CN111421871B - Closed electrohydraulic control system of hydraulic motor driving press - Google Patents
Closed electrohydraulic control system of hydraulic motor driving press Download PDFInfo
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- CN111421871B CN111421871B CN202010435809.2A CN202010435809A CN111421871B CN 111421871 B CN111421871 B CN 111421871B CN 202010435809 A CN202010435809 A CN 202010435809A CN 111421871 B CN111421871 B CN 111421871B
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- 230000001502 supplementing effect Effects 0.000 claims abstract description 61
- 230000001105 regulatory effect Effects 0.000 claims abstract description 45
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000003921 oil Substances 0.000 claims description 159
- 238000006073 displacement reaction Methods 0.000 claims description 25
- 230000001276 controlling effect Effects 0.000 claims description 11
- 239000010720 hydraulic oil Substances 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 9
- 239000013589 supplement Substances 0.000 claims description 7
- 230000009347 mechanical transmission Effects 0.000 abstract description 5
- 230000005484 gravity Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 239000010729 system oil Substances 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure
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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
- B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
- B30B15/20—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram controlling the speed of the ram, e.g. the speed of the approach, pressing or return strokes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Control Of Presses (AREA)
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Abstract
The invention discloses a closed electrohydraulic control system of a hydraulic motor driving type press, which mainly comprises: the hydraulic system comprises an electrohydraulic proportional variable hydraulic motor, an electrohydraulic proportional variable pump, an oil supplementing pressure regulating valve, a hovering electromagnetic valve, a hovering safety valve, a pressing safety valve, a first oil supplementing one-way valve, a second oil supplementing one-way valve, a first electromagnetic ball valve, a second electromagnetic ball valve, a balance safety valve, a balance energy accumulator group, a first pressure sensor, a second pressure sensor, a third pressure sensor, a motor and the like. The invention simplifies the electrohydraulic system of the pump-control motor hydraulic transmission and gear-rack mechanical transmission hybrid driving press, has high working efficiency, can automatically adjust parameters such as pressing force, pressing speed and the like in an electrodeless manner, and has excellent process flexibility.
Description
Technical Field
The invention relates to an electrohydraulic control system, in particular to a closed electrohydraulic control system, and especially relates to a closed electrohydraulic control system of a hydraulic motor driven press.
Background
The press machine can be divided into a hydraulic press and a mechanical press according to a transmission mode. The power-volume ratio of the transmission mechanism of the hydraulic machine is large, linear transmission, stepless speed regulation, pressure regulation, maintenance and the like are easy to realize, however, the working efficiency of the hydraulic machine is lower, and the system of the high-speed hydraulic machine is very complex; the mechanical press has higher working efficiency, but can not output constant pressing force in a large stroke range, and the flexible adjustment of parameters and long-time pressure maintenance of the mechanical press can be realized only by a very complex structure and a system. How to combine hydraulic transmission and mechanical transmission to develop a novel hybrid drive mode with the advantages of the hydraulic transmission and the mechanical transmission is one of the development directions of the technical field of the press.
Disclosure of Invention
The invention aims to provide a closed electrohydraulic control system of a hydraulic motor driven press, which has the advantages of simple system hardware composition, hydraulic transmission and mechanical transmission, high working efficiency and easy realization of flexible adjustment of technological parameters.
