Gantry crane rope wear

When the operation wire in contact with other objects and a relative movement friction. In the mechanical, physical and chemical action, the surface of the rope continue to wear.gantry crane Wear is the most common injury rope way, generally divided into external wear, deformation wear and internal wear three cases. Figure 1 shows the wear of several monofilament cross-sectional shape.

1.1 External Wear
In the course of wire rope and the pulley groove in its outer periphery, drum wall, a top hook surface wear caused by the contact part of the external wear. The external worn rope diameter becomes thinner, the outer peripheral surface is polished fine steel. Figure 2 is a rope wear surface of two types.

External wear of the rope to bear the load of the wire cross-sectional area decreases, the rope breaking load is reduced accordingly. Figure 3 is obtained through the test wire diameter reduction rate and the reduction rate of the breaking load of the curve. As can be seen from the curve, one week wear worn worse than the whole week, it should be possible to make a single week of the wire to wear uniform wear full week. Entire length of the wire should be as far as possible uniform wear. Such as eot crane  wire rope used for the first medium-term, generally extend rope life 30% to 40%.

1.2 Deformation Wear
Due to vibration, impact caused by collision damage rope surface, called deformation wear, which is a phenomenon of partial wear. If the surface of the wire rope drum impact by other objects, crane hoisting rope wrapped around each other to fight, or because the roll center deflection pulley and biting rope arising phenomenon will cause deformation rope wear. If the surface of the thin wire worn cut, deformation wear and abrasion of the difference between the external as shown in Figure 1. This deformation wear and deformation due to local press, the wire cross-section extending to the sides at the extrusion into a fin-shaped. From outward appearances, wire width expansion, although much reduced wire cross-sectional area, but the local press at the steel surface material hardened, easily broken wire.

1.3 internal wear
In the course of using gantry  jib crane  , wire rope through drum or pulley when the entire load of pressure to bear on one side of the rope, the radius of curvature of the root thin wire impossible identical. Also, because the rope bent, thin steel wire rope inside the root will generate force and produce another slip, then contact stress between stocks and shares increases, the share between adjacent wires produce local indentation furrow. When repeated cycles stretch bending, is generated in the deep recesses of stress concentration was broken, constitute internal wear. Usually thin wire rope surface pressure and the pressure proportional to the tension of the same case, since the pressure receiving area are different, the pressure per unit area is different. Under pressure from the surface wear of view, the use of line contact wire rope advantageous than using point contact, the use of surface contact wire rope line contact than using more favorable. In addition, the degree of bending wire rope, velocity, internal wear on the rope are affected. Obviously, the selection line contact or surface contact type of rope is an effective way to reduce internal wear.