| 摘要 |
FIELD: mining.SUBSTANCE: invention relates to washing units of rock destructing tool of the water jet type. Flushing assembly of drilling bit includes housing with channel and seat and nozzle with sealing element fixed by retainer. Retainer is composed of several stepped rods with collet working head step of larger diameter of which is located on side of output end of nozzle, nozzle is made with through axial channels reciprocal aligned which in housing from bottom of seat there is a circular bore for arrangement of collet heads rods. At that, in circular borings under large bases of collet bushings are installed hollow toroid elastic elements to hold retainers in uppermost position, made with radial channel equipped with spring-loaded check valve and communicated with discharge channel.EFFECT: technical result consists in improvement of efficiency of flushing unit.1 cl, 2 dwg |
