CN114517797A - Hydraulic system with energy recovery and reuse functions - Google Patents

Hydraulic system with energy recovery and reuse functions Download PDF

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Publication number
CN114517797A
CN114517797A CN202210165784.8A CN202210165784A CN114517797A CN 114517797 A CN114517797 A CN 114517797A CN 202210165784 A CN202210165784 A CN 202210165784A CN 114517797 A CN114517797 A CN 114517797A
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China
Prior art keywords
port
electromagnetic directional
valve
directional valve
oil
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Pending
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CN202210165784.8A
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Chinese (zh)
Inventor
扈凯
张文毅
祁兵
纪要
胡敏娟
刘宏俊
李坤
王云霞
严伟
夏倩倩
丁友强
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Nanjing Research Institute for Agricultural Mechanization Ministry of Agriculture
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Nanjing Research Institute for Agricultural Mechanization Ministry of Agriculture
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Priority to CN202210165784.8A priority Critical patent/CN114517797A/en
Publication of CN114517797A publication Critical patent/CN114517797A/en
Pending legal-status Critical Current

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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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • 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
    • 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
    • F15B13/027—Check valves
    • 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
    • F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
    • 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
    • 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
    • F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
    • F15B2013/0448—Actuation by solenoid and permanent magnet
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20523—Internal combustion engine
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6333—Electronic controllers using input signals representing a state of the pressure source, e.g. swash plate angle
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Abstract

A prime motor and a variable motor are respectively connected with a constant delivery pump I through a torque coupler; the first constant delivery pump supplies oil to the first electromagnetic directional valve and the fourth electromagnetic directional valve simultaneously; a branch where a second electromagnetic reversing valve is located and a branch where a first quantitative motor and a first one-way valve are located are connected in series between a rodless cavity of the first hydraulic cylinder and the first electromagnetic reversing valve; a branch where the electromagnetic directional valve V is located and a branch where the quantitative motor II and the one-way valve III are located are connected in series between the rodless cavity of the hydraulic cylinder II and the electromagnetic directional valve IV; the first and second quantitative motors are respectively and coaxially connected with the second and third quantitative pumps, and the second and third quantitative pumps are respectively connected with the first and second energy accumulators through the second and fourth one-way valves; the first energy accumulator and the second energy accumulator are respectively connected with an oil inlet of the one-way valve with the spring through a third electromagnetic reversing valve and a sixth electromagnetic reversing valve, and an oil outlet of the one-way valve with the spring is connected with the variable displacement motor. The system can effectively recover the gravitational potential energy released when the load descends or falls back, and can realize the reutilization of energy.

Description

Hydraulic system with energy recovery and reuse functions
Technical Field
The invention belongs to the technical field of hydraulic transmission, and particularly relates to a hydraulic system with energy recovery and reuse functions.
Background
During the working process of a hydraulic system with a hydraulic cylinder, a large amount of energy loss conditions exist; particularly, in the existing machinery which utilizes a hydraulic cylinder to overcome load work, a large amount of gravitational potential energy is released when the load descends or falls back, most of the energy is consumed at a throttling opening of the hydraulic valve and can be converted into heat energy of hydraulic oil, so that the heating problem of a hydraulic system is serious, the energy is wasted, meanwhile, the hydraulic system cannot work normally due to continuous rise of the oil temperature of the hydraulic system, and the service life of a hydraulic element is also shortened. In order to maintain the normal operation of the hydraulic system, the hydraulic oil needs to be forcibly cooled, and the cooling process needs to consume new energy, thereby causing multiple wastes of energy. In addition, if the hydraulic system does not have the energy recovery and recycling functions, the installed power of the hydraulic system is large, the installed power directly influences the energy consumption of the system, and the direct result is that the equipment is large in operation energy consumption and high in operation cost.
In the prior art, although some hydraulic systems can simultaneously realize the processes of energy recovery and recycling, the systems are generally complex in structure, high in implementation difficulty and low in recovery efficiency, and in addition, certain interference can be generated to the original systems in the recovery process.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a hydraulic system with energy recovery and reuse functions, which has the advantages of simple structure, strong universality and practicability, high recovery efficiency, capability of effectively recovering gravitational potential energy released when a load descends or falls back, and capability of storing the gravitational potential energy in an energy accumulator so as to realize energy reuse when needed; meanwhile, the recycling process and the reusing process of the system cannot interfere with the original system, and the system can be suitable for various engineering machines with hydraulic cylinders.
