CN109915428A - A kind of double pump pre-tightened with pressure directly drives electricity hydrostatic actuator - Google Patents

A kind of double pump pre-tightened with pressure directly drives electricity hydrostatic actuator Download PDF

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Publication number
CN109915428A
CN109915428A CN201910217911.2A CN201910217911A CN109915428A CN 109915428 A CN109915428 A CN 109915428A CN 201910217911 A CN201910217911 A CN 201910217911A CN 109915428 A CN109915428 A CN 109915428A
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China
Prior art keywords
hydraulic
pump
valve
oil
pressure
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Pending
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CN201910217911.2A
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Chinese (zh)
Inventor
张树忠
刘喜涛
唐一文
练国富
陈丙三
晏岱
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Fujian University of Technology
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Fujian University of Technology
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Priority to CN201910217911.2A priority Critical patent/CN109915428A/en
Publication of CN109915428A publication Critical patent/CN109915428A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a kind of double pumps pre-tightened with pressure directly to drive electric hydrostatic actuator, it is related to hydraulic control system field, by the pressure preload unit for installing the compositions such as hydraulic pump, the unidirectional valve group of rectification, overflow valve additional, the pressure for providing low-pressure side for the straight Driving force system of the double pump pre-tightens, pass through the pressure preload unit, no matter hydraulic actuator is stretched out or is retracted (driving motor rotates forward or reversion), it can realize that the pressure of low pressure oil side pre-tightens, it is pre-tightened by the pressure of a small amount of flow, substantially increases the dynamic property of system.This system use simple, at low cost, good reliability the element of structure, realize with the substantially comparable performance of valve control system, not only high reliablity, maintenance are small but also energy saving.

Description

A kind of double pump pre-tightened with pressure directly drives electricity hydrostatic actuator
Technical field
The present invention relates to hydraulic control system fields more particularly to a kind of double pump pre-tightened with pressure directly to drive electric hydrostatic actuation Device.
Background technique
Currently, the hydraulic system of three categories maturation: common control system is primarily present by control form classification, ratio control System, servo-control system.Ratio control system and servo-control system are that a kind of stability is good, and dynamic response is fast, accuracy High automatic liquid pressure control system is mainly used in all kinds of medium-to-high grade hydraulic machineries and device, but its efficiency is lower, cost Height, and it is difficult in maintenance, use environment is required stringent.In production, the hydraulic system of many production equipments less requires it Response time, the performances such as speed, but need to carry out the running position of hydraulic system the automation control of closed loop;And common liquid Pressure control system is difficult to meet its such control characteristic requirement again, and existing hydraulic control system can not be taken into account well The hydraulic system characteristic requirements of such production equipment.
The straight electricity hydrostatic actuator system that drives is that hydraulic pump is driven to realize the control of position, speed etc. by servo motor. Its working principle is that controller issues control signal according to control instruction and sensor feedback, the revolving speed of motor is controlled, thus band Dynamic constant displacement pump controls output displacement, the speed of hydraulic cylinder to change revolving speed, direction of rotation, or the output flow by changing pump Degree, acceleration and power etc..But existing electricity hydrostatic actuator system is made of driving system servo motor, constant displacement pump and actuator System controls precision compared with valve control system, and dynamic property is relatively poor.
Summary of the invention
Object of the present invention is to for the shortcoming in the presence of the above-mentioned prior art, and provide it is a kind of for being displaced, speed The double pump electricity hydrostatic hydraulic actuation system of the controls such as degree, acceleration and power.According to the control principle of servo-control system, Ji Nengman Response time needed for the foot manufacturing, the performance requirements such as speed, and it is able to achieve the accurate control of actuator position, while compared with Valve control system increases substantially system energy efficiency.
