slip ring built-in type coiler cable reel 1.Using ... control. JT2 has a very large wide use in city management,port,environmental protection,ship building and repair ... other advantages. JT2 cable reel drum components include :winding spring group,winding drum, slipring, brush rocker, engine base, ... is pulled out with mechanical force,and winding spring group will have elasticity for cable,then cables ...