Abstract:K series hydro - hammer wineline core drilling system is a kind of geological core drillingsystem successfully developed by Exploration Technology institute of MMI, including TK - Aseries positive action hydro - hammer and TK - S series wireline core drilling system. Its structure and principle are shown as Fig. 1 and Fig. 2.A piston hammer (5) is in the upper position when acted by a hammer spring (6) and itscentre bore is covered by a valve (3). Under high pressure fluid, the piston and valve make thehammer spring and valve spring move down. At the moment when the anvil will be impacted,the valve (3) has been blocked by a valve seat (2), and the valve and piston hammer have beenseparated. The valve acted by the valve spring (l) moves up to the upper position and the piston hammer continues to impact the anvil (7) with inertia. After the valve is apart from the piston, the centre bore is opened and the pressure is relieved on the upper section of the valve. Thepiston hammer begins to move up by the action of the hammer spring. When contacting withthe valve, it moves down again. In this way, the piston hammer moves in cycles to produce continuous impacts. Impacting load is transmitted by a spline mechanism to the bit at the hole bottom.In TK - S series wireline core drilling system, a positive action hydfo - hammer is mountedon an inner core barrel assembly. The impact force is given out by the percussive tool and transmitted by a vibro - transmiting ring, vibro - receiving ring and spline mechanism to the outercore barrel. Meanwhile rotation of the system to form the round cored hole.More than 3, 000 sets of TK series drilling systems have been produced. More than ten million RMB of economic benefits have been obtained by this tool with an accumulative total meterage of over 3, 000, 000m.
