CN106762935A - Outward leakage combination sealing design in spiral swing hydranlic pressure jar - Google Patents
Outward leakage combination sealing design in spiral swing hydranlic pressure jar Download PDFInfo
- Publication number
- CN106762935A CN106762935A CN201710047183.6A CN201710047183A CN106762935A CN 106762935 A CN106762935 A CN 106762935A CN 201710047183 A CN201710047183 A CN 201710047183A CN 106762935 A CN106762935 A CN 106762935A
- Authority
- CN
- China
- Prior art keywords
- working shaft
- wedge
- bearing
- ball
- cover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- F15B15/12—Characterised by the construction of the motor unit of the oscillating-vane or curved-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
- F15B15/20—Other details, e.g. assembly with regulating devices
Abstract
Designed the invention discloses outward leakage combination sealing in a kind of spiral swing hydranlic pressure jar, including swing hydraulic pressure cylinder, swing hydraulic pressure cylinder includes working shaft (1), bearing (ball) cover (2), cylinder barrel (3), stator blade, movable vane piece, wedge inner seal liner (6) and wedge outside seal (7), stator blade is fixed in cylinder barrel, and bearing (ball) cover is arranged at the both sides nozzle of cylinder barrel.Movable vane piece is located on working shaft, and movable vane piece is an entirety with working shaft, and working shaft is enclosed within bearing (ball) cover and cylinder barrel.Wedge inner seal liner is arranged on the junction of bearing (ball) cover and the working shaft shaft shoulder (16), indenture is offered on the face that wedge outside seal is contacted with wedge inner seal liner, wedge outside seal is axially contacted along working shaft with wedge inner seal liner, and O-ring one is provided between wedge outside seal and bearing (ball) cover.Sealing intensity of the present invention changes and changes according to inside cavity oil pressure, extends the service life of polytetrafluoroethylene (PTFE).
Description
Technical field
Designed the present invention relates to outward leakage combination sealing in hydraulic cylinder, more particularly to a kind of spiral swing hydranlic pressure jar.
Background technology
Mainly there are two kinds of type of drive in today, main flow robot, and one kind is that motor drives, and one kind is hydraulic-driven, motor
Driven machine people's control accuracy is high, but output torque is small, restricted application.Hydraulic-driven machine people output torque is big, can
It is applied widely to move heavy objects.
Hydraulic machine person joint needs to provide larger torque using swinging type rotary hydraulic cylinder, and the sealing problem of cylinder is skill
Art is crucial.Prior art (the patent No.：CN105952707A it is) sealing that prevents internal leakage, it is close at the shaft shoulder with cylinder body in axle
Envelope uses teflin ring, and extruding polytetrafluoroethylene (PTFE) with disc spring increases sealing intensity.But the technology prevents interior leakage
It is larger that two parts of sealing and outward leakage sealing occupy axial dimension, and internal leakage sealing extrudes lattice polytetrafluoroethylene (PTFE) circle using disc spring
Sealing, sealing intensity is determined by disc spring compressive deformation amount, and intensity will not change with oil pressure size variation in cavity.For a long time
High intensity extrudes polytetrafluoroethylene (PTFE), causes polytetrafluoroethylene (PTFE) service life to shorten.
And robot uses hydraulic cylinder, simply exported using high pulling torque in the case of some interruptions, ordinary circumstance cavity of resorption
Internal oil pressure is not very big, it is not necessary to the sealing of so big intensity, but needs to be changed according to oil pressure in cavity and changed
Sealing.
The content of the invention
It is an object of the invention to be directed to the problem that above-mentioned prior art is present, there is provided a kind of improved spiral swing hydranlic pressure jar
Interior outward leakage combination sealing design.
