Crane wire rope inspection requirements and scrap standards

If you do not pay attention to the inspection and maintenance of the wire rope when using the crane in normal times, it is easy to cause the wire rope to break due to negligence and cause catastrophe. In daily use, attention should be paid to damages such as broken wires, abrasion, and deformation of the wire rope. Our editor will share with you the requirements and standards for wire rope inspections and the scrap standards for hoisting wire ropes.

1.  Broken wire: Broken wires are divided into inner broken wires and outer broken wires. The steel wire that admits that the cracks or scars have reached half the diameter of the steel wire shall be regarded as broken wires.
2.  Wear and damage: check whether the wear condition is concentric wear, but also partial pain, wear is simple wear and damage is plastic deformation caused by external pressure.
3.  Corrosion: Check the degree of rust, pitting, and curium corrosion. It is difficult to check the appearance of internal corrosion. When the steel wire is severely slack, it should be regarded as internal corrosion.
4.  Deformation: Check the kinks, turbulence, and flatness to recognize the degree of deformation.
5.  Electric arc and heat influence: If the steel wire with the phenomenon of tempering or burning is found to be broken.
6.  Oiling condition: Check whether the oiling condition of the wire rope is suitable.
7.  Rope end fastening parts: check the defects of the pressure block, cracks, and deformation of the rope end to see if some of the fixed rope ends are pulled out or slipped.
8.  Reel and pulley, check the wear condition of the bottom of the rope groove and the rolling condition of the pulley.

The crane wire rope presents one of the following conditions and should be discarded:

1.  The number of broken wires in a lay length (referring to the axial interval in which any wire rope strand is coiled for one week) of the twisted wire rope reaches 10% of the total wire number of the rope.
2.  For steel wire ropes for lifting hot metal or dangerous goods, the number of scrapped wires and broken wires is half of that of ordinary cranes. For example, the broken wires will occur in some places, or the broken wires will occur in one strand within six times the diameter of the wire rope. , Should be voided according to half of the rule in item 1.
3.  Corrosion or wear of steel wire on the outer surface of the wire rope reaches 40% of the diameter of the original wire on the outer surface.
4.  The steel wire rope has significant internal corrosion.
5.  The diameter of the wire rope has been reduced by 7%.
6.  There are cracks or slipping deformation at the joint between the steel wire rope and the aluminum alloy; the insertion part of the inserted braided steel wire rope has severe withdrawal; the casting wire rope anchorage and the connection part of the wire rope have displacement, causing the phenomenon of withdrawal.
7.  There is abrasion or corrosion on the surface of the wire rope, and there are a certain number of broken wires. The number of broken wires should be multiplied by the reduction factor in the rules of item 1 or 2 to determine: when the wear or corrosion rate is 10%, 15 %, 20%, 30%-40%, the reduction factor corresponds to 85%, 75%, 70%, 60%, 50%.
8.  The whole strand is cracked or burned out.
9.  Some outer steel wire ropes are elongated in a "cage" shape or the diameter of the steel wire rope fiber core increases more severely.
10.  Severe deformations such as kinks, dead ends, hard bends, plastic deformations, and hemp cores coming out of the wire rope.

The wire rope bumps, jumps out of the pulley, entangled messy, etc. will cause damage to the wire rope. Be sure to pay attention to inspection when using it.

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