CN107191421A - A kind of lifter control device - Google Patents
A kind of lifter control device Download PDFInfo
- Publication number
- CN107191421A CN107191421A CN201710541421.9A CN201710541421A CN107191421A CN 107191421 A CN107191421 A CN 107191421A CN 201710541421 A CN201710541421 A CN 201710541421A CN 107191421 A CN107191421 A CN 107191421A
- Authority
- CN
- China
- Prior art keywords
- valve
- hydraulic fluid
- fluid port
- reversal valve
- reversal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/862—Control during or prevention of abnormal conditions the abnormal condition being electric or electronic failure
- F15B2211/8626—Electronic controller failure, e.g. software, EMV, electromagnetic interference
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/895—Manual override
Abstract
The invention discloses a kind of lifter control device, including oil absorption filter, gear pump, high-pressure filter, hydraulic pressure output valve group, automatically controlled valve group, oil circuit switching valve, controlling organization and lifting column plug cylinder；Oil circuit switching valve includes the first reversal valve and the second reversal valve, and is mechanical valve；Wherein, oil absorption filter, gear pump, high-pressure filter and hydraulic pressure output valve group, the first reversal valve, automatically controlled valve group and the second reversal valve are sequentially connected；And automatically controlled valve group is connected by another hydraulic fluid port with the second reversal valve.Under first predetermined operating mode, fluid successively enters automatically controlled valve group after hydraulic pressure output valve group export via the first reversal valve, and controlling organization controls automatically controlled valve group by the second reversal valve to liftout plunger oil supply cylinder；Under second predetermined operating mode, fluid is passed through from the second reversal valve to liftout plunger oil supply cylinder after hydraulic pressure output valve group export.When the automatically controlled mode failures even of lifter, it is possible to achieve the switching of automatically controlled pattern and manual mode.
Description
Technical field
The present invention relates to agricultural machinery technological field, a kind of especially lifter control device.
Background technology
Lifter is the hydraulic means for being used to be lifted on tractor, and its principle is to lean on the oily liquid pressure produced to be lifted.
Automatically controlled lifter is to apply lifter type the most typical at this stage, and it possesses, and manipulation is accurate, driver's operation is comfortable, can lead
The advantages of dynamic damping.But some shortcomings are also exposed during practical application, after automatically controlled lifter breaks down, maintenance difficulty is general
It can not usually be excluded in time than larger, failure, if lifter relies only on automatically controlled Schema control, each electric control structure occurs
It can all cause complete machine can not carry out normal operation during failure, downtime is long, extremely influences operating efficiency.
The content of the invention
It is an object of the invention to provide a kind of lifter control device, when the automatically controlled mode failures even of lifter, it is possible to achieve
The switching of automatically controlled pattern and manual mode.
The technical scheme that the present invention is provided is as follows：A kind of lifter control device, including oil absorption filter, gear pump, height
Filter pressed oil device, hydraulic pressure output valve group, automatically controlled valve group, oil circuit switching valve, controlling organization and lifting column plug cylinder；The oil circuit conversion
Valve includes the first reversal valve and the second reversal valve, and is mechanical valve；
Wherein, the oil absorption filter, the gear pump, the high-pressure filter and hydraulic pressure output valve group, institute
The first reversal valve, the automatically controlled valve group and second reversal valve is stated to be sequentially connected；And the automatically controlled valve group passes through another
Hydraulic fluid port is connected with second reversal valve；
Under first predetermined operating mode, fluid is after hydraulic pressure output valve group export successively via first reversal valve, institute
Automatically controlled valve group and second reversal valve are stated to the liftout plunger oil supply cylinder；
Under second predetermined operating mode, fluid is passed through from second reversal valve to described after hydraulic pressure output valve group export
Liftout plunger oil supply cylinder.
The technical program, designs two oil circuits, and an oil circuit passes through automatically controlled valve group, a set of machine of Parallel Design on the oil circuit
Hydraulic pressure delivery valve, is directly connected to and without automatically controlled by tool actuation means by mechanical structure of reversing valve with lifting column plug cylinder
Valve group.So realize the conversion of automatically controlled same armstrong's patent manipulation.Mechanical course can be changed into automatically controlled failure so that
Still loss can be reduced with normal operation during automatically controlled failure, accelerate operating efficiency.
