CN107061421B - 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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- CN107061421B CN107061421B CN201710513308.XA CN201710513308A CN107061421B CN 107061421 B CN107061421 B CN 107061421B CN 201710513308 A CN201710513308 A CN 201710513308A CN 107061421 B CN107061421 B CN 107061421B
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- hydraulic cylinder
- control valve
- oil
- executing agency
- pressure
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000006641 stabilisation Effects 0.000 title claims abstract description 21
- 238000011105 stabilization Methods 0.000 title claims abstract description 21
- 239000002828 fuel tank Substances 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims description 15
- 230000008901 benefit Effects 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 95
- 238000010586 diagram Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 206010044565 Tremor Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000010727 cylinder oil Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 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
- 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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- Engineering & Computer Science (AREA)
- 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 present invention provides the pressure-releasing type stabilization control devices in a kind of hydraulic cylinder braking process, comprising: pressure oil-source, directional control valve, unloading control valve, hydraulic cylinder, executing agency, sensing detection module and controller module；Pressure oil-source is connect with directional control valve, and directional control valve is connect with hydraulic cylinder, and unloading control valve is also connect with hydraulic cylinder；For hydraulic cylinder for driving executing agency to carry out operation, sensing detection module is used to detect the handling situations of executing agency；Controller module realizes that the first working oil chamber of hydraulic cylinder or the second working oil chamber are connected to or cut off with fuel tank by switching the working condition of unloading control valve according to the actual conditions of executing agency's operation.Technical solution provided by the invention can effectively inhibit the reversed jitter phenomenon in hydraulic cylinder braking process.Meanwhile the present invention also provides include the pressure-releasing type stabilization control device a kind of hydraulic cylinder braking process in pressure-releasing type stabilization control method.
Description
Technical field
The present invention relates to technical field of hydraulic, more particularly, in a kind of hydraulic cylinder actuators braking process
Pressure-releasing type stabilization control device and method.
Background technique
With the high speed development of national economy, mechanical equipment industry development is swift and violent, and the good ring of executing agency's runnability
Directly influence the performance and safety of mechanical equipment.Currently, a large amount of mechanical equipment all uses Driven by Hydraulic Cylinder executing agency
It works, i.e., removes the every activity for realizing executing agency using the pressure-driven hydraulic cylinder of oil liquid.
In the prior art, when the braking process of hydraulic cylinder mainly passes through position in hydraulic valve go back to, the oil back chamber of hydraulic cylinder
Oil circuit is closed, and executing agency is since inertia also will continue to move, so that the oil back chamber oil pressure of hydraulic cylinder is sharply increased and produced
Plugging power goes to realize hydraulic cylinder braking.But when the movement velocity of executing agency is braked to zero, the two of hydraulic cylinder at this time
Oil pressure difference between working oil chamber is very big, prevent executing agency is from stopping immediately, but has carried out opposite direction shake.Hydraulic
In the braking process of cylinder executing agency, this reversed jitter phenomenon can generally repeat repeatedly, to exist so as to cause executing agency
It runs unstable in braking process, has seriously affected the performance and operating efficiency of equipment, also brought to equipment operation very big
Security risk.Therefore, there is an urgent need to find a kind of technology to effectively prevent or inhibit in hydraulic cylinder actuators braking process
Reversed jitter phenomenon.
Summary of the invention
In order to solve above-mentioned technical problem present in existing hydraulic cylinder actuators braking process, the present invention provides one
Pressure-releasing type stabilization control device and method in kind hydraulic cylinder braking process, it is intended to hydraulic cylinder actuators be effectively prevent to brake
Reversed jitter phenomenon in journey.
