Title:
HYDRAULIC SYSTEM FOR WORKING MACHINE AND CONTROL METHOD THEREOF
Document Type and Number:
Japanese Patent JP2017067251
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To secure safety at the time of failure of a working machine which can be operated by both ordinary control and remote control.SOLUTION: At the time of performing ordinary control, a controller causes an SOL 3 of a second pilot valve 2 to be excited and an operator operates an operation lever 11, which causes pilot pressure corresponding to an amount of lever operation to act from a first pilot valve 1 through a selection valve 4 to a control valve 3 to thereby drive a hydraulic actuator 10. When a working machine is in a safe condition at this time, the selection valve 4 is in a state of being excited and fully opened. At the time of performing remote control, the controller causes an SOL 4 of the second pilot valve 2 to be excited and an SOL 1 or SOL 2 of the selection valve 4 as a remote control target to be excited, which causes pilot pressure supplied from the second pilot valve 2 to act through the selection valve 4 to the control valve 3, to thereby drive the hydraulic actuator 10. The selection valve 4 is configured to block the pilot pressure to the control valve 3 when not being excited.SELECTED DRAWING: Figure 1
Inventors:
SAKURAI HITOSHI
TERASAKA JOJI
SHIMOMURA KOICHI
TERASAKA JOJI
SHIMOMURA KOICHI
Application Number:
JP2015196384A
Publication Date:
April 06, 2017
Filing Date:
October 02, 2015
Export Citation:
Assignee:
KOBELCO CRANES CO LTD
International Classes:
F15B11/08; B66C13/20; E02F9/24; F15B20/00
Attorney, Agent or Firm:
Kaji/Suhara Patent Office
Previous Patent: Movable object drive
Next Patent: It is structure that a bolt nut should stop slackening.
Next Patent: It is structure that a bolt nut should stop slackening.