gantry crane with rope-trolley
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The spreader is linked to the crane through the rope, and its motion state is changed complicated in three-dimension with the accelerating and decelerating of trolley, hoist and gantry.
随着起重机大车、小车及起升机构的加速和减速，由钢丝绳连接的吊重的运动状态表现为一个复杂的空间运动。
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