WO2015019594A1 - 建設機械用エネルギ回生装置 - Google Patents

建設機械用エネルギ回生装置 Download PDF

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Publication number
WO2015019594A1
WO2015019594A1 PCT/JP2014/004063 JP2014004063W WO2015019594A1 WO 2015019594 A1 WO2015019594 A1 WO 2015019594A1 JP 2014004063 W JP2014004063 W JP 2014004063W WO 2015019594 A1 WO2015019594 A1 WO 2015019594A1
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WO
WIPO (PCT)
Prior art keywords
movable weight
energy
pressure
weight
boom
Prior art date
Application number
PCT/JP2014/004063
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
哲弘 近藤
藤山　和人
Original Assignee
川崎重工業株式会社
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 川崎重工業株式会社 filed Critical 川崎重工業株式会社
Priority to GB1519561.3A priority Critical patent/GB2531946A/en
Priority to CN201480026051.XA priority patent/CN105164347B/zh
Priority to JP2015530698A priority patent/JP6285935B2/ja
Priority to US14/895,081 priority patent/US20160122980A1/en
Publication of WO2015019594A1 publication Critical patent/WO2015019594A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means
    • 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
    • E02F9/18—Counterweights
    • 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
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
    • E02F3/32—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes

Definitions

  • the present invention relates to an energy regeneration device for a construction machine provided in a construction machine including an operating part including a boom, a revolving body, or a traveling body driven by a driving unit.
  • the fuel consumption can be reduced.
  • the conventional hydraulic excavator requires a capacitor and an inverter as equipment for accumulating regenerative electric power and using the accumulated regenerative electric power at the time of turning of the revolving structure.
  • the possibility of failure is high, the bulk is increased, and the weight is increased.
  • the mechanical energy of the revolving structure is converted into electrical energy, accumulated once, and then converted into mechanical energy again, there is a problem that the overall energy regeneration rate is not so high.
  • the conventional hydraulic excavator cannot regenerate potential energy for operations other than turning (boom lowering, arm pulling, or bucket pulling).
  • the present invention has been made in order to solve the above-described problems.
  • the cost is low, the cost is low, the breakdown is low, and the weight is not bulky. It aims at providing the energy regeneration apparatus for construction machines which can suppress an increase, and a construction machine provided with the same.
  • a first operating unit including a boom, a turning body, or a traveling body
  • a second operating unit including an arm, a bucket, or an engine assisting hydraulic motor
  • the movable weight provided in the construction machine and movable in the vertical direction and the energy when the boom, arm, or bucket moves in the direction of gravity, or the swivel body or the traveling Hydraulic force for force transmission that moves the movable weight upward by energy when the body brakes, and uses the positional energy of the movable weight as energy for driving the first operating portion or the second operating portion.
  • a circuit a circuit.
  • the movable weight is moved upward (including swinging) by the energy when the boom or the like moves in the direction of gravity or when the swinging body or the like is braked. be able to.
  • the potential energy of the boom or the like and the kinetic energy of the swivel body or the like can be accumulated as the potential energy of the movable weight.
  • the boom and swivel body can be driven using the potential energy of this movable weight.
  • the potential energy of the boom, etc. and the kinetic energy of the swivel body, etc. can be stored as the potential energy of the movable weight, which can be used, so that the fuel consumption of the construction machine can be reduced compared to the conventional case. It is.
  • the communication path is provided in the communication path, the communication path that connects the circuit of the first operation part or the second operation part and the circuit of the movable weight to each other, and the communication path
  • the switching valve for switching the direction of the flow of the working liquid in the communication path is provided on the communication path that connects the circuit of the first operation unit or the second operation unit and the circuit of the movable weight to each other.
  • the potential energy or kinetic energy of the first operating part or the second operating part can be regenerated and used to drive the first operating part or the second operating part.
  • a part of the movable weight and the force transmission hydraulic circuit has a function as a counterweight of the construction machine, and the movable weight and the force transmission liquid
  • the total mass of a part of the pressure circuit may be substantially the same as the mass of the counterweight required for the construction machine.
  • the entire mass of the hydraulic excavator can be manufactured so as not to increase more than the overall mass of the hydraulic excavator not provided with the energy regeneration device. It is. Therefore, it is possible to prevent an increase in power and an increase in fuel consumption for operating the turning body or the traveling body, which is the operating portion, and as a result, energy can be regenerated and used more effectively.
  • the movable weight is preferably supported by a predetermined fulcrum portion and provided so as to be swingable in a vertical direction by a hydraulic cylinder around the fulcrum portion.
