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. The shutoff member is equipped with blades and an unbalanced insert in peripheral part. The shutoff member is equipped on the seat side with a constant magnet located diametrically opposite to the unbalanced insert. The housing seat is equipped with an additional annular magnet. Constant magnets are oriented with their similar poles towards each other.
EFFECT: use of the proposed bit increases its operating efficiency at drilling for explosive formations.
2 dwg
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