CN109973453A - Knife plate automatically controls valve group, hydraulic system and Work machine - Google Patents
Knife plate automatically controls valve group, hydraulic system and Work machine Download PDFInfo
- Publication number
- CN109973453A CN109973453A CN201910255772.2A CN201910255772A CN109973453A CN 109973453 A CN109973453 A CN 109973453A CN 201910255772 A CN201910255772 A CN 201910255772A CN 109973453 A CN109973453 A CN 109973453A
- Authority
- CN
- China
- Prior art keywords
- hydraulic fluid
- fluid port
- valve
- knife plate
- group
- 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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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
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
Abstract
The present invention relates to knife plate automatic controls, to solve the disadvantage that the pressure oil-source of existing Work machine knife plate automatic control hydraulic system is continued working in high pressure kicks state；A kind of knife plate automatic control valve group is provided, wherein reversal valve is 3 position-5 way electricity proportional reversing valve, is provided with throttle valve on the C hydraulic fluid port oil circuit of reversal valve；When reversal valve is in middle position, LS hydraulic fluid port is connected to the return port through shuttle valve, when in left position or right position, load pressure is reflected on LS hydraulic fluid port through reversal valve C hydraulic fluid port, throttle valve, shuttle valve, so that automatic pressure control oil sources off-load is energy-saving when being not involved in knife plate cylinder action, artificial handling comfort is improved simultaneously, increases the service life of Hydraulic Elements.
Description
Technical field
The present invention relates to a kind of automatic controls of knife plate, automatically control valve group hydraulic pressure system more specifically to a kind of knife plate
System and Work machine.
Background technique
It is to be incorporated to and formed on the basis of original vehicle knife plate control hydraulic system that knife plate, which automatically controls hydraulic system,
Integrate the artificial knife plate for manipulating and automatically controlling and automatically controls hydraulic system.
Existing knife plate, which automatically controls hydraulic system, to be existed when automatic control hydraulic system branch is not involved in work, automatically
The circuit LS of control system is closed, and pressure source is in high pressure armed state, working barrel is made to continue working the work in high pressure kicks
State shortens the service life of Hydraulic Elements so that the oil temperature of complete machine increases, oil consumption increases；Meanwhile it being sealed in knife plate cylinder circuit
High-voltage oil liquid is closed, when manually manipulation knife plate movement, the phenomenon that knife plate oil cylinder shake occurs, influences handling.
Summary of the invention
The technical problem to be solved by the present invention is to the pressure oil-sources for automatically controlling hydraulic system for existing knife plate to continue work
The shortcomings that making in high pressure kicks state, and a kind of knife plate is provided and automatically controls valve group and control system and Work machine, so that from
Automatic pressure control oil sources Low-pressure load discharge when dynamic control hydraulic system branch is not involved in the movement of left and right knife plate oil cylinder, energy conservation drop
Consumption, while artificial handling comfort is improved, increase the service life of Hydraulic Elements.
The present invention is to realize that the technical solution of its purpose is such that provide a kind of knife plate automatic control valve group, with P
Hydraulic fluid port, T hydraulic fluid port, LS hydraulic fluid port, two group oil cylinder hydraulic fluid ports, and including two groups of identical control oil circuits and shuttle valve, every group of control oil circuit packet
Reversal valve and balanced valve are included,
It is characterized in that the reversal valve is 3 position-5 way electricity proportional reversing valve, with A hydraulic fluid port, B hydraulic fluid port, C hydraulic fluid port, D
Hydraulic fluid port and E hydraulic fluid port；When reversal valve is in middle position, A hydraulic fluid port, B hydraulic fluid port, E hydraulic fluid port mutually end, and C hydraulic fluid port is connected with D hydraulic fluid port；When
When reversal valve is in left position, A hydraulic fluid port is connected with B hydraulic fluid port and C hydraulic fluid port simultaneously, and E hydraulic fluid port is connected with D hydraulic fluid port；When reversal valve is in the right side
When position, A hydraulic fluid port is connected with C hydraulic fluid port and E hydraulic fluid port simultaneously, and B hydraulic fluid port is connected with D hydraulic fluid port；It is arranged on the C hydraulic fluid port oil circuit of the reversal valve
There is throttle valve；
In every group of control oil circuit, the A hydraulic fluid port of reversal valve is connected to P hydraulic fluid port, B hydraulic fluid port and E hydraulic fluid port pass through and control oil circuit with group
In balanced valve be connected to a group oil cylinder hydraulic fluid port, D hydraulic fluid port is connect with T hydraulic fluid port；The C hydraulic fluid port difference of reversal valve in two groups of control oil circuits
It is connect with two oil inlet ends of the shuttle valve, the oil outlet of the shuttle valve is connect with LS hydraulic fluid port.
