EP1550774B1 - Ram cylinder control system for wheel type excavator - Google Patents

Ram cylinder control system for wheel type excavator Download PDF

Info

Publication number
EP1550774B1
EP1550774B1 EP04030864A EP04030864A EP1550774B1 EP 1550774 B1 EP1550774 B1 EP 1550774B1 EP 04030864 A EP04030864 A EP 04030864A EP 04030864 A EP04030864 A EP 04030864A EP 1550774 B1 EP1550774 B1 EP 1550774B1
Authority
EP
European Patent Office
Prior art keywords
ram cylinder
ram
joystick
cylinder control
control valve
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.)
Ceased
Application number
EP04030864A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1550774A2 (en
EP1550774A3 (en
Inventor
Dong Jae Lee
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.)
HD Hyundai Infracore Co Ltd
Original Assignee
Doosan Infracore 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 Doosan Infracore Co Ltd filed Critical Doosan Infracore Co Ltd
Publication of EP1550774A2 publication Critical patent/EP1550774A2/en
Publication of EP1550774A3 publication Critical patent/EP1550774A3/en
Application granted granted Critical
Publication of EP1550774B1 publication Critical patent/EP1550774B1/en
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump

Definitions

  • the present invention relates to a system for controlling a ram cylinder interposed between an axle and an upper frame in a wheel type hydraulic excavator, and in particular to a ram cylinder control system for a wheel type excavator for automatically locking or releasing a ram cylinder depending on the operating mode of an excavator.
  • pilot hydraulic pump 105 the hydraulic oil from a pilot hydraulic pump 105 is controlled by a pilot control valve 107 by way of a pilot feed line 106, and the controlled hydraulic oil acts as pilot pressure (P1a-P2a) for controlling the control valve 102.
  • pilot pressure P1a-P2a
  • the check valves 111b allow the hydraulic oil to be discharged from each of the ram cylinders 111 in this manner, the hydraulic oil in the ram cylinders 111 is capable of flowing freely, thereby permitting the extension and retraction movement of the ram cylinders 111. If the pilot pressure ceases to exist, the check valves 111b will block off the discharge of the hydraulic oil from each of the ram cylinders 111. Consequently, the working fluid in both of the ram cylinders 111 cannot flow in any direction, thereby locking the ram cylinders 111.
  • the control system for locking or releasing the ram cylinders 111 is provided with a ram cylinder hydraulic line 108 for supplying hydraulic oil from the pilot hydraulic pump to the pressure receiving parts of the check valves 111b, a solenoid ram cylinder control valve 109 for controlling the flow of hydraulic oil through the ram cylinder hydraulic line 109, and a ram cylinder locking switch 116 for feeding or cutting off the solenoid operating power to the ram cylinder control valve 109.
  • an object of the present invention is to provide a ram cylinder control system for automatically locking or releasing ram cylinders according to operation modes of an excavator, thereby assuring easy and convenient manipulation of a hydraulic excavator.
  • a ram cylinder control system for a wheel type excavator having brakes, a joy stick and ram cylinders for supporting an upper frame of a vehicle body, comprising: a pilot hydraulic pump; pilot-opened check valves for normally prohibiting discharge of working fluid from the ram cylinders to lock the ram cylinders; a ram cylinder control valve adapted to shift from a home position to an operating position in response to a valve control signal for allowing the hydraulic oil from the pilot hydraulic pump to open the check valves so that the hydraulic oil can be discharged from the ram cylinders; brake pressure sensing means for detecting hydraulic oil pressure supplied to the brakes; joystick position detector means for detecting position of the joystick to generate one of a forward position signal, a backward position signal and a neutral signal; and a controller for applying the valve control signal to the ram cylinder control valve if the forward position signal or the backward position signal is generated from the joystick position
  • a hydraulic circuit diagram of a ram cylinder control system for a wheel type excavator according to the present invention.
  • the ram cylinder control system for a wheel type excavator comprises a main hydraulic pump for supplying hydraulic oil to various hydraulic actuators such as a travel motor 1, a pilot hydraulic pump 20 for supplying pilot pressure to control valves, and an auxiliary pump 30 for supplying hydraulic pressure to brakes 5 provided on vehicle axles 4.
  • a brake pressure sensor 17 is provided between brake lines 16a, 16b for feeding the brakes 5 with the hydraulic oil from the auxiliary pump 30.
  • the brake pressure sensor 17 is adapted to detect a brake pressure in the brake lines 16a, 16b, whichever is higher, and then input a corresponding signal into a controller 19 described later.
  • this joystick 26 is positioned at the forward position or the backward position and thus the forward position signal or the backward position signal is generated, the signal is supplied to the forward control valve 25a or the backward control valve 25b through the controller 19 described later, thereby shifting the corresponding one of the traveling control valves 25a, 25b.
  • the forward control valve 25a or the backward control valve 25b is shifted, the hydraulic oil from the pilot hydraulic pump 20 acts as the forward pilot pressure or the backward pilot pressure through the traveling control pilot line 27a or 27b. If the joystick 26 is positioned at the neutral position 26c, no traveling signal is fed to the traveling control valves 25a, 25b.
  • connection lines 24a has a pair of check valves 24b that normally block off the discharge of hydraulic oil from each of the ram cylinders 24.
  • the ram cylinder control valve 29 is always resiliently biased to the home position 29b by a return spring 29c provided at one side of the control valve 29. In addition, if a signal is applied to a solenoid part 29d, the ram cylinder control valve 29 is shifted toward the operating position 29a. The solenoid part 29d is activated if a ram cylinder-locking signal is applied from the controller 19.
  • ram cylinder control valve 29 if a ram cylinder releasing signal is applied to the solenoid part 29d from the controller 19, the ram cylinder control valve 29 is shifted to the operating position 29 and thus releases the ram cylinders 24, but if no ram cylinder releasing signal is applied to the solenoid part 29d from the controller, the ram cylinder control valve 29 returns to its home position 29b and thus causes the ram cylinders 24 to be locked.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)
EP04030864A 2003-12-29 2004-12-28 Ram cylinder control system for wheel type excavator Ceased EP1550774B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2003098611 2003-12-29
KR1020030098611A KR100988420B1 (ko) 2003-12-29 2003-12-29 휠타입 굴삭기의 램실린더 제어장치

