影響振動篩工作效率的相關因素--篩面結構參數

1、篩面長度與寬度

一般認為,篩面寬度直接影響生產率,而篩面長度直接影響篩分效率(lv)(lv)。篩(shai)(shai)面(mian)(mian)(mian)寬,面(mian)(mian)(mian)積增加,生(sheng)產(chan)率(lv)(lv)提高。篩(shai)(shai)面(mian)(mian)(mian)長(chang),物(wu)料(liao)在篩(shai)(shai)面(mian)(mian)(mian)上停留時(shi)間(jian)長(chang),透(tou)篩(shai)(shai)機會多(duo),所(suo)以篩(shai)(shai)分效率(lv)(lv)高,但也不是(shi)越(yue)長(chang)越(yue)好,因為(wei)篩(shai)(shai)分效率(lv)(lv)與(yu)物(wu)料(liao)在整個篩(shai)(shai)面(mian)(mian)(mian)上經(jing)歷的(de)時(shi)間(jian)之(zhi)間(jian)的(de)關系是(shi)復(fu)雜(za)的(de),在開始時(shi)刻,由于篩(shai)(shai)面(mian)(mian)(mian)上的(de)細粒級物(wu)料(liao)較多(duo),單位時(shi)間(jian)內的(de)透(tou)篩(shai)(shai)概率(lv)(lv)較大(da),透(tou)篩(shai)(shai)率(lv)(lv)較高。

當經(jing)過時間后,留(liu)在篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)上的(de)物料(liao)(liao)粒徑多數為接(jie)近篩(shai)(shai)(shai)(shai)(shai)孔尺寸(cun)的(de)難(nan)篩(shai)(shai)(shai)(shai)(shai)物料(liao)(liao),即(ji)(ji)使物料(liao)(liao)在篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)上停留(liu)再長(chang)時間(即(ji)(ji)篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)的(de)長(chang)度很大),也(ye)(ye)(ye)很難(nan)提(ti)高(gao)物料(liao)(liao)的(de)透篩(shai)(shai)(shai)(shai)(shai)率,從而導(dao)致(zhi)工作效(xiao)(xiao)率。因此,選取(qu)合(he)適(shi)的(de)篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)長(chang)度可以提(ti)高(gao)篩(shai)(shai)(shai)(shai)(shai)分(fen)效(xiao)(xiao)率。實際上,篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)寬度對于篩(shai)(shai)(shai)(shai)(shai)分(fen)效(xiao)(xiao)率,篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)長(chang)度對于篩(shai)(shai)(shai)(shai)(shai)分(fen)能力也(ye)(ye)(ye)都有(you)不同程(cheng)度的(de)影口向,二(er)者的(de)匹配也(ye)(ye)(ye)很重要(yao),一般寬長(chang)比為1:2~1:3為宜。

