WO1998013603A1 - Systeme de recuperation/reutilisation d'huile hydraulique - Google Patents

Systeme de recuperation/reutilisation d'huile hydraulique Download PDF

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Publication number
WO1998013603A1
WO1998013603A1 PCT/JP1997/003416 JP9703416W WO9813603A1 WO 1998013603 A1 WO1998013603 A1 WO 1998013603A1 JP 9703416 W JP9703416 W JP 9703416W WO 9813603 A1 WO9813603 A1 WO 9813603A1
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WO
WIPO (PCT)
Prior art keywords
pressure
valve
circuit
pump
oil
Prior art date
Application number
PCT/JP1997/003416
Other languages
English (en)
Japanese (ja)
Inventor
Hiroshi Endo
Nobumi Yoshida
Kazuhiro Maruta
Original Assignee
Komatsu Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Komatsu Ltd. filed Critical Komatsu Ltd.
Priority to JP51549998A priority Critical patent/JP3362258B2/ja
Publication of WO1998013603A1 publication Critical patent/WO1998013603A1/fr

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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
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
    • E02F9/2235—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps including an electronic controller
    • 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
    • E02F9/2292—Systems with two or more pumps
    • 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
    • E02F9/2296—Systems with a variable displacement pump
    • 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
    • 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

Definitions

  • the present invention relates to a construction machine such as a power shovel that stores high-pressure oil with the energy of return hydraulic oil from a hydraulic actuator and uses the stored high-pressure oil as an operating energy of the actuator. This is related to a pressure oil recovery and reuse system that is reused. Background art
  • an upper revolving structure is provided on a lower vehicle body equipped with a traveling body so as to be pivotable with a hydraulic motor for pivoting, and a boom is attached to the upper revolving structure so as to be able to swing up and down with a boom cylinder.
  • an arm is attached to the boom by an arm cylinder so that the arm can swing up and down
  • a bucket is attached to the arm by a bucket cylinder so that the arm can swing up and down.
  • the hydraulic motor for turning the power shovel, the cylinder for the boom, the cylinder for the arm, and the cylinder for the bucket are provided with the discharge hydraulic oil of the hydraulic pump in one chamber by switching the directional control valve. While supplying pressure oil from the other chamber to the tank.
  • a boom directional control valve supplies hydraulic pressure from the hydraulic pump to the extension chamber of the boom cylinder and the pressure of the contraction chamber.
  • the oil flows out to the tank and expands, supplying the pressure oil from the hydraulic pump to the compression chamber of the boom cylinder, and the hydraulic oil in the expansion chamber flows out to the tank and contracts.
  • the return hydraulic oil for the turning hydraulic motor, the boom cylinder, the arm cylinder, and the bucket cylinder is returned to the tank because the pressure oil flows out to the tank. Energy of pressurized oil cannot be used.
  • this pressure oil recovery and reuse system connects the chamber 2 of the single-acting cylinder 1, which is the factory, to the port 4 of the first pump / motor 3, as shown in Figure 1.
  • Connect the port 6 of the second pump 5 which is mechanically connected to the first pump motor 3 to the hydraulic oil supply circuit 7, and connect the pressure oil supply circuit 7 to the check valve 8 by the check valve 8.
  • the reservoir is connected to a hydraulic pressure source via a pressure reservoir 9.
  • the second pump motor 5 acts as a motor by supplying the pressure oil of the hydraulic source to the pressure oil supply circuit 7 to drive the first pump motor 3 and the first pump motor Overnight 3 power
  • the pump acts to supply pressure oil to the chamber 2 of the single-acting cylinder 1 so that the single-acting cylinder 1 extends and operates.
  • the single-acting cylinder 1 contracts and operates with an external load, and pressure is generated in the return pressure oil in the chamber 2 to start the first pump motor 3. Drives and acts overnight.
  • the second pump / motor 5 pumps and high-pressure oil is generated in the pressure oil supply circuit 7, and the high-pressure oil is blocked by the check valve 8, and the high-pressure oil is stored in the pressure reservoir 9. It is stored.
  • the high-pressure oil stored in the pressure accumulator 9 drives the second pump motor 5.
  • the first pump and the motor 3 act as a pump to supply high-pressure oil to the chamber 2 and reuse the pressurized oil (energy) stored in the accumulator 9.
