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AssigneeMaschinenfabrik Andritz Actiengesellschaft
InventorsFranz Haider, Martin Zehentner, Johann Lileg, Lars Obitz
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The invention relates to a segment for drum refiners provided with comminuting, in particular grinding surfaces with a projection of hammerhead-shaped cross section for anchoring on the rotor or rotor drum shell. The invention is characterized mainly in that the segment (2') of T-shaped cross section consists of a slim stem (2") and a slim flange (2"') and that the transition surfaces from stem to hammerhead (12) viewed in cross section form an angle (.beta.) of between 15 and 75 degrees, preferably of about 55 degrees, open towards the hammerhead and conveniently equal on both sides with the axis of symmetry (8) of the hammerhead of symmetrical cross section. The ratio of the stem thickness (D) to the segment height (H) conveniently amounts to between 1:5 and 1:9, preferably about 1:7, and the flange thickness (FD) on the stem is about equal to the thickness of the stem. The transistions between flange and stem and between stem and hammerhead conveniently extend along comparatively large radii of curvature (R), for instance along a radius (R) which is equal to one half the time to one time the least thickness (S) of the flange.
A segment for drum refiners for grinding of fibrous material having grinding surfaces, said drum refiners having a rotor, said rotor having a convex outer surface, said rotor being engine-driven, said rotor having an axis, said drum refiner having a material feed, said segment being provided with a projection of hammerhead-shaped cross-section for anchoring on said convex outer surface of said rotor, said hammerhead having an axis of symmetry, said rotor being provided with at least one surface provided with grinding elements composed of said grinding segments, said surfaces being inclined to said rotor axis and said at least one inclined surface having a diameter increasing away from said material feed, said segment being of T-shaped cross section with a stem and a flange, said stem and said flange being of slim configuration, said projection of hammerhead-shaped cross section having a head situated at the end of the segment nearest to said rotor axis, transition surfaces being provided between said stem and said head, and said transition surfaces from stem to said head viewed in cross section forming an angle of between 15 and 75 degrees open towards said head with the axis of symmetry of the hammerhead being symmetrical in cross section.
A segment for drum refiners for grinding of wet fibrous material having grinding surfaces, said drum refiners having a rotor, said rotor having a convex outer surface, said rotor being engine-driven, said rotor having an axis, said drum refiner having a material feed, said segment being provided with a projection of hammerhead-shaped cross section for anchoring on said convex outer surface of said rotor, said hammerhead having an axis of symmetry, said rotor being provided with at least one surface provided with grinding elements composed of said grinding segments, said surfaces being inclined to said rotor axis and said at least one inclined surface having as diameter increasing away from said material feed, said segment being of T-shaped cross section with a stem and a flange, said stem and said flange being of slim configuration, said projection of hammerhead-shaped cross section having a head situated at the end of the segment nearest to said rotor axis, transition surfaces being provided between said stem and said head, and that said transition surfaces form stem to said head viewed in cross section form an angle of between 15 and 75 degrees open towards said head with the axis of symmetry of the hammerhead being symmetrical in cross section.
A segment for drum refiners having comminuting surfaces, said drum refiners having a rotor, said rotor having a convex outer surface, said rotor being engine-driven, said rotor having an axis, said drum refiner having a material feed, said segment being provided with a projection of hammerhead-shaped cross section for anchoring on said convex outer surface of said rotor, said hammerhead having an axis of symmetry, said rotor begin provided with at least one surface provided with comminuting elements composed of said comminuting segments, said surfaces being inclined to said rotor axis and said at least one inclined surface having a diameter increasing away form said material feed, said segment being of T-shaped cross section with a stem and a flange, said stem and said flange being of slim configuration, said projection of hammerhead-shaped cross section having a head situated at the end of the segment nearest said rotor axis, transition surfaces being provided between said stem and said head, and said transition surfaces form stem to said head viewed in cross section forming an angle of between 15 and 75 degrees open towards said head with the axis of symmetry of the hammerhead being symmetrical in cross section.
