HYDRAULIC HAMMERING DEVICE - FURUKAWA ROCK DRILL CO LTD

Title:

HYDRAULIC HAMMERING DEVICE

Document Type and Number:

WIPO Patent Application WO/2019/022021

Kind Code:

A1

Abstract:

Provided is a hydraulic hammering device with which it is possible to achieve both an auto-stroke mechanism and an idling strike prevention mechanism with a simple circuit configuration and to easily select either of these mechanisms. This hydraulic hammering device comprises a first control valve (200) for controlling a forward/rearward motion operation of a piston (120), an auto-stroke mechanism and an idling strike prevention mechanism, and a second control valve (300) for selecting one mode from among the auto-stroke mechanism and the idling strike prevention mechanism. The second control valve (300) has a shared spool (320) slidably fitted therein and is provided with a mode selection means (400). The mode selection means (400) is such that, when pressure oil is supplied to an auto-stroke setting unit of the shared spool (320) but discharging of pressure oil from an idling strike prevention setting unit is prohibited, the auto-stroke mechanism is selected, and when the supply of pressure oil to the auto-stroke setting unit is prohibited but the discharging of pressure oil from the idling strike prevention setting unit is permitted, the idling strike prevention mechanism is selected.

Inventors:

KANEKO TSUTOMU (JP)
MURAKAMI SUSUMU (JP)
KOBAYASHI ISAO (JP)
SHIODA ATSUSHI (JP)
NAGANO SHINSUKE (JP)

Application Number:

PCT/JP2018/027543

Publication Date:

January 31, 2019

Filing Date:

July 23, 2018

Export Citation:

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Assignee:

FURUKAWA ROCK DRILL CO LTD (JP)

International Classes:

B25D9/26; B25D17/10; E21C27/12

Foreign References:

JP2003159667A	2003-06-03
JP2001315074A	2001-11-13
JPH1080878A	1998-03-31
JP2005177899A	2005-07-07
JP2016032864A	2016-03-10
US20140326473A1	2014-11-06
JPH04300172A	1992-10-23

Other References: