CN116181709A - Novel closed pump control asymmetric cylinder system of electric engineering machinery - Google Patents
Novel closed pump control asymmetric cylinder system of electric engineering machinery Download PDFInfo
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 122
- 238000004146 energy storage Methods 0.000 claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 10
- 238000011084 recovery Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 3
- 238000010248 power generation Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 73
- 238000010276 construction Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single 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
- F15B21/14—Energy-recuperation means
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention provides a novel closed pump control asymmetric cylinder system which can recover energy of the system under a forward load working condition, and the energy is stored by a bidirectional hydraulic pump motor and a bidirectional variable-speed servo motor power generation and power supply energy storage unit, and the energy is used by the bidirectional variable-speed servo motor and the bidirectional hydraulic pump motor under a reverse load working condition by the power supply of the power storage unit. Meanwhile, the asymmetric hydraulic cylinder of the system is provided with a third hydraulic cavity which is directly connected with a small closed pump control system, energy recovery and utilization are carried out through independent control, and meanwhile, the small closed pump control system can be independently driven according to working conditions to actively control flow and pressure to assist in controlling an actuator of the asymmetric hydraulic cylinder, so that the service performance of the system is improved. According to the invention, the energy utilization efficiency of the electric engineering mechanical movable arm is improved, the energy wasted in the working process is recovered and utilized, and the loading capacity and the working performance of the movable arm are improved.
Description
Technical Field
The invention relates to the technical field of closed pump control systems, in particular to a novel closed pump control asymmetric cylinder system of an electric engineering machine.
Background
Along with the demands of national economy development and national construction, the role of engineering project construction in the national economy development plays a role, and the excavator is an indispensable engineering machine in the rapid development of society. The conventional engineering machinery widely adopts a driving system of an engine, a variable pump, a multi-way valve and an actuator, has the urgent problems of high energy consumption, high noise, low operation precision, serious oil pollution and the like, and simultaneously has the urgent problems of global energy shortage, continuous rising of requirements of various constructions on the excavator and the like, and has higher and higher requirements on the technical specification of the excavator, so that the development of the industrial technology of the excavator to the environment protection, the intelligence and the Internet of things is a constant trend. However, the existing multi-way valve control inevitably generates throttling loss and overflow loss, is insufficient in heavy load capacity and energy transmission efficiency, is easy to cause energy loss, and has large noise and low operation precision when in use, and also affects user experience.
Disclosure of Invention
The invention discloses a novel closed pump control asymmetric cylinder system of an electric engineering machine, which is simple in structure and convenient to operate, and aims to solve the problems of high energy consumption, high noise, low operation precision and serious oil pollution of the existing engineering machine.
The invention adopts the following scheme: the utility model provides a novel asymmetric jar system of closed pump accuse of electric engineering machinery, includes electric energy storage unit, oil tank, still includes: the system comprises a first bidirectional variable speed servo motor, a first bidirectional hydraulic pump motor, an asymmetric hydraulic cylinder, a second bidirectional hydraulic pump motor, a second bidirectional variable speed servo motor, a first motor driver, a second motor driver and a controller; wherein the asymmetric hydraulic cylinder is suitable for being connected with an external load of a system and comprises a first cavity, a second cavity and a third cavity;
the first bidirectional hydraulic pump motor comprises a first oil port and a second oil port, the first oil port is communicated with the first cavity of the asymmetric hydraulic cylinder to form a first cavity oil way, the second oil port is communicated with the second cavity of the asymmetric hydraulic cylinder to form a second cavity oil way, the third cavity of the asymmetric hydraulic cylinder is communicated with the second bidirectional hydraulic pump motor to form a third cavity oil way, the second bidirectional hydraulic pump motor is connected to the second bidirectional variable-rotation-speed servo motor, and the second bidirectional variable-rotation-speed servo motor is electrically connected to the second motor driver; the first bidirectional variable-rotation-speed servo motor is configured to control the actuation direction and the actuation speed of the asymmetric hydraulic cylinder by controlling the flow and the pressure of the first bidirectional hydraulic pump motor;
the electric energy storage unit is connected with the first bidirectional variable speed servo motor and the second bidirectional variable speed servo motor at the same time, and is configured to enable the first bidirectional variable speed servo motor, the second bidirectional variable speed servo motor, the first bidirectional hydraulic pump motor and the second bidirectional hydraulic pump motor to rotate under the action of external load so as to generate electricity for the electric energy storage unit to recover and store energy when external load of the system is in a forward load working condition; when the external load of the system is in a reverse load working condition, the electric energy storage unit can supply power to the controller and the motor driver to drive the first bidirectional variable speed servo motor and the second bidirectional variable speed servo motor to rotate; at this time, the controller and the second motor driver are configured to drive the second bidirectional variable rotation speed servo motor to drive the second bidirectional hydraulic pump motor to rotate according to the working condition of the external load of the system so as to give the third cavity pressure of the asymmetric cylinder, thereby realizing the heavy load output of the asymmetric hydraulic cylinder.
