Vertical grinding mill, screw shaft, and method of designing and/or manufacturing a screw shaft
AssigneeMetso Minerals Industries, Inc.
InventorPeter Henry Radziszewski
Life of this patent
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Abstract
A screw shaft for a vertically stirred grinding mill is arranged so as to be accommodated within a grinding chamber of the grinding mill while extending in a longitudinal direction. The screw shaft comprises a central shaft and at least one screw flight surrounding the central shaft, and the central shaft comprises an outer shaft wall defining a cavity within the interior of the central shaft, which cavity is closed at least at one longitudinal end of the central shaft.
Claims16
A screw shaft for a vertically stirred grinding mill, wherein the screw shaft is arranged so as to be accommodated within a grinding chamber of the grinding mill while extending in a longitudinal direction, the screw shaft comprising:
- a central shaft and at least one screw flight surrounding the central shaft;
- and
- the central shaft comprising an outer shaft wall defining a cavity within the interior of the central shaft, which cavity is closed at least at one longitudinal end of the central shaft.
A method of designing and/or manufacturing a screw shaft for a vertically stirred grinding mill, comprising the steps of:
- choosing a type of material to be ground by means of the grinding mill, and choosing the type of grinding media to be used;
- and
- designing and/or providing a screw shaft to be accommodated within a grinding chamber of the grinding mill, the screw shaft comprising a central shaft and at least one screw flight surrounding the central shaft,
- wherein the central shaft comprises an outer shaft wall defining a cavity within the interior of the central shaft, which cavity is closed at least at one longitudinal end of the central shaft.
Dependencies are inferred from the claim text.