Further, above-mentioned knife plate automatically controls in valve group, further includes safety valve, and the safety valve is connected to the P oil
Between mouth and T hydraulic fluid port.
The present invention is to realize that the technical solution of its purpose is such that provide a kind of knife plate automatic control hydraulic system, packet
Automatic pressure control oil sources, knife plate automatic control valve group, pressure-gradient control valve, two groups of knife plate oil cylinders, hydraulic oil containers are included, the knife plate is automatic
Control valve group has P hydraulic fluid port, T hydraulic fluid port, LS hydraulic fluid port, two group oil cylinder hydraulic fluid ports and including two groups of identical control oil circuits and shuttle valve, often
Group control oil circuit includes reversal valve and balanced valve；T hydraulic fluid port is connected with hydraulic tank；
The automatic pressure control oil sources is connect with the P hydraulic fluid port of the pressure-gradient control valve, the CF hydraulic fluid port and LS hydraulic fluid port point of pressure-gradient control valve
The P hydraulic fluid port of valve group is not automatically controlled with knife plate and LS hydraulic fluid port is connect, and knife plate oil cylinder described in two groups is automatic with the knife plate respectively
Two group oil cylinder hydraulic fluid ports of control valve group are correspondingly connected with；
It is characterized in that the reversal valve is 3 position-5 way electricity proportional reversing valve, with A hydraulic fluid port, B hydraulic fluid port, C hydraulic fluid port, D
Hydraulic fluid port and E hydraulic fluid port；When reversal valve is in middle position, A hydraulic fluid port, B hydraulic fluid port, E hydraulic fluid port mutually end, and C hydraulic fluid port is connected with D hydraulic fluid port；When
When reversal valve is in left position, A hydraulic fluid port is connected with B hydraulic fluid port and C hydraulic fluid port simultaneously, and E hydraulic fluid port is connected with D hydraulic fluid port；When reversal valve is in the right side
When position, A hydraulic fluid port is connected with C hydraulic fluid port and E hydraulic fluid port simultaneously, and B hydraulic fluid port is connected with D hydraulic fluid port；It is arranged on the C hydraulic fluid port oil circuit of the reversal valve
There is throttle valve；
In every group of control oil circuit, the A hydraulic fluid port of reversal valve is connected to P hydraulic fluid port, B hydraulic fluid port and E hydraulic fluid port pass through and control oil circuit with group
In balanced valve be connected to a group oil cylinder hydraulic fluid port, D hydraulic fluid port is connect with T hydraulic fluid port；The C hydraulic fluid port difference of reversal valve in two groups of control oil circuits
It is connect with two oil inlet ends of the shuttle valve, the oil outlet of the shuttle valve is connect with LS hydraulic fluid port.
Further, above-mentioned knife plate automatically controls hydraulic system, and it further includes safety valve that the knife plate, which automatically controls valve group, institute
Safety valve is stated to be connected between the P hydraulic fluid port and T hydraulic fluid port.
The present invention is to realize that the technical solution of its purpose is such that provide a kind of Work machine, it is characterised in that is had
Knife plate above-mentioned automatically controls hydraulic system, which can be land leveller, bull-dozer, paver etc..
Compared with prior art, the present invention the invention has the advantages that
1, when automatic control hydraulic system is not involved in knife plate cylinder action, automatic pressure control oil sources off-load is energy-saving,
Artificial handling comfort is improved simultaneously, increases the service life of Hydraulic Elements.
2, when automatically controlling hydraulic system participation knife plate cylinder action, the circuit the LS closing of hydraulic system is automatically controlled, from
Dynamic control pressure oil-source reflects knife plate cylinder action pressure, does not have LS spill losses.
