CN109356218A - Loading machine distributing valve and loader hydraulic system - Google Patents
Loading machine distributing valve and loader hydraulic system Download PDFInfo
- Publication number
- CN109356218A CN109356218A CN201811397009.5A CN201811397009A CN109356218A CN 109356218 A CN109356218 A CN 109356218A CN 201811397009 A CN201811397009 A CN 201811397009A CN 109356218 A CN109356218 A CN 109356218A
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- Prior art keywords
- hydraulic
- valve
- bound
- controlled switch
- rotating bucket
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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
- E02F9/2264—Arrangements or adaptations of elements for hydraulic 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to loader hydraulic systems, to solve the problems, such as that existing loading arm digging force and rotating bucket digging force are convergent；A kind of loading machine distributing valve is provided, join control bound including swing arm, rotating bucket joins control bound, P hydraulic fluid port, T hydraulic fluid port, first overflow valve, second overflow valve, hydraulic-controlled switch valve, first overflow valve is connected between P hydraulic fluid port and T hydraulic fluid port, the remote control terminal of first overflow valve is concatenated the second overflow valve of connection and hydraulic-controlled switch valve is connect with T hydraulic fluid port, the receipts bucket movement hydraulic control end that rotating bucket joins control bound is connected through the hydraulic control end of oil circuit and hydraulic-controlled switch valve, the setting oil pressure relief of first overflow valve set up oil pressure relief and be greater than the second overflow valve, hydraulic-controlled switch valve is in off state when the hydraulic control end of hydraulic-controlled switch valve is without effective commutation pressure.System pressure different pressure control when the present invention can be realized swing arm lifting and recycling scraper bowl.
Description
Technical field
The present invention relates to a kind of loading machine distributing valves, more specifically to a kind of loading machine distributing valve and loading
Machine hydraulic system.
Background technique
Swing arm digging force, rotating bucket digging force are to evaluate the key parameter of loading machine overall performance, this two parameters can lead to
It crosses equipment optimization to generate, rationally designs hydraulic cylinder cylinder diameter and setting hydraulic system pressure obtains.To use quantitative hydraulic
For system loading machine, due to the limitation of work installation mechanism, needs to realize swing arm digging force by optimization hydraulic cylinder cylinder diameter, turn
The Proper Match for the digging force that struggles against, is limited to hydraulic cylinder cylinder diameter type, and examine for cost and component universality etc.
Consider, the case where complete machine swing arm digging force, rotating bucket digging force non-ideal matching often occurs, therefore set up hydraulic system distributing valve master
Safety valve pressure will lead to the case where complete machine swing arm digging force, rotating bucket digging force " become big " or " becoming small " together, ideal be not achieved
Matching result.
Summary of the invention
The technical problem to be solved by the present invention is to for existing loading arm digging force and rotating bucket digging force is convergent asks
Topic, and a kind of loading machine distributing valve and loader hydraulic for controlling system pressure when swing arm lifts and recycles scraper bowl respectively is provided
System.
The present invention is to realize that the technical solution of its purpose is such that provide a kind of loading machine distributing valve, including swing arm
Join control bound and rotating bucket connection control bound, provide the P oil of working fluid to swing arm connection control bound and rotating bucket connection control bound
Mouthful, for the T hydraulic fluid port of oil return；Characterized by further comprising the first overflow valves with long-range voltage regulation function, the second overflow valve, hydraulic control
Switch valve, first overflow valve are connected between P hydraulic fluid port and T hydraulic fluid port, and the remote control terminal of first overflow valve is concatenated
The second overflow valve and hydraulic-controlled switch valve of connection are connect with T hydraulic fluid port, the receipts bucket movement hydraulic control end warp of the rotating bucket connection control bound
Oil circuit is connect with the hydraulic control end of the hydraulic-controlled switch valve, and the oil pressure relief of setting up of first overflow valve is greater than the second overflow valve
Oil pressure relief is set up, the hydraulic-controlled switch valve is in cut-off shape when the hydraulic control end of the hydraulic-controlled switch valve is without effective commutation pressure
State.
