CN111306135B - Single-rod multi-stroke hydraulic cylinder - Google Patents
Single-rod multi-stroke hydraulic cylinder Download PDFInfo
- Publication number
- CN111306135B CN111306135B CN201911073184.3A CN201911073184A CN111306135B CN 111306135 B CN111306135 B CN 111306135B CN 201911073184 A CN201911073184 A CN 201911073184A CN 111306135 B CN111306135 B CN 111306135B
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- piston
- piston rod
- hydraulic cylinder
- sleeve
- rod
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- 238000007789 sealing Methods 0.000 claims description 21
- 239000010720 hydraulic oil Substances 0.000 abstract description 18
- 239000003921 oil Substances 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
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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
-
- 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
- F15B15/1447—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
- F15B15/08—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
-
- 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
-
- 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
- F15B15/1471—Guiding means other than in the end cap
-
- 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
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
-
- 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
- F15B15/24—Other details, e.g. assembly with regulating devices for restricting the stroke
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention discloses a single-rod multi-stroke hydraulic cylinder which comprises a cylinder body, a piston rod and a piston, wherein a stroke adjusting mechanism is arranged on the piston rod and comprises a plurality of telescopic sleeves which are sequentially nested, the telescopic sleeve positioned at the innermost side is fixedly sleeved on the piston rod, an axial limiting mechanism is arranged between every two adjacent telescopic sleeves, a tension spring is arranged between the end parts of every two adjacent telescopic sleeves, a limiting block used for limiting the telescopic sleeve at the outermost side is arranged on the inner wall of the cylinder body, and a guide sleeve which plays a role in guiding the piston rod is arranged at one end of the cylinder body. The invention enables the hydraulic cylinder to have various different strokes by adjusting the pressure of the hydraulic oil, thereby meeting the use requirements of specific occasions.
Description
Technical Field
The invention relates to a hydraulic cylinder, in particular to a single-rod multi-stroke hydraulic cylinder.
Background
The hydraulic cylinder is a hydraulic actuating element which converts hydraulic energy into mechanical energy and makes linear reciprocating motion, has simple structure and reliable work, can omit a speed reducer when realizing reciprocating motion, has no transmission clearance and moves stably, thereby being widely applied to hydraulic systems of various machines. The existing hydraulic cylinder generally comprises a cylinder body, a piston rod and a piston, wherein oil ports are respectively arranged at two ends of the cylinder body, and the piston is pushed to move by the pressure of hydraulic oil, so that the piston rod moves along an axis. Under some specific work occasions, the hydraulic cylinder is required to have multiple different strokes to meet the use requirements, and the existing hydraulic cylinder generally has a single working stroke and only has one stroke, so that the use requirements of the specific work occasions cannot be met.
Such as: the Chinese patent publication No. CN206682070U discloses a hydraulic cylinder, which is characterized by comprising a cylinder barrel, a cylinder bottom fixedly arranged at one end of the cylinder barrel and sealing the cylinder barrel, and a piston assembly inserted in the cylinder barrel, the piston assembly comprises a piston and a piston rod detachably and fixedly connected to the piston, one end of the piston rod, which is far away from the cylinder bottom, protrudes out of the cylinder barrel, a pressure relief through groove is arranged on the side wall of the cylinder bottom, a through hole is arranged on the side wall of the pressure relief through groove facing the cylinder barrel, a flow safety valve is connected in the pressure relief through groove in a threaded manner, an oil plug which is abutted against the flow safety valve is connected at one end of the pressure relief through groove in a threaded manner, the other end of the pressure relief through groove is in threaded connection with the iron oil plug, the diameter of the iron oil plug is larger than that of the oil plug, the technical effect that the return flow is increased sharply due to the fact that an external pipeline is broken is achieved, and the load cannot fall instantly to cause danger is guaranteed. The hydraulic cylinder has the following disadvantages: under some specific work occasions, the hydraulic cylinder is required to have multiple different strokes to meet the use requirements, and the hydraulic cylinder has a single working stroke and only has one stroke, so that the use requirements of the specific work occasions cannot be met.
Disclosure of Invention
The invention aims to solve the problem that a hydraulic cylinder is required to have various different strokes to meet the use requirement in certain specific working occasions, and the traditional hydraulic cylinder has a single working stroke and only has one stroke and cannot meet the use requirement in the specific working occasions.
