How to select crane wire rope?Inquire into the procedure of wire rope selecting rationally.From such aspects as strength,anti-torsion,anti-fatigue,anti-abrasion,anti-impact,anti-corrosion and elongation of wire rope to explain the problems needing attention to in production and use,which includes structure of wire rope,production process,spooling mode etc.The use conditions and requirements offered as wire rope ordering goods are illuminated.
Machine or lifting equipment manufacturers determine the specific system used in the minimum strength of crane wire rope.Equipment manufacturers need to be familiar with local regulations, standards or regulations of practical application, points out the design factors of wire rope ,use coefficient or safety coefficient.
To select crane wire rope structure, it is important to decide whether to need to use rotate or low resistance wire rope.This kind of wire rope is general structure.Generally choose 6 or 8 strands crane wire rope structure, load or the rotation of the winding system may contribute to the difficulty in operation.
When the wire rope around the pulley or drum, it’s due to bending fatigue cause damage.Damage rate will be subject to the hoisting wire rope pulley number , the pulley diameter, weight and the impact of the frequency in the system.When selecting wire rope, if the bending fatigue is the main cause of damage of crane wire rope, the choice of crane wire rope structure of fine wire is very important
Abrasive wear occurs between wire rope and pulley or between wire rope and reel, but a greater cause of abrasive wear is the friction between wire rope on the drum, especially multilayer volume line.If abrasive was identified as the main factor of wire rope damage, we should choose the outer wire rope is relatively coarse against mechanical damage
When more than one layer of wire rope winding on the drum, it must be applied after a certain tension when loading line, we suggest installation tension minimum breaking force should be 2% ~ 10% of crane wire rope.Cable, metal wire rope than fiber rope core provides more compression resistance, twist wire rope with each other than concurrent twist wire rope to provide a better compression resistance.
If the crane wire rope used in corrosion environment, it is suggested that use galvanized wire rope which can choose smooth crane wire rope, if corrosion is limited when the moisture can penetrate into wire and cable, damage, plastic wire rope can be considered.All in the production and use of wire rope should be thorough and smooth, not just for corrosion protection, but also lubrication of wire rope in bending in order to reduce the wear and tear of the external and internal
Where the wire rope elongation are considered ,it is recommended to use high metal filling coefficient of steel wire rope, best filled plastic, this will prevent the wire rope diameter reduction in weight, prevent the wire rope is drawn.
1)high intensity, large load capacity, strong overload capacity ,good elasticity, impact resistance, small weight,
2) good flexible, smooth operation, low noise when high-speed movement
3) reliable work, not suddenly break
Whether crane wire rope scrap is mainly based on the degree of broken wire rope and other conditions:
1. The crane wire rope of hoisting machinery within a twist pitch broken wires up to 10% of the total number of wire rope such as wire rope 6 x 19= 114, when broken wire ropes up to 12 should be scrapped, 6 x = 222, 37 when broken wires up to 22 should be scrapped.For the thickness of wire rope, the calculation of broken wires is a root is a filament, a root of raw silk is 1.7.
2. The amount of steel wire radial wear or corrosion is more than 40% of the original diameter should be scrapped, when less than 40%, the broken wire scrap reduction in accordance with the provisions.
3. Lifting machinery hoisting hot metal or dangerous goods in the number of scrap wire rope, take general hoisting wire rope scrap standard a half
4. The structure of wire rope which is to meet ISO2408 (general use wire rope characteristic, stipulated in the standard of scrapped broken wires should be executed according to specified number GB5972-86.
5. The whole strand rupture should be scrapped.
6. When the wire rope diameter relative to the nominal diameter decreased 7% or more, even if not found broken wire, the wire rope should be scrapped.
7. Hemp core the leakage should be scrapped.
8. Wire rope has obvious corrosion should be scrapped.
9. The local outer wire elongation in cage state should be scrapped
10. To compare GB5972-86 possible typical example, crane wire rope damage is common with the figure should be scrapped.
