Impact hammer mill
AssigneeKHD Industrieanlagen Ag
InventorHorst Schmidt
Life of this patent
Estimating the term…
Abstract
A hammer mill has a plurality of hammer assemblies pivotally mounted about the periphery of a rotating rotor. Each hammer assembly has an arm portion connected to a pivot shaft and carrying a detachable head with slightly inclined impact surface. An equalization mass is attached to a rear side of the arm portion with its center of gravity rearwardly of a line between the center of gravity of the entire hammer assembly and the pivot shaft. As the material of the hammer wears away, the center of gravity of the assembly moves rearwardly, pivoting the hammer head forwardly under the centrifugal forces imposed. The wearing life of the head is increased and an optimum impact angle is maintained by the equalization weight. The head is made detachable from the arm but is positively locked during operation.
Claims11
An impact hammer mill apparatus comprising:
- at least two hammer assemblies having arm portions and equalization masses, the hammers being arranged symmetrically about a periphery of said rotor;
- each of said hammer assemblies being pivotable about a pivot axis through its respective arm and parallel to and offset from said rotor axis;
- each of said hammers having a wearing head with an impact surface facing in the general direction of rotation of the rotors;
- and
- each said equalization masses being affixed to a side of the arm portion of each of said hammers circumferentially opposite the impact surface of the head thereof and having a center of gravity behind a radial line connecting the pivot axis with the rotor axis, with respect to the direction of rotation of the rotor, whereby the impact surface of the head is maintained in an optimum impact orientation, despite wear thereof, by centrifugal forces acting upon the equalization mass and the wearing head.
An impact hammer assembly affixed pivotally on a shaft on a rotor rotating in a direction, the shaft being offset from an axis of rotation of the rotor, and the hammer assembly comprising:
- an arm portion received on said pivot shaft and having a radially outward end;
- an impact head portion detachably received on said end of said arm portion radially outward of said shaft;
- an impact surface carried on said head portion and facing generally in said direction of rotation of said rotor;
- and
- an equalization mass carried on said arm rearwardly of a line between said shaft and a center of gravity of said hammer assembly with respect to said direction of rotation of the rotor.
The method of correcting for wear of a hammer face on a hammer assembly of an impact hammer mill comprising:
- mounting the hammer assembly on the rotor with the wearable hammer surface facing in the direction of rotation, and mounting an equalization mass on the hammer arm circumferentially offset from the axis of the hammer arm so that as the hammer face wears the equalization mass will cause the hammer arm to pivot and maintain the hammer face in an optimum position relative to the rotor.
An impact hammer mill apparatus comprising:
- a hammer mill rotor;
- a hammer assembly having an arm portion pivotally mounted on the periphery of the rotor;
- an impact hammer mounted on the arm having a wearing surface facing in the direction of rotation of the rotor;
- and an equalization mass carried on said arm circumferentially offset from the pivotal axis of the rotor so that said mass applies a centrifugal force to the arm during rotation with said mass positioned to change the angular position of the arm on the rotor with wear of the hammer face and reduction of weight of the hammer so that the face maintains an optimum impact orientation despite wear thereof.
Dependencies are inferred from the claim text.