EP2052778A1 - Whirlpool mill and grinding tool and grinding ring for same - Google Patents
Whirlpool mill and grinding tool and grinding ring for same Download PDFInfo
- Publication number
- EP2052778A1 EP2052778A1 EP08018640A EP08018640A EP2052778A1 EP 2052778 A1 EP2052778 A1 EP 2052778A1 EP 08018640 A EP08018640 A EP 08018640A EP 08018640 A EP08018640 A EP 08018640A EP 2052778 A1 EP2052778 A1 EP 2052778A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding tool
- grinding
- rotor
- crushing
- tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 238000000227 grinding Methods 0.000 title claims abstract description 110
- 239000000463 material Substances 0.000 claims description 25
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910000746 Structural steel Inorganic materials 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 230000006378 damage Effects 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003801 milling Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Images
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
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
- B02C13/16—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters hinged to the rotor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/28—Shape or construction of beater elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
- B02C2013/145—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with fast rotating vanes generating vortexes effecting material on material impact
Definitions
- the invention relates to an eddy current mill having a grinding gap defined between a stator and a rotor, and a grinding tool which can be fastened to the rotor and a grinding ring for receiving such a milling tool as are used for pulverizing.
- the stator usually has a frustoconical grinding track with an inwardly directed, extending in the axial direction corrugation, which is usually mounted in a housing of the eddy current mill.
- a rotor which can be driven at high speed is provided, which is equipped along the axial direction with one or more several so-called grinding rings, which are carrier elements for the grinding tools.
- the grinding rings are in turn equipped along the circumferential direction with a plurality of grinding tools.
- Such eddy current mills have, for example, rotational speeds of 12,000 rpm and peripheral speeds on the milling tool of 125 m / s.
- rotational speeds of 12,000 rpm and peripheral speeds on the milling tool of 125 m / s.
- Mahlessers caused "eaters” it comes to great damage and a high risk to operating personnel.
- Object of the present invention is to provide an eddy current mill, and a grinding tool and a Mahlring for it, with which the downtime of the eddy current mill lowered and the risk of breakage on the grinding tool can be reduced, so that overall lower operating costs.
- the grinding tool can be pivoted or oscillatingly mounted on the rotor or can be fastened.
- the pivot axis is advantageously parallel to the axis of rotation of the rotor, but may also be inclined by a few degrees, for example, the degree of cone slope of the grinding track to the axis of rotation. Due to the high rotational speed of the rotor while the grinding tool is held in its working position, as long as only the ground material to be ground in the grinding gap is located. On the other hand, it has surprisingly been found that, in spite of the high speeds and circumferential speeds customary in eddy current mills, destructions can be avoided by pivoting the grinding tool out of its working position and thereby avoiding hard foreign bodies.
- the crushing surface of the grinding tool is inclined from a radial plane of the rotor by an inclination angle to the direction of rotation of the rotor. This achieves a further reduction of the impact impulse of hard or heavy foreign bodies on the grinding tool, because a portion of the impact energy is converted into a slipping movement along the inclination angle and thus in friction.
- the grinding tool can be attached either loose pendulum on the rotor according to the hardness or other properties of the ground material be performed fastened or, if the caused by the rotational speed of the rotor centrifugal force for crushing the ground material is insufficient or if the grinding tool would otherwise pivot out of its working position, be biased in this working position on the rotor fastened or be fastened.
- a grinding tool to be used for a particular grinding stock can in each case consist in total of a material corresponding to this material to be grounded, for example when it comes to a minimum of abrasion and a high degree of freedom of metal of the ground powder (eg in the case of luminescent powder) made of ceramic, for example Al 2 O 3
- a particularly abrasion-resistant and abrasion-resistant surface of the grinding tool for very abrasive grinding materials for example, dolomite with quartz foreign inclusions
- cemented carbide for example in the food industry, made of stainless steel.
- the attachment portion may be made of material rather simple or cheaper than the example, particularly hard crushing section.
- the breaking section can be soldered, for example, with the attachment portion.
- an alternating plate to the crushing section, as described for example in the European patent application EP 1 413 357 A1 has already been proposed, and to manufacture this crushing plate from a specific material associated with the crushing process and the support plate holding the crushing plate integral with the attachment portion of a different material.
