Multiple methods can be used to identify and evaluate the external and internal wear and corrosion of electric hoist wire ropes. The following is a detailed breakdown and summary of these methods:

Identification methods for external wear and tear

Appearance inspection method:

Direct observation: By directly observing the surface of the steel wire rope with the naked eye, check for obvious deformation, cracks, wear marks or damage.

Hand feel inspection:

Hand touch method: Use your hand to touch the surface of the steel wire rope to check for obvious dents or protrusions, which are usually signs of wear.

Hand pulling method: Pull one end of the steel wire rope by hand to check for any broken roots, rust, etc., which may also be signs of excessive wear.

Hand pinching method: Use your fingers to pinch the outer skin of the steel wire rope and rotate it vigorously. If you feel obvious gaps, it may indicate that the steel wire rope has started to break and be damaged.

Measurement method:

Measure the diameter of the steel wire rope using tools such as calipers. If a significant decrease in diameter is found, it may indicate that the steel wire rope has worn out during use.

Listening method:

If an abnormal sound is heard while pulling the wire rope, it may indicate that the wire rope is worn or damaged internally.

Identification methods for internal wear and corrosion

Instrument detection method:

By using modern instruments such as ultrasonic detectors and utilizing the principles of ultrasonic propagation and reflection, the interior and surface of steel wire ropes can be inspected to identify potential wear and corrosion issues.

Electrochemical methods:

Although this method is mainly used for wire corrosion detection, in some cases, it can also be used for internal corrosion detection of steel wire ropes. By introducing current into the steel wire rope and measuring the electrode potential difference, it is determined whether the steel wire rope is corroded.

Evaluation and standards for wear and corrosion

Cable wear standard:

Cable wear is usually divided into three levels, including first level wear (surface wear depth is less than 5% of the conductor diameter), second level wear (surface wear depth is less than 15% of the conductor diameter and the cable sheath is not damaged), and third level wear (surface wear depth is greater than 15% of the conductor diameter, or cable sheath is damaged).

Evaluation method:

In addition to the appearance inspection and measurement mentioned above, electrical characteristic inspection can also be used to evaluate the electrical characteristics of steel wire ropes in worn or corroded areas, in order to determine whether it affects normal use.

Maintenance and preventive measures

Regular inspection: Conduct regular visual inspection, measurement, and necessary instrument testing on the steel wire rope to promptly identify and address potential wear and corrosion issues.

Avoid overload and overuse: Operate according to the rated load and working conditions of the electric hoist to avoid accelerated wear and corrosion of the steel wire rope caused by overload and overuse.

Storage and maintenance: During storage, avoid exposing the steel wire rope to damp and corrosive environments, and regularly clean and maintain it to extend its service life.

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