Detailed description of the invention
Fig. 1 is the schematic diagram that knife plate of the present invention automatically controls valve group.
Fig. 2 is the reversal valve schematic diagram in knife plate automatic control valve group of the present invention.
Fig. 3 is the schematic diagram that knife plate of the present invention automatically controls hydraulic system.
Parts title and serial number in figure:
Hydraulic oil container 1, pressure-gradient control valve 2, knife plate automatically control valve group 3, left manipulation valve 4, left balanced valve 5, left knife plate oil cylinder 6,
Right knife plate oil cylinder 7, right balanced valve 8, right manipulation valve 9, left reversal valve 31, right reversal valve 32, left balanced valve 33, right wing balanced valve
34, shuttle valve 35, safety valve 36.
Specific embodiment
Illustrate specific embodiment with reference to the accompanying drawing.
As shown in Figure 1, the knife plate in the present embodiment, which automatically controls valve group 3, has P hydraulic fluid port, T hydraulic fluid port, LS hydraulic fluid port, two groups of oil
Cylinder hydraulic fluid port.Two group oil cylinder hydraulic fluid ports are left oil cylinder port and right wing oil cylinder port respectively, and wherein left oil cylinder port is R1 respectively
Hydraulic fluid port and L1 hydraulic fluid port, right wing oil cylinder port are R2 hydraulic fluid port and L2 hydraulic fluid port respectively.
As shown in Figure 1, knife plate automatically control valve group 3 in include two groups of identical control oil circuits, shuttle valve 35 and safety valve 36,
Every group of control oil circuit includes reversal valve and balanced valve, and wherein left control oil circuit includes left reversal valve 31 and left balanced valve 33,
It includes right reversal valve 32 and right wing balanced valve 34 that right wing, which controls oil circuit,.The structure of left reversal valve 31 structure function and right reversal valve 32
Function is identical, and 33 structure function of left balanced valve is identical as the structure function of right wing balanced valve 34, and left reversal valve 31 and a left side
Balanced valve 33 connection relationship in road is identical as right reversal valve 32 in right wing control oil circuit and 34 connection relationship of right wing balanced valve.It is wherein left
Road balanced valve 33 is connect with left oil cylinder port namely R1 hydraulic fluid port and L1 hydraulic fluid port, right wing balanced valve 34 and right wing oil cylinder port namely
R2 hydraulic fluid port is connected with L2 hydraulic fluid port.
As shown in Fig. 2, left reversal valve 31 and right reversal valve 32 are 3 position-5 way electricity proportional reversing valve, with A hydraulic fluid port,
B hydraulic fluid port, C hydraulic fluid port, D hydraulic fluid port and E hydraulic fluid port；When reversal valve is in middle position, A hydraulic fluid port, B hydraulic fluid port, E hydraulic fluid port mutually end, C hydraulic fluid port with
The conducting of D hydraulic fluid port；When reversal valve is in left position, A hydraulic fluid port is connected with B hydraulic fluid port and C hydraulic fluid port simultaneously, and E hydraulic fluid port is connected with D hydraulic fluid port；When
When reversal valve is in right position, A hydraulic fluid port is connected with C hydraulic fluid port and E hydraulic fluid port simultaneously, and B hydraulic fluid port is connected with D hydraulic fluid port；The C hydraulic fluid port oil of reversal valve
Road is provided with throttle valve.
In left control oil circuit, the A hydraulic fluid port of left reversal valve 31 is connected to P hydraulic fluid port, B hydraulic fluid port and E hydraulic fluid port respectively with left
The corresponding connection of two hydraulic fluid ports of balanced valve 33, D hydraulic fluid port are connect with T hydraulic fluid port；In right wing control oil circuit, the A oil of right reversal valve 32
Mouthful with P hydraulic fluid port connection, B hydraulic fluid port and E hydraulic fluid port it is corresponding with two hydraulic fluid ports of right wing balanced valve 34 respectively be connected to, D hydraulic fluid port and T hydraulic fluid port company
It connects.
