Patent ID: 8360349
Filing Date: 2013-01-29
Classification: B02C

Abstract:
1. A control system for a grinder having a motor-driven rotor for grinding a material and a reversible hydraulic ram for feeding said material towards said rotor, comprising: a central computer having a processor, a memory associated therewith, and a plurality of inputs and outputs; a linear displacement transducer having an output representative of the position of said ram connected to an input of said central computer for detecting the position of said ram; a current transmitter having an output representative of the electrical current being supplied to the motor of said rotor connected to an input of said central computer; a pressure sensor having an output representative of the pressure being exerted by said ram on the material connected to an input of said control computer; a variable flow hydraulic pump for pressurizing hydraulic fluid; a plurality of solenoid valves for supplying hydraulic fluid to said ram thereby forcing said ram towards or away from said rotor, or stopping said ram, said plurality of solenoid valves connected to and energized by a plurality of outputs; and wherein said central computer controls both the direction and maximum velocity of said ram during its forward and reverse travel responsive to the electrical current being supplied to said rotor motor and the pressure being exerted by said ram.