Center rotary machine is a large rock grab bucket capacity grasp rock machine, it is directly fixed to the sinking hanging plate to air pressure as the power center of the rotary catch rock machine manufacturer, the device has a wide range, adaptable, equipment utilization, dynamic single, compact structure, small area occupied by the central rotary catch wellbore rock Factory, easy wellbore arrangement, safe, reliable, flexible operation, easy maintenance, etc., is currently in the coal mine has been widely used. Central rotary catch rock machine components: the rack. Frame is welded box-shaped structure, the lower set cab. Four pillars of the cab to the cavity string Supply Center rotary catch rock machine also serves as the pressure gas line, a room equipped with control valve and pressure gauge for controlling the whole operation. Grab rock machine arrangement to coordinate with the bucket, does not appear to ensure that working surface grab rock dead.