This product adopts a four beam and four track double trolley structure, and the main structure has good strength and stiffness under vertical and horizontal loads. The wheels of the crane are arranged in a 20 wheel layout, with a simple mechanical model and balanced wheel pressure distribution, which can effectively reduce the cost of steel structures in the factory building. The whole machine adopts a speed control system, which runs smoothly and safely with small impact during starting and braking. At the same time, the lifting speed control device adopts a one in use and one backup system. When a set of devices fails, it can achieve safe and fast switching, ensuring the normal operation of the lifting system. The wheel group adopts a new series of standard 45 ° split forged wheels, which have the characteristics of high load-bearing capacity, dust prevention, long service life, and easy replacement and maintenance.