- the crushing surface of the grinding tool pointing in the direction of rotation of the rotor formed by a coating on the crushing portion, for example, a hard material coating (for example, tungsten carbide, Tictac or even diamond) and the grinding tool otherwise in one piece from a cheaper material to manufacture.
- the crushing section as a crushing plate with the simplest possible geometry, ie, for example, in the form of a parallelepiped and with the smallest possible extent only in the grinding area in order to save material.
- the pivot axis is spaced from the grinding area, then due to the larger lever, the impulse necessary for triggering the pivoting decreases, so that ultimately the thickness of the crushing plate can also be reduced.
- the crushing plate can be spaced apart from a sleeve section by means of a blade which is longer in comparison to its radial extension, on which the grinding tool can be connected to the rotor of the eddy-current mill.
- This has the further advantage that the crushing plate can also contribute with its radially inner edge for comminution when it is in the grinding area.
- the crushing plate can be mounted particularly easily when the wing section has two parallel double wings which delimit a clamping gap into which the crushing plate can be inserted.
- a screwing of the crushing plate may be provided on the wing legs. If the crushing plate is worn, it can easily be turned over if it is ground on all edges.
- the grinding tool has a wing-shaped breaking section 10, which is soldered to a sleeve-shaped fastening section 9 and can consist of a hard metal, whereas the sleeve-shaped fastening section 9 can be made of a standard structural steel.
- soldering any other type of connection, e.g. a bonding or screwing the two sections of the grinding tool 1 with each other conceivable.
- the sleeve-shaped fastening portion 9 or sleeve portion 9 is inserted between two support plates 5, 6 of a break ring shown broken, each having aligned through holes 11.
- a bolt 8 is performed, which fastened via a nut 12, the grinding tool 1 on Mahlring.
- the wing section 10 has a refractive surface designated by 3 on the side pointing in the direction of rotation, against which the particles rebounding from the grinding track located on the other side of the refining gap are to strike and thereby be crushed, so that the millbase is ground to fine powder ,
- the crushing surface 3 is bounded on its radial outer side by a sharp edge 4, which is slightly inclined to the axis of rotation of the rotor, which in turn corresponds to the cone slope of the grinding path, so that the width of the grinding gap is constant.
- FIG. 3 a further improved embodiment of the invention is shown with respect to avoiding damage when entering into the eddy current mill, hard foreign matter.
- the grinding tool is designated by 101 and has a from a radial plane E to the direction of rotation R of the rotor inclined towards refractive surface 3. This further reduces the impulse impinging impulse, since part of the impulse is converted into frictional energy as it slides off the inclined plane.
- an angle of inclination ⁇ an angle of 8 ° to 15 ° has proven to be particularly advantageous in experiments proved.
- the structure of the crushing section 110, but also of the fixing portion 109 corresponds to the structure of the in the Figures 1 and 2 Milling tool 1 shown.
- the grinding tool in this case has a sleeve portion 209, with which it can be attached to the rotor oscillating or between two support rings of the rotor.
- a wing section 213 adjoins the sleeve section 209, via which the breaking tool or the crushing plate 210, which is designated as a whole by 210, is suspended at a distance from the pivot axis defined by the sleeve section.
- the sleeve portion 209 and the wing portion 213 together form the attachment portion of the grinding tool 209 and may be integrally formed, for example, as a casting.
- the wing portion 213 is designed as a double wing with two parallel wing legs 213, between which the breaking tool 210 can be clamped.
- When replacing the crushing tool 210 is thus a certain prefixing or guiding available to bring the breaking tool 210 to the same for screwing the intended position on the wing portion 213 position and to hold there until with 15 designated screws in corresponding through holes 16 on the Wing legs 213 and also inserted in the breaking tool 210 and has been countered on the opposite side.
- the crushing tool 210 is formed as a hard metal crushing plate and has the shape of a parallelepiped with a pointing in the direction of rotation of the rotor of the Wirbelstommühle refractive surface 203, which has a sharp, outwardly directed crushing edge 204a, in the Konusne Trentswinkel the grinding path of the eddy current mill to the rotation axis is inclined.
- edges 204b, 204c, 204d surrounding the crushing surface at the top, at the bottom and toward the axis of rotation are also sharp in order to grind also ground material, which flow has come from the grinding gap between the grinding track and the outer region of the grinding tools 210 inwardly into the region of the inner breaking edge 204 by the rotation of the rotor of the eddy current mill at high speeds of rotation or on the way there at the upper or lower Along breaking edge.
