EP4135901B1 - Milling track segment system and corresponding method - Google Patents

Milling track segment system and corresponding method Download PDF

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Publication number
EP4135901B1
EP4135901B1 EP20720400.9A EP20720400A EP4135901B1 EP 4135901 B1 EP4135901 B1 EP 4135901B1 EP 20720400 A EP20720400 A EP 20720400A EP 4135901 B1 EP4135901 B1 EP 4135901B1
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Prior art keywords
grinding
grinding pan
segment
segments
key
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EP20720400.9A
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German (de)
French (fr)
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EP4135901A1 (en
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Jörg BETTENWORTH
Michael Keyssner
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Loesche GmbH
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Loesche GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/003—Shape or construction of discs or rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B02C2210/02—Features for generally used wear parts on beaters, knives, rollers, anvils, linings and the like

Definitions

  • the invention relates to a grinding table segment system for a grinding track of a grinding table of a roller mill.
  • the invention relates to a method for removing grinding table segments from a grinding table with a grinding table segment system.
  • the ring-shaped grinding track usually has equally sized, interchangeable segments that have a shape similar to a piece of cake. This means that they are trapezoidal in shape and have a longer outer edge than their inner edge. To be precise, both the outer edge and the inner edge describe an arched shape, which is due to the ring-shaped design of the grinding track. However, it is also possible to make the inner and outer edges straight, so that the grinding track has a polygonal shape that is similar to a ring shape.
  • a grinding table is often also referred to as a grinding bowl.
  • the grinding table segments are also referred to as grinding table plates or plate segments.
  • the grinding table segments are also often referred to as grinding plates or grinding bowl armor.
  • the invention is therefore based on the object of specifying a grinding table segment system and a method for exchanging grinding table segments, which facilitate the exchange process.
  • the invention is based on the basic idea of deviating from the previously classic form used. Because the replaceable key grinding plate segment is dimensioned in such a way that it no longer jams itself when pushed towards the center of the grinding plate due to its geometric shape, it is possible to remove the key grinding plate segment in this way.
  • Another advantage of this design is that the gap between the key grinding plate segment and its connecting edges to the adjacent grinding plate segments automatically increases, thus eliminating the problems are minimized by solidified ground material or do not come into effect in this form.
  • a pressing recess is provided on the outer edge of the key grinding plate segment for attaching a press for the exchange process.
  • a pressing tool can be attached using this pressing recess and press the key grinding plate segment towards the center of the grinding plate.
  • the pressing tool can be attached between the pressing recess and the edge of the main body of the grinding plate.
  • the pressing recess is designed in such a way that it can be covered by a retaining edge component during operation. This means that it is designed in such a way that the construction prevents, as far as possible, crushed ground material from being pressed into the pressing recess.
  • a grinding plate segment system for a grinding track of a grinding plate of a roller mill with several grinding plate segments, each of which has an inner edge and an outer edge. The two edges are connected by two connecting edges. The length of the inner edges is less than the length the outer edge.
  • the standard grinding plate segments have a shape similar to a piece of cake, but the tip is missing.
  • the grinding table segment system further comprises at least one key grinding table segment and at least one compensating grinding table segment, which is arranged next to the key grinding table segment.
  • the grinding plate which is constructed from the grinding plate segment system, or the rolling surface of the rollers, to be replaced relatively easily without the need for laborious removal and crushing of material from the joints, as previously described in the prior art.
  • the grinding plate segments are designed as standard grinding plate segments of the same size and shape, and the key grinding plate segment and the at least one compensating grinding plate segment together form the shape of one or more standard grinding plate segments.
  • This dimensioning of the exchangeable key grinding table segment and the provision of a compensating grinding table segment, which together form the shape of one or more standard grinding table segments, means that all other standard grinding table segments can be designed in the same way. This makes storage easier and means that only a few different grinding table components need to be kept in stock. Conventional segments can also continue to be used for this purpose.
  • Grinding table segments can also be called grinding plates.
  • two compensating grinding plate segments are provided in an arrangement to the left and right of the key grinding plate segment.
  • the two compensating grinding plate segments can be designed essentially mirror-symmetrically to an axis on the radius of the grinding plate through the key grinding plate segment. This axis can, for example, be the axis of symmetry on the radius of the key grinding plate segment.
  • Such a design makes it easy to achieve the size of one or more standard grinding plate segments using a key grinding plate segment and two compensating grinding plate segments. This is made even easier by providing mirror-symmetrical compensating grinding plate segments.
  • the grinding plate segments can also be designed as compensating grinding plate segments.
  • the grinding plate segments can also be designed as compensating grinding plate segments.
  • a key grinding plate segment is followed by a compensating grinding plate segment.
  • standard grinding plate segments as described above, are no longer used.
  • the compensating grinding plate segments can also be viewed as a combination, as described in the previous embodiment, of standard grinding plate segments with compensating grinding plate segments, provided that these are made in one piece. In this case, it is only necessary to have two different types of grinding plate segments available.
  • Another advantage is that several key grinding plate segments are provided, so that it is irrelevant in which position the grinding plate comes to rest in relation to the grinding rollers arranged above it. Otherwise, care must be taken to ensure that the key grinding plate segment does not come to rest in the area of a roller, as this would make disassembly complicated and ideally the bowl would have to be rotated further.
  • the grinding plate segments i.e. the standard grinding plate segments, the key grinding plate segment(s) and/or the compensating grinding plate segments, can be fastened to the grinding plate by means of a one- or multi-part clamping ring.
  • the design provides that the clamping ring is attached to the inner circumference of the grinding track, i.e. to the inner edge of the grinding plate segments. and thus presses the grinding table segments outwards against an edge of the grinding table base body.
  • the invention further relates to a roller mill with a grinding table, wherein the grinding table has a grinding table segment system according to the invention.
  • Such a roller mill has the advantage that replacing the grinding track, i.e. the individual grinding plate segments, and installing new ones can be done much more quickly than with conventional grinding plate segments. This is because the key grinding plate segment can be removed very easily from the grinding track and it is hardly necessary to remove the grinding material that has accumulated on the edge between the key grinding plate segment and the neighboring segments before removing the key grinding plate segment.
  • Fig.1 is a schematic representation of a top view of a grinding table 4 with a grinding track 5 according to a first embodiment.
  • the grinding track 5 is made up of a key grinding table segment 10, two mirror-symmetrically formed compensating grinding table segments 11 and ten standard grinding table segments 12.
  • the key grinding plate segment 10 has an outer edge 31, an inner edge 32 and two lateral connecting edges 33.
  • the standard grinding plate segments 12 also have an outer edge 41, an inner edge 42 and two connecting edges 43.
  • the outer edge 31 of the key grinding plate segment 10 according to the invention has a shorter length than its inner edge 32. As a result, the key grinding plate segment 10 can be pushed inwards towards the grinding plate center 6.
  • this offers the advantage that by pushing the key grinding plate segment 10 inwards, the free space between the connecting edges 33 of the key grinding plate segment 10 and the adjacent connecting edges 53 of the compensating grinding plate segments 11 increases. This also means that ground material pressed into it cannot prevent it from being pushed inwards.
  • the key grinding table segment 10 has the size of two normal standard grinding table segments 12. This means that standard elements can be used for the rest of the grinding path.
  • FIG.2 An alternative design of the grinding table 5 is shown.
  • the grinding table 5 according to this embodiment has, for example, six key grinding table segments 10 and, for example, six compensating grinding table segments 11. These are arranged alternately on the grinding table 5.
  • the standard grinding plate segments 12 are omitted here.
  • only two different types of grinding table segments are used. This simplifies storage.
  • a further advantage of this embodiment is that the first key grinding table segment 10, which is removed by pushing it inwards towards the grinding table center 6, can be freely selected.
  • Fig.3 a sectional view through a grinding table 4 is shown.
  • a pressing recess 15 is shown in the right-hand area of the key grinding table segment 10. This is covered by a retaining edge 26.
  • the position of the retaining edge 26 ensures that hardly any or at least very little grinding material gets into the pressing recess 15 during operation, i.e. during the grinding processes.
  • the key grinding plate segment 10 itself is arranged and fastened in a recess in the grinding plate body 7 by means of a clamping ring 20.
  • the key grinding plate segment 10 is inserted, then the clamping ring 20 is attached. This is fastened using a screw 21. Due to the wedge shape, the clamping ring presses the key grinding plate segment 10 against the outer edge of the grinding plate when the screw 21 is tightened.
  • the other grinding plate segments 11, 12 are fastened in a similar way before or after.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Adjustment And Processing Of Grains (AREA)

