Research on Multi Parameter Optimization of Variable Amplitude Screening Based on DEM

To improve the screening apparatus and screen surface structure to address the viscous and wet properties of raw coal with high moisture content, a cascade sorting screen surface with variable amplitude adjustment was employed for effective dry separation of dynamic raw coal. The primary objectives were to elucidate the distribution patterns of coal seam particles under various complex screening amplitude differences, systematically analyze the impact of uniform and stable distribution during the 6 mm raw coal screening process, and explore the spatiotemporal distribution characteristics of differential motion and equal-thickness separation of 6 mm dynamic coal particles. Using response surface methodology (RSM), it was demonstrated that the screening machine's classification efficiency was maximized when the power and screen structure were optimized, with the number of screen segments at 4.102, processing capacity at 17.625 t/h, and amplitude difference at 1.81 mm. Under these conditions, the RSM-predicted screening efficiency reached 93.645%. This represents the peak separation performance for raw coal products, enabling effective and thorough screening of power coal across different particle sizes, and provides theoretical guidance for scaling up raw coal production using machinery.