JPS57127028A - Hydraulic circuit for loading shovel - Google Patents

Hydraulic circuit for loading shovel

Info

Publication number
JPS57127028A
JPS57127028A JP1013181A JP1013181A JPS57127028A JP S57127028 A JPS57127028 A JP S57127028A JP 1013181 A JP1013181 A JP 1013181A JP 1013181 A JP1013181 A JP 1013181A JP S57127028 A JPS57127028 A JP S57127028A
Authority
JP
Japan
Prior art keywords
cylinder
switch valve
rod
boom
lines
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
JP1013181A
Other languages
Japanese (ja)
Other versions
JPS6245926B2 (en
Inventor
Takashi Yagyu
Takeshi Yamaguchi
Sotaro Tanaka
Yasuo Sakaki
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.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery 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 Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP1013181A priority Critical patent/JPS57127028A/en
Publication of JPS57127028A publication Critical patent/JPS57127028A/en
Publication of JPS6245926B2 publication Critical patent/JPS6245926B2/ja
Granted legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

PURPOSE:To eliminate the need to raise a boom in case a bucket returns to an excavation start position, by a method wherein a switch valve is mounted at lines for connecting together a level cylinder and boom cylinder, and the switch valve is shut off at a time when a rod of an arm cylinder contracts. CONSTITUTION:A switch valve 21 is situated between lines 10 and 11 connecting together a level cylinder 9 and a boom cylinder 6. The switch valve 21 is changed over to a switching position (m) through reception of a pilot pressure signal from a line (a), and is kept in a switching position (n) where no pilot pressure signal is inputted. In order to return a bucket to an excavating start position through contraction of a rod of an arm cylinder 7 after soil is unloaded from the bucket, the switch valve 21 is kept in the switching position (n), the lines 10 and 100 are shut off, and a rod side oil chamber 9A and a bottom side oil chamber 6A are connected to a tank 16. This prevents generating of oil pressure in an oil chamber 9B even through the contraction of the rod of the cylinder 7, exerts no influence on the cylinder 6, and prevents a boom 3 from being raised.
JP1013181A 1981-01-28 1981-01-28 Hydraulic circuit for loading shovel Granted JPS57127028A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1013181A JPS57127028A (en) 1981-01-28 1981-01-28 Hydraulic circuit for loading shovel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1013181A JPS57127028A (en) 1981-01-28 1981-01-28 Hydraulic circuit for loading shovel

Publications (2)

Publication Number Publication Date
JPS57127028A true JPS57127028A (en) 1982-08-07
JPS6245926B2 JPS6245926B2 (en) 1987-09-29

Family

ID=11741726

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1013181A Granted JPS57127028A (en) 1981-01-28 1981-01-28 Hydraulic circuit for loading shovel

Country Status (1)

Country Link
JP (1) JPS57127028A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072539A2 (en) * 1981-08-18 1983-02-23 Hitachi Construction Machinery Co., Ltd. Hydraulic circuit of hydraulic power shovel
JPS6175132A (en) * 1984-09-20 1986-04-17 Sekitan Rotenbori Kikai Gijutsu Kenkyu Kumiai Hydraulic circuit for loading shovel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072539A2 (en) * 1981-08-18 1983-02-23 Hitachi Construction Machinery Co., Ltd. Hydraulic circuit of hydraulic power shovel
JPS6175132A (en) * 1984-09-20 1986-04-17 Sekitan Rotenbori Kikai Gijutsu Kenkyu Kumiai Hydraulic circuit for loading shovel

Also Published As

Publication number Publication date
JPS6245926B2 (en) 1987-09-29

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