SELECTION AND VALIDATION OF SMALL-DIAMETER DTH AIR HAMMERS

Small diameter drilling is widely used in modern-stage mining. Such holes are employed for exploration, hydrogeological, seismic, structural, blasting and observation purposes, as well as for rock bolting. Current technologies of underground mining often require small-diameter drilling. This article reasons in favor of engineering rotary–percussion machines for drilling holes 40–60 mm in diameter. Towards this objective, a drilling rig with a DTH air hammer is designed and manufactured. The structural layout of the small-diameter air hammer drill with the highest blow energy is substantiated. The air hammer is debugged using mathematical model and advanced software. The penetration rates of the small-diameter air hammer in rocks of different hardness are obtained in the experimental tests. The ranges of rotation speed and feed force of drilling rod on the bottomhole, such that the maximum penetration rate is achieved, are determined.

Keywords

Rotary–percussion drilling, DTH air hammer, structural layout, experimental tests, brassboard.

Issue number: 11
Year: 2018
ISBN:
UDK: 622.233
DOI: 10.25018/0236-1493-2018-11-0-145-153
Authors: Shahtorin I. O.

About authors: Shahtorin I.O., Junior Researcher, e-mail: Scorpion22@bk.ru, Chinakal Institute of Mining of Siberian Branch of Russian Academy of Sciences, 630091, Novosibirsk, Russia.

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