- the crushing plate 203 has a smaller radial extent with respect to the vane section 213, so that the crushing surface 203 and in particular the inner crushing edge 204d is in a region in which the entire crushing surface 203 and the inner crushing edge 204d are also used for superfine grinding in eddy-current mills high speeds can still contribute to the grinding process.
- the long double wing 213 that upon impact of a hard, high-mass foreign body on the crushing plate 210, a moment necessary for pivoting the grinding tool 201 is generated.
- the grinding tool 201 can also be provided with sharp edges on the side facing the direction of rotation, so that it can easily be turned when the crushing surface 203 is worn.
- the grinding tool could also be constructed so that the crushing surface is inclined to the direction of rotation, thereby also reducing the shock pulse of hitting hard, high-mass foreign bodies and thus reduce the possibility that the Mahltechnik train is destroyed, continue to lower.
- the grinding tool could be suspended on the whole by a pivot axis inclined over a radial plane, wherein only the contact surfaces on the sleeve section 209 would have to be formed at a corresponding offset to the vertical angle to the pivot axis.
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Die Erfindung betrifft eine Wirbelstrommühle mit einem zwischen einem Stator und einem Rotor definierten Mahlspalt, sowie ein an dem Rotor befestigbares Mahlwerkzeug und einen Mahlring zur Aufnahme eine solchen Mahrwerkzeugs, wie sie zur Feinstmahlung eingesetzt werden.The invention relates to an eddy current mill having a grinding gap defined between a stator and a rotor, and a grinding tool which can be fastened to the rotor and a grinding ring for receiving such a milling tool as are used for pulverizing.
Derartige Wrbelstrommühlen sind bekannt, beispielsweise aus dem eigenen Patent
Derartige Wirbelstrommühlen weisen beispielsweise Drehzahlen von 12.000 U/min und Umfangsgeschwindigkeiten am Mahwerkzeug von 125 m/s auf. Bei einem Bruch eines der Mahlwerkzeuge bzw. eines durch einen in den Mahlspalt gelangten Fremdkörper oder bei einem durch ein abgebrochenes Stück des Mahlwerkzeugs hervorgerufenen "Fresser" kommt es zu großen Schäden und einer hohen Gefährdung des Bedienpersonals. Insbesondere bei der Zerkleinerung von vorzerkleinerten Papierkatalogen oder Presspapierballen zu Isoliermaterial, aber auch durch in den Mahlspalt gelangende Fremdkörper wie z.B Schrauben kommt es relativ häufig zu einem Bruch an den Mahlwerkzeugen mit den vorstehend genannten Folgen.Such eddy current mills have, for example, rotational speeds of 12,000 rpm and peripheral speeds on the milling tool of 125 m / s. In the event of breakage of one of the grinding tools or of a foreign object passing through the grinding gap or a broken piece of the material Mahlessers caused "eaters" it comes to great damage and a high risk to operating personnel. In particular, in the comminution of pre-shredded paper catalogs or pressed paper bales to insulating material, but also by entering the grinding gap foreign body such as screws, it is relatively common to break the grinding tools with the above consequences.
Bei Hammermühlen, welche zur Grobzerkleinerung von Gestein eingesetzt werden, werden die Schlagwerkzeuge gegen Gitterroste geschlagen, um so auf dem Gitter befindliche Gesteinsbrocken zu zermalmen. Dazu müssen die Schlagwerkzeuge schwenkbar am Rotor der Hammermühle aufgehängt sein. In der deutschen Patentanmeldung
Aus der Deutschen Patentanmeldung
Aufgabe der vorliegenden Erfindung ist es, eine Wirbelstrommühle, bzw. ein Mahlwerkzeug und einen Mahlring dafür zu schaffen, mit denen die Stillstandszeiten der Wirbelstrommühle gesenkt und die Bruchgefahr am Mahlwerkzeug verringert werden kann, so dass sich insgesamt niedrigere Betriebskosten ergeben.Object of the present invention is to provide an eddy current mill, and a grinding tool and a Mahlring for it, with which the downtime of the eddy current mill lowered and the risk of breakage on the grinding tool can be reduced, so that overall lower operating costs.
