筛面运动方式对筛分效果的影响  

Influence of screen surface movement on screening efficiency

作　　者：王新文[1] 马超[1] 刘春[1] 申泽芳 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《洁净煤技术》2014年第2期24-26,共3页Clean Coal Technology

摘　　要：建立了圆振动筛和直线振动筛的力学模型,并进行了动力学分析,得到了振动筛的运动方程,说明圆振动筛筛面接近质心处为圆运动,两端为椭圆运动,距离质心越远,椭圆长轴和短轴的差值越大;而直线振动筛筛面各点均为直线振动。研究了圆振动筛和直线振动筛筛面运动形式对筛分效果的影响,结果表明:圆振动筛大多采用"正八字"激振器布置方式,增加颗粒与筛孔比较的机会,有利于筛面的充分利用和透筛率的提高;圆振动筛筛面各点振动参数不同,适于粗颗粒分级和原煤筛分。直线振动筛筛面各点振动方向和振幅相同,物料进入筛面分层后有规律地沿筛面运动,不易打散,增加了底层物料与筛面的接触时间,有利于底层物料的透筛,适于物料的脱介、脱泥、脱水和细粒物料的筛分。Through mechanical analysis of vibrating screen model,achieve the motion equation of vibrating screen.The results show that the motion trail of vibrating sieve surface near the centroid is circulars.Both ends are elliptical motions,and farther away from the centroid,the greater of the difference between the long axis and the short axis is.However,the points of linear vibrating sieve＇s surface are linear vibrating.After studying the effects of screening of circular vibrating screen and linear vibrating sieve surface movement forms,find that most of circular vibrating screen use “positive eight character” exciter arrangement,and then increase the comparison frequency between particles and sieve,it is conducive to improving the screening rates and the full use of the screen surface.The vibrating parameters of different points of circular vibrating screen surface are different and they are suitable for coarse particles screening and raw coal screening.The direction of vibration and the amplitude of different points of linear vibrating screen are the same,so when the materials pass through the screen surface,they will be stratified,and then move along the screen surface regularly.Materials can＇t be broken up easily,increase the contact time between the screen surface and the bottom layer materials,and so it is conducive for the bottom layer materials to passing through the sieve.Linear vibrating screen is suitable for fine particles screening,dense medium draining,desliming and dehydration.

关 键 词：圆振动筛 直线振动筛 振动参数 力学模型 筛面运动 筛分效果 

分 类 号：TD452[矿业工程—矿山机电]