In above-mentioned loading machine distributing valve, the receipts bucket movement hydraulic control end of the rotating bucket connection control bound and the pilot-controlled switch
Shuttle valve, the receipts bucket movement hydraulic control end of the rotating bucket connection control bound and the shuttle valve are provided on oil circuit between the hydraulic control end of valve
The connection of the first oil inlet end, the bucket movement hydraulic control end of putting of the second oil inlet end of the shuttle valve and rotating bucket connection control bound connects
It connects, the oil outlet of the shuttle valve and the hydraulic control end of hydraulic-controlled switch valve connect.
In above-mentioned loading machine distributing valve, the swing arm connection control bound is four six-way transfer valves, the rotating bucket joint control
Main valve processed is three six-way transfer valves, and the swing arm connection control bound and rotating bucket connection control bound use Series-parallel oil circuit structure.
The present invention is to realize that the technical solution of its purpose is such that provide a kind of loader hydraulic system, including swing arm
Join control bound, rotating bucket connection control bound, provide the high pressure of working fluid to swing arm connection control bound and rotating bucket connection control bound
Oil sources, the rotary ink tank being connect with rotating bucket connection control bound, the boom cylinder being connect with swing arm connection control bound and swing arm joint control
Main valve processed joins the pilot valve that control bound hydraulic control end connects, the fuel tank circuit being connected with hydraulic tank with rotating bucket, it is characterised in that
It further include the first overflow valve with long-range voltage regulation function, the second overflow valve, hydraulic-controlled switch valve, first overflow valve is connected to height
Between pressure oil source and fuel tank circuit, the remote control terminal of first overflow valve is concatenated the second overflow valve of connection and hydraulic control is opened
It closes valve to connect with fuel tank circuit, the rotating bucket connection control bound receives bucket movement hydraulic control end through oil circuit and the hydraulic-controlled switch valve
The connection of hydraulic control end, the setting oil pressure relief of first overflow valve set up oil pressure relief and be greater than the second overflow valve, the hydraulic control
The hydraulic-controlled switch valve is in off state when the hydraulic control end of switch valve is without effective commutation pressure.
Further, the hydraulic control end for receiving bucket movement hydraulic control end and the hydraulic-controlled switch valve of rotating bucket connection control bound it
Between oil circuit on be provided with shuttle valve, the first oil inlet end for receiving bucket movement hydraulic control end and the shuttle valve of the rotating bucket connection control bound
Connection, the second oil inlet end of the shuttle valve are connect with the bucket movement hydraulic control end of putting of rotating bucket connection control bound, the shuttle valve
The connection of the hydraulic control end of oil outlet and hydraulic-controlled switch valve.
Further, the swing arm connection control bound is four six-way transfer valves, and the rotating bucket connection control bound is three
Six-way transfer valve, the swing arm connection control bound and rotating bucket connection control bound use Series-parallel oil circuit structure.Namely works as and turned
When bucket operation, swing arm descending operation not can be carried out.
Compared with prior art, the present invention, when carrying out lifting movement, system pressure is the first overflow valve in the present invention
Set pressure, when carrying out receiving bucket movement, hydraulic-controlled switch valve conducting, system pressure is controlled by the second overflow valve, to realize
System pressure different pressure control when swing arm lifting and recycling scraper bowl.
Detailed description of the invention
Fig. 1 is the schematic diagram of loading machine distributing valve of the present invention.
Fig. 2 is the schematic diagram of loader hydraulic system of the present invention.