Description

Die Erfindung betrifft ein Mahltellersegmentsystem für eine Mahlbahn eines Mahltellers einer Wälzmühle.The invention relates to a grinding table segment system for a grinding track of a grinding table of a roller mill.

Ferner betrifft die Erfindung noch ein Verfahren zum Entfernen von Mahltellersegmenten von einem Mahlteller mit einem Mahltellersegmentsystem.Furthermore, the invention relates to a method for removing grinding table segments from a grinding table with a grinding table segment system.

Gängige Wälzmühlen weisen einen Mahlteller auf, welcher sich unter den ortsfest drehbar gelagerten Mahlwalzen dreht. Der Mahlteller besitzt eine Mahlbahn, auf der die Mahlwalzen abrollen. Zwischen dem Mahlteller beziehungsweise der Mahlbahn und den Mahlwalzen befindet sich im Betrieb zu zerkleinerndes Mahlgut. Die Mahlwalzen wirken durch ihre eigene Gewichtskraft, werden zum Teil aber auch noch mit zusätzlicher Kraft beaufschlagt, so dass sie auf die Mahlbahn und damit auf den Mahlteller drücken. Während des Betriebs entsteht durch die auftretenden Kräfte sowie den Materialabrieb durch Mahlgut ein Verschleiß zum einen an den Mahlwalzen zum anderen auch auf der Mahlbahn. Daher ist die Mahlbahn bei den meisten Wälzmühlen austauschbar ausgeführt.Common roller mills have a grinding table that rotates under the stationary, rotatable grinding rollers. The grinding table has a grinding track on which the grinding rollers roll. During operation, the material to be ground is located between the grinding table or the grinding track and the grinding rollers. The grinding rollers act due to their own weight, but are sometimes also subjected to additional force so that they press on the grinding track and thus on the grinding table. During operation, the forces that occur and The material abrasion caused by the material being ground causes wear on the grinding rollers and also on the grinding track. For this reason, the grinding track on most roller mills is designed to be replaceable.

Üblicherweise weist die ringförmige Mahlbahn gleichgroße austauschbare Segmente auf, welche eine kuchenstückähnliche Form aufweisen. Dies bedeutet, dass sie trapezähnlich ausgebildet sind und an ihrer Außenkante eine größere Länge aufweisen als an ihre Innenkante. Exakterweise beschreibt sowohl die Außenkante als auch die Innenkante eine Bogenform, die durch die ringförmige Ausbildung der Mahlbahn begründet ist. Es ist aber ebenso möglich, die Innen- und Außenkante gerade auszubilden, so dass die Mahlbahn eine vieleckige Form ausbildet, welche einer Ringform angenähert ist. Ein Mahlteller wird oft auch als Mahlschüssel bezeichnet. In ähnlicher Weise werden auch die Mahltellersegmente als Mahltellerplatten oder Plattensegmente bezeichnet. Die Mahltellersegmente werden auch oft als Mahlplatten oder Mahlschüsselpanzerung bezeichnet.The ring-shaped grinding track usually has equally sized, interchangeable segments that have a shape similar to a piece of cake. This means that they are trapezoidal in shape and have a longer outer edge than their inner edge. To be precise, both the outer edge and the inner edge describe an arched shape, which is due to the ring-shaped design of the grinding track. However, it is also possible to make the inner and outer edges straight, so that the grinding track has a polygonal shape that is similar to a ring shape. A grinding table is often also referred to as a grinding bowl. In a similar way, the grinding table segments are also referred to as grinding table plates or plate segments. The grinding table segments are also often referred to as grinding plates or grinding bowl armor.

Problematisch ist bei gängigen Mahltellersegmentsystemen deren Austausch.Replacing conventional grinding table segment systems is problematic.

