Longwall for underground mining operations comprises a hydraulic piston arranged between a horizontal runner and a roof member provided with a rock burst damping unit

摘要

Longwall for underground mining operations comprises a hydraulic piston (4) arranged between a horizontal runner (2) and a roof member (3) provided with a rock burst damping unit (14). Preferred Features: The roof member has a lower member (16) supported underneath by at least one hydraulic piston and hinged at one end (19) to the roof member and at the other end (21) to the roof member via the rock burst damping unit. The rock burst damping unit has at least one pressure spring (15) in the form of an annular spring.