Title:
BOOM CYLINDER CONTROL CIRCUIT FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2013/100458
Kind Code:
A1
Abstract:
The present invention relates to a boom cylinder control circuit for a construction machine, comprising: a boom cylinder which includes an ascending-side chamber and a descending-side chamber; a boom control unit which provides the boom cylinder with working fluid; a boom operation part which provides the boom control unit with pilot working fluid to operate the boom operation part to drive the boom cylinder; a first floating valve which selectively connects or disconnects each of the ascending-side chamber and descending-side chamber with a first drain line; a second floating valve which is additionally provided in a flow path between the descending-side chamber connected with the first drain line via the first floating valve and the first drain line to either connect the descending-side chamber with the first drain line, or to disconnect the discharge of working fluid from the descending-side chamber to the first drain line and to enable backward flowing; and a floating selection operation part (10) which provides an operation signal to switch the first floating valve and second floating valve in a connection or disconnection direction.
Inventors:
SOHN WON SUN (KR)
Application Number:
PCT/KR2012/010976
Publication Date:
July 04, 2013
Filing Date:
December 18, 2012
Export Citation:
Assignee:
DOOSAN INFRACORE CO LTD (KR)
International Classes:
F15B13/02; E02F9/22; F15B21/08
Foreign References:
| KR20100056087A | 2010-05-27 | |||
| KR200333340Y1 | 2004-03-18 | |||
| KR100588285B1 | 2006-06-09 | |||
| KR20100134827A | 2010-12-24 | |||
| JPH09195308A | 1997-07-29 |
Other References:
See also references of EP 2799724A4
None
None
Attorney, Agent or Firm:
HANBEOT PATENT LAW FIRM (KR)
특허법인 한벗 (KR)
특허법인 한벗 (KR)
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Claims: