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EP2999542B1 - Grinding roller - Google Patents

Grinding roller Download PDF

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Publication number
EP2999542B1
EP2999542B1 EP14808514.5A EP14808514A EP2999542B1 EP 2999542 B1 EP2999542 B1 EP 2999542B1 EP 14808514 A EP14808514 A EP 14808514A EP 2999542 B1 EP2999542 B1 EP 2999542B1
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EP
European Patent Office
Prior art keywords
roller
bearing
grinding
double
roller bearing
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Application number
EP14808514.5A
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German (de)
French (fr)
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EP2999542A1 (en
Inventor
Jörg BETTENWORTH
Thomas Letsch
Michael Keyssner
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Loesche GmbH
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Loesche GmbH
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Publication of EP2999542A1 publication Critical patent/EP2999542A1/en
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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
    • B02C15/004—Shape or construction of rollers or balls
    • 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
    • B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed
    • 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
    • B02C15/004—Shape or construction of rollers or balls
    • B02C15/005—Rollers or balls of composite construction
    • 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
    • B02C2015/008—Roller drive arrangements

Definitions

  • the invention relates to a grinding roller with an inclined, fixed inner roller axis, wherein a roll shell is provided on a roll body and a double-row roller bearing is arranged as a fixed bearing for supporting the rotatable roller body relative to the fixed inner roller shaft and a spaced-apart cylindrical roller bearing acts as a floating bearing.
  • Grinding rolls of this type are used above all in air-flow vertical mills for grinding cement raw material, cement, slags, ores or coal. Examples of such grinding rolls are from the DE 31 00 341 A1 . WO 2005/028112 A1 or US 2005/0023390 A1 known.
  • FIG. 2 A previous bearing arrangement of a corresponding grinding roller according to DE 3 815 218 A1 is in Fig. 2 represented in a simplified manner.
  • the inclined, fixed inner roller shaft 3 is positively and / or non-rotatably fixed in an approximately rectangular projecting therefrom opening portion of a rocker arm 14.
  • the main body 7 of the grinding roller 30 carries at its peripheral region in principle frusto-conical roller shell 6. The attachment between these parts is realized by means of clamping bolt 37.
  • the main body 7 of the grinding roller 30 is mounted in the region of the end face 9 with respect to the roll axis 3 by means of a double-row tapered roller bearing 31 with two rows 34, 35 of tapered rollers.
  • This bearing can be referred to as an inner fixed bearing, wherein the term “inner” as the center or the interior of the mill or the grinding plate 16 oriented bearing is understood.
  • the base body 7 is mounted and supported with the roll shell 6 by an outboard floating bearing 32, for example as a cylindrical roller bearing, relative to the roll axis 3.
  • an outboard floating bearing 32 for example as a cylindrical roller bearing
  • the grinding force required for comminuting the raw material results, as it were, from the weight of the grinding roller 30 and the hydraulic additional force, which is applied via a suspension system on the rocker arm 14 and thus on the roll shell 6.
  • the outwardly directed row of tapered rollers 35 is loaded in normal operation only with small radial forces. This extremely different radial load distribution shifts all the more if the resulting grinding force 50 does not engage the center of the roll shell 6, but rather in the direction of the larger grinding roll diameter, ie in the direction of the outer edge of the grinding path 17 or a storage rim 19.
  • this effect is similar to the effect of aquaplaning. In terms of storage, this effect can subsequently lead to a lubricating effect of the raceways to their destruction due to insufficient lubrication.
  • the invention is therefore an object of the invention to overcome the disadvantages and problems and to provide a grinding roller whose bearing assembly, taking into account a cost effective solution has a reduced susceptibility to wear.
  • An essential core idea of the invention can be seen to provide from the previous specification, a double-row roller bearing as a fixed bearing in the frontal, inner region of the grinding roller, since the supposedly significant forces acting on the roll shell forces can then be absorbed in the vicinity of the fixed bearing, and go to design the entire bearing arrangement of the grinding roller contrary.
  • the fixed bearing is arranged, so to speak, in the region of the roller base body or of the roller core offset axially outwards.
  • the hitherto very generously designed, designed as a cylindrical roller bearing floating bearing is laid in the frontal region of the roll axis, that is, provided at the shortest distance to the peripheral surface of the roll shell.
  • the inventive design of the bearing assembly of the grinding roller also makes it possible to dimension smaller in the frontal area now floating bearing smaller than that in the known storage outwardly offset, provided floating bearing so that achieved according to the invention at the same time to improve the quality of the storage of the grinding roller cost savings becomes.
  • the roll base body or roll core is advantageously supported in its outer region relative to the roll axis by a double-row tapered roller bearing.
  • This acting as a fixed bearing double-row tapered roller bearings therefore absorbs the radial and axial forces acting on the grinding roller forces.
  • the term “outer region” is understood to mean the region pointing outwards in the direction of the oscillating lever on the inclined axis of the grinding roller.
  • the "inward” region is an orientation toward the center of the grinding table or the center of a corresponding vertical mill in which the grinding roller is used.
  • the circumferential contour of the roll shell is due to the inclination of the axis of the grinding roller in the direction of the grinding plate and due to the largely horizontal Orientation of the grinding path of the grinding table, designed with a frustoconical peripheral contour. Due to this construction, a grinding gap with approximately the same distance over the radial extent is achieved between the grinding track and the grinding roller.
  • the fixed bearing is preferably designed as a double-row tapered roller bearing in the case of cement raw material, while a double-row spherical roller bearing is preferably used for the comminution of raw coal in vertical mills.
  • the double-row spherical roller bearing has the advantage that it withstands both axial and radial loads in the corresponding dimensioning range and is well suited for compensating for alignment errors.
  • the double-row tapered roller bearing can be loaded in a comparable manner both in the radial and in the axial direction very high.
  • the double row tapered roller bearing is mounted in X-arrangement as a bearing. Depending on the application but also an O-arrangement is possible.
  • the approximately frontally provided between the roll axis and roll core cylindrical roller bearing as a floating bearing can be relatively small dimensioned due to the inventive arrangement of the fixed bearing to the outer area, which can already be achieved a considerable cost savings.
  • this bearing designed in particular as a cylindrical roller bearing can be designed to be smaller and cheaper.
  • a grinding roller 1 according to the invention is shown in axial section with roller axis 3 and the articulation via a rocker arm 14.
  • a portion of a grinding plate 16 with Mahlbahnplatten 18, a storage edge 19 and a corresponding Mahlspalt 27 between the peripheral surface of the roll shell 6 and the surface of the Mahlbahnplatten 18 is shown in the lower part.
  • the peripheral surface of the roll shell 6 and its inclination 28 relative to the axis 4 of the grinding roller is designed such that the grinding gap 27 extends approximately parallel to the grinding table plane 26.
  • the roll axis 3 is in the outer area ( Fig. 1 , left) in a corresponding recess of the rocker arm 14 rigidly and rotationally fixed.
  • the roller body 7 or roll core is mounted with radially outwardly applied roll shell 6 by means of a fixed bearing 11 and a movable bearing 12 rotatably on the roll axis 3.
  • the fixed bearing 11 is in the example of Fig. 1 designed as a double-row tapered roller bearing 21 and applied in an "X" arrangement on the roll axis 3.
  • this fixed bearing 11 is placed in the outer region of the roller base body 7 which is oriented outwards relative to the oscillating lever 14, so that it is in contact with the lower one during operation Area of the grinding roller shell 6 acting forces can absorb for the most part.
  • the bearing 12 is designed as a cylindrical roller bearing 22 and smaller than a conventional bearing 32 in the prior art.
  • the bearing assembly of the grinding roller 1 according to the invention especially shows its outstanding advantages and overcoming the problems known in the art when the resulting force 50 in the grinding gap 27 from the central, theoretical assumption, radially outward (left) in Direction of the indicated storage area 19 shifts.
  • the fixed bearing 11 according to Fig. 1 shows its excellent effect, since most of the forces acting both radially and axially can be absorbed by this fixed bearing.
  • the invention therefore provides a bearing assembly in a grinding roller 1 according to the invention, in which the fixed bearing 11 is arranged and adapted to receive the essential forces, while the smaller sized floating bearing 12 has comparatively absorb only lower forces.
  • This solution also brings less wear of the corresponding bearing with it, so that larger maintenance intervals can be applied.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Rolling Contact Bearings (AREA)
  • Crushing And Grinding (AREA)
  • Accessories For Mixers (AREA)

