CN104999695A - Electro-hydraulic control system capable of achieving ultralow-speed stable running of hydraulic machine - Google Patents
Electro-hydraulic control system capable of achieving ultralow-speed stable running of hydraulic machine Download PDFInfo
- Publication number
- CN104999695A CN104999695A CN201510330259.7A CN201510330259A CN104999695A CN 104999695 A CN104999695 A CN 104999695A CN 201510330259 A CN201510330259 A CN 201510330259A CN 104999695 A CN104999695 A CN 104999695A
- Authority
- CN
- China
- Prior art keywords
- valve
- control system
- mouth
- communicated
- hydraulic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses an electro-hydraulic control system capable of achieving ultralow-speed stable running of a hydraulic machine. The electro-hydraulic control system mainly comprises a hydraulic pump, an overflow valve, a check valve, a three-way flow control valve, a first two-way ball valve, an adjustable fluidic resistor, a second two-way ball valve, a third two-way ball valve, a supporting valve, a main hydraulic cylinder and a return cylinder. At the ultralow-speed feeding stage of the hydraulic machine, the electro-hydraulic control system has a route of hydraulic oil entering the return cylinder through the hydraulic pump, the check valve, the adjustable fluidic resistor and the second two-way ball valve all the time, and therefore a certain opening can still be kept at the ultralow-speed feeding stage of the hydraulic machine, the unstable phenomenon that the hydraulic oil is intermittent when the flow is too small is avoided, and stability of the ultralow-speed running of the hydraulic machine is ensured. The three-way flow control valve is arranged on an oil inlet route of the main hydraulic cylinder, and therefore the oil inlet flow of the main hydraulic cylinder can be effectively controlled at the ultralow-speed feeding stage, and it is ensured that the hydraulic machine can run according to a preset displacement-speed curve or a displacement-pressing force curve.
Description
Technical field
The Ultra-Low Speed that the present invention relates to a kind of electrohydraulic control system realizing the stable operation of hydraulic press Ultra-Low Speed, particularly isothermal forging hydropress runs electrohydraulic control system.
Background technology
Hydraulic press, particularly isothermal forging hydropress, due to its specific operating mode, need Ultra-Low Speed to run usually.Due to advanced section of Ultra-Low Speed work (can 0.001mm/s be reached), the draining flow of kicker cylinder is very little, be not enough to the opening making sutaining valve remain certain, thus the labile state opened when breaking when causing sutaining valve to be in, and then make the main hydraulic cylinder under this operating mode and running speed of sliding block not steady, destroy the grain flow rule of inside workpiece, affect the Forming Quality of workpiece.How making hydraulic press still can stable operation advanced section of Ultra-Low Speed work, be hydraulic press Electro-hydraulic Control System Design, the key factor particularly must considered in isothermal forging hydropress Electro-hydraulic Control System Design.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of electrohydraulic control system that effectively can realize the stable operation of hydraulic press Ultra-Low Speed.
The 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 of the present invention stable operation comprises hydraulic pump, overflow valve, check valve, three way flow control valve, first two-way valve, adjustable liquid resistance, second two-way valve, 3rd two-way valve, sutaining valve, main hydraulic cylinder and kicker cylinder, the oil-out of hydraulic pump respectively with the P mouth of overflow valve, the oil-in of check valve is communicated with, and the T mouth of overflow valve is communicated 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 of adjustable liquid resistance is communicated with, the T mouth of three way flow control valve is communicated with described fuel tank, the A mouth of three way flow control valve is communicated with the P mouth of the first two-way valve, the A mouth of the first two-way valve is communicated with main hydraulic cylinder, the B mouth of adjustable liquid resistance is communicated with the P mouth of the second two-way valve, and the A mouth of the second two-way valve is communicated with kicker cylinder, and kicker cylinder is communicated with the A mouth of the 3rd two-way valve, the P mouth of the 3rd two-way valve is communicated with the P mouth of sutaining valve, and the T mouth of sutaining valve is communicated with described fuel tank.
