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US 5,524,840 AGranted
Milling device
OwnerMartin H. Gygiinventor
Life of this patent
Estimating the term…
Abstract
The milling device comprises a milling roller running in a milling ring, wherein the diameter of the milling roller is at least equal to the inner radius of the milling ring. The milling roller is driven by a tangential force. By this arrangement it is guaranteed that the center of mass of the roller runs about the mill's central axis at a constant frequency that does not depend on the wear of the roller or the ring. Furthermore, the axis of rotation of the roller is not tilted during operation such that no torque is generated.
Claims20
A device for milling comprising:
- a static frame,
- a milling ring laterally displaceable suspended in said frame, said milling ring having a cylindrical inner ring surface and defining a vertical central axis,
- a milling roller mounted to said ring, having a diameter substantially equal to or larger than an inner radius of said milling ring and rolling along said inner ring surface for crushing material falling vertically through a gap between said milling roller and said milling ring, said milling roller having a vertical central roller axis parallel to said central ring axis during milling and being freely rotatable about said roller axis,
- a drive for exerting a driving force to said milling roller, said driving force being tangential in respect to said ring surface, and
- mounting means for mounting said roller to said ring so that said roller and said ring form a commonly mounted unit that can be deflected laterally during milling with said unit having a center of mass that is substantially stationary during operation, said mounting means including roller suspension means suspended from said ring for preventing said roller from tilting from a vertical axis during milling while allowing a relative displacement of said roller in respect to said ring.
2 more elements
A device for milling comprising:
- a) a static frame;
- b) a milling ring having a cylindrical inner ring surface;
- c) ring suspension means for suspending said milling ring from the frame i) so that the milling ring defines a vertical central axis, ii) so as to permit lateral displacement of the ring in the frame and iii) so as to prevent a rotation between the milling ring and the frame without hindering said lateral displacement;
- d) a milling roller having a diameter substantially equal to or larger than an inner radius of said milling ring;
- e) mounting means for mounting said roller to said ring i) so that said roller has a vertical central axis and is freely rotatable therearound, ii) so that said roller and said ring form a commonly mounted unit that can be deflected laterally during milling with said unit having a center of mass that is substantially stationary during operation and iii) so that said inner ring surface and an outer edge of the roller define a gap through which material to be milled can fall, said mounting means including roller suspension means suspended from said ring for preventing said roller from tilting from a vertical axis during milling while allowing a relative displacement of said roller in respect to said ring;
- f) distribution means mounted to said milling ring and disposed above said milling roller for distributing the material to be milled so that it falls vertically through said gap;
- g) a drive for exerting a driving force to said milling roller;
- and
- h) coupling means for coupling the drive to the roller so that said driving force is substantially tangential to said ring surface whereby said milling roller has a vertical central roller axis parallel to said central ring axis during milling and rolls along said inner ring surface for crushing material falling vertically through the gap.
6 more elements
Dependencies are inferred from the claim text.