CN212959357U - Two-stage hydraulic cylinder - Google Patents
Two-stage hydraulic cylinder Download PDFInfo
- Publication number
- CN212959357U CN212959357U CN202021819373.9U CN202021819373U CN212959357U CN 212959357 U CN212959357 U CN 212959357U CN 202021819373 U CN202021819373 U CN 202021819373U CN 212959357 U CN212959357 U CN 212959357U
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- outer piston
- piston rod
- piston
- cylinder
- hydraulic cylinder
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Abstract
The utility model discloses a second grade pneumatic cylinder, including cylinder, setting at the first oilhole and the second oilhole at cylinder lateral wall both ends, slidable mounting at the outer piston of cylinder, setting at the outer piston rod of outer piston one end, slidable mounting at the inner piston of outer piston in the outer piston and set up including piston one end and slidable mounting at the inside inner piston rod of outer piston rod. The utility model has the advantages that the inner piston is arranged in the outer piston, so that the working stroke of the hydraulic cylinder is prolonged under the condition of a certain length of the cylinder barrel; under the condition of fully utilizing the length of the outer piston, the outer piston can be lengthened, so that the sealing performance of the outer piston is enhanced, and liquid leakage is prevented.
Description
Technical Field
The utility model relates to a second grade pneumatic cylinder belongs to machine-building technical field.
Background
The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and makes linear reciprocating motion. It has simple structure and reliable operation. When the reciprocating motion is realized by using the hydraulic cylinder, a speed reducer can be omitted, no transmission gap exists, and the reciprocating motion is stable, so that the hydraulic cylinder is widely applied to hydraulic systems of various machines.
In order to maintain the internal sealing performance of the existing hydraulic cylinder, the piston in the cylinder barrel needs to be lengthened to enhance the sealing performance, but when the piston is longer, the piston rod is shortened, the sealing performance is enhanced, and the working stroke of the hydraulic cylinder is reduced.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model provides a two-stage hydraulic cylinder, which is characterized in that an inner piston is arranged in an outer piston, and the working stroke of the hydraulic cylinder is prolonged under the condition of a certain length of a cylinder barrel; under the condition of fully utilizing the length of the outer piston, the outer piston can be lengthened, so that the sealing performance of the outer piston is enhanced, and liquid leakage is prevented.
In order to achieve the purpose, the two-stage hydraulic cylinder comprises a cylinder barrel, a first oil hole and a second oil hole which are arranged at two ends of the side wall of the cylinder barrel, an outer piston which is arranged in the cylinder barrel in a sliding mode, an outer piston rod which is arranged at one end of the outer piston, an inner piston which is arranged in the outer piston in a sliding mode, and an inner piston rod which is arranged at one end of the inner piston and is arranged in the outer piston rod in a sliding mode, a first guide sleeve is arranged on the inner wall of one end of the cylinder barrel close to the second oil hole, the outer piston is a hollow cylinder with two closed ends, both ends of the outer piston are provided with a plurality of through holes, the outer side wall is provided with a plurality of sealing rings, one end of the outer piston close to the second oil hole is provided with an outer piston rod communicated with the outer piston, the outer piston rod passes through the first guide sleeve and is connected with the first guide sleeve in a sliding way, the outer piston rod penetrates through the first guide sleeve, and the outer side wall of the inner piston is provided with a plurality of sealing rings.
Preferably, the side wall of the inner piston rod is provided with a plurality of sealing rings connected with the inner side wall of the outer piston rod in a sliding manner.
Preferably, a threaded hole is formed in one end, far away from the inner piston, of the inner piston rod, and a screw rod is installed in the threaded hole.
Preferably, a buffer device is further disposed on an inner wall of one end of the cylinder barrel close to the first oil hole.
Preferably, the through holes at the two ends of the outer piston are uniformly arranged.
Preferably, one end of the outer piston rod, which is far away from the outer piston, is provided with a second guide sleeve, and the second guide sleeve is connected with the outer wall of the inner piston rod in a sliding manner.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the inner piston is arranged in the outer piston, so that the working stroke of the hydraulic cylinder is prolonged under the condition that the length of the cylinder barrel is fixed;
2. under the condition of fully utilizing the length of the outer piston, the outer piston can be lengthened, so that the sealing performance of the outer piston is enhanced, and liquid leakage is prevented.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a cross-sectional view of the present invention;
fig. 3 is a schematic structural diagram of the outer piston and the outer piston rod of the present invention.
In the figure: 1. the hydraulic cylinder comprises a cylinder barrel, 1-1, a first guide sleeve, 2, a first oil hole, 3, a second oil hole, 4, an outer piston rod, 4-1, a second guide sleeve, 5, an inner piston rod, 6, a screw rod, 7, an outer piston, 8, an inner piston, 9 and a buffering device.
Detailed Description
The technical solutions in the implementation of the present invention will be clear from the following description and accompanying drawings, and the described embodiments are only some embodiments, not all embodiments, of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 to 3, a two-stage hydraulic cylinder provided in an embodiment of the present invention includes a cylinder barrel 1, a first oil hole 2 and a second oil hole 3 disposed at two ends of a side wall of the cylinder barrel 1, an outer piston 7 slidably mounted in the cylinder barrel 1, an outer piston rod 4 disposed at one end of the outer piston 7, an inner piston 8 slidably mounted in the outer piston 7, and an inner piston rod 5 disposed at one end of the inner piston 8 and slidably mounted inside the outer piston rod 4, wherein a first guide sleeve 1-1 is disposed on an inner wall of one end of the cylinder barrel 1 close to the second oil hole 3, the outer piston 7 is a hollow cylinder with two closed ends, a plurality of through holes are disposed at two ends of the outer piston 7, a plurality of seal rings are disposed on an outer side wall, an outer piston rod 4 communicated with the outer piston 7 is mounted at one end of the outer piston 7 close to the second oil hole 3, the outer piston rod 4 passes through the first guide sleeve 1-1 and is slidably connected, the outer piston rod 4 penetrates through the first guide sleeve 1-1, and a plurality of sealing rings are arranged on the outer side wall of the inner piston 8.
