EP3256640A1 - Refiner plate - Google Patents

Refiner plate

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Publication number
EP3256640A1
EP3256640A1 EP15808576.1A EP15808576A EP3256640A1 EP 3256640 A1 EP3256640 A1 EP 3256640A1 EP 15808576 A EP15808576 A EP 15808576A EP 3256640 A1 EP3256640 A1 EP 3256640A1
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EP
European Patent Office
Prior art keywords
grinding
mahlleisten
division
arrangement according
bars
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15808576.1A
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German (de)
French (fr)
Other versions
EP3256640B1 (en
Inventor
Martin Schmid
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
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Voith Patent GmbH
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP3256640A1 publication Critical patent/EP3256640A1/en
Application granted granted Critical
Publication of EP3256640B1 publication Critical patent/EP3256640B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D21D1/306—Discs

Definitions

  • the invention relates to a grinding arrangement for grinding of water-suspended pulp fibers between two Mahlspalt forming and relatively rotating grinding surfaces, which are formed by Mahlleisten and intervening grooves, wherein the Mahlleisten extend at least with the essential direction component radially with respect to the axis of rotation.
  • pulp fibers i. To mill fresh pulp and / or waste paper fibers in order to achieve the desired properties, in particular in terms of strength, formation and surface in the fibrous web produced therefrom.
  • the refining surfaces used for this purpose because of the relatively rapid wear of the grinding surfaces, are formed by interchangeable grinding sets bolted to the corresponding support surface.
  • the grinding sets must be optimally adapted to the pulp to be treated, also to prevent excessive wear of the sets.
  • the object of the invention is therefore to improve the efficiency of the fiber treatment.
  • this object is achieved in that the distance of the radially inner end of all Mahlleisten at least one grinding surface of the axis of rotation by a maximum of 10%, based on the radial maximum length of the grinding bars, with each other and share some of the Mahlleisten radially outward.
  • this allows a full utilization of the grinding surface and on the other hand, the divisions of Mahlleisten generate turbulence in the suspension to be treated, which improves the entry of the fibers into the treatment gap or between the Mahlleisten.
  • additional turbulence in the suspension can be generated solely by the fact that the radially inner end of all Mahlleisten at least one grinding surface is different distances from the axis of rotation. Again, the turbulence support the collection of the suspension to be treated between the grinding bars.
  • mill strips alternate in the circumferential direction at a short distance and at a long distance from the axis of rotation.
  • the division takes place at least some Mahlleisten at least one grinding surface with a different distance from the axis of rotation. This can emanating from the divisions of Mahlleisten Inhomogeneities are extended to the largest possible radial region, which counteracts uneven wear. It is particularly advantageous if the distance of the pitch to the axis of rotation in the circumferential direction of the grinding surface continuously increases or decreases.
  • the distance between the dividing grinding bars should increase steadily radially outward in a division section following the division.
  • the opening gap between the grinding bars increases the cutting edge length, which has a correspondingly positive effect on the treatment.
  • the dividing section extends over a length between 10 and 50 mm.
  • the grinding bars In order to produce as constant as possible a cutting angle of the grinding bars, the grinding bars should extend as far as possible parallel outside the dividing sections. For this purpose, it is helpful if at least one of the divided grinding bars is curved after a division section following the division.
  • Mahlleisten To create gradual transitions in the distribution of Mahlleisten, it is advantageous if some, preferably all Mahlleisten share in two grinding bars.
  • FIG. 1 shows a schematic cross section through a grinding arrangement
  • Figure 2 a grinding plate
  • FIG. 3 shows a section according to FIG. 2 and FIG.
  • Figure 4 another grinding plate.
  • a grinding gap 1 is formed by a fixed grinding surface 2 coupled to the housing and a grinding surface 3 rotating about a rotation axis 6.
  • the rotating grinding surface 3 is here moved by a rotatably mounted in the housing shaft 7 in the direction of rotation.
  • This shaft 7 is driven by a drive also provided in the housing.
  • the fiber suspension S to be ground passes through an inlet through the center into the grinding gap 1 between the two grinding surfaces 2, 3.
  • the fiber suspension S passes through the cooperating grinding surfaces 2,3 radially outward and leaves the adjoining annular space through a drain.
  • Both grinding surfaces 2, 3 are each formed by a plurality of refining plates, as shown in FIGS. 2 and 4, which extend over in each case one circumferential segment of the corresponding refining surface 2, 3.
  • the refining plates yield a continuous grinding surface 2, 3.
  • the refining plates and thus also the grinding surfaces 2, 3 are formed, as shown in FIGS. 2 to 4, by a multiplicity of essentially radially extending grinding bars 4 and grooves 5 located therebetween.
  • Mahlleisten 4 also called knife
  • Mahlleisten 4 is generally rectangular, but there are other forms.
  • the grooves 5 extending between the milling strips 4 likewise have a rectangular cross-section and serve as flow channels for the fiber suspension S.
  • the groove depth is usually between 2 and 20 mm.
  • Essential to the invention here is that the distance between the radially inner end of all grinding bars 4 both grinding surfaces of the rotation axis 6 by a maximum of 10%, based on the radial maximum length of the grinding bars 4, with each other. Disregarded here are interruptions of Mahlleisten 4, as required in the segmentation of the grinding surface in refining plates or holes 8 for the attachment of the refining plates.
  • the distance between the graduation and the axis of rotation 6 increases continuously in small increments in the circumferential direction of the grinding surface, so that the circumferentially adjacent divisions run in a spiral.
  • the length of the dividing section 9 is between 10 and 50 mm.
  • all the grinding bars 4 can each split into two grinding bars 4.
  • FIG. 4 also shows the possibility that a grinding bar 4 divides radially one after the other several times into two grinding bars 4 in each case.
  • the grinding bars 4 run parallel outside the dividing sections 9, wherein in particular the non-dividing grinding bars 4 according to FIG. 4 can have one or more bends.
  • the width of all grinding bars 4 outside the, following a division following division sections 9 is the same size.
  • the width of the grooves 5 between the grinding bars 4 outside the, following a division following division sections 9 is the same size.
  • milling strips 4 alternate here in the circumferential direction with a short distance and with a long distance to the axis of rotation 6.

