EP1600419A1 - Dispositif de commande hydraulique d'une machine de travail hydraulique - Google Patents

Dispositif de commande hydraulique d'une machine de travail hydraulique Download PDF

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Publication number
EP1600419A1
EP1600419A1 EP04715501A EP04715501A EP1600419A1 EP 1600419 A1 EP1600419 A1 EP 1600419A1 EP 04715501 A EP04715501 A EP 04715501A EP 04715501 A EP04715501 A EP 04715501A EP 1600419 A1 EP1600419 A1 EP 1600419A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
boom
line
hydraulic
pressure
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP04715501A
Other languages
German (de)
English (en)
Other versions
EP1600419A4 (fr
Inventor
Kensuke Tsukubaryo SATO
Tsukasa Toyooka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co 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 Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Publication of EP1600419A1 publication Critical patent/EP1600419A1/fr
Publication of EP1600419A4 publication Critical patent/EP1600419A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
    • E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
    • E02F3/433—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude horizontal, e.g. self-levelling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/065—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted
    • B66F9/0655—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted with a telescopic boom

Definitions

  • This invention relates to a hydraulic control system for a hydraulic working machine, such as a lift truck, provided with a boom and an attachment an angle of which in a raising/lowering direction relative to a body can be maintained at a preset angle irrespective of an up/down angle of the boom.
  • Conventionally known hydraulic working machines include cargo handling vehicles called lift trucks, and also high-lift work platform vehicles.
  • high-lift work platform vehicles those disclosed, for example, in JP-B-2566631 [U] are known.
  • a level correcting operation is selected by a selector switch to perform a level correction independently.
  • a selector switch is selected by a selector switch to perform a level correction independently.
  • the present invention has been completed in view of the above-described circumstances of the conventional technology, and has as an object thereof the provision of a hydraulic control system for a hydraulic working machine, which provides the hydraulic working machine with a high lift capacity without making its boom-raising operation speed slower than the conventional boom-raising operation speed.
  • the present invention provides, in a first aspect thereof, a hydraulic control system for a hydraulic working machine provided with a boom pivotally mounted at an end thereof on a stationary side, a first cylinder for causing an opposite end of the boom to turn as a free end in a raising/lowering direction, an attachment pivotally mounted on a free end portion of the boom, a second cylinder for causing the attachment to turn in a raising/lowering direction relative to the boom, a third cylinder extendable/retractable in an interlocked relation with an up/down motion of the boom such that responsive to a change in the up/down angle of the boom, an angle of the attachment in the raising/lowering direction is maintained at a preset angle, a hydraulic pump for feeding pressure oil to the first and second cylinders, respectively, a directional control valve for controlling flows of the pressure oil to be fed from the hydraulic pump to the first and second cylinders, respectively, and a control unit for changing over the directional control valve, characterized in that the hydraulic control system is provided with a first cylinder for causing
  • the present invention is characterized in that in the first aspect, a third line is arranged connecting a first line, which is connected to the bottom chamber of the first cylinder, and a second line, which is connected to the bottom chamber of the third cylinder, with each other.
  • the present invention is characterized in that in the second aspect, the communicating means comprises a first selector valve arranged on the third line, and a second selector valve arranged for being changed over responsive to an operation of the control unit such that a pressure in the first line is guided to a pilot port of the first selector valve.
  • the present invention is characterized in that in the third aspect, the control unit is a hydraulically-piloted control unit, and the second selector valve guides the hydraulic pilot pressure to the pilot port to perform a change-over of the first selector valve.
