CN106194881A - Directional control valve group and hydraulic system - Google Patents
Directional control valve group and hydraulic system Download PDFInfo
- Publication number
- CN106194881A CN106194881A CN201610835087.3A CN201610835087A CN106194881A CN 106194881 A CN106194881 A CN 106194881A CN 201610835087 A CN201610835087 A CN 201610835087A CN 106194881 A CN106194881 A CN 106194881A
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- China
- Prior art keywords
- oil circuit
- valve
- executive component
- oil
- hydraulic fluid
- Prior art date
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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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
Abstract
The invention discloses a kind of directional control valve group and hydraulic system, relate to Hydraulic Field, during in order to realize only one group in-line and return line, the independence to two executive components controls, and portable construction.Direction control valve group includes the first valve and the second valve；First valve includes the first oil circuit and the second oil circuit；Second valve includes the 3rd oil circuit and the 4th oil circuit；Wherein, the first oil circuit and the 3rd oil circuit can connect, and the second oil circuit and the 4th oil circuit can connect.Technique scheme, when only one group oil-feed and return line, also can control two executive component actions respectively.In whole valve group, valve block and the valve of application can be all hydraulic universal part, it is simple to production, low cost.
Description
Technical field
The present invention relates to Hydraulic Field, be specifically related to a kind of directional control valve group and hydraulic system.
Background technology
In prior art, if to use one group of oil-feed and return line, go to control two executive component actions respectively, need
Using the solenoid electric valve group of two clematis stem, its principle is as shown in Figure 1.Two clematis stem solenoid electric valve groups are mainly by one two
Electromagnetic valve and the corresponding valve block of position clematis stem combine.
These two clematis stem solenoid electric valve groups include six hydraulic fluid ports: P1, P2, C1, C2, C3, C4.P2 hydraulic fluid port is as oil-feed
Mouthful, P1 hydraulic fluid port is as oil return opening.Hydraulic fluid port C4 and C1 connects the first executive component, and hydraulic fluid port C3 and C2 connects the second executive component.
Two clematis stem concrete principles of solenoid electric valve group are: if P2 enters hydraulic oil, P1 oil return, at electric magnet no power
Time, the first executive component action；When electric magnet is energized, the second executive component action.
Inventor finds, at least there is following problems in prior art: if only one group oil-feed of hydraulic system at present and returning
Oil pipe line, but needs to control two executive component actions respectively, then have to use two clematis stem solenoid electric valve groups.Two clematis stem
Solenoid electric valve group is special electromagnetic valve, manufactures extremely difficult.
Summary of the invention
One of them purpose of the present invention is to propose a kind of directional control valve group and hydraulic system, in order to realize only one group
When in-line and return line, the independence to two executive components controls, and is easy to processing and manufacturing.
For achieving the above object, the invention provides techniques below scheme:
The invention provides a kind of directional control valve group, including the first valve and the second valve；Described first valve includes the first oil
Road and the second oil circuit；Described second valve includes the 3rd oil circuit and the 4th oil circuit；Wherein, described first oil circuit and described 3rd oil circuit
Can connect, described second oil circuit can connect with described 4th oil circuit.
In an alternate embodiment of the invention, one of them hydraulic fluid port of described first oil circuit and described second oil circuit shares.
In an alternate embodiment of the invention, one of them hydraulic fluid port of described 3rd oil circuit and described 4th oil circuit shares.
In an alternate embodiment of the invention, described first valve includes two position four-way valves or two-position three-way valve.
In an alternate embodiment of the invention, described second valve includes two position four-way valves or two-position three-way valve.
In an alternate embodiment of the invention, when described first valve and described second valve are all in power failure state, described first oil circuit
Simultaneously turn on described 3rd oil circuit, and fluid can enter after the first executive component through by the described 3rd via described first oil circuit
Oil circuit flows out, to realize the action of described first executive component.
In an alternate embodiment of the invention, when described first valve and described second valve are all in power failure state, described first oil circuit
Simultaneously turn on described 3rd oil circuit, and fluid can enter after the first executive component through by described first via described 3rd oil circuit
Oil circuit flows out, to realize the counteragent of described first executive component.
