滑床板摩擦力对尖轨不足位移的影响

为解决道岔尖轨不足位移问题,根据尖轨的特殊结构外形、受力特性和扳动机理,建立尖轨不足位移计算仿真模型,分析不同滑床板表面摩擦系数取值下尖轨不足位移的变化。结果表明:摩擦力是导致尖轨产生不足位移的主要原因;尖轨不足位移随滑床板摩擦系数的增加而增大,基本成线性递增关系;最后牵引点距尖轨跟端间间距越大,摩擦系数对不足位移的影响也越大。减小摩擦力和优化牵引点间距能够较好地控制尖轨不足位移。提出设置滚轮式滑床板方案,将轨底与滑床板间的滑动摩擦转化为滚动摩擦,并优化滚轮式滑床板布置方式,进一步减小了尖轨不足位移。

Effect on the Scant Displacement of Switch Rail Induced by Friction of Slide Baseplate

In order to solve the problem of the scant displacement of switch rail,a simulation model of switch rail for calculating scant displacement is set up according to special structure,mechanical behaviors and traction principle of switch rail.The variations of scant displacement induced by different surface friction modulus of slide baseplate are analyzed.The results show that friction is the main reason for scant displacement.On the whole,it grows with the increase of friction modulus linearly.The larger the distance between the last traction point and the heel of switch rail is,the more effect it has on the scant displacement induced by the friction modulus.Minishing friction and optimizing traction points space is a good way to better control the scant displacement.A project of setting wheel baseplate is brought forward,which can change slipping friction into rolling friction.Optimizing the layouts of wheel baseplate can further decrease scant displacement.