大型回转窑支承滚圈的有限元动力特性分析

滚圈是回转窑最重要的支承部件,运转中弯曲应力造成的疲劳开裂是其主要失效形式。回转窑运行中由于自身因素及外界的冲击突变载荷导致运行轴线动态变化而给滚圈带来动应力,从而加速其疲劳破坏。文章分析了滚圈动载荷分布情况,采用有限元法对支承滚圈进行模态分析,得到支承滚圈的模态特性及其动态危险部位;进行突变阶跃载荷下的瞬态动力响应分析,得到位移应力响应规律,并分析动应力对部件疲劳强度的影响。所做结论是回转窑结构静力分析的补充和发展,为设备的动态健康维护和结构强度分析奠定了基础。

Analysis of the Dynamic Characteristic of the Supporting Roller of a Large-scale Rotary Kiln with Finite Element Method

Rollers are the most important supporting part of a rotary kiln.Fatigue cracking of a roller is the main failure form due to the alternate bending stress in operation.Change of dynamical axis caused by factors of itself or outside impact abrupt load will bring dynamical load to the roller,which will accelerate fatigue wreck.The dynamical load distribution of a roller is analyzed.With finite element method,the modal analysis of a roller is performed to determine the roller modal character and the dynamical dangerous positions.Under the abrupt step load of a roller,transient dynamical response analysis is completed to study its displacement and stress response and how dynamic stress influences the fatigue failure of a rotary kiln.The conclusions supplement and develop the structural static analysis,and can be used in dynamic health maintenance and structural strength analysis.