CN107061421A - A kind of pressure-releasing type braking stabilization control device and method of hydraulic cylinder - Google Patents
A kind of pressure-releasing type braking stabilization control device and method of hydraulic cylinder Download PDFInfo
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- CN107061421A CN107061421A CN201710513308.XA CN201710513308A CN107061421A CN 107061421 A CN107061421 A CN 107061421A CN 201710513308 A CN201710513308 A CN 201710513308A CN 107061421 A CN107061421 A CN 107061421A
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- hydraulic cylinder
- control valve
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- oil
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides the pressure-releasing type stabilization control device in a kind of hydraulic cylinder braking procedure, including：Pressure oil-source, directional control valve, unloading control valve, hydraulic cylinder, executing agency, sensing detection module and controller module；Pressure oil-source is connected with directional control valve, and directional control valve is connected with hydraulic cylinder, and unloading control valve is also connected with hydraulic cylinder；Hydraulic cylinder is used to drive executing agency to carry out operation, and sensing detection module is used for the handling situations for detecting executing agency；Controller module, by switching the working condition of unloading control valve, realizes that the first working oil chamber or the second working oil chamber of hydraulic cylinder are connected or cut off with fuel tank according to the actual conditions of executing agency's operation.The technical scheme that the present invention is provided, can effectively suppress the reverse jitter phenomenon in hydraulic cylinder braking procedure.Meanwhile, present invention also offers the pressure-releasing type stabilization control method in a kind of hydraulic cylinder braking procedure for including the pressure-releasing type stabilization control device.
Description
Technical field
The present invention relates to technical field of hydraulic, more particularly, in a kind of hydraulic cylinder actuators braking procedure
Pressure-releasing type stabilization control device and method.
Background technology
With the high speed development of national economy, plant equipment industry development is swift and violent, and the good ring of executing agency's runnability
Directly influence the performance and safety of plant equipment.At present, substantial amounts of plant equipment all employs Driven by Hydraulic Cylinder executing agency
It is operated, i.e., goes to realize every activity of executing agency using the pressure-driven hydraulic cylinder of fluid.
In the prior art, when the braking procedure of hydraulic cylinder mainly returns middle position by hydraulic valve, the oil back chamber of hydraulic cylinder
Oil circuit is closed, and executing agency also may proceed to motion due to inertia so that the oil back chamber oil pressure of hydraulic cylinder is drastically raised and generated
Plugging power goes to realize that hydraulic cylinder is braked.But when the movement velocity of executing agency is braked to zero, now the two of hydraulic cylinder
Oil pressure difference between working oil chamber is very big so that executing agency can not stop immediately, but carry out opposite direction shake.In hydraulic pressure
In the braking procedure of cylinder executing agency, this reverse jitter phenomenon can typically repeat repeatedly, so as to cause executing agency to exist
Run unstable in braking procedure, had a strong impact on the performance and operating efficiency of equipment, also brought to equipment operation very big
Potential safety hazard.Therefore, it can effectively prevent or suppress in hydraulic cylinder actuators braking procedure in the urgent need to finding a kind of technology
Reverse jitter phenomenon.
The content of the invention
In order to solve above-mentioned technical problem present in existing hydraulic cylinder actuators braking procedure, the invention provides one
Plant the pressure-releasing type stabilization control device and method in hydraulic cylinder braking procedure, it is intended to effectively prevent hydraulic cylinder actuators from braking
Reverse jitter phenomenon in journey.