In an alternate embodiment of the invention, when described first valve and described second valve are all in obtaining electricity condition, described second oil circuit
Simultaneously turn on described 4th oil circuit, and fluid can enter after the second executive component through by the described 4th via described second oil circuit
Oil circuit flows out, to realize the action of described second executive component.
In an alternate embodiment of the invention, when described first valve and described second valve are all in obtaining electricity condition, described second oil circuit
Simultaneously turn on described 4th oil circuit, and fluid can enter after the second executive component through by described second via described 4th oil circuit
Oil circuit flows out, to realize the counteragent of described second executive component.
The embodiment of the present invention also provides for a kind of hydraulic system, including the first executive component, the second executive component and the present invention
The directional control valve group that arbitrary technical scheme is provided；
Described first executive component is located between described first oil circuit and described 3rd oil circuit, and described second executive component sets
Between described second oil circuit and described 4th oil circuit.
Based on technique scheme, the embodiment of the present invention at least can produce following technique effect:
Technique scheme, uses two single valves to be collectively forming fluid flow path, when needs use, by first
Executive component is arranged between the first oil circuit and the 3rd oil circuit, the second executive component is arranged on the second oil circuit and the 4th oil circuit it
Between, thus can form two loops: first loop is the first oil circuit, the first executive component, the 3rd oil circuit；By this first
Loop can realize the control to the first executive component.Second loop is the second oil circuit, the second executive component, the 4th oil circuit；Logical
Cross this second servo loop and can realize the control to the second executive component.Visible, technique scheme, when only one group in-line and
Return line, also can control two executive component actions respectively.In whole valve group, valve block and the valve of application can be all hydraulic universal
Part, it is simple to production, low cost.It addition, the directional control valve group that technique scheme provides, portable construction, with low cost, performance
Reliable and stable.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the principle schematic of two clematis stem electromagnetic valve groups in prior art；
The directional control valve group principle schematic that Fig. 2 provides for the embodiment of the present invention；
The directional control valve group that Fig. 3 provides for the embodiment of the present invention uses view；
The directional control valve overall structure schematic diagram that Fig. 4 provides for the embodiment of the present invention.
Reference: 1, the first valve；2, the second valve；3, the first executive component；4, the second executive component.
Detailed description of the invention
The technical scheme provided the present invention below in conjunction with Fig. 2～Fig. 4 illustrates in more detail.
The present embodiment needs technical term or the explanation of nouns used.
Valve block (or referred to as valve body): having hydraulic oil port on it, two position four-way solenoid valves are mounted thereon, and have between the two
Corresponding sealing.By controlling the position of valve core of the electromagnetic valve, it is achieved the control to hydraulic oil direction.
Two position four-way solenoid valves: have two operating positions, when solenoid valves, are operated in the machine near electric magnet side
Energy；Otherwise, it is operated in the function of spring side, as shown in Figure 2.
Seeing Fig. 1, the embodiment of the present invention provides a kind of directional control valve group, including the first valve 1 and the second valve 2.First valve 1
Including the first oil circuit and the second oil circuit；Second valve 2 includes the 3rd oil circuit and the 4th oil circuit.Wherein, the first oil circuit and the 3rd oil circuit
Can connect, the second oil circuit and the 4th oil circuit can connect.
First valve 1 can be two-bit triplet electromagnetic valve, two-bit triplet hand-operated valve, two position four-way solenoid valves, two four-way handss
Dynamic valve, above-mentioned valve can be board-like or plug-in.Second valve 2 can be two-bit triplet electromagnetic valve, two-bit triplet hand-operated valve, two
Position four-way solenoid valve, two four-way hand-operated valves, above-mentioned valve can be board-like or plug-in.
In the present embodiment, as a example by using the electromagnetic valve shown in Fig. 2, the first oil circuit is the oil circuit between hydraulic fluid port P1 and P3,
Second oil circuit is the oil circuit between hydraulic fluid port P1 and P4.3rd oil circuit is the oil circuit between hydraulic fluid port P5 and P7, and the 4th oil circuit is hydraulic fluid port
Oil circuit between P5 and P8.
Technique scheme, uses two single valves to be collectively forming fluid flow path, when needs use, by first
Executive component 3 is arranged between the first oil circuit and the 3rd oil circuit, the second executive component 4 is arranged on the second oil circuit and the 4th oil circuit it
Between, thus can form two loops: first loop is the first oil circuit, the first executive component the 3, the 3rd oil circuit.By this
Primary Ioops can realize the control to the first executive component 3.Second loop is the second oil circuit, the second executive component the 4, the 4th oil
Road.The control to the second executive component 4 can be realized by this second servo loop.
First executive component 3 can be oil cylinder, hydraulic motor etc.；Second executive component 4 can be oil cylinder, hydraulic motor
Deng.
If the first executive component 3 be can the oil cylinder of bidirectional-movement, in the hydraulic system of only one group of oil-feed and oil return pipe,
The hydraulic fluid port P1 that first oil circuit is not connected with the first executive component 3 connects with in-line, the 3rd oil circuit not with the first executive component 3
The hydraulic fluid port P5 connected is connected with return line, so can realize the action of the first executive component 3, stretching out of such as oil cylinder.If the
One executive component 3 be can the element of counteragent, then the 3rd oil circuit is not connected with the first executive component 3 hydraulic fluid port P5 and oil-feed
Pipeline connection, the hydraulic fluid port P1 that the first oil circuit is not connected with the first executive component 3 is connected with return line and can realize first and perform unit
The retraction of the counteragent of part 3, such as oil cylinder.In actual use, can be by into and out of oil pipe line and directional control valve group
Between the mode of reversal valve be set avoid changing the position into and out of hydraulic fluid port, and the two-way of the first executive component 3 can be realized simultaneously
Action.
In like manner, if the second executive component 4 be can the oil cylinder of bidirectional-movement, only have one group of oil-feed and the hydraulic pressure of oil return pipe at this
In system, the hydraulic fluid port P1 that the second oil circuit is not connected with the first executive component 3 connects with in-line, and the 4th oil circuit is not held with first
The hydraulic fluid port P5 that units 3 connects is connected with return line, so can realize the action of the second executive component 4, stretching of such as oil cylinder
Go out.If the second executive component 4 be can the element of counteragent, then the hydraulic fluid port that the 4th oil circuit is not connected with the second executive component 4
P5 connects with in-line, and the hydraulic fluid port P1 that the second oil circuit is not connected with the second executive component 4 is connected with return line can realize
The counteragent of two executive components 4, the retraction of such as oil cylinder.In actual use, can be by into and out of oil pipe line and direction
The mode of reversal valve is set between control valve group and avoids changing the position into and out of hydraulic fluid port, and second can be realized simultaneously perform unit
The bidirectional-movement of part 4.
For ease of directional control valve group being connected with in-line or return line, the first oil circuit and the second oil circuit are wherein
One hydraulic fluid port shares, and in the present embodiment, i.e. hydraulic fluid port P1 is for sharing hydraulic fluid port.
For ease of directional control valve group being connected with return line or in-line, the 3rd oil circuit and the 4th oil circuit are wherein
One hydraulic fluid port shares, and in the present embodiment, i.e. hydraulic fluid port P5 is for sharing hydraulic fluid port.
Herein, the first valve 1 includes two position four-way valves or two-position three-way valve.In the present embodiment, the first valve 1 is two four energisings
Magnet valve, is specifically as follows board-like or plug-in.
Seeing Fig. 2, the second valve 2 includes two position four-way valves or two-position three-way valve.In the present embodiment, the second valve 2 is two four
Three-way electromagnetic valve, is specifically as follows board-like or plug-in.
See Fig. 2, when the first valve 1 and the second valve 2 are all in power failure state, and the first oil circuit and the 3rd oil circuit simultaneously turn on,
And fluid can enter through being flowed out by the 3rd oil circuit after the first executive component 3 via the first oil circuit, to realize the first executive component 3
Action.
