EP0353576A2 - Impact mill - Google Patents

Impact mill Download PDF

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Publication number
EP0353576A2
EP0353576A2 EP89113525A EP89113525A EP0353576A2 EP 0353576 A2 EP0353576 A2 EP 0353576A2 EP 89113525 A EP89113525 A EP 89113525A EP 89113525 A EP89113525 A EP 89113525A EP 0353576 A2 EP0353576 A2 EP 0353576A2
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EP
European Patent Office
Prior art keywords
mill
beater
wheel
beaters
removal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89113525A
Other languages
German (de)
French (fr)
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EP0353576B1 (en
EP0353576A3 (en
Inventor
Edgar Hönges
Thomas Liesemeier
Walter Lohmüller
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Henkel AG and Co KGaA
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Henkel AG and Co KGaA
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Publication date
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Priority to AT89113525T priority Critical patent/ATE86145T1/en
Publication of EP0353576A2 publication Critical patent/EP0353576A2/en
Publication of EP0353576A3 publication Critical patent/EP0353576A3/en
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Publication of EP0353576B1 publication Critical patent/EP0353576B1/en
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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
    • 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
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected 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
    • B02C13/286—Feeding or discharge
    • 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
    • B02C13/286—Feeding or discharge
    • B02C2013/28618—Feeding means
    • B02C2013/28672—Feed chute arrangements

