Then the structural accident of total section drive-through type crack is caused in arch frame top chord, which is induced by hoisting and detection using pulley arbitrarily.
铜绿山矿某三铰拱屋架单轨吊梁结构体系，因技术改造增加设备简体重量，随意用滑轮组起吊检修，导致拱架上弦全截面贯通式开裂的结构事故。
Pulley through cable is set at the top of shell and sealing equipment is set between cable and shell.
壳体顶部设置有通过缆绳的滑轮，缆绳与壳体之间设置有密封装置。
The rails pass up to the top of the shaft, where they are taken over a pulley which can be driven in either direction by an electric motor.
导轨直通到升降井顶部。钢丝绳在顶部绕过一个滑轮。滑轮由电动机驱动可向任一方向转动。
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