EP3714098B1 - Grinding device - Google Patents

Grinding device Download PDF

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Publication number
EP3714098B1
EP3714098B1 EP18789573.5A EP18789573A EP3714098B1 EP 3714098 B1 EP3714098 B1 EP 3714098B1 EP 18789573 A EP18789573 A EP 18789573A EP 3714098 B1 EP3714098 B1 EP 3714098B1
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EP
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Prior art keywords
shaft
base plate
axial
rotating base
rotating
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EP18789573.5A
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German (de)
French (fr)
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EP3714098A1 (en
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Martin Heim
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Voith Patent GmbH
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Voith Patent GmbH
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    • 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
    • D21D1/303—Double disc mills
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G5/00—Safety devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0018—Paper-making control systems controlling the stock preparation

Definitions

  • the invention relates to a device for treating pulp with two grinding gaps arranged in a housing and radially flowed through by pulp, each of which is formed by a treatment tool rotating about an axis of rotation and a non-rotating treatment tool, the treatment tools each being attached to a base plate are, have a rotationally symmetrical shape and are arranged coaxially to one another, the two rotating treatment tools are fastened to a common base plate driven by a rotatably mounted shaft and are arranged between the two non-rotating treatment tools, the rotating base plate is fastened axially displaceably on the shaft and the width of the grinding gap can be changed via an axial displacement of at least one non-rotating base plate.
  • the invention also relates to a method for operating this device.
  • Such a device is known in particular from DE 100 66 175 B4 .
  • the grinding strips are called knives and the grinding surfaces are formed by grinding sets.
  • the refiners can be designed as disc refiners or cone refiners.
  • the grinding clothing In order to achieve the desired fiber properties, in particular the degree of freeness, the grinding clothing must be adapted as best as possible to the fiber material to be treated, also in order to prevent excessive wear of the clothing.
  • the treatment surfaces are formed by replaceable fittings that are screwed to the corresponding base plate because of the relatively rapid wear and tear.
  • the object of the invention is therefore to reduce the wear and tear and the susceptibility to failure of grinding arrangements with as little effort as possible.
  • the object was achieved in that the shaft is assigned a measuring unit for detecting the axial force acting on the shaft.
  • the bearing of the shaft and the axial displaceability of the shaft against a force element can be very advantageously combined with one another via a measuring unit according to the invention for detecting the axial force acting on the shaft.
  • this measuring unit should comprise an axial bearing arranged on the shaft, which is pressed by a force element supported on the housing against a stop on the shaft pointing in the direction of the axial force to be measured, with a sensor detecting the relative, axial position of the axial bearing to the housing.
  • the preload by means of a force element also ensures the necessary minimum load on the axial bearing and improves the concentricity of the bearing.
  • the axial bearing should be guided radially in a bearing housing coupled to the housing.
  • non-rotating base plates can be done easily and safely by means of a screw jack.
  • construction is simplified if a non-rotating base plate is axially adjustable by means of a screw jack and the other non-rotating base plate is fixed to the housing.
  • the structure is simplified in the event that the shaft is guided into a gearbox coupled to a drive.
  • the treatment tool and base plate can also be made in one piece.
  • the axial displacement of the non-rotating base plate should be stopped when a predetermined axial force of the shaft is exceeded or the width of the grinding gap should even be increased by a corresponding axial displacement of the non-rotating base plate.
  • changes in the axial force during operation also provide helpful information on the state of wear of the treatment tools.
  • the treatment tools 4, 5 each have a rotationally symmetrical shape, the two circular ring-shaped grinding surfaces being arranged parallel and coaxially to one another.
  • Both treatment tools 4, 5 of a grinding gap 2, 3 are each formed by a plurality of grinding plates which each extend over a circumferential segment of the corresponding grinding surface.
  • the grinding plates result in a continuous grinding surface of the treatment tool 4, 5.
  • the grinding plates and thus also the grinding surfaces are generally formed by a large number of essentially radially extending grinding strips and grooves in between.
  • the treatment tools 4, 5 are each releasably attached to a base plate 6, 7 and can thus be easily changed.
  • the two rotating treatment tools 5 are attached to a common base plate 7 driven by a rotatably mounted shaft 9.
  • the rotating base plate 7 with its treatment tools 5 is accordingly located between the two non-rotating base plates 6 and its treatment tools 4.
  • the fiber suspension to be milled reaches one of the two milling gaps 2, 3 via an inlet 18 through the center.
  • the fiber suspension passes the interacting grinding surfaces of the grinding gaps 2, 3 radially outwards and collects in the adjoining annular space 19. While at least part of the fiber suspension treated in this way leaves this annular space 19 through an outlet, the other part of the fiber suspension can under certain circumstances pass through the Grooves of the non-rotating grinding surface flow back through a section of their length.
  • the cross-section of the grinding bars also known as knives, is generally rectangular, but there are also other shapes.
  • the top of these grinding bars that is to say the surfaces carrying the grinding edges, lie in the radial plane.
  • the grooves running between the grinding bars also have a rectangular cross section and serve as flow channels for the fiber suspension.
  • the groove depth is usually between 2 and 20 mm.
  • the treatment gaps 2, 3 can run not only perpendicularly but also inclined to the axis of rotation 8, as in the case of cone refiners.
  • the shaft 9 is driven by a drive via a transmission 17 which is present here, for example, in the housing 1 of the refiner and into which the shaft 9 extends.
  • a non-rotating base plate 6 is axially adjustable by means of a screw jack 16 and the other non-rotating base plate 6 is connected to the housing 1.
  • the rotating base plate 7 Since the rotating base plate 7 is axially displaceable on the shaft 9, it balances the pressure between the two grinding gaps 2, 3, so that a change in the total width of both grinding gaps 2, 3 also has an effect on the individual widths of both grinding gaps 2, 3.
  • the rotating base plate 7 can reduce the pressure between the two grinding gaps 2,3 when the total width of both grinding gaps 2,3 is adjusted no longer compensate.
  • the shaft 9 is mounted so as to be axially displaceable against a force element 12 in the form of a spring element.
  • the force element 12 improves the concentricity of the axial bearing 11.
  • the axial force F acting on the shaft 9 is measured by means of a measuring unit 10 assigned to the shaft 9.
  • the measuring unit 10 for the axial force F comprises an axial bearing 11 which is arranged on the shaft 9 and which is fixed radially in a bearing housing 15 coupled to the housing 1.
  • the axial bearing 11 is pressed by the force element 12 supported on the bearing housing 15 against a stop 13 of the shaft 9 pointing in the direction of the axial force 7 to be measured, a sensor 14 recording the relative, axial position of the axial bearing 11 to the bearing housing 15 and thus also recorded for housing 1 of the refiner.
  • inductive sensors In particular, inductive sensors, load cells or the like can be used as sensor 14 in this demanding environment.
  • the axial displacement of the non-rotating base plate 6 can be stopped when a predetermined axial force F of the shaft 9 is exceeded or, in the case of a very high axial force F, the total width of the grinding gaps 2, 3 can be stopped by a corresponding axial displacement of the non-rotating base plate 6 be enlarged.
  • the treatment intensity of the pulp i.e. the grinding capacity in this case, is essentially determined by the specific drive power of the refiner.
  • the width of the treatment gap 6 is therefore set in such a way that an optimal axial force F corresponding to the fibrous material to be treated and the desired parameters of the fibrous material after the treatment results.

