| 摘要 |
FIELD: mining industry. ^ SUBSTANCE: device has flexible ceiling, sections, having face and goaf portions and including base, supporting and limiting ceilings, hydraulic posts, moving hydraulic jack, side shields for supporting and limiting ceilings, extended by hydraulic jacks, and is provided with flexible ceiling. Its sections are connected in couples by hydraulic cylinders, jointly mounted on bases of these sections respectively on face and goaf portions thereof with possible force interaction for changing distance between sections during change of face length, appropriate for massiveness of ore body. ^ EFFECT: higher reliability. ^ 5 dwg |
