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1970年初,伯利恒钢铁公司Burns Harbor新分厂已成为拥有近200台电动桥式起重机的钢铁联合企业。这些高生产率起重机的大车运行机构,采用了改进的双A 4型对角串接的驱动装置(图1)。大多都装有双轮缘圆柱踏面的
In early 1970, the new Burns Harbor branch of Bethlehem Steel became a steel conglomerate with nearly 200 electric overhead cranes. These high-productivity crane carts operate with an improved double A 4 diagonal tandem drive (Figure 1). Most are equipped with double-round edge of the cylindrical tread