The length of the free section of the small-size turnout is short,and the number of traction points is small,so its pulling force is relatively large.In order to study the influence of switch rail stroke on the switching force of small-size turnouts and solve the problem of excessive switching force of small-size turnout,this paper established a solid model and finite element model of a curved switch rail of one small-size single-opened turnout.Based on the actual conversion process of the switch rail,its constraints and simulation conditions were set,and the equivalent stress and switching force during the switch rail conversion process were calculated.The rationality of the finite element model was verified through field experiments.The results show that the greater the stroke of the switch rail,the greater its equivalent force and maximum pulling force will be,and the maximum pulling force is linearly related to the stroke of the switch rail.The magnitude of the stroke directly affects the overall force state and pulling force of the switch rail,and reducing the stroke appropriately within a reasonable range can improve the usage state of the switch rail.The switch rail conversion model established in this article is close to the on-site measurement results,which is reasonable and reliable,and can be used to guide the design work of turnout related structures.
small-size turnoutstrokefinite element analysisswitch railswitching force
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