The drum diameter not less than 19 times of the wire rope diameter.

The drum wall can withstand the wrapped tight force of wire rope; the side can withstand the lateral force produced by wire rope.

The distance between drum side plate peripheral to the outermost roll rope not less than twice of the wire rope diameter.

1. The wire ropes on the crane drum should be arranged neatly. If overlap and oblique winding are found, they should be stopped and rearranged. It is forbidden to pull the wire rope by hand or foot in rotation. The wire rope shall not be completely released, at least three laps shall be reserved.
2. crane wire rope is not allowed to knot, twist, in a pitch break more than 10%, should be replaced.
3. In the crane operation, no one shall cross the wire rope, and the operator shall not leave the hoist after the object (object) is lifted. Objects or cages should be lowered to the ground when resting.
4. In the operation, the driver and signalman should maintain good visibility with the lifting object. The driver and signalman should cooperate closely and obey the unified command of the signal.
5. In case of power failure during crane operation, the power supply should be cut off and the lifting object should be lowered to the ground.

a.Crane machinery: The bridge lifting machine, Tower crane, Gantry crane, Crawler crane winch, etc
b,The petroleum industry: Oil drilling rig, Petroleum tractor hoist, Petroleum workover rig, Trailer mounted pumping unit winch , Logging winch, etc
c.Offshore Marine machinery: Offshore petroleum crane winch, Mooring winch, Traction winch, Man-riding winch, Anchor winch, Hydraulic winch, etc
d. The construction machinery: Building wipe wall winch, Winding hoist, Windlass, etc
e. Engineering machinery: Cable winch, Tower crane, Piling machine, Hydraulic winch, etc
f. Mining winch: Dispatching winch, Prop-pulling winch, Sinking winch, etc