CN106837945A - A kind of hydraulic safe electric control system - Google Patents
A kind of hydraulic safe electric control system Download PDFInfo
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- CN106837945A CN106837945A CN201710179033.0A CN201710179033A CN106837945A CN 106837945 A CN106837945 A CN 106837945A CN 201710179033 A CN201710179033 A CN 201710179033A CN 106837945 A CN106837945 A CN 106837945A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to hydraulic control system technical field, and in particular to a kind of hydraulic safe electric control system；Hydraulic Power Transmission System includes the hydraulic system of unit head working cycles hydraulic system and hydraulic power slid platform, the electric control circuit includes unit head working cycles hydraulic system electric control circuit, delay circuit and hydraulic power slid platform automatic cyclic control circuit, and the hydraulic system of hydraulic power slid platform includes power set, executing agency, controls to adjust device and servicing unit.After reaching the setting time of the time relay, its timing closing closing of contact, relay KA3 time delays are made to connect electric, that is 2YA just starts rewind after being powered, hydraulic power slid platform automatic cyclic control circuit can realize manually and automatically 2 kinds of modes of operation, under automatic mode, often pressing one-shot button SB1 just can make power slide complete the working cycles of primary feed, with very strong creativeness.
Description
Technical field
The present invention relates to hydraulic control system technical field, and in particular to a kind of hydraulic safe electric control system.
Background technology
Hydraulic drive and Pneumatic Transmission are referred to as Fluid-transmission, are the hydrostatic pressure transmissions proposed according to the 17th century Pascal
Principle and an emerging technology growing up, are changed to oil in 1905 by working medium water, are further improved.For the first time
After hydraulic drive extensive use after world war, particularly nineteen twenty, develop more rapid.Hydraulic Elements are about in 19th century
Between 20 years of last 20 beginnings of the century, the regular industrial production stage is just initially entered.Nineteen twenty-five Vickers has invented pressure balance type
Vane pump, is that modern age Hydraulic Elements are industrial or hydraulicdriven progressively foundation is laid a good foundation.20 beginning of the century Constantine Nice
Gram carried out theory and practical study are transmitted to energy hunting；Before and after nineteen fifty-five, Japan develops hydraulic drive, 1956 rapidly
Year has set up " hydraulic industry meeting ".Between nearly 20~30 years, Japanese hydraulic drive development is fast, occupies first place in the world.Hydraulic pressure is passed
Dynamic have the advantages that many protrusions, therefore its application is widely, such as the plastic processing machinery of general industry, press,
Lathe etc.；Engineering machinery, building machinery, agricultural machinery, automobile in walking machine etc.；The metallurgical machinery of steel and iron industry, carry
Rise device, roll adjusting device etc.；The flood gate and dam installation of building hydraulic engineering, riverbed lowering or hoisting gear, bridge behaviour
Vertical mechanism etc.；Power plant turbine arrangements for speed regulation, nuclear power plant etc.；The deck crane tool of ship, fore door, bulkhead
Valve, stern propeller etc.；Huge antenna control device, measurement buoy, lifting rotation stage of special technique etc.；War industry
Cannon manipulation device, ship stabilizer, aerial vehicle simulation, the draw off gear of undercarriage and rudder control device
Deng.Hydraulic control system is to provide dynamic foundation with motor, and mechanical energy is converted into pressure using hydraulic pump, promotes hydraulic oil.
