Reels mounted on the cage which is divided into four equal portions around. Convenient lumped loading, right and stable fixed position, high rigidity and strength, good performance, low moment of inertia， and high running speed. It adopts 36 classes gear box, dual active tractor, the branching wheel is natural and avoiding tears and wears when stranding wire. Tension control adopts pneumatic constant tension to ensure the tension is stable from full bobbin to empty. With automatic stop device, break-wire stop control every bobbin.