Description

Die Erfindung betrifft eine Mahlwalze mit geneigter, feststehender innerer Walzenachse, wobei auf einem Walzengrundkörper ein Walzenmantel vorgesehen ist und zur Lagerung des drehbaren Walzengrundkörpers relativ zur feststehenden inneren Walzenachse ein doppelreihiges Rollenlager als Festlager angeordnet ist und ein davon beabstandetes Zylinderrollenlager als Loslager fungiert.The invention relates to a grinding roller with an inclined, fixed inner roller axis, wherein a roll shell is provided on a roll body and a double-row roller bearing is arranged as a fixed bearing for supporting the rotatable roller body relative to the fixed inner roller shaft and a spaced-apart cylindrical roller bearing acts as a floating bearing.

Mahlwalzen dieser Art werden vor allen Dingen in Luftstrom-Vertikalmühlen zur Mahlung von Zementrohmaterial, Zement, Schlacken, Erze oder Kohle eingesetzt. Beispiele derartiger Mahlwalzen sind aus der DE 31 00 341 A1 , WO 2005/028112 A1 oder US 2005/0023390 A1 bekannt.Grinding rolls of this type are used above all in air-flow vertical mills for grinding cement raw material, cement, slags, ores or coal. Examples of such grinding rolls are from the DE 31 00 341 A1 . WO 2005/028112 A1 or US 2005/0023390 A1 known.

