Research on fully-mechanized coal mining technology and equipment in thin and medium extremely inclined coal seam

In order to achieve fully-mechanized mining in thin and medium extreme inclined seam, a new mining technology and equipment system was established for steep coal seam of 60° ~ 90° dip angle. Mining face was laid along the strike and advance down the slope, the layout of equipment and technological process were C ompleted on the horizontal axis. The Joint-shaped hydraulic support was the main carrier for impact shear and hanging chain scraper conveyor assembly on it. Support self-dropping relied on wedge-shaped seat, support drop generated the condition of carrying broken coal for scraper conveyor at the same time, the coal broken proces s was prepared for next operation cycle, so formed the cyclic process of broken coal, support drop and coal carrying. The supporting role of support took place with who le technological process. The results indicated that the process avoided the non-slip and anti-fall measures for equipment, the greater dip angle, the more suitable for t he process. The cooperation of processes was reliable, and the running of equipment was safe and efficient, the daily output of test working face reached to 1 944 t/d a nd its extraction rate reached to 95%, it was up to the technology standard of fully-mechanized coal mining.