Steel ropes - general definition and basic parameters

The steel zinced rope is twisted fromsteel wire product. At its manufacturing thin rods (threads) of various thickness and quality are used. All of them are spirally wound in one strand. Any rope consists of several twisted strands of the same type and a metal or organic core. The core is located in the center of the cable, fills its emptiness and prevents the neighboring wire rolls from falling through. Impregnated with an anti-corrosion grease, it protects the inner layer from corrosion when bending the cable. The wire used can be galvanized or uncoated, have a circular or shaped cross-section. Its ultimate tensile strength is in the range of 900 to 3500 N / mm2. The number of strands in the rope, which are located around the core, determine its structure.

Steel ropes differ from each other in shapecross section, physical and mechanical characteristics of wires and have a large number of structures. The flexibility and rigidity of the rope depend on the grade of material, the type of core, the direction of the twist, the number of wires in the strand. The more wires used, the more flexible the rope.

Depending on the operating conditions, steelropes are divided into traction, reinforcing, lifting, cargo, towing, shaft, bearing, etc. Widely used these products have received in many industries and municipal services. Steel ropes are a load-bearing element of transport, road-building, load-lifting structures and machines. The quality of these devices ensures the safety of the use of all lifting mechanisms.

According to the structural feature, the steel rope (GOST 3241-80 or DIN 3051) distinguishes the following types:

1. Single strand. Such a cable consists of one strand. He has wires of one diameter of the suite in one layer (or several interlayers) around one wire.
2. A double whiff. This rope consists of several strands that make up one or two layers, and are arranged around the core.
3. The Triple Whistle. It consists of three strands, which are formations among themselves and do not have a core.

Strand casting can be cross, one-sidedor combined, left or right direction, untwisted or non-twisting torsion method. Inside, the strands of wire have a point, linear or point-linear touch.

Steel ropes are characterized by the followingby the formula: N * M + L, where N is the number of strands, M is the number of wires in one strand, L is the number of cores in the rope. For example, writing 6 * 36 + 1 means that the rope consists of six strands, each containing 36 wires, and one core.

Steel cables must be stored wounddense rows on reels (reels) or folded into small bays. From the impact of the aggressive environment, the bay with the cable must be protected by a canvas bag, located on a wooden pallet (in sunny weather, the cover is removed). Excessive bends are harmful to the cable. Therefore, the packaging for him is selected carefully. If the rope is properly stored, the life of the product is not limited.