門式起重機的主要特點是：其行駛駕駛室與起重操縱室合二為一、是由履帶起重機（履帶吊）演變而成，將行走機構的履帶和行走支架部分變成有輪胎的底盤，克服了履帶起重機（履帶吊）履帶板對路麵造成破壞的缺點
，屬於物料搬運機械。

橋式起重機是橫架於車間、cangkuheliaochangshangkongjinxingwuliaodiaoyundeqizhongshebei。youyutadeliangduanzuoluozaigaodadeshuinizhuhuozhejinshuzhijiashang，xingzhuangsiqiao。qiaoshiqizhongjideqiaojiayanpushezailiangcegaojiashangdeguidaozongxiangyunxing，keyichongfenliyongqiaojiaxiamiandekongjiandiaoyunwuliao，bushoudimianshebeidezuai。tashishiyongfanwei**廣、數量**多的一種起重機械。

起重設備有的工作特點是做間歇性運動，即在一個工作循環中取料、運移、xiezaidengdongzuodexiangyingjigoushijiaotigongzuode
，qizhongjizaishichangshangdefazhanheshiyongyuelaiyueguangfan。youyubuyongzhituidiaozhongjidiaozhongxingshijingchangchuxianyixieshigu，xingshidesuduyejiaolvdaiqizhongji（履帶吊）快；作業穩定
、起重量大、可在特定範圍內吊重行走、但必須保證道路平整堅實
、輪胎氣壓符合要求
、吊離地麵不得超過50CM
；jinzhidaifuhechangjulixingzou。weibaozhengzuoyeanquan

，muqianguoneijibenshangjinzhibudazhituijinxingdiaozhuangzuoye。qizhongjipeitaoshiyonggangsishengpinzhongbaokuolinhuatucenggangsisheng、鍍鋅鋼絲繩和光麵鋼絲繩。