CN107882786B - Static and dynamic flow real-time matching system of closed pump control single-rod hydraulic cylinder - Google Patents
Static and dynamic flow real-time matching system of closed pump control single-rod hydraulic cylinder Download PDFInfo
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- CN107882786B CN107882786B CN201710982037.2A CN201710982037A CN107882786B CN 107882786 B CN107882786 B CN 107882786B CN 201710982037 A CN201710982037 A CN 201710982037A CN 107882786 B CN107882786 B CN 107882786B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
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Abstract
A static and dynamic flow real-time matching system of a closed pump-controlled single-rod hydraulic cylinder belongs to an electro-hydraulic control system, a servo motor is coaxially connected with a variable-displacement asymmetric gear pump, a first working oil port of the variable-displacement asymmetric gear pump is connected with a rodless cavity of the single-rod hydraulic cylinder, a second working oil port of the variable-displacement asymmetric gear pump is connected with a rod cavity of the single-rod hydraulic cylinder, and a third working oil port of the variable-displacement asymmetric gear pump is connected with an energy accumulator; the energy accumulator is communicated with the oil inlets of the first check valve and the second check valve and the oil outlets of the first overload valve and the second overload valve, the oil outlet of the first check valve is communicated with the rodless cavity of the single-rod hydraulic cylinder, the oil outlet of the second check valve is communicated with the rod cavity of the single-rod hydraulic cylinder, the oil inlet of the first overload valve is communicated with the rodless cavity of the single-rod hydraulic cylinder, and the oil inlet of the second overload valve is communicated with the rod cavity of the single-rod hydraulic cylinder. The invention can compensate the asymmetric flow generated by the area difference of the differential cylinder and realize the dynamic flow matching between the single-rod hydraulic cylinder and the asymmetric gear pump.
Description
Technical Field
The invention relates to a control loop of a closed pump-controlled single-rod hydraulic cylinder, belonging to an electro-hydraulic control system.
Background
The electro-hydraulic control technology comprises two major types of valve control and pump control. At present, valve control is widely applied, but large throttling loss exists, energy efficiency is low, system heating is caused, if a cooling device is additionally arranged, the installed power and cost of the system are further increased, and faults can be caused due to heating. The valve control systems are all open loops, the usage amount of oil is large, and pollution is generated when waste oil is treated.
The non-valve pump direct control technology is adopted, two cavities of the hydraulic cylinder need to be pre-compressed like a valve control principle, and the problem of well-balanced differential cylinder asymmetric flow is solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a dynamic real-time matching system for asymmetric flow of a single-rod hydraulic cylinder, which has a simple structure and is convenient to set.
Therefore, the invention provides a closed pump-controlled single-rod hydraulic cylinder static and dynamic flow real-time matching loop which is used for realizing dynamic real-time matching of asymmetric flow of a single-rod hydraulic cylinder.
The invention is realized by adopting the following technical scheme.
A closed pump control single-outlet-rod hydraulic cylinder static and dynamic flow real-time matching loop comprises a servo motor, an energy accumulator, an overflow valve, a one-way valve and a single-rod hydraulic cylinder; the servo motor is coaxially connected with the variable gear pump and the quantitative gear pump, a first oil port A of the asymmetric gear pump is connected with a rodless cavity of the single-rod hydraulic cylinder, a second oil port B is connected with a rod cavity of the single-rod hydraulic cylinder, and a third oil port C is connected with the energy accumulator; the energy accumulator is communicated with the rodless cavity and the rod cavity of the hydraulic cylinder through the one-way valve; oil inlets of the two overflow valves are respectively communicated with a rodless cavity and a rod cavity of the hydraulic cylinder, and oil outlets of the two overflow valves are connected with an energy accumulator.
The variable-displacement asymmetric gear pump is characterized in that a variable-displacement asymmetric gear pump is additionally arranged, the asymmetric gear pump consists of a quantitative gear pump and a variable gear pump, and the variable gear pump can be matched with any cross-sectional area ratio of a rod cavity and a rodless cavity of a single-rod hydraulic cylinder through the variation of the displacement of the variable gear pump. The asymmetric gear pump is provided with three flow distribution windows which are respectively a first oil port, a second oil port and a third oil port.
