乳(ru)化液系(xi)(xi)統(tong)在冷(leng)(leng)軋系(xi)(xi)統(tong)中的(de)作用是對軋輥進行冷(leng)(leng)卻潤滑(hua),幫助軋制。乳(ru)化液系(xi)(xi)統(tong)主要(yao)由供(gong)乳(ru)系(xi)(xi)統(tong)、提升系(xi)(xi)統(tong)和(he)平床過濾系(xi)(xi)統(tong)三部(bu)分組成(cheng)(cheng),每個環節(jie)都有其獨立(li)的(de)油(you)箱和(he)泵(beng)組,各自形成(cheng)(cheng)體(ti)系(xi)(xi)。
干凈的乳化(hua)(hua)液經過(guo)對軋(ya)機(ji)進(jin)行冷卻后必然攜帶(dai)了一些鐵屑和(he)其它雜質,如果不經過(guo)過(guo)濾(lv)就再次(ci)循環(huan)使用(yong),必然使冷軋(ya)帶(dai)鋼的表面(mian)和(he)軋(ya)輥表面(mian)產生劃痕,造(zao)成嚴(yan)重(zhong)的產品質量問題(ti)。因(yin)此平床(chuang)過(guo)濾(lv)系統是(shi)乳化(hua)(hua)液系統中乳化(hua)(hua)液凈化(hua)(hua)的重(zhong)要環(huan)節。
乳(ru)化液(ye)經(jing)過反復使用(yong)(yong)(yong)必然存在(zai)一(yi)些(xie)懸浮(fu)物和雜質,平床(chuang)過濾(lv)(lv)系統的(de)(de)作用(yong)(yong)(yong)就是過濾(lv)(lv)這些(xie)雜質,使使用(yong)(yong)(yong)后的(de)(de)乳(ru)化液(ye)能夠再次(ci)過濾(lv)(lv),其原理是利用(yong)(yong)(yong)鋪在(zai)帶(dai)孔的(de)(de)鋼托板層(ceng)(ceng)上(shang)的(de)(de)過濾(lv)(lv)紙對乳(ru)液(ye)進(jin)行過濾(lv)(lv)。經(jing)過一(yi)段時(shi)間后,濾(lv)(lv)紙上(shang)方(fang)會(hui)積(ji)累(lei)一(yi)層(ceng)(ceng)雜質層(ceng)(ceng),隨著過濾(lv)(lv)雜質的(de)(de)增多,其密度(du)加大(da),在(zai)下方(fang)的(de)(de)真空(kong)箱中形成真空(kong),并(bing)且產生了一(yi)定的(de)(de)真空(kong)抽力。
平床(chuang)過濾系統的邏輯(ji)功能主要分(fen)為兩大部分(fen),一部分(fen)是(shi)自動啟(qi)動泵組(zu)程序,另(ling)一部分(fen)是(shi)自動走紙程序。
平床(chuang)過濾(lv)系統有4臺主泵用(yong)于從(cong)平床(chuang)的真空箱(xiang)吸出過濾(lv)后的乳液供(gong)給供(gong)乳系統。根據工藝(yi)要求(qiu),這4臺主泵的啟(qi)動(dong)個數和順序(xu)隨著液位的不(bu)同而變化。
在(zai)平床液(ye)位(wei)不(bu)斷上(shang)升的(de)過程中(zhong),當液(ye)位(wei)上(shang)升到(dao)“1個泵(beng)(beng)(beng)運(yun)行(xing)”位(wei)置(zhi)時(shi),系(xi)統啟動(dong)被定為頭(tou)泵(beng)(beng)(beng)的(de)主(zhu)泵(beng)(beng)(beng)。液(ye)位(wei)繼(ji)續(xu)上(shang)升到(dao)“2 個泵(beng)(beng)(beng)運(yun)行(xing)”位(wei)置(zhi)時(shi),系(xi)統就會啟動(dong)頭(tou)泵(beng)(beng)(beng)的(de)下(xia)一個主(zhu)泵(beng)(beng)(beng)。
隨著液(ye)(ye)(ye)位的(de)(de)繼續上(shang)升(sheng),另兩臺泵(beng)(beng)啟動(dong)。而液(ye)(ye)(ye)位的(de)(de)下(xia)降過程與(yu)上(shang)升(sheng)過程截(jie)然不同(tong),即使液(ye)(ye)(ye)位下(xia)降,也不減少相(xiang)應的(de)(de)運(yun)行泵(beng)(beng)數(shu),而是(shi)保持上(shang)升(sheng)過程中達到(dao)最高液(ye)(ye)(ye)位時運(yun)行的(de)(de)泵(beng)(beng)數(shu),直到(dao)泵(beng)(beng)組把高液(ye)(ye)(ye)位打到(dao)安全液(ye)(ye)(ye)位“無(wu)泵(beng)(beng)運(yun)行”位置(zhi)時,才將運(yun)行的(de)(de)泵(beng)(beng)數(shu)減少到(dao)1個。液(ye)(ye)(ye)位繼續下(xia)降至“液(ye)(ye)(ye)位空”位置(zhi)時,所有運(yun)行的(de)(de)主泵(beng)(beng)停(ting)(ting)止。需要說明(ming)的(de)(de)是(shi),停(ting)(ting)泵(beng)(beng)順(shun)序正(zheng)好與(yu)啟泵(beng)(beng)順(shun)序相(xiang)反,越后啟動(dong)的(de)(de)泵(beng)(beng)越先停(ting)(ting)止。
液(ye)(ye)位(wei)(wei)從“液(ye)(ye)位(wei)(wei)空(kong)”位(wei)(wei)置再次上升(sheng)時(shi),要輪換啟(qi)動的(de)頭泵(如果沒有損壞,一(yi)般為(wei)上次頭泵的(de)下一(yi)個(ge)泵)。
