CN113090608A - Hydraulic jacking oil cylinder - Google Patents
Hydraulic jacking oil cylinder Download PDFInfo
- Publication number
- CN113090608A CN113090608A CN202110331615.2A CN202110331615A CN113090608A CN 113090608 A CN113090608 A CN 113090608A CN 202110331615 A CN202110331615 A CN 202110331615A CN 113090608 A CN113090608 A CN 113090608A
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- cylinder
- oil
- piston
- piston rod
- ring
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- 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
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- 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
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- 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
- F15B15/1452—Piston sealings
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- 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
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention provides a hydraulic jacking oil cylinder, which comprises a cylinder barrel, a piston rod, a piston, an oil cylinder lug ring, an oil delivery pipe, an oil cylinder bottom and a guide sleeve, wherein the piston rod is in a cylindrical barrel shape, the top of the piston rod is fixedly connected with the oil cylinder lug ring, the bottom of the piston rod is fixedly connected with the piston, the piston comprises a piston core column, a sealing element mounting ring and an annular sealing element, the top of the piston core column and the bottom of the piston rod are fixedly connected with the oil cylinder bottom and are fixedly connected with the bottom of the cylinder barrel and seal the bottom of the cylinder barrel, the guide sleeve is fixedly arranged at the top of the cylinder barrel, the oil cylinder lug ring is provided with a first oil inlet and a second oil inlet on the side wall, a first oil inlet flow passage and a second oil inlet flow passage which correspond to the first oil inlet and the second oil inlet are arranged inside the oil cylinder lug ring, the first oil, and the oil inlet flow passage II is communicated with the inner cavity of the piston rod.
Description
Technical Field
The invention belongs to the technical field of hydraulic oil cylinders, and particularly relates to a hydraulic jacking oil cylinder.
Background
The hydraulic oil cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and makes linear reciprocating motion (or swinging motion). It has simple structure and reliable operation. When it is used to implement reciprocating motion, it can omit speed-reducing device, and has no transmission gap, and its motion is stable, so that it can be extensively used in various mechanical hydraulic systems. The output force of the hydraulic oil cylinder is in direct proportion to the effective area of the piston and the pressure difference between the two sides of the piston; the hydraulic oil cylinder basically comprises a cylinder barrel, a cylinder cover, a piston rod, a sealing device, a buffering device and an exhaust device. The damping device and the exhaust device are determined according to specific application occasions, and other devices are necessary.
As shown in fig. 1, in a conventional hydraulic jacking cylinder, a piston rod is arranged in a cylinder barrel, two ends of the cylinder barrel are respectively sealed by sealing parts, a piston is arranged on the piston rod and divides an inner cavity of the cylinder barrel into a first cavity and a second cavity, a first oil duct leading to the first cavity and a second oil duct leading to the second cavity are arranged on the cylinder barrel, and hydraulic oil is pumped into the first cavity and the second cavity through the first oil duct and the second oil duct respectively to control the movement stroke of the piston rod.
The hydraulic jacking oil cylinder has the following defects:
firstly, because the cylinder barrel wall is thin, a connecting device for connecting a first oil duct and an oil inlet pipeline and a second oil duct and an oil inlet pipeline needs to be arranged on a cylinder body, and the connecting device and the oil inlet pipeline are driven when the cylinder body moves, so that the connecting device is easy to damage;
and secondly, the initial deflection formed by self weight is large when the piston rod of the long-stroke hydraulic jacking oil cylinder is completely extended out, and the piston rod is easy to damage and bend.
