With the increasing capacity of truck crane, the cross section of the lifting boom gets constantly optimized, from the original quadrangle to polygon and U-shaped. The U shaped section boom can maximally display the mechanical property of the material and it also greatly reduces the weight of the lifting boom, which improves the lifting capacity of the large-tonnage truck crane. At the same time, it solves the problem of unsteady at some parts of the machine, and greatly improves the stability and reliability.

At present, North Traffic has applied the U-shaped boom technology on products of 6 various tonnage series, mainly include QY20U, QY25U, QY25U5, QY35U5, QY50U, and QY70U. The products are all advanced in terms of the technical indexes in China, and they are recognized by customers at both home and abroad.

Through the research and development of truck crane with U-shaped boom, North traffic has established independent patent technology and unique technology, and produced truck cranes with special characteristics of North Traffic.