Title:
HYDRAULIC HAMMER AND CONSTRUCTION APPARATUS COMPRISING SAME
Document Type and Number:
WIPO Patent Application WO/2018/021642
Kind Code:
A1
Abstract:
The present invention relates to a hydraulic hammer and a construction apparatus comprising same, the hydraulic hammer comprising: a cylinder; a piston; a backward port connecting a front chamber of the cylinder to a hydraulic source; a forward port formed on a rear chamber of the cylinder; a forward/backward valve for controlling the forward and backward movement of the piston; a control line for moving the forward/backward valve to a forward-movement location; a long-stroke port formed between the forward port and the backward port; a short-stroke port formed between the backward port on the cylinder and the long-stroke port; a shift valve disposed between the short-stroke port and the control line; a proximity sensor for detecting a bottom dead center of the piston upon the stroke on an object; and a controller for determining a striking condition on the basis of the detected bottom dead center, and transmitting a control signal to the shift valve.
Inventors:
JOO JIN MOO (KR)
PARK YONG SHIK (KR)
LIM HOON (KR)
YOON BOK JOONG (KR)
PARK YONG SHIK (KR)
LIM HOON (KR)
YOON BOK JOONG (KR)
Application Number:
PCT/KR2017/001318
Publication Date:
February 01, 2018
Filing Date:
February 06, 2017
Export Citation:
Assignee:
DAEMO ENG CO LTD (KR)
KOCETI (KOREA CONSTRUCTION EQUIPMENT TECH INSTITUTE) (KR)
KOCETI (KOREA CONSTRUCTION EQUIPMENT TECH INSTITUTE) (KR)
International Classes:
E02F3/96; B25D9/04; E02D7/10; E02F5/30; E02F9/22
Domestic Patent References:
| WO2011077001A1 | 2011-06-30 |
Foreign References:
| KR20160015487A | 2016-02-15 | |||
| JPH0842277A | 1996-02-13 | |||
| KR20150036848A | 2015-04-08 | |||
| KR101550899B1 | 2015-09-08 |
Other References:
See also references of EP 3492660A4
Attorney, Agent or Firm:
IPS PATENT FIRM (KR)
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