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  • Crushing And Grinding (AREA)
  • Paper (AREA)
  • Crushing And Pulverization Processes (AREA)

Abstract

The invention relates to a refining assembly for refining aqueously suspended pulp fibers between two refining surfaces (2, 3), which form a refining gap (1) and rotate in relation to each other and are formed by refining bars (4) and grooves (5) extending therebetween, wherein the refining bars (4) extend radially with respect to the axis of rotation (6) at least by means of the essential direction component. The efficiency should be improved in that the distance of the radially inner end of all refining bars (4) of at least one refining surface from the axis of rotation (6) differs among said refining bars by at most 10%, with respect to the radial maximum length of the refining bars (4), and some of the refining bars (4) split radially outward.

Description

Mahlgarnitur  grinding set
Die Erfindung betrifft eine Mahlanordnung zur Mahlung von wässrig suspendierten Zellstofffasern zwischen zwei, einen Mahlspalt bildenden und relativ zueinander rotierenden Mahlflächen, die von Mahlleisten und dazwischen verlaufenden Nuten gebildet werden, wobei sich die Mahlleisten zumindest mit der wesentlichen Richtungskomponente radial bezüglich der Rotationsachse erstrecken. The invention relates to a grinding arrangement for grinding of water-suspended pulp fibers between two Mahlspalt forming and relatively rotating grinding surfaces, which are formed by Mahlleisten and intervening grooves, wherein the Mahlleisten extend at least with the essential direction component radially with respect to the axis of rotation.
Es ist seit langem bekannt, Zellstofffasern, d.h. Frischzellstoff und/oder Altpapierfasern zu mahlen, um bei der daraus hergestellten Faserstoffbahn die gewünschten Eigenschaften, insbesondere hinsichtlich Festigkeit, Formation und Oberfläche erreichen zu können. It has long been known to use pulp fibers, i. To mill fresh pulp and / or waste paper fibers in order to achieve the desired properties, in particular in terms of strength, formation and surface in the fibrous web produced therefrom.
Bei den dabei zum Einsatz kommenden Refinern werden die Mahlflächen wegen des relativ schnellen Verschleißes von auswechselbaren, mit der entsprechenden Stützfläche verschraubten Mahlgarnituren gebildet. The refining surfaces used for this purpose, because of the relatively rapid wear of the grinding surfaces, are formed by interchangeable grinding sets bolted to the corresponding support surface.
Für das Erreichen der gewünschten Fasereigenschaften, insbesondere den Mahlgrad müssen die Mahlgarnituren dem zu behandelnden Faserstoff bestmöglich angepasst werden, auch um einen übermäßigen Verschleiß der Garnituren zu verhindern.  To achieve the desired fiber properties, in particular the freeness, the grinding sets must be optimally adapted to the pulp to be treated, also to prevent excessive wear of the sets.
Außerdem wird zur Effizienzsteigerung der Faserbehandlung eine optimale Nutzung der verfügbaren Mahlfläche angestrebt. In addition, to optimize the efficiency of the fiber treatment, an optimal use of the available grinding surface is sought.
Die Aufgabe der Erfindung ist es daher die Effizienz der Faserbehandlung zu verbessern. The object of the invention is therefore to improve the efficiency of the fiber treatment.
Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass sich die Entfernung des radial inneren Endes aller Mahlleisten wenigstens jeweils einer Mahlfläche von der Rotationsachse um maximal 10%, bezogen auf die radiale Maximallänge der Mahlleisten, untereinander unterscheidet und sich einige der Mahlleisten radial nach außen teilen. Einerseits ermöglicht dies eine umfassende Ausnutzung der Mahlfläche und andererseits erzeugen die Teilungen der Mahlleisten Turbulenzen in der zu behandelnden Suspension, was den Einzug der Fasern in den Behandlungsspalt bzw. zwischen die Mahlleisten verbessert. According to the invention, this object is achieved in that the distance of the radially inner end of all Mahlleisten at least one grinding surface of the axis of rotation by a maximum of 10%, based on the radial maximum length of the grinding bars, with each other and share some of the Mahlleisten radially outward. On the one hand, this allows a full utilization of the grinding surface and on the other hand, the divisions of Mahlleisten generate turbulence in the suspension to be treated, which improves the entry of the fibers into the treatment gap or between the Mahlleisten.
