CN106194910A - A kind of press and hydraulic pressure closed-loop control system thereof and method - Google Patents
A kind of press and hydraulic pressure closed-loop control system thereof and method Download PDFInfo
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- CN106194910A CN106194910A CN201610718268.8A CN201610718268A CN106194910A CN 106194910 A CN106194910 A CN 106194910A CN 201610718268 A CN201610718268 A CN 201610718268A CN 106194910 A CN106194910 A CN 106194910A
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- plunger pump
- variable plunger
- press
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses the hydraulic pressure closed-loop control system of a kind of press, including master controller, servo-driver, servomotor, for monitoring the pressure-detecting device of system pressure and for monitoring the flow detector of flow；Also include the Variable plunger pump of pressure-compensated, the recuperation valve of described Variable plunger pump remains turned-off when system pressure is less than preset pressure to be regulated the flow of described Variable plunger pump by described servomotor, and the recuperation valve of described Variable plunger pump is opened when described system pressure is higher than described preset pressure with the flow being regulated described Variable plunger pump by Stress control.The hydraulic pressure closed-loop control system using the present invention to provide not only maintains the advantage of former servosystem dosing pump, also optimizes the defect such as spill losses, restriction loss in original system simultaneously, and then has saved energy consumption, reduced cost.The invention also discloses the hydraulic pressure closed loop control method of a kind of press and include the press of above-mentioned hydraulic pressure closed-loop control system.
Description
Technical field
The present invention relates to technical field of hydraulic pressure, more particularly, it relates to the hydraulic pressure closed-loop control system of a kind of press and side
Method, further relates to a kind of press including above-mentioned hydraulic pressure closed-loop control system.
Background technology
Press is a kind of to utilize hydrostatic pressure to process the machinery of various material, and it is usually used in pressing process and being pressed into
Shape technique, such as forging and stamping, punching press, cold-extruded, alignment, bending, flange, process of sheet drawing, powder metallurgy, press-fits.As a kind of typical case
Periodic duty equipment, press is in a working cycle, and each stage is all to pump out hydraulic oil to each by oil pump motor
Individual oil cylinder pushing drive mechanism completes a series of actions, and each stage needs different pressure and flow.
Press common in the art is servo press, i.e. by driven by servomotor main transmission oil pump, reduces control
Valve loop processed, a kind of efficient energy-saving press that press slide is controlled.The press of servo-drive has energy-conservation, low noise, height
The advantages such as effect, have market prospect widely.One technological process of press typically requires that master cylinder completes below scheme: master cylinder is fast
The descending compacting aerofluxus pressurize time delay pressure release backhaul of slowing down of speed.But at present major part servo press is made
Oil pump be dosing pump, owing to pump delivery is certain, but be loaded with rate request, so a part of flow needs from main overflow
Valve flows back to fuel tank, has resulted in overflow loss during being somebody's turn to do.Simultaneously because proportional throttle valve does speed control loop, because of and exist joint
Stream loss.
In sum, how to efficiently solve press and cause energy consumption and relatively costly due to overflow loss, throttling loss etc.
Etc. problem, it it is current those skilled in the art's urgent problem.
Summary of the invention
In view of this, first purpose of the present invention is to provide the hydraulic pressure closed-loop control system of a kind of press, this hydraulic pressure
The structure design of closed-loop control system can efficiently solve press and cause energy consumption and cost due to overflow loss, throttling loss etc.
Higher problem, second object of the present invention is to provide the hydraulic pressure closed loop control method of a kind of press and one includes above-mentioned pressure
The press of the hydraulic pressure closed-loop control system of machine.
In order to reach above-mentioned first purpose, the present invention provides following technical scheme:
A kind of hydraulic pressure closed-loop control system of press, including master controller, servo-driver, servomotor, for monitoring
The pressure-detecting device of system pressure and for monitoring the flow detector of flow；Also include the variable piston of pressure-compensated
Pump, the recuperation valve of described Variable plunger pump remains turned-off to be adjusted by described servomotor when system pressure is less than preset pressure
Saving the flow of described Variable plunger pump, the recuperation valve of described Variable plunger pump is when described system pressure is higher than described preset pressure
Open with by Stress control regulation the flow of described Variable plunger pump.
