Underwater pelletizer with positively controlled cutter HUB

摘要

A cutter hub and blade assembly is supported and driven for rotational and axial movement in relation to the die face of a die plate in an underwater pelletizer. The supporting and driving arrangement includes a positive control of axial movement of the cutter hub and blades in relation to the die face as the cutter hub and blades are moved toward and away from the die face to obtain and maintain optimal axial position for the pelletizing operation and to minimize wear on the mechanical components involved. Positive control of the axial movement of the cutter hub and blades is obtained by a hydraulic/pneumatic actuation system controlling an elongated motion rod extending through a driven hollow motor shaft with one end of the motion rod connected with a hydraulic/pneumatic control and the other end being connected to a cutter hub holder that supports the cutter hub and blades to move the cutter hub and blades toward or away from the die face.