In order to achieve the above object, present invention employs following technical scheme：
Pressure-releasing type stabilization control device and method in hydraulic cylinder braking procedure, including：Pressure oil-source, directional control valve, release
Control valve, hydraulic cylinder, executing agency, sensing detection module and controller module, wherein, the hydraulic oil that the pressure oil-source is provided
The hydraulic oil oil inlet of the directional control valve is communicated to, the fluid oil return opening of the directional control valve is connected with oil return line, institute
2 working oil chambers of 2 actuator ports and the hydraulic cylinder of stating directional control valve are respectively communicated with；The 2 of the unloading control valve
2 working oil chambers of individual actuator port and the hydraulic cylinder are respectively communicated with, the fluid unloading port of the unloading control valve and fuel tank
Connection, the first working oil chamber or the second working oil chamber that the unloading control valve is used for hydraulic cylinder is connected or cut off with fuel tank；Institute
State hydraulic cylinder to be connected with the executing agency, drive the executing agency to carry out every operation, the sensing detection module is used for
Detect the handling situations of the executing agency；The controller module is examined with the directional control valve, unloading control valve and sensing
Survey module connection, control information and sensing detection device institute that the controller module can be according to the directional control valve
The job information of the executing agency detected, by switching the working condition of the unloading control valve, so as to control described
The first working oil chamber or the second working oil chamber of hydraulic cylinder are connected or cut off with fuel tank, are finally reached and are effectively suppressed hydraulic cylinder execution
Reverse jitter phenomenon in mechanism braking procedure.
In the above-mentioned technical solutions, it is preferable that the unloading control valve is 3-position-3-way solenoid directional control valve, described to unload voltage-controlled
First working condition of valve processed connects the first working oil chamber of the hydraulic cylinder with fuel tank, the second working oil chamber and fuel tank are cut
It is disconnected；The second working condition of the unloading control valve connects the second working oil chamber of the hydraulic cylinder with fuel tank, the first work
Make oil pocket to cut off with fuel tank；The middle position working condition of the unloading control valve is by the first working oil chamber of the hydraulic cylinder and second
Working oil chamber is all cut off with fuel tank.
In the above-mentioned technical solutions, it is preferable that the sensing detection device is tachogenerator, for detecting the execution
The movement velocity of mechanism.
In the above-mentioned technical solutions, it is preferable that the directional control valve is three-position four-way electromagnetic directional valve, the direction control
First working condition and second working condition of valve processed control respectively executing agency described in the Driven by Hydraulic Cylinder carry out to
Right and left is moved；The directional control valve controls the hydraulic cylinder to be braked in middle position working condition.
In the above-mentioned technical solutions, it is preferable that controller module basis in the braking procedure of the executing agency
The movement velocity for the executing agency that the sensing detection module is detected controls described as signal when dropping to about 0
The first working oil chamber or the second working oil chamber of the hydraulic cylinder are connected a period of time with fuel tank by unloading control valve so that described
The oil pressure difference of 2 working oil chambers of hydraulic cylinder is quickly decreased to close to zero, and the heterodromous driving force of executing agency is rapid
Reduce, so as to effectively prevent or suppress the reverse jitter phenomenon in hydraulic cylinder braking procedure.
Technical scheme provided by the present invention has following significantly beneficial effect：
In the braking procedure of hydraulic cylinder actuators, negative side will be transformed to when the executing agency is moved by positive direction of taking advantage of a situation
To during motion, the movement velocity that the sensing detection module can just be immediately detected the executing agency have decreased to about 0,
And passing to the controller module in time as signal, signal controls rapidly the release to the controller module according to this
Control valve connects the working oil chamber of hydraulic cylinder first or the second working oil chamber with fuel tank in short-term, described 2 work of hydraulic cylinder
The oil pressure of oil pocket poor moment is reduced to close to zero so that the executing agency will appear from the initial period reversely shaken just shortly
Heterodromous driving force is significantly lost, so as to effectively inhibit reversely trembling in the hydraulic cylinder actuators braking procedure
Dynamic phenomenon.
Brief description of the drawings
Fig. 1 is the structure diagram that hydraulic cylinder pressure-releasing type of the present invention brakes stabilization control device.
Fig. 2 is the control block diagram that hydraulic cylinder pressure-releasing type of the present invention brakes stabilization control device.