Definitions

  • the invention relates to a beater mill with a beater wheel mounted in a mill housing on a horizontal axis, the periphery of the beater wheel being equipped with a plurality of approximately radially oriented beaters and the beaters on the inner periphery of the mill housing being opposed by a grinding path formed by the product, and the mill housing being approximately mill door standing perpendicular to the horizontal axis.
  • a tower powder with a broad grain spectrum is produced.
  • the coarse fractions of the tower powder are sieved off as a flap. Since the chemical composition of the coarse fraction corresponds to that of normal powder, it makes sense to adapt the grain spectrum of the coarse fraction to that of the material flow by comminution.
  • This mill which is known as a so-called impact screen mill, consists in itself of a beater wheel with several beaters or baffle plates and a sieve basket surrounding this wheel, the beater wheel and sieve basket being able to rotate in opposite directions during operation.
  • the grinding process of these mills takes place primarily in the area between the grinding track and the peripheral edges of the beater wheel, the grinding track essentially lying just below the inner surface within the sieve basket.
  • the distance between the peripheral racket edges and the grinding track should be a certain minimum amount, e.g. B. 5 to 15 mm, do not fall below.
  • the peripheral edges of the club should of course not touch the grinding track, because then - due to the increased friction - the club wheel could even be blocked.
  • caking forms preferentially and first. Because of the progressively increasing friction between the grinding track, sieve basket and beater wheel, every movement of the sieve basket and / or beater wheel is blocked, often after a few hours of operation. To increase the service life of the grinder when grinding sticky products, you could therefore try the sieve basket entirely omitted to increase the distance between the periphery of the club wheel and the grinding track. Corresponding experiments carried out by the inventors showed a slightly increased service life of the mill, but after three days at the latest the caking on the inner surface of the grinding path of the mill housing had increased so that the beater wheel blocked and the mill had to be opened for cleaning.
  • the beater wheel of the impact or impact mill is basically equivalent to the rotor of a fan. It therefore conveys large amounts of air.
  • the mill was equipped with a relatively small beater wheel with the housing unchanged. As such, it would have been expected that the service life regarding the gluing and caking of the grinding chamber would be significantly increased until the beater wheel was blocked. In practice, however, the service life was not significantly longer than that of a larger diameter beater wheel.
  • the invention is based on the object, the service life, that is to say the trouble-free operating time, of an impact mill to increase the type mentioned when grinding heavily caking or sticking products, such as screened detergent flashover, preferably to at least about a month.
  • this object is achieved according to the invention in that the beaters are directly opposite the grinding path formed by the product and at least one beater in the function as a removal beater projects radially further outwards than the rest of the beaters.
  • the beater wheel itself forms its grinding path with the help of the removal beater and thereby keeps a defined area in the grinding chamber clear.
  • the grinding chamber is prevented from overgrowing and the beater wheel is consequently blocked.
  • this mass shift can be caused in any way, e.g. B. be balanced by additional masses on the stick wheel.
  • the balancing can take place without additional masses if the first clearing racket is diametrical opposite second clearing racket - also projecting in the radial direction - is provided.
  • three or more removal clubs can be arranged symmetrically distributed around the circumference of the racket wheel.
  • the grinding track provided on the inner circumference of the mill housing is formed by the clearing beater or cutters according to the invention and at the same time the grinding chamber between the circumference of the beater wheel and the grinding track is kept clear.
  • the grinding chamber can be kept particularly effective with regard to the power required for the scraper if the scraper beaters are toothed on their peripheral edge and if the teeth of the scraper rack teeth are offset against one another. If, for example, with two diametrically opposed removal beaters, each tooth of one removal beater falls into a gap in the other removal beater, the effort required to keep the grinding chamber free is particularly low, so that blockages cannot occur.
  • a cone integrated in the mill door is provided as the product feed to the beater wheel.
  • the cone which opens in the direction of the beater wheel, prevents the product inlet from baking, even if the product tends to stick.
  • the outside diameter of the cone on the side facing the beater wheel should be slightly smaller than the diameter of the beater wheel in order to avoid that from the grinding chamber provided on the periphery of the beater wheel, already ground product, which is still prone to caking, is pressed back into the insertion cone. For the same reason, the distance between the cone and the club wheel should be kept as small as possible without mutual friction.
  • Equipping the beater wheel with one or more radially projecting removal beaters is advantageous regardless of the difference in diameter between the beater wheel and the inner circumference of the mill housing. Even if, for example, to reduce the amount of air conveyed by the mill, a relatively small beater wheel is provided, it is essential for an economically satisfactory service life to equip this beater wheel according to the invention with at least one removal beater protruding in the radial direction, which removes the grinding path assigned to the beater wheel on the product that cakes itself on the inner circumference of the mill housing and that permanently keeps the grinding chamber clear. After a relatively short operating time, such a mill operates as if the diameter of the mill housing was reduced. The dimensions of the product feed must be adapted to the reduced beater wheel.
  • the beater wheel 3 has a plurality of beaters 4 which describe the circumference 6 of the beater wheel 3 defined during rotation with its peripheral edge.
  • two beaters in the function as clearing beater 9 are enlarged in the radial direction to such an extent that they reach the (provided) grinding track 1. If the grinding track 1 is therefore not formed directly by the material of the mill housing but by caking product, the peripheral edges 10 of the removal beaters 9 determine the grinding track 1.
  • the mill has a mill housing 11, within which a beater wheel 3 is rotatably mounted about an axis 2.
  • the beater wheel 3 is driven from outside via a shaft 12. It has a large number of clubs 4 and diametrically two clearing beaters 9 projecting over its circumference 6, which keep or define the grinding chamber 8 and thus the grinding track 1.
  • the removal racket 9 provided in the exemplary embodiment has a toothing 13 according to FIG. 2, the teeth 14 and gaps 15 of which are offset from one another such that a tooth 14 and a gap 15 always meet in the circumferential direction.
  • the section of FIG. 2 also shows a product feed, designated overall by 16, which is integrated in a mill door 17 and is designed as a cone 18 which is open towards the beater wheel 3.
  • the outer diameter d of the cone 18 on its side facing the beater wheel 3 should be slightly smaller than the diameter D of the beater wheel 3.
  • the distance a between the cone 18 and beater wheel 3 is kept as small as possible.
  • the choice of the relative sizes d / D and the smallest possible distance a prevent fresh material from the grinding chamber 8, which is still prone to caking, from being pressed back into the product feed 16 and from clogging the feed.
  • the regrind should normally be discharged in the radial direction, for example — as shown in FIG. 2 — through an outlet 19 provided on the underside in the direction of the arrow.
  • Fig. 4. shows an example of an application of the impact mill according to Fig. 1 to 3.
  • a tower powder with a broad grain spectrum and mixed with agglomerates, fragments and wall deposits is produced in the discharge of the dryer.
  • the coarse fractions of the tower powder are sieved off as a flap.
  • You get, for example, from the screen 20 5th G (G upper floor) of a drying tower into one Mill 21 according to the invention, which can be located, for example, in the 4th G of the drying tower.
  • the outlet of the mill 21 can be connected in the 3rd G to a line 23 which leads the ground product back to the tower discharge belt 25 located in the 2nd G of the drying tower.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Crushing And Grinding (AREA)
  • Graft Or Block Polymers (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Food-Manufacturing Devices (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

For the comminution of fresh wash powder coarse particles after drying, a hammer bar mill can be used, the beater wheel (3) of which is equipped with two diametrically opposite, enlarged clearing beaters (9) which keep a milling space (8) on the circumference (6) of the beater wheel (3) free and thus prevent a blocking of the beater wheel (3). The peripheral edge (10) of the clearing beater (9) can be provided with a toothing (13) which is arranged in such a way that the tooth (14) of the one clearing beater (9) drops into the gap (15) of the other. <IMAGE>