Further, the present invention also comprises the first pressure sensor, the second pressure sensor and displacement transducer, and described first pressure sensor is communicated with main hydraulic cylinder, and the second pressure sensor is communicated with kicker cylinder, and institute's displacement sensors is installed on main hydraulic cylinder.
Further, the present invention also comprises control system, described control system can be used in: gather the pressure signal in main hydraulic cylinder and kicker cylinder, gather the displacement signal of main hydraulic cylinder, control the magnet switching of the first two-way valve, the second two-way valve and 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 comprises AI module, DO module and AO module, described AI module is electrically connected with the first pressure sensor, the second pressure sensor, displacement transducer respectively, described DO module is electrically connected with the first two-way valve, the second two-way valve, the 3rd two-way valve respectively, and described AO module is electrically connected with three way flow control valve.
Further, the present invention also comprises man-machine interface, and 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 resistance of the present invention is manual throttle valve, manual governing valve, proportional throttle valve or proportional velocity regulating valve.
Further, sutaining valve of the present invention is manual overflow valve or proportional pressure control valve.
Compared with prior art, beneficial effect 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 sutaining valve still can maintain certain opening advanced section of Ultra-Low Speed work, avoid the wild effect opened when breaking when occurring because flow is too little, ensure hydraulic press Ultra-Low Speed traveling comfort.
2. the in-line of main hydraulic cylinder is furnished with three way flow control valve, make the present invention effectively can control the oil-feed flow of main hydraulic cylinder advanced section of Ultra-Low Speed work, and then control the speed of service of main hydraulic cylinder, hydraulic press is run according to the displacement preset-rate curve.
3. the in-line of main hydraulic cylinder is furnished with three way flow control valve, make the present invention can not only realize speeds control advanced section of Ultra-Low Speed work, press power can also be switched to as required control, make hydraulic press according to the displacement preset-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 for the electrohydraulic control system shown in Fig. 2 is at the speeds control schematic diagram of advanced section of Ultra-Low Speed work.
Fig. 4 is for the electrohydraulic control system shown in Fig. 2 is at the press power control principle drawing of advanced section of Ultra-Low Speed work.
In figure: 1. hydraulic pump, 2. overflow valve, 3. check valve, 4. servo proportion, 5. the first two-way valve, 6. adjustable liquid resistance, 7. the second two-way valve, 8. the 3rd two-way valve, 9. kicker cylinder sutaining valve, 10. main hydraulic cylinder, 11. slide blocks, 12. kicker cylinders, 13. first pressure sensors, 14. second pressure sensors, 15. displacement transducers, 16. man-machine interfaces, 17.PLC control system.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further illustrated.
In the present invention, three way flow control valve can be the one in servo proportion 4, proportioning valve, servo valve etc.Be servo proportion 4 below with three way flow control valve be example, 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 present invention mainly comprises hydraulic pump 1, overflow valve 2, check valve 3, servo proportion 4, first two-way valve 5, the resistance of adjustable liquid the 6, second two-way valve 7, the 3rd two-way valve 8, sutaining valve 9, main hydraulic cylinder 10 and kicker cylinder 12.Wherein, the oil-out of hydraulic pump 1 is communicated with the P mouth of overflow valve 2 and the oil-in of check valve 3 respectively, the T mouth of overflow valve 2 is communicated with the fuel tank of hydraulic press, the A mouth that the oil-out of check valve 3 hinders 6 with the P mouth of servo proportion 4 and adjustable liquid is respectively communicated with, the B mouth of servo proportion 4 blocks, the T mouth of servo proportion 4 is communicated with the fuel tank of hydraulic press, the A mouth of servo proportion 4 is communicated with the P mouth of the first two-way valve 5, the A mouth of the first two-way valve 5 is communicated with main hydraulic cylinder 10, the B mouth of adjustable liquid resistance 6 is communicated with the P mouth of the second two-way valve 7, the A mouth of the second two-way valve 7 is communicated with kicker cylinder 12, kicker cylinder 12 is communicated with the A mouth of the 3rd two-way valve 8, the P mouth of the 3rd two-way valve 8 is communicated with the P mouth of sutaining valve 9, the T mouth of sutaining valve 9 is communicated with the fuel tank of hydraulic press.In the present invention, adjustable liquid resistance 6 can be manual throttle valve, manual governing valve, proportional throttle valve, proportional velocity regulating valve etc.; Sutaining valve 9 can be manual overflow valve, proportional pressure control valve etc.