根據工藝要(yao)(yao)求,選擇(ze)頭泵(beng)(beng)(beng)(beng)時(shi)(shi)要(yao)(yao)進(jin)行輪(lun)換 ,以(yi)保證每(mei)臺(tai)泵(beng)(beng)(beng)(beng)都有一(yi)(yi)定的(de)(de)休息(xi)時(shi)(shi)間(jian)。基于這個(ge)思想(xiang),在(zai)對程序(xu)進(jin)行重(zhong)新(xin)設計時(shi)(shi)采用了語(yu)句表的(de)(de)方式來編寫泵(beng)(beng)(beng)(beng)組啟動 自(zi)動輪(lun)換主泵(beng)(beng)(beng)(beng)的(de)(de)運行邏輯塊,主要(yao)(yao)思想(xiang)是每(mei)一(yi)(yi)臺(tai)泵(beng)(beng)(beng)(beng)都有一(yi)(yi)個(ge)標(biao)(biao)志(zhi)位(wei)(wei)(wei)(wei)來記錄其在(zai)當次液(ye)位(wei)(wei)(wei)(wei)上升過程中(zhong)是否為頭泵(beng)(beng)(beng)(beng),如果是,則(ze)對應的(de)(de)標(biao)(biao)志(zhi)位(wei)(wei)(wei)(wei)置(zhi)為“1”,否則(ze)為“0”。所以(yi)在(zai)每(mei)一(yi)(yi)輪(lun)液(ye)位(wei)(wei)(wei)(wei)變化(hua)中(zhong),只有一(yi)(yi)臺(tai)泵(beng)(beng)(beng)(beng)標(biao)(biao)志(zhi)位(wei)(wei)(wei)(wei)為“l”。而當新(xin)一(yi)(yi)輪(lun)液(ye)位(wei)(wei)(wei)(wei)上升時(shi)(shi)(液(ye)位(wei)(wei)(wei)(wei)降(jiang)至“液(ye)位(wei)(wei)(wei)(wei)空”位(wei)(wei)(wei)(wei)置(zhi)后重(zhong)新(xin)上升),就去查找這個(ge)標(biao)(biao)志(zhi)位(wei)(wei)(wei)(wei),新(xin)的(de)(de)頭泵(beng)(beng)(beng)(beng)就為標(biao)(biao)志(zhi)位(wei)(wei)(wei)(wei)為“1”主泵(beng)(beng)(beng)(beng)的(de)(de)下一(yi)(yi)個(ge)泵(beng)(beng)(beng)(beng)。
自動走(zou)紙(zhi)(zhi)(zhi)(zhi)機(ji)(ji)(ji)構主(zhu)要(yao)(yao)由(you)走(zou)紙(zhi)(zhi)(zhi)(zhi)電(dian)機(ji)(ji)(ji)、卷(juan)紙(zhi)(zhi)(zhi)(zhi)機(ji)(ji)(ji)構(氣(qi)(qi)動閥(fa))、上(shang)(shang)(shang)(shang)(shang)吹(chui)(chui)閥(fa)、補(bu)(bu)償箱(xiang)(xiang)(xiang)及(ji)補(bu)(bu)償箱(xiang)(xiang)(xiang)閥(fa)所組成。平床過(guo)濾(lv)(lv)(lv)系統運行(xing)一(yi)段時(shi)間后,濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi)上(shang)(shang)(shang)(shang)(shang)就(jiu)會(hui)(hui)積累一(yi)定量的(de)(de)(de)雜質層(ceng)(ceng),平床的(de)(de)(de)過(guo)濾(lv)(lv)(lv)箱(xiang)(xiang)(xiang)被(bei)這(zhe)層(ceng)(ceng)濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi)及(ji)濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi)鋼(gang)(gang)托(tuo)板分成上(shang)(shang)(shang)(shang)(shang)下(xia)(xia)相對密閉的(de)(de)(de)兩層(ceng)(ceng),上(shang)(shang)(shang)(shang)(shang)一(yi)層(ceng)(ceng)存滿(man)了(le)從(cong)機(ji)(ji)(ji)架(jia)上(shang)(shang)(shang)(shang)(shang)回流的(de)(de)(de)臟(zang)(zang)(zang)的(de)(de)(de)乳(ru)液,下(xia)(xia)一(yi)層(ceng)(ceng)存放著經過(guo)濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi)過(guo)濾(lv)(lv)(lv)后干(gan)凈的(de)(de)(de)乳(ru)液。