  • the present invention is characterized in that in the first aspect, the boom is provided with a telescopic mechanism of at least two stages.
  • the present invention is characterized in that in the first aspect, the attachment comprises one of a fork, a basket and a bucket.
  • the present invention is characterized in that in the first aspect, the stationary side is arranged on a body of the hydraulic working machine.
  • the present invention is characterized in that in any one of the first to seventh aspects, the hydraulic working machine comprises one of a lift truck and a high-lift work platform vehicle.
  • the first cylinder corresponds to the lift cylinder 7, the second cylinder to the tilt cylinder 8, the third cylinder to the level cylinder 9, the communicating means to the first and second selector valves 21,22, the hydraulic pump to numeral 10, the directional control valve to numeral 11, the control unit to numeral 13, the first selector valve to the first selector valve 21, the second selector valve to the second selector valve 20, the first line to the line 35, the second line to the line 33, the third line to the line 37, and the pilot port of the first selector valve to sign 21d, respectively.
  • the pressure oil delivered from the hydraulic pump is fed to both of the bottom chamber of the first cylinder and the bottom chamber of the third cylinder.
  • the extending force of the third cylinder can, therefore, be used as drive force for causing the boom to turn, thereby making it possible to provide the hydraulic working machine with a higher lift capacity.
  • FIG. 2 is a view illustrating one example of a lift truck as a hydraulic working machine according to the embodiment of the present invention.
  • the lift truck according to this embodiment is provided with a body 1 having front wheels 2, rear wheels 3 and an operator's cab 4, an extendable/retractable boom 5 pivotally mounted at an end thereof on the body 1, an attachment 6 such as fork pivotally mounted on a free end portion of the boom 5, an lift cylinder 7 for causing the boom 5 to turn in a raising/lowering direction (direction A-B) relative to the body 1, a tilt cylinder 8 arranged between the boom 5 and the attachment 6 to cause the attachment 6 to turn in a tilt direction (direction C-D) relative to the boom 5, and a level cylinder 9 arranged between the body 1 and the boom 5 such that the level cylinder is caused to extend or retract in an interlocked relation with a raising or lowering operation of the boom 5.
  • the level cylinder 9 serves to maintain at a preset angle a relative angle (tilt angle) of the attachment 6 in the raising/lowering direction relative to the body 1 even when the up/down angle of the boom 5 relative to the body 1 is changed, and is connected with the tilt cylinder 8 via an unillustrated line.
  • a load-carrying fork is shown as the attachment 6 by way of example. It is also possible to use, for example, a bucket for performing earth or sand digging or land grading or a basket for carrying one or more loads or people upwards.
  • FIG. 1 Illustrated in FIG. 1 is a circuit diagram of a hydraulic circuit arranged on the lift truck of the above-described construction. It is to be noted that in the circuit diagram of FIG. 1, the boom 5 is extendable or retractable in plural stages, for example, five stages although a hydraulic circuit for causing the boom 5 to extend or retract is omitted as it is not directly relevant to the description of the present invention.
  • the hydraulic circuit according to this embodiment is constructed of a hydraulic pump 10 as a hydraulic pressure source, a directional control valve 11 for controlling a flow of pressure oil to be fed from the hydraulic pump 10 to the lift cylinder 7, a directional control valve 12 for controlling a flow of pressure oil to be fed from the hydraulic pump 10 to the tilt cylinder 8, a control unit 13 for the directional control valve 11, a control unit 14 for the directional control valve 12, lines 35,36 connecting the directional control valve 11 and the lift cylinder 7 with each other, a counterbalance valve 15 arranged on the line 35 (the line on the side of a bottom chamber of the lift cylinder 7), lines 31, 32 connecting the directional control valve 12 and the tilt cylinder 8 with each other, a counterbalance valve 16 arranged on the line 31 (the line on the side of a bottom chamber of the tilt cylinder 8), a line 33 connecting the line 31 and a bottom chamber 9a of the level cylinder 9 (the line on the side of the bottom chamber of the level cylinder 9), a
  • a line 37 is arranged to connect the line 35 on the side of the bottom chamber of the lift cylinder 7 and the line 33 on the side of the bottom chamber of the level cylinder 9 with each other.
  • the first selector valve 21 and the second selector valve 20 Arranged on this line 37 are the first selector valve 21 and the second selector valve 20 which is changed over by a boom-raising operation through the control unit 13 to feed a pressure from the line 35 on the side of the bottom chamber of the lift cylinder 7 to the pilot port 21d of the first selector valve 21.
  • the preset pressure or the preset change-over pressure for the first selector valve 21, which is set by a return spring 21c arranged on the first selector valve 21, is set at a value slightly lower than a preset valve for the relief valve 17.
  • the term "communicating means" as used in the claims is constructed of a combination of the first selector valve 21 and the second selector valve 20.
  • the second selector valve 20 When no boom-raising pilot pressure is acting on a pilot port 20d of the second selector valve 20, the second selector valve 20 is maintained at a position 20a. Because it is only the tank pressure that is acting on the pilot port 21d of the first selector valve 21 at this time, the first selector valve 21 is maintained at a position 21a, the line 31 and the line 37 are cut off, and the line 31 and the line 33 are communicated with each other via the first selector valve 21.
  • the level cylinder 9 When the boom 5 is caused to turn in the lowering direction, the level cylinder 9 is forced to retract so that the working oil is pushed out of the bottom chamber 9a of the level cylinder 9. Therefore, the working oil flows into the bottom chamber 8a of the tilt cylinder 8 through the line 33, line 31 and the check valve 16a of the counterbalance valve 16, the tilt cylinder 8 operates in the extending direction, and the attachment 6 turns in the raising direction (direction C).
  • the working oil pushed out of the rod chamber 8b of the tilt cylinder 8 in association with the extending operation of the tilt cylinder 8 is guided to the rod chamber 9b of the level cylinder 9 via the line 32 and line 34.
  • the directional control valve 11 When a boom-raising operation is performed by the operator, the directional control valve 11 is changed over to the position 11a and the second selector valve 20 is changed over to a position 20b, both, by a pilot pressure from the control unit 13.
  • the pressure oil delivered from the hydraulic pump 10 is fed to the bottom chamber 7a of the lift cylinder 7 through the line 30, directional control valve 11, line 35, and the check valve 15a of the counterbalance valve 15.
  • the pressure in the line 35 (the working pressure for the lift cylinder 7) also acts on the pilot port 21d of the first selector valve 21 via the line 37.
  • the working pressure for the lift cylinder 7 becomes higher as the weight of a load under lifting by the attachment 6 becomes greater.
  • the first selector valve When the working pressure for the lift cylinder 7 is lower than the preset pressure for the first selector valve 21, the first selector valve is maintained at the position 21a, and therefore, the cut-off state between the line 31 and the line 37 and the communicated state between the line 31 and the line 33 are maintained. Accordingly, a raising operation of the boom 5 and an adjusting operation of the tilt angle of the attachment 6 in association with the raising operation of the boom 5 are also performed in the above-described procedure.
  • the first selector valve 21 When the working pressure for the lift cylinder 7 is higher than the preset pressure for the first selector valve 21, on the other hand, the first selector valve 21 is changed over to a position 21b, and therefore, the line 33 and the line 35 are connected with each other via the line 37 and the line 31 and the tank 18 are connected with each other. Accordingly, the pressure oil delivered from the hydraulic pump 10 is fed to the bottom chamber 7a of the lift cylinder 7 through the line 30, directional control valve 11 and line 35, and a portion of the pressure oil in the line 35 is fed to the bottom chamber 9a of the level cylinder 9 through the line 37, selector valve 21 and line 33.
  • control units 13,14 electrically-operated control units are also usable although the hydraulically-piloted control units are exemplified in this embodiment.
  • the control units are each constructed such that a manipulation of the control lever 13a outputs an electrical signal and the second selector valve 20 is changed over by the electrical signal outputted by the manipulation of the control lever 13a.
  • FIG. 1 it is also possible to construct in such a way that a pressure sensor is arranged in the pilot circuit connected to the pilot port 11d on the side of the bottom chamber of the directional control valve 11, a change in pressure is detected by the pressure sensor, and the detection signal (electrical signal) is converted into a pressure, for example, by an electrohydraulic valve, and the pressure is then guided to the pilot port 20d of the second selector valve 20 to change over the second selector valve 20.
  • a pressure sensor is arranged in the pilot circuit connected to the pilot port 11d on the side of the bottom chamber of the directional control valve 11, a change in pressure is detected by the pressure sensor, and the detection signal (electrical signal) is converted into a pressure, for example, by an electrohydraulic valve, and the pressure is then guided to the pilot port 20d of the second selector valve 20 to change over the second selector valve 20.
  • the change-over means for communicating the line 37 is constructed of the first and second selector valves 21,20. It is also possible to construct in such a way that pressure sensors are arranged on the line 37 and in the pilot circuit connected to the pilot port 11d on the side of the bottom chamber of the directional control valve 11, respectively, and, when a controller detects based on signals from the respective pressure sensors that the pressure in the line 37 is higher than a preset pressure and the directional control valve 11 has been changed over to the boom-raising side, the first selector valve 21 is changed over by a control signal from the controller. It is to be noted that this change-over can be performed by converting the control signal from the controller into a pressure, for example, through an electrohydraulic valve and applying the pressure to the pilot port 21d of the first selector valve 21.
  • the hydraulic working machine is provided with a means (the selector valve 20, 21) for changing the communicated state between the line 35 on the side of the bottom chamber of the lift cylinder 7 and the line 33 on the side of the bottom chamber of the level cylinder 9 on the basis of a pressure value preset for the line 37 through which the lines 35 and 33 are connected with each other, the lines 33,35 on the side of the respective bottom chambers are brought into communication with each other when the working pressure for the lift cylinder 7 becomes higher than the preset pressure for the circuit change-over means during a boom-raising operation, and as a result, the pressure oil delivered from the hydraulic pump 10 is fed to both of the bottom chamber of the lift cylinder 7 and the bottom chamber of the level cylinder 9.
  • This has made it possible to also use the extending force of the level cylinder 9 as a drive force for causing the boom to turn, thereby making it possible to provide the hydraulic working machine with an increased lift capacity.
  • the pressure-receiving area of the lift cylinder 7 can be reduced without sacrificing the lift capacity of the hydraulic working machine, thereby making it possible to reduce the manufacturing cost of the hydraulic working machine.
  • the means for feeding the pressure oil, which has been delivered from the hydraulic pump, to the level cylinder is constructed of the two selector valves 20, 21 in the hydraulic working machine of this embodiment. This construction has made is possible to make up the feed means by a combination of general-purpose components.
  • the communicating means is constructed of the first selector valve 21 and the second selector valve 20 in this embodiment. It is, however, to be noted that the communicating means is not limited to the above-described combination of the selector valves 21 and 22 and can have a desired design as needed insofar as the communicating means is provided with a function to bring the side of the bottom chamber of the first cylinder and the side of the bottom chamber of the third cylinder into communication with each other when the working pressure for the first cylinder becomes higher than the present pressure during a boom-raising operation.
EP04715501A 2003-02-27 2004-02-27 Dispositif de commande hydraulique d'une machine de travail hydraulique Withdrawn EP1600419A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2003051569 2003-02-27
JP2003051569 2003-02-27
PCT/JP2004/002380 WO2004076334A1 (fr) 2003-02-27 2004-02-27 Dispositif de commande hydraulique d'une machine de travail hydraulique

Publications (2)

Publication Number Publication Date
EP1600419A1 true EP1600419A1 (fr) 2005-11-30
EP1600419A4 EP1600419A4 (fr) 2006-12-27

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ID=32923369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04715501A Withdrawn EP1600419A4 (fr) 2003-02-27 2004-02-27 Dispositif de commande hydraulique d'une machine de travail hydraulique

Country Status (5)

Country Link
EP (1) EP1600419A4 (fr)
JP (1) JPWO2004076334A1 (fr)
KR (1) KR20050101351A (fr)
CN (1) CN1753831A (fr)
WO (1) WO2004076334A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018044871A1 (fr) * 2016-08-30 2018-03-08 Clark Equipment Company Dispositif de levage de puissance
US10227997B2 (en) 2014-10-02 2019-03-12 Hitachi Construction Machinery Co., Ltd. Hydraulic drive system for work machine
US10436229B2 (en) 2014-10-02 2019-10-08 Hitachi Construction Machinery Co., Ltd. Hydraulic drive system for work machine
EP3816095A1 (fr) * 2019-10-30 2021-05-05 Kramer-Werke GmbH Machine motrice dotée d'un cadre et d'une flèche pivotante

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KR100866633B1 (ko) * 2007-05-30 2008-11-03 강남국 유압장치 및 이를 이용한 동조 선회 시스템
JP5300448B2 (ja) * 2008-12-12 2013-09-25 カヤバ工業株式会社 走行機構を備えた作業機用制御回路
KR101088752B1 (ko) * 2009-05-22 2011-12-01 볼보 컨스트럭션 이큅먼트 에이비 복합 조작성을 개선시킨 유압시스템
CN102030293B (zh) * 2010-12-10 2012-09-19 徐州重型机械有限公司 举高作业车及其平台调平液压系统
CN102616707B (zh) * 2011-01-30 2014-10-29 长沙中联消防机械有限公司 工作斗调平控制装置
CN103046590A (zh) * 2013-01-30 2013-04-17 江苏柳工机械有限公司 一种装载机工作液压系统的控制方法
CN103629175B (zh) * 2013-11-28 2016-05-04 长沙中联消防机械有限公司 工作斗液压控制系统与工程车辆
CN104728200B (zh) * 2013-12-24 2018-05-15 卡特彼勒（青州）有限公司 液压系统和包括该液压系统的装载机
JP6618366B2 (ja) * 2016-01-14 2019-12-11 日立建機株式会社 ホイールローダの荷役装置
DE112016000070B4 (de) * 2016-05-31 2021-09-30 Komatsu Ltd. Arbeitsmaschinensteuersystem, arbeitsmaschine und arbeitsmaschinensteuerverfahren
CN107061388B (zh) * 2017-04-07 2018-05-01 临工集团济南重机有限公司 一种防止下坡抖动及转向吸空的升降工作平台液驱机构
KR101980909B1 (ko) * 2018-02-13 2019-05-21 강남국 고소작업차의 붐 인입 보조장치
CN109610537A (zh) * 2018-11-20 2019-04-12 江苏徐工工程机械研究院有限公司 一种工程车辆铲斗调平机构
JP7165155B2 (ja) * 2020-03-11 2022-11-02 株式会社日立建機ティエラ 作業機械
CN112064698A (zh) * 2020-08-21 2020-12-11 中联重科股份有限公司 基于角度的铲斗自动调平控制方法和系统

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FR2731729A1 (fr) * 1995-03-16 1996-09-20 Soc Et Et D Innovation Dans Le Systeme de commande hydraulique pour chargeur
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DE3545185C1 (en) * 1985-12-20 1987-07-23 Krupp Gmbh Luffing-crane jib
DE4331777A1 (de) * 1993-09-18 1995-03-30 Schaeff Karl Gmbh & Co Weitwinkel-Schwenkantrieb für den Grundausleger einer Lademaschine
FR2731729A1 (fr) * 1995-03-16 1996-09-20 Soc Et Et D Innovation Dans Le Systeme de commande hydraulique pour chargeur
EP1195470A1 (fr) * 2000-10-03 2002-04-10 NEW HOLLAND ITALIA S.p.A. Machine de terrassement

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10227997B2 (en) 2014-10-02 2019-03-12 Hitachi Construction Machinery Co., Ltd. Hydraulic drive system for work machine
US10436229B2 (en) 2014-10-02 2019-10-08 Hitachi Construction Machinery Co., Ltd. Hydraulic drive system for work machine
WO2018044871A1 (fr) * 2016-08-30 2018-03-08 Clark Equipment Company Dispositif de levage de puissance
US11339041B2 (en) 2016-08-30 2022-05-24 Clark Equipment Company Power lift
EP3816095A1 (fr) * 2019-10-30 2021-05-05 Kramer-Werke GmbH Machine motrice dotée d'un cadre et d'une flèche pivotante

Also Published As

Publication number Publication date
CN1753831A (zh) 2006-03-29
KR20050101351A (ko) 2005-10-21
WO2004076334A1 (fr) 2004-09-10
JPWO2004076334A1 (ja) 2006-06-01
EP1600419A4 (fr) 2006-12-27

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