METHOD FOR EXTRACTION OF THICK GENTLY DIPPING COAL SEAMS

摘要

Use: to increase the safety of mining operations by eliminating the exposed surface of the roof at the breast stope. SUMMARY OF THE INVENTION: first derivative T breaking of the coal in the roof coal seam folding retractable visor to a depth equal widths shearer loader, and then embedded by sliding visor into the coal array and retractable visors protected derivative t a recess rest of the coal seam.