The specific control method of the invention is as follows:
the controller collects position signals of the single-rod hydraulic cylinder, and outputs adjusting signals to control the rotating speed of the servo motor and the discharge capacity of the pump after processing; when the servo motor rotates clockwise, the asymmetric gear pump discharges oil through the first oil port, the second oil port sucks oil, the third oil port sucks oil from the energy accumulator to compensate the flow difference of the two cavities of the hydraulic cylinder, and the piston rod of the hydraulic cylinder is controlled to extend out; when the servo motor rotates anticlockwise, the asymmetric gear pump absorbs oil through the first oil port, the second oil port discharges the oil, redundant oil is discharged into the energy accumulator through the third oil port, and the piston rod of the hydraulic cylinder is retracted.
Compared with the prior art, the invention has the following advantages and positive effects.
The invention can compensate the asymmetric flow generated by the area difference of the differential cylinder, realizes the dynamic flow matching between the single-rod hydraulic cylinder and the asymmetric gear pump, obtains the symmetric extending and retracting speed, simplifies the control structure and ensures that the system obtains good dynamic characteristics.
The area of the single-rod hydraulic cylinder is fixed at present, and the quantitative gear pump and the variable gear pump are combined. One asymmetric pump can realize the functions of two independent pumps, and the application range of the pump is further expanded. The static flow can be controlled, the dynamic flow pulsation can be controlled, and the leakage loss is reduced.
Because the asymmetric gear pump has the four-quadrant working characteristic, under the action of different loads, the asymmetric gear pump can have pump working conditions, motor working conditions and pump-motor composite working conditions, more frequent internal energy conversion exists, and the automatic conversion and the efficient utilization of the kinetic potential energy of the system are realized by solving the energy transfer path and action rule of the system.
Drawings
FIG. 1 is a schematic diagram of the system structure of the asymmetric pump-controlled single-rod hydraulic cylinder of the present invention.
Fig. 2 is a three-dimensional exploded view of an asymmetrical gear pump.
Fig. 3 is a schematic cross-sectional view of a three port window of an asymmetrical gear pump.
In the figure, 1, a servo motor, 2, an energy accumulator, 3, an asymmetric gear pump, 4, an overflow valve, 5, a check valve, 6, a single-rod hydraulic cylinder, 7, a controller, 8, a front end cover, 9, a shaft bushing, 10a, a gear A, 10B, a gear B, 11, a driving shaft, 12, a driven shaft, 13, a shell, 14 and a rear end cover. A: a first oil port of the asymmetric gear pump; b: a second oil port of the asymmetric gear pump; c: and a third oil port of the asymmetric gear pump.
Detailed Description
The following further describes the embodiments of the present invention.
As shown in the attached figure 1, the closed pump control single-rod hydraulic cylinder static and dynamic flow real-time matching loop provided by the invention comprises a servo motor 1, an energy accumulator 2, an asymmetric gear pump 3, an overflow valve 4, a one-way valve 5, a single-rod hydraulic cylinder 6 and a controller 7.
The controller collects position signals of the single-rod hydraulic cylinder, and outputs adjusting signals to control the rotating speed of the servo motor and the discharge capacity of the pump after processing; the servo motor is coaxially connected with the variable gear pump and the quantitative gear pump, a first oil port of the asymmetric gear pump is connected with a rodless cavity of the single-rod hydraulic cylinder, a second oil port of the asymmetric gear pump is connected with a rod cavity of the single-rod hydraulic cylinder, and a third oil port of the asymmetric gear pump is connected with the energy accumulator; the energy accumulator is communicated with the rodless cavity and the rod cavity of the hydraulic cylinder through the one-way valve; oil inlets of the two overflow valves are respectively communicated with a rodless cavity and a rod cavity of the hydraulic cylinder, and oil outlets of the two overflow valves are connected with an energy accumulator.
