CN211737646U - Buffer oil cylinder - Google Patents
Buffer oil cylinder Download PDFInfo
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- CN211737646U CN211737646U CN202020174893.2U CN202020174893U CN211737646U CN 211737646 U CN211737646 U CN 211737646U CN 202020174893 U CN202020174893 U CN 202020174893U CN 211737646 U CN211737646 U CN 211737646U
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Abstract
The utility model relates to a buffer cylinder. The cylinder comprises a cylinder barrel, a front cylinder cover, a rear cylinder cover, a piston rod and a piston; the piston rods penetrate through the front lever cover and extend into the cylinder barrel to be distributed; the piston is sleeved at the rear end part of the piston rod; an oil inlet is formed in the rear cylinder cover; an oil return port is formed in the front cylinder cover, and buffer holes distributed around the piston rod are formed in the front cylinder cover; a buffer sleeve is formed at the front end part of the piston; when the piston is close to the front cylinder cover, the buffer sleeve insertion sleeve extends into the buffer hole to be distributed, and the gap between the buffer sleeve and the buffer hole is gradually reduced from the front end to the rear end. The utility model discloses utilize the special construction cooperation front cylinder cap of cushion collar and slowly punch a hole, when the piston was close to the front cylinder cap, force the flow of buffer intracavity hydraulic oil progressively to diminish to play buffering location and buffering absorbing effect well, eliminate the mechanical striking between piston rod and the front cylinder cap that causes because of moving part's inertial force and hydraulic pressure force, also can reduce the noise of piston rod liquid when changing the direction of motion simultaneously.
Description
Technical Field
The utility model belongs to the technical field of the hydro-cylinder technique and specifically relates to a buffer cylinder.
Background
The hydraulic cylinder comprises a cylinder barrel, a cylinder cover, a piston rod and a piston, wherein the piston rod penetrates through the cylinder cover and extends into one end inside the cylinder barrel, and the piston can be driven by the piston to reciprocate when the piston is pushed by hydraulic oil. In the process that the driving mass of the hydraulic oil cylinder is increased and the movement speed is high, strong impact, noise and even mechanical collision can be generated between the piston rod and the cylinder cover at the stroke end, and the service life of the hydraulic oil cylinder is seriously influenced.
The existing buffer oil cylinder is provided with a buffer structure in the oil cylinder, has small volume, does not need to additionally increase any hydraulic elements such as a flow control valve and the like, and is an ideal buffer mode; however, the existing buffer structure in the oil cylinder is generally complex in structure, so that the complexity of the whole hydraulic system is easily increased, and the cost of the whole system is increased; in addition, the complex inner buffer structure easily reduces the sealing property between the piston and the inner wall of the cylinder barrel, and influences the performance of the oil cylinder.
SUMMERY OF THE UTILITY MODEL
To the not enough of above-mentioned prior art existence, the utility model aims to provide a buffer cylinder.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a kind of cushion cylinder, it includes cylinder, front cylinder cover, back cylinder cover, piston rod and piston; the front cylinder cover and the rear cylinder cover respectively encapsulate the front end and the rear end of the cylinder barrel; the rear end of the piston rod penetrates through the front lever cover along the axis direction of the cylinder barrel and extends into the cylinder barrel to be distributed, and the front end of the piston rod extends out of the cylinder barrel; the piston is sleeved at the rear end part of the piston rod and divides the inner cavity of the cylinder barrel into a rod cavity and a rodless cavity;
the rear cylinder cover is provided with an oil inlet communicated with the rodless cavity; the front cylinder cover is provided with an oil return port, a buffer hole distributed around the piston rod is formed in the front cylinder cover, and the rod cavity is communicated with the oil return port through the buffer hole; the front end part of the piston extends forwards to form a buffer sleeve sleeved on the piston rod;
when the piston is close to the front cylinder cover, the buffer sleeve insertion sleeve extends into the buffer hole to be distributed, a buffer cavity is formed among the piston, the buffer sleeve, the cylinder barrel and the front cylinder cover, and a gap between the buffer sleeve and the buffer hole is gradually reduced from the front end to the rear end.
Preferably, the buffer hole is cylindrical, and the outer diameter of the buffer sleeve is gradually increased from front to back.