Publications (3)

Publication Number Publication Date
EP1550774A2 EP1550774A2 (en) 2005-07-06
EP1550774A3 EP1550774A3 (en) 2005-08-10
EP1550774B1 true EP1550774B1 (en) 2008-03-26

Family

ID=34567846

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04030864A Ceased EP1550774B1 (en) 2003-12-29 2004-12-28 Ram cylinder control system for wheel type excavator

Country Status (5)

Country Link
EP (1) EP1550774B1 (ja)
JP (1) JP2005194870A (ja)
KR (1) KR100988420B1 (ja)
CN (1) CN100591871C (ja)
DE (1) DE602004012700T2 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102338134A (zh) * 2011-10-24 2012-02-01 中联重科股份有限公司 混凝土泵送设备及其泵送油缸的换向控制方法
WO2016032811A1 (en) * 2014-08-27 2016-03-03 Caterpillar Inc. Hydraulic winch control system and method

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100753988B1 (ko) * 2006-06-09 2007-08-31 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 건설중장비용 엑슬 록킹 실린더 구조
JP4944537B2 (ja) * 2006-08-09 2012-06-06 日立建機株式会社 油圧駆動車両の走行制御装置
DE102007018405B4 (de) * 2007-04-17 2022-09-15 Alpha Fluid Hydrauliksysteme Müller GmbH Elektrohydraulische Ansteuerung
KR102042285B1 (ko) * 2013-12-26 2019-11-27 두산인프라코어 주식회사 휠 타입 건설기계의 램실린더 제어 장치 및 그 방법
CN105351272B (zh) * 2015-12-11 2017-05-24 重庆纳川山隅重工设备有限公司 液压凿岩钻机的自适应阀组
KR102533655B1 (ko) * 2016-09-05 2023-05-17 에이치디현대인프라코어 주식회사 건설 기계

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55114610A (en) * 1979-02-21 1980-09-04 Kubota Ltd Working car
NL8200556A (nl) * 1982-02-13 1983-09-01 Rotterdamsche Droogdok Mij Voertuig.
US4835970A (en) * 1985-08-13 1989-06-06 Nissan Motor Co. Ltd. Pneumatic power brake system
JPS6361621A (ja) 1986-09-02 1988-03-17 Hitachi Constr Mach Co Ltd 作業車両のラムロツク制御装置
JP2937329B2 (ja) * 1987-10-26 1999-08-23 日立建機株式会社 作業車両のラムロック制御装置
JPH0662269B2 (ja) * 1989-04-21 1994-08-17 株式会社神戸製鋼所 移動式クレーンの変位抑制装置
KR970040698A (ko) 1995-12-29 1997-07-24 유상부 휠타입 굴삭기의 작업브레이크장치
US6592190B2 (en) * 2001-07-11 2003-07-15 Deere & Company Secondary brake system with electrohydraulic proportional valve
KR200315168Y1 (ko) 2003-02-19 2003-06-02 정권철 굴삭기의 차축 록킹제어장치

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102338134A (zh) * 2011-10-24 2012-02-01 中联重科股份有限公司 混凝土泵送设备及其泵送油缸的换向控制方法
CN102338134B (zh) * 2011-10-24 2013-08-21 中联重科股份有限公司 混凝土泵送设备及其泵送油缸的换向控制方法
WO2016032811A1 (en) * 2014-08-27 2016-03-03 Caterpillar Inc. Hydraulic winch control system and method

Also Published As

Publication number Publication date
DE602004012700T2 (de) 2009-04-16
CN100591871C (zh) 2010-02-24
JP2005194870A (ja) 2005-07-21
EP1550774A2 (en) 2005-07-06
EP1550774A3 (en) 2005-08-10
DE602004012700D1 (de) 2008-05-08
CN1637211A (zh) 2005-07-13
KR20050067620A (ko) 2005-07-05
KR100988420B1 (ko) 2010-10-18

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