DRILL BIT Russian patent published in 2005 - IPC

FIELD: rock crushing tools; methods of fitting ejection hydraulic giant tips for erosion breaking of rock by sludge pulp.

SUBSTANCE: proposed drill bit has body with connecting thread, rock rollers mounted on trunnions of lugs at inclination relative to longitudinal axis of drill bit by means of bearings; drill bit is also provided with sintered-carbide ejection type hydraulic giant tips which are brought to face at distance δ equal to three or four calibrated diameter of tip but not below depth of rock roller tooth; they are located in washing passages of drill bit by the following scheme: first - by radius over drill bit periphery at angle of inclination to longitudinal axis of drill bit of 5-7 deg.; second - in center of drill bit radius and third - in center at shift of axis of ejection hydraulic giant tip relative to longitudinal axis of drill bit by magnitude "a" of calibrated diameter of tip.

EFFECT: increased mechanical speed of drilling; enhanced operational efficiency.

5 dwg