Preferably, in above-mentioned hydraulic pressure closed-loop control system, described pressure-detecting device is pressure transducer.
Preferably, in above-mentioned hydraulic pressure closed-loop control system, described flow detector is encoder.
Preferably, in above-mentioned hydraulic pressure closed-loop control system, described master controller includes for showing that described pressure detecting fills
Put and the display device of described flow detector testing result.
Preferably, in above-mentioned hydraulic pressure closed-loop control system, described master controller includes for setting described Variable plunger pump
The pressure setting module of described preset pressure compensating compression spring.
The hydraulic pressure closed-loop control system of the press that the present invention provides includes master controller, servo-driver, servomotor, pressure
The Variable plunger pump of force checking device, flow detector and pressure-compensated.Wherein, pressure-detecting device is used for the system of monitoring
Pressure, flow detector is for monitoring the flow of system.The recuperation valve of Variable plunger pump is less than preset pressure at system pressure
Time remain turned-off, system by regulation servomotor rotating speed with regulate pressure-compensated Variable plunger pump flow；Work as system
When pressure is higher than preset pressure, the stream being compensated regulated variable plunger displacement pump by the pressure itself of Variable plunger pump opened by recuperation valve
Amount.
When applying the hydraulic pressure closed-loop control system of press of present invention offer, when system pressure F < compensates compression spring to set
Pressure Ps, i.e. during preset pressure, recuperation valve remains turned-off, and Variable plunger pump continues to do maximum pump discharge V_max operating, i.e. compensates pressure
Before power spring setting pressure does not arrive, the change of flow is to be regulated by the rotation speed change of servomotor.I.e. according to Q
=V*n (n is the rotating speed of pump, V=V_max), by the rotating speed of servosystem regulation servomotor, and then the flow of regulation pump.
As F >=Ps, it is mobile that compensating spool will overcome spring force to start, and hydraulic oil will flow to control plunger shaft in proportion.Owing to controlling
Piston area is bigger than swash plate piston area, promotes swash plate to move to the direction reducing variable piston pumpage so controlling piston.
Compensation control system continues in proportion to controlling piston fuel feeding, and regulates hydraulic pressure pump delivery until system pressure is constant.This
Time, Variable plunger pump only provides the hydraulic fluid flow rate that load needs.This pressure compensation variable pump controls swash plate by stroking mechanism
Piston, makes the opening that swash plate holding is certain, when Variable plunger pump output pressure reaches preset pressure, switches to Stress control shape
State, so closed loop variable pump is both without spill losses, also without restriction loss.Thus use above-mentioned hydraulic pressure closed-loop control system not only to tie up
Hold the advantage of former servosystem dosing pump, also optimize the defect such as spill losses, restriction loss in original system, Jin Erjie simultaneously
About energy consumption, reduce cost.
In order to reach above-mentioned second purpose, present invention also offers a kind of press, this press includes hydraulic cylinder, also includes
Any of the above-described kind of hydraulic pressure closed-loop control system.Owing to above-mentioned hydraulic pressure closed-loop control system has above-mentioned technique effect, there is this liquid
The press of pressure closed-loop control system also should have corresponding technique effect.
Present invention also offers the hydraulic pressure closed loop control method of a kind of press, including:
Set the preset pressure compensating compression spring of the Variable plunger pump of pressure-compensated；
When system pressure is less than described preset pressure, the recuperation valve of described Variable plunger pump cuts out, described variable piston
Pump runs with maximum pump discharge, and the rotating speed of the flow-control servomotor according to described system pressure and described Variable plunger pump；
When described system pressure is more than described preset pressure, the recuperation valve of described Variable plunger pump is opened, and regulation is described
Variable piston pump delivery is until described system pressure is constant, when system pressure deteriorates to less than described preset pressure, described
The spool return of the recuperation valve of Variable plunger pump, described Variable plunger pump runs with maximum pump discharge.
Preferably, in above-mentioned hydraulic pressure closed loop control method, described according to described system pressure and described Variable plunger pump
The rotating speed of flow-control servomotor, specifically includes:
Described system pressure according to pressure transducer detection and the flow control of the described Variable plunger pump of encoder detection
The rotating speed of servomotor processed.
