CN106640792A - Direct-drive type electro-hydraulic servo system for asymmetric servo cylinder press - Google Patents
Direct-drive type electro-hydraulic servo system for asymmetric servo cylinder press Download PDFInfo
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- CN106640792A CN106640792A CN201611220447.5A CN201611220447A CN106640792A CN 106640792 A CN106640792 A CN 106640792A CN 201611220447 A CN201611220447 A CN 201611220447A CN 106640792 A CN106640792 A CN 106640792A
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- fuel tank
- hydraulic cylinder
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Classifications
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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
- F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
- F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
- F15B9/03—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type with electrical control means
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
- F15B13/0444—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors with rotary electric motor
-
- 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
- F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
- F15B7/06—Details
- F15B7/10—Compensation of the liquid content in a system
-
- 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
- F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
- F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
- F15B9/04—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by varying the output of a pump with variable capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20515—Electric motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20561—Type of pump reversible
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention belongs to the field of hydraulic presses and lifting equipment and provides a direct-drive type electro-hydraulic servo system for an asymmetric servo cylinder press. The direct-drive type electro-hydraulic servo system comprises an information collecting system, a controller, a servo driver, an overhead oil tank, a gravity pull-down type asymmetric servo cylinder, a servo motor and a two-way fixed displacement pump. According to the direct-drive type electro-hydraulic servo system, the principle of variable speed volume velocity regulation is adopted, closed loop control over the rotation speed of the servo motor is achieved through pressure feedback and position feedback, match of the output flow of the pump and the speed of a piston rod of the asymmetric servo cylinder under different work conditions is achieved, the number of control valves is reduced due to application of a pump control valveless loop, and the fault rate of the system is lowered; and it is indicated by tests and simulating calculation that compared with a valve control throttling overflow system with a one-way fixed displacement pump driven by an asynchronous motor, by means of the system, the efficiency is improved by about 80%, energy saving exceeds 70%, the impact nose is lowered by 60%-90%, and the direct-drive type electro-hydraulic servo system can be widely applied to smoked sheet pre-compaction packaging machines, injection molding machines, forging machines, lifting platforms and the like.
Description
Technical field
The invention belongs to hydraulic press and jacking equipment field, and in particular to one kind is applied to asymmetric servo cylinder press
Direct Drive Electro-hydraulic Servo System.
Background technology
At present, in asymmetric servo cylinder hydraulic circuit, executing agency is realized by the volume adjustment of choke valve or pump
Matching relationship between speed and power source output flow, can meet basic real requirement.But Metering Flow Control Circuits caloric value
Greatly, efficiency is low, and system noise is big, bulky；The speed control system with adjustable displacement complex structure of pump, requires fluid higher, motor sky
Turn loss big.Although existing electric-motor pump integrated technique, variable frequency volume speed adjusting technique, servomotor pump technology solve conventional hydraulic
Power source poor efficiency, high energy consumption, the problem of HI high impact.But due to two chamber difference in volume of asymmetric servo cylinder, it is difficult to realize enclosed
Or half-closed valveless loop, it is general still using traditional quantitative pump valve control loop or variable pump pump control loop.Servo electricity
Pump has successful Application on injection machine, but due to the restriction of oil suction pressure, servomotor cannot accomplish bidirectional rotation, loop
In there is still a need for configuration choke valve, the control valve such as reversal valve, however it remains restriction loss and reversing impact.
The content of the invention
The purpose of the present invention is exactly to overcome deficiency of the prior art, there is provided one kind is applied to asymmetric servo cylinder pressure
The Direct Drive Electro-hydraulic Servo System of machine, using servomotor the variable speed volumetric speed control principle of two-way quantitative pump is driven, by pressure
Force feedback, position feedback closed loop control servomotor rotating speed to change the output flow of two-way pump, to adapt to gravity pull-down list
Speed of the rod hydraulic cylinder piston rod under various operating modes, using half-closed hydraulic circuit, it is to avoid use throttle grverning
With overflow pressure regulation, a large amount of energy losses of pressurize；Using the valveless loop of pump control, it is to avoid reversing impact.
