步行式拉铲是冶金矿山、露天煤矿剥离、挖掘的重要机械,30年代美国芝加哥Mohig-han公司首先设计制造了斗容量为3.5米~3拉铲,主要用于露天煤矿的剥离,也用于大型土方施工工程,40多年来,全世界总共发展了50～60种不同规格的拉铲产品,年产量大约有100多台,年产总斗容在1500米~3以上。步行式拉铲的传动方式、步行机构、工作装置、电控系统等各部分都得到了不断的改进和完善。目前,美国、英国、苏联等国处于领先地位,铲斗容量最小4米~2,最大168米~3。我国到目前为止,生产的最大产品是WB Walker dragline is a metallurgical mine, open-pit mine stripping, excavation of important machinery, the United States in the United States in the 1930s, Mohig-han Chicago company first designed bucket capacity of 3.5 m ~ 3 dragline, mainly for the demolition of open-pit mines, but also for Over 40 years, a total of 50 ~ 60 kinds of dragline products with different specifications have been developed in the world. The annual output is about 100 sets and the annual total capacity of the bucket is over 1500m ~ 3. Walking drag shovel transmission, walking agencies, work equipment, electronic control systems and other parts have been continuously improved and improved. At present, the United States, Britain, the Soviet Union and other countries in a leading position, the bucket capacity of the smallest 4 meters ~ 2, the largest 168 meters ~ 3. So far in our country, the largest product of production is WB