基于弧面法的摩擦式提升机衬垫摩擦性能测定

摘要

The friction between liner and wire rope is the key to the security and safety work of friction hoist.This paper proposed a new measurement about how to study the frictional properties based on the arc method.Friction tests were conducted on a self-made platform to study on the micro-sliding properties between liner and wire rope.By measuring the friction and the relative displacement,the stick-slip laws were determined and the variation laws of friction coefficient were studied based on the testing curves.The results show that the friction coefficient of K25 liner under dry friction increases with the decrease of specific pressure,but increases first and then decreases with the rising sliding speed (reaches maximum when sliding speed is 2 mm/s).When there is Koepe oil between liner and wire rope,the friction coefficient decreases with the increase of the specific pressure and the sliding speed.The inverse linear relationship between liner's friction coefficient and the specific pressure illustrates the friction between two interfaces is mainly adhesive friction.Compared with the plane method,the friction coefficient measured by the arc method is much smaller.%摩擦衬垫与钢丝绳之间的摩擦力是摩擦式提升机工作可靠和安全与否的关键因素.提出了一种基于弧面法研究摩擦衬垫与钢丝绳摩擦学特性的测量方法,在自研制的摩擦衬垫与钢丝绳动态微滑移摩擦实验平台上开展摩擦实验,通过测量摩擦衬垫与钢丝绳之间的摩擦力与相对滑移,判定衬垫与钢丝绳之间的黏滑规律,并基于测试曲线研究了衬垫与钢丝绳之间摩擦因数的变化规律.结果表明,干摩擦时K25衬垫摩擦因数随着比压的增大而减小,随滑速的增大先增大,后不断减小,滑速2 mm/s时达到最大值,涂增摩脂时摩擦因数随比压、滑速的增大而减小.衬垫的摩擦因数与比压成反比线性关系,说明摩擦衬垫与钢丝绳之间的摩擦以黏着摩擦为主.对比平面法测量摩擦衬垫的结果发现平面法测量的摩擦因数偏大.