Preferably, the piston comprises a front piston head and a rear piston head, and the buffer sleeve is formed by extending the front end surface of the front piston head forwards;
the rear end of the piston rod is provided with a first stage and a second stage, the outer diameters of the first stage and the second stage are sequentially reduced, the front piston head and the buffer sleeve are sleeved on the first stage, the rear piston head is sleeved on the second stage in a threaded manner, and the front end of the rear piston head abuts against the rear end of the front piston head so that the buffer sleeve abuts against a shoulder at the front end of the first stage.
Preferably, the piston further comprises a combined oil seal, the combined oil seal is sleeved on the outer peripheral side of the joint of the front piston head and the rear piston head and clamped between the front piston head and the rear piston head, and the peripheral wall of the combined oil seal is distributed in a manner of clinging to the inner wall of the cylinder barrel.
Preferably, the combined oil seal comprises a front wear-resistant ring, a rear wear-resistant ring and a sealing ring clamped between the front wear-resistant ring and the rear wear-resistant ring; the front wear-resistant ring, the sealing ring and the rear wear-resistant ring are sequentially clamped between the front piston head and the rear piston head; the section of the sealing ring is in a T shape, the front wear-resisting ring is sleeved on the peripheries of the front end part of the front piston head and the sealing ring, and the rear wear-resisting ring is sleeved on the peripheries of the rear end part of the rear piston head and the sealing ring; the front end part of the rear piston head is respectively abutted against the rear wear-resistant ring, the sealing ring and the front piston head.
By adopting the scheme, the utility model utilizes the special structure of the buffer sleeve to match with the front cylinder cover and the buffer hole, when the piston is close to the front cylinder cover, the hydraulic oil in the buffer cavity must flow into the buffer hole and the oil return port through the clearance between the buffer sleeve and the buffer hole; and in the in-process that the cushion collar progressively stretches into the cushion collar, clearance between cushion collar and the cushion collar will diminish gradually, can force the flow of buffer intracavity hydraulic oil to diminish gradually, thereby make the piston rod progressively slow down that the velocity of motion of hydro-cylinder is promptly, finally stop, thereby play buffering location and buffering absorbing effect well, eliminate the mechanical impact between piston rod and the preceding cylinder cap that causes because of moving part's inertial force and hydraulic pressure force, the noise of liquid when also can reduce the piston rod change direction of motion simultaneously, have very strong practical value and market spreading value.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a partial cross-sectional structure of an embodiment of the present invention;
fig. 3 is a state diagram of the piston of the embodiment of the present invention near the front cylinder head;
FIG. 4 is a diagram illustrating a state in which the buffer sleeve of the embodiment of the present invention is inserted into the buffer hole;
fig. 5 is a schematic cross-sectional view of a piston rod according to an embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1 to 5, an embodiment of the present invention provides a cushion cylinder, which includes a cylinder barrel 1, a front cylinder cover 2, a rear cylinder cover 3, a piston rod 4 and a piston 5; the front cylinder cover 2 and the rear cylinder cover 3 respectively encapsulate the front end and the rear end of the cylinder barrel 1; the rear end of the piston rod 4 penetrates through the front lever cover along the axis direction of the cylinder barrel 1 and extends into the cylinder barrel 1 to be distributed, and the front end of the piston rod 4 extends out of the cylinder barrel 1; the piston 5 is sleeved at the rear end part of the piston rod 4 and divides the inner cavity of the cylinder barrel 1 into a rod cavity a and a rodless cavity b;
an oil inlet 31 communicated with the rodless cavity b is formed in the rear cylinder cover 3; an oil return port 21 is formed in the front cylinder cover 2, a buffer hole 22 distributed around the piston rod 4 is formed in the front cylinder cover 2, and the rod cavity a is communicated with the oil return port 21 through the buffer hole 22; a buffer sleeve 51 sleeved on the piston rod 4 is formed at the front end part of the piston 5 in a forward extending mode;
when the piston 5 is close to the front cylinder head 2, the buffer sleeve 51 is inserted into the buffer hole 22 and distributed, a buffer cavity c is formed among the piston 5, the buffer sleeve 51, the cylinder barrel 1 and the front cylinder head 2, hydraulic oil in the buffer cavity c flows into the buffer hole 22 and the oil return opening 21 through a gap between the buffer sleeve 51 and the buffer hole 22, and the gap between the buffer sleeve 51 and the buffer hole 22 is gradually reduced from the front end to the rear end (as shown in fig. 4).
Based on the above structural arrangement, hydraulic oil enters the rodless cavity b through the oil inlet 31 to push the piston rod 4 to move forward, and when the piston 5 approaches the front cylinder cover 2, the hydraulic oil in the buffer cavity c must flow into the buffer hole 22 and the oil return port 21 through a gap between the buffer sleeve 51 and the buffer hole 22; and in the in-process that the cushion collar 51 gradually stretches into the buffer hole 22, the clearance between cushion collar 51 and the buffer hole 22 will diminish gradually, can force the flow of hydraulic oil in the cushion chamber c to diminish gradually, thereby make the piston rod 4 the moving speed of hydro-cylinder slow down gradually, finally stop, thereby play buffering location and buffering absorbing effect well, eliminate the mechanical impact between piston rod 4 and the preceding cylinder cap 2 that causes because of the inertial force and the hydraulic pressure force of moving part, the noise of liquid when also can reduce piston rod 4 changes the direction of motion simultaneously.
As a preferred embodiment of the cushion cylinder provided in this embodiment, the cushion hole 22 is cylindrical, and the outer diameter of the cushion sleeve 51 gradually increases from front to back. That is, the cylindrical buffer hole 22 is matched with the cone-like buffer sleeve 51, so that the gap between the buffer sleeve 51 and the buffer hole 22 is gradually reduced from the front end to the rear end.
In order to improve the stability of the piston 5 on the piston rod 4, as a preferred embodiment of the cushion cylinder provided in this embodiment, please refer to fig. 2-5, in which the piston 5 includes a front piston head 52 and a rear piston head 53, and the cushion sleeve 51 is formed by extending the front end surface of the front piston head 52 forward; the rear end of the piston rod 4 is provided with a first stage 41 and a second stage 42 with sequentially reduced outer diameters, the front piston head 52 and the buffer sleeve 51 are sleeved on the first stage 41, the rear piston head 53 is sleeved on the second stage 42 in a threaded manner, and the front end of the rear piston head 53 abuts against the rear end of the front piston head 52 so that the buffer sleeve 51 abuts against the shoulder of the front end of the first stage 41. Therefore, when assembling the piston 5, the front piston head 52 can be sleeved on the first stage 41, the rear piston head 53 can be tightly sleeved on the second stage 42 in a threaded manner, and the front piston head 52 is tightly clamped between the front end shoulder of the first stage 41 and the rear piston head 53.
In order to improve the sealing performance between the piston 5 and the inner wall of the cylinder tube 1, as a preferred embodiment of the cushion cylinder provided in this embodiment, please refer to fig. 2 to 5, the piston 5 further includes a combined oil seal, the combined oil seal is sleeved on the outer peripheral side of the joint of the front piston head 52 and the rear piston head 53 and is clamped between the front piston head 52 and the rear piston head 53, and the outer peripheral wall of the combined oil seal is tightly distributed on the inner wall of the cylinder tube 1. In the process of assembling the front piston head 52 and the rear piston head 53, the combined oil seal can be directly clamped between the front piston head 52 and the rear piston head 53, and compared with a structure of directly sleeving an oil seal, the tightness of the outer peripheral side of the joint of the front piston head 52 and the rear piston head 53 of the combined oil seal is improved; meanwhile, the outer peripheral wall of the combined oil seal is tightly attached to the inner wall of the cylinder barrel 1, so that the sealing performance between the piston 5 and the inner wall of the cylinder barrel 1 is improved.
