EP0955415A4 - Hydraulic shovel - Google Patents

Hydraulic shovel

Info

Publication number
EP0955415A4
EP0955415A4 EP98945533A EP98945533A EP0955415A4 EP 0955415 A4 EP0955415 A4 EP 0955415A4 EP 98945533 A EP98945533 A EP 98945533A EP 98945533 A EP98945533 A EP 98945533A EP 0955415 A4 EP0955415 A4 EP 0955415A4
Authority
EP
European Patent Office
Prior art keywords
working machine
hydraulic shovel
boom
earth
excavation
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Withdrawn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
EP98945533A
Other languages
German (de)
French (fr)
Other versions
EP0955415A1 (en
Inventor
Tooru Kobayashi
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 EP0955415A1 publication Critical patent/EP0955415A1/en
Publication of EP0955415A4 publication Critical patent/EP0955415A4/en
Withdrawn legal-status Critical Current

Links

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
    • E02F9/2025—Particular purposes of control systems not otherwise provided for
    • E02F9/2033—Limiting the movement of frames or implements, e.g. to avoid collision between implements and the cabin
    • 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
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves 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
    • E02F9/2285—Pilot-operated systems

Abstract

A hydraulic shovel capable of enhancing a mechanical capacity, which a working machine (4) originally has with respect to an excavation depth, up to a limit level at which the same capacity can be fully displayed when an excavation operation is carried out by the working machine (4) of the hydraulic shovel provided with an earth-moving blade (3). The hydraulic shovel comprises a controller (40) adapted to output a control signal capable of gradually increasing an amount of throttling a solenoid proportional reducing valve (17) as a first boom (5) approaches a dangerous region when an angle of turn of the first boom (5) changes from a limit level to a level in a predetermined range during construction work carried out by the working machine (4) with a traveling body (1) facing in a forward direction, and have an interference preventing function for reliably preventing the first boom (5) from lowering excessively and interfering with the earth-moving blade (3); and a swingable body (2) turned substantially 180° with a change-over switch (37) pressed when an excavation operation to a further depth is demanded after the earth has been excavated to a position close to a maximum excavation depth Hd1 by the working machine (4), to thereby render the interference preventing function ineffective and enable the subsequent excavation operation to a maximum excavation depth Hd2 to be continued.
EP98945533A 1997-10-01 1998-09-30 Hydraulic shovel Withdrawn EP0955415A4 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP26872197 1997-10-01
JP26872197 1997-10-01
PCT/JP1998/004402 WO1999016980A1 (en) 1997-10-01 1998-09-30 Hydraulic shovel

Publications (2)

Publication Number Publication Date
EP0955415A1 EP0955415A1 (en) 1999-11-10
EP0955415A4 true EP0955415A4 (en) 2001-01-17

Family

ID=17462431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98945533A Withdrawn EP0955415A4 (en) 1997-10-01 1998-09-30 Hydraulic shovel

Country Status (5)

Country Link
EP (1) EP0955415A4 (en)
JP (1) JP3681409B2 (en)
AU (1) AU735431B2 (en)
NZ (1) NZ336119A (en)
WO (1) WO1999016980A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014074713A1 (en) 2012-11-07 2014-05-15 Parker-Hannifin Corporation Smooth control of hydraulic actuator
WO2021192020A1 (en) * 2020-03-24 2021-09-30 株式会社日立建機ティエラ Construction machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09242110A (en) * 1996-03-12 1997-09-16 Hitachi Constr Mach Co Ltd Interference-preventive device of hydraulic construction machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819827B2 (en) * 1975-03-03 1983-04-20 株式会社クボタ Hide Souchi Fusetuno
JP3246794B2 (en) * 1993-04-30 2002-01-15 日立建機株式会社 Work machine control device
JP2793950B2 (en) * 1993-10-12 1998-09-03 日立建機株式会社 Driver's cab interference prevention device for work equipment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09242110A (en) * 1996-03-12 1997-09-16 Hitachi Constr Mach Co Ltd Interference-preventive device of hydraulic construction machine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 01 30 January 1998 (1998-01-30) *
See also references of WO9916980A1 *

Also Published As

Publication number Publication date
EP0955415A1 (en) 1999-11-10
NZ336119A (en) 2000-10-27
WO1999016980A1 (en) 1999-04-08
JP3681409B2 (en) 2005-08-10
AU735431B2 (en) 2001-07-05
AU9280098A (en) 1999-04-23

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Legal Events

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