It is preferred that, first reversal valve drives synchronization action, described first with second reversal valve by same valve rod
Reversal valve is provided with least three hydraulic fluid ports, and respectively the first hydraulic fluid port, the second hydraulic fluid port and the 3rd hydraulic fluid port, second reversal valve are provided with
At least three hydraulic fluid ports, respectively the 4th hydraulic fluid port, the 5th hydraulic fluid port and the 6th hydraulic fluid port；
Wherein, the hydraulic pressure delivery valve at least includes the first valve block, two valve blocks of the second valve block, and the first valve block is by hand
Handle drive actions；One hydraulic fluid port of the first valve block is connected with the first hydraulic fluid port of first reversal valve, the first valve block
Another hydraulic fluid port be connected with the 4th hydraulic fluid port of second reversal valve, the second oil of the automatically controlled valve group and first reversal valve
5th hydraulic fluid port of mouth and second reversal valve is connected respectively, the 6th hydraulic fluid port and the liftout plunger of second reversal valve
Cylinder is connected；3rd hydraulic fluid port is connected with oil return with hydraulic pressure output valve group；
Under first predetermined state, the first reversal valve described in valve rod action drives and the described second commutation valve events, described the
One hydraulic fluid port is turned on second hydraulic fluid port, and the 5th hydraulic fluid port is turned on the 6th hydraulic fluid port；Act on the handle make fluid from
The first valve block enters first hydraulic fluid port；
Under second predetermined state, the first reversal valve described in valve rod action drives and the described second commutation valve events, described the
One hydraulic fluid port is turned on the 3rd hydraulic fluid port, and the 4th hydraulic fluid port is turned on the 6th hydraulic fluid port；Act on the handle make fluid from
The first valve block enters the 4th hydraulic fluid port.
The technical program, valve rod adjusts the first reversal valve simultaneously and the action of the second reversal valve completes automatically controlled and Mechanical course
Switching, and two hydraulic fluid ports of one valve block of hydraulic pressure delivery valve are corresponded into parallel electrically-controlled oilway respectively and Mechanical course oil circuit connects
Connect, adjusting oil-out by the handle on the valve block causes fluid to flow to electrically-controlled oilway or Mechanical course oil circuit.First commutation
It should carry out simultaneously that the conversion on oil circuit is turned on valve and the second reversal valve, so regulate and control two by a valve rod
Valve body.
Specifically, the first valve block is connected by quick-release connector with the 4th interface of second reversal valve.
Specifically, the hydraulic pressure output valve group is circumscribed with some two-way cylinders for its fuel feeding.The two-way cylinder can be with
Drive the equipment being attached thereto.
Specifically, first reversal valve and second reversal valve are two-way triple valve.
A kind of lifter control device that the present invention is provided, can bring following at least one beneficial effect：
1st, with reference to the parallel principle of oil circuit, retain the electrically-controlled oilway of original lifter, and valve group and plunger case are exported in hydraulic pressure
Between a parallel Mechanical course oil circuit, when automatically controlled failure, switching to Mechanical course oil circuit makes whole device be changed into manually
Mechanical manipulation, can be achieved the general control operation of lifter.
2nd, the time that user is shut down due to the automatically controlled failure of lifter is reduced.
Brief description of the drawings
Below by clearly understandable mode, preferred embodiment is described with reference to the drawings, to a kind of lifter control of the invention
Above-mentioned characteristic, technical characteristic, advantage and its implementation of device processed are further described.
Fig. 1 is the systematic schematic diagram of lifter control device.
Drawing reference numeral explanation：1st, oil absorption filter, 2, gear pump, 3, high-pressure filter, 4, automatically controlled valve group, 5, hydraulic pressure output
Valve group, 6, quick-release connector, 7, two-way cylinder, 8, lifting system plunger case, 9, oil circuit switching valve, the 91, first reversal valve, 92,
Second reversal valve, 93, valve rod；
B, the first hydraulic fluid port, P, the second hydraulic fluid port, T, the 3rd hydraulic fluid port, a, the 4th hydraulic fluid port, P2, the 5th hydraulic fluid port P1, the 6th hydraulic fluid port.
Embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, control is illustrated below
The embodiment of the present invention.It should be evident that drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing, and obtain other embodiments.
To make only to schematically show part related to the present invention in simplified form, each figure, their not generations
Table its as product practical structures.
