发布时间：2012-08-04 00:00:00 浏览次数：次
振动筛筛分过程的技术经(jing)济(ji)指标是筛分效(xiao)率和生产率。前者(zhe)为质量(liang)指标，后者(zhe)为数量(liang)指标。 它们之间有一定的关系，同(tong)时还与其(qi)他许多因(yin)素有关，这(zhei)些因(yin)素决定筛分的结(jie)果(guo)。
一、振动筛所筛(shai)分(fen)的(de)(de)物(wu)料(liao)的(de)(de)物(wu)理性质包括物(wu)料(liao)本(ben)身的(de)(de)粒度(du)组成、湿(shi)(shi)度(du)、含(han)(han)(han)泥(ni)量和粒子的(de)(de)形状等。当(dang)物(wu)料(liao)细粒含(han)(han)(han)量较大(da)时(shi)，筛(shai)子的(de)(de)生产率也(ye)大(da)。当(dang)物(wu)料(liao)的(de)(de)湿(shi)(shi)度(du)较大(da)时(shi)，筛(shai)分(fen)效率会降低(di)。但筛(shai)孔(kong)尺寸愈大(da)，水(shui)分(fen)影响(xiang)愈小(xiao)，所以对于含(han)(han)(han)水(shui)分(fen)较大(da)的(de)(de)湿(shi)(shi)物(wu)料(liao)，为了改善筛(shai)分(fen)过程，一般(ban)可以采(cai)用(yong)加大(da)筛(shai)孔(kong)的(de)(de)办法，或者采(cai)用(yong)湿(shi)(shi)式筛(shai)分(fen)。物(wu)料(liao)含(han)(han)(han)泥(ni)量大(da)（当(dang)含(han)(han)(han)泥(ni)量大(da)于8%时(shi)）应当(dang)采(cai)用(yong)湿(shi)(shi)式筛(shai)分(fen)，或预(yu)先洗矿。
二(er)、振动筛(shai)(shai)筛(shai)(shai)面(mian)(mian)(mian)(mian)性质(zhi)及其(qi)结构(gou)参数(shu)的影(ying)响振动筛(shai)(shai)是使(shi)粒(li)子和筛(shai)(shai)面(mian)(mian)(mian)(mian)作垂直运(yun)动，所以筛(shai)(shai)分(fen)(fen)效(xiao)(xiao)(xiao)率(lv)高，生(sheng)(sheng)产(chan)(chan)能力大(da)。而(er)粒(li)子与(yu)(yu)筛(shai)(shai)面(mian)(mian)(mian)(mian)相对运(yun)动主要是平行运(yun)动的平面(mian)(mian)(mian)(mian)振动筛(shai)(shai)等，其(qi)筛(shai)(shai)分(fen)(fen)效(xiao)(xiao)(xiao)率(lv)和生(sheng)(sheng)产(chan)(chan)能力都低(di)。对于(yu)一(yi)定(ding)的物料而(er)言，筛(shai)(shai)子的生(sheng)(sheng)产(chan)(chan)率(lv)和筛(shai)(shai)分(fen)(fen)效(xiao)(xiao)(xiao)率(lv)决(jue)定(ding)于(yu)筛(shai)(shai)孔(kong)尺寸。生(sheng)(sheng)产(chan)(chan)率(lv)取(qu)决(jue)于(yu)筛(shai)(shai)面(mian)(mian)(mian)(mian)宽度(du)，筛(shai)(shai)面(mian)(mian)(mian)(mian)宽生(sheng)(sheng)产(chan)(chan)率(lv)高, 筛(shai)(shai)分(fen)(fen)效(xiao)(xiao)(xiao)率(lv)取(qu)决(jue)于(yu)筛(shai)(shai)面(mian)(mian)(mian)(mian)长度(du)，筛(shai)(shai)面(mian)(mian)(mian)(mian)长筛(shai)(shai)分(fen)(fen)效(xiao)(xiao)(xiao)率(lv)高。一(yi)般长宽比为2,有效(xiao)(xiao)(xiao)的振动筛(shai)(shai)筛(shai)(shai)子面(mian)(mian)(mian)(mian)积(ji)（即筛(shai)(shai)孔(kong)面(mian)(mian)(mian)(mian)积(ji)与(yu)(yu)整个筛(shai)(shai)面(mian)(mian)(mian)(mian)面(mian)(mian)(mian)(mian)积(ji)之比）愈(yu)大(da)，则筛(shai)(shai)面(mian)(mian)(mian)(mian)的单(dan)位面(mian)(mian)(mian)(mian)积(ji)生(sheng)(sheng)产(chan)(chan)率(lv)和筛(shai)(shai)分(fen)(fen)效(xiao)(xiao)(xiao)率(lv)愈(yu)高,筛(shai)(shai)孔(kong)尺寸愈(yu)大(da)，则单(dan)位筛(shai)(shai)面(mian)(mian)(mian)(mian)的生(sheng)(sheng)产(chan)(chan)率(lv)越(yue)大(da)，筛(shai)(shai)分(fen)(fen)效(xiao)(xiao)(xiao)率(lv)越(yue)高。
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