Technical solution of the present invention is as follows: a kind of double pump pre-tightened with pressure directly drives electricity hydrostatic actuator, including hydraulic execution Element, displacement sensor, the first solenoid valve, second solenoid valve, the first check valve, second one-way valve, the first hydraulic pump, the second liquid Press pump, driving motor, frequency converter or driver, controller, power supply and hydraulic accumulator, the hydraulic actuator include separating The first oil pocket and the second oil pocket, institute's displacement sensors are arranged on the hydraulic actuator for detecting described hydraulic hold The displacement of the enforcement division of units, it is characterised in that: first oil pocket is connect with a hydraulic fluid port of first solenoid valve, institute It states the second oil pocket to connect with a hydraulic fluid port of the second solenoid valve, another hydraulic fluid port of first solenoid valve and described first The oil outlet of check valve connects, another hydraulic fluid port of the second solenoid valve is connect with the oil outlet of the second one-way valve, institute It states between the oil inlet of the first check valve and the oil inlet of the second one-way valve through oil inlet connection, first electromagnetism Another described hydraulic fluid port of valve is connect with a hydraulic fluid port of first hydraulic pump, another described oil of the second solenoid valve Mouth is connect with a hydraulic fluid port of second hydraulic pump, another hydraulic fluid port of first hydraulic pump and second hydraulic pump Another hydraulic fluid port is connected to each other and another hydraulic fluid port of another hydraulic fluid port of first hydraulic pump and second hydraulic pump is equal It is connect with the hydraulic accumulator, first hydraulic pump and the second hydraulic pump are driven by the driving motor is synchronous, the drive One pump oil direction is towards the hydraulic actuator in first hydraulic pump described in when dynamic motor work and the second hydraulic pump, and Another pump oil direction is connected to the frequency converter or drive backwards to the hydraulic actuator, the control terminal of the driving motor The power end of dynamic device, the frequency converter or driver is electrically connected to power supply, and the hydraulic accumulator is connected to by supercharging device The oil inlet route, the supercharging device are parallel with overflow valve, the oil inlet of the high-voltage end of the supercharging device and the overflow valve Mouthful connection, the low-pressure end of the supercharging device connect with the oil outlet of the overflow valve, the controller respectively with the displacement Sensor, first solenoid valve, the second solenoid valve and the frequency converter or driver electrical connection.
Further, the hydraulic actuator be hydraulic cylinder, the hydraulic cylinder by piston separate first oil pocket with Second oil pocket, the piston are connected with execution bar, and institute's displacement sensors are arranged on the hydraulic cylinder for detecting described hold The displacement of row bar.
Further, first solenoid valve, second solenoid valve are two-position two-way solenoid valve.
Further, first hydraulic pump, the second hydraulic pump power input shaft pass through shaft coupling and be connected to the drive The drive shaft of dynamic motor.
Further, the supercharging device include third hydraulic pump, third check valve, the 4th check valve, the 5th check valve and The power input shaft of 6th check valve, the third hydraulic pump is connected to the drive shaft of the driving motor, institute by shaft coupling The oil outlet of the oil outlet and the 4th check valve of stating third check valve be connected to each other and with the oil inlet route and described The oil inlet of overflow valve connects, and the oil inlet of the 5th check valve and the oil inlet of the 6th check valve are connected to each other simultaneously It is connect with the oil outlet of the hydraulic accumulator and the overflow valve, the oil inlet of the 5th check valve and the described 6th is unidirectionally The hydraulic fluid port that the oil inlet of valve is also connected to each other with first hydraulic pump and the second hydraulic pump is connect, the third check valve The oil outlet of oil inlet and the 5th check valve is connected to each other and connect with a hydraulic fluid port of the third hydraulic pump, described The oil outlet of the oil inlet of 4th check valve and the 6th check valve is connected to each other and another with the third hydraulic pump A hydraulic fluid port connection.
Further, the overflow valve is electricity liquid ratio relief valve, and the controller is electrically connected with the electricity liquid ratio relief valve It connects.
It further, further include pressure sensor, the pressure sensor is used to detect the pressure in the oil inlet route, institute Pressure sensor is stated to be electrically connected with the controller.
Further, the hydraulic accumulator can be substituted with fuel tank.
The beneficial effects of the present invention are: (1) pressure by install hydraulic pump, rectify the compositions such as unidirectional valve group, overflow valve Power preload unit, the pressure for providing low-pressure side for the straight Driving force system of the double pump pre-tightens, by the pressure preload unit, no matter liquid It presses executive component to stretch out or retract (driving motor is rotated forward or inverted), can realize that the pressure of low pressure oil side pre-tightens, pass through The pressure of a small amount of flow pre-tightens, and substantially increases the dynamic property of system.(2) this system is simple, at low cost, reliable using structure The good element of property, realize with the substantially comparable performance of valve control system, not only high reliablity, maintenance are small but also energy saving.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the double pump of the invention pre-tightened with pressure directly drives electric hydrostatic actuator.
