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The cable drum of a hydraulic motor type crane is a device that uses a hydraulic motor as the driving source to automatically retract and release cables, and provides power supply for wet spraying machine operation through a collector ring.

It is a device that uses a snail coil spring as the power source and can automatically coil power cables or signal cables. When electrical equipment (such as mobile devices such as cranes or small cars) moves, the drum is pulled to release the cable.

The cable reel of the hysteresis motor has a constant torque output, and the motor must be started synchronously with the walking mechanism of the main engine.