The technical scheme of the invention is as follows:
The invention mainly comprises the following steps: the hydraulic system comprises an electrohydraulic proportional variable hydraulic motor, an electrohydraulic proportional variable pump, an oil supplementing pressure regulating valve, a hovering electromagnetic valve, a hovering safety valve, a pressing safety valve, a first oil supplementing one-way valve, a second oil supplementing one-way valve, a first electromagnetic ball valve, a second electromagnetic ball valve, a balance safety valve, a balance energy accumulator group, a first pressure sensor, a second pressure sensor, a third pressure sensor, a motor and the like. An output shaft of the electrohydraulic proportional variable hydraulic motor is coaxially connected with the gear; an oil port A of the electro-hydraulic proportional variable hydraulic motor is communicated with an A port of the electro-hydraulic proportional variable pump, an oil inlet of a pressing safety valve, an oil outlet of a first oil supplementing one-way valve and a detection port of a first pressure sensor; an oil port B of the electrohydraulic proportional variable hydraulic motor is communicated with an oil inlet of a hovering safety valve of an A port of the hovering electromagnetic valve; the port B of the electro-hydraulic proportional variable pump is communicated with the port P of the hovering electromagnetic valve, the oil outlet of the second oil supplementing one-way valve and the detection port of the second pressure sensor; an oil outlet of the oil supplementing pump is communicated with an oil inlet of the oil supplementing pressure regulating valve, an oil inlet of the first electromagnetic ball valve and an oil inlet of the second electromagnetic ball valve; an oil outlet of the first electromagnetic ball valve is communicated with an oil inlet of the first oil supplementing one-way valve and an oil inlet of the second oil supplementing one-way valve; the oil outlet of the second electromagnetic ball valve is communicated with the oil inlet of the balance safety valve, the oil port of the balance accumulator set, the rod cavity of the balance cylinder and the detection port of the third pressure sensor; the rodless cavity of the balance cylinder is communicated with the atmosphere; the oil suction port of the oil supplementing pump, the oil outlet of the oil supplementing pressure regulating valve, the oil outlet of the hovering safety valve, the oil outlet of the pressing safety valve and the oil outlet of the balancing safety valve are communicated with the hydraulic oil tank; the motor is coaxially connected with the electro-hydraulic proportional variable pump and the oil supplementing pump.
Further, the closed electro-hydraulic control system of the hydraulic motor driven press is characterized in that: the displacement V of the electrohydraulic proportional variable hydraulic motor can be controlled in a closed loop; the output flow Q of the electro-hydraulic proportional variable pump and the pressure difference P AB of A, B ports can be controlled in a closed loop manner; the motor speed can be controlled in a closed loop, and can be used as a motor to drag a load or be dragged by the load to be in a generator mode; the output torque of the electrohydraulic proportional variable hydraulic motor and the gear is T, and the transmission ratio of the torque T and the rack output pressing force F is i; the rotation speed of the electrohydraulic proportional variable hydraulic motor and the gear is n; the above parameters satisfy:
Q=n×V。
F=i×T。
PAB×V=2×π×T。
The control step of the press comprises the following steps:
Step 1: when the hovering electromagnetic valve is electrified, the rotating speed n of the gear is higher when the sliding block of the press is fast down, the displacement V of the electro-hydraulic proportional variable hydraulic motor is regulated to be smaller and fixed so as to limit the flow Q of the system, the rotating speed n of the electro-hydraulic proportional variable hydraulic motor is regulated by controlling the output flow Q of the electro-hydraulic proportional variable pump, so that the aim of controlling the fast down speed of the sliding block of the press is fulfilled, oil output from the port A of the electro-hydraulic proportional variable hydraulic pump enters the oil port A of the electro-hydraulic proportional variable hydraulic motor, oil discharged from the oil port B of the electro-hydraulic proportional variable hydraulic motor enters the port B of the electro-hydraulic proportional variable pump through the hovering electromagnetic valve, and the rotating speed of the motor is controlled to be constant and dragged by the electro-hydraulic proportional variable pump so as to be in a generator mode.
Step 2: the hovering electromagnetic valve is electrified, the displacement V of the electro-hydraulic proportional variable hydraulic motor is regulated to P AB/(2×π×F/i),PAB according to the required pressing force F, the system setting working pressure is taken, at the moment, the displacement V is increased, the rotating speed n is reduced, the electro-hydraulic proportional variable hydraulic motor can output enough torque, the pressing speed of the sliding block is regulated by controlling the output flow Q of the electro-hydraulic proportional variable pump, oil output from the port A of the electro-hydraulic proportional variable hydraulic motor in the step enters the oil port A of the electro-hydraulic proportional variable hydraulic motor, oil discharged from the oil port B of the electro-hydraulic proportional variable hydraulic motor enters the port B of the electro-hydraulic proportional variable pump through the hovering electromagnetic valve, the rotating speed of the motor is controlled to be constant, and the electro-hydraulic proportional variable pump and the oil supplementing pump are dragged.
Step 3: the hovering electromagnetic valve is electrified, the press slide blocks press the workpiece to set working pressure, the motor rotation speed is reduced, and P AB is closed-loop regulated by the electrohydraulic proportional variable pump to realize the holding of pressing force F.
Step 4: the hovering electromagnetic valve is electrified, the displacement V of the electro-hydraulic proportional variable hydraulic motor is gradually reduced to a certain fixed value, then P AB is gradually regulated to 0 through the electro-hydraulic proportional variable pump, and the motor is rotated to 0.