Da dieses Design in Strömungsrichtung keine Verengungen aufweist, verringert sich auch die Verstopfungsgefahr. Dementsprechend kann die Spaltbreite zwischen den Mahlleisten zur weiteren Effizienzsteigerung vermindert werden. Since this design has no restrictions in the direction of flow, the risk of clogging also decreases. Accordingly, the gap width between the grinding bars can be reduced for further increase in efficiency.
Hierbei werden Unterbrechungen der Mahlleisten infolge von Bohrungen in der Mahlgarnitur, wie sie zu Befestigungszwecken erforderlich sind, und infolge Segmentierung der Mahlfläche nicht berücksichtigt. Dies bedeutet, dass wir diese Mahlleisten bei der Erfindungsbeschreibung wegen ihrer geringen Relevanz für die Erfindung als durchgehend betrachten. Eine umfassende Ausnutzung der Mahlfläche ergibt sich, wenn das radial innere Ende aller Mahlleisten wenigstens einer Mahlfläche gleichweit von der Rotationsachse entfernt ist. In this case, interruptions of the Mahlleisten due to holes in the grinding set, as they are required for mounting purposes, and due to segmentation of the grinding surface are not taken into account. This means that we consider these mill bars in the description of the invention because of their low relevance to the invention as a continuous. A comprehensive utilization of the grinding surface results when the radially inner end of all grinding bars at least one grinding surface is equidistant from the axis of rotation.
Allerdings lassen sich zusätzliche Turbulenzen in der Suspension allein dadurch erzeugen, dass das radial innere Ende aller Mahlleisten wenigstens einer Mahlfläche unterschiedlich weit von der Rotationsachse entfernt ist. Auch hier können die Turbulenzen den Einzug der zu behandelnden Suspension zwischen die Mahlleisten unterstützen.  However, additional turbulence in the suspension can be generated solely by the fact that the radially inner end of all Mahlleisten at least one grinding surface is different distances from the axis of rotation. Again, the turbulence support the collection of the suspension to be treated between the grinding bars.
Um dies umfassend zu nutzen, ist es vorteilhaft, wenn sich in Umfangsrichtung Mahlleisten mit kurzer Entfernung und mit langer Entfernung zur Rotationsachse abwechseln.  In order to make full use of this, it is advantageous if mill strips alternate in the circumferential direction at a short distance and at a long distance from the axis of rotation.
Des Weiteren ist es von Vorteil, wenn die Teilung zumindest einiger Mahlleisten wenigstens einer Mahlfläche mit unterschiedlichem Abstand zur Rotationsachse erfolgt. Hierdurch können die von den Teilungen der Mahlleisten ausgehenden Inhomogenitäten auf einen möglichst großen radialen Bereich erstreckt werden, was einem ungleichmäßigen Verschleiß entgegenwirkt. Hierbei ist es besonders vorteilhaft, wenn sich der Abstand der Teilung zur Rotationsachse in Umfangsrichtung der Mahlfläche kontinuierlich vergrößert bzw. verkleinert. Furthermore, it is advantageous if the division takes place at least some Mahlleisten at least one grinding surface with a different distance from the axis of rotation. This can emanating from the divisions of Mahlleisten Inhomogeneities are extended to the largest possible radial region, which counteracts uneven wear. It is particularly advantageous if the distance of the pitch to the axis of rotation in the circumferential direction of the grinding surface continuously increases or decreases.
Nach der Teilung sollte der Abstand zwischen den sich teilenden Mahlleisten in einem, auf die Teilung folgenden Teilungsabschnitt radial nach außen stetig zunehmen. Der sich öffnende Spalt zwischen den Mahlleisten erhöht die Schnittkantenlänge, was sich entsprechend positiv auf die Behandlung auswirkt. After the division, the distance between the dividing grinding bars should increase steadily radially outward in a division section following the division. The opening gap between the grinding bars increases the cutting edge length, which has a correspondingly positive effect on the treatment.
Dabei hat es sich als optimal erwiesen, wenn sich der Teilungsabschnitt über eine Länge zwischen 10 und 50 mm erstreckt. It has proven to be optimal if the dividing section extends over a length between 10 and 50 mm.
