CN101870160B - Pump-valve compound control hydraulic system for injection molding machine and control method thereof - Google Patents
Pump-valve compound control hydraulic system for injection molding machine and control method thereof Download PDFInfo
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- CN101870160B CN101870160B CN 201010136169 CN201010136169A CN101870160B CN 101870160 B CN101870160 B CN 101870160B CN 201010136169 CN201010136169 CN 201010136169 CN 201010136169 A CN201010136169 A CN 201010136169A CN 101870160 B CN101870160 B CN 101870160B
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Abstract
The invention discloses a pump-valve compound control hydraulic system for an injection molding machine and a control method thereof. In the system, a constant delivery hydraulic pump and a servo motor are connected coaxially; an oil outlet of the constant delivery hydraulic pump is communicated with an oil inlet of a first proportional servo valve; a first oil outlet of the first proportional servo valve is communicated with a first oil inlet of a roller type two-way four-position reversal valve and an oil inlet of a plug-in valve respectively; an oil outlet of the plug-in valve is communicated with an oil inlet cavity of a first hydraulic cylinder; a second oil outlet of the roller type two-way four-position reversal valve is communicated with an oil control port of the plug-in valve; a second oil outlet of the first proportional servo valve is communicated with an oil returning cavity of the first hydraulic cylinder; a first pressure sensor is fixedly arranged at the position of the oil inlet cavity of the first hydraulic cylinder; a second pressure sensor is fixed at the position of the oil returning cavity of the first hydraulic cylinder; a third pressure sensor is arranged at the oil outlet of the constant delivery hydraulic pump; and a first displacement sensor is arranged on a cylinder body of the first hydraulic cylinder or a piston rod. The pump-valve compound control hydraulic system for the injection molding machine and the control method thereof can simultaneously realize energy conservation of an injection molding system and the fine control over speed and pressure.
Description
Technical field
The present invention relates to a kind of injection machine, particularly injection moulding pump-pump-valve compound control hydraulic system and control method thereof.
Background technology
The common energy-saving injection machine of various precisions is for the energy-conservation adjustable speed motor that adopted drives the form of constant displacement pump and the form of all-electric driving.
The system that adjustable speed motor drives regulates pump delivery by the rotating speed that changes motor, make flow output as much as possible with load to coupling.Wherein the system of driven by servomotor is better than the energy saving of system effect that frequency control motor drives, and responds faster.But such system adopts common solenoid directional control valve in injection and dwell pressure control, when injection machine is in packing state, because pressure is the mode that descends step by step, and there is not pressure relief device in the system, can only make by the counter-rotating of motor the hydraulic pump counter-rotating, although can satisfy like this requirement in the production, greatly shorten the service life of pump, and owing to pursue energy-saving effect simply and cause accuracy undesirable.
Complete electric gas-powered injection moulding machine drives ball-screw with servomotor through toothed belt transmission again and controls injection, back pressure, switching molding etc.But exist ball-screw easy to wear, can cause the precision of machine to reduce.And an injection machine even can use four or five servomotors, cost is very large.
Summary of the invention
Technical problem to be solved by this invention is to solve present injection machine system will pursue the contradiction between energy-conservation and the pursuit precision and a kind of injection moulding pump-pump-valve compound control hydraulic system and control method thereof are provided.
It is as follows that the present invention solves the technical scheme that its technical problem takes: the pump-pump-valve compound control hydraulic system that should be used for injection machine mainly comprise roller type two-way four position switching valves, inserted valve, the first hydraulic cylinder, the first proportional servo valve, servomotor, quantitative hydraulic pump, the first displacement transducer, the first pressure sensor, the second pressure sensor, the 3rd pressure sensor, the second hydraulic cylinder, the second proportional servo valve, the second displacement sensor, the 4th pressure sensor and the 5th pressure sensor, quantitative hydraulic pump is connected with servomotor is coaxial, the oil-out of quantitative hydraulic pump is communicated with the oil-in of the first proportional servo valve, the first oil-in of the first oil-out of the first proportional servo valve and roller type two-way four position switching valves, the oil-in of inserted valve is communicated with respectively, the oil-out of inserted valve is communicated with the oil suction chamber of the first hydraulic cylinder, the second oil-out of roller type two-way four position switching valves is communicated with the control port of inserted valve, the second oil-out of the first proportional servo valve is communicated with the oil back chamber of the first hydraulic cylinder, the first pressure sensor is fixedly installed in the oil suction chamber place of the first hydraulic cylinder, the second pressure sensor is fixedly installed in the oil back chamber place of the first hydraulic cylinder, the 3rd pressure sensor is fixedly mounted on the oil-out place of quantitative hydraulic pump, the first displacement transducer is fixedly mounted on the cylinder body or piston rod of the first hydraulic cylinder, described the second hydraulic cylinder is comprised of pair of hydraulic cylinders, the oil-out of quantitative hydraulic pump is communicated with the oil-in of the second proportional servo valve, the first oil-out of the second proportional servo valve is communicated with the oil suction chamber of two hydraulic cylinders of the second hydraulic cylinder respectively, the second oil-out of the second proportional servo valve is communicated with the oil back chamber of two hydraulic cylinders of the second hydraulic cylinder respectively, the 4th pressure sensor is fixedly mounted on the first oil-out place of the second proportional servo valve, the 5th pressure sensor is fixedly mounted on the second oil-out place of the second proportional servo valve, and the second displacement sensor is fixedly mounted on the cylinder body or piston of one of them hydraulic cylinder of the second hydraulic cylinder.