Disclosure of Invention
The invention aims to solve the technical problems and provides a hydraulic jacking oil cylinder.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hydraulic jacking oil cylinder comprises a cylinder barrel, a piston rod, a piston, an oil cylinder lug ring, an oil conveying pipe, an oil cylinder bottom and a guide sleeve, wherein the piston rod is in a cylindrical shape, the top of the piston rod is fixedly connected with the oil cylinder lug ring, the bottom of the piston rod is fixedly connected with the piston, the piston comprises a piston core column, a sealing element mounting ring and an annular sealing element, the top of the piston core column is fixedly connected with the bottom of the piston rod, the sealing element mounting ring is sleeved outside the piston core column and fixedly connected with the piston core column, the outer diameter of the sealing element mounting ring is smaller than the inner diameter of the cylinder barrel, the sealing element mounting ring is provided with a circle of sealing element mounting groove in the periphery, the annular sealing element is fixedly mounted in the sealing ring mounting groove, the piston rod and the piston are arranged in the cylinder barrel, the oil cylinder bottom is fixedly connected with the bottom of, the guide sleeve is fixedly arranged at the top of the cylinder barrel and used for blocking a gap between the piston rod and the cylinder barrel, a first oil inlet and a second oil inlet are formed in the side wall of the oil cylinder earring, a first oil inlet flow channel and a second oil inlet flow channel which correspond to the first oil inlet and the second oil inlet are formed in the oil cylinder earring, the first oil inlet flow channel is connected with the oil conveying pipe, the oil conveying pipe penetrates through the piston rod and the piston core column and is communicated with the inner cavity of the cylinder barrel, the piston core column is provided with a communicating oil return flow channel, the inner cavity of the cylinder barrel is communicated with the inner cavity of the piston rod, and the second oil inlet.
Preferably, a plurality of sealing ring mounting grooves are axially formed in the inner wall of the guide sleeve, sealing rings are respectively mounted in the sealing ring mounting grooves, and the sealing rings sequentially comprise 5-type Angstrom seal, RU series sealing elements, wear-resistant rings and K-type Teconster seal along the direction from the top to the bottom of the piston rod.
Preferably, the annular sealing element comprises an elastic body and two side check rings, the cross section of the elastic body is in a convex shape, the cross section of each check ring is in an L shape, and each check ring is clamped at the step of the corresponding sealing ring mounting groove.
Preferably, the hydraulic jacking cylinder further comprises a dustproof sleeve, the dustproof sleeve is sleeved on the periphery of the piston rod, the top of the dustproof sleeve is installed on the earrings of the cylinder through hoops, the bottom of the dustproof sleeve is installed on the cylinder through hoops, and the dustproof sleeve is a zipper-type dustproof sleeve.
Preferably, the section of the oil cylinder lug ring is rectangular.
Preferably, the top end of the oil cylinder lug is provided with a bolt groove.
Preferably, a fixing screw mounting groove is formed in the piston, an axis of the fixing screw mounting groove is perpendicular to an axis of the piston, and a fixing screw for limiting relative rotation of the piston core column and the sealing element mounting ring is arranged in the fixing screw mounting groove.
Preferably, the bottom surface of the cylinder bottom of the oil cylinder is conical.
Preferably, a protection piece is fixedly arranged outside the cylinder barrel, the protection piece is in a circular truncated cone shape, and the top of the protection piece faces the bottom of the cylinder barrel.
After the technical scheme is adopted, the invention has the following advantages:
according to the hydraulic jacking oil cylinder, the first oil inlet and the second oil inlet are arranged on the oil cylinder earrings, and the oil cylinder earrings are relatively fixed, so that an oil inlet pipeline connected with the first oil inlet and the second oil inlet cannot be driven by the movement of the cylinder body, and a connecting device used for connecting the oil inlet pipeline at the first oil inlet and the second oil inlet is not easy to damage; the cavity inside the piston rod is communicated with the cavity outside the piston rod through the oil return flow passage, so that the pressures inside and outside the piston rod inside the cylinder barrel are equal in the jacking process of the cylinder, the radial unbalance loading force on the piston rod is small, and the piston rod is not easy to bend and deform; in addition, when the piston rod is completely extended out, the cylindrical piston rod has larger flexibility relative to the solid rod-shaped piston rod, and the generated bending deformation is larger, but when the cylinder retracts, the cylindrical piston rod has larger flexibility and the guide sleeve has a relatively longer axial distance, so that the piston rod automatically straightens back under the action of the pressure of the guide sleeve on the outer wall of the piston rod and the action of the pressure of high-pressure hydraulic oil on the inner wall of the piston rod.