  • the movable weight is provided so as to be swingable in the vertical direction around the fulcrum part, and the distance between the connecting part where the hydraulic cylinder is connected to the movable weight and the fulcrum part is set appropriately.
  • the moving distance of the center of gravity of the movable weight can be made relatively large, and the stroke of the hydraulic cylinder for swinging the movable weight by a predetermined angle in the vertical direction is set to be relatively small. can do.
  • the movable weight may be provided so as to be movable in a linear direction.
  • the movable weight is supported by a predetermined fulcrum portion and is provided so as to be swingable in the vertical direction by the hydraulic cylinder around the fulcrum portion.
  • the lift cylinder and the assist cylinder, and the distance between the connecting portion where the lift cylinder and the assist cylinder are coupled to the movable weight and the fulcrum portion is the distance of the lift cylinder.
  • the force transmission hydraulic circuit is set larger than the distance of the assist cylinder, and the force transmission hydraulic circuit operates the lift cylinder when the boom moves in the direction of gravity or when the swinging body or the traveling body brakes.
  • the distance of the lift cylinder is set larger than the distance of the assist cylinder. For this reason, the pressure discharged from the assist cylinder when the movable weight is lowered can be made higher than the pressure supplied to the lift cylinder to raise the movable weight. Therefore, the pressure of the working liquid for driving the first working part or the second working part can be increased, and the pressure range using the potential energy of the movable weight can be increased.
  • an electromagnetic pilot valve that supplies a pilot pressure liquid to the pilot port of the switching valve, and a pressure of the working liquid supplied to the first operating part or the second operating part
  • a control valve for controlling the flow rate
  • a remote control valve for supplying pilot pressure liquid to the pilot port of the control valve, and measuring the supply pressure and discharge pressure of the working liquid in the first operating part or the second operating part
  • a pressure sensor for measuring the output pressure of the remote control valve and generating each pressure signal, and a control device to which each pressure signal is input, wherein the electromagnetic pilot valve is applied to the electromagnetic pilot valve based on each pressure signal.
  • a control device that transmits a command signal.
  • the control device opens the switching valve via the electromagnetic pilot valve. Since the control is performed, the potential energy or kinetic energy of the boom or the revolving body can be efficiently regenerated as the potential energy of the movable weight.
  • the kinetic energy based on the positional energy and inertial force of the operating part is regenerated and used to drive the operating part.
  • the fuel consumption can be reduced as compared with the conventional case.
  • operation part etc. can be made unnecessary, the cost for that is required. It is inexpensive and inexpensive, has few failures, is not bulky, and can suppress an increase in the weight of the construction machine.
  • FIG. 4 is a diagram showing a state of a boom raising operation in the hydraulic circuit of the excavator shown in FIG. 3.
  • FIG. 4 is a diagram showing a state in which energy is regenerated during a boom lowering operation in the hydraulic circuit of the hydraulic excavator shown in FIG. 3.
  • FIG. 4 is a diagram showing a state in which regenerative energy is used for pushing an arm in the hydraulic circuit of the hydraulic excavator shown in FIG. 3. It is a figure which shows the hydraulic circuit of the hydraulic shovel concerning 2nd Embodiment, and shows the state which utilizes regenerative energy for pushing operation
  • an operation unit including a boom 12, a revolving unit 13, and a traveling unit 14 shown in FIGS. 1 and 2 is discharged from a hydraulic pump 28 (drive unit) shown in FIG.
  • a movable weight 16 provided in a construction machine such as a hydraulic excavator 15 driven by liquid and movable in the vertical direction, and a force transmission hydraulic circuit 17A (see FIG. 3) are provided.
  • the boom 12, the revolving body 13, or the traveling body 14 is referred to as a first operating portion
  • the arm 19, the bucket 20, or the engine assisting hydraulic motor 52 (see FIG. 9) is referred to as a second operating portion.
  • the force transmission hydraulic circuit 17A shown in FIG. 3 is used when, for example, the boom 12, the arm 19, or the bucket 20 is moved in the direction of gravity, or when the revolving body 13 or the traveling body 14 is braked.
  • a revolving structure 13 is placed on a traveling body 14 via a revolving mechanism 18 so as to be capable of revolving.
  • the boom 12 is attached to the revolving body 13 at the front center portion thereof so as to be able to be raised and lowered.
  • an arm 19 is attached to the tip of the boom 12 so as to be rotatable in a vertical plane
  • a bucket 20 is attached to the tip of the arm 19 so as to be rotatable in a vertical plane.