Description

Die Erfindung betrifft eine Vorrichtung zur Behandlung von Faserstoff mit zwei, in einem Gehäuse angeordneten und vom Faserstoff radial durchströmten Mahlspalten, die jeweils von einem, um eine Rotationsachse rotierenden Behandlungswerkzeug und einem nicht-rotierenden Behandlungswerkzeug gebildet werden, wobei die Behandlungswerkzeuge jeweils auf einer Grundplatte befestigt sind, eine rotationssymmetrische Form haben und koaxial zueinander angeordnet sind, die beiden rotierenden Behandlungswerkzeuge an einer gemeinsamen, von einer rotierbar gelagerten Welle angetriebenen Grundplatte befestigt und zwischen den beiden nicht-rotierenden Behandlungswerkzeugen angeordnet sind, die rotierende Grundplatte axial verschiebbar auf der Welle befestigt ist und die Breite der Mahlspalte über eine axiale Verschiebung wenigstens einer nicht-rotierenden Grundplatte veränderbar ist.The invention relates to a device for treating pulp with two grinding gaps arranged in a housing and radially flowed through by pulp, each of which is formed by a treatment tool rotating about an axis of rotation and a non-rotating treatment tool, the treatment tools each being attached to a base plate are, have a rotationally symmetrical shape and are arranged coaxially to one another, the two rotating treatment tools are fastened to a common base plate driven by a rotatably mounted shaft and are arranged between the two non-rotating treatment tools, the rotating base plate is fastened axially displaceably on the shaft and the width of the grinding gap can be changed via an axial displacement of at least one non-rotating base plate.

Die Erfindung betrifft ebenso ein Verfahren zum Betrieb dieser Vorrichtung.The invention also relates to a method for operating this device.

Bekannt ist eine derartige Vorrichtung insbesondere aus der DE 100 66 175 B4 .Such a device is known in particular from DE 100 66 175 B4 .

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 grind cellulose fibers, i.e. fresh cellulose and / or waste paper fibers, in order to be able to achieve the desired properties, in particular with regard to strength, formation and surface, in the fibrous web produced therefrom.

Bei den dabei in der Regel zum Einsatz kommenden Refinern werden die Mahlleisten Messer genannt und die Mahlflächen von Mahlgarnituren gebildet.In the case of the refiners that are usually used, the grinding strips are called knives and the grinding surfaces are formed by grinding sets.

Die Refiner können als Scheibenrefiner oder Kegelrefiner ausgebildet sein.The refiners can be designed as disc refiners or cone refiners.

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.In order to achieve the desired fiber properties, in particular the degree of freeness, the grinding clothing must be adapted as best as possible to the fiber material to be treated, also in order to prevent excessive wear of the clothing.

Um eine Beschädigung der Mahlgarnituren durch größere Fremdkörper zu verhindern, werden dem Refiner oft unempfindliche Dickstoffrefiner oder Sortierer vorgeschaltet, was relativ aufwendig ist.In order to prevent damage to the grinding sets by larger foreign bodies, insensitive thick matter refiners or sorters are often connected upstream of the refiner, which is relatively expensive.

Durch die relativ hohe Konsistenz, die der Faserstoff bei der Behandlung hat, ist eine intensive mechanische Bearbeitung bei derartigen Vorrichtungen möglich, obwohl sich die relativ zueinander bewegbaren Behandlungswerkzeuge nicht berühren, sondern sich vielmehr in einem geringen Abstand aneinander vorbeibewegen. Dabei treten ganz erhebliche Kräfte auf.Due to the relatively high consistency that the fibrous material has during treatment, intensive mechanical processing is possible with such devices, although the treatment tools which can be moved relative to one another do not touch, but rather move past one another at a small distance. This creates very considerable forces.

Bei den bei der Faserstoffaufbereitung zum Einsatz kommenden Refinern werden die Behandlungsflächen wegen des relativ schnellen Verschleißes von auswechselbaren, mit der entsprechenden Grundplatte verschraubten Garnituren gebildet.In the case of the refiners used in pulp preparation, the treatment surfaces are formed by replaceable fittings that are screwed to the corresponding base plate because of the relatively rapid wear and tear.

Außerdem wird zur Effizienzsteigerung der Faserbehandlung eine optimale Nutzung der verfügbaren Behandlungsfläche angestrebt.In addition, an optimal use of the available treatment area is sought to increase the efficiency of fiber treatment.

In allen Fällen vermindert sich bei einem zu großen Spalt die Effizienz der Behandlung. Bei einem zu kleinen Spalt wiederum besteht die Gefahr einer zu hohen, elektrischen Stromaufnahme und des Kontakts der Behandlungswerkzeuge.In all cases, if the gap is too large, the efficiency of the treatment is reduced. If the gap is too small, on the other hand, there is a risk of excessive electrical current consumption and contact between the treatment tools.

Die Aufgabe der Erfindung ist es daher den Verschleiß und die Störanfälligkeit von Mahlanordnungen mit möglichst geringem Aufwand zu vermindern.The object of the invention is therefore to reduce the wear and tear and the susceptibility to failure of grinding arrangements with as little effort as possible.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass der Welle eine Messeinheit zur Erfassung der auf die Welle einwirkenden Axialkraft zugeordnet ist.According to the invention, the object was achieved in that the shaft is assigned a measuring unit for detecting the axial force acting on the shaft.

Auf diese Weise kann auf Störungen sofort reagiert werden, so dass Schäden insbesondere an der Lagerung der Welle oder den Behandlungswerkzeugen oft vermieden werden. Dies wiederum erlaubt es, die Lagerung der Welle nicht mehr auf extrem große Axialbelastungen auszulegen, was Raum und Kosten spart.In this way, it is possible to react immediately to malfunctions, so that damage, in particular to the bearing of the shaft or the treatment tools, is often avoided. This in turn makes it possible to no longer design the bearing of the shaft for extremely large axial loads, which saves space and costs.

Über die Kenntnis der Axialkraft können aber auch Aussagen über die Strömungen zwischen den Behandlungswerkzeugen sowie die Behandlung der Fasern im Behandlungsspalt getroffen werden.By knowing the axial force, however, statements can also be made about the flows between the treatment tools and the treatment of the fibers in the treatment gap.