The C hydraulic fluid port of left reversal valve 31 is connect with the first oil inlet end of shuttle valve 35, C hydraulic fluid port and the shuttle valve 35 of right reversal valve 32
The connection of second oil inlet end, the oil outlet of shuttle valve 35 are connect with LS hydraulic fluid port.Safety valve 36 is connected between P hydraulic fluid port and T hydraulic fluid port.
Above-mentioned knife plate automatically controls valve group 3 and can be applied in the knife plate automatic control hydraulic system of land leveller, such as Fig. 3 institute
Show, knife plate automatically controls hydraulic system comprising knife plate automatically controls valve group 3, automatic pressure control oil sources P, pressure-gradient control valve 2, a left side
Knife plate oil cylinder 6, right knife plate oil cylinder 7, hydraulic oil container 1 etc..
Automatic pressure control oil sources P is connect with the P hydraulic fluid port of pressure-gradient control valve 2, the CF hydraulic fluid port and LS hydraulic fluid port of pressure-gradient control valve 2 respectively with knife
Plate automatically control valve group 3 P hydraulic fluid port connect with LS hydraulic fluid port, the rod chamber and rodless cavity of left knife plate oil cylinder 6 pass through respectively pipeline and
The R1 hydraulic fluid port that knife plate automatically controls valve group 3 is connected with L1 hydraulic fluid port, and the rod chamber and rodless cavity of right knife plate oil cylinder 7 pass through pipeline respectively
The R2 hydraulic fluid port of valve group 3 is automatically controlled with knife plate and L2 hydraulic fluid port is connect.Knife plate automatically controls the T hydraulic fluid port of valve group 3 and hydraulic oil container 1 connects
It connects.
Automatically controlled in hydraulic system in knife plate, left knife plate oil cylinder 6 and right knife plate oil cylinder 7 can also and manual steering system
Connection, realizes manually controlling for knife plate, as shown in figure 3, left knife plate oil cylinder 6 is connect by left balanced valve 5 with left manipulation valve 4, it is left
Manipulation valve 4 is connect with pressure oil-source P1, can realize manually controlling for left knife plate oil cylinder 6 by operating left manipulation valve 4.Right knife plate oil
Cylinder 7 is connect by right balanced valve 8 with right manipulation valve 9, and right manipulation valve 9 is connect with pressure oil-source P2, can be by operating right manipulation valve 9
Realize manually controlling for right knife plate oil cylinder.
When automatically controlling hydraulic system branch and participating in the movement of left and right knife plate oil cylinder namely knife plate automatically controls valve group 3
In left reversal valve 31 and or right reversal valve 32 when being not at middle position, the operating pressure of left knife plate oil cylinder or right knife plate oil cylinder is logical
The reversal valve and shuttle valve crossed in knife plate automatic control valve group are reflected in knife plate and automatically control on the LS hydraulic fluid port of valve group 3, through connecting tube
Road is transferred to the LS hydraulic fluid port of pressure-gradient control valve, makes pressure-gradient control valve working connection fuel feeding, namely from CF hydraulic fluid port fuel feeding, automatic pressure control oil sources pressure
Power reflects knife plate cylinder efficient pressure.
When automatically controlling hydraulic system branch and being not involved in the movement of left and right knife plate oil cylinder namely knife plate automatically controls valve group
When left reversal valve 31 and right reversal valve 32 in 3 are in middle position, the LS hydraulic fluid port of pressure-gradient control valve is through left reversal valve or right reversal valve
Middle position oil return, i.e. the LS oil circuit of pressure-gradient control valve automatically control reversal valve in valve group through knife plate and shuttle valve is connected to fuel tank, at this point, excellent
First valve bypass, automatic pressure control oil sources namely from EF hydraulic fluid port off-load are not involved in a left side so as to avoid hydraulic system is automatically controlled
Automatic pressure control oil sources high pressure is awaited orders and the drawbacks of high pressure kicks when the movement of right knife plate oil cylinder.
