鏈式輸送機的起動性能有哪些
起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)問(wen)(wen)題是鏈式(shi)(shi)輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)機。尤(you)其是大(da)型(xing)鏈板式(shi)(shi)輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)機的(de)(de)關鍵問(wen)(wen)題。它不僅關系(xi)(xi)到輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)機的(de)(de)起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)性能(neng)。還直接影響到輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)機的(de)(de)經濟(ji)效益。就(jiu)我國目前的(de)(de)鏈板式(shi)(shi)輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)機而(er)(er)言。使用(yong) 多(duo)(duo)的(de)(de)驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)(dong)系(xi)(xi)統(tong)(tong)為：電(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機一(yi)液力(li)耦合(he)器(qi)一(yi)減速(su)(su)器(qi)一(yi)驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)(dong)滾筒(tong)—輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)帶(dai)。當(dang)用(yong)于長距離、高速(su)(su)度(du)、大(da)運量的(de)(de)鏈板式(shi)(shi)輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)機時(shi)(shi)(shi)。這(zhe)樣(yang)的(de)(de)驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)(dong)系(xi)(xi)統(tong)(tong)會產(chan)生(sheng)(sheng)如下問(wen)(wen)題： （1）起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)產(chan)生(sheng)(sheng)的(de)(de)瞬態(tai)(tai)張力(li)高達數(shu)(shu)倍(bei)的(de)(de)正(zheng)(zheng)常(chang)運行的(de)(de)穩(wen)態(tai)(tai)張力(li)。上述驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)(dong)系(xi)(xi)統(tong)(tong)起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)間(jian)過(guo)短(duan)(duan)。根據對(dui)使用(yong)中(zhong)的(de)(de)數(shu)(shu)臺鏈輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)機的(de)(de)測定(ding)。一(yi)般起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)間(jian)為l-3s.因(yin)(yin)此(ci)起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)加(jia)速(su)(su)度(du)較大(da)。這(zhe)樣(yang)對(dui)輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)帶(dai)緊(jin)邊(bian)會產(chan)生(sheng)(sheng)很大(da)的(de)(de)沖(chong)(chong)擊(ji)(ji)。由(you)此(ci)而(er)(er)產(chan)生(sheng)(sheng)明顯的(de)(de)動(dong)(dong)(dong)(dong)張力(li)。其數(shu)(shu)值可(ke)達正(zheng)(zheng)常(chang)運行時(shi)(shi)(shi)的(de)(de)數(shu)(shu)倍(bei)。容易(yi)產(chan)生(sheng)(sheng)斷帶(dai)事(shi)故。為了(le)保證(zheng)運行的(de)(de)正(zheng)(zheng)常(chang)性。必須提(ti)高輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)帶(dai)的(de)(de)強度(du)等級。從(cong)而(er)(er)大(da)大(da)增加(jia)了(le)初期投資(zi)。 （2）起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)易(yi)打滑。由(you)于鏈板輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)饑是一(yi)個大(da)慣性體。若起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)間(jian)過(guo)短(duan)(duan)。勢必要有較大(da)的(de)(de)驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)(dong)力(li)矩(ju)才能(neng)滿足需要。因(yin)(yin)此(ci)。易(yi)出現(xian)(xian)打滑現(xian)(xian)象。尤(you)其是滿載(zai)情況下。更容易(yi)發生(sheng)(sheng)。為了(le)保證(zheng)不打滑，必須提(ti)高張緊(jin)裝置(zhi)的(de)(de)張緊(jin)力(li)。這(zhe)使相(xiang)關部件的(de)(de)受力(li)增加(jia)。要求強度(du)、剛度(du)更大(da)。這(zhe)從(cong)另一(yi)方面提(ti)高了(le)初期投資(zi)。 （3）電(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機功率增加(jia)、電(dian)(dian)(dian)網沖(chong)(chong)擊(ji)(ji)大(da)。由(you)于起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)力(li)矩(ju)大(da)。起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)間(jian)短(duan)(duan)。這(zhe)使得所需電(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機功率增大(da)。能(neng)耗增加(jia)。而(er)(er)且對(dui)電(dian)(dian)(dian)網的(de)(de)沖(chong)(chong)擊(ji)(ji)也增大(da)。為了(le)使驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)(dong)系(xi)(xi)統(tong)(tong)消除或減小上述缺陷。國內(nei)外(wai)科技工作者進行了(le)大(da)量的(de)(de)工作。研究了(le)多(duo)(duo)種多(duo)(duo)樣(yang)的(de)(de)驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)(dong)系(xi)(xi)統(tong)(tong)；實現(xian)(xian)起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)過(guo)程速(su)(su)度(du)變化曲線(xian)可(ke)調。
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