Corresponding relation in figure between reference and component names is：
1- pressure oil-sources；
2- directional control valves, 201- hydraulic oil oil inlets, the actuator ports of 202- first, the actuator ports of 203- second, 204- fluid
Oil return opening, first working condition of 21-, 22- second working conditions, 23- middle position working conditions；
3- unloading control valves, the actuator ports of 301- first, the actuator ports of 302- second, 303- fluid unloading port, first work of 31-
Make state, 32- second working conditions, 33- middle position working conditions；
4- hydraulic cylinders, the working oil chambers of 41- first, the working oil chambers of 42- second；
5- executing agencies；
6- sensing detection modules；
7- controller modules.
Embodiment
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Mode is applied the present invention is further described in detail.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented using other modes described here are different from, therefore, protection scope of the present invention is not by following public tool
The limitation of body embodiment.
Fig. 1 is the structure diagram that hydraulic cylinder pressure-releasing type of the present invention brakes stabilization control device；Fig. 2 is of the present invention
Hydraulic cylinder pressure-releasing type brakes the control block diagram of stabilization control device.
As shown in figure 1, the pressure-releasing type stabilization control device of hydraulic cylinder actuators according to an embodiment of the invention, bag
Include：Pressure oil-source 1, directional control valve 2, unloading control valve 3, hydraulic cylinder 4, executing agency 5, sensing detection module 6 and controller
Module 7；The hydraulic oil that pressure oil-source 1 is provided is connected to the hydraulic oil oil inlet 201 of directional control valve 2, the oil of directional control valve 2
Liquid oil return opening 204 is connected with oil return line, the first working oil chamber 41 of the first actuator port 202 and hydraulic cylinder 4 of directional control valve 2
Connection, the second actuator port 203 of directional control valve 2 is connected with the second working oil chamber 42 of hydraulic cylinder 4；Unloading control valve 3
First actuator port 301 is connected with the first working oil chamber 41 of hydraulic cylinder 4, the second actuator port 302 and liquid of unloading control valve 3
Second working oil chamber 42 of cylinder pressure 4 is connected, and the fluid unloading port 303 of unloading control valve 3 connects with fuel tank, and unloading control valve 3 is
The first working oil chamber 41 or the second working oil chamber 42 for hydraulic cylinder 4 are connected or cut off with fuel tank；Hydraulic cylinder 4 and executing agency
5 connections, for driving executing agency 5 to carry out every operation；Sensing detection module 6 is tachogenerator, for detecting execution machine
The movement velocity situation of structure 5；Controller module 7 is connected with directional control valve 2, unloading control valve 3 and sensing detection module 6, side
To control valve 2 the control for brake information transmission to executing agency 5 to controller module 7, sensing detection module 6 is by executing agency
5 motion velocity information passes to controller module 7, and controller module 7 can be according to the control for brake information of directional control valve 2
With the motion velocity information measured by sensing detection module 6, by switching the working condition of unloading control valve 3, so as to control liquid
First working oil chamber 41 of cylinder pressure 4 or the second working oil chamber 42 are connected or cut off with fuel tank, are finally reached and are effectively suppressed execution machine
Reverse jitter phenomenon of the structure 5 in braking procedure.
In the present embodiment, directional control valve 2 is the three-position four-way electromagnetic directional valve of O-shaped function, when directional control valve 2 exists
During first working condition 21, the hydraulic oil that pressure oil-source 1 is provided enters the first working oil chamber 41 driving execution machine of hydraulic cylinder 4
Structure 5 is moved right；When directional control valve 2 is in second working condition 22, the hydraulic oil that pressure oil-source 1 is provided enters liquid
The second working oil chamber 42 driving executing agency 5 of cylinder pressure 4 is carried out to left movement；When directional control valve 2 is in middle position working condition 23
When, the oil circuit of two working oil chambers of hydraulic cylinder 4 is closed, and executing agency 5 is braked.