The purpose of the present invention is realized by following technical measures：A kind of direct-drive type for being applied to asymmetric servo cylinder press
Electrohydraulic servo system, it include information acquisition system, controller, servo-driver, servomotor, two-way quantitative pump, hydraulic cylinder,
Fuel tank, wherein, hydraulic cylinder is gravity pull-down asymmetric servo cylinder；
Described information acquisition system includes rod chamber pressure sensor, rodless cavity pressure sensor and piston rod displacement transducer,
The rod chamber pressure sensor is connected to the rod chamber of hydraulic cylinder, rodless cavity pressure sensor be connected to hydraulic cylinder without bar
Chamber, the piston rod displacement transducer is threadingly attached to hydraulic cylinder tail end；Wherein, rod chamber pressure sensor is used to gather
The oil circuit pressure value of the rod chamber of hydraulic cylinder is connected to, rodless cavity pressure sensor is used for collection and is connected to hydraulic cylinder rodless cavity
Oil circuit pressure value.
The signal input part of the controller respectively with rod chamber pressure sensor, rodless cavity pressure sensor, piston rod
Displacement transducer connects；For receiving pressure value signal, the collection of rodless cavity pressure sensor of the collection of rod chamber pressure sensor
Pressure value signal, piston rod displacement transducer collection hydraulic cylinder piston rod displacement signal, and produce servomotor driving
Command signal.
The signal input part of the servo-driver is connected with the signal output part of controller, its output end and servomotor
Connection.
The servomotor is connected with the UVW output ends of servo-driver；The controller to servo-driver output is watched
Motor drive command signal is taken, the servo-driver controls the action of servomotor according to servomotor driving instruction signal.
The hydraulic fluid port A of the two-way quantitative pump is connected with the rodless cavity of hydraulic cylinder, the two-way of hydraulic fluid port B the first solenoid valve controls of Jing
Inserted valve is connected with the rod chamber of hydraulic cylinder.
The fuel tank Jing oil absorption filters and hydraulic control one-way valve are connected with the hydraulic fluid port B of two-way quantitative pump, fuel tank Jing replenishing valves
And the first check valve in parallel is connected with the rodless cavity of hydraulic cylinder.
The rodless cavity of the hydraulic cylinder connects fuel tank by replenishing valve.
When piston rod it is descending, and only piston rod self gravitation and pressure head gravity load, fuel tank Jing check valves and replenishing valve
To oil cylinder rodless cavity repairing；When piston rod is up, the unnecessary fluid Jing replenishing valves of rodless cavity and return filter return to fuel tank.
In above-mentioned technical proposal, the fuel tank is arranged on one 5 to 20 meters high of pylon or platform, increased fuel tank
To the pressure of two-way pump hydraulic fluid port B, the self absorption pressure under its higher rotation speed is disclosure satisfy that.
In above-mentioned technical proposal, in the application scenario that flow system flow is larger, the rod chamber and rodless cavity Jing of hydraulic cylinder rise
The second magnetic valve connection of on-off action, forms differential circuit.Close in the replenishing valve of hydraulic cylinder rodless cavity connection, two-way pump
Hydraulic fluid port B Jing hydraulic control one-way valves and oil absorption filter from fuel tank oil suction when, the second magnetic valve for controlling differential circuit break-make is opened, and is had
The fluid of rod cavity returns to rodless cavity.
In above-mentioned technical proposal, oil suction is installed on the inlet line of the hydraulic fluid port B of two-way quantitative pump from fuel tank and is filtered
Device, is provided with return filter on the return line from hydraulic cylinder to fuel tank, oil absorption filter is coarse filtration, and return filter is
Essence is filtered.
In above-mentioned technical proposal, the oil circuit Jing second of the rodless cavity of the hydraulic fluid port A connection liquid cylinder pressures of two-way quantitative pump is unidirectional
Valve and safety valve are connected to fuel tank；The oil circuit of the rod chamber of hydraulic fluid port B connection liquid cylinder pressures connects through the 3rd check valve and safety valve
To fuel tank.
In above-mentioned technical proposal, the adjustable stroke in four positions is provided with the stroke of the piston rod of hydraulic cylinder and is opened
Close, the signal output part of travel switch is connected with controller.
In above-mentioned technical proposal, servomotor is provided with encoder, signal output part and the servo electricity of servo-driver
The encoder connection of machine.