Zur Erzeugung eines möglichst konstanten Schnittwinkels der Mahlleisten sollten die Mahlleisten außerhalb der Teilungsabschnitte weitestgehend parallel verlaufen. Hierzu ist es hilfreich, wenn zumindest jeweils eine der geteilten Mahlleisten nach einem auf die Teilung folgenden Teilungsabschnitt gekrümmt verläuft. In order to produce as constant as possible a cutting angle of the grinding bars, the grinding bars should extend as far as possible parallel outside the dividing sections. For this purpose, it is helpful if at least one of the divided grinding bars is curved after a division section following the division.
Im Interesse einer umfassend gleichbleibenden Wirkung der Mahlleisten sollte die Breite aller Mahlleisten außerhalb der, auf eine Teilung folgenden Teilungsabschnitte gleichgroß sein. In the interest of a fully consistent effect of Mahlleisten the width of all Mahlleisten should be the same size outside the, following a division division.
Des Weiteren ist es für die gleichmäßige Durchströmung von Vorteil, wenn die Breite der Nuten zwischen den Mahlleisten außerhalb der, auf eine Teilung folgenden Teilungsabschnitte gleichgroß ist.  Furthermore, it is advantageous for the uniform flow, if the width of the grooves between the Mahlleisten outside the, following a division division sections is the same size.
Zur Schaffung allmählicher Übergänge bei der Aufteilung der Mahlleisten ist es vorteilhaft, wenn sich einige, vorzugsweise alle Mahlleisten in jeweils zwei Mahlleisten teilen. To create gradual transitions in the distribution of Mahlleisten, it is advantageous if some, preferably all Mahlleisten share in two grinding bars.
Dabei hat es sich zur Erzeugung der bereits erwähnten konstanten Schnittwinkel als vorteilhaft erwiesen, wenn nach der Teilung einer Mahlleiste und einem auf die Teilung folgenden Teilungsabschnitt jeweils nur eine der beiden geteilten Mahlleisten gekrümmt verläuft und die gekrümmte Mahlleiste nach ihrer Krümmung parallel zu den beiden benachbarten Mahlleisten verläuft. Zur umfassenden Nutzung der Vorteile der Erfindung sollte sich daher die Entfernung des radial inneren Endes aller Mahlleisten beider Mahlflächen von der Rotationsachse um maximal 10%, bezogen auf die radiale Maximallänge der Mahlleisten, untereinander unterscheiden und sich einige der Mahlleisten radial nach außen teilen. It has proved to produce the already mentioned constant cutting angle advantageous if, after the division of a grinding bar and on the Division following dividing section only one of the two divided Mahlleisten curved and the curved Mahlleiste runs after their curvature parallel to the two adjacent Mahlleisten. To fully exploit the advantages of the invention, therefore, the distance of the radially inner end of all Mahlleisten both Mahlflächen of the rotation axis by a maximum of 10%, based on the radial maximum length of the grinding bars, differ from each other and share some of the grinding bars radially outward.
Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt: The invention will be explained in more detail with reference to an exemplary embodiment. In the attached drawing shows:
Figur 1 : einen schematischen Querschnitt durch eine Mahlanordnung;  FIG. 1 shows a schematic cross section through a grinding arrangement;
Figur 2: eine Mahlplatte; Figure 2: a grinding plate;
Figur 3: einen Ausschnitt gemäß Figur 2 und FIG. 3 shows a section according to FIG. 2 and FIG
Figur 4: eine andere Mahlplatte. Figure 4: another grinding plate.
Im Gehäuse der Mahlanordnung wird gemäß Figur 1 ein Mahlspalt 1 von einer feststehenden und mit dem Gehäuse gekoppelten Mahlfläche 2 und einer um eine Rotationsachse 6 rotierenden Mahlfläche 3 gebildet. In the housing of the grinding arrangement, according to FIG. 1, a grinding gap 1 is formed by a fixed grinding surface 2 coupled to the housing and a grinding surface 3 rotating about a rotation axis 6.
Dabei verlaufen die beiden kreisringförmigen Mahlflächen 2,3 parallel zueinander, wobei der Abstand zwischen diesen meist einstellbar ist.  In this case, the two annular grinding surfaces 2,3 parallel to each other, wherein the distance between these is usually adjustable.
Die rotierende Mahlfläche 3 wird hier von einer im Gehäuse rotierbar gelagerten Welle 7 in Rotationsrichtung bewegt. Angetrieben wird diese Welle 7 von einem ebenfalls im Gehäuse vorhandenen Antrieb. The rotating grinding surface 3 is here moved by a rotatably mounted in the housing shaft 7 in the direction of rotation. This shaft 7 is driven by a drive also provided in the housing.