Die Lagerung der Welle sowie die axiale Verschiebbarkeit der Welle gegen ein Kraftelement lassen sich über eine erfindungsgemäße Messeinheit zur Erfassung der auf die Welle wirkenden Axialkraft sehr vorteilhaft miteinander verbinden.The bearing of the shaft and the axial displaceability of the shaft against a force element can be very advantageously combined with one another via a measuring unit according to the invention for detecting the axial force acting on the shaft.

Hierzu sollte diese Messeinheit ein auf der Welle angeordnetes Axiallager umfassen, welches von einem, sich am Gehäuse abstützenden Kraftelement gegen einen in Richtung der zu messenden Axialkraft weisenden Anschlag der Welle gedrückt wird, wobei ein Sensor die relative, axiale Lage des Axiallagers zum Gehäuse erfasst. Übe die Vorspannung mittels Kraftelement werden außerdem die notwendige Mindestbelastung des Axiallagers gewährleistet und der Rundlauf des Lagers verbessert.For this purpose, this measuring unit should comprise an axial bearing arranged on the shaft, which is pressed by a force element supported on the housing against a stop on the shaft pointing in the direction of the axial force to be measured, with a sensor detecting the relative, axial position of the axial bearing to the housing. The preload by means of a force element also ensures the necessary minimum load on the axial bearing and improves the concentricity of the bearing.

Zur Stabilisierung sollte das Axiallager dabei radial in einem mit dem Gehäuse gekoppelten Lagergehäuse geführt sein.For stabilization, the axial bearing should be guided radially in a bearing housing coupled to the housing.

Die axiale Verstellung einer oder beider nicht-rotierender Grundplatten kann einfach und sicher mittels Spindelhubelement erfolgen. Die Konstruktion vereinfacht sich allerdings, wenn eine nicht-rotierenden Grundplatte mittels Spindelhubelement axial verstellbar und die andere nicht-rotierende Grundplatte am Gehäuse fixiert ist.The axial adjustment of one or both non-rotating base plates can be done easily and safely by means of a screw jack. However, the construction is simplified if a non-rotating base plate is axially adjustable by means of a screw jack and the other non-rotating base plate is fixed to the housing.

Des Weiteren vereinfacht sich der Aufbau im Fall, dass die Welle in ein, mit einem Antrieb gekoppeltes Getriebe hinein geführt ist.Furthermore, the structure is simplified in the event that the shaft is guided into a gearbox coupled to a drive.

Bei speziellen Ausführungen können Behandlungswerkzeug und Grundplatte auch einstückig ausgeführt sein.In the case of special designs, the treatment tool and base plate can also be made in one piece.

Um Schaden beim Betrieb der Vorrichtung zu vermeiden, sollte beim Überschreiten einer vorgegebenen Axialkraft der Welle die axiale Verschiebung der nicht-rotierenden Grundplatte gestoppt oder sogar die Breite des Mahlspaltes durch eine entsprechende axiale Verschiebung der nicht-rotierenden Grundplatte vergrößert werden.In order to avoid damage during the operation of the device, the axial displacement of the non-rotating base plate should be stopped when a predetermined axial force of the shaft is exceeded or the width of the grinding gap should even be increased by a corresponding axial displacement of the non-rotating base plate.

Unabhängig davon kann beim stetigen Anstieg der Axialkraft während des Betriebs bei der Steuerung der Vorrichtung auf einen Verschleiß der Verbindung zwischen rotierender Grundplatte und Welle geschlossen werden. Auf dieser Basis können dann die Betriebsparameter der Vorrichtung entsprechend angepasst und die Reparatur geplant werden.Regardless of this, with the constant increase in the axial force during operation, when controlling the device, it can be concluded that the connection between the rotating base plate and the shaft is worn. On this basis, the operating parameters of the device can then be adjusted accordingly and the repair planned.

In diesem Zusammenhang geben Veränderungen der Axialkraft während des Betriebs auch hilfreiche Informationen zum Verschleißzustand der Behandlungswerkzeuge.In this context, changes in the axial force during operation also provide helpful information on the state of wear of the treatment tools.

Im Normalbetrieb sind die Axialkräfte auf die Welle sehr klein.In normal operation, the axial forces on the shaft are very small.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt:

  • Figur 1: einen schematischen Querschnitt durch einen Refiner und
  • Figur 2: die Messeinheit 10 zur Bestimmung der Axialkraft F.
The invention will be explained in more detail below using an exemplary embodiment. In the attached drawing shows:
  • Figure 1 : a schematic cross section through a refiner and
  • Figure 2 : the measuring unit 10 for determining the axial force F.