Further, the asymmetric hydraulic cylinder further comprises a magnetostrictive displacement sensor and an extension rod, wherein the extension rod is movably connected to the first cavity and the third cavity and is suitable for being connected with an electric engineering machine to bear external load of the system; the magnetostrictive displacement sensor is coupled to the controller and the extension rod and is configured to collect displacement data of the extension rod and transmit the data to the controller.
Further, a first one-way valve and a second one-way valve which are communicated to the oil tank are respectively arranged on the first cavity oil way and the second cavity oil way of the first two-way hydraulic pump motor in parallel, and a first overflow valve and a second overflow valve which are communicated to the oil tank are respectively arranged on the first one-way valve and the second one-way valve in parallel.
Further, a first two-position two-way solenoid valve is further arranged on the first two-way hydraulic pump motor in parallel, and the first two-position two-way solenoid valve is configured between a first cavity oil way and a second cavity oil way of the asymmetric hydraulic cylinder and is in a normally closed position.
Further, a second two-position two-way electromagnetic valve is arranged on the first cavity oil way and is in a normally open position, a third two-position two-way electromagnetic valve is arranged on the second cavity oil way and is in a normally open position, and a fourth two-position two-way electromagnetic valve is arranged on the third cavity oil way and is in a normally open position; the second two-position two-way electromagnetic valve, the third two-position two-way electromagnetic valve and the fourth two-position two-way electromagnetic valve are configured to be capable of switching on and off of the first cavity oil way, the second cavity oil way and the third cavity oil way through opening and closing actions respectively.
Further, a third overflow valve communicated to the oil tank is further arranged on the third cavity oil path in parallel, and the third overflow valve is configured to enable oil to flow into the oil tank from the third cavity when the pressure of the third cavity of the asymmetric hydraulic cylinder is overloaded.
Further, the controller is electrically connected to the first motor driver and the second motor driver, which are electrically connected to the first bi-directional variable speed servo motor and the second bi-directional variable speed servo motor, respectively, which are adapted to provide speed feedback and current feedback to the first motor driver and the second motor driver, respectively.
The beneficial effects are that:
1. the system uses an electric energy storage unit and a bidirectional variable-rotation-speed servo motor to drive and recover energy, so that the bidirectional variable-rotation-speed servo motor is connected with a bidirectional hydraulic pump motor to control flow and pressure, the controller and a motor driver control the forward and reverse rotation of the motor to control the extension and retraction of the actuator of the symmetrical hydraulic cylinder, and the controller and the motor driver control the forward and reverse rotation speed of the motor to control the extension and retraction speed of the actuator of the symmetrical hydraulic cylinder.