Change the flow direction of hydraulic oil by controlling various valves, so that promote hydraulic cylinder to make the action of different strokes, different directions, it is complete
Needed into the different action of various equipment.Existing hydraulic control system exist complex structure, cannot be to the operation of hydraulic system
The problems such as being monitored, is unfavorable for the use of hydraulic control system.In the patent document of Patent No. CN201510284756.8
In, disclose a kind of hydra-electric control system, including PLC, Oil pump electrical machinery group, power supply, magnetic valve, data processing module and prison
Survey module, the Oil pump electrical machinery group at least include two Oil pump electrical machineries, the power supply respectively with the PLC, Oil pump electrical machinery group and
Magnetic valve is connected, and is its power supply, and the PLC is connected with the magnetic valve and Oil pump electrical machinery group respectively, the Oil pump electrical machinery group according to
Secondary to meet PLC by monitoring modular and data processing module, the power supply is also connected with breaker, occurs asking in electric control system
During topic, power-off is forced.The ruuning situation of Oil pump electrical machinery group can be monitored by monitoring modular and data processing module, and
Monitoring result is passed into PLC, PLC can be flowed to by the hydraulic oil of solenoid valve control Oil pump electrical machinery group；With simple structure,
Using it is safe the advantages of.
Above-mentioned patent document can be carried out by monitoring modular and data processing module to the ruuning situation of Oil pump electrical machinery group
Monitoring, and monitoring result is passed into PLC, PLC can be flowed to by the hydraulic oil of solenoid valve control Oil pump electrical machinery group；With knot
Structure is simple, using it is safe the advantages of.But for how to provide one kind, simple structure, simple operation, security performance liquid higher
Pressure secured electrical control system lacks technical solution.
The content of the invention
(1) technical problem for solving
In view of the shortcomings of the prior art, the invention provides a kind of hydraulic safe electric control system, for solve how
There is provided a kind of, simple structure, simple operation, the problem of security performance hydraulic safe electric control system higher.
(2) technical scheme
To realize object above, the present invention is achieved by the following technical programs：
A kind of hydraulic safe electric control system, including Hydraulic Power Transmission System and electric control circuit, it is characterised in that：Institute
State hydraulic system of the Hydraulic Power Transmission System including unit head working cycles hydraulic system and hydraulic power slid platform, the electrical control
Circuit includes the control of unit head working cycles hydraulic system electric control circuit, delay circuit and hydraulic power slid platform automatic cycle
Circuit, the unit head in the unit head working cycles hydraulic system is driven by hydraulic cylinder YG, when unit head working cycles hydraulic pressure
When system electrical control circuit electromagnet 1YA, 2YA, 3YA are powered off, magnetic valve YV1 is in an intermediate position, and unit head stops not
It is dynamic, unit head in the original location when, limit switch SQ1 is pushed down by buting iron, and its moving together contact closure, break contact disconnects, in time delay electricity
Lu Zhong, after work enters terminal, pressing switch SQ3 makes time relay KT be powered, and its instantaneous break contact KT disconnects, and makes
1YA, 3YA power off, unit head stop work entering, after the setting time of arrival time relay, its timing closing closing of contact, make after
Electrical equipment KA3 time delays are connected electric, i.e. 2YA just starts rewind after being powered, and the hydraulic system of the hydraulic power slid platform includes power
Device, executing agency, control and regulation device and servicing unit.
Preferably, the hydraulic system of the hydraulic power slid platform includes following state and the course of work：
(1) slide unit transfixion：When hydraulic pump motor start-up works, if electromagnet coil YA1, YA2, YA3 are obstructed
When electric, pressure oil flows back to the piston of fuel tank-hydraulic cylinder through the intermediate stations of solenoid directional control valve YV1 (3 position-5 way solenoid directional control valve)
And slide unit transfixion；
(2) slide unit F.F.：Electromagnet coil YA1, YA3 are powered, the YA2 pressure oils that pump out of power-off oil pumps through YV1 left side
Station flows into hydraulic cylinder piston left chamber, and the oil return of piston right chamber also flows into hydraulic cylinder piston left chamber through YV2 left sides station, hydraulic cylinder
The F.F. from left to right of piston driving slide unit；
(3) slide unit work is entered：Electromagnet coil YA1 is powered, and YA2 power-off, solenoid directional control valve YV1 is still operated in left side station；
The electromagnet coil YA3 power-off of solenoid directional control valve YV2 is operated in right side station, and valve fluid path obstruction, hydraulic cylinder piston right chamber is returned
Oil has to pass through filter, choke valve and flows back to fuel tank, and back-flow velocity is suppressed, and the piston driving slide unit of hydraulic cylinder is from left-hand
The right side, is fed with mach speed；
(4) backstop iron is stopped：When slide unit work enters piston to be blocked by backstop iron, slide unit stagnation, oil pump continues work
Make, the pressure of oil is improved in pipeline, overflow valve is opened work, holding pipeline pressure is constant, and slide unit is stopped in short-term in end；
(5) slide unit rewind：When only electromagnet coil YA2 is powered, YV1 is operated in right side station, the pressure that oil pump is pumped out
Power oil enter hydraulic cylinder piston right chamber, left chamber return liquid directly through YV1 return fuel tank, the rewind from right to left of piston driving slide unit, soon
Depression stroke switch SQ1, powers off YA2 when falling back on original position, and slide unit is parked in original position.
