The down the hole drilling rig is an impact rotary drilling rig, and its internal structure is different from that of a general rock drill. Its gas distribution and piston reciprocating mechanism are independent, namely the impactor. Its front end is directly connected to the drill bit, and its rear end is connected to the drill rod. During rock drilling, the impactor penetrates into rupa i, kroz ventil, klip (čekić) unutar udaraca kreće se naprijed-nazad kako bi udario rep bušilice, uzrokujući da bušilica utječe na stijenu na dnu rupe . velika brzina rotacije unutar rupe postiže se zasebnim mehanizmom rotacije, prolaznog motora ili pneuma Utjecaj . stijenski prah nastao tijekom bušenja stijena izbačen je iz rupe mješavinom vjetra i vodenog plina . Mješoviti plin ubrizgava se u udarcu kroz središte bušilice mehanizmom pražnjenja, a zatim na dno {{{{{{{jpča
