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失(shi)(shi)重(zhong)(zhong)秤(cheng)(cheng)是九(jiu)十年代開(kai)始應(ying)(ying)(ying)用(yong)于(yu)(yu)工業(ye)過程稱重(zhong)(zhong)連續計(ji)(ji)量(liang)(liang)(liang)(liang)(liang)的(de)(de)(de)(de)(de)。失(shi)(shi)重(zhong)(zhong)秤(cheng)(cheng)逐漸(jian)(jian)替代皮帶秤(cheng)(cheng)、螺旋秤(cheng)(cheng)，甚(shen)至累加秤(cheng)(cheng)，作為(wei)(wei)(wei)(wei)(wei)一(yi)(yi)種(zhong)全(quan)新(xin)的(de)(de)(de)(de)(de)計(ji)(ji)量(liang)(liang)(liang)(liang)(liang)方法，逐漸(jian)(jian)應(ying)(ying)(ying)用(yong)到(dao)越來越多物料(liao)處理。1．基本原(yuan)理：將秤(cheng)(cheng)量(liang)(liang)(liang)(liang)(liang)斗及給料(liao)機(ji)構(gou)作為(wei)(wei)(wei)(wei)(wei)整(zheng)個(ge)秤(cheng)(cheng)體，通(tong)過儀表或上(shang)位(wei)機(ji)不(bu)(bu)停對(dui)秤(cheng)(cheng)體進行(xing)重(zhong)(zhong)量(liang)(liang)(liang)(liang)(liang)信(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)采樣，計(ji)(ji)算(suan)(suan)出重(zhong)(zhong)量(liang)(liang)(liang)(liang)(liang)在(zai)單(dan)位(wei)時(shi)(shi)(shi)(shi)間的(de)(de)(de)(de)(de)變(bian)化比(bi)率(lv)作為(wei)(wei)(wei)(wei)(wei)瞬時(shi)(shi)(shi)(shi)流(liu)量(liang)(liang)(liang)(liang)(liang)，再通(tong)過各種(zhong)軟(ruan)硬件的(de)(de)(de)(de)(de)濾波技(ji)術(shu)(shu)(shu)處理，得出可(ke)以(yi)作為(wei)(wei)(wei)(wei)(wei)控(kong)(kong)制(zhi)對(dui)象的(de)(de)(de)(de)(de)“實(shi)(shi)際流(liu)量(liang)(liang)(liang)(liang)(liang)”。這(zhe)個(ge)流(liu)量(liang)(liang)(liang)(liang)(liang)的(de)(de)(de)(de)(de)獲取非(fei)常(chang)重(zhong)(zhong)要(yao)，是失(shi)(shi)重(zhong)(zhong)秤(cheng)(cheng)能否準確計(ji)(ji)量(liang)(liang)(liang)(liang)(liang)的(de)(de)(de)(de)(de)基礎。圖中介紹的(de)(de)(de)(de)(de)是一(yi)(yi)種(zhong)經典(dian)的(de)(de)(de)(de)(de)方法：然后FC通(tong)過PID反饋(kui)算(suan)(suan)法，進行(xing)逼近目標(biao)流(liu)量(liang)(liang)(liang)(liang)(liang)的(de)(de)(de)(de)(de)控(kong)(kong)制(zhi)運算(suan)(suan)，輸(shu)(shu)出調(diao)節信(xin)(xin)號(hao)(hao)去控(kong)(kong)制(zhi)變(bian)頻器(qi)等(deng)給料(liao)機(ji)控(kong)(kong)制(zhi)器(qi)。2．差(cha)分減量(liang)(liang)(liang)(liang)(liang)秤(cheng)(cheng)（失(shi)(shi)重(zhong)(zhong)秤(cheng)(cheng)）在(zai)實(shi)(shi)際中的(de)(de)(de)(de)(de)應(ying)(ying)(ying)用(yong)：從原(yuan)理上(shang)可(ke)以(yi)看(kan)出它不(bu)(bu)受秤(cheng)(cheng)體與給料(liao)機(ji)構(gou)的(de)(de)(de)(de)(de)機(ji)械變(bian)化影響(xiang)，它只是計(ji)(ji)算(suan)(suan)重(zhong)(zhong)量(liang)(liang)(liang)(liang)(liang)差(cha)值（差(cha)重(zhong)(zhong)），與傳(chuan)統動(dong)態(tai)(tai)計(ji)(ji)量(liang)(liang)(liang)(liang)(liang)手段(duan)相比(bi)，其優(you)點是不(bu)(bu)言(yan)而(er)喻的(de)(de)(de)(de)(de)。