Step 5: when the hovering electromagnetic valve is powered off, the electro-hydraulic proportional variable pump reversely outputs flow Q, at the moment, the displacement V of the electro-hydraulic proportional variable hydraulic motor is smaller, so that the gear rotating speed n is higher, the press slide block realizes quick return, the return speed of the slide block is regulated by controlling the output flow Q of the electro-hydraulic proportional variable pump, in the step, oil output from the port B of the electro-hydraulic proportional variable pump enters the port B of the electro-hydraulic proportional variable hydraulic motor through the hovering electromagnetic valve, oil discharged from the port A of the electro-hydraulic proportional variable hydraulic motor enters the port A of the electro-hydraulic proportional variable pump, the motor rotating speed is controlled to be constant, and the electro-hydraulic proportional variable pump and the oil supplementing pump are dragged.
Step 6: when the hovering electromagnetic valve is powered off, the displacement V of the electro-hydraulic proportional variable hydraulic motor is regulated to the maximum value, the motor is regulated to 0 in a rotating mode, the output flow Q of the electro-hydraulic proportional variable pump is 0, and the sliding block of the press hovers.
In the process of steps 1 to 6, the first electromagnetic ball valve and the second electromagnetic ball valve are powered off, and the oil supplementing pump injects hydraulic oil into the low pressure side of the closed system through the first oil supplementing one-way valve or the second oil supplementing one-way valve so as to supplement the hydraulic oil leaked in the working process and simultaneously exchange heat and cool, and the oil supplementing pressure is set through the oil supplementing pressure regulating valve.
Step 7: if the oil pressure in the balance energy accumulator group is lower than a set value, the first electromagnetic ball valve and the second electromagnetic ball valve are electrified, the oil supplementing pressure of the balance system is set through the oil supplementing pressure regulating valve, and the oil supplementing pump supplements pressure oil for the balance energy accumulator group; at the moment, the hovering electromagnetic valve is powered off, the motor rotates to be regulated to 0, the output flow Q of the electro-hydraulic proportional variable pump is 0, the displacement V of the electro-hydraulic proportional variable hydraulic motor is regulated to be the maximum value, and the press sliding block hovers.
The beneficial effects of the invention are as follows:
1. The invention combines the hydraulic transmission of the pump control motor with the mechanical transmission of the gear and the rack, realizes the hybrid drive of the press, can finish the high-frequency stroke, and has easy flexible adjustment of the technological parameters of the press.
2. The hydraulic transmission part of the invention is a closed pump control motor, adopts the form of matching the electrohydraulic proportional variable pump with the electrohydraulic proportional variable hydraulic motor, has wide pressing speed adjusting range and various forms of matching the pressing force and the pressing speed, and greatly simplifies the hardware of a hydraulic system.
3. The invention is provided with the balance cylinder for balancing the weight of the sliding block assembly, realizes the recycling of energy, reduces useless power consumption, and ensures that the running process of the press is stable and has small impact; further cooperate discharge capacity adjustable hydraulic pump and motor, the press possesses energy consumption management flexibility.
Drawings
FIG. 1 is a schematic diagram of an electro-hydraulic system of the present invention.
Fig. 2 is a schematic structural view of a hybrid driving press.
In fig. 1: 301-a gear, 304-a balance cylinder, 801-an electro-hydraulic proportional variable hydraulic motor, 802-an electro-hydraulic proportional variable pump, 803-a make-up pump, 804-a make-up pressure regulating valve, 805-a hover solenoid valve, 806-a hover safety valve, 807-a press safety valve, 808-a first make-up one-way valve, 809-a second make-up one-way valve, 810-a first electromagnetic ball valve, 811-a second electromagnetic ball valve, 812-a balance safety valve, 813-a balance accumulator set, 814-a first pressure sensor, 815-a second pressure sensor, 816-a third pressure sensor; 817-motor.