Gerade in der US 2005/0023390 A1 oder auch der US 2010/0327094 A1 ist eine Lageranordnung für die Mahlwalze und deren Grundkörper beziehungsweise deren Walzenkern und dem darauf umfangsmäßig aufgebrachten Walzenmantel gezeigt.Especially in the US 2005/0023390 A1 or even the US 2010/0327094 A1 is a bearing assembly for the grinding roller and the base body or the roller core and the circumferentially applied roll shell shown.

Eine bisherige Lageranordnung einer entsprechenden Mahlwalze entsprechend der DE 3 815 218 A1 ist in Fig. 2 in vereinfachter Weise dargestellt.A previous bearing arrangement of a corresponding grinding roller according to DE 3 815 218 A1 is in Fig. 2 represented in a simplified manner.

Die geneigte, feststehende innere Walzenachse 3 ist in einem etwa rechtwinklig davon abstehenden Öffnungsbereich eines Schwinghebels 14 form- und/oder kraftschlüssig und drehfest befestigt.The inclined, fixed inner roller shaft 3 is positively and / or non-rotatably fixed in an approximately rectangular projecting therefrom opening portion of a rocker arm 14.

Zur Verdeutlichung der einwirkenden Kräfte auf den Walzenmantel 6 und die Mahlwalze 30 ist bruchstückartig ein Außenbereich eines Mahltellers 16 mit Mahlbahn 17 und diese bildenden Mahlbahnplatten 18 gezeigt.To illustrate the forces acting on the roll shell 6 and the grinding roller 30, an outer region of a grinding plate 16 with grinding track 17 and these forming Mahlbahnplatten 18 is shown fragmentary.

Der Grundkörper 7 der Mahlwalze 30 trägt an seinem Umfangsbereich den im Prinzip kegelstumpfförmig ausgebildeten Walzenmantel 6. Die Befestigung zwischen diesen Teilen ist mittels Spannbolzen 37 realisiert. Der Grundkörper 7 der Mahlwalze 30 ist im Bereich der Stirnseite 9 gegenüber der Walzenachse 3 mittels eines doppelreihigen Kegelrollenlagers 31 mit zwei Reihen 34, 35 von Kegelrollen gelagert. Dieses Lager kann als inneres Festlager bezeichnet werden, wobei der Begriff "inneres" als zur Mitte beziehungsweise dem Inneren der Mühle beziehungsweise zum Mahlteller 16 orientiertes Lager verstanden wird.The main body 7 of the grinding roller 30 carries at its peripheral region in principle frusto-conical roller shell 6. The attachment between these parts is realized by means of clamping bolt 37. The main body 7 of the grinding roller 30 is mounted in the region of the end face 9 with respect to the roll axis 3 by means of a double-row tapered roller bearing 31 with two rows 34, 35 of tapered rollers. This bearing can be referred to as an inner fixed bearing, wherein the term "inner" as the center or the interior of the mill or the grinding plate 16 oriented bearing is understood.

Nach außen, beabstandet zu diesem Festlager 31 ist der Grundkörper 7 mit dem Walzenmantel 6 durch ein außenliegendes Loslager 32, zum Beispiel als Zylinderrollenlager, gegenüber der Walzenachse 3 gelagert und abgestützt.Outwardly, spaced from this fixed bearing 31, the base body 7 is mounted and supported with the roll shell 6 by an outboard floating bearing 32, for example as a cylindrical roller bearing, relative to the roll axis 3.

Der Zerkleinerungs- beziehungsweise Mahlvorgang, der im Mahlspalt 27 zwischen der Umfangsfläche des Walzenmantels 6 und dem auf der Mahlbahn 17 im Betrieb vorhandenen Rohmaterial stattfindet, ist dem Fachmann auf diesem Gebiet hinreichend bekannt.The comminution or grinding process which takes place in the grinding gap 27 between the circumferential surface of the roll mantle 6 and the raw material present on the grinding path 17 during operation is sufficiently known to the person skilled in the art.

Aufgrund der nach innen geneigten Achse 4 der Mahlwalze 30 und der Neigung 28 des Walzenmantels 6 liegen sich am Mahlspalt 27 die Umfangsfläche des Walzenmantels 6 und die Mahlbahnplatten 18 mit geringem Abstand etwa parallel gegenüber.Due to the inwardly inclined axis 4 of the grinding roller 30 and the inclination 28 of the roll shell 6 are at the grinding gap 27, the peripheral surface of the roll shell 6 and the Mahlbahnplatten 18 at a small distance approximately parallel.

Die zur Zerkleinerung des Rohmaterials, wie Zementrohmaterial oder Kohle, erforderliche Mahlkraft resultiert sozusagen aus der Gewichtskraft der Mahlwalze 30 und der hydraulischen Zusatzkraft, die über ein Federungssystem auf den Schwinghebel 14 und damit auf den Walzenmantel 6 aufgebracht wird.The grinding force required for comminuting the raw material, such as cement raw material or coal, results, as it were, from the weight of the grinding roller 30 and the hydraulic additional force, which is applied via a suspension system on the rocker arm 14 and thus on the roll shell 6.

