In operating portion, however, rope winds up in single layer, thus squeezing of rope layers is avoided and rope working life is elongated.
在工作区段,钢丝绳为单层卷绕,可避免钢丝绳的层间挤压,延长钢丝绳的使用寿命。
2
Double step drum is an integral drum with stepwise flanges and double step sections. It allows the multiple layerrope winding in non-operating portion of luffing mechanism to make drum shorter.
The axial force toward the side board is always produced when the wire rope reaches the new layer. It makes the side board bended and causes very large stress between the side board and the roller.