FIELD: mining.
SUBSTANCE: drilling bit includes a housing with a seat and flushing channels. A shutoff member is installed in the cavity of the housing by means of a vertically fixed pin. Shutoff member is equipped with blades and an unbalanced insert in peripheral part. Peculiar feature of the bit is that the shutoff member on the side of the seat is equipped with a constant magnet. Magnet is located immediately above the unbalanced insert and isolated from the shutoff member housing with a diamagnetic cover. At that, contact sections of the seat and the housing of the shutoff member have congruent shape, for example in the form of a right cone.
EFFECT: use of the proposed bit increases its operating efficiency at drilling for explosive formations.
2 dwg
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