeve 3 and then be connected to the pressure plate 62. A threaded section is formed on the end of the follower rod 612 for connecting with the pressure plate 62. Locking nuts 613 are installed on the threaded section on both sides of the pressure plate 62. During installation, after the threaded section of the follower rod 612 passes through the pressure plate 62, the locking nuts 613 can be tightened to squeeze the locking bolts 613 on both sides onto the opposite sides of the pressure plate 62, thereby realizing a fixed connection relationship between the follower rod 612 and the pressure plate 62.

[0030] Furthermore, there are multiple follower rods 612, and the multiple follower rods 612 are evenly arranged on the outer periphery of the cylinder 1 to achieve balanced force and make the pressure plate 62 slide stably. In this embodiment, there are four follower rods 612.

[0031] In this embodiment, one end of one of the two elastic members 64 is fixedly connected to one of the fixing plates 63, and one end of the other elastic member 64 is fixedly connected to the other fixing plate 63. In this way, when the piston rod 5 is about to move to the limit positions at both ends of the cylinder body 1, the pressing plate 62 can squeeze the elastic member 64 on the corresponding side. It can be understood that in other embodiments, the two elastic members 64 can also be fixedly connected to the opposite sides of the pressing plate 62, and when the piston rod 5 is about to move to the limit positions at both ends of the cylinder body 1, the pressing plate 62 can drive the elastic member 64 to squeeze on the fixing plate 63 on the corresponding side, which can also play a buffering and shock absorbing role.

[0032] In this embodiment, the elastic member 64 is a spring sleeved on the outside of the cylinder 1. In other embodiments, the elastic member 64 can also be a rigid and elastic element such as a stainless steel spring or a copper spring, which is not limited here.

[0033] As a preferred embodiment, a pressing sleeve 65 is fixedly connected to one end of the elastic member 64 near the pressing plate 62, and the pressing sleeve 65 is slidably sleeved on the outside of the cylinder 1, wherein the pressing sleeve 65 located between the pressing plate 62 and the fixed plate 63 near the side of the guide sleeve 3 is also slidably connected to the follower rod 612. During operation, the pressing plate 62 moves under the drive of the follower rod 612 to push against the pressing sleeve 65, thereby compressing the elastic member 64. By providing the pressing sleeve 65, the wear of the end of the elastic member 64 and the pressing plate 62 when they are in contact with each other can be reduced, and while avoiding serious wear of parts, the working stability of the elastic member 64 is also ensured.

[0034] Furthermore, a groove 651 is provided on the surface of the pressing sleeve 65 facing the pressing plate 62, and the groove 651 is arranged corresponding to the locking nut 613. During operation, when the pressing sleeve 65 is in contact with one side surface of the pressing plate 62, the locking nut 613 can be received in the groove 651, so as not to affect the close contact between the pressing sleeve 65 and the pressing plate 62.

[0035] Compared with the traditional hydraulic cylinder, the long-life shock-absorbing hydraulic cylinder of the utility model arranges the shock-absorbing component 6 on the outside of the cylinder barrel 1, which is convenient for processing and manufacturing, and also avoids contact with the pressure oil in the cylinder body 1, thereby preventing the shock-absorbing component 6 from being corroded and damaged due to long-term contact with the hydraulic oil, thereby improving the working reliability of the shock-absorbing component 6 and extending the service life of the hydraulic cylinder.

[0036] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the scope of the utility model through the above description. The technical scope of this utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A long-life shock-absorbing hydraulic cylinder, comprising a cylinder barrel, a cylinder cover, a guide sleeve, a piston, a piston rod and a shock-absorbing assembly, wherein the cylinder cover and the guide sleeve are respectively arranged at both ends of the cylinder barrel, the piston is slidably arranged in the cylinder barrel, one end of the piston rod passes through the guide sleeve and is fixedly connected to the piston, characterized in that: The shock absorbing assembly is arranged on the outside of the cylinder, and the shock absorbing assembly includes a follower, a pressure plate, a fixed plate and an elastic member. The follower is fixedly connected to the piston rod, and the pressure plate is fixedly connected to the follower. The fixed plates have two plates and are respectively fixed at the two ends of the cylinder. The pressure plate is located between the two fixed plates, and an elastic member that can be extended and retracted along the moving direction of the pressure plate is arranged between each of the fixed plates and the pressure plate.

2. The long-life shock-absorbing hydraulic cylinder according to claim 1, characterized in that: The follower comprises a follower plate fixedly sleeved on one end of the piston rod and a follower rod fixedly connected to the follower plate, and one end of the follower rod is fixedly connected to the pressure plate.

3. The long-life shock-absorbing hydraulic cylinder according to claim 2, characterized in that: The pressing plate and the fixing plate are both annular structures and are coaxially arranged with the cylinder barrel. The pressing plate can be slidably sleeved on the outside of the cylinder barrel.

4. The long-life shock-absorbing hydraulic cylinder according to claim 3, characterized in that: One end of the follower rod can slide through the pressure plate close to the guide sleeve and then be connected to the pressure plate. A threaded section is formed on the end of the follower rod connected to the pressure plate. Locking nuts are installed on both sides of the threaded section opposite to the pressure plate.

5. The long-life shock-absorbing hydraulic cylinder according to claim 2, characterized in that: There are a plurality of follower rods, and the plurality of follower rods are evenly arranged on the outer circumference of the cylinder.

6. The long-life shock-absorbing hydraulic cylinder according to claim 1, characterized in that: Among the two elastic members, one end of one of the elastic members is fixedly connected to one of the fixing plates, and one end of the other elastic member is fixedly connected to the other fixing plate.

7. The long-life shock-absorbing hydraulic cylinder according to claim 6, characterized in that: A pressing sleeve is fixedly connected to one end of the elastic member close to the pressing plate. The pressing sleeve can be slidably sleeved on the outside of the cylinder and can abut against the pressing plate.

8. The long-life shock-absorbing hydraulic cylinder according to claim 7, characterized in that: A groove is formed on the surface of the pressing sleeve facing the pressing plate.

9. The long-life shock-absorbing hydraulic cylinder according to claim 1, characterized in that: A fixed sleeve on the piston rod located on a side of the piston away from the cylinder cover is provided with a limiting sleeve that can abut against the guide sleeve, and one end of the piston rod that passes through the piston forms a limiting portion that can abut against the cylinder cover.

10. The long-life shock-absorbing hydraulic cylinder according to claim 9, characterized in that: The two ends of the cylinder are respectively connected with a first oil pipe and a second oil pipe, and a first oil chamber and a second oil chamber are respectively formed on both sides of the piston in the cylinder, the first oil pipe is connected to the first oil chamber, and the second oil pipe is connected to the second oil chamber. When the limiting sleeve abuts against the guide sleeve, the first oil pipe is located on the side of the piston away from the second oil pipe, and when the limiting part abuts against the cylinder cover, the second oil pipe is located on the side of the piston away from the first oil pipe.

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