... crane Function of electric motor cable reel : DJ1D type constant tension cable reel drum are mainly used on ... also can extending life of the cable. DJ1D type cable reel drum is very simple,stable and reliable ... are usually used on gantry crane,tower crane,and bridge type lifter and the other mobile devices.Structure:1, ... device and cable reel drum.For the small type cable reel drum(DJ1D-I,II,III,IV), ...