Alstom Technology Limited

David C Wasz

Walter A Nelson

An electronically controlled journal loading systemfor controlling and adjusting the amplitude of the load applied to a journal assemblyof a pulverizing millThe journal loading systemincludes a servomotorresolververtical gearboxcoil spring assemblycontrollerand a user interfaceThe journal loading systemprovides electronic control and adjustment of the force applied to the journal assemblyto thereby increase or decrease the load that a grinding rollimposes on the material being pulverized. In the mode of operation of the servo journal loading systema desired load set point is selected via the user/operator interfaceThe servomotorrotates a preload stud (or servo screw)within the coiled spring assemblyin the appropriate direction via the gearboxAs the preload studturns, a bronze nutand bushingmove axially along the stud to compress or decompress the springBased upon the linear movement of the preload studand the precalculated spring force of the springthe load applied to the journal assemblyis displayed on the operator interfaceOnce the journal loading level is achieved the servomotorcan be turned off since the spring assemblymaintains the selected loading to the journal assembly

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Clarendon Hills, IL, United States of America

David C Wasz