物料(liao)篩(shai)分不到位(wei),不僅(jin)會降低成品(pin)物料(liao)的品(pin)質,更會造成很(hen)大的浪費,影(ying)響生產效益(yi)。如何提(ti)高(gao)振(zhen)動(dong)篩(shai)篩(shai)分效果(guo)?在使用振(zhen)動(dong)篩(shai)進行篩(shai)分作業時,可(ke)根據實際情況,結(jie)合物料(liao)的特(te)性以及振(zhen)動(dong)篩(shai)的特(te)點采取合理(li)措(cuo)施(shi),在保(bao)證處理(li)能力的前提(ti)下提(ti)高(gao)其(qi)振(zhen)動(dong)篩(shai)的篩(shai)分效果(guo)。
影響振動篩篩分效率(lv)的因素:物(wu)料因素、設(she)備因素。其中物(wu)料因素又有物(wu)料含水量、堆積(ji)密度、粒度、顆粒形(xing)狀4各方面(mian)影響篩分效果。
1.物料(liao)含(han)(han)水(shui)量:在進(jin)行干法篩(shai)分時,物料(liao)含(han)(han)水(shui)率高或(huo)者濕(shi)潤性與粘附性好的物料(liao)更(geng)容易凝聚、結塊,造成篩(shai)孔堵塞,使篩(shai)分效率大大降低。
2.物(wu)料堆積密度:在物(wu)料堆積密度較大的情況下,振動篩(shai)篩(shai)分能力與堆積密度成正比(bi)關(guan)系。
3.物(wu)料(liao)(liao)粒(li)度:物(wu)料(liao)(liao)中含易(yi)篩(shai)(shai)粒(li)越多,物(wu)料(liao)(liao)越容易(yi)篩(shai)(shai)分,反之(zhi)物(wu)料(liao)(liao)越難(nan)篩(shai)(shai)分,粒(li)徑d=1~1.5a(a為篩(shai)(shai)孔尺寸 )的顆粒(li)易(yi)卡(ka)在振動(dong)篩(shai)(shai)篩(shai)(shai)孔中,稱阻礙粒(li),影響物(wu)料(liao)(liao)通過篩(shai)(shai)孔。因此,物(wu)料(liao)(liao)含難(nan)篩(shai)(shai)粒(li)、阻礙粒(li)越多,振動(dong)篩(shai)(shai)的篩(shai)(shai)分效(xiao)率就越低。
4.物(wu)料(liao)顆粒形(xing)(xing)狀(zhuang):當(dang)物(wu)料(liao)的(de)(de)(de)顆粒形(xing)(xing)狀(zhuang)為(wei)(wei)球形(xing)(xing)時,易通(tong)過(guo)(guo)方孔(kong)(kong)和(he)圓孔(kong)(kong)振動(dong)篩,而當(dang)物(wu)料(liao)的(de)(de)(de)顆粒形(xing)(xing)狀(zhuang)為(wei)(wei)條形(xing)(xing)、片狀(zhuang)以(yi)及多角形(xing)(xing)時會較難通(tong)過(guo)(guo)方孔(kong)(kong)和(he)圓孔(kong)(kong)篩,但較易通(tong)過(guo)(guo)長方形(xing)(xing)孔(kong)(kong)的(de)(de)(de)篩孔(kong)(kong)。
除了物(wu)料因(yin)素(su)還有設(she)備因(yin)素(su)會影響無聊(liao)的篩(shai)分(fen)結果(guo)(guo),好的廠家振動篩(shai)的篩(shai)面(mian)(mian)和篩(shai)孔(kong)(kong)以及傾斜角度等細節會更加精(jing)準,也(ye)會根據客(ke)戶(hu)不同的下料類型(xing)進行量(liang)(liang)身定制。能大大的降低損耗(hao),提高篩(shai)分(fen)效果(guo)(guo)和出料質量(liang)(liang)。設(she)備因(yin)素(su)具體分(fen)為篩(shai)面(mian)(mian)尺寸、篩(shai)面(mian)(mian)傾角、開孔(kong)(kong)率、篩(shai)孔(kong)(kong)形狀
1.篩面(mian)尺寸。篩面(mian)的長寬比過(guo)(guo)大(da)過(guo)(guo)小時,都會使篩分(fen)效率(lv)降低。振動篩篩面(mian)的長寬比應(ying)在合適范圍內,一(yi)般為 2.5~3。
2.篩(shai)(shai)(shai)面傾(qing)角(jiao)。篩(shai)(shai)(shai)面的傾(qing)角(jiao)過(guo)小,生產能力會(hui)降低;傾(qing)角(jiao)過(guo)大,則篩(shai)(shai)(shai)分效率(lv)會(hui)降低。因此,設置合(he)適的振動篩(shai)(shai)(shai)傾(qing)角(jiao)至關(guan)重要,振動篩(shai)(shai)(shai)傾(qing)角(jiao)一(yi)般為0°~ 25°,而固(gu)定(ding)篩(shai)(shai)(shai)傾(qing)角(jiao)一(yi)般為 40°~ 45°。
