篩(shai)(shai)(shai)(shai)(shai)沙(sha)機的(de)(de)(de)(de)(de)目的(de)(de)(de)(de)(de)是希(xi)望篩(shai)(shai)(shai)(shai)(shai)子(zi)(zi)給(gei)料(liao)(liao)中(zhong)(zhong)(zhong)小于(yu)篩(shai)(shai)(shai)(shai)(shai)孔(kong)的(de)(de)(de)(de)(de)粒(li)級全(quan)部進(jin)入(ru)(ru)篩(shai)(shai)(shai)(shai)(shai)下(xia)產(chan)物，但在(zai)工業生(sheng)產(chan)條件(jian)下(xia)，要達到(dao)這一目的(de)(de)(de)(de)(de)是很困難(nan)的(de)(de)(de)(de)(de)，而篩(shai)(shai)(shai)(shai)(shai)上產(chan)物中(zhong)(zhong)(zhong)或多(duo)或少(shao)總含(han)有一些小于(yu)篩(shai)(shai)(shai)(shai)(shai)孔(kong)的(de)(de)(de)(de)(de)細(xi)粒(li)，為了評價(jia)篩(shai)(shai)(shai)(shai)(shai)分(fen)進(jin)行的(de)(de)(de)(de)(de)完(wan)全(quan)程度(du)，引入(ru)(ru)篩(shai)(shai)(shai)(shai)(shai)分(fen)效率(lv)，即指實際得(de)到(dao)的(de)(de)(de)(de)(de)篩(shai)(shai)(shai)(shai)(shai)分(fen)產(chan)物中(zhong)(zhong)(zhong)與(yu)給(gei)料(liao)(liao)中(zhong)(zhong)(zhong)所含(han)小于(yu)篩(shai)(shai)(shai)(shai)(shai)孔(kong)的(de)(de)(de)(de)(de)物料(liao)(liao)質量之比。 　　1)篩(shai)(shai)(shai)(shai)(shai)沙(sha)機采(cai)用大(da)規格篩(shai)(shai)(shai)(shai)(shai)子(zi)(zi)。大(da)型圓振動篩(shai)(shai)(shai)(shai)(shai)增加了振動力(li)和(he)振幅，使(shi)篩(shai)(shai)(shai)(shai)(shai)板(ban)對物料(liao)(liao)的(de)(de)(de)(de)(de)沖(chong)擊應(ying)力(li)和(he)剪切(qie)應(ying)力(li)增大(da)以(yi)克服(fu)礦(kuang)粒(li)之間(jian)的(de)(de)(de)(de)(de)黏著力(li)，也減少(shao)了篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)的(de)(de)(de)(de)(de)堵塞，使(shi)被篩(shai)(shai)(shai)(shai)(shai)物料(liao)(liao)快速完(wan)成松散(san)、分(fen)層(ceng)(ceng)和(he)透篩(shai)(shai)(shai)(shai)(shai)。由于(yu)篩(shai)(shai)(shai)(shai)(shai)子(zi)(zi)作業條件(jian)的(de)(de)(de)(de)(de)改善，提(ti)高(gao)了篩(shai)(shai)(shai)(shai)(shai)分(fen)效率(lv)。 　　2)篩(shai)(shai)(shai)(shai)(shai)沙(sha)機采(cai)用擴大(da)篩(shai)(shai)(shai)(shai)(shai)孔(kong)的(de)(de)(de)(de)(de)多(duo)層(ceng)(ceng)篩(shai)(shai)(shai)(shai)(shai)。從(cong)而影響了中(zhong)(zhong)(zhong)、細(xi)粒(li)物料(liao)(liao)的(de)(de)(de)(de)(de)分(fen)層(ceng)(ceng)與(yu)透篩(shai)(shai)(shai)(shai)(shai)。采(cai)用從(cong)下(xia)層(ceng)(ceng)到(dao)上層(ceng)(ceng)篩(shai)(shai)(shai)(shai)(shai)孔(kong)逐(zhu)漸加大(da)、篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)傾(qing)角逐(zhu)漸減小的(de)(de)(de)(de)(de)多(duo)層(ceng)(ceng)篩(shai)(shai)(shai)(shai)(shai)。即對不同粒(li)度(du)的(de)(de)(de)(de)(de)物料(liao)(liao)用不同傾(qing)角和(he)篩(shai)(shai)(shai)(shai)(shai)孔(kong)的(de)(de)(de)(de)(de)篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)，在(zai)上層(ceng)(ceng)、中(zhong)(zhong)(zhong)層(ceng)(ceng)、下(xia)層(ceng)(ceng)篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)上分(fen)別完(wan)成物料(liao)(liao)松散(san)、分(fen)層(ceng)(ceng)，預挖沙(sha)船和(he)細(xi)粒(li)篩(shai)(shai)(shai)(shai)(shai)分(fen)作用，克服(fu)篩(shai)(shai)(shai)(shai)(shai)孔(kong)的(de)(de)(de)(de)(de)堵塞，提(ti)高(gao)篩(shai)(shai)(shai)(shai)(shai)分(fen)效率(lv)。洗沙(sha)機