CN109469656A - Hydraulic system and engineering truck - Google Patents
Hydraulic system and engineering truck Download PDFInfo
- Publication number
- CN109469656A CN109469656A CN201811617543.2A CN201811617543A CN109469656A CN 109469656 A CN109469656 A CN 109469656A CN 201811617543 A CN201811617543 A CN 201811617543A CN 109469656 A CN109469656 A CN 109469656A
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- Prior art keywords
- hydraulic
- valve
- pump
- control
- fluid
- 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.)
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- 239000012530 fluid Substances 0.000 claims abstract description 50
- 239000013589 supplement Substances 0.000 claims abstract description 35
- 230000008676 import Effects 0.000 claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 4
- 230000001502 supplementing effect Effects 0.000 description 3
- 230000006837 decompression Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010992 reflux 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to a kind of hydraulic system and engineering truck, hydraulic system includes: the first hydraulic actuator, for driving Vehicular turn；First hydraulic pump, for providing hydraulic fluid for the first hydraulic actuator；Second hydraulic actuator, for driving workpiece to move；Second hydraulic pump, for providing hydraulic fluid for the second hydraulic actuator；First reversal valve, including the import being connected to the second hydraulic pump and the working hole being connected to the second hydraulic actuator；Supplement flow path, the outlet end including the input end being connected to the first hydraulic pump and with the inlet communication of the first reversal valve；And supplement flow circuit control valve, it is located in supplement flow path, supplement flow path is opened when being greater than predetermined pressure for the load pressure in the second hydraulic actuator or when the aperture of the first reversal valve is greater than predetermined aperture, improves the larger problem of the energy loss of hydraulic system existing in the prior art.
Description
Technical field
The present invention relates to technical field of engineering equipment, in particular to a kind of hydraulic system and engineering truck.
Background technique
In the prior art, the hydraulic system of the engineering trucks such as loading machine is mostly quantitative system, and most is hydraulic control guide
Handle control, partially to determine variable delivery hydraulic system, system is complex and higher cost.However quantitative system and determine variable system
All there is a problem of that energy loss is larger, therefore higher fuel oil is caused to be lost.
The hydraulic pilot system of loading machine, reaction is slow generally existing at low ambient temperatures, and hydraulic fluid temperature is lower, and system is rung
Should be slower, therefore, certain operating conditions of loading machine are not suitable with, the efficiency of loading machine is affected.
Summary of the invention
The present invention is intended to provide a kind of hydraulic system and engineering truck, to improve hydraulic system existing in the prior art
The larger problem of energy loss.
According to an aspect of an embodiment of the present invention, the present invention provides a kind of hydraulic system, hydraulic system includes:
First hydraulic actuator, for driving Vehicular turn；
First hydraulic pump, for providing hydraulic fluid for the first hydraulic actuator；
Second hydraulic actuator, for driving workpiece to move；
Second hydraulic pump, for providing hydraulic fluid for the second hydraulic actuator；
First reversal valve, including the import being connected to the second hydraulic pump and the work being connected to the second hydraulic actuator
Mouthful；
Supplement flow path, the outlet including the input end being connected to the first hydraulic pump and with the inlet communication of the first reversal valve
End；And
Flow circuit control valve is supplemented, is located in supplement flow path, is greater than for the load pressure in the second hydraulic actuator pre-
Supplement flow path is opened when constant-pressure or when the aperture of the first reversal valve is greater than predetermined aperture.
Optionally, supplement flow circuit control valve includes pilot operated valve device, and pilot operated valve device includes so that pilot operated valve device is switched to opening for introducing
The control mouth of the control fluid of state, control mouth are connected to the second hydraulic pump.
Optionally, hydraulic system further includes pilot valve, and pilot valve includes for changing to the first reversal valve conveying control first
To the working hole of the hydraulic fluid of the aperture and/or commutation of valve, supplementing flow circuit control valve includes that will supplement flow path control for introducing
Vavle switching processed to opening state control fluid control mouth, control mouth is connected to the working hole of pilot valve.
Optionally, pilot valve includes electromagnetic priority valve or manual pilot valve.
Optionally, further includes:
Electromagnetic priority valve, the liquid including aperture from the first reversal valve of control to the first reversal valve and/or commutation for conveying
Press the working hole of fluid；
Electric control handle is electrically connected with electromagnetic valve guide valve, to control the hydraulic fluid of the working hole output of electromagnetic priority valve
Pressure；
Controller is electrically connected with electric control handle, control supplement when the electric current for exporting in electric control handle is greater than predetermined value
Flow circuit control valve is opened.
Optionally, supplement flow circuit control valve includes solenoid valve, and solenoid valve is electrically connected with the controller.
Optionally, the first hydraulic pump is variable pump；And/or second hydraulic pump be constant displacement pump.
Optionally, hydraulic system further includes the second reversal valve, the second reversal valve include the import being connected to the first hydraulic pump,
The first working hole, the second fluid mouth with the first hydraulic actuator being connected to the first fluid mouth of the first hydraulic actuator
The second working hole being connected to and the diffluence pass with supplement fluid communication, diffluence pass can be connected with import.
Optionally, the first hydraulic pump includes variable pump, and the second hydraulic pump is connected to the feedback port of variable pump, so that variable pump
Variable is adjusted according to the operating pressure of the second hydraulic pump.
According to the another aspect of the application, a kind of engineering truck is additionally provided, engineering truck includes above-mentioned hydraulic system.
Optionally,
Deflecting roller is driven by the first hydraulic actuator；
Workpiece is driven by the second hydraulic actuator, and workpiece includes scraper bowl and the work for carrying scraper bowl
Arm.
Using the technical solution of the application, when the load pressure of the second hydraulic actuator is larger, the first hydraulic pump is defeated
Hydraulic fluid out can be supplemented to the second executive component, the first reversal valve aperture is larger, needed for the second hydraulic actuator
Flow it is larger when, the hydraulic fluid of the first hydraulic pump output can also be supplemented to the second executive component, therefore hydraulic system can fill
Point hydraulic fluid provided using hydraulic pump, the energy loss for improving hydraulic system existing in the prior art biggish are asked
Topic.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 shows the schematic illustration of the hydraulic system of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Fig. 1 shows the schematic illustration of the hydraulic system of the present embodiment.As shown in Figure 1, the hydraulic system of the present embodiment
Include:
First hydraulic actuator 5, for driving Vehicular turn；
First hydraulic pump 2, for providing hydraulic fluid for the first hydraulic actuator 5；
Second hydraulic actuator, for driving workpiece to move；
Second hydraulic pump 6, for providing hydraulic fluid for the second hydraulic actuator；
First reversal valve 7, including the import P being connected to the second hydraulic pump 6 and the work being connected to the second hydraulic actuator
Make mouth；
Flow path 19 is supplemented, is connected to including the input end being connected to the first hydraulic pump 2 and with the import P of the first reversal valve 7
Outlet end；And
Flow circuit control valve is supplemented, is located in supplement flow path 19, for being greater than in the load pressure of the second hydraulic actuator
Supplement flow path 19 is opened when predetermined pressure and when the aperture of the first reversal valve 7 is greater than predetermined aperture.
In the present embodiment, when the load pressure of the second hydraulic actuator is established, the first hydraulic pump 2 is exported hydraulic
Fluid can be conveyed to the second executive component, the first reversal valve 7 aperture is larger, flow needed for the second hydraulic actuator compared with
When big, the hydraulic fluid of the first hydraulic pump 2 output can also be supplemented to the second executive component, therefore hydraulic system can make full use of liquid
The hydraulic fluid that press pump provides improves the larger problem of the energy loss of hydraulic system existing in the prior art, improves liquid
Pressure system working efficiency.
First hydraulic actuator 5 includes the first hydraulic cylinder for driving Vehicular turn.Second hydraulic actuator packet
Include the second hydraulic cylinder 8 for driving the bucket motions of engineering truck and the third for driving the working arm movement of carrying scraper bowl
Hydraulic cylinder 17.
In the present embodiment, the first reversal valve 7 is multi-way valve, and multi-way valve is used to control second hydraulic cylinder 8 and third is hydraulic
Cylinder 17 moves.
Supplement flow circuit control valve is pilot operated valve device 9, and pilot operated valve device 9 includes so that pilot operated valve device 9 is switched to opening state for introducing
The control mouth of fluid is controlled, control mouth is connected to the second hydraulic pump 6.
The output pressure of the load pressure of second hydraulic actuator and the second hydraulic pump 6 is positively correlated, by the second hydraulic pump 6
Output pressure directly feed back to the control mouth of pilot operated valve device 9, to be beaten when the load pressure of the second hydraulic actuator is established
Pilot operated valve device 9 is opened, so that the first hydraulic pump is to the second hydraulic actuator delivering hydraulic fluid.
