CN109469664A - A kind of hydraulic cylinder buffer system - Google Patents
A kind of hydraulic cylinder buffer system Download PDFInfo
- Publication number
- CN109469664A CN109469664A CN201811366780.6A CN201811366780A CN109469664A CN 109469664 A CN109469664 A CN 109469664A CN 201811366780 A CN201811366780 A CN 201811366780A CN 109469664 A CN109469664 A CN 109469664A
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- Prior art keywords
- valve
- hydraulic cylinder
- directional control
- solenoid directional
- way
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Links
- 239000007853 buffer solution Substances 0.000 title claims abstract description 25
- 239000003921 oil Substances 0.000 claims description 106
- 239000002828 fuel tank Substances 0.000 claims description 19
- 239000010720 hydraulic oil Substances 0.000 claims description 3
- 239000000872 buffer Substances 0.000 abstract description 2
- 230000003139 buffering effect Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000011176 pooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035939 shock Effects 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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a kind of hydraulic cylinder buffer systems, including two-position four-way solenoid directional control valve, unidirectional valve group, two-position four-way solenoid directional control valve one end connects two pipelines, the other end is separately connected unidirectional valve group and pipeline, unidirectional valve group includes the first check valve and second one-way valve and the concatenated throttle valve of second one-way valve in parallel, first check valve flow direction is directed toward hydraulic cylinder, and second one-way valve flow direction is backwards to hydraulic cylinder.Hydraulic cylinder buffer system disclosed by the invention, improves complete machine stability and operating comfort, reduces piston and extends the service life of oil cylinder to the physical impact of oil cylinder, and structure is simple, and Hydraulic Elements type and quantity are few, and at low cost, practicability is stronger.
Description
Technical field
The present invention relates to a kind of buffer system more particularly to a kind of hydraulic cylinder buffer systems.
Background technique
Hydraulic cylinder can generate strong impact, noise even pull rod etc. in stroke terminal in quick motion process
Mechanical collision, especially in case of high pressures, this influence become apparent, the serious service life for affecting oil cylinder, because
And braking appropriate and buffering must be carried out before terminating to move, to guarantee the service life of system and oil cylinder.It is most of at present
Loading machine with all rare Cushioning Design (such as rotary ink tank) of hydraulic cylinder, only on oil cylinder stroke design there are surplus,
It being limited by the physical shock between equipment and limited block, realization avoids pull rod purpose, but because of strong physics
Impact, on the one hand affects complete machine stability and operating comfort, on the other hand, due to the reaction of physical impact, oil cylinder
A reaction force can be also born, the service life of oil cylinder is affected.
Hydraulic system in the prior art with buffering includes cushion dashpot, piston rod and inserting valve system, including overflow
The other valves and fuel tank of valve, three-position four-way valve, check valve, throttle valve and two position three-way valve and adapted, oil pump and pipeline
Deng.Chinese patent CN104613039A discloses a kind of bearing type hydraulicefficiency elevation structure hydraulic control device, for controlling servo
The lifting work of oil cylinder, including interconnected with servo-cylinder three-position four-way electromagnetic directional valve, bi-bit bi-pass electromagnetism throttling change
To valve, first throttle valve, two position, three-way electromagnetic change valve, one way sequence valve, two-position four-way solenoid directional control valve and the first overflow valve；
The downstream position of servo-cylinder is detected by the position sensor being arranged on servo-cylinder, sensor device is located at oil cylinder for a long time
It is interior, the accurate performance on the one hand influencing sensor is used for a long time, on the other hand shortens the service life of sensor, leads to hydraulic pressure system
Maintenance cost of uniting is high.Chinese patent CN103470552A discloses a kind of hydraulic system with pooling feature, including cushion dashpot,
Piston rod and inserting valve system, the piston rod are arranged in cushion dashpot, and the cushion dashpot is by oil pipe and inserts valve system
Hydraulic fluid port connects, and is equipped with reversal valve and one-way throttle valve on the control oil circuit between the cushion dashpot and inserting valve system, described
Reversal valve and one-way throttle valve are arranged in parallel.The hydraulic system with pooling feature is due to being provided with reversal valve and one-way throttle
Valve, reversal valve and one-way throttle valve can control the throughput of hydraulic oil in cushion dashpot to achieve the purpose that buffering.It is above-mentioned existing
Although buffer system in technology by throttle valve limit work into when hydraulic oil flow rate, in backhaul, when also needing one section
Between reversal valve could be driven to commutate by throttle valve, influence the working efficiency of hydraulic system.And hydraulic system structure is complicated, hydraulic
Component kind and quantity are various, oil leak risk is higher, higher cost.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of hydraulic cylinder buffer system, it is intended to it solves in existing hydraulic system,
Due to the reaction of physical impact, oil cylinder can also bear a reaction force, affect the service life of oil cylinder；Solve hydraulic pressure system
System also needs a period of time reversal valve could be driven to commutate by throttle valve, influences hydraulic system in the initial stage of oil return process
Working efficiency；Solve hydraulic system structure is complicated, Hydraulic Elements type and quantity are various, oil leak risk is higher, cost compared with
High, the problems such as complete machine stability and operating comfort are poor.