Während des Betriebes wird durch das Abrollen der Mahlwalzen auf der Mahlbahn in dem Zwischenraum der Segmente, das heißt der Bereich, in dem sich zwei benachbarte Segmente berühren, Mahlgut eingepresst. Obwohl selbstverständlich versucht wird, diese Kante möglichst gering und klein auszubilden, lässt es sich durch die erheblichen Kräfte, die während des Mahlvorgangs auftreten nicht verhindern, dass Mahlgut, insbesondere bereits sehr klein zerkleinertes Mahlgut, dort eindringt. Durch die Kräfte während des Mahlens wird dieses eingedrungene Mahlgut verfestigt und sehr stark komprimiert und somit hart.During operation, the grinding rollers roll along the grinding track, forcing the ground material into the space between the segments, i.e. the area where two adjacent segments touch. Although attempts are made to make this edge as small and as small as possible, the considerable forces that occur during the grinding process mean that ground material, especially material that has already been chopped into very small pieces, cannot be prevented from penetrating this area. The forces during grinding cause this ground material to solidify and compress it very strongly, making it hard.

Zum Austausch der Mahlplatten ist es nun notwendig, zuerst ein Segment zu entfernen, danach die weiteren Segmente. Dieses erste Segment kann jedoch nicht nach innen gezogen werden, da durch die standardmäßige Ausführung mit einer größeren Außenkante und einer kleineren Innenkante dies geometrisch nicht möglich ist. Ein Herausdrücken nach außen vom Mahlteller ausgehend, ist durch die Konstruktion der meisten Mahlteller normalerweise nicht möglich. Herkömmlich wird versucht, das Mahltellersegment nach oben zu heben, indem nach dem Entfernen eines Klemmrings, mit dem die Mahltellersegmente auf dem Mahlteller befestigt sind, versucht wird, von unten dagegen zu drücken.To replace the grinding plates, it is now necessary to first remove one segment, then the other segments. However, this first segment cannot be pulled inwards, as this is geometrically impossible due to the standard design with a larger outer edge and a smaller inner edge. Pushing it outwards from the grinding plate is normally not possible due to the design of most grinding plates. Traditionally, attempts are made to lift the grinding plate segment upwards by removing a clamping ring, with which the grinding table segments are attached to the grinding table, an attempt is made to press against it from below.

Durch das eingepresste Mahlmaterial ist dies jedoch sehr schwer möglich, so dass ein Ausbau des ersten Segmentes oft mehrere Stunden oder sogar Tage in Anspruch nimmt. Es ist nicht unüblich, dass hierbei sogar die Kante beziehungsweise die Fuge zwischen zwei benachbarten Mahltellersegmenten mittels Brennschneiden unter zu Hilfenahme eine sogenannten. Fugenhobels bearbeitet wird. Gattungsgemäße Mahltellersegmente gehen beispielsweise aus der DE 1507629 oder der DE 1507580 hervor. GB 761696 A offenbart ein Mahltellersegmentsystem, das u.a. Segmente mit parallelen Verbindungskanten aufweist, wobei es vorgesehen ist, die besagten Segmente bei einer Demontage radial nach innen zu verschieben.However, this is very difficult due to the pressed-in grinding material, so that the removal of the first segment often takes several hours or even days. It is not unusual for the edge or the joint between two adjacent grinding plate segments to be processed by means of flame cutting with the aid of a so-called joint planer. Generic grinding plate segments originate, for example, from the DE 1507629 or the DE 1507580 out. GB761696A discloses a grinding table segment system which, inter alia, comprises segments with parallel connecting edges, wherein it is provided that said segments are displaced radially inwards during disassembly.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Mahltellersegmentsystem sowie ein Verfahren zum Austauschen von Mahltellersegmenten anzugeben, welche den Austauschvorgang erleichtern.The invention is therefore based on the object of specifying a grinding table segment system and a method for exchanging grinding table segments, which facilitate the exchange process.

Diese Aufgabe wird erfindungsgemäß durch ein Mahltellersegmentsystem mit den Merkmalen des Anspruchs 1 sowie ein Verfahren mit den Merkmalen des Anspruchs 13 gelöst.This object is achieved according to the invention by a grinding table segment system having the features of claim 1 and a method having the features of claim 13.

Vorteilhafte Ausführungsformen der Erfindung sind in den Unteransprüchen und in der Beschreibung sowie den Figuren und deren Erläuterung angegeben.Advantageous embodiments of the invention are specified in the subclaims and in the description as well as the figures and their explanation.

Bei dem offenbarten Schlüssel-Mahltellersegment ist vorgesehen, dass die Länge der näher zum Mittelpunkt liegenden Innenkante größer ist als die Länge der weiter vom Mittelpunkt entfernt liegenden Außenkante.In the disclosed key grinding table segment, the length of the inner edge closer to the center is greater than the length of the outer edge further away from the center.

Der Erfindung liegt der Grundgedanke zugrunde, von der bisher klassischen benutzten Form abzuweichen. Dadurch, dass das austauschbare Schlüssel-Mahltellersegment so dimensioniert ist, dass es sich bei einem Schieben in Richtung Mahltellermittelpunkt durch seine geometrische Form nicht mehr selbst verklemmt, ist es möglich, das Schlüssel- Mahltellersegment derart zu entfernen.The invention is based on the basic idea of deviating from the previously classic form used. Because the replaceable key grinding plate segment is dimensioned in such a way that it no longer jams itself when pushed towards the center of the grinding plate due to its geometric shape, it is possible to remove the key grinding plate segment in this way.

Ein weiterer Vorteil dieser Konstruktion ist auch, dass sich automatisch der Spalt zwischen dem Schlüssel-Mahltellersegment und seinen Verbindungskanten zu den benachbarten Mahltellersegmenten vergrößert beziehungsweise somit die Probleme durch verfestigtes Mahlgut minimiert werden beziehungsweise nicht in dieser Form zum Tragen kommen.Another advantage of this design is that the gap between the key grinding plate segment and its connecting edges to the adjacent grinding plate segments automatically increases, thus eliminating the problems are minimized by solidified ground material or do not come into effect in this form.