Preferably, the hydraulic power slid platform automatic cyclic control circuit can realize manually and automatically 2 kinds of modes of operation,
Under automatic mode, often pressing one-shot button SB1 just can make power slide complete the working cycles of primary feed.
Preferably, the control process of the one action circulation is as follows：Workbench in the original location when depression stroke switch SQ1,
Change-over switch SA is closed to " automatic " position, presses start button SB1, and relay coil KA1 obtains electric self-locking, electromagnet coil YA1
It is powered with YA3, slide unit F.F.；When certain position depression stroke switch SQ2 is fast-forward to, make relay coil KA2 energization self-lockings,
Electromagnet coil YA3 power-off simultaneously, slide unit is changed into work and enters from F.F.；Work enter certain position depression stroke switch SQ3, the time after
Electric apparatus coil KT on-delay, when delay time is arrived, its moving together contact closure makes relay coil KA3 obtain electric self-locking, electromagnet
Coil YA1 is powered off, and electromagnet coil YA2 obtains electric, slide unit rewind；Depression stroke switch SQ1 in situ is fallen back on soon, makes relay coil
KA3 dead electricity, electromagnet coil YA2 dead electricity, slide unit is parked in original position, and one action circulation terminates, if entering process in F.F. or work
In, to press and return button SB2, slide unit stops after will quickly returning original position.
Preferably, under manual manipulation mode, change-over switch SA is closed to " manual " position, if pinning start button SB1
When, working slider feed motion；If press returning button SB2, slide unit stops after will quickly returning to original position.
Preferably, the hydraulic safe electric control system also includes hydraulic servo ratio system, and servo proportion passes through
The integrated amplifier for carrying, can continuously adjust the aperture of servo proportion, and this is the maximum with common hydraulic control one-way valve
Difference, because the aperture of servo proportion is continuously adjustabe, therefore the oily flow of supply oil cylinder is also continuously adjustabe, this
Sample is achieved that speed to oil cylinder, thrust continuously adjusting and controlling.
