CN104790457B - A kind of electrohydraulic control method of positive flow system and its application on hydraulic grab - Google Patents
A kind of electrohydraulic control method of positive flow system and its application on hydraulic grab Download PDFInfo
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Abstract
The invention discloses a kind of electrohydraulic control method of positive flow system, belongs to electrohydraulic control system field, comprises the following steps：(1) controller detects the load of action, calculates the flow parameter and coefficient of relationship for needing；(2) difference according to flow parameter, obtains different handle coefficients；(3) electric current of main pump electricity proportional pressure-reducing valve according to flow parameter, the difference of coefficient of relationship, is obtained, the discharge capacity to main pump is completed according to electric current and is adjusted；Present invention also offers application of the method on hydraulic grab, is controlled to the electric proportional pressure-reducing valve of main pump according to the electric signal of electric ratio handle, realize that any action is matched completely with the regulation power of pump.The method of the present invention is controlled to adjust by aligning the positive flow of control pump and electro-hydraulic banked direction control valves, makes pump be matched in real time with pump power completely with engine power, load, and system reduces system heat generation without throttling, spill losses, reduces fuel consumption；Without delayed, fast response time.
Description
Technical field
The present invention relates to a kind of electrohydraulic control method of positive flow system, more particularly to a kind of electro-hydraulic control of positive flow system
Method processed and its application on hydraulic grab, belong to electrohydraulic control system field.
Background technology
As urban land day is becoming tight, the appearance of high-rise and high-rise building, diaphram wall is from outside as underground room
Wall is developed into becomes skyscraper load-bearing basis, and use range is more and more wider, acts on also increasingly apparent.Diaphram wall is on ground
Be the antiseepage that intercepts water below face, gear soil, load-bearing and the continuous wall constructed, because its Construction Vibration is little, noise is low, wall stiffness is big,
The advantages of barrier performance is good, application prospect, market prospects are quite wide.
Load-sensitive hydraulic control being adopted subterranean continuous wall hydraulic grab control system on the market at present, i.e., according to negative more
Carry need pressure, flow matching the output pressure of pump, flow to improve the control efficiency of hydraulic system, find in use,
Existing control system is primarily present following deficiency：
1) plural action compound tense, can etc. not cause the waste on power due to the pressure of each load；
2) variable is realized from the action of hydraulic controlled operation handle to pump, intermediate link is more, can causes that power match is delayed, action
It is slow；
3) simple hydraulic control system cannot match the absorbed power of engine realtime power and pump.
The content of the invention
For the problem that above-mentioned prior art is present, the present invention provide a kind of electrohydraulic control method of positive flow system and its
Application on hydraulic grab, effectively meets demand of the subterranean continuous wall hydraulic grab in various operations to flow system flow, makes
Pump is matched with pump power completely in real time with engine power, load, improves operating efficiency.
To achieve these goals, the electrohydraulic control method of a kind of positive flow system that the present invention is adopted, the method include
Following steps,
(1) controller detects the load of action, and calculates the stream for being needed during wherein each load valve core of main valve standard-sized sheet altogether
Amount Q, necessary flow Q0 when handle and left and right walking pressure sensor signal real-time action；
Supplied maximum stream flow Qmax of two main pumps of calculating；
According to engine power curve, calculate engine speed rate of change and power variation rate coefficient of relationship is received with pumping
K2；
(2) according to parameter Q, Q0 and Qmax obtained in step (1),
Work as Q<During Qmax, each pilot signal from minimum to maximum change corresponding to each valve element open degree 0-100%, now,
Handle COEFFICIENT K 1=1 of each pilot signal；
As Q >=Qmax, each pilot signal controls handle COEFFICIENT K 1=Qmax/Q that each valve element is opened；
(3) according to parameter Q, Q0 and K2 drawn in step (1), (2),
Work as Q<During Qmax, according to the electric current and discharge relation curve of main pump electricity proportional pressure-reducing valve, calculate when outflow is Q
Electric current I1, the electric current I=I1*K2*Q0/Q of main pump electricity proportional pressure-reducing valve；
As Q >=Qmax, the electric current I=Imax*K2*Q0/Q of main pump electricity proportional pressure-reducing valve, wherein Imax are main pump electricity ratio
Electric current during example pressure-reducing valve standard-sized sheet；
Above formula is drawn when being 0mA for hypothesis main pump electricity proportional pressure-reducing valve firing current；
After drawing the electric current of main pump electricity proportional pressure-reducing valve, complete the discharge capacity to main pump and adjust.
