Oil cylinder with buffer structure
By designing the gap coordination between the buffer sleeve and the guide sleeve in the oil cylinder and the buffer sleeve with a two-layer step structure, the problem of impact and noise generated by the pressed oil cylinder during rapid movement is solved, and the two-stage buffering and long-term hydraulic oil squeezing impact capabilities are achieved, extending the service life of the oil cylinder.
Patent Information
- Application Number
- CN202422097797.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-28
AI Technical Summary
During rapid movement of the pressurized oil cylinder, it will produce strong impact, noise and mechanical collisions, especially under high pressure, which will affect the service life of the oil cylinder. The existing buffer structure is prone to deformity and has a short service life.
An oil cylinder with a buffer structure is designed, and the gap between the buffer sleeve and the guide sleeve is matched. The outer peripheral surface of the buffer sleeve is set into a two-layer step structure. The raised surface forms a gap of 0-0.2mm relative to the inner ring buffer surface of the guide sleeve, achieving two-stage buffering.
This design can withstand the squeeze impact of hydraulic oil for a long time during buffering, avoid deformation and damage of the oil cylinder, realize two-stage buffering, reduce jitter, and extend the service life of the oil cylinder.
Smart Images
Figure CN223019088U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil cylinders, in particular to an oil cylinder with a buffer structure. Background Art
[0002] During the rapid movement of the hydraulic cylinder, strong impacts, noises and even mechanical collisions will occur at the end of the stroke. Especially under high pressure, this influence is more obvious, seriously affecting the service life of the oil cylinder. Therefore, appropriate braking and buffering must be carried out before the end of the movement to ensure the service life of the system and the oil cylinder.
[0003] In the prior art, there are generally two ways to buffer. One is to control the oil circuit by using a throttle valve, and the other is to compress the oil circuit at the end of the movement stroke by setting a buffer sleeve to achieve throttling buffering. In the second way, the existing structure is easy to deform, has a low service life, and the buffer sleeve and the guide sleeve need to be replaced relatively frequently. Summary of the Utility Model
[0004] The purpose of the utility model is to provide an oil cylinder with a buffer structure.
[0005] The technical solution adopted by the utility model to solve its technical problems is:
[0006] An oil cylinder with a buffer structure includes a cylinder block and a piston rod located inside the cylinder block. One end of the piston rod is fixedly sleeved with a piston head, and a buffer sleeve is arranged on one side of the piston head. The outer diameter of the buffer sleeve is smaller than that of the piston head;
[0007] One end of the cylinder block is embedded with a guide sleeve, and an inner ring buffer surface is arranged at the inner side end of the guide sleeve;
[0008] One side of the cylinder block is connected with an oil inlet passage communicating with the inner cavity of the cylinder block, and the other end of the cylinder block is communicated with an oil return passage. An oil passing port is arranged at the end side part of the inner ring buffer surface, and the oil passing port is communicated with the oil return passage;
[0009] When the buffer sleeve slides into the guide sleeve, the buffer sleeve and the inner ring buffer surface of the guide sleeve are in clearance fit;
[0010] A raised surface is formed in the middle of the outer peripheral surface of the buffer sleeve. The height of the raised surface relative to the outer peripheral surface is between 0.8 mm and 1.5 mm, and the clearance between the raised surface and the inner ring buffer surface of the guide sleeve is between 0 and 0.2 mm. The length of the inner ring buffer surface is
[0011] Furthermore, the overall length of the buffer sleeve is between 65 mm and 70 mm, and several groups of sealing lips are arranged on the inner ring wall of the buffer sleeve.
[0012] Furthermore, a retaining edge that is interference-fitted with the inner wall of the cylinder block is arranged on the outer ring wall of the buffer sleeve near the outer end.
[0013] Furthermore, an outer head is provided at the outer end of the buffer sleeve, and the outer head is sealingly connected to the end of the cylinder block.
[0014] Furthermore, a flared inclined surface is provided at the entrance of the inner ring buffer surface.
[0015] The beneficial effects of the present utility model are as follows: The outer peripheral surface of the buffer sleeve of the present utility model is set as a two-layer stepped structure, and the stepped structure is more stable. When buffering, it can withstand the extrusion impact of hydraulic oil for a long time. The raised surface is equivalent to a certain margin and will not cause large deformation and damage. Secondly, when throttling, the stepped structure is equivalent to forming two throttling channels to achieve two-stage buffering, which can avoid the problem of the oil cylinder shaking.
[0016] Hereinafter, the present utility model will be described in more detail with reference to the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the product of the present utility model.
[0018] Figure 2 It is a schematic diagram of the guide sleeve structure of the present utility model.
[0019] Figure 3 It is a schematic diagram of the buffer sleeve structure of the present utility model.
