Commonly used varieties are phosphate coated steel wire rope, galvanized steel wire rope and smooth steel wire rope.
1. During the use of the wire rope, the wire rope should be prevented from looping, kinking, bending or adhering to debris, and to prevent friction with machinery or other debris.
2. After the tower crane is installed (before use), the steel wire rope should be lubricated, and then painted with graphite grease, and then the steel wire rope should be lubricated according to the "crane lubrication table".
3. The overall design of the tower crane does not allow the wire rope to have an indefinite life. One of the following conditions should be scrapped:
a. The wire rope 6 × 19-d (d wire rope diameter) has more than 5 broken wires in 6d length and more than 10 broken wires in 30d length.
b. Wire rope 6 × 37-d (d wire rope diameter) has more than 10 broken wires in 6d length and more than 19 broken wires in 30d length.
c. The steel ropes are close together, even if the number of broken wires does not exceed 5 in the 6d length, they should be scrapped.
d. Although the wire rope is not broken, the wear of the wire rope reaches 40% of its diameter, or the wire rope is reduced by 7% or more relative to the nominal diameter, or the wire rope is significantly bent.
e. The wire rope loses its normal shape and produces deformities, such as waves, cage distortion, strand extrusion, wire extrusion, partial increase in the diameter of the rope, kinks, partial decrease in the diameter of the rope, and some of it being flattened or bent.
f. When the diameter of the steel wire rope is affected by special heat, and a recognizable color appears on the outside.
Note: When lifting molten or hot metals, acid solutions, explosives, and flammables, the number of scrapped steel wire ropes is halved.