Present invention also offers a kind of application of electrohydraulic control method of above-mentioned positive flow system on hydraulic grab, hydraulic pressure
Include controller, main pump and main valve in grab bucket, main pump is connected with main valve by pipeline, controller is connected with the engine for providing power
Connect, also include indoor left and right electric ratio twin shaft handle being driven installed in the hydraulic grab machine, be separately mounted to grab claw hydraulic control
Left and right walking pressure sensor in foot pedal guide's oil circuit, the electric proportional pressure-reducing valve on main pump, installed in control
Elevator automatic/hand switching switch and front/rear elevator switching switch on panel, described main valve is electro-hydraulic proportional multi-way valve,
Main valve includes turning round electro hydraulic valve, oil cylinder electro hydraulic valve, grab bucket electro hydraulic valve, front elevator electro hydraulic valve, rear elevator electro hydraulic valve, grab bucket closed jet
Electro hydraulic valve, left lateral walk pilot operated valve device and right lateral walks pilot operated valve device, and the application process is comprised the following steps：
(1) when subterranean continuous wall hydraulic grab works, action signal is detected by controller, wherein analog signal is converted to
Data signal, analog signal have right handles grab bucket opening and closing signal value A1 respectively, and elevator signal value A2 before right handles is rolled up after right handles
Raise signal value A3, left handle revolution signal value A4, left handle oil cylinder signal value A5, left threading walking pressure P1, right threading walking
Pressure P2, switching signal have right handles to carry grab bucket closed jet switch S1, elevator automatic/hand switching switch S2, front volume respectively
Raise/rear elevator switching switch S3；
(2) when it is 0 that controller detects elevator automatic/hand switching switch S2, it is elevator automatic mode, elevator in front and back
Double acting operation mode；
It is elevator manual mode when S2 is 1, elevator single action mode in front and back, current elevator/rear elevator switching switch S3
For 0 when be front elevator single action, when S3 be 1 when be rear elevator single action；
(3) controller detects the load of action, and calculates the stream for being needed during wherein each load valve core of main valve standard-sized sheet altogether
Amount Q, necessary flow Q0 when handle and left and right walking pressure sensor signal real-time action；
Supplied maximum stream flow Qmax of two main pumps of calculating；
According to engine power curve, calculate engine speed rate of change and power variation rate coefficient of relationship is received with pumping
K2；
(4) according to parameter Q, Q0 and Qmax obtained in step (3),
Work as Q<During Qmax, each pilot signal from minimum to maximum change corresponding to each valve element open degree 0-100%, now,
Handle COEFFICIENT K 1=1 of each pilot signal；
As Q >=Qmax, each pilot signal controls handle COEFFICIENT K 1=Qmax/Q that each valve element is opened；
(5) according to parameter Q, Q0 and K2 drawn in step (3), (4),
Work as Q<During Qmax, according to the electric current and discharge relation curve of main pump electricity proportional pressure-reducing valve, calculate when outflow is Q
Electric current I1, the electric current I=I1*K2*Q0/Q of main pump electricity proportional pressure-reducing valve；
As Q >=Qmax, the electric current I=Imax*K2*Q0/Q of main pump electricity proportional pressure-reducing valve, wherein Imax are main pump electricity ratio
Electric current during example pressure-reducing valve standard-sized sheet；
Above formula is drawn when being 0mA for hypothesis main pump electricity proportional pressure-reducing valve firing current；
After drawing the electric current of main pump electricity proportional pressure-reducing valve, complete the discharge capacity to main pump and adjust；
(6) according to the parameter drawn in step (4), last handle COEFFICIENT K=K1*K2 draws right handles grab bucket opening and closing letter
Number value A1*K, elevator signal value A2*K before right handles, elevator signal value A3*K after right handles, left handle revolution signal value A4*K,
Left handle oil cylinder signal value A5*K；
By the above-mentioned action signal of monitoring control devices, after being translated into data signal, realize main pump with main valve just
Flow-rate adjustment, makes main pump match with pump power with engine power, load.
As a further improvement on the present invention, when speed probe, the main pump of grab claw are installed on the engine of grab claw
For two, electric proportional pressure-reducing valve is installed, and goes beyond one's commission electric proportional pressure-reducing valve equipped with guide, controller detection engine speed falls speed
Situation, by guide go beyond one's commission electric proportional pressure-reducing valve have precedence over main pump electricity proportional pressure-reducing valve adjust pump power, prevent speed more than sky
Walk around speed 7% when and cause engine misses.
The electrohydraulic control method of the positive flow system of the present invention is by the positive flow control and regulation in electro-hydraulic machinery, making pump
Matched with pump power completely with engine power, load, it is ensured that each one action or composite move power realize real-time speed regulating, reality
When match, composite move limits some actions, prevents maloperation, and system reduces system heat generation without throttling, spill losses, reduces
Fuel consumption.When the inventive method is used for subterranean continuous wall hydraulic grab, by left and right electric ratio twin shaft handle, hydraulic control row
Walking foot-operated pilot pressure carries out positive flow control and regulation to main pump electricity proportional pressure-reducing valve, works well.
Description of the drawings
Fig. 1 is the electric principle schematic of the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
A kind of electrohydraulic control method of positive flow system, the method are comprised the following steps,
(1) controller detects the load of action, and calculates the stream for being needed during wherein each load valve core of main valve standard-sized sheet altogether
Amount Q, necessary flow Q0 when handle and left and right walking pressure sensor signal real-time action；
Supplied maximum stream flow Qmax of two main pumps of calculating；
According to engine power curve, calculate engine speed rate of change and power variation rate coefficient of relationship is received with pumping
K2；
(2) according to parameter Q, Q0 and Qmax obtained in step (1),
Work as Q<During Qmax, each pilot signal from minimum to maximum change corresponding to each valve element open degree 0-100%, now,
Handle COEFFICIENT K 1=1 of each pilot signal；
As Q >=Qmax, each pilot signal controls handle COEFFICIENT K 1=Qmax/Q that each valve element is opened；
(3) according to parameter Q, Q0 and K2 drawn in step (1), (2),
Work as Q<During Qmax, according to the electric current and discharge relation curve of main pump electricity proportional pressure-reducing valve, calculate when outflow is Q
Electric current I1, the electric current I=I1*K2*Q0/Q of main pump electricity proportional pressure-reducing valve；
As Q >=Qmax, the electric current I=Imax*K2*Q0/Q of main pump electricity proportional pressure-reducing valve, wherein Imax are main pump electricity ratio
Electric current during example pressure-reducing valve standard-sized sheet；
Above formula is drawn when being 0mA for hypothesis main pump electricity proportional pressure-reducing valve firing current；
After drawing the electric current of main pump electricity proportional pressure-reducing valve, complete the discharge capacity to main pump and adjust.
