基于离散元法的双卧轴搅拌机工作性能的分析与研究

Analysis and Research on Working Performance of Double Horizontal Shaft Mixer Based on Discrete Element Method

为提高双卧轴搅拌机的搅拌均匀性,研究搅拌机的运动参数与几何参数的最优组合,对其搅拌过程进行分析并建立双卧轴搅拌机的离散元模型。采用二次回归正交旋转组合试验设计,运用离散元软件EDEM对搅拌机搅拌均匀性进行正交虚拟试验。以离散率作为搅拌均匀性的评价指标,对试验结果进行回归分析,并应用SPSS软件得到各个试验因素的回归方程,利用Matlab绘制三维等值线图,确定了各参数对性能指标的影响规律。对试验因素进行优化计算,得出最优参数组合:当搅拌轴转速为61.93 r/min,筒毂直径为38.02 mm,叶片螺旋升角为46.34°时,搅拌机离散率为6.22%。采用试验验证了仿真结果,证明了应用离散元法研究搅拌机工作性能的可行性。

In order to improve the stirring uniformity of the double horizontal shaft mixer,the optimal combination of motion parameters and geometric parameters of the mixer was studied.The stirring process was analyzed and the discrete element model of the double horizontal shaft mixer was established.The quadratic regression orthogonal rotational combination experiment design was adopted,and the orthogonal virtual experiment of stirring uniformity was carried out by using the discrete element software EDEM.Taking the discrete rate as the evaluation index of stirring uniformity,the regression analysis of the test results was carried out and the regression equation of each test factor was obtained by SPSS software.The three-dimensional contour map was drawn by using Matlab,and the influence law of each parameter on the performance index was determined.The optimum parameter combination was obtained by optimizing the experimental factors.When the rotational speed of the agitator shaft was 61.93 r/min,the diameter of the cylinder hub was 38.02 mm,and the helical angle of the blade was 46.34 degrees,the dispersing rate of the agitator was 6.22%.The simulation results are verified by experiments,and the feasibility of using the discrete element method to study the performance of the mixer is proved.