本文建立了同时考虑钢丝绳长度差及绳轮半差时的弹性衬垫磨损的微分方程式；并由此得到了衬垫绳槽稳定磨损的条件；
The paper establishes the general differential equations about elastic liner wear problem of mult-rope friction hoist considering the differences of rope's length and rope grooves.
检查钢丝绳，若发现钢丝绳在一个搓绕节距长度内折断根数超过6根时，需更换新的钢丝绳。
Check the steel rope. If the broken number exceeds 6 within a lay length, a new steel rope will be needed.
当钢丝绳上的10倍直径长度范围内断丝根数大于总数的5%时，必须更换钢丝绳。
When the breaking amount of wire in the 10 times of the wire rope diameter has surpassed 5%, you should change the wire rope.
当钢丝绳使用到最大长度时，卷筒上钢丝绳剩余量不得少于3圈。
When the wire rope being used to the largest length, the wire rope left on the roller is no less than 3 rings.
双阶梯卷筒是一种带有阶梯法兰盘和双阶梯截面的综合式卷筒，可在变幅机构的非工作区段使钢丝绳多层卷绕，以缩短卷筒长度；
Double step drum is an integral drum with stepwise flanges and double step sections. It allows the multiple layer rope winding in non-operating portion of luffing mechanism to make drum shorter.
钢丝绳通过该计长仪即可测量出钢丝绳的长度，对钢丝绳的生产工艺流程无影响。
When the steel wire rope passing the instrument, its length is obtained. And there is no effect on the technological process.
钢丝绳通过该计长仪即可测量出钢丝绳的长度，对钢丝绳的生产工艺流程无影响。
When the steel wire rope passing the instrument, its length is obtained. And there is no effect on the technological process.
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