在zai高gao爐lu上shang料liao卷juan揚yang機ji上shang
，由you於yu該gai調tiao速su方fang式shi為wei轉zhuan子zi串chuan電dian阻zu調tiao速su
，頻pin繁fan啟qi動dong，啟qi動dong電dian流liu大da，電dian阻zu容rong易yi燒shao毀hui，料liao車che上shang料liao品pin種zhong不bu一yi樣yang，停ting車che減jian速su不bu平ping穩wen，減jian速su時shi間jian不bu易yi控kong製zhi
， 加上卷揚機鋼絲繩鬆緊程度不一致，有時出現料車“掛頂”shigu，yanzhongyingxiangleshengchan。zaibugaibianyuanlaigongrencaozuoxiguandeqiantixia，baoliuyuanlaicaozuokongzhitaijikongzhixitong
，xuanyongoukebianpinqi，baoliuyuanlaidianji，bianpinyunxingshi，jiangqizhuanzihuahuanduanjie，baoliuyuanlaizhulingkongzhiqi， 主令控製器上的行程開關，作為料車位置的到位、極限保護，使得上料卷揚機有足夠的運送能力
，既能滿足高爐生產的上料速度要求，又能保證高爐連續生產，實現上料自動化。

      gaoluliantieshengchanzhong，shangliaoxitongshishebeidezhongyaozuchengbufen，qikekaoxingzhijieyingxiangdaoshengchanxiaolvjijingjixiaoyi。oukebianpinqigenjuwaibukongzhixinhaodeyaoqiuheshijideyunxingsudu，kongzhishuchupinlvdedaxiao，shixianlegaolushangliaojuanyangjijiajiansuduandepingwenzhidonghewendingpaxing
，baozhengleliantieshengchandegaoxiaoyihegaowendingxing，youyicitixianleoukebianpinqidewanmeikongzhi。