Description

Die Erfindung betrifft eine Schlagmühle mit einem in einem Mühlengehäuse auf einer horizontalen Achse gelagerten Schlägerrad, wobei der Umfang des Schlägerrades mit einer Vielzahl etwa radial ausgerichteter Schläger bestückt ist und den Schlägern am Innenumfang des Mühlengehäuses eine vom Produkt gebildete Mahlbahn gegenübersteht und wobei das Mühlengehäuse eine etwa senkrecht zu der horizontalen Achse stehende Mühlentür besitzt.The invention relates to a beater mill with a beater wheel mounted in a mill housing on a horizontal axis, the periphery of the beater wheel being equipped with a plurality of approximately radially oriented beaters and the beaters on the inner periphery of the mill housing being opposed by a grinding path formed by the product, and the mill housing being approximately mill door standing perpendicular to the horizontal axis.

Bei der Herstellung von Waschmitteln im Sprühtrocknungsverfahren entsteht ein Turmpulver mit breitem Kornspektrum. Zusätzlich finden sich Agglomerate und Bruchstücke aus Wandansätzen im Austrag des Trockners. Zum Erreichen eines qualitätsgerechten Kornspektrums werden die Grobanteile des Turmpulvers als Über­schlag abgesiebt. Da die chemische Zusammensetzung des Groban­teils derjenigen des normalen Pulvers entspricht, liegt es nahe, das Kornspektrum des Grobanteils demjenigen des Gutstroms durch Zerkleinerung anzugleichen.In the production of detergents using the spray drying process, a tower powder with a broad grain spectrum is produced. In addition, there are agglomerates and fragments from wall attachments in the dryer discharge. In order to achieve a quality-related grain spectrum, the coarse fractions of the tower powder are sieved off as a flap. Since the chemical composition of the coarse fraction corresponds to that of normal powder, it makes sense to adapt the grain spectrum of the coarse fraction to that of the material flow by comminution.

In bisher üblichen Mahlsystemen führte die Neigung des frischen, warmen Überschlags, bei der Zerkleinerung zu verkleben und An­backungen zu bilden, meist schon nach kurzer Zeit, das heißt nach einigen Betriebsstunden, durch Anwachsen von Ansätzen zu Verstopfungen des Systems und bei der Verwendung von Schlag­mühlen zu Blockagen des Schlägerrades. Der hohe Wartungsauf­wand dieser Anlagen mit zum Teil täglicher Reinigung machte die Zerkleinerung unwirtschaftlich. Der abgesiebte Überschlag wird daher bisher in den Slurryansatz zurückgeführt, er muß also den Zerstäubungsprozeß erneut durchlaufen. Die mögliche Leistung des Trockners verringert sich auf diese Weise um die Überschlag­menge. Es besteht daher ein erheblicher Bedarf an einer Mühle, die in der Lage ist, auch stark anbackendes, verklebendes Pro­dukt definiert zu zerkleinern.In previously common grinding systems, the tendency of the fresh, warm rollover to stick together during comminution and form caking, usually after just a short time, i.e. after a few hours of operation, caused clogging of the system and the use of impact mills due to the build-up of batches Blockages of the bat wheel. The high level of maintenance required for these systems, some of them daily cleaning, made the shredding uneconomical. The screened flap has therefore been returned to the slurry batch, so it must be Go through the atomization process again. The possible performance of the dryer is reduced in this way by the rollover amount. There is therefore a considerable need for a mill that is able to grind even heavily caking, adhesive product in a defined manner.

Versuche wurden mit der eingangs genannten Schlagmühle bzw. Prallmühle ausgeführt. Diese Mühle, die als sogenannte Prall­siebmühle im Handel ist, besteht an sich aus einem Schlägerrad mit mehreren Schlägern bzw. Pralltellern sowie einem dieses Rad umschließenden Siebkorb, wobei Schlägerrad und Siebkorb bei Be­trieb gegensinnig rotieren können.Experiments were carried out with the impact mill or impact mill mentioned at the beginning. This mill, which is known as a so-called impact screen mill, consists in itself of a beater wheel with several beaters or baffle plates and a sieve basket surrounding this wheel, the beater wheel and sieve basket being able to rotate in opposite directions during operation.

Der Mahlprozeß dieser Mühlen findet in erster Linie im Bereich zwischen Mahlbahn und peripheren Kanten des Schlägerrades statt, wobei die Mahlbahn im wesentlichen knapp unterhalb der Innen­oberfläche innerhalb des Siebkorbes liegt.The grinding process of these mills takes place primarily in the area between the grinding track and the peripheral edges of the beater wheel, the grinding track essentially lying just below the inner surface within the sieve basket.

