Title:
DRILL BIT FOR ROTARY DRILLING RIG
Document Type and Number:
WIPO Patent Application WO/2022/100029
Kind Code:
A1
Abstract:
A drill bit for a rotary drilling rig, comprising a drill barrel (1). The upper end of the drill barrel (1) is provided with a connecting portion (2), and the lower end of the drill barrel is provided with a cutting portion (3); the drill barrel (1) comprises a drill barrel body (11) and an opening-closing barrel cover (12); a notch is longitudinally formed in the side wall of the drill barrel body (11), and the open end of the notch is located on the bottom end face of the drill barrel body (11); the opening-closing barrel cover (12) is disposed at the notch, and the top of the opening-closing barrel cover (12) is rotatably connected to the drill barrel body (11) by means of a first hinge (4); the cutting portion (3) has a first connecting end (31) and a second connecting end (32) that are oppositely arranged, and the first connecting end (31) is rotatably connected to the bottom of the opening-closing barrel cover (12) by means of a second hinge (5). The opening-closing barrel cover and the cutting portion of the drill bit constitute an eccentric L-shaped structure; and when a door-shaped frame is detached from a hook, the opening-closing barrel cover is automatically separated from the drill barrel body under the action of gravity, so that sludge automatically falls off.
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Inventors:
YANG ZONGLU (CN)
CHEN XIAOWEN (CN)
ZHU YI (CN)
ZHU LIMING (CN)
WU NINGLIN (CN)
XIE YI (CN)
WANG XI (CN)
LI DONG (CN)
CHEN QIANG (CN)
LI XUAN (CN)
LIU YONGLI (CN)
CHEN XIAOWEN (CN)
ZHU YI (CN)
ZHU LIMING (CN)
WU NINGLIN (CN)
XIE YI (CN)
WANG XI (CN)
LI DONG (CN)
CHEN QIANG (CN)
LI XUAN (CN)
LIU YONGLI (CN)
Application Number:
PCT/CN2021/091117
Publication Date:
May 19, 2022
Filing Date:
April 29, 2021
Export Citation:
Assignee:
THE CONSTRUCTION ENG COMPANY OF CTCE GROUP (CN)
CHINA TIESIJU CIVIL ENG GROUP CO LTD (CN)
WUXI XINLIANG MACHINERY MFT CO LTD (CN)
CHINA TIESIJU CIVIL ENG GROUP CO LTD (CN)
WUXI XINLIANG MACHINERY MFT CO LTD (CN)
International Classes:
E21B10/42
Foreign References:
| CN112267839A | 2021-01-26 | |||
| CN111173455A | 2020-05-19 | |||
| CN210033286U | 2020-02-07 | |||
| CN109989705A | 2019-07-09 | |||
| CN211314115U | 2020-08-21 | |||
| JP2013204405A | 2013-10-07 | |||
| JPH0626031A | 1994-02-01 |
Other References:
See also references of EP 4026982A4
Attorney, Agent or Firm:
HEFEI TIANMING PATENT OFFICE (GENERAL PARTNERSHIP) (CN)
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