JPS57197335A - Oil-pressure circuit for oil-pressure shovel - Google Patents

Oil-pressure circuit for oil-pressure shovel

Info

Publication number
JPS57197335A
JPS57197335A JP8034281A JP8034281A JPS57197335A JP S57197335 A JPS57197335 A JP S57197335A JP 8034281 A JP8034281 A JP 8034281A JP 8034281 A JP8034281 A JP 8034281A JP S57197335 A JPS57197335 A JP S57197335A
Authority
JP
Japan
Prior art keywords
oil
turning
pressure
control valve
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.)
Granted
Application number
JP8034281A
Other languages
Japanese (ja)
Other versions
JPS6337213B2 (en
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 JP8034281A priority Critical patent/JPS57197335A/en
Publication of JPS57197335A publication Critical patent/JPS57197335A/en
Publication of JPS6337213B2 publication Critical patent/JPS6337213B2/ja
Granted 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 efficiency of turning control for an oil-pressure shovel by using a system in which the supply of oil to a turning motor or the discharge of oil fromthe turning motor is controlled by switching a turning direction control valve by lever operation and also an oil-pressure pump is put into on- load by switching an unload circuit control valve. CONSTITUTION:At the time of turning acceleration, the secondary side pressure of a remote control valve is controlled by an operating angle to the direction of arrow (a) of a lever 61, the opening area of a turning direction control valve 51 is controlled according to the secondary side pressure, the opening area of an unload circuit control valve 45 is also controlled likewise, and the supplying pressure and flow rate of oil to a turning motor M3 from an oil-pressure pump P2 are controlled. Thus, when the operating angle to the direction of arrow (a) of the lever 61 is small, the supplying pressure of oil to the motor M3 is reduced and the turning is accelerated under low pressures, and also when the operating angle is increased, the turning is accelerated under high pressures. Control can be attained by operating the lever 61 during the turning acceleration period.
JP8034281A 1981-05-26 1981-05-26 Oil-pressure circuit for oil-pressure shovel Granted JPS57197335A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8034281A JPS57197335A (en) 1981-05-26 1981-05-26 Oil-pressure circuit for oil-pressure shovel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8034281A JPS57197335A (en) 1981-05-26 1981-05-26 Oil-pressure circuit for oil-pressure shovel

Publications (2)

Publication Number Publication Date
JPS57197335A true JPS57197335A (en) 1982-12-03
JPS6337213B2 JPS6337213B2 (en) 1988-07-25

Family

ID=13715581

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8034281A Granted JPS57197335A (en) 1981-05-26 1981-05-26 Oil-pressure circuit for oil-pressure shovel

Country Status (1)

Country Link
JP (1) JPS57197335A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6412106A (en) * 1987-07-06 1989-01-17 Kayaba Industry Co Ltd Priority operation control device for high-load actuator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6412106A (en) * 1987-07-06 1989-01-17 Kayaba Industry Co Ltd Priority operation control device for high-load actuator

Also Published As

Publication number Publication date
JPS6337213B2 (en) 1988-07-25

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