In order to achieve the purpose, the invention provides a hydraulic system with energy recovery and reuse functions, which comprises a prime motor, a variable motor, a constant delivery pump I, a hydraulic oil tank, a hydraulic cylinder I, a hydraulic cylinder II, a torque coupler, a rotating speed sensor, a displacement sensor I, a pressure sensor II and a microcontroller, wherein the constant delivery pump I is connected with the constant delivery pump I; the prime motor is connected with the input shaft I of the torque coupler through the coupling I; the variable motor is connected with a second input shaft of the torque coupler through a second coupler, and an output shaft of the torque coupler is connected with a first constant delivery pump through a third coupler and is used for coupling the input rotating speeds of the prime mover and the variable motor and then outputting the coupled input rotating speeds to drive the first constant delivery pump to rotate; an oil suction port of the first constant delivery pump is connected with a hydraulic oil tank, an oil discharge port of the first constant delivery pump is respectively connected with a port P of the first electromagnetic directional valve and a port P of the fourth electromagnetic directional valve, and a port T of the first electromagnetic directional valve and a port T of the fourth electromagnetic directional valve are both connected with the hydraulic oil tank;
A rod cavity of the first hydraulic cylinder is connected with a port A of a first electromagnetic directional valve, a rodless cavity of the first hydraulic cylinder is respectively connected with a port A of a second electromagnetic directional valve and a port A of a first quantitative motor through a first controllable throttle valve, a port B of the first quantitative motor is connected with an oil inlet of a first check valve, and the port B of the second electromagnetic directional valve and an oil outlet of the first check valve are both connected with a port B of the first electromagnetic directional valve; the first quantitative motor is coaxially connected with the second quantitative pump, and an A port and a B port of the second quantitative pump are respectively connected with an oil inlet of the second one-way valve and the hydraulic oil tank; an oil outlet of the one-way valve II is connected with an A port of the energy accumulator I and an A port of the electromagnetic reversing valve III respectively;
a rod cavity of the second hydraulic cylinder is connected with a port A of a fourth electromagnetic directional valve, a rodless cavity of the second hydraulic cylinder is respectively connected with a port A of a fifth electromagnetic directional valve and a port A of a second quantitative motor through a second controllable throttle valve, a port B of the second quantitative motor is connected with an oil inlet of a third one-way valve, and the port B of the fifth electromagnetic directional valve and an oil outlet of the third one-way valve are both connected with a port B of the fourth electromagnetic directional valve; the second quantitative motor is coaxially connected with the third quantitative pump, and an opening A and an opening B of the third quantitative pump are respectively connected with an oil inlet of the fourth one-way valve and the hydraulic oil tank; an oil outlet of the check valve IV is respectively connected with an A port of the energy accumulator II and an A port of the electromagnetic directional valve VI;
The port B of the third electromagnetic reversing valve and the port B of the sixth electromagnetic reversing valve are communicated with each other and then connected with an oil inlet of a check valve with a spring through a flow sensor, an oil outlet of the check valve with the spring is connected with a port A of a variable motor, and a port B of the variable motor is connected with a hydraulic oil tank;
the rotating speed sensor is connected with a transmission shaft of the variable motor and is used for acquiring a rotating speed signal of the variable motor in real time;
the displacement sensor is connected to a piston rod of the first hydraulic cylinder and used for acquiring a displacement signal I of the piston rod of the first hydraulic cylinder in real time;
the second displacement sensor is connected to a piston rod of the second hydraulic cylinder and used for acquiring a second displacement signal of the piston rod of the second hydraulic cylinder in real time;
the first pressure sensor is connected with the first energy accumulator and used for acquiring a first pressure signal of the first energy accumulator in real time;
the second pressure sensor is connected with the second energy accumulator and used for acquiring a second pressure signal of the second energy accumulator in real time;
the input end of the microcontroller is respectively connected with the rotating speed sensor, the first displacement sensor, the second displacement sensor, the first pressure sensor and the second pressure sensor, and the output end of the microcontroller is respectively connected with the prime mover, the variable motor, the first electromagnetic reversing valve, the second electromagnetic reversing valve, the third electromagnetic reversing valve, the fourth electromagnetic reversing valve, the fifth electromagnetic reversing valve and the sixth electromagnetic reversing valve.
The oil outlet of the first constant delivery pump is connected with the hydraulic oil tank through the overflow valve. Through the setting of filter, can filter a hydraulic pressure fluid that gets into constant delivery pump to can avoid constant delivery pump to receive the pollution and influence the life-span. The safety pressure of the system can be conveniently set through the arrangement of the overflow valve, so that the oil liquid discharged by the first constant delivery pump can directly flow back to the hydraulic oil tank when the system pressure exceeds the set pressure of the overflow valve, and the safe and stable operation of the system is ensured.
Furthermore, in order to enable the oil passages where the first energy accumulator and the second energy accumulator are located to maintain set safe pressure, the hydraulic control system further comprises a first proportional overflow valve and a second proportional overflow valve, and the first energy accumulator is connected with the hydraulic oil tank through the first proportional overflow valve; and the two accumulator channels are connected with the hydraulic oil tank through a second proportional overflow valve.
Preferably, the microcontroller is a PLC controller.
Preferably, the first electromagnetic directional valve and the fourth electromagnetic directional valve are three-position four-way electromagnetic directional valves with M-type middle position functions, the left electromagnet works in the left position when being electrified, the oil way between the port A and the port P is communicated, the oil way between the port B and the port T is communicated, the left electromagnet works in the middle position when being electrified, the port P is communicated with the port T and then communicated with a hydraulic oil tank, the port A and the port B are both cut off, the right electromagnet works in the right position when being electrified, the oil way between the port A and the port T is communicated, and the oil way between the port B and the port P is communicated.
Preferably, the second electromagnetic directional valve, the third electromagnetic directional valve, the fifth electromagnetic directional valve and the sixth electromagnetic directional valve are two-position two-way electromagnetic directional valves, the two-position two-way electromagnetic directional valves work on the left when being powered, oil paths between the ports A and B are communicated, the two-position two-way electromagnetic directional valves work on the right when being powered off, and the oil paths between the ports A and B are disconnected.
Preferably, the prime mover is an engine or an electric motor.
