Development of intelligent sets equipment for fully -mechanized 7 m height mining face

In order to realize the safety and efficient automatic mining to 7 m coal seam in Shanxi, Shaanxi and Inner Mongolia Area,a set of intelligent fully- mechanize d mining equipment for 7 m height coal seam was developed. Surrounding rock control,transition from workface to roadway,equipment coordination control and transportati on system reliability were significant stumbling blocks caused by mining height going up. To solve these problems ,new technologies were investigated that intelligent coupli ng control,high gradient transition,workface straightening,control of coal flow and work ability of scraper convey. The 7 m hydraulic support was designed and underwent 80 000 times loading circle. The ability of scraper convey was up to 4 500 t/ h. Workface intelligent control system can accurately coordinate the machines working along 350 m workface. Through industrial test in Hongliulin Mine,mining personnel in workface reduced from 14 to 5,and output per month was up to 1. 11 million tons and 12 million t ons coal could be produced annually.