(3) beneficial effect
The present invention realizes speed to oil cylinder, thrust and continuously adjusting and controlling, simple structure, simple operation, safety
Performance is higher, with very strong creativeness.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the hydraulic system principle figure of hydraulic power slid platform of the invention；
Fig. 2 is hydraulic power slid platform automatic cyclic control circuit schematic diagram of the invention；
Fig. 3 is unit head working cycles hydraulic system principle figure of the invention；
Fig. 4 is unit head working cycles hydraulic system electric drawings of the invention；
Fig. 5 is delay circuit diagram of the invention；
Fig. 6 is hydraulic servo ratio system flow chart of the invention.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
A kind of hydraulic safe electric control system as shown in figures 1 to 6, including Hydraulic Power Transmission System and electric control circuit,
It is characterized in that：Hydraulic Power Transmission System includes the hydraulic system of unit head working cycles hydraulic system and hydraulic power slid platform, electricity
Gas control circuit is followed automatically including unit head working cycles hydraulic system electric control circuit, delay circuit and hydraulic power slid platform
Loop control circuit, the unit head in unit head working cycles hydraulic system is driven by hydraulic cylinder YG, when unit head working cycles liquid
When pressure system electrical control circuit electromagnet 1YA, 2YA, 3YA are powered off, magnetic valve YV1 is in an intermediate position, and unit head stops
It is motionless, unit head in the original location when, limit switch SQ1 is pushed down by buting iron, its moving together contact closure, break contact disconnect, in time delay
In circuit, after work enters terminal, pressing switch SQ3 makes time relay KT be powered, and its instantaneous break contact KT disconnects, and makes
1YA, 3YA power off, unit head stop work entering, after the setting time of arrival time relay, its timing closing closing of contact, make after
Electrical equipment KA3 time delays are connected electric, i.e. 2YA just starts rewind after being powered, the hydraulic system of hydraulic power slid platform include power set,
Executing agency, control and regulation device and servicing unit.
The hydraulic system of hydraulic power slid platform includes following state and the course of work：
(1) slide unit transfixion：When hydraulic pump motor start-up works, if electromagnet coil YA1, YA2, YA3 are obstructed
When electric, pressure oil flows back to the piston of fuel tank-hydraulic cylinder through the intermediate stations of solenoid directional control valve YV1 (3 position-5 way solenoid directional control valve)
And slide unit transfixion；
(2) slide unit F.F.：Electromagnet coil YA1, YA3 are powered, the YA2 pressure oils that pump out of power-off oil pumps through YV1 left side
Station flows into hydraulic cylinder piston left chamber, and the oil return of piston right chamber also flows into hydraulic cylinder piston left chamber through YV2 left sides station, hydraulic cylinder
The F.F. from left to right of piston driving slide unit；
(3) slide unit work is entered：Electromagnet coil YA1 is powered, and YA2 power-off, solenoid directional control valve YV1 is still operated in left side station；
The electromagnet coil YA3 power-off of solenoid directional control valve YV2 is operated in right side station, and valve fluid path obstruction, hydraulic cylinder piston right chamber is returned
Oil has to pass through filter, choke valve and flows back to fuel tank, and back-flow velocity is suppressed, and the piston driving slide unit of hydraulic cylinder is from left-hand
The right side, is fed with mach speed；
(4) backstop iron is stopped：When slide unit work enters piston to be blocked by backstop iron, slide unit stagnation, oil pump continues work
Make, the pressure of oil is improved in pipeline, overflow valve is opened work, holding pipeline pressure is constant, and slide unit is stopped in short-term in end；
(5) slide unit rewind：When only electromagnet coil YA2 is powered, YV1 is operated in right side station, the pressure that oil pump is pumped out
Power oil enter hydraulic cylinder piston right chamber, left chamber return liquid directly through YV1 return fuel tank, the rewind from right to left of piston driving slide unit, soon
Depression stroke switch SQ1, powers off YA2 when falling back on original position, and slide unit is parked in original position.
Hydraulic power slid platform automatic cyclic control circuit can realize manually and automatically 2 kinds of modes of operation, in the side of being automatically brought into operation
Under formula, often pressing one-shot button SB1 just can make power slide complete the working cycles of primary feed.
The control process of one action circulation is as follows：Workbench in the original location when depression stroke switch SQ1, change-over switch SA close
To " automatic " position, start button SB1 is pressed, relay coil KA1 obtains electric self-locking, and electromagnet coil YA1 and YA3 are powered, sliding
Platform F.F.；When certain position depression stroke switch SQ2 is fast-forward to, make relay coil KA2 energization self-lockings, while electromagnetism iron wire
Circle YA3 power-off, slide unit is changed into work and enters from F.F.；It is logical that work enters certain position depression stroke switch SQ3, time relay coil KT
Electric time delay, when delay time is arrived, its moving together contact closure makes relay coil KA3 obtain electric self-locking, and electromagnet coil YA1 is powered off,
Electromagnet coil YA2 obtains electric, slide unit rewind；Depression stroke switch SQ1 in situ is fallen back on soon, makes relay coil KA3 dead electricity, electromagnetism
Iron coil YA2 dead electricity, slide unit is parked in original position, and one action circulation terminates, if during F.F. or work are entered, press return by
Button SB2, slide unit stops after will quickly returning original position.