Vorteilhaft ist es, wenn die Außenkante des Schlüssel-Mahltellersegmentes einen Kreisbogen auf dem Außenumfang bildet und die Innenkante des SchlüsselMahltellersegmentes einen Kreisbogen auf dem Innenumfang des Mahltellers ausbildet. Anders ausgedrückt, passt das Schlüssel-Mahltellersegment mit seiner Dimensionierung auf die Mahlbahn des Mahltellers, wobei allerdings die Spitze fehlt.It is advantageous if the outer edge of the key grinding plate segment forms a circular arc on the outer circumference and the inner edge of the key grinding plate segment forms a circular arc on the inner circumference of the grinding plate. In other words, the key grinding plate segment fits the grinding track of the grinding plate with its dimensions, although the tip is missing.

Ferner verringert sich die Länge eines Kreisbogens, welcher durch das Schlüssel-Mahltellersegment ausgebildet wird, mit der Vergrößerung des Radius von der Innenkante zur Außenkante, wodurch das Schlüssel-Mahltellersegment mit seiner Form eine umgekehrte kuchenstückähnliche Form darstellt.Furthermore, the length of a circular arc formed by the key grinding plate segment decreases with the increase of the radius from the inner edge to the outer edge, whereby the key grinding plate segment with its shape represents an inverted pie-like shape.

Bevorzugt ist es, wenn an der Außenkante des Schlüssel-Mahltellersegmentes eine Pressaussparung zum Ansetzen einer Presse für den Austauschvorgang vorgesehen ist. Mittels dieser Pressaussparung kann ein Presswerkzeug angesetzt werden und das Schlüssel-Mahltellersegment in Richtung des Mittelpunktes des Mahltellers drücken. Das Presswerkzeug kann hierbei zwischen der Pressaussparung und dem Rand des Hauptkörpers des Mahltellers angesetzt werden.It is preferred if a pressing recess is provided on the outer edge of the key grinding plate segment for attaching a press for the exchange process. A pressing tool can be attached using this pressing recess and press the key grinding plate segment towards the center of the grinding plate. The pressing tool can be attached between the pressing recess and the edge of the main body of the grinding plate.

In einer vorteilhaften Ausgestaltung ist die Pressaussparung derart ausgebildet, dass sie im Betrieb von einem Staurandbauteil zu verdecken ist. Dies bedeutet, dass sie derart ausgelegt ist, dass möglichst durch die Konstruktion verhindert wird, dass zerkleinertes Mahlgut in die Pressaussparung gepresst wird.In an advantageous embodiment, the pressing recess is designed in such a way that it can be covered by a retaining edge component during operation. This means that it is designed in such a way that the construction prevents, as far as possible, crushed ground material from being pressed into the pressing recess.

Im Rahnen der Erfindung kann unter dem Ausdruck "im Betrieb" eine einsatzfähige Wälzmühle verstanden werden. Dies bedeutet insbesondere, dass der Mahlteller zumindest mühlenseitig fertig aufgebaut ist, das heißt eine Mahlbahn mit einem Staurand vorhanden ist.In the context of the invention, the expression "in operation" can be understood to mean a roller mill that is ready for use. This means in particular that the grinding table is fully constructed at least on the mill side, i.e. a grinding track with a retaining edge is present.

Offenbart ist ein Mahltellersegmentsystem für eine Mahlbahn eines Mahltellers einer Wälzmühle mit mehreren Mahltellersegmenten, welche je eine Innenkante und eine Außenkante aufweisen. Die beiden Kanten sind durch zwei Verbindungskanten verbunden. Die Länge der Innenkanten ist geringer als die Länge der Außenkante. Somit haben die Standard-Mahltellersegmente eine kuchenstückähnliche Form, bei denen allerdings die Spitze fehlt.Disclosed is a grinding plate segment system for a grinding track of a grinding plate of a roller mill with several grinding plate segments, each of which has an inner edge and an outer edge. The two edges are connected by two connecting edges. The length of the inner edges is less than the length the outer edge. The standard grinding plate segments have a shape similar to a piece of cake, but the tip is missing.

Entsprechend der Erfindung ist vorgesehen, dass das Mahltellersegmentsystem ferner mindestens ein Schlüssel-Mahltellersegment sowie mindestens ein Ausgleichs-Mahltellersegment aufweist, welches neben dem Schlüssel-Mahltellersegment angeordnet ist.According to the invention, it is provided that the grinding table segment system further comprises at least one key grinding table segment and at least one compensating grinding table segment, which is arranged next to the key grinding table segment.

Durch das Vorsehen eines Schlüsselmahltellersegmentes in einem Mahltellersegmentsystem wird ermöglicht, dass der Mahlteller, welcher aus dem Mahltellersegmentsystem aufgebaut ist, beziehungsweise die Abrollfläche der Walzen relativ einfach ausgetauscht werden kann, ohne dass wie zuvor im Stand der Technik beschrieben, ein aufwändiges Entfernen und Zerkleinern von Material aus den Fugen notwendig ist.By providing a key grinding plate segment in a grinding plate segment system, it is possible for the grinding plate, which is constructed from the grinding plate segment system, or the rolling surface of the rollers, to be replaced relatively easily without the need for laborious removal and crushing of material from the joints, as previously described in the prior art.

Vorteilhaft ist es, wenn die Mahltellersegmenten, als gleichgroße und gleich geformten Standard-Mahltellersegmente ausgebildet sind, und das Schlüssel-Mahltellersegment und das mindestens eine Ausgleichs-Mahltellersegment zusammen die Form einer oder mehrerer Standard-Mahltellersegmente ausbilden.It is advantageous if the grinding plate segments are designed as standard grinding plate segments of the same size and shape, and the key grinding plate segment and the at least one compensating grinding plate segment together form the shape of one or more standard grinding plate segments.