According to the invention, the first fixed displacement motor is coaxially connected with the second fixed displacement pump, the port B of the second fixed displacement pump is connected with the hydraulic oil tank, and the port A of the second fixed displacement pump is connected with the first energy accumulator through the second one-way valve, so that the second fixed displacement pump can be synchronously driven to rotate at a high speed in the process of high-speed rotation of the first fixed displacement motor, and high-pressure oil in the hydraulic oil tank can be supplied to the first energy accumulator; a branch where a second electromagnetic reversing valve is located, a branch where a first quantitative motor and a one-way valve are located are connected in series between a rodless cavity of a first hydraulic cylinder and a port B of the first electromagnetic reversing valve, whether high-pressure oil flowing out of the rodless cavity drives the first quantitative motor to act or not can be selected according to needs, and therefore a large amount of gravitational potential energy can be released for recycling when a load on the first hydraulic cylinder descends or falls back, and the gravitational potential energy can be stored in a first energy accumulator in the form of pressure energy of the high-pressure oil; the first energy accumulator is connected with the port A of the variable motor through the third electromagnetic directional valve and the one-way valve with the spring, and the port B of the variable motor is connected with the hydraulic oil tank, so that when the stored energy in the first energy accumulator reaches a usable degree, the pressure energy stored in the first energy accumulator can be conveniently used for driving the variable motor to rotate at a high speed. The second fixed displacement motor is coaxially connected with the third fixed displacement pump, the port B of the third fixed displacement pump is connected with the hydraulic oil tank, and the port A of the third fixed displacement pump is connected with the second energy accumulator through the check valve IV, so that the third fixed displacement pump can be synchronously driven to rotate at a high speed in the high-speed rotation process of the second fixed displacement motor, and high-pressure oil in the hydraulic oil tank can be supplied to the second energy accumulator; a branch where the electromagnetic directional valve five is located, a branch where the quantitative motor two and the one-way valve three are located are connected in series between the rodless cavity of the hydraulic cylinder two and the port B of the electromagnetic directional valve four at the same time, and whether high-pressure oil flowing out of the rodless cavity drives the quantitative motor two to act or not can be selected according to needs, so that a large amount of gravitational potential energy can be released for recycling when the load on the hydraulic cylinder two is lowered or falls back, and the gravitational potential energy can be stored in the energy accumulator two in the form of pressure energy of the high-pressure oil; the energy accumulator is connected with the port A of the variable motor through the electromagnetic reversing valve six and the one-way valve with the spring, and the port B of the variable motor is connected with the hydraulic oil tank, so that when the stored energy in the energy accumulator II reaches a usable degree, the pressure energy stored in the energy accumulator II can be conveniently used for driving the variable motor to rotate at a high speed. The system can recover and recycle energy in the hydraulic system with the first hydraulic cylinder and the second hydraulic cylinder independently acting, and also can recover and recycle energy in the hydraulic system with the first hydraulic cylinder and the second hydraulic cylinder synchronously acting.
Drawings
Fig. 1 is a hydraulic schematic of the present invention.
In the figure: 1. a prime mover, 2, a torque coupler, 3, a fixed displacement pump I, 4, a filter, 5, a hydraulic oil tank, 6, an overflow valve, 7, a variable displacement motor, 8, a rotation speed sensor, 9, a reed-equipped check valve, 10, a flow sensor, 11, a first electromagnetic directional valve, 12, a first hydraulic cylinder, 13, a first displacement sensor, 14, a second electromagnetic directional valve, 15, a first check valve, 16, a fixed displacement motor, 17, a second fixed displacement pump, 18, a second check valve, 19, a third electromagnetic directional valve, 20, a first proportional overflow valve, 21, a first pressure sensor, 22, a first energy accumulator, 23, a fourth electromagnetic directional valve, 24, a second hydraulic cylinder, 25, a second displacement sensor, 26, a fifth electromagnetic directional valve, 27, a third check valve, 28, a second fixed displacement motor, 29, a third fixed displacement pump, 30, a fourth check valve, 31, a sixth electromagnetic directional valve, 32, a second proportional overflow valve, 33, a second pressure sensor, 34. the energy accumulator II, the microcontroller, the energy accumulator 36, the controllable throttle valve I, the controllable throttle valve 37 and the controllable throttle valve II.
Detailed Description
The present invention will be further described with reference to the following examples.
As shown in fig. 1, the present invention provides a hydraulic system with energy recovery and reuse functions, which includes a prime mover 1, a variable displacement motor 7, a constant displacement pump one 3, a hydraulic oil tank 5, a hydraulic cylinder one 12, a hydraulic cylinder two 24, a torque coupler 2, a rotation speed sensor 8, a displacement sensor one 13, a pressure sensor one 21, a pressure sensor two 33 and a microcontroller 35; the prime motor 1 is connected with the input shaft I of the torque coupler 2 through a coupling I; the variable motor 7 is connected with the second input shaft of the torque coupler 2 through the second coupler, and the output shaft of the torque coupler 2 is connected with the first constant delivery pump 3 through the third coupler and used for coupling the input rotating speeds of the prime mover 1 and the variable motor 7 and then outputting the coupled input rotating speeds to drive the first constant delivery pump 3 to rotate; an oil suction port of the fixed displacement pump I3 is connected with the hydraulic oil tank 5, an oil discharge port of the fixed displacement pump I is respectively connected with a port P of the electromagnetic directional valve I11 and a port P of the electromagnetic directional valve IV 23, and a port T of the electromagnetic directional valve I11 and a port T of the electromagnetic directional valve IV 23 are both connected with the hydraulic oil tank 5;