Im Gehäuse 1 der Mahlanordnung gemäß Figur 1 befinden sich zwei radial vom Faserstoff durchströmte Mahlspalte 2,3, die jeweils von einem nicht-rotierenden und mit dem Gehäuse 1 gekoppelten Behandlungswerkzeug 4 und einem um eine Rotationsachse 8 rotierenden Behandlungswerkzeug 5 gebildet werden.In the housing 1 of the grinding arrangement according to Figure 1 there are two grinding gaps 2, 3 through which the fiber material flows, each of which is formed by a non-rotating treatment tool 4 coupled to the housing 1 and a treatment tool 5 rotating about an axis of rotation 8.

Dabei haben die Behandlungswerkzeuge 4,5 jeweils eine rotationssymmetrische Form, wobei die beiden kreisringförmigen Mahlflächen parallel und koaxial zueinander angeordnet sind.The treatment tools 4, 5 each have a rotationally symmetrical shape, the two circular ring-shaped grinding surfaces being arranged parallel and coaxially to one another.

Beide Behandlungswerkzeuge 4,5 eines Mahlspalts 2,3 werden jeweils von mehreren Mahlplatten gebildet, die sich über jeweils ein Umfangsegment der entsprechenden Mahlfläche erstrecken.Both treatment tools 4, 5 of a grinding gap 2, 3 are each formed by a plurality of grinding plates which each extend over a circumferential segment of the corresponding grinding surface.

In Umfangsrichtung nebeneinander gereiht ergeben die Mahlplatten eine durchgehende Mahlfläche des Behandlungswerkzeugs 4,5.Lined up next to one another in the circumferential direction, the grinding plates result in a continuous grinding surface of the treatment tool 4, 5.

Die Mahlplatten und damit auch die Mahlflächen werden in der Regel von einer Vielzahl von im Wesentlichen radial verlaufenden Mahlleisten und dazwischenliegenden Nuten gebildet.The grinding plates and thus also the grinding surfaces are generally formed by a large number of essentially radially extending grinding strips and grooves in between.

Wegen der hohen Beanspruchung und des damit verbundenen Verschleißes sind die Behandlungswerkzeuge 4,5 jeweils auf einer Grundplatte 6,7 lösbar befestigt und können so leicht gewechselt werden.Because of the high stress and the associated wear and tear, the treatment tools 4, 5 are each releasably attached to a base plate 6, 7 and can thus be easily changed.

Um nur eine Grundplatte 7 antreiben zu müssen, sind die beiden rotierenden Behandlungswerkzeuge 5 an einer gemeinsamen, von einer rotierbar gelagerten Welle 9 angetriebenen Grundplatte 7 befestigt. Dementsprechend befindet sich die rotierende Grundplatte 7 mit ihren Behandlungswerkzeugen 5 zwischen den beiden nicht-rotierenden Grundplatten 6 und ihren Behandlungswerkzeugen 4.In order to have to drive only one base plate 7, the two rotating treatment tools 5 are attached to a common base plate 7 driven by a rotatably mounted shaft 9. The rotating base plate 7 with its treatment tools 5 is accordingly located between the two non-rotating base plates 6 and its treatment tools 4.

Die zu mahlende Fasersuspension gelangt bei dem hier gezeigten Beispiel über einen Zulauf 18 durch das Zentrum in einen der beiden Mahlspalte 2,3. Die Fasersuspension passiert die zusammenwirkenden Mahlflächen der Mahlspalte 2,3 radial nach außen und sammelt sich in dem sich anschließenden Ringraum 19. Während zumindest ein Teil der so behandelten Fasersuspension diesen Ringraum 19 durch einen Ablauf verlässt, kann unter Umständen der andere Teil der Fasersuspension durch die Nuten der nicht-rotierenden Mahlfläche durch einen Abschnitt ihrer Länge wieder zurückfließen.In the example shown here, the fiber suspension to be milled reaches one of the two milling gaps 2, 3 via an inlet 18 through the center. The fiber suspension passes the interacting grinding surfaces of the grinding gaps 2, 3 radially outwards and collects in the adjoining annular space 19. While at least part of the fiber suspension treated in this way leaves this annular space 19 through an outlet, the other part of the fiber suspension can under certain circumstances pass through the Grooves of the non-rotating grinding surface flow back through a section of their length.

Der Querschnitt der Mahlleisten, auch Messer genannt, ist im Allgemeinen rechteckig, wobei es aber auch andere Formen gibt. Die Oberseite dieser Mahlleisten, also die die Mahlkanten tragenden Flächen liegen in der Radialebene.The cross-section of the grinding bars, also known as knives, is generally rectangular, but there are also other shapes. The top of these grinding bars, that is to say the surfaces carrying the grinding edges, lie in the radial plane.