由(you)于(yu)主(zhu)泵(beng)直(zhi)(zhi)接(jie)(jie)從(cong)下(xia)(xia)一(yi)層(ceng)(ceng)打出(chu)乳(ru)液,就(jiu)造成了(le)下(xia)(xia)層(ceng)(ceng)真(zhen)(zhen)空(kong)箱(xiang)(xiang)(xiang)壓(ya)(ya)力(li)比上(shang)(shang)(shang)(shang)(shang)層(ceng)(ceng)臟(zang)(zang)(zang)乳(ru)液箱(xiang)(xiang)(xiang)壓(ya)(ya)力(li)小,形成乳(ru)液向下(xia)(xia)層(ceng)(ceng)真(zhen)(zhen)空(kong)箱(xiang)(xiang)(xiang)流動的(de)(de)(de)動力(li),同(tong)時(shi)也將(jiang)濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi)緊(jin)緊(jin)壓(ya)(ya)在了(le)真(zhen)(zhen)空(kong)箱(xiang)(xiang)(xiang)的(de)(de)(de)濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi)鋼(gang)(gang)托(tuo)盤(pan)上(shang)(shang)(shang)(shang)(shang)。繼續運行(xing),雜質會(hui)(hui)越積越多,這(zhe)時(shi)就(jiu)要(yao)(yao)更換(huan)一(yi)段新(xin)的(de)(de)(de)過(guo)濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi),從(cong)而保(bao)(bao)證系統正常運行(xing)。由(you)于(yu)形成的(de)(de)(de)壓(ya)(ya)力(li)使濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi)緊(jin)貼在濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi)鋼(gang)(gang)托(tuo)盤(pan)上(shang)(shang)(shang)(shang)(shang),更換(huan)濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi)時(shi),需(xu)要(yao)(yao)打開補(bu)(bu)償箱(xiang)(xiang)(xiang)通向真(zhen)(zhen)空(kong)箱(xiang)(xiang)(xiang)的(de)(de)(de)閥(fa)門,將(jiang)補(bu)(bu)償箱(xiang)(xiang)(xiang)里的(de)(de)(de)乳(ru)液直(zhi)(zhi)接(jie)(jie)注入(ru)真(zhen)(zhen)空(kong)箱(xiang)(xiang)(xiang)里,達到上(shang)(shang)(shang)(shang)(shang)下(xia)(xia)兩層(ceng)(ceng)壓(ya)(ya)力(li)基本平衡。另(ling)外 ,還有空(kong)氣(qi)(qi)管路直(zhi)(zhi)接(jie)(jie)接(jie)(jie)到濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)下(xia)(xia)方(fang) ,打開上(shang)(shang)(shang)(shang)(shang)吹(chui)(chui)閥(fa),可(ke)向上(shang)(shang)(shang)(shang)(shang)吹(chui)(chui)空(kong)氣(qi)(qi),幫助濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi)懸浮(fu)在鋼(gang)(gang)托(tuo)盤(pan)上(shang)(shang)(shang)(shang)(shang),有利于(yu)走(zou)紙(zhi)(zhi)(zhi)(zhi)電(dian)機(ji)(ji)(ji)的(de)(de)(de)運行(xing),保(bao)(bao)證濾(lv)(lv)(lv)紙(zhi)(zhi)(zhi)(zhi)在走(zou)紙(zhi)(zhi)(zhi)(zhi)過(guo)程中不(bu)被(bei)抻斷。卷(juan)紙(zhi)(zhi)(zhi)(zhi)機(ji)(ji)(ji)構延(yan)時(shi)啟動,配合走(zou)紙(zhi)(zhi)(zhi)(zhi)電(dian)機(ji)(ji)(ji)自動卷(juan)起臟(zang)(zang)(zang)紙(zhi)(zhi)(zhi)(zhi)。
自動(dong)走紙(zhi)機(ji)構(gou)(gou)運行(xing)過程需要有一定的(de)順序(xu),走紙(zhi)機(ji)構(gou)(gou)各(ge)部分動(dong)作均有一定的(de)時(shi)間(jian)間(jian)隔。兩次走紙(zhi)運行(xing)之間(jian)的(de)間(jian)隔時(shi)間(jian)需要人工根據不同品(pin)牌(pai)的(de)濾紙(zhi)性能來進行(xing)設定。
自(zi)動(dong)走紙機構(gou)的啟(qi)動(dong)方(fang)式主要有三種(zhong):
一為程(cheng)序邏輯計(ji)算時(shi)間(jian),根據操(cao)作人員(yuan)所(suo)設定的時(shi)間(jian)間(jian)隔自(zi)動(dong)啟動(dong);
二(er)是生產人員按(an)下現(xian)場的(de)啟(qi)(qi)動(dong)按(an)鈕,只要條件滿(man)足就可以隨時啟(qi)(qi)動(dong);
三(san)是在(zai)特殊情況下,由于某種原因導致長時間(jian)不走紙(zhi)而(er)造成(cheng)真空箱中的壓力小于-120kPa時,走紙(zhi)機構自動啟動。