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以φ0.9m×2.5m试验颤振球磨机筒体为研究对象,分析其在复合颤振交变载荷作用下的疲劳情况。颤振球磨机筒体因在竖直方向的叠加振动,筒体内磨介的运动规律改变,使得磨介对筒体和端盖内壁的离散冲击载荷难以用传统公式推算。利用离散元和动力学分析软件仿真计算筒体的工作载荷谱,通过有限元分析筒体在此动态变载荷作用下的疲劳破坏情况。分析结果验证了颤振试验球磨机筒体的抗疲劳设计能力及其可靠性,得出筒体可能发生疲劳损伤最严重的部位,为磨机的正常检查、维修和进一步的优化设计改进提供参考。
Taking φ0.9m × 2.5m test flutter ball mill as the research object, the fatigue of the ball mill under the flutter alternating load was analyzed. Due to the superposition vibration in the vertical direction, the movement law of grinding medium in the cylinder body is changed by the vibration of the flutter ball mill cylinder, making it difficult to calculate the discrete impact load of the grinding medium on the cylinder body and the inner wall of the end cap by the traditional formula. Discrete element and dynamic analysis software were used to simulate the working load spectrum of the cylinder, and the fatigue failure of the cylinder under the dynamic load was analyzed by finite element method. The analysis results verify the anti-fatigue design capability and reliability of the cylinder of the flutter test. It is concluded that the most serious fatigue damage may occur to the cylinder, providing reference for the normal inspection and maintenance of the mill and further optimization and design improvement.