Diese Aufgabe wird hinsichtlich der Wirbelstrommühle mit den Merkmalen des Anspruchs 15 gelöst, hinsichtlich des Mahlwerkzeugs mit den Merkmalen des Anspruchs 1, sowie hinsichtlich des Mahlrings mit den Merkmalen des Anspruchs 14.This object is achieved with regard to the eddy current mill with the features of
Erfindungsgemäß ist es dabei vorgesehen, das Mahlwerkzeug schwenkbar, bzw. pendelnd am Rotor zu befestigen bzw. befestigbar auszuführen. Dabei ist die Schwenkachse vorteilhaft achsparallel zur Drehachse des Rotors, kann jedoch auch um einige Grade dazu geneigt sein, beispielsweise um den Grad der Konusneigung der Mahlbahn zur Drehachse. Durch die hohe Drehgeschwindigkeit des Rotors wird dabei das Mahlwerkzeug in seiner Arbeitsposition gehalten, solange nur das zu zermahlende Mahlgut im Mahlspalt befindlich ist. Es hat sich dagegen überraschender Weise herausgestellt, dass trotz den in Wirbelstrommühlen üblichen hohen Drehzahlen und Umfangsgeschwindigkeiten Zerstörungen vermieden werden können, indem das Mahlwerkzeug aus seiner Arbeitsposition heraus verschwenken und dadurch harten Fremdkörpern ausweichen kann. Selbst wenn nach dem Eindringen eines solchen Fremdkörpers nicht mehr weitergemahlen werden kann, gelingt es trotzdem, die Schäden an der Mühle zu begrenzen, da dem Bedienpersonal jetzt die Möglichkeit gegeben wird, die Mühle abzuschalten, bevor der Fremdkörper ein oder mehrere Mahlwerkzeuge zerschlägt und dadurch noch größere Schäden hervorruft.According to the invention, it is provided that the grinding tool can be pivoted or oscillatingly mounted on the rotor or can be fastened. In this case, the pivot axis is advantageously parallel to the axis of rotation of the rotor, but may also be inclined by a few degrees, for example, the degree of cone slope of the grinding track to the axis of rotation. Due to the high rotational speed of the rotor while the grinding tool is held in its working position, as long as only the ground material to be ground in the grinding gap is located. On the other hand, it has surprisingly been found that, in spite of the high speeds and circumferential speeds customary in eddy current mills, destructions can be avoided by pivoting the grinding tool out of its working position and thereby avoiding hard foreign bodies. Even if it is no longer possible to continue grinding after the penetration of such a foreign body, it is still possible to limit the damage to the mill, since now the operators are given the opportunity to switch off the mill before the foreign body smashes one or more grinding tools and thus still causes greater damage.
Besonders vorteilhaft ist es dabei, wenn die Brechfläche des Mahlwerkzeugs aus einer Radialebene des Rotors um einen Neigungswinkel zur Drehrichtung des Rotors hin geneigt ist. Damit gelingt eine weitere Reduzierung des Einschlagimpulses von harten oder schweren Fremdkörpern auf das Mahlwerkzeug, weil ein Teil der Einschlagenergie in eine Abrutschbewegung entlang des Neigungswinkels und damit in Reibung umgesetzt wird.It is particularly advantageous if the crushing surface of the grinding tool is inclined from a radial plane of the rotor by an inclination angle to the direction of rotation of the rotor. This achieves a further reduction of the impact impulse of hard or heavy foreign bodies on the grinding tool, because a portion of the impact energy is converted into a slipping movement along the inclination angle and thus in friction.
Das Mahlwerkzeug kann dabei entsprechend der Härte oder sonstigen Eigenschaften des Mahlguts entweder lose pendelnd am Rotor befestigt werden bzw. befestigbar ausgeführt sein oder, falls die durch die Rotationsgeschwindigkeit des Rotors hervorgerufene Zentrifugalkraft zur Zerkleinerung des Mahlguts nicht ausreicht bzw., falls sich das Mahlwerkzeug ansonsten aus seiner Arbeitsposition heraus verschwenken würde, in dieser Arbeitsposition vorgespannt am Rotor befestigt sein bzw. befestigbar sein.The grinding tool can be attached either loose pendulum on the rotor according to the hardness or other properties of the ground material be performed fastened or, if the caused by the rotational speed of the rotor centrifugal force for crushing the ground material is insufficient or if the grinding tool would otherwise pivot out of its working position, be biased in this working position on the rotor fastened or be fastened.