Further, the present invention also comprises the first proportional pressure control valve, and the oil-in of described proportional pressure control valve is communicated with the oil-out of quantitative hydraulic pump.
Further, the present invention also comprises accumulator, check valve, 2/2-way solenoid directional control valve and the second proportional pressure control valve, the oil-in of described check valve, 2/2-way solenoid directional control valve all is communicated with the oil-out of quantitative hydraulic pump, the oil-out of described check valve, 2/2-way solenoid directional control valve all is communicated with the oil-in of the second proportional pressure control valve, and accumulator is communicated with the oil-out of 2/2-way solenoid directional control valve.
The method of using pump-pump-valve compound control hydraulic system of the present invention that injection machine is controlled is may further comprise the steps:
When injection machine folding mould, the PLC controller of injection machine sends to electric machine controller with the constant pressure source pressure signal of setting, the 3rd pressure sensor feeds back to the outlet pressure of quantitative hydraulic pump the electric machine controller of injection machine simultaneously, convert the speed controling signal of servomotor to and this speed controling signal is sent to servo-driver by the difference of electric machine controller with the outlet pressure signal of the constant pressure source signal of described setting and quantitative hydraulic pump, servo-driver is according to the rotating speed of this speed controling signal control servomotor, so that equated with the constant pressure source pressure signal value of setting by the outlet pressure signal of the quantitative hydraulic pump of driven by servomotor;
When the outlet pressure signal of quantitative hydraulic pump equated with the constant pressure source pressure signal value of setting, the PLC controller sent to the pressure signal of the rate signal of the folding mould set and folding mould the valve control of injection machine; The first displacement transducer sends to valve control with the displacement signal of the first hydraulic cylinder simultaneously, and the first pressure sensor and the second pressure sensor correspondingly send to valve control with the oil suction chamber of the first hydraulic cylinder with the pressure signal that goes out oil pocket; The displacement signal of the first hydraulic cylinder that valve control will receive converts the rate signal of the first hydraulic cylinder to, and the oil suction chamber of described the first hydraulic cylinder and the pressure signal that goes out oil pocket subtracted each other obtains difference,
When the oil suction chamber of described the first hydraulic cylinder with to go out difference and the pressure signal of the folding mould of described setting of pressure signal of oil pocket satisfied during with following formula (1), valve control carries out speed control to the first hydraulic cylinder, valve control subtracts each other the rate signal of the rate signal of the folding mould of described setting and described the first hydraulic cylinder and the difference that will obtain converts the control signal of the first proportional servo valve to, the speed of the first hydraulic cylinder is equated with the speed of the folding mould of described setting
△P
1＜90%P
1（1）
In the formula (1), △ P
1Represent the oil suction chamber and the difference that goes out the pressure signal of oil pocket, P of the first hydraulic cylinder
1The pressure signal value of the folding mould that representative is set,
When the oil suction chamber of described the first hydraulic cylinder with to go out difference and the pressure signal of the folding mould of described setting of pressure signal of oil pocket satisfied during with following formula (2), valve control carries out pressure control to the first hydraulic cylinder, valve control subtracts each other the oil suction chamber of the pressure signal of the folding mould of described setting and described the first hydraulic cylinder and the pressure difference value that goes out oil pocket and the difference that obtains is converted to the control signal of the first proportional servo valve, the oil suction chamber of described the first hydraulic cylinder is equated with the pressure of the folding mould of described setting with the pressure difference value that goes out oil pocket
△P
1≥90%P
1（2）
In the formula (2), △ P
1Represent the oil suction chamber and the difference that goes out the pressure signal of oil pocket, P of the first hydraulic cylinder
1The pressure signal value of the folding mould that representative is set;
When the injection machine injection moulding, the PLC controller of injection machine sends to electric machine controller with the constant pressure source pressure signal of setting, the 3rd pressure sensor feeds back to the outlet pressure of quantitative hydraulic pump the electric machine controller of injection machine simultaneously, convert the speed controling signal of servomotor to and this speed controling signal is sent to servo-driver by the difference of electric machine controller with the outlet pressure signal of the constant pressure source signal of described setting and quantitative hydraulic pump, servo-driver is according to the rotating speed of this speed controling signal control servomotor, so that equated with the constant pressure source pressure signal value of setting by the outlet pressure signal of the quantitative hydraulic pump of driven by servomotor;
