关键词: 专用机械工程, 球磨机, 数值模拟, 接触非线性, 应力分析, 有限元分析, 回转体

Abstract: A whole finite element analysis model was built to analyze the stress in a large ball mill, including its major components such as the main bearing and the rotary body. The contact pair elements between the saddle pedestal and the bearing bushing, as well as between the bearing lining and the trunnion were taken as the boundary conditions in the numerical simulation. A static full load condition, a full load startup condition and the normal working condition were computed and the stress amplitudes and their change patterns in the saddle pedestal, bearing bushing, bearing lining, trunnion, end covers and middle cylinder body were obtained. The results show that the maximal stress appears in the fillet which connects the feeding cover and the trunnion, and the minimal stress appears in the middle of the cylinder body. A field test on the stress in the cylinder body of the ball mill was performed and the axial and circumferential stresses in the typical sections were recorded when the ball mill turns a whole revolution at static full load condition. The tested stresses were in good agreement with the corresponding simulated results, showing the correctness of the numerically simulated results.

Key words: specialuse machinery engineering, ball mill, numerical simulation, contact nonlinearity, stress analysis, finite element analysis, rotary body