| 摘要 |
FIELD: mining. ^ SUBSTANCE: rotating preventer contains body with rotating trunk installed therein and fixed in bearing init; and preventer also contains packing element. The latter is made in form of a thrust ring assembled on the coupling installed on a drilling column. There is cut a groove in the thrust ring, the groove is connected with the interior surface of the coupling by means of radial channels. ^ EFFECT: increased rate of round trip operations, increased resource of packing element. ^ 2 dwg |
