EP2853755B1 - Système de recyclage d'énergie pour engin de travaux - Google Patents

Système de recyclage d'énergie pour engin de travaux Download PDF

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Publication number
EP2853755B1
EP2853755B1 EP13794438.5A EP13794438A EP2853755B1 EP 2853755 B1 EP2853755 B1 EP 2853755B1 EP 13794438 A EP13794438 A EP 13794438A EP 2853755 B1 EP2853755 B1 EP 2853755B1
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European Patent Office
Prior art keywords
port
oil
valve
control
oil port
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EP13794438.5A
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German (de)
English (en)
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EP2853755A1 (fr
EP2853755A4 (fr
Inventor
Qinghua He
Zhongyong TANG
Daqing Zhang
Yunlong Zhang
Jingang Wang
Han Chen
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Sunward Intelligent Equipment Co Ltd
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Sunward Intelligent Equipment Co Ltd
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/3051—Cross-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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/30515—Load holding 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
    • 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
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid 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
    • F15B2211/30—Directional control
    • F15B2211/355—Pilot pressure control
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/76—Control of force or torque of the output member
    • F15B2211/761—Control of a negative load, i.e. of a load generating hydraulic energy
    • 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

Definitions

  • the present invention relates to a hydraulic system that can control liquid flow of an energy converter that can move mechanical components on a machine, and more particularly to a device that recovers energy from an energy converter and subsequently provides certain power for operation by using the recovered energy.
  • an excavator is a common type of engineering machinery, and lifting and dropping of an excavator boom are often implemented by acting on an oil cylinder by hydraulic oil.
  • the hydraulic oil cylinder includes a cylinder with a piston, the piston divides the cylinder into two chambers, a rod connected with the piston is connected to the boom, and the oil cylinder is connected with the main body of the excavator, to implement rise and drop of a support by extending the rod outwards from the oil cylinder and retracting the rod towards the oil cylinder.
  • positions of working devices such as the boom, the stick, the bucket and the corresponding oil cylinder are often constantly adjusted, and especially the boom is often in a cyclic movement process of being lifted from a low position to a high position and then dropped from a high position to a low position, as the boom and the stick and the bucket that act on the boom are large in mass, in terms of the principle of energy conversion, the support can be only dropped under the action of gravity, and if dropping resistance is not provided, the dropping process is prone to weightlessness.
  • valve system in this device is basic and does not take into account situations when the device is not in action and where high pressure is some parts of the device, leading to leakages and damage of the components. Therefore, it is necessary to find out an effective technology to implement energy recovery and reuse in the hydraulic system.
  • a technical problem to be solved by the present invention is to provide a working device energy recovery system, which saves energy and reduces temperature rise of hydraulic oil in a hydraulic system.
  • a working device potential energy recovery hydraulic system used in the present invention includes two energy converters, that comprise at least an unit each, a main valve, a first control signal and a second control signal, where an inlet of a pressure energy retaining valve is connected with the main valve through a switchover valve, an outlet of the pressure energy retaining valve is connected with rodless cavities of the said units of the energy converters, the said switchover valve is connected with an energy collector, an input end of a logical control member is in communication connections with the said main valve, the said units of the energy converters, the said first control signal and the said second control signal, an output end of the logical control member is connected with a control end of the switchover valve, and is characterized in that the said pressure energy retaining valve comprises unit valves, a signal OR valve, a pressure overload protection valve, a direction valve and a one-way throttle control valve.
  • Each of the two energy converters at least comprises one or more units, the units of the two energy converter may be each respectively separated into corresponding working cavities by rod pistons, the working cavities may be respectively provided with oil ports and may be directly connected with an oil port of the main valve, and the working cavities, for example first-, second-, third- and fourth-working cavities, may be respectively provided with oil ports.
  • a boom may act on the units of the energy converters.
  • the pressure energy retaining valve includes unit valves, a signal OR valve, a pressure overload protection valve, a direction valve and a one-way throttle control valve.
  • a unit valve may be provided with a first oil port, a second oil port, a third oil port and a fourth oil port, and the second oil port communicates with the fourth oil port; another unit valve may be provided with a fifth oil port, a sixth oil port, a seventh oil port and an eighth oil port, the sixth oil port may communicate with the eighth oil port, and the oil ports of the pressure energy retaining valve may be respectively connected with the first working cavity oil port and the second working cavity oil port of the first and second working cavities of the energy converters.
