CN104999695B - A kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation - Google Patents
A kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation Download PDFInfo
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- CN104999695B CN104999695B CN201510330259.7A CN201510330259A CN104999695B CN 104999695 B CN104999695 B CN 104999695B CN 201510330259 A CN201510330259 A CN 201510330259A CN 104999695 B CN104999695 B CN 104999695B
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Abstract
The invention discloses a kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation, mainly include the resistance of hydraulic pump, overflow valve, check valve, three way flow control valve, the first two-way valve, adjustable liquid, the second two-way valve, the 3rd two-way valve, support valve, main hydraulic cylinder and kicker cylinder.Advanced section of hydraulic press Ultra-Low Speed work, this electrohydraulic control system has a road hydraulic oil to enter kicker cylinder through hydraulic pump, check valve, the resistance of adjustable liquid and the second two-way valve all the time, make to support valve and remain able to maintain certain opening advanced section of Ultra-Low Speed work, the wild effect opened when breaking when avoiding occurring because flow is the least, it is ensured that hydraulic press Ultra-Low Speed traveling comfort.It is furnished with three way flow control valve on the in-line of main hydraulic cylinder, allow the invention to the oil-feed flow at the effective control main hydraulic cylinder of advanced section of Ultra-Low Speed work, thus ensure that hydraulic press can be according to velocity of displacement curve set in advance or displacement press power curve motion.
Description
Technical field
The Ultra-Low Speed that the present invention relates to a kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation, particularly isothermal forging hydropress runs electrohydraulic control system.
Background technology
Hydraulic press, particularly isothermal forging hydropress, due to its specific operating mode, it usually needs Ultra-Low Speed runs.Due in advanced section of Ultra-Low Speed work (up to 0.001mm/s), the draining flow of kicker cylinder is the least, not enough so that supporting the opening that valve remains certain, thus cause supporting the labile state opened when breaking when valve is in, and then make the main hydraulic cylinder under this operating mode and running speed of sliding block unstable, destroy the grain flow rule of inside workpiece, affect the Forming Quality of workpiece.How to make hydraulic press remain able to stable operation advanced section of Ultra-Low Speed work, be hydraulic press Electro-hydraulic Control System Design, the key factor that particularly must take in isothermal forging hydropress Electro-hydraulic Control System Design.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of electrohydraulic control system that can effectively realize hydraulic press Ultra-Low Speed stable operation.
nullThe technical solution adopted for the present invention to solve the technical problems is as follows: the electrohydraulic control system of hydraulic press Ultra-Low Speed stable operation of the present invention includes hydraulic pump、Overflow valve、Check valve、Three way flow control valve、First two-way valve、Adjustable liquid hinders、Second two-way valve、3rd two-way valve、Support valve、Main hydraulic cylinder and kicker cylinder，The oil-out of hydraulic pump respectively with the P mouth of overflow valve、The oil-in connection of check valve，The T mouth of overflow valve connects with the fuel tank of hydraulic press，The oil-out of check valve respectively with the P mouth of three way flow control valve、The A mouth connection of adjustable liquid resistance，The T mouth of three way flow control valve connects with described fuel tank，The A mouth of three way flow control valve and the P mouth connection of the first two-way valve，The A mouth of the first two-way valve connects with main hydraulic cylinder，The B mouth of adjustable liquid resistance and the P mouth connection of the second two-way valve，The A mouth of the second two-way valve connects with kicker cylinder，The A mouth connection of kicker cylinder and the 3rd two-way valve，The P mouth of the 3rd two-way valve connects with the P mouth supporting valve，The T mouth supporting valve connects with described fuel tank.
Further, present invention additionally comprises the first pressure transducer, the second pressure transducer and displacement transducer, described first pressure transducer connects with main hydraulic cylinder, and the second pressure transducer connects with kicker cylinder, and institute's displacement sensors is installed on main hydraulic cylinder.
Further, present invention additionally comprises control system, described control system can be used in: gathers the pressure signal in main hydraulic cylinder and kicker cylinder, gather the displacement signal of main hydraulic cylinder, control the first two-way valve, the second two-way valve and the magnet switching of the 3rd two-way valve, and control the openings of sizes of three way flow control valve.
Further, control system of the present invention is PLC control system.
