Title:
HYDRAULIC DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/025546
Kind Code:
A1
Abstract:
A crusher (9) has a switching valve (24) that switches the state of a hydraulic circuit (5) in the crusher (9) so as to: connect a second cylinder (16B) head-side chamber and a housing chamber (S1) when a crushing arm is rotated in the opening direction; connect the housing chamber (S1) and the second cylinder (16B) head-side chamber and disconnect a first cylinder (16A) head-side chamber and the second cylinder (16B) head-side chamber when the pressure inside the first cylinder (16A) head-side chamber is less than a preset set pressure while the crushing arm is rotated in the closing direction; and disconnect the housing chamber (S1) and the second cylinder (16B) head-side chamber, allow hydraulic fluid to flow from the housing chamber (S1) to the discharge side of a control valve (23), and connect the first cylinder (16A) head-side chamber and the second cylinder (16B) head-side chamber when the pressure inside the first cylinder (16A) head-side chamber is greater than or equal to the set pressure while the crushing arm is rotated in the closing direction.
Inventors:
TAKESHITA TATSUYA
Application Number:
PCT/JP2017/023929
Publication Date:
February 08, 2018
Filing Date:
June 29, 2017
Export Citation:
Assignee:
KOBELCO CONSTR MACH CO LTD (JP)
International Classes:
E04G23/08; B02C1/06; E02F9/22; F15B11/02; F15B11/024; F15B21/14
Foreign References:
| JPH01207571A | 1989-08-21 | |||
| JP2010242435A | 2010-10-28 | |||
| US5199658A | 1993-04-06 |
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
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