CN206723172U - Bender bidirectional pump liquid pressure control system - Google Patents
Bender bidirectional pump liquid pressure control system Download PDFInfo
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- CN206723172U CN206723172U CN201720435387.2U CN201720435387U CN206723172U CN 206723172 U CN206723172 U CN 206723172U CN 201720435387 U CN201720435387 U CN 201720435387U CN 206723172 U CN206723172 U CN 206723172U
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Abstract
The utility model bender bidirectional pump liquid pressure control system, belongs to bender technical field of hydraulic；Technical problem to be solved there is provided bender bidirectional pump liquid pressure control system, and using servomotor plus two-way pump, two hydraulic fluid ports of two-way pump are connected with the upper and lower cavity of hydraulic cylinder respectively, form and valve control identical control loop；Solve technical scheme that the technical problem uses for：Bender bidirectional pump liquid pressure control system, including servomotor, two-way pump and first liang of position and four-way reversing valve, servomotor is connected with two-way pump, pumping hole X2 is connected with first liang of position and four-way reversing valve, first liang of position and four-way reversing valve is connected with hydraulic cylinder and fuel tank, pumping hole X1 connects oil circuit and is divided into two-way, the first via is connected with 2/2-way Solenoid ball valve, second tunnel is connected with second liang of position and four-way reversing valve, 2/2-way Solenoid ball valve is connected with hydraulic cylinder, hydraulic cylinder is also associated with replenishing valve, replenishing valve is connected with fuel tank, second liang of position and four-way reversing valve is connected with replenishing valve and fuel tank.
Description
Technical field
The utility model bender bidirectional pump liquid pressure control system, belongs to bender technical field of hydraulic.
Background technology
With the development of control system and hydraulic technique, energy-conservation, efficient, noise reduction are proposed for traditional manufacture at this stage
Requirement；At present, bender industry mainly includes being based on throttle grverning principle using the hydraulic synchronous control system of two cylinders control
Proportional valve control（Or other valve control systems）Hydraulic system and pump control system based on volume synchronous variable-speed principle（Comprising double
To the pump control system of pump or one-way hydraulic pump motor etc.）；Wherein, valve control system uses more.
Pump control system is at present also in continually developing or the perfect stage；Although in the market occurs few in number
Bender pump control system, but either two-way pump controls, or the control of one-way hydraulic pump motor fails to commercially push away comprehensively
Extensively；To find out its cause, be on the one hand cost height, but most important is also due to that its versatility is not high；Specifically, it is because pump control
System can not be compatible with the electric-control system of current most of benders；Therefore, after the control mode by changing digital control system
Bender normal work can be made.
Utility model content
The utility model overcomes the shortcomings of the prior art, there is provided bender bidirectional pump liquid pressure control system, adopts
With servomotor plus two-way pump, by hydraulic circuit, two hydraulic fluid ports of two-way pump are connected with the upper and lower cavity of hydraulic cylinder respectively, form
With the identical control loop of control mode of valve control, the logical of most of bender electric control system controls in the market is adapted to
With type pump control system.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is：Bender bidirectional pump hydraulic control
System, including servomotor, two-way pump and first liang of position and four-way reversing valve, the clutch end and two-way pump of the servomotor
Connection, the two-way pump include pumping hole X1 and pumping hole X2, and the pumping hole X2 is connected with the working hole of first liang of position and four-way reversing valve,
The oil inlet of first liang of position and four-way reversing valve and the rodless cavity of hydraulic cylinder connect, and first liang of position and four-way reversing valve returns
Hydraulic fluid port is connected with fuel tank, and the pumping hole X1 connects oil circuit and is divided into two-way, and the first via is connected with 2/2-way Solenoid ball valve, the second tunnel
It is connected with the oil inlet of second liang of position and four-way reversing valve, the rod chamber connection of the 2/2-way Solenoid ball valve and hydraulic cylinder, institute
The rod chamber for stating hydraulic cylinder is also associated with the working hole of replenishing valve, and the oil inlet of the replenishing valve is connected with fuel tank, and described second
The working hole of two position and four-way reversing valves is connected with replenishing valve, and the oil return opening of second liang of position and four-way reversing valve is connected with fuel tank.