As shown in fig. 2, the asymmetric gear pump includes a front end cover 8, a gear a10a, a bushing 9, a driving shaft 11, a driven shaft 12, a housing 13, a gear B10B, and a rear end cover 14; one end of the driving shaft and one end of the driven shaft are provided with a bushing, a gear A, a bushing and a front end cover, and the other end of the driving shaft and the other end of the driven shaft are provided with a bushing, a gear B, a bushing and a rear end cover.
As shown in the attached figure 3, the asymmetric gear pump consists of a quantitative gear pump and a variable gear pump, and can be matched with any cross-sectional area ratio of a rod cavity and a rodless cavity of the single-rod hydraulic cylinder through the change of the displacement of the variable gear. The asymmetric gear pump is provided with three flow distribution windows which are a first oil port A, a second oil port B and a third oil port C respectively.
The motor used for driving the driving shaft of the asymmetric gear pump is a servo motor.
The invention relates to a closed pump control single-rod hydraulic cylinder static and dynamic flow real-time matching loop, which is implemented specifically, and the control method comprises the following steps: the controller collects position signals of the single-rod hydraulic cylinder, and outputs adjusting signals to control the rotating speed of the servo motor and the discharge capacity of the pump after processing; when the servo motor rotates clockwise, the asymmetric gear pump discharges oil through the first oil port, the second oil port sucks oil, the third oil port sucks oil from the energy accumulator to compensate the flow difference of the two cavities of the hydraulic cylinder, and the piston rod of the hydraulic cylinder is controlled to extend out; when the servo motor rotates anticlockwise, the asymmetric gear pump absorbs oil through the first oil port, the second oil port discharges the oil, redundant oil is discharged into the energy accumulator through the third oil port, and the piston rod of the hydraulic cylinder is retracted.
The servo motor 1 is coaxially connected with the variable-displacement asymmetric gear pump 3, a first working oil port A of the asymmetric gear pump 3 is connected with a rodless cavity of the single-rod hydraulic cylinder 6, a second working oil port B is connected with a rod cavity of the single-rod hydraulic cylinder 6, and a third working oil port C is connected with the energy accumulator 2; the energy accumulator is communicated with an oil inlet of the one-way valve 5 and an oil outlet of the overflow valve 4 through hydraulic pipelines. An oil outlet of the one-way valve 5 is respectively communicated with a rodless cavity and a rod cavity of the single-rod hydraulic cylinder 6; an oil inlet of the overflow valve 4 is communicated with a rodless cavity and a rod cavity of the single-rod hydraulic cylinder 6.
The working principle of the above-described embodiment is as follows.
The controller collects position signals and the like of the single-rod hydraulic cylinder 6, and outputs adjusting signals to control the rotating speed of the servo motor 1 and the displacement of the asymmetric gear pump 3 after processing; when the alternating current servo motor 1 rotates clockwise, the asymmetric gear pump 3 discharges oil through the first oil port A, the second oil port B sucks oil, and the third oil port C sucks oil from the energy accumulator 2 to compensate the flow difference of two cavities of the single-rod hydraulic cylinder 6 and control the piston rod of the hydraulic cylinder 6 to extend out; when the alternating current servo motor 1 rotates anticlockwise, the asymmetric gear pump 6 absorbs oil through the first oil port A, the second oil port B discharges the oil, redundant oil is discharged into the energy accumulator 2 through the third oil port C, and the piston rod of the single-rod hydraulic cylinder 6 is retracted.
