Title:
HYDRAULIC CONTROL DEVICE OF WORK MACHINE
Document Type and Number:
Japanese Patent JP2017008980
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a device for controlling supply of hydraulic oil from a hydraulic pump to a hydraulic actuator while suppressing an energy loss.SOLUTION: A device provided comprises: a hydraulic pilot type control valve 16; a pilot operation unit 20 which allows supply of a pilot pressure from a pilot hydraulic pressure source 18 to the control valve 16 when receiving pilot command operation; an accumulator 24 connected to a pilot line 22; an unload valve 30 provided in the pilot line 22; command operation detectors 32A, 32B for detecting the pilot command operation; and an unload control part 40 which puts the unload valve 30 in an on-load position 30a until an unload change set time passes from the time point when the command operation detectors 32A, 32B start detection of a non-operation state, and changes the unload valve 30 to an unload position 30b at the time point when the non-operation state continues for the unload change set time.SELECTED DRAWING: Figure 1
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Inventors:
IMANISHI ETSUJIRO
HORI NAOTO
SAKURAI HITOSHI
HORI NAOTO
SAKURAI HITOSHI
Application Number:
JP2015122677A
Publication Date:
January 12, 2017
Filing Date:
June 18, 2015
Export Citation:
Assignee:
KOBE STEEL LTD
KOBELCO CRANES CO LTD
KOBELCO CRANES CO LTD
International Classes:
F15B11/08; B66C13/20; B66D1/44
Domestic Patent References:
| JP2009150413A | 2009-07-09 | |||
| JP2006206205A | 2006-08-10 |
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Otani
Muramatsu Toshiro
Masataka Otani
Muramatsu Toshiro