ANCHOR TIGHTENING DEVICE

摘要

FIELD: mining; applicable in mine working bolting. SUBSTANCE: anchor tightening device includes three-stage nut: the first stage is cylindrical, the second stage-pressing one is conical in shape with angle of cone inclination less than friction angle between nut and washer; the third stage-tightening stage whose shape provides for its tightening by required tool. Washer is made with flat base on face and with two-stage holes, one stage is cylindrical and the second stage is conical congruent to conical surface of nut. EFFECT: higher strength of anchor tightening device. 1 dwg