大型格子式球磨机物料动力学分析

Analysis of the material dynamics of a large lattice ball mill

由于进口大型球磨机资料的缺失,工程上对该型号球磨机的最佳填充率和最佳球磨转速缺乏足够的认识,以至于球磨机故障频发。为了研究球磨机转速与填充率对滚筒作用力的变化规律,并延长球磨机寿命和提高球磨效率,以球磨机滚筒内物料的运动为基础对球磨机受物料作用力进行分析,通过分析不同的填充率、不同的转速下物料对滚筒的作用载荷和分布,推导出脱离角和下落角的关系及其与滚筒受力面积的关系,并计算了不同转速、不同填充率下物料对滚筒内壁的摩擦力的分布情况。分别建立了不同转速下的下落角和脱离角模型、受载荷面积模型和滚筒受摩擦力模型。最后针对选矿厂大型格子式球磨机进行分析,并结合实际工况对各模型进行仿真分析。

Due to the lack of data for an imported large ball mill with grinding balls in a cylinder,there is insufficient reference material to allow the speed and filling rate of this type of ball mill to be optimized. This results in frequent failure of the ball mill. Therefore,it is necessary to study the influence of different filling rates and different speeds on the mechanical properties of the ball mill in order to obtain the relationship between the rotation speed and the filling rate,and extend the service life of the ball mill and improve its efficiency. In this paper,based on the movement inside the ball mill,the interactions between the steel balls in the ball mill are analyzed. By considering different speeds and different fill rates,the load conditions of the drum of the ball mill are analyzed,and the relationship between the separation angle and the falling angle are analyzed. By means of the above analysis,a falling angle and separation angle model,a load area model and a roller friction model were established. A simulation analysis of each model was carried out under the actual working conditions.