振动模式对筛分过程影响机理研究.docVIP

 振动模式对筛分过程影响机理研究# 赵啦啦，刘初升，董海林* （中国矿业大学机电工程学院，徐州 221116） 5 10 摘要：利用三维离散元法(DEM)对不同振动模式下的颗粒筛分过程进行了数值模拟研究，分 析了相同工艺参数的直线、圆和椭圆振动筛分过程中筛面颗粒的运动特征及透筛规律。结果 表明，直线筛分时颗粒沿筛面方向的速度最快而筛分效率最低，圆筛分时颗粒速度最慢而筛 分效率最高。稳态筛分时，各振动模式下筛面颗粒的筛分效率均沿筛长方向逐渐增大，并且 圆筛分时的增幅最大，直线筛分时的增幅最小。筛下物中难筛颗粒体积含量沿筛长方向的增 幅均大于易筛颗粒，并且与圆和椭圆筛分相比，直线筛分时易筛颗粒和难筛颗粒的含量在筛 面前 3 段较多而后 2 段较少。 关键词：矿物加工工程；振动模式；筛分过程；颗粒；离散元法 中图分类号：TD921.3 15 Influence mechanism of vibration mode on screening process ZHAO Lala, LIU Chusheng, DONG Hailin (School of Mechanical and Electrical Engineering, China University of Mining Technology, Xuzhou 221116) 20 25 30 35 40 Abstract: Screening processes of particles in different vibration modes were simulated by means of 3D Discrete Element Method (3D-DEM). The motion characteristics and penetration rules of the particles on screen deck in linearly, circularly and elliptically vibrating screening processes with the same technological parameters were also analyzed. The results show that the traveling velocity of particles is the fastest, but the screening efficiency is the lowest in linearly screening mode. On the contrary, the circularly screening process gets the highest screening efficiency but the lowest traveling velocity of particles. In the stable state, screening efficiency of each screening mode increases gradually along the longitudinal direction of screen deck, and the increment of circularly screening mode is the largest while that of linearly screening mode is the least. The volume fraction increment of the near-mesh sized particles in undersize is larger than small-sized particles along the screen deck. Comparing with the circularly and elliptically screening mode, the linearly screening mode has more contents of the near-mesh sized and the small-sized particles on the first 3 sections of the deck and less on the last 2 sections. Key words: mineral processing engineering; vibration mode; screening process; particles; discrete element method 0 引言 筛分是一项复杂的颗粒分离工艺过程，在矿业加工等多个领域有着广泛地应用[1,2]。离