Die zu mahlende Fasersuspension S gelangt bei dem hier gezeigten Beispiel über einen Zulauf durch das Zentrum in den Mahlspalt 1 zwischen den beiden Mahlflächen 2,3. Die Fasersuspension S passiert die zusammenwirkenden Mahlflächen 2,3 radial nach außen und verlässt den sich anschließenden Ringraum durch einen Ablauf. In the example shown here, the fiber suspension S to be ground passes through an inlet through the center into the grinding gap 1 between the two grinding surfaces 2, 3. The fiber suspension S passes through the cooperating grinding surfaces 2,3 radially outward and leaves the adjoining annular space through a drain.
Nicht dargestellt sind die an sich bekannten Mittel, mit denen eine Kraft erzeugt wird, um die beiden Mahlflächen 2,3 gegeneinander zu drücken. Not shown are the means known per se, with which a force is generated to press the two grinding surfaces 2,3 against each other.
Beide Mahlflächen 2,3 werden jeweils von mehreren Mahlplatten, wie in Figur 2 und 4 dargestellt, gebildet, die sich über jeweils ein Umfangsegment der entsprechenden Mahlfläche 2,3 erstrecken. Both grinding surfaces 2, 3 are each formed by a plurality of refining plates, as shown in FIGS. 2 and 4, which extend over in each case one circumferential segment of the corresponding refining surface 2, 3.
In Umfangsrichtung nebeneinander gereiht ergeben die Mahlplatten eine durchgehende Mahlfläche 2,3.  Sequentially juxtaposed in the circumferential direction, the refining plates yield a continuous grinding surface 2, 3.
Die Mahlplatten und damit auch die Mahlflächen 2,3 werden, wie in den Figuren 2 bis 4 dargestellt, von einer Vielzahl von im Wesentlichen radial verlaufenden Mahlleisten 4 und dazwischenliegenden Nuten 5 gebildet. The refining plates and thus also the grinding surfaces 2, 3 are formed, as shown in FIGS. 2 to 4, by a multiplicity of essentially radially extending grinding bars 4 and grooves 5 located therebetween.
Der Querschnitt der Mahlleisten 4, auch Messer genannt, ist im Allgemeinen rechteckig, wobei es aber auch andere Formen gibt. The cross section of Mahlleisten 4, also called knife, is generally rectangular, but there are other forms.
Die zwischen den Mahlleisten 4 verlaufenden Nuten 5 haben ebenfalls einen rechteckigen Querschnitt und dienen als Strömungskanäle für die Fasersuspension S. Die Nuttiefe beträgt meist zwischen 2 und 20 mm.  The grooves 5 extending between the milling strips 4 likewise have a rectangular cross-section and serve as flow channels for the fiber suspension S. The groove depth is usually between 2 and 20 mm.
Erfindungswesentlich ist hierbei, dass sich die Entfernung des radial inneren Endes aller Mahlleisten 4 beider Mahlflächen von der Rotationsachse 6 um maximal 10%, bezogen auf die radiale Maximallänge der Mahlleisten 4, untereinander unterscheidet. Unberücksichtigt hiervon sind Unterbrechungen der Mahlleisten 4, wie sie bei der Segmentierung der Mahlfläche in Mahlplatten oder bei Bohrungen 8 für die Befestigung der Mahlplatten erforderlich sind. Essential to the invention here is that the distance between the radially inner end of all grinding bars 4 both grinding surfaces of the rotation axis 6 by a maximum of 10%, based on the radial maximum length of the grinding bars 4, with each other. Disregarded here are interruptions of Mahlleisten 4, as required in the segmentation of the grinding surface in refining plates or holes 8 for the attachment of the refining plates.
Um die Nutbreite bei konstanter und gleicher Breite der Mahlleisten 4 radial nach außen nicht zu groß werden zu lassen, teilen sich zumindest einige Mahlleisten 4 in jeweils zwei Mahlleisten 4 auf. Der Ort der Teilung variiert dabei hinsichtlich seiner Entfernung zur Rotationsachse 6. Auch eine mehrfache Aufteilung einer Mahlleiste 4 radial hintereinander ist möglich. In order not to let the groove width at a constant and equal width of the grinding bars 4 radially outwards become too large, at least some grinding bars 4 are divided into two grinding bars 4 in each case. The location of the pitch varies with respect to its distance from the axis of rotation 6. Also a multiple division of a grinding bar 4 radially behind each other is possible.
Im Ergebnis verteilen sich so die von der Teilung der Mahlleisten 4 ausgehenden Turbulenzen in der Faserstoffsuspension S und die mit ihr verbundenen Verschleißwirkungen auf die Mahlleisten 4 relativ gleichmäßig über die gesamte Mahlfläche. As a result, the turbulence in the pulp suspension S emanating from the division of the grinding strips 4 and the associated wear effects on the grinding bars 4 are distributed relatively uniformly over the entire grinding surface.
