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US 4,256,453 AGranted
Calciner screw construction
AssigneeSelas Corporation of America
InventorMichael A. Csapo
Life of this patent
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AssigneeSelas Corporation of America
InventorMichael A. Csapo
Estimating the term…
In a calciner of the type having a screw conveyor for advancing material to and through a calcining reaction zone, and wherein the screw conveyor comprises an internally cooled support shaft which is provided within an outer screw flight shaft, an improvement comprising means for controlling the bending stress between the inner and outer shafts is provided. Further, means are also provided for allowing axial movement of one of the shafts relative to the other. The bending stress ranges between the inner and outer shafts are controlled by means of a plurality of bearing members which extend in a generally radial direction with respect to the shafts and which extend between the shafts. The bending stress range is also controlled by the axial position of the bearing members along the shafts. Axial movement of one shaft relative to the other is permitted by the provision of bearing cages around the inner shaft with axial slots formed in the cage. A portion of the bearing member is tracked in the slot and can thus slide axially therein.
In a calciner of the type wherein a screw type conveyor is provided to advance the work to and through a calcining chamber, and wherein said screw conveyor comprises an outer flight shaft and an internally cooled support shaft which is mounted within said outer flight shaft, the improvement comprising a plurality of bearing means mounted for distributing a bending stress forming on said inner and outer shafts, and means for allowing axial movement of one of said shafts in relation to said other shaft to compensate for linear expansion or contraction of one of said shafts relative to the other.
In a calciner of the type wherein a screw type conveyor is provided to advance material to and through a calcining chamber, said calciner including a screw conveyor comprising an outer screw flight shaft and an inner, internally cooled support shaft mounted within said outer shaft, the improvement comprising a plurality of bearing members extending between the respective outer and inner shafts, and outboard bearing means mounted at the ends of said support shaft, said bearing members maintaining the spacing between said inner and outer shafts and cooperating with said outboard bearing means for minimizing bending stresses which result from temperatures differentials between the respective shafts and along their lengths.
Dependencies are inferred from the claim text.