A rod cavity of the hydraulic cylinder I12 is connected with an A port of the electromagnetic directional valve I11, a rodless cavity of the hydraulic cylinder I is respectively connected with an A port of the electromagnetic directional valve II 14 and an A port of the quantitative motor I16 through a controllable throttle valve I36, a B port of the quantitative motor I16 is connected with an oil inlet of the check valve I15, and the B port of the electromagnetic directional valve II 14 and an oil outlet of the check valve I15 are both connected with a B port of the electromagnetic directional valve I11; the first metering motor 16 is coaxially connected with the second metering pump 17, and an A port and a B port of the second metering pump 17 are respectively connected with an oil inlet of a second check valve 18 and the hydraulic oil tank 5; an oil outlet of the second check valve 18 is respectively connected with a first energy accumulator 22 and an A port of the third electromagnetic reversing valve 19;
a rod cavity of the hydraulic cylinder II 24 is connected with a port A of the electromagnetic directional valve IV 23, a rodless cavity of the hydraulic cylinder II is respectively connected with a port A of the electromagnetic directional valve V26 and a port A of the quantitative motor II 28 through a controllable throttle valve II 37, a port B of the quantitative motor II 28 is connected with an oil inlet of the one-way valve III 27, and a port B of the electromagnetic directional valve V26 and an oil outlet of the one-way valve III 27 are both connected with a port B of the electromagnetic directional valve IV 23; the second fixed displacement motor 28 is coaxially connected with a third fixed displacement pump 29, and an opening A and an opening B of the third fixed displacement pump 29 are respectively connected with an oil inlet of a fourth one-way valve 30 and the hydraulic oil tank 5; an oil outlet of the check valve IV 30 is respectively connected with the accumulator II 34 and an A port of the electromagnetic directional valve VI 31;
The port B of the electromagnetic directional valve III 19 and the port B of the electromagnetic directional valve VI 31 are communicated with each other and then are connected with an oil inlet of a spring-provided one-way valve 9 through a flow sensor 10, an oil outlet of the spring-provided one-way valve 9 is connected with the port A of a variable motor 7, and the port B of the variable motor 7 is connected with a hydraulic oil tank 5;
the rotating speed sensor 8 is connected with a transmission shaft of the variable motor 7 and is used for acquiring a rotating speed signal of the variable motor 7 in real time;
the first displacement sensor 13 is connected to a piston rod of the first hydraulic cylinder 12 and used for acquiring a first displacement signal of the piston rod of the first hydraulic cylinder 12 in real time;
the second displacement sensor 25 is connected to a piston rod of the second hydraulic cylinder 24 and is used for acquiring a second displacement signal of the piston rod of the second hydraulic cylinder 24 in real time;
the pressure sensor I21 is connected with the energy accumulator I22 and is used for acquiring a pressure signal I of the energy accumulator I22 in real time;
the second pressure sensor 33 is connected with the second energy accumulator 34 and is used for acquiring a second pressure signal of the second energy accumulator 34 in real time;
the input end of the microcontroller 35 is respectively connected with the rotating speed sensor 8, the first displacement sensor 13, the second displacement sensor 25, the first pressure sensor 21 and the second pressure sensor 33, and the output end of the microcontroller 35 is respectively connected with the prime mover 1, the variable motor 7, the first electromagnetic directional valve 11, the second electromagnetic directional valve 14, the third electromagnetic directional valve 19, the fourth electromagnetic directional valve 23, the fifth electromagnetic directional valve 26 and the sixth electromagnetic directional valve 31.
The constant delivery pump further comprises a filter 4 and an overflow valve 6, an oil suction port of the constant delivery pump I3 is connected with the hydraulic oil tank 5 through the filter 4, and an oil discharge port of the constant delivery pump I is connected with the hydraulic oil tank 5 through the overflow valve 6. Through the setting of filter, can filter a hydraulic pressure fluid that gets into constant delivery pump to can avoid constant delivery pump to receive the pollution and influence the life-span. The overflow valve is arranged, so that the safe pressure of the system can be conveniently set, and the oil discharged by the first constant delivery pump can directly flow back to the hydraulic oil tank when the pressure of the system exceeds the set pressure of the overflow valve, thereby ensuring the safe and stable operation of the system.
In order to maintain the set safety pressure of the oil circuit where the first accumulator and the second accumulator are located, the hydraulic system further comprises a first proportional overflow valve 20 and a second proportional overflow valve 32, and the first accumulator 22 is connected with the hydraulic oil tank 5 through the first proportional overflow valve 20; the second accumulator 34 is connected with the hydraulic oil tank 5 through the second proportional overflow valve 32.
Preferably, the microcontroller 35 is a PLC controller.
Preferably, the first electromagnetic directional valve 11 and the fourth electromagnetic directional valve 23 are three-position four-way electromagnetic directional valves with M-type middle position functions, the left electromagnet works in the left position when being powered, the oil path between the port a and the port P is communicated, the oil path between the port B and the port T is communicated, the left electromagnet works in the middle position when being powered off, the port P is communicated with the port T and then communicated with the hydraulic oil tank 5, the port a and the port B are both cut off, the right electromagnet works in the right position when being powered, the oil path between the port a and the port T is communicated, and the oil path between the port B and the port P is communicated.
Preferably, the second electromagnetic directional valve 14, the third electromagnetic directional valve 19, the fifth electromagnetic directional valve 26 and the sixth electromagnetic directional valve 31 are two-position two-way electromagnetic directional valves, which work on the left when powered, have oil passages between the ports a and B communicated, work on the right when powered, and have oil passages between the ports a and B disconnected.
Preferably, the prime mover 1 is an engine or an electric motor.
