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　　門(men)式(shi)起(qi)(qi)(qi)(qi)重(zhong)(zhong)機(ji)(ji)(ji)是(shi)(shi)橋式(shi)起(qi)(qi)(qi)(qi)重(zhong)(zhong)機(ji)(ji)(ji)的(de)(de)(de)一種變形，又(you)叫(jiao)龍門(men)吊(diao)。主要(yao)用(yong)(yong)于(yu)室外的(de)(de)(de)貨場(chang)、料場(chang)貨、散(san)貨的(de)(de)(de)裝卸作(zuo)(zuo)(zuo)業。門(men)式(shi)起(qi)(qi)(qi)(qi)重(zhong)(zhong)機(ji)(ji)(ji)具(ju)有場(chang)地利用(yong)(yong)率高、作(zuo)(zuo)(zuo)業范圍大(da)、適應面(mian)(mian)廣(guang)、通用(yong)(yong)性強等特點，在港口貨場(chang)得到廣(guang)泛使用(yong)(yong)。　　它的(de)(de)(de)金屬結構像門(men)形框(kuang)架，承(cheng)載主梁(liang)下安裝兩條(tiao)支腳(jiao)，可以直(zhi)接在地面(mian)(mian)的(de)(de)(de)軌道上行(xing)走，主梁(liang)兩端可以具(ju)有外伸(shen)懸臂梁(liang)。　　工(gong)作(zuo)(zuo)(zuo)級別　　龍門(men)吊(diao)也就是(shi)(shi)門(men)式(shi)起(qi)(qi)(qi)(qi)重(zhong)(zhong)機(ji)(ji)(ji)工(gong)作(zuo)(zuo)(zuo)級別A：它反映(ying)了起(qi)(qi)(qi)(qi)重(zhong)(zhong)機(ji)(ji)(ji)在載荷(he)狀態(tai)(tai)和利用(yong)(yong)繁忙程度兩個(ge)方面(mian)(mian)的(de)(de)(de)工(gong)作(zuo)(zuo)(zuo)特性。　　工(gong)作(zuo)(zuo)(zuo)級別的(de)(de)(de)劃分是(shi)(shi)由起(qi)(qi)(qi)(qi)重(zhong)(zhong)機(ji)(ji)(ji)的(de)(de)(de)利用(yong)(yong)等級U和載荷(he)狀態(tai)(tai)Q決(jue)定(ding)的(de)(de)(de)。它們分為A1～A8八(ba)個(ge)級別。起(qi)(qi)(qi)(qi)重(zhong)(zhong)機(ji)(ji)(ji)工(gong)作(zuo)(zuo)(zuo)級別，　　也就是(shi)(shi)金屬結構的(de)(de)(de)工(gong)作(zuo)(zuo)(zuo)級別，按起(qi)(qi)(qi)(qi)升(sheng)機(ji)(ji)(ji)構確定(ding)，分為A1－A8級，若與中國規定(ding)的(de)(de)(de)起(qi)(qi)(qi)(qi)重(zhong)(zhong)機(ji)(ji)(ji)工(gong)作(zuo)(zuo)(zuo)類型對照，　　大(da)體(ti)上相當于(yu)：A1－A4－輕；A5－A6－中；A7－重(zhong)(zhong)，A8－特重(zhong)(zhong)。

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