In order to achieve the above object, present invention employs following technical solutions:
Pressure-releasing type stabilization control device and method in hydraulic cylinder braking process, comprising: pressure oil-source, directional control valve,
Unloading control valve, hydraulic cylinder, executing agency, sensing detection module and controller module, wherein the height that the pressure oil-source provides
Pressure oil is connected to the high pressure oil oil inlet of the directional control valve, and the oil liquid oil return opening and oil return line of the directional control valve connect
Logical, 2 actuator ports of the directional control valve are respectively communicated with 2 working oil chambers of the hydraulic cylinder；The release control
2 actuator ports of valve are respectively communicated with 2 working oil chambers of the hydraulic cylinder, the oil liquid unloading port of the unloading control valve with
Fuel tank connection, the unloading control valve are connected to or cut with fuel tank for the first working oil chamber of hydraulic cylinder or the second working oil chamber
It is disconnected；The hydraulic cylinder is connect with the executing agency, and the executing agency is driven to carry out every operation, the sensing detection module
For detecting the handling situations of the executing agency；The controller module and the directional control valve, unloading control valve and biography
Feel detection module connection, the controller module can be filled according to the control information of the directional control valve and the sensing detection
The job information for setting the detected executing agency, by switching the working condition of the unloading control valve, to control
The first working oil chamber or the second working oil chamber of the hydraulic cylinder are connected to or cut off with fuel tank, are finally reached and effectively inhibit hydraulic cylinder
Reversed jitter phenomenon in executing agency's braking process.
In the above-mentioned technical solutions, it is preferable that the unloading control valve be 3-position-3-way solenoid directional control valve, it is described unload it is voltage-controlled
First working oil chamber of the hydraulic cylinder is connected to by first working condition of valve processed with fuel tank, the second working oil chamber and fuel tank are cut
It is disconnected；Second working oil chamber of the hydraulic cylinder is connected to by the second working condition of the unloading control valve with fuel tank, the first work
Make oil pocket and fuel tank is cut off；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 velocity sensor, 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 movement；The directional control valve controls the hydraulic cylinder and is braked in middle position working condition.
In the above-mentioned technical solutions, it is preferable that controller module basis in the braking process of the executing agency
It is controlled when the movement velocity for the executing agency that the sensing detection module detects drops to about 0 as signal described
First working oil chamber of the hydraulic cylinder or the second working oil chamber are connected to a period of time by unloading control valve with fuel tank, 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 inhibit the reversed jitter phenomenon in hydraulic cylinder braking process.
Technical solution provided by the present invention have it is following significant the utility model has the advantages that
In the braking process of hydraulic cylinder actuators, when the executing agency will be transformed to by positive direction movement of taking advantage of a situation
When opposite direction moves, the movement velocity that the sensing detection module can be immediately detected the executing agency is had decreased to about
It is 0, and passes to the controller module in time as signal, the controller module is described in signal controls rapidly according to this
First working oil chamber of hydraulic cylinder or the second working oil chamber are connected to by unloading control valve in short-term with fuel tank, the hydraulic cylinder 2
The oil pressure of working oil chamber poor moment is reduced to close to zero, so that the executing agency is in the starting rank that will occur reversely shaking
Section just significantly loses heterodromous driving force, to effectively inhibit anti-in the hydraulic cylinder actuators braking process
To jitter phenomenon.
Detailed description of the invention
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 relationship in figure between appended drawing reference and component names are as follows:
1- pressure oil-source；
2- directional control valve, 201- high pressure oil oil inlet, the first actuator port of 202-, the second actuator port of 203-, 204-
Oil liquid oil return opening, first working condition of 21-, 22- second working condition, position working condition in 23-；
3- unloading control valve, the first actuator port of 301-, the second actuator port of 302-, 303- oil liquid unloading port, 31- first
Position working condition, 32- second working condition, position working condition in 33-；
4- hydraulic cylinder, the first working oil chamber of 41-, the second working oil chamber of 42-；
5- executing agency；
6- sensing detection module；
7- controller module.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other modes described herein 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
The control block diagram of hydraulic cylinder pressure-releasing type braking stabilization control device.
