Rope drum is a part of crane lifting gear. One or more ropes are unwinding from the rope drum body (depending on type of rope gearing), when subsequently the rope passes through the sheave set of the lifting gear.
Rope drum
Use of rope drum on typical crane lift
Groove for rope
Crane rope drum
In most cases, the drum is mounted on one side in the drum bearing and on another side on the output shaft of gear box over the rope coupling, which can to a certain extent eliminate the incorrectness of lifting gear adjustment.
Detail of rope drum connection to gear box
