Key technology and equipment of crushing of large lump coal in 8 m large mining height fully- mechanized face

In order to solve for blockage because of large lump sloughing coal on scraper conveyor head and stage loader entrance in high cutting height mining fa ce, the paper put forward comprehensive matching technology for crushing of large lump coal. With the research object of No.108 face in Jinjitan Mine, it not only analy zed the reasons for the coal flow congestion caused by sloughing coal, but also found out the most easily blocking coal position. Two schemes of inside baffle type and outside baffle type was designed to adapt to different working conditions of the equipment matching. The crushing device was researched and developed to a combinati on which includes motor, NGW reducer and picks, and could be driven by means of hydraulic pressure. As means of mechanical, electrical, hydraulic overload protectio n, the device had high security. The paper had an analysis on the picks arrangement, and expounded calculation method of picks line distance wich could reduce the cu tting energy consumption. The field application showed that having an experience of periodic pressure and cutting height variation, sloughing coal with different block si zes could be broken into small pieces of coal. After being crushded, the small coal could be unloaded very well. The crushing process was continuous and reliable, and manual intervention was not needed.