Um die Beweglichkeit des Schlägerrades zu gewährleisten, soll der Abstand der peripheren Schlägerkanten zur Mahlbahn einen gewissen Mindestbetrag, z. B. 5 bis 15 mm, nicht unterschreiten. Insbe­sondere dürfen die peripheren Schlägerkanten die Mahlbahn natür­lich nicht berühren, weil dann - wegen der erhöhten Reibung - sogar mit einem Blockieren des Schlägerrads zu rechnen wäre.In order to ensure the mobility of the racket wheel, the distance between the peripheral racket edges and the grinding track should be a certain minimum amount, e.g. B. 5 to 15 mm, do not fall below. In particular, the peripheral edges of the club should of course not touch the grinding track, because then - due to the increased friction - the club wheel could even be blocked.

Beim Verarbeiten von klebendem Produkt bilden sich am Siebkorb bevorzugt und zuerst Anbackungen. Wegen der dadurch progressiv zunehmenden Reibung zwischen Mahlbahn, Siebkorb und Schläger­rad wird schließlich, häufig schon nach einigen Stunden Betriebs­dauer, jede Bewegung von Siebkorb und/oder Schlägerrad blok­kiert. Zum Erhöhen der Standzeit der Mühle beim Vermahlen kleb­riger Produkte könnte man daher versuchen, den Siebkorb ganz wegzulassen, um den Abstand zwischen Schlägerradperipherie und Mahlbahn zu vergrößern. Entsprechende von den Erfindern durch­geführte Versuche ergaben zwar eine geringfügig erhöhte Stand­zeit der Mühle, nach spätestens drei Tagen waren jedoch die Anbackungen an der Innenfläche der Mahlbahn des Mühlengehäu­ses so angewachsen, daß das Schlägerrad blockierte und die Mühle zum Reinigen geöffnet werden mußte.When processing adhesive product, caking forms preferentially and first. Because of the progressively increasing friction between the grinding track, sieve basket and beater wheel, every movement of the sieve basket and / or beater wheel is blocked, often after a few hours of operation. To increase the service life of the grinder when grinding sticky products, you could therefore try the sieve basket entirely omitted to increase the distance between the periphery of the club wheel and the grinding track. Corresponding experiments carried out by the inventors showed a slightly increased service life of the mill, but after three days at the latest the caking on the inner surface of the grinding path of the mill housing had increased so that the beater wheel blocked and the mill had to be opened for cleaning.

Das Schlägerrad der Schlag- bzw. Prallmühle ist prinzipiell dem Läufer eines Ventilators gleichzusetzen. Es fördert daher große Luftmengen.The beater wheel of the impact or impact mill is basically equivalent to the rotor of a fan. It therefore conveys large amounts of air.

Um die großen Luftmengen zu verringern, wurde die Mühle mit einem bei unverändertem Gehäuse relativ kleineren Schlägerrad ausgerüstet. Hierbei wäre an sich zu erwarten gewesen, daß die Standzeit betreffend das Verkleben und Verbacken des Mahlraums bis zum Blockieren des Schlägerrades deutlich vergrößert würde. In der Praxis ergab sich aber keine nennenswert längere Stand­zeit als bei einem Schlägerrad größeren Durchmessers.In order to reduce the large amounts of air, the mill was equipped with a relatively small beater wheel with the housing unchanged. As such, it would have been expected that the service life regarding the gluing and caking of the grinding chamber would be significantly increased until the beater wheel was blocked. In practice, however, the service life was not significantly longer than that of a larger diameter beater wheel.

Ein weiteres Problem bei dem Vermahlen des vorgenannten Pulver­überschlags tritt am Einlauf einer herkömmlichen Prallmühle bzw. Schlagmühle auf. Das klebrige und zum Anbacken neigende Pro­dukt verstopft nämlich allmählich den von der Mühlentür aus axial in das Schlägerrad hineingerichteten Mühleneinlauf. Dieses Ver­stopfungsproblem wird um so aktueller, je besser es gelingt, die Standzeit der Mühle betreffend das Blockieren des Schlägerrads im Mahlraum zu vergrößern.Another problem with the grinding of the aforementioned powder flashover occurs at the inlet of a conventional impact mill or impact mill. The sticky product, which tends to stick, gradually clogs the mill inlet directed axially into the beater wheel from the mill door. This problem of constipation becomes all the more topical the better it is possible to increase the service life of the mill in terms of blocking the beater wheel in the grinding chamber.

Der Erfindung liegt die Aufgabe zugrunde, die Standzeit, das heißt die störungsfreie Betriebszeit, einer Schlagmühle eingangs genannter Art beim Vermahlen von stark anbackenden bzw. ver­klebenden Produkten, wie abgesiebtem Waschmittelüberschlag, - vorzugsweise auf mindestens etwa einen Monat - zu erhöhen.The invention is based on the object, the service life, that is to say the trouble-free operating time, of an impact mill to increase the type mentioned when grinding heavily caking or sticking products, such as screened detergent flashover, preferably to at least about a month.