See Fig. 2, as one embodiment of the present invention, electrohydraulic control system also comprises the first pressure sensor 13, second pressure sensor 14 and displacement transducer 15.Wherein, the first pressure sensor 13 is communicated with main hydraulic cylinder 10, and the second pressure sensor 14 is communicated with kicker cylinder 12, and displacement transducer 15 is installed on main hydraulic cylinder 10.Further, electrohydraulic control system of the present invention also comprises control system, described control system can be used in: gather the pressure signal in main hydraulic cylinder 10 and kicker cylinder 12, gather the displacement signal of main hydraulic cylinder 10, control the magnet switching of the first two-way valve 5, second two-way valve 7 and the 3rd two-way valve 8, and control the openings of sizes of servo proportion 4.Particularly, 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 the first pressure sensor 13, second pressure sensor 14, displacement transducer 15 respectively, the DO module of PLC control system 17 is electrically connected with the first two-way valve 5, second two-way valve 7, the 3rd two-way valve 8 respectively, and the AO module of PLC control system 17 is electrically connected 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, main hydraulic cylinder 10 and kicker cylinder 12 can be fixed together with the slide block 11 of hydraulic press respectively.
During work, pressure in main hydraulic cylinder 10 of the present invention can measured by the first pressure sensor 13 be arranged on pipeline, the displacement of main hydraulic cylinder 10 can measured by the displacement transducer 15 be arranged on main hydraulic cylinder 10, pressure in kicker cylinder 12 can measured by the second pressure sensor 14 be arranged on pipeline, some basic parameters of the input of man-machine interface 16 primary responsibility and display hydraulic press, communication is carried out by fieldbus, the work such as action control, data acquisition of PLC control system 17 primary responsibility hydraulic press between it and PLC control system 17.PLC control system 17 is by the displacement signal of AI module acquires from the pressure signal in the main hydraulic cylinder 10 of the first pressure sensor 13, second pressure sensor 14 and kicker cylinder 12 and the main hydraulic cylinder 10 from displacement transducer 15, PLC control system 17 controls the magnet switching of the first two-way valve 5, second two-way valve 7 and 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.
See 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 electromagnet that PLC control system 17 controls the first two-way valve 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 4, first two-way valve 5, drives main hydraulic cylinder 10 down to run; Hydraulic oil in kicker cylinder 12 flows back to the fuel tank of hydraulic press through the 3rd two-way valve 8, sutaining valve 9; PLC control system 17 controls by the openings of sizes controlling servo proportion 4 flow entering main hydraulic cylinder 10, thus controls the speed of service of main hydraulic cylinder 10.In addition, advanced section of Ultra-Low Speed work, a road hydraulic oil is also had to enter kicker cylinder 12 through hydraulic pump 1, check valve 3, adjustable liquid resistance 6 and the second two-way valve 7.Therefore, under Ultra-Low Speed work ingoing silver part, still a road continuous print hydraulic oil is had to flow back to the fuel tank of hydraulic press through the 3rd two-way valve 8, sutaining valve 9 in kicker cylinder 12, make sutaining valve 9 still can maintain certain opening under Ultra-Low Speed work ingoing silver part, avoid the wild effect opened when breaking when occurring because flow is too little, ensure hydraulic press Ultra-Low Speed traveling comfort.