Parts title and serial number in figure:
Distributing valve 10, the second overflow valve 1, hydraulic-controlled switch valve 2, hydraulic-controlled switch valve 3, the first overflow valve 4, rotating bucket joint control master
Valve 5, the first check valve 6, the big chamber overload protection valve 7 of rotary ink tank, the big chamber repairing check valve 8 of rotary ink tank, the small chamber of rotary ink tank
The small chamber overload protection valve 11 of repairing check valve 9, rotary ink tank, the small chamber repairing check valve 12 of boom cylinder, swing arm join control bound
13, second one-way valve 14, rotary ink tank 15, boom cylinder 16, pilot valve 17, high pressure fuel source 18, pilot oil source 19, hydraulic oil container
20。
Specific embodiment
Illustrate specific embodiment with reference to the accompanying drawing.
Embodiment one.
As shown in Figure 1, the distributing valve 10 in the present embodiment is used for loading machine, to the boom cylinder and rotary ink tank of loading machine
It is controlled.It include that swing arm connection control bound 13 and rotating bucket join control bound 5, join control bound 13 to swing arm in the distributing valve 10
The P hydraulic fluid port of working fluid is provided, for the T hydraulic fluid port of oil return with rotating bucket connection control bound 5；It further include simultaneously with long-range voltage regulation function
The first overflow valve 4, the second overflow valve 1, hydraulic-controlled switch valve 2 etc..
In the present embodiment, swing arm connection control bound 13 is four six-way transfer valves, and it is three six that rotating bucket, which joins control bound 5,
Logical reversal valve, swing arm joins control bound 13 and rotating bucket connection control bound 5 uses Series-parallel oil circuit structure, i.e. rotating bucket joins control bound
5 operating pressure oil oil inlet end is connect by the first check valve 6 with P hydraulic fluid port, the operating pressure oil of swing arm connection control bound 13 into
Oily end joins control bound 5 with rotating bucket by second one-way valve 14 and connect, and passes through rotating bucket when rotating bucket connection control bound 5 is in middle position
Join the operating pressure oil that control bound 5 obtains the offer of P hydraulic fluid port.When rotating bucket connection control bound 5 is in left position or right position, P hydraulic fluid port
Hydraulic oil cannot be transported to swing arm connection control bound 13, namely when there is rotating bucket movement, not can be carried out swing arm descending operation, from
And realize that rotating bucket movement is preferential.
In the distributing valve 10, there is the A1 hydraulic fluid port and B1 hydraulic fluid port of connection rotating bucket connection 5 actuator port of control bound, connection is dynamic
The A2 hydraulic fluid port and B2 hydraulic fluid port of arm connection 13 actuator port of control bound receive the b1 that bucket movement hydraulic control end is connect with rotating bucket connection control bound
Hydraulic fluid port puts the a1 hydraulic fluid port and swing arm connection control bound swing arm lifting movement that bucket movement hydraulic control end is connect with rotating bucket connection control bound
The a2 hydraulic fluid port that the b2 hydraulic fluid port of hydraulic control end connection is connected with swing arm decline hydraulic control end.
The big chamber overload protection valve of rotary ink tank is set between two actuator ports and T hydraulic fluid port of rotating bucket connection control bound 5
7, the small chamber overload protection valve 11 of rotary ink tank, the big chamber repairing check valve 8 of rotary ink tank, the small chamber repairing check valve 9 of rotary ink tank；It is dynamic
The small chamber repairing check valve of boom cylinder is provided between the small chamber connection hydraulic fluid port of the boom cylinder of arm connection control bound 13 and T hydraulic fluid port
12。
First overflow valve 4 is connected between P hydraulic fluid port and T hydraulic fluid port, and the remote control terminal of the first overflow valve 4 is concatenated connection
Second overflow valve 1 and hydraulic-controlled switch valve 3 are connect with T hydraulic fluid port, and rotating bucket joins the receipts bucket movement hydraulic control end of control bound 5 through oil circuit and liquid
Control switch valve 2 hydraulic control end connection, rotating bucket join control bound 5 receive bucket movement hydraulic control end and hydraulic-controlled switch valve 2 hydraulic control end it
Between oil circuit on be provided with shuttle valve 3, the receipts bucket of rotating bucket connection control bound 5 acts hydraulic control end and connect with the first oil inlet end of shuttle valve 3,
Second oil inlet end of shuttle valve 3 is connect with the bucket movement hydraulic control end of putting of rotating bucket connection control bound 5, and oil outlet and the hydraulic control of shuttle valve 3 are opened
Close the hydraulic control end connection of valve 2.The setting oil pressure relief of first overflow valve 4 set up oil pressure relief and be greater than the second overflow valve 1, hydraulic control
When the hydraulic control end of switch valve 2 is without effective commutation pressure namely without rotating bucket operation, hydraulic-controlled switch valve 2 is in off state.
