皮帶秤的故障(zhang)分(fen)析及(ji)判斷

　　1、稱重傳感器

　　稱重傳(chuan)感器(qi)常有的(de)有壓(ya)力及拉力兩種形(xing)式。  ±Exc為激勵端，此電(dian)(dian)(dian)壓(ya)由儀(yi)表(biao)提供，應(ying)為10VDC±5%，±Sen為補(bu)償端，此電(dian)(dian)(dian)壓(ya)與±Exc一致(zhi)。±Sig為信號(hao)(hao)輸出端，大(da)小應(ying)為0至20mv之(zhi)間某一值。正常使用(yong)時，皮帶空(kong)載(zai)時輸出不超(chao)過15mv，并且隨著載(zai)荷的(de)增(zeng)加而(er)增(zeng)大(da)。因此判(pan)斷稱重傳(chuan)感器(qi)的(de)好壞(huai)最直接的(de)方(fang)法就是(shi)萬用(yong)表(biao)的(de)直流(liu)電(dian)(dian)(dian)壓(ya)檔測量(liang)，首先保(bao)證±Exc為10VDC±5%，如無此電(dian)(dian)(dian)壓(ya)檢查儀(yi)表(biao)；若有多(duo)個傳(chuan)感器(qi)，則拆下信號(hao)(hao)端，分別測量(liang)，保(bao)證每個傳(chuan)感器(qi)的(de)輸出均在(zai)0－20ｍV，且數值隨載(zai)荷的(de)增(zeng)加而(er)增(zeng)大(da)。  除電(dian)(dian)(dian)壓(ya)判(pan)斷外(wai)，還可以通過測量(liang)輸入輸出電(dian)(dian)(dian)阻來判(pan)斷,具(ju)體方(fang)法為：±Exc (±Sen)為400Ω±5Ω，±Sig為350Ω±5Ω，且屏蔽線與任意一端子均大(da)于5000MΩ。

　　2、 測速傳感(gan)器

　　測速傳感(gan)器實際上(shang)是(shi)一個步進電(dian)(dian)(dian)(dian)(dian)機(ji)，其輸(shu)出(chu)信號頻率正(zheng)比(bi)于(yu)輸(shu)入軸的(de)(de)轉數(shu)，故(gu)用(yong)(yong)萬用(yong)(yong)表檢(jian)查時(shi)仍有兩種方法(fa)：  測量電(dian)(dian)(dian)(dian)(dian)阻(zu)法(fa)：用(yong)(yong)200Ω的(de)(de)電(dian)(dian)(dian)(dian)(dian)阻(zu)檔，測電(dian)(dian)(dian)(dian)(dian)阻(zu)應(ying)為(wei)135Ω±2Ω  測量電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)法(fa)：用(yong)(yong)20VAC檔測電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，當(dang)輸(shu)送機(ji)停止時(shi)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)為(wei)零，當(dang)輸(shu)送機(ji)正(zheng)常(chang)運(yun)轉時(shi)，電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)為(wei)3－10VAC中(zhong)的(de)(de)一值(zhi)，速度越大此值(zhi)越大。日(ri)常(chang)維護于(yu)檢(jian)修時(shi)應(ying)清(qing)掃(sao)速度傳感(gan)器于(yu)測速滾筒(tong)之間的(de)(de)連(lian)接軸套，該軸套是(shi)通過頂絲(si)把(ba)兩個軸耦合(he)連(lian)接在一起,故(gu)頂絲(si)松動或(huo)脫(tuo)落均影響正(zheng)常(chang)的(de)(de)測速，也會造成我(wo)們所測的(de)(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)值(zhi)不準(zhun)確。

　　3、儀表

　　檢測(ce)(ce)各信號的(de)功能，如(ru)發(fa)現故(gu)(gu)障(zhang)會隨時顯(xian)(xian)現在顯(xian)(xian)示屏上，當故(gu)(gu)障(zhang)消失后(hou)(hou)，必須對故(gu)(gu)障(zhang)顯(xian)(xian)示進行復位，才能使(shi)儀(yi)表(biao)解(jie)除(chu)故(gu)(gu)障(zhang)。儀(yi)表(biao)的(de)常(chang)見故(gu)(gu)障(zhang)有(you)：稱(cheng)重(zhong)傳感(gan)(gan)器故(gu)(gu)障(zhang)，測(ce)(ce)速(su)傳感(gan)(gan)器故(gu)(gu)障(zhang)，除(chu)法錯(cuo)誤等，如(ru)若儀(yi)表(biao)出(chu)(chu)現死機（這(zhe)是少有(you)的(de)現象(xiang)，但有(you)時難免會出(chu)(chu)現），則對儀(yi)表(biao)進行冷起動，使(shi)所有(you)數(shu)據恢復到出(chu)(chu)廠(chang)設定數(shu)據，需(xu)要對儀(yi)表(biao)重(zhong)新設定及標定后(hou)(hou)才能正(zheng)常(chang)使(shi)用。