EP0389136A1 - Hydraulischer Schwimmkreislauf für einen Ausleger einer Erdbewegungsmaschine - Google Patents

Hydraulischer Schwimmkreislauf für einen Ausleger einer Erdbewegungsmaschine Download PDF

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Publication number
EP0389136A1
EP0389136A1 EP90302288A EP90302288A EP0389136A1 EP 0389136 A1 EP0389136 A1 EP 0389136A1 EP 90302288 A EP90302288 A EP 90302288A EP 90302288 A EP90302288 A EP 90302288A EP 0389136 A1 EP0389136 A1 EP 0389136A1
Authority
EP
European Patent Office
Prior art keywords
float
oil path
path position
valve
boom
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Withdrawn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
EP90302288A
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English (en)
French (fr)
Inventor
Satoshi Miyaoka
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel 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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Publication of EP0389136A1 publication Critical patent/EP0389136A1/de
Withdrawn legal-status Critical Current

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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
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • E02F9/2207—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing or compensating oscillations
    • 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
    • E02F3/435—Control of dipper or bucket position; Control of sequence of drive operations for dipper-arms, backhoes or the like

Definitions

  • This invention relates to a float circuit for a boom of a construction apparatus such as a hydraulic shovel.
  • a hydraulic shovel which as an examle of construction apparatus, commonly has a general construction as shown in Fig. 5.
  • the hydraulic shovel shown includes a lower structure 1, an upper rotating structure 2, and a working attachment 3 mounted on a front portion of the upper rotating structure 2.
  • the working attachment 3 includes a boom 4, a boom cylinder 5, an arm 6, and a bucket 7.
  • the hydraulic shovel normally includes a hydraulic circuit for operation of the components thereof as shown in Fig. 6.
  • the hydraulic circuit shown includes a directional control valve 8 for the boom cylinder 5.
  • the directional control valve 8 has a pair of pilot pressure receiving portions 9 and 10.
  • the hydraulic circuit further includes a remote control valve 11, a main pump 12, and a pilot pump 13.
  • an operating lever 14 of the remote control valve 11 When the boom 4 is to be pivoted upwardly or downwardly, an operating lever 14 of the remote control valve 11 is manually operated to tilt in either direction to a position A or position B. Consequently, pilot hydraulic pressure from the pilot pump 13 acts, by way of an oil path 15, one of a pair of pilot valves 16 and 17 of the remote control valve 11 and another oil path 18 or 19, upon the pilot pressure receiving portion 9 or 10 of the directional control valve 8. Thereupon, the directional control valve 8 is changed over to allow pressure oil from the main pump 12 to be supplied into the boom cylinder 5 by way of a corresponding one of a pair of operating circuits 20 and 21.
  • a float circuit ie a circuit which allows the two sides of a double acting hydraulic cylinder to communicate freely for a boom is employed, for example, in a hydraulic circuit for a wheel loader which is a kind of working vehicles.
  • Fig. 7 shows part of an exemplary hydraulic circuits for a wheel loader (not shown) which includes a float circuit for a boom.
  • the hydraulic circuit shown includes a boom cylinder 22 of the wheel loader, a control valve 23 for the boom cylinder 22 having an operating lever 24.
  • a detecting coil 25 is provided for the control valve 23.
  • the control valve 23 has four positions including a neutral oil path position C, a raising oil path position D, a lowering oil path position E and a float oil path position F.
  • grading can be carried out by stopping movement of the hydraulic shovel and contracting the arm.
  • a float circuit for a boom of a construction apparatus of the type which includes a lower structure, an upper rotating structure on the lower structure, a working attachment mounted on a front portion of the upper rotating structure, and a boom for the working attachment
  • which float circuit comprises a boom cylinder for operating the boom, a directional control valve, a pair of operating circuits for communicating the boom cylinder and the directional control valve, and a selector valve connected between the operating circuits and having an interrupting oil path position in which the operating circuits are not communicated with each other and a float oil path position at which the operating circuits are communicated with each other by way of the selector valve to allow the boom cylinder to assume a floating condition.
  • the selector valve is a solenoid operated valve connected to be operated by an electric circuit which includes a manually operable switch of the automatic returning type and a switch of the manual contact type connected in series to the manually operable switch.
  • the solenoid operated valve assumes the interrupting oil path position, and consequently, even if the manually operable switch of the automatic returning contact type is operated into an on-state, the boom cylinder is not brought into a floating condition.
  • the hydraulic shovel when the boom cylinder is in a floating condition, the hydraulic shovel can carry out a grading operation. Further, if the manually operable switch of the automatic returning contact type is operated suitably, a soil compacting operation or a pile driving operation or the like can be carried out by a bucket of the hydraulic shovel. Accordingly the usefulness of the hydraulic shovel is improved.