Further, PLC control system of the present invention includes AI module, DO module and AO module, described AI module electrically connects with the first pressure transducer, the second pressure transducer, displacement transducer respectively, described DO module electrically connects with the first two-way valve, the second two-way valve, the 3rd two-way valve respectively, and described AO module electrically connects with three way flow control valve.
Further, present invention additionally comprises man machine interface, described man machine interface is connected by fieldbus with control system.
Further, three way flow control valve of the present invention is servo proportion, proportioning valve or servo valve.
Further, adjustable liquid of the present invention resistance is manual throttle valve, manual governing valve, proportional throttle valve or proportional velocity regulating valve.
Further, support valve of the present invention is manual overflow valve or proportional pressure control valve.
Compared with prior art, beneficial effects of the present invention is as follows:
1. advanced section of hydraulic press Ultra-Low Speed work, all the time a road hydraulic oil is had to enter kicker cylinder through hydraulic pump, check valve, the resistance of adjustable liquid and the second two-way valve, make to support valve and remain able to maintain certain opening advanced section of Ultra-Low Speed work, the wild effect opened when breaking when avoiding occurring because flow is the least, it is ensured that hydraulic press Ultra-Low Speed traveling comfort.
2. it is furnished with three way flow control valve on the in-line of main hydraulic cylinder, allow the invention to the oil-feed flow at the effective control main hydraulic cylinder of advanced section of Ultra-Low Speed work, and then controlling the speed of service of main hydraulic cylinder so that hydraulic press runs according to displacement set in advance-rate curve.
3. it is furnished with three way flow control valve on the in-line of main hydraulic cylinder so that the present invention can not only realize speed controlling advanced section of Ultra-Low Speed work, moreover it is possible to is switched to press power control as required so that hydraulic press is according to displacement set in advance-press power curve motion.
Accompanying drawing explanation
Fig. 1 is the hydraulic schematic diagram of a kind of embodiment of electrohydraulic control system of the present invention.
Fig. 2 is the schematic diagram of a kind of embodiment of electrohydraulic control system of the present invention.
Fig. 3 is the speed controlling schematic diagram advanced section of Ultra-Low Speed work of the electrohydraulic control system shown in Fig. 2.
Fig. 4 is the press power control principle drawing advanced section of Ultra-Low Speed work of the electrohydraulic control system shown in Fig. 2.
In figure: 1. hydraulic pump, 2. overflow valve, 3. check valve, 4. servo proportion, 5. the first two-way valve, the most adjustable liquid hinders, 7. the second two-way valve, 8. the 3rd two-way valve, 9. kicker cylinder supports valve, 10. main hydraulic cylinder, 11. slide blocks, 12. kicker cylinders, 13. first pressure transducers, 14. second pressure transducers, 15. displacement transducers, 16. man machine interfaces, 17.PLC control system.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the accompanying drawings.
In the present invention, the one during three way flow control valve can be servo proportion 4, proportioning valve, servo valve etc..Below as a example by three way flow control valve is for servo proportion 4, illustrate the structure of electrohydraulic control system of the present invention.
See Fig. 1, as a kind of embodiment of electrohydraulic control system of the present invention, the invention mainly comprises hydraulic pump 1, overflow valve 2, check valve 3, servo proportion the 4, first two-way valve 5, adjustable liquid resistance the 6, second two-way valve the 7, the 3rd two-way valve 8, support valve 9, main hydraulic cylinder 10 and kicker cylinder 12.Wherein, the oil-out of hydraulic pump 1 connects with the P mouth of overflow valve 2 and the oil-in of check valve 3 respectively, the fuel tank of the T mouth connection hydraulic press of overflow valve 2, the oil-out of check valve 3 connects with the P mouth of servo proportion 4 and the A mouth of adjustable liquid resistance 6 respectively, the B mouth of servo proportion 4 blocks, the fuel tank of the T mouth connection hydraulic press of servo proportion 4, the A mouth of servo proportion 4 and the P mouth connection of the first two-way valve 5, the A mouth of the first two-way valve 5 connects with main hydraulic cylinder 10, the B mouth of adjustable liquid resistance 6 and the P mouth connection of the second two-way valve 7, the A mouth of the second two-way valve 7 connects with kicker cylinder 12, kicker cylinder 12 connects with the A mouth of the 3rd two-way valve 8, the P mouth of the 3rd two-way valve 8 connects with the P mouth supporting valve 9, support the fuel tank of the T mouth connection hydraulic press of valve 9.In the present invention, adjustable liquid resistance 6 can be manual throttle valve, manual governing valve, proportional throttle valve, proportional velocity regulating valve etc.；Supporting valve 9 can be manual overflow valve, proportional pressure control valve etc..