Die zwischen den Mahlleisten verlaufenden Nuten haben ebenfalls einen rechteckigen Querschnitt und dienen als Strömungskanäle für die Fasersuspension. Die Nuttiefe beträgt meist zwischen 2 und 20 mm.The grooves running between the grinding bars also have a rectangular cross section and serve as flow channels for the fiber suspension. The groove depth is usually between 2 and 20 mm.

Im Unterschied zu dem hier gezeigten Beispiel können der Behandlungsspalte 2,3 nicht nur senkrecht sondern wie bei Kegel-Refinern auch geneigt zur Rotationsachse 8 verlaufen.In contrast to the example shown here, the treatment gaps 2, 3 can run not only perpendicularly but also inclined to the axis of rotation 8, as in the case of cone refiners.

Angetrieben wird die Welle 9 von einem Antrieb über ein hier beispielhaft im Gehäuse 1 des Refiners vorhandenes Getriebe 17, in welches die Welle 9 hineinreicht.The shaft 9 is driven by a drive via a transmission 17 which is present here, for example, in the housing 1 of the refiner and into which the shaft 9 extends.

Zur Einstellung der Gesamtbreite beider Mahlspalte 2,3 ist eine nicht-rotierenden Grundplatte 6 mittels Spindelhubelement 16 axial verstellbar und die andere nicht-rotierende Grundplatte 6 mit dem Gehäuse 1 verbunden.To adjust the total width of the two grinding gaps 2, 3 a non-rotating base plate 6 is axially adjustable by means of a screw jack 16 and the other non-rotating base plate 6 is connected to the housing 1.

Da die rotierende Grundplatte 7 axial verschiebbar auf der Welle 9 angeordnet ist, gleicht diese den Druck zwischen beiden Mahlspalten 2,3 aus, so dass sich eine Veränderung der Gesamtbreite beider Mahlspalte 2,3 auch auf die einzelne Breite beider Mahlspalte 2,3 auswirkt.Since the rotating base plate 7 is axially displaceable on the shaft 9, it balances the pressure between the two grinding gaps 2, 3, so that a change in the total width of both grinding gaps 2, 3 also has an effect on the individual widths of both grinding gaps 2, 3.

Ist die axiale Verschiebbarkeit der rotierenden Grundplatte 7 auf der Welle 9 allerdings infolge Verschleiß oder tordierter Welle 9 behindert oder gar nicht möglich, so kann die rotierende Grundplatte 7 bei einer Verstellung der Gesamtbreite beider Mahlspalte 2,3 den Druck zwischen den beiden Mahlspalten 2,3 nicht mehr ausgleichen.If the axial displaceability of the rotating base plate 7 on the shaft 9 is hindered or not possible at all due to wear or a twisted shaft 9, the rotating base plate 7 can reduce the pressure between the two grinding gaps 2,3 when the total width of both grinding gaps 2,3 is adjusted no longer compensate.

Weil zur Verstellung der Gesamtbreite beider Mahlspalte 2,3 nur eine nicht-rotierende Grundplatte 6 axial verschoben wird, wirkt sich diese Verschiebung bei einer beschriebenen Störung auch nur auf den von dieser verschiebbaren Grundplatte 6 gebildeten Mahlspalt 2 aus. Im Ergebnis wird die Welle 9 mit einer entsprechenden axialen Kraft F belastet.Because only one non-rotating base plate 6 is axially displaced in order to adjust the total width of both grinding gaps 2, 3, this shift only has an effect on the grinding gap 2 formed by this displaceable base plate 6 in the event of a disturbance described. As a result, the shaft 9 is loaded with a corresponding axial force F.

Um Schaden durch diese axiale Kraft F abzuwenden, ist die Welle 9 gegen ein Kraftelement 12 in Form eines Federelementes axial verschiebbar gelagert.In order to avert damage caused by this axial force F, the shaft 9 is mounted so as to be axially displaceable against a force element 12 in the form of a spring element.

Auf diese Weise kann auf eine sonst übliche Überdimensionierung bei dem Axiallager 11 der Welle 9 verzichtet werden. Darüber hinaus verbessert das Kraftelement 12 den Rundlauf des Axiallagers 11.In this way, the otherwise customary oversizing of the axial bearing 11 of the shaft 9 can be dispensed with. In addition, the force element 12 improves the concentricity of the axial bearing 11.

Dabei wird die auf die Welle 9 einwirkende Axialkraft F mittels einer der Welle 9 zugeordneten Messeinheit 10 gemessen.The axial force F acting on the shaft 9 is measured by means of a measuring unit 10 assigned to the shaft 9.

