EP3041609B1 - Turning disc mill and method of operating a turning disc mill - Google Patents

Turning disc mill and method of operating a turning disc mill Download PDF

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Publication number
EP3041609B1
EP3041609B1 EP14758093.0A EP14758093A EP3041609B1 EP 3041609 B1 EP3041609 B1 EP 3041609B1 EP 14758093 A EP14758093 A EP 14758093A EP 3041609 B1 EP3041609 B1 EP 3041609B1
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EP
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Prior art keywords
milling
vessel
grinding
magnetic field
disc mill
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EP14758093.0A
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German (de)
French (fr)
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EP3041609A1 (en
Inventor
Michael Wilczek
Jürgen Schneberger
Reinhard Teutenberg
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ThyssenKrupp Industrial Solutions AG
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ThyssenKrupp Industrial Solutions AG
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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
    • B02C15/10—Mills with balls or rollers centrifugally forced against the inner surface of a ring, the balls or rollers of which are driven by other means than a centrally-arranged member

Definitions

  • the invention relates to a vibrating disk mill and a method for operating a vibrating disk mill.
  • a conventional vibrating disc mill is, for example, from DE 43 43 742 C2 known, in which a mill vessel is arranged in a vibratory manner in a mill housing and a loose grinding stone is provided inside the mill vessel.
  • the grinding vessel is set in an oscillating movement via an eccentric drive device, with a relative movement between the grinding vessel and the grinding stone.
  • the material to be crushed is crushed between the grinding stone and the wall of the grinding vessel.
  • the drive device requires several bearings and belts for coupling to the drive, which must be replaced regularly.
  • the three-phase motor required for the drive requires a relatively large amount of space.
  • a reduced coefficient of friction between the grinding stone and the grinding vessel can result in the relative movement of the grinding stone on the grinding vessel or the grinding stone grinding on the grinding vessel resulting in increased wear and tear and a shorter service life.
  • the JP 2007 229701 A discloses a mill according to the preamble of claim 1, in which a rotating magnetic field causes a movement of a grinding tool.
  • a magnetic pressing device is provided for setting the contact pressure between the grinding tool and a base of the grinding vessel.
  • a spherical grinding tool is moved in a grinding vessel with the aid of a rotating magnetic field.
  • a device for raw and material preparation in which the material to be shredded is passed through a hollow body, which has a positive and a negative magnetic pole or a row or chain of such poles on opposite sides.
  • a hollow body In the interior of the hollow body there are magnetizable molded bodies, preferably spheres are free to move.
  • An alternating switching of the magnetic field can force the ball to swing up and down or swing back and forth in the hollow body, with the material to be comminuted being shattered by the balls.
  • this type of comminution is associated with a high level of noise.
  • the invention is based on the object of specifying a drive for a vibrating mill which is characterized by a small footprint and which reduces the noise generated by the vibrating mill in the grinding area.
  • the vibrating mill has a grinding vessel, at least one grinding tool movable in the grinding vessel with a magnetic or magnetizable component and an excitation system for generating a magnetic field, the magnetic field causing the at least one grinding tool to move.
  • the excitation system is arranged around the grinding vessel and designed to generate a rotating magnetic field, a magnetic pressing device being provided for setting the pressure between the grinding tool and a base of the grinding vessel.
  • the grinding tool has a core and at least one jacket made of a wear-resistant material surrounding the core.
  • a grinding tool with a core and at least one casing made of a wear-resistant material surrounding the core is used, the grinding tool with a magnetic or magnetizable component being moved by a magnetic field in a grinding vessel and the magnetic field as a rotating magnetic field is generated. Furthermore, the contact pressure between the grinding tool and the base of the grinding vessel is set by means of a magnetic pressure device.
  • moving elements in the drive system can be dispensed with, so that components susceptible to wear, such as bearings and drive belts, are omitted.
  • the maintenance of the vibrating disk mill can therefore be expected to be significantly lower.
  • the vibrating disc mill can be made more compact, so that the grinding chamber and thus also the grinding tool can be made larger with the same amount of space. This leads to a higher horizontal force during the shredding.
  • the grinding force can be individually adapted to the grinding task by means of the magnetic pressure device.
  • the contact pressure can be changed via the strength of the effective magnetic field.
  • the grinding vessel has a top, a bottom and a peripheral wall, the excitation system being arranged in the area of the peripheral wall and / or in the area of the top and / or bottom of the grinding vessel.
  • the grinding vessel preferably has a cylindrical peripheral wall and the grinding tool can be designed as a grinding disk.
  • the excitation system for generating the circulating magnetic field preferably has a plurality of separately controllable excitation coils which are controlled by a control device.
  • the grinding tool comprises one, preferably two to four or more pole pairs.
  • the mill vessel is expediently arranged in a rigid manner so that bearings and balancing weights can be dispensed with.
  • the rotating magnetic field is generated, for example, by means of several excitation coils arranged around the grinding vessel, in that successive excitation coils are subjected to currents shifted in their phase.
  • the grinding tool If the grinding tool is disc-shaped, it rolls off the circumferential wall of the grinding vessel due to the rotating magnetic field. The crushing takes place both between the circumferential wall of the mill housing and the grinding disk and below the grinding disk, the coarse grinding of the grinding material taking place in the gap between the circumferential wall and grinding disk until the material reaches particle sizes that are fine enough to get under the grinding disk. There, the fine particles are crushed further by a combination of weight and shear. While in conventional vibratory disc mills, only the weight of the grinding disc acts in this area, according to the invention the grinding pressure can be changed by a magnetic field and adapted to the material to be ground.