Seeing Fig. 2, as one embodiment of the present invention, electrohydraulic control system also includes the first pressure transducer the 13, second pressure transducer 14 and displacement transducer 15.Wherein, the first pressure transducer 13 connects with main hydraulic cylinder 10, and the second pressure transducer 14 connects with kicker cylinder 12, and displacement transducer 15 is installed on main hydraulic cylinder 10.Further, electrohydraulic control system of the present invention also includes control system, described control system can be used in: gathers the pressure signal in main hydraulic cylinder 10 and kicker cylinder 12, gather the displacement signal of main hydraulic cylinder 10, control the first two-way valve the 5, second two-way valve 7 and magnet switching of the 3rd two-way valve 8, and control the openings of sizes of servo proportion 4.Specifically, described control system can be PLC control system 17, and further, PLC control system 17 is containing AI module, DO module and AO module.During use, the AI module of PLC control system 17 can be electrically connected with first pressure transducer the 13, second pressure transducer 14, displacement transducer 15 respectively, the DO module of PLC control system 17 electrically connects with first two-way valve the 5, second two-way valve the 7, the 3rd two-way valve 8 respectively, and the AO module of PLC control system 17 electrically connects with servo proportion 4.As the preferred embodiment of the present invention, PLC control system 17 can be connected by fieldbus with man machine interface 16.
See Fig. 2, when electrohydraulic control system of the present invention is applied to hydraulic press, can by main hydraulic cylinder 10 and kicker cylinder 12 respectively slide block 11 with hydraulic press be fixed together.
During work, pressure in the main hydraulic cylinder 10 of the present invention can be by measured by the first pressure transducer 13 being arranged on pipeline, the displacement of main hydraulic cylinder 10 can be by measured by the displacement transducer 15 being arranged on main hydraulic cylinder 10, pressure in kicker cylinder 12 can be by measured by the second pressure transducer 14 being arranged on pipeline, input and some basic parameters of display hydraulic press are mainly responsible in man machine interface 16, carrying out communication by fieldbus between it and PLC control system 17, PLC control system 17 is mainly responsible for the work such as the action control of hydraulic press, data acquisition.PLC control system 17 is gathered from the pressure signal in the main hydraulic cylinder 10 and kicker cylinder 12 of first pressure transducer the 13, second pressure transducer 14 and the displacement signal of the main hydraulic cylinder 10 from displacement transducer 15 by AI module, PLC control system 17 controls the first two-way valve the 5, second two-way valve 7 and magnet switching of the 3rd two-way valve 8 by DO module, and PLC control system 17 controls the openings of sizes of servo proportion 4 by AO module.
Seeing Fig. 1, Fig. 2, the operation principle of electrohydraulic control system of the present invention is as follows:
Advanced section of Ultra-Low Speed work, the electric magnet that PLC control system 17 controls first two-way valve the 5, second two-way valve 7 and the 3rd two-way valve 8 by DO module obtains electric: hydraulic oil enters main hydraulic cylinder 10 through hydraulic pump 1, check valve 3, servo proportion the 4, first two-way valve 5, drives main hydraulic cylinder 10 down to run；Hydraulic oil in kicker cylinder 12 through the 3rd two-way valve 8, support valve 9 and flow back to the fuel tank of hydraulic press；PLC control system 17 controls to enter the flow of main hydraulic cylinder 10 by the openings of sizes controlling servo proportion 4, thus controls the speed of service of main hydraulic cylinder 10.Additionally, advanced section of Ultra-Low Speed work, also a road hydraulic oil enters kicker cylinder 12 through hydraulic pump 1, check valve 3, adjustable liquid resistance 6 and the second two-way valve 7.Therefore, under the conditions of Ultra-Low Speed work is entered, still there is a road continuous print hydraulic oil through the 3rd two-way valve 8 in kicker cylinder 12, support valve 9 and flow back to the fuel tank of hydraulic press, make to support the opening that valve 9 remains able to maintain certain under the conditions of Ultra-Low Speed work is entered, the wild effect opened when breaking when avoiding occurring because flow is the least, it is ensured that hydraulic press Ultra-Low Speed traveling comfort.