The present invention solves its technical problem and is achieved through the following technical solutions：
Outward leakage combination sealing design in spiral swing hydranlic pressure jar, including swing hydraulic pressure cylinder, the swing hydraulic pressure cylinder include work
Make axle (1), bearing (ball) cover (2), cylinder barrel (3), stator blade, movable vane piece, wedge inner seal liner (6) and wedge outside seal (7), institute
State stator blade to be fixed in cylinder barrel (3), the bearing (ball) cover (2) is arranged at the both sides nozzle of cylinder barrel (3)；The movable vane piece is located at
On working shaft (1), the movable vane piece and working shaft (1) are an entirety, and the working shaft (1) is enclosed within bearing (ball) cover (2) and cylinder
In cylinder (3), rolling bearing (8) is installed between the bearing (ball) cover (2) and working shaft (1)；
Wedge inner seal liner (6) and wedge outside seal (7) are arranged on bearing (ball) cover (2) and join with the working shaft shaft shoulder (16)
Place, the wedge inner seal liner (6) is sealingly mounted between bearing (ball) cover (2) and the working shaft shaft shoulder (16), and the wedge is outer close
Sealing (7) is contacted on working shaft (1) axial direction away from the working shaft shaft shoulder (16) with wedge inner seal liner (6), and described
Wedge outside seal (7) is sealed on working shaft (1), and O shapes are provided between the wedge outside seal (7) and bearing (ball) cover (2)
Circle one (10), indenture (12) is offered on the face that the wedge outside seal (7) contacts with wedge inner seal liner (6).
Further, the movable vane piece on the top surface of working shaft (1) away from offering along axially extending recessed of working shaft (1)
Groove one, and two sides of the movable vane piece offer the groove two radially extended along working shaft (1), the groove one is connected
Groove two；The stator blade is offered along the axially extending groove three of working shaft (1) on the top surface of working shaft (1), described
Two sides of stator blade offer the groove four radially extended along working shaft (1), the groove tee joint groove four；
Movable vane piece butadiene acrylonitrile rubber sealing ring (5) and movable vane piece teflin ring (4) are embedded with groove one and groove two,
And working shaft (1) in the radial direction the movable vane piece butadiene acrylonitrile rubber sealing ring (5) positioned at movable vane piece teflin ring (4)
Inner side, movable vane piece teflin ring (4) contacts with cylinder barrel (3)；
Stator blade butadiene acrylonitrile rubber sealing ring and stator blade teflin ring are embedded with groove three and groove four, and in work
The stator blade butadiene acrylonitrile rubber sealing ring is described positioned at the inner side of stator blade teflin ring in the radial direction to make axle (1)
Stator blade teflin ring is contacted with working shaft (1).
Further, wedge inner seal liner (6) uses polytetrafluoroethylene (PTFE), and wedge outside seal (7) is using poly- containing copper powder
Tetrafluoroethene.
Further, the rolling bearing (8) is provided with back-up ring (9) away from one end of cylinder barrel (3).
Further, it is provided with O-ring two (11) in the crack between the cylinder barrel (3) and bearing (ball) cover (2).
Beneficial effects of the present invention are：
The present invention is combined design using O-ring and polytetrafluoroethylene (PTFE), is carried out using the sealing principle of similar Glais ring
Outward leakage is sealed, and sealing intensity changes and changes according to inside cavity oil pressure, not only ensure that sealing but also has been extended polytetrafluoroethylene (PTFE)
Service life.Modular design improves the prior art (patent No.：CN105952707A interior leakage sealing and outward leakage sealing),
Reduce hydraulic cylinder axial dimension, hydraulic cylinder total quality mitigates, so as to be more beneficial for the design of joint of robot so that machine
People's total quality meets design requirement.
Brief description of the drawings
Fig. 1 is swing hydraulic pressure cylinder structure schematic diagram of the present invention；
Fig. 2 is the structure enlarged diagram at S in Fig. 1；
Fig. 3 is the structural representation of wedge outside seal；
Fig. 4 is swing hydraulic pressure cylinder overall structure diagram of the present invention；
Fig. 5 is movable vane piece and working shaft overall structure diagram；
Fig. 6 is bearing (ball) cover structural representation.