In der vereinfachten Darstellung in Fig. 2 sind die durch den Mahlprozess auf die Mahlwalze 30 einwirkenden Kräfte, etwa in der Mitte des Walzenmantels 6, mit Pfeilen dargestellt.In the simplified representation in Fig. 2 are the forces acting on the grinding roller 30 by the grinding process forces, approximately in the middle of the roll shell 6, shown by arrows.

Aufgrund der etwa um 15° geneigten Achse 4 der Mahlwalze 30 wirken die Radialkräfte etwa in Richtung des Pfeiles 49 und die Axialkräfte in Richtung des Pfeiles 48, so dass die resultierenden Kräfte vereinfacht in Richtung des Pfeiles 50 auf die Mahlwalze 30 und deren Lageranordnung einwirken.Due to the approximately 15 ° inclined axis 4 of the grinding roller 30, the radial forces act approximately in the direction of arrow 49 and the axial forces in the direction of arrow 48, so that the resulting forces act in a simplified manner in the direction of arrow 50 on the grinding roller 30 and the bearing assembly.

Die in Fig. 2 dargestellte Lageranordnung von Mahlwalzen 30 mit einem inneren Festlager und einen außenliegenden Loslager hat sich über viele Jahre in der Praxis bestens bewährt.In the Fig. 2 illustrated bearing assembly of grinding rollers 30 with an inner bearing and an external floating bearing has proven itself for many years in practice.

Aufgrund der Tendenz mit Vertikalmühlen und den darin eingesetzten Mahlwalzen immer höhere Durchsatzleistungen an gemahlenem und klassiertem Feingut zu erreichen, wurden auch zunehmend größere Mahlwalzen eingesetzt. Hierbei stellten sich im Betrieb immer häufiger Probleme und ein höherer Verschleiß mit der bis dahin realisierten Lagerordnung mit innerem Festlager und außenliegendem Loslager ein.Due to the tendency with vertical mills and the grinding rollers used therein To achieve ever higher throughputs of ground and classified fines, increasingly larger grinding rolls were used. Here, in operation, more and more problems and higher wear with the hitherto realized bearing arrangement with inner fixed bearing and outboard movable bearing a set.

Nachteilig ist hierbei, dass die schematisch eingezeichneten einwirkenden Kräfte die beiden Reihen des Festlagers 31 mit den Kegelrollen 34, 35 unterschiedlich belasten. Dies deshalb, da nur die innere, das heißt die zur Mühlenmitte zeigende Reihe der Kegelrollen 34, die nach außen wirkenden Axialkräfte und aufgrund der Neigung der Achse 4 auch den größten Teil der Radialkräfte aufnimmt.The disadvantage here is that the schematically drawn acting forces load the two rows of the fixed bearing 31 with the tapered rollers 34, 35 differently. This is because only the inner, that is, the mill center pointing row of tapered rollers 34, the outward-acting axial forces and due to the inclination of the axis 4 also absorbs most of the radial forces.

Die nach außen gerichtete Reihe der Kegelrollen 35 wird im Normalbetrieb nur mit geringen Radialkräften belastet. Diese extrem unterschiedliche radiale Lastverteilung verschiebt sich umso mehr, wenn die resultierende Mahlkraft 50 nicht mittig am Walzenmantel 6 angreift, sondern mehr in Richtung des größeren Mahlwalzendurchmessers, also in Richtung des Außenrandes der Mahlbahn 17 beziehungsweise eines Staurandes 19.The outwardly directed row of tapered rollers 35 is loaded in normal operation only with small radial forces. This extremely different radial load distribution shifts all the more if the resulting grinding force 50 does not engage the center of the roll shell 6, but rather in the direction of the larger grinding roll diameter, ie in the direction of the outer edge of the grinding path 17 or a storage rim 19.

Die Annahme einer "mittigen" Krafteinwirkung dient lediglich der Vereinfachung für theoretische Berechnungen.The assumption of a "central" force only serves to simplify theoretical calculations.

Wie auch Untersuchungen und Verschleißbilder der Mahlteile zeigten, reduziert sich mit einer Verschiebung der resultierenden Kraft 50 nach außen auch die auf die Kegelrollen 35 der äußeren Reihe einwirkenden Radialkräfte immer weiter.As investigations and wear patterns of the grinding parts showed, with a displacement of the resulting force 50 outwards, the radial forces acting on the tapered rollers 35 of the outer row are also reduced further and further.