Seeing Fig. 3, the electrohydraulic control system shown in Fig. 2 is as follows in the speed controlling principle of advanced section of Ultra-Low Speed work:
nullPLC control system 17 passes through the AI module Real-time Collection displacement signal from the main hydraulic cylinder 10 of displacement transducer 15，And correspondingly calculate the present speed signal of main hydraulic cylinder 10，Present bit shifting signal and displacement-rate curve set in advance according to main hydraulic cylinder 10 are tabled look-up and are obtained current speed command，The present speed signal of gained speed command with main hydraulic cylinder 10 is compared，Obtain the present speed deviation of main hydraulic cylinder 10，The speed control of PLC control system 17 receives this velocity deviation，And calculate open order according to certain control algolithm (such as pid control algorithm)，The openings of sizes of servo proportion 4 is controlled according to this open order，Go to drive main hydraulic cylinder 10 as total driving flow using the flow of the hydraulic oil through servo proportion 4，Hydraulic press is run according to displacement set in advance-rate curve.
Seeing Fig. 4, the electrohydraulic control system shown in Fig. 2 is as follows at the press power control principle of advanced section of Ultra-Low Speed work:
nullPLC control system 17 passes through AI module Real-time Collection respectively from the first pressure transducer 13、Pressure signal in the main hydraulic cylinder 10 of the second pressure transducer 14 and kicker cylinder 12 and the displacement signal of the main hydraulic cylinder 10 from displacement transducer 15，And correspondingly calculate the current press power of hydraulic press，Present bit shifting signal and displacement set in advance-press power curve according to main hydraulic cylinder 10 are tabled look-up and are obtained current press power instruction，The instruction of gained press power is compared with the current press power of hydraulic press，Obtain the current press power deviation of hydraulic press，The press power controller of PLC control system 17 receives this press power deviation，And calculate open order according to certain control algolithm (such as pid control algorithm)，The openings of sizes of servo proportion 4 is controlled according to this open order，Go to drive main hydraulic cylinder 10 as total driving flow using the flow of the hydraulic oil through servo proportion 4，Make hydraulic press according to displacement set in advance-press power curve motion.
Claims (19)
- null1. the electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation，It is characterized in that: include hydraulic pump (1)、Overflow valve (2)、Check valve (3)、Three way flow control valve、First two-way valve (5)、Adjustable liquid resistance (6)、Second two-way valve (7)、3rd two-way valve (8)、Support valve (9)、Main hydraulic cylinder (10) and kicker cylinder (12)，The oil-out of hydraulic pump (1) respectively with the P mouth of overflow valve (2)、The oil-in connection of check valve (3)，The T mouth of overflow valve (2) connects with the fuel tank of hydraulic press，The oil-out of check valve (3) respectively with the P mouth of three way flow control valve、The A mouth connection of adjustable liquid resistance (6)，The T mouth of three way flow control valve connects with described fuel tank，The A mouth of three way flow control valve and the P mouth connection of the first two-way valve (5)，The A mouth of the first two-way valve (5) connects with main hydraulic cylinder (10)，The B mouth of adjustable liquid resistance (6) and the P mouth connection of the second two-way valve (7)，The A mouth of the second two-way valve (7) connects with kicker cylinder (12)，Kicker cylinder (12) connects with the A mouth of the 3rd two-way valve (8)，The P mouth of the 3rd two-way valve (8) connects with the P mouth supporting valve (9)，The T mouth supporting valve (9) connects with described fuel tank.
- A kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation the most according to claim 1, it is characterized in that: also include the first pressure transducer (13), the second pressure transducer (14) and displacement transducer (15), described first pressure transducer (13) connects with main hydraulic cylinder (10), second pressure transducer (14) connects with kicker cylinder (12), and institute's displacement sensors (15) is installed on main hydraulic cylinder (10).