Compared with prior art, the beneficial effects of the present invention is：
Using variable speed volumetric speed control principle, closed-loop control servomotor rotating speed is realized by pressure feedback, position feedback, realized
The output flow of pump and the speeds match of hydraulic cylinder piston rod, reduce the throttling and spill losses of system under different operating modes.Piston
The speed of bar can start moment, piston rod speedup and slow down moment, by the acceleration of controlled motor with step-less adjustment in system
Curve can at utmost reduce the impact noise of system.Realize that oil cylinder is lived by the rotating of servomotor and two-way quantitative pump
The commutation of stopper rod, it is to avoid reversing impact is produced using reversal valve.Closed circuit is applied to into gravity pull-down list rod hydraulic pressure
Cylinder, realize carries out repairing not against slippage pump and pressure oil tank to hydraulic cylinder and pump, while decreasing recirculating oil quantity, reduces
The volume of required fuel tank.In the piston rod free-falling stage, motor is in generating operation mode, by power supply feedback or resistance for dissipation
Shift the portion of energy, it is to avoid make Hydraulic System Fever using choke valve.In pressurize and off-load stage, by pressure feedback
Control, hydraulic pump almost can shut down, and high degree reduces the spill losses of system.The application in pump control valveless loop, is reduced
The quantity of control valve, reduces the fault rate of system.Jing is tested and simulation calculation shows, the system is driven compared to asynchronous machine
The valve control throttling overflow system of dynamic unidirectional constant displacement pump, improved efficiency 80% or so, more than 70%, impact noise reduces 60%- to energy-conservation
90%, can be widely applied to smoked sheet precompressed baling press, injection machine, forging machine, hoistable platform etc..
Description of the drawings
Fig. 1 is the theory diagram of the Direct Drive Electro-hydraulic Servo System that the present invention is applied to asymmetric servo cylinder press.
Wherein, the 1, the 3rd check valve；2nd, safety valve；3rd, two-way quantitative pump；4th, the second check valve；5th, hydraulic control one-way valve；6、
Servomotor；7th, the first magnetic valve；8th, rod chamber pressure sensor；9th, the second magnetic valve；10th, fuel tank；11st, the first check valve；
12nd, replenishing valve；13rd, oil absorption filter；14th, piston rod displacement transducer；15th, return filter；16th, rodless cavity pressure sensing
Device；17th, two-way plug-in valve；18th, servo-driver；19th, hydraulic cylinder；20th, the first travel switch；21st, controller；22nd, information is adopted
Collecting system；23rd, encoder；24th, the second travel switch；25th, third trip switch；26th, fourth line journey switch.
Specific embodiment
In order that the technology of the present invention feature, feature, technique effect, purpose of design are it is more readily appreciated that with reference to legend pair
The present invention is further elaborated.
As shown in figure 1, the embodiment of the present invention provides a kind of direct drive type electrohydraulic servo for being applied to asymmetric servo cylinder press
System, it includes：
Information acquisition system 22, described information acquisition system 22 includes rod chamber pressure sensor 8, rodless cavity pressure sensor 16
With piston rod displacement transducer 14.Wherein, rod chamber pressure sensor 8 is used for the oil that collection is connected to the rod chamber of hydraulic cylinder 19
Road pressure value, rodless cavity pressure sensor 16 is used for the oil circuit pressure value that collection is connected to the rodless cavity of hydraulic cylinder 19.
Controller 21, the signal input part of the controller 21 is passed respectively with rod chamber pressure sensor 8, rodless cavity pressure
Sensor 16, the connection of piston rod displacement transducer 14, travel switch, for receiving the pressure value of the collection of rod chamber pressure sensor 8
Signal, the pressure value signal of rodless cavity pressure sensor collection 16, the hydraulic cylinder piston rod of the collection of piston rod displacement transducer 14
Displacement signal and travel switch collection piston rod position signal, and produce servomotor driving instruction signal.
Servo-driver 18, the signal input part of the servo-driver 18 is connected with the signal output part of controller 21,
Its output end is connected with the encoder 23 of servomotor 6.
Servomotor 6, the servomotor 6 is connected with the UVW output ends of servo-driver 18.Controller 21 to servo is driven
Dynamic device 18 exports servomotor driving instruction signal, and servo-driver 18 controls servo electricity according to servomotor driving instruction signal
The action of machine 6.