Dies kann in bestimmten Anwendungsfällen dazu führen, dass diese äußere Reihe der Kegelrollen 35 nahezu vollständig entlastet wird und die einzelnen Kegelrollen als Wälzkörper nicht mehr abrollen, sondern aufgrund mangelnder Reibung im Lager auf den Laufflächen gleiten. Dieser Effekt ist etwa mit dem Effekt des "Aquaplaning" vergleichbar. Lagerungsmäßig kann dieser Effekt in der Folge zu einem Anschmiereffekt der Laufbahnen bis hin zu deren Zerstörung aufgrund von unzureichender Schmierung führen.This can lead to certain applications that this outer row of tapered rollers 35 is almost completely relieved and no longer roll the individual tapered rollers as rolling elements, but slide due to lack of friction in the bearing on the treads. This effect is similar to the effect of aquaplaning. In terms of storage, this effect can subsequently lead to a lubricating effect of the raceways to their destruction due to insufficient lubrication.

Der Erfindung liegt daher die Aufgabe zugrunde, die aufgezeigten Nachteile und Probleme zu überwinden und eine Mahlwalze zu schaffen, deren Lageranordnung unter Berücksichtigung einer kostengünstigen Lösung eine verringerte Verschleißanfälligkeit aufweist.The invention is therefore an object of the invention to overcome the disadvantages and problems and to provide a grinding roller whose bearing assembly, taking into account a cost effective solution has a reduced susceptibility to wear.

Diese Aufgabe wird gemäß der Erfindung durch die Merkmale des Anspruchs 1 gelöst.This object is achieved according to the invention by the features of claim 1.

Ein wesentlicher Kerngedanke der Erfindung kann darin gesehen werden, von der bisherigen Vorgabe, ein doppelreihiges Rollenlager als Festlager im stirnseitigen, inneren Bereich der Mahlwalze, vorzusehen, da die vermeintlich wesentlichen auf den Walzenmantel wirkenden Kräfte dann im Nahbereich zum Festlager aufgenommen werden können, abzugehen und die gesamte Lageranordnung der Mahlwalze konträr zu konzipieren. Bei diesem konträren Lagerungsprinzip wird das Festlager sozusagen im Bereich des Walzengrundkörpers beziehungsweise des Walzenkerns nach axial außen versetzt angeordnet. Gleichzeitig wird das bisher sehr großzügig konzipierte, als Zylinderrollenlager ausgelegte Loslager, in den stirnseitigen Bereich der Walzenachse verlegt, das bedeutet, in kürzestem Abstand zur Umfangsfläche des Walzenmantels vorgesehen.An essential core idea of the invention can be seen to provide from the previous specification, a double-row roller bearing as a fixed bearing in the frontal, inner region of the grinding roller, since the supposedly significant forces acting on the roll shell forces can then be absorbed in the vicinity of the fixed bearing, and go to design the entire bearing arrangement of the grinding roller contrary. In this contrary storage principle, the fixed bearing is arranged, so to speak, in the region of the roller base body or of the roller core offset axially outwards. At the same time, the hitherto very generously designed, designed as a cylindrical roller bearing floating bearing is laid in the frontal region of the roll axis, that is, provided at the shortest distance to the peripheral surface of the roll shell.

Die erfindungsgemäße Auslegung der Lageranordnung der Mahlwalze gestattet es auch, das im stirnseitigen Bereich nunmehr vorgesehene Loslager kleiner zu dimensionieren als das in der bekannten Lagerung nach außen versetzte, vorgesehene Loslager, so dass gemäß der Erfindung gleichzeitig zur qualitativen Verbesserung der Lagerung der Mahlwalze eine Kostenersparnis erreicht wird.The inventive design of the bearing assembly of the grinding roller also makes it possible to dimension smaller in the frontal area now floating bearing smaller than that in the known storage outwardly offset, provided floating bearing so that achieved according to the invention at the same time to improve the quality of the storage of the grinding roller cost savings becomes.

Der Walzengrundkörper beziehungsweis Walzenkern wird dementsprechend erfindungsgemäß in seinem äußeren Bereich gegenüber der Walzenachse in vorteilhafter Weise durch ein doppelreihiges Kegelrollenlager abgestützt. Dieses als Festlager fungierende doppelreihige Kegelrollenlager nimmt daher die radialen und axialen auf die Mahlwalze einwirkenden Kräfte auf.Accordingly, according to the invention, the roll base body or roll core is advantageously supported in its outer region relative to the roll axis by a double-row tapered roller bearing. This acting as a fixed bearing double-row tapered roller bearings therefore absorbs the radial and axial forces acting on the grinding roller forces.

Mit der Bezeichnung "äußerer Bereich" wird im Rahmen dieser Anmeldung der auf der geneigten Achse der Mahlwalze nach außen in Richtung des Schwinghebels weisende Bereich verstanden. Im Gegensatz dazu steht der nach "innen" gerichtete Bereich für eine Orientierung in Richtung der Mitte des Mahltellers beziehungsweise der Mitte einer entsprechenden Vertikalmühle, in der die Mahlwalze eingesetzt wird.In the context of this application, the term "outer region" is understood to mean the region pointing outwards in the direction of the oscillating lever on the inclined axis of the grinding roller. In contrast, the "inward" region is an orientation toward the center of the grinding table or the center of a corresponding vertical mill in which the grinding roller is used.