Wherein;1- hydraulic actuator;2- displacement sensor;3- pressure sensor;The first solenoid valve of 4-;The second electromagnetism of 5- Valve;The first check valve of 6-;7- second one-way valve;8- overflow valve;9- third check valve;The 4th check valve of 10-;11- the 5th is unidirectional Valve;The 6th check valve of 12-;13- third hydraulic pump;The first hydraulic pump of 14-;15- driving motor;The second hydraulic pump of 16-;17- becomes Frequency device or driver;18- controller;19- power supply;20- hydraulic accumulator.
Specific embodiment
Brief description is made to a specific embodiment of the invention with reference to the accompanying drawing.
As shown in Figure 1, a kind of double pump pre-tightened with pressure directly drives electric hydrostatic actuator, including hydraulic actuator 1, displacement Sensor 2, the first solenoid valve 4, second solenoid valve 5, the first check valve 6, second one-way valve 7, the first hydraulic pump 14, second are hydraulic Pump 16, driving motor 15, frequency converter or driver 17, controller 18, power supply 19 and hydraulic accumulator 20.It is described hydraulic to execute member Part 1 includes the first oil pocket and the second oil pocket separated, and the setting of institute's displacement sensors 2 is used on the hydraulic actuator 1 Detect the displacement of the enforcement division of the hydraulic actuator 1;The hydraulic actuator 1 can be hydraulic cylinder or hydraulic motor, The preferred hydraulic actuator 1 is hydraulic cylinder, and the hydraulic cylinder separates first oil pocket and the second oil pocket by piston, The piston is connected with execution bar, and the enforcement division for executing bar as hydraulic actuator is stretched under the effect of piston Movement, institute's displacement sensors 2 are arranged on the hydraulic cylinder for detecting the displacement for executing bar.First solenoid valve 4, second solenoid valve 5 is controlled, preferred first solenoid valve 4, the second electromagnetism for opening or closing oil circuit by controller 18 Valve 5 is two-position two-way solenoid valve.The driving motor 15 can be variable-frequency motor or servo motor, when the driving motor 15 When for variable-frequency motor, the control of revolving speed is realized by frequency converter 17, when the driving motor 15 is servo motor, revolving speed Control realized by driver 17.The hydraulic accumulator 20 is used for oil storage, to hydraulic actuator fuel feeding or can be received back Oil, it is also possible to common fuel tank substitution.First oil pocket is connect with a hydraulic fluid port of first solenoid valve 4, second oil Chamber is connect with a hydraulic fluid port of the second solenoid valve 5, another hydraulic fluid port of first solenoid valve 4 and first check valve 6 oil outlet connection, another hydraulic fluid port of the second solenoid valve 5 connect with the oil outlet of the second one-way valve 7, and described the Pass through oil inlet connection, first solenoid valve between the oil inlet of one check valve 6 and the oil inlet of the second one-way valve 7 4 another described hydraulic fluid port is connect with a hydraulic fluid port of first hydraulic pump 14, the second solenoid valve 5 it is described another Hydraulic fluid port is connect with a hydraulic fluid port of second hydraulic pump 16, another hydraulic fluid port of first hydraulic pump 14 and second liquid Another hydraulic fluid port of press pump 16 is connected to each other and another hydraulic fluid port of first hydraulic pump 14 and second hydraulic pump 16 Another hydraulic fluid port is connect with the hydraulic accumulator 20, and first hydraulic pump 14 and the second hydraulic pump 16 are by the driving electricity The synchronous driving of machine 15, preferred first hydraulic pump 14, the second hydraulic pump 16 power input shaft pass through shaft coupling and connect Realize synchronous driving to the drive shaft of the driving motor 15, when the driving motor 15 works described in 14 He of the first hydraulic pump One pump oil direction is towards the hydraulic actuator 1 in second hydraulic pump 16, and another pump oil direction is backwards to described Hydraulic actuator 1, the control terminal of the driving motor 15 are connected to the frequency converter or driver 17, the frequency converter or drive The power end of dynamic device 17 is electrically connected to power supply 19 and is