When the outlet pressure signal of quantitative hydraulic pump 8 equated with the constant pressure source pressure signal value of setting, the PLC controller sent to the valve control of injection machine with the pressure signal of the injection speed signal set and injection, pressurize; The second displacement sensor sends to valve control with the displacement signal of the second hydraulic cylinder simultaneously, and the 4th pressure sensor and the 5th pressure sensor correspondingly send to valve control with the oil suction chamber of the second hydraulic cylinder with the pressure signal that goes out oil pocket; The displacement signal of the second hydraulic cylinder that valve control will receive converts the rate signal of the second hydraulic cylinder to, and the oil suction chamber of described the second hydraulic cylinder and the pressure signal that goes out oil pocket subtracted each other obtains difference,
When the oil suction chamber of described the second hydraulic cylinder with to go out the pressure signal of injection, pressurize of difference and described setting of pressure signal of oil pocket satisfied during with following formula (3), valve control subtracts each other the rate signal of the injection speed signal of described setting and described the second hydraulic cylinder and the difference that obtains is converted to the control signal of the second proportional servo valve, the speed of the second hydraulic cylinder is equated with the injection speed of described setting
△P
2＜90%P
2（3）
In the formula (3), △ P
2Represent the oil suction chamber and the difference that goes out the pressure signal of oil pocket, P of the second hydraulic cylinder
2The injection that representative is set, the pressure signal value of pressurize,
Oil suction chamber and the difference of the pressure signal that goes out oil pocket and the injection of described setting when described the second hydraulic cylinder, when the pressure signal of pressurize satisfies with following formula (4), valve control is with the injection of described setting, the oil suction chamber of the pressure signal of pressurize and described the second hydraulic cylinder and the pressure difference value that goes out oil pocket subtract each other and the difference that obtains are converted to the control signal of the second proportional servo valve, make the oil suction chamber of described the second hydraulic cylinder and go out the pressure difference value of oil pocket and the injection of described setting with the flow of regulating the second proportional servo valve, the pressure of pressurize equates
△P2≥90%P2（4）
In the formula (4), △ P2 represents the oil suction chamber of the second hydraulic cylinder and goes out the difference of the pressure signal of oil pocket, the injection that the P2 representative is set, the pressure signal value of pressurize.
Compared with prior art, the invention has the beneficial effects as follows:
When injection machine injection, pressurize and folding mould, utilized the driven by servomotor quantitative hydraulic pump to provide the hydraulic power source of constant pressure for proportional servo valve, thereby do not had restriction loss, capacity usage ratio is improved.Simultaneously, because the spool of proportional servo valve can continuous motion, so the spool of proportional servo valve can be controlled in the arbitrary position in the adjustable extent, realizes that injection machine speed and two closed loops precisions of pressure control.Thereby make injection machine system realize simultaneously precision control energy-conservation and speed, pressure, have unforeseeable technique effect.
When injection machine carries out pressurize, when the dwell pressure signal of setting is when descending step by step, the spool of proportional servo valve is done counter motion, the pressure of the oil suction chamber of the second hydraulic cylinder is descended rapidly, quantitative hydraulic pump then is in the one-way only operation state always and needn't reverses, thereby quantitative hydraulic pump is without prejudice the prolongation in service life of pump.
Description of drawings
Fig. 1 is hydraulic schematic diagram of the present invention.
Fig. 2 is the hydraulic schematic diagram of the present invention that is used for the compound control of pump-valve of injection machine folding mould.
Fig. 3 is the hydraulic schematic diagram of the present invention when injection machine folding mould that is equipped with proportional pressure control valve.
Fig. 4 is the hydraulic schematic diagram of the present invention of the compound control of pump-valve when being used for injection machine injection, pressurize.
Fig. 5 is the hydraulic schematic diagram of the present invention when injection machine injection, pressurize that is equipped with accumulator and proportional pressure control valve.
The present invention carried out the theory diagram of the compound control of pump-valve when Fig. 6 was the folding mould to injection machine.
The present invention carried out the theory diagram of the compound control of pump-valve when Fig. 7 was injection moulding to injection machine.
Among the figure: 1. roller type two-way four position switching valves, 2. inserted valve, 3. the first hydraulic cylinder, 4. the first displacement transducer, 5. the first pressure sensor, 6. the second pressure sensor, 7. servomotor, 8. quantitative hydraulic pump, 9. the first proportional servo valve, 10. the first proportional pressure control valve, 11. second displacement sensor, 12. the second hydraulic cylinder, 13. the 4th pressure sensor, 14. the 5th pressure sensor, 15. the second proportional servo valve, 16. accumulator, 17. check valve, 18. 2/2-way solenoid directional control valve, 19. the second proportional pressure control valve, 20. the 3rd pressure sensor.
The specific embodiment
Below in conjunction with the accompanying drawing examples of implementation the present invention is described in further detail.
