Imagine a belt running over a pulley and catching some loose debris and forcing it around the pulley.
2
所有救生艇吊柱的滑轮和滚轮拆开检查、清洁、加油并装妥。
All sheaves and rollers of the life boat davit need to be overhauled, cleaned, greased and reassembled.
3
控制模型的目标是建立使小车和滑轮组尽快到达预定位置，并消除钢丝绳和负载由惯性所致摆角的控制方案。
A control scheme that trolley and pulley blocks can arrive at the preset positions as soon as possible and swinging Angle caused by wire rope and load inertias can be removed is obtained.
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