CN204591851U - Multistage flow pressure compound control system - Google Patents
Multistage flow pressure compound control system Download PDFInfo
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- CN204591851U CN204591851U CN201520273722.4U CN201520273722U CN204591851U CN 204591851 U CN204591851 U CN 204591851U CN 201520273722 U CN201520273722 U CN 201520273722U CN 204591851 U CN204591851 U CN 204591851U
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- reversing valve
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Abstract
The utility model discloses a kind of multistage flow pressure compound control system, belong to field of hydraulic control.Master controller, servo driver, hydraulic pressure feeding mechanism, pressure transducer, flowmeter, relief valve, proportional reversing valve, hydraulic actuator and the displacement transducer be arranged on hydraulic actuator; Hydraulic pressure feeding mechanism connection traffic meter, flowmeter connects proportional reversing valve, proportional reversing valve connecting fluid pressure actuator; The oil outlet setting pressure sensor of hydraulic pressure feeding mechanism, pressure transducer electrical connection servo driver; Hydraulic pressure feeding mechanism electrical connection servo driver; Servo driver, flowmeter, proportional reversing valve and displacement transducer are electrically connected with master controller.Directly gather oil circuit changes in flow rate signal by installing flowmeter on oil circuit, accurately and reliably, its structure is simple, and node is few, easy to maintenance for signal; Between pressure flow steadily, the receptance of system to actuator and load parameter change is low, and system responses performance is improved significantly.
Description
Technical field
The utility model relates to a kind of compound control system, is specifically a kind of multistage flow pressure compound control system, belongs to field of hydraulic control.
Background technique
Along with flow pressure feedback, electricity feedback, the proposition of the principles such as pressure direct-detection and application, the properties and application of proportional throttle valve is gradually improved, but its problems existed in actual using process, the flow transducer that pressure difference compensation device or two-way plug-in valve and displacement detecting unit form of must connecting again outside proportional throttle valve when existing method uses could control flow, reduce dynamic performance and the through-current capability of valve, and easily produce wild effect.In addition, limit by working principle, even if promote pressure transducer also uncontrollable pressure on proportional throttle valve, and ratio pressure and flow must be constructed respectively by different structures.This just causes must using two cover electro-hydraulic proportional valves in the electrohydraulic control system needing complex controll pressure and flow at injection machine, die casting machine etc., make control system more complicated, add malfunctioning node, have impact on the stable operation of equipment, add maintenance difficulties and cost simultaneously.
Model utility content
Technical problem to be solved in the utility model is to overcome prior art defect, provides a kind of structure simple, good stability, is easy to the multistage flow pressure compound control system safeguarded.
In order to solve the problems of the technologies described above, the multistage flow pressure compound control system that the utility model provides, the displacement transducer comprising master controller, servo driver, hydraulic pressure feeding mechanism, pressure transducer, flowmeter, relief valve, proportional reversing valve, hydraulic actuator and be arranged on hydraulic actuator; Described hydraulic pressure feeding mechanism connection traffic meter, flowmeter connects proportional reversing valve, proportional reversing valve connecting fluid pressure actuator; The oil outlet setting pressure sensor of described hydraulic pressure feeding mechanism, pressure transducer electrical connection servo driver; Described hydraulic pressure feeding mechanism electrical connection servo driver; Described servo driver, flowmeter, proportional reversing valve and displacement transducer are electrically connected with master controller.
In the utility model, connection traffic valve between described hydraulic pressure feeding mechanism and flowmeter.
In the utility model, the metering pump that described hydraulic pressure feeding mechanism comprises actuating motor and is connected with actuating motor.
In the utility model, described hydraulic actuator is oil cylinder, and institute's displacement sensors is electronic ruler.
The beneficial effects of the utility model are: (1), directly gather oil circuit changes in flow rate signal by installing flowmeter on oil circuit, signal accurately and reliably, build-up pressure under system low discharge, the speed input percentage of given 1%-100% realizes the proportional continuously adjustabe of oil cylinder speed, its structure is simple, node is few, easy to maintenance; (2), regulated by rational integration and dead band, realize pressure flow steadily to switch, the receptance of system to actuator and load parameter change reduces, and system responses performance is improved, and it meets injection machine and the high dynamic responding speed of die casting machine and control accuracy.
Accompanying drawing explanation
Fig. 1 is the utility model multistage flow pressure compound control system structural representation;
Fig. 2 is the utility model control system composition schematic diagram.
