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提高直線振動篩篩選分級效率的途徑

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  提高直線振動篩篩(shai)選分級效(xiao)率(lv)的途徑(jing)

  篩(shai)選(xuan)分級(ji)(ji)的(de)(de)(de)目標(biao)是(shi)(shi)希望篩(shai)子喂(wei)料中(zhong)不(bu)(bu)(bu)過(guo)(guo)篩(shai)眼(yan)的(de)(de)(de)粒級(ji)(ji)進入(ru)篩(shai)下產(chan)物,但是(shi)(shi)在行業(ye)生(sheng)產(chan)條件下,要(yao)達(da)到(dao)這一(yi)目標(biao)是(shi)(shi)很困難(nan)的(de)(de)(de),而篩(shai)上(shang)產(chan)物中(zhong)或(huo)多或(huo)少總含(han)有一(yi)部分不(bu)(bu)(bu)過(guo)(guo)篩(shai)眼(yan)的(de)(de)(de)細粒,為了評價篩(shai)選(xuan)分級(ji)(ji)做出的(de)(de)(de)完水準,引入(ru)篩(shai)選(xuan)分級(ji)(ji)效(xiao)率(lv),即指實際的(de)(de)(de)篩(shai)選(xuan)分級(ji)(ji)產(chan)物中(zhong)與喂(wei)料中(zhong)所含(han)不(bu)(bu)(bu)過(guo)(guo)篩(shai)眼(yan)的(de)(de)(de)物料質(zhi)量(liang)之(zhi)比,怎樣提高(gao)直線振動篩(shai)篩(shai)選(xuan)分級(ji)(ji)效(xiao)率(lv)不(bu)(bu)(bu)斷是(shi)(shi)選(xuan)礦廠粉碎(sui)車(che)間的(de)(de)(de)主(zhu)要(yao)問題之(zhi)一(yi)。

  提高篩選分級效率的途徑可從(cong)如下(xia)幾方面入手(shou):

  1、采取大規格篩子

  大型直(zhi)線振動(dong)篩(shai)(shai)(shai)增加了(le)振動(dong)力(li)以(yi)及振動(dong)幅度,使篦條對物料的沖擊應(ying)力(li)以(yi)及剪(jian)切(qie)應(ying)力(li)拓寬以(yi)克服礦粒之間(jian)的黏著力(li),也(ye)減輕了(le)篩(shai)(shai)(shai)網表面的堵機,使被篩(shai)(shai)(shai)物料快捷符合松(song)散(san)、分層以(yi)及透篩(shai)(shai)(shai),因(yin)為篩(shai)(shai)(shai)子(zi)作(zuo)業條件的修改,提高(gao)了(le)篩(shai)(shai)(shai)選分級效率。

  2、增加直(zhi)線振動(dong)篩(shai)篩(shai)選(xuan)分級(ji)面(mian)積

  直(zhi)線振動篩(shai)篩(shai)選(xuan)(xuan)分(fen)(fen)級(ji)(ji)實驗表明(ming),減輕單位(wei)篩(shai)網(wang)表面上(shang)物料量(liang)可(ke)修改篩(shai)選(xuan)(xuan)分(fen)(fen)級(ji)(ji)效(xiao)(xiao)率,當(dang)(dang)篩(shai)網(wang)表面上(shang)實際物料量(liang)為篩(shai)子能力的約80%時(shi),篩(shai)子篩(shai)選(xuan)(xuan)分(fen)(fen)級(ji)(ji)效(xiao)(xiao)率高,當(dang)(dang)用篩(shai)子做分(fen)(fen)級(ji)(ji)機械(xie)時(shi),因為細粒級(ji)(ji)多,應有盡量(liang)篩(shai)選(xuan)(xuan)分(fen)(fen)級(ji)(ji)面積以(yi)(yi)及(ji)適當(dang)(dang)加長篩(shai)網(wang)表面,使(shi)長寬比在2:1以(yi)(yi)上(shang)便(bian)于(yu)提高篩(shai)選(xuan)(xuan)分(fen)(fen)級(ji)(ji)效(xiao)(xiao)率。

  3、采取合理的傾斜度

  控制物料(liao)在(zai)篩(shai)(shai)網(wang)表(biao)面上(shang)的(de)流(liu)動速(su)度,通(tong)常(chang)講,傾斜(xie)度大篩(shai)(shai)網(wang)表(biao)面上(shang)物料(liao)運動速(su)度快、生產(chan)需求(qiu)大,但(dan)是效率(lv)偏低(di),要獲取較高篩(shai)(shai)選分級效率(lv),物料(liao)在(zai)篩(shai)(shai)網(wang)表(biao)面上(shang)運動速(su)度通(tong)常(chang)控制在(zai)0.6m/S以下,故篩(shai)(shai)網(wang)表(biao)面要保持(chi)15,左(zuo)右的(de)傾斜(xie)度。

  4、采取等(deng)厚篩(shai)選分級法

  跟著篩(shai)(shai)選分級順序做出,直線(xian)(xian)振動(dong)篩(shai)(shai)篩(shai)(shai)網(wang)(wang)表面上物料(liao)(liao)厚度(du)(du)從喂料(liao)(liao)端到(dao)排料(liao)(liao)端逐步變(bian)薄,引起篩(shai)(shai)網(wang)(wang)表面使(shi)(shi)用緊后松(song)的(de)不合理供應石料(liao)(liao)現(xian)象,為此(ci)可采(cai)取不同傾斜(xie)度(du)(du)的(de)折(zhe)線(xian)(xian)型篩(shai)(shai)網(wang)(wang)表面,以控制(zhi)物料(liao)(liao)在篩(shai)(shai)網(wang)(wang)表面各(ge)段有不一樣的(de)運動(dong)速(su)度(du)(du),使(shi)(shi)礦(kuang)流坡(po)式向前流動(dong),從而(er)提高難篩(shai)(shai)粒子在排出端的(de)透篩(shai)(shai)機會。

  5、采取擴(kuo)大篩眼的(de)多層篩

  普通(tong)單(dan)層(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)篩(shai)(shai)(shai)喂料中“難篩(shai)(shai)(shai)粒(li)子”以及“阻(zu)礙粒(li)子”(過篩(shai)(shai)(shai)眼(yan)粒(li)子)幾乎從(cong)喂料端運動到排料端,從(cong)而影響(xiang)了(le)中、細(xi)粒(li)物(wu)料的分層(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)與透篩(shai)(shai)(shai),采取從(cong)下層(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)到上層(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)篩(shai)(shai)(shai)眼(yan)逐(zhu)步(bu)加大(da)、篩(shai)(shai)(shai)網(wang)表面(mian)傾斜度(du)(du)逐(zhu)步(bu)減(jian)小(xiao)的多(duo)層(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)篩(shai)(shai)(shai),即(ji)對不同細(xi)度(du)(du)的物(wu)料用(yong)不同傾斜度(du)(du)以及篩(shai)(shai)(shai)眼(yan)的篩(shai)(shai)(shai)網(wang)表面(mian),在上層(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)、中層(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)、下層(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)篩(shai)(shai)(shai)網(wang)表面(mian)上分別(bie)符合物(wu)料松散、分層(ceng)(ceng)(ceng)(ceng)(ceng)(ceng),預(yu)篩(shai)(shai)(shai)選分級以及細(xi)粒(li)篩(shai)(shai)(shai)選分級作用(yong),克服篩(shai)(shai)(shai)眼(yan)的堵機,提(ti)高(gao)篩(shai)(shai)(shai)選分級效率。

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