Description of reference numerals
1- working shafts, 2- bearing (ball) covers, 3- cylinder barrels, 4- movable vane pieces teflin ring, 5- movable vane piece butadiene acrylonitrile rubbers are close
Seal, 6- wedges inner seal liner, 7- wedges outside seal, 8- rolling bearings, 9- back-up rings, 10-O shapes circle one, 11-O shapes circle two,
12- indentures, 13- first chambers, 14- second chambers, 15- bolts, the 16- working shaft shaft shoulders.
Specific embodiment
Below by specific embodiment, the invention will be further described, and following examples are descriptive, is not limit
Qualitatively, it is impossible to which protection scope of the present invention is limited with this.
As shown in Figures 1 to 6, outward leakage combination sealing design in spiral swing hydranlic pressure jar, including swing hydraulic pressure cylinder, hydraulic pressure pendulum
Dynamic cylinder includes working shaft 1, bearing (ball) cover 2, cylinder barrel 3, stator blade, movable vane piece, wedge inner seal liner 6 and wedge outside seal 7.Institute
Stating movable vane piece and stator blade has two, so in oil suction chamber and goes out that oil pocket pressure difference is constant, and movable vane piece and stator blade side are received
Output torque is increased to original 2 times in the case that power area is constant, and pendulum angle narrows down to original 1/2.Movable vane piece is located at
On working shaft 1, movable vane piece is an entirety with working shaft 1.Bolt hole is offered on stator blade, stator blade is bolted on
In cylinder barrel 3.Working shaft 1 is enclosed within cylinder barrel 3, and bearing (ball) cover 2 is arranged on two side necks of cylinder barrel 3 through working shaft 1 and by bolt
Mouthful, stator blade and movable vane piece are arranged in a crossed manner.Bearing (ball) cover 2 is connected by rolling bearing 8 with working shaft 1, and rolling bearing 8 is away from cylinder
One end of cylinder 3 is provided with back-up ring 9, and being provided for of back-up ring 9 fixes axial location of the rolling bearing 8 relative to working shaft 1.
Movable vane piece away from being offered on the top surface of working shaft 1 along the axially extending groove one of working shaft 1, and movable vane piece two
Individual side offers the groove two radially extended along working shaft 1, the communication groove two of groove one.Stator blade is near working shaft 1
Offered on top surface along the axially extending groove three of working shaft 1, two sides of stator blade offer prolongs along the radial direction of working shaft 1
The groove four stretched, groove tee joint groove four.
Movable vane piece butadiene acrylonitrile rubber sealing ring 5 and movable vane piece teflin ring 4 are embedded in the groove one and groove of movable vane piece
In two, and movable vane piece butadiene acrylonitrile rubber sealing ring 5 is located in movable vane piece teflin ring 4 in the radial direction in working shaft 1
Side, movable vane piece teflin ring 4 is contacted with cylinder barrel 3.Design herein prevents movable vane piece and the directly contact of cylinder barrel 3, causes
Larger frictional resistance, polytetrafluoroethylene (PTFE) has self-lubricating function, contacted with cylinder barrel 3 friction it is smaller, produced with cylinder barrel 3 in movable vane piece
Larger resistance is not had when raw relative motion, and the effect for making oil suction chamber and going out oil pocket isolation is served again.
Stator blade butadiene acrylonitrile rubber sealing ring and stator blade teflin ring are embedded in the groove three and groove four of stator blade
In, and stator blade butadiene acrylonitrile rubber sealing ring is quiet positioned at the inner side of stator blade teflin ring in the radial direction in working shaft 1
Blade teflin ring is contacted with working shaft 1.Design herein prevents stator blade and the directly contact of working shaft 1, cause compared with
Big frictional resistance, polytetrafluoroethylene (PTFE) has self-lubricating function, and it is smaller to contact friction with working shaft 1, in stator blade and working shaft 1
Larger resistance is not had when producing relative motion, and the effect for making oil suction chamber and going out oil pocket isolation is served again.
