基于离散单元法的立轴冲击破碎机成砂率数值计算

Numerical calculation of sand formation rate of vertical shaft impact crusher based on discrete element method

基于离散单元法对岩石破碎进行数值模拟分析,建立了立轴冲击破碎机物理模型和颗粒粘接模型。然后,选取砧铁安装角度a、叶轮转速n、中心入料量Q、砧铁安装中心距a为研究变量,分别进行了单因素、正交试验分析,以颗粒粘接键断裂数目、颗粒速度、标准差及颗粒分布作为评价指标,对立轴冲击破碎机成砂率的影响进行了显著性分析,并对数据进行多元非线性回归计算,得到了破碎机成砂率的一般规律。最后,通过实验对比验证了数值仿真计算的合理性,1m制砂机的砧铁安装中心距为496mm、砧铁安装角度为45°时成砂率最高。

Based on the discrete element method for numerical simulation analysis of rock crushing, the physical model of the vertical shaft impact crusher and the particle bonding model are established The anvil installation angle α, impeller speed n, center feed quantity Q, and anvil installation center distance a are selected. In order to study the variables, single factor and orthogonal experimental analysis were carried out. The number of broken bond bonds, particle velocity, standard deviation and particle distribution were used as evaluation indicators to significantly influence the sand formation rate of the vertical shaft impact crusher. Analyze and perform multiple non-linear regression calculations on the data, and get the general law of sand formation rate of the crusher. Finally,the rationality of the numerical simulation calculation is verified through experimental comparison. The anvil installation center distance of the 1 m sand making machine is 496 mm, and the sand formation rate is the highest when the anvil installation angle is 45°.