Further, as a preferred embodiment of the cushion cylinder provided in this embodiment, please refer to fig. 2 to 5, in which the above-mentioned combination oil seal includes a front wear-resisting ring 54, a rear wear-resisting ring 55, and a sealing ring 56 sandwiched between the front wear-resisting ring 54 and the rear wear-resisting ring 55; the front wear-resistant ring 54, the sealing ring 56 and the rear wear-resistant ring 55 are sequentially clamped between the front piston head 52 and the rear piston head 53; the section of the sealing ring 56 is T-shaped, the front wear-resistant ring 54 is sleeved on the peripheries of the front end parts of the front piston head 52 and the sealing ring 56, and the rear wear-resistant ring 55 is sleeved on the peripheries of the rear end parts of the rear piston head 53 and the sealing ring 56, so that the front end and the rear end of the sealing ring 56 are clamped; the front end of the rear piston head 53 abuts against the rear wear ring 55, the sealing ring 56 and the front piston head 52, so that the front wear ring 54, the sealing ring 56 and the rear wear ring 55 are clamped and fixed between the front piston head 52 and the rear piston head 53, and the structural stability of the piston 5 is improved.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (5)
1. The utility model provides a cushion cylinder which characterized in that: the cylinder comprises a cylinder barrel, a front cylinder cover, a rear cylinder cover, a piston rod and a piston; the front cylinder cover and the rear cylinder cover respectively encapsulate the front end and the rear end of the cylinder barrel; the rear end of the piston rod penetrates through the front lever cover along the axis direction of the cylinder barrel and extends into the cylinder barrel to be distributed, and the front end of the piston rod extends out of the cylinder barrel; the piston is sleeved at the rear end part of the piston rod and divides the inner cavity of the cylinder barrel into a rod cavity and a rodless cavity;
the rear cylinder cover is provided with an oil inlet communicated with the rodless cavity; the front cylinder cover is provided with an oil return port, a buffer hole distributed around the piston rod is formed in the front cylinder cover, and the rod cavity is communicated with the oil return port through the buffer hole; the front end part of the piston extends forwards to form a buffer sleeve sleeved on the piston rod;
when the piston is close to the front cylinder cover, the buffer sleeve insertion sleeve extends into the buffer hole to be distributed, a buffer cavity is formed among the piston, the buffer sleeve, the cylinder barrel and the front cylinder cover, and a gap between the buffer sleeve and the buffer hole is gradually reduced from the front end to the rear end.
2. The cushion cylinder of claim 1, wherein: the buffer hole is cylindrical, and the outer diameter of the buffer sleeve is gradually increased from front to back.
3. The cushion cylinder of claim 1, wherein: the piston comprises a front piston head and a rear piston head, and the buffer sleeve is formed by extending the front end surface of the front piston head forwards;
the rear end of the piston rod is provided with a first stage and a second stage, the outer diameters of the first stage and the second stage are sequentially reduced, the front piston head and the buffer sleeve are sleeved on the first stage, the rear piston head is sleeved on the second stage in a threaded manner, and the front end of the rear piston head abuts against the rear end of the front piston head so that the buffer sleeve abuts against a shoulder at the front end of the first stage.
4. A cushion cylinder as claimed in claim 3, wherein: the piston further comprises a combined oil seal, the combined oil seal is sleeved on the outer peripheral side of the joint of the front piston head and the rear piston head and clamped between the front piston head and the rear piston head, and the outer peripheral wall of the combined oil seal is distributed in a manner of clinging to the inner wall of the cylinder barrel.
5. The cushion cylinder of claim 4, wherein: the combined oil seal comprises a front wear-resistant ring, a rear wear-resistant ring and a sealing ring clamped between the front wear-resistant ring and the rear wear-resistant ring; the front wear-resistant ring, the sealing ring and the rear wear-resistant ring are sequentially clamped between the front piston head and the rear piston head; the section of the sealing ring is in a T shape, the front wear-resisting ring is sleeved on the peripheries of the front end part of the front piston head and the sealing ring, and the rear wear-resisting ring is sleeved on the peripheries of the rear end part of the rear piston head and the sealing ring; the front end part of the rear piston head is respectively abutted against the rear wear-resistant ring, the sealing ring and the front piston head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020174893.2U CN211737646U (en) | 2020-02-14 | 2020-02-14 | Buffer oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020174893.2U CN211737646U (en) | 2020-02-14 | 2020-02-14 | Buffer oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211737646U true CN211737646U (en) | 2020-10-23 |
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ID=72877894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020174893.2U Active CN211737646U (en) | 2020-02-14 | 2020-02-14 | Buffer oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211737646U (en) |
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2020
- 2020-02-14 CN CN202020174893.2U patent/CN211737646U/en active Active
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