Patent ID: 11897737
Assignee: nan
Field: Mechanical elements (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 7:
8. The winch according to claim 1, wherein each of the two ends of the drum (3) is provided with a brake (4) including a normally closed brake (4.1) and a normally open brake (4.2); a driving shaft normally-open brake (4.3) is arranged at the extending end part of the right shaft of the driving shaft (2.3);
and the end cover of the winding drum (3) is provided with a permanent magnet, concave-convex teeth or a grating (3.4), and the rack (5) is provided with a turn number sensor (6.6) for detecting the number of turns of the winding drum in the positive and negative directions and controlling the upper and lower limit positions of the lifting hook; a rotation speed sensor (6.7) is arranged to detect the rotation speed of the winding drum, and when the rotation speed of the winding drum reaches or exceeds a set value, the microcomputer and the PLC automatically control the winding drum normally-open brake (4.2) and the driving shaft normally-open brake (4.3) to brake.