Bei der Ausführung gemäß Figur 4 nimmt der Abstand zwischen Teilung und Rotationsachse 6 in Umfangsrichtung der Mahlfläche in kleinen Schritten kontinuierlich zu, so dass die in Umfangsrichtung benachbarten Teilungen spiralförmig verlaufen. In the embodiment according to FIG. 4, the distance between the graduation and the axis of rotation 6 increases continuously in small increments in the circumferential direction of the grinding surface, so that the circumferentially adjacent divisions run in a spiral.
Dies trägt wesentlich zur Vergleichsmäßigung bei. Dabei nimmt der Abstand zwischen den sich teilenden Mahlleisten 4 in einem, auf die Teilung folgenden Teilungsabschnitt 9 radial nach außen stetig zu. Zur Steigerung der Stabilität könnte der sich öffnende Spalt des Teilungsabschnittes 9 zwar mit Material aufgefüllt werden, allerdings überwiegen hier die Vorteile einer erhöhten Schnittkantenlänge.  This contributes significantly to the reduction in price. In this case, the distance between the dividing Mahlleisten 4 in a, following the division following division section 9 radially outward steadily. To increase the stability of the opening gap of the dividing section 9 could indeed be filled with material, but here outweigh the benefits of increased cut edge length.
Die Länge des Teilungsabschnitts 9 liegt zwischen 10 und 50 mm. The length of the dividing section 9 is between 10 and 50 mm.
Entsprechend den Anforderungen an die Mahlfläche können sich, wie in Figur 4, einige oder, wie in Figur 2 gezeigt, alle Mahlleisten 4 in jeweils zwei Mahlleisten 4 teilen. In accordance with the requirements of the grinding surface, as in FIG. 4, some or, as shown in FIG. 2, all the grinding bars 4 can each split into two grinding bars 4.
Figur 4 zeigt außerdem auch die Möglichkeit, dass sich eine Mahlleiste 4 radial hintereinander mehrfach in jeweils zwei Mahlleisten 4 teilt. In addition, FIG. 4 also shows the possibility that a grinding bar 4 divides radially one after the other several times into two grinding bars 4 in each case.
Zur Bildung möglichst konstanter Schnittwinkel verlaufen die Mahlleisten 4 außerhalb der Teilungsabschnitte 9 parallel, wobei insbesondere die sich nicht teilenden Mahlleisten 4 entsprechend Figur 4 eine oder mehrere Krümmungen aufweisen können. Aus gleichem Grund verläuft nach der Teilung einer Mahlleiste 4 und einem auf die Teilung folgenden Teilungsabschnitt 9 jeweils eine der beiden geteilten Mahlleisten 4 gekrümmt. Im Interesse einer optimalen und gleichmäßigen Wirkung der Mahlfläche 2,3 ist die Breite aller Mahlleisten 4 außerhalb der, auf eine Teilung folgenden Teilungsabschnitte 9 gleichgroß. To form the most constant possible cutting angle, the grinding bars 4 run parallel outside the dividing sections 9, wherein in particular the non-dividing grinding bars 4 according to FIG. 4 can have one or more bends. For the same reason, after the division of a grinding bar 4 and a dividing section 9 following the division, one of the two divided grinding bars 4 runs in each case curved. In the interests of an optimal and uniform effect of the grinding surface 2,3, the width of all grinding bars 4 outside the, following a division following division sections 9 is the same size.
Um den Durchfluss der Fasersuspension S nicht zu behindern, ist außerdem die Breite der Nuten 5 zwischen den Mahlleisten 4 außerhalb der, auf eine Teilung folgenden Teilungsabschnitte 9 gleichgroß. In order not to hinder the flow of the fiber suspension S, moreover, the width of the grooves 5 between the grinding bars 4 outside the, following a division following division sections 9 is the same size.
Bei Figur 2 wird die Mahlfläche umfassend genutzt, weshalb das radial innere Ende aller Mahlleisten 4 beider Mahlflächen 2,3 gleichweit von der Rotationsachse 6 entfernt ist. In Figure 2, the grinding surface is used extensively, which is why the radially inner end of all grinding bars 4 of both grinding surfaces 2,3 is equidistant from the axis of rotation 6.
Im Gegensatz hierzu sollen die radial inneren Enden der Mahlleisten 4 gemäß Figur 4 zusätzliche Turbulenzen erzeugen und so den Einzug der Fasern der Faserstoffsuspension S zwischen die Mahlleisten 4 verbessern. Daher wechseln sich hier in Umfangsrichtung Mahlleisten 4 mit kurzer Entfernung und mit langer Entfernung zur Rotationsachse 6 ab. In contrast to this, the radially inner ends of the grinding bars 4 according to FIG. 4 are intended to generate additional turbulence and thus improve the intake of the fibers of the pulp suspension S between the grinding bars 4. Therefore, milling strips 4 alternate here in the circumferential direction with a short distance and with a long distance to the axis of rotation 6.