  • a hydraulic circuit of a float circuit for a boom according to the present invention. Since the float circuit has substantially similar construction to that of the hydraulic circuit shown in Fig. 6 and is incorporated, for example, in such a hydraulic shovel as shown in Fig. 5, like parts or elements are denoted by like reference characters and the following description will proceed with reference also to the hydraulic shovel shown in Fig. 5. This also applies to the foLlowing embodiments of the present invention described hereinbelow.
  • the hydraulic circuit shown in Fig. 1 has a substantially similar construction to that of the hydraulic circuit shown in Fig. 6 but additionally includes a selector valve 26 with a float oil path position.
  • the selector valve 26 is provided between a pair of operating circuits 20 and 21 which communicate a boom cylinder 5 and a directional control valve 8 for the boom cylinder 5.
  • the selector valve 26 is manually movable to an interrupting oil path position G or a float oil path position H.
  • the selector valve 26 When the selector valve 26 is at the interrupting oil path position G, the operating circuits 20 and 21 are separated from each other so that the boom cylinder 5 cannot be brought into a floating condition. In this condition, the hydraulic shovel functions as the conventional hydraulic shovel described above.
  • Fig. 2 shows another float circuit for a boom according to the present invention.
  • the float circuit shown includes, in place of the selector valve 26 of the float circuit shown in Fig. 1, a solenoid controlled valve 27 as a selector valve with a float oil path position.
  • the solenoid controlled valve 27 also has an interrupting oil path position I and a float oil path position J.
  • the solenoid controlled valve 27 includes a solenoid 28 which is electrically connected to an electric circuit 29.
  • the electric circuit 29 for the solenoid 27 of the solenoid controlled valve 27 includes a switch 30 of the manual contact type and a power source 31.
  • the solenoid operated valve 27 When the manual contact type switch 30 is manually operated into an on-­state, the solenoid operated valve 27 is changed over from the interrupting oil path position I to the float oil path position J.
  • the solenoid operated valve 27 operates in a similar manner to that of the selector valve 26 described above. It is to be noted that the solenoid operated valve 27 may be replaced by a pilot valve with a float oil path position which is changed over in response to a pilot pressure acting thereupon.
  • a float circuit for a boom of a further preferred embodiment of the present invention includes a solenoid operated valve 27 similar to that of the float circuit shown in Fig. 2, but includes an electric circuit 32 which is different in construction from the electric circuit 29 shown in Fig. 2.
  • the electric circuit 32 includes, in addition to the manual contact type switch 30 and the power source 31, a manually operable switch 33 of the automatic returning contact type.
  • the manual contact type switch 30 and the returning contact type switch 33 are connected in series in the electric circuit 32.
  • the solenoid operated valve 27 assumes its interrupting oil path position I, and consequently, even if the returning contact type switch 33 is manually operated into an on-state, the boom cylinder 5 will not be put into a floating condition.
  • the manual contact type switch 30 is manually operated into an on-state and then the returning contact type switch 33 is manually operated into an on-state, then the boom cylinder 5 is put into a floating condition.
  • the boom cylinder 5 remains in the float condition only while the returning contact type switch 33 is held in the on-state.
  • the manual contact type switch 30, for example is manually operated into an on-state and then the directional control valve 8 is changed over to a boom raising oil path position K to raise the boom. Then, when the bucket at the end portion of the working attachment is raised to a required vertical position, the returning contact type switch 33 is operated into an on-state. Consequently, the boom cylinder 5 is changed into a floating condition to allow the bucket to drop or fall together with the boom. In this condition, if the returning contact type switch 33 is suitably operated into an on-state and/or an off-state at suitable timings, then a compacting operation for the soil or a pile driving operation by the bucket can be carried out.
  • a float circuit for a boom of a still further embodiment of the present invention includes, instead of the solenoid operated valve 27 of the float circuit of Fig. 3, a pilot valve 34 as a selector valve with a float oil path position and a solenoid operated selector valve 36 for controlling pilot pressure from the pilot pump 13 to act upon a pilot pressure receiving portion 35 of the pilot valve 34.
  • the pilot valve 34 is provided between the operating circuits 20 and 21 similarly to the solenoid operated valve 27 while a solenoid 37 of the solenoid operated selector valve 36 is connected to an electric circuit 32′ which has a substantially same construction as the electric circuit 32 described hereinabove.
  • the float circuit operates substantially in a similar manner to that of the float circuit shown in Fig. 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Operation Control Of Excavators (AREA)
EP90302288A 1989-03-08 1990-03-05 Hydraulischer Schwimmkreislauf für einen Ausleger einer Erdbewegungsmaschine Withdrawn EP0389136A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP57452/89 1989-03-08
JP1057452A JP2514915B2 (ja) 1989-03-08 1989-03-08 建設機械のブ―ム用フロ―ト回路

