Lifting equipment drum group is an important part. Drum group is mainly composed of the spool, the spool shaft, gear wheel over (or large gear), the reel hub, bearing body and bearings. If the lifting height when the larger, in order to reduce the size of the roll, the surface can be used with a guide spiral groove or smooth multilayer winding drum, but the rope wear faster for slow and lighter type of work, Tonnage lower crane. Steel drum group is mainly for large tonnage and high performance requirements of lifting equipment.