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　　門(men)(men)(men)式起(qi)重(zhong)(zhong)(zhong)機是(shi)橋式起(qi)重(zhong)(zhong)(zhong)機的一(yi)種變形，又(you)叫龍門(men)(men)(men)吊。主(zhu)要用(yong)于室外的貨(huo)(huo)場、料(liao)場貨(huo)(huo)、散貨(huo)(huo)的裝卸作(zuo)(zuo)(zuo)業。門(men)(men)(men)式起(qi)重(zhong)(zhong)(zhong)機具有場地利(li)用(yong)率(lv)高(gao)、作(zuo)(zuo)(zuo)業范圍(wei)大、適(shi)應面(mian)廣(guang)、通用(yong)性強等特(te)點，在港口(kou)貨(huo)(huo)場得到廣(guang)泛(fan)使用(yong)。　　它(ta)的金(jin)屬(shu)(shu)結構(gou)像(xiang)門(men)(men)(men)形框架，承載(zai)主(zhu)梁下安裝兩條支(zhi)腳，可(ke)以(yi)直(zhi)接(jie)在地面(mian)的軌道上行走，主(zhu)梁兩端可(ke)以(yi)具有外伸懸(xuan)臂梁。　　工(gong)作(zuo)(zuo)(zuo)級(ji)(ji)別　　龍門(men)(men)(men)吊也(ye)(ye)就是(shi)門(men)(men)(men)式起(qi)重(zhong)(zhong)(zhong)機工(gong)作(zuo)(zuo)(zuo)級(ji)(ji)別A：它(ta)反映了(le)起(qi)重(zhong)(zhong)(zhong)機在載(zai)荷狀態和(he)利(li)用(yong)繁忙程(cheng)度兩個方面(mian)的工(gong)作(zuo)(zuo)(zuo)特(te)性。　　工(gong)作(zuo)(zuo)(zuo)級(ji)(ji)別的劃分是(shi)由(you)起(qi)重(zhong)(zhong)(zhong)機的利(li)用(yong)等級(ji)(ji)U和(he)載(zai)荷狀態Q決定的。它(ta)們分為A1～A8八個級(ji)(ji)別。起(qi)重(zhong)(zhong)(zhong)機工(gong)作(zuo)(zuo)(zuo)級(ji)(ji)別，　　也(ye)(ye)就是(shi)金(jin)屬(shu)(shu)結構(gou)的工(gong)作(zuo)(zuo)(zuo)級(ji)(ji)別，按起(qi)升(sheng)機構(gou)確定，分為A1－A8級(ji)(ji)，若與中(zhong)國規定的起(qi)重(zhong)(zhong)(zhong)機工(gong)作(zuo)(zuo)(zuo)類型對照，　　大體(ti)上相當于：A1－A4－輕(qing)；A5－A6－中(zhong)；A7－重(zhong)(zhong)(zhong)，A8－特(te)重(zhong)(zhong)(zhong)。

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