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。
The experiment proves that this method can perfectly control the running modes such as starting, acceleration, uniform motion, slowdown and creeping of the hoist.
实验证明，该方法可更好地实现提升机的启动、加速、匀速、减速及爬行等各运行阶段的控制。
Overload protection: equipped self re-setting overload protector, the hoist motion is stopped if overloading occurs, but lowering is permitted, making the crane safe.
过载保护装置：当过载发生时，运行下降，不允许上升，便于重物安全落地。
Overload protection: equipped self re-setting overload protector, the hoist motion is stopped if overloading occurs, but lowering is permitted, making the crane safe.
过载保护装置：当过载发生时，运行下降，不允许上升，便于重物安全落地。
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