Claims (5)
1. a kind of knife plate automatically controls valve group, with P hydraulic fluid port, T hydraulic fluid port, LS hydraulic fluid port, two group oil cylinder hydraulic fluid ports, and including two groups of phases
With control oil circuit and shuttle valve, every group of control oil circuit includes reversal valve and balanced valve,
It is characterized in that the reversal valve is 3 position-5 way electricity proportional reversing valve, with A hydraulic fluid port, B hydraulic fluid port, C hydraulic fluid port, D hydraulic fluid port
With E hydraulic fluid port；When reversal valve is in middle position, A hydraulic fluid port, B hydraulic fluid port, E hydraulic fluid port mutually end, and C hydraulic fluid port is connected with D hydraulic fluid port；Work as commutation
When valve is in left position, A hydraulic fluid port is connected with B hydraulic fluid port and C hydraulic fluid port simultaneously, and E hydraulic fluid port is connected with D hydraulic fluid port；When reversal valve is in right position,
A hydraulic fluid port is connected with C hydraulic fluid port and E hydraulic fluid port simultaneously, and B hydraulic fluid port is connected with D hydraulic fluid port；Section is provided on the C hydraulic fluid port oil circuit of the reversal valve
Flow valve；
In every group of control oil circuit, the A hydraulic fluid port of reversal valve is connected to P hydraulic fluid port, B hydraulic fluid port and E hydraulic fluid port are passed through in group control oil circuit
Balanced valve is connected to a group oil cylinder hydraulic fluid port, D hydraulic fluid port is connect with T hydraulic fluid port；In two groups of control oil circuits the C hydraulic fluid port of reversal valve respectively with institute
The two oil inlet ends connection of shuttle valve is stated, the oil outlet of the shuttle valve is connect with LS hydraulic fluid port.
2. knife plate according to claim 1 automatically controls valve group, it is characterised in that further include safety valve, the safety valve connects
It connects between the P hydraulic fluid port and T hydraulic fluid port.
3. a kind of knife plate automatically controls hydraulic system, including automatic pressure control oil sources, knife plate automatically control valve group, pressure-gradient control valve,
Two groups of knife plate oil cylinders, hydraulic oil containers, the knife plate, which automatically controls valve group, has P hydraulic fluid port, T hydraulic fluid port, LS hydraulic fluid port, two group oil cylinder hydraulic fluid ports
And including two groups of identical control oil circuits and shuttle valve, every group of control oil circuit includes reversal valve and balanced valve；T hydraulic fluid port and hydraulic oil container
Connection；
The automatic pressure control oil sources is connect with the P hydraulic fluid port of the pressure-gradient control valve, the CF hydraulic fluid port and LS hydraulic fluid port of pressure-gradient control valve respectively with
The P hydraulic fluid port that knife plate automatically controls valve group is connected with LS hydraulic fluid port, and knife plate oil cylinder described in two groups is automatically controlled with the knife plate respectively
Two group oil cylinder hydraulic fluid ports of valve group are correspondingly connected with；
It is characterized in that the reversal valve is 3 position-5 way electricity proportional reversing valve, with A hydraulic fluid port, B hydraulic fluid port, C hydraulic fluid port, D hydraulic fluid port
With E hydraulic fluid port；When reversal valve is in middle position, A hydraulic fluid port, B hydraulic fluid port, E hydraulic fluid port mutually end, and C hydraulic fluid port is connected with D hydraulic fluid port；Work as commutation
When valve is in left position, A hydraulic fluid port is connected with B hydraulic fluid port and C hydraulic fluid port simultaneously, and E hydraulic fluid port is connected with D hydraulic fluid port；When reversal valve is in right position,
A hydraulic fluid port is connected with C hydraulic fluid port and E hydraulic fluid port simultaneously, and B hydraulic fluid port is connected with D hydraulic fluid port；Section is provided on the C hydraulic fluid port oil circuit of the reversal valve
Flow valve；
In every group of control oil circuit, the A hydraulic fluid port of reversal valve is connected to P hydraulic fluid port, B hydraulic fluid port and E hydraulic fluid port are passed through in group control oil circuit
Balanced valve is connected to a group oil cylinder hydraulic fluid port, D hydraulic fluid port is connect with T hydraulic fluid port；In two groups of control oil circuits the C hydraulic fluid port of reversal valve respectively with institute
The two oil inlet ends connection of shuttle valve is stated, the oil outlet of the shuttle valve is connect with LS hydraulic fluid port.
