CN106593983A - Hydraulic control device of hydraulic excavator - Google Patents
Hydraulic control device of hydraulic excavator Download PDFInfo
- Publication number
- CN106593983A CN106593983A CN201710095818.XA CN201710095818A CN106593983A CN 106593983 A CN106593983 A CN 106593983A CN 201710095818 A CN201710095818 A CN 201710095818A CN 106593983 A CN106593983 A CN 106593983A
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- Prior art keywords
- valve
- hydraulic
- main valve
- control device
- main
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention provides a hydraulic control device of a hydraulic excavator, and belongs to the technical field of excavators. The hydraulic control device of the hydraulic excavator comprises two valve blocks. Each valve block comprises a main valve and a priority valve. A main valve element is arranged inside each main valve, and a priority valve element is arranged inside each priority valve. A signal channel is arranged in each valve block, and both the two valve blocks are internally provided with series connection channels and parallel connection channels. By means of the hydraulic control device of the hydraulic excavator, the priority valves are arranged in parallel connection loops, load signals can be collected by the priority valves, feedback control over the load signals is realized so that pressure losses can be reduced, and the operability and fuel economy are improved. By means of integrated arrangement of the valve block structure, the valve block arrangement is optimized, and the structure is made more compact. The priority valves used for connecting multiway valves are integrated into main valve switching valves inside the corresponding main valves, signal channels are arranged inside valve bodies, the number of matched pipes between the hydraulic device and a main machine is effectively decreased, and the valve structure is made simpler.
Description
Technical field
The present invention relates to the technical field of excavator, is specifically related to a kind of hydraulic crawler excavator hydraulic control device.
Background technology
In modern architecture industry, excavator by high efficiency, the advantage of activity duration length is widely used, thus to dig
The control of pick machine becomes the emphasis of current research.
At present, existing control is to realize principle by banked direction control valves, and use ratio control pressure-gradient control valve enters row major action
Control, so as to lift the performance of excavator, and reduces the pressure loss using interflow in valve.But this raising excavator operability
Can control need by fixed operating mode and maturation automatically controlled program based on, therefore using limit it is larger.
Also, the banked direction control valves pressure-gradient control valve of excavator is reaching preferential effect as the critical elements for lifting excavator operability
Can be because excavator working environment affects frequently to improve operating pressure so as to cause the pressure loss excessive while fruit so that excavate
Machine operability declines, and fuel economy is bad；Secondly as excavator banked direction control valves executive component is more, and correlation is more multiple
Miscellaneous, the arrangement of multichannel valve arrangement and banked direction control valves pipe arrangement is comparatively laborious always.
The content of the invention
For the above-mentioned problems in the prior art, a kind of hydraulic crawler excavator hydraulic control device is now aimed to provide, with
The internal structure of optimization pressure-gradient control valve, realizes load signal feedback control to reduce the pressure loss, and by the way of being collaborated outside valve,
Operability and fuel economy are improved, also by by the main valve switching valve that is integrated into inside main valve of pressure-gradient control valve of connection banked direction control valves
Between, effectively reduce the pipe arrangement between hydraulic means and main frame.
Concrete technical scheme is as follows：
A kind of hydraulic crawler excavator hydraulic control device, has the feature that, including：Two valve blocks, and two valve blocks are all connected with
On hydraulic pump, each valve block includes being provided with main valve plug in main valve and pressure-gradient control valve, and main valve, is provided with pressure-gradient control valve preferential
Main valve plug and priority spool in valve element, and same valve block is arranged parallel and staggers half pitch, and valve block is internally provided with letter
Number path.
A kind of above-mentioned hydraulic crawler excavator hydraulic control device, wherein, some main valves are provided with each valve block, and it is same
Some main valves in valve block are connected by series via, and the also communication in parallel of some main valves in same valve block.
A kind of above-mentioned hydraulic crawler excavator hydraulic control device, wherein, series via and alternate path are all connected to hydraulic pressure
On pump.
A kind of above-mentioned hydraulic crawler excavator hydraulic control device, wherein, pressure-gradient control valve is arranged on alternate path.
