| 摘要 |
FIELD: oil and gas production. ^ SUBSTANCE: device includes external fixed housing in which there installed is electric motor with reducing reduction gear, screw gear, upper and lower movable housings with pinion racks, in each of which there installed is a pair of spring-loaded wedging cams; at that, the other pair is turned through 90 relative to longitudinal axis of the device; folding mechanism of lower pair of cams by means of rack, axis with gear quadrant, which is fixed on movable insert; in lower movable housing there made is cam slot, low pair of cams is fixed on the axis in movable insert. ^ EFFECT: improving reliability, increasing pulling force, increasing movement speed. ^ 2 dwg |