  • the system described above stores high-pressure oil with the energy of the return pressure oil in chamber 2 of single-acting cylinder 1, and supplies the pressure oil to chamber 2 of single-acting cylinder 1 again with the stored high-pressure oil. Therefore, the stored high-pressure oil is only reused for the single-acting cylinder 1 and cannot be reused for other factories.
  • an object of the present invention is to provide a hydraulic oil recovery and reuse system that can solve the above-mentioned problems.
  • the first invention relates to a first pump 'motor 16 and a second pump' motor 1 which are mechanically connected by the energy of the return pressure oil of the work which is operated by the pressure oil of the hydraulic power source.
  • Consists of 7 A pressure oil recovery and reuse system characterized by operating a pressure transducer 18 to supply high-pressure oil to the hydraulic source.
  • the return pressure oil recovered from the actuator is returned. Energy can be reused for other work overnight activities.
  • the second invention comprises a main hydraulic pump 10 for supplying pressure oil to the actuator, a first circuit 22 to which return pressure oil from the actuator is supplied, and the first circuit 22.
  • a third circuit 29 communicating the first circuit 22 with the discharge passage 11 of the main hydraulic pump 10; a pressure reservoir 27 provided in the second circuit 25;
  • a pressure oil recovery and reuse system characterized by comprising a regeneration valve 30 that switches the third circuit 29 between a state in which pressure oil flow is allowed and a state in which pressure oil flow is blocked.
  • the third circuit 29 is switched to the state in which the flow of the hydraulic oil is blocked by the regeneration valve 30, so that the first pump ′ and the motor 16 are driven by the return hydraulic oil.
  • High pressure oil can be stored in the pressure accumulator 27 since the second pump-motor 17 operates as a pump.
  • the second pump Since the first pump 17 and the first pump 16 operate to operate the pump, pressure oil is discharged to the first circuit 22 and the main hydraulic port is discharged via the third circuit 29. It is supplied to the discharge path 11 of the pump 10. As a result, the energy of the pressurized oil at the factory can be reused for the operation of other factories.
  • the output torque of the second pump / motor 17 is increased or decreased by increasing or decreasing the capacity of the second pump / motor 17, that is, the first pump. 'Since the torque for driving the motor 16 changes, the pressure in the first circuit 22 is increased or decreased by the pump action of the first pump motor 16.
  • the pressure in the first circuit 22 is equal to or slightly higher than the pressure in the discharge passage 11 of the main hydraulic pump 10 and the pressure in the first circuit 22 is increased. It can be reused by supplying it to the 0 discharge path 11.
  • a pressure accumulating valve 26 for communicating with and shutting off a second circuit 25 in the second aspect of the invention is provided, and a second pump mode is provided rather than the pressure accumulating valve 26 in the second circuit 25.
  • This is a pressure oil recovery and reuse system that has a sequence valve 28 between the side of the evening 17 and the discharge path 11 of the main hydraulic pump 10.
  • the high-pressure oil stored in the pressure accumulator 27 is discharged. Leakage can be prevented.
  • the high-pressure oil in the second circuit 25 is supplied from the sequence valve 28 to the main hydraulic pump 10. Since the pressure is supplied to the discharge path 11, the capacity of the pressure accumulator 27 can be reduced.
  • the pressure-accumulation valve 26 is closed when the second pump / motor 17 is pumped and accumulates pressure, the high-pressure oil discharged from the second pump / motor 17 will be discharged from the sequence valve 28 From this, it is supplied directly to the discharge passage 11 of the main hydraulic pump 10.
  • the fourth invention comprises a main hydraulic pump 10 for supplying pressure oil to the actuator, a first circuit 22 to which return pressure oil from the actuator is supplied, and a second circuit 22 for supplying the return pressure oil from the actuator.
  • a recovery valve 23 for switching the circuit 22 between a first state in which the pressurized oil flow is allowed and a second state in which the oil flow is blocked; a first pump / motor 16 connected to the first circuit 22; A pressure transducer 18 having a variable displacement second pump motor 17 mechanically connected to the first pump motor 16 and connected to the second circuit 25; and the first circuit.
  • a third circuit 29 communicating the discharge passage 11 of the main hydraulic pump 10 with the second circuit 22, a pressure accumulator 27 provided in the second circuit 25, and a third circuit 29.
