The strands of the steel wire rope can also be made into compact strands by post-treatment methods such as rolling or die extrusion. After treatment, the diameter of the strands will be reduced, and the surface finish will be high. Therefore, the densely stranded wire rope can use thicker steel wires. Under the same diameter, the densely stranded wire rope has a higher filling factor and greatly improves the breaking force. When multi-layer winding is performed on the reel, the outer strands of ordinary strands of steel wire ropes are squeezed more severely between layers, and the surface of the wire rope wears quickly.
The tightly stranded steel wire rope has higher abrasion resistance and anti-extrusion ability. Wire ropes are commonly used on construction cranes, and are generally made of many high-strength steel wires braided and wound. It first consists of single steel wires wound together to form strands, and then some of the strands are wound into a rope core, and then outer strands composed of other strands are wound around the rope core to form a steel wire rope. Some imported steel wire ropes also contain a plastic ferrule inside, usually in the form of a plastic coating, which is covered on the rope core through a special treatment. Important steel wire ropes are filled with appropriate lubricants to reduce friction. Domestic steel wire ropes are generally divided into organic matter (hemp core and cotton core), asbestos core or metal core according to the rope core material.
There is usually no filler or lubricant inside the rope. According to the mutual direction of the steel wire winding into strands and the strand winding into the rope, the wire rope can be divided into the winding rope and the cross winding rope, and according to the twist direction of the strand rope, it is divided into left and right twists in the same direction and left and right alternate twists; imported steel wire ropes Generally, the winding rope is used as the standard rope, and the direction of the wire rope is specified to be consistent with the direction of the outer strand helix relative to the longitudinal axis of the wire rope, which is divided into left-handed and right-handed.
Correspondingly, the direction of the strands is also specified, that is, the direction of the helix of the outer filaments constituting the strands is the direction of the strands based on the longitudinal axis of the strands. When the ordinary steel wire rope is used in a single rope, it rotates in the opposite direction of the wire rope. When used in a pulley block, the lifting wire rope twists due to the rotation of the wire rope, which is commonly known as twisting. Compared with ordinary steel wire ropes, non-rotating steel wire ropes have begun to be widely used. The so-called non-rotating steel wire rope is based on the principle that the torsional moment of the rope and the strands are opposite and equal in magnitude: the imported non-rotating steel wire rope is different.
The principle is to make the rotation direction of the rope core opposite to the rotation direction of the rope itself. When force is applied, the torque produced by the rope core is equal to the torque produced by the outer strands, and the direction is opposite. The strands of the steel wire rope can also be made into compact strands by post-treatment methods such as rolling or die extrusion. After treatment, the diameter of the strands will be reduced, and the surface finish will be high. Therefore, the densely stranded wire rope can use thicker steel wires. Under the same diameter, the densely stranded wire rope has a higher filling factor and greatly improves the breaking force. When multi-layer winding is performed on the reel, the outer strands of ordinary strands of steel wire ropes are squeezed more severely between layers, and the surface of the wire rope wears quickly. The tightly stranded steel wire rope has higher abrasion resistance and anti-extrusion ability.
