CN110042880A - A kind of buffering response type excavation cleaner handgrip switching hydraulic system - Google Patents
A kind of buffering response type excavation cleaner handgrip switching hydraulic system Download PDFInfo
- Publication number
- CN110042880A CN110042880A CN201910331233.2A CN201910331233A CN110042880A CN 110042880 A CN110042880 A CN 110042880A CN 201910331233 A CN201910331233 A CN 201910331233A CN 110042880 A CN110042880 A CN 110042880A
- Authority
- CN
- China
- Prior art keywords
- valve
- oil
- flowline
- hydraulic
- pipe
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/8606—Control during or prevention of abnormal conditions the abnormal condition being a shock
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/895—Manual override
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention discloses a kind of buffering response type excavation cleaner handgrip switching hydraulic system, switching valve is selected including pilot control valve, the first hydraulic response system, the second hydraulic response system and oil return, first hydraulic response system includes the first check valve, the first constant current valve module and main valve plug control terminal, the first check valve and the first constant current valve module are connected by the first control valve flowline on pilot control valve, first check valve and the first permanent flow valve modules in parallel, the first constant current valve module are connected by the first permanent flow valve flowline with main valve plug control terminal；Second hydraulic response system includes second one-way valve and the second constant current valve module, second one-way valve and the second constant current valve module are connected by the second control valve flowline on pilot control valve, the second constant current valve module is connected by the second permanent flow valve flowline with main valve plug control terminal；Oil return is connected between first hydraulic response system and the second hydraulic response system selects switching valve.The system responsiveness that the handle switches in hydraulic system is good, and stability is high.
Description
Technical field
The present invention relates to excavator technical fields, and in particular to a kind of buffering response type excavation cleaner handgrip switching hydraulic pressure system
System.
Background technique
In the work cycle of hydraulic crawler excavator, response performance and impact property to hydraulic system have higher requirement,
But improving response performance certainly will cause system shock performance to decline, so need to increase guide's trimmer valve in hydraulic system, to
The responsiveness and impact property for adjusting hydraulic system, meet the needs of client.
Used guide's trimmer valve technical principle is as shown in Fig. 1 in Figure of description, when excavator pilot control valve actuation
When making, when corresponding pilot pressure enters a mouth of Fig. 1, valve 2 moves to left position, so that pilot pressure oil rapidly enters a1 mouthfuls, into
Enter main valve plug control port.
Simultaneously because its spring of the motion compresses of valve 2, sets so that valve 1 moves to left position, b1 mouthfuls of guide oil is flowed by valve 1
Oil return box plays the role of quick start.As pilot control valve Hui Zhongwei, a mouthfuls of pressure reductions, valve 2 is under the effect of its spring
Right position is moved to, internal throttle works, reduces a1 mouthfuls of pressure slowly, restore main valve plug slowly into
Position, to reduce the response performance of main valve plug, reduces the impact of hydraulic system.
The hydraulic system of the prior art there are problems that at two when in use: first is that when the switching of handle fast reciprocating, a1 mouthfuls
There are no when complete pressure release, the pilot pressure of b mouthfuls of entrance can not quickly push valve 1 to move to right position, i.e. a1 mouthfuls of pressure can not
Quick relief, when handle being caused to be switched fast, excavator action response is too slow, is unable to satisfy the demand of user.
Second is that the throttle in valve 2 and valve 3 is fixed long hole damping, damping is affected by oil liquid temperature,
I.e. after the oil liquid temperature in oil pocket herein increases, oil viscosity is reduced, and the response time will be shortened.And the oil in oil pocket herein
After liquid temperature reduces, oil viscosity is increased, and the response time will be extended；Make at different temperatures its response and impact property not
Together, customer demand can not be met well.
Summary of the invention
Cleaner handgrip is excavated the purpose of the present invention is to provide a kind of buffering response type and switches hydraulic system, which switches liquid
System responsiveness in pressure system is good, and stability is high.
