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在常见的(de)制(zhi)砂生产线中振动筛(shai)(shai)(shai)(shai)(shai)(shai)的(de)筛(shai)(shai)(shai)(shai)(shai)(shai)分(fen)过(guo)程(cheng)(cheng)中，在不同粒(li)度混合(he)物(wu)(wu)中，大于筛(shai)(shai)(shai)(shai)(shai)(shai)孔(kong)(kong)孔(kong)(kong)径的(de)颗(ke)粒(li)称(cheng)为(wei)筛(shai)(shai)(shai)(shai)(shai)(shai)上(shang)颗(ke)粒(li)，小于筛(shai)(shai)(shai)(shai)(shai)(shai)孔(kong)(kong)孔(kong)(kong)径的(de)颗(ke)粒(li)称(cheng)为(wei)筛(shai)(shai)(shai)(shai)(shai)(shai)下物(wu)(wu)料(liao)(liao)(liao)。显然，筛(shai)(shai)(shai)(shai)(shai)(shai)上(shang)颗(ke)粒(li)是通不过(guo)筛(shai)(shai)(shai)(shai)(shai)(shai)孔(kong)(kong)的(de)，而(er)(er)筛(shai)(shai)(shai)(shai)(shai)(shai)下颗(ke)粒(li)首(shou)先(xian)要通过(guo)筛(shai)(shai)(shai)(shai)(shai)(shai)上(shang)颗(ke)粒(li)所组成(cheng)的(de)物(wu)(wu)料(liao)(liao)(liao)层到(dao)达筛(shai)(shai)(shai)(shai)(shai)(shai)面(mian)，然后再(zai)透过(guo)筛(shai)(shai)(shai)(shai)(shai)(shai)孔(kong)(kong)而(er)(er)完(wan)成(cheng)筛(shai)(shai)(shai)(shai)(shai)(shai)分(fen)过(guo)程(cheng)(cheng)。要使(shi)(shi)(shi)这两个步骤(zhou)得以实现(xian)，应该使(shi)(shi)(shi)筛(shai)(shai)(shai)(shai)(shai)(shai)面(mian)具有适当的(de)运动特(te)性。一(yi)方面(mian)使(shi)(shi)(shi)筛(shai)(shai)(shai)(shai)(shai)(shai)面(mian)上(shang)的(de)物(wu)(wu)料(liao)(liao)(liao)层成(cheng)松(song)散状(zhuang)态，使(shi)(shi)(shi)颗(ke)粒(li)的(de)间(jian)距变大，使(shi)(shi)(shi)筛(shai)(shai)(shai)(shai)(shai)(shai)上(shang)颗(ke)粒(li)不盖住筛(shai)(shai)(shai)(shai)(shai)(shai)孔(kong)(kong)，另一(yi)方面(mian)使(shi)(shi)(shi)筛(shai)(shai)(shai)(shai)(shai)(shai)下颗(ke)粒(li)克服各种摩擦力(li)，通过(guo)物(wu)(wu)料(liao)(liao)(liao)层并从筛(shai)(shai)(shai)(shai)(shai)(shai)孔(kong)(kong)中尽快(kuai)地排(pai)出。

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当筛面(mian)运动时，筛面(mian)上的(de)物料(liao)层(ceng)会产生(sheng)‘离(li)析(xi)(xi)”现(xian)象(xiang)——按粒(li)度分层(ceng)现(xian)象(xiang)。出(chu)于较(jiao)小的(de)颗(ke)(ke)(ke)粒(li)容易通过(guo)较(jiao)大(da)(da)颗(ke)(ke)(ke)粒(li)所组成(cheng)的(de)物料(liao)层(ceng)，而较(jiao)大(da)(da)的(de)颗(ke)(ke)(ke)粒(li)不容易通过(guo)较(jiao)小颗(ke)(ke)(ke)粒(li)所组成(cheng)的(de)物科层(ceng)，所以“离(li)析(xi)(xi)”的(de)结果，总是较(jiao)大(da)(da)颗(ke)(ke)(ke)粒(li)处在物料(liao)顶(ding)层(ceng)，较(jiao)小颗(ke)(ke)(ke)粒(li)处在底层(ceng)的(de)筛而上。

经试验得出的(de)(de)结论是：粒(li)度(du)小(xiao)(xiao)于(yu)筛(shai)(shai)孔3/4的(de)(de)颗粒(li)是易筛(shai)(shai)粒(li)；粒(li)度(du)大(da)于(yu)筛(shai)(shai)孔3/4而(er)小(xiao)(xiao)于(yu)筛(shai)(shai)孔的(de)(de)颗粒(li)是难(nan)筛(shai)(shai)粒(li)，粒(li)度(du)大(da)于(yu)筛(shai)(shai)孔而(er)小(xiao)(xiao)于(yu)筛(shai)(shai)孔1.5倍的(de)(de)颗粒(li)是阻碍粒(li)；粒(li)度(du)大(da)子筛(shai)(shai)孔1.5倍的(de)(de)颗粒(li)对其它粒(li)子的(de)(de)筛(shai)(shai)分(fen)过程(cheng)影响不大(da)。