Wedge inner seal liner 6, wedge outside seal 7 and O-ring 1 composition bearing (ball) cover 2 join with the working shaft shaft shoulder 16
The sealing mechanism at place, wedge inner seal liner 6 and wedge outside seal 7 are arranged on bearing (ball) cover 2 and the junction of the working shaft shaft shoulder 16,
Wedge inner seal liner 6 is sealingly mounted between bearing (ball) cover 2 and the working shaft shaft shoulder 16.Wedge outside seal 7 is away from working shaft
Contacted with wedge inner seal liner 6 on the axial direction of working shaft 1 of the shaft shoulder 16, and wedge outside seal 7 is sealed on working shaft 1.
O-ring 1 is provided between wedge outside seal 7 and bearing (ball) cover 2, wedge outside seal 7 is contacted with wedge inner seal liner 6
Indenture 12 is offered on face.The structure of elastic pressure and wedge inner seal liner 6, wedge outside seal 7 in O-ring 1 is made
Under, the interior leakage caused by bearing (ball) cover 2 and the working shaft shaft shoulder 16 can be prevented.If bearing (ball) cover 2 and the working shaft shaft shoulder 16
Between have gap, then actually oil suction chamber and go out oil pocket and just communicated by side annular gap, thus cause interior letting out
Leakage.Hydraulic oil may be leaked by the gap between M and N two, and first chamber 13 and second chamber 14 are flowed to respectively, stream
There is pressure extruding O-ring 1 in the hydraulic oil to first chamber 13, O-ring 1 produces deformation so as to extrude wedge external seal
Part 7, makes wedge outside seal 7 have one to the axial direction of working shaft 1 and the power to the radial direction of working shaft 1, wedge external seal
What part 7 was produced pushes dynamic wedge inner seal liner 6, and wedge inner seal liner 6 is bigger to the extruding force of working shaft 1 and bearing (ball) cover 2, from
And reduce internal leakage.Indenture 12 is primarily to realize that first chamber 13 and second chamber 14 are communicated, it is ensured that the He of first chamber 13
The oil pressure of second chamber 14 is identical, prevents second chamber 14 from revealing oil pressure larger, and the leakage oil pressure of first chamber 13 is relative to the
Two chambers 14 are smaller, and such first chamber 13 is not big enough to the pressure distortion that O-ring is produced, and cause wedge outside seal 7 to axle
The pressure of generation is smaller, so that the oil of first chamber 13 is leaked along working shaft 1.
Wedge inner seal liner 6 uses polytetrafluoroethylene (PTFE), and wedge outside seal 7 is using the polytetrafluoroethylene (PTFE) containing copper powder, cupric
The polytetrafluoroethylene (PTFE) rigidity of powder is more than polytetrafluoroethylene (PTFE), and wedge outside seal 7 is unlikely to deform.
O-ring 2 11 is provided with crack between cylinder barrel 3 and bearing (ball) cover 2, by the deformable squeeze cylinder barrel of O-ring
Wall, forms static friction, reaches the static seal effect of outward leakage.