A structure for drum refiners, said drum refiners having a rotor and having segments on said rotor, said rotor having a convex outer surfaces, said segments having comminuting surfaces, said rotor being engine-driven, said rotor having an axis, said drum refiner having a material feed, said segments being provided with a projection of hammerhead-shaped cross section for anchoring on said convex outer surface of said rotor, said hammerhead having an axis of symmetry, said rotor being provided wit at least one surface provided with comminuting elements composed of said segments, said surfaces being inclined to said rotor axis and said at least one inclined surface having a diameter increasing away from said material feed, said segment being of T-shaped cross section with a stem and a flange, said stem and said flange being of slim configuration, said projection of hammerhead-shaped cross section having a head situated at the end of the segment nearest to said rotor axis, transition surfaces being provided between said stem and said head and said transition surfaces form said stem to said head viewed in cross section forming an angle of between 15 and 75 degrees open towards said head with the axis of symmetry of the hammerhead being symmetrical in cross section and for the releasable anchoring of the hammerheads of the segments, rotor webs of hammerhead-shaped cross section grasp the segment hammerheads, said segment hammerheads and said rotor hammerheads having heads, the thickness of the heads of the rotor hammerheads substantially exceeding the thickness of the heads of the segment hammerheads.
A structure for drum refiners having a rotor and having segments on said rotor, said rotor having a convex outer surface, said segments having precrushing surfaces, said rotor being engine-driven, said rotor having an axis said drum refiners having a material feed, said segments being provided with a projection of hammerhead-shaped cross section for anchoring on said convex outer surface of said rotor, said hammerhead having an axis of symmetry, said rotor being provided with at least one surface provided with precrushing elements composed of comminuting segments, said surfaces being parallel to said rotor axis, said segments being of T-shaped cross section with a stem and a flange, said stem and said flange being of slim configuration, said projection of hammerhead-shaped cross section having a head situated at the end of the segment nearest to said rotor axis, transition surface being provided between said stem and said head and said transition surfaces from said stem to said head viewed in cross section forming an angle of between 15 and 75 degrees open towards said head with the axis of symmetry of the hammerhead being symmetrical in cross section and for the releasable anchoring of the hammerheads of the segments, rotor webs of hammerhead-shaped cross section grasps the segment hammerheads, said segment hammerheads and said rotor hammerheads having heads, the thickness of the heads of the rotor hammerheads substantially exceeding the thickness of the heads of the segment hammerheads.
A structure for drum refiners, said drum refiners having a rotor and having segments on said rotor, said rotor having a convex outer surface, said segments having comminuting surfaces, said rotor being engine-driven, said rotor having an axis, said drum refiners having a material feed, said segment being provided with a projection of hammerhead-shaped cross section for anchoring on said convex outer surface of said rotor, said hammerhead having an axis of symmetry, said rotor being provided with at least one surface provided with precrushing elements and with at least one surface provided with grinding elements both elements composed of said comminuting segments, said at least one surface with precrushing elements extending approximately parallel to said rotor axis and with at least one surface with grinding elements being inclined to said rotor axis and said at least one inclined surface having a diameter increasing away form said material feed, said segments being of T-shaped cross section with a stem and a flange, said stem and said flange being of slim configuration, said projection of hammerhead-shaped cross section having a head situated at the end of the segment nearest to said rotor axis, transition surfaces being provided between said stem and said head and said transition surfaces from said stem to said head viewed in cross section forming an angle of between 15 and 75 degrees open towards said head with the axis of symmetry of the hammerhead being symmetrical in cross section and for the releasable anchoring of the hammerheads of the segments, rotor webs of hammerhead-shaped cross section grasp the segment hammerheads, said segment hammerheads and said rotor hammerheads having heads, the thickness of the heads of the rotor hammerheads substantially exceeding the thickness of the heads of the segment hammerheads.
Dependencies are inferred from the claim text.