Bei einer Schlagmühle der eingangs bezeichneten Art wird diese Aufgabe gemäß der Erfindung dadurch gelöst, daß den Schlägern direkt die vom Produkt gebildete Mahlbahn gegenübersteht und mindestens ein Schläger in der Funktion als Ausräumschläger radial weiter nach außen vorspringt als der Rest der Schläger.In the case of a beater mill of the type mentioned at the outset, this object is achieved according to the invention in that the beaters are directly opposite the grinding path formed by the product and at least one beater in the function as a removal beater projects radially further outwards than the rest of the beaters.

Durch die Erfindung wird erreicht, daß das Schlägerrad seine Mahlbahn mit Hilfe des Ausräumschlägers selbst bildet und dadurch einen definierten Bereich im Mahlraum freihält. Auf diese Weise und durch das Fehlen eines Siebkorbes, der durch Verstop­fung mit klebendem Produkt einen Weiterbetrieb verhindern würde, werden ein Zuwachsen des Mahlraums und ein dadurch be­dingtes Blockieren des Schlägerrades verhindert. Allein durch Anbringen eines Ausräumschlägers und Weglassen des Siebkorbes kann also die Standzeit der Mühle ganz erheblich, insbesondere auf einen Monat und mehr, erhöht werden, ohne daß Blockaden aufträten, eine Zwischenreinigung erforderlich würde oder Qualitätseinbußen in Kauf zu nehmen wären. Da ferner nur ein oder zwei oder jedenfalls nur (relativ zur Gesamtzahl der Schläger) wenige Ausräumschläger vorgesehen werden, ist für die Masse der Schläger der für einen ausreichenden Produktdurchsatz erforderliche Abstand Schlägerperipherie/Mahlbahn gewahrt.It is achieved by the invention that the beater wheel itself forms its grinding path with the help of the removal beater and thereby keeps a defined area in the grinding chamber clear. In this way and due to the lack of a sieve basket, which would prevent further operation due to blockage with adhesive product, the grinding chamber is prevented from overgrowing and the beater wheel is consequently blocked. Simply by attaching a clearing racket and omitting the screen basket, the life of the mill can be increased considerably, in particular to one month and more, without blockages occurring, intermediate cleaning being necessary or compromising on quality. Furthermore, since only one or two or in any case only a few clearing clubs are provided (relative to the total number of clubs), the distance between racket periphery and grinding track required for a sufficient product throughput is ensured for the mass of the clubs.

Wenn lediglich ein Schläger als Ausräumschläger radial aus dem durch den Rest der Schläger aufgespannten (definierten) Umfangs­kreis nach außen vorspringt, kann diese Massenverschiebung auf irgendeine Weise, z. B. durch zusätzliche Massen am Schlägerrad, ausgewuchtet werden. Das Auswuchten kann ohne zusätzliche Massen erfolgen, wenn ein dem ersten Ausräumschläger diametral gegenüberliegender zweiter Ausräumschläger - ebenfalls in radialer Richtung vorspringend - vorgesehen wird. Ebenso können auch drei oder mehr Ausräumschläger symmetrisch am Umfang des Schlägerrades verteilt angeordnet werden.If only one racket projects radially outward from the circumferential circle spanned (defined) by the rest of the rackets, this mass shift can be caused in any way, e.g. B. be balanced by additional masses on the stick wheel. The balancing can take place without additional masses if the first clearing racket is diametrical opposite second clearing racket - also projecting in the radial direction - is provided. Likewise, three or more removal clubs can be arranged symmetrically distributed around the circumference of the racket wheel.

Durch den oder die erfindungsgemäßen Ausräumschläger wird die am Innenumfang des Mühlengehäuses vorgesehene Mahlbahn ge­formt und zugleich der Mahlraum zwischen dem Umfang des Schlägerrades und der Mahlbahn freigehalten. Besonders wirksam in Hinsicht auf den für die Ausräumer benötigten Kraftbedarf läßt sich der Mahlraum freihalten, wenn die Ausräumschläger an ihrer peripheren Kante verzahnt werden, und wenn die Zähne der Ver­zahnung der Ausräumschläger gegeneinander versetzt werden. Wenn beispielsweise bei zwei diametral gegenüberstehenden Aus­räumschlägern jeder Zahn des einen Ausräumschlägers in eine Lücke des anderen Ausräumschlägers fällt, ist der Kraftaufwand zum Freihalten des Mahlraums besonders gering, so daß Blockaden nicht auftreten können.The grinding track provided on the inner circumference of the mill housing is formed by the clearing beater or cutters according to the invention and at the same time the grinding chamber between the circumference of the beater wheel and the grinding track is kept clear. The grinding chamber can be kept particularly effective with regard to the power required for the scraper if the scraper beaters are toothed on their peripheral edge and if the teeth of the scraper rack teeth are offset against one another. If, for example, with two diametrically opposed removal beaters, each tooth of one removal beater falls into a gap in the other removal beater, the effort required to keep the grinding chamber free is particularly low, so that blockages cannot occur.