2. The asymmetric cylinder applied by the system is provided with a third cavity which is independently and directly connected with a small pump control system, and the asymmetric cylinder can be independently subjected to energy recycling and load force driving control according to working conditions. Energy exchange between the servo motor and the electric energy storage unit can be realized through identification of the forward load working condition and the reverse load working condition and independent control of the two servo motors, so that energy recovery and utilization are realized, and meanwhile, the load force output can be better matched with the working conditions. Different from the traditional closed pump control asymmetric cylinder system, the novel closed pump control asymmetric cylinder system solves the flow compensation problem existing in the traditional asymmetric cylinder closed pump control system by using the three-cavity hydraulic cylinder, and can actively control the pressure of the third cavity through the small closed pump control system, and the energy recovery and the actuation of the asymmetric cylinder are controlled in an auxiliary manner, so that the novel closed pump control asymmetric cylinder system has huge improvement in the aspects of energy utilization efficiency, actuation speed and output force.
Drawings
FIG. 1 is a schematic diagram of a novel closed pump controlled asymmetric cylinder system and control thereof in accordance with an embodiment of the present invention;
icon: the hydraulic control system comprises an electric energy storage unit 1, a first bidirectional variable rotation speed servo motor 2, a first bidirectional hydraulic pump motor 3, an oil tank 4, a first one-way valve 5, a second one-way valve 6, a first overflow valve 7, a second overflow valve 8, a first two-position two-way electromagnetic valve 9, a second two-position two-way electromagnetic valve 10, a third two-position two-way electromagnetic valve 11, a magnetostrictive displacement sensor 12, an asymmetric hydraulic cylinder 13, a fourth two-position two-way electromagnetic valve 14, a third overflow valve 15, a second bidirectional hydraulic pump motor 16, a second bidirectional variable rotation speed servo motor 17, a second motor driver 18, a first motor driver 19 and a controller 20.
Detailed Description
Examples
With reference to fig. 1, this embodiment provides a novel closed pump control asymmetric cylinder system of an electric engineering machine, including an electric energy storage unit 1 and an oil tank 4, and further including: a first bidirectional variable speed servo motor 2, a first bidirectional hydraulic pump motor 3, an asymmetric hydraulic cylinder 13, a second bidirectional hydraulic pump motor 16, a second bidirectional variable speed servo motor 17, a first motor driver 19, a second motor driver 18, and a controller 20; wherein the asymmetric hydraulic cylinder 13 is adapted to be connected to a system external load, and comprises a first chamber, a second chamber and a third chamber;
the first bidirectional hydraulic pump motor 3 comprises a first oil port and a second oil port, the first oil port is communicated with the first cavity of the asymmetric hydraulic cylinder 13 to form a first cavity oil path, the second oil port is communicated with the second cavity of the asymmetric hydraulic cylinder 13 to form a second cavity oil path, the third cavity of the asymmetric hydraulic cylinder 13 is communicated with the second bidirectional hydraulic pump motor 16 to form a third cavity oil path, the second bidirectional hydraulic pump motor 16 is connected to the second bidirectional variable rotation speed servo motor 17, and the second bidirectional variable rotation speed servo motor 17 is electrically and mechanically connected to the second motor driver 18; the first bidirectional variable rotation speed servo motor 2 is configured to control the actuation direction and actuation speed of the asymmetric hydraulic cylinder 13 by controlling the flow rate and pressure of the first bidirectional hydraulic pump motor 3;
the electric energy storage unit 1 is connected with the first bidirectional variable speed servo motor 2 and the second bidirectional variable speed servo motor 17 at the same time, and is configured such that when an external load of the system is in a forward load working condition, the first bidirectional variable speed servo motor 2, the second bidirectional variable speed servo motor 17, the first bidirectional hydraulic pump motor 3 and the second bidirectional hydraulic pump motor 16 can rotate under the action of the external load to generate electricity for the electric energy storage unit 1 so as to perform energy recovery and storage; when the external load of the system is in a reverse load working condition, the electric energy storage unit 1 can supply power to the controller 20 and the motor driver to drive the first bidirectional variable speed servo motor 2 and the second bidirectional variable speed servo motor 17 to rotate; at this time, the controller 20 and the second motor driver 18 are configured to drive the second bidirectional variable rotation speed servo motor 17 to drive the second bidirectional hydraulic pump motor 16 to rotate according to the working condition of the external load of the system, so as to apply the third cavity pressure of the asymmetric cylinder, thereby realizing the heavy load output of the asymmetric hydraulic cylinder 13.