One end of working shaft 1 is provided with angular encoder, and angular encoder is connected with working shaft 1 using shaft coupling, is worked
The rotation of axle 1 drives the axle of angular encoder to rotate so that angular encoder output pulse signal is sent to control panel.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (5)
1. outward leakage combination sealing design in spiral swing hydranlic pressure jar, it is characterised in that：Including swing hydraulic pressure cylinder, the swing hydraulic pressure
Cylinder includes working shaft (1), bearing (ball) cover (2), cylinder barrel (3), stator blade, movable vane piece, wedge inner seal liner (6) and wedge external seal
Part (7), the stator blade is fixed in cylinder barrel (3), and the bearing (ball) cover (2) is arranged at the both sides nozzle of cylinder barrel (3)；It is described dynamic
Blade is located on working shaft (1), and the movable vane piece and working shaft (1) are an entirety, and the working shaft (1) is enclosed within bearing (ball) cover
(2) and in cylinder barrel (3), rolling bearing (8) is installed between the bearing (ball) cover (2) and working shaft (1)；
Wedge inner seal liner (6) and wedge outside seal (7) are arranged on bearing (ball) cover (2) and the working shaft shaft shoulder (16) junction,
The wedge inner seal liner (6) is sealingly mounted between bearing (ball) cover (2) and the working shaft shaft shoulder (16), the wedge outside seal
(7) contacted with wedge inner seal liner (6) on working shaft (1) axial direction away from the working shaft shaft shoulder (16), and the wedge
Outside seal (7) is sealed on working shaft (1), and O-ring one is provided between the wedge outside seal (7) and bearing (ball) cover (2)
(10) indenture (12) is offered on the face that, the wedge outside seal (7) contacts with wedge inner seal liner (6).
2. outward leakage combination sealing design in spiral swing hydranlic pressure jar as claimed in claim 1, it is characterised in that：The movable vane piece
Away from being offered on the top surface of working shaft (1) along the axially extending groove one of working shaft (1), and the movable vane piece two sides
Offer the groove two radially extended along working shaft (1), the communication groove two of the groove one；The stator blade is near working shaft
(1) offered on top surface along the axially extending groove three of working shaft (1), two sides of the stator blade are offered along work
Make the groove four that axle (1) is radially extended, the groove tee joint groove four；
It is embedded with movable vane piece butadiene acrylonitrile rubber sealing ring (5) and movable vane piece teflin ring (4) in groove one and groove two, and
Working shaft (1) in the radial direction the movable vane piece butadiene acrylonitrile rubber sealing ring (5) positioned at the interior of movable vane piece teflin ring (4)
Side, movable vane piece teflin ring (4) is contacted with cylinder barrel (3)；
Stator blade butadiene acrylonitrile rubber sealing ring and stator blade teflin ring are embedded with groove three and groove four, and in working shaft
(1) the stator blade butadiene acrylonitrile rubber sealing ring is located at the inner side of stator blade teflin ring, the stator blade in the radial direction
Piece teflin ring is contacted with working shaft (1).
3. outward leakage combination sealing design in spiral swing hydranlic pressure jar as claimed in claim 1, it is characterised in that：Wedge interior sealing
Part (6) uses polytetrafluoroethylene (PTFE), and wedge outside seal (7) is using the polytetrafluoroethylene (PTFE) containing copper powder.
4. outward leakage combination sealing design in spiral swing hydranlic pressure jar as claimed in claim 1, it is characterised in that：The axis of rolling
Hold (8) and back-up ring (9) is installed away from one end of cylinder barrel (3).