Die Umfangskontur des Walzenmantels wird aufgrund der Neigung der Achse der Mahlwalze in Richtung des Mahltellers und aufgrund der weitestgehend waagrechten Orientierung der Mahlbahn des Mahltellers, mit einer kegelstumpfartigen Umfangskontur ausgelegt. Aufgrund dieser Konstruktion wird zwischen Mahlbahn und Mahlwalze ein Mahlspalt mit etwa gleichem Abstand über die radiale Erstreckung erreicht.The circumferential contour of the roll shell is due to the inclination of the axis of the grinding roller in the direction of the grinding plate and due to the largely horizontal Orientation of the grinding path of the grinding table, designed with a frustoconical peripheral contour. Due to this construction, a grinding gap with approximately the same distance over the radial extent is achieved between the grinding track and the grinding roller.

Abhängig von dem zu zerkleinerndem Rohmaterial wird bevorzugter Weise das Festlager bei Zementrohmaterial als doppelreihiges Kegelrollenlager ausgelegt, während für die Zerkleinerung von Rohkohle in Vertikalmühlen ein doppelreihiges Pendelrollenlager bevorzugt eingesetzt wird.Depending on the raw material to be comminuted, the fixed bearing is preferably designed as a double-row tapered roller bearing in the case of cement raw material, while a double-row spherical roller bearing is preferably used for the comminution of raw coal in vertical mills.

Das zweireihige Pendelrollenlager hat den Vorteil, dass es sowohl axial als auch radialen Belastungen im entsprechenden Dimensionierungsbereich standhält und sich gut dafür eignet, Fluchtfehler auszugleichen.The double-row spherical roller bearing has the advantage that it withstands both axial and radial loads in the corresponding dimensioning range and is well suited for compensating for alignment errors.

Das zweireihige Kegelrollenlager ist in vergleichbarer Weise sowohl in radialer als auch in axialer Richtung sehr hoch belastbar. In bevorzugter Weise wird das zweireihige Kegelrollenlager in X-Anordnung als Lager montiert. Abhängig vom Anwendungsfall ist aber auch eine O-Anordnung möglich.The double-row tapered roller bearing can be loaded in a comparable manner both in the radial and in the axial direction very high. Preferably, the double row tapered roller bearing is mounted in X-arrangement as a bearing. Depending on the application but also an O-arrangement is possible.

Das etwa stirnseitig zwischen Walzenachse und Walzenkern vorgesehene Zylinderrollenlager als Loslager kann aufgrund der erfindungsgemäßen Anordnung des Festlagers zum äußeren Bereich hin, relativ klein dimensioniert werden, wodurch bereits eine beträchtliche Kosteneinsparung erzielt werden kann.The approximately frontally provided between the roll axis and roll core cylindrical roller bearing as a floating bearing can be relatively small dimensioned due to the inventive arrangement of the fixed bearing to the outer area, which can already be achieved a considerable cost savings.

Bei der erfindungsgemäßen Anordnung von Festlager und Loslager wird daher eine veränderte Lastverteilung zwischen den beiden Lagern und eine erhöhte Last am Festlager aufgrund der Neigung der Achse der Mahlwalze sowie des Angriffspunktes und der Kraftrichtung der resultierenden Mahlkraft erreicht, was speziell dann vorteilhaft ist, wenn die resultierende Mahlkraft am Walzenmantel weiter außen, das heißt näher am Staurand des Mahltellers angreift.In the inventive arrangement of fixed bearing and floating bearing therefore a changed load distribution between the two bearings and an increased load on the fixed bearing due to the inclination of the axis of the grinding roller and the point of application and the direction of force of the resulting grinding force is achieved, which is particularly advantageous if the resulting Grinding force on the roll shell further out, that is closer to the storage area of the grinding plate attacks.

Auf diese Weise wird eine Entlastung einer der beiden Rollenlager des doppelreihigen Kegelrollenlagers vermieden, so dass die vorausgehend angesprochenen Probleme und Schäden am Lager verhindert werden können.In this way, a discharge of one of the two roller bearings of the double-row tapered roller bearing is avoided, so that the above-mentioned problems and damage to the bearing can be prevented.

Da am Loslager die zu übertragende Kraft geringer ausfällt, kann dieses insbesondere als Zylinderrollenlager ausgelegte Lager kleiner und kostengünstiger konzipiert werden.Since the force to be transmitted at the non-locating bearing is lower, this bearing designed in particular as a cylindrical roller bearing can be designed to be smaller and cheaper.