Preferably, in above-mentioned hydraulic pressure closed loop control method, presetting of the compensation compression spring of described setting Variable plunger pump
Pressure, specifically includes:
The pressure demand in each stage, the default pressure that master controller setting described each stage is corresponding is run according to described press
Power, and described preset pressure is sent to described Variable plunger pump.
The hydraulic pressure closed loop control method of the press that the application present invention provides, not only maintains the excellent of former servosystem dosing pump
Gesture, also optimizes the defect such as spill losses, restriction loss in original system simultaneously, and then has saved energy consumption, reduced cost.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
The structural representation of a kind of detailed description of the invention of hydraulic pressure closed-loop control system that Fig. 1 provides for the present invention；
Fig. 2 is the control principle structural representation of the Variable plunger pump of pressure-compensated；
Fig. 3 is the process flow diagram of press；
Fig. 4 is pressure compensation variable characteristics curve chart；
The schematic flow sheet of a kind of detailed description of the invention of hydraulic pressure closed loop control method that Fig. 5 provides for the present invention.
In accompanying drawing, labelling is as follows:
Master controller 101, servo-driver 102, servomotor 103, flow detector 104, pressure-detecting device
105, Variable plunger pump 106, hydraulic cylinder 107, swash plate 1, recuperation valve 2.
Detailed description of the invention
The embodiment of the invention discloses the hydraulic pressure closed-loop control system of a kind of press, to avoid overflow loss, throttling loss,
Energy efficient and cost.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
Refer to the structure of a kind of detailed description of the invention of hydraulic pressure closed-loop control system that Fig. 1-Fig. 5, Fig. 1 provide for the present invention
Schematic diagram；Fig. 2 is the control principle structural representation of the Variable plunger pump of pressure-compensated；Fig. 3 is that the technological process of press is shown
It is intended to；Fig. 4 is pressure compensation variable characteristics curve chart；The hydraulic pressure closed loop control method that Fig. 5 provides for the present invention is a kind of concrete real
Execute the schematic flow sheet of mode.
In a kind of detailed description of the invention, the hydraulic pressure closed-loop control system of the press that the present invention provides includes master controller
101, servo-driver 102, servomotor 103, flow detector 104, pressure-detecting device 105 and the change of pressure-compensated
Amount plunger displacement pump 106.
Wherein, the structure and working principle etc. of master controller 101 and servo-driver 102, servomotor 103 refer to existing
Having technology, here is omitted.Pressure-detecting device 105 is used for monitoring system pressure, and concrete can use pressure transducer,
Pressure transducer is electrically connected with main control, by the pressure of pressure transducer acquisition system and pressure information is transferred to master control
Device 101 processed, so master controller 101 can according to pressure information be controlled judge.Certainly, pressure-detecting device as required
105 equipment or the structures for detecting pressure that can also use other routines.Flow detector 104 is for monitoring system
Flow, general flow detector 104 can use encoder, encoder to be electrically connected with master controller 101, detection obtained
The flow information obtained sends to master controller 101, and then the control for master controller 101 judges to provide foundation.Certainly, according to need
, flow detector 104 can also use equipment or the structure for detecting flow of other routines.
Using the Variable plunger pump 106 of pressure-compensated, the recuperation valve 2 of Variable plunger pump 106 is less than pre-at system pressure
If remaining turned-off during pressure, system is by regulating the rotating speed of servomotor 103 with regulation pressure-compensated Variable plunger pump 106
Flow；When system pressure is higher than preset pressure, recuperation valve 2 is opened and is compensated regulation by the pressure itself of Variable plunger pump 106
The flow of Variable plunger pump 106.
Refer to the control principle structural representation of the Variable plunger pump that Fig. 2, Fig. 2 are pressure-compensated.It mainly includes
Variable head (swash plate 1) and recuperation valve 2.Drive Variable plunger pump 106 that whole hydraulic circuit is carried out adaptability at servomotor 103
During regulation, system pressure always acts on swash plate 1 piston, and swash plate 1 piston always keeps hydraulic pressure pump delivery to tend to maximum.