Claims

Patentansprüche 1 . Mahlanordnung zur Mahlung von wässrig suspendierten Zellstofffasern zwischen zwei, einen Mahlspalt (1 ) bildenden und relativ zueinander rotierenden Mahlflächen (2,3), die von Mahlleisten (4) und dazwischen verlaufenden Nuten (5) gebildet werden, wobei sich die Mahlleisten (4) zumindest mit der wesentlichen Richtungskomponente radial bezüglich der Rotationsachse (6) erstrecken, dadurch gekennzeichnet, dass sich die Entfernung des radial inneren Endes aller Mahlleisten (4) wenigstens jeweils einer Mahlfläche von der Rotationsachse (6) um maximal 10%, bezogen auf die radiale Maximallänge der Mahlleisten (4), untereinander unterscheidet und sich einige der Mahlleisten (4) radial nach außen teilen. Claims 1. Grinding arrangement for grinding aqueous suspended pulp fibers between two grinding surfaces (2, 3) forming a grinding gap (1) and rotating relative to each other, which are formed by grinding bars (4) and grooves (5) extending therebetween, the grinding bars (4) extend at least with the essential direction component radially with respect to the axis of rotation (6), characterized in that the distance of the radially inner end of all Mahlleisten (4) at least one grinding surface of the rotation axis (6) by a maximum of 10%, based on the radial maximum length the Mahlleisten (4), with each other and some of the Mahlleisten (4) share radially outward.
2. Mahlanordnung nach Anspruch 1 , dadurch gekennzeichnet, dass das radial innere Ende aller Mahlleisten (4) wenigstens einer Mahlfläche (2,3) gleichweit von der Rotationsachse (6) entfernt ist. 3. Mahlanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das radial innere Ende aller Mahlleisten (4) wenigstens einer Mahlfläche (2,2. grinding arrangement according to claim 1, characterized in that the radially inner end of all Mahlleisten (4) at least one grinding surface (2,3) equidistant from the axis of rotation (6) is removed. 3. grinding arrangement according to claim 1 or 2, characterized in that the radially inner end of all the grinding bars (4) at least one grinding surface (2,
3) unterschiedlich weit von der Rotationsachse (6) entfernt ist. 3) is far different from the axis of rotation (6).
4. Mahlanordnung nach Anspruch 3, dadurch gekennzeichnet, dass sich in Umfangsrichtung Mahlleisten (4) mit kurzer Entfernung und mit langer Entfernung zur Rotationsachse (6) abwechseln. 4. grinding arrangement according to claim 3, characterized in that in the circumferential direction Mahlleisten (4) with a short distance and with a long distance to the rotation axis (6) alternate.
5. Mahlanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Teilung zumindest einiger Mahlleisten (4) wenigstens einer Mahlfläche mit unterschiedlichem Abstand zur Rotationsachse (6) erfolgt. 5. grinding arrangement according to one of the preceding claims, characterized in that the division of at least some Mahlleisten (4) at least one grinding surface with a different distance from the axis of rotation (6).
6. Mahlanordnung nach Anspruch 5, dadurch gekennzeichnet, dass sich der Abstand der Teilung zur Rotationsachse (6) in Umfangsnchtung der Mahlfläche kontinuierlich vergrößert. 6. grinding arrangement according to claim 5, characterized in that the distance of the pitch to the rotation axis (6) increases in Umfangsnchtung the grinding surface continuously.
7. Mahlanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Abstand zwischen den sich teilenden Mahlleisten (4) in einem, auf die Teilung folgenden Teilungsabschnitt (9) radial nach außen stetig zunimmt. 7. grinding arrangement according to one of the preceding claims, characterized in that the distance between the dividing Mahlleisten (4) in a, following the division division section (9) increases radially outward steadily.
8. Mahlanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zumindest eine der geteilten Mahlleisten (4) nach einem auf die Teilung folgenden Teilungsabschnitt (9) gekrümmt verläuft. 8. grinding arrangement according to one of the preceding claims, characterized in that at least one of the divided Mahlleisten (4) after a division following the division division (9) is curved.
9. Mahlanordnung nach einem der vorhergehenden Ansprüche , dadurch gekennzeichnet, dass die Breite aller Mahlleisten (4) außerhalb der, auf eine9. grinding arrangement according to one of the preceding claims, characterized in that the width of all grinding strips (4) outside of, on a
Teilung folgenden Teilungsabschnitte (9) gleichgroß ist. Division of the following division sections (9) is the same size.
10. Mahlanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Breite der Nuten (5) zwischen den Mahlleisten (4) außerhalb der, auf eine Teilung folgenden Teilungsabschnitte (9) gleichgroß ist. 10. grinding arrangement according to one of the preceding claims, characterized in that the width of the grooves (5) between the Mahlleisten (4) outside the, following a division following division sections (9) is the same size.
1 1 . Mahlanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich einige, vorzugsweise alle Mahlleisten (4) in jeweils zwei Mahlleisten (4) teilen. 1 1. Grinding arrangement according to one of the preceding claims, characterized in that some, preferably all grinding strips (4) in each case two Mahlleisten (4) share.
12. Mahlanordnung nach Anspruch 1 1 , dadurch gekennzeichnet, dass nach der Teilung einer Mahlleiste (4) und einem auf die Teilung folgenden Teilungsabschnitt (9) jeweils nur eine der beiden geteilten Mahlleisten (4) gekrümmt verläuft. 12. grinding arrangement according to claim 1 1, characterized in that after the division of a grinding bar (4) and a division following the division (9) each only one of the two divided Mahlleisten (4) is curved.
13. Mahlanordnung nach Anspruch 12, dadurch gekennzeichnet, dass die gekrümmte Mahlleiste (4) nach ihrer Krümmung parallel zu den beiden benachbarten Mahlleisten (4) verläuft. 13. grinding arrangement according to claim 12, characterized in that the curved grinding bar (4) according to their curvature parallel to the two adjacent grinding strips (4).
14. Mahlanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich die Entfernung des radial inneren Endes aller Mahlleisten (4) beider Mahlflächen von der Rotationsachse (6) um maximal 10%, bezogen auf die radiale Maximallänge der Mahlleisten, untereinander unterscheidet und sich einige der Mahlleisten (4) radial nach außen teilen. 14. grinding arrangement according to one of the preceding claims, characterized in that the distance of the radially inner end of all Mahlleisten (4) both grinding surfaces of the rotation axis (6) by a maximum of 10%, based on the radial maximum length of the grinding bars, different from each other and themselves Sharpen some of the Mahlleisten (4) radially outward.
EP15808576.1A 2015-02-10 2015-12-11 Refiner plate Active EP3256640B1 (en)