As shown in Figure 2, quantitative hydraulic pump 8 and 7 coaxial connections of servomotor, the oil-out of quantitative hydraulic pump 8 is communicated with the oil-in of the first proportional servo valve 9, the first oil-out of the first proportional servo valve 9 is communicated with respectively with the first oil-in of roller type two-way four position switching valves 1, the oil-in of inserted valve 2, the oil-out of inserted valve 2 is communicated with the oil suction chamber of the first hydraulic cylinder 3, the second oil-out of roller type two-way four position switching valves 1 is communicated with the control port of inserted valve 2, and the second oil-out of the first proportional servo valve 9 is communicated with the oil back chamber of the first hydraulic cylinder 3; The first pressure sensor 5 is fixedly installed in the oil suction chamber place of the first hydraulic cylinder 3, for detection of the pressure of the first hydraulic cylinder 3 oil suction chambers; The second pressure sensor 6 is fixedly installed in the oil back chamber place of the first hydraulic cylinder 3, and for detection of the pressure of the first hydraulic cylinder 3 oil back chambers, the difference of the first pressure sensor 5 and the second pressure sensor 6 namely is the opening and closing molding pressure; The 3rd pressure sensor 20 is fixedly mounted on the oil-out place of quantitative hydraulic pump 8, for detection of the pressure in quantitative hydraulic pump 8 exits; The first displacement transducer 4 is fixedly mounted on the moving component of the first hydraulic cylinder 3, displacement for detection of the first hydraulic cylinder 3, the speed of the first hydraulic cylinder 3 will be obtained: if the cylinder body of the first hydraulic cylinder 3 is fixed behind this displacement differential, then moving component is piston rod, if the piston rod of the first hydraulic cylinder 3 is fixed, then moving component is cylinder body.
The first proportional servo valve 9 is the cross valve of O type for Median Function.
As shown in Figure 3, quantitative hydraulic pump 8 can connect the first proportional pressure control valve 10, the oil-in of the first proportional pressure control valve 10 is communicated with the outlet of quantitative hydraulic pump 8, so that when the pressure of pump-pump-valve compound control hydraulic system of the present invention during greater than the setting value of the first proportional pressure control valve 10, the hydraulic system overflow, thus overall security guaranteed.
As shown in Figure 4, quantitative hydraulic pump 8 and 7 coaxial connections of servomotor, the oil-out of quantitative hydraulic pump 8 is communicated with the oil-in of the second proportional servo valve 15, the first oil-out of the second proportional servo valve 15 is communicated with the oil suction chamber of two hydraulic cylinders of the second hydraulic cylinder 12 respectively, the second proportional servo valve 15 second oil-outs are communicated with the oil back chamber of two hydraulic cylinders of the second hydraulic cylinder 12 respectively, the 4th pressure sensor 13 is fixedly mounted on the first oil-out place of the second proportional servo valve 15, for detection of the pressure of the oil suction chamber of two hydraulic cylinders of the second hydraulic cylinder 12; The 5th pressure sensor 14 is fixedly mounted on the first oil-out place of the second proportional servo valve 15, and for detection of the pressure of two hydraulic cylinder oil back chambers of the second hydraulic cylinder 12, the difference of the 4th pressure sensor 13 and the 5th pressure sensor 14 namely is injection pressure; Second displacement sensor 11 is installed on the moving component of one of them hydraulic cylinder of the second hydraulic cylinder 12: if the first hydraulic cylinder 3 cylinder bodies are fixed, then moving component is piston rod, if piston rod is fixed, then moving component is cylinder body, for detection of two hydraulic cylinder displacements of the second hydraulic cylinder 12, the speed of two hydraulic cylinders of the second hydraulic cylinder 12 will be obtained behind this displacement differential.
The second proportional servo valve 15 is the cross valve of Y type for Median Function.
As shown in Figure 5, check valve 17,2/2-way solenoid directional control valve 18 oil-ins all are communicated with the oil-out of quantitative hydraulic pump, the oil-out of check valve 17,2/2-way solenoid directional control valve 18 all is communicated with the second proportional pressure control valve 19 oil-ins, and the oil-in of accumulator 16 is communicated with the oil-out of 2/2-way solenoid directional control valve 18.In the injection starting stage, control 2/2-way solenoid directional control valve 18 is in open mode, accumulator 16 is to two hydraulic cylinder fuel feeding of the second hydraulic cylinder 12, and the 2/2-way solenoid directional control valve is in cut-off state when pressurize, and quantitative hydraulic pump 8 passes through check valve 17 to accumulator 16 fuel feeding.When the inlet pressure of accumulator 16 during greater than the setting value of the second proportional pressure control valve 19,19 overflows of the second proportional pressure control valve, thereby guarantee the safety of accumulator.The oil-in of the first proportional pressure control valve 10 is communicated with the oil-out of quantitative hydraulic pump 8, when the pressure of pump-pump-valve compound control hydraulic system of the present invention during greater than the setting value of the first proportional pressure control valve 10, hydraulic system overflow, thereby guarantees overall security.
