Safety inspection of wire rope？

2023-04-12 22:12:13

The inspection of Steel Wire Ropes can be divided into daily inspection, regular inspection and special inspection. Daily inspection is self-inspection; regular inspection can determine whether to use monthly inspection or annual inspection according to the device form, usage rate, environment and the results of the previous inspection. The inspection contents and requirements of the wire rope are shown in the following table.

The specific inspection methods are as follows:
(1) The number of broken wires is counted in one pick distance, including the external and internal broken wires. Even if there are 2 broken wires on the same wire, the statistics should be counted according to the number of 2 broken wires. If the broken part of the wire exceeds its own radius, it should be treated as broken wire.
① During the inspection, attention should be paid to the position of the broken wire (such as how far from the end) and the concentration of the broken wire to determine the treatment method.
② Pay attention to the position and shape of the broken wire, that is, the broken wire occurs in the protruding part of the strand or the valley part. According to the shape of the broken wire, the cause of the broken wire can be judged.
(2) Wear and tear inspection is mainly the measurement of wear state and diameter. There are two states of wear: one is concentric wear and the other is eccentric wear. Eccentrically worn wire ropes mostly occur in occasions where the movement of the rope is not large, the spreader is heavy, and the tension changes greatly. For example, the hoisting ropes of electromagnetic chuck cranes are prone to such wear. Eccentric wear and concentric wear also reduce the strength of the wire rope.
(3) There are two types of corrosion corrosion: external corrosion and internal corrosion. Inspection of internal corrosion and external corrosion: visually inspect the wire rope for rust, pitting, and loose wire. Erosion is not easy to detect. Internal corrosion is not easy to detect. If it is a wire rope with a small diameter (20mm), you can bend the wire rope for inspection; if the diameter is large, you can use the wire rope to insert the fiber for internal inspection. And add lubricating grease.
(4) Deformation Visually inspect the knots, waves and heights of the wire rope. The wire rope should not be knotted, nor should there be large wave deformation.
(5) The influence of electric isolation and fire roasting Visual wire rope, there should be no tempering bag, nor should there be welding damage. Weld damage should be treated as broken wire.
(6) Lubrication inspection of wire rope The wire rope should be in a good lubricated state. According to the test, the well-lubricated wire rope breaks up to 10% of the total number of wires within a pick distance, and can reach 48,500 times by fatigue test and repeated bending, while the wire rope of the same specification without lubrication is only 22,500 times, which shows the importance of lubrication.