Drawings
FIG. 1 is a schematic structural view of a conventional hydraulic jacking cylinder;
FIG. 2 is a schematic structural diagram of a hydraulic jacking cylinder according to the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is an enlarged view of a portion of FIG. 2 at B;
in the figure:
1-a cylinder barrel; 2-a piston rod; 3-a piston; 301-piston stem; 3011-an oil return flow channel; 302-a seal mounting ring; 303-an annular seal; 3031-an elastomer; 3032-a retainer ring; 4-oil cylinder ear ring; 401-oil inlet one; 402-oil inlet two; 403-oil inlet flow passage I; 404-oil inlet flow channel two; 405-bolt slot; 5-an oil delivery pipe; 6, a dustproof sleeve; 7-cylinder bottom of the oil cylinder; 8, a guide sleeve; 9-fixing screws; a 10-5 type Epert seal; 11-RU series seal; 12-a wear ring; type 13-K Teconster seal; 14-hoop; 15-guard element.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples.
As shown in fig. 2-4, a hydraulic jacking cylinder comprises a cylinder barrel 1, a piston rod 2, a piston 3, a cylinder ear 4, an oil delivery pipe 5, a dust-proof sleeve 6, a cylinder bottom 7 and a guide sleeve 8.
The section of the oil cylinder earring 4 is rectangular, and the rectangular oil cylinder earring 4 is convenient to fix and limit.
The piston rod 2 is in a cylindrical shape, the top of the piston rod 2 is fixedly connected with the oil cylinder lug 4, and the bottom of the piston rod 2 is fixedly connected with the piston 3.
The piston 3 comprises a piston stem 301, a seal mounting ring 302, and an annular seal 303. The top of the piston core column 301 is fixedly connected with the bottom of the piston rod 2. The sealing element mounting ring 302 is sleeved outside the piston core column 301 and is fixedly connected with the piston core column 301. In this embodiment, the seal mounting ring 302 is threadedly coupled to the piston stem 301. A fixing screw mounting groove is formed in the piston 3, and the axis of the fixing screw mounting groove is perpendicular to the axis of the piston 3. And a fixing screw 9 for limiting the relative rotation of the piston core column 301 and the sealing element mounting ring 302 is arranged in the fixing screw mounting groove. The outer diameter of the seal mounting ring 302 is smaller than the inner diameter of the cylinder barrel 1. The seal mounting ring 302 is provided with a ring of seal mounting grooves at the outer periphery, and the annular seal 303 is fixedly mounted in the seal mounting grooves.
In this embodiment, the annular seal member 303 includes an elastic body 3031 and two side retaining rings 3032, the cross section of the elastic body 3031 is convex, the cross section of the retaining ring 3032 is L-shaped, and the retaining ring 3032 is clamped at a step of the sealing ring mounting groove. The elastic body 3031 is used as a force application element filled with polytetrafluoroethylene, the retaining rings 3032 on the two sides are made of high-elasticity modulus materials, and the elastic body 3031 still has high rigidity and extrusion resistance at high temperature and high pressure, so that the extrusion resistance of the elastic body 3031 is improved.
The piston rod 2 and the piston 3 are arranged in the cylinder barrel 1, and the cylinder bottom 7 of the oil cylinder is fixedly connected to the bottom of the cylinder barrel 1 and seals the bottom of the cylinder barrel 1. The bottom surface of the oil cylinder bottom 7 is conical, so that the resistance is smaller when the hydraulic jacking oil cylinder is inserted into goods. The guide sleeve 8 is fixedly arranged at the top of the cylinder barrel 1 and seals a gap between the piston rod 2 and the cylinder barrel 1.
A plurality of sealing ring mounting grooves are axially formed in the inner wall of the guide sleeve 8, and sealing rings are respectively mounted in the sealing ring mounting grooves. In this embodiment, the sealing ring sequentially includes a 5-type elder seal 10, an RU-series seal 11, a wear-resistant ring 12, and a K-type tympaster seal 13 in a top-to-bottom direction of the piston rod 2. While the type K tecostat seal 13 alone as a piston rod seal has a relatively large leakage, and for better sealing a secondary seal is usually added, the RU series seal 11 is an ideal choice with cooperating primary and secondary lips to create a balanced operating point that is loaded most properly, with good resilience and flexibility.
