Causes of wire rope diameter change

Release time:

2021-06-01

The change of wire rope diameter is an important index for us to evaluate the use of wire rope. The change of wire rope diameter has the diameter increase and decrease, so what is the reason? The following Luoyang Baikte Technology Development Co., Ltd. will introduce the reasons for the change of wire rope diameter.

1. Decrease of wire rope diameter

For the problem of wire rope diameter reduction, we often see, mainly caused by the following factors single action or cross action:

① Diameter reduction due to natural elongation of the wire rope. The natural elongation of the wire rope is unavoidable. Generally, when the lifting wire rope is selected, the wire rope with a slightly larger diameter will be selected under the requirement of meeting the smaller breaking force of the wire rope. Foreign wire ropes are generally slightly larger than the diameter of the contract wire rope when delivered. Domestic wire ropes are generally not, but they are all within a controllable range.

② Diameter reduction due to wear. There are two kinds of wear here: one is external wear. The wear of the steel wire surface of the outer strand of the steel wire rope is caused by its contact and friction with the rope groove of the pulley and the drum under pressure. This phenomenon in the loading acceleration and deceleration movement, the wire rope and pulley contact parts are particularly obvious, and the performance of the external steel wire grinding into a plane. The other is internal wear, which is caused by the friction between each strand and the steel wire in the rope. During the use of the steel wire rope, it will be elongated and deformed by alternating stress. When the two steel wires in contact with each other deform out of step, fretting wear will occur between them. Fretting wear will cause wear debris, the diameter of the steel wire will decrease, and the diameter of the steel wire rope will decrease accordingly, especially when the steel wire rope is subjected to bending.

③ The rope diameter is reduced due to the damage or fracture of the rope core. When the fiber core of the steel wire rope is damaged or the steel core (or the inner strands in the multi-layer structure) is broken, it will cause the rope diameter to be significantly reduced.

2. Increase of wire rope diameter

In the process of using the wire rope, the diameter will generally decrease gradually. The so-called diameter increase means that the diameter of the wire rope increases after a period of time than when it has just been used. This situation is relatively rare and is mainly caused by the following reasons:

① The increase of rope diameter is usually related to the distortion of the rope core (such as in special environment, the fiber core expands due to moisture). The hemp core wire rope expands after absorbing water, and the diameter of the wire rope increases to a certain extent.

When the wire rope is unloaded, the unloading speed is too fast, causing the wire rope to deform or lantern-like, which leads to a local increase in the diameter of the wire rope and can spread to a long section of wire rope.

③ wire rope corrosion, steel wire chemical oxidation reaction, the production of ferric oxide, the oxide is loose and porous, so that the wire rope diameter increases. Usually, internal corrosion is not easy to detect, but the diameter of the wire rope is usually smaller at the bending part around the pulley. For the static section of the wire rope, the diameter of the wire rope is often increased due to the rust accumulation of the outer strands.

The above is the relevant content of the causes of wire rope diameter changes introduced by Baikte. Luoyang Baikte Science and Technology Development Co., Ltd. is a high-tech industry group dedicated to providing comprehensive solutions for safe operation of equipment. Its business involves the research and development, production, sales and service of high-performance friction pads, wire ropes, rope grease, numerical control rope groove maintenance equipment, wire rope nondestructive testing equipment and other products. Market services cover mines, ports, offshore equipment, oil exploration, bridges and cables, water conservancy and hydropower, special testing, astronomy, military research and other fields. Welcome new and old customers to visit the company to guide cooperation, business negotiations!