  • the direction valve may be provided with a first pressure input port, a second pressure input port, an oil return port and a reverse control port, the first pressure input port may communicate with the third oil port and the seventh oil port, the oil return port may be connected with an oil return path and may get oil back to an oil tank, and the reverse control port may connected to a second connecting point of the main valve at which the second control signal is input.
  • the direction valve When there is no pressure on the reverse control port, the direction valve is at a normal position, the first pressure input port and the second pressure input port are switched on, but the oil return port is not switched on; when there is pressure on the reverse control port, the direction valve is reversed to the right position, the first pressure input port and the oil return port are resistively switched on, but the second pressure input port is not switched on.
  • the signal OR valve may include a third pressure input port, a fourth pressure input port and a pressure output port, the third pressure input port may be connected with the fourth oil port of the unit valve, the fourth pressure input port may be connected with the eighth oil port of the another unit valve, and the pressure output port may be connected with the second pressure input port of the direction valve and may take a high-pressure oil signal of the third pressure input port or the fourth pressure input port through logic OR.
  • An inlet of the pressure overload protection valve may be connected to an oil path from the second pressure input port to the pressure output port, and an output port may be connected to a control oil path of the reverse control port.
  • the one-way throttle control valve may be resistively connected to an output oil path of the pressure overload protection valve, and may be used to press the reverse control port to reverse the direction valve for overload protection, which may have no throttle control effects on the second control signal.
  • the switchover valve may include a first main oil port, a second main oil port, a third main oil port, a fourth main oil port, a first control port and a second control port, where the first main oil port and the second main oil port may be respectively connected with an oil port of the main valve and an oil port of the energy collector, the third main oil port and the fourth main oil port may be respectively connected with the first oil port and the fifth oil port of the pressure energy retaining valve, and the first control port and the second control port may be respectively connected with a third control port and a fourth control port of the logical control member.
  • the switchover valve when the first control port has a signal function, the switchover valve is switched to the left position, and at this time, the first main oil port is connected with the fourth main oil port, and the third main oil port is connected with the second main oil port; when the second control port has a signal function, the switchover valve is switched to the right position, and at this time, the first main oil port is connected with the third main oil port, and the fourth main oil port is connected with the second main oil port; when both the first control port and the second control port have no signal function, the switchover valve is at the normal position (middle position), and at this time, the first main oil port is connected with the third main oil port and the fourth main oil port, but the second main oil port is not switched on.
  • the logical control member may be a hydraulic logical control member, an electric logical control member or an electro-hydraulic control logical member.
  • the logical control member may include input and output connections which may include an input connected to a first connecting point of the main valve at which the first control signal is input, an input connected to a first main oil path from the oil port of the main valve to the first main oil port of the switchover valve, an input connected to a third connecting point of the main valve at which the second control signal is input, and an input connected to a second main oil path from the oil port of the main valve to a first rod end oil port and a second rod end oil port of the energy converter; and the third control port may be connected to the first control port of the switchover valve, and the fourth control port may be connected to the second control port of the switchover valve.
  • the units of the energy converters synchronously lift the boom through the rod pistons, and, at this time, input hydraulic energy is converted to potential energy of the boom;
  • the boom drives the rod pistons of the units of the energy converters to synchronously drop, and, at this time, potential energy of the boom is converted to hydraulic energy.
  • the pressure energy retaining valve not only can prevent leakage of pressure oil in the two working cavities of the energy converters, to retain the boom in situ, but also can prevent the pressure oil in the two working cavities of the energy converters from having too high pressure.
  • working oil can be respectively introduced into the second oil port and the sixth oil port unidirectionally from the first and fifth oil ports, and during a dropping operation, the second control signal acts on the reverse control port, the direction valve is reversed, and the pressure oil from the two working cavities of the energy converters is respectively introduced into the first oil port and the fifth oil port from the second oil port and the sixth oil port.
  • the switchover valve when the first control port and the second control port have no signal function, the switchover valve is at the middle position, and conventional lifting and dropping operations of the boom without potential energy harvesting can be performed; when the first control port has a signal function and the switchover valve is at the left position, a loop connected to the third main oil port of the main valve, the first main oil port and the fourth main oil port, the fifth oil port and the sixth oil port of the pressure energy retaining valve, and the second working cavity oil port of an unit of the energy converter forms a passage, and a loop connected to the oil port of the energy collector, the second main oil port and the third main oil port, the first oil port and the second oil port of the pressure energy retaining valve, and the first working cavity oil port of an other unit of the energy converter also forms a passage.