In the present embodiment, unloading control valve 3 is the 3-position-3-way solenoid directional control valve of O-shaped function, when unloading control valve 3 exists
During first working condition 31, the first working oil chamber 41 of hydraulic cylinder 4 is connected with fuel tank, the second working oil chamber 42 is cut with fuel tank
It is disconnected；When unloading control valve 3 is in second working condition 32, the second working oil chamber 42 of hydraulic cylinder 4 is connected with fuel tank, the first work
Make oil pocket 41 to cut off with fuel tank；When unloading control valve 3 is in middle position working condition 33, the He of the first working oil chamber 41 of hydraulic cylinder 4
Second working oil chamber 42 is all cut off with fuel tank.
In the present embodiment, release when only being braked with Driven by Hydraulic Cylinder executing agency under the state that moves right is prevented
Tremble and be described in detail exemplified by control process, but the present invention is not limited thereto, and the present invention can be used for Driven by Hydraulic Cylinder to perform
Mechanism carries out the release stabilization control in braking procedure under motion state in any direction.
When directional control valve 2, which is in first working condition 21, unloading control valve 3, is in middle position working condition 33, pressure
The hydraulic oil of power oil sources 1 enters hydraulic cylinder 4 by the actuator port 202 of hydraulic oil oil inlet 201 and first of directional control valve 2
The first working oil chamber 41 driving executing agency 5 move right, the fluid of the second working oil chamber 42 of hydraulic cylinder 4 is controlled by direction
The second actuator port 203 and fluid oil return opening 204 of valve 2 processed complete oil return.
When executing agency 5 is braked, directional control valve 2 is switched to middle position working condition by first working condition 21
23, the first actuator port 202 and the second actuator port 203 are all cut off, the first working oil chamber 41 of hydraulic cylinder 4 and the second work
Oil pocket 42 all forms closing chamber respectively, but executing agency 5 also may proceed to move right due to inertia, the second work of hydraulic cylinder 4
The oil pressure of oil pocket 42 will be raised rapidly, and the oil pressure of the first working oil chamber 41 can decline so that the second work of hydraulic cylinder 4
It is poor that the working oil chamber 41 of oil pocket 42 and first forms larger oil pressure, so as to produce reversely（To the left）Active force braked, perform
The movement velocity of mechanism 5 can be gradually reduced.When the movement velocity of executing agency 5 is reduced to zero, but due to now hydraulic cylinder 4
The oil pressure difference of second working oil chamber 42 and the first working oil chamber 41 is still very big, and executing agency 5 will can be produced by oil pressure difference
It is reverse（To the left）Occur in the presence of active force reverse（To the left）Movement tendency；And at this moment, the sensing detection in the present invention
The movement velocity that module 6 quickly detects executing agency 5 have decreased to about 0, and pass to controller mould as signal
Block 7, signal controls unloading control valve 3 to be switched to second work shape from middle position working condition 33 to controller module 7 immediately according to this
The a period of time of state 32（The present embodiment is about 0.11 second）, the second working oil chamber 42 of hydraulic cylinder 4 is connected into progress with fuel tank in short-term
Release, the second working oil chamber 42 of hydraulic cylinder 4 and the oil pressure of the first working oil chamber 41 poor moment are reduced to close to zero（That is oil pressure
Also moment is reduced to close to zero opposition produced by difference）, so that executing agency 5 will appear from reversely shake shortly
Initial period just significantly lose heterodromous driving force, the amplitude reversely shaken is significantly suppressed；Process according to this,
As shown in Fig. 2 it is multiple to carry out the control of release stabilization（The present embodiment is 2 times）, then may be such that hydraulic cylinder actuators braking procedure
In reverse jitter phenomenon be improved significantly.
Only the preferred embodiments of the present invention, are not intended to limit the invention, and come for those skilled in the art
Say, the present invention there can be various modifications and variations.Within the spirit and principles of the invention, it is any modification for being made, equivalent
Replace, improve etc., it should be included in the scope of the protection.
