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US 5,887,808 AGranted
High efficiency grinding apparatus
AssigneeScott Equipment Company
InventorRichard V. Lucas
Life of this patent
Estimating the term…
Abstract
A grinding apparatus optimizes grinding efficiency within the grinding chamber by providing grinding action over a 360.degree. range encompassed by a set of breaker bars and one or more arcuate screening elements. Arcuate screening elements have an inside radius that identically matches the inside radius of the breaker bars. The screening elements act as grinding mechanisms as well as more conventional filtering mechanisms due to increased grinding capacity when the inside radial surface of the screening elements and the inside radial surface defined by the breaker bars are equidistant from the axis of a rotational shaft that supports a plurality of circumferentially spaced hammers.
Claims33
A grinding apparatus comprising:
- a substantially cylindrical product grinding chamber having a rotatable hammer assembly axially disposed there through, said rotatable hammer assembly having a plurality of circumferentially spaced hammers defining a rotation path therein;
- at least one inlet port through which at least one product can be introduced into said substantially cylindrical grinding chamber;
- at least one discharge port through which any comminuted product can be discharged from said substantially cylindrical grinding chamber;
- a plurality of breaker bars attached to selected portions of the periphery of said substantially cylindrical grinding chamber, each breaker bar within said plurality of breaker bars being substantially perpendicular to a tangent of said rotation path of said hammers defined at each said breaker bar;
- wherein said substantially cylindrical grinding chamber comprises a plurality of arcuate back bars, each arcuate back bar within said plurality of arcuate back bars being substantially parallel to a tangent of said rotation path of said hammers defined at each back bar;
- and
- at least one arcuate screening element attached to said plurality of back bars such that a first inside radius prescribed by said at least one arcuate screening element and a second inside radius prescribed by said plurality of breaker bars are equidistant from a common central axis defined by said rotatable hammer assembly and said substantially cylindrical grinding chamber.
4 more elements
A grinding apparatus comprising:
- a substantially cylindrical housing defining a product grinding chamber therein;
- a rotatable hammer assembly axially disposed through said product grinding chamber, said rotatable hammer assembly having a plurality of circumferentially spaced hammers defining a rotation path therein;
- at least one feeder port through which at least one product can be introduced into said product grinding chamber;
- at least one discharge port through which any comminuted product can be discharged from said product grinding chamber;
- a plurality of breaker bars attached to first selected inner surface portions of said substantially cylindrical housing, each breaker bar within said plurality of breaker bars being substantially perpendicular to a tangent of said rotation path of said hammers defined at each said breaker bar;
- a plurality of back bars attached to second selected inner surface portions of said substantially cylindrical housing;
- and
- at least one arcuate screening element attached to said plurality of back bars such that a first inside radius defined by said at least one arcuate screening element and a second inside radius defined by said plurality of breaker bars are equidistant from a common central axis defined by said substantially cylindrical housing and said rotatable hammer assembly.
5 more elements
A grinding apparatus comprising:
- a substantially cylindrical grinding chamber defined by a solid arcuate wall portion and a perforated arcuate wall portion;
- a plurality of rib members;
- at least one arcuate screen element coupled to said plurality of rib members to form said perforated arcuate wall portion such that said perforated arcuate wall portion has an inner radius prescribed by said at least one arcuate screen element;
- wherein said solid arcuate wall portion is adapted to mate with said perforated arcuate wall portion to form a substantially cylindrical housing defining said substantially cylindrical grinding chamber therein;
- a rotatable hammer assembly axially disposed through said grinding chamber, said rotatable hammer assembly having a plurality of circumferentially spaced hammers defining a rotation path therein;
- a means for introducing at least one product into said substantially cylindrical grinding chamber;
- a means for discharging comminuted product from said substantially cylindrical grinding chamber;
- and
- a plurality of breaker bars attached to selected portions of an inner surface prescribed by said solid arcuate wall portion such that an inside radius defined by said plurality of breaker bars and said inside radius defined by said perforated arcuate wall portion are equidistant from a common central axis prescribed by said rotatable hammer assembly and said substantially cylindrical grinding chamber.
6 more elements
Dependencies are inferred from the claim text.