The structure and performance of elevator wire rope and
the performance requirements of scrap standard traction wire rope are to have high strength, good wear resistance and good flexibility: according to the toughness of the wire rope and the number of bending times, it can be divided into three grades .
The safety factor of the elevator wire rope refers to the ratio between the minimum breaking load (N) of a wire rope and the maximum force (N) of the wire rope when the car with the rated load stops at the lowest floor.
The strength of the traction rope is measured by the static load safety factor. my country stipulates that the static load safety factor of three or more traction-driven elevators is 12.
There should be at least two elevator suspension wire ropes, and each wire rope should be independent.
There is a rope core in the center of the rope strand of the elevator wire rope. The function of the rope core is to increase the winding and elasticity, facilitate lubrication and increase the strength. The steel wire rope core is made of sword cotton, cotton yarn, asbestos fiber and mild steel wire.
There are three types of double-wound ropes according to the twisting method: inter-wound rope, parallel-wound rope and mixed-twist wire
rope. The nominal diameter of the elevator wire rope should not be less than 8mm.
The diameter of the outer steel wire of the traction wire rope is generally not less than 0.6mm.
The product of the nominal cross-sectional area of the wire rope (mm2) and the nominal tensile strength of the wire rope (N/mm2) and the conversion factor of the minimum breaking load of the wire rope of a certain structure is called the minimum breaking load of the wire rope.
The tensile strength of elevator steel wire should be 1570MPa or 1770MPa for single-strength steel wire rope; the tensile strength of elevator steel wire should be 1570MPa and 1770MPa for double-strength steel wire rope.
Regardless of the number of strands of the wire rope, the ratio of the pitch diameter of the traction sheave, pulley or reel to the nominal diameter of the suspension rope should not be less than 40.
Lubricants for wire ropes should have anti-rust properties.
The device for adjusting the length of the wire rope or chain should not loosen by itself after adjustment.
The car and the counterweight (or counterweight) shall be suspended by steel wire ropes or parallel link steel chains or roller chains. The minimum distance between the car and its associated parts and the counterweight (or counterweight) and its associated parts should not be less than 50mm.
When the wear of the outer layer of the wire rope reaches 40% of its diameter, the wire rope should be scrapped, and the wire rope fiber core damaged or the steel core is broken and the rope diameter is significantly reduced. When the diameter of the wire rope is reduced by more than 7% relative to the nominal diameter, that is, no wire breakage occurs, and the wire rope should also be scrapped.
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