Loesche Gmbh

Michael Keyssner

Thomas Letsch

Horst Brundiek

André Baetz

Jörg Bettenworth

Andre′ Baetz

Bernd Schmich

Reinhard Koschorek

André BÄTZ

Frank Fischer-Helwig

The invention relates to a replaceable key grinding pan segment for a grinding track of a grinding pan of a roller mill, the grinding track having an annular shape with an outer circumference and an inner circumference around a center point. The length of the inner edge of the key grinding pan segment closer to the center point is greater here than the length of the outer edge further from the center point. The invention also relates to a grinding pan segment system, a roller mill, and a method for replacing grinding pan segments.

Key grinding pan segment, grinding pan segment system, and method for same

In order to improve the grinding and classification process, the subsequent dust separation, and to optimize the energy situation of a grinding plant, with the aid of a guiding apparatus and a displacement body, the fine material-fluid low leaving the dynamic classifier part with angular momentum, besides a swirl reduction or swirl elimination, is made uniform in a classifier outlet housing and deflected into a virtually linear flow. The fixed guiding apparatus arranged coaxially with the classifier axis in the classifier outlet housing and the displacement body can be formed as one unit and the guide elements of the guiding apparatus can be arranged on the displacement body and extending into the vicinity of the inner wall of the classifier outlet housing.

Method for classifying a ground material-fluid mixture and mill classifier

The invention relates to a roller mill, in particular a coal mill, with a feed system, having an integrated screw feeder. The screw feeder is arranged virtually horizontally in the region of a grit cone and comprises a screw shaft guided through the roller mill and the longitudinal axis thereof, which screw shaft is arranged on both sides respectively outside of the roller mill and at one end with a drive means and at the other end in a bearing outside of the roller mill. The feed material is fed with the screw conveyer outside of the roller mill and forcibly conveyed therein to a tray side rejection opening above a cone opening of the grit cone and drops together with the coarse grain rejected in the classifier centrally onto the grinding pan. An even distribution of the feed material and improved smooth running of the roller mill and energy saving are achieved and also soiling of the screw shaft is avoided.

Roller mill

A method for classifying a ground material-fluid mixture and a mill classifier improve the grinding and classification process, wherein a fine material-fluid flow leaving a dynamic classifier part with angular momentum is subjected to a swirl reduction or swirl elimination, with the aid of a guiding apparatus and a displacement body and is made uniform in a classifier outlet housing and deflected into a virtually linear flow. The fixed guiding apparatus arranged coaxially with the classifier axis in the classifier outlet housing and the displacement body may be formed as one unit, and the guide elements of the guiding apparatus may be arranged on the displacement body and extending into the vicinity of the inner wall of the classifier outlet housing.

To reduce the manufacturing costs of air-swept roller mills and comparable mills and for optimizing the grinding and classifying processes via the flow direction of the fluid-grinding material mixture, according to the invention a blade ring is provided, which has pivotable guide blades. The blade ring is constructed as a polygon blade ring in segment form with at least one outer jacket ring or outer ring, which is constructed in segmented, polygonal manner and comprises a plurality of outer polygon segments formed from planar sheet metal blanks. One or more pivotable guide blades can be arranged with an upper, lower or central pivot axis on the polygon segments and can be pivoted and locked with no or few stages.

Blade ring for air-swept roller mills

To reduce the manufacturing costs of air-swept roller mills and comparable mills, according to the invention a segmented polygonal blade ring is provided, which is manufactured from a plurality of polygon segments, which have planar surfaces and are preferably cut to size from metal sheets. To individual polygon segments can in each case be fixed with a predeterminable inclination one or more guide blades. Preferably an outer polygon segment an an inner polygon segment with at least one guide blade form a polygon segment. Polygon segments can be linked to polygon runs and the latter to polygon blade rings with different diameters.

The invention relates to a mill classifier or sifter, particularly a roller mill classifier, which is suitable as a high-performance classifier for a roller pan mill or a roller mill, e.g. for an air-swept mill. In order to achieve in the case of a particularly simple construction a high flexibility and optimization of the classifying processes as a function of the particular needs, there is a combination of a static distributor formed from several adjustable guide blade rings and a ledge rotor as the dynamic classifier. In order to achieve a multiple classifying and in particular a reduction of the coarse material fraction prior to dynamic classifying, in the vicinity of the static distributor is provided a deflecting device in an area of the classifier cover, through which the disadvantageous effects of a 90.degree. deflection are largely avoided.

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Duesseldorf, Germany

Michael Keyssner