Preferably, the side wall of the inner piston rod 5 is provided with a plurality of sealing rings connected with the inner side wall of the outer piston rod 7 in a sliding manner. And (4) strengthening sealing.
Preferably, a threaded hole is formed in one end, far away from the inner piston 8, of the inner piston rod 5, and a screw rod 6 is installed in the threaded hole. The length can be increased, and the method is suitable for more use scenes.
Preferably, a buffer device 9 is further disposed on an inner wall of the cylinder tube 1 at an end close to the first oil hole 2. Protecting the outer piston 7.
Preferably, the through holes at both ends of the outer piston 7 are uniformly arranged. Is beneficial to the uniform stress.
Preferably, one end of the outer piston rod 4 far away from the outer piston 7 is provided with a second guide sleeve 4-1, and the second guide sleeve 4-1 is connected with the outer wall of the inner piston rod 5 in a sliding manner. Strengthening the seal and stabilizing the direction of movement.
The working process is as follows: hydraulic oil gets into cylinder 1 from first oilhole 2, in getting into outer piston 7 from cylinder 1, hydraulic oil promotes outer piston 7 and interior piston 8 and moves together, pushes out cylinder 1 with outer piston rod 4, pushes out outer piston rod 4 with interior piston rod 5. When hydraulic oil enters the cylinder barrel 1 from the second oil hole 3, the hydraulic oil enters the outer piston 7 from one end close to the second oil hole 3, the hydraulic oil pushes the outer piston 7 and the inner piston 8 to move towards the first oil hole 2, and the outer piston rod 4 and the inner piston rod 5 are contracted.
To sum up, the utility model prolongs the working stroke of the hydraulic cylinder under the condition that the length of the cylinder barrel 1 is fixed by arranging the inner piston 8 in the outer piston 7; when the length of the outer piston 7 can be fully utilized, the outer piston 7 can be lengthened, the sealing performance of the outer piston 7 is enhanced, and liquid leakage is prevented.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (6)
1. A two-stage hydraulic cylinder is characterized by comprising a cylinder barrel (1), a first oil hole (2) and a second oil hole (3) which are arranged at two ends of the side wall of the cylinder barrel (1), an outer piston (7) which is slidably arranged in the cylinder barrel (1), an outer piston rod (4) which is arranged at one end of the outer piston (7), an inner piston (8) which is slidably arranged in the outer piston (7), and an inner piston rod (5) which is arranged at one end of the inner piston (8) and is slidably arranged in the outer piston rod (4), wherein a first guide sleeve (1-1) is arranged on the inner wall of one end, close to the second oil hole (3), of the cylinder barrel (1), the outer piston (7) is a hollow cylinder body with two closed ends, a plurality of through holes are formed at two ends of the outer piston (7), a plurality of sealing rings are arranged on the outer side wall of the outer piston, an outer piston rod (4) which is communicated with the outer piston (7), the outer piston rod (4) penetrates through the first guide sleeve (1-1) and is connected with the first guide sleeve (1-1) in a sliding mode, the outer piston rod (4) penetrates through the first guide sleeve (1-1), and a plurality of sealing rings are arranged on the outer side wall of the inner piston (8).
2. A two-stage hydraulic cylinder according to claim 1, wherein the side wall of the inner piston rod (5) is provided with a plurality of sealing rings which are slidably connected with the inner side wall of the outer piston rod (4).
3. A two-stage hydraulic cylinder as claimed in claim 1, wherein the end of the inner piston rod (5) remote from the inner piston (8) is threaded and a threaded rod (6) is mounted in the threaded bore.
4. A two-stage hydraulic cylinder as claimed in claim 1, wherein a damping device (9) is further provided on the inner wall of the cylinder tube (1) at the end close to the first oil hole (2).
5. A two-stage hydraulic cylinder according to claim 1, characterised in that the through-holes at both ends of the outer piston (7) are evenly arranged.
6. A two-stage hydraulic cylinder according to claim 1, characterized in that the end of the outer piston rod (4) remote from the outer piston (7) is provided with a second guide sleeve (4-1), and the second guide sleeve (4-1) is in sliding contact with the outer wall of the inner piston rod (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021819373.9U CN212959357U (en) | 2020-08-26 | 2020-08-26 | Two-stage hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021819373.9U CN212959357U (en) | 2020-08-26 | 2020-08-26 | Two-stage hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212959357U true CN212959357U (en) | 2021-04-13 |
Family
ID=75362025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021819373.9U Expired - Fee Related CN212959357U (en) | 2020-08-26 | 2020-08-26 | Two-stage hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212959357U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116696886A (en) * | 2023-05-23 | 2023-09-05 | 昆山九龙液压机械有限公司 | Energy-saving efficient hydraulic cylinder for large die-casting mould |
-
2020
- 2020-08-26 CN CN202021819373.9U patent/CN212959357U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116696886A (en) * | 2023-05-23 | 2023-09-05 | 昆山九龙液压机械有限公司 | Energy-saving efficient hydraulic cylinder for large die-casting mould |
| CN116696886B (en) * | 2023-05-23 | 2024-05-24 | 昆山九龙液压机械有限公司 | Energy-saving efficient hydraulic cylinder for large die-casting mould |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210413 Termination date: 20210826 |