Gemäß Figur 2 umfasst die Messeinheit 10 für die Axialkraft F ein auf der Welle 9 angeordnetes Axiallager 11, welches radial in einem mit dem Gehäuse 1 gekoppelten Lagergehäuse 15 fixiert ist.According to Figure 2 The measuring unit 10 for the axial force F comprises an axial bearing 11 which is arranged on the shaft 9 and which is fixed radially in a bearing housing 15 coupled to the housing 1.

Das Axiallager 11 wird dabei von dem, sich am Lagergehäuse 15 abstützenden Kraftelement 12 gegen einen in Richtung der zu messenden Axialkraft 7 weisenden Anschlag 13 der Welle 9 gedrückt wird, wobei ein Sensor 14 die relative, axiale Lage des Axiallagers 11 zum Lagergehäuse 15 und damit auch zum Gehäuse 1 des Refiners erfasst.The axial bearing 11 is pressed by the force element 12 supported on the bearing housing 15 against a stop 13 of the shaft 9 pointing in the direction of the axial force 7 to be measured, a sensor 14 recording the relative, axial position of the axial bearing 11 to the bearing housing 15 and thus also recorded for housing 1 of the refiner.

Als Sensor 14 können in dieser anspruchsvollen Umgebung insbesondere induktive Sensoren, Kraftmessdosen o.ä. eingesetzt werden.In particular, inductive sensors, load cells or the like can be used as sensor 14 in this demanding environment.

Da das Kraftelement 12 und die Axialkraft F entgegengesetzt wirken und sich somit ein Ausgleich einstellt, kann über die axiale Lage des Axiallagers 11 und die Parameter des Kraftelements 12 auf die Axialkraft F geschlossen werden.Since the force element 12 and the axial force F act in opposition and thus a compensation is established, conclusions can be drawn about the axial force F via the axial position of the axial bearing 11 and the parameters of the force element 12.

Im einfachen Fall einer Feder würde sich die Axialkraft F als Produkt von axialer Ortsverschiebung des Axiallagers 11 und der Federkonstante ergeben.In the simple case of a spring, the axial force F would result as the product of the axial displacement of the axial bearing 11 and the spring constant.

Um Schaden abzuwenden, kann so beim Überschreiten einer vorgegebenen Axialkraft F der Welle 9 die axiale Verschiebung der nicht-rotierenden Grundplatte 6 gestoppt oder bei einer sehr hohen Axialkraft F die Gesamtbreite der Mahlspalte 2,3 durch eine entsprechende axiale Verschiebung der nicht-rotierenden Grundplatte 6 vergrößert werden.In order to avert damage, the axial displacement of the non-rotating base plate 6 can be stopped when a predetermined axial force F of the shaft 9 is exceeded or, in the case of a very high axial force F, the total width of the grinding gaps 2, 3 can be stopped by a corresponding axial displacement of the non-rotating base plate 6 be enlarged.

Außerdem kann im Falle eines stetigen Anstiegs der Axialkraft F während des Betriebs bei der Steuerung der Vorrichtung auf einen Verschleiß der Verbindung zwischen rotierender Grundplatte 7 und Welle 9 geschlossen werden.In addition, in the event of a steady increase in the axial force F during operation, when controlling the device, it can be concluded that the connection between the rotating base plate 7 and the shaft 9 is worn.

Die Behandlungsintensität des Faserstoffs, d.h. hier die Mahlleistung wird im Wesentlichen von der spezifischen Antriebsleistung des Refiners bestimmt.The treatment intensity of the pulp, i.e. the grinding capacity in this case, is essentially determined by the specific drive power of the refiner.

Daher wird die Breite des Behandlungsspaltes 6 so eingestellt, dass sich eine dem zu behandelnden Faserstoff sowie den gewünschten Parametern des Faserstoffs nach der Behandlung entsprechende optimale Axialkraft F ergibt.The width of the treatment gap 6 is therefore set in such a way that an optimal axial force F corresponding to the fibrous material to be treated and the desired parameters of the fibrous material after the treatment results.