In like manner, when the first valve 1 and the second valve 2 are all in obtaining electricity condition, and the second oil circuit and the 4th oil circuit simultaneously turn on, and oil
After liquid can enter the second executive component 4 via the second oil circuit, warp is flowed out by the 4th oil circuit, to realize the dynamic of the second executive component 4
Make.
Holding above-mentioned, see Fig. 2 and Fig. 3, the first valve 1 is two four-way electromagnetic control valves, and it includes hydraulic fluid port P1～P4；Hydraulic fluid port
P1 and hydraulic fluid port P3 connects formation the first oil circuit, and hydraulic fluid port P1 and hydraulic fluid port P4 connects formation the second oil circuit, and hydraulic fluid port P2 connects fuel tank.Second
Valve 2 is two four-way electromagnetic control valves, and it includes hydraulic fluid port P5～P8.Hydraulic fluid port P5 and hydraulic fluid port P7 connects formation the 3rd oil circuit, hydraulic fluid port
P5 and hydraulic fluid port P8 connects formation the 4th oil circuit, and hydraulic fluid port P6 connects fuel tank.The hydraulic fluid port a2 of the first executive component 3 connects the first valve 1 oil
Mouth P3, the hydraulic fluid port b2 of the first executive component 3 connect the second valve 2 hydraulic fluid port P7.The hydraulic fluid port a1 of the second executive component 4 connects the first valve 1
Hydraulic fluid port P4, the hydraulic fluid port b1 of the second executive component 4 connect the second valve 2 hydraulic fluid port P8.
On the premise of hydraulic fluid port P1 enters hydraulic oil, hydraulic fluid port P5 oil return, if the first valve 1 and the second valve 2 dead electricity simultaneously, can realize
The action of the first executive component 3, stretching out of the such as first executive component 3；The first valve 1 and the second valve 2 simultaneously electric situation
Under, the action of the second executive component 4, stretching out of the such as second executive component 4 can be realized.
If the first executive component 3 be can the Hydraulic Elements of counteragent, when the first valve 1 and the second valve 2 are all in dead electricity shape
State, the first oil circuit and the 3rd oil circuit simultaneously turn on, and fluid can enter after the first executive component 3 through by first via the 3rd oil circuit
Oil circuit flows out, to realize the counteragent of the first executive component 3.
If the second executive component 4 be can the Hydraulic Elements of counteragent, when the first valve 1 and the second valve 2 all in electric shape
State, the second oil circuit and the 4th oil circuit simultaneously turn on, and fluid can enter after the second executive component 4 through by second via the 4th oil circuit
Oil circuit flows out, to realize the counteragent of the second executive component 4.
Foregoing is explained in detail below, sees Fig. 3, on the premise of hydraulic fluid port P5 enters hydraulic oil, hydraulic fluid port P1 oil return, at the first valve
1 and second in the case of valve 2 simultaneously dead electricity, can realize the counteragent of the first executive component 3, the such as first executive component 3
Retraction.The first valve 1 and the second valve 2 simultaneously electric in the case of, can realize the counteragent of the second executive component 4, such as
The retraction of one executive component 3.
Technique scheme, uses two conventional valve to realize at only one group of oil-feed and return line two executive components
Independent control, and directional control valve group do not includes particular usage valve, it is simple to manufacture, compact conformation.
Seeing Fig. 3 and Fig. 4, the first above-mentioned valve 1 and the second valve 2 can be integrated in same valve body, and this valve body is provided with six
Individual hydraulic oil port, the most respectively A1～A3, B1～B3.Valve inner is located at by first valve 1 and the second valve 2, especially by
Screw plug and installation screw are connected with valve body.First valve 1 and the second valve 2 are all board-like two position four-way solenoid valves.The hydraulic fluid port of the first valve 1
P1 connects with hydraulic fluid port A3, and hydraulic fluid port P5 with B3 of the second valve 2 connects, A3 and B3 one of them as oil-in, another as return
Hydraulic fluid port.Hydraulic fluid port A1 connects the first valve 1 hydraulic fluid port P4 and the second executive component 4 hydraulic fluid port a1, and hydraulic fluid port A2 connects the second executive component 4 hydraulic fluid port
B1 and the second valve 2 hydraulic fluid port P8, hydraulic fluid port B1 connect the first valve 1 hydraulic fluid port P3 and the first executive component 3 hydraulic fluid port a2, and hydraulic fluid port B2 then connects
One executive component 3 hydraulic fluid port b2 and the second valve 2 hydraulic fluid port P7.
