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)寬,面(mian)積增加,生產率(lv)(lv)提高。篩(shai)(shai)面(mian)長(chang),物(wu)料(liao)在(zai)篩(shai)(shai)面(mian)上(shang)停留時間長(chang),透篩(shai)(shai)機(ji)會(hui)多,所(suo)以篩(shai)(shai)分效率(lv)(lv)高,但也不是(shi)越長(chang)越好,因為篩(shai)(shai)分效率(lv)(lv)與(yu)物(wu)料(liao)在(zai)整個篩(shai)(shai)面(mian)上(shang)經歷的時間之間的關系是(shi)復雜的,在(zai)開(kai)始時刻,由(you)于篩(shai)(shai)面(mian)上(shang)的細粒(li)級物(wu)料(liao)較多,單位時間內(nei)的透篩(shai)(shai)概率(lv)(lv)較大,透篩(shai)(shai)率(lv)(lv)較高。

當(dang)經過(guo)時間后,留在(zai)篩面(mian)(mian)上(shang)的(de)物料粒徑(jing)多數為接近篩孔尺寸(cun)的(de)難(nan)篩物料,即(ji)使物料在(zai)篩面(mian)(mian)上(shang)停留再長(chang)時間(即(ji)篩面(mian)(mian)的(de)長(chang)度(du)很大),也很難(nan)提高物料的(de)透(tou)篩率(lv),從而導(dao)致工作效(xiao)(xiao)率(lv)。因此,選取合適的(de)篩面(mian)(mian)長(chang)度(du)可以提高篩分(fen)效(xiao)(xiao)率(lv)。實際上(shang),篩面(mian)(mian)寬度(du)對(dui)于(yu)篩分(fen)效(xiao)(xiao)率(lv),篩面(mian)(mian)長(chang)度(du)對(dui)于(yu)篩分(fen)能力(li)也都有不同程度(du)的(de)影口向,二者的(de)匹配也很重要,一般寬長(chang)比為1:2~1:3為宜。

2、篩孔形狀

雖然篩(shai)(shai)(shai)(shai)孔(kong)(kong)形(xing)(xing)(xing)狀主(zhu)要取決于對(dui)(dui)篩(shai)(shai)(shai)(shai)分(fen)產(chan)物粒(li)(li)(li)度和(he)對(dui)(dui)篩(shai)(shai)(shai)(shai)下(xia)產(chan)品用途的(de)(de)(de)(de)(de)要求,但對(dui)(dui)篩(shai)(shai)(shai)(shai)分(fen)效率也有的(de)(de)(de)(de)(de)影響。圓(yuan)(yuan)形(xing)(xing)(xing)篩(shai)(shai)(shai)(shai)孔(kong)(kong)與其(qi)他形(xing)(xing)(xing)狀的(de)(de)(de)(de)(de)篩(shai)(shai)(shai)(shai)孔(kong)(kong)相比,在名義尺寸(cun)(cun)相同(tong)的(de)(de)(de)(de)(de)情況(kuang)下(xia),透(tou)(tou)過圓(yuan)(yuan)形(xing)(xing)(xing)篩(shai)(shai)(shai)(shai)孔(kong)(kong)的(de)(de)(de)(de)(de)篩(shai)(shai)(shai)(shai)下(xia)物粒(li)(li)(li)度較(jiao)小,例(li)如透(tou)(tou)過圓(yuan)(yuan)形(xing)(xing)(xing)篩(shai)(shai)(shai)(shai)孔(kong)(kong)顆粒(li)(li)(li)的(de)(de)(de)(de)(de)平(ping)均大(da)粒(li)(li)(li)度只(zhi)有透(tou)(tou)過同(tong)樣尺寸(cun)(cun)的(de)(de)(de)(de)(de)正方形(xing)(xing)(xing)篩(shai)(shai)(shai)(shai)孔(kong)(kong)顆粒(li)(li)(li)的(de)(de)(de)(de)(de)80%~95%o而(er)長方形(xing)(xing)(xing)篩(shai)(shai)(shai)(shai)孑l的(de)(de)(de)(de)(de)篩(shai)(shai)(shai)(shai)面面積大(da),篩(shai)(shai)(shai)(shai)面質量(liang)輕,生(sheng)產(chan)能力(li)大(da),同(tong)時透(tou)(tou)過篩(shai)(shai)(shai)(shai)孔(kong)(kong)的(de)(de)(de)(de)(de)物料粒(li)(li)(li)度大(da)于透(tou)(tou)過名義尺寸(cun)(cun)相同(tong)的(de)(de)(de)(de)(de)圓(yuan)(yuan)形(xing)(xing)(xing)和(he)正方形(xing)(xing)(xing)篩(shai)(shai)(shai)(shai)孔(kong)(kong)的(de)(de)(de)(de)(de)物料粒(li)(li)(li)度。因此,為了(le)獲得更高(gao)的(de)(de)(de)(de)(de)篩(shai)(shai)(shai)(shai)分(fen)效率,須(xu)針對(dui)(dui)不(bu)同(tong)的(de)(de)(de)(de)(de)篩(shai)(shai)(shai)(shai)分(fen)物料選擇(ze)不(bu)同(tong)的(de)(de)(de)(de)(de)篩(shai)(shai)(shai)(shai)孔(kong)(kong)形(xing)(xing)(xing)狀。