Dabei kann ein für ein bestimmtes Mahlgut zu verwendendes Mahlwerkzeug jeweils insgesamt aus einem diesem Mahlgut entsprechenden Material bestehen, wenn es beispielsweise auf einen minimalen Abrieb und einen hohen Grad an Metallfreiheit des zermahlenen Pulvers ankommt (z.B. bei Leuchstoffpulver) aus Keramik, beispielsweise Al2O3, wenn es auf eine besonders abriebfeste und abrasionswiderständige Oberfläche des Mahlwerkzeugs bei sehr abrasiven Mahlgütern (beispielsweise Dolomit mit Quarzfremdeinschlüssen) ankommt aus Hartmetall wenn es dagegen auf einen ungiftigen Abrieb ankommt, beispielsweise im Lebensmittelbereich, aus Edelstahl.In this case, a grinding tool to be used for a particular grinding stock can in each case consist in total of a material corresponding to this material to be grounded, for example when it comes to a minimum of abrasion and a high degree of freedom of metal of the ground powder (eg in the case of luminescent powder) made of ceramic, for example Al 2 O 3 When it comes to a particularly abrasion-resistant and abrasion-resistant surface of the grinding tool for very abrasive grinding materials (for example, dolomite with quartz foreign inclusions) of cemented carbide if it depends on a non-toxic abrasion, for example in the food industry, made of stainless steel.
Vorteilhaft im Sinne geringerer Materialkosten für diese hochwertigen Materialien ist es jedoch, einen Befestigungsabschnitt, mit dem das Mahlwerkzeug am Umfang des Rotors aufgenommen ist, aus einem anderen Material herzustellen, wie den an den Befestigungsabschnitt anschließenden Brechabschnitt, welcher zum Zermahlen des Mahlguts dient. Auf diese Weise kann zum einen der Befestigungsabschnitt materialmäßig eher einfacher oder billiger ausgebildet sein als der beispielsweise besonders harte Brechabschnitt.However, it is advantageous in terms of lower material costs for these high-quality materials to produce a fastening section with which the grinding tool is received on the circumference of the rotor from a different material, such as the breaking section adjoining the fastening section, which serves for grinding the ground material. In this way, on the one hand, the attachment portion may be made of material rather simple or cheaper than the example, particularly hard crushing section.
Der Brechabschnitt kann dabei beispielsweise mit dem Befestigungsabschnitt verlötet sein. Es wäre jedoch ebenfalls denkbar, am Brechabschnitt eine Wechselbrechplatte anzubringen, wie dies beispielsweise in der europäischen Patentanmeldung
Als vorteilhaft im Sinne einer billigen Fertigung hat es sich dabei erwiesen, den Brechabschnitt als Brechplatte mit einer möglichst einfachen Geometrie, also beispielsweise in Form eines Parallelepipeds zu fertigen und mit einer möglichst geringen Ausdehnung lediglich im Mahlbereich, um Material einzusparen. Ist dabei die Schwenkachse vom Mahlbereich beabstandet, so verringert sich aufgrund des größeren Hebels der zum Auslösen des Verschwenkens nötige Impuls, so dass letztlich auch die Dicke der Brechplatte reduziert werden kann.It has proved to be advantageous in the sense of a low-cost production to manufacture the crushing section as a crushing plate with the simplest possible geometry, ie, for example, in the form of a parallelepiped and with the smallest possible extent only in the grinding area in order to save material. In this case, if the pivot axis is spaced from the grinding area, then due to the larger lever, the impulse necessary for triggering the pivoting decreases, so that ultimately the thickness of the crushing plate can also be reduced.