In fig. 2: 301-gear, 302-rack, 303-catch wheel, 304-balance cylinder, 305-slider, 306-guide rail, 307-host frame.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 and2, the present invention includes: an electro-hydraulic proportional variable hydraulic motor 801, an electro-hydraulic proportional variable pump 802, a make-up pump 803, a make-up pressure regulating valve 804, a hover solenoid valve 805, a hover relief valve 806, a hold-down relief valve 807, a first make-up check valve 808, a second make-up check valve 809, a first solenoid valve 810, a second solenoid valve 811, a balance relief valve 812, a balance accumulator set 813, a first pressure sensor 814, a second pressure sensor 815, a third pressure sensor 816, a motor 817, and the like. An output shaft of the electrohydraulic proportional variable hydraulic motor 801 is coaxially coupled with the gear 301; an oil port A of the electro-hydraulic proportional variable hydraulic motor 801 is communicated with an A port of the electro-hydraulic proportional variable pump 802, an oil inlet of the pressing safety valve 807, an oil outlet of the first oil supplementing one-way valve 808 and a detection port of the first pressure sensor 814; an oil port B of the electrohydraulic proportional variable hydraulic motor 801 is communicated with an oil inlet of a hovering safety valve 806 of an A port of a hovering electromagnetic valve 805; the port B of the electro-hydraulic proportional variable pump 802 is communicated with the port P of the hovering electromagnetic valve 805, the oil outlet of the second oil supplementing one-way valve 809 and the detection port of the second pressure sensor 815; an oil outlet of the oil supplementing pump 803 is communicated with an oil inlet of the oil supplementing pressure regulating valve 804, an oil inlet of the first electromagnetic ball valve 810 and an oil inlet of the second electromagnetic ball valve 811; an oil outlet of the first electromagnetic ball valve 810 is communicated with an oil inlet of the first oil supplementing one-way valve 808 and an oil inlet of the second oil supplementing one-way valve 809; the oil outlet of the second electromagnetic ball valve 811 is communicated with the oil inlet of the balance safety valve 812, the oil inlet of the balance accumulator set 813, the rod cavity of the balance cylinder 304 and the detection port of the third pressure sensor 816; the rodless cavity of the balancing cylinder 304 is in communication with the atmosphere; an oil suction port of the oil supplementing pump 803, an oil outlet of the oil supplementing pressure regulating valve 804, an oil outlet of the hovering safety valve 806, an oil outlet of the pressing safety valve 807 and an oil outlet of the balance safety valve 812 are communicated with a hydraulic oil tank; the motor 817 is coaxially connected to the electro-hydraulic proportional variable pump 802 and the supplemental pump 803.
The displacement V of the electrohydraulic proportional variable hydraulic motor 801 can be controlled in a closed loop; the output flow Q of the electro-hydraulic proportional variable pump 802 and the A, B-port pressure difference P AB can be controlled in a closed loop manner; the rotation speed of the motor 817 can be controlled in a closed loop, and the motor 817 can be used as a motor to drag a load or can be dragged by the load to be in a generator mode; the output torque of the electrohydraulic proportional variable hydraulic motor 801 and the gear 301 is T, and the transmission ratio of the torque T and the output pressing force F of the rack 302 is i; the rotation speed of the electrohydraulic proportional variable hydraulic motor 801 and the gear 301 is n; the above parameters satisfy:
Q=n×V。
F=i×T。
PAB×V=2×π×T。
the working principle of the invention is illustrated by taking a single working cycle of the press machine:
1. Quick-down of press slide block
When the hovering electromagnetic valve 805 is electrified, the press slide block 305 moves downwards in an accelerating way under the action of gravity, the rack 302 drives the gear 301 to rotate so as to drive the coaxial electrohydraulic proportional variable hydraulic motor 801 to rotate positively, oil discharged from an oil port B of the electrohydraulic proportional variable hydraulic motor 801 enters an oil port B of the electrohydraulic proportional variable pump 802 through the hovering electromagnetic valve 805, oil output from an oil port A of the electrohydraulic proportional variable pump 802 enters an oil port A of the electrohydraulic proportional variable hydraulic motor 801, the rotating speed n of the gear 301 is higher during quick-down, the displacement V of the electrohydraulic proportional variable hydraulic motor 801 is reduced and fixed so as to limit the system flow Q, the rotating speed n of the electrohydraulic proportional variable hydraulic motor 801 is regulated by controlling the output flow Q of the electrohydraulic proportional variable hydraulic motor 802, the rotating speed of the motor 817 is controlled constantly and dragged by the electrohydraulic proportional variable pump 802 so as to be in a generator mode.