In the present embodiment, the first hydraulic pump 2 is variable pump, and the second hydraulic pump 6 is connected to the feedback port of variable pump, so as to become
Amount pump adjusts variable according to the operating pressure of the second hydraulic pump 6.When the load pressure of the second hydraulic actuator is established, accordingly
The pressure of hydraulic fluid of the second hydraulic pump 6 output also establish, the pressure for the hydraulic fluid that the second hydraulic pump 6 is output it is anti-
Variable pump is fed to so that variable pump increases discharge capacity.
Hydraulic system further includes the second reversal valve 4, and the second reversal valve 4 includes the import being connected to the first hydraulic pump 2, with the
First working hole of the first fluid mouth connection of one hydraulic actuator 5, the second fluid mouth company with the first hydraulic actuator 5
The second logical working hole and the diffluence pass EF with supplement fluid communication, diffluence pass EF can be connected with import.
What the first state and import that there is the second reversal valve 4 import to be connected with the first working hole were connected with the second working hole
Second state, the second reversal valve 4 further include for introducing the make it switch to first state first control fluid flow port and for drawing
Enter to make it to switch to the second control fluid flow port of the second state.
Hydraulic system further includes diverter 3, and diverter 3 includes being connected to the first control fluid flow port of the second reversal valve 4
First working hole L and the second working hole R being connected to the second control fluid flow port of the second reversal valve 4.
Diverter 3 further includes for introducing the import P of hydraulic fluid and the refluxing opening T for being connected to fuel tank 1.
Second reversal valve 4 further includes the signal port for feeding back the load pressure of the first hydraulic actuator 5 to variable pump
LS。
Hydraulic system further includes the first shuttle valve 24, and the first shuttle valve 24 includes for introducing the first hydraulic actuator 5 of feedback
Load pressure hydraulic fluid the first import, for introduce feedback the second hydraulic actuator load pressure second into
Mouth and the outlet being connected to the feedback port of variable pump.
First import of the first shuttle valve 24 is connected to the signal port LS of the second reversal valve 4.Second import of the first shuttle valve with
The outlet of second hydraulic pump 6.
In the present embodiment, the first shuttle valve 24 is a part for supplementing flow circuit control valve.Supplementing flow circuit control valve further includes
Switch valve 23, the first working hole A being connected to the import of the second hydraulic pump 6 and the first reversal valve 7 and connect with the first hydraulic pump 2
The second logical working hole B.
Second reversal valve 4 further includes diffluence pass EF, and diffluence pass EF is connected to the second working hole B of supplement flow circuit control valve,
Diffluence pass EF is used to convey the section hydraulic fluid that the import of the second reversal valve 4 introduces to the second hydraulic actuator.
Switch valve 23 is located between the first working hole A and the second working hole B of supplement flow circuit control valve, to control the first work
Make the on-off of mouth A and the second working hole B.
Switch valve 23 further includes control fluid inlet, which is connected to the first working hole A, by the second liquid
The pressure feedback of press pump 6 is to switch valve 23, and when the output pressure of the second hydraulic pump 6 is greater than predetermined value, switch valve 23, which is opened, to be mended
Fill flow path.
Supplement flow circuit control valve further includes the first signal for introducing the load pressure of the first hydraulic actuator 5 of feedback
The mouth LS1 and second signal mouth LS2 being connected to the feedback port of variable pump.
The first signal port LS1 of flow circuit control valve and the first inlet communication of the first shuttle valve 24 are supplemented, and supplements flow path control
The signal port LS connection of the first signal port LS1 and the second reversal valve 4 of valve processed.Second import of the first shuttle valve 24 and supplement flow path
First working hole A of control valve is connected to, by the pressure feedback of the second hydraulic pump 6 to variable pump.
Hydraulic system further includes pilot valve, and pilot valve includes for conveying the first reversal valve 7 of control to the first reversal valve 7
The working hole of aperture and/or the hydraulic fluid of commutation, supplement flow circuit control valve include cutting supplement flow circuit control valve for introducing
The control mouth of the control fluid of opening state is shifted to, control mouth is connected to the working hole of pilot valve.
The pressure for the hydraulic fluid that the working hole of pilot valve is conveyed to the first reversal valve 7 and the aperture of the first reversal valve 7 are just
When the pressure of correlation, the hydraulic fluid of the working hole output of pilot valve is greater than predetermined value, the aperture of the first reversal valve 7 is also correspondingly
Greater than predetermined aperture, the output pressure of the working hole of pilot valve acts on supplement flow circuit control valve, with opening in the first reversal valve 7
The hydraulic fluid that first hydraulic pump 2 exports is supplemented to the second hydraulic actuator when spending larger.
