CN114151408B - Single-rod self-locking double-acting hydraulic actuator - Google Patents
Single-rod self-locking double-acting hydraulic actuator Download PDFInfo
- Publication number
- CN114151408B CN114151408B CN202111461368.4A CN202111461368A CN114151408B CN 114151408 B CN114151408 B CN 114151408B CN 202111461368 A CN202111461368 A CN 202111461368A CN 114151408 B CN114151408 B CN 114151408B
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- Prior art keywords
- self
- piston rod
- side wall
- locking
- outer side
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- 238000007789 sealing Methods 0.000 claims abstract description 38
- 230000000149 penetrating effect Effects 0.000 claims abstract description 11
- 239000003921 oil Substances 0.000 claims description 51
- 239000010720 hydraulic oil Substances 0.000 claims description 13
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1433—End caps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1438—Cylinder to end cap assemblies
- F15B15/1442—End cap sealings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention relates to a single-rod self-locking double-acting hydraulic actuator, wherein a cylinder inner cavity is formed in the cylinder; the outer side wall of the cylinder body is provided with an extended oil filling hole in a penetrating way, and an oil outlet port extending out of the oil filling hole is communicated with the inner cavity of the cylinder body; the rear port of the cylinder body is connected with a bottom end cover through threads; the outer side wall of the bottom end cover is provided with a retraction oil filling hole in a penetrating way; an inner sealing ring of the end cover is embedded and arranged at intervals on the inner side wall of the front end of the bottom end cover; an end cover outer sealing ring is embedded and installed on the outer side wall of the front end of the bottom end cover; the rear port of the bottom end cover is connected with a sealing plug through threads; the outer side wall of the rear end of the sealing plug is embedded and provided with a plug sealing ring; the invention can provide the single-rod self-locking double-acting hydraulic actuator which has small volume, occupies small installation space, is firmly locked by the double-acting trapezoid self-locking thread structure, can be supported for a long time and is not easy to retract.
Description
Technical Field
The invention belongs to the technical field related to mechanical equipment, and particularly relates to a single-rod self-locking double-acting hydraulic actuator.
Background
The single-rod self-locking double-acting hydraulic actuator is mainly used for application working conditions requiring long-time positioning or hydraulic support, most of common structures in the industry at present adopt a hydraulic lock valve structure, a double-rod self-locking structure and a single-acting self-locking structure, the hydraulic lock valve structure cannot guarantee long-time pressure maintaining and position keeping due to the problems of self leakage and sealing leakage of the hydraulic actuator, the double-rod self-locking structure occupies large field space due to huge product volume, space waste and increase of manufacturing cost are caused for installation, and the single-acting self-locking structure is mechanical self-locking realized by adding mechanical threads and nuts outside a piston rod, but the structure only can realize unidirectional oil pressure and sacrifice the oil return function of the actuator, so that great difficulty is brought to field use and adjustment due to movement.
Disclosure of Invention
The invention aims to provide a single-rod self-locking double-acting hydraulic actuator which is small in size, occupies small installation space, is firmly locked by a double-acting trapezoid self-locking thread structure, and can be supported for a long time and is not easy to retract.
In order to achieve the above purpose, the present invention provides the following technical solutions: a single-rod self-locking double-acting hydraulic actuator comprises a cylinder body, wherein a cylinder body inner cavity is formed in the cylinder body; the outer side wall of the cylinder body is provided with an extended oil filling hole in a penetrating way, and an oil outlet port extending out of the oil filling hole is communicated with the inner cavity of the cylinder body; the rear port of the cylinder body is connected with a bottom end cover through threads; the outer side wall of the bottom end cover is provided with a retraction oil filling hole in a penetrating way; an end cover inner sealing ring is embedded and arranged at intervals on the inner side wall of the front end of the bottom end cover; an end cover outer sealing ring is embedded and installed on the outer side wall of the front end of the bottom end cover; the rear port of the bottom end cover is connected with a sealing plug through threads; the outer side wall of the rear end of the sealing plug is embedded and provided with a plug sealing ring; the side wall of the sealing plug is provided with an oil guide hole in a penetrating way, and an oil inlet port of the oil guide hole is in butt joint with an oil outlet port of the retraction oil injection hole; a locking nut is arranged on the inner side wall of the sealing plug; the lock nut is connected with a built-in piston rod through threads; the inner part of the built-in piston rod is provided with a built-in piston rod cavity; the outer side wall of the front end of the built-in piston rod is symmetrically and penetratingly provided with oil return holes; the front end of the built-in piston rod is connected with a squeezing ring; the outer side wall of the extrusion ring is sleeved with an extrusion ring sealing ring at intervals; the inner cavity of the cylinder body is internally provided with a self-locking piston rod in a fitting way, and the self-locking piston rod is sleeved on the outer side wall of the built-in piston rod; a self-locking piston rod cavity is formed in the self-locking piston rod; the outer side wall of the rear end of the self-locking piston rod is embedded and provided with a self-locking piston rod outer guide ring and a self-locking piston rod inner guide ring at intervals; the inner side wall of the rear end of the self-locking piston rod is provided with a self-locking piston rod inner guide ring and a self-locking piston rod inner sealing ring in an embedding way.