As shown in Figure 1, the pressure-releasing type stabilization control device of the hydraulic cylinder actuators of embodiment according to the present invention, packet
It includes: 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 high pressure oil that pressure oil-source 1 provides is connected to the high pressure oil oil inlet 201 of directional control valve 2, the oil of directional control valve 2
Liquid oil return opening 204 is connected to 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 are connected to the second working oil chamber 42 of hydraulic cylinder 4；Unloading control valve 3
First actuator port 301 is connected to 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 to, and the oil liquid unloading port 303 of unloading control valve 3 is connected to fuel tank, and unloading control valve 3 is
It is connected to or cuts off with fuel tank for the first working oil chamber 41 of hydraulic cylinder 4 or the second working oil chamber 42；Hydraulic cylinder 4 and executing agency
5 connections, for driving executing agency 5 to carry out every operation；Sensing detection module 6 is velocity sensor, for detecting execution machine
The movement velocity situation of structure 5；Controller module 7 is connect with directional control valve 2, unloading control valve 3 and sensing detection module 6, side
The control for brake information to executing agency 5 is passed to controller module 7 to control valve 2, 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 motion velocity information measured by sensing detection module 6, by switch unloading control valve 3 working condition, to control liquid
First working oil chamber 41 of cylinder pressure 4 or the second working oil chamber 42 are connected to or cut off with fuel tank, are finally reached and effectively inhibit execution machine
Reversed jitter phenomenon of the structure 5 in braking process.
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
When first working condition 21, the high pressure oil that pressure oil-source 1 provides 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 high pressure oil that pressure oil-source 1 provides enters liquid
The second working oil chamber 42 driving executing agency 5 of cylinder pressure 4 is moved downward；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
When first working condition 31, the first working oil chamber 41 of hydraulic cylinder 4 is connected to 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 to fuel tank, the first work
Make oil pocket 41 and fuel tank is cut off；When unloading control valve 3 is in middle position working condition 33,41 He of the first working oil chamber 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 under the state that moves right with Driven by Hydraulic Cylinder executing agency is anti-
It trembles and is described in detail for control process, but the present invention is not limited thereto, the present invention can be used for Driven by Hydraulic Cylinder execution
Mechanism carries out the release stabilization control in braking process under motion state in any direction.
When directional control valve 2 is in first working condition 21, unloading control valve 3 is in middle position working condition 33, pressure
The high pressure oil of power oil sources 1 enters hydraulic cylinder 4 by the high pressure oil oil inlet 201 and the first actuator port 202 of directional control valve 2
The first working oil chamber 41 driving executing agency 5 move right, the oil liquid of the second working oil chamber 42 of hydraulic cylinder 4 passes through direction control
The second actuator port 203 and oil liquid 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 is all respectively formed closing chamber, but executing agency 5 also will continue to move right due to inertia, the second work of hydraulic cylinder 4
The oil pressure of oil pocket 42 will will rise rapidly, and the oil pressure of the first working oil chamber 41 can be declined, so that the second of hydraulic cylinder 4 works
Oil pocket 42 forms that larger oil pressure is poor with the first working oil chamber 41, so that the active force for generating reversed (to the left) is braked, executes
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 hydraulic cylinder 4 at this time
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
Reversed (to the left) active force under the action of there is reversed (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 has decreased to about 0, and passes to controller mould as signal
Block 7, controller module 7 according to this signal be immediately controlled unloading control valve 3 therefrom position working condition 33 be switched to second work shape
32 a period of time (the present embodiment is about 0.11 second) of state, the second working oil chamber 42 of hydraulic cylinder 4 is connected to 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 (i.e. oil pressure
Also moment is reduced to close to zero) opposition caused by difference, so that reversely shaking will occur in executing agency 5
Initial phase just significantly lose heterodromous driving force, the amplitude reversely shaken is significantly suppressed；Process according to this,
As shown in Fig. 2, carrying out the control of release stabilization repeatedly (the present embodiment is 2 times), then it may make hydraulic cylinder actuators braking process
In reversed jitter phenomenon be improved significantly.
