JPS56159438A - Hydraulic circuit of construction machine with attachment - Google Patents

Hydraulic circuit of construction machine with attachment

Info

Publication number
JPS56159438A
JPS56159438A JP6232980A JP6232980A JPS56159438A JP S56159438 A JPS56159438 A JP S56159438A JP 6232980 A JP6232980 A JP 6232980A JP 6232980 A JP6232980 A JP 6232980A JP S56159438 A JPS56159438 A JP S56159438A
Authority
JP
Japan
Prior art keywords
change
over
valve
attachment
pressure oil
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.)
Pending
Application number
JP6232980A
Other languages
Japanese (ja)
Inventor
Taiji Kudo
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.)
Japan Steel Works Ltd
Original Assignee
Japan Steel Works 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 Japan Steel Works Ltd filed Critical Japan Steel Works Ltd
Priority to JP6232980A priority Critical patent/JPS56159438A/en
Publication of JPS56159438A publication Critical patent/JPS56159438A/en
Pending 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
    • E02F9/22—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
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance

Landscapes

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

Abstract

PURPOSE:To improve the operation speed and reduce the number of change-over valves by feeding a pressure oil from two hydraulic pumps with change-over valves for controlling attachment in the same number as that of the attachments. CONSTITUTION:When a valve 15 is turned to one position, a pressure oil of a hydraulic pump 1 is fed to an oil inlet 15a of the change-over valve 15 via a check valve 16 from a discharging pipeline 20. At the same time, the pressure oil of the other hydraulic pump is fed to the oil inlet 15a of the change-over valve 15 via a check valve 18 from a discharging pipeline 21. Consequently, the pressure oils of the hydraulic pumps all converge to the oil inlet 15a and then, fed to operate a cylinder 22a of an attachment 22. When any one of change-over valves 6, 7, 8, 12, 13 and 14 is turned from this position, the pressure oil flows to the change-over valve 15 from only one hydraulic pump. In other words, the controlling of the change-over valves 6-8 and 12-14 is preferred, which enables the feeding of the pressure oil to the change-over valve 15 when they are neutral.
JP6232980A 1980-05-13 1980-05-13 Hydraulic circuit of construction machine with attachment Pending JPS56159438A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6232980A JPS56159438A (en) 1980-05-13 1980-05-13 Hydraulic circuit of construction machine with attachment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6232980A JPS56159438A (en) 1980-05-13 1980-05-13 Hydraulic circuit of construction machine with attachment

Publications (1)

Publication Number Publication Date
JPS56159438A true JPS56159438A (en) 1981-12-08

Family

ID=13196982

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6232980A Pending JPS56159438A (en) 1980-05-13 1980-05-13 Hydraulic circuit of construction machine with attachment

Country Status (1)

Country Link
JP (1) JPS56159438A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008175055A (en) * 2005-08-24 2008-07-31 Nippon Steel Corp Steel pipe pile with recess and composite steel pipe pile using it

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008175055A (en) * 2005-08-24 2008-07-31 Nippon Steel Corp Steel pipe pile with recess and composite steel pipe pile using it

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