powered by power supply 19, the controller respectively with institute displacement sensors 2, described First solenoid valve 4, the second solenoid valve 5 and the frequency converter or driver 17 are electrically connected.According to need of work, work as needs The piston driving of the hydraulic cylinder of the actuator is arranged in the execution bar stretching of the first oil pocket side, and the controller 18 controls First solenoid valve 4, the second solenoid valve 5 are opened, and control the frequency converter or driver 17 drives the driving electric Machine 15 is rotated with first direction, the second oil pocket pump oil from second hydraulic pump 16 to hydraulic cylinder, first hydraulic pump 14 from The oil mass of the outside pump oil of the first oil pocket of hydraulic cylinder, first hydraulic pump 14 enters second hydraulic pump 16, there is more oil Amount then flows back into hydraulic accumulator 20, and inadequate side supplements oil mass from hydraulic accumulator 20 and enters, and the second oil pocket is high-pressure side, and first Oil pocket is low-pressure side, and the execution bar stretching in the first oil pocket side is arranged in the piston driving of driving hydraulic cylinder;The displacement sensing The displacement that device 2 detects piston executes the displacement of bar, and feeds back to controller and be used for closed-loop control, when moving to target position When, controller 18 controls first solenoid valve 4, the second solenoid valve 5 is closed, and driving motor 15 stops working.Opposite, According to need of work, when the execution bar retraction in the first oil pocket side is arranged in the piston driving for the hydraulic cylinder for needing the actuator When, the controller 18 controls first solenoid valve 4, the second solenoid valve 5 opens, and controls the frequency converter or driving Device 17 drives the driving motor 15 to rotate with second direction opposite to the first direction, and first hydraulic pump 14 is to liquid First oil pocket pump oil of cylinder pressure, second oil pocket outside pump oil of second hydraulic pump 16 from hydraulic cylinder, second hydraulic pump 16 oil mass enters first hydraulic pump 14, has more oil masses then to flow back into hydraulic accumulator 20, and inadequate side is from hydraulic energy-accumulating Device 20 supplements oil mass and enters, and the first oil pocket is high-pressure side, and the second oil pocket is low-pressure side, and the piston driving setting of driving hydraulic cylinder exists Execution bar in the first oil pocket side retracts;The displacement that institute's displacement sensors 2 detect piston executes the displacement of bar, and feeds back and arrive Controller is used for closed-loop control, and when moving to target position, controller 18 controls first solenoid valve 4, second electricity Magnet valve 5 is closed, and driving motor 15 stops working.
The hydraulic accumulator 20 is connected to the oil inlet route by supercharging device, and the supercharging device is parallel with overflow Valve 8, the high-voltage end of the supercharging device are connect with the oil inlet of the overflow valve 8, the low-pressure end of the supercharging device with it is described The oil outlet of overflow valve 8 connects.The overflow valve 8 is for controlling oil pressure relief, when the boost pressure of supercharging device is greater than overflow When pressure, the oil of pressurization is back to accumulator 20 from overflow valve 8, when the actuator stretching motion, controls the increasing of supercharging device Pressure pressure and oil pressure relief guarantee the high-voltage end of supercharging device, i.e., at the pressure in the oil inlet end of overflow valve 8 and oil inlet route Between the first oil pocket and the pressure of the second oil pocket.The pressure preload unit being made up of supercharging device and overflow valve 8, no matter liquid It presses executive component 1 to stretch out or retract (driving motor 17 is rotated forward or inverted), oil inlet line is supplied to by pressure preload unit The certain oil mass in road flows into low-pressure side from the first check valve 6 or the oil inlet of second one-way valve 7, realizes the pressure of low pressure oil pocket side It pre-tightens, quickly puts aside the pressure of high-voltage oil cavity side, substantially increase the dynamic property of system.