  • the set pressure variable type set valve 2 provided between the second pump / motor 17 and the discharge path 11 of the main hydraulic pump 10 rather than the pressure storage valve 26 in 25
  • This is a system for collecting and reusing pressurized oil, characterized in that the system consists of 8 components.
  • the recovery valve 23 after storing the high-pressure oil in the pressure accumulator 27, the recovery valve 23 is in the second state (closed), the pressure accumulating valve 26 is in the communicating state, and the regeneration valve 30 is in the second state. 1 (open) and the set pressure of the sequence valve 28 is set to a high pressure, so that the stored high-pressure oil passes from the third circuit 29 via the pressure transducer 18 to the main hydraulic pressure. It can be supplied to the discharge path 11 of the pump 10.
  • the collection valve 23 and the regeneration valve 30 are set to the second state (closed), the pressure accumulation valve 26 is set to the communication state, and the set pressure of the sequence valve 28 is set to a low pressure. Then, the stored high-pressure oil can be supplied to the discharge passage 11 of the main hydraulic pump 10 through the sequence valve 28.
  • the pressure transducer 18 can be driven by the high-pressure oil stored in the pressure accumulator 27 to supply low-pressure, large-flow pressure oil to the discharge path 11, and the pressure accumulator 27
  • the high-pressure oil stored in the tank can be supplied to the discharge passage 11 through the sequence valve 28.
  • the collection valve 23 When the actuator is operating, the collection valve 23 is set to the first state (open), the pressure accumulation valve 26 is set to the shut off state, the regeneration valve 30 is set to the second state (closed), and the sequence is set.
  • the set pressure of the valve 28 By setting the set pressure of the valve 28 to a low pressure, the return pressure oil of the first circuit 22 can be supplied to the discharge path 11 via the pressure transducer 18 and the sequence valve 28.
  • the collection valve 23 and the regeneration valve 30 are set to the first state (open), the storage valve 26 is set to the closed state, and the set pressure of the sequence valve 28 is set to high.
  • the return pressure oil of the first circuit 22 can be supplied to the discharge path 11 through the third circuit 29.
  • the return pressure oil from Akuchiyue overnight The pressure can be increased by the pressure transducer 18 without storing the pressure and supplied to the discharge path, and the return pressure oil can be efficiently supplied to the discharge path 11 via the third circuit 29 without storing the pressure.
  • a first means for detecting a discharge pressure P 2 of the main hydraulic pump 10 and a second means for detecting a stored pressure P 1 of a pressure accumulator 27 of the second circuit 25 are provided.
  • Means and the recovery valve 23, the pressure accumulation valve 26, and the regeneration valve 30 are switched based on the pressure detected by the first and second means, and the set pressure of the sequence valve 28 is changed.
  • a third means wherein when the differential pressure between the storage pressure P 1 and the discharge pressure P 2 is equal to or higher than a set differential pressure, the recovery valve 23 is set to the second state (closed); 26 is in the communicating state, the regeneration valve 30 is in the first state (open), the set pressure of the sequence valve 28 is high, and the differential pressure between the storage pressure P 1 and the discharge pressure P 2 is high.
  • the collection valve 23 and the regeneration valve 30 are brought into the second state (closed), the pressure accumulation valve 26 is brought into the communicating state, and the set pressure of the sequence valve 28 is reduced
  • the fourth aspect of the present invention is a pressure oil recovery and reuse system having a function of reducing pressure.
  • the recovery valve 23 when the differential pressure between the storage pressure P 1 and the discharge pressure P 2 is equal to or higher than the set pressure difference, the recovery valve 23 is in the second state (closed), the storage valve 26 is in the communicating state, and the regeneration is performed.
  • the valve 30 When the valve 30 is in the first state (open), the set pressure of the sequence valve 28 becomes high, and the stored high-pressure oil flows from the third circuit 29 through the pressure transducer 18. It is supplied to the discharge passage 11 of the main hydraulic pump 10.
  • the high-pressure oil stored according to the differential pressure between the storage pressure P1 and the discharge pressure P2 is supplied through the pressure transducer 18 or supplied through the sequence valve 28. If possible, the stored high-pressure oil can be efficiently supplied to the discharge passage 11 efficiently.