A kind of above-mentioned hydraulic crawler excavator hydraulic control device, wherein, bridge like path and cylinder ports are provided with main valve.
A kind of above-mentioned hydraulic crawler excavator hydraulic control device, wherein, priority spool is internally provided with check valve, and unidirectionally
One end of valve is connected with outer signal path, and the other end is connected with emptying path.
A kind of above-mentioned hydraulic crawler excavator hydraulic control device, wherein, one end of priority spool is provided with variable opening, separately
One end is provided with the compensating spool of UNICOM's emptying path.
A kind of above-mentioned hydraulic crawler excavator hydraulic control device, wherein, check valve is provided with pressure-gradient control valve.
A kind of above-mentioned hydraulic crawler excavator hydraulic control device, wherein, spring is arranged with priority spool.
A kind of above-mentioned hydraulic crawler excavator hydraulic control device, wherein, the bridge being provided with pressure-gradient control valve in path and main valve
Shape communication.
The good effect of above-mentioned technical proposal is：1st, by arranging some main valves, and each main valve is provided with series connection and leads to
Road and alternate path, it is ensured that the validity of fuel feeding；The 2nd, pressure-gradient control valve is set in shunt circuit, by pressure-gradient control valve to load signal
Collection, realize load signal feedback control to reduce the pressure loss, improve operability and fuel economy；3rd, by pressure-gradient control valve collection
Into in the middle of the main valve switching valve inside main valve, the pipe arrangement between hydraulic means and main frame is effectively reduced, make the mechanism of valve more
Simply；4th, on valve block structure main valve plug and priority spool stagger half pitch arrangement, can make on side configure operation signal
Connecting portion it is structure-integrated；5th, the pressure loss is reduced by the signal feedback control of itself, it is to avoid fixed operating mode and
Ripe these basic conditions of automatically controlled program, effectively reduce using limiting scope.
Description of the drawings
Fig. 1 is a kind of hydraulic schematic diagram of hydraulic crawler excavator hydraulic control device of the present invention；
Fig. 2 is the sectional view of the pressure-gradient control valve of a preferred embodiment of the present invention；
Fig. 3 is the external structure of a preferred embodiment of the present invention；
Fig. 4 is the structure chart of the corresponding valve of part A in Fig. 1；
Fig. 5 is the structure chart of the corresponding valve of part B in Fig. 1；
Fig. 6 is the structure chart of the corresponding valve of C portion in Fig. 1；
Fig. 7 is the structure chart of the corresponding valve in D parts in Fig. 1.
In accompanying drawing：1st, the first valve block；11st, left lateral is walked to use main valve；12nd, the second swing arm main valve；13rd, revolution main valve；14、
Standby main valve；15th, the first dipper main valve；16th, the first series via；17th, the first alternate path；2nd, the second valve block；21st, right lateral
Walk to use main valve；22nd, the first swing arm main valve；23rd, scraper bowl main valve；24th, the second dipper main valve；25th, the second series via；
26th, the second alternate path；3rd, the first hydraulic pump；4th, the second hydraulic pump；5th, external signal；6th, priority spool；61st, variable valve element；
7th, choke valve；8th, main valve plug；81st, first shaft shoulder；82nd, second shaft shoulder；91st, the first series connection point path；92nd, the second series connection point is logical
Road；93rd, bridge like path；94th, the first check valve；95th, cylinder ports；10th, signal path；101st, emptying path；102nd, variable opening；
103rd, compensating spool；104th, spring；105th, the 3rd shaft shoulder；106th, oily path；107th, check valve.
Specific embodiment
In order that technological means, creation characteristic, reached purpose and effect that the present invention is realized are easy to understand, it is real below
Apply example and combine accompanying drawing 1 and be specifically addressed to the technical schemes that 7 pairs, the accompanying drawing present invention is provided, but herein below is not as the present invention's
Limit.
