Discrete element simulation of coal particles screening on composite vibrating screen
In order to strengthen the stratification of mixed particles on the screen surface and improve the screening effect of traditional vibrating screens.According to the void-filling effect of mixed particles under vibration and based on the Lissajous vibration synthesis theory,a composite vibrating screen was proposed.The theoretical basis and working principle of the composite vibrating screen were explained and verified using the discrete element method.A comparative study of conventional vibrating screen and composite vibrating screen discrete element simulation was carried out with composite,linear,elliptical and circular vibrating screens with frequency,amplitude and vibration direction angle as variables,and the comparison results showed that the composite vibrating screen has more significant advantages in both screening efficiency and material handling.A composite vibrating screen can give the particle force along the width of the screen surface,and the excitation force acts on particle in the three directions along the xyz axles;the particle force is more diversified,the mixed particle system is looser,more active,leading to better stratification effect and ideal screening effect.
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