The pumping hole X1 and pumping hole X2 are connected with fuel tank, and first is provided with the oil circuit between the pumping hole X1 and fuel tank
Oil-suction oil filter and the first check valve, the second oil-suction oil filter and second are provided with the oil circuit between the pumping hole X2 and fuel tank
Check valve.
The first damping is provided with second liang of oil circuit between position and four-way reversing valve and replenishing valve.
The 3rd check valve is provided with oil circuit between the 2/2-way Solenoid ball valve and pumping hole X1, the described 3rd is unidirectional
The direction of valve is identical with the ball valve direction of 2/2-way Solenoid ball valve.
Resistance overflow valve is parallel with where 3rd check valve on oil circuit, the resistance overflow valve has bar for hydraulic cylinder
Chamber provides resistance to pumping hole X1 oil returns.
Oil circuit where the 2/2-way Solenoid ball valve is parallel with work and enters overflow valve, and the work, which enters overflow valve, makes hydraulic cylinder
Piston is descending at a slow speed, and the work is entered overflow valve and connected with resistance overflow valve, and the oil pressure relief that the work enters overflow valve is more than resistance
Overflow valve.
The rod chamber of the hydraulic cylinder is connected with cavity of resorption overflow valve, and the cavity of resorption overflow valve is the peace of the rod chamber of hydraulic cylinder
Full valve.
The second damping is provided between the oil return opening and fuel tank of two position and four-way reversing valve.
The working hole of second liang of position and four-way reversing valve is connected with fuel tank, the work of second liang of position and four-way reversing valve
The 3rd damping and safety overflow valve are provided with oil circuit between mouth and fuel tank.
System safety overflow valve is provided between the pumping hole X2 and fuel tank.
The utility model has the advantages that compared with prior art：
1st, the utility model adds two-way pump on the basis of existing pump control hydraulic system using servomotor, is returned by hydraulic pressure
Road, two hydraulic fluid ports of two-way pump are connected with the upper and lower cavity of hydraulic cylinder, constituted identical with the control mode of valve control respectively
Control loop, entirely appropriate for the bender electric-control system of conventional proportional valve control, the folding of the control proportioning valve used in the past
Bender electric-control system, it is that can realize slider of bender, soon by controlling two-way pump control system of the present utility model completely
Under, work is entered, pressurize, the action such as off-load and backhaul.
2nd, the utility model adjusts two-way pump oil drain quantity, controls bender liquid by adjusting the rotating speed of servomotor in real time
The speed of cylinder pressure operation, is finally reached sliding block and is accurately positioned；The bidirectional rotation of oil pump, i.e. forward or reverse, are changed corresponding to ratio
It is that both direction can adjust during control to the left position of valve or right position, therefore controls the electric-control system of proportioning valve to can control this to be
System, it is suitable for the control of current most of bender digital control systems.
3rd, the utility model is two sets of identical pump control units, can be directly installed on the top of hydraulic cylinder respectively, be
System is joined directly together with hydraulic cylinder, can save the connection of intermediate duct, realizes that bender connects without oil pipe, simple installation is easy.
4th, the utility model is changed without several digital control systems more common to current bender, and versatility is stronger.
5th, in the system it is oil drain quantity by adjusting two-way pump, adjusts the synchronism of two hydraulic cylinders of bender, relatively
Small in the bender of proportional valve control, no restriction loss, system heat generation amount, in the interval of work, servomotor only exports lathe
The torque of very little, output speed, does not have a rest in machine area, substantially the loss without electric energy.
Brief description of the drawings
The utility model is described further below in conjunction with the accompanying drawings.
Fig. 1 is structural representation of the present utility model.
In figure：1 be replenishing valve, 2 be fuel tank, 3 be cavity of resorption overflow valve, 4 be work enter overflow valve, 5 be resistance overflow valve, 6 be
2/2-way Solenoid ball valve, 7 be the 3rd check valve, 8 be the first damping, 9 be the first oil-suction oil filter, 10 be the first check valve,
11 it is servomotor, 12 be two-way pump, 13 be the second check valve, 14 be the second oil-suction oil filter, 15 be hydraulic cylinder, 16 is first
Two position and four-way reversing valves, 17 be the second damping, 18 be safety overflow valve, 19 be the 3rd damping, 20 be the second two four-way commutations
Valve, 21 are system safety overflow valve.
