CN109764014A - A kind of support leg hydraulic system and engineering machinery - Google Patents

A kind of support leg hydraulic system and engineering machinery Download PDF

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Publication number
CN109764014A
CN109764014A CN201810191670.4A CN201810191670A CN109764014A CN 109764014 A CN109764014 A CN 109764014A CN 201810191670 A CN201810191670 A CN 201810191670A CN 109764014 A CN109764014 A CN 109764014A
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CN
China
Prior art keywords
valve
hydraulic
control
support leg
directional control
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810191670.4A
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Chinese (zh)
Inventor
冉光宇
陈念
刘坤
陈兆勇
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GUIZHOU JONYANG KINETICS CO Ltd
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GUIZHOU JONYANG KINETICS CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to CN201810191670.4A priority Critical patent/CN109764014A/en
Publication of CN109764014A publication Critical patent/CN109764014A/en
Pending legal-status Critical Current

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Abstract

The present invention relates to a kind of support leg hydraulic systems, for controlling the flexible of supporting leg, main valve including main pump and with the main pump piping connection, further include: two and more than two hydraulic cylinders for being used to respectively drive the landing leg stretching, the rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port of each hydraulic cylinder access two actuator ports of the main valve by pipeline correspondingly respectively;On pipeline between each hydraulic cylinder and the main valve, the on-off of the working oil path of the rod chamber of the corresponding hydraulic cylinder can be controlled respectively by accessing a separately controllable switching valve by controlling each switching valve respectively.It by the system, may be implemented freely to control the flexible of each supporting leg, and then the engineering machinery such as wheel excavator can be allow not limited by road surface by the system, adaptability is stronger.The invention further relates to a kind of engineering machinery including above-mentioned support leg hydraulic system.

Description

A kind of support leg hydraulic system and engineering machinery
Technical field
Embodiment disclosed by the invention is related to engineering machinery field more particularly to a kind of support leg hydraulic system and engineering machine Tool.
Background technique
In engineering machinery field, many equipment require to use auxiliary leg, by taking wheel excavator as an example, due to its operation When can generate biggish excavation counter-force, make the running gears stress such as tire, vehicle bridge very big in this way, this not only influences running gear Mechanical strength, and the deformation of tire can make job insecurity, and horizontal reacting force is very big, leads to excavator play forward.In order to make Function steady operation is excavated, and makes wheel shaft off-load, is usually all equipped with hydraulic leg in vehicle frame two sides.Crane for another example, in order to The stabilization of car body when mitigating the stress of tire and keeping operation, also it is generally necessary to which supporting leg is arranged in surrounding.This supporting leg is in vehicle It is packed up when walking, when operation puts down, and is rigidly supported at excavator on ground.Currently, most of wheel excavators or rise Heavy-duty machine all uses four telescopic outriggers, is controlled with a set of hydraulic system, and when operation controls it while stretching out, and operation finishes, It is controlled again while being packed up.
Although this supporting leg is able to solve the problem of support force of car body, but it is to the more demanding of ground, it is necessary to ground Face is smooth to be enabled, and when such as encountering narrow, tilted road surface, then can not carry out operation.
For this purpose, how to improve the adaptability of the engineering machinery vehicle as wheel excavator etc, become art technology The technical issues of personnel's urgent need to resolve.
Summary of the invention
An object of the present invention is to provide a kind of support leg hydraulic system, by the system, may be implemented to each supporting leg It is flexible freely control, and then the engineering machinery such as wheel excavator can be allow not limited by road surface by the system, Adaptability is stronger.
It is a further object of the present invention to provide a kind of engineering machinery with supporting leg, which includes above-mentioned one kind Support leg hydraulic system, due to having used the support leg hydraulic system, so the adaptability of the engineering machinery will greatly improve, not by The limitation on road surface.
The present invention is achieved through the following technical solutions.
A kind of support leg hydraulic system, the master for controlling the flexible of supporting leg, including main pump and with the main pump piping connection Valve, further includes:
Two and more than two hydraulic cylinders for being used to respectively drive the landing leg stretching, the rod chamber of each hydraulic cylinder Hydraulic fluid port and rodless cavity hydraulic fluid port access two actuator ports of the main valve by pipeline correspondingly respectively;
On pipeline between each hydraulic cylinder and the main valve, a separately controllable switching valve is accessed, By controlling each switching valve respectively, the working oil path of the rod chamber of the corresponding hydraulic cylinder can be controlled respectively On-off.
Preferably, the switching valve is the automatically controlled on-off valve of 2/2-way, accesses the access tube of the rod chamber of the hydraulic cylinder On the road.
Preferably, the switching valve is 2/2-way hydraulic control on-off valve open in usual, accesses the rod chamber of the hydraulic cylinder Access tube road.
Preferably, the support leg hydraulic system further includes servopump, solenoid directional control valve and electronic control unit,
The quantity of the solenoid directional control valve is equal with the quantity of the hydraulic control on-off valve, and each hydraulic control on-off valve is logical The solenoid directional control valve is crossed to connect with the servopump;
The electronic control unit and each solenoid directional control valve circuit connection, for controlling each electromagnetic switch Vavle switching working position, and then control the oil circuit on-off between the servopump and each 2/2-way hydraulic control on-off valve.
Preferably, the solenoid directional control valve be two-position three way magnetic valve, when its be in electricity condition when, the servopump with Oil circuit is connected between the hydraulic control on-off valve, when it is in power failure state, between the servopump and the hydraulic control on-off valve Oil circuit disconnects.
Preferably, the switching valve is two position and four-way reversing valves, and two of them hydraulic fluid port is respectively connected to the work of the main valve Hydraulic fluid port, other two hydraulic fluid port are respectively connected to the rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port of the hydraulic cylinder;
When first working position of two position and four-way reversing valve is connected, the rod chamber and rodless cavity of the hydraulic cylinder with it is described Oil circuit between two actuator ports of main valve is turned on;When second working position is connected, between the hydraulic cylinder and the main valve Rodless cavity oil circuit connect, rod chamber oil circuit disconnect.
Preferably, two position and four-way reversing valve is pilot operated directional control valve, when hydraulic control end enters without hydraulic oil, described two Four-way reversing valve is in the first working position state, when hydraulic control end has hydraulic oil to enter, at the two-position four way change valve In the second working position state.
Preferably, the support leg hydraulic system further includes servopump, solenoid directional control valve and electronic control unit,
The quantity of the solenoid directional control valve is equal with the quantity of the pilot operated directional control valve, and each pilot operated directional control valve is logical The solenoid directional control valve is crossed to connect with the servopump;
The electronic control unit and each solenoid directional control valve circuit connection, for controlling each electromagnetic switch Vavle switching working position, and then control the oil circuit on-off between the servopump and each pilot operated directional control valve.
Preferably, the solenoid directional control valve be two-position three way magnetic valve, when its be in electricity condition when, the servopump with Oil circuit is connected between the pilot operated directional control valve, when it is in power failure state, between the servopump and the pilot operated directional control valve Oil circuit disconnects.
Preferably, there are four the hydraulic cylinders, the supporting leg is respectively driven,
The electronic control unit is set there are four control button, each button one supporting leg of corresponding control, when pressing When one of them described button, control the corresponding solenoid directional control valve of its excess-three hydraulic cylinder obtain it is electric.
Preferably, hydraulic lock is equipped between each hydraulic cylinder and the switching valve.
It further include a kind of support leg hydraulic system as described above the present invention also provides a kind of engineering machinery, including supporting leg.
Detailed description of the invention
Fig. 1 is a kind of support leg hydraulic system schematic diagram of embodiment disclosed by the invention.
Figure label indicates are as follows: 1, main pump, 2, main valve, and 3, center-rotary joint, the 4, first oil cylinder, the 5, second oil cylinder, 6, Third oil cylinder, the 7, the 4th oil cylinder, the 8, first switching valve, the 9, second switching valve, 10, third switching valve, the 11, the 4th switching valve, 12, Hydraulic lock, 13, servopump, 14, electronic control unit, 8a, the first solenoid valve, 9a, second solenoid valve, 10a, third solenoid valve, 11a, the 4th solenoid valve.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and It is non-to be used to limit the scope of the invention.
Embodiment one:
Fig. 1 is please referred to, is a kind of support leg hydraulic system schematic diagram of embodiment disclosed by the invention.
In a kind of embodiment of support leg hydraulic system disclosed by the invention, it can be used for excavator, as shown in Figure 1, packet Include main pump 1, main valve 2 and four drive cylinders, wherein main valve 2 is three eight electric change valves (or 3-position 4-way Or three six logical, as needed depending on, be not intended to limit the present invention), four drive cylinders are respectively the first oil cylinder 4, second Oil cylinder 5, third oil cylinder 6 and the 4th oil cylinder 7, four oil cylinders can respectively drive a supporting leg and stretch.
After oil cylinder driving supporting leg stretches out, needs to carry out it pressure maintaining with locked cylinder position, be also equipped on pipeline Hydraulic lock 12 respectively installs a hydraulic lock 12 on the working connection of four oil cylinders.Bidirectional hydraulic lock 12 on excavator is exactly two A hydraulic control one-way valve is simultaneously linked up using pressure maintaining and locked cylinder position is played the role of, and makes supporting leg will not be because of other reasons certainly It is dynamic to skid off.
Since chassis of dredging machine needs to do opposite rotary motion, hydraulic oil when in order to guarantee to do rotary motion with portion of upper body The supply on road.It needs to install center-rotary joint 3 additional on pipeline, in this way, passing through central joint when excavator revolution movement Hydraulic oil is conveyed to four oil cylinders.
It is connected with the first switching valve 8 between main valve 2 and the first oil cylinder 4, is connected with second between main valve 2 and the second oil cylinder 5 Switching valve 9 is connected with third switching valve 10 between main valve 2 and third oil cylinder 6, between main valve 2 and the 4th oil cylinder 7 there are four connections Switching valve;Four switching valves are two-position four-way pilot operated directional control valve, and two of them hydraulic fluid port is respectively connected to the working oil of the main valve 2 Mouthful, other two hydraulic fluid port is respectively connected to the rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port of the hydraulic cylinder;Two position and four-way reversing valve The first working position connect when, between the rod chamber and rodless cavity of the hydraulic cylinder and two actuator ports of the main valve 2 Oil circuit is turned on;When second working position is connected, the rodless cavity oil circuit between the hydraulic cylinder and the main valve 2 is connected, rod chamber Oil circuit disconnects.
Specifically, when the hydraulic control end of four switching valves enters without hydraulic oil, the two-position four way change valve is in described First working position state, when hydraulic control end has hydraulic oil to enter, the two-position four way change valve is in the second working position shape State.
It should be noted that four switching valves can also use electromagnetic switch, but engineering machinery this kind of for excavator is come It says, pipeline oil pressure is higher, and in case of high pressures, the electromagnetic force needed with electromagnetic switch is very big, and cost is also very high, safety Property, that stability is all not so good as hydraulic control is more excellent.
It further include four solenoid valves, servopump 13 and electronic control unit to realize free control in the present embodiment 14, four solenoid valves are respectively the first solenoid valve 8a, second solenoid valve 9a, third solenoid valve 10a and the 4th solenoid valve 11a, and four A solenoid valve is corresponding with four hydraulic control switching valves i.e. the first switching valve 8, the second switching valve 9, third switching valve 10 and the Four switching valves, 11 oil circuit connects, to realize function of hydraulic control, four solenoid valves with the piping connection in parallel of servopump 13. In addition, four solenoid valves also respectively with 14 circuit connection of electronic control unit, by electronic control unit 14 to four solenoid valves into Its commutation of row Electromagnetic Control.
The electronic control unit 14 is set there are four control button for operating easily, and each button is corresponding to control one The supporting leg, when pressing one of them described button, control the corresponding solenoid directional control valve of its excess-three hydraulic cylinder obtain it is electric.
Support leg hydraulic system in through this embodiment, control principle are as follows.
It controls simultaneously:
Hydraulic oil from main pump 1 enters the first switching valve 8, the second switching valve 9, the through main valve 2, center-rotary joint 3 Three switching valves 10 and the 4th switching valve 11, electronic control unit 14 controls the first solenoid valve 8a, second solenoid valve 9a, third at this time Solenoid valve 10a and the 4th solenoid valve 11a do not work, namely do not give its energization, and high pressure oil enters four switching valves simultaneously at this time, leads to The commutation for crossing main valve 2 can be realized while control four landing leg stretchings.
Individually control:
In order to clearly describe the problem, the first oil cylinder 4, the second oil cylinder 5, third oil cylinder 6 and the 4th oil cylinder 7 are driven Supporting leg be respectively defined as it is left front, right before, it is right after, left back supporting leg.
(1) left front supporting leg control
It operates supporting leg and controls handle, when pressing left front supporting leg control button, pass through the control of electronic control unit 14 second Solenoid valve 9a, third solenoid valve 10a, the 4th solenoid valve 11a must be electrically connected, and make its commutation, the control at this time from servopump 13 Oil respectively enters the hydraulic control mouth of the second switching valve 9, third switching valve 10, the 4th switching valve 11, and is commutated, cut off it is left back, Before the right side, it is right after working connection, operating supporting leg control handle at this time can be controlled separately left front landing leg stretching.
(2) right anterior branch leg controls
It operates supporting leg and controls handle, when pressing right anterior branch leg control button, pass through the control of electronic control unit 14 first Solenoid valve 8a, third solenoid valve 10a, the 4th solenoid valve 11a must be electrically connected, and make its commutation, the control at this time from servopump 13 Oil respectively enters the hydraulic control mouth of the first switching valve 8, third switching valve 10, the 4th switching valve 11, and is commutated, cut off it is left front, Working connection after left back, right, it is flexible to can be controlled separately right anterior branch leg for operation supporting leg control handle at this time.
(3) left back supporting leg control
It operates supporting leg and controls handle, when pressing left back supporting leg control button, pass through the control of electronic control unit 14 first Solenoid valve 8a, second solenoid valve 9a, third solenoid valve 10a must be electrically connected, and make its commutation, at this time the control oil from servopump 13 The hydraulic control mouth of the first switching valve 8, the second switching valve 9, third switching valve 10 is respectively enterd, and is commutated, is cut off left front, right Before, it is right after working connection, operating supporting leg control handle at this time can be controlled separately left back landing leg stretching.
(4) right rear support leg control
It operates supporting leg and controls handle, when pressing lower right rear support leg control button, pass through the control of electronic control unit 14 first Solenoid valve 8a, second solenoid valve 9a, the 4th solenoid valve 11a must be electrically connected, and make its commutation, at this time the control oil from servopump 13 The hydraulic control mouth of the first switching valve 8, the second switching valve 9, the 4th switching valve 11 is respectively enterd, and is commutated, is cut off left front, left Afterwards, working connection before the right side, it is flexible to can be controlled separately right rear support leg for operation supporting leg control handle at this time.
Embodiment two
The present embodiment is that four switching valves are bi-bit bi-pass on-off valve open in usual, Ke Yiwei with the difference of embodiment one Solenoid valve, or four on-off valves are respectively connected to the working connection of four oil cylinders, preferably connect by pilot operated valve device, preferably pilot operated valve device On the rod chamber working connection for entering four oil cylinders, rodless cavity working connection, which is directly accessed, accesses main valve 2 by center-rotary joint 3, Remaining component is constant.
In the present embodiment, control principle is similar with embodiment one, and details are not described herein.
It should be noted that above-mentioned specific embodiment is the principle description carried out with the hydraulic system of four supporting legs, benefit Number with the principle of the present invention, supporting leg is unrestricted, as needed, can be two and more than two any amounts.
Through the foregoing embodiment, support leg hydraulic system provided by the present invention can not only control all supporting legs simultaneously and stretch Contracting, and can individually control each supporting leg and stretch, propose a kind of completely new hydraulic control thinking -- combination control mould Formula.By the system, solve the problems, such as the narrow of the engineering machinery as excavator etc, tilted road surface can not operation, i.e., just It is controlled and is stretched simultaneously using four supporting legs under normal operating environment, using the unified unilateral control mode of oil circuit under special operation environment, made The adaptability for obtaining engineering machinery greatly improves.
In addition, the engineering machinery is not limited to excavator, crane the present invention also provides a kind of engineering machinery, further include Other any required engineering trucks that less important work is carried out using supporting leg in engineering machinery provided by the invention, are used above-mentioned Any one support leg hydraulic system, since the advantageous effects that above-mentioned support leg hydraulic system has have illustrated, again for The beneficial effect of the engineering machinery is not repeated.
In the description of the present invention, it is to be understood that, term " on ", "lower", "front", "rear", "left", "right", " perpendicular Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" "inner", "outside", " circumferential direction " is side based on the figure Position or positional relationship, are merely for convenience of description of the present invention and simplification of the description, rather than the device or member of indication or suggestion meaning Part must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc. Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral;It can be mechanical connect It connects, is also possible to be electrically connected;It can be directly connected, can also can be in two elements indirectly connected through an intermediary The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned Embodiment is changed, modifies, replacement and variant.

Claims (10)

1. a kind of support leg hydraulic system, for controlling the flexible of supporting leg, main valve including main pump and with the main pump piping connection, It is characterized by further comprising:
Two and more than two hydraulic cylinders for being used to respectively drive the landing leg stretching, the rod chamber hydraulic fluid port of each hydraulic cylinder Access two actuator ports of the main valve correspondingly respectively by pipeline with rodless cavity hydraulic fluid port;
On pipeline between each hydraulic cylinder and the main valve, a separately controllable switching valve is accessed, is passed through Each switching valve is controlled respectively, can control the logical of the working oil path of the rod chamber of the corresponding hydraulic cylinder respectively It is disconnected.
2. a kind of support leg hydraulic system according to claim 1, which is characterized in that the switching valve is that 2/2-way is automatically controlled On-off valve accesses the access tube road of the rod chamber of the hydraulic cylinder.
3. a kind of support leg hydraulic system according to claim 1, which is characterized in that the switching valve is two two open in usual Logical hydraulic control on-off valve accesses the access tube road of the rod chamber of the hydraulic cylinder.
4. a kind of support leg hydraulic system according to claim 3, which is characterized in that the support leg hydraulic system further includes watching Clothes pump, solenoid directional control valve and electronic control unit,
The quantity of the solenoid directional control valve is equal with the quantity of the hydraulic control on-off valve, and each hydraulic control on-off valve passes through one A solenoid directional control valve is connect with the servopump;
The electronic control unit and each solenoid directional control valve circuit connection, cut for controlling each solenoid directional control valve Change jobs position, and then controls the oil circuit on-off between the servopump and each 2/2-way hydraulic control on-off valve.
5. a kind of support leg hydraulic system according to claim 4, which is characterized in that the solenoid directional control valve is two-position three way Solenoid valve, when its be in electricity condition when, oil circuit is connected between the servopump and the hydraulic control on-off valve, when it is in power loss When state, oil circuit is disconnected between the servopump and the hydraulic control on-off valve.
6. a kind of support leg hydraulic system according to claim 1, which is characterized in that the switching valve is two four-way commutations Valve, two of them hydraulic fluid port are respectively connected to the actuator port of the main valve, other two hydraulic fluid port is respectively connected to having for the hydraulic cylinder Rod cavity hydraulic fluid port and rodless cavity hydraulic fluid port;
When first working position of two position and four-way reversing valve is connected, the rod chamber and rodless cavity and the main valve of the hydraulic cylinder Two actuator ports between oil circuit be turned on;When second working position is connected, the nothing between the hydraulic cylinder and the main valve Rod cavity oil circuit is connected, and rod chamber oil circuit disconnects.
7. a kind of support leg hydraulic system according to claim 6, which is characterized in that two position and four-way reversing valve is hydraulic control Reversal valve, when hydraulic control end enters without hydraulic oil, the two-position four way change valve is in the first working position state, works as hydraulic control When end has hydraulic oil to enter, the two-position four way change valve is in the second working position state.
8. a kind of support leg hydraulic system according to claim 7, which is characterized in that the support leg hydraulic system further includes watching Clothes pump, solenoid directional control valve and electronic control unit,
The quantity of the solenoid directional control valve is equal with the quantity of the pilot operated directional control valve, and each pilot operated directional control valve passes through one A solenoid directional control valve is connect with the servopump;
The electronic control unit and each solenoid directional control valve circuit connection, cut for controlling each solenoid directional control valve Change jobs position, and then controls the oil circuit on-off between the servopump and each pilot operated directional control valve;
The solenoid directional control valve be two-position three way magnetic valve, when its be in electricity condition when, the servopump is changed with the hydraulic control It is connected to oil circuit between valve, when it is in power failure state, oil circuit is disconnected between the servopump and the pilot operated directional control valve.
9. a kind of support leg hydraulic system according to claim 5 or 8, which is characterized in that there are four the hydraulic cylinders, respectively A supporting leg is driven,
The electronic control unit is set there are four control button, each button one supporting leg of corresponding control, when pressing wherein When one button, control the corresponding solenoid directional control valve of its excess-three hydraulic cylinder obtain it is electric;Each hydraulic cylinder and institute It states and is equipped with hydraulic lock between switching valve.
10. a kind of engineering machinery, including supporting leg, which is characterized in that further include one kind as described in any one of claim 1 to 9 Support leg hydraulic system.
CN201810191670.4A 2018-03-08 2018-03-08 A kind of support leg hydraulic system and engineering machinery Pending CN109764014A (en)