2. Press slide block working feed
The hovering electromagnetic valve 805 is electrified, the displacement V of the electro-hydraulic proportional variable hydraulic motor 801 is regulated to P AB/(2×π×F/i),PAB according to the required pressing force F, the system setting working pressure is taken, at the moment, the displacement V is increased, the rotating speed n is reduced, the electro-hydraulic proportional variable hydraulic motor 801 can output enough torque, the oil output from the port A of the electro-hydraulic proportional variable hydraulic motor 802 enters the port A of the electro-hydraulic proportional variable hydraulic motor 801, the oil discharged from the port B of the electro-hydraulic proportional variable hydraulic motor 801 enters the port B of the electro-hydraulic proportional variable pump 802 through the hovering electromagnetic valve 805, the pressing speed of the sliding block 305 is regulated by controlling the output flow Q of the electro-hydraulic proportional variable pump 802, and the rotating speed of the motor 817 is controlled to be constant, and the electro-hydraulic proportional variable pump 802 and the oil supplementing pump 803 are dragged.
3. Pressure maintaining
When the pressing force reaches a set value, the pressure maintaining control can be performed, the hovering electromagnetic valve 805 is electrified, the rotating speed of the motor 817 is regulated down, the displacement V of the electro-hydraulic proportional variable hydraulic motor 801 is kept constant, the P AB is regulated by the electro-hydraulic proportional variable pump 802 in a closed loop mode to realize the pressing force F keeping, and the pressure keeping time is set according to the process requirement.
4. Pressure relief
When the dwell time reaches a set value, the hover solenoid valve 805 is energized, gradually decreasing the displacement V of the electro-hydraulic proportional variable hydraulic motor 801 to a certain fixed value, and then gradually adjusting P AB to 0 according to a preset rule by the electro-hydraulic proportional variable pump 802, and the motor is turned to 0.
5. Press slide return stroke
After pressure relief is finished, the hovering electromagnetic valve 805 is powered off, the electro-hydraulic proportional variable pump 802 reversely outputs flow Q, oil output from the port B of the electro-hydraulic proportional variable pump 802 enters the port B of the electro-hydraulic proportional variable hydraulic motor 801 through the hovering electromagnetic valve 805, oil discharged from the port A of the electro-hydraulic proportional variable hydraulic motor 801 enters the port A of the electro-hydraulic proportional variable pump 802, at the moment, the displacement V of the electro-hydraulic proportional variable hydraulic motor 801 is smaller, so that the rotating speed n of the gear 301 is higher, the press slide 305 realizes quick return, the return speed of the slide 305 is regulated by controlling the output flow Q of the electro-hydraulic proportional variable pump 802, and the rotating speed of the motor 817 is controlled to be constant to drag the electro-hydraulic proportional variable pump 802 and the oil supplementing pump 803.
6. Pressing machine sliding block hovering
When the hover solenoid valve 805 is de-energized, the displacement V of the electro-hydraulic proportional variable hydraulic motor 801 is adjusted to a maximum value, the motor 817 is rotated to 0, the output flow Q of the electro-hydraulic proportional variable pump 802 is 0, and the press slide 305 hovers.
In the above 6 working processes, the first electromagnetic ball valve 810 and the second electromagnetic ball valve 811 are powered off, and the oil supplementing pump 803 injects hydraulic oil into the low pressure side of the closed system through the first oil supplementing one-way valve 808 or the second oil supplementing one-way valve 809 so as to supplement the hydraulic oil leaked in the working process and exchange heat and cool at the same time, and the oil supplementing pressure is set through the oil supplementing pressure regulating valve 804.
7. Balance system oil supplement
If the oil pressure in the balance accumulator set 813 is lower than the set value, the first electromagnetic ball valve 810 and the second electromagnetic ball valve 811 are electrified, the balance system oil supplementing pressure is set through the oil supplementing pressure regulating valve 804, and the oil supplementing pump 803 supplements pressure oil for the balance accumulator set 813; at this time, the hover solenoid valve 805 is de-energized, the motor 817 rotates to speed up to 0, the output flow Q of the electro-hydraulic proportional variable pump 802 is 0, the displacement V of the electro-hydraulic proportional variable hydraulic motor 801 is adjusted to a maximum value, and the press slide 305 hovers.
Part of the gravity of the slide block 305 assembly is always counteracted by the force output by the balance cylinder 304 during the operation of the press; when the sliding block 305 descends, hydraulic oil in the rodless cavity of the balance cylinder 304 enters the balance energy accumulator set 813, the pressure in the balance energy accumulator set 813 rises, and gravitational potential energy is converted into hydraulic energy; when the sliding block 305 moves upwards, hydraulic oil in the balance accumulator set 813 enters the rodless cavity of the balance cylinder 304, the pressure in the balance accumulator set 813 is reduced, and the hydraulic energy is converted into gravitational potential energy. Because leakage of the hydraulic system is unavoidable, the pressure in the balance accumulator set 813 will decrease after long-term use, and the balance accumulator set 813 can be complemented by energizing the first electromagnetic ball valve 810 and the second electromagnetic ball valve 811.