Gemäß weiterer Erfindung wird als Produktzuführung zum Schläger­rad ein in die Mühlentür integrierter Konus vorgesehen. Der sich in Richtung auf das Schlägerrad öffnende Konus verhindert ein Zubacken des Produkteinlasses auch bei einem zum Verkleben neigenden Produkt. Der Außendurchmesser des Konus soll an der dem Schlägerrad zugewandten Seite geringfügig kleiner als der Durchmesser des Schlägerrades sein, um zu vermeiden, daß aus dem am Umfang des Schlägerrades vorgesehenen Mahlraum bereits vermahltes aber nach wie vor zum Verbacken neigendes Produkt in den Einführkonus zurückgedrückt wird. Aus demselben Grunde soll der Abstand zwischen Konus und Schlägerrad so gering, wie ohne gegenseitige Reibung möglich, gehalten werden.According to a further invention, a cone integrated in the mill door is provided as the product feed to the beater wheel. The cone, which opens in the direction of the beater wheel, prevents the product inlet from baking, even if the product tends to stick. The outside diameter of the cone on the side facing the beater wheel should be slightly smaller than the diameter of the beater wheel in order to avoid that from the grinding chamber provided on the periphery of the beater wheel, already ground product, which is still prone to caking, is pressed back into the insertion cone. For the same reason, the distance between the cone and the club wheel should be kept as small as possible without mutual friction.

Mit einer in vorstehender Weise ausgerüsteten und aufgebauten Mühle können Produkte, die zum Verkleben und Anbacken neigen, also beispielsweise die abgesiebten Grobanteile von frisch getrocknetem Waschpulver, störungsfrei ohne Verstopfung des Zu- und Auslaufes sowie ohne Blockaden des Schlägerrades vermahlen werden. Eine solche Mühle eignet sich auch zum Vermahlen weniger klebender Produkte, ihr besonderer Vorteil tritt aber bei Verarbeitung von stark zum Anbacken und Verkleben neigenden Produkten besonders hervor.With a mill equipped and constructed in the above manner, products that tend to stick and bake, i.e., for example, the sifted-off coarse portions of freshly dried washing powder, can be ground trouble-free without clogging the inlet and outlet and without blocking the beater wheel. Such a mill is also suitable for grinding less sticky products, but its particular advantage is particularly evident when processing products that tend to bake and stick.

Die Ausstattung des Schlägerrades mit einem oder mehreren radial vorstehenden Ausräumschlägern ist unabhängig von der Durch­messerdifferenz von Schlägerrad und Innenumfang des Mühlen­gehäuses vorteilhaft. Auch wenn, beispielsweise zum Vermindern der durch die Mühle geförderten Luftmenge, ein relativ kleines Schlägerrad vorgesehen wird, ist es für eine wirtschaftlich befriedigende Standzeit wesentlich, dieses Schlägerrad erfin­dunsgemäß mit mindestens einem in radialer Richtung überste­henden Ausräumschläger auszustatten, der die dem Schlägerrad zugeordnete Mahlbahn auf dem sich an den Innenumfang des Mühlengehäuses anbackenden Produkt selbst bildet und der den Mahlraum dauerhaft freihält. Nach einer relativ kurzen Betriebs­zeit arbeitet eine solche Mühle so, als sei das Mühlengehäuse im Durchmesser vermindert. Dem verkleinerten Schlägerrad müssen die Abmessungen der Produktzuführung angepaßt werden.Equipping the beater wheel with one or more radially projecting removal beaters is advantageous regardless of the difference in diameter between the beater wheel and the inner circumference of the mill housing. Even if, for example, to reduce the amount of air conveyed by the mill, a relatively small beater wheel is provided, it is essential for an economically satisfactory service life to equip this beater wheel according to the invention with at least one removal beater protruding in the radial direction, which removes the grinding path assigned to the beater wheel on the product that cakes itself on the inner circumference of the mill housing and that permanently keeps the grinding chamber clear. After a relatively short operating time, such a mill operates as if the diameter of the mill housing was reduced. The dimensions of the product feed must be adapted to the reduced beater wheel.

