KR890017431A - Hydraulic circuit for civil construction machinery - Google Patents

Hydraulic circuit for civil construction machinery Download PDF

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Publication number
KR890017431A
KR890017431A KR1019890006775A KR890006775A KR890017431A KR 890017431 A KR890017431 A KR 890017431A KR 1019890006775 A KR1019890006775 A KR 1019890006775A KR 890006775 A KR890006775 A KR 890006775A KR 890017431 A KR890017431 A KR 890017431A
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KR
South Korea
Prior art keywords
valve
actuator
construction machinery
civil construction
hydraulic circuit
Prior art date
Application number
KR1019890006775A
Other languages
Korean (ko)
Other versions
KR0128094B1 (en
Inventor
도시아끼 쓰끼모도
Original Assignee
이와바시 아끼라
도시바기가이가부시끼가이샤
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 이와바시 아끼라, 도시바기가이가부시끼가이샤 filed Critical 이와바시 아끼라
Publication of KR890017431A publication Critical patent/KR890017431A/en
Application granted granted Critical
Publication of KR0128094B1 publication Critical patent/KR0128094B1/en

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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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

내용 없음No content

Description

토목건설기계용 유압회로Hydraulic circuit for civil construction machinery

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명에 관한 토목건설기계용 유압회로의 한실시예를 나타내는 유압계통도. 제2도는 제1도에 있어서 유압회로에 사용되는 파일럿첵밸브(pilot check valve)의 한 구성예를 나타내는 요부구조단면도. 제3도는 제2도에 있어서 파일럿첵밸브의 변형예를 나타내는 요부구조단면도.1 is a hydraulic system showing an embodiment of a hydraulic circuit for civil construction machinery according to the present invention. FIG. 2 is a sectional view showing the principal parts of a structural example of a pilot check valve used in a hydraulic circuit in FIG. 3 is a sectional view showing the principal parts of a structural example of a pilot check valve in FIG.

Claims (2)

유압펌프와, 이유압펌프에서의 압력유에 의해서 구동되는 복수의 액튜에이터와, 상기 유압펌프에서 상기 액튜에이터로 공급되는 압력유의 방향 및 유량을 제어하는 복수의 방향절환밸브와, 상기 액튜에이터의 자연강하를 방지하도록 적절히 부착된 파일럿첵밸브로 이루어진 토목 건설기계용 유압회로로 이루어지고, 어느것인가의 액튜에이터와 이것을 제어하는 제1의 방향절환밸브 사이에 제1의 파일럿첵밸브를 붙이고, 상기의 제1의 방향절환밸브가 중립에 있을때 상기의 액튜에이터에 이상고압을 발생시키는 제2의 방향절환밸브와 이것에 의해 제어되는 다른 액튜에이터 사이에 제2의 파일럿첵밸브를 설치하고, 상기 제1 및 제2의 방향절환밸브를 조작할 경우, 상기 각 방향절환밸브에 접속된 액튜에이터가 작동개시전에 상기 각 파일럿첵밸브를 해제하도록 회로를 구성함을 특징으로 하는 토목 건설 기계용 유압회로.A hydraulic pump, a plurality of actuators driven by the pressure oil in the weaning pressure pump, a plurality of direction switching valves for controlling the direction and flow rate of the pressure oil supplied from the hydraulic pump to the actuator, and the natural drop of the actuator are prevented. Consisting of a hydraulic circuit for civil construction machinery, consisting of a pilot valve, suitably attached so that a first pilot valve is attached between any of the actuators and the first directional valve that controls it, and the first direction A second pilot check valve is provided between the second direction switching valve that generates abnormal high pressure in the actuator when the switching valve is in a neutral position, and the other actuator controlled by the second valve, and the first and second direction switching. When operating the valve, the actuator connected to each of the directional control valves must be closed before the start of operation. Hydraulic circuit for civil construction machinery, characterized in that the circuit is configured to exclude. 제1항에 있어서, 파일럿첵밸브의 개폐는, 대응하는 방향절환밸브의 개폐에서 열릴때에는 빨리 동작하고, 닫길때에는 지연동작하도록 설정함을 특징으로 하는 상기 토목 건설기계용 유압회로.2. The hydraulic circuit for civil construction machinery according to claim 1, wherein the opening and closing of the pilot valve is set such that the opening and closing of the pilot valve is performed quickly when opening and closing of the corresponding direction switching valve, and delayed when closing. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019890006775A 1988-05-20 1989-05-20 Oil-pressure control circuit of construction machine KR0128094B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63123338A JP2675066B2 (en) 1988-05-20 1988-05-20 Hydraulic circuits for civil engineering and construction machinery
JP63-123338 1991-05-20

Publications (2)

Publication Number Publication Date
KR890017431A true KR890017431A (en) 1989-12-16
KR0128094B1 KR0128094B1 (en) 1998-04-08

Family

ID=14858096

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019890006775A KR0128094B1 (en) 1988-05-20 1989-05-20 Oil-pressure control circuit of construction machine

Country Status (2)

Country Link
JP (1) JP2675066B2 (en)
KR (1) KR0128094B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0288825A (en) * 1988-09-26 1990-03-29 Yutani Heavy Ind Ltd Hydraulic circuit of construction machinery

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62140204U (en) * 1986-02-28 1987-09-04
JPS635057U (en) * 1986-06-30 1988-01-13

Also Published As

Publication number Publication date
KR0128094B1 (en) 1998-04-08
JP2675066B2 (en) 1997-11-12
JPH01295928A (en) 1989-11-29

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