Fig. 1 is a kind of hydraulic schematic diagram of hydraulic crawler excavator hydraulic control device of the present invention；Fig. 4 is part A pair in Fig. 1
The structure chart of the valve answered；Fig. 5 is the structure chart of the corresponding valve of part B in Fig. 1；Fig. 6 is the structure of the corresponding valve of C portion in Fig. 1
Figure；Fig. 7 is the structure chart of the corresponding valve in D parts in Fig. 1.As shown in Fig. 1, Fig. 4, Fig. 5, Fig. 6 and Fig. 7, the present embodiment is provided
Hydraulic crawler excavator hydraulic control device include：First valve block 1, left lateral is walked and used with main valve 11, the second swing arm main valve 12, revolution
Main valve 13, standby main valve 14, the first dipper main valve 15, the first series via 16, the first alternate path 17, the second valve block 2, the right side
Walking main valve 21, the first swing arm main valve 22, scraper bowl main valve 23, the second dipper main valve 24, the second series via 25,
Two alternate paths 26, the first hydraulic pump 3, the second hydraulic pump 4, external signal 5, priority spool 6 and variable valve element 61.
Fig. 2 is the sectional view of the pressure-gradient control valve of a preferred embodiment of the present invention；Fig. 3 is the outside of a preferred embodiment of the present invention
Structure chart.As shown in Figure 1, Figure 2 and shown in Fig. 3, the hydraulic crawler excavator hydraulic control device that the present embodiment is provided also includes：Throttling
Valve 7, main valve plug 8, first shaft shoulder 81, second shaft shoulder 82, first are connected and divide path 91, second series connection point path 92, a bridge like path
93rd, the first check valve 94, cylinder ports 95, signal path 10, emptying path 101, variable opening 102, compensating spool 103, spring
104th, the 3rd shaft shoulder 105, oily path 106 and check valve 107.
Specifically, control device includes two valve blocks, and two valve blocks include the first valve block 1 and the second valve block 2, and two valve blocks connect
It is connected on two hydraulic pumps, two hydraulic pumps include the first hydraulic pump 3 and the second hydraulic pump 4.And first be provided with some masters in valve block 1
Valve, and these main valves including left lateral walk with main valve 11, the second swing arm main valve 12, revolution main valve 13, standby main valve 14 and
First dipper main valve 15, and walk except left lateral in these main valves and connected with one first series via 16 with addition to main valve 11, and
These are walked except left lateral and are also connected with one first alternate path 17 with other main valves in addition to main valve 11, and the first series via 16 and
One alternate path 17 is connected with the first hydraulic pump 3.
Specifically, some main valves are again provided with the second valve block 2, these main valves are walked with main valve 21, first including right lateral
Swing arm main valve 22, scraper bowl main valve 23 and the second dipper main valve 24, and except right lateral is walked with addition to main valve 21 in these main valves
Connect with one second series via 25, and these are walked with other main valves in addition to main valve 21 also with one second and UNICOM except right lateral
Road 26 connects, and the second series via 25 and the second alternate path 26 are connected with the second hydraulic pump 4.
Specifically, a check valve is provided between the second swing arm main valve 12 and the first alternate path 17 (such as Fig. 7 institutes
Show), it is ensured that in the case where the second swing arm main valve 12 is only operated, hydraulic oil can be from the first alternate path 17 and the first series connection
Path 16 is supplied to together in the oil-in of the second swing arm main valve 12.
Specifically, a switching valve (as shown in Figure 5) is provided between the alternate path 17 of revolution main valve 13 and first, and
This switching valve is provided with priority spool 6, and priority spool 6 and is provided with variable valve element 61 and check valve, variable valve element 61 and single
External signal 5 can be received to valve and adjust aperture, when individually operated revolution is with main valve 13, without external signal 5 on priority spool 6
Effect, now priority spool 6 is shown in a fully open operation, and has reached the purpose for carrying out fuel feeding with the minimum pressure loss.