In this embodiment, the electric engineering machine may be an excavator, a lifter, or the like, and for convenience of description, the present embodiment is described by taking the excavator as an example, but is not limited to the excavator.
In this embodiment, the asymmetric hydraulic cylinder 13 further includes a magnetostrictive displacement sensor 12 and an extension rod, where the extension rod is movably connected to the first cavity and the third cavity, and is adapted to be connected to an electric engineering machine to receive an external load of the system; the magnetostrictive displacement sensor 12 is coupled to the controller 20 and the extension rod and is configured to collect displacement data of the extension rod and transmit the data to the controller 20. The extending rod is used for bearing a load and has the following working principle:
when the extending rod of the asymmetric hydraulic cylinder 13 extends upwards and the loaded force is upwards, the first bidirectional variable rotation speed servo motor 2 is in a forward load working condition (for example, the movable arm of the excavator and the ground contact support machine body slowly fall), the first cavity of the asymmetric hydraulic cylinder 13 is a high-pressure cavity, the second cavity is a low-pressure cavity, the extending rod of the asymmetric hydraulic cylinder 13 extends upwards, oil flows from the first cavity to the second cavity through the first bidirectional hydraulic pump motor 3 under the action of external load of the system, and meanwhile the first bidirectional variable rotation speed servo motor 2 is driven to rotate forward to generate electricity to the electric energy storage unit 1, so that electric energy recovery is completed. The second bidirectional variable-rotation-speed servo motor 17 is also in a forward load working condition at the moment, oil flows through the second bidirectional hydraulic pump motor 16 from the oil tank 4 under the action of external load of the system and enters the third cavity of the asymmetric hydraulic cylinder 13, and drives the second bidirectional hydraulic pump motor 16 and the second variable-rotation-speed servo motor to rotate forward to generate electricity and store energy, so that the energy storage unit 1 is used for recovering and storing energy.
When the extension rod of the asymmetric hydraulic cylinder 13 is retracted downwards and the loaded force is applied upwards, the first bidirectional variable rotation speed servo motor 2 is in a reverse load working condition (for example, the excavator movable arm is slowly lifted up from the ground contact supporting machine body or the excavator movable arm is contacted with the ground and excavated downwards), at this time, the first cavity of the asymmetric hydraulic cylinder 13 is a high-pressure cavity, the second cavity is a low-pressure cavity, and the electric energy storage unit 1 supplies power to drive the first bidirectional variable rotation speed servo motor 2 and the first bidirectional hydraulic pump motor 3 under the control of the controller 20 and the first motor driver 19, so that oil flows from the second cavity to the first cavity through the first bidirectional hydraulic pump motor 3 to push the extension rod of the asymmetric hydraulic cylinder 13 to retract downwards. The second bidirectional variable speed servo motor 17 is also in a reverse load working condition at the moment, the electric energy storage unit 1 supplies power to drive the second bidirectional variable speed servo motor 17 and the second bidirectional hydraulic pump motor 16 to rotate reversely under the control of the controller 20 and the second motor driver 18, oil flows through the second bidirectional hydraulic pump motor 16 into the oil tank 4 from the third cavity of the asymmetric hydraulic cylinder 13 under the action of the second bidirectional hydraulic pump motor 16, and the extension rod of the auxiliary asymmetric hydraulic cylinder 13 is retracted downwards;