The present invention adopts the following technical solutions to achieve above-mentioned purpose:
A kind of hydraulic cylinder buffer system, including two-position four-way solenoid directional control valve, unidirectional valve group；The two-position four-way electromagnetism
Reversal valve one end connects two pipelines, and the other end is separately connected unidirectional valve group and pipeline；The unidirectional valve group includes in parallel the
One check valve and second one-way valve and the concatenated throttle valve of second one-way valve；The first check valve flow direction is directed toward hydraulic cylinder,
The second one-way valve flow direction is backwards to hydraulic cylinder.The pipeline of one pipeline and the other end of two-position four-way solenoid directional control valve one end
Relatively, another pipeline of two-position four-way solenoid directional control valve one end is opposite with the unidirectional valve group of the other end.
When no bar oil pocket oil inlet, piston rod is pushed to move right, when piston rod is not up to designated position, two-position four-way
Solenoid directional control valve is in left position work, the opposite pipeline connection in two-position four-way solenoid directional control valve both ends, unidirectional valve group and opposite
Pipeline is not connected to, and has the oil of bar oil pocket by pipeline to flow through two-position four-way solenoid directional control valve normally fuel-displaced；When piston rod is moved to
When designated position, two-position four-way solenoid directional control valve is in the work of right position, at this time the opposite pipe in two-position four-way solenoid directional control valve both ends
Road is not connected to, and unidirectional valve group and opposite pipeline connection have the oil of bar oil pocket to pass sequentially through two-position four-way solenoid directional control valve, second
Check valve, throttle valve are fuel-displaced.Wherein throttle valve plays the Extraction rate that limitation has bar oil pocket, i.e. oil return speed of the limitation without bar oil pocket
Degree reduces the effect of piston rod movement speed.The designated position of two-position four-way solenoid directional control valve commutation can be according to the row of oil cylinder
Only travel switch need to be arranged within safety travel end when needing to carry out a buffering to oil cylinder stroke end for journey setting,
When so oil cylinder stroke reaches end, throttle valve then plays the role of limiting piston rod speed.When piston rod slowed down after
Continue toward moving right, when parallel to terminal, two-position four-way solenoid directional control valve is still in right position work, and operator's control crank makes to have
Bar oil pocket oil inlet has finally entered bar oil pocket, at this time then oil liquid can pass through the first check valve, two-position four-way solenoid directional control valve
Throttle valve do not work, to not interfere with the speed of bar oil pocket oil inlet.When piston rod continues to be recycled to designated position,
Two-position four-way solenoid directional control valve is in left position work, at this time there is bar oil pocket oil inlet to be no longer pass through check valve, but directly pass through
The opposite pipeline in two-position four-way solenoid directional control valve both ends has been directly entered bar oil pocket.
Its further technical solution be further include travel switch, travel switch is connect with reversing valve signal, passes through stroke
Its commutation of switch control.Reversal valve, which is controlled, by travel switch carries out commutation work.
