| 摘要 |
FIELD: mining. ^ SUBSTANCE: proposed support of drilling bit includes trunnion with cutter, between which there installed is sealing assembly with O-rings. Sealing assembly is made in the form of sleeve with annular bores on inner surface for O-rings and annular groove on outer surface for arrangement of volatile material; at that, annular groove is connected to annular bores by means of radial channels. O-rings are provided with a cavity on outer surface; at that, cavity is interconnected with radial channels of housing of sealing assembly. There provided is version of hollow design of O-rings with radial channels equipped with sleeves for connection to walls of radial channels of the housing; at that, sleeves are provided with expanded head which is installed on the side of outer surface of housing of sealing assembly. ^ EFFECT: simpler design and lower manufacturing cost of support and bit as a whole. ^ 4 cl, 3 dwg |