3.開孔率(lv)。振(zhen)動篩(shai)篩(shai)板(ban)的篩(shai)孔面(mian)積與篩(shai)面(mian)面(mian)積的比值稱為開孔率(lv),開孔率(lv)大的篩(shai)板(ban)篩(shai)分(fen)效率(lv)高、生產能(neng)力大,但相對(dui)篩(shai)板(ban)的強度低、壽命短。
4.篩(shai)孔(kong)(kong)形(xing)(xing)狀(zhuang)。篩(shai)孔(kong)(kong)的形(xing)(xing)狀(zhuang)不同,物料(liao)的通過能力相差很大。因(yin)此,在選(xuan)擇振動篩(shai)時,應注意篩(shai)板的篩(shai)孔(kong)(kong)型式應與物料(liao)的生產(chan)線物料(liao)的顆粒形(xing)(xing)狀(zhuang)相適應。
如何提高振動(dong)(dong)篩(shai)(shai)(shai)(shai)(shai)篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)效(xiao)果?答案是(shi):應合理的(de)(de)(de)控制加(jia)料量,避免過多或過少(shao)。加(jia)料時(shi)應連續均勻(yun)地加(jia)料,使物料沿篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)均勻(yun)分(fen)(fen)布,這(zhe)樣能(neng)有效(xiao)保證較(jiao)高的(de)(de)(de)生產能(neng)力和篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)效(xiao)率。在某些情(qing)況下,振動(dong)(dong)篩(shai)(shai)(shai)(shai)(shai)入(ru)料不(bu)是(shi)沿全(quan)篩(shai)(shai)(shai)(shai)(shai)寬給入(ru),會造(zao)成篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)不(bu)能(neng)充分(fen)(fen)利用,因此(ci)在工作中要認真檢測及時(shi)的(de)(de)(de)調(diao)整入(ru)料方式。篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)效(xiao)率不(bu)理想時(shi),可考慮調(diao)整振動(dong)(dong)篩(shai)(shai)(shai)(shai)(shai)篩(shai)(shai)(shai)(shai)(shai)機的(de)(de)(de)傾(qing)角(jiao),適當(dang)的(de)(de)(de)傾(qing)角(jiao)有利于(yu)(yu)(yu)減少(shao)物料厚度。提高振動(dong)(dong)篩(shai)(shai)(shai)(shai)(shai)篩(shai)(shai)(shai)(shai)(shai)板的(de)(de)(de)開(kai)(kai)孔率,高開(kai)(kai)孔率有利于(yu)(yu)(yu)改善篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)效(xiao)果,通常(chang)不(bu)銹鋼焊(han)接篩(shai)(shai)(shai)(shai)(shai)板開(kai)(kai)孔率高。降低振動(dong)(dong)篩(shai)(shai)(shai)(shai)(shai)篩(shai)(shai)(shai)(shai)(shai)面(mian)(mian)堵孔率,可考慮選用帶自(zi)清理功能(neng)的(de)(de)(de)篩(shai)(shai)(shai)(shai)(shai)板。相對(dui)于(yu)(yu)(yu)干(gan)法篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen),采用濕法篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)的(de)(de)(de)篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen)效(xiao)果要較(jiao)好(hao)一些。對(dui)于(yu)(yu)(yu)干(gan)法篩(shai)(shai)(shai)(shai)(shai)分(fen)(fen),要嚴格控制入(ru)料水分(fen)(fen)。
物料篩分是礦(kuang)山、化工廠(chang)、水泥廠(chang)等行業(ye)生產中的重要環(huan)節,使用振動篩時(shi)進(jin)行上(shang)述分析,進(jin)行設備(bei)這些調整,篩分出的物料效果會更好(hao)!