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Patent Searching and Data


Title:
CLOSED HYDRAULIC ROCK DRILL
Document Type and Number:
WIPO Patent Application WO/2019/120127
Kind Code:
A1
Abstract:
A closed hydraulic rock drill, comprising an outer cover (2), a bit shank sleeve (4), a drill rod (38), and a piston (9). The bit shank sleeve (4) is disposed in the outer cover (2); one end of the drill rod (38) is fixed in the bit shank sleeve (4); the piston (9) is fixed in the bit shank sleeve (4) and is fixedly connected to the drill rod (38). The closed hydraulic rock drill further comprises a hydraulic motor (18) disposed on the outer cover (2). The hydraulic motor (18) drives, by means of a transmission device, the bit shank sleeve (4) to rotate.

Inventors:
LI YONGSHENG (CN)
WANG WEILIN (CN)
YANG QI (CN)
ZHANG FENGQIN (CN)
WANG QIUJING (CN)
Application Number:
PCT/CN2018/120797
Publication Date:
June 27, 2019
Filing Date:
December 13, 2018
Export Citation:
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Assignee:
SHANDONG TIANRUI HEAVY IND CO LTD (CN)
International Classes:
E21B1/26; E21B6/04
Domestic Patent References:
WO2002101192A12002-12-19
Foreign References:
CN107905722A2018-04-13
CN107893629A2018-04-10
CN108049802A2018-05-18
CN207829802U2018-09-07
CN207829803U2018-09-07
CN105257208A2016-01-20
CN2177804Y1994-09-21
CN102937000A2013-02-20
Attorney, Agent or Firm:
BOXIN CHINA INTELLECTUAL PROPERTY (CN)
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