The course of work of the present invention is as follows:
As shown in Figure 1, during injection machine folding mould, the second proportional servo valve 15 is in meta, its less important safety door of shutting injection machine, the first oil-in and second oil-out of roller type two-way four position switching valves 1 are cut off, so that the control port pressure of inserted valve 2 is zero, at this moment, the oil inlet and outlet of inserted valve 2 is communicated with.It is power source that servomotor 7 drives quantitative hydraulic pumps 8, and for the first proportional servo valve 9 provides constant pressure oil, the first proportional servo valve 9 changes restriction by controlling spool position size is controlled speed and two cavity pressures of the first hydraulic cylinder 3.
When injection machine injection, pressurize, the first proportional servo valve 9 is in meta, it is power source that servomotor 7 drives quantitative hydraulic pump 8, for the second proportional servo valve 15 provides constant pressure oil, the size that the second proportional servo valve 15 changes restriction by the control spool position is controlled the speed of two hydraulic cylinders of the second hydraulic cylinder 12 and the pressure of each oil pocket.In the injection starting stage, control 2/2-way solenoid directional control valve 18 is in open mode, accumulator 16 is to the oil suction chamber fuel feeding of two hydraulic cylinders of the second hydraulic cylinder 12, accelerated the response speed of injection, the 2/2-way solenoid directional control valve is in cut-off state when pressurize, and quantitative hydraulic pump 8 is oil-filled to accumulator 16 by check valve 17.
The PLC controller is the upper control device of system, sets the output instruction signal of PLC to electric machine controller and valve control according to the technological requirement of injection moulding.As shown in Figure 6, PLC exports the constant pressure source pressure command signal Ps of the first proportional servo valve 9 during the folding mould
1Give electric machine controller.By the 3rd pressure sensor 20 pressure signal that quantitative hydraulic pump 8 exports is fed back to electric machine controller.Electric machine controller is with the constant pressure source pressure command signal Ps that receives
1Subtract each other its poor e of being with the feedback signal of the 3rd pressure sensor 20
1, and with e
1The speed controling signal that converts servomotor 7 to sends to servo-driver, and servo-driver is according to the rotating speed of this speed controling signal control servomotor 7, so that the outlet pressure of the quantitative hydraulic pump 8 that is driven by servomotor 7 and the constant pressure source pressure P s of setting
1Equate, thereby provide constant pressure source pressure P s for the first proportional servo valve 9
1
As the outlet pressure of quantitative hydraulic pump 8 and the constant pressure source pressure P s of setting
1When equating, the PLC controller is with the rate signal V of the folding mould of setting
1Pressure signal P with the folding mould
1Send to the valve control of injection machine; The first displacement transducer 4 sends to valve control with the displacement signal of the first hydraulic cylinder 3 simultaneously, the first pressure sensor 5 sends to valve control with the pressure signal of the oil suction chamber of the first hydraulic cylinder 3, and the second pressure sensor 6 sends to valve control with the pressure signal that goes out oil pocket of the first hydraulic cylinder 3; The displacement signal of the first hydraulic cylinder that valve control will receive converts the rate signal of the first hydraulic cylinder 3 to, and the oil suction chamber of described the first hydraulic cylinder 3 and the pressure signal that goes out oil pocket subtracted each other obtains difference,
When the oil suction chamber of described the first hydraulic cylinder 3 with to go out difference and the pressure signal of the folding mould of described setting of pressure signal of oil pocket satisfied during with following formula (1), valve control carries out speed control to the first hydraulic cylinder 3, and valve control is with the rate signal V of the folding mould of described setting
1Subtract each other with the rate signal of described the first hydraulic cylinder 3 and with the difference e that obtains
2Convert the control signal of the first proportional servo valve 9 to, the speed of the first hydraulic cylinder 3 equated with the speed of the folding mould of described setting,
△P
1＜90%P
1（1）
In the formula (1), △ P
1Represent the oil suction chamber and the difference that goes out the pressure signal of oil pocket, P of the first hydraulic cylinder 3
1The pressure signal of the folding mould that representative is set,
When the oil suction chamber of described the first hydraulic cylinder 3 with go out the difference of pressure signal of oil pocket and the pressure signal P of the folding mould of described setting
1When satisfying with following formula (2), valve control carries out pressure control to the first hydraulic cylinder 3, and valve control is with the pressure signal P of the folding mould of described setting
1Subtract each other with the oil suction chamber of described the first hydraulic cylinder 3 and the pressure difference value that goes out oil pocket and with the difference e that obtains
3Convert the control signal of the first proportional servo valve 9 to, make the pressure P of oil suction chamber with the folding mould of the pressure difference value that goes out oil pocket and described setting of described the first hydraulic cylinder with the flow of regulating the first proportional servo valve 9
1Equate,
△P
1≥90%P
1（2）
In the formula (2), △ P
1Represent the oil suction chamber and the difference that goes out the pressure signal of oil pocket, P of the first hydraulic cylinder 3
1The pressure signal of the folding mould that representative is set;
As shown in Figure 7, when the injection machine injection moulding, the PLC controller of injection machine is with the constant pressure source pressure signal P s that sets
2Send to electric machine controller, simultaneously the 3rd pressure sensor 20 feeds back to the electric machine controller of injection machine with the outlet pressure of quantitative hydraulic pump 8, by the constant pressure source pressure signal P s of electric machine controller with described setting
2Difference e with the outlet pressure signal of quantitative hydraulic pump 8
4Convert the speed controling signal of servomotor 7 to and this speed controling signal is sent to servo-driver, servo-driver is according to the rotating speed of this speed controling signal control servomotor 7, so that the outlet pressure of the quantitative hydraulic pump 8 that is driven by servomotor 7 and the constant pressure source pressure P s of setting
2Equate, thereby provide constant pressure source pressure P s for the first proportional servo valve 9
2
As the outlet pressure signal of quantitative hydraulic pump 8 and the constant pressure source pressure signal P s of setting
2When equating, the PLC controller is with the injection speed signal V that sets
2Pressure signal P with injection, pressurize
2Send to the valve control of injection machine; Second displacement sensor 11 displacement signals with the second hydraulic cylinder 12 send to valve control simultaneously, the 4th pressure sensor 13 sends to valve control with the pressure signal of the oil suction chamber of the second hydraulic cylinder 12, and 14 pressure signals that go out oil pocket with the second hydraulic cylinder 12 of the 5th pressure sensor send to valve control; The displacement signal of the second hydraulic cylinder 12 that valve control will receive converts the rate signal of the second hydraulic cylinder 12 to, and the oil suction chamber of described the second hydraulic cylinder 12 and the pressure signal that goes out oil pocket subtracted each other obtains difference,
When the oil suction chamber of described the second hydraulic cylinder 12 with go out the difference of pressure signal of oil pocket and the injection of described setting, the pressure signal P of pressurize
2When satisfying with following formula (3), valve control carries out speed control to the second hydraulic cylinder 12, and valve control is with the injection speed V of described setting
2The rate signal of signal and described the second hydraulic cylinder 12 subtracts each other and with the difference e that obtains
5Convert the control signal of the second proportional servo valve 15 to, make the speed of the second hydraulic cylinder 12 and the injection speed V of described setting with the flow of regulating the second proportional servo valve 15
2Equate,
△P
2＜90%P
2（3）
In the formula (3), △ P
2Represent the oil suction chamber and the difference that goes out the pressure signal of oil pocket, P of the second hydraulic cylinder 12
2The injection that representative is set, the pressure signal of pressurize,
When the oil suction chamber of described the second hydraulic cylinder 12 with to go out the pressure signal of injection, pressurize of difference and described setting of pressure signal of oil pocket satisfied during with following formula 4, valve control carries out pressure control to the second hydraulic cylinder 12, and valve control is with the injection of described setting, the pressure signal P of pressurize
2Subtract each other with the oil suction chamber of described the second hydraulic cylinder 12 and the pressure difference value that goes out oil pocket and with the difference e that obtains
6Convert the control signal of the second proportional servo valve 15 to, make the oil suction chamber of described the second hydraulic cylinder 12 and go out the pressure difference value of oil pocket and the injection of described setting, the pressure P of pressurize with the flow of regulating the second proportional servo valve 15
2Equate,
△P
2≥90%P
2（4）
In the formula (4), △ P
2Represent the oil suction chamber and the difference that goes out the pressure signal of oil pocket, P of the second hydraulic cylinder 12
2The injection that representative is set, the pressure signal of pressurize.
Claims (4)
1. pump-pump-valve compound control hydraulic system that is used for injection machine, it is characterized in that: comprise roller type two-way four position switching valves (1), inserted valve (2), the first hydraulic cylinder (3), the first proportional servo valve (9), servomotor (7), quantitative hydraulic pump (8), the first displacement transducer (4), the first pressure sensor (5), the second pressure sensor (6), the 3rd pressure sensor (20), the second hydraulic cylinder (12), the second proportional servo valve (15), second displacement sensor (11), the 4th pressure sensor (13) and the 5th pressure sensor (14), quantitative hydraulic pump (8) and coaxial connection of servomotor (7), the oil-out of quantitative hydraulic pump (8) is communicated with the oil-in of the first proportional servo valve (9), the first oil-in of the first oil-out of the first proportional servo valve (9) and roller type two-way four position switching valves (1), the oil-in of inserted valve (2) is communicated with respectively, the oil-out of inserted valve (2) is communicated with the oil suction chamber of the first hydraulic cylinder (3), the second oil-out of roller type two-way four position switching valves (1) is communicated with the control port of inserted valve (2), the second oil-out of the first proportional servo valve (9) is communicated with the oil back chamber of the first hydraulic cylinder (3), the first pressure sensor (5) is fixedly installed in the oil suction chamber place of the first hydraulic cylinder (3), the second pressure sensor (6) is fixedly installed in the oil back chamber place of the first hydraulic cylinder (3), the 3rd pressure sensor (20) is fixedly mounted on the oil-out place of quantitative hydraulic pump (8), and the first displacement transducer (4) is fixedly mounted on the cylinder body or piston rod of the first hydraulic cylinder (3); Described the second hydraulic cylinder (12) is comprised of pair of hydraulic cylinders, the oil-out of quantitative hydraulic pump (8) is communicated with the oil-in of the second proportional servo valve (15), the first oil-out of the second proportional servo valve (15) is communicated with the oil suction chamber of two hydraulic cylinders of the second hydraulic cylinder (12) respectively, the second oil-out of the second proportional servo valve (15) is communicated with the oil back chamber of two hydraulic cylinders of the second hydraulic cylinder (12) respectively, the 4th pressure sensor (13) is fixedly mounted on the first oil-out place of the second proportional servo valve (15), the 5th pressure sensor (14) is fixedly mounted on the second oil-out place of the second proportional servo valve (15), and second displacement sensor (11) is fixedly mounted on the cylinder body or piston of one of them hydraulic cylinder of the second hydraulic cylinder (12).
2. pump-the pump-valve compound control hydraulic system for injection machine according to claim 1, it is characterized in that: also comprise the first proportional pressure control valve (10), the oil-in of described proportional pressure control valve (10) is communicated with the oil-out of quantitative hydraulic pump (8).
3. pump-the pump-valve compound control hydraulic system for injection machine according to claim 1 and 2, it is characterized in that: also comprise accumulator (16), check valve (17), 2/2-way solenoid directional control valve (18) and the second proportional pressure control valve (19), described check valve (17), the oil-in of 2/2-way solenoid directional control valve (18) all is communicated with the oil-out of quantitative hydraulic pump (8), described check valve (17), the oil-out of 2/2-way solenoid directional control valve (18) all is communicated with the oil-in of the second proportional pressure control valve (19), and accumulator (16) is communicated with the oil-out of 2/2-way solenoid directional control valve (18).
4. method that right to use requires 1 described pump-pump-valve compound control hydraulic system that injection machine is controlled is characterized in that may further comprise the steps:
When injection machine folding mould, the PLC controller of injection machine sends to electric machine controller with the constant pressure source pressure signal of setting, the 3rd pressure sensor (20) feeds back to described electric machine controller with the outlet pressure of quantitative hydraulic pump (8) simultaneously, convert the speed controling signal of servomotor (7) to and this speed controling signal is sent to servo-driver by the difference of electric machine controller with the outlet pressure signal of the constant pressure source signal of described setting and quantitative hydraulic pump (8), servo-driver is according to the rotating speed of this speed controling signal control servomotor (7), so that the outlet pressure signal of the quantitative hydraulic pump (8) that is driven by servomotor (7) equates with the constant pressure source pressure signal value of setting;
When the outlet pressure signal of quantitative hydraulic pump (8) equated with the constant pressure source pressure signal value of setting, the PLC controller sent to the pressure signal of the rate signal of the folding mould set and folding mould the valve control of injection machine; The first displacement transducer (4) sends to valve control with the displacement signal of the first hydraulic cylinder (3) simultaneously, and the first pressure sensor (5) and the second pressure sensor (6) correspondingly send to valve control with the oil suction chamber of the first hydraulic cylinder (3) with the pressure signal that goes out oil pocket; The displacement signal of the first hydraulic cylinder (3) that valve control will receive converts the rate signal of the first hydraulic cylinder (3) to, and the oil suction chamber of described the first hydraulic cylinder (3) and the pressure signal that goes out oil pocket subtracted each other obtains difference,
When described the first hydraulic cylinder, the pressure signal of the difference of oil suction chamber (3) and the pressure signal that goes out oil pocket and the folding mould of described setting satisfies with following formula, (1) time, valve control is with rate signal and described first hydraulic cylinder of the folding mould of described setting, (3) rate signal subtracts each other and converts the difference that obtains to first proportional servo valve, (9) control signal, to regulate the first proportional servo valve, (9) flow makes the first hydraulic cylinder, (3) speed equates with the speed of described setting folding mould
△P
1＜90%P
1 （1）
In the formula (1), △ P
1Represent the oil suction chamber and the difference that goes out the pressure signal of oil pocket, P of the first hydraulic cylinder (3)
1The pressure signal value of the folding mould that representative is set,
When described the first hydraulic cylinder, the pressure signal of the difference of oil suction chamber (3) and the pressure signal that goes out oil pocket and the folding mould of described setting satisfies with following formula, (2) time, valve control is with pressure signal and described first hydraulic cylinder of the folding mould of described setting, (3) oil suction chamber subtracts each other with the pressure difference value that goes out oil pocket and converts the difference that obtains to first proportional servo valve, (9) control signal, to regulate the first proportional servo valve, (9) flow makes the oil suction chamber of described the first hydraulic cylinder and the pressure difference value that goes out oil pocket equate with the pressure of the folding mould of described setting
△P
1≥90%P
1 （2）
In the formula (2), △ P
1Represent the oil suction chamber and the difference that goes out the pressure signal of oil pocket, P of the first hydraulic cylinder (3)
1The pressure signal value of the folding mould that representative is set;
When the injection machine injection moulding, the PLC controller of injection machine sends to electric machine controller with the constant pressure source pressure signal of setting, the 3rd pressure sensor (20) feeds back to described electric machine controller with the outlet pressure of quantitative hydraulic pump (8) simultaneously, convert the speed controling signal of servomotor (7) to and this speed controling signal is sent to servo-driver by the difference of electric machine controller with the outlet pressure signal of the constant pressure source signal of described setting and quantitative hydraulic pump (8), servo-driver is according to the rotating speed of this speed controling signal control servomotor (7), so that the outlet pressure signal of the quantitative hydraulic pump (8) that is driven by servomotor (7) equates with the constant pressure source pressure signal value of setting;
When the outlet pressure signal of quantitative hydraulic pump (8) equated with the constant pressure source pressure signal value of setting, the PLC controller sent to the valve control of injection machine with the pressure signal of the injection speed signal set and injection, pressurize; Second displacement sensor (11) sends to valve control with the displacement signal of the second hydraulic cylinder (12) simultaneously, and the 4th pressure sensor (13) and the 5th pressure sensor (14) correspondingly send to valve control with the oil suction chamber of the second hydraulic cylinder (12) with the pressure signal that goes out oil pocket; The displacement signal of the second hydraulic cylinder (12) that valve control will receive converts the rate signal of the second hydraulic cylinder (12) to, and the oil suction chamber of described the second hydraulic cylinder (12) and the pressure signal that goes out oil pocket subtracted each other obtains difference,
When the oil suction chamber of described the second hydraulic cylinder (12) with to go out the pressure signal of injection, pressurize of difference and described setting of pressure signal of oil pocket satisfied during with following formula (3), valve control subtracts each other the rate signal of the injection speed signal of described setting and described the second hydraulic cylinder (12) and the difference that will obtain converts the control signal of the second proportional servo valve (15) to, the speed of the second hydraulic cylinder (12) is equated with described setting injection speed
△P
2＜90%P
2 （3）
In the formula (3), △ P
2Represent the oil suction chamber and the difference that goes out the pressure signal of oil pocket, P of the second hydraulic cylinder (12)
2The injection that representative is set, the pressure signal value of pressurize,
Oil suction chamber and the difference of the pressure signal that goes out oil pocket and the injection of described setting when described the second hydraulic cylinder (12), when the pressure signal of pressurize satisfies with following formula (4), valve control is with the injection of described setting, the oil suction chamber of the pressure signal of pressurize and described the second hydraulic cylinder (12) and the pressure difference value that goes out oil pocket subtract each other and the difference that obtains are converted to the control signal of the second proportional servo valve (15), make the oil suction chamber of described the second hydraulic cylinder (12) and go out the pressure difference value of oil pocket and the injection of described setting with the flow of regulating the second proportional servo valve (15), the pressure of pressurize equates
△P
2≥90%P
2 （4）
In the formula (4), △ P
2Represent the oil suction chamber and the difference that goes out the pressure signal of oil pocket, P of the second hydraulic cylinder (12)
2The injection that representative is set, the pressure signal value of pressurize.
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| CN102700098A (en) * | 2012-05-25 | 2012-10-03 | 浙江大学 | Servo energy-saving driving control system and method of injection molding machine |
| US20160222987A1 (en) * | 2013-09-16 | 2016-08-04 | Tm Investor Ltd | Hydraulic accumulator and method for recovering energy in a hydraulic system |
| CN104121255B (en) * | 2014-07-18 | 2016-08-17 | 国家电网公司 | Electric-hydraulic proportion circuit system |
| CN105436378A (en) * | 2014-09-03 | 2016-03-30 | 天津市天锻压力机有限公司 | Low speed control system for isothermal thermal forming hydraulic machine |
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| CN113290805B (en) * | 2021-04-09 | 2022-11-15 | 宁波伊士通技术股份有限公司 | Back pressure control method of hydraulic injection molding machine |
| CN114311575B (en) * | 2021-12-30 | 2024-03-29 | 阿托斯(上海)液压有限公司 | Injection molding machine back pressure control device and method based on double closed-loop PID regulation |
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|---|---|---|---|---|
| JP2004314491A (en) * | 2003-04-17 | 2004-11-11 | Toshiba Mach Co Ltd | Mold clamping device of injection molding machine or the like |
| CN1817611A (en) * | 2006-03-07 | 2006-08-16 | 太原理工大学 | Injection machine system with electromechanical liquid composite control |
| CN201645777U (en) * | 2010-03-30 | 2010-11-24 | 浙江大学 | Pump-valve composite control hydraulic system for injection molding machine |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004314491A (en) * | 2003-04-17 | 2004-11-11 | Toshiba Mach Co Ltd | Mold clamping device of injection molding machine or the like |
| CN1817611A (en) * | 2006-03-07 | 2006-08-16 | 太原理工大学 | Injection machine system with electromechanical liquid composite control |
| CN201645777U (en) * | 2010-03-30 | 2010-11-24 | 浙江大学 | Pump-valve composite control hydraulic system for injection molding machine |
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