Durch diese Dimensionierung des austauschbaren Schlüssel-Mahltellersegmentes und das Vorsehen eines Ausgleichs-Mahltellersegmentes, welche zusammen die Form einer oder mehrere Standard-Mahltellersegmente bilden, kann erreicht werden, dass alle anderen Standard-Mahltellersegmente gleich ausgeführt werden können. Dies erleichtert die Lagerhaltung und ermöglicht es, dass wenig unterschiedliche Mahltellerbauteile vorgehalten werden müssen. Auch können hierfür weiterhin herkömmliche Segmente verwendet werden.This dimensioning of the exchangeable key grinding table segment and the provision of a compensating grinding table segment, which together form the shape of one or more standard grinding table segments, means that all other standard grinding table segments can be designed in the same way. This makes storage easier and means that only a few different grinding table components need to be kept in stock. Conventional segments can also continue to be used for this purpose.

Mahltellersegmente können auch als Mahlplatten bezeichnet werden.Grinding table segments can also be called grinding plates.

Bevorzugt sind zwei Ausgleichs-Mahltellersegmente in einer Anordnung links und rechts des Schlüssel-Mahltellersegmentes vorgesehen. Hierbei können die beiden Ausgleichs-Mahltellersegmentes im Wesentlichen spiegelsymmetrisch zu einer Achse auf dem Radius des Mahltellers durch das Schlüssel-Mahltellersegment ausgebildet sein. Diese Achse kann beispielsweise die Symmetrieachse auf dem Radius des Schlüssel-Mahltellersegmentes sein.Preferably, two compensating grinding plate segments are provided in an arrangement to the left and right of the key grinding plate segment. In this case, the two compensating grinding plate segments can be designed essentially mirror-symmetrically to an axis on the radius of the grinding plate through the key grinding plate segment. This axis can, for example, be the axis of symmetry on the radius of the key grinding plate segment.

Eine derartige Konstruktion ermöglicht es in einfache Weise, mit einem Schlüssel-Mahltellersegment sowie zwei Ausgleichs-Mahltellersegmenten die Größe einer oder mehrerer Standard-Mahltellersegmente zu erreichen. Durch das Vorsehen von spiegelsymmetrisch aufgebauten Ausgleichs-Mahltellersegmenten wird dies weiter vereinfacht.Such a design makes it easy to achieve the size of one or more standard grinding plate segments using a key grinding plate segment and two compensating grinding plate segments. This is made even easier by providing mirror-symmetrical compensating grinding plate segments.

Bevorzugt ist es, wenn zwei Ausgleichs-Mahltellersegmente mit dem Schlüssel-Mahltellersegment die Größe von einem, zwei oder drei Standard-Mahltellersegmenten haben.It is preferred if two compensating grinding plate segments with the key grinding plate segment have the size of one, two or three standard grinding plate segments.

In einer anderen Ausgestaltung können die Mahltellersegmente auch als Ausgleichsmahltellersegmente ausgebildet sein. In diesem Fall ist es vorgesehen, dass mehrere Schlüssel-Mahltellersegmente vorhanden sind. Bevorzugt ist es hierbei, dass gleich viele Ausgleichsmahltellersegmente und Schlüsselmahltellersegmente vorgesehen sind. Anders ausgedrückt, folgt an ein Schlüssel-Mahltellersegment jeweils ein Ausgleichsmahltellersegment. Insofern werden keine Standardmahltellersegmente, wie zuvor beschrieben, mehr eingesetzt. Man kann entsprechend dieser Ausführungsform die Ausgleichsmahltellersegmente auch als eine Kombination, wie in der vorherigen Ausführungsform beschrieben, von Standardmahltellersegmenten mit Ausgleichsmahltellersegmenten betrachten, sofern diese einstückig ausgeführt sind. In diesem Fall ist es lediglich nötig, zwei verschiedene Mahltellersegmenttypen vorzuhalten.In another embodiment, the grinding plate segments can also be designed as compensating grinding plate segments. In this case, it is provided that several key grinding plate segments are present. It is preferred that an equal number of compensating grinding plate segments and key grinding plate segments are provided. In other words, a key grinding plate segment is followed by a compensating grinding plate segment. In this respect, standard grinding plate segments, as described above, are no longer used. According to this embodiment, the compensating grinding plate segments can also be viewed as a combination, as described in the previous embodiment, of standard grinding plate segments with compensating grinding plate segments, provided that these are made in one piece. In this case, it is only necessary to have two different types of grinding plate segments available.

Ein anderer Vorteil ergibt sich dadurch, dass mehrere Schlüssel-Mahltellersegmente vorgesehen sind, so dass es unerheblich ist, in welcher Position der Mahlteller zu den darüber angeordneten Mahlwalzen zum Stehen gekommen ist. Anderenfalls muss darauf geachtet werden, dass das Schlüssel-Mahltellersegment nicht im Bereich einer Walze zum Liegen kommt, da dann die Demontage kompliziert ist und idealerweise die Schüssel weitergedreht werden müsst.Another advantage is that several key grinding plate segments are provided, so that it is irrelevant in which position the grinding plate comes to rest in relation to the grinding rollers arranged above it. Otherwise, care must be taken to ensure that the key grinding plate segment does not come to rest in the area of a roller, as this would make disassembly complicated and ideally the bowl would have to be rotated further.

Vorteilhaft ist es, wenn die Mahltellersegmente, das heißt die Standard-Mahltellersegmente, das oder die Schlüssel-Mahltellersegmente und/oder die Ausgleichs-Mahltellersegmente mittels eines ein- oder mehrteilig ausgebildeten Klemmrings auf dem Mahlteller befestigbar sind. Konstruktionsgemäß ist vorgesehen, dass der Klemmring am Innenumfang der Mahlbahn, also an der Innenkante der Mahltellersegmente anstößt und so die Mahltellersegmente nach außen gegen einen Rand des Mahltellergrundkörpers drückt.It is advantageous if the grinding plate segments, i.e. the standard grinding plate segments, the key grinding plate segment(s) and/or the compensating grinding plate segments, can be fastened to the grinding plate by means of a one- or multi-part clamping ring. The design provides that the clamping ring is attached to the inner circumference of the grinding track, i.e. to the inner edge of the grinding plate segments. and thus presses the grinding table segments outwards against an edge of the grinding table base body.

Die Erfindung betrifft ferner eine Wälzmühle mit einem Mahlteller, wobei der Mahlteller ein erfindungsgemäßes Mahltellersegmentsystem aufweist.The invention further relates to a roller mill with a grinding table, wherein the grinding table has a grinding table segment system according to the invention.

