A rotor assembly is provided for deployment within the inner gimbal assembly of a control moment gyroscope. Chunks of material to be crushed are fed by a conveyor 12 into the nip 14 between the rolls. The base has a resilient unit, a guiding unit, a revolving unit and a pressing unit, wherein the pressing unit has short slots and long slots with different depth to align with a spacing column of the positioning unit to control the pressing unit. Also, the cluster head equipment contains: an acquisition means that acquires one or both\u2014of information regarding the primary user and information regarding a primary signal\u2014and the like; and a transmission means that transmits information to the secondary user.