In the lifting mechanism of cranes, to solve the problem of layer-overlapping and direction change of the cable wound on the drum, a section of transitional boss of certain form and dimensions is currently pro-vided at the end of the spiral cable groove.

• 在起重机械的起升机构中,钢丝绳在卷筒上缠绕时升层和换向的问题,目前是在螺旋绳槽尾部设置一段有一定形状和尺寸过渡凸台。