This example discloses a kind of lifter control device, including oil absorption filter 1, gear pump 2, high-pressure filter 3, liquid
Pressure output valve group 5, automatically controlled valve group 4 and oil circuit switching valve 9 and lifting column plug cylinder 8；
Oil circuit switching valve 9 includes the first reversal valve 91 and the second reversal valve 92, is two-way triple valve, the first reversal valve 91
Including the first hydraulic fluid port b, the second hydraulic fluid port P and the 3rd hydraulic fluid port T, the second reversal valve 92 is provided with least three hydraulic fluid ports, the respectively the 4th
Hydraulic fluid port a, the 5th hydraulic fluid port P2 and the 6th hydraulic fluid port P1.Hydraulic pressure output valve group includes three valves block 5a, 5b, 5c, is that three tunnels six lead to
Valve.First reversal valve 91 is controlled with the second reversal valve 92 by a valve rod 93, and action is synchronous.Exemplary, the first reversal valve
91 and second reversal valve 92 be preferably ball valve.
Automatically controlled valve group 4 is connected with the second hydraulic fluid port P and the 5th hydraulic fluid port P2, and the 6th hydraulic fluid port P1 is connected with lifting column plug cylinder 8.
The high-voltage oil liquid that fluid is produced by oil absorption filter 1, gear pump 2, enters hydraulic pressure by high-pressure filter 3 and exports
Valve group 9, the middle hydraulic fluid port of the 5a valve blocks of hydraulic pressure output valve group 9 is connected with the first hydraulic fluid port b, and another hydraulic fluid port B3 passes through quick-release connector 6
It is connected with the 4th hydraulic fluid port a.
When oil circuit switching valve 9, which is in, illustrates right position, the first hydraulic fluid port b and the second hydraulic fluid port P are turned on, the 5th hydraulic fluid port P2 and the 6th
Hydraulic fluid port P1 is turned on.Now hydraulic pressure output valve group 5 is in diagram middle position, and high-voltage oil liquid manipulates automatically controlled carry via valve block 5a, 5b, 5c
Rise device controlling organization, first hydraulic fluid port b and second hydraulic fluid port P of the high-voltage oil liquid from middle the first reversal valve of hydraulic fluid port approach 91 of 5a valve blocks
Into automatically controlled valve group 4, now by controlling organization can make high-voltage oil liquid from automatically controlled valve group 4 the second reversal valve of approach 92 the 5th
Hydraulic fluid port P2 and the 6th hydraulic fluid port P1, force feed or oil return lifting column plug cylinder 8, realize the lifting or decline of lifter.Now lifter
Control device is in automatically controlled pattern.
And when oil circuit conversion 9 is in left position, the first hydraulic fluid port b and the 3rd hydraulic fluid port T are turned on, the 4th hydraulic fluid port a and the 6th hydraulic fluid port
P1 is turned on.Now high-voltage oil liquid exports middle position approach the first hydraulic fluid port b of valve group 5 and the 3rd hydraulic fluid port T oil returns, hydraulic pressure output via hydraulic pressure
Valve group 5 is neutral oil return state.The double acting of 5a valve blocks is changed to single-acting, the second reversal valve is connected to by quick-release connector 6
92 the 4th hydraulic fluid port a, the handle of manipulation 5a valve blocks changes 5a valves bulk state into left position or right position, can make high-voltage oil liquid approach 5a valves
The B3 mouths of block flow through the 4th hydraulic fluid port a and the 6th hydraulic fluid port P1 of the second reversal valve 92, force feed or oil return lifting column plug cylinder 8, and realization is carried
Rise the lifting or decline of device.Fluid is not flow through automatically controlled valve group 4 under this state, and lifter control device is in manual mode.
Study carefully the technical concept essence of this embodiment, be to make original oil circuit of the automatically controlled pattern of lifter constant, and by liquid
Pressure output oil inlet is with being connected in parallel an oil circuit at plunger cylinder, by oil circuit switching valve converting parallel oil circuit, and causes electricity
The oil circuit of control pattern is different and fails.It is manually operated, the working condition of hydraulic pressure delivery valve will be changed, one hydraulic fluid port is turned
It is connected to another oil circuit of oil circuit switching valve and then is connected to plunger cylinder, realizes manually operated lifter lifting.Oil circuit switching valve
Can type selecting Electromagnetic Control, handling good by the progress oil circuit conversion of automatically controlled button, cost height.Oil circuit switching valve can be with electrically-controlled valve
Or hydraulic pressure output valve group is integrated, i.e., automatically controlled valve group or hydraulic pressure output valve group carry oil circuit translation function, compact conformation, pipeline letter
Single, handling good, automatically controlled valve group or hydraulic pressure output valve block structure need to be researched and developed again.So it should be noted that it is described above only
It is the preferred embodiment of the present invention, the connected mode of parallel oil circuit and the type selecting of oil circuit switching valve are not limited to this implementation
Example.
It should be noted that above-described embodiment can independent assortment as needed.It should be pointed out that for the art
For those of ordinary skill, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvement
Protection scope of the present invention is also should be regarded as with retouching.
Claims (6)
1. a kind of lifter control device, it is characterised in that including oil absorption filter, gear pump, high-pressure filter, hydraulic pressure output
Valve group, automatically controlled valve group, oil circuit switching valve, controlling organization and lifting column plug cylinder；The oil circuit switching valve includes the first reversal valve
And it is mechanical valve with the second reversal valve；
Wherein, the oil absorption filter, the gear pump, the high-pressure filter and hydraulic pressure output valve group, described the
One reversal valve, the automatically controlled valve group and second reversal valve are sequentially connected；And the automatically controlled valve group passes through another hydraulic fluid port
It is connected with second reversal valve；
Under first predetermined operating mode, fluid successively enters described after hydraulic pressure output valve group export via first reversal valve
Automatically controlled valve group, the controlling organization controls the automatically controlled valve group by second reversal valve to the liftout plunger oil supply cylinder；
Under second predetermined operating mode, fluid is passed through from second reversal valve to the lifting column after hydraulic pressure output valve group export
Plug cylinder fuel feeding.
2. lifter control device according to claim 1, it is characterised in that first reversal valve is changed with described second
Synchronization action is driven by same valve rod to valve, first reversal valve is provided with least three hydraulic fluid ports, respectively the first hydraulic fluid port, second
Hydraulic fluid port and the 3rd hydraulic fluid port, second reversal valve are provided with least three hydraulic fluid ports, respectively the 4th hydraulic fluid port, the 5th hydraulic fluid port and the
Six hydraulic fluid ports；
Wherein, the hydraulic pressure delivery valve at least includes the first valve block, two valve blocks of the second valve block, and the first valve block is driven by handle
Action；One hydraulic fluid port of the first valve block is connected with the first hydraulic fluid port of first reversal valve, the first valve block it is another
One hydraulic fluid port is connected with the 4th hydraulic fluid port of second reversal valve, the second hydraulic fluid port of the automatically controlled valve group and first reversal valve with
And the 5th hydraulic fluid port of second reversal valve is connected respectively, the 6th hydraulic fluid port and the lifting column plug cylinder of second reversal valve connect
Connect；3rd hydraulic fluid port is connected with oil return with hydraulic pressure output valve group；
Under first predetermined state, the first reversal valve described in valve rod action drives and the described second commutation valve events, first oil
Mouth is turned on second hydraulic fluid port, and the 5th hydraulic fluid port is turned on the 6th hydraulic fluid port；Acting on the handle makes fluid from described
First valve block enters first hydraulic fluid port；
Under second predetermined state, the first reversal valve described in valve rod action drives and the described second commutation valve events, first oil
Mouth is turned on the 3rd hydraulic fluid port, and the 4th hydraulic fluid port is turned on the 6th hydraulic fluid port；Acting on the handle makes fluid from described
First valve block enters the 4th hydraulic fluid port.
3. lifter control device according to claim 2, it is characterised in that：The first valve block by quick-release connector with
The 4th interface connection of second reversal valve.
4. lifter control device according to claim 1, it is characterised in that：The hydraulic pressure output valve group is circumscribed with some
Two-way cylinder is its fuel feeding.
5. lifter control device according to claim 1, it is characterised in that：First reversal valve is changed with described second
It is two-way triple valve to valve.
6. lifter control device according to claim 1, it is characterised in that：First reversal valve is changed with described second
It is ball valve to valve.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710541421.9A CN107191421B (en) | 2017-07-05 | 2017-07-05 | A kind of lifter control device |
| PCT/CN2018/091891 WO2019007208A1 (en) | 2017-07-05 | 2018-06-19 | Lifter control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710541421.9A CN107191421B (en) | 2017-07-05 | 2017-07-05 | A kind of lifter control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107191421A true CN107191421A (en) | 2017-09-22 |
| CN107191421B CN107191421B (en) | 2018-10-30 |
Family
ID=59881290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710541421.9A Active CN107191421B (en) | 2017-07-05 | 2017-07-05 | A kind of lifter control device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107191421B (en) |
| WO (1) | WO2019007208A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019007208A1 (en) * | 2017-07-05 | 2019-01-10 | 江苏常发农业装备股份有限公司 | Lifter control device |
Citations (7)
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|---|---|---|---|---|
| JP2003049453A (en) * | 2001-08-07 | 2003-02-21 | Shin Caterpillar Mitsubishi Ltd | Hydraulic circuit of construction machine |
| CN201176982Y (en) * | 2008-03-04 | 2009-01-07 | 福田雷沃国际重工股份有限公司 | Device for implementing single and double acting conversion of tractor lifting cylinder |
| CN103256334A (en) * | 2013-04-28 | 2013-08-21 | 潍坊威度电子科技有限公司 | Double-action hydraulic oil cylinder tractor suspension hydraulic system based on electromagnetic digital valve |
| CN104196803A (en) * | 2014-09-11 | 2014-12-10 | 中国农业大学 | Multifunctional thread insertion valve used for heavy tractor electro-hydraulic lifter |
| CN105422530A (en) * | 2014-10-30 | 2016-03-23 | 徐州重型机械有限公司 | Pilot integrated multi-way valve group and crane |
| CN106168237A (en) * | 2016-09-14 | 2016-11-30 | 河南瑞创通用机械制造有限公司 | A kind of tractor hydraulic system assembly |
| CN206889377U (en) * | 2017-07-05 | 2018-01-16 | 江苏常发农业装备股份有限公司 | A kind of lifter control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6000315A (en) * | 1998-05-04 | 1999-12-14 | Deere & Company | Lift control for implement frame |
| CN201420716Y (en) * | 2009-04-07 | 2010-03-10 | 金城集团有限公司 | Lifting device for remote-control hydraulic control pedal |
| CN102926359A (en) * | 2011-08-08 | 2013-02-13 | 扬州蓝翔机电工程有限公司 | Manual and electric dual-purpose integrated hydraulic hoist |
| CN205383127U (en) * | 2014-10-19 | 2016-07-13 | 温州市维东润滑设备制造有限公司 | Automatic two powered hydraulic pressure pump stations of switching mode |
| CN105179343B (en) * | 2015-10-27 | 2017-03-22 | 中国矿业大学 | Multi-cylinder synchronous energy-saving efficient hydraulic lifting system and method |
| CN205136183U (en) * | 2015-10-27 | 2016-04-06 | 中国矿业大学 | Energy -conserving high -efficient hydraulic lifting system of multi -cylinder synchronization |
| CN107191421B (en) * | 2017-07-05 | 2018-10-30 | 江苏常发农业装备股份有限公司 | A kind of lifter control device |
-
2017
- 2017-07-05 CN CN201710541421.9A patent/CN107191421B/en active Active
-
2018
- 2018-06-19 WO PCT/CN2018/091891 patent/WO2019007208A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003049453A (en) * | 2001-08-07 | 2003-02-21 | Shin Caterpillar Mitsubishi Ltd | Hydraulic circuit of construction machine |
| CN201176982Y (en) * | 2008-03-04 | 2009-01-07 | 福田雷沃国际重工股份有限公司 | Device for implementing single and double acting conversion of tractor lifting cylinder |
| CN103256334A (en) * | 2013-04-28 | 2013-08-21 | 潍坊威度电子科技有限公司 | Double-action hydraulic oil cylinder tractor suspension hydraulic system based on electromagnetic digital valve |
| CN104196803A (en) * | 2014-09-11 | 2014-12-10 | 中国农业大学 | Multifunctional thread insertion valve used for heavy tractor electro-hydraulic lifter |
| CN105422530A (en) * | 2014-10-30 | 2016-03-23 | 徐州重型机械有限公司 | Pilot integrated multi-way valve group and crane |
| CN106168237A (en) * | 2016-09-14 | 2016-11-30 | 河南瑞创通用机械制造有限公司 | A kind of tractor hydraulic system assembly |
| CN206889377U (en) * | 2017-07-05 | 2018-01-16 | 江苏常发农业装备股份有限公司 | A kind of lifter control device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019007208A1 (en) * | 2017-07-05 | 2019-01-10 | 江苏常发农业装备股份有限公司 | Lifter control device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019007208A1 (en) | 2019-01-10 |
| CN107191421B (en) | 2018-10-30 |
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