  • a first means for detecting a discharge pressure P 2 of the main hydraulic pump 10 and a third means for detecting a pressure P 3 of the return pressure oil of the first circuit 22.
  • the third means for switching the set pressure of the sequence valve 28 while switching the recovery valve 23, the pressure storage valve 26, and the regeneration valve 30 based on the pressure detected by the first and third means.
  • the third means comprises: when the pressure P 3 is lower than the discharge pressure P 2, the recovery valve 23 is in the first state (open), the pressure accumulation valve 26 is shut off, and the regeneration valve 30 is In addition to the second state (closed), the set pressure of the sequence valve 28 is set to a low pressure, and when the pressure P 3 is higher than the discharge pressure P 2, the recovery valve 23 and the regeneration valve 30 are turned on. In the first state (open), it has a function to shut off the pressure accumulation valve 26 and set the set pressure of the sequence valve 28 to a high pressure.
  • the recovery valve 23 when the pressure P3 of the return pressure oil is lower than the discharge pressure P2, the recovery valve 23 is in the first state (open), the storage valve 26 is in the shut-off state, and the regeneration is performed.
  • the valve 30 When the valve 30 is in the second state (closed), the set pressure of the sequence valve 28 becomes low, 1 Return of the circuit 2 2 Pressure oil is supplied to the discharge path 11 via the pressure transducer 18 and the sequence valve 28.
  • FIG. 1 is a conventional hydraulic circuit diagram.
  • FIG. 2 is a hydraulic circuit diagram showing the first embodiment of the present invention.
  • FIG. 3 is a hydraulic circuit diagram showing a second embodiment of the present invention.
  • FIG. 4 is a hydraulic circuit diagram showing a third embodiment of the present invention. Suitable bear for carrying out the invention
  • the discharge path 11 of the main hydraulic pump 10 is provided with a first directional control valve 12 and a second directional control valve 13 so that the first actuator 14 and the second directional control valve 13 are provided. It is designed to supply pressurized oil to the factory 15th.
  • the pressure transducer 18 is obtained by mechanically connecting the first pump 'Money 16' and the second pump 'Money 17'.
  • the first pump-motor 16 is a variable displacement type whose capacity changes by changing the inclination angle of the swash plate 19, and the second pump-motor 17 is the inclination angle of the swash plate 20. It is a variable capacity type in which the capacity changes by changing.
  • the main port 21 of the first pump / motor 16 is connected to a first circuit 22, which passes through a recovery valve 23 and a return port 1 of a first directional control valve 12. 2a, connected to the return port 13a of the second directional control valve 13 to be supplied with return pressure oil of the first actuator 14 and the second actuator 15.
  • the main port 24 of the second pump / motor 17 is connected to a second circuit 25.
  • the second circuit 25 is connected to a pressure accumulator 27 via a pressure accumulating valve 26 and to a discharge passage 11 of the main hydraulic pump 10 via a sequence valve 28.
  • the first circuit 22 is connected to a discharge path 11 of the main hydraulic pump 10 by a third circuit 29.
  • the third circuit 29 is provided with a regeneration valve 30.
  • the regeneration valve 30, the recovery valve 23, and the pressure storage valve 26 are closed by springs 30a, 23a, 26a. It is held in position a, and when it is energized to solenoids 30b, 23b, 26b, it becomes open position b.
  • a first pressure sensor 31 is provided in a discharge path 11 of the main hydraulic pump 10, and a second pressure sensor 32 is provided in a first circuit 22.
  • the detection pressures of the first pressure sensor 31 and the second pressure sensor 32 are input to the controller 33.
  • the controller 33 inputs the displacement control signal to the displacement control member 34 of the second pump motor 17 when the reuse signal is inputted, and detects the detected pressure of the first pressure sensor 31 1
  • the capacity of the second pump motor 17 is controlled so that the detected pressures of the second pressure sensor 32 become equal.
  • the solenoid 23b of the recovery valve 23 is energized to the open position b, and the solenoid 26a of the accumulator 26 is energized to the open position b.
  • the first directional control valve 12 is set to the first position c and one of the chambers 14a of the first actuator 14 is supplied with pressurized oil and contracted, the other chamber 14 is operated.
  • the return pressure oil in b flows into the first circuit 22 from the return port 12a.
  • the regeneration valve 30 is in the closed position a.