  • a loop connected to the third main oil port of the main valve, the first main oil port and the third main oil port of the switchover valve, the first oil port and the second oil port of the pressure energy retaining valve, and the first working cavity oil port of an unit of the energy converter forms a passage
  • a loop connected to the oil port of the energy collector, the second main oil port and the fourth main oil port of the switchover valve, the fifth oil port and the sixth oil port of the pressure energy retaining valve, and the second working cavity oil port of an other unit of the energy converter forms a passage.
  • the logical control member can respectively control the signal functions of the first control port and the second control port of the switchover valve according to the pressure of the first main oil path or the second main oil path, can directly or indirectly introduce the first control signal and the second control signal into the first control port and the second control port of the switchover valve when pressure of the first main oil path or the second main oil path does not reach a set value of the logical control member, and, otherwise, removes the signal functions of the first control port and the second control port of the switchover valve.
  • the first control signal and the second control signal may be hydraulic pressure signals and/or electrical signals, and may be directly or indirectly taken from an operating handle.
  • the present invention is applied to recycling of potential energy of an excavator boom, charges the potential energy of the boom into an energy collector through corresponding control when the boom drops, and when an excavator is performing arm lifting and energy consumption operations, releases stored oil to directly do work by controlling the switchover valve, and reduces input power of a prime mover.
  • the present invention has a simple principle, is easy to control, has reliable performance, and can automatically achieve exchange and cooling of hot oil in the energy collector, which not only can reduce heat generated by a hydraulic system and save energy, but also can reduce emissions of the prime mover.
  • FIG. 1 is a schematic structural diagram of Embodiment 1.
  • a working device potential energy recovery hydraulic system includes two energy converters that at least include a unit 1.1, 1.2 each, a main valve 6, a first control signal Signal-a and a second control signal Signal-b.
  • An inlet of a pressure energy retaining valve 2 is connected with the main valve 6 through a switchover valve 3, an outlet of the pressure energy retaining valve 2 is connected with rodless cavities of the units 1.1, 1.2 of the energy converters, the switchover valve 3 is connected with an energy collector 4, an input end of a logical control member 5 is in communication connections with the main valve 6, the units 1.1, 1.2 of the energy converters, the first control signal Signal-a and the second control signal Signal-b, and an output end of the logical control member 5 is connected with a control end of the switchover valve 3.
  • Each of the units 1.1, 1.2 of the energy converters is separated into corresponding working cavities 1.1b, 1.1c, 1.2b, 1.2c by a rod piston 1.1a, 1.2a, the working cavities 1.1b, 1.2b are each provided with an oil port B1, B2 and are directly connected with an oil port B of the main valve, and the working cavities 1.1c, 1.2c are each provided with an oil port A1, A2.
  • the pressure energy retaining valve 2 includes: unit valves 2a, 2b, a signal OR valve 2c, a pressure overload protection valve 2d, a direction valve 2e and a one-way throttle control valve 2f, where the unit valve 2a is provided with a first oil port Ia, a second oil port IIa, a third oil port IIIa and a fourth oil port IVa, and the second oil port IIa communicates with the fourth oil port IVa; the unit valve 2b is provided with a fifth oil port Ib, a sixth oil port IIb, a seventh oil port IIIb and an eighth oil port IVb, the sixth oil port IIb communicates with the eighth oil port IVb, and the second oil port IIa and the sixth oil port IIb are respectively connected with the first working cavity oil port A1 and the second working cavity oil port A2 of 1.1c, 1.2c of the energy converters; the direction valve 2e is provided with a first pressure input port k1, a second pressure input port k2, an oil return port kt and a reverse control port
  • the switchover valve 3 includes: a first main oil port P1, a second main oil port P2, a third main oil port A, a fourth main oil port B, a first control port Ka4 and a second control port Kb4, where the first main oil port P1 and the second main oil port P2 are respectively connected with an oil port A of the main valve and an oil port X of the energy collector, the third main oil port A and the fourth main oil port B are respectively connected with the first oil port Ia and the fifth oil port Ib of the pressure energy retaining valve 2and the first control port Ka4 and the second control port Kb4 are respectively connected with a third control port Pp1 and a fourth control port Pp2 of the logical control member 5.
