一、概述自十九世纪四十年代第一台连续工作的跳汰机应用于选煤工业以来,国外机械选煤已有一百余年历史。本世纪五十年代后,随着煤质的日趋下降以及钢铁、动力和化工等部门的进一步发展,对煤炭的要求越来越高。因此,对选煤工业和设备提出了更高的要求,从而促进了选煤机械的发展。其主要发展趋向是: 一厂型和设备日趋大型化目前,美国“汉纳”煤矿公司的卓尔什达 I. Overview Since the first jig of continuous operation in the 1940s has been used in the coal preparation industry, foreign mechanical coal preparation has a history of over one hundred years. After the fifties of this century, with the declining coal quality and the further development of the steel, power and chemical industries, the demand for coal is getting higher and higher. Therefore, the coal preparation industry and equipment put forward higher requirements, thus promoting the development of coal preparation machinery. Its main development trend is: a plant type and equipment is becoming increasingly large At present, the United States “Hannah” coal company Zhuoer Shida