糧食輸送機電機的選擇
更新時間:2019-03-05 關注:1046
電(dian)機(ji)(ji)(ji)在糧(liang)食(shi)(shi)輸(shu)送(song)(song)機(ji)(ji)(ji)中可以(yi)稱得上(shang)是一個(ge)非常重要(yao)的(de)(de)部件,它是帶(dai)動整(zheng)個(ge)糧(liang)食(shi)(shi)輸(shu)送(song)(song)機(ji)(ji)(ji)運(yun)轉(zhuan)的(de)(de)關鍵。因此選擇好電(dian)機(ji)(ji)(ji)對糧(liang)食(shi)(shi)輸(shu)送(song)(song)機(ji)(ji)(ji)來說是至(zhi)關重要(yao)的(de)(de)。不只是因為(wei)(wei)其自(zi)身的(de)(de)正常運(yun)轉(zhuan)有必要(yao)還因為(wei)(wei)糧(liang)食(shi)(shi)輸(shu)送(song)(song)機(ji)(ji)(ji)的(de)(de)電(dian)機(ji)(ji)(ji)能(neng)否正常工(gong)作(zuo)關系(xi)著整(zheng)個(ge)糧(liang)食(shi)(shi)輸(shu)送(song)(song)機(ji)(ji)(ji)的(de)(de)正常運(yun)轉(zhuan)和(he)工(gong)作(zuo)效率。電(dian)動機(ji)(ji)(ji)作(zuo)為(wei)(wei)糧(liang)食(shi)(shi)輸(shu)送(song)(song)機(ji)(ji)(ji)的(de)(de)驅動裝(zhuang)置,在選用的(de)(de)時候盡量(liang)選用有短(duan)路裝(zhuang)置的(de)(de)電(dian)機(ji)(ji)(ji),這樣做的(de)(de)原因是因為(wei)(wei)有短(duan)路裝(zhuang)置的(de)(de)電(dian)機(ji)(ji)(ji)有一定的(de)(de)保護(hu)裝(zhuang)置,主要(yao)體現在以(yi)下幾點。
1、短路保護宜采(cai)用熔(rong)斷器或低壓(ya)斷路器的瞬(shun)動過電流(liu)脫扣器,也可(ke)采(cai)用瞬(shun)動元(yuan)件的過電流(liu)繼電器。熔(rong)斷器至少(shao)在兩相(xiang)上裝設。
2、熔斷器(qi)(qi)熔斷體的(de)(de)額定電(dian)流應大于電(dian)動(dong)機的(de)(de)額定電(dian)流,且其安秒特性曲線計算(suan)偏差后,略(lve)高于電(dian)動(dong)機啟動(dong)電(dian)流和(he)啟動(dong)時間的(de)(de)交點(dian)。如(ru)電(dian)動(dong)機啟動(dong)頻繁,熔斷體的(de)(de)額定電(dian)流再加大1~2級(ji)。瞬時電(dian)流脫扣器(qi)(qi)或(huo)過電(dian)流繼電(dian)器(qi)(qi)瞬動(dong)元件的(de)(de)整定電(dian)流,應取電(dian)動(dong)機啟動(dong)電(dian)流的(de)(de)2~2.5倍。
3、熱(re)繼電(dian)(dian)器(qi)(qi)(qi)或(huo)過載(zai)脫(tuo)扣器(qi)(qi)(qi)的整定電(dian)(dian)流(liu),不小(xiao)于電(dian)(dian)動(dong)機額定電(dian)(dian)流(liu),其值(zhi)應(ying)接(jie)近額定值(zhi)。控制電(dian)(dian)器(qi)(qi)(qi)宜采用(yong)接(jie)觸(chu)器(qi)(qi)(qi)、啟(qi)動(dong)器(qi)(qi)(qi)或(huo)專用(yong)開關,一組(zu)電(dian)(dian)動(dong)機可共用(yong)一套控制電(dian)(dian)器(qi)(qi)(qi),控制電(dian)(dian)器(qi)(qi)(qi)應(ying)能接(jie)通和斷開電(dian)(dian)動(dong)機的堵轉電(dian)(dian)流(liu)。
4、連續運行的帶(dai)式輸送機,采(cai)(cai)用(yong)熔斷器(qi)(qi)(qi)保(bao)護(hu)或(huo)短路器(qi)(qi)(qi)保(bao)護(hu),宜(yi)裝(zhuang)設(she)斷相(xiang)熱繼電器(qi)(qi)(qi)保(bao)護(hu)或(huo)溫度保(bao)護(hu)。低壓(ya)保(bao)護(hu)器(qi)(qi)(qi)宜(yi)采(cai)(cai)用(yong)低壓(ya)斷路器(qi)(qi)(qi)的欠(qian)電壓(ya)脫扣器(qi)(qi)(qi)或(huo)接(jie)觸器(qi)(qi)(qi)的電磁線圈(quan),其(qi)控(kong)制回路宜(yi)采(cai)(cai)用(yong)電動機主回路供電。電動機及(ji)其(qi)控(kong)制電器(qi)(qi)(qi)宜(yi)共用(yong)一(yi)套隔離(li)器(qi)(qi)(qi)。
5、低壓(ya)交(jiao)流(liu)電(dian)動(dong)(dong)機(ji)的回路(lu)上應(ying)在每臺電(dian)動(dong)(dong)機(ji)上裝隔離(li)電(dian)器,或(huo)共用一套(tao)短路(lu)保護的一組電(dian)動(dong)(dong)機(ji)共用一套(tao)隔離(li)電(dian)器。電(dian)動(dong)(dong)機(ji)主回路(lu)導線(xian)的載流(liu)量不應(ying)小于電(dian)動(dong)(dong)機(ji)的額定電(dian)流(liu),并(bing)對其機(ji)械強度、電(dian)壓(ya)和在短路(lu)條件的熱穩定性進行校驗。
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