Nachfolgend wird der Anmeldungsgegenstand anhand schematischer Darstellungen noch näher erläutert. Es zeigen:

Fig. 1
einen Axialschnitt durch eine erfindungsgemäße Mahlwalze mit entsprechender Lageranordnung mit Bezug auf einen bruchstückartig im unteren Bereich dargestellten Mahlteller; und
Fig. 2
einen vergleichbaren Axialschnitt durch eine herkömmliche Mahlwalze mit entsprechender Lageranordnung einschließlich einem Randbereich eines Mahltellers.
In the following, the subject of the application will be explained in more detail with reference to schematic illustrations. Show it:
Fig. 1
an axial section through a grinding roller according to the invention with a corresponding bearing arrangement with respect to a fragmentary grinding table in the lower area shown grinding table; and
Fig. 2
a comparable axial section through a conventional grinding roller with a corresponding bearing arrangement including an edge region of a grinding plate.

In Fig. 1 ist eine erfindungsgemäße Mahlwalze 1 im Axialschnitt mit Walzenachse 3 und der Anlenkung über einen Schwinghebel 14 dargestellt. Im Hinblick auf die Mahl- und Zerkleinerungsfunktion von Rohmaterial ist im unteren Bereich bruchstückartig ein Teil eines Mahltellers 16 mit Mahlbahnplatten 18, einem Staurand 19 und einem entsprechenden Mahlspalt 27 zwischen der Umfangsfläche des Walzenmantels 6 und der Oberfläche der Mahlbahnplatten 18 gezeigt.In Fig. 1 a grinding roller 1 according to the invention is shown in axial section with roller axis 3 and the articulation via a rocker arm 14. With regard to the grinding and crushing function of raw material, a portion of a grinding plate 16 with Mahlbahnplatten 18, a storage edge 19 and a corresponding Mahlspalt 27 between the peripheral surface of the roll shell 6 and the surface of the Mahlbahnplatten 18 is shown in the lower part.

Die Umfangsfläche des Walzenmantels 6 und dessen Neigung 28 gegenüber der Achse 4 der Mahlwalze ist derart ausgelegt, dass der Mahlspalt 27 etwa parallel zur Mahltellerebene 26 verläuft.The peripheral surface of the roll shell 6 and its inclination 28 relative to the axis 4 of the grinding roller is designed such that the grinding gap 27 extends approximately parallel to the grinding table plane 26.

Erwähnt sei, dass gleiche Bezugszeichen in Fig. 1 wie in Fig. 2 gleiche oder gleichartige Baugruppen einer entsprechenden Mahlwalze zeigen.It should be noted that the same reference numerals in Fig. 1 as in Fig. 2 show the same or similar assemblies of a corresponding grinding roller.

Die Walzenachse 3 ist im äußeren Bereich (Fig. 1, links) in einer entsprechenden Ausnehmung des Schwinghebels 14 starr und drehfest festgelegt.The roll axis 3 is in the outer area ( Fig. 1 , left) in a corresponding recess of the rocker arm 14 rigidly and rotationally fixed.

Im nach innen weisenden Bereich, der etwa zur Mitte des Mahltellers 16 weist, ist der Walzengrundkörper 7 beziehungsweise Walzenkern mit radial außen aufgebrachtem Walzenmantel 6 mittels eines Festlagers 11 und eines Loslagers 12 rotativ auf der Walzenachse 3 gelagert.In the inward-facing region, which points approximately to the center of the grinding table 16, the roller body 7 or roll core is mounted with radially outwardly applied roll shell 6 by means of a fixed bearing 11 and a movable bearing 12 rotatably on the roll axis 3.

Das Festlager 11 ist im Beispiel der Fig. 1 als zweireihiges Kegelrollenlager 21 ausgelegt und in einer "X"-Anordnung auf der Walzenachse 3 aufgebracht. Dieses Festlager 11 ist im Beispiel im äußeren, nach außen zum Schwinghebel 14 orientierten Bereich des Walzengrundkörpers 7 platziert, so dass es die im Betrieb auf den unte- ren Bereich des Mahlwalzenmantels 6 einwirkenden Kräfte zum größten Teil aufnehmen kann.The fixed bearing 11 is in the example of Fig. 1 designed as a double-row tapered roller bearing 21 and applied in an "X" arrangement on the roll axis 3. In the example, this fixed bearing 11 is placed in the outer region of the roller base body 7 which is oriented outwards relative to the oscillating lever 14, so that it is in contact with the lower one during operation Area of the grinding roller shell 6 acting forces can absorb for the most part.

Das im stirnseitigen Bereich 9 des Walzengrundkörpers 7 beziehungsweise der Mahlwalze 1 auf der Walzenachse 3 vorgesehene Loslager 12 nimmt daher bei der erfindungsgemäßen Lageranordnung nur relativ geringe, einwirkende Kräfte auf. Aus diesem Grund kann dieses Loslager 12 auch kleiner dimensioniert werden als bisher im Stand der Technik verwendete Loslager 32.The provided in the frontal region 9 of the roller body 7 and the grinding roller 1 on the roller shaft 3 floating bearing 12 therefore takes in the bearing assembly according to the invention only relatively small, acting forces. For this reason, this floating bearing 12 can be dimensioned smaller than previously used in the art floating bearing 32nd

Im Beispiel nach Fig. 1 ist das Lager 12 als Zylinderrollenlager 22 und kleiner konzipiert als ein herkömmliches Lager 32 im Stand der Technik.In the example below Fig. 1 For example, the bearing 12 is designed as a cylindrical roller bearing 22 and smaller than a conventional bearing 32 in the prior art.