Two-way quantitative pump 3, the hydraulic fluid port A of the two-way quantitative pump 3 is connected with the rodless cavity of hydraulic cylinder 19, hydraulic fluid port B Jing first
The two-way plug-in valve 17 of the control of magnetic valve 7 is connected with the rod chamber of hydraulic cylinder 19；The Jing oil absorption filters 13 of fuel tank 10 and hydraulic control list
It is connected with the hydraulic fluid port B of two-way quantitative pump 3 to valve 5, the rodless cavity of Jing replenishing valves 12 and the first check valve 11 in parallel and hydraulic cylinder 19
Connection.
Hydraulic cylinder 19, the hydraulic cylinder 19 is gravity pull-down asymmetric servo cylinder, and the rodless cavity of the hydraulic cylinder 19 passes through
Replenishing valve 12 connects fuel tank 10, when piston rod it is descending, and only piston rod self gravitation and pressure head gravity load, the Jing of fuel tank 10 the
One check valve 11 and replenishing valve 12 are to the rodless cavity repairing of hydraulic cylinder 19.When piston rod it is up, the unnecessary fluid Jing topping ups of rodless cavity
Valve 12 and return filter 15 return to fuel tank.
Fuel tank 10, the fuel tank 10 is arranged on one 5 to 20 meters high of pylon or platform, be increased fuel tank 10 and is arrived two-way
The pressure of the hydraulic fluid port B of constant displacement pump 3, disclosure satisfy that the self absorption pressure under its higher rotation speed.
In order that system adapts to the larger application scenario of flow, the rod chamber and rodless cavity Jing of hydraulic cylinder 19 play on-off action
The second magnetic valve 9 connect, formed differential circuit.The replenishing valve 12 connected in the rodless cavity of hydraulic cylinder is closed, two-way quantitative pump 3
Hydraulic fluid port B Jing hydraulic control one-way valves 5 and oil absorption filter 13 from 10 oil suction of fuel tank when, control differential circuit break-make the second magnetic valve
9 obtain electric, and the dead electricity of the first magnetic valve 7, the fluid of rod chamber returns to rodless cavity.
In order to make up two chamber difference in volume of asymmetric servo cylinder not against slippage pump or pressure oil tank, using more simple
From oil suction repairing technology, fuel tank 10 is arranged on 5 to 20 meters high of pylon or platform, a point two-way carries out repairing to system：
Arrive the rodless cavity of hydraulic cylinder 19 for the first check valves of Jing 11 of fuel tank 10 and replenishing valve 12 all the way；Another road is the Jing oil suctions of fuel tank 10
Filter 13 and hydraulic control one-way valve 5 arrive the hydraulic fluid port B of two-way quantitative pump 3.
In order to carry out filtration treatment to the impurity in fluid, from fuel tank 10 to the inlet line of the hydraulic fluid port B of two-way quantitative pump 3 on
Oil absorption filter 13 is installed, return filter 15 is installed on the return line of fuel tank 10 from hydraulic cylinder 19.Inhale to reduce
Oil pressure loses, and oil absorption filter 13 is coarse filtration；To ensure the filtering accuracy of system, return filter 15 is essence filtration.Liquid
Closure of check ring during 19 rodless cavity oil suction of cylinder pressure in return filter 15, the first check valve 11 is opened；The rodless cavity of hydraulic cylinder 19
During oil return, the check-valves in return filter 15 is opened, and the first check valve 11 is closed, and a part of fluid is through two-way quantitative pump 3
Rod chamber is returned to, a part of Jing return filters 15 return to fuel tank.
For the too high pressure peak under some emergency cases of anti-locking system to oil circuit in components and parts and joint produce damage
Evil, second check valves of oil circuit Jing 4 and safety valve 2 of the rodless cavity of 3 hydraulic fluid port A connection liquid cylinder pressures of two-way quantitative pump 19 are connected to fuel tank
10；The oil circuit of the rod chamber of hydraulic fluid port B connection liquid cylinder pressures 19 is connected to fuel tank 10 through the 3rd check valve 1 and safety valve 2.