Embodiment
below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, the utility model multistage flow pressure compound control system, comprises master controller, servo driver, actuating motor, metering pump, pressure transducer, flowmeter, relief valve, proportional reversing valve, oil cylinder and electronic ruler.Servocontroller electrical connection actuating motor, controls driven by servomotor metering pump and runs.The filler opening of metering pump connects fuel tank (not shown), metering pump oil outlet setting pressure sensor, metering pump oil outlet connection traffic meter, and flowmeter connects proportional reversing valve, and proportional reversing valve is connected with oil cylinder.Proportional reversing valve connects relief valve, and for fictitious load change, relief valve connects fuel tank.Quantitatively pump connection traffic valve between flowmeter, for pumping hole by-pass throttle.Electronic ruler is arranged on oil cylinder, for detecting the real time position of oil cylinder, and forming position closed loop.Above-mentioned pressure transducer is electrically connected with servo driver, for feeding back metering pump oil outlet pressure to servo driver; Servo driver, flowmeter, proportional reversing valve, displacement transducer are electrically connected with master controller.
Course of normal operation of the present utility model is: master controller obtains the position information of oil cylinder according to electronic ruler, exports corresponding flow, pressure signal to servo driver according to setting; Pressure transducer by the metering pump oil outlet pressure Real-time Feedback that records to servo driver.Servo driver controls rotating speed and the torque of actuating motor according to rate signal, the pressure signal of pressure, flow instruction signal and encoder, pressure transducer feedback, and with control system pressure and flow indirectly, driven by servomotor metering pump runs; Simultaneously, master controller is directly to SC sigmal control solenoid-operated proportional selector valve, control stretching out and retracting of oil cylinder, flowmeter converts thereof into voltage signal according to uninterrupted in oil circuit and returns to master controller, and master controller adjusts according to the rotating speed of the uninterrupted of setting by servo driver adjustment actuating motor.
Constant pressure limit-discharge control process is:
Constant pressure limit-discharge control is pressure controlled while, and the speed command exported by the Stress control ring of flow instruction restriction servo driver is to reach flow control.For improving system rapidity and stability, the flow when Stress control needed for system can regulate, and adopts the control mode according to pressure difference handoff parameter.When error is larger, adopt larger parameter, make system be in restraint-type flow control; When error is less, adopts less parameter, make system be in Stress control.Because the integrator effect in servo driver, when system pressure does not reach command pressure, certain flow is kept to export; And when system reaches command pressure, if overshoot exceeds less error, larger parameter makes integrator weaken rapidly, get back to pressure balance.At the frequent handoff parameter of single-point, dead band can not be added between strong parameter and the pressure error value of weak parameter switching institute foundation for avoiding system.When pressure instruction drops to zero, become PI and control, into P controls, to accelerate pressure drop speed.In the present embodiment, when carrying out constant pressure limit-discharge control, such as now master controller is to servo driver 5MP pressure signal, and system pressure needs to maintain 5MP, and now given flow is certain, given 40L; If now relief valve leaves too much, system overflow can be caused too much, the pressure of whole system is certain to decline, if it is constant to need to maintain pressure 5MP, only has and increase flow system flow input, the given servo driver rate signal of master controller increases, improve the rotating speed of metering pump, strengthen fuel delivery.In raising Rotation Process, if the lacking of system pressure drop, now master controller speed preset signal adopts less parameter, if Pressure Drop is many, master controller speed preset signal adopts larger parameter.In control procedure, in order to avoid pressure overshoot, PPI control mode should be entered as soon as possible, make in adjustment process, have integrator to weaken overshoot rapidly.
Pressure flow switching controls process is:
When adopting flow control when pressure difference is greater than a certain value, pressure controlled calculating need be carried out simultaneously, make the integrator of Stress control ring reach limit value.Like this when flow control switches to Stress control, the integral element initial value of Stress control ring is limit value, and the impact that when can alleviate switching, transition brings too soon, enables flow system flow reach requirement of actual working condition.In the present embodiment, when adopting flow control when system pressure difference is less than a certain value, servo driver, according to metering pump oil outlet pressure transducer feedback pressure value, carries out calculation of pressure, in conjunction with the integrator of Stress control ring in servo driver, make pressure can not produce too much overshoot, when switching to Stress control from flow control in system, due to the effect of pressure ring integration, when system carries out Stress control, can not produce fluctuation, oil cylinder can run stably according to actual conditions.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art, can also make some improvement under the prerequisite not departing from the utility model principle, these improvement also should be considered as protection domain of the present utility model.