The side wall of the oil cylinder earring 4 is provided with a first oil inlet 401 and a second oil inlet 402, and a first oil inlet flow passage 403 and a second oil inlet flow passage 404 which correspond to the first oil inlet 401 and the second oil inlet 402 are arranged inside the oil cylinder earring. The top of hydro-cylinder earrings 4 is equipped with bolt groove 405, the installation of the hydraulic jacking hydro-cylinder of being convenient for. The oil inlet flow channel I403 is connected with the oil delivery pipe 5, and the oil delivery pipe 5 penetrates through the piston rod 2 and the piston core column 301 and is communicated with the inner cavity of the cylinder barrel 1. And an oil return channel 3011 for communicating the inner cavity of the cylinder barrel 1 with the inner cavity of the piston rod 2 is arranged on the piston core column 301. The second oil inlet flow passage 404 is communicated with the inner cavity of the piston rod 2.
The dustproof sleeve 6 is sleeved on the periphery of the piston rod 2, the top of the dustproof sleeve 6 is installed on the oil cylinder ear ring 4 through an anchor ear 14, and the bottom of the dustproof sleeve 6 is installed on the cylinder barrel 1 through the anchor ear 14.
A protection piece 15 is fixedly arranged outside the cylinder barrel 1, the protection piece 15 is in a circular truncated cone shape, and the top of the protection piece 15 faces the cylinder bottom 7. The tower-shaped protection piece 15 is used for preventing the oil cylinder piston rod 2 from being scratched by particles and physically gouged by hanging objects.
According to the hydraulic jacking oil cylinder, the first oil inlet and the second oil inlet are arranged on the oil cylinder earrings, and the oil cylinder earrings are relatively fixed, so that an oil inlet pipeline connected with the first oil inlet and the second oil inlet cannot be driven by the movement of the cylinder body, and a connecting device used for connecting the oil inlet pipeline at the first oil inlet and the second oil inlet is not easy to damage; the cavity inside the piston rod is communicated with the cavity outside the piston rod through the oil return flow passage, so that the pressures inside and outside the piston rod inside the cylinder barrel are equal in the jacking process of the cylinder, the radial unbalance loading force on the piston rod is small, and the piston rod is not easy to bend and deform; in addition, when the piston rod is completely extended out, the cylindrical piston rod has larger flexibility relative to the solid rod-shaped piston rod, and the generated bending deformation is larger, but when the cylinder retracts, the cylindrical piston rod has larger flexibility and the guide sleeve has a relatively longer axial distance, so that the piston rod automatically straightens back under the action of the pressure of the guide sleeve on the outer wall of the piston rod and the action of the pressure of high-pressure hydraulic oil on the inner wall of the piston rod.
Other embodiments of the present invention than the preferred embodiments described above will be apparent to those skilled in the art from the present invention, and various changes and modifications can be made therein without departing from the spirit of the present invention as defined in the appended claims.
Claims (9)
1. The hydraulic jacking oil cylinder is characterized by comprising a cylinder barrel, a piston rod, a piston, an oil cylinder lug ring, an oil conveying pipe, an oil cylinder bottom and a guide sleeve, wherein the piston rod is in a cylindrical shape, the top of the piston rod is fixedly connected with the oil cylinder lug ring, the bottom of the piston rod is fixedly connected with the piston, the piston comprises a piston core column, a sealing element mounting ring and an annular sealing element, the top of the piston core column is fixedly connected with the bottom of the piston rod, the sealing element mounting ring is sleeved outside the piston core column and fixedly connected with the piston core column, the outer diameter of the sealing element mounting ring is smaller than the inner diameter of the cylinder barrel, the sealing element mounting ring is provided with a circle of sealing element mounting groove at the periphery, the annular sealing element is fixedly mounted in the sealing element mounting groove, the piston rod and the piston are arranged in the cylinder barrel, and the oil cylinder bottom is fixedly connected with the bottom of, the guide sleeve is fixedly arranged at the top of the cylinder barrel and used for blocking a gap between the piston rod and the cylinder barrel, a first oil inlet and a second oil inlet are formed in the side wall of the oil cylinder earring, a first oil inlet flow channel and a second oil inlet flow channel which correspond to the first oil inlet and the second oil inlet are formed in the oil cylinder earring, the first oil inlet flow channel is connected with the oil conveying pipe, the oil conveying pipe penetrates through the piston rod and the piston core column and is communicated with the inner cavity of the cylinder barrel, the piston core column is provided with a communicating oil return flow channel, the inner cavity of the cylinder barrel is communicated with the inner cavity of the piston rod, and the second oil inlet.