It is any can be realized the oil of hydraulic accumulator 20 is boosted to meet pressure requirements after be supplied to the oil inlet route All within the scope of the present invention.Particularly, the supercharging device includes third hydraulic pump 13, the 9, the 4th list of third check valve To valve 10, the 5th check valve 11 and the 6th check valve 12, the power input shaft of the third hydraulic pump 13 is connected by shaft coupling To the drive shaft of the driving motor 15, therefore the third hydraulic pump 13 and first hydraulic pump 14 and described second hydraulic Pump 16 all by the synchronous driving of driving motor 15, the oil outlet of the third check valve 9 and the 4th check valve 10 it is fuel-displaced Mouth is connected to each other and connect with the oil inlet of the oil inlet route and the overflow valve 8, the oil inlet of the 5th check valve 11 Mouthful and the oil inlet of the 6th check valve 12 be connected to each other and fuel-displaced with the hydraulic accumulator 20 and the overflow valve 8 The oil inlet of mouthful connection, the oil inlet of the 5th check valve 11 and the 6th check valve 12 also with first hydraulic pump 14 hydraulic fluid ports being connected to each other with the second hydraulic pump 16 connect, the oil inlet of the third check valve 9 and the 5th check valve 11 Oil outlet be connected to each other and connect with a hydraulic fluid port of the third hydraulic pump 13, the oil inlet of the 4th check valve 10 It is connected to each other with the oil outlet of the 6th check valve 12 and is connect with another hydraulic fluid port of the third hydraulic pump 13.Pass through The setting of rectification unidirectional valve group and third hydraulic pump 13 that check valve 9-12 is constituted, no matter driving motor 15 is with described first Direction rotation is still rotated with the second direction, and the oil in hydraulic accumulator 20 can pass through the 6th check valve 12- third liquid The route of the 4th check valve 10 of the route of press pump 13- third check valve 9 or the 5th check valve 11- third hydraulic pump 13- enters institute State feed line.The supercharging device structure is simple, at low cost, good reliability, and the actuator with above-mentioned supercharging device realizes With the substantially comparable performance of valve control system, not only high reliablity, maintenance are small but also energy saving.
Any overflow valve that can be realized control and regulation oil pressure relief function is all within the scope of the present invention.It is preferred that , the overflow valve 8 is electricity liquid ratio relief valve, and the controller 18 is electrically connected with the electricity liquid ratio relief valve, passes through control Device 18 processed controls to adjust the oil pressure relief of overflow valve 8.
It further include pressure sensor 3, the pressure sensor 3 is used to detect the pressure in the oil inlet route, the pressure Force snesor 3 is electrically connected with the controller 18, and the oil pressure in the oil inlet route detected is fed back to control by pressure sensor 3 Device 18, controller 18 is by controlling to adjust the revolving speed of driving motor 15 or the oil pressure relief of overflow valve 8 to the oil in oil inlet route Pressure carries out closed-loop control.
The present invention is not limited to above-mentioned specific embodiment, and the invention may be variously modified and varied.All foundations Technical spirit of the invention should be included in the present invention to embodiment of above any modification, equivalent replacement, improvement and so on Protection scope.

Claims (8)

1. a kind of double pump pre-tightened with pressure directly drives electricity hydrostatic actuator, including hydraulic actuator (1), displacement sensor (2), First solenoid valve (4), second solenoid valve (5), the first check valve (6), second one-way valve (7), the first hydraulic pump (14), the second liquid Press pump (16), driving motor (15), frequency converter or driver (17), controller (18), power supply (19) and hydraulic accumulator (20), The hydraulic actuator (1) includes the first oil pocket and the second oil pocket separated, and institute's displacement sensors (2) are arranged in the liquid For detecting the displacement of the enforcement division of the hydraulic actuator (1) in pressure executive component (1), it is characterised in that: described first Oil pocket is connect with a hydraulic fluid port of first solenoid valve (4), an oil of second oil pocket and the second solenoid valve (5) Mouth connection, another hydraulic fluid port of first solenoid valve (4) are connect with the oil outlet of first check valve (6), and described second Another hydraulic fluid port of solenoid valve (5) is connect with the oil outlet of the second one-way valve (7), the oil inlet of first check valve (6) Mouthful with the oil inlet of the second one-way valve (7) between pass through oil inlet connection, first solenoid valve (4) it is described another A hydraulic fluid port is connect with a hydraulic fluid port of first hydraulic pump (14), another described hydraulic fluid port of the second solenoid valve (5) with One hydraulic fluid port of second hydraulic pump (16) connects, another hydraulic fluid port of first hydraulic pump (14) and described second hydraulic Another hydraulic fluid port of pump (16) is connected to each other and another hydraulic fluid port of first hydraulic pump (14) and second hydraulic pump (16) another hydraulic fluid port is connect with the hydraulic accumulator (20), first hydraulic pump (14) and the second hydraulic pump (16) Driven by the driving motor (15) are synchronous, when the driving motor (15) works described in the first hydraulic pump (14) and second hydraulic One pump oil direction is towards the hydraulic actuator (1) in pump (16), and another pump oil direction is backwards to described hydraulic Executive component (1), the control terminal of the driving motor (15) are connected to the frequency converter or driver (17), the frequency converter or The power end of driver (17) is electrically connected to power supply (19), the hydraulic accumulator (20) by supercharging device be connected to it is described into Oily route, the supercharging device are parallel with overflow valve (8), the oil inlet of the high-voltage end of the supercharging device and the overflow valve (8) Mouthful connection, the low-pressure end of the supercharging device connect with the oil outlet of the overflow valve (8), the controller (18) respectively with institute Displacement sensors (2), first solenoid valve (4), the second solenoid valve (5) and the frequency converter or driver (17) Electrical connection.
