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掩护式支护结构的运用,是综采的一大进步。匈牙利的煤炭工业也开展了这方面的研制工作。继第一组掩护支架以后,新发展的各种掩护支架,今天已在全世界得到广泛应用。 世界各国越来越强烈地要求对煤层要更好地开采。他们把在中厚煤层中使用的
The use of shield type support structure is a big progress of fully mechanized mining. The coal industry in Hungary also carried out research and development in this area. Following the first group of shelving stents, various newly developed shelving stents are nowadays widely used around the world. All countries in the world are increasingly demanding that the coal seam be mined better. They are used in the thick seam