2、篩孔形狀

雖然(ran)篩(shai)(shai)(shai)孔(kong)(kong)形(xing)(xing)(xing)(xing)狀主(zhu)要取決于(yu)對篩(shai)(shai)(shai)分(fen)產物粒(li)(li)度和對篩(shai)(shai)(shai)下產品用途的(de)(de)(de)要求,但對篩(shai)(shai)(shai)分(fen)效率(lv)也有的(de)(de)(de)影(ying)響。圓形(xing)(xing)(xing)(xing)篩(shai)(shai)(shai)孔(kong)(kong)與其他形(xing)(xing)(xing)(xing)狀的(de)(de)(de)篩(shai)(shai)(shai)孔(kong)(kong)相(xiang)比(bi),在(zai)名(ming)義(yi)尺寸(cun)相(xiang)同(tong)(tong)的(de)(de)(de)情況下,透(tou)(tou)過(guo)(guo)圓形(xing)(xing)(xing)(xing)篩(shai)(shai)(shai)孔(kong)(kong)的(de)(de)(de)篩(shai)(shai)(shai)下物粒(li)(li)度較小,例如透(tou)(tou)過(guo)(guo)圓形(xing)(xing)(xing)(xing)篩(shai)(shai)(shai)孔(kong)(kong)顆(ke)粒(li)(li)的(de)(de)(de)平(ping)均大(da)(da)粒(li)(li)度只有透(tou)(tou)過(guo)(guo)同(tong)(tong)樣(yang)尺寸(cun)的(de)(de)(de)正方形(xing)(xing)(xing)(xing)篩(shai)(shai)(shai)孔(kong)(kong)顆(ke)粒(li)(li)的(de)(de)(de)80%~95%o而長方形(xing)(xing)(xing)(xing)篩(shai)(shai)(shai)孑l的(de)(de)(de)篩(shai)(shai)(shai)面(mian)(mian)面(mian)(mian)積大(da)(da),篩(shai)(shai)(shai)面(mian)(mian)質量輕,生產能力大(da)(da),同(tong)(tong)時(shi)透(tou)(tou)過(guo)(guo)篩(shai)(shai)(shai)孔(kong)(kong)的(de)(de)(de)物料(liao)粒(li)(li)度大(da)(da)于(yu)透(tou)(tou)過(guo)(guo)名(ming)義(yi)尺寸(cun)相(xiang)同(tong)(tong)的(de)(de)(de)圓形(xing)(xing)(xing)(xing)和正方形(xing)(xing)(xing)(xing)篩(shai)(shai)(shai)孔(kong)(kong)的(de)(de)(de)物料(liao)粒(li)(li)度。因(yin)此,為了(le)獲(huo)得更高的(de)(de)(de)篩(shai)(shai)(shai)分(fen)效率(lv),須針對不(bu)同(tong)(tong)的(de)(de)(de)篩(shai)(shai)(shai)分(fen)物料(liao)選擇不(bu)同(tong)(tong)的(de)(de)(de)篩(shai)(shai)(shai)孔(kong)(kong)形(xing)(xing)(xing)(xing)狀。

3、篩孔尺寸和篩面的開孔率

在篩(shai)分物(wu)料的(de)(de)(de)情況下,篩(shai)孔(kong)尺(chi)(chi)寸對(dui)篩(shai)分效率影響很大(da)。篩(shai)孔(kong)尺(chi)(chi)寸越大(da),物(wu)料粒(li)的(de)(de)(de)透篩(shai)能(neng)(neng)力越強,振動篩(shai)的(de)(de)(de)處理(li)能(neng)(neng)力亦就越大(da),當(dang)然,篩(shai)孔(kong)尺(chi)(chi)寸主要由(you)被篩(shai)物(wu)料的(de)(de)(de)工藝要求決定。篩(shai)面(mian)的(de)(de)(de)開(kai)孔(kong)率是指篩(shai)面(mian)開(kai)孔(kong)面(mian)積(ji)與篩(shai)面(mian)面(mian)積(ji)的(de)(de)(de)比值(zhi)(面(mian)積(ji)系數)。開(kai)孔(kong)率高則(ze)增大(da)了(le)物(wu)料顆粒(li)透篩(shai)的(de)(de)(de)概(gai)率,振動篩(shai)的(de)(de)(de)處理(li)能(neng)(neng)力就高。反之,振動篩(shai)的(de)(de)(de)處理(li)能(neng)(neng)力則(ze)低(di)。因此,為了(le)提高篩(shai)分效率,應選擇面(mian)積(ji)系數較大(da)的(de)(de)(de)篩(shai)面(mian)。

4、篩面的材料

非金(jin)屬(shu)篩(shai)(shai)(shai)(shai)面(mian)(mian),如橡膠分級篩(shai)(shai)(shai)(shai)面(mian)(mian)、聚胺(an)脂(zhi)編織型分級篩(shai)(shai)(shai)(shai)面(mian)(mian)、聚胺(an)脂(zhi)條縫篩(shai)(shai)(shai)(shai)面(mian)(mian)、尼龍篩(shai)(shai)(shai)(shai)面(mian)(mian)等,由于這些非金(jin)屬(shu)材料(liao)(liao)的特性使篩(shai)(shai)(shai)(shai)分過程中產(chan)生(sheng)二次高頻振動,使堵(du)孔現象很難發(fa)生(sheng),有利于物料(liao)(liao)的透篩(shai)(shai)(shai)(shai),比金(jin)屬(shu)篩(shai)(shai)(shai)(shai)面(mian)(mian)的振動篩(shai)(shai)(shai)(shai)的處理效(xiao)率有所提高。