Dazu kann die Brechplatte über einen im Vergleich zu ihrer radialen Ausdehnung längeren Flügel von einem Hülsenabschnitt beabstandet sein, an dem das Mahlwerkzeug mit dem Rotor der Wirbelstrommühle verbindbar ist. Dies hat den weiteren Vorteil, dass die Brechplatte auch mit ihrer radial innenliegenden Kante zur Zerkleinerung beitragen kann, wenn sich diese im Mahlbereich befindet. Besonders einfach montieren lässt sich die Brechplatte dabei, wenn der Flügelabschnitt zwei parallele Doppelflügel aufweist, die einen Klemmspalt begrenzen, in den die Brechplatte eingesteckt werden kann. Ergänzend dazu kann eine Verschraubung der Brechplatte an den Flügelschenkeln vorgesehen sein. Bei Abnutzung der Brechplatte kann diese einfach gewendet werden, wenn sie an allen Kanten angeschliffen ist.For this purpose, the crushing plate can be spaced apart from a sleeve section by means of a blade which is longer in comparison to its radial extension, on which the grinding tool can be connected to the rotor of the eddy-current mill. This has the further advantage that the crushing plate can also contribute with its radially inner edge for comminution when it is in the grinding area. The crushing plate can be mounted particularly easily when the wing section has two parallel double wings which delimit a clamping gap into which the crushing plate can be inserted. In addition, a screwing of the crushing plate may be provided on the wing legs. If the crushing plate is worn, it can easily be turned over if it is ground on all edges.
Diese Ausführungsformen können selbstverständlich im Rahmen der Erfindung beliebig kombiniert werden.Of course, these embodiments may be combined as desired within the scope of the invention.
Weitere vorteilhafte Weiterbildungen sind Gegenstand der weiteren Unteransprüche und werden anhand der beiliegenden Zeichnungen im Folgenden näher erläutert, wobei
- Figur 1
- eine Teilseitenansicht auf ein an einem Mahlring angebrachtes Mahlwerkzeug gemäß einer Ausführungsform der Erfindung zeigt, und
- Figur 2
- eine Draufsicht auf den mit einem Mahlwerkzeug bestückten Mahlring der
Figur 1 ; - Figur 3
- eine stirnseitige Draufsicht auf ein Mahlwerkzeug gemäß einer weiteren Ausführungsform der Erfindung;
Figur 4- eine Seitenansicht eines Mahlwerkzeugs gemäß einer weiteren Ausführungsform der Erfindung; und
- Figur 5
- eine Draufsicht auf einen Befestigungsabschnitt des in
Fig. 4 dargestellten Mahlwerkzeugs.
- FIG. 1
- shows a partial side view of a mounted on a Mahlring grinding tool according to an embodiment of the invention, and
- FIG. 2
- a plan view of the equipped with a grinding tool Mahlring the
FIG. 1 ; - FIG. 3
- a frontal plan view of a grinding tool according to another embodiment of the invention;
- FIG. 4
- a side view of a grinding tool according to another embodiment of the invention; and
- FIG. 5
- a plan view of a mounting portion of in
Fig. 4 illustrated grinding tool.
Mit 1 ist dabei ein Mahlwerkzeug gemäß einer Ausführungsform der Erfindung gezeigt. Das Mahlwerkzeug weist einen flügelförmigen Brechabschnitt 10 auf, welcher mit einem hülsenförmigen Befestigungsabschnitt 9 verlötet ist und aus einem Hartmetall bestehen kann, wohingegen der hülsenförmige Befestigungsabschnitt 9 aus einem Standardbaustahl hergestellt sein kann. Anstatt einer Verlötung wäre auch jede andere Verbindungsart, z.B. ein Verkleben oder Verschrauben der beiden Abschnitte des Mahlwerkzeugs 1 miteinander denkbar.1 shows a grinding tool according to an embodiment of the invention. The grinding tool has a wing-
Der hülsenförmige Befestigungsabschnitt 9 bzw. Hülsenabschnitt 9 ist dabei zwischen zwei Trägerplatten 5, 6 eines ausgebrochen dargestellten Mahlrings eingeschoben, welche jeweils dazu fluchtende Durchgangsbohrungen 11 aufweisen. Durch die Durchgangsbohrungen 11 und den Hülsenabschnitt 9 ist ein Schraubbolzen 8 durchgeführt, welcher über eine Mutter 12 das Mahlwerkzeug 1 am Mahlring befestigt. Durch einen mehr oder weniger starken Anzug der Mutter lässt sich eine mehr oder weniger leichte bzw. schwergängige Drehbarkeit des Mahlwerkzeugs 1 um die durch den Schraubbolzen 8 gebildete Drehachse erreichen. Dabei wäre es denkbar, zwischen den Trägerplatten 5, 6 und dem Hülsenabschnitt 9 Unterlegscheiben aus einem gut gleitenden Material einzulegen, falls die Reibungskräfte reduziert werden sollen, so dass beim Auftreffen eines harten Fremdkörpers oder dergleichen auf den flügelförmigen Brechabschnitt 10 bzw. Flügelabschnitt 10 ein leichteres Rückgleiten aus der in Radialrichtung ausgerichteten Arbeitsstellung des Mahlwerkzeugs gelingt. Falls dagegen eine erhöhte Widerstandskraft des Mahlwerkzeugs gegen Zurückgleiten gewünscht ist könnte dies über eine Ringfeder bewerkstelligt werden, die einerseits an einem oder beiden Trägerringen und andererseits an dem Mahlwerkzeug befestigt ist. Mit Hilfe der genannten Maßnahmen ist somit die Gängigkeit der Drehbarkeit einstellbar.The sleeve-shaped fastening portion 9 or sleeve portion 9 is inserted between two support plates 5, 6 of a break ring shown broken, each having aligned through holes 11. Through the through holes 11 and the sleeve portion 9, a bolt 8 is performed, which fastened via a
Mit R ist dabei die vorgegebene Rotationsrichtung des Rotors und damit des daran befestigten Mahlrings der Wirbelstrommühle eingezeichnet. Man erkennt, dass der Flügelabschnitt 10 auf der in Rotationsrichtung weisenden Seite eine mit 3 bezeichnete Brechfläche aufweist, auf welche die von der auf der anderen Seite des Mahlspalts liegenden Mahlbahn abprallenden Teilchen auftreffen und dabei zerschlagen werden sollen, so dass das Mahlgut zu Feinpulver vermahlen wird. Die Brechfläche 3 ist dabei auf ihrer radialen Außenseite von einer scharfen Kante 4 begrenzt, welche zur Drehachse des Rotors leicht geneigt ist, was wiederum der Konusneigung der Mahlbahn entspricht, so dass die Breite des Mahlspalts konstant ist.With R, the predetermined direction of rotation of the rotor and thus attached to the grinding ring of the eddy current mill is located. It can be seen that the
In der
Schließlich wird Bezug genommen auf die
Der Hülsenabschnitt 209 und der Flügelabschnitt 213 bilden zusammen den Befestigungsabschnitt des Mahlwerkzeugs 209 und können einstückig beispielsweise als Gussteil ausgebildet sein. Der Flügelabschnitt 213 ist dabei als Doppelflügel mit zwei parallelen Flügelschenkeln 213 ausgebildet, zwischen denen das Brechwerkzeug 210 eingeklemmt werden kann. Beim Austausch des Brechwerkzeugs 210 steht somit eine gewisse Vorfixierung bzw. Führung zur Verfügung, um das Brechwerkzeug 210 an die zum Verschrauben desselben an dem Flügelabschnitt 213 vorgesehene Position zu bringen und dort solange zu halten, bis mit 15 bezeichnete Schrauben in entsprechende Durchgangsbohrungen 16 an den Flügelschenkeln 213 und auch in dem Brechwerkzeug 210 gesteckt und auf der Gegenseite gekontert worden ist.The
Das Brechwerkzeug 210 ist dabei als aus Hartmetall bestehende Brechplatte ausgebildet und hat die Form eines Parallelepipeds mit einer in Drehrichtung des Rotors der Wirbelstommühle weisenden Brechfläche 203, welche eine scharfe, nach außen gerichtete Brechkante 204a aufweist, die im Konusneigungswinkel der Mahlbahn der Wirbelstrommühle zur Rotationsachse hin geneigt ist. Ferner sind auch die anderen, die Brechfläche oben, unten und zur Rotationsachse hin umgebenden Kanten 204b, 204c, 204d scharf, um so auch Mahlgut zu vermahlen, welches durch die bei der mit hohen Drehzahlen erfolgenden Rotation des Rotors der Wirbelstrommühle erzeugte Strömung aus dem Mahlspalt zwischen der Mahlbahn und dem Außenbereich der Mahlwerkzeuge 210 nach innen in den Bereich der innenliegenden Brechkante 204 gelangt ist oder auf dem Weg dort hin an der oberen oder unteren Brechkante entlang streift. Die Brechplatte 203 weist dabei eine gegenüber dem Flügelabschnitt 213 kleinere radiale Ausdehnung auf, so dass sich die Brechfläche 203 und insbesondere die innere Brechkante 204d in einem Bereich befindet, in dem die gesamte Brechfläche 203 und die innere Brechkante 204d auch bei den bei Wirbelstrommühlen zur Feinstzermahlung aufzutreffenden hohen Drehzahlen noch zum Mahlvorgang beitragen kann. Andererseits wird durch den langen Doppelflügel 213 gewährleistet, dass bei Aufprall eines harten, massereichen Fremdkörpers auf die Brechplatte 210 ein zum Verschwenken des Mahlwerkzeugs 201 nötiges Moment erzeugt wird. Vorteilhaft kann das Mahlwerkzeug 201 dabei auch auf der entgegen der Drehrichtung weisenden Seite mit scharfen Kanten versehen sein, so dass es bei Verschleiß der Brechfläche 203 einfach gewendet werden kann.The crushing