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Application Number Priority Date Filing Date Title
CN201810191670.4A CN109764014A (en) 2018-03-08 2018-03-08 A kind of support leg hydraulic system and engineering machinery

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Application Number Priority Date Filing Date Title
CN201810191670.4A CN109764014A (en) 2018-03-08 2018-03-08 A kind of support leg hydraulic system and engineering machinery

Publications (1)

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CN109764014A true CN109764014A (en) 2019-05-17

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5640850A (en) * 1993-09-07 1997-06-24 Putzmeister-Werk Maschinenfabrik Gmbh Hydraulic pressure supply and control device for a mobile concrete pump
JPH1081490A (en) * 1996-09-05 1998-03-31 Daikin Ind Ltd Control device for on-vehicle crane
CN1717547A (en) * 2002-12-27 2006-01-04 日立建机株式会社 Drive device of hydraulic cylinder for working
DE102008053061A1 (en) * 2008-10-24 2010-04-29 Hydac System Gmbh Hydromechanical support device, particularly for holding working platforms erected on floor space in desired alignment position, comprises hydraulic system which has preselection valve which is upstream hydraulic cylinders
CN102996553A (en) * 2012-11-27 2013-03-27 三一重工股份有限公司 Support leg hydraulic system and engineering machinery
CN203655744U (en) * 2013-06-05 2014-06-18 胜利油田胜利动力机械集团有限公司 Hydraulic transmission device of mobile ground anchor vehicle
CN205207302U (en) * 2015-10-30 2016-05-04 长安大学 Adjusting device is assisted to hydraulic leg

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5640850A (en) * 1993-09-07 1997-06-24 Putzmeister-Werk Maschinenfabrik Gmbh Hydraulic pressure supply and control device for a mobile concrete pump
JPH1081490A (en) * 1996-09-05 1998-03-31 Daikin Ind Ltd Control device for on-vehicle crane
CN1717547A (en) * 2002-12-27 2006-01-04 日立建机株式会社 Drive device of hydraulic cylinder for working
DE102008053061A1 (en) * 2008-10-24 2010-04-29 Hydac System Gmbh Hydromechanical support device, particularly for holding working platforms erected on floor space in desired alignment position, comprises hydraulic system which has preselection valve which is upstream hydraulic cylinders
CN102996553A (en) * 2012-11-27 2013-03-27 三一重工股份有限公司 Support leg hydraulic system and engineering machinery
CN203655744U (en) * 2013-06-05 2014-06-18 胜利油田胜利动力机械集团有限公司 Hydraulic transmission device of mobile ground anchor vehicle
CN205207302U (en) * 2015-10-30 2016-05-04 长安大学 Adjusting device is assisted to hydraulic leg

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