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US 4,717,082 AGranted
Fixed roller pulverizing mill
AssigneeFoster Wheeler Energy Corporation
InventorsPaul V. Guido, Chester J. Romanowski, William D. Stevens
Life of this patent
Estimating the term…
Abstract
A fixed roller pulverizing mill wherein there is comparatively little wear, vibration or other adverse characteristics and wherein a uniform fineness of the ground material is maintained. The rollers, which do not move substantially in a horizontal direction, bear down on a rotating table, contacting the table at a circular trough therein and are individual spring biased to improve the performance of the mill.
Claims6
A coal pulverizing mill comprising:
- an outer shell;
- a horizontal table rotatably mounted within said shell, having an annular recess in the upper surface thereof, said recess being concave over the width thereof;
- means to rotate said table;
- means to place coal on said table;
- a plurality of rollers above said table having a tread portion convex over the width thereof bearing on said table within said recess;
- a plurality of supports, each of said rollers being rotatably mounted on one of said supports, each of said supports being pivotally mounted on said outer shell for upward and downward movement;
- a plurality of spring means, each of said spring means being connected with said shell to exert a spring force only on one of the supports to urge the one of said rollers associated with said one support down against said table, each of said spring means comprising two springs, said two springs being spaced apart along the direction perpendicular to the axis of the associated roller, engaging their associated support on opposite sides of a vertical plane extending through the axis of rotation of the associated roller, and exerting a force on their associated support in a direction parallel to said axis of rotation;
- whereby, when one of said rollers moves vertically, said movement has no effect on the others of said plurality of rollers and all of the rollers are biased to roll straight in the annular recess in the horizontal table.
5 more elements
A pulverizing mill comprising:
- an outer shell;
- a table rotatably mounted within said outer shell, said table having an annular track including an annular recess;
- means for rotating said table;
- means for placing material to be pulverized on said table;
- a plurality of rollers, each having a tread portion bearing on said table within said recess;
- a plurality of supports, each having one of said rollers rotatably mounted thereon, each said support being pivotally secured to said outer shell for upward and downward movement;
- and
- a plurality of spring means, each spring means engaging one of the supports, but supported independently of said supports, to urge the associated roller toward said table, each of said spring means comprising two spring assemblies, said two spring assemblies being spaced apart along the direction perpendicular to the axis of the associated roller, engaging their associated support on opposite sides of a vertical plane extending through the axis of rotation of the associated roller, and exerting a force on their associated support in a direction parallel to said axis of rotation.
5 more elements
Dependencies are inferred from the claim text.