What is the scrap standard of crane wire rope?
Release time:
2022-01-24
(1) According to the GB6067-85 standard, when the safety factor is less than 6, the number of scrapped broken wires of the alternating twisted steel wire rope is about 10% of the total number of steel wires of the steel wire rope. When the safety factor is 6~7, the number of scrapped broken wires is about 12% of the total number of steel wires of the steel wire rope. When the safety factor is greater than 7, the number of scrapped broken wires is about 14% of the total number of steel wires of steel wires, the number of scrapped broken wires of the same-direction twisted wire rope is half of the number of scrapped broken wires of the alternating twisted wire rope.
What is the scrap standard of crane wire rope?
Answer: the scrap standard of wire rope has the following points:
(1) According to the GB6067-85 standard, when the safety factor is less than 6, the number of scrapped broken wires of the alternating twisted steel wire rope is about 10% of the total number of steel wires of the steel wire rope. When the safety factor is 6~7, the number of scrapped broken wires is about 12% of the total number of steel wires of the steel wire rope. When the safety factor is greater than 7, the number of scrapped broken wires is about 14% of the total number of steel wires of steel wires, the number of scrapped broken wires of the same-direction twisted wire rope is half of the number of scrapped broken wires of the alternating twisted wire rope.
The scrap standard for the number of broken wires of the wire rope can also be based on the data proposed in the GB5972-76 "Practical Code for Inspection and Scrapping of Wire Ropes for Lifting Machinery.
(2) When the radial wear or corrosion of the steel wire exceeds 40% of the original diameter, the steel wire rope should be scrapped. When it is not more than 40%, according to the GB6067-85 standard, the number of scrapped broken wires shall be reduced according to the percentage of steel wire surface wear or corrosion, according to the reduction coefficient specified in the standard, and scrapped according to the number of broken wires after reduction.
(3) The number of scrapped broken wires of steel wire ropes for lifting hot metals or dangerous goods shall be half of the number of scrapped broken wires of general lifting steel wire ropes. This includes reduction of wire surface wear and corrosion.
(4) The whole wire rope is broken and should be scrapped.
(5) The diameter of the wire rope shall be reduced by 7% and shall be scrapped.
(6) The appearance inspection of the steel wire rope shall find any of the following situations and shall be scrapped: the hemp core is exposed; Obvious corrosion, dead knot, outer steel wire elongation is cage-shaped, wavy deformation amplitude is not less than 3/4 of wire rope diameter, rope strand extrusion, rope diameter local increase; Serious kink, rope diameter local serious reduction, part of the serious flattening, bending; when a recognizable color appears on the surface of the wire rope due to the action of heat or arc.
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