  • the vibrating disc mill comprises a device for determining the position of the grinding tool in the grinding vessel.
  • a device for determining the position of the grinding tool in the grinding vessel can include, for example, a measuring device for measuring the magnetic flux and / or the magnetic return flow and / or the induction voltage of the excitation system, such as a Hall probe or an induction coil arranged in the magnetic field of the excitation system.
  • the movement of the grinding tool in the grinding vessel creates a change in the magnetic field of the excitation system.
  • a measurement of the magnetic flux and / or the magnetic return flux and / or the induction voltage therefore enables a conclusion to be drawn about the position of the grinding tool in the grinding vessel. It is also conceivable to determine the rotational speed of the grinding tool in the grinding vessel from the determined positions of the grinding tool in the grinding vessel.
  • the device for determining the position of the grinding tool in the grinding vessel is designed, for example, in such a way that it is connected to the control device of the excitation system.
  • the device for determining the position of the grinding tool transmits the position and / or the speed of the grinding tool in the grinding vessel to the control device of the Excitation system. This enables the excitation system to be controlled as a function of the speed of the grinding tool in the grinding vessel.
  • the vibrating disc mill shown has a grinding housing 1 in which a grinding vessel 2 is held by means of a holder 3.
  • the grinding vessel 2 is cylindrical, the diameter in the illustrated embodiment being at least 3 times its height.
  • the grinding vessel is delimited by a cylindrical peripheral wall 2a, a ceiling 2b and a floor 2c.
  • In the ceiling 2b opens a grinding feed line 4 for the supply of Grist, while an outlet valve 5 is provided for the ground grist in the area of the bottom 2c.
  • the outlet valve 5 interacts with a pneumatically controlled discharge system 6 and an adjoining ground material discharge line 7.
  • a disk-shaped grinding tool 8 is arranged, which has a core 8a and a casing 8b surrounding the core made of a wear-resistant material.
  • the grinding vessel 1 is supported on a foundation 10 via damping elements 9.
  • an excitation system 11 which has a plurality of coils 11a, 11b, 11c, 11d, ..., which are evenly distributed on the Outside of the grinding vessel are arranged in the area of the peripheral wall 2a (see Figures 2a, 2b ).
  • the grinding tool 8 in particular its core, has a magnetic or magnetizable component, which in the illustrated embodiment is formed by four pairs of poles 8a, 8b, 8c, 8d.
  • the excitation coils 11a, 11b,..., Can be controlled separately via a control device not shown in detail.
  • a cleverly selected phase shift of the currents in the respective windings creates a rotating magnetic field that causes a rolling movement of the grinding tool 8 on the circumferential wall 2a of the grinding vessel 2, like that from the Figures 2a and 2b can be seen.
  • Figures 2a and 2b show the situations at times A and B.
  • the ground material supplied via the grinding material supply line 4 is initially coarsely comminuted between the grinding tool 8 and the peripheral wall 2a until the material reaches particle sizes that are fine enough to get into the area between the grinding tool 8 and To get to floor 2c. There the fine particles are comminuted further by a combination of weight and shear before the material is discharged via the outlet valve 5 and the pneumatically controlled discharge system 6 and the grist discharge line 7.
  • the grinding vessel is fixed here.
  • the rigid arrangement of the grinding jar increases the speed of the painting tool allows, since no thrust bearings limiting the speed need to be provided.
  • the drive concept of the vibrating disc mill is essentially based on the principle of a permanent magnet motor, which belongs to synchronous machines. The only difference is that the runner (in this case the grinding tool 8) is not fixed in the central axis, but can move freely in the grinding chamber.
  • the individual segments of the external excitation windings are activated in such a way that a rotating magnetic field is created that sets the grinding tool in rotation through alternating polarization. Overall, the excitation leads to the disk-shaped grinding tool rolling on the peripheral wall 2c of the grinding vessel 2.
  • the illustrated second embodiment differs from the embodiment of FIG Fig. 1 only by its excitation system 11 ', which in turn is formed by a large number of separately controllable excitation coils 11'a, 11'b, 11'c, 11'd, ..., but which are in the area of the top 2b and bottom 2c of the grinding vessel 2 are arranged.
  • radial drive concept in the embodiment according to Fig. 3 realized an axial drive concept.
  • the control is sequential, so that a rotating magnetic field is created around the center axis of the grinding vessel, so that the disc-shaped grinding tool 8 moves as a rotating mass on a circular path will (see Fig. 4 ).
  • a magnetic pressing device 12 is provided for setting the contact pressure between the grinding tool 8 and the base 2c of the grinding vessel 2 ( Figures 5a, 5b ).
  • a magnetizable core or permanent magnet 8g is provided in the interior of the grinding tool 8, which cooperates with a ring magnet 12a.
  • the ring magnet is arranged exactly on the circular path that is the center of the disk-shaped Grinding tool 8 executes during its rotation in the grinding vessel 2.
  • the strength of the effective magnetic field of the pressing device 12 can expediently be adapted to the comminution task. This can take place, for example, in that the distance between the ring magnet 12 and the base 2c of the grinding vessel is changed or the strength of the magnetic field is electrically adjustable.
  • the ones in the Figures 5a and 5b The training shown is especially for the in Fig. 1 illustrated first embodiment suitable.
  • the generation of the additional contact pressure can also be realized by the already existing excitation system 11 ', in that the excitation coils in the area of the ceiling 2b are controlled with different strengths than the coils in the area of the floor 2c.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

Die Erfindung betrifft eine Scheibenschwingmühle und ein Verfahren zum Betreiben einer Scheibenschwingmühle.The invention relates to a vibrating disk mill and a method for operating a vibrating disk mill.

Eine herkömmliche Scheibenschwingmühle ist beispielsweise aus der DE 43 43 742 C2 bekannt, bei der ein Mühlengefäß schwingbeweglich in einem Mühlengehäuse angeordnet ist und innerhalb des Mühlengefäßes ein loser darin beweglicher Mahlstein vorgesehen ist. Über eine Exzenter-Antriebseinrichtung wird das Mahlgefäß in eine Schwingbewegung versetzt, wobei es zu einer Relativbewegung zwischen Mahlgefäß und Mahlstein kommt. Das zu zerkleinernde Material wird dabei zwischen dem Mahlstein und der Wandung des Mahlgefäßes zerkleinert. Die Antriebseinrichtung benötigt aber mehrere Lager und Riemen für die Kopplung zum Antrieb, die regelmäßig ausgetauscht werden müssen. Außerdem benötigt der für den Antrieb erforderliche Drehstrommotor relativ viel Platz. Des Weiteren kann ein verminderter Reibkoeffizienten zwischen dem Mahlstein und dem Mahlgefäß dazu führen, dass dir Relativbewegung des Mahlsteins auf dem Mahlgefäß aussetzt oder es zu einem Schleifen des Mahlsteins auf dem Mahlgefäß kommt, wodurch dieser einen erhöhten Verschleiß und eine geringere Lebensdauer erfährt.A conventional vibrating disc mill is, for example, from DE 43 43 742 C2 known, in which a mill vessel is arranged in a vibratory manner in a mill housing and a loose grinding stone is provided inside the mill vessel. The grinding vessel is set in an oscillating movement via an eccentric drive device, with a relative movement between the grinding vessel and the grinding stone. The material to be crushed is crushed between the grinding stone and the wall of the grinding vessel. The drive device, however, requires several bearings and belts for coupling to the drive, which must be replaced regularly. In addition, the three-phase motor required for the drive requires a relatively large amount of space. Furthermore, a reduced coefficient of friction between the grinding stone and the grinding vessel can result in the relative movement of the grinding stone on the grinding vessel or the grinding stone grinding on the grinding vessel resulting in increased wear and tear and a shorter service life.

Die JP 2007 229701 A offenbart eine Mühle gemäß dem Oberbegriff des Anspruchs 1, bei der ein umlaufendes Magnetfeld eine Bewegung eines Mahlwerkzeuges hervorruft. Dabei ist eine magnetische Anpresseinrichtung zur Einstellung des Anpressdrucks zwischen Mahlwerkzeug und einem Boden des Mahlgefäßes vorgesehen. In der US 1 894 106 A wird in einem Mahlgefäß ein kugelförmig ausgebildetes Mahlwerkzeug mit Hilfe eines rotierenden Magnetfeldes bewegt.The JP 2007 229701 A discloses a mill according to the preamble of claim 1, in which a rotating magnetic field causes a movement of a grinding tool. A magnetic pressing device is provided for setting the contact pressure between the grinding tool and a base of the grinding vessel. In the U.S. 1,894,106 A a spherical grinding tool is moved in a grinding vessel with the aid of a rotating magnetic field.

In der DD 148 189 wird eine Vorrichtung zur Roh- und Werkstoffaufbereitung beschrieben, bei der das zu zerkleinernde Material durch einen Hohlkörper geleitet wird, der auf gegenüberliegende Seiten je einen positiven und einen negativen Magnetpol oder eine Reihe oder Kette derartige Pole aufweist. Im Inneren des Hohlkörpers befinden sich magnetisierbare Formkörper, vorzugsweise Kugeln, die freibeweglich sind. Durch eine Wechselschaltung des Magnetfeldes kann ein Auf- und Abschwingen oder ein Hin- und Herschwingen der Kugel im Hohlkörper erzwungen werden, wobei das zu zerkleinernde Material von den Kugeln zertrümmert wird. Diese Art der Zerkleinerung ist jedoch mit einer hohen Geräuschentwicklung verbunden.In the DD 148 189 a device for raw and material preparation is described in which the material to be shredded is passed through a hollow body, which has a positive and a negative magnetic pole or a row or chain of such poles on opposite sides. In the interior of the hollow body there are magnetizable molded bodies, preferably spheres are free to move. An alternating switching of the magnetic field can force the ball to swing up and down or swing back and forth in the hollow body, with the material to be comminuted being shattered by the balls. However, this type of comminution is associated with a high level of noise.

Der Erfindung liegt die Aufgabe zugrunde, einen Antrieb für eine Schwingmühle anzugeben, der sich durch einen geringen Raumbedarf auszeichnet und die Geräuschentwicklung der Schwingmühle im Mahlbereich reduziert.The invention is based on the object of specifying a drive for a vibrating mill which is characterized by a small footprint and which reduces the noise generated by the vibrating mill in the grinding area.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale der Ansprüche 1 und 8 gelöst.According to the invention, this object is achieved by the features of claims 1 and 8.

Die erfindungsgemäße Schwingmühle weist ein Mahlgefäß, wenigstens ein im Mahlgefäß bewegliches Mahlwerkzeug mit einem magnetischen oder magnetisierbaren Bestandteil und ein Erregersystem zur Erzeugung eines Magnetfelds auf, wobei das Magnetfeld eine Bewegung des wenigstens einen Mahlwerkzeuges hervorruft. Das Erregersystem ist dabei um das Mahlgefäß angeordnet und zur Erzeugung eines umlaufenden Magnetfeldes ausgebildet, wobei eine magnetische Anpresseinrichtung zur Einstellung des Anpressdrucks zwischen Mahlwerkzeug und einem Boden des Mahlgefäßes vorgesehen ist. Weiterhin weist das Mahlwerkzeug einen Kern und zumindest eine, den Kern umgebende Ummantelung aus einem verschleißfesten Material auf.The vibrating mill according to the invention has a grinding vessel, at least one grinding tool movable in the grinding vessel with a magnetic or magnetizable component and an excitation system for generating a magnetic field, the magnetic field causing the at least one grinding tool to move. The excitation system is arranged around the grinding vessel and designed to generate a rotating magnetic field, a magnetic pressing device being provided for setting the pressure between the grinding tool and a base of the grinding vessel. Furthermore, the grinding tool has a core and at least one jacket made of a wear-resistant material surrounding the core.