As shown in figure 1, when said method is applied on subterranean continuous wall hydraulic grab, including control on hydraulic grab
Device, main pump and main valve, main pump are connected with main valve by pipeline, and controller is connected with the engine for providing power, also including installation
Indoor left and right electric ratio twin shaft handle is driven in the hydraulic grab machine, grab claw hydraulic control foot pedal guide is separately mounted to
Left and right walking pressure sensor on oil circuit, the electric proportional pressure-reducing valve on main pump install elevator on the control panel
Automatic/hand switching switch and front/rear elevator switching switch, described main valve is electro-hydraulic proportional multi-way valve, and main valve includes revolution
Electro hydraulic valve, oil cylinder electro hydraulic valve, grab bucket electro hydraulic valve, front elevator electro hydraulic valve, rear elevator electro hydraulic valve, grab bucket closed jet electro hydraulic valve, left lateral
Walk pilot operated valve device and right lateral walks pilot operated valve device；
Described left electric ratio twin shaft handle by controller respectively with main pump on electric proportional pressure-reducing valve, in main valve time
Turn electro hydraulic valve and the connection of oil cylinder electro hydraulic valve, left and right revolution and the oil cylinder for controlling grab claw is flexible；
Described right electric ratio twin shaft handle by controller respectively with main pump on electric proportional pressure-reducing valve, in main valve before
Elevator and rear elevator electro hydraulic valve, grab bucket closed jet electro hydraulic valve, grab bucket electro hydraulic valve connection, control grab bucket opening and closing, the elevator of grab claw
Lifting, grab bucket interflow；
Left lateral on described grab claw hydraulic control foot pedal walk pressure sensor, right lateral walk pressure sensor all pass through control
Device processed is connected with the electric proportional pressure-reducing valve on main pump；
Described grab claw hydraulic control foot pedal respectively with main valve in left lateral walk pilot operated valve device, right lateral walk pilot operated valve device by pipe
Road connects；
Described elevator automatic/hand switching switch and front/rear elevator switching switch are connected with controller respectively, realize volume
The switching for raising pattern is adjusted.
The application process specifically includes following steps：
(1) flow of two main pumps in the positive flow system supplies a main valve, valve core of main valve often to join including front elevator electricity
Liquid valve, rear elevator electro hydraulic valve, oil cylinder electro hydraulic valve, revolution electro hydraulic valve, left lateral are walked pilot operated valve device, right lateral and walk pilot operated valve device, grab bucket opening and closing electricity
Liquid valve, grab bucket closed jet electro hydraulic valve totally 8, each connection valve element standard-sized sheet flow is differed；
(2) main valve events are divided into 20 groups of operating states by the operational motion demand according to subterranean continuous wall hydraulic grab, its
In, simply connected action includes front hoisting, rear hoisting, grab bucket is opened and closed, left lateral is walked, right lateral is walked, left and right is turned round, oil cylinder stretches
Totally 7 groups；
Duplex action includes that front hoisting+rear hoisting, a left side+right lateral are walked, grab bucket is opened and closed+grabs bucket interflow, left and right is returned
Turn+grab bucket opening and closing, left lateral walk+left and right revolution, right lateral walk+left and right revolution totally 6 groups；
Three linkages are made to include front hoisting+rear hoisting+grab bucket opening and closing, front hoisting+rear hoisting+left and right
Revolution, left lateral walk+and right lateral walks+left and right revolution, left lateral walk+right lateral walks+and oil cylinder is flexible, front hoisting+rear hoisting+luffing
Flexible totally 5 groups；
Tetrad action include front hoisting+rear hoisting+left lateral walk+right lateral walks, front hoisting+rear hoisting
Totally 2 groups of+grab bucket opening and closing+left and right revolution.Composite move limits some actions, it is not all it is compound can action, effectively can prevent
Only maloperation；
(3) when subterranean continuous wall hydraulic grab works, action signal is detected by controller, wherein analog signal is converted to
Data signal, analog signal have right handles grab bucket opening and closing signal value A1 respectively, and elevator signal value A2 before right handles is rolled up after right handles
Raise signal value A3, left handle revolution signal value A4, left handle oil cylinder signal value A5, left threading walking pressure P1, right threading walking
Pressure P2；
(4) when it is 0 that controller detects elevator automatic/hand switching switch S2, it is elevator automatic mode, elevator in front and back
Double acting operation mode；
It is elevator manual mode when S2 is 1, elevator single action mode in front and back, current elevator/rear elevator switching switch S3
For 0 when be front elevator single action, when S3 be 1 when be rear elevator single action；
(5) controller detects the load of action, and calculates the stream for being needed during wherein each load valve core of main valve standard-sized sheet altogether
Q is measured, handle (including grab bucket closed jet switching signal) and left and right walking pressure sensor signal (hydraulic control foot pedal) are moved in real time
Necessary flow Q0 when making；
Supplied maximum stream flow Qmax of two main pumps of calculating；
According to engine power curve, calculate engine speed rate of change and power variation rate coefficient of relationship is received with pumping
K2；
(6) according to parameter Q, Q0 and Qmax obtained in step (3),
Work as Q<During Qmax, each pilot signal from minimum to maximum change corresponding to each valve element open degree 0-100%, now,
Handle COEFFICIENT K 1=1 of each pilot signal；
As Q >=Qmax, each pilot signal controls handle COEFFICIENT K 1=Qmax/Q that each valve element is opened；
(7) according to parameter Q, Q0 and K2 drawn in step (3), (4),
Work as Q<During Qmax, according to the electric current and discharge relation curve of main pump electricity proportional pressure-reducing valve, calculate when outflow is Q
Electric current I1, the electric current I=I1*K2*Q0/Q of main pump electricity proportional pressure-reducing valve；
As Q >=Qmax, the electric current I=Imax*K2*Q0/Q of main pump electricity proportional pressure-reducing valve, wherein Imax are main pump electricity ratio
Electric current during example pressure-reducing valve standard-sized sheet；
Above formula is drawn when being 0mA for hypothesis main pump electricity proportional pressure-reducing valve firing current；
After drawing the electric current of main pump electricity proportional pressure-reducing valve, complete the discharge capacity to main pump and adjust；
(8) according to the parameter drawn in step (4), last handle COEFFICIENT K=K1*K2 draws right handles grab bucket opening and closing letter
Number value A1*K, elevator signal value A2*K before right handles, elevator signal value A3*K after right handles, left handle revolution signal value A4*K,
Left handle oil cylinder signal value A5*K；
By the above-mentioned action signal of monitoring control devices, after being translated into data signal, realize main pump with main valve just
Flow-rate adjustment, makes main pump match with pump power with engine power, load.
(9) when speed probe is installed on the engine of grab claw, the main pump of grab claw is two, is provided with electric ratio and subtracts
Pressure valve, and going beyond one's commission electric proportional pressure-reducing valve equipped with guide, controller detection engine speed falls fast situation, is gone beyond one's commission electricity ratio by guide
Example pressure-reducing valve has precedence over main pump electricity proportional pressure-reducing valve and adjusts pump power, causes to send out when preventing speed to be more than the 7% of idler revolutions
Motivation is stopped working.
To above-mentioned every group of action, according to the relation of Q and Qmax when every valve element uninterrupted, every group of action standard-sized sheet, start
The realtime power of machine, during controller control bound electro hydraulic valve valve core opening, handle signal is multiplied by COEFFICIENT K, K=K1*K2；And control
The electric current I=Imax*K2*Q0/Q or I=I1*K2*Q0/Q of device control main pump electricity proportional pressure-reducing valve processed (assumes electric proportional pressure-reducing valve
Firing current be 0mA)；Realize each action or the power of composite move pump with the realtime power of engine and load matched.
Flow needed for being total to during each load valve core of main valve standard-sized sheet when the Q occurred in the present invention is for every group of operating state；Q0
When being every group of operating state, each handle signal (including grab bucket closed jet) and left and right the real-time of walking pressure sensor signal are moved
Flow when making；Qmax supplies maximum stream flow by two main pumps；K1 is by the handle system that determined according to the magnitude relationship of Q and Qmax
Number；K2 is that engine speed rate of change receives power variation rate coefficient of relationship with pumping；I1 is to work as Q<During Qmax, main pump electricity ratio subtracts
The maximum current of pressure valve；Electric current when Imax is main pump electricity proportional pressure-reducing valve standard-sized sheet.
Claims (3)
1. a kind of electrohydraulic control method of positive flow system, it is characterised in that the method is comprised the following steps,
(1) controller detects the load of action, and calculates the flow Q for being needed during wherein each load valve core of main valve standard-sized sheet altogether,
Necessary flow Q0 when handle and left and right walking pressure sensor signal real-time action；
Supplied maximum stream flow Qmax of two main pumps of calculating；
According to engine power curve, calculate engine speed rate of change and power variation rate coefficient of relationship K2 is received with pumping；
(2) according to parameter Q, Q0 and Qmax obtained in step (1),
Work as Q<During Qmax, each pilot signal is from minimum to maximum change corresponding to each valve element open degree 0-100%, now, each elder generation
Lead handle COEFFICIENT K 1=1 of signal；
As Q >=Qmax, each pilot signal controls handle COEFFICIENT K 1=Qmax/Q that each valve element is opened；
(3) according to parameter Q, Q0 and K2 drawn in step (1), (2),
Work as Q<During Qmax, according to the electric current and discharge relation curve of main pump electricity proportional pressure-reducing valve, electric current when outflow is Q is calculated
I1, the electric current I=I1*K2*Q0/Q of main pump electricity proportional pressure-reducing valve；
As Q >=Qmax, the electric current I=Imax*K2*Q0/Q of main pump electricity proportional pressure-reducing valve, wherein Imax are that main pump electricity ratio subtracts
Electric current during pressure valve standard-sized sheet；
Above formula is drawn when being 0mA for hypothesis main pump electricity proportional pressure-reducing valve firing current；
After drawing the electric current of main pump electricity proportional pressure-reducing valve, complete the discharge capacity to main pump and adjust.
2. application of the electrohydraulic control method of the positive flow system described in a kind of claim 1 on hydraulic grab, its feature exist
In, including controller, main pump and main valve on hydraulic grab, main pump is connected with main valve by pipeline, controller and offer power
Engine connects, and also includes driving indoor left and right electric ratio twin shaft handle installed in the hydraulic grab machine, is separately mounted to grab
Left and right walking pressure sensor in bucket machine hydraulic control foot pedal guide's oil circuit, the electric proportional pressure-reducing valve on main pump, peace
Dress elevator automatic/hand switching switch on the control panel and front/rear elevator switching switch, described main valve is electric-hydraulic proportion
Banked direction control valves, main valve include turning round electro hydraulic valve, oil cylinder electro hydraulic valve, grab bucket electro hydraulic valve, front elevator electro hydraulic valve, rear elevator electro hydraulic valve, grab
Bucket closed jet electro hydraulic valve, left lateral walks pilot operated valve device and right lateral walks pilot operated valve device, the application process is comprised the following steps：
(1) when subterranean continuous wall hydraulic grab works, action signal is detected by controller, wherein analog signal is converted to numeral
Signal, analog signal have right handles grab bucket opening and closing signal value A1, elevator signal value A2 before right handles, elevator letter after right handles respectively
Number value A3, left handle revolution signal value A4, left handle oil cylinder signal value A5, left threading walking pressure P1, right threading walking pressure
P2, switching signal have respectively right handles carry grab bucket closed jet switch S1, elevator automatic/hand switching switch S2, front elevator/after
