Heavy Duty QD double girder bridge travelling crane are mainly consists of Girder frame, Crane travelling device, trolley as the lifting device and electrical parts, it is divided into 2 working grade of A5 and A6 according to the use frequency. Bridge adopts box welded structure, high degree of vertical and horizontal rigidity; crane travelling mechanism adopts separate drive. It has a strong beam and a stable travelling mechanism; the emergency switch can stop any movement once any dangerous happened.
