Title:
SIGNAL OIL OUTPUT STRUCTURE OF IMPACT CYLINDER OF HYDRAULIC ROCK DRILL
Document Type and Number:
WIPO Patent Application WO/2023/273225
Kind Code:
A1
Abstract:
A signal oil output structure of an impact cylinder of a hydraulic rock drill. The impact cylinder (4) is merely provided with one signal oil port (41) communicated with a control cavity (S) of a reversing valve (5); during a return stroke of an impact piston (3), the impact piston (3) completes return stroke control travel (Sc) before the left side of the signal oil port (41), and the signal oil port (41) is communicated with a piston front cavity (7); during a forward stroke of the impact piston (3), the impact piston (3) starts from the right side of the signal oil port (41) and completes forward stroke control travel (Sic), and the signal oil port (41) is communicated with a piston middle cavity (8).
Inventors:
HE QINGHUA (CN)
DING HEJIANG (CN)
SONG LEI (CN)
DING HEJIANG (CN)
SONG LEI (CN)
Application Number:
PCT/CN2021/140409
Publication Date:
January 05, 2023
Filing Date:
December 22, 2021
Export Citation:
Assignee:
SUNWARD INTELLIGENT EQUIPMENT (CN)
International Classes:
E21B1/26; E21B41/00; E21B47/00
Foreign References:
| CN113236112A | 2021-08-10 | |||
| CN113338790A | 2021-09-03 | |||
| CN104154050A | 2014-11-19 | |||
| CN104373038A | 2015-02-25 | |||
| JPS52150303A | 1977-12-14 |
Attorney, Agent or Firm:
CHANGSHA ZONEKEY PATENT LAW FIRM (CN)
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