As a further improvement of the invention, the front port of the cylinder body is connected with a positioning guide sleeve through threads.
As a further improvement of the invention, the outer side wall of the self-locking piston rod is provided with a trapezoidal thread; the self-locking piston rod is connected with a trapezoid self-locking nut through a trapezoid thread.
As a further improvement of the invention, the front port of the self-locking piston rod is connected with a connector through threads.
As a further improvement of the invention, the extending oil filling hole and the retracting oil filling hole are connected with an external hydraulic oil filling cylinder through pipelines.
Compared with the prior art, the invention has the beneficial effects that: according to the technical scheme, the telescopic self-locking piston rod and the fixed built-in piston rod are sheathed in the cylinder body in a layered manner, so that the whole volume of the equipment is effectively reduced, and the installation space is occupied; according to the technical scheme, the self-locking piston rod is extended and retracted by injecting hydraulic oil into the extended oil filling hole and the retracted oil filling hole, so that the structure is simple and clear, and an operator can operate the self-locking piston rod more conveniently and rapidly; the self-locking piston rod is provided with the trapezoidal threads and the trapezoidal self-locking nuts, when the self-locking piston rod stretches out, the trapezoidal self-locking nuts are attached to the positioning guide ring to be locked, even if hydraulic oil in the cylinder body leaks, the self-locking piston rod cannot retract, the self-locking piston rod can work continuously, and therefore potential safety hazards caused by automatic retraction of the self-locking piston rod are reduced while the compression resistance of the device is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention.
In the figure: 1. a cylinder; 2. an inner cavity of the cylinder body; 3. extending out of the oil filling hole; 4. a bottom end cap; 5. retracting the oil filling hole; 6. an end cover inner sealing ring; 7. an end cover outer seal ring; 8. sealing the plugs; 9. a plug sealing ring; 10. an oil guide hole; 11. a lock nut; 12. a piston rod is arranged in the piston rod; 13. a piston rod cavity is arranged in the piston rod; 14. an oil return hole; 15. a pressing ring; 16. extruding a ring seal ring; 17. a self-locking piston rod; 18. a self-locking piston rod cavity; 19. an outer guide ring of the self-locking piston rod; 20. an outer sealing ring of the self-locking piston rod; 21. a self-locking piston rod inner guide ring; 22. self-locking piston rod inner sealing ring; 23. positioning a guide sleeve; 24. trapezoidal threads; 25. a trapezoid self-locking nut; 26. and (5) a connector.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides a technical solution: a single-rod self-locking double-acting hydraulic actuator comprises a cylinder body 1, wherein a cylinder body inner cavity 2 is formed in the cylinder body 1; the outer side wall of the cylinder body 1 is provided with an extended oil filling hole 3 in a penetrating way, and an oil outlet port extending out of the oil filling hole 3 is communicated with the inner cavity 2 of the cylinder body; by injecting hydraulic oil into the extending oil filling hole, the extending of the equipment can be realized, and an object is supported; the rear port of the cylinder body 1 is provided with a bottom end cover 4 through threaded connection; the outer side wall of the bottom end cover 4 is provided with a retraction oil filling hole 5 in a penetrating way; the retraction of the equipment can be realized by injecting hydraulic oil into the retraction oil filling hole; an end cover inner sealing ring 6 is embedded and arranged at the inner side wall of the front end of the bottom end cover 4 at intervals; an end cover outer sealing ring 7 is embedded and installed on the outer side wall of the front end of the bottom end cover 4; the rear port of the bottom end cover 4 is connected with a sealing plug 8 through threads; the outer side wall of the rear end of the sealing plug 8 is embedded and provided with a plug sealing ring 9; the side wall of the sealing plug 8 is provided with an oil guide hole 10 in a penetrating way, and an oil inlet port of the oil guide hole 10 is in butt joint with an oil outlet port of the retraction oil injection hole 5; the inner side wall of the sealing plug 8 is provided with a locking nut 11; the lock nut 11 is connected with a built-in piston rod 12 through threads; the built-in piston rod adopts a fixed mounting mode; the interior of the built-in piston rod 12 is provided with a built-in piston rod cavity 13; the outer side wall of the front end of the built-in piston rod 12 is symmetrically and penetratingly provided with oil return holes 14; the front end of the built-in piston rod 12 is connected and provided with a squeezing ring 15; the outer side wall of the extrusion ring 15 is sleeved and connected with an extrusion ring sealing ring 16 at intervals; a self-locking piston rod 17 is mounted in the cylinder body inner cavity 2 in an adhering way, and the self-locking piston rod 17 is sleeved on the outer side wall of the built-in piston rod 12; the self-locking piston rod adopts a sliding sleeve mounting mode; the self-locking piston rod 17 is internally provided with a self-locking piston rod cavity 18; the outer side wall of the rear end of the self-locking piston rod 17 is provided with a self-locking piston rod outer guide ring 19 and a self-locking piston rod inner guide ring 20 in a spaced embedded manner; the inner side wall of the rear end of the self-locking piston rod 17 is provided with a self-locking piston rod inner guide ring 21 and a self-locking piston rod inner sealing ring 22 in an embedded manner at intervals; the front port of the cylinder body 1 is connected with a positioning guide sleeve 23 through threads; the outer side wall of the self-locking piston rod 17 is provided with a trapezoidal thread 24; the self-locking piston rod 17 is connected with a trapezoid self-locking nut 25 through a trapezoid thread 24; the front end port of the self-locking piston rod 17 is connected with a connector 26 through threads; the extending oil filling hole 3 and the retracting oil filling hole 5 are connected with an external hydraulic oil filling cylinder through pipelines.
When an object needs to be supported, hydraulic oil is injected into the inner cavity 2 of the cylinder body through the extending oil hole 3, at the moment, the self-locking piston rod 17 extends forwards under the pushing of the hydraulic oil and drives the trapezoid self-locking nut 25 to extend together, so that the connector 26 supports the object, and when the object is supported, in order to avoid leakage or backflow of the hydraulic oil and influence the supporting effect of the connector, the knob of the trapezoid self-locking nut 25 can be attached to the positioning guide sleeve 23; when the self-locking piston rod 17 needs to return after supporting, the trapezoid self-locking nut 25 is adjusted to the uppermost end of the self-locking piston rod 17, hydraulic oil is injected into the retraction oil filling hole 5, and the hydraulic oil sequentially enters the self-locking piston rod cavity 18 through the retraction oil filling hole 5, the oil guide hole 10, the built-in piston rod cavity 13 and the oil return hole 14, so that the hydraulic oil extrudes the self-locking piston rod 17 to retract.
The foregoing is merely a preferred example of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A single-rod self-locking double-acting hydraulic actuator is characterized in that: the device comprises a cylinder body (1), wherein a cylinder body inner cavity (2) is formed in the cylinder body (1); the outer side wall of the cylinder body (1) is provided with an extended oil filling hole (3) in a penetrating way, and an oil outlet port extending out of the oil filling hole (3) is communicated with the inner cavity (2) of the cylinder body; the rear port of the cylinder body (1) is connected with a bottom end cover (4) through threads; the outer side wall of the bottom end cover (4) is provided with a retraction oil filling hole (5) in a penetrating way; an end cover inner sealing ring (6) is embedded and arranged at intervals on the inner side wall of the front end of the bottom end cover (4); an end cover outer sealing ring (7) is embedded and installed on the outer side wall of the front end of the bottom end cover (4); the rear port of the bottom end cover (4) is connected with a sealing plug (8) through threads; the outer side wall of the rear end of the sealing plug (8) is embedded and provided with a plug sealing ring (9); the side wall of the sealing plug (8) is provided with an oil guide hole (10) in a penetrating way, and an oil inlet port of the oil guide hole (10) is in butt joint with an oil outlet port of the retraction oil injection hole (5); the inner side wall of the sealing plug (8) is provided with a locking nut (11); the locking nut (11) is connected with a built-in piston rod (12) through threads; a built-in piston rod cavity (13) is formed in the built-in piston rod (12); the outer side wall of the front end of the built-in piston rod (12) is symmetrically and penetratingly provided with oil return holes (14); the front end of the built-in piston rod (12) is connected with a squeezing ring (15); an extrusion ring sealing ring (16) is sleeved on the outer side wall of the extrusion ring (15) at intervals; a self-locking piston rod (17) is mounted in the inner cavity (2) of the cylinder body in a fitting way, and the self-locking piston rod (17) is sleeved on the outer side wall of the built-in piston rod (12); a self-locking piston rod cavity (18) is formed in the self-locking piston rod (17); the outer side wall of the rear end of the self-locking piston rod (17) is embedded and provided with a self-locking piston rod outer guide ring (19) and a self-locking piston rod inner guide ring (20) at intervals; the inner side wall of the rear end of the self-locking piston rod (17) is provided with a self-locking piston rod inner guide ring (21) and a self-locking piston rod inner sealing ring (22) in an embedding manner.
2. A single-rod self-locking double-acting hydraulic actuator according to claim 1, characterized in that: the front end opening of the cylinder body (1) is connected with a positioning guide sleeve (23) through threads.
3. A single-rod self-locking double-acting hydraulic actuator according to claim 1, characterized in that: the outer side wall of the self-locking piston rod (17) is provided with a trapezoidal thread (24); the self-locking piston rod (17) is connected with a trapezoid self-locking nut (25) through a trapezoid thread (24).
4. A single-rod self-locking double-acting hydraulic actuator according to claim 1, characterized in that: the front end opening of the self-locking piston rod (17) is connected with a connector (26) through threads.
5. A single-rod self-locking double-acting hydraulic actuator according to claim 1, characterized in that: the extending oil filling hole (3) and the retracting oil filling hole (5) are connected with an external hydraulic oil filling cylinder through pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111461368.4A CN114151408B (en) | 2021-12-03 | 2021-12-03 | Single-rod self-locking double-acting hydraulic actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111461368.4A CN114151408B (en) | 2021-12-03 | 2021-12-03 | Single-rod self-locking double-acting hydraulic actuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114151408A CN114151408A (en) | 2022-03-08 |
| CN114151408B true CN114151408B (en) | 2024-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111461368.4A Active CN114151408B (en) | 2021-12-03 | 2021-12-03 | Single-rod self-locking double-acting hydraulic actuator |
Country Status (1)
| Country | Link |
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| CN (1) | CN114151408B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013381B (en) * | 2022-07-02 | 2024-05-28 | 安徽工程大学 | Multistage hydraulic cylinder guiding device with locking function |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101307788A (en) * | 2008-06-23 | 2008-11-19 | 上海耐斯特液压设备有限公司 | Ultra-high hydraulic double-acting mechanical locking oil cylinder |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202451500U (en) * | 2012-02-17 | 2012-09-26 | 山东众力液压技术有限公司 | Ultrahigh pressure mechanical self-locking hydraulic cylinder |
| CN103883581A (en) * | 2014-03-25 | 2014-06-25 | 庄筱凤 | Integrated self-locking intelligent informationized hydraulic cylinder device |
| CN204357821U (en) * | 2014-11-21 | 2015-05-27 | 安徽理工大学 | A kind of mechanical self-locking hydraulic cylinder |
| CN205331111U (en) * | 2015-12-18 | 2016-06-22 | 蓬莱巨涛海洋工程重工有限公司 | Servo superhigh pressure of two effects is from locking -type pneumatic cylinder |
| CN107035742A (en) * | 2017-06-21 | 2017-08-11 | 张多艳 | A kind of novel hydraulic cylinder |
| US11085465B2 (en) * | 2019-03-11 | 2021-08-10 | Goodrich Corporation | Retention systems for light weight actuator glands |
| CN210236969U (en) * | 2019-04-22 | 2020-04-03 | 武汉隆立洋液压工程有限公司 | Double-acting mechanical self-locking hydraulic jack |
| CN210889560U (en) * | 2019-08-16 | 2020-06-30 | 上海深拓液压技术有限公司 | Take self-locking function's landing leg hydro-cylinder |
| CN212455040U (en) * | 2020-06-05 | 2021-02-02 | 江苏军宏机械有限公司 | Large-diameter jack cylinder with external mechanical lock |
| CN212403321U (en) * | 2020-06-23 | 2021-01-26 | 杜恩武汉机械有限公司 | Double-acting self-locking hydraulic jack |
| CN111765144A (en) * | 2020-08-05 | 2020-10-13 | 马鞍山市裕华机械制造有限公司 | Self-locking type multi-cavity hydraulic oil cylinder and implementation method thereof |
| CN214247860U (en) * | 2021-01-08 | 2021-09-21 | 大连诺美液压件有限公司 | Hydraulic cylinder with self-locking function |
-
2021
- 2021-12-03 CN CN202111461368.4A patent/CN114151408B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101307788A (en) * | 2008-06-23 | 2008-11-19 | 上海耐斯特液压设备有限公司 | Ultra-high hydraulic double-acting mechanical locking oil cylinder |
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| Publication number | Publication date |
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| CN114151408A (en) | 2022-03-08 |
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