Safety hidden danger of crane wire rope

In the actual operation process, the wire rope of the crane touches other objects and has a relative speed. Under the actual effects of mechanical equipment, physical chemistry and organic chemistry, the appearance of steel wire ropes has also been continuously damaged. The most common damage methods of steel wire ropes are generally divided into external damage, deformation damage and internal damage.

The crane should avoid walking under the effect of the load. If you need to walk a short distance, the load should not exceed 70% of the weight. Allow the workpiece to be no more than 50mm off the ground, and pull the part forward and onto the slip line to control the movement of each component.

External damage to the wire rope: during the entire use of the crane wire rope, the damage caused by touching the surface of the movable pulley wheel groove, the wall of the ring cylinder, and the hook seat of the crane wire rope is an external damage. After external damage, the diameter of the steel wire rope will become narrower, and the thin stainless steel wires on the peripheral surface will be worn away.

When transported, the strength of the precast concrete elements is less than 75% of the concrete plan. During the transportation process, the support position and method of the components should be based on the planning point of the crane, and should not cause stress and damage to the components. The transportation between folding parts must be separated by partitions or stows. The wood piled up and down should be kept in the same straight line, and the cushion should meet the planning requirements to avoid folding of the components. The road should conform to the width and turning radius.

Deformation and damage of the wire rope: The external damage of the crane wire rope due to vibration and collision is called deformation damage, which is part of the damage site. If the wire rope on the outside of the drum is hit by other objects, the lifting wire ropes of the lifting equipment are entangled with each other. The wire rope may be deformed and damaged due to the skew of the movable pulley and the skew of the industrial foundation of the reel.

The selection of key points should be in the same straight line with the center of gravity, and the lifting point should be above the center of gravity, so that the heavy objects can be lifted straight. The key to electric shock safety control: when the voltage does not exceed 36V, use hoisting operation lighting.

Internal damage of the wire rope: During the entire use process, when the crane wire rope passes through the drum or moving pulley, the required load is pressed on one side of the wire rope, and the radius of curvature of each thin stainless steel wire may not be exactly the same. To sum up, because the wire rope is rough, every thin stainless steel wire in the crane wire rope will have actual effect force and slip. At this time, the ground stress between the steel strands will expand, which will cause a part of the stainless steel wire between adjacent steel strands to have a part of deep indentation, which will expand the analysis of the reasons for the cracking of the bridge crane wire rope.

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