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1. (WO2018067444) BROYEUR À CYLINDRES PLANÉTAIRES POUR TRAITER UNE MATIÈRE PREMIÈRE À HUMIDITÉ ÉLEVÉE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

What is claimed is:

1. A planetary roller mill for processing a feed material, the roller mill comprising:

a vessel assembly mounted to a stationary frame and having an inside surface;

a material feed supply in communication with the vessel assembly;

a grinding assembly positioned in the vessel assembly below the material feed supply, the grinding assembly comprising:

an annular grinding ring having an opening extending therethrough, the opening being defined by a radially inward facing grinding surface and having a first area, the grinding ring being in sealing engagement with the inside surface of the vessel assembly;

a shaft rotatably mounted to the frame;

a first support plate secured to the shaft and having a first axially facing surface defining a second area;

a second support plate secured to the shaft and having a second axially facing surface defining a third area, the second support plate being spaced axially apart from the first support plate;

a plurality of rollers rotatably mounted to and positioned between the first support plate and the second support plate, each of the plurality of rollers being configured to move between the first support plate and the second support plate as a result of rotation of the shaft, each of the plurality of rollers having a radially outer surface that is in grinding communication with the grinding surface of the grinding ring;

an air supply system having an outlet in communication with the opening in the grinding ring for supplying air through the opening; and

wherein the first support plate and the second support plate are of a non-circular shape such that the second area of the first support plate and the third area of the second support plate are of magnitudes which configure a flow area through the opening of at least 30 percent of the first area to provide a predetermined quantity of heated air to remove moisture from the feed material in the grinding assembly.

2. The planetary roller mill of claim 1, wherein each of the plurality of rollers has a bore axially extending therethrough, the bore having an inside diameter, each of the plurality of rollers is mounted on a pin secured to and extending between the first plate and the second plate, the pin having an outside diameter that is less than the inside diameter of the bore.

3. The planetary roller mill of claim 1, wherein the flow area is from 40 to 70 percent of the first area so that the predetermined quantity of heated air is sufficient to at least one of dry and calcining synthetic gypsum, natural gypsum or mixtures of synthetic gypsum and natural gypsum.

4. The planetary roller mill of claim 1, wherein the flow area is from 40 to 70 percent of the first area so that the predetermined quantity of heated air is sufficient to at least one of dry and calcining synthetic gypsum having about 10 wt% surface moisture and about 20 wt% chemical bond moisture, natural gypsum having about 5% surface moisture and about 20 wt% chemical bond moisture or a mixture of synthetic gypsum and natural gypsum about 5 wt% to about 10 wt% surface moisture and about 20 wt% chemical bond moisture, while providing sufficient dwell time in the grinding area to produce a ground calcined product of a predetermined particle size.

5. The planetary roller mill of claim 1, wherein the predetermined quantity of heated air is sufficient to at least one of dry and calcining the fine feed material having a particle size of less than 1 millimeter.

6. The planetary roller mill of claim 1, wherein the flow area is from 30 to 60 percent of the first area so that the predetermined quantity of heated air is sufficient to remove moisture from the feed material comprising at least one of Kaolin clay, bentonite, limestone, pet coke and coal.

7. The planetary roller mill of claim 1, wherein the flow area is from 30 to 60 percent of the first area so that the predetermined quantity of heated air is sufficient to remove moisture from the feed material having a moisture content of greater than 5 wt%, while providing sufficient grinding area to produce a ground dried product of a predetermined particle size.

8. The planetary roller mill of claim 1, wherein the flow area is from 30 to 60 percent of the first area so that the predetermined quantity of heated air is sufficient to remove moisture from the feed material having a particle size of about 0.05 mm to about 50 mm.

9. The planetary roller mill of claim 1, wherein the radially outer surface of each of the rollers is convex and the grinding surface of the grinding ring is concave.

10. The planetary roller mill of claim 1, wherein the radially outer surface of each of the rollers is substantially straight and the grinding surface of the grinding ring is substantially straight.

11. The planetary roller mill of claim 1, wherein the each of the rollers has a conical outer surface and the grinding surface of the grinding ring is sloped to receive the conical rollers.

12. The planetary roller mill of claim 1, further comprising at least one wear member removably disposed between the roller and at least one of the first support plate and the second support plate.

13. The planetary roller mill of claim 1, wherein the outlet of the air supply system is connected to a bottom portion of the opening of the grinding ring, beneath the plurality of rollers.

14. The planetary roller mill of claim 1, wherein the grinding assembly comprises a plow assembly rotatable with the shaft and configured to transport the feed material from below the grinding assembly to the plurality of rollers and grinding ring.

15. The planetary roller mill of claim 1, wherein the plow assembly is secured to the second support plate.

16. The planetary roller mill of claim 1, further comprising:

at least one additional support plate secured to the shaft, the at least one additional support plate being spaced axially apart from the first support plate and the second support plate; and

an additional plurality of rollers mounted to and positioned between the at least one additional support plate and one of the first support plate and the second support plate, each of the additional plurality of rollers being configured to move between the first support plate, second support plate and the at least one additional support plate as a result of rotation of the shaft, each of the plurality of additional rollers having the radially outer surface that is in grinding communication with the grinding surface of the grinding rings.

17. The planetary roller mill of claim 1, wherein the grinding assembly is configured for grinding the feed material at grinding zone air temperature of at least 177 degrees Celsius (350 degrees Fahrenheit).