when the extension rod of the asymmetric hydraulic cylinder 13 is retracted downwards and the loaded force is applied downwards, the first bidirectional variable-rotation-speed servo motor 2 is in a forward load working condition (for example, the movable arm of the excavator is lowered from high to low in an idle or loaded state), at this time, the first cavity of the asymmetric hydraulic cylinder 13 is a low-pressure cavity, the second cavity is a high-pressure cavity, the extension rod of the asymmetric hydraulic cylinder 13 is retracted downwards, oil flows from the second cavity to the first cavity through the first bidirectional hydraulic pump motor 3 under the action of the external load of the system, and meanwhile, the first bidirectional hydraulic pump motor 3 and the first bidirectional variable-rotation-speed servo motor 2 are driven to rotate reversely to generate electricity to the electricity energy storage unit 1 to complete recovery of electric energy. The second bidirectional variable-rotation-speed servo motor 17 is also in a forward load working condition at the moment, oil flows through the second bidirectional hydraulic pump motor 16 from the third cavity of the asymmetric hydraulic cylinder 13 under the action of the external load of the system and enters the oil tank 4, so that the second bidirectional hydraulic pump motor 16 and the second variable-rotation-speed servo motor are driven to reversely rotate to generate electricity and the electricity storage unit 1 to complete energy recovery and storage;
when the extension rod of the asymmetric hydraulic cylinder 13 extends upwards and the loaded force is downward, the first bidirectional variable rotation speed servo motor 2 is in a reverse load working condition (for example, the movable arm of the excavator is lifted from low to high in an idle state or a loaded state), the first cavity of the asymmetric hydraulic cylinder 13 is a low-pressure cavity, the second cavity is a high-pressure cavity, and the electric energy storage unit 1 supplies power to drive the first bidirectional variable rotation speed servo motor 2 and the first bidirectional hydraulic pump motor 3 under the control of the controller 20 and the first motor driver 19 to rotate forward so that oil flows from the first cavity to the second cavity through the first bidirectional hydraulic pump motor 3 to push the extension rod of the asymmetric hydraulic cylinder 13 to extend upwards. At this time, the second bidirectional variable speed servo motor 17 is also in a reverse load condition, the electric energy storage unit 1 supplies power to drive the second bidirectional variable speed servo motor 17 and the second bidirectional hydraulic pump motor 16 to rotate forward under the control of the controller 20 and the second motor driver 18, and oil flows into the third cavity of the asymmetric hydraulic cylinder 13 from the oil tank 4 through the second bidirectional hydraulic pump motor 16 under the action of the second bidirectional hydraulic pump motor 16, so as to assist the extension rod of the asymmetric hydraulic cylinder 13 to extend upwards.
In the embodiment of the invention, a small closed pump control system is provided, and the small closed pump control system comprises a fourth two-position two-way electromagnetic valve 14, a third overflow valve 15, a second bidirectional hydraulic pump motor 16, a second bidirectional variable rotation speed servo motor 17 and a second motor driver 18. The third relief valve 15 is disposed in parallel on the third chamber oil path and is connected to the oil tank 4, and the third relief valve 15 is configured to allow oil to flow into the oil tank 4 from the third chamber when the third chamber of the asymmetric hydraulic cylinder 13 is pressure-overloaded. The third cavity of the asymmetric hydraulic cylinder 13 is independently and directly connected with a small closed pump control system, when the pressure of the third cavity of the asymmetric hydraulic cylinder 13 is overloaded, the third overflow valve 15 works to enable oil to flow into the oil tank 4 from the third cavity of the asymmetric hydraulic cylinder 13, and according to the forward and reverse load working conditions, the controller 20 and the second motor driver 18 can jointly control the rotation speed, the rotation direction, the power generation and the like of the second bidirectional variable rotation speed servo motor 17 and the second bidirectional hydraulic pump motor 16.
