Title:
DRILL BODY
Document Type and Number:
WIPO Patent Application WO/2020/042846
Kind Code:
A1
Abstract:
A drill body, which comprises: a hollow transmission shaft (1); and a hollow drill rod (3) being axially sheathed on the hollow transmission shaft (1) and integrally rotating along with the hollow transmission shaft (1), wherein an upper discharge port (121) and a lower discharge port (122) are formed in the hollow transmission shaft (1) at intervals in an axial direction; the hollow drill rod (3) is provided with an upper nozzle (31) and a lower nozzle (32) at intervals in the axial direction; the hollow drill rod (3) can axially reciprocate relative to the hollow transmission shaft (1), and the lower discharge port (122) is in communication with the lower nozzle (32) when drilling in; and when drilling out, the upper discharge port (121) is in communication with the upper nozzle (31).
Inventors:
ZHOU ZHAODI (CN)
Application Number:
PCT/CN2019/098082
Publication Date:
March 05, 2020
Filing Date:
July 29, 2019
Export Citation:
Assignee:
ZHOU ZHAODI (CN)
International Classes:
E21B17/00; E02D5/46
Domestic Patent References:
| WO2014055049A2 | 2014-04-10 | |||
| WO2011056162A2 | 2011-05-12 |
Foreign References:
| CN209025075U | 2019-06-25 | |||
| CN104032733A | 2014-09-10 | |||
| CN107939296A | 2018-04-20 | |||
| CN104674798A | 2015-06-03 | |||
| CN104988910A | 2015-10-21 | |||
| JP4894042B2 | 2012-03-07 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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