Liquid seal for wet roof bit

Typical for mining is connected with drill bit is adjacent to the top of a drill pile hole (52) immediately position of the high-pressure water to the detritus cooling and embedded. The invention claims a steel drill rod assembly for wet the drill bit can reduce is provided with the drill bit the loss of hydraulic. A bit body (54) (58) is connected with the steel drill rod through a middle groove chamber. The transition matched with the is provided with a button (62) is with a bit body is opened with, so that the bit body (54) is connected by a quick buckle is gathered conveniently to the drill bit assembly is. The sealing cylinder of the flexible material (56) is clamping the drill rod is matched and a transition bit body between the limiting to the loss of hydraulic.