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menshiqizhongjidejinshujiegouxiangmenxingkuangjia，chengzaizhuliangxiaanzhuangliangtiaozhijiao，keyizhijiezaidimiandeguidaoshangxingzou。zhuliangliangduankeyijuyouwaishenxuanbiliang，zhezhongshejikuodaleqizhongjidezuoyefanwei。genjujiegoutedian，menshiqizhongjikefenweiquanmenshiqizhongji、半門式起重機、雙懸臂門式起重機和單懸臂門式起重機等多種類型。
門式起重機在結構上主要由龍門架、大車運行機構、升sheng降jiang小xiao車che和he電dian氣qi部bu分fen組zu成cheng。其qi中zhong，龍long門men架jia是shi起qi重zhong機ji的de主zhu體ti結jie構gou，支zhi撐cheng起qi整zheng個ge起qi重zhong機ji並bing承cheng受shou各ge種zhong載zai荷he。大da車che運yun行xing機ji構gou負fu責ze起qi重zhong機ji的de移yi動dong，而er升sheng降jiang小xiao車che則ze負fu責ze貨huo物wu的de升sheng降jiang和he搬ban運yun。電dian氣qi部bu分fen則ze提ti供gong動dong力li和he控kong製zhi功gong能neng，確que保bao起qi重zhong機ji的de正zheng常chang運yun行xing。
門式起重機在港口、碼頭、冶金、電力、化工等工業場所都有廣泛應用。根據起重機的外形尺寸與工作性能，它通常分為輕小型起重機、普(pu)通(tong)型(xing)橋(qiao)式(shi)起(qi)重(zhong)機(ji)及(ji)大(da)噸(dun)位(wei)特(te)種(zhong)專(zhuan)用(yong)起(qi)重(zhong)機(ji)和(he)造(zao)船(chuan)用(yong)門(men)座(zuo)起(qi)重(zhong)機(ji)等(deng)類(lei)型(xing)。輕(qing)量(liang)型(xing)橋(qiao)式(shi)起(qi)重(zhong)機(ji)的(de)起(qi)重(zhong)量(liang)和(he)跨(kua)度(du)較(jiao)小(xiao)，多(duo)用(yong)於(yu)室(shi)內(nei)外(wai)作(zuo)業(ye)場(chang)所(suo)的(de)物(wu)料(liao)搬(ban)運(yun)作(zuo)業(ye)或(huo)設(she)備(bei)維(wei)修(xiu)保(bao)養(yang)等(deng)工(gong)作(zuo)。