基于离散元法的往复振动筛筛分效果研究

为寻找往复振动筛的最佳筛分参数,采用三维离散元软件PFC3D研究了筛分参数对筛分效果的影响规律。结果表明:筛上物输送量随振动频率、振幅和筛面倾角的增加均呈递增关系,随振动方向角的增加先增加后下降,在30°时达到最大值;筛分效率随振动频率、振幅和筛面倾角的增加是先递增后下降,振动频率和振幅对筛分效率的影响最为显著,筛分效率随振动方向角的增加分别在35°和45°时经历了2个峰值;综合考虑筛分效率和筛上物输送量,振动频率取为14Hz、振幅为3.5mm、振动方向角为35°及筛面倾角为10°~12°时,振动筛可以取得较好的筛分效果。

Research on Screening Results of Reciprocating Vibration Screen Based on Discrete Element Method

In order to find the best screening parameters of reciprocating vibrating screen, the effects of screening param-eters on the screening effect were researched based on the three-dimensional discrete element software PFC3 D.Results shown that, conveying capacity of the oversize product increased as the vibration frequency, amplitude, screen surface inclination increased.Conveying capacity of the oversize product first increased and then decreased with the screen sur-face inclination increased, the maximum was occurred at 30°.Screening efficiency firstly increased and then decreased with the vibration frequency, amplitude, screen surface inclination increased.The effect of vibration frequency and am-plitude on the screening efficiency was most significant.With the increase of vibrating direction angle, the screening effi-ciency experienced two peak at 35°and 45°respectively.Considering the screening efficiency and production efficiency, vibration frequency is 14Hz, amplitude is 3.5mm, vibrating direction angle is 35°and screen surface inclination is 10-12°, the vibrating screen can get a good screening effect.