港口卸船机用钢丝绳冲击载荷计算模型研究

Research on impact load calculation model of wire rope for port ship unloader

港口卸船机用钢丝绳使用过程中受到较大的冲击动载荷。对运行阶段钢丝绳建立数学模型,在已知下落高度条件下,计算钢丝绳在静载荷下的伸长及冲击动载荷下的伸长。根据下落过程中能量守恒定律,定义钢丝绳冲击载荷系数的计算公式,用于判定钢丝绳在受到动载荷冲击时的安全性能,即冲击载荷系数越大,冲击载荷越大,在使用中越容易发生断股断绳现象。指出当下落高度h=0的冲击载荷,即钢丝绳在启动时,所受到的零位冲击载荷系数n0=2。

Wire rope for port ship unloader is subjected to large impact dynamic load in service. Mathematical model of wire rope in operation is established to calculate the elongation of wire rope under static load and under impact load under known drop height. According to the law of conservation of energy during the fall process, the calculation formula of impact load coefficient of wire rope is defined to determine the safety performance of wire rope when it is impacted by the dynamic load. The greater the impact load coefficient, the greater the impact load, the more likely broken the strand or rope in service. It is pointed out that the impact load of falling height h =0, when the wire rope starts, the zero impact load coefficient n 0 =2 is received.