Elevator switching switch S3；
(2) when it is 0 that controller detects elevator automatic/hand switching switch S2, it is elevator automatic mode, elevator is double acting in front and back
Operation mode；
It is elevator manual mode when S2 is 1, elevator single action mode in front and back, when current elevator/rear elevator switching switch S3 is 0
For front elevator single action, it is rear elevator single action when S3 is 1；
(3) controller detects the load of action, and calculates the flow Q for being needed during wherein each load valve core of main valve standard-sized sheet altogether,
Necessary flow Q0 when handle and left and right walking pressure sensor signal real-time action；
Supplied maximum stream flow Qmax of two main pumps of calculating；
According to engine power curve, calculate engine speed rate of change and power variation rate coefficient of relationship K2 is received with pumping；
(4) according to parameter Q, Q0 and Qmax obtained in step (3),
Work as Q<During Qmax, each pilot signal is from minimum to maximum change corresponding to each valve element open degree 0-100%, now, each elder generation
Lead handle COEFFICIENT K 1=1 of signal；
As Q >=Qmax, each pilot signal controls handle COEFFICIENT K 1=Qmax/Q that each valve element is opened；
(5) according to parameter Q, Q0 and K2 drawn in step (3), (4),
Work as Q<During Qmax, according to the electric current and discharge relation curve of main pump electricity proportional pressure-reducing valve, electric current when outflow is Q is calculated
I1, the electric current I=I1*K2*Q0/Q of main pump electricity proportional pressure-reducing valve；
As Q >=Qmax, the electric current I=Imax*K2*Q0/Q of main pump electricity proportional pressure-reducing valve, wherein Imax are that main pump electricity ratio subtracts
Electric current during pressure valve standard-sized sheet；
Above formula is drawn when being 0mA for hypothesis main pump electricity proportional pressure-reducing valve firing current；
After drawing the electric current of main pump electricity proportional pressure-reducing valve, complete the discharge capacity to main pump and adjust；
(6) according to the parameter drawn in step (4), last handle COEFFICIENT K=K1*K2 draws right handles grab bucket opening and closing signal value
A1*K, elevator signal value A2*K before right handles, elevator signal value A3*K after right handles, left handle revolution signal value A4*K, left hand
Handle oil cylinder signal value A5*K；
By the above-mentioned action signal of monitoring control devices, the positive flow of main pump and main valve after being translated into data signal, is realized
Adjust, main pump is matched with pump power with engine power, load.
3. application of the electrohydraulic control method of a kind of positive flow system according to claim 2 on hydraulic grab, which is special
Levy and be, when speed probe is installed on the engine of grab claw, the main pump of grab claw is two, is provided with electric ratio decompression
Valve, and going beyond one's commission electric proportional pressure-reducing valve equipped with guide, controller detection engine speed falls fast situation, is gone beyond one's commission electric ratio by guide
Pressure-reducing valve has precedence over main pump electricity proportional pressure-reducing valve and adjusts pump power, causes to start when preventing speed to be more than the 7% of idler revolutions
Machine stops working.
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| CN105113563A (en) * | 2015-08-14 | 2015-12-02 | 徐州徐工基础工程机械有限公司 | Double winch control system of continuous wall grab bucket and control method of double winch control system |
| CN105438990B (en) * | 2015-12-30 | 2017-07-21 | 上海佩纳沙士吉打机械有限公司 | Hydraulic grab Autonomous test and security system and method |
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| CN102296665B (en) * | 2011-06-23 | 2013-04-24 | 上海三一重机有限公司 | Excavator hydraulic system carrying load sensing main valve and positive flow pump |
| CN202416430U (en) * | 2012-02-16 | 2012-09-05 | 熔盛机械有限公司 | Revolution buffering and arm movement priority control system in hydraulic control positive flow system of excavator |
| CN102758464B (en) * | 2012-07-09 | 2014-11-12 | 徐州徐工挖掘机械有限公司 | Method for controlling positive-flow hydraulic system of excavator |
| CN104005446B (en) * | 2014-04-01 | 2016-03-16 | 上海海希工业通讯股份有限公司 | The positive flow control method of excavator and system and excavator |
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