As follows in the speeds control principle of advanced section of Ultra-Low Speed work see the electrohydraulic control system shown in Fig. 3, Fig. 2:
PLC control system 17 is by the displacement signal of AI module Real-time Collection from the main hydraulic cylinder 10 of displacement transducer 15, and correspondingly calculate the present speed signal of main hydraulic cylinder 10, table look-up according to the present bit shifting signal of main hydraulic cylinder 10 and displacement-rate curve of presetting and obtain current speed command, the present speed signal of gained speed command and 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, the flow of the hydraulic oil through servo proportion 4 is gone to drive main hydraulic cylinder 10 as total driving flow, hydraulic press is run according to the displacement preset-rate curve.
As follows at the press power control principle of advanced section of Ultra-Low Speed work see the electrohydraulic control system shown in Fig. 4, Fig. 2:
PLC control system 17 passes through AI module Real-time Collection respectively from the first pressure sensor 13, the displacement signal of the pressure signal in the main hydraulic cylinder 10 of the second pressure sensor 14 and kicker cylinder 12 and the main hydraulic cylinder 10 from displacement transducer 15, and correspondingly calculate the current press power of hydraulic press, table look-up according to the present bit shifting signal of main hydraulic cylinder 10 and displacement-press power curve of presetting and obtain 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, the flow of the hydraulic oil through servo proportion 4 is gone to drive main hydraulic cylinder 10 as total driving flow, make hydraulic press according to the displacement preset-press power curve motion.
Claims (9)
1. one kind realizes the electrohydraulic control system of hydraulic press Ultra-Low Speed stable operation, it is characterized in that: comprise 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), sutaining 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 of check valve (3) is communicated with, the T mouth of overflow valve (2) is communicated 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 of adjustable liquid resistance (6) is communicated with, the T mouth of three way flow control valve is communicated with described fuel tank, the A mouth of three way flow control valve is communicated with the P mouth of the first two-way valve (5), the A mouth of the first two-way valve (5) is communicated with main hydraulic cylinder (10), the B mouth of adjustable liquid resistance (6) is communicated with the P mouth of the second two-way valve (7), the A mouth of the second two-way valve (7) is communicated with kicker cylinder (12), kicker cylinder (12) is communicated with the A mouth of the 3rd two-way valve (8), the P mouth of the 3rd two-way valve (8) is communicated with the P mouth of sutaining valve (9), the T mouth of sutaining valve (9) is communicated with described fuel tank.
2. a kind of electrohydraulic control system realizing the stable operation of hydraulic press Ultra-Low Speed according to claim 1, it is characterized in that: also comprise the first pressure sensor (13), the second pressure sensor (14) and displacement transducer (15), described first pressure sensor (13) is communicated with main hydraulic cylinder (10), second pressure sensor (14) is communicated with kicker cylinder (12), and institute's displacement sensors (15) is installed on main hydraulic cylinder (10).
3. a kind of electrohydraulic control system realizing the stable operation of hydraulic press Ultra-Low Speed according to claim 1 and 2, it is characterized in that: also comprise control system, described control system can be used in: gather the pressure signal in main hydraulic cylinder (10) and kicker cylinder (12), gather the displacement signal of main hydraulic cylinder (10), control the magnet switching of the first two-way valve (5), the second two-way valve (7) and the 3rd two-way valve (8), and control the openings of sizes of three way flow control valve.
4. a kind of electrohydraulic control system realizing the stable operation of hydraulic press Ultra-Low Speed according to claim 3, is characterized in that: described control system is PLC control system (17).
5. a kind of electrohydraulic control system realizing the stable operation of hydraulic press Ultra-Low Speed according to claim 4, it is characterized in that: described PLC control system (17) comprises AI module, DO module and AO module, described AI module is electrically connected with the first pressure sensor (13), the second pressure sensor (14), displacement transducer (15) respectively, described DO module is electrically connected with the first two-way valve (5), the second two-way valve (7), the 3rd two-way valve (8) respectively, and described AO module is electrically connected with three way flow control valve.
6. a kind of electrohydraulic control system realizing the stable operation of hydraulic press Ultra-Low Speed according to any one of claim 3 to 5, is characterized in that: also comprise man-machine interface (16), and described man-machine interface (16) is connected by fieldbus with control system.