Its further technical solution is a kind of hydraulic system, the hydraulic cylinder buffer system including above scheme；Also wrap
Bar oil pocket is included, without bar oil pocket, distributing valve, fuel tank, pump；There is the connection of one end of bar oil pocket and distributing valve, is in series with therebetween hydraulic
Cylinder buffer system, it is opposite with the pipeline that the fuel tank of the distributing valve other end is connected to；The connection of one end of no bar oil pocket and distributing valve, with
The pump of the distributing valve other end is opposite；The pump connects fuel tank.Under working condition, the hydraulic cylinder buffer system at distributing valve both ends with
Fuel tank is formed with the fuel-displaced path of bar oil pocket by pipeline connection；Distributing valve both ends pass through pipeline connection without bar oil pocket and pump,
Form the oil return path without bar oil pocket.
Its further technical solution is that the pipeline connecting with fuel tank that pumps is equipped with safety valve.
Its further technical solution is, which is characterized in that one end of the piston rod is equipped with the contact of travel switch, row
Cheng Kaiguan is less than the stroke of piston at a distance from contact.
Working principle: being provided with travel switch in the oil cylinder piston throw of lever, when no bar oil pocket oil inlet, pushes piston rod
Move right, before the contact of piston rod reaches travel switch, solenoid directional control valve not it is electric, be under spring force
Left position work is having the pipeline that the oil of bar oil pocket passes sequentially through the pipeline of solenoid directional control valve both ends connection, distributing valve both ends are connected to just
It is often fuel-displaced to fuel tank.When piston rod continues to move to right, after contact connects travel switch, solenoid directional control valve obtains electric, works in right position,
There is the oil of bar oil pocket to pass sequentially through solenoid directional control valve, second one-way valve, throttle valve, the pipeline of distributing valve both ends connection at this time normal
It is fuel-displaced, eventually pass back to fuel tank.Wherein throttle valve, which plays limitation, bar oil pocket Extraction rate, that is, reduces the work of piston rod movement speed
With.
Similarly: when piston rod continues through slowing down toward moving right, (solenoid directional control valve is still in the right side at this time when parallel to terminal
Position), operator's control crank makes have bar oil pocket oil inlet, then oil liquid can successively pass through pump, distributing valve, the first check valve, electromagnetism
Reversal valve has finally entered bar oil pocket, and throttle valve at this time does not work, to not interfere with the speed of bar oil pocket oil inlet.
When piston rod continues to recycle, travel switch is touched again, solenoid directional control valve power loss works in left position under spring force,
At this time there is bar oil pocket oil inlet to be no longer pass through check valve, but be directly directly entered by the pipeline that solenoid directional control valve both ends are connected to
There is bar oil pocket.
The beneficial effects of the present invention are:
1. a kind of hydraulic cylinder buffer system provided by the invention improves complete machine stability and operating comfort.
2, a kind of hydraulic cylinder buffer system provided by the invention reduces piston to the physical impact of oil cylinder, extends oil cylinder
Service life.
3, a kind of hydraulic cylinder buffer system provided by the invention, system structure is simple, and Hydraulic Elements type and quantity are few
And reduce oil leak risk, cost is relatively low.
Detailed description of the invention
A kind of Fig. 1 are as follows: structural schematic diagram of hydraulic cylinder buffer system reversal valve left position work of the present invention.
A kind of Fig. 2 are as follows: structural schematic diagram of the right position work of hydraulic cylinder buffer system reversal valve of the present invention.
In figure: 1, two-position four-way solenoid directional control valve；2, unidirectional valve group；21, the first check valve；22, second one-way valve；23,
Throttle valve；3, travel switch；4, oil cylinder；41, there is bar oil pocket；42, without bar oil pocket；5, distributing valve；6, fuel tank；7, it pumps；8, safety
Valve；9, contact.
Specific embodiment
With reference to the accompanying drawing 1 to Fig. 2 and specific embodiment the present invention is described in detail.
