DEVICE FOR DRILLING Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: drilling device includes drilling column, turbodrill with a trepan secured on its shaft, heavy drill pipes, and feed mechanism made in the form of hollow body and a piston placed in body cavity. The piston has a rod installed so to move in axial direction and fixed against turning about the body. Underpiston cavity of feed mechanism is communicated with drill column cavity. Overpiston cavity is communicated with beyond pipe space. Heavy drill pipes are installed over turbodrill. Feed mechanism body is connected to drill column. The piston with rod is connected with heavy drill pipes. Turbine stators of the turbodrill are made in the form of two series blade-type crowns. Blades of the first one are located at 30 to 50 angle, the blades of the second one are installed at the angle of 40 to 75 to the plane perpendicular to turbodrill axis. EFFECT: high productivity. 3 dwg