  • the pressure oil that has flowed into the first circuit 22 flows into the main port 21 of the first pump / motor 16, and the first pump / motor 16 operates as a motor.
  • Drive 7. At this time, the capacity of the second pump / motor 17 is reduced to discharge high-pressure oil when driven with the same drive torque.
  • This operation is performed by inputting a recovery signal to the controller 33.
  • a small capacity signal may be output to the capacity control member 34 by the controller 33.
  • solenoid 33 b of the collection valve 23 and the solenoid 26 b of the pressure accumulation valve 26 may be energized by the controller 33.
  • the second pump 17 operates as a pump to discharge high-pressure oil to the second circuit 25 and store the high-pressure oil in the pressure accumulator 27.
  • the pressure of the second circuit 25 becomes higher than the set pressure of the sequence valve 28, and the high pressure oil of the second circuit 25 Is supplied to the discharge passage 11 of the main hydraulic pump 10.
  • the regeneration valve 30 since the regeneration valve 30 is in the closed position a, the return pressure oil flowing into the first circuit 22 is higher than the pressure in the discharge path 11 and flows into the discharge path 11. If the pressure in the discharge path 11 is higher than the return pressure oil flowing into the first circuit 22, it does not flow into the first circuit 22.
  • the pressure storing valve 26 is set to the closed position a so as to keep the high-pressure oil stored in the pressure storing device 27 from flowing out.
  • the second pump motor 16 pumps and discharges high-pressure oil to the first circuit 22, and the high-pressure oil is supplied from the third circuit 29 to the discharge path 11 of the main hydraulic pump 10. You. At this time, the pressure of the second pump is set so that the pressure of the discharge passage 11 and the pressure of the first circuit 22 are equal (or the pressure of the first circuit 22 is slightly higher). Control the capacity of
  • the first pump motor 16 is of a variable displacement type, even if the capacity of the second pump motor 17 is increased as described above, the pressure of the first circuit 22 is discharged.
  • a small capacity signal is input from the controller 33 to the capacity control member 35, and the capacity of the first pump motor 16 is reduced to increase the pressure. Make it possible to discharge oil.
  • the first pump / motor 16 is of a variable displacement type in order to enlarge the pressure conversion area, and when the pressure conversion area is small, the first pump / motor 16 is of a fixed displacement type. It is good.
  • a backflow prevention valve 36 may be provided in the third circuit 29 to surely prevent the backflow to 2.
  • the backflow from the discharge passage 11 of the main hydraulic pump 10 to the second circuit 25 is prevented. Prevent surely. In other words, the backflow from the discharge path 11 to the second circuit 25 can be prevented by the sequence valve 28, but the backflow is reliably prevented even if there is internal pressure oil leakage or malfunction of the sequence valve 28.
  • a second check valve 37 will be installed in the system.
  • the maximum internal pressure of the pressure accumulator 27 is regulated by providing a safety valve 38 between the pressure accumulator 26 and the pressure accumulator 27.
  • a safety valve 38 between the pressure accumulator 26 and the pressure accumulator 27.
  • the sequence valve 28 is of a variable set pressure type.
  • an electromagnetic variable set pressure type sequence valve 28 having a set pressure proportional to the amount of current supplied to the solenoid 28a is used.
  • a third pressure sensor 39 for detecting the pressure of the second circuit 25 is provided, and the detected pressure is input to the controller 33.
  • the pressure is stored in the pressure accumulator 27 in the same manner as in the first embodiment. At this time, the amount of electricity to the solenoid 28 of the sequence valve 28 is increased to increase the set pressure.
  • the high-pressure oil stored in the pressure accumulator 27 flows from the second circuit 25 into the main boat 24 of the second pump motor 17, and the second pump * motor Since 17 acts as a motor, the first pump 'motor 16' is driven.
  • the second pump / motor 16 operates as a pump to discharge high-pressure oil to the first circuit 22, and the high-pressure oil is supplied from the third circuit 29 to the discharge path 11 of the main hydraulic pump 10. .
  • the pressure is supplied to the discharge path 11 of the main hydraulic pump 10 through the pressure converter 18 and the third circuit 29 for reuse.
  • the energization of the solenoid 23 b of the recovery valve 23 is stopped to the closed position a, and the energization of the solenoid 26 b of the accumulation valve 26 is set to the open position b to regenerate.