Meanwhile, system pressure also provides pressure for recuperation valve 2 chamber, makes recuperation valve 2 cavity pressure keep balance with the spring force of compensation.Work as liquid
When press pump flow is more than the flow needed for load, system pressure raises, when system pressure is more than preset pressure, and Variable plunger pump
The recuperation valve 2 of 106 is opened, and reduces pump delivery by pressure itself compensation control system, thus reduces system pressure, until being
System pressure is constant.
Namely during compressor operation, when master controller 101 receives press voltage supply request, master controller 101 is controlled
Hydraulic circuit passage processed is opened, and hydraulic oil carries out feed flow under the drive of Variable plunger pump 106 hydraulic cylinder 107.In this process
In, hydraulic pressure closed-loop control system is on the one hand by pressure-detecting device 105, as pressure transducer feeds back to servo-driver 102
Pressure signal, and by flow detector 104, as encoder feeds back flow signal to servo-driver 102, according to feedback
Signal, is calculated the current signal value of control by master controller 101, and using this current signal value as servo-driver 102
Control signal, servo-driver 102 controls the rotary speed of servomotor 103, and servomotor 103 drives plunger displacement pump to whole liquid
Push back road and carry out adapt, thus complete the pressure of hydraulic system and the regulation of flow.On the other hand, Variable plunger pump
106 according to self stroking mechanism, by this pump pressure-discharge capacity variable characteristics curve and combine variable piston, rotates variable head,
Thus the inclination angle changing variable head realizes the regulation of pumpage.It is implemented in combination with servo hydraulic system of both above
Pressure regulates.
Concrete, when F (system pressure) < Ps (compensate compression spring and set pressure), recuperation valve 2 remains turned-off, variable
Plunger displacement pump 106 continues to do maximum pump discharge V_max operating, i.e. compensates compression spring and sets pressure, and namely preset pressure does not arrive
Before soothing the liver, the change of flow is the rotation speed change by servomotor 103 and changes.I.e. according to Q=V*n, in formula, n is variable
The rotating speed of plunger displacement pump 106, V=V_max.By the rotating speed of servosystem regulation servomotor 103, and then the flow of regulation pump.
As F (system pressure) >=Ps, it is mobile that recuperation valve 2 core will overcome spring force to start, and hydraulic oil will flow to control piston in proportion
Chamber.Bigger than swash plate 1 piston area owing to controlling piston area, just promote swash plate 1 to reducing Variable plunger pump so controlling piston
The direction of 106 discharge capacities is moved.Compensation control system continues in proportion to controlling piston fuel feeding, and regulated variable plunger displacement pump 106
Discharge capacity until system pressure constant.Now, Variable plunger pump 106 only provides the hydraulic fluid flow rate that load needs.Then, F is worked as
(system pressure) < during Ps (compensate compression spring and set pressure), compensating spool homing, swash plate 1 is returned to make variable piston
Pump 106 discharge capacity is maximum position.
This pressure compensation variable pump controls swash plate 1 piston by stroking mechanism, makes swash plate 1 keep certain opening, works as pump
When output pressure reaches preset pressure, pump switches to pressure control state, so closed loop variable pump is both without spill losses, also without joint
Stream loss.Before the change pressure additionally set at swash plate 1 does not arrive, the change of flow is turning by servomotor 103
Speed changes and changes.Thus use above-mentioned hydraulic pressure closed-loop control system not only to maintain servosystem in original system and combine quantitatively
The advantage of pump, also optimizes the defect such as spill losses, restriction loss in original system simultaneously.
Refer to the process flow diagram that Fig. 3, Fig. 3 are press.According to pressing process, press requires that master cylinder completes following
Flow process: master cylinder fast downlink slows down and suppresses aerofluxus pressurize time delay pressure release backhaul subsequent cycle.?
In whole press pressing process, wherein deceleration compacting and two processes of pressurize time delay are in high pressure phase.The technology of the present invention side
The pressure compensation control mode that case is possessed with Variable plunger pump 106 by present stage servosystem combines, and reduces above-mentioned two
High pressure phase pumpage, and then the pressure of regulation servo hydraulic system, reach the effects such as high accuracy, low energy consumption, low cost.
