Patent ID: 6609669
Filing Date: 2003-08-26
Classification: B02C

Abstract:
In combination with a ball and ring coal pulverizer having a housing, a stationary top grinding ring, a plurality of grinding balls and a rotating lower grinding ring, a hydraulic loading system for applying a uniform compressive force exerted on the top grinding ring and grinding balls against the lower grinding ring, the hydraulic loading system comprising:a plurality of hydraulic cylinder and piston assemblies mounted on the upper portion of the housing; a corresponding plurality of non-threaded rods, each rod connected to one of the pistons of the plurality of hydraulic cylinder and piston assemblies and passing through the upper portion of the housing; a corresponding plurality of compression springs, each compression spring connected, within the housing, between a corresponding non-threaded rod and the stationary top grinding ring; and control means connected to each of the plurality of hydraulic cylinder and piston assemblies for simultaneously generating the same pressure in each hydraulic cylinder and piston assembly for exerting the uniform compressive force on the top grinding ring.