Beim erfindungsgemäßen Verfahren zum Betreiben einer Scheibenschwingmühle kommt ein Mahlwerkzeug mit einem Kern und zumindest einer, den Kern umgebende Ummantelung aus einem verschleißfesten Material zur Anwendung, wobei das Mahlwerkzeug mit einem magnetischen oder magnetisierbaren Bestandteil durch ein Magnetfeld in einem Mahlgefäß bewegt wird und das Magnetfeld als ein umlaufendes Magnetfeld erzeugt wird. Weiterhin wird der Anpressdruck zwischen dem Mahlwerkzeug und dem Boden des Mahlgefäßes mittels einer magnetischen Anpresseinrichtung eingestellt.In the method according to the invention for operating a vibrating disc mill, a grinding tool with a core and at least one casing made of a wear-resistant material surrounding the core is used, the grinding tool with a magnetic or magnetizable component being moved by a magnetic field in a grinding vessel and the magnetic field as a rotating magnetic field is generated. Furthermore, the contact pressure between the grinding tool and the base of the grinding vessel is set by means of a magnetic pressure device.

Mit dem erfindungsgemäßen Erregersystem kann auf bewegte Elemente im Antriebssystem verzichtet werden, sodass verschleißanfällige Bauteile, wie Lager und Antriebsriemen, entfallen. Es ist daher mit deutlich niedrigeren Kosten bei der Wartung der Scheibenschwingmühle zu rechnen. Darüber hinaus kann die Scheibenschwingmühle kompakter gebaut werden, sodass der Mahlraum und damit auch das Mahlwerkzeug bei gleichem Platzangebot größer ausgeführt werden kann. Dies führt zu einer höheren Horizontalkraft bei der Zerkleinerung. Weiterhin besteht die Möglichkeit, die erfindungsgemäße Scheibenschwingmühle bei Bedarf mit höheren Drehzahlen zu betreiben als dies bei herkömmlichen Scheibenschwingmühlen mit Exzenterantrieb möglich war.With the excitation system according to the invention, moving elements in the drive system can be dispensed with, so that components susceptible to wear, such as bearings and drive belts, are omitted. The maintenance of the vibrating disk mill can therefore be expected to be significantly lower. In addition, the vibrating disc mill can be made more compact, so that the grinding chamber and thus also the grinding tool can be made larger with the same amount of space. This leads to a higher horizontal force during the shredding. Furthermore, there is the possibility of operating the vibratory disk mill according to the invention, if required, at higher speeds than was possible with conventional vibratory disk mills with an eccentric drive.

Mittels der magnetischen Anpresseinrichtung kann die Mahlkraft individuell an die Zerkleinerungsaufgabe angepasst werden. Der Anpressdruck kann dabei über die Stärke des wirksamen Magnetfeldes verändert werden.The grinding force can be individually adapted to the grinding task by means of the magnetic pressure device. The contact pressure can be changed via the strength of the effective magnetic field.

Weitere Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Further refinements of the invention are the subject of the subclaims.

Gemäß einer bevorzugten Ausgestaltung der Erfindung weist das Mahlgefäß eine Decke, einen Boden und eine Umfangswand auf, wobei das Erregersystem im Bereich der Umfangswand und/oder im Bereich von Decke und/oder Boden des Mahlgefäßes angeordnet ist. Das Mahlgefäß weist vorzugsweise eine zylindrische Umfangswand auf und das Mahlwerkzeug kann als Mahlscheibe ausgebildet sein. Das Erregersystem zur Erzeugung des umlaufenden Magnetfelds weist vorzugsweise eine Vielzahl von separat ansteuerbaren Erregerspulen auf, die durch eine Steuereinrichtung angesteuert werden. Das Mahlwerkzeug umfasst ein, vorzugsweise zwei bis vier oder mehrere Polpaare. Zweckmäßigerweise wird das Mühlengefäß starr angeordnet, sodass auf Lager und Ausgleichsgewichte verzichtet werden kann.According to a preferred embodiment of the invention, the grinding vessel has a top, a bottom and a peripheral wall, the excitation system being arranged in the area of the peripheral wall and / or in the area of the top and / or bottom of the grinding vessel. The grinding vessel preferably has a cylindrical peripheral wall and the grinding tool can be designed as a grinding disk. The excitation system for generating the circulating magnetic field preferably has a plurality of separately controllable excitation coils which are controlled by a control device. The grinding tool comprises one, preferably two to four or more pole pairs. The mill vessel is expediently arranged in a rigid manner so that bearings and balancing weights can be dispensed with.

Das umlaufende Magnetfeld wird beispielsweise mittels mehrerer um das Mahlgefäß angeordneter Erregerspulen dadurch erzeugt, dass aufeinanderfolgende Erregerspulen mit in ihrer Phase verschobenen Strömen beaufschlagt werden. Ist das Mahlwerkzeug scheibenförmig ausgebildet, rollt es durch das umlaufende Magnetfeld an der Umfangswand des Mahlgefäßes ab. Die Zerkleinerung findet dabei sowohl zwischen der Umfangswand des Mühlengehäuses und der Mahlscheibe als auch unterhalb der Mahlscheibe statt, wobei im Spalt zwischen Umfangswand und Mahlscheibe die Grobzerkleinerung des Mahlgutes erfolgt, bis das Material Partikelgrößen erreicht, die fein genug sind, um unter die Mahlscheibe zu gelangen. Dort werden die feinen Partikel durch eine Kombination aus Gewichtskraft und Scherung weiter zerkleinert. Während bei herkömmlichen Scheibenschwingmühlen, in diesem Bereich nur die Gewichtskraft der Mahlscheibe wirkt, kann gemäß der Erfindung der Mahldruck durch ein magnetisches Feld verändert und an das Mahlgut angepasst werden.The rotating magnetic field is generated, for example, by means of several excitation coils arranged around the grinding vessel, in that successive excitation coils are subjected to currents shifted in their phase. If the grinding tool is disc-shaped, it rolls off the circumferential wall of the grinding vessel due to the rotating magnetic field. The crushing takes place both between the circumferential wall of the mill housing and the grinding disk and below the grinding disk, the coarse grinding of the grinding material taking place in the gap between the circumferential wall and grinding disk until the material reaches particle sizes that are fine enough to get under the grinding disk. There, the fine particles are crushed further by a combination of weight and shear. While in conventional vibratory disc mills, only the weight of the grinding disc acts in this area, according to the invention the grinding pressure can be changed by a magnetic field and adapted to the material to be ground.