  • FIG. 2 is a schematic diagram showing the movable weight 16 provided at the rear portion of the revolving structure 13 of the excavator 15 in an exaggerated manner.
  • the movable weight 16 serves to store the gravity of the boom 12 or the like as potential energy and to function as a counterweight of the excavator 15.
  • a part of the movable weight 16 and the force transmission hydraulic circuit 17A functions as a counterweight of the hydraulic excavator 15, and the total mass of the movable weight 16 and a part of the force transmission hydraulic circuit 17A is The mass of the counterweight required for the hydraulic excavator 15 is set to be approximately the same.
  • the movable weight 16 shown in FIG. 2 has the same shape and material as the conventional counterweight, and is provided at the rear portion of the swing body 13 and on the opposite side of the boom 12 side with respect to the swing mechanism 18. Yes.
  • the movable weight 16 is provided so as to be movable in the vertical direction along the guide portion 25, and a weight hydraulic cylinder 21 is provided below the movable weight 16.
  • the weight hydraulic cylinder 21 supports the movable weight 16 so as to be movable in a vertical linear direction, and is provided between the lower portion of the movable weight 16 and the frame portion 13 a of the revolving body 13.
  • the weight hydraulic cylinder 21 is attached with the base end portion of the cylinder portion 21 a fixed to the frame portion 13 a of the swing body 13, and the distal end portion of the piston rod 21 b connects the lower portion of the movable weight 16 and the connecting portion 26. Via each other so as to be swingable.
  • FIG. 3 shows a hydraulic circuit 27 including a hydraulic pressure circuit 17A for force transmission of the hydraulic excavator 15.
  • the hydraulic circuit 27 has a communication path 22 (22a, 22b, 22c) and a weight switching valve 24. ing.
  • circuits other than the boom 12 and the arm 19 are omitted.
  • the communication path 22 includes a circuit for the first and second operating parts including a boom communication path 53 (53a, 53b) and an arm communication path 54 (54a, 54b) and a movable weight communication path 55 (55a, 55b). ) To communicate with each other.
  • the weight switching valve 24 is connected to the communication path 22 and is used to switch the flow direction of the working liquid in the communication path 22.
  • the weight switching valve 24 When the boom 12, arm 19, or bucket 20 moves in the direction of gravity, or when the swinging body 13 or the traveling body 14 is braked, the weight switching valve 24 is in the first position. By switching to the (b) side, the working liquid can move upward through the communication passage 22 and the weight switching valve 24.
  • the weight switching valve 24 When the movable weight 16 moves in the direction of gravity, the weight switching valve 24 is switched to the second position (c) side so that the working liquid is communicated with the communication path 22 and the weight.
  • the first operating part including the boom 12 or the second operating part including the arm 19 can be driven through the switching valve 24.
  • the ports A and B of the weight switching valve 24 shown in FIG. 3 are connected to the head side port and rod side port of the weight hydraulic cylinder 21 via the movable weight communication passages 55a and 55b.
  • the ports B and C of the weight switching valve 24 are connected to each other.
  • the port T of the weight switching valve 24 is connected to the tank 32, and the port P is connected to the discharge port of the hydraulic pump 28 via the communication path 22.
  • the port D is connected to the arm communication path 54a through the communication path 22a.
  • the communication passage 22a is provided with a check valve.
  • the hydraulic circuit 27 shown in FIG. 3 includes a control valve for the first operating part including the boom 12 and a control valve for the second operating part including the arm 19. These control valves are for controlling the pressure and flow rate of the working liquid supplied to the first working part or the second working part.
  • FIG. 3 further shows an arm control valve 56 and a boom control valve 57.
  • the arm control valve 56 is for controlling the pressure and flow rate of the working liquid supplied to the arm hydraulic cylinder 37.
  • the ports A and B of the arm control valve 56 are connected to the two ports (rod side and head side) of the arm hydraulic cylinder 37 via the arm communication passages 54a and 54b.
  • the port T of the arm control valve 56 is connected to the tank 32 via the tank communication path 60, and the port P of the arm control valve 56 is connected to the discharge port of the hydraulic pump 28 and the pump communication path 61. Connected.
  • the boom control valve 57 is for controlling the pressure and flow rate of the working liquid supplied to the boom hydraulic cylinder 39.
  • the ports A and B of the boom control valve 57 are connected to two ports (rod side and head side) of the boom hydraulic cylinder 39 via boom communication paths 53a and 53b.
  • the port T of the boom control valve 57 is connected to the tank 32 via the tank communication path 62, and the port P of the boom control valve 57 is connected via the discharge port of the hydraulic pump 28 and the pump communication path 63. Connected.
  • the remote control valve (hereinafter simply referred to as “remote control valve”) shown in FIG. 3 is for supplying pilot pressure fluid to the pilot port of each control valve.
  • FIG. 3 shows an arm remote control valve 64 and a boom remote control valve 65.
  • the arm remote control valve 64 is operated by the operator to supply pilot pressure liquid to the pilot ports X and Y of the arm control valve 56 via the communication passages 64b and 64a.
  • the boom remote control valve 65 is operated by the operator to supply pilot pressure liquid to the pilot ports X and Y of the boom control valve 57 via the communication paths 65b and 65a.
  • the first to tenth pressure sensors PS1 to PS10 measure the supply pressure and discharge pressure of the working liquid in the first actuating part or the second actuating part, further measure the output pressure of the remote control valve, and electrically output each pressure signal. It is for generating as a signal.
  • FIG. 3 shows the first to sixth pressure sensors PS1 to PS6.
  • the first and second pressure sensors PS1 and PS2 are for measuring the output pressure appearing in the communication passages 65a and 65b of the boom remote control valve 65 and generating each pressure signal as an electrical signal.
  • the third and fourth pressure sensors PS3 and PS4 are for measuring the output pressure appearing in the communication passages 64a and 64b of the arm remote control valve 64 and generating each pressure signal as an electrical signal.
  • the fifth and sixth pressure sensors PS5 and PS6 are for measuring the output pressure appearing in the boom communication passages 53b and 53a connected to the boom hydraulic cylinder 39 and generating each pressure signal as an electric signal.
  • the hydraulic circuit 27 shown in FIG. 3 further includes a control circuit 70 shown in FIG.
  • the control circuit 70 shown in FIG. 4 includes first and second electromagnetic pilot valves 71 and 72 and a control device 73.
  • the first electromagnetic pilot valve 71 shown in FIG. 4 is for supplying pilot pressure fluid to the pilot port Pia of the weight switching valve 24 shown in FIG. 3 according to the current flowing through the first signal line 71a.
  • the pressure source of the pilot pressure fluid is based on the fluid pressure discharged from the control hydraulic pump 74.
  • the second electromagnetic pilot valve 72 is for supplying pilot pressure fluid to the pilot port Pib of the weight switching valve 24 shown in FIG. 3 according to the current flowing through the second signal line 72a.
  • the pressure source of the pilot pressure fluid is based on the fluid pressure discharged from the control hydraulic pump 74.
  • the control device 73 is electrically inputted with each pressure electric signal output from the first to tenth pressure sensors PS1 to PS10, and instructs the first and second electromagnetic pilot valves 71 and 72 to command electric power based on each pressure electric signal. It is for transmitting a signal.
  • FIG. 5 is a diagram illustrating a state of the boom 12 raising operation in the hydraulic circuit 27 and the control circuit 70 of the excavator 15 illustrated in FIGS. 3 and 4.
  • the spool of the boom control valve 57 is switched to the position (c), and the pressure oil discharged from the hydraulic pump 28 is As indicated by a thick solid line, the boom 12 is supplied to the boom hydraulic cylinder 39, and the boom 12 can be raised to a desired height.
  • FIG. 6 is a diagram illustrating a state in which energy is regenerated during the lowering operation of the boom 12 in the hydraulic circuit 27 and the control circuit 70 illustrated in FIGS. 3 and 4.
  • the spool of the boom control valve 57 is switched to the position (b), and the pressure oil discharged from the hydraulic pump 28 is As indicated by a thick solid line, the boom 12 is supplied to the boom hydraulic cylinder 39, and the boom 12 can be lowered to a desired height.
  • the pressure oil discharged from the boom hydraulic cylinder 39 is supplied to the weight switching valve 24.
  • control device 73 is electrically inputted with each pressure electric signal output from the fifth and sixth pressure sensors PS5 and PS6, and transmits a command electric signal to the second electromagnetic pilot valve 72 based on each pressure electric signal.
  • the spool of the weight switching valve 24 is switched to the position (B), and the pressure oil discharged from the boom hydraulic cylinder 39 passes through the weight switching valve 24 as shown by a thick dashed line.
  • the movable weight 16 can be raised by being supplied to the hydraulic cylinder 21.
  • the control is performed based on the operation amount of the boom remote control valve 65 for operating the boom 12 and the supply / discharge pressure of the working liquid in the boom 12 (pressure electric signals of the fifth and sixth pressure sensors PS5 and PS6). Since the device 73 controls the opening of the weight switching valve 24 via the second electromagnetic pilot valve 72, the potential energy of the boom 12 can be efficiently regenerated as the potential energy of the movable weight 16.
  • FIG. 7 is a diagram showing a state in which the regenerative energy is used for the pushing operation of the arm 19 in the hydraulic circuit 27 and the control circuit 70 shown in FIGS. 3 and 4.
  • the spool of the arm control valve 56 is switched to the position (b), and the pressure oil discharged from the hydraulic pump 28 is As indicated by a thick solid line and a thick dashed line, the arm 19 is supplied to the arm hydraulic cylinder 37 and can swing the arm 19 in the pushing direction.
  • the control device 73 is electrically inputted with each pressure electric signal output from a pressure sensor (not shown) connected to the arm hydraulic cylinder 37, and command electric power is supplied to the first electromagnetic pilot valve 71 based on each pressure electric signal. Send a signal.
  • the spool of the weight switching valve 24 is switched to the position (c), and the pressure oil discharged from the weight hydraulic cylinder 21 passes through the weight switching valve 24 and is used for the arm as shown by a thick dashed line.
  • the arm 19 Supplied to the hydraulic cylinder 37, the arm 19 can be swung in the pushing direction. In this way, the regenerative energy can be used for the pushing operation of the arm 19.
  • the movable weight 16 can be moved upward by the energy when the boom 12 moves in the direction of gravity (during the lowering operation). Thereby, the potential energy of the boom 12 can be accumulated as the potential energy of the movable weight 16.
  • the arm 19 can be driven in the pushing direction by using the potential energy of the movable weight 16.
  • the potential energy of the boom 12 can be stored as the potential energy of the movable weight 16 and used, it is possible to reduce the fuel consumption of the construction machine as compared with the conventional case.
  • the movable weight 16 has a function as a counterweight of a construction machine such as a hydraulic excavator 15, and the movable weight 16 and a force transmission hydraulic circuit 17A (third and third described later).
  • the total mass of a part of 17B and 17C) is substantially the same as the mass of the counterweight required for the construction machine.
  • the energy regeneration device 11 is provided in the hydraulic excavator 15, the overall mass of the hydraulic excavator 15 is not increased more than the overall mass of the hydraulic excavator 15 in which the energy regeneration device 11 is not provided. It is possible to produce. Accordingly, it is possible to prevent an increase in power and an increase in fuel consumption for operating the swing body 13 or the traveling body 14 that are the operating parts, and as a result, energy can be regenerated and used more effectively. .
  • the movable weight 16 is provided so as to be movable in the linear direction. In this way, it is possible to provide a low-priced energy recovery device 11 for a construction machine that is simple in structure and has few failures.
  • FIG. 8 shows a hydraulic circuit according to a second embodiment of the present invention, in which regenerative energy is used to drive the bucket 20.
  • the bucket control valve 58 is for controlling the pressure and flow rate of the working liquid supplied to the bucket hydraulic cylinder 38.
  • the bucket control valve 58 is connected to the bucket hydraulic cylinder 38, the tank 32, and the hydraulic pump 28 in the same manner as described above.
  • bucket remote control valve 66 is connected to the pilot ports X and Y of the bucket control valve 58 via communication passages 66b and 66a.
  • the seventh and eighth pressure sensors PS7 and PS8 shown in FIG. 8 measure the output pressure appearing in the communication passages 66a and 66b of the bucket remote control valve 66, and generate each pressure signal as an electric signal. belongs to.
  • FIG. 8 is a diagram showing a state in which regenerative energy is used for pushing the bucket 20 in the hydraulic circuit 27 and the control circuit 70 shown in FIGS. 3 and 4.
  • the difference between the state shown in FIG. 8 and the state shown in FIG. 7 is that in the state shown in FIG. 7, the regenerative energy is used for the pushing operation of the arm 19, whereas in the state shown in FIG. The regenerative energy is used for pushing the bucket 20.
  • control device 73 operates in the same manner as shown in FIG. 7, and the pressure oil discharged from the weight hydraulic cylinder 21 passes through the weight switching valve 24 as shown by a thick one-dot chain line, and then passes through the bucket. It is supplied to the hydraulic cylinder 38 and can swing the bucket 20 in the pushing direction.
  • FIG. 9 shows a hydraulic circuit 75 of the third embodiment, which includes a hydraulic pressure circuit 17B for force transmission of the excavator 15, and a communication path 22a for the engine assist hydraulic motor 52 is provided in the hydraulic circuit 27 shown in FIG. It is added.
  • FIG. 9 is a diagram showing a state where the engine assist hydraulic motor 52 is driven by the regenerative energy and the regenerative energy is used for the pushing operation of the arm 19.
  • the spool of the arm control valve 56 is switched to the position (b), and the pressure oil discharged from the hydraulic pump 28 is As indicated by a thick solid line, the arm 19 is supplied to the arm hydraulic cylinder 37 and can swing the arm 19 in the pushing direction.
  • the control device 73 is electrically inputted with each pressure electric signal output from a pressure sensor (not shown) connected to the arm hydraulic cylinder 37, and command electric power is supplied to the first electromagnetic pilot valve 71 based on each pressure electric signal. Send a signal.
  • the spool of the weight switching valve 24 is switched to the position (c), and the pressure oil discharged from the weight hydraulic cylinder 21 passes through the weight switching valve 24 and the communication passage 22a as indicated by a thick dashed line. And is supplied to the engine assist hydraulic motor 52. Accordingly, when the assist hydraulic motor 52 rotates, it is possible to assist the drive of the hydraulic pump 28 connected to the rotating shaft of the assist hydraulic motor 52.
  • the regenerative energy (the potential energy of the movable weight 16) can be used for the pushing operation of the arm 19, the fuel consumption of the construction machine can be reduced as compared with the conventional case.
  • the port D of the weight switching valve 24 is connected to the oil inlet of the assist hydraulic motor 52 via the communication path 22a.
  • FIG. 10 shows a hydraulic circuit 76 according to the fourth embodiment, which includes a hydraulic pressure circuit 17C for transmitting the force of the excavator 15, and in the hydraulic circuit 27 shown in FIG. 3, instead of the boom communication paths 53a and 53b, a swing is performed.
  • check communication valves 59a and 69b are added, and check valves 78a and 78b for guiding oil flowing out from the swing communication passages 69a and 69b in one direction are additionally shown.
  • the swing body control valve 59 is for controlling the pressure and flow rate of the working liquid supplied to the swing body hydraulic motor 36.
  • the swing body control valve 59 is connected to the swing body hydraulic motor 36, the tank 32, and the hydraulic pump 28 in the same manner as described above.
  • the revolving body remote control valve 67 is also connected to the pilot ports X and Y of the revolving body control valve 59 via communication passages 67b and 67a.
  • FIG. 10 is a diagram showing a state in which energy is regenerated during braking of the revolving structure 13.
  • the spool of the revolving body control valve 59 is moved from the position (B) to the (A) side.
  • the outlet side of the swing body hydraulic motor 36 is blocked by the swing body control valve 59.
  • the control device 73 is electrically input with the respective pressure electrical signals output from the ninth and tenth pressure sensors PS9 and PS10, and the second electromagnetic pilot valve 72 is based on the respective pressure electrical signals.
  • a command electric signal is transmitted to.
  • the spool of the weight switching valve 24 is switched to the position (B), and the pressure oil discharged from the swivel hydraulic motor 36 passes through the weight switching valve 24 as shown by a thick dashed line. It is supplied to the hydraulic cylinder 21 and the movable weight 16 can be raised. At this time, the swing body hydraulic motor 36 sucks the pressure oil from the tank 32.
  • the control device. 73 controls the opening of the weight switching valve 24 via the second electromagnetic pilot valve 72, so that the kinetic energy of the swing body 13 can be efficiently regenerated as the potential energy of the movable weight 16.
  • the port P of the weight switching valve 24 is connected to the oil inlet / outlet of the swivel hydraulic motor 36 via the communication passage 36a.
  • Reference numeral 77 denotes a relief valve for controlling the discharge pressure of the hydraulic pump 28.
  • FIG. 11 is a diagram showing a state in which regenerative energy is used for the pushing operation of the arm 19 in the hydraulic circuit 76 of the excavator 15 shown in FIG.
  • the spool of the arm control valve 56 is switched to the position (b), and the pressure oil discharged from the hydraulic pump 28 is As shown by the thick solid line and the alternate long and short dash line, the arm 19 is supplied to the arm hydraulic cylinder 37 and can swing the arm 19 in the pushing direction.
  • the control device 73 is electrically inputted with each pressure electric signal output from a pressure sensor (not shown) connected to the arm hydraulic cylinder 37, and command electric power is supplied to the first electromagnetic pilot valve 71 based on each pressure electric signal. Send a signal.
  • the spool of the weight switching valve 24 is switched to the position (c), and the pressure oil discharged from the weight hydraulic cylinder 21 is changed to the weight switching valve 24 and the communication passage 22a, as shown by a thick dashed line.
  • the arm hydraulic cylinder 37 is supplied through 54a. As a result, the arm 19 can be swung in the pushing direction, and driving of the hydraulic pump 28 can be assisted.
  • the regenerative energy positional energy of the movable weight 16
  • the regenerative energy can be used for the pushing operation of the arm 19.
  • the movable weight 16 can be moved upward by the kinetic energy when the revolving structure 13 is braked. Thereby, the kinetic energy of the revolving structure 13 can be accumulated as the potential energy of the movable weight 16.
  • the arm 19 can be driven using the potential energy of the movable weight 16.
  • the kinetic energy of the revolving structure 13 can be stored as the potential energy of the movable weight 16 and used, it is possible to reduce the fuel consumption of the construction machine as compared with the prior art.
  • the construction machine energy regeneration device 43 of the second embodiment shown in FIG. 12 is different from the construction machine energy regeneration device 11 of the first embodiment shown in FIG. 2 in the first embodiment shown in FIG.
  • the movable weight 16 is supported by a predetermined fulcrum portion 44, whereas the movable weight 16 is provided so as to be movable in the vertical direction along the guide portion 25. This is provided so as to be swingable in the vertical direction around the fulcrum part 44.
  • the fulcrum portion 44 that supports the movable weight 16 shown in FIG. 12 is provided on the frame portion 13 a of the revolving structure 13.
  • a weight hydraulic cylinder 21 is provided below the movable weight 16.
  • the weight hydraulic cylinder 21 is provided so that the movable weight 16 can swing up and down around the fulcrum portion 44 when expanding and contracting.
  • the weight hydraulic cylinder 21 is provided between the lower portion of the movable weight 16 and the frame portion 13 a of the revolving structure 13. And the base end part of the cylinder part 21a is mutually connected to the frame part 13a of the revolving body 13 through the connecting part 45 so as to be swingable, and the tip part of the piston rod 21b is connected to the lower part of the movable weight 16 and the connecting part. 26 are connected to each other through a swingable motion.
  • the construction machine energy regeneration device 43 of the fifth embodiment shown in FIG. 12 has the following technical effects.
  • the stroke is small to a certain extent, so that stable operation can be obtained, and the hydraulic pressure when moving the movable weight 16 up and down can be increased to some extent. it can.
  • the movable weight 16 is provided so as to be swingable in the vertical direction around the fulcrum portion 44, and the distance L1 between the connecting portion 26 where the weight hydraulic cylinder 21 is connected to the movable weight 16 and the fulcrum portion 44 is short.
  • the moving distance in the vertical direction of the center of gravity of the movable weight 16 can be made relatively large, and the weight for swinging the movable weight 16 by a predetermined angle in the vertical direction
  • the stroke of the hydraulic cylinder 21 can be set to be relatively small, and the hydraulic pressure when moving the movable weight 16 up and down can be set to be somewhat high.
  • the second embodiment is the same as the first embodiment shown in FIG. 2, and the same parts are denoted by the same reference numerals, and the description thereof is omitted.
  • the construction machine energy regeneration device 48 of the sixth embodiment shown in FIG. 13 is different from the construction machine energy regeneration device 43 of the fifth embodiment shown in FIG. 12 in the fifth embodiment shown in FIG.
  • one weight hydraulic cylinder 21 is provided between the movable weight 16 and the frame portion 13 a of the swing body 13.
  • the movable weight 16 shown in FIG. 13 is supported by a predetermined fulcrum part 44 and provided so as to be swingable in the vertical direction around the fulcrum part 44, as in the fifth embodiment shown in FIG.
  • a lift hydraulic cylinder 21 and an assist hydraulic cylinder 49 are connected to the movable weight 16 through two connecting portions 26 and 50.
  • Connecting portions 26 and 50 are provided at the tip ends of the piston rods 21 b and 49 b of the lift and assist hydraulic cylinders 21 and 49, respectively.
  • the connecting portions 26 and 50 swing with respect to the movable weight 16. Connected freely.
  • the distances L2 and L3 between the two connecting portions 26 and 50 and the fulcrum portion 44 are set such that the distance L2 of the lift hydraulic cylinder 21 is larger than the distance L3 of the assist hydraulic cylinder 49.
  • G shown in FIG. 13 is the position of the center of gravity of the movable weight 16.
  • the force transmission hydraulic circuit guides the hydraulic oil to the weight hydraulic cylinder 21 to extend when the movable weight 16 is swung upward, so that the movable weight 16 moves downward.
  • the hydraulic oil is discharged from the assisting hydraulic cylinder 49 when it is swung, so that the shortening operation is performed.
  • the base end portions of the cylinder portions 21a and 49a of the lift and assist hydraulic cylinders 21 and 49 are connected to the frame portion 13a of the revolving structure 13 through the connecting portions 45 and 51, respectively. Yes.
  • the distance L2 of the weight hydraulic cylinder 21 with respect to the distances L2 and L3 between the connecting portions 26 and 50 connected to the movable weight 16 of the lift and assist hydraulic cylinders 21 and 49 and the fulcrum portion 44, respectively.
  • this is set to be larger than the distance L3 of the assist hydraulic cylinder 49, the assist when the movable weight 16 is lowered than the pressure of the pressure oil supplied to the lift hydraulic cylinder 21 to raise the movable weight 16 is provided.
  • the pressure of the pressure oil discharged from the use cylinder 49 can be increased. Therefore, the pressure of the working liquid for driving the first working part or the second working part can be increased, and the potential energy of the movable weight can be used effectively.
  • the second embodiment is the same as the first embodiment shown in FIG. 2, and a description thereof will be omitted.
  • the present invention is applied to the hydraulic excavator in the above embodiment, it can be applied to other construction machines such as a crane.
  • hydraulic oil was mentioned as an example as hydraulic fluid, you may use liquids other than hydraulic fluid.
  • 7, 8, 9 and 11 show examples in which the regenerated energy is used to drive the arm 19 or the bucket 20, but the regenerated energy can be used to drive the boom 12, for example. It is.
  • the energy recovery device for a construction machine according to the present invention and the construction machine including the same are not expensive, less expensive, and less bulky by eliminating the need for a capacitor and an inverter. It has an excellent effect of suppressing an increase in weight, and is suitable for application to such an energy regeneration device for construction machines and a construction machine including the same.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Component Parts Of Construction Machinery (AREA)
PCT/JP2014/004063 2013-08-05 2014-08-04 建設機械用エネルギ回生装置 WO2015019594A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB1519561.3A GB2531946A (en) 2013-08-05 2014-08-04 Energy regeneration device for construction machine
CN201480026051.XA CN105164347B (zh) 2013-08-05 2014-08-04 建筑机械用能量再生装置
JP2015530698A JP6285935B2 (ja) 2013-08-05 2014-08-04 建設機械用エネルギ回生装置
US14/895,081 US20160122980A1 (en) 2013-08-05 2014-08-04 Construction machine energy regeneration apparatus

Applications Claiming Priority (2)

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JP2013-162303 2013-08-05
JP2013162303 2013-08-05

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WO2015019594A1 true WO2015019594A1 (ja) 2015-02-12

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JP (1) JP6285935B2 (zh)
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JP2018065665A (ja) * 2016-10-20 2018-04-26 コベルコ建機株式会社 建設機械の制振装置
KR20190071107A (ko) * 2017-12-14 2019-06-24 한국오텍 주식회사 중장비 붐 무게 보상 장치

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JP6557472B2 (ja) * 2015-01-06 2019-08-07 川崎重工業株式会社 作業機械の駆動制御システム、それを備える作業機械、及びその駆動制御方法
US10890003B2 (en) * 2016-12-16 2021-01-12 International Chimney Corporation Liner removal apparatus
CN108180189B (zh) * 2018-02-26 2024-04-26 太原科技大学 一种电动清扫车带能量回收的储尘斗提升装置及方法
CN110409527A (zh) * 2019-06-28 2019-11-05 三一重机有限公司 一种动臂势能回收利用系统及挖掘机
CN110616758B (zh) * 2019-10-25 2024-03-19 董志强 挖掘机节能控制系统
DE102020113815A1 (de) 2020-05-22 2021-11-25 Marcel Hett Hydraulikmobilbagger
CN112555207A (zh) * 2020-12-01 2021-03-26 上海华兴数字科技有限公司 液压控制系统和机械设备

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JP2018065665A (ja) * 2016-10-20 2018-04-26 コベルコ建機株式会社 建設機械の制振装置
KR20190071107A (ko) * 2017-12-14 2019-06-24 한국오텍 주식회사 중장비 붐 무게 보상 장치
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US20160122980A1 (en) 2016-05-05
JP6285935B2 (ja) 2018-02-28
JPWO2015019594A1 (ja) 2017-03-02
CN105164347B (zh) 2017-11-03
GB201519561D0 (en) 2015-12-23
CN105164347A (zh) 2015-12-16

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