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DE102015202318.4A DE102015202318A1 (en) 2015-02-10 2015-02-10 grinding set
PCT/EP2015/079376 WO2016128092A1 (en) 2015-02-10 2015-12-11 Refiner plate

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DE102017120162A1 (en) * 2017-09-01 2019-03-07 Voith Patent Gmbh Conical grinding arrangement
US11643779B2 (en) * 2019-12-13 2023-05-09 Andritz Inc. Refiner plate having grooves imparting rotational flow to feed material
CN114438810B (en) * 2022-01-24 2023-12-29 丹东鸭绿江磨片有限公司 Grinding disc or millstone with narrow pipe teeth and pulping machine

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US100537A (en) * 1870-03-08 Improved mill-stone dress
US3059863A (en) * 1959-04-06 1962-10-23 Bolton John W & Sons Inc Segmental filling for refiner plugs
WO2000011264A1 (en) * 1998-08-19 2000-03-02 Durametal Corporation Refiner plate with chicanes
DE102012214980A1 (en) * 2012-08-23 2014-02-27 Voith Patent Gmbh Milling arrangement for milling aqueously suspended cellulose fibers between conical milling surfaces, has closed housing with inlet and outlet, where milling plates of milling surfaces are fixed on supporting surfaces by fastening ring
CN203200584U (en) * 2013-03-27 2013-09-18 杭州江菱造纸机械设备厂 Novel energy-saving pulping machine low-pressure cutting disc
CN204224912U (en) * 2014-09-05 2015-03-25 福伊特专利有限公司 A kind of abrasive disc of papermaking defibrination

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ES2710324T3 (en) 2019-04-24
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EP3256640B1 (en) 2018-11-21
CN107109789A (en) 2017-08-29
DE202015009379U1 (en) 2017-05-02
DE102015202318A1 (en) 2016-08-11

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