The directional control valve group that technique scheme provides, its control principle is: when A3 mouth oil-feed, B3 mouth are fuel-displaced, logical
Crossing two electromagnetic valves of control to be energized or no power, control A1 mouth is fuel-displaced, A2/B3 mouth oil return, or B1 mouth is fuel-displaced, B2/B3 simultaneously
Mouth oil return, it is possible to achieve two different actuator movements are selected independent control.
Specific as follows:
If 1 A3 mouth enters hydraulic oil, and the first valve 1 (i.e. electromagnetic valve CT1) and the second valve 2 (i.e. electromagnetic valve CT2) all must not
Electricity, now, hydraulic oil, by hydraulic fluid port A3, flows to the entrance of the first executive component 3, then oil return line through electromagnetic valve CT1 from B1 mouth
Through B2 mouth from B3 mouth oil return.Now, the only first executive component 3 action, the second executive component 4 attonity.Second executive component 4
Actuator port P2 connects T mouth oil sump tank.Second executive component 4 working oil path A1 and A2 mouth above electromagnetic valve takes back fuel tank.
In like manner, if B3 mouth enters hydraulic oil, A3 mouth oil return, now the first executive component 3 counteragent.
If 2 A3 mouths enter hydraulic oil, and electromagnetic valve CT1 and the second valve electromagnetic valve CT2 obtains electric, and now, hydraulic oil is by hydraulic fluid port
A3, flows to the entrance of the second executive component 4 through electromagnetic valve CT1 from A1 mouth, then oil return line through A2 mouth from B3 mouth oil return.This
Time, the only second executive component 4 action, the first executive component 3 attonity.Second valve 2 actuator port P6 connects fuel tank.First performs
Element 3 working oil path B1 and B2 mouth above electromagnetic valve takes back fuel tank.In like manner, if B3 mouth enters hydraulic oil, A3 mouth oil return, now
Second executive component 4 counteragent.
The directional control valve that technique scheme provides, by using board-like two position four-way valve two and valve block, composition
Directional control valve, it is achieved the function of two six-way valve groups.That is: in single hydraulic circuit, utilize the direction control valve group can be
Single loop realizes independently controlling the selection of two executive components.And, this valve group uses universaling electromagnetic valve, valve block processing side
Just, there is production, low cost of manufacture, the features such as versatility is good, the manufacturing cycle is short.
The embodiment of the present invention also provides for a kind of hydraulic system, and it includes first executive component the 3, second executive component 4 and basis
Invent the directional control valve group that arbitrary technical scheme provides.First executive component 3 is located between the first oil circuit and the 3rd oil circuit, the
Two executive components 4 are located between the second oil circuit and the 4th oil circuit.
In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", "front", "rear",
The orientation of the instruction such as "left", "right", " vertically ", " level ", " top ", " end ", " interior ", " outward " or position relationship are for based on accompanying drawing institute
The orientation shown or position relationship, be only for ease of describing the present invention and simplifying the device describing rather than indicating or infer indication
Or element must have specific orientation, for specific azimuth configuration and operation, thus it is not intended that in protecting the present invention
The restriction held.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although
With reference to previous embodiment, the present invention is described in detail, it will be understood by those within the art that: it still may be used
So that the technical scheme described in foregoing embodiments to be modified, or wherein portion of techniques feature is carried out equivalent,
But these amendment or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. a directional control valve group, it is characterised in that include the first valve (1) and the second valve (2)；Described first valve (1) includes
First oil circuit and the second oil circuit；Described second valve (2) includes the 3rd oil circuit and the 4th oil circuit；Wherein, described first oil circuit and institute
Stating the 3rd oil circuit can connect, described second oil circuit can connect with described 4th oil circuit.