The working principle is as follows:
the microcontroller 35 obtains a first pressure value of the first energy accumulator 22 in real time through a first pressure signal fed back by the first pressure sensor 21 in real time, compares the first pressure value with a first energy storage upper limit value of the first energy accumulator 22, and determines that the first energy accumulator 22 is in a non-charging state when the first pressure value is smaller than a% of the first energy storage upper limit value (a specific numerical value can be set by the microcontroller 35), and determines that the first energy accumulator 22 is in a charging state when the first pressure value is larger than or equal to a% of the first energy storage upper limit value; a second pressure value of the second energy accumulator 34 is obtained in real time through a second pressure signal fed back by the second pressure sensor 33 in real time, the second pressure value is compared with a second energy storage upper limit value of the second energy accumulator 33, when the second pressure value is smaller than a% of the second energy storage upper limit value (the specific numerical value of a can be set by the microcontroller 35), the second energy accumulator 33 is judged to be in a non-charging state, and when the second pressure value is larger than or equal to the a% of the second energy storage upper limit value, the second energy accumulator 33 is judged to be in a charging state; the extending or retracting state of a piston rod of a hydraulic cylinder I12 is judged in real time through the change of a displacement signal I fed back by a displacement sensor I13 in real time; the extending or retracting state of the piston rod of the second hydraulic cylinder 24 is judged in real time through the change of a second displacement signal fed back by the second displacement sensor 25 in real time; acquiring a first rotating speed value of the variable motor 7 in real time through a first rotating speed signal fed back by the rotating speed sensor 8 in real time; a second rotating speed value of the prime mover 1 is obtained in real time through a second rotating speed signal fed back by a rotating speed sensor A arranged in the prime mover 1 in real time; the flow value passing through the variable motor 7 is acquired in real time through a flow signal fed back by the flow sensor 10 in real time;
When the energy accumulator I22 is in a non-charging state and a piston rod of the hydraulic cylinder I12 is in an extending state to overcome load work, the microcontroller 35 controls a right electromagnet of the electromagnetic directional valve I11 to be electrified so as to work at the right position, controls a second electromagnetic directional valve 14 to be electrified and work at the left position, and controls the prime mover 1 to act so as to drive the first fixed displacement pump I3 to rotate through the torque coupler 2, in the process, an oil suction port of the first fixed displacement pump I3 sucks oil from the hydraulic oil tank 5 through a filter 4, supplies high-pressure oil to a port P of the first electromagnetic directional valve I11, supplies the high-pressure oil to the port P of the first electromagnetic directional valve I11 to enter a port B of the second electromagnetic directional valve II 14 through the port B, supplies the rodless cavity of the hydraulic cylinder I12 through the port A of the second electromagnetic directional valve II 14, and pushes the piston rod of the hydraulic cylinder I12 to extend outwards; meanwhile, the oil in the rod cavity of the first hydraulic cylinder 12 flows back to the hydraulic oil tank 5 through a passage between the port A and the port T of the first electromagnetic directional valve 11. When the piston rod of the first hydraulic cylinder 12 is in a retraction state, that is, the external load is a negative load (the direction of the external load is consistent with the movement direction of the first hydraulic cylinder 12), the microcontroller 35 controls the left electromagnet of the first electromagnetic directional valve 11 to be electrified, so that the left electromagnet works in a left position; controlling the action of a prime motor 1 to drive a fixed displacement pump I3 to rotate through a torque coupler 2; meanwhile, when the first pressure value is smaller than a% of the first energy storage upper limit value, the second electromagnetic directional valve 14 is controlled to be powered on to work at the right position, and when the first pressure value is larger than or equal to the a% of the first energy storage upper limit value, the second electromagnetic directional valve 14 is controlled to be powered off to work at the left position; in the process, an oil suction port of the fixed displacement pump I3 sucks oil from a hydraulic oil tank 5 through a filter 4, high-pressure oil is supplied to a port P of the electromagnetic directional valve I11, and the high-pressure oil supplied to the port P of the electromagnetic directional valve I11 is supplied to a rod cavity of the hydraulic cylinder I12 through a port A of the high-pressure oil so as to push a piston rod of the hydraulic cylinder I12 to retract inwards; when the second electromagnetic directional valve 14 is in power-off operation at the right position, oil in the rodless cavity of the first hydraulic cylinder 12 is supplied to an opening A of the first fixed displacement motor 16, then flows back to the hydraulic oil tank 5 through an opening B of the first fixed displacement motor 16, so that the second fixed displacement pump 17 is driven to rotate by the oil in the rodless cavity of the first hydraulic cylinder 12, and further the second fixed displacement pump 17 is synchronously driven to rotate, in the rotating process of the second fixed displacement pump 17, the oil is absorbed from the hydraulic oil tank 5 through the opening B, is discharged from the opening A, and is supplied to the first energy accumulator 22 through the second check valve 18 for energy recovery until the first pressure value of the first energy accumulator 22 is greater than or equal to a% of the first upper energy storage limit value, so that the first energy accumulator 22 reaches a charging state; when the second electromagnetic directional valve 14 is electrified and works at the left position, oil in the rodless cavity of the first hydraulic cylinder 12 flows back to the hydraulic oil tank 5 through a passage between the second electromagnetic directional valve 14 and the port B and the port T of the first electromagnetic directional valve 11; the set pressure I of the first proportional relief valve 20 is higher than the first energy storage upper limit value of the first energy accumulator 22, preferably 1.2 times of the first energy storage upper limit value, so that the proportional relief valve can function as a safety valve. When the first energy accumulator 22 is in a charging state, the microcontroller 35 controls the third electromagnetic directional valve 19 to be powered on to work at the left position and controls the prime mover 1 to work in a low-power mode, high-pressure oil stored in the first energy accumulator 22 is supplied to an oil inlet of the spring-loaded one-way valve 9 through the third electromagnetic directional valve 19, is supplied to an A port of the variable motor 7 through an oil outlet of the spring-loaded one-way valve 9 and flows back to the hydraulic oil tank 5 through a B port of the variable motor 7, so that the variable motor 7 is driven to rotate by energy in the first energy accumulator 22, and kinetic energy is transmitted to the torque coupler 2; in the process, the microcontroller 35 controls the displacement change of the variable motor 7 in real time according to the obtained second rotating speed value to enable the first rotating speed value to be matched with the second rotating speed value in real time, so that the coupling efficiency of the torque coupler 2 is the highest, the torque coupler 2 couples the kinetic energy input by the variable motor 7 and the kinetic energy input by the prime mover 1 and then outputs the kinetic energy and drives the first fixed displacement pump 3 to rotate, and therefore the energy-saving and energy-storage recycling process of the prime mover 1 is achieved. Meanwhile, when the difference between the first rotating speed value and the second rotating speed value is greater than the set difference, the microcontroller 35 controls an alarm connected with the microcontroller to give an alarm to remind maintenance personnel to maintain the system in time.
