自1949年匈牙利发明悬臂式部分断面掘进机以来,苏联、英国、西德、日本等国家先后发展了悬臂式径向切割式掘进机。30多年来,这种掘进机在主要技术性能、使用寿命及除尘、运支等方面都取得了很大进展。近年来,这种掘进机已能经济地切割单轴抗压强度为600一700公斤力/厘米2的细砂岩、石灰岩,对巷道中局部或夹层的 Since the invention of the cantilever section boring machine in Hungary in 1949, the cantilever radial cutting boring machine has been developed in the countries such as the Soviet Union, the United Kingdom, West Germany and Japan. For more than 30 years, this type of roadheader has made great strides in terms of its main technical performance, service life, dust removal and transportation support. In recent years, this roadheader has been able to economically cut fine sandstone and limestone with a uniaxial compressive strength of 600-700 kgf / cm 2,