As shown in Figure 1 and Figure 2, it is an embodiment of the invention, a kind of hydraulic pressure system with hydraulic cylinder buffering is provided
System includes bar oil pocket 41, without bar oil pocket 42, distributing valve 5, fuel tank 6, pump 7 and hydraulic cylinder buffer system；Its hydraulic cylinder is slow
Flushing system includes two-position four-way solenoid directional control valve 1, unidirectional valve group 2；1 one end of two-position four-way solenoid directional control valve connects two pipelines,
The other end is separately connected unidirectional valve group 2 and pipeline, wherein a pipeline and the other end of 1 one end of two-position four-way solenoid directional control valve
Pipeline it is opposite, the unidirectional valve group 2 of another pipeline of 1 one end of two-position four-way solenoid directional control valve and the other end is opposite；This is unidirectional
Valve group 2 includes the first check valve 21 and second one-way valve 22 and the concatenated throttle valve 23 of second one-way valve 22 in parallel；First is single
It is flowed to valve 21 and is directed toward hydraulic cylinder 4, the flow direction of second one-way valve 22 is backwards to hydraulic cylinder 4；It has bar oil pocket 41 and distributing valve 5
One end connection is in series with hydraulic cylinder buffer system, the company of fuel tank 6 of hydraulic cylinder buffer system and 5 other end of distributing valve therebetween
Logical pipeline is opposite；One end of no bar oil pocket 42 and distributing valve 5 is connected by piping connection, the pipeline and 5 other end of distributing valve pump 7
The pipeline connect is opposite；Pump 7 is also connected with fuel tank 6；And travel switch 3 is provided in the piston rod stroke of oil cylinder 4.
Under working condition, hydraulic cylinder buffer system and fuel tank 6 positioned at 5 both ends of distributing valve are formed by pipeline connection
There is the fuel-displaced path of bar oil pocket 41；5 both ends of distributing valve pass through pipeline connection without bar oil pocket 42 and pump 7, are formed without bar oil pocket 42
Oil return path.Before the contact of piston rod reaches travel switch, no 42 oil inlet of bar oil pocket pushes piston rod to move right,
Two-position four-way solenoid directional control valve 1 not it is electric, under spring force in left position work, there is the oil of bar oil pocket 41 to pass sequentially through
Pipeline, the pipeline of 5 both ends of distributing valve connection of 1 both ends of two-position four-way solenoid directional control valve connection are normal fuel-displaced to fuel tank 6.
When piston rod continues to move to right, after touching travel switch 3, two-position four-way solenoid directional control valve 1 must be electric, is in right position work
Make, there is the oil of bar oil pocket to pass sequentially through two-position four-way solenoid directional control valve 1, second one-way valve 22, throttle valve 23, distributing valve 5 at this time
The pipeline of both ends connection is fuel-displaced, eventually passes back to fuel tank 6, and throttle valve 23 plays the speed that limitation has bar oil pocket 41 fuel-displaced, that is, reduces
The effect of piston rod movement speed.
Continue when piston rod is slowed down toward moving right, when parallel to terminal, operator's control crank make to have bar oil pocket 41 into
Oil, oil liquid can finally enter bar oil successively by pump 7, distributing valve 5, the first check valve 21, two-position four-way solenoid directional control valve 1
Chamber 41, since second one-way valve 22 is in closed state when there is bar 41 oil inlet of oil pocket, throttle valve 23 does not work, thus
Do not influence the speed for having 41 oil inlet of bar oil pocket.When piston rod continues to recycle, after touching travel switch 3 again, two-position four-way electricity
1 power loss of magnetic reversal valve, under spring force in left position work, at this time there is 41 oil inlet of bar oil pocket to be no longer pass through unidirectional valve group
2, but bar oil pocket 41 has directly been directly entered by the pipeline that 1 both ends of two-position four-way solenoid directional control valve are connected to.Present embodiment
Only with the oil circuit that 1 two-position four-way solenoid directional control valve 1, the first check valve 21, second one-way valve 22, throttle valve 23 are constituted, just
The pooling feature of hydraulic cylinder 4 is played, structure is simple, and components are simple, and oil leak risk is small.
