单机牵引60 kg/m钢轨9号道岔转辙器转换特性

Switching Characteristics of No.9 Turnout Switch of 60 kg/m Rail Using Single Machine Traction

以单机牵引60 kg/m钢轨9号道岔转辙器为研究对象,建立考虑尖轨初始内力的有限元模型,通过仿真计算分析滑床台摩阻力、牵引动程、尖轨固定端扣件数量对转辙器转换能力的影响。结果表明:当滑床台摩擦因数增大时,不足位移和转换力显著增加,最小轮缘槽宽度减小,滑床台的摩擦因数是影响道岔转辙器转换能力的关键因素,摩擦因数由0.25增加到0.40时,曲、直尖轨不足位移分别增加了39%和37%,转换力增加了36.2%;牵引动程增大时,最小轮缘槽宽度增加,不足位移和转换力受影响较小,在结构设计阶段可适当增加牵引点动程;尖轨固定端扣件组数增加时,不足位移显著降低,最小轮缘槽宽度减小,转换力变化不大,适当增加扣件组数有利于降低尖轨不足位移,但需考虑对最小轮缘槽宽度的影响。

A finite element model considering the initial internal force of the switch rail was established based on the study of a single machine traction 60 kg/m rail No.9 turnout switch.The effects of sliding bed friction,traction range,and the number of fixed end fasteners for switch rails on the switch capacity were analyzed through simulation calculations.The results show that as the friction coefficient of the sliding bed increases,the insufficient displacement and switching force significantly increase,and the minimum flange-way width decreases.The friction coefficient of the sliding bed is a key factor affecting the switching capacity of the turnout switch.When the friction coefficient increases from 0.25 to 0.40,the insufficient displacement of the curved and straight switch rails increases by 39%and 37%,respectively,and the switching force increases by 36.2%.When the traction range increases,the minimum flange-way width increases,and the insufficient displacement and switching force are less affected.In the structural design stage,the traction point range can be appropriately increased.When the number of fastener groups at the fixed end of the switch rail increases,the insufficient displacement significantly decreases,the minimum flange groove width decreases,and the change in switching force is not significant.Increasing the number of fastener groups appropriately is beneficial for reducing the insufficient displacement of the switch rail,but the impact on the minimum flange groove width needs to be considered.