Model the crane is in the introduction and digestion, on the basis of foreign advanced technology, guided by the theory of modular design, by means of modern computer technology, the introduction of optimization design and reliability design method, using imported configuration, new material, new process completed with a lightweight, generalization, energy conservation, environmental protection, free maintenance and high technical content of the new type of crane.This crane design, manufacturing and inspection are all implement the latest promulgated by the relevant state standards and the equivalent part using FEM, DIN, IEC and other foreign standards, compared with the original general QD type bridge crane products, reduce weight about 15 ~ 30%, the largest round reduce little about 10 ~ 35%, and can reduce the requirement of crane structure of workshop, workshop manufacturing cost saving.Transmission mechanism of the core components are all made of hard tooth surface, high precision gear speed reducer, and steel wheel drum, forging, and the application of variable frequency speed regulation system, makes the model crane traditional gm bridge crane upgrade products, suitable for machinery manufacture