| 摘要 |
FIELD: mining industry. ^ SUBSTANCE: blocking assembly for blocking outer tubular element with inner tubular element passes through outer tubular element and contains blocking frame, connected to one tubular element and made with recess, directed towards other tubular element and having at least one side surface bent inwards. Blocking element is positioned between tubular elements with blocking connection to other tubular element and mounted with possible passing into recess and action between retracted state, in which blocking element is moveable relatively to recess, and extended state, in which blocking element is extended to side surface bent inwards. Drive for extending blocking element in recess to side surface bent inwards is enclosed. Blocking element includes first portion and second portion, having opportunity to rotate relatively to first portion around the rod, passing in circular direction, and is mounted with possible effect between retracted state and extended state via rotation of said portions relatively to each other. ^ EFFECT: higher reliability. ^ 10 cl, 5 dwg |