Claims (1)
1. A closed electrohydraulic control system of a hydraulic motor driven press is characterized in that: mainly comprises the following steps: an electrohydraulic proportional variable hydraulic motor (801), an electrohydraulic proportional variable pump (802), a make-up pump (803), a make-up pressure regulating valve (804), a hover solenoid valve (805), a hover relief valve (806), a press relief valve (807), a first make-up one-way valve (808), a second make-up one-way valve (809), a first solenoid valve (810), a second solenoid valve (811), a balance relief valve (812), a balance accumulator set (813), a first pressure sensor (814), A second pressure sensor (815), a third pressure sensor (816), a motor (817); an output shaft of the electrohydraulic proportional variable hydraulic motor (801) is coaxially connected with the gear (301); an oil port A of the electro-hydraulic proportional variable hydraulic motor (801) is communicated with an A port of the electro-hydraulic proportional variable pump (802), an oil inlet of a pressing safety valve (807), an oil outlet of a first oil supplementing one-way valve (808) and a detection port of a first pressure sensor (814); an oil port B of the electrohydraulic proportional variable hydraulic motor (801) is communicated with an A port of a hovering electromagnetic valve (805) and an oil inlet of a hovering safety valve (806); the port B of the electro-hydraulic proportional variable pump (802) is communicated with the port P of the hovering electromagnetic valve (805), the oil outlet of the second oil supplementing one-way valve (809) and the detection port of the second pressure sensor (815); an oil outlet of the oil supplementing pump (803) is communicated with an oil inlet of the oil supplementing pressure regulating valve (804), an oil inlet of the first electromagnetic ball valve (810) and an oil inlet of the second electromagnetic ball valve (811); an oil outlet of the first electromagnetic ball valve (810) is communicated with an oil inlet of the first oil supplementing one-way valve (808) and an oil inlet of the second oil supplementing one-way valve (809); an oil outlet of the second electromagnetic ball valve (811) is communicated with an oil inlet of the balance safety valve (812), an oil port of the balance energy accumulator group (813), a rod cavity of the balance cylinder (304) and a detection port of the third pressure sensor (816); the rodless cavity of the balance cylinder (304) is communicated with the atmosphere; an oil suction port of the oil supplementing pump (803), an oil outlet of the oil supplementing pressure regulating valve (804), an oil outlet of the hovering safety valve (806), an oil outlet of the pressing safety valve (807) and an oil outlet of the balance safety valve (812) are communicated with a hydraulic oil tank; the motor (817) is coaxially connected with the electro-hydraulic proportional variable pump (802) and the oil supplementing pump (803); the displacement V of the electrohydraulic proportional variable hydraulic motor (801) can be controlled in a closed loop; the output flow Q of the electro-hydraulic proportional variable pump (802) and the pressure difference P AB of A, B ports can be controlled in a closed loop manner; the rotating speed of the motor (817) can be controlled in a closed loop, and the motor can be used as a motor to drag a load or can be dragged by the load to be in a generator mode; the output torque of the electrohydraulic proportional variable hydraulic motor (801) and the gear (301) is T, and the transmission ratio of the torque T and the output pressing force F of the rack (302) is i; the rotation speed of the electrohydraulic proportional variable hydraulic motor (801) and the gear (301) is n; the above parameters satisfy:
Q=n×V，
F=i×T，
PAB×V=2×π×T；
The control step of the press comprises the following steps:
Step 1: the hovering electromagnetic valve (805) is electrified, the rotating speed n of the gear (301) is higher when the press slide block (305) is fast down, the displacement V of the electro-hydraulic proportional variable hydraulic motor (801) is regulated to be smaller and fixed so as to limit the system flow Q, the rotating speed n of the electro-hydraulic proportional variable hydraulic motor (801) is regulated by controlling the output flow Q of the electro-hydraulic proportional variable pump (802), the purpose of controlling the fast down speed of the press slide block (305) is achieved, in the step, oil output from the A port of the electro-hydraulic proportional variable pump (802) enters the oil port A of the electro-hydraulic proportional variable hydraulic motor (801), oil discharged from the oil port B of the electro-hydraulic proportional variable hydraulic motor (801) enters the B port of the electro-hydraulic proportional variable pump (802) through the hovering electromagnetic valve (805), and the rotating speed of the motor (817) is controlled to be constant and dragged by the electro-hydraulic proportional variable pump (802) so as to be in a generator mode;
