料层挤压粉磨数学模型构建及参数辨析

Building Mathematic Model and Discusing Parameter About the Grinding of Crushing Material Bed

从分析现行3种料层挤压粉碎设备粉磨过程的共性特征入手,建立了挤压通道数学模型;推导出这3种设备的临界钳入角只跟通道与物料间的磨擦系数有关的结果,据此计算得到:当物料与挤压通道摩擦系数不变时,筒辊磨承压面压力角θ3是筒径、辊径之比值k的函数;理论分析与试验表明:工业生产中的筒辊磨,k值不宜大于2;筒辊磨有着比立磨、辊压磨大得多的承压面压力角,因而比辊压磨、立磨有较高的抗冲击振动性和粉磨稳定性。

Beginning with analyzing current generic technology from the grinding process of the crushing equipment for three kinds of mills crushing material bed, it builds the mathematical model of grinding channels, as well as deduces the conclusion that the critical clamping angle for three kinds of equipments is only relating to the coefficient of friction between the channels and the materials. Rely on this, it can deduce the conclusion： When the coefficient of friction between the grinding channels and the materials is invariable, the pressure angle θ3 of the pressure-bearing surface for the horomill is the function of ratio about the shell diameter with the roller diameter. The theoretical analysis and the test result indicate： The value of k for the horomill used in cement industry is not suitable to be more than 2; The pressure angle of the pressure-bearing surface for the horomill is much bigger than the pressure angle of the pressure-bearing surface for the roller mill and the crush presser, therefore, the characteristic anti vibration and the grinding stability of horomill is higher than of crush presser and roller mill.