... time 4.used on gantry crane,tower crane Function of electric motor cable reel : DJ1D type constant tension cable reel drum ... reel drum are usually used on gantry crane,tower crane,and bridge type lifter and the other mobile devices.Structure: ... the device and cable reel drum.For the small type cable reel drum(DJ1D-I,II,III,IV),workers ... cables, this reel has two kinds of spring type and electrical powered ...