DZI、SZ1、DZ12型電動單軌抓斗起重機，作為一種架空起重運輸裝置，可以不占地面生產場地，僅靠架空軌道運行的懸掛式小車來實現工段、車間或工廠之間的無轉載運輸。在很多場合，如抓斗容量不大、地面生產場地有限、設置地面通道有困難等，采用此起重機常常較采用其它型式的抓斗起重機更為經濟合理。
The electric single-rail grab bucket lifting machine of model DZ12,DZ1 and SZ1 are the overhead lifting crane for transportation. it does not seize the floor area of prodrction site, but the Non-rotation transportation between the working section, mach8inning shop and works. can be caried out by the suspension cart running on the track over head only.