In this embodiment, a first check valve 5 and a second check valve 6 connected to the oil tank 4 are respectively disposed in parallel on a first chamber oil path and a second chamber oil path of the first bidirectional hydraulic pump motor 3, and a first overflow valve 7 and a second overflow valve 8 connected to the oil tank 4 are respectively disposed in parallel on the first check valve 5 and the second check valve 6. When the movable arm of the excavator extends (retracts) to the maximum position or the load is excessive, so that the internal pressure of the novel closed pump control asymmetric cylinder system is too high, oil flows into the oil tank 4 through the first overflow valve 7 and the second overflow valve 8, so that overload protection of the system is realized, and the system and components are prevented from being damaged; meanwhile, when the internal flow of the novel closed pump control asymmetric cylinder system is insufficient, hydraulic oil in the oil tank 4 can flow into the system through the first one-way valve 5 and the second one-way valve 6 so as to supplement oil to the first cavity or the second cavity of the asymmetric hydraulic cylinder 13.
The first bidirectional hydraulic pump motor 3 is also provided with a first two-position two-way electromagnetic valve 9 in parallel, and the first two-position two-way electromagnetic valve 9 is configured between a first cavity oil way and a second cavity oil way of the asymmetric hydraulic cylinder 13 and is in a normally closed position. When the excavator is used up or the novel closed pump control asymmetric cylinder system is damaged and cannot work normally, the first two-position two-way electromagnetic valve 9 can be actively controlled to unload the asymmetric hydraulic cylinder 13, so that the extension rod of the asymmetric hydraulic cylinder 13 returns to the initial position, and the pressure balance of the first cavity and the second cavity of the asymmetric hydraulic cylinder 13 is controlled to prevent the system from being damaged.
In a preferred embodiment, the first cavity oil path is provided with a second two-position two-way electromagnetic valve 10 and is in a normally open position, the second cavity oil path is provided with a third two-position two-way electromagnetic valve 11 and is in a normally open position, and the third cavity oil path is provided with a fourth two-position two-way electromagnetic valve 14 and is in a normally open position; the second two-position two-way electromagnetic valve 10, the third two-position two-way electromagnetic valve 11 and the fourth two-position two-way electromagnetic valve 14 are configured to be capable of switching on and off of the first cavity oil passage, the second cavity oil passage and the third cavity oil passage through opening and closing actions respectively. When the power is off, the asymmetric hydraulic cylinder 13 is communicated with the first cavity oil way, the second cavity oil way and the small closed pump control system, so that the novel closed pump control asymmetric cylinder system can work normally. When the movable arm of the excavator is hovered at a certain position due to working conditions, the system is powered to enable the second two-position two-way electromagnetic valve 10, the third two-position two-way electromagnetic valve 11 and the fourth two-position two-way electromagnetic valve 14 to be simultaneously switched to the closed positions, so that the first cavity oil way, the second cavity oil way and the small pump control system are cut off, and the asymmetric hydraulic cylinder 13 is in a pressure maintaining state.
The controller 20 is electrically connected to the first motor driver 19 and the second motor driver 18, the first motor driver 19 and the second motor driver 18 are electrically connected to the first bi-directional variable speed servo motor 2 and the second bi-directional variable speed servo motor 17, respectively, and the first bi-directional variable speed servo motor 2 and the second bi-directional variable speed servo motor 17 are adapted to provide speed feedback and current feedback to the first motor driver 19 and the second motor driver 18, respectively.
The novel closed pump control asymmetric cylinder system mainly controls the actuating direction and actuating speed of the asymmetric hydraulic cylinder 13 by controlling the steering and rotating speeds of the first bidirectional variable rotating speed servo motor 2 and the second bidirectional variable rotating speed servo motor 17. The control system of the novel closed pump control asymmetric cylinder system comprises a controller 20, a first motor driver 19 and a second motor driver 18, wherein a target signal is input to the controller 20, the controller 20 automatically analyzes and processes data to the first motor driver 19 and the second motor driver 18 so as to control the steering and the rotating speeds of a first bidirectional variable-speed motor and a second bidirectional variable-rotating-speed motor, and meanwhile, displacement and speed signal feedback data are collected according to a magnetostrictive displacement sensor 12 arranged on an asymmetric hydraulic cylinder 13 to finish negative feedback control to the controller 20. The controller 20 can independently control the first bidirectional variable speed servo motor 2 and the second bidirectional variable speed servo motor 17 according to the working condition and the working mode of the excavator to achieve the optimal working performance.