Travel switch 3 in present embodiment, can be by contact 9 of the one end of piston rod equipped with travel switch 3, row
Cheng Kaiguan 3 is less than the stroke of piston at a distance from contact 9；Or travel switch 3 is that the Distance-sensing having in rod oil cylinder 41 is arranged in
Device, and connect with 1 signal of two-position four-way solenoid directional control valve, when distance is less than setting value, two-position four-way solenoid directional control valve 1 is logical
Electricity, when being greater than the set value, two-position four-way solenoid directional control valve 1 is powered off；Or travel switch 3 is that the displacement having in rod oil cylinder 41 is arranged in
Sensor is connect, when displacement is greater than the set value for detecting the displacement of piston rod, and with 1 signal of two-position four-way solenoid directional control valve
When, two-position four-way solenoid directional control valve 1 is powered, and when being less than setting value, two-position four-way solenoid directional control valve 1 is powered off.
Another embodiment provides a kind of hydraulic pressure system with hydraulic cylinder buffering on the basis of above embodiment
System further includes the safety valve 8 pumped on the pipeline that 7 connect with fuel tank 6.
A kind of hydraulic cylinder buffer system provided by the invention and the hydraulic system with the buffer system, improve complete machine
Stability and operating comfort reduce piston to the physical impact of oil cylinder, extend the service life of oil cylinder；System structure letter
It is single, Hydraulic Elements type and quantity is few and the risk of oil leak is lower, cost is relatively low.
Claims (5)
1. a kind of hydraulic cylinder buffer system, which is characterized in that including two-position four-way solenoid directional control valve (1), unidirectional valve group (2)；
Described two-position four-way solenoid directional control valve (1) one end connects two pipelines, and the other end is separately connected unidirectional valve group (2) and pipeline；Institute
State unidirectional valve group (2) include in parallel the first check valve (21) and second one-way valve (22), it is concatenated with second one-way valve (22)
Throttle valve (23)；First check valve (21) flow direction is directed toward hydraulic cylinder, and second one-way valve (22) flow direction is backwards to hydraulic
Oil cylinder.
2. a kind of hydraulic cylinder buffer system according to claim 1, which is characterized in that further include travel switch (3), institute
It states travel switch (3) to connect with two-position four-way solenoid directional control valve (1) signal, its commutation is controlled by travel switch (3).
3. a kind of hydraulic system, which is characterized in that including hydraulic cylinder buffer system described in any one of claim 1 to 2
System；It further include having bar oil pocket (41), without bar oil pocket (42), distributing valve (5), fuel tank (6), pump (7)；There are bar oil pocket (41) containing work
Stopper rod, and connect with one end of distributing valve (5), it is in series with hydraulic cylinder buffer system, the other end and oil of distributing valve (5) therebetween
Case (6) connection；No bar oil pocket (42) connect with one end of distributing valve (5), and the other end of distributing valve (5) is connect with pump (7)；It is described
Pump (7) connection fuel tank (6).
4. a kind of hydraulic system according to claim 3, which is characterized in that the pipeline that the pump (7) connect with fuel tank (6)
It is equipped with safety valve (8).
