便携式绳轨提升装置的轮盘-绳索摩擦提升力模型

Lifting capacity model based on wheel-rope friction for portable rope-track hoist

为提高便携式绳轨提升装置的实用性,对基于摩擦的该类装置的提升能力展开研究。利用控制变量法分别研究末端拉力、包角与轮盘-绳索相对尺寸对两者之间摩擦提升力的影响,结果表明该提升力均随三种因素的增加而增加但趋势变缓;轮盘-绳索之间的静摩擦系数随绳索末端拉力与包角的增加而减小并趋于稳定,随轮盘-绳索相对尺寸的增加而增加并收敛。论证了包角与末端拉力对摩擦提升力的影响相互等效,发现了轮盘-绳索摩擦的尺寸效应,构建了以上因素共同作用下的轮盘-绳索摩擦提升力模型。该模型是对欧拉公式的扬弃,深化了对轮盘-绳索摩擦规律的认识,对便携式绳轨提升装置的小型化、轻量化设计具有重要意义。

In order to improve the usability of PRTH（ portable rope-track hoist）,the friction-based PRTH lifting capacity was studied. The influence of tension at the end of the rope,wrap angle and relative size on the friction between the wheel and the rope was experimentally studied by using the control variant method. The results show that： the friction increases with the increase of the three factors,but the trend is slowed down; the coefficient of static friction decreases with the increase of the end tension and the wrap angle and tends to be stable,and it increases with the relative size of the wheel to the rope and converges to a constant. The effects of wrap angle and end tension on the friction were demonstrated to be identical to each other,the size effect of wheel-rope friction was found,and a new lifting capacity model on wheel-rope friction was established with the three factors. The model is the sublation of Euler formula,deepens the understanding of the friction law between the wheel and the rope,and is of great significance to the miniaturization and lightweight design of PRTH.