Anhand der schematischen Darstellung eines Ausführungsbeispiels werden Einzelheiten der Erfindung erläutert. Es zeigen:

  • Fig. 1 einen Schnitt eines Schlägerrades senkrecht zur Drehachse der Mühle;
  • Fig. 2 einen Schnitt einer Mühle parallel zur Achse des Schlägerrades;
  • Fig. 3 einen Schnitt senkrecht zur Achse der Mühle nach Fig. 2; und
  • Fig. 4 den schematischen Aufbau einer Überschlags­vermahlung von Waschpulver.
Details of the invention are explained on the basis of the schematic representation of an exemplary embodiment. Show it:
  • 1 shows a section of a beater wheel perpendicular to the axis of rotation of the mill.
  • 2 shows a section of a mill parallel to the axis of the beater wheel;
  • 3 shows a section perpendicular to the axis of the mill according to FIG. 2; and
  • Fig. 4 shows the schematic structure of a rollover of washing powder.

In Fig. 1 wird ein innerhalb der am Innenumfang eines Mühlen­gehäuses vorgesehenen Mahlbahn 1 um eine horizontale Achse 2 drehbar gelagertes Schlägerrad 3 einer Schlagmühle im Prinzip dargestellt. Das Schlägerrad 3 besitzt eine Vielzahl von Schlägern 4, die den bei Rotation definierten Umfang 6 des Schlägerrades 3 mit ihrer peripheren Kante beschreiben.1 shows, in principle, a beater wheel 3 of a beater mill which is rotatably mounted about a horizontal axis 2 within the grinding track 1 provided on the inner circumference of a mill housing. The beater wheel 3 has a plurality of beaters 4 which describe the circumference 6 of the beater wheel 3 defined during rotation with its peripheral edge.

Um einen Mahlraum 8 zwischen Mahlbahn 1 und Umfang 6 freizu­halten, werden im Ausführungsbeispiel zwei Schläger in der Funktion als Ausräumschläger 9 in radialer Richtung so weit ver­größert, daß sie bis an die (vorgesehene) Mahlbahn 1 heran­reichen. Wenn also die Mahlbahn 1 nicht unmittelbar durch das Material des Mühlengehäuses sondern durch anbackendes Produkt gebildet wird, bestimmen die peripheren Kanten 10 der Ausräum­schläger 9 die Mahlbahn 1.In order to keep a grinding chamber 8 between grinding track 1 and circumference 6 free, in the exemplary embodiment two beaters in the function as clearing beater 9 are enlarged in the radial direction to such an extent that they reach the (provided) grinding track 1. If the grinding track 1 is therefore not formed directly by the material of the mill housing but by caking product, the peripheral edges 10 of the removal beaters 9 determine the grinding track 1.

Ein Ausführungsbeispiel einer Schlagmühle wird anhand der Fig. 2 und 3 erläutert. Die Mühle besitzt ein Mühlengehäuse 11, innerhalb dessen ein Schlägerrad 3 rotierbar um eine Achse 2 gelagert wird. Das Schlägerrad 3 wird über ein Welle 12 von außerhalb angetrieben. Es besitzt eine Vielzahl von Schlägern 4 und diametral zwei über seinen Umfang 6 überstehende Ausräum­schläger 9, die den Mahlraum 8 und damit die Mahlbahn 1 frei­halten oder bzw. definieren.An embodiment of a hammer mill is explained with reference to FIGS. 2 and 3. The mill has a mill housing 11, within which a beater wheel 3 is rotatably mounted about an axis 2. The beater wheel 3 is driven from outside via a shaft 12. It has a large number of clubs 4 and diametrically two clearing beaters 9 projecting over its circumference 6, which keep or define the grinding chamber 8 and thus the grinding track 1.

Die im Ausführungsbeispiel vorgesehenen Ausräumschläger 9 be­sitzen nach Fig. 2 eine Verzahnung 13, deren Zähne 14 und Lücken 15 so gegeneinander versetzt sind, daß in Umfangsrich­tung immer ein Zahn 14 und eine Lücke 15 zusammentreffen.The removal racket 9 provided in the exemplary embodiment has a toothing 13 according to FIG. 2, the teeth 14 and gaps 15 of which are offset from one another such that a tooth 14 and a gap 15 always meet in the circumferential direction.