Embodiment
As shown in figure 1, the utility model bender bidirectional pump liquid pressure control system, including servomotor 11, two-way pump 12
With first liang of position and four-way reversing valve 16, the clutch end of the servomotor 11 is connected with two-way pump 12, the two-way pump 12
Including pumping hole X1 and pumping hole X2, the pumping hole X2 is connected with the working hole of first liang of position and four-way reversing valve 16, described the first two
The oil inlet of four-way reversing valve 16 is connected with the rodless cavity of hydraulic cylinder 15, the oil return opening of first liang of position and four-way reversing valve 16 with
Fuel tank 2 is connected, and the pumping hole X1 connects oil circuit and is divided into two-way, and the first via is connected with 2/2-way Solenoid ball valve 6, the second tunnel and the
The oil inlet connection of two liang of position and four-way reversing valves 20, the 2/2-way Solenoid ball valve 6 are connected with the rod chamber of hydraulic cylinder 15, institute
The rod chamber for stating hydraulic cylinder 15 is also associated with the working hole of replenishing valve 1, and the oil inlet of the replenishing valve 1 is connected with fuel tank 2, described
The working hole of second liang of position and four-way reversing valve 20 is connected with replenishing valve 1, the oil return opening of second liang of position and four-way reversing valve 20 with
Fuel tank 2 connects.
The pumping hole X1 and pumping hole X2 are connected with fuel tank 2, and is provided with the oil circuit between the pumping hole X1 and fuel tank 2
One oil-suction oil filter 9 and the first check valve 10, the second oil-suction oil filter is provided with the oil circuit between the pumping hole X2 and fuel tank 2
14 and second check valve 13.
The first damping 8 is provided with oil circuit between second liang of position and four-way reversing valve 20 and replenishing valve 1.
The 3rd check valve 7 is provided with oil circuit between the 2/2-way Solenoid ball valve 6 and pumping hole X1, the described 3rd is single
It is identical with the ball valve direction of 2/2-way Solenoid ball valve 6 to the direction of valve 7.
Resistance overflow valve 5 is parallel with the place oil circuit of 3rd check valve 7, the resistance overflow valve 5 is hydraulic cylinder 15
Rod chamber to pumping hole X1 oil returns provide resistance.
The place oil circuit of 2/2-way Solenoid ball valve 6 is parallel with work and enters overflow valve 4, and the work, which enters overflow valve 4, makes hydraulic pressure
The piston of cylinder 15 is descending at a slow speed, and the work is entered overflow valve 4 and connected with resistance overflow valve 5, and the work enters the oil pressure relief of overflow valve 4
More than resistance overflow valve 5.
The rod chamber of the hydraulic cylinder 15 is connected with cavity of resorption overflow valve 3, and the cavity of resorption overflow valve 3 has bar for hydraulic cylinder 15
The safety valve of chamber.
The second damping 17 is provided between the oil return opening and fuel tank 2 of two position and four-way reversing valve 16.
The working hole of second liang of position and four-way reversing valve 20 is connected with fuel tank 2, second liang of position and four-way reversing valve 20
Working hole and fuel tank 2 between oil circuit on be provided with the 3rd damping 19 and safety overflow valve 18.
System safety overflow valve 21 is provided between the pumping hole X2 and fuel tank 2.
Specific work process：
It is by two independent control principle identical mould oscillating table designs due to the control of two hydraulic cylinders 15 of bender
Unit is realized jointly, and now with regard to being illustrated exemplified by the control principle of one of hydraulic cylinder 15, the control of another hydraulic cylinder 15 is former
Reason and description are identical with this.
Fast downlink acts：
YV1, YV3 obtain electric, and the hydraulic oil of the rod chamber of hydraulic cylinder 15 is through 6 right position of 2/2-way Solenoid ball valve, resistance overflow
Valve 5 enters to the pumping hole X2 of two-way pump 12；Sliding block drives the piston rapid decrease of hydraulic cylinder 15 under gravity, due to sliding block
Rapid decrease, closed type replenishing valve 1 is opened, and the fluid of fuel tank 2 is inhaled into the rodless cavity of hydraulic cylinder 15 by replenishing valve 1；
Digital control system gives the positive order of servomotor 11 simultaneously, and servomotor 11 drives two-way pump 12 to rotate forward oil suction, what two-way pump 12 sucked
Cavity of resorption fluid gets to pumping hole X2 through two-way pump 12, by first liang of 16 right position of position and four-way reversing valve, into hydraulic cylinder 15 without bar
Chamber, piston rod band movable slider is promoted to realize fast downlink.