Claims (6)
1. the pressure-releasing type stabilization control device in a kind of hydraulic cylinder braking procedure, it is characterised in that including：Pressure oil-source (1), side
To control valve (2), unloading control valve (3), hydraulic cylinder (4), executing agency (5), sensing detection module (6) and controller module
(7)；
The hydraulic oil that the pressure oil-source (1) provides is communicated to the hydraulic oil oil inlet (201) of the directional control valve (2), institute
The fluid oil return opening (204) for stating directional control valve (2) is connected with oil return line, 2 actuator ports of the directional control valve (2) with
2 working oil chambers of the hydraulic cylinder (4) are respectively communicated with；
2 actuator ports of the unloading control valve (3) are respectively communicated with 2 working oil chambers of the hydraulic cylinder (4), described to unload
The fluid unloading port (303) of pressure control valve (3) connects with fuel tank, and the unloading control valve (3) is used for the first work of hydraulic cylinder (4)
Make oil pocket (41) or the second working oil chamber (42) is connected or cut off with fuel tank；
The hydraulic cylinder (4) is connected with the executing agency (5), drives the executing agency (5) to carry out every operation, the biography
Sense detection module (6) is used for the handling situations for detecting the executing agency (5)；
The controller module (7) is connected with the directional control valve (2), unloading control valve (3) and sensing detection module (6),
The controller module (7) can be according to the control information and the work of the sensing detection module (6) of the directional control valve (2)
Industry information, by switching the working condition of the unloading control valve (3), controls the first working oil chamber of the hydraulic cylinder (4)
(41) or the second working oil chamber (42) is connected or cut off with fuel tank, effectively suppress reverse in hydraulic cylinder braking procedure so as to reach
Jitter phenomenon.
2. the pressure-releasing type stabilization control device in hydraulic cylinder braking procedure according to claim 1, it is characterised in that described
Unloading control valve (3) is 3-position-3-way solenoid directional control valve, and first working condition (31) of the unloading control valve (3) will be described
The first working oil chamber (41) of hydraulic cylinder (4) is connected with fuel tank, the second working oil chamber (42) is cut off with fuel tank；The release control
The second working condition (32) of valve (3) connects the second working oil chamber (42) of the hydraulic cylinder (4) with fuel tank, the first work
Oil pocket (41) is cut off with fuel tank；The middle position working condition (33) of the unloading control valve (3) is by the first work of the hydraulic cylinder (4)
Make oil pocket (41) and the second working oil chamber (42) all to cut off with fuel tank.
3. the pressure-releasing type stabilization control device in hydraulic cylinder braking procedure according to claim 1, it is characterised in that described
Sensing detection module (6) is tachogenerator, the movement velocity for detecting the executing agency (5).
4. the pressure-releasing type stabilization control device in hydraulic cylinder braking procedure according to claim 1, it is characterised in that described
Directional control valve (2) is three-position four-way electromagnetic directional valve, first working condition (21) of the directional control valve (2) and second
Position working condition (22) controls the hydraulic cylinder (4) to drive the executing agency (5) moved to right and left respectively；It is described
Directional control valve (2) controls the hydraulic cylinder (4) to be braked at middle position working condition (23).
5. a kind of plant equipment, it is characterised in that comprising being braked just like the hydraulic cylinder any one of Claims 1-4
Pressure-releasing type stabilization control device in journey.