The novel closed pump control asymmetric cylinder system provided by the embodiment of the invention can recover the energy of the system under the forward load working condition, the bidirectional hydraulic pump motor and the bidirectional variable speed servo motor generate electricity to store the energy of the power supply energy storage unit 1, and the power supply energy storage unit 1 supplies power to the bidirectional variable speed servo motor and the bidirectional hydraulic pump motor under the reverse load working condition to utilize the energy. Meanwhile, the asymmetric hydraulic cylinder 13 of the system is provided with a third hydraulic cavity which is directly connected with a small closed pump control system, energy recovery and utilization are carried out through independent control, and meanwhile, the small closed pump control system can be independently driven according to working conditions to actively control flow and pressure to assist in controlling an actuator of the asymmetric hydraulic cylinder 13, so that the service performance of the system is improved. According to the invention, the energy utilization efficiency of the electric engineering mechanical movable arm is improved, the energy wasted in the working process is recovered and utilized, and the loading capacity and the working performance of the movable arm are improved.
It should be understood that: the above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention.
The description of the drawings in the embodiments above illustrates only certain embodiments of the invention and should not be taken as limiting the scope, since other related drawings may be made by those of ordinary skill in the art without the benefit of the inventive faculty.
Claims (7)
1. The utility model provides a novel asymmetric jar system of closed pump accuse of electric engineering machinery, includes electric energy storage unit, oil tank, its characterized in that still includes: the system comprises a first bidirectional variable speed servo motor, a first bidirectional hydraulic pump motor, an asymmetric hydraulic cylinder, a second bidirectional hydraulic pump motor, a second bidirectional variable speed servo motor, a first motor driver, a second motor driver and a controller; wherein,,
the asymmetric hydraulic cylinder is suitable for being connected with an external load of a system and comprises a first cavity, a second cavity and a third cavity;
the first bidirectional hydraulic pump motor comprises a first oil port and a second oil port, the first oil port is communicated with the first cavity of the asymmetric hydraulic cylinder to form a first cavity oil way, the second oil port is communicated with the second cavity of the asymmetric hydraulic cylinder to form a second cavity oil way, the third cavity of the asymmetric hydraulic cylinder is communicated with the second bidirectional hydraulic pump motor to form a third cavity oil way, the second bidirectional hydraulic pump motor is connected to the second bidirectional variable-rotation-speed servo motor, and the second bidirectional variable-rotation-speed servo motor is electrically connected to the second motor driver;
the first bidirectional variable-rotation-speed servo motor is configured to control the actuation direction and the actuation speed of the asymmetric hydraulic cylinder by controlling the flow and the pressure of the first bidirectional hydraulic pump motor;
the electric energy storage unit is connected with the first bidirectional variable speed servo motor and the second bidirectional variable speed servo motor at the same time, and is configured to enable the first bidirectional variable speed servo motor, the second bidirectional variable speed servo motor, the first bidirectional hydraulic pump motor and the second bidirectional hydraulic pump motor to rotate under the action of external load so as to generate electricity for the electric energy storage unit to recover and store energy when external load of the system is in a forward load working condition; when the external load of the system is in a reverse load working condition, the electric energy storage unit can supply power to the controller, the first motor driver and the second motor driver to drive the first bidirectional variable-speed servo motor and the second bidirectional variable-speed servo motor to rotate; at this time, the controller and the second motor driver are configured to drive the second bidirectional variable rotation speed servo motor to drive the second bidirectional hydraulic pump motor to rotate according to the working condition of the external load of the system so as to give the third cavity pressure of the asymmetric cylinder, thereby realizing the heavy load output of the asymmetric hydraulic cylinder.