Under manual manipulation mode, change-over switch SA is closed to " manual " position, if pin start button SB1, work
Slide unit feed motion；If press returning button SB2, slide unit stops after will quickly returning to original position.
Hydraulic safe electric control system also includes hydraulic servo ratio system, and what servo proportion passed through to carry integrated puts
Big device, can continuously adjust the aperture of servo proportion, and this is maximum different from common hydraulic control one-way valve, due to servo
The aperture of proportioning valve is continuously adjustabe, therefore the oily flow of supply oil cylinder is also continuously adjustabe, and it is right to be so achieved that
The speed of oil cylinder, thrust continuously adjusting and controlling.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.And, term " including ", "comprising" or its any other variant be intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention has been described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent to which part technical characteristic；And these modification or
Replace, do not make the spirit and scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.
Claims (6)
1. a kind of hydraulic safe electric control system, including Hydraulic Power Transmission System and electric control circuit, it is characterised in that：It is described
Hydraulic Power Transmission System includes the hydraulic system of unit head working cycles hydraulic system and hydraulic power slid platform, the electric controling line
Road includes unit head working cycles hydraulic system electric control circuit, delay circuit and hydraulic power slid platform automatic cycle control electricity
Road, the unit head in the unit head working cycles hydraulic system is driven by hydraulic cylinder YG, when unit head working cycles hydraulic pressure system
When system electric control circuit electromagnet 1YA, 2YA, 3YA are powered off, magnetic valve YV1 is in an intermediate position, and unit head is slack,
Unit head in the original location when, limit switch SQ1 is pushed down by buting iron, its moving together contact closure, break contact disconnect, in delay circuit
In, after work enters terminal, pressing switch SQ3 makes time relay KT be powered, and its instantaneous break contact KT disconnects, make 1YA,
3YA is powered off, and unit head stops work and enters, and after the setting time of arrival time relay, its timing closing closing of contact makes relay
KA3 time delays are connected electric, i.e. 2YA just starts rewind after being powered, the hydraulic system of the hydraulic power slid platform include power set,
Executing agency, control and regulation device and servicing unit.
2. hydraulic safe electric control system according to claim 1, it is characterised in that：The liquid of the hydraulic power slid platform
Pressure system includes following state and the course of work：
(1) slide unit transfixion：When hydraulic pump motor start-up works, if during the equal no power of electromagnet coil YA1, YA2, YA3,
Pressure oil flows back to the piston and cunning of fuel tank-hydraulic cylinder through the intermediate stations of solenoid directional control valve YV1 (3 position-5 way solenoid directional control valve)
Platform transfixion；
(2) slide unit F.F.：Electromagnet coil YA1, YA3 are powered, the YA2 pressure oils that pump out of power-off oil pumps through YV1 left side station
Hydraulic cylinder piston left chamber is flowed into, the oil return of piston right chamber also flows into hydraulic cylinder piston left chamber, the piston of hydraulic cylinder through YV2 left sides station
Drive slide unit F.F. from left to right；
(3) slide unit work is entered：Electromagnet coil YA1 is powered, and YA2 power-off, solenoid directional control valve YV1 is still operated in left side station；Electromagnetism
The electromagnet coil YA3 power-off of reversal valve YV2 is operated in right side station, and the valve fluid path is blocked, and hydraulic cylinder piston right chamber oil return must
Fuel tank must be flowed back to by filter, choke valve, back-flow velocity is suppressed, the piston driving slide unit of hydraulic cylinder from left to right, with
Mach speed feeding；
(4) backstop iron is stopped：When slide unit work enters piston to be blocked by backstop iron, slide unit stagnation, oil pump works on, and manages
The pressure of oil is improved in road, overflow valve is opened work, and holding pipeline pressure is constant, and slide unit is stopped in short-term in end；
(5) slide unit rewind：When only electromagnet coil YA2 is powered, YV1 is operated in right side station, the pressure oil that oil pump is pumped out
Into hydraulic cylinder piston right chamber, left chamber is returned liquid and directly returns to fuel tank through YV1, and the rewind from right to left of piston driving slide unit falls back on soon
Depression stroke switch SQ1, powers off YA2 when in situ, and slide unit is parked in original position.