When the second energy accumulator 34 is in a non-charging state and when a piston rod of the second hydraulic cylinder 24 is in an extending state to overcome load work, the microcontroller 35 controls the right electromagnet of the fourth electromagnetic directional valve 23 to be electrified so as to work at the right position, and controls the fifth electromagnetic directional valve 25 to be electrified so as to work at the left position, and controls the prime mover 1 to act so as to drive the first fixed displacement pump 3 to rotate through the torque coupler 2, in the process, the oil suction port of the first fixed displacement pump 3 sucks oil from the hydraulic oil tank 5 through the filter 4, high-pressure oil is supplied to the port P of the fourth electromagnetic directional valve 23, the high-pressure oil supplied to the port P of the fourth electromagnetic directional valve 23 enters the port B of the fifth electromagnetic directional valve 26 through the port B, and is supplied to a rodless cavity of the second hydraulic cylinder 24 through the port A of the fifth electromagnetic directional valve 26, and the piston rod of the second hydraulic cylinder 24 is pushed to extend outwards; meanwhile, the oil in the rod cavity of the second hydraulic cylinder 24 flows back to the hydraulic oil tank 5 through a passage between the port A and the port T of the fourth electromagnetic directional valve 23. When the piston rod of the second hydraulic cylinder 24 is in a retraction state, that is, the external load is a negative load (the direction of the external load is consistent with the moving direction of the second hydraulic cylinder 24), the microcontroller 35 controls the left electromagnet of the fourth electromagnetic directional valve 23 to be electrified, so that the left electromagnet works in a left position; controlling the action of a prime motor 1 to drive a fixed displacement pump I3 to rotate through a torque coupler 2; meanwhile, when the pressure value II is smaller than a% of the energy storage upper limit value II, controlling the electromagnetic directional valve II 26 to be electrified and work at the right position, and when the pressure value II is larger than or equal to a% of the energy storage upper limit value II, controlling the electromagnetic directional valve II 14 to be electrified and work at the left position; in the process, an oil suction port of the fixed displacement pump I3 sucks oil from a hydraulic oil tank 5 through a filter 4, high-pressure oil is supplied to a port P of the electromagnetic directional valve IV 23, and the high-pressure oil supplied to the port P of the electromagnetic directional valve IV 23 is supplied to a rod cavity of the hydraulic cylinder II 24 through a port A of the high-pressure oil so as to push a piston rod of the hydraulic cylinder II 24 to retract inwards; when the fifth electromagnetic directional valve 26 is in power-off operation at the right position, oil in the rodless cavity of the second hydraulic cylinder 24 is supplied to the port A of the second fixed displacement motor 28, then flows back to the hydraulic oil tank 5 through the port B of the second fixed displacement motor 28, so that the third fixed displacement pump 29 is driven to rotate by the oil in the rodless cavity of the second hydraulic cylinder 24, the third fixed displacement pump 29 is driven to rotate synchronously, in the rotating process of the third fixed displacement pump 29, the oil is absorbed from the hydraulic oil tank 5 through the port B, is discharged from the port A, and is supplied to the second energy accumulator 34 through the fourth check valve 30 to recover energy until the second pressure value of the second energy accumulator 34 is greater than or equal to a% of the second upper energy storage limit value, so that the second energy accumulator 34 reaches a charging state; when the fifth electromagnetic directional valve 26 is electrified and works at the left position, oil in the rodless cavity of the second hydraulic cylinder 24 flows back to the hydraulic oil tank 5 through a passage between the fifth electromagnetic directional valve 26 and the port B and the port T of the fourth electromagnetic directional valve 23; the second set pressure of the second proportional relief valve 32 is higher than the second energy storage upper limit value of the second energy accumulator 34, preferably 1.2 times the second energy storage upper limit value, so as to function as a safety valve. When the second energy accumulator 34 is in a charging state, the microcontroller 35 controls the electromagnetic directional valve six 31 to work on the left position in an electrified mode, and controls the prime mover 1 to work in a low-power mode, high-pressure oil stored in the second energy accumulator 34 is supplied to an oil inlet of the reed check valve 9 through the electromagnetic directional valve six 31, is supplied to an A port of the variable motor 7 through an oil outlet of the reed check valve 9, and flows back to the hydraulic oil tank 5 through a B port of the variable motor 7, so that the variable motor 7 is driven to rotate by using energy in the second energy accumulator 34, and kinetic energy is transmitted to the torque coupler 2, in the process, the microcontroller 35 controls the displacement change of the variable motor 7 in real time according to the obtained second rotating speed value to enable the first rotating speed value to be matched with the second rotating speed value in real time, so that the coupling efficiency of the torque coupler 2 is highest, the torque coupler 2 couples the kinetic energy input by the variable motor 7 with the kinetic energy input by the prime mover 1 and then outputs and drives the first fixed displacement pump 3 to rotate, so as to realize the energy-saving and energy-storing recycling process of the prime motor 1. Meanwhile, when the difference between the first rotating speed value and the second rotating speed value is greater than the set difference, the microcontroller 35 controls an alarm connected with the microcontroller to give an alarm to remind maintenance personnel to maintain the system in time.