Embodiment two.
As shown in Fig. 2, the hydraulic system in the present embodiment is hydraulic system of loading machine working device comprising high pressure fuel source
18, pilot valve 17, hydraulic oil container 20, rotary ink tank 15, boom cylinder 16, pilot oil source 19 and embodiment one kind distributing valve
10.High pressure fuel source 18 is made of constant displacement pump or variable pump, and high pressure fuel source 18 is connect with the P hydraulic fluid port of distributing valve 10, from hydraulic oil container
It is pumped by output after drawing low pressure oil in 20, to 10 fuel feeding of distributing valve, T hydraulic fluid port is connect through fuel tank circuit with hydraulic oil container 20.
The big chamber and small chamber of rotary ink tank 15 pass through the A1 hydraulic fluid port and B1 hydraulic fluid port of piping connection distributing valve 10 respectively, boom cylinder 16 it is big
Chamber is connected by the A2 hydraulic fluid port that pipeline is separately connected distributing valve 10 with B2 hydraulic fluid port with small chamber, and pilot oil source 19 can be by pioneer pump structure
At to pilot valve fuel feeding after draw oil boosting in hydraulic oil container, pilot oil source 19 is also possible to from high pressure oil pioneer pump
Pressure oil is obtained at source 18 and after pressure reducing valve is depressured as the pressure oil-source of pilot valve.In pilot valve rotating bucket connection pilot valve with
The a1 hydraulic fluid port of distributing valve is connected with b1 hydraulic fluid port, is realized the receipts bucket movement of scraper bowl and is put bucket movement (namely discharging movement), pilot valve
Swing arm connection connection distributing valve a2 hydraulic fluid port and b2 hydraulic fluid port, realize the lifting and lowering action of swing arm.
In this hydraulic system, when the pantograph linkage of pilot valve 17 is made, the pilot pressure signal transmitting of pilot valve output
Hydraulic control end is lifted to the swing arm decline hydraulic control end of swing arm connection control bound or swing arm, the spool of swing arm connection control bound is in left position
Or right position, hydraulic oil enter the small chamber of boom cylinder or big chamber through swing arm connection control bound, swing arm realizes decline, floating declines or mention
Movement is risen, because two hydraulic control ends of rotating bucket connection control bound are inputted without pilot pressure signal at this time, hydraulic-controlled switch valve is in
Right position cut-off, system pressure is controlled by the first overflow valve 4 at this time.When the rotating bucket of pilot valve 17 connection has rotating bucket operation, guide
The rotating bucket pilot pressure signal that valve 17 exports makes rotating bucket connection control bound 5 commutate, and passes through rotating bucket in left position or right position, hydraulic oil
Connection control bound 5 enters the big chamber or small chamber of rotary ink tank 15, realizes that scraper bowl receives bucket movement or puts bucket discharging movement.First simultaneously
The rotating bucket pilot pressure signal effect of the rotating bucket connection output of pilot valve and shuttle valve, the hydraulic control through shuttle valve 3 effect and hydraulic-controlled switch valve 2
End makes hydraulic-controlled switch valve 2 be in left position conducting, and the remote control terminal of the first overflow valve 4 is concatenated the second overflow of connection at this time
Valve 1 and hydraulic-controlled switch valve 2 are connected to T hydraulic fluid port, and system pressure is controlled by the second overflow valve 1.In the hydraulic system, pressed
When power is set, 4 set pressure of the first overflow valve must be greater than the set pressure of the second overflow valve 1, and otherwise the second overflow valve 1 does not act as
With.To sum up, when carrying out the movements such as swing arm decline, swing arm lifting, system pressure is controlled by the first overflow valve 4, carries out scraper bowl receipts
When bucket acts and put bucket discharging movement, system pressure is controlled by the second overflow valve 1, thus when realizing that rotating bucket operation and swing arm operate
The control respectively of system pressure, i.e. rotating bucket digging force is not identical as the HYDRAULIC CONTROL SYSTEM pressure of swing arm digging force, in this system
The hydraulic system pressure of swing arm digging force is greater than rotating bucket digging force hydraulic system pressure.
