钢丝绳股内钢丝弯曲张力有限元分析

摘要

提升钢丝绳绕过天轮弯曲时,会导致股内钢丝张力发生变化,从而影响钢丝绳的使用寿命.以1+6型钢丝绳绳股为研究对象,应用有限元方法对绳股弯曲进行了仿真,得到了在不同包角下股内各丝张力沿接触弧长的分布.结果表明:绳股与天轮的接触弧长等于绳股捻距整数倍时,股内钢丝弯曲张力变化幅度最小;接触弧长等于捻距整数倍加上捻距一半时,弯曲张力变化幅度最大;中心钢丝的弯曲张力随着接触弧长的增大而缓慢减小.通过调整天轮与绳股的接触弧长为捻距的整数倍,可降低股内钢丝张力变化幅度,延长钢丝绳的使用寿命.研究结果为提升机包角的选取提供了理论依据.%Tension in wire rope strand will vary while the wire rope wraps around the hoist sheave and bends, which could affect the service life of wire rope.Taking the 1+6 type wire rope strand model as the research object in it,wire rope strand bending is simulated by the finite element method, and tension distribution of wire rope strand with different wrap angle is obtained.The results show that the bending tension variation in strand wires is in minimum while the contact arc length of the hoist sheave is equal to integer multiple of the wire strand lay length; the bending tension variation in strand wires is in maximum while the contact arc length of the hoist sheave is equal to integer multiple and a half of the lay length.Tension in internal wire of strand decreases with increasing of contact arc length.When the contact arc length of the hoist sheave equals to integer multiple of the wire rope lay length,it could reduce bending tension variation in wires and increase service life of wire rope.Research results provide theoretical support for choosing hoist wrap angle.