夜涩

　　篩(shai)(shai)(shai)分(fen)(fen)(fen)(fen)(fen)過程的(de)(de)技(ji)術(shu)經濟指標(biao)是篩(shai)(shai)(shai)分(fen)(fen)(fen)(fen)(fen)效(xiao)率和(he)生產率，前(qian)者(zhe)為(wei)(wei)質量(liang)指標(biao)，后者(zhe)為(wei)(wei)數(shu)量(liang)指標(biao)。它們(men)之間有一(yi)定的(de)(de)關系，同時(shi)還與其(qi)他(ta)許多因素(su)有關，這(zhe)些因素(su)決定篩(shai)(shai)(shai)分(fen)(fen)(fen)(fen)(fen)的(de)(de)結(jie)果。影響篩(shai)(shai)(shai)分(fen)(fen)(fen)(fen)(fen)過程的(de)(de)因素(su)大體可(ke)以(yi)分(fen)(fen)(fen)(fen)(fen)三類：包括(kuo)物(wu)料本身的(de)(de)粒(li)(li)度(du)(du)組(zu)成(cheng)、濕(shi)(shi)(shi)度(du)(du)、含(han)泥(ni)量(liang)和(he)粒(li)(li)子的(de)(de)形狀等。當物(wu)料細粒(li)(li)含(han)量(liang)較大時(shi)，篩(shai)(shai)(shai)子的(de)(de)生產率也大。當物(wu)料的(de)(de)濕(shi)(shi)(shi)度(du)(du)較大時(shi)，一(yi)般(ban)(ban)來說篩(shai)(shai)(shai)分(fen)(fen)(fen)(fen)(fen)效(xiao)率都會降低(di)。但篩(shai)(shai)(shai)孔尺(chi)寸愈大，水(shui)分(fen)(fen)(fen)(fen)(fen)影響愈小(xiao)，所以(yi)對于(yu)含(han)水(shui)分(fen)(fen)(fen)(fen)(fen)較大的(de)(de)濕(shi)(shi)(shi)物(wu)料，為(wei)(wei)了改善篩(shai)(shai)(shai)分(fen)(fen)(fen)(fen)(fen)過程，一(yi)般(ban)(ban)可(ke)以(yi)采(cai)用(yong)加大篩(shai)(shai)(shai)孔的(de)(de)辦法，或(huo)(huo)者(zhe)采(cai)用(yong)濕(shi)(shi)(shi)式篩(shai)(shai)(shai)分(fen)(fen)(fen)(fen)(fen)。物(wu)料含(han)泥(ni)量(liang)大（當含(han)泥(ni)量(liang)大于(yu)8%時(shi)）應當采(cai)用(yong)濕(shi)(shi)(shi)式篩(shai)(shai)(shai)分(fen)(fen)(fen)(fen)(fen)，或(huo)(huo)預先洗礦。

　　篩面結構參(can)數(shu)的影響(xiang)

　　直線(xian)篩(shai)(shai)(shai)(shai)(shai)是使粒(li)子和(he)篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)(mian)作垂(chui)直運動，所以篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)效率(lv)(lv)(lv)高(gao)，生(sheng)產(chan)能(neng)力大。而(er)粒(li)子與篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)(mian)相對(dui)運動主要是平行運動的(de)棒條篩(shai)(shai)(shai)(shai)(shai)、平面(mian)(mian)(mian)(mian)(mian)振動篩(shai)(shai)(shai)(shai)(shai)、筒篩(shai)(shai)(shai)(shai)(shai)等，其篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)效率(lv)(lv)(lv)和(he)生(sheng)產(chan)能(neng)力都低(di)。對(dui)于(yu)(yu)一定的(de)物(wu)料(liao)而(er)言，篩(shai)(shai)(shai)(shai)(shai)子的(de)生(sheng)產(chan)率(lv)(lv)(lv)和(he)篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)效率(lv)(lv)(lv)決(jue)(jue)定于(yu)(yu)篩(shai)(shai)(shai)(shai)(shai)孔尺寸(cun)。生(sheng)產(chan)率(lv)(lv)(lv)取決(jue)(jue)于(yu)(yu)篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)(mian)寬度，篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)(mian)寬生(sheng)產(chan)率(lv)(lv)(lv)高(gao)。篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)效率(lv)(lv)(lv)取決(jue)(jue)于(yu)(yu)篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)(mian)長(chang)度，篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)(mian)長(chang)篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)效率(lv)(lv)(lv)高(gao)。一般長(chang)寬比為2。有效的(de)篩(shai)(shai)(shai)(shai)(shai)子面(mian)(mian)(mian)(mian)(mian)積（即篩(shai)(shai)(shai)(shai)(shai)孔面(mian)(mian)(mian)(mian)(mian)積與整個篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)(mian)面(mian)(mian)(mian)(mian)(mian)積之比）愈大，則(ze)(ze)篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)(mian)的(de)單位面(mian)(mian)(mian)(mian)(mian)積生(sheng)產(chan)率(lv)(lv)(lv)和(he)篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)效率(lv)(lv)(lv)愈高(gao)。篩(shai)(shai)(shai)(shai)(shai)孔尺寸(cun)愈大，則(ze)(ze)單位篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)(mian)的(de)生(sheng)產(chan)率(lv)(lv)(lv)越(yue)大，篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)效率(lv)(lv)(lv)越(yue)高(gao)。

　　生產條件的影響(xiang)

　　當篩(shai)(shai)子(zi)的(de)(de)負(fu)荷較大(da)時(shi)，篩(shai)(shai)分效率(lv)(lv)低。在很(hen)大(da)程度(du)上(shang)圓振(zhen)動篩(shai)(shai)篩(shai)(shai)子(zi)的(de)(de)和平率(lv)(lv)取決于篩(shai)(shai)孔大(da)小(xiao)和總(zong)篩(shai)(shai)分效率(lv)(lv)；篩(shai)(shai)孔愈大(da)，要求篩(shai)(shai)分效率(lv)(lv)愈低時(shi)，則生產率(lv)(lv)愈高(gao)(gao)。給料(liao)均勻性(xing)對篩(shai)(shai)分過(guo)程意義很(hen)大(da)。篩(shai)(shai)子(zi)的(de)(de)傾(qing)角要適(shi)宜(yi)，一(yi)般通(tong)過(guo)試驗來確定。再就是篩(shai)(shai)子(zi)的(de)(de)振(zhen)幅與振(zhen)次，這與篩(shai)(shai)子(zi)的(de)(de)結構物性(xing)有關(guan)，在一(yi)定的(de)(de)范圍內(nei)，增加振(zhen)動可(ke)以(yi)提高(gao)(gao)篩(shai)(shai)分指(zhi)標。

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