2. The hydraulic jacking cylinder as claimed in claim 1, wherein a plurality of seal ring mounting grooves are axially formed in an inner wall of the guide sleeve, seal rings are respectively mounted in the seal ring mounting grooves, and the seal rings sequentially include a 5-type Elett seal, an RU series seal, a wear-resistant ring, and a K-type Teconster seal in a top-to-bottom direction of the piston rod.
3. The hydraulic jacking cylinder as claimed in claim 1, wherein the annular sealing member comprises an elastic body and two side retaining rings, the cross section of the elastic body is in a convex shape, the cross section of each retaining ring is in an L shape, and the retaining rings are clamped at the steps of the sealing ring mounting grooves.
4. The hydraulic jacking cylinder according to claim 1, further comprising a dust-proof cover, wherein the dust-proof cover is arranged on the periphery of the piston rod, the top of the dust-proof cover is mounted on the cylinder ear ring through an anchor ear, the bottom of the dust-proof cover is mounted on the cylinder barrel through an anchor ear, and the dust-proof cover is a zipper-type dust-proof cover.
5. The hydraulic jacking cylinder of claim 1, wherein said cylinder ears are rectangular in cross-section.
6. The hydraulic jacking cylinder of claim 1, wherein a top end of said cylinder ear is provided with a bolt slot.
7. The hydraulic jacking cylinder as claimed in claim 1, wherein the piston is provided with a fixing screw mounting groove, an axis of the fixing screw mounting groove is perpendicular to an axis of the piston, and a fixing screw for limiting the relative rotation of the piston core column and the sealing member mounting ring is arranged in the fixing screw mounting groove.
8. The hydraulic jacking cylinder as claimed in claim 1, wherein a bottom surface of said cylinder bottom is conical.
9. The hydraulic jacking cylinder as claimed in claim 1, wherein a guard member is fixedly disposed outside the cylinder barrel, the guard member is in the shape of a circular truncated cone, and the top of the guard member faces the bottom of the cylinder barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110331615.2A CN113090608B (en) | 2021-03-29 | 2021-03-29 | Hydraulic jacking oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110331615.2A CN113090608B (en) | 2021-03-29 | 2021-03-29 | Hydraulic jacking oil cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113090608A true CN113090608A (en) | 2021-07-09 |
| CN113090608B CN113090608B (en) | 2023-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110331615.2A Active CN113090608B (en) | 2021-03-29 | 2021-03-29 | Hydraulic jacking oil cylinder |
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| Country | Link |
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| CN (1) | CN113090608B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57167507A (en) * | 1981-04-03 | 1982-10-15 | Mitsubishi Heavy Ind Ltd | Variable output cylinder |
| CN205503617U (en) * | 2015-12-31 | 2016-08-24 | 徐州重型机械有限公司 | Flexible hydro -cylinder structure |
| CN107401533A (en) * | 2017-08-08 | 2017-11-28 | 华南理工大学 | A kind of end control type internal-expansion type mechanical interlocking hydraulic jack and its operation method |
| CN108374812A (en) * | 2018-05-17 | 2018-08-07 | 马鞍山纽盟知识产权管理服务有限公司 | A kind of hydraulic cylinder |
| CN209228766U (en) * | 2018-11-15 | 2019-08-09 | 徐州顺隆液压科技有限公司 | A kind of hydraulically extensible oil |
-
2021
- 2021-03-29 CN CN202110331615.2A patent/CN113090608B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57167507A (en) * | 1981-04-03 | 1982-10-15 | Mitsubishi Heavy Ind Ltd | Variable output cylinder |
| CN205503617U (en) * | 2015-12-31 | 2016-08-24 | 徐州重型机械有限公司 | Flexible hydro -cylinder structure |
| CN107401533A (en) * | 2017-08-08 | 2017-11-28 | 华南理工大学 | A kind of end control type internal-expansion type mechanical interlocking hydraulic jack and its operation method |
| CN108374812A (en) * | 2018-05-17 | 2018-08-07 | 马鞍山纽盟知识产权管理服务有限公司 | A kind of hydraulic cylinder |
| CN209228766U (en) * | 2018-11-15 | 2019-08-09 | 徐州顺隆液压科技有限公司 | A kind of hydraulically extensible oil |
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| Publication number | Publication date |
|---|---|
| CN113090608B (en) | 2023-10-13 |
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