4. knife plate according to claim 3 automatically controls hydraulic system, it is characterised in that the knife plate automatically controls valve group
It further include safety valve, the safety valve is connected between the P hydraulic fluid port and T hydraulic fluid port.
5. a kind of Work machine, it is characterised in that have knife plate described in claim 3 or 4 to automatically control hydraulic system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910255772.2A CN109973453A (en) | 2019-04-01 | 2019-04-01 | Knife plate automatically controls valve group, hydraulic system and Work machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910255772.2A CN109973453A (en) | 2019-04-01 | 2019-04-01 | Knife plate automatically controls valve group, hydraulic system and Work machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109973453A true CN109973453A (en) | 2019-07-05 |
Family
ID=67082049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910255772.2A Withdrawn CN109973453A (en) | 2019-04-01 | 2019-04-01 | Knife plate automatically controls valve group, hydraulic system and Work machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109973453A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5533334A (en) * | 1992-04-08 | 1996-07-09 | Kabushiki Kaisha Komatsu Seisakusho | Pressurized fluid supply system |
| US5682955A (en) * | 1996-09-06 | 1997-11-04 | Caterpillar Inc. | Blade control system for an earthmoving blade |
| EP1295778A1 (en) * | 2001-09-18 | 2003-03-26 | Eaton Corporation | Steering system with ability to stop steering wheel rotation |
| US20050167129A1 (en) * | 2003-10-06 | 2005-08-04 | Kazuyuki Suzuki | Oil-pressure controlling device for earthmoving machine |
| US20070169473A1 (en) * | 2006-01-24 | 2007-07-26 | Sauer-Danfoss Inc. | Hydraulic circuit |
| CN101255879A (en) * | 2007-12-10 | 2008-09-03 | 兰州理工大学 | Steering preference type flux amplification valve |
| CN102032233A (en) * | 2011-01-08 | 2011-04-27 | 四川省宜宾普什驱动有限责任公司 | Multifunctional proportional multi-way valve |
| CN103470556A (en) * | 2013-08-30 | 2013-12-25 | 湖南三一路面机械有限公司 | Multi-way valve converging hydraulic system and land leveler |
| CN108087356A (en) * | 2017-12-13 | 2018-05-29 | 广西柳工机械股份有限公司 | Land leveller front-wheel drive control valve and hydraulic system |
| CN109356894A (en) * | 2018-10-22 | 2019-02-19 | 广西柳工机械股份有限公司 | Land leveller front-wheel drive control valve and hydraulic system |
-
2019
- 2019-04-01 CN CN201910255772.2A patent/CN109973453A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5533334A (en) * | 1992-04-08 | 1996-07-09 | Kabushiki Kaisha Komatsu Seisakusho | Pressurized fluid supply system |
| US5682955A (en) * | 1996-09-06 | 1997-11-04 | Caterpillar Inc. | Blade control system for an earthmoving blade |
| EP1295778A1 (en) * | 2001-09-18 | 2003-03-26 | Eaton Corporation | Steering system with ability to stop steering wheel rotation |
| US20050167129A1 (en) * | 2003-10-06 | 2005-08-04 | Kazuyuki Suzuki | Oil-pressure controlling device for earthmoving machine |
| US20070169473A1 (en) * | 2006-01-24 | 2007-07-26 | Sauer-Danfoss Inc. | Hydraulic circuit |
| CN101255879A (en) * | 2007-12-10 | 2008-09-03 | 兰州理工大学 | Steering preference type flux amplification valve |
| CN102032233A (en) * | 2011-01-08 | 2011-04-27 | 四川省宜宾普什驱动有限责任公司 | Multifunctional proportional multi-way valve |
| CN103470556A (en) * | 2013-08-30 | 2013-12-25 | 湖南三一路面机械有限公司 | Multi-way valve converging hydraulic system and land leveler |
| CN108087356A (en) * | 2017-12-13 | 2018-05-29 | 广西柳工机械股份有限公司 | Land leveller front-wheel drive control valve and hydraulic system |
| CN109356894A (en) * | 2018-10-22 | 2019-02-19 | 广西柳工机械股份有限公司 | Land leveller front-wheel drive control valve and hydraulic system |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190705 |
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| WW01 | Invention patent application withdrawn after publication |