Further, in the above-described embodiments, arranging of preset pressure can manually arrange compensation compression spring
Pressure.Concrete, stop screw is screwed onto upper end, regulates spring housing according to necessary flow and pressure range so that it is flow
Initial pressure when changing, i.e. preset pressure meet the requirements, and then regulate stop screw, make flow during high pressure conform to
Asking, flow reads roughly from graduated disc, and the flow in the middle of it is automatic according to pump P-V variable characteristics curve with pressure variation relation
Regulating, referring to Fig. 4, Fig. 4 is pressure compensation variable characteristics curve chart.
For improving the automaticity controlled, preset pressure can also pass through electronic settings.The most described master controller 101 can
To include the pressure setting module of the described preset pressure compensating compression spring for setting described Variable plunger pump 106.Enter
And during compressor operation, when master controller 101 receives hydraulic press voltage supply request, master controller 101 controls valve and beats
Opening the hydraulic circuit passage of corresponding press, hydraulic oil carries out feed flow under the drive of Variable plunger pump 106 hydraulic cylinder 107, and one
Pressure and the flow of hydraulic system are adjusted by servo pressure closed loop by aspect when system pressure is less than preset pressure, tool
Body is as described in above-described embodiment.On the other hand, when system pressure is more than preset pressure, concrete variable displacement plunger displacement pump compensates pressure
The preset pressure of spring is set by master controller 101, and the analog quantity set is sent to variable displacement plunger by master controller 101
Pump, then passes through software formula and combines this pump pressure-discharge capacity variable characteristics curve, it is achieved the regulation of pumpage.More than by
Both sides is implemented in combination with the pressure regulation of servo hydraulic system.
On the basis of above-described embodiment, for the ease of the monitoring to system pressure and flow, master controller 101 can enter
One step includes display device, the detection data of pressure-detecting device 105 and the detection data of flow detector 104 to be carried out
Display.And then related personnel can obtain system operation situation by display device easily.Concrete, display device can be
Display screen etc..
Based on the hydraulic pressure closed-loop control system provided in above-described embodiment, present invention also offers a kind of press, this press
Including any one hydraulic pressure closed-loop control system in above-described embodiment.The hydraulic pressure that have employed in above-described embodiment due to this press closes
Ring control system, so the beneficial effect of this press refer to above-described embodiment.
The invention also discloses the hydraulic pressure closed loop control method of a kind of press, including:
Set the preset pressure compensating compression spring of the Variable plunger pump 106 of pressure-compensated；
When system pressure is less than described preset pressure, the recuperation valve 2 of described Variable plunger pump 106 cuts out, described variable
Plunger displacement pump 106 runs with maximum pump discharge, and according to the flow-control servo electricity of described system pressure and described Variable plunger pump 106
The rotating speed of machine 103；
When described system pressure is more than described preset pressure, the recuperation valve 2 of described Variable plunger pump 106 is opened, regulation
The discharge capacity of described Variable plunger pump 106 is until described system pressure is constant, when system pressure deteriorates to less than described preset pressure
Time, the spool return of the recuperation valve 2 of described Variable plunger pump 106, described Variable plunger pump 106 runs with maximum pump discharge.
The method is not before the change pressure that swash plate 1 sets arrives, and the change of flow is by servomotor 103
Rotation speed change and change；When Variable plunger pump 106 output pressure reaches preset pressure, Variable plunger pump 106 switches to pressure
Controlled state, so closed loop variable pump is both without spill losses, also without restriction loss.Additionally.Thus use above-mentioned hydraulic pressure closed loop
Control system not only maintains servosystem in original system and combines the advantage of dosing pump, also optimizes overflow in original system simultaneously and damages
The defects such as mistake, restriction loss.
Refer to the flow process signal of a kind of detailed description of the invention of hydraulic pressure closed loop control method that Fig. 5, Fig. 5 provide for the present invention
Figure.