The purpose of the invention is realized by the following technical scheme: the utility model provides a single pole multi-stroke pneumatic cylinder, includes cylinder body, piston rod, piston, be provided with stroke adjustment mechanism on the piston rod, stroke adjustment mechanism includes a plurality of nested telescope tube in proper order, is located the fixed cover of the telescope tube of the most inboard and establishes on the piston rod, is provided with axial stop gear between two adjacent telescope tube, is provided with the extension spring between two adjacent telescope tube's the tip, is provided with on the cylinder body inner wall to be used for carrying out spacing stopper to the telescope tube in the outside, the one end of cylinder body is provided with the uide bushing that plays the guide effect to the piston rod.
In the invention, the stroke of the hydraulic cylinder can be adjusted by controlling the pressure of the hydraulic oil. The rigidity of the tension spring is gradually increased from the inner side to the outer side. When the piston rod of the hydraulic cylinder moves, when the telescopic sleeve on the outermost side is abutted to the limiting block, if the force for pushing the piston to advance by hydraulic oil is smaller than the pretension force of the tension spring on the outermost side, the piston rod moves to the position and stops, and therefore the hydraulic cylinder has a first stroke. If the pressure of hydraulic oil is increased, the force of the hydraulic oil pushing the piston to move forwards is larger than the pre-tensioning force of the tension spring on the outermost side but smaller than the pre-tensioning force of the second tension spring on the outer side, the second telescopic sleeve on the outermost side can move forwards continuously after the telescopic sleeve on the outermost side is abutted to the limiting block, the moving distance of the second telescopic sleeve on the outermost side relative to the telescopic sleeve on the outermost side is limited through the axial limiting mechanism, and therefore the hydraulic cylinder is enabled to have the second stroke. By analogy, if the pressure of the hydraulic oil is continuously increased, the force of the hydraulic oil pushing the piston to move forwards is greater than the pretension force of the second tension spring at the outermost side but less than the pretension force of the third tension spring at the outer side, so that the hydraulic cylinder can have the third stroke. The invention enables the hydraulic cylinder to have various different strokes by adjusting the pressure of the hydraulic oil, thereby meeting the use requirements of specific occasions.
Preferably, a first oil port and a second oil port are respectively formed at two ends of the cylinder body.
Preferably, the piston comprises a piston body, the piston body is in threaded connection with one end of the piston rod, a sealing ring is embedded on the piston body, and the sealing ring is in sealing fit with the inner wall of the cylinder body.
Preferably, the guide sleeve is annular, the guide sleeve is in threaded connection with one end of the cylinder body, a sealing ring is embedded on the inner annular surface of the guide sleeve, and the sealing ring is in sealing fit with the piston rod. The guide sleeve plays a guiding role in the piston rod, and the sealing ring arranged on the guide sleeve can prevent hydraulic oil from leaking out of a gap between the guide sleeve and the piston rod.
Preferably, the minimum distance from the limiting block to the center line of the piston rod is larger than the inner diameter of the outermost telescopic sleeve and smaller than the outer diameter of the outermost telescopic sleeve.
Preferably, the axial limiting mechanism comprises a convex block and a sliding groove, the convex block is arranged on the outer annular surface of the inner telescopic sleeve, the sliding groove is arranged on the inner annular surface of the outer telescopic sleeve, and the convex block is embedded into the sliding groove. The axial limiting mechanism is used for limiting the relative movement distance of the two adjacent telescopic sleeves.
Preferably, the sliding groove is provided along an axial direction of the telescopic sleeve.
The invention has the beneficial effects that: the invention enables the hydraulic cylinder to have various different strokes by adjusting the pressure of the hydraulic oil, thereby meeting the use requirements of specific occasions.
Drawings
Fig. 1 is a cross-sectional view of the present invention.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is an enlarged view of a portion B in fig. 1.
Fig. 4 is an enlarged view of the portion C in fig. 1.
In the figure: 1. the piston comprises a cylinder body, 2, a piston rod, 3, a piston body, 4, a guide sleeve, 5, a first oil port, 6, a second oil port, 8, a sealing ring, 9, a sealing ring, 10, a first telescopic sleeve, 11, a second telescopic sleeve, 12, a third telescopic sleeve, 13, a first sliding groove, 14, a second sliding groove, 15, a first lug, 16, a second lug, 17, a first tension spring, 18, a second tension spring, 19 and a limiting block.