  • Input and output connections of the logical control member 5 include: input Ka2 is connected to a first connecting point S1 of the main valve at which the first control signal Signal-a is input, input Ka3 is connected to a first main oil path E from the oil port A of the main valve to the oil port P1 of the switchover valve, input Kb2 is connected to a third connecting point S3 of the main valve at which the second control signal Signal-b is input, and input Kb3 is connected to a second main oil path F from the oil port B of the main valve to a first rod end oil port B1 and a second rod end oil port B2 of the energy converter; and output Pp1 is connected to the first control port Ka4 of the switchover valve 3, and output Pp2 is connected to the second control port Kb4 of the switchover valve 3.
  • the logical control member 5 is a hydraulic logical control member, an electric logical control member or an electro-hydraulic control logical member.
  • the signals Signal-a and Signal-b are hydraulic pressure signals and/or electrical signals, and are directly or indirectly taken from an operating handle.
  • the units 1.1 and 1.2 of the energy converters when pressure oil is introduced into the two working cavities 1.1c and 1.2c of the units 1.1 and 1.2 of the energy converters and the other two working cavities 1.1b and 1.2b are reconnected to the oil tank, the units 1.1 and 1.2 of the energy converters synchronously lift the boom through the rod pistons 1.1a and 1.2a, and at this time, input hydraulic energy can be converted to potential energy of the boom; when pressure oil is introduced into the two working cavities 1.1b and 1.2b of the units 1.1 and 1.2 of the energy converters and the other two working cavities 1.1c and 1.2c are connected externally, the boom drives the rod pistons 1.1a and 1.2a of the units 1.1 and 1.2 of the energy converters to synchronously drop, and at this time, potential energy of the boom is converted to hydraulic energy.
  • the pressure energy retaining valve 2 when lifting and dropping operations of the boom are not performed, the pressure energy retaining valve not only can prevent leakage of pressure oil in the two working cavities 1.1c and 1.2c of the energy converters, to retain the boom in situ, but also can prevent that the pressure oil in the two working cavities 1.1c and 1.2c of the energy converter has too high pressure and therefore damages components.
  • the switchover valve 3 by correspondingly controlling signals that act on the first control port Ka4 and the second control port Kb4, the following functions can be achieved: 1) oil paths from the oil port A of the main valve and the oil port X of the energy collector to the two cavities 1.1c and 1.2c of the energy converters are alternately switched on, which not only achieves the objective of harvesting and utilizing potential energy but also can achieve exchange and cooling of hot oil of the energy collector; 2) when lifting and dropping operations of the boom are performed, for example, the first main oil path E and the second main oil path F are in a state in which the pressure reaches a set pressure value of the logical control member, the logical control member removes a signal acting on the first control port Ka4 or the second control port Kb4, the switchover valve returns to the middle position, and conventional operations without energy conservation can be performed.
  • the energy collector 4 it not only can collect dropping potential energy of the boom, but also can provide power when the boom is lifted.
  • the logical control member 5 it is mainly used to detect pressure of the first main oil path E or the second main oil path), for example, when the pressure does not reach the set value of the logical control member, it directly or indirectly introduces the first control signal Signal-a and the second control signal Signal-b into the first control port Ka4 and the second control port Kb4 of the switchover valve for reverse control, and otherwise, it removes acting signals of the first control port Ka4 and the second control port Kb4 of the switchover valve.
  • an operating handle inputs a signal to enable the first control signal Signal-a to be effective
  • the main valve is switched to the left position under the action of the first control signal Signal-a
  • pressure oil on an oil path P of the main valve can be introduced into the port A of the main valve
  • return oil of the port B of the main valve can be introduced into an oil return path T.
  • the switchover valve has the following two working states:
  • the operating handle inputs a signal to enable the second control signal Signal-b to be effective
  • the main valve is switched to the right position under the action of the second control signal Signal-b
  • pressure oil on an oil path P of the main valve can be introduced into the port B of the main valve
  • return oil of the port A of the main valve can be introduced into the oil return path T.