In a kind of detailed description of the invention, the hydraulic pressure closed loop control method that the present invention provides comprises the following steps:
S101: set the preset pressure compensating compression spring of the Variable plunger pump 106 of pressure-compensated；
S102: judge that system pressure, whether less than preset pressure, if being carried out step S103, otherwise performs step S104；
S103: recuperation valve 2 cuts out, and enters servo pressure closed loop control；
Namely when system pressure is less than preset pressure, recuperation valve 2 cuts out, and Variable plunger pump 106 is transported with maximum pump discharge
OK, and the rotating speed of the flow-control servomotor 103 according to system pressure and Variable plunger pump 106, to adjust Variable plunger pump
The flow of 106.
S104: recuperation valve 2 is opened, and performs subsequent step；
S105: promote swash plate 1 to move to reduce the discharge capacity of Variable plunger pump 106；
S106: according to the discharge capacity of P-V curve adjustment Variable plunger pump 106；
P-V curve in a kind of detailed description of the invention refer to Fig. 4.
S107: judge that system pressure is the most constant, the most then perform subsequent step, otherwise return step S106；
S108: Variable plunger pump 106 runs with current discharge capacity.
Namely when system pressure is more than preset pressure, it is mobile that recuperation valve 2 core will overcome spring force to start, recuperation valve 2
Opening, hydraulic oil will flow to control plunger shaft in proportion.Bigger than swash plate 1 piston area owing to controlling piston area, so controlling
Piston just promotes swash plate 1 to move to the direction reducing Variable plunger pump 106 discharge capacity.Compensation control system continues in proportion to controlling
Piston fuel feeding, and the discharge capacity of regulated variable plunger displacement pump 106 is until system pressure is constant.Now, Variable plunger pump 106 only provides
The hydraulic fluid flow rate that load needs.Then, when system pressure is reduced to less than preset pressure, recuperation valve 2 core homing, tiltedly
It is maximum position that dish 1 is returned to make Variable plunger pump 106 discharge capacity.
Concrete, in above-described embodiment, according to the flow-control servo of described system pressure and described Variable plunger pump 106
The rotating speed of motor 103 is specifically as follows, according to described system pressure and the described change of encoder detection of pressure transducer detection
The rotating speed of the flow-control servomotor 103 of amount plunger displacement pump 106.Namely Variable plunger pump 106 runs with maximum pump discharge, according to
The testing result of pressure transducer and encoder adjusts the rotating speed flow with regulated variable plunger displacement pump 106 of servomotor 103.When
So, above-mentioned liquid can also be specifically referred to by the detection device of other routines with monitoring system pressure and flow as required
The relevant statement of pressure closed-loop control system, here is omitted.
In the various embodiments described above, in above-mentioned steps S101, may include that
Run the pressure demand in each stage according to described press, master controller 101 sets corresponding the presetting of described each stage
Pressure, and described preset pressure is sent to described Variable plunger pump 106.Namely variable displacement plunger displacement pump compensates compression spring
Preset pressure is set by master controller 101, and the analog quantity set is sent to variable displacement plunger displacement pump, then by master controller 101
When system pressure is more than preset pressure, by software formula and combine this pump pressure-discharge capacity variable characteristics curve, it is achieved pump is arranged
The regulation of amount.
The hydraulic pressure closed-loop control system of the press that the application present invention provides and method, according to following formula:
V=Q/n
In formula, V is the discharge capacity of Variable plunger pump 106, and Q is the flow of Variable plunger pump 106, and n is Variable plunger pump 106
Rotating speed.
As F < PSTime, Q=Qmax, then V=Vmax, VmaxMaximum pump discharge for pump；Work as Fcp≥PSAfter, Variable plunger pump 106 is certainly
Dynamic according to P-V variable characteristics curvilinear motion, reduce pump delivery V, compensation control system continues in proportion to controlling piston simultaneously
Fuel feeding, and the discharge capacity of regulated variable plunger displacement pump 106 is until system pressure is constant.
And in the process, work as Fcp≥PSTime, according to following formula:
Tn=(Fcp*V)/2π
In formula, FcpFor real-time system force value, TnFor Rated motor moment of torsion, due to FcpBeing finally constant, V reduces, then
Tn reduces, then can derive the supporting rating of electric machine and reduce.