2. The novel closed pump controlled asymmetric cylinder system of an electric engineering machine of claim 1, wherein the asymmetric hydraulic cylinder further comprises a magnetostrictive displacement sensor and an extension rod, the extension rod is movably connected to the first cavity and the third cavity and is suitable for being connected with the electric engineering machine to bear external load of the system; the magnetostrictive displacement sensor is coupled to the controller and the extension rod and is configured to collect displacement data of the extension rod and transmit the data to the controller.
3. The novel closed pump-controlled asymmetric cylinder system of an electric engineering machine according to claim 1, wherein a first check valve and a second check valve which are communicated to the oil tank are respectively arranged on a first cavity oil path and a second cavity oil path of the first bidirectional hydraulic pump motor in parallel, and a first overflow valve and a second overflow valve which are communicated to the oil tank are respectively arranged on the first check valve and the second check valve in parallel.
4. The novel closed pump-controlled asymmetric cylinder system of an electric engineering machine as claimed in claim 3, wherein the first bi-directional hydraulic pump motor is further provided with a first two-position two-way solenoid valve in parallel, and the first two-position two-way solenoid valve is configured between a first cavity oil path and a second cavity oil path of the asymmetric hydraulic cylinder and is in a normally closed position.
5. The novel closed pump control asymmetric cylinder system of the electric engineering machinery according to claim 1, wherein a second two-position two-way electromagnetic valve is arranged on the first cavity oil path and is in a normally open position, a third two-position two-way electromagnetic valve is arranged on the second cavity oil path and is in a normally open position, and a fourth two-position two-way electromagnetic valve is arranged on the third cavity oil path and is in a normally open position; the second two-position two-way electromagnetic valve, the third two-position two-way electromagnetic valve and the fourth two-position two-way electromagnetic valve are configured to be capable of switching on and off of the first cavity oil way, the second cavity oil way and the third cavity oil way through opening and closing actions respectively.
6. The novel closed pump-controlled asymmetric cylinder system of an electric engineering machine of claim 1, wherein a third relief valve is further disposed in parallel on the third chamber oil path and is configured to allow oil to flow from the third chamber into the oil tank when the third chamber of the asymmetric hydraulic cylinder is pressure-overloaded.
7. The novel closed pump controlled asymmetric cylinder system of an electric work machine of claim 1, wherein the controller is electrically connected to the first and second motor drivers, the first and second motor drivers being electrically connected to the first and second bi-directional variable speed servomotors, respectively, the first and second bi-directional variable speed servomotors being adapted to provide speed feedback and current feedback to the first and second motor drivers, respectively.
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| CN202310075024.2A CN116181709A (en) | 2023-01-16 | 2023-01-16 | Novel closed pump control asymmetric cylinder system of electric engineering machinery |
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| CN202310075024.2A CN116181709A (en) | 2023-01-16 | 2023-01-16 | Novel closed pump control asymmetric cylinder system of electric engineering machinery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116556465A (en) * | 2023-06-30 | 2023-08-08 | 华侨大学 | Electric hydrostatic actuator system for electric excavator and engineering machinery |
| CN116989037A (en) * | 2023-08-07 | 2023-11-03 | 重庆大学 | Pump control system and control method for energy recovery |
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2023
- 2023-01-16 CN CN202310075024.2A patent/CN116181709A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116556465A (en) * | 2023-06-30 | 2023-08-08 | 华侨大学 | Electric hydrostatic actuator system for electric excavator and engineering machinery |
| CN116989037A (en) * | 2023-08-07 | 2023-11-03 | 重庆大学 | Pump control system and control method for energy recovery |
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