Weiterhin vorteilhaft könnte das Mahlwerkzeug auch so aufgebaut sein, dass die Brechfläche zur Drehrichtung hin geneigt ist, um auch dadurch den Stoßimpuls von auftreffenden harten, massereichen Fremdkörpern zu verringern und somit die Möglichkeit, dass das Mahlwerkeug dabei zerstört wird, weiter abzusenken. Dazu könnte einerseits das Mahlwerkzeug insgesamt um eine in über einer Radialebene geneigten Schwenkachse aufgehängt sein, wobei lediglich die Anlageflächen am Hülsenabschnitt 209 unter einem entsprechenden, zur Senkrechten versetzten Winkel zur Schwenkachse ausgebildet sein müssten. Andererseits wäre es auch denkbar, die beiden parallelen Flügelschenkel 213 des Flügelabschnitts unter Winkel zum Hülsenabschnitt 209 an diesem anzuformen, so dass der Klemmspalt und damit die Brechplatte 210 zur Drehrichtung hin geneigt verläuft.Further advantageously, the grinding tool could also be constructed so that the crushing surface is inclined to the direction of rotation, thereby also reducing the shock pulse of hitting hard, high-mass foreign bodies and thus reduce the possibility that the Mahlwerk train is destroyed, continue to lower. For this purpose, on the one hand, the grinding tool could be suspended on the whole by a pivot axis inclined over a radial plane, wherein only the contact surfaces on the
Selbstverständlich sind Abweichungen und Modifikationen der dargestellten Ausführungsform möglich, ohne den Rahmen der Erfindung zu verlassen.Of course, deviations and modifications of the illustrated embodiment are possible without departing from the scope of the invention.
So wäre es beispielsweise denkbar, die Brechfläche 3 mit einer Tasche auszuformen.For example, it would be conceivable to form the crushing surface 3 with a pocket.
Claims (15)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710051393 DE102007051393B4 (en) | 2007-10-25 | 2007-10-25 | Eddy current mill, as well as grinding tool and Mahlring for it |
DE200710057565 DE102007057565A1 (en) | 2007-11-29 | 2007-11-29 | Eddy current mill, rotor and stator, as well as grinding track insert and grinding tool insert for it |
Publications (2)
Publication Number | Publication Date |
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EP2052778A1 true EP2052778A1 (en) | 2009-04-29 |
EP2052778B1 EP2052778B1 (en) | 2015-07-01 |
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Application Number | Title | Priority Date | Filing Date |
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EP08018640.6A Active EP2052778B1 (en) | 2007-10-25 | 2008-10-24 | Whirlpool mill and grinding tool and grinding ring for same |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2319625A1 (en) | 2009-11-05 | 2011-05-11 | MICROTEC GmbH | Vortex mill and grinding tool for same |
TWI549755B (en) * | 2015-06-18 | 2016-09-21 | Huan-Gui Wei | Grinder of the mixing device |
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US1436101A (en) * | 1919-02-25 | 1922-11-21 | Joseph L Hiller | Crushing and pulverizing machine |
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EP2319625A1 (en) | 2009-11-05 | 2011-05-11 | MICROTEC GmbH | Vortex mill and grinding tool for same |
DE102009053150A1 (en) | 2009-11-05 | 2011-05-12 | Microtec Gmbh | Whirlwinds and grinding tool for it |
DE202009019131U1 (en) | 2009-11-05 | 2017-01-22 | Microtec Gmbh | Whirlwind mill and grinding tool for it |
TWI549755B (en) * | 2015-06-18 | 2016-09-21 | Huan-Gui Wei | Grinder of the mixing device |
Also Published As
Publication number | Publication date |
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EP2052778B1 (en) | 2015-07-01 |
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