  • Valve 30 is in closed position a. Reduce the amount of electricity to the solenoid 28a of the sequence valve 28 to lower the set pressure.
  • the first circuit 22 connected to the main port 21 of the first pump module 16 has a recovery valve 23 and a regeneration valve.
  • the controller 33 detects the internal pressure of the accumulator 27 (hereinafter referred to as the storage pressure) P 1 detected by the third pressure sensor 39 and the main hydraulic pump 1 detected by the first pressure sensor 31.
  • a differential pressure P of the discharge pressure P 2 (load pressure) of 0 is calculated, and when this differential pressure ⁇ ⁇ is equal to or greater than the set differential pressure ⁇ ⁇ 1, it is determined to be the first operation, and the differential pressure ⁇ P is set.
  • the pressure difference is equal to or less than ⁇ 1, it is determined that the operation is the second operation.
  • the set differential pressure ⁇ ⁇ 1 is the horsepower loss due to the pressure transducer 18 and
  • the horsepower loss due to the pressure loss of the sequence valve 28 is a pressure almost equal, for example, about 20 kg Zcm 2 .
  • the controller 33 determines that the operation is the first operation, the recovery valve 23, the pressure storage valve 26, and the regeneration valve 30 are switched as described above, and the set pressure of the sequence valve 28 is increased. And
  • the controller 33 determines that the operation is the second operation, the controller 33 switches the recovery valve 23, the pressure accumulation valve 26, and the regeneration valve 30 as described above, and sets the sequence valve 28. The pressure is low.
  • the first operation is performed. That is, the stored high-pressure oil is supplied to the discharge path 11 of the main hydraulic pump 10 via the pressure converter 18 and the third circuit 29.
  • the discharge pressure P 2 since the discharge pressure P 2 is low, the pressure supplied to the discharge path 11 may be low, and the swash plate angle of the second pump / motor 17 of the pressure transducer 18 is reduced to increase the speed. By rotating, the swash plate angle of the first pump / motor 16 is increased to decrease the discharge pressure, and the discharge amount is increased to supply a large amount of low-pressure hydraulic pressure to the discharge path 11.
  • the stored high-pressure oil is supplied to the sequence valve 2. After that, it is supplied to the discharge path 11 of the main hydraulic pump 10.
  • the recovery valve 23 is set to the open position b, the regeneration valve 30 and the pressure storage valve 26 are set to the closed position a, and the set pressure of the sequence valve 28 is set to a low pressure.
  • the return pressure oil that has flowed into the first circuit 22 is boosted by the pressure transducer 18 as described above and discharged to the second circuit 25, and the pressure of the sequence valve 28 is increased.
  • the pressure is equal to or higher than the cut pressure, the pressure is directly supplied to the discharge path 11.
  • the pressure of the return pressure oil can be reduced by the pressure transducer 18 and supplied to the discharge path 11, so that the pressure of the return pressure oil is lower than the discharge pressure. Even if it is low, it can be reused immediately without storing.
  • the recovery valve 23 and the regeneration valve 30 are set to the open position b, the pressure storage valve 26 is set to the closed position a, and the set pressure of the sequence valve 28 is set to a high pressure.
  • the return pressure oil flowing into the first circuit 22 is discharged to the second circuit 25 in the same manner as in the first operation, but the set pressure of the sequence valve 28 is high. Therefore, the return pressure oil flowing into the first circuit 22 is supplied to the discharge path 11 of the main pressure oil pump 10 from the regeneration valve 30 and the third circuit 29.
  • the return pressure oil can be directly supplied without passing through the pressure transducer 18, so that the return pressure oil can be efficiently returned when the pressure of the return pressure oil is higher than the discharge pressure.
  • Pressure oil can be reused.
  • the controller 33 determines the magnitude of the discharge pressure P 2 from the first pressure sensor 31 and the pressure P 3 of the return pressure oil from the second pressure sensor 32, and determines P 3. When P2, the first operation is selected, and when P3> P2, the second operation is selected.
  • the controller 33 switches the collection valve 23, the pressure storage valve 26, and the regeneration valve 30 in the same manner as described above, and lowers the set pressure of the sequence valve 28 to a low pressure.
  • the controller 33 switches the recovery valve 23, the pressure accumulation valve 26, and the regeneration valve 30 in the same manner as described above, and sets the sequence valve 28. Set the set pressure to high pressure.

Abstract

Ce système consiste à récupérer et réutiliser l'énergie d'une huile hydraulique de retour d'un actionneur en tant qu'énergie destinée à faire fonctionner d'autres actionneurs. On a relié mécaniquement un premier (16) et un second (17) moteur/pompe, afin de former un convertisseur de pression (18), on a raccordé sur le premier moteur/pompe (16) un premier circuit (22) auquel est fournie l'huile hydraulique de retour, et sur le second moteur/pompe (17) un second circuit (25) pourvu d'un accumulateur (27). On a relié le premier circuit (22) à une conduite de retour d'une pompe hydraulique principale (10) au moyen d'un troisième circuit (29), la pression de l'huile hydraulique haute pression étant stockée à l'aide de l'énergie de cette huile de retour. On envoie l'huile hydraulique haute pression vers la conduite de retour (11) au moyen de la pression de cette huile que l'on réutilise ensuite.
PCT/JP1997/003416 1996-09-25 1997-09-25 Systeme de recuperation/reutilisation d'huile hydraulique WO1998013603A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP51549998A JP3362258B2 (ja) 1996-09-25 1997-09-25 圧油回収再利用システム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8/252999 1996-09-25
JP25299996 1996-09-25

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US09230671 A-371-Of-International 1999-01-29
US09/880,552 Continuation-In-Part US6378301B2 (en) 1996-09-25 2001-06-13 Pressurized fluid recovery/reutilization system

Publications (1)

Publication Number Publication Date
WO1998013603A1 true WO1998013603A1 (fr) 1998-04-02

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Application Number Title Priority Date Filing Date
PCT/JP1997/003416 WO1998013603A1 (fr) 1996-09-25 1997-09-25 Systeme de recuperation/reutilisation d'huile hydraulique

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Cited By (12)

* Cited by examiner, † Cited by third party
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EP1186783A2 (fr) * 2000-09-08 2002-03-13 Husco International, Inc. Système hydraulique avec régéneration d'énergie traversée
US6378301B2 (en) 1996-09-25 2002-04-30 Komatsu Ltd. Pressurized fluid recovery/reutilization system
EP1286057A1 (fr) * 2001-02-19 2003-02-26 Hitachi Construction Machinery Co., Ltd. Circuit hydraulique pour materiel de travaux publics
AT500237A1 (de) * 2001-05-28 2005-11-15 Walterscheid Gmbh Gkn Hydraulisches hubwerk für eine anbauvorrichtung
WO2008007484A1 (fr) * 2006-07-10 2008-01-17 Caterpillar Japan Ltd. Système de commande hydraulique pour machine de chantier
EP2351937A1 (fr) * 2008-10-22 2011-08-03 Caterpillar SARL Système de commande hydraulique pour machine de chantier
CN102635143A (zh) * 2012-05-04 2012-08-15 山东理工大学 装载机节能液压控制系统及控制方法
EP2694747A1 (fr) * 2011-04-08 2014-02-12 Volvo Construction Equipment AB Agencement pour charger un accumulateur
JP2015031364A (ja) * 2013-08-05 2015-02-16 住友重機械工業株式会社 ショベル
JP2015031365A (ja) * 2013-08-05 2015-02-16 住友重機械工業株式会社 ショベル
JP2016507706A (ja) * 2012-12-19 2016-03-10 イートン コーポレーションＥａｔｏｎ Ｃｏｒｐｏｒａｔｉｏｎ エネルギを回収し、油圧システムにかかる負荷を平準化するための油圧システム用制御システム及び方法
WO2024002941A1 (fr) * 2022-06-28 2024-01-04 Robert Bosch Gmbh Entraînement hydraulique et procédé permettant d'abaisser de manière régénérative un élément d'une machine

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US7444809B2 (en) * 2006-01-30 2008-11-04 Caterpillar Inc. Hydraulic regeneration system
CN102241379B (zh) * 2010-05-13 2014-05-07 济南谨恒节能技术有限公司 节能型行走式液压搬运机械
CN105805065B (zh) * 2015-12-15 2018-05-15 重庆川仪自动化股份有限公司 变速的esd阀门电液执行机构

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6378301B2 (en) 1996-09-25 2002-04-30 Komatsu Ltd. Pressurized fluid recovery/reutilization system
EP1186783A3 (fr) * 2000-09-08 2003-06-11 Husco International, Inc. Système hydraulique avec régéneration d'énergie traversée
EP1186783A2 (fr) * 2000-09-08 2002-03-13 Husco International, Inc. Système hydraulique avec régéneration d'énergie traversée
EP1286057A1 (fr) * 2001-02-19 2003-02-26 Hitachi Construction Machinery Co., Ltd. Circuit hydraulique pour materiel de travaux publics
EP1286057A4 (fr) * 2001-02-19 2009-08-19 Hitachi Construction Machinery Circuit hydraulique pour materiel de travaux publics
AT500237A1 (de) * 2001-05-28 2005-11-15 Walterscheid Gmbh Gkn Hydraulisches hubwerk für eine anbauvorrichtung
AT500237B1 (de) * 2001-05-28 2006-05-15 Walterscheid Gmbh Gkn Hydraulisches hubwerk für eine anbauvorrichtung
WO2008007484A1 (fr) * 2006-07-10 2008-01-17 Caterpillar Japan Ltd. Système de commande hydraulique pour machine de chantier
CN101438064B (zh) * 2006-07-10 2012-05-02 卡特彼勒Sarl公司 作业机械中的液压控制系统
EP2351937A4 (fr) * 2008-10-22 2014-02-26 Caterpillar Sarl Système de commande hydraulique pour machine de chantier
EP2351937A1 (fr) * 2008-10-22 2011-08-03 Caterpillar SARL Système de commande hydraulique pour machine de chantier
US8689550B2 (en) 2008-10-22 2014-04-08 Caterpillar Sarl Hydraulic control system in working machine
EP2694747A4 (fr) * 2011-04-08 2014-12-17 Volvo Constr Equip Ab Agencement pour charger un accumulateur
EP2694747A1 (fr) * 2011-04-08 2014-02-12 Volvo Construction Equipment AB Agencement pour charger un accumulateur
US10018207B2 (en) 2011-04-08 2018-07-10 Volvo Construction Equipment Ab Arrangement for charging an accumulator
CN102635143B (zh) * 2012-05-04 2014-06-11 山东理工大学 装载机节能液压控制系统及控制方法
CN102635143A (zh) * 2012-05-04 2012-08-15 山东理工大学 装载机节能液压控制系统及控制方法
JP2016507706A (ja) * 2012-12-19 2016-03-10 イートン コーポレーションＥａｔｏｎ Ｃｏｒｐｏｒａｔｉｏｎ エネルギを回収し、油圧システムにかかる負荷を平準化するための油圧システム用制御システム及び方法
JP2015031364A (ja) * 2013-08-05 2015-02-16 住友重機械工業株式会社 ショベル
JP2015031365A (ja) * 2013-08-05 2015-02-16 住友重機械工業株式会社 ショベル
WO2024002941A1 (fr) * 2022-06-28 2024-01-04 Robert Bosch Gmbh Entraînement hydraulique et procédé permettant d'abaisser de manière régénérative un élément d'une machine

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