The microcontroller 35 controls the displacement variation of the variable displacement motor 7 to match the rotation speed value of the prime mover 1 in the following manner: for example, assuming that the second rotation speed of the prime mover 1 is 2000rpm, if the flow rate measured by the flow rate sensor 10 is 30L/min at time 1, the displacement of the variable displacement motor 7 is adjusted to 15ml/rev, and if the flow rate measured by the flow rate sensor 10 is 15L/min at time 2, the displacement of the variable displacement motor 7 is adjusted to 7.5 ml/rev. When the accumulator does not drive the variable motor 7, the displacement of the variable motor 7 is 0.
Therefore, the full-automatic control of the energy recovery and energy recycling process can be realized.
According to the invention, the first fixed displacement motor is coaxially connected with the second fixed displacement pump, the port B of the second fixed displacement pump is connected with the hydraulic oil tank, and the port A of the second fixed displacement pump is connected with the first energy accumulator through the second one-way valve, so that the second fixed displacement pump can be synchronously driven to rotate at a high speed in the process of high-speed rotation of the first fixed displacement motor, and high-pressure oil in the hydraulic oil tank can be supplied to the first energy accumulator; a branch where a second electromagnetic reversing valve is located, a branch where a first quantitative motor and a one-way valve are located are connected in series between a rodless cavity of a first hydraulic cylinder and a port B of the first electromagnetic reversing valve, whether high-pressure oil flowing out of the rodless cavity drives the first quantitative motor to act or not can be selected according to needs, and therefore a large amount of gravitational potential energy can be released for recycling when a load on the first hydraulic cylinder descends or falls back, and the gravitational potential energy can be stored in a first energy accumulator in the form of pressure energy of the high-pressure oil; the first energy accumulator is connected with the port A of the variable motor through the third electromagnetic directional valve and the one-way valve with the spring, and the port B of the variable motor is connected with the hydraulic oil tank, so that when the stored energy in the first energy accumulator reaches a usable degree, the pressure energy stored in the first energy accumulator can be conveniently used for driving the variable motor to rotate at a high speed. The second fixed displacement motor is coaxially connected with the third fixed displacement pump, the port B of the third fixed displacement pump is connected with the hydraulic oil tank, and the port A of the third fixed displacement pump is connected with the second energy accumulator through the check valve IV, so that the third fixed displacement pump can be synchronously driven to rotate at a high speed in the high-speed rotation process of the second fixed displacement motor, and high-pressure oil in the hydraulic oil tank can be supplied to the second energy accumulator; a branch where the electromagnetic directional valve five is located, a branch where the quantitative motor two and the one-way valve three are located are connected in series between the rodless cavity of the hydraulic cylinder two and the port B of the electromagnetic directional valve four at the same time, and whether high-pressure oil flowing out of the rodless cavity drives the quantitative motor two to act or not can be selected according to needs, so that a large amount of gravitational potential energy can be released for recycling when the load on the hydraulic cylinder two is lowered or falls back, and the gravitational potential energy can be stored in the energy accumulator two in the form of pressure energy of the high-pressure oil; the energy accumulator is connected with the port A of the variable motor through the electromagnetic reversing valve six and the one-way valve with the spring, and the port B of the variable motor is connected with the hydraulic oil tank, so that when the stored energy in the energy accumulator II reaches a usable degree, the pressure energy stored in the energy accumulator II can be conveniently used for driving the variable motor to rotate at a high speed. The system can recover and recycle energy in the hydraulic system with the first hydraulic cylinder and the second hydraulic cylinder independently acting, and also can recover and recycle energy in the hydraulic system with the first hydraulic cylinder and the second hydraulic cylinder synchronously acting.

Claims (7)

1. A hydraulic system with energy recovery and reuse functions comprises a prime mover (1), a variable motor (7), a fixed displacement pump I (3), a hydraulic oil tank (5), a hydraulic cylinder I (12) and a hydraulic cylinder II (24), and is characterized by further comprising a torque coupler (2), a rotating speed sensor (8), a displacement sensor I (13), a pressure sensor I (21), a pressure sensor II (33) and a microcontroller (35); the prime motor (1) is connected with the input shaft I of the torque coupler (2) through a coupling I; the variable motor (7) is connected with the second input shaft of the torque coupler (2) through the second coupler, and the output shaft of the torque coupler (2) is connected with the first constant delivery pump (3) through the third coupler and used for coupling the input rotating speeds of the prime mover (1) and the variable motor (7) and then outputting the coupled input rotating speeds to drive the first constant delivery pump (3) to rotate; an oil suction port of the constant delivery pump I (3) is connected with the hydraulic oil tank (5), an oil discharge port of the constant delivery pump I is respectively connected with a port P of the electromagnetic directional valve I (11) and a port P of the electromagnetic directional valve II (23), and a port T of the electromagnetic directional valve I (11) and a port T of the electromagnetic directional valve II (23) are both connected with the hydraulic oil tank (5);
a rod cavity of the hydraulic cylinder I (12) is connected with an A port of the electromagnetic directional valve I (11), a rodless cavity of the hydraulic cylinder I is respectively connected with an A port of the electromagnetic directional valve II (14) and an A port of the quantitative motor I (16) through a controllable throttle valve I (36), a B port of the quantitative motor I (16) is connected with an oil inlet of the check valve I (15), and the B port of the electromagnetic directional valve II (14) and an oil outlet of the check valve I (15) are both connected with the B port of the electromagnetic directional valve I (11); the quantitative motor I (16) is coaxially connected with the quantitative pump II (17), and an A port and a B port of the quantitative pump II (17) are respectively connected with an oil inlet of the check valve II (18) and the hydraulic oil tank (5); an oil outlet of the one-way valve II (18) is respectively connected with an A port of the energy accumulator I (22) and an A port of the electromagnetic reversing valve III (19);
