| 摘要 |
FIELD: mining. ^ SUBSTANCE: invention concerns rock destruction tool. Particularly it concerns drilling bit bearing design. The drilling bit cutter contains a body with peripheral, intermediate and top crowns equipped with rock-destroying elements. The axes of the cutter crowns are positioned eccentrically relative to the longitudinal axis of the cutter with the crowns eccentricity value decreases in the direction from the top to the periphery. The first three cutter crowns beginning with the top crown in a plane perpendicular to the longitudinal axis of the cutter are displaced relative to each other by an angle of 120, where =1-5, while the eccentricity value for the first three crowns is selected in accordance with the ratio K1:K2:K3=3:2:1. ^ EFFECT: improved efficiency of rock destruction and drilling works cost reduction. ^ 3 cl, 2 dwg |