Pilot valve can manual pilot valve 12 and electromagnetic priority valve 11.Electromagnetic priority valve 11 includes 4 electric proportional pressure-reducing valves,
The working hole of electric proportional pressure-reducing valve is connect with 1,2,3,4 mouthful respectively, and the import of 4 electric proportional pressure-reducing valves is communicated and connect with P mouthfuls,
The oil return opening of electric proportional pressure-reducing valve is communicated and is connect with T mouthfuls, current control some or multiple electric proportional pressure-reducing valves, and then is passed through
1,2,3,4 mouthfuls of control multi-way valve 7 commutations, and two valve rods can be controlled simultaneously while being commutated, realize composite move.
In some embodiments, hydraulic system includes: electromagnetic priority valve 11, including is controlled for conveying to the first reversal valve 7
Make the working hole of the aperture of the first reversal valve 7 and/or the hydraulic fluid of commutation；Electric control handle 18, with 11 electricity of electromagnetic valve guide valve
Connection, to control the pressure of the hydraulic fluid of the working hole output of electromagnetic priority valve 11；Controller is electrically connected with electric control handle 18
It connects, control supplement flow circuit control valve is opened when the electric current for exporting in electric control handle 18 is greater than predetermined value.Optionally, supplement stream
Road control valve includes solenoid valve 10, and solenoid valve 10 is electrically connected with the controller.
Hydraulic system further includes guide oil source valve 14, guide oil source valve 14 include the import P1 being connected to the first hydraulic pump 2,
The first working hole A being connected to pilot valve and the second working hole B being connected to the import P of diverter 3.
Guide oil source valve 14 further includes for being connected to import P1 and the first working hole A flow path.The flow path is equipped with decompression and overflows
Valve 20 is flowed, the second working hole B and above-mentioned flow path are connected to the downstream of decompression overflow valve 20.Hydraulic system further includes and above-mentioned stream
The accumulator 21 of road connection.Optionally, accumulator 21 and above-mentioned flow path are connected to the downstream of the second working hole B.
Guide oil source valve 14 further includes the check valve being located in above-mentioned flow path, and check valve is located at the second working hole B and storage
Between energy device 21.The outlet of check valve is connected to accumulator 21, and the import of check valve is connected to the import P1 of guide oil source valve 14.
Guide oil source valve 14 further includes the solenoid valve 22 being located on flow path, and solenoid valve 22 is located at the downstream of accumulator 21.
Hydraulic system further includes the ball valve 13 being connected between the first working hole A of guide oil source valve 14 and pilot valve.
According to the another aspect of the application, a kind of engineering truck is additionally provided, engineering truck includes above-mentioned hydraulic system.
Optionally, engineering truck is loading machine.
Engineering truck further includes the deflecting roller driven by first hydraulic cylinder 5, the scraper bowl driven by second hydraulic cylinder 8 and by
The working arm of three Driven by Hydraulic Cylinder.
The above is only exemplary embodiment of the present invention, are not intended to limit the invention, all in spirit and original of the invention
Within then, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of hydraulic system characterized by comprising
First hydraulic actuator (5), for driving Vehicular turn；
First hydraulic pump (2), for providing hydraulic fluid for first hydraulic actuator (5)；
Second hydraulic actuator (8,17), for driving workpiece to move；
Second hydraulic pump (6), for providing hydraulic fluid for second hydraulic actuator (8,17)；
First reversal valve (7) hydraulic executes member including the import (P) that is connected to second hydraulic pump (6) and with described second
The working hole of part (8,17) connection；
Supplement flow path (19), including the input end that is connected to first hydraulic pump (2) and with first reversal valve (7) into
The outlet end of mouth (P) connection；And
Supplement flow circuit control valve (9,10), be located in the supplement flow path (19), be used for second hydraulic actuator (8,
17) described in being opened when load pressure is greater than predetermined pressure or when the aperture of first reversal valve (7) is greater than predetermined aperture
It supplements flow path (19).
2. hydraulic system according to claim 1, which is characterized in that the supplement flow circuit control valve (9,10) includes hydraulic control
Valve (9), the pilot operated valve device (9) include the control for introducing the control fluid for making the pilot operated valve device (9) switch to opening state
Mouthful, the control mouth is connected to second hydraulic pump (6).
3. hydraulic system according to claim 1, which is characterized in that further include pilot valve (11,12), the pilot valve
(11,12) include the aperture and/or commutation for controlling first reversal valve (7) to first reversal valve (7) conveying
The working hole of hydraulic fluid, the supplement flow circuit control valve (9,10) include for introduce by the supplement flow circuit control valve (9,
10) control mouth of the control fluid of opening state, the working hole company of the control mouth and the pilot valve (11,12) are switched to
It is logical.
4. hydraulic system according to claim 3, which is characterized in that the pilot valve (11,12) includes electromagnetic priority valve
(11) or manual pilot valve (12).
5. hydraulic system according to claim 1, which is characterized in that further include:
Electromagnetic priority valve (11), including the aperture for controlling first reversal valve (7) to first reversal valve (7) conveying
And/or the working hole of the hydraulic fluid of commutation；
Electric control handle (18) is electrically connected, to control the work of the electromagnetic priority valve (11) with the electromagnetic valve guide valve (11)
The pressure of the hydraulic fluid of mouth output；
Controller is electrically connected with the electric control handle (18), and the electric current for exporting in the electric control handle (18) is greater than predetermined
The supplement flow circuit control valve (10) is controlled when value to open.
6. hydraulic system according to claim 5, which is characterized in that the supplement flow circuit control valve (9,10) includes electromagnetism
Valve (10), the solenoid valve (10) are electrically connected with the controller.
7. hydraulic system according to claim 1, which is characterized in that first hydraulic pump (2) is variable pump；And/or
Second hydraulic pump (6) is constant displacement pump.
8. hydraulic system according to claim 1, which is characterized in that first hydraulic pump (2) includes variable pump, described
Second hydraulic pump (6) is connected to the feedback port of the variable pump, so that work of the variable pump according to second hydraulic pump (6)
Make pressure adjustment variable.
9. a kind of engineering truck, which is characterized in that including hydraulic system described in any item of the claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811617543.2A CN109469656A (en) | 2018-12-28 | 2018-12-28 | Hydraulic system and engineering truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811617543.2A CN109469656A (en) | 2018-12-28 | 2018-12-28 | Hydraulic system and engineering truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109469656A true CN109469656A (en) | 2019-03-15 |
Family
ID=65676803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811617543.2A Pending CN109469656A (en) | 2018-12-28 | 2018-12-28 | Hydraulic system and engineering truck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109469656A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973450A (en) * | 2019-03-29 | 2019-07-05 | 徐工集团工程机械股份有限公司科技分公司 | Hydraulic system and engineering truck |
| CN110486027A (en) * | 2019-09-06 | 2019-11-22 | 盾构及掘进技术国家重点实验室 | A kind of shield machine hydraulic propelling system using Redundant Control |
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| US20140090368A1 (en) * | 2011-06-09 | 2014-04-03 | Volvo Construction Equipment Ab | Hydraulic system for construction machinery |
| CN105090154A (en) * | 2015-08-26 | 2015-11-25 | 徐工集团工程机械股份有限公司科技分公司 | Unloading valve block, opening and closing core hydraulic system and engineering machine |
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| CN105134695A (en) * | 2015-08-26 | 2015-12-09 | 徐工集团工程机械股份有限公司科技分公司 | Electric control opening and closing core hydraulic system and engineering machine |
| CN209654331U (en) * | 2018-12-28 | 2019-11-19 | 徐工集团工程机械股份有限公司科技分公司 | Hydraulic system and engineering truck |
-
2018
- 2018-12-28 CN CN201811617543.2A patent/CN109469656A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140090368A1 (en) * | 2011-06-09 | 2014-04-03 | Volvo Construction Equipment Ab | Hydraulic system for construction machinery |
| CN105090154A (en) * | 2015-08-26 | 2015-11-25 | 徐工集团工程机械股份有限公司科技分公司 | Unloading valve block, opening and closing core hydraulic system and engineering machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973450A (en) * | 2019-03-29 | 2019-07-05 | 徐工集团工程机械股份有限公司科技分公司 | Hydraulic system and engineering truck |
| CN109973450B (en) * | 2019-03-29 | 2024-05-14 | 徐工集团工程机械股份有限公司科技分公司 | Hydraulic system and engineering vehicle |
| CN110486027A (en) * | 2019-09-06 | 2019-11-22 | 盾构及掘进技术国家重点实验室 | A kind of shield machine hydraulic propelling system using Redundant Control |
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