大型多支承回转窑支承结构的接触有限元分析

回转窑是冶金、水泥、耐火材料生产中的关键设备,它是一种重载、大扭矩、多支点、静不定运行系统。回转窑运行中由于轴线偏差,支承载荷分配严重不均,导致支承部件因接触应力过大而产生压溃、剥落和点蚀等现象。从支承载荷分配与轴线偏差的线性关系出发,根据赫兹接触理论,得出了支承结构接触力与轴线偏差的关系式;采用有限元方法对某档支承结构的接触问题进行分析,得到了接触区域情况及各部件的变形应力规律。分析结论与实际生产一致,为回转窑最佳运行状态的调整提供有效的理论依据。

THE CONTACT FINITE ELEMENT ANALYSIS OF SUPPORT STRUCTURE OF LARGE-SCALE ROTARY KILN WITH MULTI-SUPPORTING

Rotary kiln is a key equipment in the production of metallurgy, cement and refractory material. It is a statically indeterminate system with overload, large torque and multi-supporting. Because of axis line deflection and asymmetric load distribution of rotary kiln, the support parts may break, spall, or erode due to the induced overlarge contact stresses. Based on Hertz contact theory and the linear relation between load distribution and axis line deflection, the relational expression between contact stresses of supporting system and axis line deflection is derived. The contact problem of some support structure is solved with the finite element method, and contact areas and contact distortion/stress are obtained. The analysis results are consistent with practical production, which can provide effective theoretical guidance for adjusting rotary kiln into best operation state.