Detailed Description
The invention is further described by the following detailed description in conjunction with the accompanying drawings.
Example 1:
as shown in fig. 1 to 4, the single-rod multi-stroke hydraulic cylinder comprises a cylinder body 1, a piston rod 2 and a piston. A first oil port 5 and a second oil port 6 are respectively arranged at two ends of the cylinder body 1. The piston is connected to one end of a piston rod 2. The piston comprises a piston body 3. The piston is located in the cylinder 1. The piston body 3 is in threaded connection with the piston rod 2. The piston body 3 is provided with a sealing ring 9. The sealing ring 9 is in sealing fit with the inner wall of the cylinder body 1. One end of the cylinder body 1 is provided with a guide sleeve 4. The guide sleeve 4 is annular. The outer annular surface of the guide sleeve 4 is provided with external threads. The guide sleeve 4 is screwed on the end of the cylinder body 1. One end of the piston rod 2 passes through the guide sleeve 4 and extends out of the cylinder body 1. And a sealing ring 8 is embedded on the inner ring surface of the guide sleeve 4. The sealing ring 8 is in sealing fit with the piston rod 2.
The piston rod 2 is provided with a stroke adjusting mechanism. The stroke adjusting mechanism comprises a plurality of telescopic sleeves which are nested in sequence. The telescopic sleeve positioned at the innermost side is fixedly sleeved on the piston rod 2. In this embodiment, three telescopic sleeves are provided, which are respectively a first telescopic sleeve 10, a second telescopic sleeve 11 and a third telescopic sleeve 12. The first telescopic sleeve 10, the second telescopic sleeve 11 and the third telescopic sleeve 12 are all cylindrical. The first telescopic sleeve 10 is located innermost and the third telescopic sleeve 12 is located outermost. The first telescopic sleeve 10 is fixedly sleeved on the piston rod 2. A first tension spring 17 is arranged between one end of the first telescopic sleeve 10 and one end of the second telescopic sleeve 11. A second tension spring 18 is arranged between one end of the second telescopic sleeve 11 and one end of the third telescopic sleeve 12. The first telescopic sleeve 10 is provided with a first protrusion 15 on the outer circumferential surface thereof, and the second telescopic sleeve 11 is provided with a first sliding groove 13 on the inner circumferential surface thereof. The first slide groove 13 is provided along the axial direction of the second telescopic tube 11. The first projection 15 is inserted into the first sliding groove 13. The second telescopic tube 11 has a second protrusion 16 formed on an outer circumferential surface thereof. The inner annular surface of the third telescopic sleeve 12 is provided with a second sliding chute 14. The second runner 14 is disposed along the axial direction of the third telescopic sleeve 12. The second projection 16 is embedded in the second runner 14. And a limiting block 19 for limiting the third telescopic sleeve 12 is arranged on the inner wall of the cylinder body 1. The minimum distance from the limiting block 19 to the center line of the piston rod 2 is larger than the inner diameter of the third telescopic sleeve 12 and smaller than the outer diameter of the third telescopic sleeve 12.
In the invention, the stroke of the hydraulic cylinder can be adjusted by controlling the pressure of the hydraulic oil. The rigidity of the tension spring is gradually increased from the inner side to the outer side. When the piston rod of the hydraulic cylinder moves, when the third telescopic sleeve is abutted to the limiting block, if the force for pushing the piston to move forwards by hydraulic oil is smaller than the pre-tensioning force of the tension spring at the outermost side, the piston rod moves to the position and stops, and therefore the hydraulic cylinder has a first stroke. If the pressure of hydraulic oil is improved, the force of the hydraulic oil pushing the piston to move forwards is larger than the pre-tensioning force of the second tension spring but smaller than the pre-tensioning force of the first tension spring, and at the moment, the second telescopic sleeve can continue to move forwards after the third telescopic sleeve is abutted to the limiting block, so that the hydraulic cylinder has a second stroke. By analogy, if the pressure of the hydraulic oil is continuously increased, the force of the hydraulic oil for pushing the piston to move forwards is larger than the pretensioning force of the first tension spring, so that the hydraulic cylinder can have a third stroke. The invention enables the hydraulic cylinder to have various different strokes by adjusting the pressure of the hydraulic oil, thereby meeting the use requirements of specific occasions.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (6)
1. The utility model provides a single pole multiple-stroke hydraulic cylinder, includes cylinder body, piston rod, piston, its characterized in that: the stroke adjusting mechanism is arranged on the piston rod and comprises a plurality of telescopic sleeves which are sequentially nested, the telescopic sleeve which is positioned at the innermost side is fixedly sleeved on the piston rod, an axial limiting mechanism is arranged between every two adjacent telescopic sleeves, a tension spring is arranged between the end parts of every two adjacent telescopic sleeves, a limiting block for limiting the telescopic sleeve at the outermost side is arranged on the inner wall of the cylinder body, and a guide sleeve which plays a role of guiding the piston rod is arranged at one end of the cylinder body; the axial limiting mechanism comprises a convex block and a sliding groove, the convex block is arranged on the outer annular surface of the telescopic sleeve on the inner side, the sliding groove is arranged on the inner annular surface of the telescopic sleeve on the outer side, and the convex block is embedded into the sliding groove.