Ein derartige Wälzmühle hat den Vorteil, dass beim Austausch der Mahlbahn, das heißt der einzelnen Mahltellersegmente und dem Einbau neuer, diese deutlich schneller durchgeführt werden kann als bei herkömmlichen Mahltellersegmenten. Dies ist dadurch begründet, dass das Schlüssel-Mahltellersegment sehr einfach aus der Mahlbahn entfernt werden kann und es kaum notwendig ist, dass sich das an der Kante zwischen dem Schlüssel-Mahltellersegment und den benachbarten Segmenten angesammelte Mahlgut vor dem Ausbau des Schlüssel-Mahltellersegmentes zu entfernen.Such a roller mill has the advantage that replacing the grinding track, i.e. the individual grinding plate segments, and installing new ones can be done much more quickly than with conventional grinding plate segments. This is because the key grinding plate segment can be removed very easily from the grinding track and it is hardly necessary to remove the grinding material that has accumulated on the edge between the key grinding plate segment and the neighboring segments before removing the key grinding plate segment.

Abschließend betrifft die Erfindung noch ein Verfahren zum Entfernen eines Mahltellersegmentes aus einer Mahlbahn eines Mahltellers einer Wälzmühle mit einem erfindungsgemäßen Mahltellersegmentsystem. Hierbei ist vorgesehen, dass zuerst der Klemmring und der Stauring vom Mahlteller entfernt werden. So liegt nun die Pressaussparung des erfindungsgemäßen Schlüssel-Mahltellersegmentes offen. Nun kann ein Presswerkzeug an die Pressaussparung angesetzt werden und das Schlüssel-Mahltellersegment in Richtung Zentrum des Mahltellers gedrückt werden. Als Gegenlager dient hierbei der Hauptkörper des Mahltellers.Finally, the invention relates to a method for removing a grinding plate segment from a grinding track of a grinding plate of a roller mill with a grinding plate segment system according to the invention. In this case, the clamping ring and the retaining ring are first removed from the grinding plate. The pressing recess of the key grinding plate segment according to the invention is now open. A pressing tool can now be placed on the pressing recess and the key grinding plate segment can be pressed towards the center of the grinding plate. The main body of the grinding plate serves as the counter bearing.

Der Raum, in dem das Schlüssel-Mahltellersegment gedrückt wird, wurde zuvor durch den Klemmring eingenommen. Nachdem das Schlüssel-Mahltellersegment entfernt wurde, können die restlichen Mahltellersegmente entfernt werden. Auch hierbei ist es nicht mehr notwendig, die Kante beziehungsweise die Nut zwischen zwei benachbarten Mahltellersegmenten zuerst von verfestigtem Mahlgut zu reinigen, da immer auf einer Seite kein weiteres Mahltellersegment vorhanden ist, so dass ein leichtes Rutschen auf dieser Seite genug Spielraum bietet.The space in which the key grinding plate segment is pressed was previously occupied by the clamping ring. After the key grinding plate segment has been removed, the remaining grinding plate segments can be removed. Here too, it is no longer necessary to first clean the edge or groove between two adjacent grinding plate segments of solidified grinding material, as there is always no further grinding plate segment on one side, so that a slight sliding on this side offers enough room.

Die Erfindung wird nachfolgend anhand eines schematischen Ausführungsbeispiels und unter Bezugnahme auf die Figuren erläutert. Hierbei zeigen:

  • Fig. 1 eine schematische Aufsicht auf einen Mahlteller mit einer Mahlbahn entsprechend einer ersten Ausführungsform;
  • Fig. 2 eine schematische Aufsicht auf einen Mahlteller mit einer Mahlbahn entsprechend einer zweiten Ausführungsform; und
  • Fig. 3 eine Schnittansicht durch einen Mahlteller mit einer Mahlbahn.
The invention is explained below using a schematic embodiment and with reference to the figures.
  • Fig.1 a schematic plan view of a grinding table with a grinding track according to a first embodiment;
  • Fig.2 a schematic plan view of a grinding table with a grinding track according to a second embodiment; and
  • Fig.3 a sectional view through a grinding table with a grinding track.

In Fig. 1 ist eine schematische Darstellung einer Aufsicht auf einen Mahlteller 4 mit einer Mahlbahn 5 nach einer ersten Ausführungsform dargestellt. Die Mahlbahn 5 ist aus einem Schlüssel-Mahltellersegment 10, zwei spiegelsymmetrisch ausgeformten Ausgleichs-Mahltellersegmenten 11 sowie zehn Standard-Mahltellersegmenten 12 aufgebaut.In Fig.1 is a schematic representation of a top view of a grinding table 4 with a grinding track 5 according to a first embodiment. The grinding track 5 is made up of a key grinding table segment 10, two mirror-symmetrically formed compensating grinding table segments 11 and ten standard grinding table segments 12.

Das Schlüssel-Mahltellersegment 10 weist eine Außenkante 31, eine Innenkante 32 und zwei seitliche Verbindungskanten 33 auf. In ähnlicher Weise weisen auch die Standard-Mahltellersegmente 12 eine Außenkante 41, eine Innenkante 42 sowie zwei Verbindungskanten 43 auf. Selbiges ist auch bei den beiden AusgleichsMahltellersegmenten 11 der Fall, welche eine Außenkante 51, eine Innenkante 52 und zwei Verbindungskanten 53 aufweisen. Wie in Fig. 1 dargestellt, hat die Außenkante 31 des erfindungsgemäßen Schlüssel-Mahltellersegmentes 10 eine geringere Länge als seine Innenkante 32. Hierdurch kann das Schlüssel-Mahltellersegment 10 nach innen in Richtung Mahltellerzentrum 6 geschoben werden.The key grinding plate segment 10 has an outer edge 31, an inner edge 32 and two lateral connecting edges 33. Similarly, the standard grinding plate segments 12 also have an outer edge 41, an inner edge 42 and two connecting edges 43. The same is also the case with the two compensating grinding plate segments 11, which have an outer edge 51, an inner edge 52 and two connecting edges 53. As in Fig.1 As shown, the outer edge 31 of the key grinding plate segment 10 according to the invention has a shorter length than its inner edge 32. As a result, the key grinding plate segment 10 can be pushed inwards towards the grinding plate center 6.