Step 2: the method comprises the steps that a hover electromagnetic valve (805) is electrified, according to the required pressing force F, the displacement V of an electro-hydraulic proportional variable hydraulic motor (801) is regulated to P AB/(2×π×F/i),PAB to obtain the system set working pressure, at the moment, the displacement V is increased, the rotating speed n is reduced, the electro-hydraulic proportional variable hydraulic motor (801) can output enough torque, the pressing speed of a sliding block (305) is regulated by controlling the output flow Q of an electro-hydraulic proportional variable pump (802), oil output from an A port of the electro-hydraulic proportional variable pump (802) enters an oil port A of the electro-hydraulic proportional variable hydraulic motor (801), oil discharged from an oil port B of the electro-hydraulic proportional variable hydraulic motor (801) enters a B port of the electro-hydraulic proportional variable pump (802) through the hover electromagnetic valve (805), and the rotating speed of a motor (817) is controlled to be constant, and drags the electro-hydraulic proportional variable pump (802) and a supplementary oil pump (803);
step 3: a hovering electromagnetic valve (805) is electrified, a press slide block (305) presses a workpiece to set working pressure, the rotating speed of a motor (817) is reduced, and P AB is closed-loop regulated by an electrohydraulic proportional variable pump (802) to realize the holding of pressing force F;
Step 4: the hovering electromagnetic valve (805) is electrified, the displacement V of the electrohydraulic proportional variable hydraulic motor (801) is gradually reduced to a certain fixed value, then P AB is gradually regulated to 0 through the electrohydraulic proportional variable pump (802), and the rotating speed of the motor (817) is regulated to 0;
Step 5: the hovering electromagnetic valve (805) is powered off, the electro-hydraulic proportional variable pump (802) reversely outputs flow Q, at the moment, the displacement V of the electro-hydraulic proportional variable hydraulic motor (801) is smaller, so that the rotating speed n of the gear (301) is higher, the press sliding block (305) realizes quick return, the return speed of the sliding block (305) is regulated by controlling the output flow Q of the electro-hydraulic proportional variable pump (802), in the step, oil output from the port B of the electro-hydraulic proportional variable pump (802) enters the oil port B of the electro-hydraulic proportional variable hydraulic motor (801) through the hovering electromagnetic valve (805), oil discharged from the oil port A of the electro-hydraulic proportional variable hydraulic motor (801) enters the port A of the electro-hydraulic proportional variable pump (802), and the rotating speed of the motor (817) is controlled to be constant, and drags the electro-hydraulic proportional variable pump (802) and the oil supplementing pump (803);
step 6: the hover electromagnetic valve (805) is powered off, the displacement V of the electro-hydraulic proportional variable hydraulic motor (801) is regulated to the maximum value, the motor (817) is regulated to 0 in a rotating way, the output flow Q of the electro-hydraulic proportional variable pump (802) is 0, and the press slide block (305) is hovered;
In the process of steps 1 to 6, the first electromagnetic ball valve (810) and the second electromagnetic ball valve (811) are powered off, the oil supplementing pump (803) injects hydraulic oil into the low pressure side of the closed system through the first oil supplementing one-way valve (808) or the second oil supplementing one-way valve (809) so as to supplement the hydraulic oil leaked in the working process and exchange heat and cool at the same time, and the oil supplementing pressure is set through the oil supplementing pressure regulating valve (804);
Step 7: if the oil pressure in the balance energy accumulator set (813) is lower than a set value, the first electromagnetic ball valve (810) and the second electromagnetic ball valve (811) are electrified, the oil supplementing pressure of the balance system is set through the oil supplementing pressure regulating valve (804), and the oil supplementing pump (803) supplements pressure oil for the balance energy accumulator set (813); at the moment, the hovering electromagnetic valve (805) is powered off, the motor (817) rotates to be 0, the output flow Q of the electro-hydraulic proportional variable pump (802) is 0, the displacement V of the electro-hydraulic proportional variable hydraulic motor (801) is regulated to be the maximum value, and the press sliding block (305) hovers.
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