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　　門(men)(men)式(shi)(shi)起(qi)重(zhong)(zhong)(zhong)(zhong)(zhong)機(ji)(ji)是(shi)橋式(shi)(shi)起(qi)重(zhong)(zhong)(zhong)(zhong)(zhong)機(ji)(ji)的(de)(de)一種變形(xing)，又(you)叫龍門(men)(men)吊(diao)。主要用(yong)于(yu)室外的(de)(de)貨場(chang)(chang)、料場(chang)(chang)貨、散貨的(de)(de)裝卸(xie)作(zuo)(zuo)業。門(men)(men)式(shi)(shi)起(qi)重(zhong)(zhong)(zhong)(zhong)(zhong)機(ji)(ji)具有場(chang)(chang)地利(li)用(yong)率高、作(zuo)(zuo)業范圍大、適(shi)應面廣(guang)、通用(yong)性強等(deng)(deng)特點，在港口貨場(chang)(chang)得(de)到廣(guang)泛使用(yong)。　　它的(de)(de)金(jin)屬結(jie)構像(xiang)門(men)(men)形(xing)框架，承載(zai)主梁下安裝兩條支腳，可(ke)以直(zhi)接(jie)在地面的(de)(de)軌(gui)道上(shang)行走，主梁兩端可(ke)以具有外伸懸(xuan)臂梁。　　工作(zuo)(zuo)級(ji)別(bie)　　龍門(men)(men)吊(diao)也就(jiu)是(shi)門(men)(men)式(shi)(shi)起(qi)重(zhong)(zhong)(zhong)(zhong)(zhong)機(ji)(ji)工作(zuo)(zuo)級(ji)別(bie)A：它反映(ying)了起(qi)重(zhong)(zhong)(zhong)(zhong)(zhong)機(ji)(ji)在載(zai)荷(he)狀(zhuang)態(tai)和利(li)用(yong)繁忙程度兩個方面的(de)(de)工作(zuo)(zuo)特性。　　工作(zuo)(zuo)級(ji)別(bie)的(de)(de)劃分是(shi)由起(qi)重(zhong)(zhong)(zhong)(zhong)(zhong)機(ji)(ji)的(de)(de)利(li)用(yong)等(deng)(deng)級(ji)U和載(zai)荷(he)狀(zhuang)態(tai)Q決定(ding)的(de)(de)。它們分為A1～A8八個級(ji)別(bie)。起(qi)重(zhong)(zhong)(zhong)(zhong)(zhong)機(ji)(ji)工作(zuo)(zuo)級(ji)別(bie)，　　也就(jiu)是(shi)金(jin)屬結(jie)構的(de)(de)工作(zuo)(zuo)級(ji)別(bie)，按(an)起(qi)升(sheng)機(ji)(ji)構確定(ding)，分為A1－A8級(ji)，若與中國規定(ding)的(de)(de)起(qi)重(zhong)(zhong)(zhong)(zhong)(zhong)機(ji)(ji)工作(zuo)(zuo)類型對照(zhao)，　　大體上(shang)相當于(yu)：A1－A4－輕；A5－A6－中；A7－重(zhong)(zhong)(zhong)(zhong)(zhong)，A8－特重(zhong)(zhong)(zhong)(zhong)(zhong)。

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