Wie für den Fachmann ersichtlich, bietet dies den Vorteil, dass sich durch das Schieben des Schlüssel-Mahltellersegmentes 10 nach innen der Freiraum zwischen den Verbindungskanten 33 des Schlüssel-Mahltellersegmentes 10 und den angrenzenden Verbindungskanten 53 des Ausgleichs-Mahltellersegmenten 11 vergrößert. Dies bedeutet auch, dass hierin eingepresstes Mahlgut ein nach-innen-Schieben nicht verhindern kann.As will be apparent to the person skilled in the art, this offers the advantage that by pushing the key grinding plate segment 10 inwards, the free space between the connecting edges 33 of the key grinding plate segment 10 and the adjacent connecting edges 53 of the compensating grinding plate segments 11 increases. This also means that ground material pressed into it cannot prevent it from being pushed inwards.

Zusammen mit den beiden angrenzenden Ausgleichs-Mahltellersegmenten 11 hat das Schlüssel-Mahltellersegment 10 die Größe zweier normaler Standard-Mahltellersegmente 12. So können für die restliche Mahlbahn Standard-Elemente verwendet werden.Together with the two adjacent compensating grinding table segments 11, the key grinding table segment 10 has the size of two normal standard grinding table segments 12. This means that standard elements can be used for the rest of the grinding path.

In Fig. 2 ist eine alternative Ausgestaltung des Mahltellers 5 dargestellt. Im Folgenden wird lediglich auf die Unterschiede zu der Ausführung nach Fig. 1 eingegangen. Der Mahlteller 5 entsprechend dieser Ausführungsform weist beispielhaft sechs Schlüssel-Mahltellersegmente 10 sowie beispielhaft sechs AusgleichsMahltellersegmente 11 auf. Diese sind jeweils alternierend auf dem Mahlteller 5 angeordnet. Wie in Zusammenschau mit der Ausführungsform aus Fig. 1 ersichtlich, wird hierbei auf die Standard-Mahltellersegmente 12 verzichtet. Im Gegensatz zu der Ausführungsform nach Fig. 1 werden jedoch nur zwei unterschiedliche Mahltellersegmentarten eingesetzt. Dies vereinfacht die Lagerhaltung. Ein weiterer Vorteil dieser Ausführungsform ist, dass das erste Schlüssel-Mahltellersegment 10, welches entfernt wird, indem es nach innen in Richtung des Mahltellerzentrums 6 geschoben wird, frei gewählt werden kann. Dies ist insbesondere interessant, da im ungünstigen Fall beim Anhalten der Mühle ein Schlüssel-Mahltellersegment 10 genau unter der Walze zu liegen kommen könnte, so dass die Mühle erneut angefahren werden müsste. In der Ausführungsform entsprechend Fig. 2 ist dies deutlich unwahrscheinlicher, da die Teilung der Mahltellersegmente deutlich größer ist als die Anzahl der Mahlwalzen.In Fig.2 An alternative design of the grinding table 5 is shown. In the following, only the differences to the design according to Fig.1 The grinding table 5 according to this embodiment has, for example, six key grinding table segments 10 and, for example, six compensating grinding table segments 11. These are arranged alternately on the grinding table 5. As can be seen in conjunction with the embodiment from Fig.1 As can be seen, the standard grinding plate segments 12 are omitted here. In contrast to the embodiment according to Fig.1 However, only two different types of grinding table segments are used. This simplifies storage. A further advantage of this embodiment is that the first key grinding table segment 10, which is removed by pushing it inwards towards the grinding table center 6, can be freely selected. This is particularly interesting because in the worst case scenario, when the mill is stopped, a key grinding table segment 10 could end up lying exactly under the roller, so that the mill would have to be started up again. In the embodiment according to Fig.2 This is much less likely because the pitch of the grinding table segments is significantly larger than the number of grinding rollers.

In Fig. 3 ist eine Schnittansicht durch einen Mahlteller 4 dargestellt. Hierbei ist eine Pressaussparung 15 im rechten Bereich des Schlüssel-Mahltellersegmentes 10 gezeigt. Diese ist von einem Staurand 26 verdeckt. Durch die Lage des Staurandes 26 wird sichergestellt, dass kaum oder zumindest nur sehr wenig Mahlgut während des Betriebes, also während der Mahlvorgänge in die Pressaussparung 15 gelangt.In Fig.3 a sectional view through a grinding table 4 is shown. Here, a pressing recess 15 is shown in the right-hand area of the key grinding table segment 10. This is covered by a retaining edge 26. The position of the retaining edge 26 ensures that hardly any or at least very little grinding material gets into the pressing recess 15 during operation, i.e. during the grinding processes.

Das Schlüssel-Mahltellersegment 10 selbst ist mittels eines Klemmrings 20 in einer Vertiefung im Mahltellerkörper 7 angeordnet und befestigt.The key grinding plate segment 10 itself is arranged and fastened in a recess in the grinding plate body 7 by means of a clamping ring 20.

Zum Einbau der Mahlbahn 5 wird in diesem Fall das Schlüssel-Mahltellersegment 10 eingesetzt, anschließend wird der Klemmring 20 angebracht. Dieser wird mittels einer Schraube 21 befestigt. Durch die Keilform presst der Klemmring beim Anziehen der Schraube 21 das Schlüssel-Mahltellersegment 10 an den Außenrand des Mahltellers. Die weiteren Mahltellersegmente 11, 12 werden in ähnlicher Weise vorher oder nachher befestigt.In this case, to install the grinding track 5, the key grinding plate segment 10 is inserted, then the clamping ring 20 is attached. This is fastened using a screw 21. Due to the wedge shape, the clamping ring presses the key grinding plate segment 10 against the outer edge of the grinding plate when the screw 21 is tightened. The other grinding plate segments 11, 12 are fastened in a similar way before or after.