Erfindungsgemäß umfasst die Scheibenschwingmühle eine Einrichtung zum Bestimmen der Position des Mahlwerkzeuges in dem Mahlgefäß. Eine solche Einrichtung kann beispielsweise auf der Innenseite des Mahlgefäßes, zwischen dem Mahlgefäß und dem Mahlwerkzeug angeordnet sein. Die Einrichtung zum Bestimmen der Position des Mahlwerkzeuges in dem Mahlgefäß kann beispielsweise eine Messeinrichtung zum Messen des Magnetflusses und / oder des Magnetrückfluss und / oder der Induktionsspannung des Erregersystems umfassen, wie beispielsweise eine Hallsonde oder eine in dem Magnetfeld des Erregersystems angeordnete Induktionsspule. Die Bewegung des Mahlwerkzeuges in dem Mahlgefäß erzeugt eine Änderung des Magnetfeldes des Erregersystems. Eine Messung des Magnetflusses und / oder des Magnetrückflusses und / oder der Induktionsspannung ermöglicht daher einen Rückschluss auf die Position des Mahlwerkzeuges in dem Mahlgefäß. Es ist des Weiteren denkbar, aus den ermittelten Positionen des Mahlwerkzeuges in dem Mahlgefäß die Drehzahl des Mahlwerkzeuges in dem Mahlgefäß zu ermitteln.According to the invention, the vibrating disc mill comprises a device for determining the position of the grinding tool in the grinding vessel. Such a device can for example be arranged on the inside of the grinding vessel, between the grinding vessel and the grinding tool. The device for determining the position of the grinding tool in the grinding vessel can include, for example, a measuring device for measuring the magnetic flux and / or the magnetic return flow and / or the induction voltage of the excitation system, such as a Hall probe or an induction coil arranged in the magnetic field of the excitation system. The movement of the grinding tool in the grinding vessel creates a change in the magnetic field of the excitation system. A measurement of the magnetic flux and / or the magnetic return flux and / or the induction voltage therefore enables a conclusion to be drawn about the position of the grinding tool in the grinding vessel. It is also conceivable to determine the rotational speed of the grinding tool in the grinding vessel from the determined positions of the grinding tool in the grinding vessel.

Die Einrichtung zum Bestimmen der Position des Mahlwerkzeuges in dem Mahlgefäß ist beispielsweise derart ausgebildet, dass sie mit der Steuereinrichtung des Erregersystems in Verbindung steht. Vorzugsweise übermittelt die Einrichtung zum Bestimmen der Position des Mahlwerkzeuges die Position und / oder die Drehzahl des Mahlwerkzeuges in dem Mahlgefäß an die Steuereinrichtung des Erregersystems. Dies ermöglicht eine Steuerung des Erregersystems in Abhängigkeit der Drehzahl des Mahlwerkzeuges in dem Mahlgefäß.The device for determining the position of the grinding tool in the grinding vessel is designed, for example, in such a way that it is connected to the control device of the excitation system. Preferably, the device for determining the position of the grinding tool transmits the position and / or the speed of the grinding tool in the grinding vessel to the control device of the Excitation system. This enables the excitation system to be controlled as a function of the speed of the grinding tool in the grinding vessel.

Weitere Vorteile und Ausgestaltungen der Erfindung werden anhand der folgenden Beschreibung und der Zeichnung näher erläutert.Further advantages and embodiments of the invention are explained in more detail with reference to the following description and the drawing.

In der Zeichnung zeigen

Fig. 1
eine Scheibenschwingmühle mit einem im Bereich der Umfangswand angeordneten Erregersystem,
Fig. 2a
eine schematische Darstellung des Erregersystems und des Mahlwerkzeugs zum Zeitpunkt A,
Fig. 2b
eine schematische Darstellung des Erregersystems und des Mahlwerkzeugs zum Zeitpunkt B,
Fig. 2c
ein Stromzeitdiagramm zur Ansteuerung der Spulen der Fig. 2a, 2b,
Fig. 3
eine Scheibenschwingmühle mit einem im Bereich der Decke und des Bodens angeordneten Erregersystem,
Fig. 4
eine schematische Darstellung des Erregersystems und des Mahlwerkzeugs gemäß dem Ausführungsbeispiel gemäß Fig. 3,
Fig. 5a
schematische Seitenansicht einer Scheibenschwingmühle mit einer magnetischen Anpresseinrichtung und
Fig. 5b
eine Unteransicht der Scheibenschwingmühle gemäß Fig. 5a.
Show in the drawing
Fig. 1
a vibrating disc mill with an excitation system arranged in the area of the peripheral wall,
Fig. 2a
a schematic representation of the excitation system and the grinding tool at time A,
Figure 2b
a schematic representation of the excitation system and the grinding tool at time B,
Figure 2c
a current timing diagram for controlling the coils of the Figures 2a, 2b ,
Fig. 3
a vibrating disc mill with an excitation system arranged in the area of the ceiling and the floor,
Fig. 4
a schematic representation of the excitation system and the grinding tool according to the embodiment according to FIG Fig. 3 ,
Figure 5a
schematic side view of a vibrating disc mill with a magnetic pressing device and
Figure 5b
a bottom view of the vibrating disc mill according to Figure 5a .