A rod cavity of the hydraulic cylinder II (24) is connected with an A port of the electromagnetic directional valve IV (23), a rodless cavity of the hydraulic cylinder II is respectively connected with an A port of the electromagnetic directional valve V (26) and an A port of the quantitative motor II (28) through a controllable throttle valve II (37), a B port of the quantitative motor II (28) is connected with an oil inlet of the one-way valve III (27), and the B port of the electromagnetic directional valve V (26) and an oil outlet of the one-way valve III (27) are both connected with a B port of the electromagnetic directional valve IV (23); the second metering motor (28) is coaxially connected with the third metering pump (29), and an A port and a B port of the third metering pump (29) are respectively connected with an oil inlet of the fourth check valve (30) and the hydraulic oil tank (5); an oil outlet of the check valve IV (30) is respectively connected with an A port of an energy accumulator II (34) and an A port of an electromagnetic reversing valve VI (31);
the port B of the electromagnetic directional valve III (19) and the port B of the electromagnetic directional valve VI (31) are communicated with each other and then are connected with an oil inlet of the spring-equipped one-way valve (9) through a flow sensor (10), an oil outlet of the spring-equipped one-way valve (9) is connected with the port A of the variable motor (7), and the port B of the variable motor (7) is connected with the hydraulic oil tank (5);
the rotating speed sensor (8) is connected with a transmission shaft of the variable motor (7) and is used for acquiring a rotating speed signal of the variable motor (7) in real time;
the first displacement sensor (13) is connected to a piston rod of the first hydraulic cylinder (12) and is used for acquiring a first displacement signal of the piston rod of the first hydraulic cylinder (12) in real time;
The second displacement sensor (25) is connected to a piston rod of the second hydraulic cylinder (24) and is used for acquiring a second displacement signal of a displacement signal of the piston rod of the second hydraulic cylinder (24) in real time;
the first pressure sensor (21) is connected with the first energy accumulator (22) and is used for acquiring a first pressure signal of the first energy accumulator (22) in real time;
the second pressure sensor (33) is connected with the second energy accumulator (34) and is used for acquiring a second pressure signal of the second energy accumulator (34) in real time;
the input end of the microcontroller (35) is connected with the rotating speed sensor (8), the first displacement sensor (13), the second displacement sensor (25), the first pressure sensor (21) and the second pressure sensor (33) respectively, and the output end of the microcontroller (35) is connected with the prime mover (1), the variable motor (7), the first electromagnetic directional valve (11), the second electromagnetic directional valve (14), the third electromagnetic directional valve (19), the fourth electromagnetic directional valve (23), the fifth electromagnetic directional valve (26) and the sixth electromagnetic directional valve (31) respectively.
2. The hydraulic system with the energy recovery and recycling functions as claimed in claim 1, further comprising a filter (4) and an overflow valve (6), wherein the oil suction port of the constant delivery pump I (3) is connected with the hydraulic oil tank (5) through the filter (4), and the oil discharge port of the constant delivery pump I is connected with the hydraulic oil tank (5) through the overflow valve (6).
3. The hydraulic system with the energy recovery and reuse function as claimed in claim 1 or 2, further comprising a first proportional relief valve (20) and a second proportional relief valve (32), wherein the first accumulator (22) is connected with the hydraulic oil tank (5) through the first proportional relief valve (20); and the second energy accumulator (34) is connected with the hydraulic oil tank (5) through a second proportional overflow valve (32).
4. A hydraulic system with energy recovery and re-use according to claim 3, characterized in that the microcontroller (35) is a PLC controller.
5. The hydraulic system with the energy recovery and recycling functions as claimed in claim 4, wherein the first electromagnetic directional valve (11) and the fourth electromagnetic directional valve (23) are three-position four-way electromagnetic directional valves with M-type middle position functions, the left electromagnet of the first electromagnetic directional valve works in the left position when being electrified, the oil path between the port A and the port P of the first electromagnetic directional valve is communicated, the oil path between the port B and the port T of the second electromagnetic directional valve is communicated, the port P of the second electromagnetic directional valve works in the middle position when being electrified, the port P of the second electromagnetic directional valve is communicated with the port T of the second electromagnetic directional valve and then communicated with the hydraulic oil tank (5), the port A and the port B of the second electromagnetic directional valve are both cut off, the right electromagnet of the second electromagnetic directional valve works in the right position when being electrified, the oil path between the port A and the port T of the second electromagnetic directional valve is communicated, and the oil path between the port B and the port P of the second electromagnetic directional valve is communicated.
6. The hydraulic system with the energy recovery and recycling functions as claimed in claim 5, wherein the second electromagnetic directional valve (14), the third electromagnetic directional valve (19), the fifth electromagnetic directional valve (26) and the sixth electromagnetic directional valve (31) are two-position two-way electromagnetic directional valves, which work in a left position when powered, an oil path between the ports A and B is communicated, and work in a right position when powered off, and the oil path between the ports A and B is disconnected.
7. The hydraulic system with energy recovery and reuse function according to claim 6, characterized in that said prime mover (1) is an engine or an electric motor.
CN202210165784.8A 2022-02-23 2022-02-23 Hydraulic system with energy recovery and reuse functions Pending CN114517797A (en)

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JP2018071311A (en) * 2016-11-04 2018-05-10 Ｋｙｂ株式会社 Energy regenerative system
JP2019031989A (en) * 2017-08-04 2019-02-28 コベルコ建機株式会社 Construction machine
CN109797797A (en) * 2018-12-27 2019-05-24 徐州工业职业技术学院 A kind of torque couple formula excavator swing arm potential energy recycle and reuse system

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