It is upper in order under shutdown or holding state, the piston rod and pressure head of hydraulic cylinder 19 are suspended on, in rod chamber
The two-way plug-in valve 17 of the control of the first magnetic valve 7 is connected with the oil circuit of the hydraulic fluid port B of two-way quantitative pump 3.
In order to ensure piston rod consistent accelerating sections, braking section, quick target phase and at a slow speed in motion process
Target phase, is disposed with the adjustable and of travel switch 20,24,25 in four positions in the stroke of the piston rod of hydraulic cylinder 19
26.The signal output part of travel switch is connected with controller 21, so that controller 21 sends different according to the position of piston rod
Servomotor rotating speed control instruction.
Servomotor 6 is provided with encoder 23, and encoder 23 has the rotating speed control that reception servo-driver 18 sends
Instruction and the function of the current tach signal of feedback servo motor.
The operation principle of the present invention is as follows：
The original state of system is：The rotating speed of servomotor 6 is 0, and the dead electricity of the first magnetic valve 7, two-way plug-in valve 17 is in closing shape
State, the dead electricity of the second magnetic valve 9, differential circuit disconnects, and hydraulic cylinder piston rod is in contraction state, and pressure head is suspended on upper.
During system starts, the first magnetic valve 7 obtains electric, and two-way plug-in valve 17 is opened.In order to avoid starting impact, servo
Motor 6 is started with certain acceleration, and the rod chamber fluid of hydraulic cylinder 19 returns to rodless cavity via two-way quantitative pump 3.Due to two
Chamber difference in volume, rodless cavity forms negative pressure, and the check valve 11 of replenishing valve 12 and first is opened, and fuel tank 10 is to rodless cavity repairing.The stage
Piston rod and pressure head free-falling, by the rotating speed of servomotor 6 its downstream rate is controlled.
When pressure head is touched by compressor, the opposition of pressure head is gradually increased by compressor, hydraulic cylinder 19 has bar
The pressure in chamber is gradually reduced, and until hydraulic control one-way valve 5 is opened, fuel tank is connected with the hydraulic fluid port B of two-way quantitative pump 3；Hydraulic cylinder 19 is without bar
The pressure in chamber gradually increases, until replenishing valve 12 is closed.The Jing hydraulic control one-way valves 5 of two-way quantitative pump 3 and oil absorption filter 13 are from oil
Case oil suction.Second magnetic valve 9 obtains electric, the dead electricity of the first magnetic valve 7, differential circuit connection.Rod chamber pressure is with by compressor
Volume reduces and gradually increases, and system enters the slow pressure stage.Particularly, it is not very big application scenario in flow system flow, Ke Yiqu
The differential circuit of the second magnetic valve 9 that disappears control, and keep the first magnetic valve 7 to obtain electric in the stage.
In the slow pressure stage, information acquisition system obtains in real time two cavity pressures of hydraulic cylinder 19, and controller 21 is according to hydraulic cylinder
19 rodless cavity pressure value output servomotor speed controling signal, forms pressure feedback closed-loop control.When pressure head is depressed into
Triple-travel switchs 25 locations, and controller 21 starts to slow down servomotor 6, until pressure head reaches fourth line journey and opens
Close 26 positions, motor stalls, the control of forming position feedback closed loop.
When pressure head goes downwards to fourth line journey 26 position of switch, servomotor 6 stops operating, due to pump, oil cylinder etc.
Leakage, rodless cavity pressure is gradually reduced, and slow bounce-back occurs in ram position.According to information acquisition system 22, controller 21 is exported
Servomotor speed controling signal, makes system pressure and ram position come back to given level, and servomotor is shut down again.It is logical
Cross the circulation of above-mentioned action, it is possible to achieve system without overflow pressurize.
After pressurize terminates, the dead electricity of the second magnetic valve 9, the first magnetic valve 7 obtains electric, and servomotor 6 is inverted, and hydraulic cylinder 19 has bar
Cavity pressure is opened replenishing valve 12 by oil circuit control；The a part of hydraulic oil Jing replenishing valves 12 of rodless cavity and return filter 15 times
To fuel tank 10, a part of hydraulic oil Jing two-way quantitatives pump 3 and two-way plug-in valve 17 return to rod chamber.The third line is up in pressure head
Before the present positions of Cheng Kaiguan 25, piston rod and pressure head are up at a slow speed；After pressure head is up to 25 present positions of third trip switch,
Piston rod and pressure head fast uplink；After pressure head is up to the present position of the second travel switch 24, piston rod and pressure head slow down slowly
OK；When pressure head is up to the first 20 present position of travel switch, the dead electricity of the first magnetic valve 7, servomotor 6 stops operating, and is
System returns to original state.