Publications (1)

Publication Number Publication Date
EP0389136A1 true EP0389136A1 (de) 1990-09-26

Family

ID=13056058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90302288A Withdrawn EP0389136A1 (de) 1989-03-08 1990-03-05 Hydraulischer Schwimmkreislauf für einen Ausleger einer Erdbewegungsmaschine

Country Status (2)

Country Link
EP (1) EP0389136A1 (de)
JP (1) JP2514915B2 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0436740A1 (de) * 1989-08-02 1991-07-17 Kabushiki Kaisha Komatsu Seisakusho Steuerung eines hydraulischen baggers zum linear baggern
EP0440070A2 (de) * 1990-01-22 1991-08-07 Shin Caterpillar Mitsubishi Ltd. Energiesparschaltung in einem hydraulischen Gerät
WO2001014648A1 (de) * 1999-08-21 2001-03-01 O & K Orenstein & Koppel Aktiengesellschaft Verfahren und arbeitsmaschine zur herstellung von bodenflächen
GB2391268A (en) * 2002-06-14 2004-02-04 Volvo Constr Equip Holding Se Hydraulic circuit for boom cylinder combination having float function
WO2007022546A1 (en) * 2005-08-19 2007-02-22 Adolf Christiaan Ellis Control systems for earth working equipment
EP2378009A2 (de) * 2008-11-19 2011-10-19 Doosan Infracore Co., Ltd. Auslegerzylindersteuerkreis f?r eine baumaschine
WO2015064785A1 (ko) * 2013-10-31 2015-05-07 볼보 컨스트럭션 이큅먼트 에이비 플로팅기능이 구비된 건설기계용 유량제어밸브
WO2015064782A1 (ko) * 2013-10-30 2015-05-07 볼보 컨스트럭션 이큅먼트 에이비 플로트 기능을 구비한 건설장비용 유압장치
DE102014012117A1 (de) * 2014-08-12 2016-02-18 Hydac Fluidtechnik Gmbh Steuerungsvorrichtung für einen fluidisch betätigbaren Arbeitszylinder mit zumindest einer Heben- und Senkenfunktion
EP2955279A4 (de) * 2013-02-05 2016-09-07 Hyun Dai Heavy Ind Co Ltd Baumaschine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0514765U (ja) * 1991-08-06 1993-02-26 株式会社 神崎高級工機製作所 油圧昇降操作装置
KR100876980B1 (ko) * 2003-04-30 2009-01-07 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 붐 플롯포지션 기능을 갖는 유압회로
JP5481269B2 (ja) * 2010-05-06 2014-04-23 キャタピラー エス エー アール エル 作業機械のフロント制御装置
CN110500343A (zh) * 2019-08-26 2019-11-26 柳州柳工挖掘机有限公司 挖掘机推土铲液压系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB742783A (en) * 1951-08-24 1956-01-04 Vickers Armstrongs Ltd Improvements in or relating to hydraulic control systems
US3472127A (en) * 1967-12-12 1969-10-14 Caterpillar Tractor Co Control circuit for bulldozers used in pushing
US4586332A (en) * 1984-11-19 1986-05-06 Caterpillar Tractor Co. Hydraulic swing motor control circuit
US4799851A (en) * 1988-01-28 1989-01-24 Swanson William C Level lift hydraulic valve