2. the double pump according to claim 1 pre-tightened with pressure directly drives electric hydrostatic actuator, which is characterized in that described hydraulic Executive component (1) is hydraulic cylinder, and the hydraulic cylinder separates first oil pocket and the second oil pocket, the piston connection by piston There is execution bar, institute's displacement sensors (2) are arranged on the hydraulic cylinder for detecting the displacement for executing bar.
3. the double pump according to claim 1 pre-tightened with pressure directly drives electric hydrostatic actuator, which is characterized in that described first Solenoid valve (4), second solenoid valve (5) are two-position two-way solenoid valve.
4. the double pump according to claim 1 pre-tightened with pressure directly drives electric hydrostatic actuator, which is characterized in that described first Hydraulic pump (14), the second hydraulic pump (16) power input shaft pass through the driving that shaft coupling is connected to the driving motor (15) Axis.
5. the double pump according to claim 1 pre-tightened with pressure directly drives electric hydrostatic actuator, which is characterized in that the pressurization Device includes that third hydraulic pump (13), third check valve (9), the 4th check valve (10), the 5th check valve (11) and the 6th are unidirectional The power input shaft of valve (12), the third hydraulic pump (13) is connected to the driving of the driving motor (15) by shaft coupling Axis, the oil outlet of the third check valve (9) and the oil outlet of the 4th check valve (10) be connected to each other and with it is described into Oily route is connected with the oil inlet of the overflow valve (8), the oil inlet and the 6th check valve of the 5th check valve (11) (12) oil inlet is connected to each other and connect with the oil outlet of the hydraulic accumulator (20) and the overflow valve (8), described The oil inlet of 5th check valve (11) and the oil inlet of the 6th check valve (12) also with first hydraulic pump (14) and The hydraulic fluid port connection that second hydraulic pump (16) is connected to each other, the oil inlet and the 5th check valve of the third check valve (9) (11) oil outlet is connected to each other and connect with a hydraulic fluid port of the third hydraulic pump (13), the 4th check valve (10) Oil inlet and the 6th check valve (12) oil outlet be connected to each other and with the third hydraulic pump (13) another Hydraulic fluid port connection.
6. the double pump according to claim 5 pre-tightened with pressure directly drives electric hydrostatic actuator, which is characterized in that the overflow Valve (8) is electricity liquid ratio relief valve (8), and the controller (18) is electrically connected with the electricity liquid ratio relief valve (8).
7. the double pump according to claim 6 pre-tightened with pressure directly drives electric hydrostatic actuator, which is characterized in that further include pressure Force snesor (3), the pressure sensor (3) are used to detect pressure in the oil inlet route, the pressure sensor (3) with Controller (18) electrical connection.
8. the double pump according to claim 1 pre-tightened with pressure directly drives electric hydrostatic actuator, which is characterized in that described hydraulic Accumulator (20) can be substituted with fuel tank.
CN201910217911.2A 2019-03-21 2019-03-21 A kind of double pump pre-tightened with pressure directly drives electricity hydrostatic actuator Pending CN109915428A (en)

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CN201910217911.2A CN109915428A (en) 2019-03-21 2019-03-21 A kind of double pump pre-tightened with pressure directly drives electricity hydrostatic actuator

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CN201910217911.2A CN109915428A (en) 2019-03-21 2019-03-21 A kind of double pump pre-tightened with pressure directly drives electricity hydrostatic actuator

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Application publication date: 20190621