3、篩孔尺寸和篩面的開孔率

在篩(shai)(shai)分物料的(de)情況下,篩(shai)(shai)孔(kong)尺(chi)寸(cun)對篩(shai)(shai)分效(xiao)(xiao)率(lv)(lv)(lv)(lv)影響很(hen)大。篩(shai)(shai)孔(kong)尺(chi)寸(cun)越大,物料粒的(de)透篩(shai)(shai)能(neng)(neng)力(li)越強,振動(dong)篩(shai)(shai)的(de)處(chu)理能(neng)(neng)力(li)亦就(jiu)越大,當然,篩(shai)(shai)孔(kong)尺(chi)寸(cun)主(zhu)要由被篩(shai)(shai)物料的(de)工(gong)藝要求(qiu)決定(ding)。篩(shai)(shai)面(mian)的(de)開孔(kong)率(lv)(lv)(lv)(lv)是指篩(shai)(shai)面(mian)開孔(kong)面(mian)積與篩(shai)(shai)面(mian)面(mian)積的(de)比值(zhi)(面(mian)積系(xi)數(shu))。開孔(kong)率(lv)(lv)(lv)(lv)高(gao)則增大了物料顆粒透篩(shai)(shai)的(de)概率(lv)(lv)(lv)(lv),振動(dong)篩(shai)(shai)的(de)處(chu)理能(neng)(neng)力(li)就(jiu)高(gao)。反之,振動(dong)篩(shai)(shai)的(de)處(chu)理能(neng)(neng)力(li)則低。因此,為了提高(gao)篩(shai)(shai)分效(xiao)(xiao)率(lv)(lv)(lv)(lv),應選(xuan)擇面(mian)積系(xi)數(shu)較大的(de)篩(shai)(shai)面(mian)。

4、篩面的材料

非(fei)(fei)金(jin)屬篩(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian),如橡膠分級(ji)篩(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)、聚胺(an)脂(zhi)編(bian)織型(xing)分級(ji)篩(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)、聚胺(an)脂(zhi)條縫(feng)篩(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)、尼龍(long)篩(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)等,由于這(zhe)些非(fei)(fei)金(jin)屬材(cai)料(liao)的特性使(shi)篩(shai)(shai)(shai)(shai)分過(guo)程(cheng)中(zhong)產生二(er)次高頻振動,使(shi)堵孔(kong)現(xian)象很難發生,有(you)(you)利于物料(liao)的透(tou)篩(shai)(shai)(shai)(shai),比金(jin)屬篩(shai)(shai)(shai)(shai)面(mian)(mian)(mian)(mian)的振動篩(shai)(shai)(shai)(shai)的處理效率有(you)(you)所提高。