近十几年来,随着世界各国对各种矿产的开发和科学技术的发展,矿山生产机械化与自动化程度的进展十分迅速。如美国、加拿大、苏联、西德、瑞典、日本、英国、法国等发展都比较快。美国在发展大型高效能的采掘、运输设备方面居于世界首位。它制造的矿山机械销售于加拿大、澳大利亚、英国、美洲、欧洲、亚非等138个国家。西德在露天大型采煤机械 In the past decade or so, with the development of various minerals and the development of science and technology in various countries in the world, progress has been made in mechanization and automation of mine production. Such as the United States, Canada, the Soviet Union, West Germany, Sweden, Japan, Britain, France and other developments are relatively fast. The United States ranks first in the world in developing large-scale high-performance mining and transportation equipment. It manufactures mining machinery for sale in 138 countries including Canada, Australia, the United Kingdom, the Americas, Europe, Asia and Africa. West Germany in the open-cast mining machinery