Directional control valve group the most according to claim 1, it is characterised in that when described first valve (1) and described second valve
(2) all in power failure state, described first oil circuit and described 3rd oil circuit simultaneously turn on, and fluid can be via described first oil circuit
Enter the first executive component (3) to flow out by by described 3rd oil circuit, to realize the action of described first executive component (3).
Directional control valve group the most according to claim 1, it is characterised in that when described first valve (1) and described second valve
(2) all in power failure state, described first oil circuit and described 3rd oil circuit simultaneously turn on, and fluid can be via described 3rd oil circuit
Enter the first executive component (3) to flow out by by described first oil circuit, to realize the most dynamic of described first executive component (3)
Make.
Directional control valve group the most according to claim 1, it is characterised in that when described first valve (1) and described second valve
(2) all in obtaining electricity condition, described second oil circuit and described 4th oil circuit simultaneously turn on, and fluid can be via described second oil circuit
Enter the second executive component (4) to flow out by by described 4th oil circuit, to realize the action of described second executive component (4).
Directional control valve group the most according to claim 1, it is characterised in that when described first valve (1) and described second valve
(2) all in obtaining electricity condition, described second oil circuit and described 4th oil circuit simultaneously turn on, and fluid can be via described 4th oil circuit
Enter the second executive component (4) to flow out by by described second oil circuit, to realize the most dynamic of described second executive component (4)
Make.
6. according to the arbitrary described directional control valve group of claim 1-5, it is characterised in that described first oil circuit and described second
One of them hydraulic fluid port of oil circuit shares.
7. according to the arbitrary described directional control valve group of claim 1-5, it is characterised in that described 3rd oil circuit and the described 4th
One of them hydraulic fluid port of oil circuit shares.
8. according to the arbitrary described directional control valve group of claim 1-5, it is characterised in that described first valve (1) includes two
Cross valve or two-position three-way valve.
9. according to the arbitrary described directional control valve group of claim 1-5, it is characterised in that described second valve (2) includes two
Cross valve or two-position three-way valve.
10. a hydraulic system, it is characterised in that include the first executive component (3), the second executive component (4) and claim
The arbitrary described directional control valve group of 1-9；
Described first executive component (3) is located between described first oil circuit and described 3rd oil circuit, described second executive component (4)
It is located between described second oil circuit and described 4th oil circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610835087.3A CN106194881B (en) | 2016-09-20 | 2016-09-20 | Direction controlling valve group and hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610835087.3A CN106194881B (en) | 2016-09-20 | 2016-09-20 | Direction controlling valve group and hydraulic system |
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| CN106194881A true CN106194881A (en) | 2016-12-07 |
| CN106194881B CN106194881B (en) | 2019-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610835087.3A Active CN106194881B (en) | 2016-09-20 | 2016-09-20 | Direction controlling valve group and hydraulic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108730256A (en) * | 2018-08-07 | 2018-11-02 | 徐州徐工基础工程机械有限公司 | A kind of function switch solenoid valve block and hydraulic system |
| CN108953308A (en) * | 2018-09-12 | 2018-12-07 | 徐州徐工基础工程机械有限公司 | One kind can expand multi-functional electrohydraulic system and working method |
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| CN203542853U (en) * | 2013-10-31 | 2014-04-16 | 永州恒丰机械有限公司 | Hydraulic feeding device of concrete mixer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108953308A (en) * | 2018-09-12 | 2018-12-07 | 徐州徐工基础工程机械有限公司 | One kind can expand multi-functional electrohydraulic system and working method |
| CN108953308B (en) * | 2018-09-12 | 2024-01-30 | 徐州徐工基础工程机械有限公司 | Extensible multifunctional electrohydraulic system and working method |
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| Publication number | Publication date |
|---|---|
| CN106194881B (en) | 2019-01-25 |
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