- A kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation the most according to claim 1 and 2, it is characterized in that: also include control system, described control system can be used in: gathers the pressure signal in main hydraulic cylinder (10) and kicker cylinder (12), gather the displacement signal of main hydraulic cylinder (10), control the first two-way valve (5), the second two-way valve (7) and the magnet switching of the 3rd two-way valve (8), and control the openings of sizes of three way flow control valve.
- A kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation the most according to claim 3, it is characterised in that: described control system is PLC control system (17).
- A kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation the most according to claim 4, it is characterized in that: described PLC control system (17) includes AI module, DO module and AO module, described AI module electrically connects with the first pressure transducer (13), the second pressure transducer (14), displacement transducer (15) respectively, described DO module electrically connects with the first two-way valve (5), the second two-way valve (7), the 3rd two-way valve (8) respectively, and described AO module electrically connects with three way flow control valve.
- A kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation the most according to claim 3, it is characterised in that: also include that man machine interface (16), described man machine interface (16) are connected by fieldbus with control system.
- 7. according to a kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation described in claim 4 or 5, it is characterised in that: also include that man machine interface (16), described man machine interface (16) are connected by fieldbus with control system.
- 8. according to a kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation described in claim 1,2,4,5 or 6, it is characterised in that: described three way flow control valve is servo proportion (4), proportioning valve or servo valve.
- A kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation the most according to claim 3, it is characterised in that: described three way flow control valve is servo proportion (4), proportioning valve or servo valve.
- A kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation the most according to claim 7, it is characterised in that: described three way flow control valve is servo proportion (4), proportioning valve or servo valve.
- 11. according to a kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation described in claim 1,2,4,5,6,9 or 10, it is characterised in that: described adjustable liquid resistance (6) is manual throttle valve, manual governing valve, proportional throttle valve or proportional velocity regulating valve.
- 12. a kind of electrohydraulic control systems realizing hydraulic press Ultra-Low Speed stable operation according to claim 3, it is characterised in that: described adjustable liquid resistance (6) is manual throttle valve, manual governing valve, proportional throttle valve or proportional velocity regulating valve.
- 13. a kind of electrohydraulic control systems realizing hydraulic press Ultra-Low Speed stable operation according to claim 7, it is characterised in that: described adjustable liquid resistance (6) is manual throttle valve, manual governing valve, proportional throttle valve or proportional velocity regulating valve.
- 14. a kind of electrohydraulic control systems realizing hydraulic press Ultra-Low Speed stable operation according to claim 8, it is characterised in that: described adjustable liquid resistance (6) is manual throttle valve, manual governing valve, proportional throttle valve or proportional velocity regulating valve.
- 15. want a kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation described in 1,2,4,5,6,9,10,12,13 or 14 according to right, it is characterised in that: described support valve (9) is manual overflow valve or proportional pressure control valve.
- 16. want a kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation described in 3 according to right, it is characterised in that: described support valve (9) is manual overflow valve or proportional pressure control valve.
- 17. want a kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation described in 7 according to right, it is characterised in that: described support valve (9) is manual overflow valve or proportional pressure control valve.
- 18. want a kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation described in 8 according to right, it is characterised in that: described support valve (9) is manual overflow valve or proportional pressure control valve.
- 19. want a kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation described in 11 according to right, it is characterised in that: described support valve (9) is manual overflow valve or proportional pressure control valve.
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| CN106122186B (en) * | 2016-08-29 | 2018-06-26 | 南通锻压设备股份有限公司 | A kind of hydraulic system for realizing the stepless accurate speed governing of hydraulic press |
| CN107524662B (en) * | 2017-10-12 | 2023-06-23 | 南通锻压设备如皋有限公司 | Hydraulic energy recovery and sliding block gravity balance system |
| CN108427290B (en) * | 2018-06-06 | 2023-06-23 | 南通锻压设备如皋有限公司 | Hydraulic press slide block parallel motion control system and control method |
| CN111896194A (en) * | 2020-07-29 | 2020-11-06 | 博众精工科技股份有限公司 | Pressing method, device, equipment and storage medium |
| CN112277375B (en) * | 2020-08-27 | 2022-11-22 | 天津市天锻压力机有限公司 | Process forming method of powder forming hydraulic press |
| CN117621533B (en) * | 2024-01-26 | 2024-04-19 | 南通锻压设备如皋有限公司 | Control method for quick descending of composite material hydraulic press sliding block |
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