How to select the steel wire rope of hydraulic winch

How to select the wire rope of the hydraulic winch:

According to the different contact state of steel wire and steel wire in the wire rope, the types of hoist wire rope can be divided into:

(1) The diameter of each layer of wire in the strand of a point contact wire rope is the same, but the pitch of the inner and outer layers of steel wire is different. It is characterized by high contact stress, rough surface, easy fracture of steel wire and low service life. But the manufacturing process is simple and the price is cheap. In practice, it is often found that this kind of steel wire rope produces serious indentation due to the point contact between the steel wires during tension, especially in bending, which leads to the fatigue fracture of the steel wire and causes the wire rope to be scrapped prematurely.

(2) Wire contact wire rope the strand of wire contact wire rope is controlled by steel wires of different diameters, and the pitch of each layer of steel wire is equal. Since the outer steel wire is located in the groove between the inner steel wire, line contact is formed between the inner and outer steel wires. Although the inner steel wire of this kind of wire rope bears a little more stress than the outer steel wire, it avoids the stress concentration, eliminates the secondary bending phenomenon of the steel wire at the contact, and reduces the friction resistance between the steel wires. As a result, the fatigue strength of the wire rope is significantly improved, and its service life is usually higher than that of the point contact wire rope. Because the total effective wire area of wire rope is larger than that of point contact wire rope, the bearing capacity is high. If line contact wire rope is selected under the same breaking force, smaller pulley and drum diameter can be used to reduce the size of the whole mechanism. Wire contact wire rope should be preferred.