[0020] Figure 4 It is a schematic diagram of the structure when the buffer sleeve and the guide sleeve of the present utility model are matched. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] As Figure 2 、 Figure 3 and Figure 4 shown, an oil cylinder with a buffer structure includes a cylinder block 1 and a piston rod 2 located inside the cylinder block 1. One end of the piston rod 2 is fixedly sleeved with a piston head 21. A buffer sleeve 3 is arranged on one side of the piston head 21, and the outer diameter of the buffer sleeve 3 is smaller than that of the piston head 21;
[0022] One end of the cylinder block 1 is embedded with a guide sleeve 4, and an inner ring buffer surface 42 is arranged at the inner end of the guide sleeve 4;
[0023] Referring to Figure 2As shown, the overall length of the buffer sleeve 3 is between 65 mm and 70 mm, preferably 67 mm. This length cannot be too long, otherwise the two ends are prone to deformation and bulging, nor can it be too short, otherwise it will affect the installation strength and cause displacement. A number of groups of sealing lips 43 are provided on the inner ring wall of the buffer sleeve 3. A retaining edge 44 that is interference-fitted with the inner wall of the cylinder block 1 is provided on the outer ring wall of the buffer sleeve 3 near the outer end. An outer head 45 is provided at the outer end of the buffer sleeve 3, and the outer head 45 is sealingly connected to the end of the cylinder block 1. A flared inclined surface is provided at the entrance of the inner ring buffer surface 42, which plays a role in guiding and draining.
[0024] An oil inlet passage 5 is connected to one side of the cylinder block 1 and communicates with the inner cavity of the cylinder block 1. The other end of the cylinder block 1 communicates with an oil return passage 6. An oil passing port 41 is provided on the end side of the inner ring buffer surface 42, and the oil passing port 41 communicates with the oil return passage 6;
[0025] When the buffer sleeve 3 slides into the guide sleeve 4, the buffer sleeve 3 and the inner ring buffer surface 42 of the guide sleeve 4 are in clearance fit;
[0026] A raised surface 31 is formed by the middle part of the outer peripheral surface 32 of the buffer sleeve 3. The height of the raised surface 31 relative to the outer peripheral surface 32 is between 0.8 mm and 1.5 mm. The clearance between the raised surface 31 and the inner ring buffer surface 42 of the guide sleeve 4 is between 0 and 0.2 mm. The length of the inner ring buffer surface 42 is between 20 mm and 25 mm. In order to reduce the difficulty of manufacturing accuracy, the raised surface 31 and the inner ring buffer surface 42 of the guide sleeve 4 can be in clearance fit or directly in contact, as long as interference is avoided, and the secondary throttling buffer of the raised surface 31 can be realized.
[0027] During operation, first, hydraulic oil is input through the oil inlet passage 5 to push the piston head 21, driving the piston rod 2 to move. When it is about to reach the end of the stroke, the outer peripheral surface 32 of the buffer sleeve 3 and the inner ring buffer surface 42 compress the oil passage to become smaller, resulting in an independent increase in the stroke, a decrease in the speed of the piston rod 2, and a slow push. After the raised surface 31 enters the guide sleeve 4, the speed continues to decrease until it stops.
[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture shown in the drawings. If this specific posture changes, then the directional indicators will also change accordingly.
[0029] The present invention has been described exemplarily above in conjunction with the drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or directly applied to other occasions without improvement, they all fall within the protection scope of the present invention.
Claims
1. A cylinder with a buffer structure, characterized in that : comprising a cylinder body (1) and a piston rod (2) located inside the cylinder body (1), one end of the piston rod (2) being fixedly sleeved with a piston head (21), one side of the piston head (21) being provided with a buffer sleeve (3), and the outer diameter of the buffer sleeve (3) being smaller than that of the piston head (21); A guide sleeve (4) is embedded in one end of the cylinder body (1), and an inner ring buffer surface (42) is provided at the inner end of the guide sleeve (4); One side of the cylinder body (1) is connected to an oil inlet passage (5) which is in communication with the inner cavity of the cylinder body (1), and the other end of the cylinder body (1) is in communication with an oil return passage (6). An oil passage port (41) is provided at the end side of the inner ring buffer surface (42), and the oil passage port (41) is in communication with the oil return passage (6); When the buffer sleeve (3) slides into the guide sleeve (4), the buffer sleeve (3) and the inner ring buffer surface (42) of the guide sleeve (4) are in clearance fit; The middle part of the outer peripheral surface (32) of the buffer sleeve (3) is raised to form a raised surface (31), the height of the raised surface (31) relative to the outer peripheral surface (32) is between 0.8 mm and 1.5 mm, the gap between the raised surface (31) and the inner ring buffer surface (42) of the guide sleeve (4) is between 0 and 0.2 mm, and the length of the inner ring buffer surface (42) is between 20 mm and 25 mm.
2. The oil cylinder with a buffer structure according to claim 1, characterized in that: The overall length of the buffer sleeve (3) is between 65 mm and 70 mm, and the inner ring wall of the buffer sleeve (3) is provided with a plurality of groups of sealing lips (43).
3. The oil cylinder with a buffer structure according to claim 2, characterized in that: A portion of the outer ring wall of the buffer sleeve (3) close to the outer end is provided with a retaining edge (44) which interferes with the inner wall of the cylinder body (1).
4. The oil cylinder with a buffer structure according to claim 3, characterized in that: An outer end portion of the buffer sleeve (3) is provided with an outer sealing head (45), and the outer sealing head (45) is sealingly connected to the end portion of the cylinder body (1).
5. The oil cylinder with a buffer structure according to claim 1, characterized in that: The entrance of the inner ring buffer surface (42) is provided with a flaring inclined surface.