3. hydraulic safe electric control system according to claim 1, it is characterised in that：The hydraulic power slid platform is automatic
Circulating controling circuit can realize manually and automatically 2 kinds of modes of operation, under automatic mode, often press one-shot button
SB1 just can make power slide complete the working cycles of primary feed.
4. hydraulic safe electric control system according to claim 3, it is characterised in that：The control of the one action circulation
Process processed is as follows：Workbench in the original location when depression stroke switch SQ1, change-over switch SA closed to " automatic " position, press start by
Button SB1, relay coil KA1 obtain electric self-locking, and electromagnet coil YA1 and YA3 are powered, slide unit F.F.；When being fast-forward to certain position
During depression stroke switch SQ2, make relay coil KA2 energization self-lockings, while electromagnet coil YA3 is powered off, slide unit is become by F.F.
For work is entered；Work enter certain position depression stroke switch SQ3, time relay coil KT on-delay, when delay time is arrived, its
Moving together contact is closed, and relay coil KA3 is obtained electric self-locking, and electromagnet coil YA1 power-off, electromagnet coil YA2 obtains electric, slide unit
Rewind；Depression stroke switch SQ1 in situ being fallen back on soon, making relay coil KA3 dead electricity, electromagnet coil YA2 dead electricity, slide unit is parked in
Original position, one action circulation terminates, if during F.F. or work are entered, pressing and returning button SB2, slide unit will quickly be return
Stop behind original position.
5. hydraulic safe electric control system according to claim 3, it is characterised in that：Under manual manipulation mode, turn
Switch SA is changed to close to " manual " position, if pin start button SB1, working slider feed motion；If press return by
Button SB2, slide unit stops after will quickly returning to original position.
6. hydraulic safe electric control system according to claim 1, it is characterised in that：The hydraulic safe electrical control
System also includes hydraulic servo ratio system, and servo proportion passes through the integrated amplifier for carrying, can continuously adjust servo
The aperture of proportioning valve, this is maximum different from common hydraulic control one-way valve, because the aperture of servo proportion is continuously adjustabe
, therefore the oily flow of supply oil cylinder is also continuously adjustabe, is so achieved that speed, the continuous tune of thrust to oil cylinder
Section and control.
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| CN110211478A (en) * | 2019-04-24 | 2019-09-06 | 中广核核电运营有限公司 | A kind of hydraulic testing apparatus and test method |
| CN110239129A (en) * | 2019-05-30 | 2019-09-17 | 东莞盛翔精密金属有限公司 | A kind of pressing machine, control circuit and working method |
| CN112483489A (en) * | 2020-11-26 | 2021-03-12 | 常熟市电力机具有限公司 | Ultrahigh pressure hydraulic pump |
| CN112555209A (en) * | 2020-12-28 | 2021-03-26 | 上海康恒环境股份有限公司 | Electric control device for series-parallel switching of hydraulic oil circuit |
| CN113883254A (en) * | 2021-10-26 | 2022-01-04 | 睿瀚行(上海)新能源汽车技术有限公司 | Double-motor pure electric reduction box anti-suction system |
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