In the present embodiment, the receipts bucket that the hydraulic control end of hydraulic-controlled switch valve can also only join control bound with rotating bucket acts hydraulic control
End connects, when not connect with the bucket movement hydraulic control end of putting of rotating bucket connection control bound, namely only carrying out receiving bucket movement, pilot-controlled switch
Valve is in left position, and system pressure is controlled by the second overflow valve；When carrying out swing arm lifting, declining or putting bucket discharging, system pressure
All controlled by the first overflow valve.
In the loader hydraulic system of the present embodiment, distributing valve can also be disassembled, such as distributing valve joins comprising rotating bucket
Control bound, swing arm linkage control valve and each carry protect valve and repairing check valve, check valve etc., and the first overflow valve, second
Overflow valve and hydraulic-controlled switch valve are independently of distributing valve and hydraulic fluid port corresponding to what is drawn in distributing valve connection, to realize that rotating bucket is grasped
The control respectively of system pressure when work and swing arm operate.
Claims (6)
1. a kind of loading machine distributing valve, including swing arm connection control bound and rotating bucket join control bound, join control bound to swing arm
The P hydraulic fluid port of working fluid is provided, for the T hydraulic fluid port of oil return with rotating bucket connection control bound；Characterized by further comprising the long-range tune of band
Press the first overflow valve, the second overflow valve, hydraulic-controlled switch valve of function, first overflow valve be connected to P hydraulic fluid port and T hydraulic fluid port it
Between, the remote control terminal of first overflow valve is concatenated the second overflow valve of connection and hydraulic-controlled switch valve is connect with T hydraulic fluid port, institute
The receipts bucket movement hydraulic control end for stating rotating bucket connection control bound is connect through oil circuit with the hydraulic control end of the hydraulic-controlled switch valve, and described first overflows
Flow the setting oil pressure relief of valve set up oil pressure relief and be greater than the second overflow valve, the hydraulic control end of the hydraulic-controlled switch valve is without effectively changing
The hydraulic-controlled switch valve is in off state when to pressure.
2. loading machine distributing valve according to claim 1, it is characterised in that the receipts bucket of the rotating bucket connection control bound is dynamic
Make to be provided with shuttle valve on the oil circuit between hydraulic control end and the hydraulic control end of the hydraulic-controlled switch valve, the receipts of the rotating bucket connection control bound
Bucket movement hydraulic control end is connect with the first oil inlet end of the shuttle valve, the second oil inlet end of the shuttle valve and the rotating bucket joint control master
Valve puts bucket movement hydraulic control end connection, and the oil outlet of the shuttle valve and the hydraulic control end of hydraulic-controlled switch valve connect.
3. loading machine distributing valve according to claim 1 or 2, it is characterised in that the swing arm connection control bound is four
Six-way transfer valve, the rotating bucket connection control bound is three six-way transfer valves, the swing arm connection control bound and rotating bucket joint control system
Main valve uses Series-parallel oil circuit structure.