5. outward leakage combination sealing design in spiral swing hydranlic pressure jar as claimed in claim 1, it is characterised in that：The cylinder barrel
(3) O-ring two (11) is provided with the crack and between bearing (ball) cover (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710047183.6A CN106762935A (en) | 2017-01-22 | 2017-01-22 | Outward leakage combination sealing design in spiral swing hydranlic pressure jar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710047183.6A CN106762935A (en) | 2017-01-22 | 2017-01-22 | Outward leakage combination sealing design in spiral swing hydranlic pressure jar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106762935A true CN106762935A (en) | 2017-05-31 |
Family
ID=58945224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710047183.6A Pending CN106762935A (en) | 2017-01-22 | 2017-01-22 | Outward leakage combination sealing design in spiral swing hydranlic pressure jar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106762935A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120332A (en) * | 2017-06-23 | 2017-09-01 | 武汉科技大学 | A kind of oscillating oil cylinder of combined-stator |
| CN114623122A (en) * | 2022-04-07 | 2022-06-14 | 北京理工大学 | High-pressure swing hydraulic cylinder |
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|---|---|---|---|---|
| US3195421A (en) * | 1963-02-04 | 1965-07-20 | Houdaille Industries Inc | Rotary hydraulic actuator and sealing means therefor |
| US3215046A (en) * | 1964-02-13 | 1965-11-02 | Ex Cell O Corp | Hydraulic motor seal |
| US3426654A (en) * | 1967-02-06 | 1969-02-11 | Ex Cell O Corp | Shaft mounting and sealing construction for rotary actuators |
| US3528345A (en) * | 1968-02-12 | 1970-09-15 | Houdaille Industries Inc | Long travel rotary actuator/damper |
| JPS50391U (en) * | 1973-05-01 | 1975-01-06 | ||
| JPH07186681A (en) * | 1993-11-05 | 1995-07-25 | Fichtel & Sachs Ag | Turning motor |
| US5791444A (en) * | 1993-11-05 | 1998-08-11 | Fichtel & Sachs Ag | Hydraulic rotary actuator such as a rotary actuator for a motor vehicle suspension, and a method for assembling the rotary actuator |
| CN1380505A (en) * | 2001-04-09 | 2002-11-20 | 卡尔·弗罗伊登伯格公司 | Main sealing device for piston rod or piston |
| CN204386992U (en) * | 2015-01-15 | 2015-06-10 | 合肥工业大学 | A kind of double-leaf rotary actuator for active stabilizer bar |
| CN105952707A (en) * | 2016-06-30 | 2016-09-21 | 东南大学 | Integrated servo hydraulic oscillating cylinder with multiple-sealing effect |
| CN106068415A (en) * | 2014-03-06 | 2016-11-02 | Nok株式会社 | Sealing device |
-
2017
- 2017-01-22 CN CN201710047183.6A patent/CN106762935A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3195421A (en) * | 1963-02-04 | 1965-07-20 | Houdaille Industries Inc | Rotary hydraulic actuator and sealing means therefor |
| US3215046A (en) * | 1964-02-13 | 1965-11-02 | Ex Cell O Corp | Hydraulic motor seal |
| US3426654A (en) * | 1967-02-06 | 1969-02-11 | Ex Cell O Corp | Shaft mounting and sealing construction for rotary actuators |
| US3528345A (en) * | 1968-02-12 | 1970-09-15 | Houdaille Industries Inc | Long travel rotary actuator/damper |
| JPS50391U (en) * | 1973-05-01 | 1975-01-06 | ||
| JPH07186681A (en) * | 1993-11-05 | 1995-07-25 | Fichtel & Sachs Ag | Turning motor |
| US5791444A (en) * | 1993-11-05 | 1998-08-11 | Fichtel & Sachs Ag | Hydraulic rotary actuator such as a rotary actuator for a motor vehicle suspension, and a method for assembling the rotary actuator |
| CN1380505A (en) * | 2001-04-09 | 2002-11-20 | 卡尔·弗罗伊登伯格公司 | Main sealing device for piston rod or piston |
| CN106068415A (en) * | 2014-03-06 | 2016-11-02 | Nok株式会社 | Sealing device |
| CN204386992U (en) * | 2015-01-15 | 2015-06-10 | 合肥工业大学 | A kind of double-leaf rotary actuator for active stabilizer bar |
| CN105952707A (en) * | 2016-06-30 | 2016-09-21 | 东南大学 | Integrated servo hydraulic oscillating cylinder with multiple-sealing effect |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120332A (en) * | 2017-06-23 | 2017-09-01 | 武汉科技大学 | A kind of oscillating oil cylinder of combined-stator |
| CN114623122A (en) * | 2022-04-07 | 2022-06-14 | 北京理工大学 | High-pressure swing hydraulic cylinder |
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| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170531 |
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| RJ01 | Rejection of invention patent application after publication |