Metso Minerals Industries, Inc.

Thomas G Braun

Mark K Torbett

Dean M Kaja

John Ponasik

A rock crusher includes a bowl coupled to a frame and a head assembly coupled to the frame defining a crushing gap between the head assembly and the bowl. The rock crusher further includes a number of fixed displacement hydraulic motors adapted to rotate the bowl with respect to the frame and a hydraulic fluid source providing a flow rate of hydraulic fluid to the hydraulic motors. A hydraulic control valve is adapted to remove one of the hydraulic motors from operation, directing the hydraulic fluid to the remaining hydraulic motors. The flow rate of hydraulic fluid remains unchanged, thereby increasing the hydraulic fluid flow rate provided to and the speed of the remaining hydraulic motors.

Cone crusher bowl adjustment mechanism

A rock crushing system or conical rock crusher includes a bowl which is threadably engaged to a main frame. The bowl can be adjusted with respect to the main frame at more than one speed by utilizing a gap adjustment mechanism including a variable displacement hydraulic motor. Preferably, a set of two variable displacement hydraulic motor units can be utilized to drive the bowl with respect to the frame at a lower torque, higher speed setting and at a higher torque, lower speed setting.

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Muskego, WI, United States of America

Thomas G Braun