Meanwhile, according to following formula:
in=Tn/Kt
In formula, KtFor constant, inDriver rated current, Tn reduces, then inReduce, then can derive supporting servo and drive
Dynamic device 102 specification reduces.
According to following formula:
N=F*Q
In formula, N is system power, and owing to Q reduces, F is constant, then N reduces, then can derive whole system energy-saving effect and carry
High.
Thus hydraulic pressure closed-loop control system and the method for the press of present invention offer is provided, reduce in control system and drive
Device and rating of machine, improve cost performance；Also make the output of Variable plunger pump 106 decline simultaneously, improve whole system
Energy-saving effect.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment, identical similar portion sees mutually.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one
The widest scope caused.
Claims (9)
1. a hydraulic pressure closed-loop control system for press, including master controller, servo-driver, servomotor, for monitoring system
The pressure-detecting device of system pressure and for monitoring the flow detector of flow；It is characterized in that, also include pressure-compensated
Variable plunger pump, the recuperation valve of described Variable plunger pump system pressure less than preset pressure time remain turned-off with by described
Servomotor regulates the flow of described Variable plunger pump, and the recuperation valve of described Variable plunger pump is higher than described at described system pressure
Open with the flow being regulated described Variable plunger pump by Stress control during preset pressure.
The hydraulic pressure closed-loop control system of press the most according to claim 1, it is characterised in that described pressure-detecting device is
Pressure transducer.
The hydraulic pressure closed-loop control system of press the most according to claim 1, it is characterised in that described flow detector is
Encoder.
The hydraulic pressure closed-loop control system of press the most according to claim 1, it is characterised in that described master controller includes using
In showing described pressure-detecting device and the display device of described flow detector testing result.
5. according to the hydraulic pressure closed-loop control system of the press described in any one of claim 1-4, it is characterised in that described main control
Device includes the pressure setting module of the described preset pressure compensating compression spring for setting described Variable plunger pump.
6. a press, including hydraulic cylinder；It is characterized in that, also include the hydraulic pressure closed loop as described in any one of claim 1-5
Control system.
7. the hydraulic pressure closed loop control method of a press, it is characterised in that including:
Set the preset pressure compensating compression spring of the Variable plunger pump of pressure-compensated；
When system pressure is less than described preset pressure, the recuperation valve of described Variable plunger pump cuts out, described Variable plunger pump with
Maximum pump discharge runs, and the rotating speed of the flow-control servomotor according to described system pressure and described Variable plunger pump；
When described system pressure is more than described preset pressure, the recuperation valve of described Variable plunger pump is opened, is regulated described variable
Plunger pump delivery is until described system pressure is constant, when described system pressure deteriorates to less than described preset pressure, described
The spool return of the recuperation valve of Variable plunger pump, described Variable plunger pump runs with maximum pump discharge.
The hydraulic pressure closed loop control method of press the most according to claim 7, it is characterised in that described according to described system pressure
The rotating speed of the flow-control servomotor of power and described Variable plunger pump, specifically includes:
Described system pressure and the flow-control of the described Variable plunger pump of encoder detection according to pressure transducer detection are watched
Take the rotating speed of motor.
9. according to the hydraulic pressure closed loop control method of the press described in claim 7 or 8, it is characterised in that described setting variable post
The preset pressure compensating compression spring of plug pump, specifically includes:
Run the pressure demand in each stage according to described press, master controller sets preset pressure corresponding to described each stage, and
Described preset pressure is sent to described Variable plunger pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610718268.8A CN106194910A (en) | 2016-08-24 | 2016-08-24 | A kind of press and hydraulic pressure closed-loop control system thereof and method |
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| CN109965971A (en) * | 2017-12-27 | 2019-07-05 | 四川锦江电子科技有限公司 | A kind of device and method for closed-loop control charge pump |
| CN111098540A (en) * | 2018-10-25 | 2020-05-05 | 沃恩阿克斯公开股份有限公司 | Press for pressing workpieces |
| CN112524121A (en) * | 2019-09-18 | 2021-03-19 | 上海禾之木工业设备有限公司 | On-line monitoring system based on servo hydraulic system |
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