7. a kind of electrohydraulic control system realizing the stable operation of hydraulic press Ultra-Low Speed according to any one of claim 1 to 6, is characterized in that: described three way flow control valve is servo proportion (4), proportioning valve or servo valve.
8. a kind of electrohydraulic control system realizing the stable operation of hydraulic press Ultra-Low Speed according to any one of claim 1 to 7, is characterized in that: described adjustable liquid resistance (6) is manual throttle valve, manual governing valve, proportional throttle valve or proportional velocity regulating valve.
9. a kind of electrohydraulic control system realizing the stable operation of hydraulic press Ultra-Low Speed according to any one of claim 1 to 8, is characterized in that: described sutaining valve (9) is manual overflow valve or proportional pressure control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510330259.7A CN104999695B (en) | 2015-06-15 | 2015-06-15 | A kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510330259.7A CN104999695B (en) | 2015-06-15 | 2015-06-15 | A kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104999695A true CN104999695A (en) | 2015-10-28 |
| CN104999695B CN104999695B (en) | 2016-09-28 |
Family
ID=54372675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510330259.7A Active CN104999695B (en) | 2015-06-15 | 2015-06-15 | A kind of electrohydraulic control system realizing hydraulic press Ultra-Low Speed stable operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104999695B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106122186A (en) * | 2016-08-29 | 2016-11-16 | 南通锻压设备股份有限公司 | A kind of hydraulic system realizing the stepless accurate speed governing of hydraulic press |
| CN107524662A (en) * | 2017-10-12 | 2017-12-29 | 南通锻压设备股份有限公司 | A kind of hydraulic press energy regenerating and sliding block weight balancing system |
| CN108427290A (en) * | 2018-06-06 | 2018-08-21 | 南通锻压设备股份有限公司 | A kind of slider of hydraulic press 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 |
| CN112277375A (en) * | 2020-08-27 | 2021-01-29 | 天津市天锻压力机有限公司 | Process forming method of powder forming hydraulic press |
| CN117621533A (en) * | 2024-01-26 | 2024-03-01 | 南通锻压设备如皋有限公司 | Control method for quick descending of composite material hydraulic press sliding block |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004183899A (en) * | 2002-12-05 | 2004-07-02 | Liebherr-France Sas | Method and device for damping movement of hydraulic cylinder of mobile working machine |
| CN1683797A (en) * | 2005-03-15 | 2005-10-19 | 浙江大学 | Double pump-motor hydraulic driving system for lifting oil cylinder of engineering machine |
| CN101125352A (en) * | 2007-09-27 | 2008-02-20 | 天津市天锻压力机有限公司 | Ultramicro-speed closed loop controlling structure for hydraulic forming machine |
| CN201650941U (en) * | 2010-02-08 | 2010-11-24 | 上海汇益控制***股份有限公司 | Unidirectional and quick-retracting battery solution servo system |
| CN102303087A (en) * | 2011-09-20 | 2012-01-04 | 天津市天锻压力机有限公司 | Super dead-slow speed control method for slide block of hydraulic machine |
| CN103758800A (en) * | 2014-01-24 | 2014-04-30 | 北京交通大学 | Control system for multi-hydraulic-cylinder tunnel simulated experiment platform |
| CN204385805U (en) * | 2014-12-16 | 2015-06-10 | 山河智能装备股份有限公司 | A kind of hydraulic pump of excavator control loop |
-
2015
- 2015-06-15 CN CN201510330259.7A patent/CN104999695B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004183899A (en) * | 2002-12-05 | 2004-07-02 | Liebherr-France Sas | Method and device for damping movement of hydraulic cylinder of mobile working machine |
| CN1683797A (en) * | 2005-03-15 | 2005-10-19 | 浙江大学 | Double pump-motor hydraulic driving system for lifting oil cylinder of engineering machine |
| CN101125352A (en) * | 2007-09-27 | 2008-02-20 | 天津市天锻压力机有限公司 | Ultramicro-speed closed loop controlling structure for hydraulic forming machine |