It is merely a preferred embodiment of the present invention, is not intended to restrict the invention, come for those skilled in the art
It says, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any modification, equivalent
Replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (4)
1. the pressure-releasing type stabilization control device in a kind of hydraulic cylinder braking process characterized by comprising 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 high pressure oil that the pressure oil-source (1) provides is connected to the high pressure oil oil inlet (201) of the directional control valve (2), institute
The oil liquid oil return opening (204) for stating directional control valve (2) is connected to 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 oil liquid unloading port (303) of pressure control valve (3) is connected to fuel tank, and the unloading control valve (3) is used for first work of hydraulic cylinder (4)
Make oil pocket (41) or the second working oil chamber (42) is connected to or cuts off with fuel tank；
The hydraulic cylinder (4) connect with the executing agency (5), and the executing agency (5) is driven to carry out every operation, the biography
Sense detection module (6) is used to detect the handling situations of the executing agency (5)；
The controller module (7) connect with the directional control valve (2), unloading control valve (3) and sensing detection module (6),
When the executing agency (5) will be transformed to opposite direction movement by positive direction movement of taking advantage of a situation, the sensing detection module (6) is vertical
It detects that the movement velocity of the executing agency (5) drops to about 0, and passes to the controller mould as signal
Block (7), the controller module (7) can be according to the control information and the sensing detection module of the directional control valve (2)
(6) job information controls the first work of the hydraulic cylinder (4) by switching the working condition of the unloading control valve (3)
Make oil pocket (41) or the second working oil chamber (42) is connected to or cuts off with fuel tank, effectively inhibits in hydraulic cylinder braking process to reach
Reversed jitter phenomenon；
The sensing detection module (6) is velocity sensor, for detecting the movement velocity of the executing agency (5).
2. the pressure-releasing type stabilization control device in hydraulic cylinder braking process according to claim 1, which is characterized 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 to fuel tank, the second working oil chamber (42) and fuel tank are cut off；The release control
The second working oil chamber (42) of the hydraulic cylinder (4) is connected to by the second working condition (32) of valve (3) with fuel tank, first works
Oil pocket (41) and fuel tank are cut off；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 process according to claim 1, which is characterized 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) respectively and the executing agency (5) is driven to carry out to the right and move downward；It is described
Directional control valve (2) controls the hydraulic cylinder (4) and is braked at middle position working condition (23).
4. the pressure-releasing type stabilization control method in a kind of hydraulic cylinder braking process, which is characterized in that 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 high pressure oil that the pressure oil-source (1) provides is connected to the directional control valve
(2) the oil liquid oil return opening (204) of high pressure oil oil inlet (201), the directional control valve (2) is connected to 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) connection, drives the executing agency (5) to carry out every operation, and the sensing detection module (6) is described for detecting
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 process, when the executing agency (5) will be transformed to opposite direction movement by positive direction movement 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
It is passed to the controller module (7) for signal, signal controls rapidly the unloading control valve to the controller module (7) according to this
(3) the first working oil chamber (41) of the hydraulic cylinder (4) or the second working oil chamber (42) are connected in short-term with fuel tank, it is described hydraulic
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 occur instead
Heterodromous driving force is just significantly lost to the initial phase of shake, to effectively inhibit in hydraulic cylinder braking process
Reversed 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 CN107061421A (en) | 2017-08-18 |
| CN107061421B true CN107061421B (en) | 2018-12-25 |
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ID=59613651
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| 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 |
Country Status (1)
| Country | Link |
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| CN (1) | CN107061421B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3541496B2 (en) * | 1995-04-26 | 2004-07-14 | コベルコ建機株式会社 | Hydraulic cylinder control device |
| JPH10238504A (en) * | 1997-02-26 | 1998-09-08 | Yutani Heavy Ind Ltd | Vibration control device and method for hydraulic cylinder |
| JP4578017B2 (en) * | 2001-04-26 | 2010-11-10 | 住友建機株式会社 | Hydraulic cylinder drive |
| CN102729972B (en) * | 2012-06-11 | 2014-04-30 | 南京理工大学 | Hydraulically-controlled electronic parking executing mechanism |
| CN104747535B (en) * | 2015-02-02 | 2017-02-22 | 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
Also Published As
| Publication number | Publication date |
|---|---|
| CN107061421A (en) | 2017-08-18 |
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Granted publication date: 20181225 Termination date: 20190629 |