6. the pressure-releasing type stabilization control method in a kind of hydraulic cylinder braking procedure, it is characterised in that to contain there is pressure oil-source
(1), directional control valve (2), unloading control valve (3), hydraulic cylinder (4), executing agency (5), sensing detection module (6) and controller
The pressure-releasing type stabilization control device of module (7)；The hydraulic oil that the pressure oil-source (1) provides is communicated to the directional control valve
(2) hydraulic oil oil inlet (201), the fluid oil return opening (204) of the directional control valve (2) is connected with oil return line, the side
2 working oil chambers of 2 actuator ports and the hydraulic cylinder (4) to control valve (2) are respectively communicated with；The unloading control valve
(3) 2 working oil chambers of 2 actuator ports and the hydraulic cylinder (4) are also respectively communicated with；The hydraulic cylinder (4) is held with described
Row mechanism (5) is connected, and drives the executing agency (5) to carry out every operation, and the sensing detection module (6) is used to detect described
The handling situations of executing agency (5)；The controller module (7) and the directional control valve (2), unloading control valve (3) and biography
Feel detection module (6) connection；
The pressure-releasing type stabilization control method：
In hydraulic cylinder braking procedure, moved when the executing agency (5) will be transformed to opposite direction by positive direction motion of taking advantage of a situation
When, the movement velocity that the sensing detection module (6) is immediately detected the executing agency (5) drops to about 0, and is made
The controller module (7) is passed to for signal, signal controls rapidly the unloading control valve to the controller module (7) according to this
(3) the first working oil chamber (41) or the second working oil chamber (42) of the hydraulic cylinder (4) are connected in short-term with fuel tank, the hydraulic pressure
The oil pressure of 2 working oil chambers of cylinder (4) poor moment is reduced to close to zero so that the executing agency (5) will appear from anti-shortly
Heterodromous driving force is just significantly lost to the initial period of shake, so as to effectively inhibit in hydraulic cylinder braking procedure
Reverse jitter phenomenon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710513308.XA CN107061421B (en) | 2017-06-29 | 2017-06-29 | A kind of pressure-releasing type braking stabilization control device and method of hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710513308.XA CN107061421B (en) | 2017-06-29 | 2017-06-29 | A kind of pressure-releasing type braking stabilization control device and method of hydraulic cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107061421A true CN107061421A (en) | 2017-08-18 |
| CN107061421B CN107061421B (en) | 2018-12-25 |
Family
ID=59613651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710513308.XA Expired - Fee Related CN107061421B (en) | 2017-06-29 | 2017-06-29 | A kind of pressure-releasing type braking stabilization control device and method of hydraulic cylinder |
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| Country | Link |
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| CN (1) | CN107061421B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08296605A (en) * | 1995-04-26 | 1996-11-12 | Yutani Heavy Ind Ltd | Hydraulic cylinder control method |
| JPH10238504A (en) * | 1997-02-26 | 1998-09-08 | Yutani Heavy Ind Ltd | Vibration control device and method for hydraulic cylinder |
| JP2002323005A (en) * | 2001-04-26 | 2002-11-08 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Hydraulic cylinder drive unit |
| CN102729972A (en) * | 2012-06-11 | 2012-10-17 | 南京理工大学 | Hydraulically-controlled electronic parking executing mechanism |
| CN104747535A (en) * | 2015-02-02 | 2015-07-01 | 三一重机有限公司 | Hydraulic buffering system and engineering machine |
| CN204628155U (en) * | 2015-05-12 | 2015-09-09 | 成都液力机械有限公司 | A kind of hydraulic cushion braking system |
-
2017
- 2017-06-29 CN CN201710513308.XA patent/CN107061421B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08296605A (en) * | 1995-04-26 | 1996-11-12 | Yutani Heavy Ind Ltd | Hydraulic cylinder control method |
| JPH10238504A (en) * | 1997-02-26 | 1998-09-08 | Yutani Heavy Ind Ltd | Vibration control device and method for hydraulic cylinder |
| JP2002323005A (en) * | 2001-04-26 | 2002-11-08 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Hydraulic cylinder drive unit |
| CN102729972A (en) * | 2012-06-11 | 2012-10-17 | 南京理工大学 | Hydraulically-controlled electronic parking executing mechanism |
| CN104747535A (en) * | 2015-02-02 | 2015-07-01 | 三一重机有限公司 | Hydraulic buffering system and engineering machine |
| CN204628155U (en) * | 2015-05-12 | 2015-09-09 | 成都液力机械有限公司 | A kind of hydraulic cushion braking system |
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| Publication number | Publication date |
|---|---|
| CN107061421B (en) | 2018-12-25 |
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