How to select the wire rope hoist:

卷扬机钢丝绳的种类，根据钢丝绳中钢丝与钢丝的接触状态不同又可分为：

Types of steel wire rope winch, according to the contact state of steel wire and wire of wire rope can be divided into different:

（1）点接触钢丝绳 点接触钢丝绳绳股中各层钢丝直径均相同，而内外各层钢丝的节距不同．因而相互交叉形成点接触。其特点是接触应力高．表面粗糙，钢丝易折断，使用寿命低。但制造工艺简单，价格便宜。在实际中常发现这种钢丝绳在受拉、尤其是受弯时由于钢丝间的点接触、造成应力集中而产生严重压痕，由此导致钢丝疲劳断裂而使钢丝绳过早报废。

(1) points of contact wire rope point of each layer of steel contact wire rope diameter are the same, and the layer of steel wire pitch. Thus cross each other to form point contact. Its characteristic is the contact stress is high. The surface is rough, steel wire is easy to break, low service life. But the manufacturing process is simple, cheap price. This kind of steel wire rope under tension, especially in bending the wire between the point contact, cause stress concentration and cause serious indentation often found in practice, resulting in the fatigue fracture of the wire rope is scrapped prematurely.

（2）线接触钢丝绳 线接触钢丝绳绳股由不同直径的钢丝统制而成，每一层钢丝的节距相等，由于外层钢丝位于内层钢丝之间的沟槽内，因此内外层钢丝间形成线接触。这种钢丝绳的内层钢丝虽承受比外层钢丝稍大的应力，但它避免了应力集中，消除了钢丝在接触处的二次弯曲现象，减少了钢丝间的摩擦阻力。使钢丝绳在弯曲上有较大的自由度，从而显著提高了抗疲劳强度，其寿命通常高于点接触钢丝绳。由于线接触钢丝绳比点接触钢丝绳的有效钢丝总面积大，因而承载能力高。如果在破断拉力相同的情况下选用线接触钢丝绳，可以采用较小的滑轮和卷筒直径，从而使整个机构的尺寸减小。应优先选用线接触钢丝绳。卷扬机厂，卷扬机，奉溪卷扬机

(2) the contact wire rope strand wire controlled by different diameter and into the line contact wire rope line, each layer of steel wire pitch is equal, the trench outer wire in the inner steel wire between the inner and outer layer steel wire, so the line contact is formed between. Inner steel wire of the steel wire rope is subjected to stress is slightly larger than the outer layer steel wire, but it avoids the stress concentration, the elimination of the wire in the two bending phenomenon at the point of contact, reducing friction resistance wire. The steel wire rope in bending a greater degree of freedom, which significantly improves the anti fatigue strength, its life is usually higher than the point contact wire rope. Because the line contact wire rope than point contact wire rope wire total effective area is large, so the high bearing capacity. If the choice of linear contact lay wire ropes in breaking force under the same conditions, the pulley and the drum diameter smaller, so that the whole body size. Priority should be given to the selection of linear contact lay wire rope.