BMG double girder semi-gantry , crane, commonly used for factories, warehouses within or close to the factory outside, the no leg side is under factoryrailway, the right side located on the ground railway, used for transporting general goods, rated lifting capacity is 5~40t, level is A5, A6, crane driven is three-in-one driven, variable frequency control, simple structure, easy maintenance. Control methord is ground control or cab control, driver's cab on the leg side.