Die in Fig. 1 dargestellte Scheibenschwingmühle weist ein Mahlgehäuse 1 auf, in dem ein Mahlgefäß 2 mittels einer Halterung 3 gehaltert ist. Das Mahlgefäß 2 ist zylindrisch ausgebildet, wobei der Durchmesser im dargestellten Ausführungsbeispiel wenigstens das 3-fache seiner Höhe beträgt. Das Mahlgefäß wird durch eine zylindrische Umfangswand 2a, eine Decke 2b und einen Boden 2c begrenzt. In der Decke 2b mündet eine Mahlgutzuleitung 4 zur Zuführung von Mahlgut, während im Bereich des Bodens 2c ein Auslassventil 5 für das gemahlene Mahlgut vorgesehen ist. Das Auslassventil 5 wirkt mit einem pneumatisch gesteuerten Austragssystem 6 und eine sich daran anschließenden MahlgutAustragsleitung 7 zusammen. Im Inneren des Mahlgefäßes 2 ist ein scheibenförmiges Mahlwerkzeug 8 angeordnet, dass einen Kern 8a und eine den Kern umgebende Ummantelung 8b aus einem verschleißfesten Material aufweist. Das Mahlgefäß 1 stützt sich über Dämpfungselemente 9 auf einem Fundament 10 ab.In the Fig. 1 The vibrating disc mill shown has a grinding housing 1 in which a grinding vessel 2 is held by means of a holder 3. The grinding vessel 2 is cylindrical, the diameter in the illustrated embodiment being at least 3 times its height. The grinding vessel is delimited by a cylindrical peripheral wall 2a, a ceiling 2b and a floor 2c. In the ceiling 2b opens a grinding feed line 4 for the supply of Grist, while an outlet valve 5 is provided for the ground grist in the area of the bottom 2c. The outlet valve 5 interacts with a pneumatically controlled discharge system 6 and an adjoining ground material discharge line 7. In the interior of the grinding vessel 2, a disk-shaped grinding tool 8 is arranged, which has a core 8a and a casing 8b surrounding the core made of a wear-resistant material. The grinding vessel 1 is supported on a foundation 10 via damping elements 9.

Damit das Mahlwerkzeug 8 in bekannter Art und Weise während des Mahlvorganges an der Umfangswand 2a des Mahlgefäßes 2 abrollt, ist ein Erregersystem 11 vorgesehen, das eine Vielzahl von Spulen 11a, 11b, 11c, 11d, ... aufweist, die gleichmäßig verteilt auf der Außenseite des Mahlgefäßes im Bereich der Umfangswand 2a angeordnet sind (siehe Fig. 2a, 2b). Das Mahlwerkzeug 8, insbesondere sein Kern, weist einen magnetischen oder magnetisierbaren Bestandteil auf, der im dargestellten Ausführungsbeispiel durch vier Polpaare 8a, 8b, 8c, 8d gebildet wird. Über eine nicht näher dargestellte Steuereinrichtung können die Erregerspulen 11a, 11b, ..., separat angesteuert werden. Durch eine geschickt gewählte Phasenverschiebung der Ströme in den jeweiligen Wicklungen (siehe Fig. 2c) entsteht ein umlaufendes Magnetfeld, dass eine Abrollbewegung des Mahlwerkzeuges 8 an der Umfangswand 2a des Mahlgefäßes 2 bewirkt, wie das aus den Fig. 2a und 2b ersichtlich ist. Fig. 2a und 2b zeigen dabei die Situationen zu den Zeitpunkten A bzw. B. Das über die Mahlgutzuleitung 4 zugeführte Mahlgut wird dabei zwischen Mahlwerkzeug 8 und Umfangswand 2a zunächst grob zerkleinert, bis das Material Partikelgrößen erreicht, die fein genug sind, um in den Bereich zwischen Mahlwerkzeug 8 und Boden 2c zu gelangen. Dort werden die feinen Partikel durch eine Kombination aus Gewichtskraft und Scherung weiter zerkleinert, bevor das Material über das Auslassventil 5 und das pneumatisch gesteuerte Austragssystem 6 und die Mahlgutaustragsleitung 7 ausgeschleust wird. Gegenüber herkömmlichen Scheibenschwingmühlen, bei denen sowohl das Mahlgefäß als auch das Mahlwerkzeug in Bewegung ist, wird das Mahlgefäß hier fest angeordnet. Durch die starre Anordnung des Mahlgefäßes werden höhere Drehzahlen des Malwerkzeugs ermöglicht, da keine die Drehzahl begrenzenden Axiallager vorgesehen werden müssen.So that the grinding tool 8 rolls in a known manner during the grinding process on the peripheral wall 2a of the grinding vessel 2, an excitation system 11 is provided which has a plurality of coils 11a, 11b, 11c, 11d, ..., which are evenly distributed on the Outside of the grinding vessel are arranged in the area of the peripheral wall 2a (see Figures 2a, 2b ). The grinding tool 8, in particular its core, has a magnetic or magnetizable component, which in the illustrated embodiment is formed by four pairs of poles 8a, 8b, 8c, 8d. The excitation coils 11a, 11b,..., Can be controlled separately via a control device not shown in detail. A cleverly selected phase shift of the currents in the respective windings (see Figure 2c ) creates a rotating magnetic field that causes a rolling movement of the grinding tool 8 on the circumferential wall 2a of the grinding vessel 2, like that from the Figures 2a and 2b can be seen. Figures 2a and 2b show the situations at times A and B. The ground material supplied via the grinding material supply line 4 is initially coarsely comminuted between the grinding tool 8 and the peripheral wall 2a until the material reaches particle sizes that are fine enough to get into the area between the grinding tool 8 and To get to floor 2c. There the fine particles are comminuted further by a combination of weight and shear before the material is discharged via the outlet valve 5 and the pneumatically controlled discharge system 6 and the grist discharge line 7. Compared to conventional vibrating disc mills, in which both the grinding vessel and the grinding tool are in motion, the grinding vessel is fixed here. The rigid arrangement of the grinding jar increases the speed of the painting tool allows, since no thrust bearings limiting the speed need to be provided.

Das Antriebskonzept der Scheibenschwingmühle basiert im Wesentlichen auf dem Prinzip eines Permanentmagnet-Motors, der zu den Synchronmaschinen gehört. Der Unterschied liegt lediglich darin, dass der Läufer (in diesem Fall das Mahlwerkzeug 8) nicht in der Mittelachse fixiert ist, sondern sich frei im Mahlraum bewegen kann. Außerdem werden bei dem hier offenbarten Antriebskonzept die einzelnen Segmente der äußeren Erregerwicklungen in der Art aktiviert, dass ein umlaufendes Magnetfeld entsteht, das durch abwechselnde Polarisierung das Mahlwerkzeug in Rotation versetzt. Insgesamt führt die Anregung dazu, dass das scheibenförmige Mahlwerkzeug an der Umfangswand 2c des Mahlgefäßes 2 abrollt.The drive concept of the vibrating disc mill is essentially based on the principle of a permanent magnet motor, which belongs to synchronous machines. The only difference is that the runner (in this case the grinding tool 8) is not fixed in the central axis, but can move freely in the grinding chamber. In addition, with the drive concept disclosed here, the individual segments of the external excitation windings are activated in such a way that a rotating magnetic field is created that sets the grinding tool in rotation through alternating polarization. Overall, the excitation leads to the disk-shaped grinding tool rolling on the peripheral wall 2c of the grinding vessel 2.

Das in Fig. 3 dargestellte zweite Ausführungsbeispiel unterscheidet sich vom Ausführungsbeispiel der Fig. 1 lediglich durch sein Erregersystem 11', das wiederum durch eine Vielzahl von separat ansteuerbaren Erregerspulen 11'a, 11'b, 11'c, 11'd, ... gebildet wird, die aber im Bereich der Decke 2b und Boden 2c des Mahlgefäßes 2 angeordnet sind.This in Fig. 3 The illustrated second embodiment differs from the embodiment of FIG Fig. 1 only by its excitation system 11 ', which in turn is formed by a large number of separately controllable excitation coils 11'a, 11'b, 11'c, 11'd, ..., but which are in the area of the top 2b and bottom 2c of the grinding vessel 2 are arranged.

Im Gegensatz zu dem in Fig. 1 beschriebenen radialen Antriebskonzept ist im Ausführungsbeispiel gemäß Fig. 3 ein axiales Antriebskonzept verwirklicht. Hierfür befinden sich Blechpakete der Erregerspulen als Segmente eines Kreisrings im Boden 2c und Decke 2b des Mahlgefäßes 2. Auch hier erfolgt die Ansteuerung sequenziell, sodass ein um die Mittelachse des Mahlgefäßes rotierendes Magnetfeld entsteht, sodass das scheibenförmige Mahlwerkzeug 8 als rotierende Masse auf einer Kreisbahn bewegt wird (siehe Fig. 4).In contrast to the in Fig. 1 described radial drive concept is in the embodiment according to Fig. 3 realized an axial drive concept. For this purpose, there are laminated cores of the excitation coils as segments of a circular ring in the bottom 2c and top 2b of the grinding vessel 2. Here, too, the control is sequential, so that a rotating magnetic field is created around the center axis of the grinding vessel, so that the disc-shaped grinding tool 8 moves as a rotating mass on a circular path will (see Fig. 4 ).

Gemäß der Erfindung ist eine magnetische Anpresseinrichtung 12 zur Einstellung des Anpressdruckes zwischen Mahlwerkzeug 8 und Boden 2c des Mahlgefäßes 2 vorgesehen (Fig. 5a, 5b). Im dargestellten Ausführungsbeispiel ist im Inneren des Mahlwerkzeugs 8 ein magnetisierbarer Kern oder Permanentmagnet 8g vorgesehen, der mit einem Ringmagneten 12a zusammenwirkt. Der Ringmagnet ist dabei genau auf der Kreisbahn angeordnet, die der Mittelpunkt des scheibenförmigen Mahlwerkzeugs 8 bei seiner Rotation im Mahlgefäß 2 ausführt. Zweckmäßigerweise lässt sich die Stärke des wirksamen Magnetfelds der Anpresseinrichtung 12 an die Zerkleinerungsaufgabe anpassen. Dies kann beispielsweise dadurch erfolgen, dass der Abstand des Ringmagneten 12 zum Boden 2c des Mahlgefäßes verändert wird oder die Stärke des Magnetfeldes elektrisch einstellbar ist.According to the invention, a magnetic pressing device 12 is provided for setting the contact pressure between the grinding tool 8 and the base 2c of the grinding vessel 2 ( Figures 5a, 5b ). In the illustrated embodiment, a magnetizable core or permanent magnet 8g is provided in the interior of the grinding tool 8, which cooperates with a ring magnet 12a. The ring magnet is arranged exactly on the circular path that is the center of the disk-shaped Grinding tool 8 executes during its rotation in the grinding vessel 2. The strength of the effective magnetic field of the pressing device 12 can expediently be adapted to the comminution task. This can take place, for example, in that the distance between the ring magnet 12 and the base 2c of the grinding vessel is changed or the strength of the magnetic field is electrically adjustable.

Die in den Fig. 5a und 5b dargestellte Ausbildung ist insbesondere für das in Fig. 1 dargestellte erste Ausführungsbeispiel geeignet. Beim Ausführungsbeispiel gemäß Fig. 3 kann die Erzeugung des zusätzlichen Anpressdruckes zusätzlich durch das schon vorhandene Erregersystem 11' realisiert werden, indem die Erregerspulen im Bereich der Decke 2b mit unterschiedlicher Stärke zu den Spulen im Bereich des Bodens 2c angesteuert werden.The ones in the Figures 5a and 5b The training shown is especially for the in Fig. 1 illustrated first embodiment suitable. In the embodiment according to Fig. 3 The generation of the additional contact pressure can also be realized by the already existing excitation system 11 ', in that the excitation coils in the area of the ceiling 2b are controlled with different strengths than the coils in the area of the floor 2c.

Claims (10)

  1. Turning disc mill comprising a milling vessel (2), at least one milling tool (8) that can be moved in the milling vessel and has a magnetic or magnetizable constituent part and an exciter system (11, 11') for generating a magnetic field, which causes a movement of the at least one milling tool (8),
    wherein the exciter system (11, 11') is arranged around the milling vessel (2) and is designed to generate a circulating magnetic field and, furthermore, a magnetic pressing device (12) is provided for adjusting the contact pressure between the milling tool (8) and a base (2c) of the milling vessel (2),
    wherein the milling tool (8) has a core (8a) and at least one sheath (8b) made of a wear-resistant material surrounding the core,
    characterized in that
    the turning disc mill comprises a device for determining the position of the milling tool (8) in the milling vessel (2) .
  2. Turning disc mill according to Claim 1, characterized in that the milling vessel (2) has a cover (2b), a base (2c) and a circumferential wall, wherein the exciter system is arranged in the area of the circumferential wall and/or in the area of the cover and/or base of the milling vessel.
  3. Turning disc mill according to Claim 1, characterized in that the milling vessel has a cylindrical circumferential wall (2a), and the milling tool (8) is designed as a milling disc.
  4. Turning disc mill according to Claim 1, characterized in that the exciter system (11, 11') for generating the circulating magnetic field comprises a multiplicity of separately controllable exciter coils (11a, 11b,... ; 11'a, 11'a,...).
  5. Turning disc mill according to Claim 4, characterized in that the exciter system (11, 11') comprises a control device for controlling the exciter coils.
  6. Turning disc mill according to Claim 4, characterized in that the milling tool (8) comprises at least one, preferably 2 to 4 or more pole pairs (8c, 8d, 8e, 8f).
  7. Turning disc mill according to Claim 1, characterized in that the milling vessel (2) is arranged rigidly.
  8. Method for operating a turning disc mill, in which a milling tool (8) having a magnetic or magnetizable constituent part is moved in a milling vessel (2) by a magnetic field,
    wherein the magnetic field is generated as a magnetic field circulating around the milling vessel (2) and the contact pressure between milling tool (8) and a base (2c) of the milling vessel (2) is adjusted 20 by means of a magnetic pressing device (12),
    wherein the milling tool used is a milling tool (8) having a core (8a) and at least one sheath (8b) of a wear-resistant material surrounding the core,
    characterized in that
    the position of the milling tool (8) in the milling vessel is detected by a device for determining the position.
  9. Method according to Claim 8, characterized in that the circulating magnetic field is generated by means of multiple exciter coils (11a, 11b, ...; 11'a, 11'b,...) arranged around the milling vessel (2), by phase-shifted currents being applied to successive exciter coils.
  10. Method according to Claim 8 or 9, characterized in that use is made of a disc-shaped milling tool (8) which rolls on an inner wall of the milling vessel (2) as a result of the circulating magnetic field.
EP14758093.0A 2013-09-02 2014-08-28 Turning disc mill and method of operating a turning disc mill Active EP3041609B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013109537.2A DE102013109537A1 (en) 2013-09-02 2013-09-02 Disc vibratory mill and method of operating a disc vibratory mill
PCT/EP2014/002341 WO2015028151A1 (en) 2013-09-02 2014-08-28 Disc-type vibratory mill and method for operating a disc-type vibratory mill

Publications (2)

Publication Number Publication Date
EP3041609A1 EP3041609A1 (en) 2016-07-13
EP3041609B1 true EP3041609B1 (en) 2021-02-17

Family

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Application Number Title Priority Date Filing Date
EP14758093.0A Active EP3041609B1 (en) 2013-09-02 2014-08-28 Turning disc mill and method of operating a turning disc mill

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EP (1) EP3041609B1 (en)
DE (1) DE102013109537A1 (en)
DK (1) DK3041609T3 (en)
WO (1) WO2015028151A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE412951C (en) * 1924-01-01 1925-04-28 Georg Mars Dipl Ing Process for the comminution of materials by means of balls rotating in a hollow ring-shaped grinding housing
US1894106A (en) * 1929-04-29 1933-01-10 Otto J Lehrack Crushing and mixing machine
IT1072925B (en) * 1976-09-29 1985-04-13 Ind Ossidi Sinterizzati Ios S PROCEDURE AND DEVICE FOR THE PROPULSION OF THE GRINDING BODIES OF THE MILLS, PARTICULARLY OF THE SO-CALLED BALLS
DD148189A1 (en) 1979-03-05 1981-05-13 Hans Mau METHOD AND DEVICE FOR RAW AND WORKER TOOL PREPARATION
DE4343742C2 (en) * 1993-12-21 1999-10-14 Krupp Polysius Ag Disc vibratory mill
JP2007229701A (en) * 2006-02-03 2007-09-13 Michio Shibatani Crushing method and crushing apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
DK3041609T3 (en) 2021-04-26
EP3041609A1 (en) 2016-07-13
DE102013109537A1 (en) 2015-03-05
WO2015028151A1 (en) 2015-03-05

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