Claims (1)
1. The closed pump control single-rod hydraulic cylinder static and dynamic flow real-time matching system comprises a servo motor, an energy accumulator, a first overload valve, a second overload valve, a first one-way valve, a second one-way valve and a single-rod hydraulic cylinder, and is characterized in that the servo motor is coaxially connected with a variable-displacement asymmetric gear pump, and the asymmetric gear pump comprises a front end cover, a gear A, a bushing, a driving shaft, a driven shaft, a shell, a gear B and a rear end cover; one end of the driving shaft and one end of the driven shaft are sequentially provided with a bushing, a gear A, a bushing and a front end cover, and the other end of the driving shaft and the other end of the driven shaft are sequentially provided with a bushing, a gear B, a bushing and a rear end cover; the variable-displacement asymmetric gear pump consists of a quantitative gear pump and a variable gear pump, and the variable gear pump is matched with any cross-sectional area ratio of a rod cavity and a rodless cavity of the single-rod hydraulic cylinder through the displacement change of the variable gear; the asymmetric gear pump is provided with three working oil ports, namely a first working oil port, a second working oil port and a third working oil port;
a first working oil port of the variable-displacement asymmetric gear pump is connected with a rodless cavity of the single-rod hydraulic cylinder, a second working oil port of the variable-displacement asymmetric gear pump is connected with a rod cavity of the single-rod hydraulic cylinder, and a third working oil port of the variable-displacement asymmetric gear pump is connected with an energy accumulator; the energy accumulator is communicated with oil inlets of the first one-way valve and the second one-way valve, oil outlets of the first overload valve and the second overload valve, an oil outlet of the first one-way valve is communicated with a rodless cavity of the single-rod hydraulic cylinder, an oil outlet of the second one-way valve is communicated with a rod cavity of the single-rod hydraulic cylinder, an oil inlet of the first overload valve is communicated with the rodless cavity of the single-rod hydraulic cylinder, and an oil inlet of the second overload valve is communicated with the rod cavity of the single-rod hydraulic cylinder;
the controller collects position signals of the single-rod hydraulic cylinder, and outputs adjusting signals to control the rotating speed of the servo motor and the discharge capacity of the pump after processing; when the servo motor rotates clockwise, the asymmetric gear pump discharges oil through the first working oil port, the second working oil port sucks oil, the third working oil port sucks oil from the energy accumulator to compensate the flow difference of the two cavities of the hydraulic cylinder, and the piston rod of the hydraulic cylinder is controlled to extend out; when the servo motor rotates anticlockwise, the asymmetric gear pump absorbs oil through the first working oil port, the second working oil port discharges the oil, redundant oil is discharged into the energy accumulator through the third working oil port, and the piston rod of the hydraulic cylinder is retracted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710982037.2A CN107882786B (en) | 2017-10-20 | 2017-10-20 | Static and dynamic flow real-time matching system of closed pump control single-rod hydraulic cylinder |
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| CN201710982037.2A CN107882786B (en) | 2017-10-20 | 2017-10-20 | Static and dynamic flow real-time matching system of closed pump control single-rod hydraulic cylinder |
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| CN107882786A CN107882786A (en) | 2018-04-06 |
| CN107882786B true CN107882786B (en) | 2020-01-07 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019229183A1 (en) * | 2018-06-01 | 2019-12-05 | HAWE Altenstadt Holding GmbH | Fairground ride passenger unit |
| CN109114076A (en) * | 2018-10-17 | 2019-01-01 | 太原理工大学 | A kind of single rod cylinder system of pump control |
| CN111237292B (en) * | 2020-01-12 | 2022-07-12 | 福建工程学院 | Speed closed-loop control method of variable-rotation-speed single-pump cylinder control closed system under four-quadrant working condition |
| CN111852982A (en) * | 2020-07-13 | 2020-10-30 | 南京理工大学 | Integrated radiating pump-controlled hydraulic cylinder |
| CN112727821B (en) * | 2021-01-05 | 2023-10-27 | 中冶南方连铸技术工程有限责任公司 | Single-rod electrohydraulic direct-drive servo cylinder device |
| CN113251013B (en) * | 2021-06-07 | 2022-08-12 | 中冶赛迪技术研究中心有限公司 | Electro-hydraulic direct-drive servo closed differential control driving system of stepping lifting mechanism |
| CN116851696A (en) * | 2023-05-30 | 2023-10-10 | 济南二机床集团有限公司 | Injection system based on die casting machine |
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| CN2408267Y (en) * | 2000-03-06 | 2000-11-29 | 胡惊雷 | Variable hydraulic gear pump |
| CN100424361C (en) * | 2006-03-07 | 2008-10-08 | 太原理工大学 | Closed electrohydraulic controlling system |
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