Beim Ausbau wird in umgekehrter Reihenfolge vorgegangen. Hierbei ist es wesentlich, dass zuerst das Schlüssel-Mahltellersegment 10 vor den anderen Mahltellersegmenten 11, 12 entfernt wird. Hierzu wird zunächst die Schraube 21 gelöst, damit der Klemmring 20 entfernt werden kann. Simultan, vorher oder nachher, wird auch der Stauring 26 abgebaut. Daraufhin kann ein Presswerkzeug in die Pressaussparung 15 eingesetzt werden und so das Schlüssel-Mahltellersegment 10 in den Raum gedrückt werden, in dem sich zuvor der Klemmring 20 befand. Nachdem das Schlüssel-Mahltellersegment 10 entfernt wurde, können auch die weiteren Mahltellersegmente 11,12 relativ einfach entfernt werden.When removing, proceed in reverse order. It is important that the key grinding plate segment 10 is removed first before the other grinding plate segments 11, 12. To do this, first loosen the screw 21 so that the clamping ring 20 can be removed. Simultaneously, before or after, the retaining ring 26 is also removed. A pressing tool can then be inserted into the pressing recess 15 and the key grinding plate segment 10 can be pressed into the space in which the clamping ring 20 was previously located. After the key grinding plate segment 10 has been removed, the other grinding plate segments 11, 12 can also be removed relatively easily.

Mit dem erfindungsgemäßen Mahltellersegmentsystem sowie dem erfindungsgemäßen Verfahren ist es möglich, den Austausch von Mahltellersegmenten einer Mahlbahn einer Wälzmühle deutlich zu vereinfachen und in kürzerer Zeit durchzuführen.With the grinding table segment system according to the invention and the method according to the invention, it is possible to significantly simplify the replacement of grinding table segments of a grinding track of a roller mill and to carry it out in a shorter time.

Claims (13)

  1. Grinding pan segment system for a grinding track (5) of a grinding pan (4) of a roller mill having multiple grinding pan segments (12) each having an inner edge (42) and an outer edge (41), which are connected by two connection edges (43), wherein the length of the inner edge (42) is smaller than the length of the outer edge (41),
    having at least one exchangeable key grinding pan segment (10) for the grinding track (5) of the grinding pan (4) of the roller mill,
    wherein the grinding track (5) has an annular shape with an outer circumference and a smaller inner circumference around the center point,
    having an outer edge (31) and an inner edge (32) as well as two connection edges (33) connecting the outer and inner edges,
    wherein the length of the inner edge (32) positioned closer to the center point is greater than the length of the outer edge (31) positioned further away from the center point, and
    having at least one compensating grinding pan segment (11) which is arranged next to the key grinding pan segment (10),
    characterized in that
    the length of a circular arc formed by the key grinding pan segment (10) decreases as the radius from the inner edge (32) to the outer edge (31) increases, whereby the shape of the key grinding pan (10) segment is a shape similar to an inverted piece of cake.
  2. Grinding pan segment system (10) according to claim 1,
    characterized in that
    the outer edge (31) of the key grinding pan segment (10) forms a circular arc on the outer circumference and the inner edge (32) of the key grinding pan segment (10) forms a circular arc on the inner circumference.
  3. Grinding pan segment system according to claim 1 or 2,
    characterized in that
    a press recess (15) is provided on the outer edge (31) for placement of a pressing tool for a replacement process.
  4. Grinding pan segment system according to claim 3,
    characterized in that
    the press recess (15) is designed so that it can be covered by a retention rim component (26) during operation.
  5. Grinding pan segment system according to one of claims 1 to 4,
    characterized in that
    the grinding pan segments (12) are formed as standard grinding pan segments (12) of the same size and shape, and
    in that the key grinding pan segment (10) and the at least one compensating grinding pan segment (11) together form the shape of one or more standard grinding pan segments (12).
  6. Grinding pan segment system according to claim 5,
    characterized in that
    two compensating grinding pan segments (11) are provided in an arrangement to the left and right of the key grinding pan segment (10).
  7. Grinding pan segment system according to claim 6,
    characterized in that
    the two compensating grinding pan segments (11) are substantially mirror symmetrical with respect to an axis on the radius of the grinding track through the key grinding pan segment (10).
  8. Grinding pan segment system according to one of claims 5 to 7,
    characterized in that
    two compensating grinding pan segments (11) and one key grinding pan segment (10) have the size of one, two or three standard grinding pan segments (12).
  9. Grinding pan segment system according to one of claims 1 to 4,
    characterized in that
    the grinding pan segments (12) are formed as a compensating grinding pan segment (11), and
    in that a plurality of key grinding pan segments (10) are provided.
  10. Grinding pan segment system according to one of claims 1 to 4 or 9,
    characterized in that
    the same number of compensating grinding pan segments (11) and key grinding pan segments (10) are provided.
  11. Grinding pan segment system according to one of claims 1 to 10,
    characterized in that
    the key grinding pan segment (10), the compensating grinding pan segment (11) and/or the standard grinding pan segments (12) can be fastened on the grinding pan (4) by means of a single-part or multi-part clamping ring (20).
  12. Roller mill comprising a grinding pan (4),
    characterized in that
    the grinding pan (4) has a grinding pan segment system according to one of claims 1 to 11.
  13. Method for removing grinding pan segments (10, 11, 12) from a grinding pan (5) having a grinding pan segment system according to one of claims 1 to 11, further comprising a clamping ring (20) and a baffle ring (26),
    characterized in that
    the clamping ring (20) and the baffle ring (26) are removed,
    in that a pressing tool is attached to a press recess (15) of the key grinding pan segment (10),
    in that the key grinding pan segment (10) is pressed in the direction of the grinding pan center by means of the pressing tool, and
    in that the further grinding pan segments (11, 12) are subsequently removed.
EP20720400.9A 2020-04-16 2020-04-16 Milling track segment system and corresponding method Active EP4135901B1 (en)

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JP (1) JP7427807B2 (en)
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EP4135901A1 (en) 2023-02-22
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JP7427807B2 (en) 2024-02-05
BR112022020930A2 (en) 2022-12-27
WO2021209133A1 (en) 2021-10-21
MX2022012993A (en) 2022-12-08
ZA202211068B (en) 2023-05-31
AU2020442474B2 (en) 2024-02-15
AU2020442474A1 (en) 2022-11-03
CN115515716A (en) 2022-12-23
DK4135901T3 (en) 2024-08-19

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