  • the switchover valve also has the following two working states:

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Claims (12)

  1. - Système de récupération d'énergie d'engin de travaux, comprenant deux convertisseurs d'énergie qui comprennent chacun au moins une unité (1.1, 1.2), une vanne principale (6), un premier signal de commande (Signal-a) et un second signal de commande (Signal-b), une entrée d'une vanne de retenue d'énergie de pression (2) étant reliée à la vanne principale (6) par l'intermédiaire d'une vanne d'inversion (3), une sortie de la vanne de retenue d'énergie de pression (2) étant reliée à des cavités sans tige desdites unités (1.1, 1.2) des convertisseurs d'énergie, ladite vanne d'inversion (3) étant reliée à un collecteur d'énergie (4), une extrémité d'entrée d'un élément de commande logique (5) étant en liaisons de communication avec ladite vanne principale (6), lesdites unités (1.1, 1.2) des convertisseurs d'énergie, ledit premier signal de commande (Signal-a) et ledit second signal de commande (Signal-b), une extrémité de sortie de l'élément de commande logique (5) étant reliée à une extrémité de commande de la vanne d'inversion (3), caractérisé par le fait que ladite vanne de retenue d'énergie de pression (2) comprend des vannes unitaires (2a, 2b), une vanne OU de signal (2c), une vanne anti-surcharge de pression (2d), une vanne de sélection (2e) et une vanne de commande d'étranglement unidirectionnelle (2f).
  2. - Système de récupération d'énergie d'engin de travaux selon la revendication 1, dans lequel chacun des deux convertisseurs d'énergie comprend au moins une ou plusieurs unités (1.1, 1.2), chaque unité est séparée en cavités de travail correspondantes (1.1b, 1.1c, 1.2b, 1.2c) par un piston à tige (1.1a, 1.2a), les cavités de travail (1.1b, 1.2b) comportent chacune un orifice d'huile (B1, B2) et sont directement reliées à un orifice d'huile (B) de la vanne principale, et les cavités de travail (1.1c, 1.2c) comportent chacune un orifice d'huile (A1, A2).
  3. - Système de récupération d'énergie d'engin de travaux selon la revendication 1 ou 2, dans lequel une vanne unitaire (2a) comporte un premier orifice d'huile (Ia), un deuxième orifice d'huile (IIa), un troisième orifice d'huile (IIIa) et un quatrième orifice d'huile (IVa), et le deuxième orifice d'huile (IIa) communique avec le quatrième orifice d'huile (IVa).
  4. - Système de récupération d'énergie d'engin de travaux selon les revendications 1 à 3, dans lequel une autre vanne unitaire (2b) comporte un cinquième orifice d'huile (Ib), un sixième orifice d'huile (IIb), un septième orifice d'huile (IIIb) et un huitième orifice d'huile (IVb), et le sixième orifice d'huile (IIb) communique avec le huitième orifice d'huile (IVb), et le deuxième orifice d'huile (IIa) et le sixième orifice d'huile (IIb) sont reliés respectivement au premier orifice d'huile de cavité de travail (A1) et au second orifice d'huile de cavité de travail (A2) des convertisseurs d'énergie (1.1c, 1.2c).
  5. - Système de récupération d'énergie d'engin de travaux selon la revendication 4, dans lequel la vanne de sélection (2e) comporte un premier orifice d'entrée de pression (k1), un deuxième orifice d'entrée de pression (k2), un orifice de retour d'huile (kt) et un orifice de commande inverse (Kb5), le premier orifice d'entrée de pression (k1) communique avec le troisième orifice d'huile (IIIa) et le septième orifice d'huile (IIIb), l'orifice de retour d'huile (kt) est relié à un trajet de retour d'huile (T2) et renvoie l'huile vers un réservoir d'huile, et l'orifice de commande inverse (Kb5) est relié à un deuxième point de raccordement (S2) de la vanne principale, au niveau duquel le second signal de commande (Signal-b) est entré.
  6. - Système de récupération d'énergie d'engin de travaux selon la revendication 4, dans lequel la vanne OU de signal (2c) comprend un troisième orifice d'entrée de pression (a), un quatrième orifice d'entrée de pression (b) et un orifice de sortie de pression (c), le troisième orifice d'entrée de pression (a) est relié au quatrième orifice d'huile (IVa) de la vanne unitaire (2a), le quatrième orifice d'entrée de pression (b) est relié au huitième orifice d'huile (IVb) de la vanne unitaire (2b), et l'orifice de sortie de pression (c) est relié au deuxième orifice d'entrée de pression (k2) de la vanne de sélection et traite un signal d'huile haute pression du troisième orifice d'entrée de pression (a) ou du quatrième orifice d'entrée de pression (b) par l'intermédiaire d'une logique OU.
