How to extend the service life of the wire rope
Cut the end and eliminate the wear point
If it is found that the wear is expanding in the local area, it is best to cut the wire rope for a short period of time. This may require the initial length of the wire rope to be greater than the usual length of use. If severe wear or a large number of fatigue break points occur near the tail end or in any concentrated area, such as the tow rope of the traction rope or the retractable rope of the grab bucket, cutting off these worn parts can extend the service life of the wire rope.
The steel wire at the end will be broken due to vibration fatigue, so the wire rope at this point is cut off for a short period of time, and the steel wire is re-inserted to help extend the service life of the wire rope.
At the balance guide wheel provided on most overhead cranes, the place where the rope meets the balance guide wheel is prone to fatigue. If the wire rope at one end of the reel is cut off for a short period so that the contact point between the rope and the guide wheel is displaced, the service life of the steel cord can be increased. Be sure to remove the dressing before the balance guide wheel is severe and must be removed from the same roll. (North American oil drilling wire ropes pass the “ton-mile” quantitative indicator and follow a planned cutting procedure that significantly extends the life of the drill wire rope.)
Severely worn areas are usually too far from the end or the worn parts are too long to be removed. In this case, the end of the steel cord can be inverted, and the less worn parts can be placed in areas prone to wear. This operation is beneficial for the tilting rope and the traction rope. The tail end must be inverted before the wear and tear meets the replacement criteria. When the tail end is inverted, kinks should be avoided to reduce the damage of the steel rope.
Regular cleaning and lubrication to reduce wear
Lubrication during production is not guaranteed to adequately lubricate the wire rope throughout its life cycle. Therefore, it is important to lubricate the wire rope regularly over its service life.
During use, the surface of the wire rope will cover dirt, stone chips or other materials. This will prevent the oil applied on site from penetrating into the wire rope. Therefore, it is necessary to clean the wire rope before lubrication.
There are three ways to lubricate: drop-in; spray and hand brush.
Regardless of the type of lubrication, it should be lubricated at the bend of the wire rope, such as the wheel groove. Because the strands in this position are stretched due to bending and are more permeable. Wire rope life is closely related to the lubrication method and the effectiveness of the lubrication.
Proper lubrication reduces friction and prevents corrosion. Do not use grease or machine oil for lubricating oil. The permeability of the grease is not good, and the wire rope is too hard (the high-end rope grease is mostly derived from the asphalt-based oil) to damage the wire rope. The used machine oil contains substances that damage the wire rope.