When revolution is operated with 13 and second swing arm main valve 12 of main valve simultaneously, external signal 5 is applied to priority spool 6
On, now, the aperture area of variable valve element 61 is reduced, and is led by the second swing arm with the first series via 16 of main valve 13 to revolution
Valve 12 cuts off.Therefore, priority spool 6 can only be passed through from the first hydraulic pump 3 to the hydraulic oil of the oil-in of revolution main valve 13
Variable valve element 61 is supplying.
Specifically, control valve (as shown in Figure 6) is provided between the alternate path 17 of standby main valve 14 and first, valve is controlled
Including a check valve and a choke valve 7, when standby main valve 14 is only operated, the hydraulic oil in alternate path is by check valve and section
Stream valve 7 is fed on the oil-in of standby main valve 14.
Specifically, another switching valve is provided between the first dipper main valve 15 and the first alternate path 17 (such as Fig. 4 institutes
Show), and this switching valve is again provided with being again provided with variable valve element 61 and check valve on priority spool 6, and priority spool 6,
But can rise with the pressure in the downstream of variable valve element 61 in the variable opening 102 of variable valve element 61 and expand aperture.
When individually operated first dipper is with main valve 15, act on without external signal 5 on priority spool 6, now variable valve element
61 variable opening 102 is in maximum position, it is ensured that the first series via 16 and the first alternate path 17 are minimum in crushing
In the case of fuel feeding.
When the first dipper is operated with main valve 15 and revolution main valve 13 simultaneously, external signal 5 acts on the first dipper use
Priority spool 6 on the alternate path of main valve 15, now, the variable opening 102 of the variable valve element 61 on the priority spool 6
Aperture can be reduced, and make the hydraulic oil in the first alternate path 17 by the oil-in of supply on restriction to the first dipper main valve 15.
Now, the first series via 16 for supplying the first dipper main valve 15 is cut off by revolution main valve 13, and only aperture is restricted
First alternate path 17 causes hydraulic oil preferentially to flow to revolution main valve 13 to the first dipper fuel feeding of main valve 15, so that
The driving pressure of the first dipper is far below the driving pressure required for revolution, it is ensured that the coordination of two hydraulic actuator actions
Property.
Specifically, some valves are again provided with the second alternate path 26 in the second valve block 2, wherein, it is arranged at
Valve between one swing arm main valve 22 and the second alternate path 26 and it is arranged at the second swing arm main valve 12 and first and UNICOM
Check valve between road 17 is identical；The valve that is arranged near scraper bowl main valve 23 and to be arranged at standby main valve 14 in parallel with first
The control valve arranged between path 17 is identical；The valve that is arranged between the second dipper main valve 24 and the second alternate path 26 and
The switching valve being arranged between the first dipper main valve 15 and the first alternate path 17 is identical.As shown in Figure 1.
It is more specific, the switching valve that is arranged between the first dipper main valve 15 and the first alternate path 17 or it is arranged at
Be provided with priority spool 6 in switching valve between second dipper main valve 24 and the second alternate path 26, and priority spool 6 with
First dipper is arranged parallel with the main valve plug 8 of the dipper main valve 24 of main valve 15 or second, and between priority spool 6 and main valve plug 8
The half pitch that staggers (as shown in Figure 3), realizes integrated design, more compact structure.
More specific, first shaft shoulder 81 and second shaft shoulder 82 are provided with main valve plug 8, and be provided with main valve and
One shaft shoulder 81 and the corresponding second series connection point path 92 and first series connection point path 91 of second shaft shoulder 82, and the first series connection point path
91 are connected by a check valve with the bridge like path 93 arranged on main valve.
More specific, priority spool 6 is internally provided with the first check valve 94, and the one end of priority spool 6 and signal path
10 connections, the other end is connected with emptying path 101；And one end of priority spool 6 is provided with variable opening 102, and the other end sets
It is equipped with the compensating spool 103 of UNICOM emptying path 101.
More specific, spring 104 is arranged near the one end for being connected with signal path 10 on priority spool 6, its bullet
Spring 104 according to the action of external signal 5, and can be provided with the 3rd shaft shoulder 105 on priority spool 6, and be provided with valve body and
The corresponding oily path 106 of three shaft shoulder 105, and oily path 106 connects with the bridge like path 93 on main valve, and in variable opening
Check valve 107 is provided between 102 and oily path 106.