5. a kind of hydraulic system according to claim 3, which is characterized in that one end of the piston rod is equipped with travel switch
(3) contact (9), travel switch (3) are less than the stroke of piston at a distance from contact (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811366780.6A CN109469664A (en) | 2018-11-16 | 2018-11-16 | A kind of hydraulic cylinder buffer system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811366780.6A CN109469664A (en) | 2018-11-16 | 2018-11-16 | A kind of hydraulic cylinder buffer system |
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| Publication Number | Publication Date |
|---|---|
| CN109469664A true CN109469664A (en) | 2019-03-15 |
Family
ID=65673577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811366780.6A Pending CN109469664A (en) | 2018-11-16 | 2018-11-16 | A kind of hydraulic cylinder buffer system |
Country Status (1)
| Country | Link |
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| CN (1) | CN109469664A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113586552A (en) * | 2020-04-30 | 2021-11-02 | 河南森源重工有限公司 | Hydraulic cylinder buffer control method and device |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4342167A1 (en) * | 1993-12-10 | 1995-06-14 | Bosch Gmbh Robert | Hydraulic braking system with drive slip control |
| DE19518893A1 (en) * | 1995-02-28 | 1996-08-29 | Rexroth Mannesmann Gmbh | Magnetic rail brake for railway vehicle |
| JP2002255051A (en) * | 2001-03-02 | 2002-09-11 | Kayaba Ind Co Ltd | Steering damper |
| CN2736624Y (en) * | 2004-08-25 | 2005-10-26 | 黄云平 | Locked type accumulator pattern automatic pressure maintaining hydraulic control slow closing valve actuator |
| CN204357810U (en) * | 2014-12-22 | 2015-05-27 | 湖州师范学院 | A kind of control gear of Hydraulic for lifting load lift |
| CN104832659A (en) * | 2015-03-31 | 2015-08-12 | 上海冠龙阀门机械有限公司 | Inclined plate micro-resisting water pump control valve |
| CN205475449U (en) * | 2016-02-22 | 2016-08-17 | 肖孚彪 | Full -automatic steady voltage water supply installation |
| CN205896357U (en) * | 2016-05-26 | 2017-01-18 | 上海冠龙阀门机械有限公司 | Water conservancy differential type butterfly water pump control valve |
| JP2017101791A (en) * | 2015-12-04 | 2017-06-08 | 日立建機株式会社 | Hydraulic motor control device |
| CN107013515A (en) * | 2016-01-28 | 2017-08-04 | 福建龙马环卫装备股份有限公司 | A kind of hydraulic system of dustbin hopper stroke latter end buffering |
| CN209278257U (en) * | 2018-11-16 | 2019-08-20 | 广西柳工机械股份有限公司 | A kind of hydraulic cylinder buffer system |
-
2018
- 2018-11-16 CN CN201811366780.6A patent/CN109469664A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4342167A1 (en) * | 1993-12-10 | 1995-06-14 | Bosch Gmbh Robert | Hydraulic braking system with drive slip control |
| DE19518893A1 (en) * | 1995-02-28 | 1996-08-29 | Rexroth Mannesmann Gmbh | Magnetic rail brake for railway vehicle |
| JP2002255051A (en) * | 2001-03-02 | 2002-09-11 | Kayaba Ind Co Ltd | Steering damper |
| CN2736624Y (en) * | 2004-08-25 | 2005-10-26 | 黄云平 | Locked type accumulator pattern automatic pressure maintaining hydraulic control slow closing valve actuator |
| CN204357810U (en) * | 2014-12-22 | 2015-05-27 | 湖州师范学院 | A kind of control gear of Hydraulic for lifting load lift |
| CN104832659A (en) * | 2015-03-31 | 2015-08-12 | 上海冠龙阀门机械有限公司 | Inclined plate micro-resisting water pump control valve |
| JP2017101791A (en) * | 2015-12-04 | 2017-06-08 | 日立建機株式会社 | Hydraulic motor control device |
| CN107013515A (en) * | 2016-01-28 | 2017-08-04 | 福建龙马环卫装备股份有限公司 | A kind of hydraulic system of dustbin hopper stroke latter end buffering |
| CN205475449U (en) * | 2016-02-22 | 2016-08-17 | 肖孚彪 | Full -automatic steady voltage water supply installation |
| CN205896357U (en) * | 2016-05-26 | 2017-01-18 | 上海冠龙阀门机械有限公司 | Water conservancy differential type butterfly water pump control valve |
| CN209278257U (en) * | 2018-11-16 | 2019-08-20 | 广西柳工机械股份有限公司 | A kind of hydraulic cylinder buffer system |
Non-Patent Citations (1)
| Title |
|---|
| 符林芳等: "液压与气压传动技术", vol. 2, 31 July 2016, 北京理工大学出版社, pages: 159 - 162 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113586552A (en) * | 2020-04-30 | 2021-11-02 | 河南森源重工有限公司 | Hydraulic cylinder buffer control method and device |
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