确保电机是牢固固定一些，并认为螺旋桨可以自由摆动。
Make sure the motor is firmly fastened to something and that the propeller can swing freely.
且当行车快速水平移动时与吊具保持刚性约束，避免 吊具发生自由摆动。
The traveling crane maintains rigidity restriction with the lifting appliance in rapid horizontal shift, thus avoiding free swing of the lifting appliance.
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