When individually operated main valve plug 8, the first series connection point series connection point of path 91 and second path 92 can be with second shaft shoulder
82 and first shaft shoulder 81 movement and reduce, until close.Now, hydraulic oil enters into bridge like path by the first check valve 94
93 and cylinder ports 95 in, and alternate path by priority spool 6 to main valve fuel feeding.
When individually operated priority spool 6, external signal 5, the control priority spool of spring 104 are not acted on signal path 10
6 be in position shown in Fig. 2, now on one end of priority spool 6 arrange variable opening 102 be in maximum opening position, and and
The hydraulic oil on UNICOM road is entered in bridge like path 93 after variable opening 102, check valve 107 from oily path 106 so that
Under minimum pressure loss state, the hydraulic oil in hydraulic pump is supplied parallel alternate path from series via and alternate path
Should be on bridge like path 93.
When the first dipper is operated with main valve 15 and revolution main valve 13 simultaneously, on signal path 10 external signal is received
5, external signal 5 acts on spring 104, makes priority spool 6 to the side shifting away from spring 104.Now, variable opening 102
Aperture area can be reduced as the shaft shoulder 105 of mobile drive the 3rd of priority spool 6 is moved, and series via is turned round with master
The valve element of valve 13 is blocked, and causes the hydraulic oil supplied from the oil-in of first the 3 to the first dipper of hydraulic pump main valve 15 to pass through
The variable opening 102 of priority spool 6 is supplying.So that the first dipper main valve load pressure than the revolution load of main valve 13
In the case that pressure is low, pressure also can be risen to till can driving high capacity side (revolution main valve 13) hydraulic actuator.
Now the pressure from hydraulic pump is the pressure that low-load lateral pressure is produced plus pressure-gradient control valve throttling.
As preferred embodiment, the switching valve in first alternate path 17 of first dipper with main valve 15 it is preferential
It is provided with the priority spool 6 of the switching valve in the second alternate path 26 of the dipper main valve 24 of valve element 6 and second corresponding
Compensating spool 103, compensating spool 103 produces anti-according to the load pressure and external signal 5 of the first dipper or the second dipper
To pressure, the opening increase of the variable opening 102 on priority spool 6 is made, the crushing on path is effectively reduced, so as to improve digging
The aviation fuel and operational coordination of pick machine.
Used as preferred embodiment, the operation signal of the main valve plug 8 of the signal of priority spool 6 and switching valve element is configured at together
Simultaneously go up, it is ensured that the accuracy and reliability of signal control.
The hydraulic crawler excavator hydraulic control device that the present embodiment is provided, including two valve blocks, and each valve block includes main valve
And main valve plug 8 is provided with pressure-gradient control valve, and main valve, priority spool 6 is provided with pressure-gradient control valve, and valve block is internally provided with signal and leads to
Channels in series and parallel port are provided with road 10, and two valve blocks；By arranging pressure-gradient control valve in shunt circuit, by preferential
Collection of the valve to load signal, realizes load signal feedback control to reduce the pressure loss, improves operability and fuel economy；
And by integrated setting valve block structure, the arrangement of valve block being optimized, structure is compacter；Also by the way that the excellent of banked direction control valves will be connected
First valve is integrated in the middle of the main valve switching valve inside main valve, and signalling channel is arranged at into valve inner, effectively reduces hydraulic pressure
Pipe arrangement between device and main frame, makes the structure of valve simpler.
Preferred embodiments of the present invention are these are only, embodiments of the present invention and protection domain is not thereby limited, it is right
For those skilled in the art, should can appreciate that all equivalents with done by description of the invention and diagramatic content are replaced
Resulting scheme is changed and obviously changed, should be included in protection scope of the present invention.
Claims (10)
1. a kind of hydraulic crawler excavator hydraulic control device, it is characterised in that include：Two valve blocks, and valve block is both connected to described in two
On hydraulic pump, each valve block includes being provided with main valve plug in main valve and pressure-gradient control valve, and the main valve, in the pressure-gradient control valve
The main valve plug and the priority spool being provided with priority spool, and the same valve block is arranged parallel and staggered between half
Away from, and the valve block is internally provided with signal path.