18. The planetary roller mill of claim 1, wherein the material feed supply comprises an outlet that extends through the vessel assembly into an interior area thereof and comprising a ramp secured to the inside surface and extending downwardly and radially inward relative to the outlet and at least partially between the outlet and the grinding ring.

19. The planetary roller mill of claim 18, further comprising a cover positioned over the outlet and at least a portion of the ramp.

20. The planetary roller mill of claim 18, further comprising a means for adjusting the vertical position of the rollers relative to the grinding ring.

21. The planetary roller mill of claim 1, wherein at least one of the first support plate and the second support plate have a central area and at least one lobe extending outwardly from the central area, the at least one lobe having an asymmetrical shape, the at least one lobe having an area for receiving a roller mounting pin, the area having a center point, the asymmetric shape comprising a trailing edge and a leading edge generally opposite the trailing edge, the trailing edge extends further away from the center point than does the leading edge.

22. The planetary roller mill of claim 21, wherein:

each of the plurality of rollers has at least one axial end; and

the center point is positioned on the at least one lobe such that during rotation of the first support plate and the second support plate in a direction from the trailing edge to the leading edge, the at least one lobe covers at least a portion of the at least one axial end adjacent to the leading edge and the trailing edge.

23. A grinding mill for processing feed material, the grinding mill comprising:

a vessel assembly mounted to a stationary frame and having an inside peripheral surface; a material feed supply in communication with an interior area of the vessel assembly via an outlet extending radially inward through the inside peripheral surface;

a grinding assembly positioned in the vessel assembly, the grinding assembly comprising: a grinding surface;

a plurality of grinding rollers rotatably mounted relative to the grinding surface, the plurality of rollers being configured to be in grinding communication with the grinding surface; and

a ramp secured to the inside surface and extending downwardly and radially inward relative to the feed outlet and at least partially between the feed outlet and the grinding ring and being disposed radially outwardly from the grinding rollers.

24. The grinding mill of claim 23, further comprising a cover positioned over the feed outlet and at least a portion of the ramp.

25. The grinding mill of claim 24,wherein the cover comprises at least one of a front sloped wall and at least one side wall.

26. The grinding mill of claim 24, wherein the cover is disposed radially outwardly from the grinding rollers.

27. The grinding mill of claim 23, wherein the grinding assembly comprises one of:

a planetary grinding roller and support plate assembly; and

a pendulum grinding roller and support structure assembly.

28. A method of retrofitting a roller mill, the method comprising:

providing a roller mill having a vessel assembly mounted to a stationary frame, a grinding assembly positioned in the vessel assembly, the grinding assembly comprising:

a first grinding ring having a first opening extending therethrough, the first opening being defined by a first radially inward facing grinding surface and having a first area, the first grinding ring being in sealing engagement with the inside surface of the vessel assembly;

a shaft rotatably mounted to the frame;

a hub mounted to one end of the shaft;

a plurality of arms extending from the hub;

a plurality of journal assemblies, one of the plurality of journal assemblies being pivotally secured to each of the plurality of arms;

a plurality of first rollers, one of the plurality of first rollers being rotatingly coupled to each journal assembly;

removing the plurality of arms, the plurality of journal assemblies and the plurality of first rollers from the roller mill;

providing a sleeve, a first support plate, a second support plate and a plurality of second rollers

positioning the sleeve over the shaft and securing the sleeve to the shaft via the hub; securing the first support plate to the sleeve, the first support plate having a first axially facing surface defining a second area;

securing the second support plate to the sleeve, the second support plate having a second axially facing surface defining a third area, the second support plate being spaced axially apart from the first support plate;

rotatably mounting the plurality of second rollers to and between the first support plate and the second support plate, each of the plurality of rollers being configured to move between the first support plate and the second support plate as a result of rotation of the shaft, each of the plurality of rollers having a radially outer surface; and

wherein the first support plate and the second support plate are of a non-circular shape such that the second area of the first support plate and the third area of the second support plate are of magnitudes which configure a flow area through the first opening of at least 30 percent of the first area to provide a predetermined quantity of heated air to remove moisture from the feed material in the grinding assembly

29. The method of claim 28, further comprising:

providing a first plow assembly secured to the hub;

removing the first plow assembly from the roller mill;

providing at least one second plow assembly and securing the at least one second plow assembly to the second support plate.

30. The method of claim 28, further comprising:

removing the first grinding ring from the roller mill;

providing a second grinding ring having the first opening defined by the first radially inward facing grinding surface and having the first area; and

installing the second grinding ring in sealing engagement with the inside surface of the vessel assembly.

31. The method of claim 30, further comprising:

adjusting the vertical position of the rollers relative to the grinding ring.

32. A support plate for a planetary roller mill, the support plate comprising:

a central area;

at least one lobe extending radially outward from the central area, each of the at least one lobes having an asymmetrical shape and an area for receiving a roller mounting pin, the area having a center point, the asymmetric shape comprising a trailing edge and a leading edge generally opposite the trailing edge, the trailing edge extends further away from the center point than does the leading edge.

33. The support plate of claim 32, wherein:

the center point is positioned on the at least one lobe such that during rotation of the support plate in a direction from the trailing edge to the leading edge, the at least one lobe is configured to cover at least a portion of an axial end of a roller, adjacent to the leading edge and the trailing edge.