Brake failure: collision, smashing, or equipment accident. It is necessary to check and keep the braking device flexible and effective.

Limitation failure: collision, smashing or equipment, and over -rolling accidents. It is necessary to check frequently to maintain the flexible and effective limit of the limit device.

The wire rope is defective: the hanging object is damaged or the equipment is damaged. It is necessary to check frequently, and it is found that there are severe filaments, twisting, and serious rust.

Hanging (or someone): Personal damage. The evacuation personnel before hanging, the hanging object cannot be passed by the top of someone.

Error operation: collision, smashing, or equipment accident. It is necessary to operate in accordance with the specifications.

Overload: Crane rollover, falling injury or equipment damage. Stay on the rated load.

Failure of zero place: an electric shock accident. Put the leakage protection device; the grounding of zero ground must be intact.