基于离散元法的立式搅拌球磨机建模仿真研究
发布时间：2018-11-03 20:16
【摘要】：立式搅拌球磨机是一种重要的超细粉磨设备,广泛的应用于各个领域。本文论述了立式搅拌球磨机的历史及国内外的发展现状、目前的理论研究以及工作原理和研究方向,详细介绍了离散元法的基础理论和离散元法在球磨机上的应用,对颗粒离散元软件EDEM进行了简单的介绍。对立式搅拌机球磨机内的矿料运动情况进行了分析计算,并且分析了矿料的粉碎机理及粉碎过程中应力应变的关系和能耗规律。而且还对立式搅拌球磨机的筒体大小、螺旋升角、搅拌器的转速、介质球的尺寸、介质球的配比进行了分析计算,为后面的仿真和实验做好理论基础。本文以立式搅拌球磨机为研究对象,建立简易的三维模型,使用颗粒离散元软件EDEM对立式搅拌球磨机的搅拌器转速、介质球配比、螺旋搅拌器的螺旋角进行仿真,得出运动过程中介质球和矿料的平均法向力、平均切向力、平均动能以及搅拌器的转矩,并结合岩石的破碎理论,计算出矿料所需要的极限抗压力和极限抗剪力,以及计算出搅拌器与介质球和物料的能量转换率进行分析对比,得出最佳的转速、介质球配比以及螺旋角。并且得到介质球和物料在运转过程的运动状态。通过对铂钯矿的分组实验得到-200目的矿粒产量,与EDEM软件仿真的结果进行对比得出,实验结果与实际结果基本保持一致,从而为立式搅拌球磨机的结构参数优化和工作参数优化提供参考依据。
[Abstract]:Vertical mixing ball mill is an important ultrafine grinding equipment, widely used in various fields. In this paper, the history of vertical mixing ball mill and its development at home and abroad are discussed. The current theoretical research, working principle and research direction are discussed. The basic theory of discrete element method and the application of discrete element method in ball mill are introduced in detail. The particle discrete element software EDEM is briefly introduced. The movement of ore in the ball mill of opposite mixer is analyzed and calculated, and the mechanism of crushing, the relationship between stress and strain and the law of energy consumption during crushing are analyzed. In addition, the size of cylinder, spiral angle, rotating speed of agitator, the size of medium ball and the proportion of medium ball are analyzed and calculated, which provides a theoretical basis for the simulation and experiment. In this paper, a simple 3D model of vertical agitating ball mill is established, and the agitator speed, medium ball ratio and spiral angle of spiral agitator are simulated by using the discrete element software EDEM, which is used to simulate the rotating speed of agitator, the proportion of medium ball, and the helical angle of spiral agitator. The average normal force, the average tangential force, the average kinetic energy and the torque of the agitator during the moving process of the medium ball and the mineral mass are obtained. Combined with the rock breaking theory, the limit pressure resistance and the ultimate shear resistance of the mineral material are calculated. The energy conversion rate of the agitator is calculated and compared with that of the dielectric sphere and material, and the optimum rotational speed, the ratio of the medium ball and the spiral angle are obtained. And the movement state of the medium ball and material in the running process is obtained. Through the grouping experiment of platinum-palladium ore, the output of -200 target ore is obtained, and compared with the simulation results of EDEM software, the experimental results are basically consistent with the actual results. Thus, it provides a reference for the optimization of structural parameters and working parameters of the vertical mixing ball mill.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.9
本文编号：2308906
[Abstract]:Vertical mixing ball mill is an important ultrafine grinding equipment, widely used in various fields. In this paper, the history of vertical mixing ball mill and its development at home and abroad are discussed. The current theoretical research, working principle and research direction are discussed. The basic theory of discrete element method and the application of discrete element method in ball mill are introduced in detail. The particle discrete element software EDEM is briefly introduced. The movement of ore in the ball mill of opposite mixer is analyzed and calculated, and the mechanism of crushing, the relationship between stress and strain and the law of energy consumption during crushing are analyzed. In addition, the size of cylinder, spiral angle, rotating speed of agitator, the size of medium ball and the proportion of medium ball are analyzed and calculated, which provides a theoretical basis for the simulation and experiment. In this paper, a simple 3D model of vertical agitating ball mill is established, and the agitator speed, medium ball ratio and spiral angle of spiral agitator are simulated by using the discrete element software EDEM, which is used to simulate the rotating speed of agitator, the proportion of medium ball, and the helical angle of spiral agitator. The average normal force, the average tangential force, the average kinetic energy and the torque of the agitator during the moving process of the medium ball and the mineral mass are obtained. Combined with the rock breaking theory, the limit pressure resistance and the ultimate shear resistance of the mineral material are calculated. The energy conversion rate of the agitator is calculated and compared with that of the dielectric sphere and material, and the optimum rotational speed, the ratio of the medium ball and the spiral angle are obtained. And the movement state of the medium ball and material in the running process is obtained. Through the grouping experiment of platinum-palladium ore, the output of -200 target ore is obtained, and compared with the simulation results of EDEM software, the experimental results are basically consistent with the actual results. Thus, it provides a reference for the optimization of structural parameters and working parameters of the vertical mixing ball mill.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.9
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