Claims (4)
1. a multistage flow pressure compound control system, is characterized in that: the displacement transducer comprising master controller, servo driver, hydraulic pressure feeding mechanism, pressure transducer, flowmeter, relief valve, proportional reversing valve, hydraulic actuator and be arranged on hydraulic actuator; Described hydraulic pressure feeding mechanism connection traffic meter, flowmeter connects proportional reversing valve, proportional reversing valve connecting fluid pressure actuator; The oil outlet setting pressure sensor of described hydraulic pressure feeding mechanism, pressure transducer electrical connection servo driver; Described hydraulic pressure feeding mechanism electrical connection servo driver; Described servo driver, flowmeter, proportional reversing valve and displacement transducer are electrically connected with master controller.
2. multistage flow pressure compound control system according to claim 1, is characterized in that: connection traffic valve between described hydraulic pressure feeding mechanism and flowmeter.
3. multistage flow pressure compound control system according to claim 1 and 2, is characterized in that: the metering pump that described hydraulic pressure feeding mechanism comprises actuating motor and is connected with actuating motor.
4. multistage flow pressure compound control system according to claim 3, it is characterized in that: described hydraulic actuator is oil cylinder, institute's displacement sensors is electronic ruler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520273722.4U CN204591851U (en) | 2015-04-30 | 2015-04-30 | Multistage flow pressure compound control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520273722.4U CN204591851U (en) | 2015-04-30 | 2015-04-30 | Multistage flow pressure compound control system |
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| CN204591851U true CN204591851U (en) | 2015-08-26 |
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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 |
| CN106931006A (en) * | 2015-12-29 | 2017-07-07 | 哈尔滨恒誉名翔科技有限公司 | A kind of new steering gear hydraulic system |
| CN108661958A (en) * | 2018-06-27 | 2018-10-16 | 苏州力森克液压设备有限公司 | A kind of flux monitoring-type hydraulic cylinder |
| CN110147039A (en) * | 2019-05-17 | 2019-08-20 | 固高科技(深圳)有限公司 | Hydrauservo System and its control device |
| CN113417898A (en) * | 2021-06-28 | 2021-09-21 | 北京航空航天大学 | Electro-hydraulic actuator system based on electromagnetic proportional valve and displacement control method thereof |
| CN114109963A (en) * | 2021-11-19 | 2022-03-01 | 济南悉通液压设备配套有限公司 | Operation control method for oil cylinder of corner combining machine and hydraulic system |
-
2015
- 2015-04-30 CN CN201520273722.4U patent/CN204591851U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106931006A (en) * | 2015-12-29 | 2017-07-07 | 哈尔滨恒誉名翔科技有限公司 | A kind of new steering gear hydraulic system |
| 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 |
| CN108661958A (en) * | 2018-06-27 | 2018-10-16 | 苏州力森克液压设备有限公司 | A kind of flux monitoring-type hydraulic cylinder |
| CN110147039A (en) * | 2019-05-17 | 2019-08-20 | 固高科技(深圳)有限公司 | Hydrauservo System and its control device |
| CN113417898A (en) * | 2021-06-28 | 2021-09-21 | 北京航空航天大学 | Electro-hydraulic actuator system based on electromagnetic proportional valve and displacement control method thereof |
| CN113417898B (en) * | 2021-06-28 | 2022-07-12 | 北京航空航天大学 | Electro-hydraulic actuator system based on electromagnetic proportional valve and displacement control method thereof |
| CN114109963A (en) * | 2021-11-19 | 2022-03-01 | 济南悉通液压设备配套有限公司 | Operation control method for oil cylinder of corner combining machine and hydraulic system |
| CN114109963B (en) * | 2021-11-19 | 2023-12-15 | 济南悉通液压设备配套有限公司 | Corner-assembled engine oil cylinder operation control method and hydraulic system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: NANJING ESTUN AUTOMATION CO., LTD. Free format text: FORMER OWNER: AIERFA ELECTROHYDRAULIC TECHNOLOGY CO., LTD., NANJING CITY Effective date: 20150908 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150908 Address after: 211100 Jiangning Economic Development Zone, Jiangsu Province, general Avenue, No. 155, No. Patentee after: Nanjing Estun Automation Co., Ltd. Address before: Shengtai Industrial Park No. 88 SIEMENS road 211100 Jiangsu city of Nanjing province Jiangning economic and Technological Development Zone Patentee before: Aierfa Electrohydraulic Technology Co., Ltd., Nanjing City |