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58156758U (ja) * 1982-04-14 1983-10-19 住友重機械工業株式会社 油圧シヨベル
JPS6263724A (ja) * 1985-09-17 1987-03-20 Hitachi Constr Mach Co Ltd 深さ表示装置を備えた作業機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB742783A (en) * 1951-08-24 1956-01-04 Vickers Armstrongs Ltd Improvements in or relating to hydraulic control systems
US3472127A (en) * 1967-12-12 1969-10-14 Caterpillar Tractor Co Control circuit for bulldozers used in pushing
US4586332A (en) * 1984-11-19 1986-05-06 Caterpillar Tractor Co. Hydraulic swing motor control circuit
US4799851A (en) * 1988-01-28 1989-01-24 Swanson William C Level lift hydraulic valve

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 246 (M-510)[2302], 23rd August 1986; & JP-A-61 75 132 (SEIKITAN ROTENBORI KIKAI GIJUTSU KENKYU KUMIAI) 17-04-1986 *
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 246 (M-510)[2302], 23rd August 1986; & JP-A-61 75 133 (SEKITAN ROTENBORI KIKAI GIJUTSU KENKYU KIUMIAI) 17-04-1986 *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0436740A1 (de) * 1989-08-02 1991-07-17 Kabushiki Kaisha Komatsu Seisakusho Steuerung eines hydraulischen baggers zum linear baggern
EP0436740A4 (en) * 1989-08-02 1991-09-11 Kabushiki Kaisha Komatsu Seisakusho Linear excavation control apparatus in hydraulic excavator
US5598648A (en) * 1989-08-02 1997-02-04 Kabushiki Kaisha Komatsu Seisakusho Apparatus for controlling straight excavating operation with hydraulic excavator
EP0440070A2 (de) * 1990-01-22 1991-08-07 Shin Caterpillar Mitsubishi Ltd. Energiesparschaltung in einem hydraulischen Gerät
EP0440070A3 (en) * 1990-01-22 1992-07-08 Shin Caterpillar Mitsubishi Ltd. Energy saving circuit in a hydraulic apparatus
WO2001014648A1 (de) * 1999-08-21 2001-03-01 O & K Orenstein & Koppel Aktiengesellschaft Verfahren und arbeitsmaschine zur herstellung von bodenflächen
US7490421B1 (en) 1999-08-21 2009-02-17 Herrn Georg Pletzer Method and construction machine for producing ground surfaces
GB2391268B (en) * 2002-06-14 2005-12-14 Volvo Constr Equip Holding Se Hydralic circuit for boom cylinder having float function
US6892535B2 (en) 2002-06-14 2005-05-17 Volvo Construction Equipment Holding Sweden Ab Hydraulic circuit for boom cylinder combination having float function
GB2391268A (en) * 2002-06-14 2004-02-04 Volvo Constr Equip Holding Se Hydraulic circuit for boom cylinder combination having float function
WO2007022546A1 (en) * 2005-08-19 2007-02-22 Adolf Christiaan Ellis Control systems for earth working equipment
EP2378009A2 (de) * 2008-11-19 2011-10-19 Doosan Infracore Co., Ltd. Auslegerzylindersteuerkreis f?r eine baumaschine
EP2378009A4 (de) * 2008-11-19 2014-03-05 Doosan Infracore Co Ltd Auslegerzylindersteuerkreis für eine baumaschine
US8807013B2 (en) 2008-11-19 2014-08-19 Doosan Infracore Co., Ltd. Boom cylinder control circuit for construction machine
EP2955279A4 (de) * 2013-02-05 2016-09-07 Hyun Dai Heavy Ind Co Ltd Baumaschine
WO2015064782A1 (ko) * 2013-10-30 2015-05-07 볼보 컨스트럭션 이큅먼트 에이비 플로트 기능을 구비한 건설장비용 유압장치
WO2015064785A1 (ko) * 2013-10-31 2015-05-07 볼보 컨스트럭션 이큅먼트 에이비 플로팅기능이 구비된 건설기계용 유량제어밸브
US10208456B2 (en) 2013-10-31 2019-02-19 Volvo Construction Equipment Ab Flow control valve for construction equipment, having floating function
DE102014012117A1 (de) * 2014-08-12 2016-02-18 Hydac Fluidtechnik Gmbh Steuerungsvorrichtung für einen fluidisch betätigbaren Arbeitszylinder mit zumindest einer Heben- und Senkenfunktion

Also Published As

Publication number Publication date
JP2514915B2 (ja) 1996-07-10
JPH02236318A (ja) 1990-09-19

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