對(dui)于(yu)(yu)控(kong)(kong)制(zhi)對(dui)象為(wei)(wei)(wei)(wei)(wei)流(liu)量(liang)(liang)(liang)(liang)(liang)（t/h,kg/min），而(er)且物料(liao)可(ke)輸(shu)(shu)送(song)性好，計(ji)(ji)量(liang)(liang)(liang)(liang)(liang)精(jing)度要(yao)求(qiu)高時(shi)(shi)(shi)(shi)，采用(yong)失(shi)(shi)重(zhong)(zhong)法計(ji)(ji)量(liang)(liang)(liang)(liang)(liang)可(ke)以(yi)作為(wei)(wei)(wei)(wei)(wei)一(yi)(yi)種(zhong)方案。3．失(shi)(shi)重(zhong)(zhong)秤(cheng)(cheng)設(she)計(ji)(ji)必(bi)須注意(yi)的(de)(de)(de)(de)(de)事項(xiang)，影響(xiang)精(jing)度的(de)(de)(de)(de)(de)因素：失(shi)(shi)重(zhong)(zhong)秤(cheng)(cheng)兼有靜(jing)態(tai)(tai)秤(cheng)(cheng)、動(dong)態(tai)(tai)秤(cheng)(cheng)特點，因此，在(zai)設(she)計(ji)(ji)系(xi)統時(shi)(shi)(shi)(shi)，要(yao)求(qiu)：正確的(de)(de)(de)(de)(de)輸(shu)(shu)送(song)率(lv)范(fan)(fan)圍(wei)(wei)，一(yi)(yi)般實(shi)(shi)際工作范(fan)(fan)圍(wei)(wei)為(wei)(wei)(wei)(wei)(wei)額定輸(shu)(shu)送(song)量(liang)(liang)(liang)(liang)(liang)的(de)(de)(de)(de)(de)60%~70%。若采用(yong)交流(liu)調(diao)速，對(dui)應(ying)(ying)(ying)變(bian)頻率(lv)為(wei)(wei)(wei)(wei)(wei)35-40Hz。這(zhe)樣保(bao)證(zheng)(zheng)調(diao)節范(fan)(fan)圍(wei)(wei)寬(kuan)。還由于(yu)(yu)在(zai)輸(shu)(shu)送(song)率(lv)過低時(shi)(shi)(shi)(shi)，系(xi)統穩定性差(cha)。傳(chuan)感(gan)器(qi)量(liang)(liang)(liang)(liang)(liang)程選用(yong)適當(dang)，按公式(shi)也便是說(shuo)，傳(chuan)感(gan)器(qi)也用(yong)到(dao)其量(liang)(liang)(liang)(liang)(liang)程的(de)(de)(de)(de)(de)60%~70%，信(xin)(xin)號(hao)(hao)變(bian)化范(fan)(fan)圍(wei)(wei)寬(kuan)，對(dui)提高精(jing)度極為(wei)(wei)(wei)(wei)(wei)有利。機(ji)械結(jie)構(gou)設(she)計(ji)(ji)要(yao)確保(bao)物料(liao)流(liu)動(dong)性好，同(tong)時(shi)(shi)(shi)(shi)保(bao)證(zheng)(zheng)補料(liao)時(shi)(shi)(shi)(shi)間短，補料(liao)不(bu)(bu)應(ying)(ying)(ying)過于(yu)(yu)頻繁，一(yi)(yi)般要(yao)求(qiu)5-10分鐘補一(yi)(yi)次(ci)料(liao)。配套傳(chuan)動(dong)系(xi)統要(yao)保(bao)證(zheng)(zheng)運行(xing)平(ping)穩，線性好。4．應(ying)(ying)(ying)用(yong)前景：隨著電子控(kong)(kong)制(zhi)技(ji)術(shu)(shu)(shu)的(de)(de)(de)(de)(de)飛速發展，失(shi)(shi)重(zhong)(zhong)秤(cheng)(cheng)通(tong)過采用(yong)新(xin)的(de)(de)(de)(de)(de)技(ji)術(shu)(shu)(shu)，在(zai)計(ji)(ji)量(liang)(liang)(liang)(liang)(liang)精(jing)度上(shang)由0.3%~0.5%。而(er)提高到(dao)0.1%~0.2%，甚(shen)至到(dao)超過靜(jing)態(tai)(tai)秤(cheng)(cheng)，這(zhe)一(yi)(yi)新(xin)技(ji)術(shu)(shu)(shu)的(de)(de)(de)(de)(de)核心即(ji)數字式(shi)稱重(zhong)(zhong)傳(chuan)感(gan)器(qi)的(de)(de)(de)(de)(de)應(ying)(ying)(ying)用(yong)。