To achieve the goals above, the technical solution of use is the present invention:
A kind of buffering response type excavates cleaner handgrip and switches hydraulic system, including pilot control valve, the first hydraulic response system,
Second hydraulic response system and oil return select switching valve,
First hydraulic response system includes the first check valve, the first constant current valve module and main valve plug control terminal, pilot control
The first control valve oil outlet on valve is connected with the first control valve flowline, the first control valve flowline and the first constant current valve module
Oil inlet end is connected, and the oil outlet of the first constant current valve module is connected by the first permanent flow valve flowline with main valve plug control terminal；
The oil inlet end of first check valve is connected by the first check valve oil inlet pipe with the first control valve flowline, and first is unidirectional
The oil outlet of valve is connected by the first check valve flowline with the first permanent flow valve flowline；
Second hydraulic response system includes second one-way valve and the second constant current valve module, the second control on pilot control valve
Valve oil outlet is connected with the second control valve flowline, and the second control valve flowline is connected with the oil inlet end of the second constant current valve module, the
The oil outlet of two constant current valve modules is connected by the second permanent flow valve flowline with main valve plug control terminal；
The oil inlet end of second one-way valve is connected by second one-way valve oil inlet pipe with the second control valve flowline, and second is unidirectional
The oil outlet of valve is connected by second one-way valve flowline with the second permanent flow valve flowline；
The left oil port of oil return selection switching valve is connected by the first left cut pipe of changing oil with the first control valve flowline, and oil return is selected
The first upper hydraulic fluid port for selecting switching valve passes through switching oil pipe on first and is connected with the first permanent flow valve flowline；
The right oil port of oil return selection switching valve is connected by the first right cut pipe of changing oil with the second control valve flowline, and oil return is selected
The second upper hydraulic fluid port for selecting switching valve passes through switching oil pipe on second and is connected with the second permanent flow valve flowline；
The lower hydraulic fluid port of oil return selection switching valve is connected with the first incision and changes oil pipe, and the first incision is changed oil the oil outlet connection of pipe
Fuel tank.
Preferably, excavation cleaner handgrip switching hydraulic system further includes hydraulic oil source and oil scavenge pump, and the of hydraulic oil source
One oil sources oil inlet connects fuel tank by oil scavenge pump, and the first oil sources oil outlet of hydraulic oil source leads to the first control valve oil inlet pipe and elder generation
The the first control valve oil inlet led on control valve is connected.
Preferably, the first constant current valve module includes the first damping oil pipe and the first oily compensator, the first damping oil pipe
Be connected with the first oily compensator by oil pipe, the first damping oil pipe is connected with the first permanent flow valve flowline, the first oil compensator and
First control valve flowline is connected.
Preferably, the second constant current valve module includes the second damping oil pipe and the second oily compensator, the second damping oil pipe
Be connected with the second oily compensator by oil pipe, the second damping oil pipe is connected with the second permanent flow valve flowline, the second oil compensator and
Second control valve flowline is connected.
Preferably, the oil return selection switching valve includes left valve portion, middle valve portion and right valve portion, left valve portion, middle valve portion and the right side
Valve portion is connected, and left oil port is located in left valve portion, and right oil port is located in right valve portion, the first upper hydraulic fluid port, the second upper hydraulic fluid port and lower oil
Mouth is located in middle valve portion.
The beneficial effects of the present invention are:
Above-mentioned buffering response type excavates in cleaner handgrip switching hydraulic system, devise completely new the first hydraulic response system and
Second hydraulic response system, and by the fit applications of oil return selection switching valve, it reduces when handle resets in hydraulic system
Impact improves responsiveness when handle gearshift.Whole responsiveness is more preferable in hydraulic system, and it is hydraulic can to solve handle switching
System response time and impact property are influenced by ambient temperature；It can solve the problem of system low-response when handle is switched fast.
And the component refined in hydraulic system is simplified, is made by the cooperation of the first hydraulic response system and the second hydraulic response system
With shift response is more preferable.
Detailed description of the invention
It, below will be to embodiment or existing in order to clearly demonstrate the embodiment of the present invention or technical solution in the prior art
Attached drawing needed in technical description is briefly described, it should be apparent that, the accompanying drawings in the following description is of the invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is the current schematic diagram for excavating cleaner handgrip switching hydraulic system.
Fig. 2 is the schematic diagram for buffering response type and excavating cleaner handgrip switching hydraulic system.
Fig. 3 is the structure catenation principle of the first hydraulic response system, the second hydraulic response system and oil return selection switching valve
Figure.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing:
Embodiment 1, in conjunction with Fig. 2 and Fig. 3, a kind of buffering response type excavation cleaner handgrip switching hydraulic system, including guide's control
Valve 1, the first hydraulic response system 2, the second hydraulic response system 3 and oil return processed select switching valve 4, pilot control valve 1 and excavation
Cleaner handgrip is connected.
First hydraulic response system 2 includes the first check valve 21, the first constant current valve module 22 and main valve plug control terminal 23, first
It leads and is connected with the first control valve flowline 11 on the first control valve oil outlet on control valve 1, the first control valve flowline 11 and
The oil inlet end of one constant current valve module 22 is connected, and the oil outlet of the first constant current valve module 22 passes through the first permanent flow valve flowline 12 and master
Spool control terminal 23 is connected.
The oil inlet end of first check valve 21 is connected by the first check valve oil inlet pipe 13 with the first control valve flowline 11,
The oil outlet of first check valve 21 is connected by the first check valve flowline 14 with the first permanent flow valve flowline 12.
Second hydraulic response system 3 include second one-way valve 31 and the second constant current valve module 32, the second of pilot control valve 1
Control valve oil outlet is connected with the second control valve flowline 15, the oil inlet of the second control valve flowline 15 and the second constant current valve module 32
End is connected, and the oil outlet of the second constant current valve module 32 is connected by the second permanent flow valve flowline 16 with main valve plug control terminal 23.
The oil inlet end of second one-way valve 31 is connected by second one-way valve oil inlet pipe 17 with the second control valve flowline 15, the
The oil outlet of two check valves 31 is connected by second one-way valve flowline 18 with the second permanent flow valve flowline 16.
The left oil port of oil return selection switching valve 4 is connected by the first left cut pipe 41 of changing oil with the first control valve flowline 11,
First upper hydraulic fluid port of oil return selection switching valve 4 passes through switching oil pipe 42 on first and is connected with the first permanent flow valve flowline 12.
The right oil port of oil return selection switching valve 4 is connected by the first right cut pipe 43 of changing oil with the second control valve flowline 15,
Second upper hydraulic fluid port of oil return selection switching valve 4 passes through switching oil pipe 44 on second and is connected with the second permanent flow valve flowline 16.
The lower hydraulic fluid port of oil return selection switching valve 4 is connected with the first incision and changes oil pipe 45, and the first incision is changed oil the fuel-displaced of pipe 45
End connection fuel tank.
Excavating cleaner handgrip switching hydraulic system further includes hydraulic oil source and oil scavenge pump, the first oil sources oil inlet of hydraulic oil source
Fuel tank, the logical first control valve oil inlet pipe 61 of the first oil sources oil outlet of hydraulic oil source and pilot control valve 1 are connected by oil scavenge pump
On the first control valve oil inlet be connected.
First constant current valve module 22 includes the first damping oil pipe 221 and the first oily compensator 222, the first damping oil pipe 221
It is connected with the first oily compensator 222 by oil pipe, the first damping oil pipe 221 is connected with the first permanent flow valve flowline 12, the first oil
Compensator 222 is connected with the first control valve flowline 11.
Second constant current valve module 32 includes the second damping oil pipe 321 and the second oily compensator 322, the second damping oil pipe 321
It is connected with the second oily compensator 322 by oil pipe, the second damping oil pipe 321 is connected with the second permanent flow valve flowline 16, the second oil
Compensator 322 is connected with the second control valve flowline 15.
It includes left valve portion, middle valve portion and right valve portion that oil return, which selects switching valve 4, and left valve portion, middle valve portion are connected with right valve portion,
Left oil port is located in left valve portion, and right oil port is located in right valve portion, and the first upper hydraulic fluid port, the second upper hydraulic fluid port and lower hydraulic fluid port are located at middle valve portion
On.
Embodiment 2, when normal use, since the first oil sources oil inlet of hydraulic oil source connects fuel tank by oil scavenge pump,
Fuel tank is hydraulic oil source fuel feeding.When pilot control valve 1 is moved on left position, the hydraulic oil in hydraulic oil source enters the first control
In valve flowline 11 processed, most of hydraulic oil in the first control valve flowline 11 passes through the first check valve oil inlet pipe 13, first
Check valve 21, second one-way valve flowline 18 and the first permanent flow valve flowline 12, enter in main valve plug control terminal 23, main valve plug
The main valve plug of control terminal 23 is connected with action launching end, plays the role of quick start.
Fraction hydraulic oil in first control valve flowline 11 enters oil return selection by the first left cut pipe 41 of changing oil
In switching valve 4, so that oil return selection switching valve 4 moves to left position and sets, the hydraulic oil in the first permanent flow valve flowline 12 is not at this time
4 off-load of switching valve can be selected to fuel tank by oil return.Hydraulic oil in second hydraulic response system 3 is returned by pilot control valve 1
It flows in fuel tank.Fraction hydraulic oil in first control valve flowline 11 slow transits through the first constant current valve module 22, passes through
One permanent flow valve flowline 12 enters in main valve plug control terminal 23.
Embodiment 3, when pilot control valve 1 is moved on middle position, pressure reduction on the first control valve oil outlet, first
Check valve 21 is closed, and oil liquid is flowed via the first constant current valve module 22 that the first damping oil pipe 221 and the first oily compensator 222 form
Return the first control valve oil outlet.
First permanent flow valve flowline 12 is slowly reduced with the oil liquid pressure at 23 connecting pin of main valve plug control terminal, so that main valve
The main valve plug of core control terminal 23 slowly at the uniform velocity restores to reduce entire liquid to middle position to reduce the response performance of main valve plug
The impact of pressure system.
Embodiment 4, when handle fast reciprocating is switched on right position, the first permanent flow valve flowline 12 and main valve plug control terminal 23
There are no complete pressure releases at connecting pin.
Second control valve oil outlet enters pilot pressure oil, and pilot pressure acts on 4 right side of oil return selection switching valve at this time,
Pilot pressure oil quickly pushes oil return selection switching valve 4 to move to right position.
The first permanent flow valve flowline 12 and the pressure oil of 23 connectivity port of main valve plug control terminal can pass sequentially through first at this time
Upper switching oil pipe 42, oil return selection switching valve 4 and the first incision are changed oil pipe 45, and rapid off-load is into fuel tank.Even if handle is fast
Speed switching, will not influence the response performance of entire hydraulic system, improve system responsiveness when handle is switched fast, and meet
The demand of user.
Embodiment 5, the first damping oil pipe 221 and the second damping oil pipe 321 use thin cutting edge damping hole, the first constant current valve group
Part 22 and the second constant current valve module 32 are temperature-independent permanent flow valve, make its response and impact at different temperatures
Performance is all the same, preferably meets customer demand.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also should belong to of the invention
Protection scope.
Claims (5)
1. a kind of buffering response type, which excavates cleaner handgrip, switches hydraulic system, which is characterized in that including pilot control valve, first hydraulic
Response system, the second hydraulic response system and oil return select switching valve,
First hydraulic response system includes the first check valve, the first constant current valve module and main valve plug control terminal, on pilot control valve
The first control valve oil outlet be connected with the first control valve flowline, the oil inlet of the first control valve flowline and the first constant current valve module
End is connected, and the oil outlet of the first constant current valve module is connected by the first permanent flow valve flowline with main valve plug control terminal；
The oil inlet end of first check valve is connected by the first check valve oil inlet pipe with the first control valve flowline, the first check valve
Oil outlet is connected by the first check valve flowline with the first permanent flow valve flowline；
Second hydraulic response system includes second one-way valve and the second constant current valve module, and the second control valve on pilot control valve goes out
Hydraulic fluid port is connected with the second control valve flowline, and the second control valve flowline is connected with the oil inlet end of the second constant current valve module, and second is permanent
The oil outlet of stream valve module is connected by the second permanent flow valve flowline with main valve plug control terminal；
The oil inlet end of second one-way valve is connected by second one-way valve oil inlet pipe with the second control valve flowline, second one-way valve
Oil outlet is connected by second one-way valve flowline with the second permanent flow valve flowline；
The left oil port of oil return selection switching valve is connected by the first left cut pipe of changing oil with the first control valve flowline, and oil return selects to cut
The first upper hydraulic fluid port for changing valve passes through switching oil pipe on first and is connected with the first permanent flow valve flowline；
The right oil port of oil return selection switching valve is connected by the first right cut pipe of changing oil with the second control valve flowline, and oil return selects to cut
The second upper hydraulic fluid port for changing valve passes through switching oil pipe on second and is connected with the second permanent flow valve flowline；
The lower hydraulic fluid port of oil return selection switching valve is connected with the first incision and changes oil pipe, and the first incision is changed oil the oil outlet connection oil of pipe
Case.
2. a kind of buffering response type according to claim 1, which excavates cleaner handgrip, switches hydraulic system, which is characterized in that described
Excavating cleaner handgrip switching hydraulic system further includes hydraulic oil source and oil scavenge pump, and the first oil sources oil inlet of hydraulic oil source passes through oil suction
Pump connection fuel tank, the first oil sources oil outlet of hydraulic oil source lead to the first control on the first control valve oil inlet pipe and pilot control valve
Valve oil inlet is connected.
3. a kind of buffering response type according to claim 1, which excavates cleaner handgrip, switches hydraulic system, which is characterized in that described
First constant current valve module includes the first damping oil pipe and the first oily compensator, and the first damping oil pipe and the first oily compensator pass through oil
Pipe is connected, and the first damping oil pipe is connected with the first permanent flow valve flowline, and the first oily compensator is connected with the first control valve flowline.
4. a kind of buffering response type according to claim 1, which excavates cleaner handgrip, switches hydraulic system, which is characterized in that described
Second constant current valve module includes the second damping oil pipe and the second oily compensator, and the second damping oil pipe and the second oily compensator pass through oil
Pipe is connected, and the second damping oil pipe is connected with the second permanent flow valve flowline, and the second oily compensator is connected with the second control valve flowline.
5. a kind of buffering response type according to claim 1, which excavates cleaner handgrip, switches hydraulic system, which is characterized in that described
It includes left valve portion, middle valve portion and right valve portion that oil return, which selects switching valve, and left valve portion, middle valve portion are connected with right valve portion, left oil port position
In in left valve portion, right oil port is located in right valve portion, and the first upper hydraulic fluid port, the second upper hydraulic fluid port and lower hydraulic fluid port are located in middle valve portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910331233.2A CN110042880A (en) | 2019-04-24 | 2019-04-24 | A kind of buffering response type excavation cleaner handgrip switching hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910331233.2A CN110042880A (en) | 2019-04-24 | 2019-04-24 | A kind of buffering response type excavation cleaner handgrip switching hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110042880A true CN110042880A (en) | 2019-07-23 |
Family
ID=67278838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910331233.2A Pending CN110042880A (en) | 2019-04-24 | 2019-04-24 | A kind of buffering response type excavation cleaner handgrip switching hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110042880A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104214154A (en) * | 2014-08-11 | 2014-12-17 | 徐州徐工液压件有限公司 | Rotating buffer valve |
| KR20150030927A (en) * | 2013-09-13 | 2015-03-23 | 현대중공업 주식회사 | Swing Control System for Construction Equipment |
| CN105035979A (en) * | 2015-08-05 | 2015-11-11 | 常德中联重科液压有限公司 | Balance valve group and hydraulic system |
| CN105805075A (en) * | 2016-05-31 | 2016-07-27 | 青岛雷沃挖掘机有限公司 | Buffering loop avoiding influence on starting response and engineering machinery |
| CN205639149U (en) * | 2016-05-31 | 2016-10-12 | 青岛雷沃挖掘机有限公司 | Do not influence buffering return circuit and engineering machine tool that start response |
| CN107246044A (en) * | 2017-06-13 | 2017-10-13 | 徐州徐工挖掘机械有限公司 | Chassis tensioner valve group, multi-buffer hydraulic expansion system and excavator |
-
2019
- 2019-04-24 CN CN201910331233.2A patent/CN110042880A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150030927A (en) * | 2013-09-13 | 2015-03-23 | 현대중공업 주식회사 | Swing Control System for Construction Equipment |
| CN104214154A (en) * | 2014-08-11 | 2014-12-17 | 徐州徐工液压件有限公司 | Rotating buffer valve |
| CN105035979A (en) * | 2015-08-05 | 2015-11-11 | 常德中联重科液压有限公司 | Balance valve group and hydraulic system |
| CN105805075A (en) * | 2016-05-31 | 2016-07-27 | 青岛雷沃挖掘机有限公司 | Buffering loop avoiding influence on starting response and engineering machinery |
| CN205639149U (en) * | 2016-05-31 | 2016-10-12 | 青岛雷沃挖掘机有限公司 | Do not influence buffering return circuit and engineering machine tool that start response |
| CN107246044A (en) * | 2017-06-13 | 2017-10-13 | 徐州徐工挖掘机械有限公司 | Chassis tensioner valve group, multi-buffer hydraulic expansion system and excavator |
Non-Patent Citations (1)
| Title |
|---|
| 陈艳: "《液压与气压传动》", 28 February 2017, 中国铁道出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204300040U (en) | Screw thread inserting type cutting type relief valve | |
| CN102587443A (en) | Multiway valve hydraulic control system of crawler excavator | |
| CN104029721B (en) | Loader hydraulic transfer | |
| CN110042880A (en) | A kind of buffering response type excavation cleaner handgrip switching hydraulic system | |
| CN106224315B (en) | Total power self-adaptation type load-sensitive multiple directional control valve | |
| CN102966132B (en) | Swing arm descending control loop of hydraulic excavator | |
| CN101149068A (en) | Electricity liquid ratio relief valve | |
| CN202100547U (en) | Multipath directional valve | |
| CN201513403U (en) | Multistage cylinder integrated control hydraulic valve group | |
| CN208634508U (en) | A kind of main top hydraulic system of jacking construction | |
| CN203784366U (en) | Flow regeneration valve of mini-excavator | |
| CN203081878U (en) | Hydraulic control system and engineering machinery | |
| CN202646208U (en) | Semi-integral load sensing multi-way valve | |
| CN104030199A (en) | Forklift hydraulic system with bypass oil way throttling speed regulation loop | |
| CN103727245A (en) | Hydraulic valve, hydraulic system and engineering machinery | |
| CN206000797U (en) | Total power self-adaptation type load-sensitive multiple directional control valve | |
| CN209586813U (en) | A kind of bull-dozer leading hydraulic system | |
| CN104674867B (en) | Hydraulic control system and hydraulic control method for action of bucket rod of excavator | |
| CN104214090B (en) | An integral structure of a gear pump and a jet flow valve | |
| CN209012162U (en) | A kind of hydraulic control system | |
| CN202612243U (en) | Traveling valve for hydraulic automatic traveling oil recharging | |
| CN102691331A (en) | Damping valve for hydraulic excavator and control method thereof | |
| CN203836337U (en) | Oil inlet valve body of load-sensitive multi-way valve of mini-excavator | |
| CN201991862U (en) | Positive-feedback large-flow plug-in type multiple directional control valve group | |
| CN204692224U (en) | A kind of interflow control valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190723 |
|
| RJ01 | Rejection of invention patent application after publication |