Claims (10)

  1. Device for treating fibrous material, comprising two refining gaps (2, 3) which are arranged in a housing (1) and through which fibrous material flows radially, which are each formed by a treatment tool (5) rotating about an axis of rotation (8) and a non-rotating treatment tool (4), wherein the treatment tools (4, 5) are each fixed to a base plate (6, 7), have a rotationally symmetrical shape and are arranged coaxially with respect to each other, the two rotating treatment tools (5) are fixed to a common base plate (7) driven by a rotatably mounted shaft (9) and are arranged between the two non-rotating treatment tools (4), the rotating base plate (7) is axially displaceably fixed to the shaft (9) and the width of the refining gaps (2, 3) can be varied via an axial displacement of at least one non-rotating base plate (6), characterized in that the shaft (9) is assigned a measuring unit (10) for detecting the axial force (F) acting on the shaft (9).
  2. Device according to Claim 1, characterized in that the shaft (9) is mounted such that it can be displaced axially against a force element (12).
  3. Device according to Claim 1 or 2, characterized in that the measuring unit (10) comprises an axial bearing (11) which is arranged on the shaft (9) and which is pressed by a force element (12) supported on the housing (1) against a stop (13) on the shaft (9) which points in the direction of the axial force (F) to be measured, wherein a sensor (14) detects the relative axial position of the axial bearing (11) relative to the housing (1).
  4. Device according to Claim 3, characterized in that the axial bearing (11) is guided radially in a bearing housing (15) coupled to the housing (1).
  5. Device according to one of the preceding claims, characterized in that the axial adjustment of the non-rotating base plate (6) is carried out by means of a screw jack (16).
  6. Device according to one of the preceding claims, characterized in that one non-rotating base plate (6) is axially adjustable by means of the screw jack (16), and the other non-rotating base plate (6) is coupled to the housing (1).
  7. Device according to one of the preceding claims, characterized in that the shaft (9) is guided into a gear mechanism (17) coupled to a drive.
  8. Method for operating a device according to one of the preceding claims, characterized in that when a predefined axial force (F) of the shaft (9) is exceeded, the axial displacement of the non-rotating base plate (6) is stopped.
  9. Method for operating a device according to one of Claims 1 to 7, characterized in that when a predefined axial force (F) of the shaft (9) is exceeded, the width of the refining gap (2, 3) is enlarged by a corresponding axial displacement of the non-rotating base plate (6).
  10. Method for operating a device according to one of Claims 1 to 7, characterized in that if there is a continuous rise in the axial force (F) during operation during the control of the device, it is concluded that there is wear of the connection between the rotating base plate (7) and the shaft (9).
EP18789573.5A 2017-11-24 2018-10-11 Grinding device Active EP3714098B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017127772.2A DE102017127772A1 (en) 2017-11-24 2017-11-24 grinder
PCT/EP2018/077681 WO2019101424A1 (en) 2017-11-24 2018-10-11 Grinding device

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EP3714098A1 EP3714098A1 (en) 2020-09-30
EP3714098B1 true EP3714098B1 (en) 2021-11-17

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EP18789573.5A Active EP3714098B1 (en) 2017-11-24 2018-10-11 Grinding device

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EP (1) EP3714098B1 (en)
CN (1) CN111373091B (en)
DE (1) DE102017127772A1 (en)
WO (1) WO2019101424A1 (en)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3323731A (en) * 1963-07-01 1967-06-06 Defibrator Ab Grinding apparatus primarily for lignocellulose containing material
DE1246370B (en) * 1964-04-11 1967-08-03 Voith Gmbh J M Mill, especially for processing fiber materials
FI51512C (en) * 1975-09-09 1977-01-10 Yhtyneet Paperitehtaat Oy Method and device for parallel adjustment of grinding wheels in a grinding device for abrasive pulp.
DE3743777A1 (en) * 1987-12-23 1989-07-06 Felder Industrietechnik Gmbh Disc refiner
US4986480A (en) * 1989-06-29 1991-01-22 Kamyr Ab Method and apparatus for feeding a conical refiner
EP1021248B1 (en) * 1997-10-09 2005-12-28 Kadant Black Clawson Inc. Paper pulp refiner control system and method
GB2331469A (en) * 1997-11-25 1999-05-26 Univ Bradford Pulp refiner
US6053440A (en) * 1999-03-02 2000-04-25 Beloit Technologies, Inc. Tangential discharge disk refiner
US6752165B2 (en) * 2000-03-08 2004-06-22 J & L Fiber Services, Inc. Refiner control method and system
AU2001242150A1 (en) * 2000-03-15 2001-09-24 Pulp And Paper Research Institute Of Canada Refiner force sensor
SE521848C2 (en) * 2002-04-02 2003-12-09 Metso Paper Inc Method and apparatus for measuring power stress at refiners
DE202006002999U1 (en) * 2006-02-24 2007-06-28 Voith Paper Patent Gmbh Disc refiner for grinding suspended fibrous materials comprises a rotor and stators, each having grinding tools that cooperate to form a conical grinding zone

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DE102017127772A1 (en) 2019-05-29
EP3714098A1 (en) 2020-09-30
CN111373091A (en) 2020-07-03
CN111373091B (en) 2022-07-15
WO2019101424A1 (en) 2019-05-31

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