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US 5,630,557 AGranted
Stirring bead mill with separator to strain out grinding beads
AssigneeOmya AG
InventorUlrich Barthelmess
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AssigneeOmya AG
InventorUlrich Barthelmess
Estimating the term…
The invention relates to a stirring mill in whose grinding tank, provided with an inlet and an outlet, and charged with a load of grinding beads, a stirring shaft (stirring mechanism) provided with stirrers, is rotatable, on which, for holding back the grinding beads a separator is mounted ahead of the outlet and is provided with radial openings. The invention is addressed to the problem of creating a stirring mill with a grinding bead separator whose separation limit corresponds to the upper grain size of the fines, by which sieves or filters for holding back the grinding beads are avoided, and which nevertheless sufficiently assures that no grinding beads or particles of dispersants can enter into the finish-ground product. This problem is solved by the fact that the separator is formed by a rotor in the manner of a centrifugal force sifting rotor (6) wherein the passages are formed by the interstices or spaces between every two sifter rotor paddles (10).
A stirring mill having a grinding tank for holding a charge of grinding beads, an inlet, an outlet, a stirring shaft provided with rotatable stirring means, and a separator mounted on the stirring shaft for holding back the grinding beads ahead of the outlet, an outer annular chamber formed between an outer circumference of the separator and an inner circumference of the grinding tank, and an inner outlet chamber annularly surrounding the stirring shaft and extending to the outer circumference of the separator, the separator being formed as a centrifugal force sifting rotor, comprising a plurality of circumferentially arranged, axially oriented, spaced-apart paddles, having a plurality of first openings therebetween, the first openings communicating the outer annular chamber with the inner outlet chamber, the separator further comprising at least one radial second opening communicating the inner outlet chamber with the outlet, and a seal means for selectively preventing direct passage of particles over a certain chosen size between the outer annular chamber and the outlet.
A stirring mill having a grinding tank for holding a charge of grinding beads, the tank having an inlet and an outlet and a stirring shaft provided with rotatable stirring means, wherein a device for holding back the grinding beads is provided at the outlet side of the grinding tank, wherein at least one separately driven sifter rotor is provided in an upper part of expanded diameter of the grinding tank.
Dependencies are inferred from the claim text.