为了寻找振动筛的最佳运动学参数(振幅、频率、振动方向角),达到提高透筛效率并减少清选损失的目的,利用EDEM软件,对振动筛分过程进行数值模拟,得出在其他条件一定的情况下,随着振幅和频率的增加,物料沿筛面后移的速度增加,同时透筛效率增高,在振幅40 mm时和频率6 Hz时出现筛分损失;随着振动方向角的增大,在25°到45°范围内,物料沿筛面后移的速度增加,在45°时达到最大,超过45°之后,物料沿筛面后移的速度逐渐降低,而透筛效率在35°时最高,超过35°,透筛效率逐渐降低.模拟结果与试验测量结果总体趋势基本吻合,这表明了利用EDEM进行数值模拟的正确性和可行性.%In order to find the best kinematical parameters (amplitude, frequency, vibrating direction angle), to improve efficiency and reduce the loss, vibration screening process simulation was carried out by EDEM software.Simulation results showed that, as amplitude and frequency increased, longitudinal moving speed of the material and efficiency of the material passing through screen increased; the screening loss occurred at amplitude 40 mm and frequency 6 Hz.Within 25° to 45° range, longitudinal moving speed of the material increased as vibration direction angle increased, the maximum velocity was occurred at 45°; When vibration direction angle exceeded 45°, longitudinal moving speed of the material gradually decreased; Efficiency of the material passing through screen was the highest at 35°, which then gradually reduced with the vibration direction angle increased after 35。.Comparison of measured value with simulated value demonstrated adequate agreement.The numerical simulation by using EDEM has correctness and feasibility.
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