It is above-described to be embodied as one of example, better embodiment only of the invention.In addition, the present invention goes back
There can be other implementations.It should be noted that all any modification, equivalents made within the spirit and principles in the present invention
Replace, improve etc., should be included within the scope of the present invention.
Claims (7)
1. a kind of Direct Drive Electro-hydraulic Servo System for being applied to asymmetric servo cylinder press, it is characterised in that：It is adopted including information
Collecting system, controller, servo-driver, servomotor, two-way quantitative pump, hydraulic cylinder, fuel tank, wherein, hydraulic cylinder is under gravity
Pull-type asymmetric servo cylinder；
Described information acquisition system includes rod chamber pressure sensor, rodless cavity pressure sensor and piston rod displacement transducer,
The rod chamber pressure sensor is connected to the rod chamber of hydraulic cylinder, rodless cavity pressure sensor be connected to hydraulic cylinder without bar
Chamber, the piston rod displacement transducer is threadingly attached to hydraulic cylinder tail end；
The signal input part of the controller respectively with rod chamber pressure sensor, rodless cavity pressure sensor, piston rod displacement
Sensor connects；
The signal input part of the servo-driver is connected with the signal output part of controller, and its output end connects with servomotor
Connect；
The servomotor is connected with the UVW output ends of servo-driver；
The hydraulic fluid port A of the two-way quantitative pump is connected with the rodless cavity of hydraulic cylinder, the two-way inserting of hydraulic fluid port B the first solenoid valve controls of Jing
Valve is connected with the rod chamber of hydraulic cylinder；
The fuel tank Jing oil absorption filters and hydraulic control one-way valve are connected with the hydraulic fluid port B of two-way quantitative pump, fuel tank Jing replenishing valves and and
Join the first check valve to be connected with the rodless cavity of hydraulic cylinder；
The rodless cavity of the hydraulic cylinder connects fuel tank by replenishing valve.
2. the Direct Drive Electro-hydraulic Servo System for being applied to asymmetric servo cylinder press according to claim 1, its feature exists
In：The fuel tank is arranged on one 5 to 20 meters high of pylon or platform.
3. the Direct Drive Electro-hydraulic Servo System for being applied to asymmetric servo cylinder press according to claim 1, its feature exists
In：The second magnetic valve that the rod chamber of hydraulic cylinder plays on-off action with rodless cavity Jing is connected.
4. the Direct Drive Electro-hydraulic Servo System for being applied to asymmetric servo cylinder press according to claim 1, its feature exists
In：Oil absorption filter is installed on the inlet line of the hydraulic fluid port B of two-way quantitative pump from fuel tank, the oil return from hydraulic cylinder to fuel tank
Return filter is installed, oil absorption filter is coarse filtration, and return filter is essence filtration on pipeline.
5. the Direct Drive Electro-hydraulic Servo System for being applied to asymmetric servo cylinder press according to claim 1, its feature exists
In：The check valves of oil circuit Jing second and safety valve of the rodless cavity of the hydraulic fluid port A connection liquid cylinder pressures of two-way quantitative pump is connected to fuel tank；Oil
The oil circuit of the rod chamber of mouth B connection liquid cylinder pressures is connected to fuel tank through the 3rd check valve and safety valve.
6. the Direct Drive Electro-hydraulic Servo System for being applied to asymmetric servo cylinder press according to claim 1, its feature exists
In：The adjustable travel switch in four positions, the signal output part of travel switch are provided with the stroke of the piston rod of hydraulic cylinder
It is connected with controller.
7. the Direct Drive Electro-hydraulic Servo System for being applied to asymmetric servo cylinder press according to claim 1, its feature exists
In：Servomotor is provided with encoder, and the signal output part of servo-driver is connected with the encoder of servomotor.
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