The steel wire rope casting manufacturer stated that the steel wire rope is composed of rope strands, steel wires and cores. Elevator wire rope is made of single strands spirally wound around a rope core. Usually 50~65 high quality carbon steel or 60Si2Mn steel wire is used. For safety reasons, the elevator wire rope uses special or No. 1 steel wire, and its wire diameter is limited to 0.3 ~ 1.3 mm.
Wire rope casting manufacturers believe that elevator wire ropes rarely break suddenly under normal working conditions. The damage is generally caused by wear, bending fatigue, corrosion or trauma during long-term operation. Pay special attention to inspections for wear and corrosion. This includes wear on the surface of the rope, between strands and between wires. Mechanical wear mainly includes external uniform wear, deformation wear and internal wear.
Generally speaking, wire rope casting manufacturers believe that the elevator wire rope wears slowly because its hardness is higher than the rope groove. However, due to the tension, groove shape, slippage, eccentric wear and rolling of the wire rope in the groove, it wears together with the rope groove and is uniform under normal circumstances. Wear refers to the local wear and tear of the elevator wire rope in a certain section. It is caused by the frequent and chronic displacement of the elevator wire rope and the sheave or the severe vibration and impact of the elevator wire rope on the sheave, which causes the elevator wire rope to be partially squeezed and deformed; although the section of the elevator wire is The area has not been reduced, but the steel wire material at the local extrusion has been damaged and the wire is easily broken. Internal wear is due to frequent bending of the elevator wire rope, relative displacement between wire strands, increased contact pressure between strands, and local indentations of the steel wires between adjacent strands, which may cause fracture due to stress concentration over time.
Wire rope casting manufacturers believe that during use, elevator wire ropes will corrode, their mechanical properties will decrease, the wire diameter will become thinner, and the rope strands will become loose, leading to brittle fracture. This type of break is an "avalanche" break, which is more dangerous than ordinary broken wires or fraying. During maintenance, special attention should be paid to the rust of the wire rope and observed carefully. If it is found that the corrosion is severe and pits have formed or the outer wire of the rope strand is loose, it should be replaced without judging how much the wire or rope diameter has become thinner. If "red oil" is found in the wire rope, it means there is no oil in the rope core and there is rust inside, so you should pay attention. If necessary, the rope ends can be chopped to inspect the internal corrosion of the wire rope. The way to prevent wire ropes from rusting is to oil the wire ropes for protection.
Analysis of wire rope breakage:
(1) Broken wire due to overload. Wire rope casting manufacturers believe that elevator wire rope breakage is caused by cup-shaped plastic shrinkage caused by overload or impact load. Due to the high safety factor of elevator wire ropes, this situation is rare.
(2) Fatigue fracture. Wire rope casting manufacturers believe that the outer steel wire that generally occurs on the larger side of the steel strand bending process is broken due to metal fatigue and has a uniform fracture shape.
(3) Wear and broken wire. Wire rope casting manufacturers believe that it is caused by friction and sliding between the wire rope and the traction sheave. This kind of broken wire is caused by extremely serious wear of the steel wire. It occurs on the outer steel wire. There are diagonal stubble breaks on both sides, and it breaks in a flat shape.
(4) Rusty and broken wires. Caused by severe corrosion. The fracture is irregular and has the shape of a brazing tip;
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