  7. - Système de récupération d'énergie d'engin de travaux selon la revendication 5, dans lequel une entrée de la vanne anti-surcharge de pression (2d) est reliée à un trajet d'huile (G) allant du deuxième orifice d'entrée de pression (k2) à l'orifice de sortie de pression (c), et un orifice de sortie est relié à un trajet d'huile de commande (H) de l'orifice de commande inverse (Kb5).
  8. - Système de récupération d'énergie d'engin de travaux selon l'une quelconque des revendications 1 à 7, dans lequel la vanne de commande d'étranglement unidirectionnelle (2f) est reliée de façon résistive à un trajet d'huile de sortie de la vanne anti-surcharge de pression (2d), et est utilisée pour presser l'orifice de commande inverse (Kb5), pour inverser la vanne de sélection (2e) pour une protection contre une surcharge, qui n'a pas d'effets de commande d'étranglement sur le second signal de commande (Signal-b).
  9. - Système de récupération d'énergie d'engin de travaux selon l'une quelconque des revendications 1 à 8, dans lequel la vanne d'inversion (3) comprend un premier orifice d'huile principal (P1), un deuxième orifice d'huile principal (P2), un troisième orifice d'huile principal (A), un quatrième orifice d'huile principal (B), un premier orifice de commande (Ka4) et un deuxième orifice de commande (Kb4), le premier orifice d'huile principal (P1) et le deuxième orifice d'huile principal (P2) sont reliés respectivement à un orifice d'huile (A) de la vanne principale et un orifice d'huile (X) du collecteur d'énergie, le troisième orifice d'huile principal (A) et le quatrième orifice d'huile principal (B) sont reliés respectivement au premier orifice d'huile (Ia) et au cinquième orifice d'huile (Ib) de la vanne de retenue d'énergie de pression (2), le premier orifice de commande (Ka4) et le deuxième orifice de commande (Kb4) étant reliés respectivement à un troisième orifice de commande (Pp1) et à un quatrième orifice de commande (Pp2) de l'élément de commande logique (5).
  10. - Système de récupération d'énergie d'engin de travaux selon la revendication 9, dans lequel des liaisons d'entrée et de sortie de l'élément de commande logique (5) comprennent une entrée (Ka2) reliée à un premier point de liaison (S1) de la vanne principale, au niveau duquel le premier signal de commande (Signal-a) est entré, une entrée (Ka3) reliée à un premier trajet d'huile principal (E) allant de l'orifice d'huile (A) de la vanne principale au premier orifice d'huile principal (P1) de la vanne d'inversion, une entrée (Kb2) reliée à un troisième point de liaison (S3) de la vanne principale, au niveau duquel le second signal de commande (Signal-b) est entré, une entrée (Kb3) reliée à un second trajet d'huile principal (F) allant de l'orifice d'huile (B) de la vanne principale à un premier orifice d'huile d'extrémité de tige (B1) et un second orifice d'huile d'extrémité de tige (B2) du convertisseur d'énergie, le troisième orifice de commande (Pp1) étant relié au premier orifice de commande (Ka4) de la vanne d'inversion (3), et le quatrième orifice de commande (Pp2) étant relié au deuxième orifice de commande (Kb4) de la vanne d'inversion (3).
  11. - Système de récupération d'énergie d'engin de travaux selon l'une quelconque des revendications 1 à 10, dans lequel l'élément de commande logique (5) est un élément de commande logique hydraulique, un élément de commande logique électrique ou un élément de commande logique électrohydraulique.
  12. - Système de récupération d'énergie d'engin de travaux selon l'une quelconque des revendications 1 à 11, dans lequel le premier signal de commande (Signal-a) et le second signal de commande (Signal-b) sont des signaux de pression hydraulique et/ou des signaux électriques, et proviennent directement ou indirectement d'une poignée de commande.
EP13794438.5A 2012-05-22 2013-05-17 Système de recyclage d'énergie pour engin de travaux Active EP2853755B1 (fr)

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CN2012202325362U CN202926765U (zh) 2012-05-22 2012-05-22 工作装置势能回收液压系统
PCT/CN2013/075812 WO2013174235A1 (fr) 2012-05-22 2013-05-17 Système de recyclage d'énergie pour engin de travaux

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AU2013265872A1 (en) 2014-12-04
AU2013265872B2 (en) 2017-03-09
CN202926765U (zh) 2013-05-08
EP2853755A4 (fr) 2015-07-08
SG11201407604WA (en) 2015-01-29
WO2013174235A1 (fr) 2013-11-28

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