Resistance overflow valve 5 provides certain resistance for fast downlink, prevent stall or it is fast under it is out of control；Sliding block descends speed to lead to soon
Toning integer control systematic parameter controls the rotating speed speed of servomotor 11 and obtained.
Work enters action：
YV2, YV3 obtain electric, remaining valve dead electricity, YV1 dead electricity, and 2/2-way Solenoid ball valve 6 is closed, and digital control system continues to watching
Take the positive order of motor 11, the rotating speed of servomotor 11 gradually reduces so that ram speed by fast downlink to tapering off, closed type
Replenishing valve 1 is reset to closing, the rodless cavity closing of hydraulic cylinder 15 in the presence of itself spring；Digital control system is to servomotor 11
Positive order, servomotor 11 drive two-way pump 12 speed change to rotate forward, and two-way pump 12 is through pumping hole X1 and the first oil absorption filter 9 from fuel tank
Oil suction in 2, the fluid through pumping hole X2 discharges, into the rodless cavity of hydraulic cylinder 15, push away through first liang of 16 right position of position and four-way reversing valve
Piston bar is descending, and the oil liquid pressure of the rod chamber of hydraulic cylinder 15 reaches the Opening pressure that work enters overflow valve 4, and work is entered into overflow valve
4 open, and fluid flows to pumping hole X1 through resistance overflow valve 5, through two-way pump 12, into pumping hole X2, eventually enter into the nothing of hydraulic cylinder 15
Rod cavity, so as to realize that the i.e. work descending at a slow speed of sliding block is entered.
Cavity of resorption overflow valve 3 is the safety valve of cavity of resorption, prevents the rod chamber hypertonia of hydraulic cylinder 15；Sliding block work speed can
Friction speed is obtained by adjusting the rotating speed of digital control system state modulator servomotor 11.
Pressurize acts：
YV2, YV3 continue electric, and digital control system is just referring to according to the deviation of torque setting value and actual value to servomotor 11
Order, servomotor 11 drive two-way pump 12 to slowly run, and keep the rodless cavity pressure of hydraulic cylinder 15 constant so that sliding block is parked in
Desired value carries out pressurize.
Off-load acts：
YV2, YV3 continue electric, and digital control system gives servomotor 11 negative instruction, and servomotor 11 drives two-way pump 12 to become
Speed reversion, the high-voltage oil liquid of the rodless cavity of hydraulic cylinder 15 is gradually extracted out through pumping hole X2 and first liang of 16 right position of position and four-way reversing valve,
Into pumping hole X1, a part of fluid progresses into hydraulic cylinder 15 through 2/2-way Solenoid ball valve 6, promotes piston rod slowly to rise,
A part of unnecessary fluid enters fuel tank 2, so through second liang of 20 right position of position and four-way reversing valve and safety overflow valve 18 from T2 mouths
So that the piston of hydraulic cylinder 15 slowly rises the distance of a very little, the unnecessary fluid of another part is overflow by safety overflow valve 18
Fuel tank 2 is flowed back to, makes the pressure of rod chamber will not rise a lot, system unloaded terminates；Digital control system can by adjust off-load away from
From or unloading time, complete hydraulic cylinder 15 off-load, off-load action prepared for return.
Return acts：
All equal dead electricity of magnetic valve, because YV3 is powered off, the pressure oil of the rodless cavity of hydraulic cylinder 15 remaining is through the first two four
The logical middle position of reversal valve 16, the second damping 17 return to fuel tank 2 from T2, release are further carried out to system.
Digital control system gives servomotor 11 negative instruction afterwards, and servomotor 11 drives two-way pump 12 to invert, two-way pump 12
From pumping hole X2 oil suctions, from pumping hole X1 oil extractions, the fluid of discharge is all the way through second liang of middle position of position and four-way reversing valve 20 and the first damping 8
Into the control chamber of replenishing valve 1, replenishing valve 1 is opened, the fluid of the rodless cavity of hydraulic cylinder 15 is largely returned to by replenishing valve 1
Fuel tank 2, fuel tank 2 is returned at least partially through first liang of position and four-way reversing valve 16；Another way fluid passes through the 3rd check valve 7 and two
Two logical Solenoid ball valves 6 enter the rod chamber of hydraulic cylinders 15, the quick upward return of piston rod；Opening speed can be adjusted by digital control system
Save the rotating speed of servomotor 11 and obtain friction speed.
Vertical motion at a slow speed：
YV2 obtains electric, remaining electromagnet dead electricity, and the fluid of the rodless cavity of hydraulic cylinder 15 returns through first liang of position and four-way reversing valve 16
To fuel tank 2；Digital control system gives servomotor 11 negative instruction, servomotor 11 drive two-way pump 12 invert at a slow speed, two-way pump 12 from
Fuel tank 2 is through the second oil-suction oil filter 14 and the second check valve 13, and through pumping hole X2 oil suctions, from pumping hole X1 oil extractions, the fluid of discharge leads to
Cross the rod chamber that the 3rd check valve 7 and 2/2-way Solenoid ball valve 6 enter hydraulic cylinder 15, unnecessary fluid is by the second two four
The logical damping of reversal valve the 20, the 3rd 19 and safety overflow valve 18, enter fuel tank 2, piston rod moves up at a slow speed from T2 mouths；Slow upper speed
Degree can be by the speed that adjusts the rotating speed of servomotor 11 to obtain different.
Two independent hydraulic control units that the utility model is made up of two servomotors 11 and two-way pump 12, respectively
The synchronous operation of two hydraulic cylinders 15 is controlled, the grating scale or magnetic railings ruler detected with digital control system, position is realized to sliding block jointly
Be accurately positioned.
In the utility model, in off-load and ascent stage at a slow speed, because the rod chamber of hydraulic cylinder 15 and rodless cavity area are different,
Unnecessary fluid damps 19 and the oil return box 2 of safety overflow valve 18 through second liang of position and four-way reversing valve the 20, the 3rd, realizes that bender is lived
The rising at a slow speed of stopper rod or unloading way and loop, it can also be used to other hydraulic control circuits identical or flexible with this, regard
For the utility model claims scope.
The control loop of one hydraulic cylinder 15 of the utility model is a hydraulic pressure unit, and the utility model uses two servos
Unit is used in conjunction with, and other are used alone the hydraulic system of a set of servo-hydraulic unit control of the present utility model or used simultaneously
The hydraulic system of two sets or more than two sets servo-hydraulic unit control of the present utility model, in the utility model claims model
Within enclosing.
Embodiment of the present utility model is explained in detail above in conjunction with accompanying drawing, but the utility model is not limited to
Embodiment is stated, in those of ordinary skill in the art's possessed knowledge, the utility model aims can also not departed from
On the premise of various changes can be made.
Claims (10)
1. bender bidirectional pump liquid pressure control system, it is characterised in that：Including servomotor（11）, two-way pump（12）With first liang
Position and four-way reversing valve（16）, the servomotor（11）Clutch end and two-way pump（12）Connection, the two-way pump（12）
Including pumping hole X1 and pumping hole X2, the pumping hole X2 and first liang of position and four-way reversing valve（16）Working hole connection, described first liang
Position and four-way reversing valve（16）Oil inlet and hydraulic cylinder（15）Rodless cavity connection, first liang of position and four-way reversing valve（16）'s
Oil return opening and fuel tank（2）Connection, the pumping hole X1 connect oil circuit and are divided into two-way, the first via and 2/2-way Solenoid ball valve（6）Even
Connect, the second tunnel and second liang of position and four-way reversing valve（20）Oil inlet connection, the 2/2-way Solenoid ball valve（6）With hydraulic cylinder
（15）Rod chamber connection, the hydraulic cylinder（15）Rod chamber be also associated with replenishing valve（1）Working hole, the replenishing valve
（1）Oil inlet and fuel tank（2）Connection, second liang of position and four-way reversing valve（20）Working hole and replenishing valve（1）Connection, institute
State second liang of position and four-way reversing valve（20）Oil return opening and fuel tank（2）Connection.
