| 摘要 |
FIELD: mining industry. ^ SUBSTANCE: device has frame, front and back supporting rollers, cutter with working elements in form of thin plates placed along spiral line, forming apparatus, drive. Edges of thin plate of working elements are made in form of parabolic curve. Plates of working elements are made even, slanted and, in turns, rotated in opposite directions. Back support roller is mounted on side holders of front portion of forming apparatus. ^ EFFECT: higher quality. ^ 8 dwg |