2. a kind of hydraulic crawler excavator hydraulic control device according to claim 1, it is characterised in that in each valve block
The some described main valve being provided with some main valves, and the same valve block is connected by series via, and same described
Some described main valve in valve block also communication in parallel.
3. a kind of hydraulic crawler excavator hydraulic control device according to claim 2, it is characterised in that the series via and
The alternate path is all connected on the hydraulic pump.
4. a kind of hydraulic crawler excavator hydraulic control device according to claim 2, it is characterised in that the pressure-gradient control valve is arranged
On the alternate path.
5. a kind of hydraulic crawler excavator hydraulic control device according to claim 1, it is characterised in that arrange in the main valve
There are bridge like path and cylinder ports.
6. a kind of hydraulic crawler excavator hydraulic control device according to claim 1, it is characterised in that in the priority spool
Portion is provided with check valve, and one end of the check valve is connected with signal path, and the other end is connected with emptying path.
7. a kind of hydraulic crawler excavator hydraulic control device according to claim 6, it is characterised in that the priority spool
One end is provided with variable opening, and the other end is provided with the compensating spool of emptying path described in UNICOM.
8. a kind of hydraulic crawler excavator hydraulic control device according to claim 6, it is characterised in that set in the pressure-gradient control valve
It is equipped with check valve.
9. a kind of hydraulic crawler excavator hydraulic control device according to claim 7, it is characterised in that on the priority spool
It is arranged with spring.
10. a kind of hydraulic crawler excavator hydraulic control device according to claim 8 or 5, it is characterised in that the pressure-gradient control valve
Bridge like communication in being inside provided with oily path and main valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710095818.XA CN106593983A (en) | 2017-02-22 | 2017-02-22 | Hydraulic control device of hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710095818.XA CN106593983A (en) | 2017-02-22 | 2017-02-22 | Hydraulic control device of hydraulic excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106593983A true CN106593983A (en) | 2017-04-26 |
Family
ID=58587918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710095818.XA Pending CN106593983A (en) | 2017-02-22 | 2017-02-22 | Hydraulic control device of hydraulic excavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106593983A (en) |
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| CN105864137A (en) * | 2016-06-17 | 2016-08-17 | 合肥长源液压股份有限公司 | Integral type priority multiway valve |
| CN206522291U (en) * | 2017-02-22 | 2017-09-26 | 常熟华威履带有限公司 | A kind of hydraulic crawler excavator hydraulic control device |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103857850A (en) * | 2011-10-07 | 2014-06-11 | 沃尔沃建造设备有限公司 | Priority control system for construction machine |
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| CN103015473A (en) * | 2012-12-10 | 2013-04-03 | 三一重机有限公司 | Priority control method of excavator and movable arm to rotation and priority valve |
| CN103628518A (en) * | 2013-08-12 | 2014-03-12 | 上海三一重机有限公司 | Composite action priority control system and method and excavator |
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| CN104763008A (en) * | 2015-04-21 | 2015-07-08 | 山河智能装备股份有限公司 | Multi-tandem valve group of middle-sized hydraulic excavator |
| CN105864137A (en) * | 2016-06-17 | 2016-08-17 | 合肥长源液压股份有限公司 | Integral type priority multiway valve |
| CN206522291U (en) * | 2017-02-22 | 2017-09-26 | 常熟华威履带有限公司 | A kind of hydraulic crawler excavator hydraulic control device |
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Effective date of registration: 20171123 Address after: 215500 southeast avenue of Changshu Southeast Economic Development Zone, Suzhou, Jiangsu Applicant after: Suote Transmission Equipment Co., Ltd. Address before: 215500 southeast avenue of Changshu Southeast Economic Development Zone, Suzhou, Jiangsu Applicant before: Changshu Huawei Track Co.,Ltd. |
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Application publication date: 20170426 |