Die Lageranordnung der erfindungsgemäßen Mahlwalze 1 zeigt speziell dann ihre herausragenden Vorteile und die Überwindung der Probleme, wie sie im Stand der Technik bekannt sind, wenn sich die resultierende Krafteinwirkung 50 im Mahlspalt 27 von der mittigen, theoretischen Annahme, nach radial außen (links) in Richtung des angedeuteten Staurandes 19 verschiebt. Insbesondere dann zeigt das Festlager 11 gemäß Fig. 1 seine hervorragende Wirkung, da der größte Teil der sowohl radial wie axial einwirkenden Kräfte von diesem Festlager aufgenommen werden kann.The bearing assembly of the grinding roller 1 according to the invention especially shows its outstanding advantages and overcoming the problems known in the art when the resulting force 50 in the grinding gap 27 from the central, theoretical assumption, radially outward (left) in Direction of the indicated storage area 19 shifts. In particular, then shows the fixed bearing 11 according to Fig. 1 its excellent effect, since most of the forces acting both radially and axially can be absorbed by this fixed bearing.

Die Erfindung schafft daher eine Lageranordnung in einer erfindungsgemäßen Mahlwalze 1, bei der das Festlager 11 zur Aufnahme der wesentlichen Kräfte angeordnet und ausgelegt ist, während das kleiner dimensionierte Loslager 12 vergleichsweise nur geringere Kräfte aufzunehmen hat. Diese Lösung bringt auch einen geringeren Verschleiß der entsprechenden Lager mit sich, so dass größere Wartungsintervalle angesetzt werden können.The invention therefore provides a bearing assembly in a grinding roller 1 according to the invention, in which the fixed bearing 11 is arranged and adapted to receive the essential forces, while the smaller sized floating bearing 12 has comparatively absorb only lower forces. This solution also brings less wear of the corresponding bearing with it, so that larger maintenance intervals can be applied.

Claims (6)

  1. Grinding roller,
    with inclined, stationary inner roller shaft (3),
    with roller jacket (6) provided on a roller base body (7),
    with a double-row roller bearing (21) arranged relative to the stationary inner roller shaft (3) for bearing of the rotatable roller base body (7) and a cylindrical roller bearing (22) spaced apart therefrom,
    characterised in that
    the cylindrical roller bearing (22) is provided in the end-face region of the roller shaft (3) for bearing the roller base body (7) with roller jacket (6) rotationally with respect to the stationary roller shaft (3), and
    the double-row roller bearing (21) is arranged axial-outwardly offset to the spaced apart cylindrical roller bearing (22), that is provided in the end-face region of the roller shaft (3), in the region of the roller base body (7) on the roller shaft (3).
  2. Grinding roller according to claim 1,
    characterised in that
    the roller jacket (6) applied on the roller base body (7) has a frusto-conical-type peripheral contour.
  3. Grinding roller according to claim 1 or 2,
    characterised in that
    the double-row roller bearing is designed as a tapered roller bearing (21) or as a pendulum roller bearing.
  4. Grinding roller according to one of claims 1 to 3,
    characterised in that
    the double-row tapered roller bearing (21) is designed as a reciprocally inclined roller bearing.
  5. Grinding roller according to one of claims 1 to 4,
    characterised in that
    the end-face cylindrical roller bearing (22), with the same roller dimensions, can be designed to be smaller in terms of dimensions than an outer cylindrical roller bearing used to date.
  6. Grinding roller according to one of claims 1 to 5,
    characterised in that
    the double-row tapered roller bearing (21) is provided in "X"-arrangement or in "O"-arrangement.
EP14808514.5A 2014-10-31 2014-10-31 Grinding roller Active EP2999542B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/073477 WO2015144259A1 (en) 2014-10-31 2014-10-31 Grinding roller

Publications (2)

Publication Number Publication Date
EP2999542A1 EP2999542A1 (en) 2016-03-30
EP2999542B1 true EP2999542B1 (en) 2017-08-09

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US (1) US20160121335A1 (en)
EP (1) EP2999542B1 (en)
JP (1) JP6413025B2 (en)
CN (1) CN105764613A (en)
DK (1) DK2999542T3 (en)
WO (1) WO2015144259A1 (en)

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CN110090697B (en) * 2019-06-11 2024-04-19 中材（天津）粉体技术装备有限公司 New configuration structure of grinding roller bearing

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Also Published As

Publication number Publication date
JP2017534454A (en) 2017-11-24
CN105764613A (en) 2016-07-13
US20160121335A1 (en) 2016-05-05
EP2999542A1 (en) 2016-03-30
JP6413025B2 (en) 2018-10-24
WO2015144259A1 (en) 2015-10-01
DK2999542T3 (en) 2017-11-13

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