2. The single-rod multi-stroke hydraulic cylinder as recited in claim 1 wherein the cylinder body has a first port and a second port disposed at each end.
3. The single-rod multi-stroke hydraulic cylinder as claimed in claim 1, wherein the piston comprises a piston body, the piston body is screwed at one end of the piston rod, and a sealing ring is embedded on the piston body and is in sealing fit with the inner wall of the cylinder body.
4. The single-rod multi-stroke hydraulic cylinder as claimed in claim 1, wherein the guide sleeve is annular, the guide sleeve is connected to one end of the cylinder body in a threaded manner, a sealing ring is embedded on the inner annular surface of the guide sleeve, and the sealing ring is in sealing fit with the piston rod.
5. The single rod, multi-stroke hydraulic cylinder as recited in claim 1 wherein the minimum distance from the stop block to the centerline of the piston rod is greater than the inside diameter of the outermost telescoping sleeve and less than the outside diameter of the outermost telescoping sleeve.
6. A single rod, multi-stroke hydraulic cylinder as claimed in claim 1 wherein said runner is disposed axially of the telescopic sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911073184.3A CN111306135B (en) | 2019-11-05 | 2019-11-05 | Single-rod multi-stroke hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911073184.3A CN111306135B (en) | 2019-11-05 | 2019-11-05 | Single-rod multi-stroke hydraulic cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111306135A CN111306135A (en) | 2020-06-19 |
| CN111306135B true CN111306135B (en) | 2022-02-11 |
Family
ID=71158214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911073184.3A Active CN111306135B (en) | 2019-11-05 | 2019-11-05 | Single-rod multi-stroke hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111306135B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03194201A (en) * | 1989-12-22 | 1991-08-23 | Daikin Mfg Co Ltd | Three-position actuator |
| CN1297114A (en) * | 1999-11-22 | 2001-05-30 | 速睦喜股份有限公司 | Two-stroke cylinder |
| CN102563056A (en) * | 2010-12-13 | 2012-07-11 | 通用汽车环球科技运作有限责任公司 | Single-piston three-position hydraulic actuator |
| CN204226333U (en) * | 2014-11-17 | 2015-03-25 | 山东兴田机械有限公司 | The adjustable hydraulic jack of a kind of stroke |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3978717B2 (en) * | 2002-01-22 | 2007-09-19 | Ｓｍｃ株式会社 | 3-position stop cylinder |
-
2019
- 2019-11-05 CN CN201911073184.3A patent/CN111306135B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03194201A (en) * | 1989-12-22 | 1991-08-23 | Daikin Mfg Co Ltd | Three-position actuator |
| CN1297114A (en) * | 1999-11-22 | 2001-05-30 | 速睦喜股份有限公司 | Two-stroke cylinder |
| CN102563056A (en) * | 2010-12-13 | 2012-07-11 | 通用汽车环球科技运作有限责任公司 | Single-piston three-position hydraulic actuator |
| CN204226333U (en) * | 2014-11-17 | 2015-03-25 | 山东兴田机械有限公司 | The adjustable hydraulic jack of a kind of stroke |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111306135A (en) | 2020-06-19 |
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Address after: No. 4387 Jianshe Fourth Road, Xinjie Street, Xiaoshan District, Hangzhou City, Zhejiang Province, 311217 Patentee after: Zhejiang Avant Hydraulic Technology Co.,Ltd. Address before: 311200 yuansha village, Xinjie street, Xiaoshan District, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG AFANTE PREC EQUIPMENT MFG Co.,Ltd. |
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