4. a kind of loader hydraulic system, including swing arm connection control bound, rotating bucket connection control bound, join to swing arm control bound and
High pressure fuel source, the rotary ink tank connecting with rotating bucket connection control bound and the swing arm that rotating bucket connection control bound provides working fluid join
Control bound connection boom cylinder, with swing arm connection control bound and rotating bucket connection control bound hydraulic control end connect pilot valve, and
Hydraulic oil container connection fuel tank circuit, it is characterised in that further include the first overflow valve with long-range voltage regulation function, the second overflow valve,
Hydraulic-controlled switch valve, first overflow valve are connected between high pressure fuel source and fuel tank circuit, the long-range control of first overflow valve
End processed is concatenated the second overflow valve of connection and hydraulic-controlled switch valve is connect with fuel tank circuit, the receipts bucket of the rotating bucket connection control bound
Movement hydraulic control end is connect through oil circuit with the hydraulic control end of the hydraulic-controlled switch valve, and the setting oil pressure relief of first overflow valve is greater than
The setting oil pressure relief of second overflow valve, the hydraulic-controlled switch valve when hydraulic control end of the hydraulic-controlled switch valve is without effective commutation pressure
In off state.
5. loader hydraulic system according to claim 4, it is characterised in that the receipts bucket of the rotating bucket connection control bound is dynamic
Make to be provided with shuttle valve on the oil circuit between hydraulic control end and the hydraulic control end of the hydraulic-controlled switch valve, the receipts of the rotating bucket connection control bound
Bucket movement hydraulic control end is connect with the first oil inlet end of the shuttle valve, the second oil inlet end of the shuttle valve and the rotating bucket joint control master
Valve puts bucket movement hydraulic control end connection, and the oil outlet of the shuttle valve and the hydraulic control end of hydraulic-controlled switch valve connect.
6. loader hydraulic system according to claim 4 or 5, it is characterised in that the swing arm connection control bound is four
Six-way transfer valve, the rotating bucket connection control bound is three six-way transfer valves, the swing arm connection control bound and rotating bucket joint control system
Main valve uses Series-parallel oil circuit structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811397009.5A CN109356218B (en) | 2018-11-22 | 2018-11-22 | Distribution valve for loader and loader hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811397009.5A CN109356218B (en) | 2018-11-22 | 2018-11-22 | Distribution valve for loader and loader hydraulic system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109356218A true CN109356218A (en) | 2019-02-19 |
| CN109356218B CN109356218B (en) | 2021-07-02 |
Family
ID=65338352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811397009.5A Active CN109356218B (en) | 2018-11-22 | 2018-11-22 | Distribution valve for loader and loader hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109356218B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984285A (en) * | 2019-12-09 | 2020-04-10 | 广西柳工机械股份有限公司 | Distribution valve for loader and loader hydraulic system |
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| CN108179780A (en) * | 2018-02-23 | 2018-06-19 | 吉林大学 | A kind of electric drive loading machine electronic-hydraulic complex control system and its control method |
| CN207620022U (en) * | 2017-11-24 | 2018-07-17 | 山东临工工程机械有限公司 | Folder wood fork loading machine energy-saving hydraulic system |
| CN207749563U (en) * | 2017-11-13 | 2018-08-21 | 广西柳工机械股份有限公司 | Combination valve and loading arm hydraulic system of working |
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2018
- 2018-11-22 CN CN201811397009.5A patent/CN109356218B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016093378A1 (en) * | 2014-12-08 | 2016-06-16 | 볼보 컨스트럭션 이큅먼트 에이비 | Flow rate control device for construction machine |
| JP2016125521A (en) * | 2014-12-26 | 2016-07-11 | 日立建機株式会社 | Working machine |
| CN207749563U (en) * | 2017-11-13 | 2018-08-21 | 广西柳工机械股份有限公司 | Combination valve and loading arm hydraulic system of working |
| CN207620022U (en) * | 2017-11-24 | 2018-07-17 | 山东临工工程机械有限公司 | Folder wood fork loading machine energy-saving hydraulic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110984285A (en) * | 2019-12-09 | 2020-04-10 | 广西柳工机械股份有限公司 | Distribution valve for loader and loader hydraulic system |
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| Publication number | Publication date |
|---|---|
| CN109356218B (en) | 2021-07-02 |
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