シティークレーンのプレス曲げブームにおける高剛性軽量化技術

摘要

A wheel crane with a 70 tonne lifting capacity has been newly developed by KOBELCO CRANES CO., LTD. The crane's weight was reduced to less than 40 tonne by new designs for all components, particularly for the telescoping boom. As a result, the crane has satisfied Japanese regulations for being driven in the daytime, a first for 70 tonne class cranes. Compared with our existing cranes, the new crane has a greater lifting capacity, and its boom, when fully extended, is longer and, when fully retracted, shorter. Thus the new crane is not only compact and lightweight, but also scores high in capability and mobility.