| CN201650941U (en) * | 2010-02-08 | 2010-11-24 | 上海汇益控制***股份有限公司 | Unidirectional and quick-retracting battery solution servo system |
| CN102303087A (en) * | 2011-09-20 | 2012-01-04 | 天津市天锻压力机有限公司 | Super dead-slow speed control method for slide block of hydraulic machine |
| CN103758800A (en) * | 2014-01-24 | 2014-04-30 | 北京交通大学 | Control system for multi-hydraulic-cylinder tunnel simulated experiment platform |
| CN204385805U (en) * | 2014-12-16 | 2015-06-10 | 山河智能装备股份有限公司 | A kind of hydraulic pump of excavator control loop |
Non-Patent Citations (1)
| Title |
|---|
| 黄明辉等: "大型模锻液压机极低速运行泄露补偿", 《中国机械工程》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106122186A (en) * | 2016-08-29 | 2016-11-16 | 南通锻压设备股份有限公司 | A kind of hydraulic system realizing the stepless accurate speed governing of hydraulic press |
| CN107524662A (en) * | 2017-10-12 | 2017-12-29 | 南通锻压设备股份有限公司 | A kind of hydraulic press energy regenerating and sliding block weight balancing system |
| 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 |
| CN108427290A (en) * | 2018-06-06 | 2018-08-21 | 南通锻压设备股份有限公司 | A kind of slider of hydraulic press parallel motion control system and control method |
| 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 |
| CN112277375A (en) * | 2020-08-27 | 2021-01-29 | 天津市天锻压力机有限公司 | Process forming method of powder forming hydraulic press |
| CN117621533A (en) * | 2024-01-26 | 2024-03-01 | 南通锻压设备如皋有限公司 | Control method for quick descending of composite material hydraulic press sliding block |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104999695B (en) | 2016-09-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104999695A (en) | Electro-hydraulic control system capable of achieving ultralow-speed stable running of hydraulic machine | |
| CN100532864C (en) | Hydraulic control | |
| CN102588358B (en) | High-performance energy saving type electro-hydraulic servo control oil line | |
| CN104481958B (en) | A kind of confluence selection function pilot operated valve device and loading machine determine variable delivery hydraulic system | |
| CN202108817U (en) | Electro-hydraulic actuator controlled by flow regulating valve | |
| CN103122648A (en) | Multi-way valve hydraulic control system, rectilinear walking control valve and excavator | |
| CN103982475B (en) | A kind of concrete ejection car jib hydraulic control system | |
| CN101927401A (en) | Welder device and sliding table control method | |
| CN105041744A (en) | PLC control system and method of servo energy-saving control system of ceramic press | |
| CN105437396A (en) | Pump-control ram piston hydraulic pressure system of mixer | |
| CN105351293A (en) | Energy recovery system for passive volume synchronous system | |
| CN102758421A (en) | Synchronous split-type hydraulic hoist | |
| CN106812761B (en) | Crank block type feedback digital hydraulic cylinder | |
| CN103738396A (en) | Constant flow steering system and engineering machinery | |
| CN105570238A (en) | Valveless hydraulic servo synchronous system | |
| CN203879827U (en) | Servo drive hydraulic system | |
| CN206592380U (en) | Crank block type feedback digital hydraulic cylinder | |
| CN108286545A (en) | A kind of floating weight of banbury mixer oil cylinder hydraulic control system | |
| CN101210580A (en) | Star-wheel synchronization hydraulic system for tunneling machine | |
| CN206530575U (en) | A kind of hydraulic system for realizing the stepless accurate speed governing of hydraulic press | |
| CN202732515U (en) | Flow control hydraulic system and engineering machine | |
| CN102305223A (en) | Hydraulic control device and control method thereof | |
| CN205800265U (en) | A kind of hydraulic system of sewage solid waste hydraulic press | |
| CN102155446B (en) | Segmental control integration-type electro-hydraulic digital valve | |
| CN205396210U (en) | Automatic a steering system of tractor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |