EP3041609B1 - Broyeur à disque tournant et procédé de fonctionnement d'un broyeur à disque tournant - Google Patents

Broyeur à disque tournant et procédé de fonctionnement d'un broyeur à disque tournant 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
European Patent Office
Prior art keywords
milling
vessel
grinding
magnetic field
disc mill
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.)
Active
Application number
EP14758093.0A
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German (de)
English (en)
Other versions
EP3041609A1 (fr
Inventor
Michael Wilczek
Jürgen Schneberger
Reinhard Teutenberg
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.)
ThyssenKrupp Industrial Solutions AG
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ThyssenKrupp Industrial Solutions AG
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Classifications

    • 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.

Landscapes

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

Claims (10)

  1. Broyeur à disques vibrants comportant un récipient de broyage (2), au moins un outil de broyage (8) déplaçable dans le récipient de broyage et doté d'un composant magnétique ou magnétisable et d'un système d'excitation (11, 11') servant à générer un champ magnétique qui provoque un déplacement de l'au moins un outil de broyage (8),
    dans lequel le système d'excitation (11, 11') est disposé autour du récipient de broyage (2) et est conçu pour générer un champ magnétique tournant et en outre un dispositif de pressage magnétique (12) servant au réglage de la pression d'appui entre l'outil de broyage (8) et un fond (2c) du récipient de broyage (2) est prévu, dans lequel l'outil de broyage (8) comprend une partie centrale (8a) et au moins une enveloppe (8b) entourant la partie centrale et constituée d'une matière résistante à l'usure,
    caractérisé en ce que
    le broyeur à disques vibrants comporte un dispositif permettant de déterminer la position de l'outil de broyage (8) dans le récipient de broyage (2).
  2. Broyeur à disques vibrants selon la revendication 1, caractérisé en ce que le récipient de broyage (2) comprend une partie supérieure (2b), un fond (2c) et une paroi périphérique, le système d'excitation étant disposé dans la région de la paroi périphérique et/ou dans la région de la partie supérieure et/ou du fond du récipient de broyage.
  3. Broyeur à disques vibrants selon la revendication 1, caractérisé en ce que le récipient de broyage comprend une paroi périphérique cylindrique (2a) et l'outil de broyage (8) est réalisé en tant que disque de broyage.
  4. Broyeur à disques vibrants selon la revendication 1, caractérisé en ce que le système d'excitation (11, 11') servant à générer le champ magnétique tournant comporte une pluralité de bobines d'excitation (11a, 11b,... ; 11'a, 11'a,...) pouvant être commandées séparément.
  5. Broyeur à disques vibrants selon la revendication 4, caractérisé en ce que le système d'excitation (11, 11') comporte un dispositif de commande servant à la commande des bobines d'excitation.
  6. Broyeur à disques vibrants selon la revendication 4, caractérisé en ce que l'outil de broyage (8) comporte au moins une, de préférence 2 à 4 ou plusieurs paires de pôles (8c, 8d, 8e, 8f).
  7. Broyeur à disques vibrants selon la revendication 1, caractérisé en ce que le récipient de broyage (2) est disposé rigidement.
  8. Procédé permettant de faire fonctionner un broyeur à disques vibrants, dans lequel un outil de broyage (8) est déplacé par un champ magnétique dans un récipient de broyage (2) à l'aide d'un composant magnétique ou magnétisable,
    dans lequel le champ magnétique est généré en tant que champ magnétique tournant autour du récipient de broyage (2) et la pression d'appui entre l'outil de broyage (8) et un fond (2c) du récipient de broyage (2) est réglée 20 au moyen d'un dispositif de pressage magnétique (12), dans lequel un outil de broyage (8) doté d'une partie centrale (8a) et d'au moins une enveloppe (8b) entourant la partie centrale et constituée d'une matière résistante à l'usure est utilisé comme outil de broyage, caractérisé en ce que
    la position de l'outil de broyage (8) dans le récipient de broyage est détectée à l'aide d'un dispositif de détermination de la position.
  9. Procédé selon la revendication 8, caractérisé en ce que le champ magnétique tournant est généré au moyen de plusieurs bobines d'excitation (11a, 11b,... ; 11'a, 11'b,...) disposées autour du récipient de broyage (2), par le fait que des bobines d'excitation successives sont soumises à des courants déphasés.
  10. Procédé selon la revendication 8 ou 9, caractérisé en ce qu'un outil de broyage (8) réalisé en forme de disque est utilisé, lequel outil roule sur une paroi intérieure du récipient de broyage (2) grâce au champ magnétique tournant.
EP14758093.0A 2013-09-02 2014-08-28 Broyeur à disque tournant et procédé de fonctionnement d'un broyeur à disque tournant Active EP3041609B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013109537.2A DE102013109537A1 (de) 2013-09-02 2013-09-02 Scheibenschwingmühle und Verfahren zum Betreiben einer Scheibenschwingmühle
PCT/EP2014/002341 WO2015028151A1 (fr) 2013-09-02 2014-08-28 Broyeur vibrant à disques et procédé pour faire fonctionner un broyeur vibrant à disques

Publications (2)

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

Family

ID=51453723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14758093.0A Active EP3041609B1 (fr) 2013-09-02 2014-08-28 Broyeur à disque tournant et procédé de fonctionnement d'un broyeur à disque tournant

Country Status (4)

Country Link
EP (1) EP3041609B1 (fr)
DE (1) DE102013109537A1 (fr)
DK (1) DK3041609T3 (fr)
WO (1) WO2015028151A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE412951C (de) * 1924-01-01 1925-04-28 Georg Mars Dipl Ing Verfahren zur Zerkleinerung von Stoffen mittels in einem hohlringfoermigen Mahlgehaeuse umlaufender Kugeln
US1894106A (en) * 1929-04-29 1933-01-10 Otto J Lehrack Crushing and mixing machine
IT1072925B (it) * 1976-09-29 1985-04-13 Ind Ossidi Sinterizzati Ios S Procedimento e dispositivo per la propulsione dei corpi macinanti dei mulini particolarmente di quelli cosiddetti a palle
DD148189A1 (de) 1979-03-05 1981-05-13 Hans Mau Verfahren und vorrichtung zur roh-und werkstoffaufbereitung
DE4343742C2 (de) * 1993-12-21 1999-10-14 Krupp Polysius Ag Scheibenschwingmühle
JP2007229701A (ja) * 2006-02-03 2007-09-13 Michio Shibatani 破砕方法及びその装置

Non-Patent Citations (1)

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

Also Published As

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

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