2. bender bidirectional pump liquid pressure control system according to claim 1, it is characterised in that：The pumping hole X1 and pumping hole
X2 is and fuel tank（2）Connection, the pumping hole X1 and fuel tank（2）Between oil circuit on be provided with the first oil-suction oil filter（9）With
One check valve（10）, the pumping hole X2 and fuel tank（2）Between oil circuit on be provided with the second oil-suction oil filter（14）It is single with second
To valve（13）.
3. bender bidirectional pump liquid pressure control system according to claim 1, it is characterised in that：The second two four-ways
Reversal valve（20）With replenishing valve（1）Between oil circuit on be provided with the first damping（8）.
4. bender bidirectional pump liquid pressure control system according to claim 1, it is characterised in that：The 2/2-way electromagnetism
The 3rd check valve is provided with oil circuit between ball valve 6 and pumping hole X1（7）, the 3rd check valve（7）Direction with two two
Logical Solenoid ball valve（6）Ball valve direction it is identical.
5. bender bidirectional pump liquid pressure control system according to claim 4, it is characterised in that：3rd check valve
（7）Resistance overflow valve is parallel with the oil circuit of place（5）, the resistance overflow valve（5）For hydraulic cylinder（15）Rod chamber to pumping hole
X1 oil returns provide resistance.
6. bender bidirectional pump liquid pressure control system according to claim 5, it is characterised in that：The 2/2-way electromagnetism
Ball valve（6）Place oil circuit is parallel with work and enters overflow valve（4）, the work enters overflow valve（4）Make hydraulic cylinder（15）Piston at a slow speed under
OK, the work enters overflow valve（4）With resistance overflow valve（5）Connection, the work enter overflow valve（4）Oil pressure relief overflow more than resistance
Flow valve（5）.
7. bender bidirectional pump liquid pressure control system according to claim 1, it is characterised in that：The hydraulic cylinder（15）'s
Rod chamber is connected with cavity of resorption overflow valve（3）, the cavity of resorption overflow valve（3）For hydraulic cylinder（15）Rod chamber safety valve.
8. bender bidirectional pump liquid pressure control system according to claim 1, it is characterised in that：Two four-ways commutation
Valve（16）Oil return opening and fuel tank（2）Between be provided with the second damping（17）.
9. bender bidirectional pump liquid pressure control system according to claim 1, it is characterised in that：The second two four-ways
Reversal valve（20）Working hole and fuel tank（2）Connection, second liang of position and four-way reversing valve（20）Working hole and fuel tank（2）It
Between oil circuit on be provided with the 3rd damping（19）And safety overflow valve（18）.
10. bender bidirectional pump liquid pressure control system according to claim 1, it is characterised in that：The pumping hole X2 and oil
Case（2）Between be provided with system safety overflow valve（21）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720435387.2U CN206723172U (en) | 2017-04-24 | 2017-04-24 | Bender bidirectional pump liquid pressure control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720435387.2U CN206723172U (en) | 2017-04-24 | 2017-04-24 | Bender bidirectional pump liquid pressure control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206723172U true CN206723172U (en) | 2017-12-08 |
Family
ID=60506598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720435387.2U Active CN206723172U (en) | 2017-04-24 | 2017-04-24 | Bender bidirectional pump liquid pressure control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206723172U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120323A (en) * | 2017-04-24 | 2017-09-01 | 登派液压技术（上海）有限公司 | Bender bidirectional pump liquid pressure control system |
| CN109139627A (en) * | 2018-11-06 | 2019-01-04 | 上海圣克赛斯液压机械有限公司 | Hydraulic system |
-
2017
- 2017-04-24 CN CN201720435387.2U patent/CN206723172U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120323A (en) * | 2017-04-24 | 2017-09-01 | 登派液压技术（上海）有限公司 | Bender bidirectional pump liquid pressure control system |
| CN109139627A (en) * | 2018-11-06 | 2019-01-04 | 上海圣克赛斯液压机械有限公司 | Hydraulic system |
| CN109139627B (en) * | 2018-11-06 | 2024-01-23 | 深圳中集天达空港设备有限公司 | Hydraulic system |
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