JPS57201435A - Oil-pressure circuit for hydraulic shovel - Google Patents

Oil-pressure circuit for hydraulic shovel

Info

Publication number
JPS57201435A
JPS57201435A JP8510781A JP8510781A JPS57201435A JP S57201435 A JPS57201435 A JP S57201435A JP 8510781 A JP8510781 A JP 8510781A JP 8510781 A JP8510781 A JP 8510781A JP S57201435 A JPS57201435 A JP S57201435A
Authority
JP
Japan
Prior art keywords
control valve
turning
pressure
oil
controlled
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
JP8510781A
Other languages
Japanese (ja)
Inventor
Hideaki Yoshimatsu
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
Priority to JP8510781A priority Critical patent/JPS57201435A/en
Publication of JPS57201435A publication Critical patent/JPS57201435A/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
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
    • E02F9/12—Slewing or traversing gears
    • E02F9/121—Turntables, i.e. structure rotatable about 360°
    • E02F9/123—Drives or control devices specially adapted therefor

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)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To raise the turning controllability of an oil-pressure pump by using a system in which a turning control circuit is connected to the preference circuit of a pressure compensatory flow control valve provided to the oil-pressure pump, and the turning control valve is controlled by operating a lever. CONSTITUTION:A main control valve 4 is provided with a pressure compensatory flow control valve 42 whose preference circuit 42a is connected with a turning control valve 5. When operating a lever 61 in the direction of arrow (a), the direction control valve 51 of the turning control valve 5 is switched to a position b, the discharge oil of an oil-pressure pump P2 flows into a turning motor M3 through the pressure compensatory flow control valve 42 and the turning control valve 5, and the pressure of suction side of the turning motor M3 is gradually raised and its turning is accelerated. At this time, the secondary side pressure of a remote control valve 6 is controlled by the operating angle of the lever 61, a direction control valve 51 for turning is controlled by the secondary side pressure, and thereby the pressure and flow rate of oil coming into the turning motor M3 are controlled.
JP8510781A 1981-06-02 1981-06-02 Oil-pressure circuit for hydraulic shovel Pending JPS57201435A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8510781A JPS57201435A (en) 1981-06-02 1981-06-02 Oil-pressure circuit for hydraulic shovel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8510781A JPS57201435A (en) 1981-06-02 1981-06-02 Oil-pressure circuit for hydraulic shovel

Publications (1)

Publication Number Publication Date
JPS57201435A true JPS57201435A (en) 1982-12-09

Family

ID=13849389

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8510781A Pending JPS57201435A (en) 1981-06-02 1981-06-02 Oil-pressure circuit for hydraulic shovel

Country Status (1)

Country Link
JP (1) JPS57201435A (en)

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