Der Schnitt von Fig. 2 zeigt auch eine insgesamt mit 16 bezeich­nete Produktzuführung, die in eine Mühlentür 17 integriert und als zum Schlägerrad 3 hin geöffneter Konus 18 ausgebildet wird. Der Außendurchmesser d des Konus 18 an seiner dem Schlägerrad 3 zugewandten Seite soll geringfügig kleiner sein als der Durch­messer D des Schlägerrades 3. Außerdem wird der Abstand a zwischen Konus 18 und Schlägerrad 3 so gering wie möglich ge­halten. Durch die Wahl der relativen Größen d/D und durch den möglichst kleinen Abstand a wird verhindert, daß aus dem Mahl­raum 8 frisches und nach wie vor zum Verbacken neigendes Mahl­gut in die Produktzuführung 16 zurückgedrückt wird und die Zu­führung verstopfen kann. Das Mahlgut soll normalerweise in ra­dialer Richtung, beispielsweise - wie in Fig. 2 dargestellt - durch einen an der Unterseite vorgesehenen Ausgang 19 in Pfeilrichtung abgeführt werden.The section of FIG. 2 also shows a product feed, designated overall by 16, which is integrated in a mill door 17 and is designed as a cone 18 which is open towards the beater wheel 3. The outer diameter d of the cone 18 on its side facing the beater wheel 3 should be slightly smaller than the diameter D of the beater wheel 3. In addition, the distance a between the cone 18 and beater wheel 3 is kept as small as possible. The choice of the relative sizes d / D and the smallest possible distance a prevent fresh material from the grinding chamber 8, which is still prone to caking, from being pressed back into the product feed 16 and from clogging the feed. The regrind should normally be discharged in the radial direction, for example — as shown in FIG. 2 — through an outlet 19 provided on the underside in the direction of the arrow.

Fig. 4. zeigt ein Beispiel einer Anwendung der Schlagmühle nach Fig. 1 bis 3. Bei der Herstellung von Waschmitteln im Sprühtrocknungsverfahren entsteht ein Turmpulver mit breitem Kornspektrum und gemischt mit Agglomeraten, Bruchstücken und Wandansätzen im Austrag des Trockners. Zum Erreichen eines qualitätsgerechten Kornspektrums werden die Grobanteile des Turmpulvers als Überschlag abgesiebt. Sie gelangen beispielsweise vom Sieb 20 5. G (G = Obergeschoß) eines Trockenturms in eine erfindungsgemäße Mühle 21, die sich beispielsweise im 4. G des Trockenturms befinden kann. Der Auslauf der Mühle 21 kann im 3. G mit einer Leitung 23, die das Mahlprodukt zurück zum im 2. G des Trockenturms befindlichen Turmaustragsband 25 führt, verbunden werden. Zusammen mit dem in Pfeilrichtung 26 herantransportierten Turmpulver 27 wird es dann in einer Förderanlage 28 erneut in Pfeilrichtung 29 zu den Sieben des Turms gefördert und danach ein zweites Mal auf dem Sieb 20 abgesiebt, so daß noch zu grobe Teile erneut abgetrennt und vermahlen werden können.Fig. 4. shows an example of an application of the impact mill according to Fig. 1 to 3. In the production of detergents in the spray drying process, a tower powder with a broad grain spectrum and mixed with agglomerates, fragments and wall deposits is produced in the discharge of the dryer. In order to achieve a quality-related grain spectrum, the coarse fractions of the tower powder are sieved off as a flap. You get, for example, from the screen 20 5th G (G = upper floor) of a drying tower into one Mill 21 according to the invention, which can be located, for example, in the 4th G of the drying tower. The outlet of the mill 21 can be connected in the 3rd G to a line 23 which leads the ground product back to the tower discharge belt 25 located in the 2nd G of the drying tower. Together with the tower powder 27 transported in the direction of the arrow 26, it is then conveyed in a conveyor system 28 again in the direction of the arrow 29 to the sieves of the tower and then sieved a second time on the sieve 20, so that even coarse parts can be separated and ground again.

BezugszeichenlisteReference symbol list

  • 1 = Mahlbahn1 = grinding track
  • 2 = Achse2 = axis
  • 3 = Schlägerrad3 = bat wheel
  • 4 = Schläger4 = racket
  • 6 = Umfang (3)6 = scope (3)
  • 7 = periphere Kante (4)7 = peripheral edge (4)
  • 8 = Mahlraum8 = grinding room
  • 9 = Ausräumschläger9 = removal racket
  • 10 = periphere Kante (9)10 = peripheral edge (9)
  • 11 = Mühlengehäuse11 = mill housing
  • 12 = Welle12 = wave
  • 13 = Verzahnung13 = toothing
  • 14 = Zahn14 = tooth
  • 15 = Lücke15 = gap
  • 16 = Produktzuführung16 = product feed
  • 17 = Mühlentür17 = mill door
  • 18 = Konus18 = cone
  • 19 = Ausgang19 = exit
  • 20 = Sieb20 = sieve
  • 21 = Mühle21 = grinder
  • 23 = Leitung23 = line
  • 25 = Turmaustragsband25 = tower discharge conveyor
  • 26 = Pfeil26 = arrow
  • 27 = Turmpulver27 = tower powder
  • 28 = Förderanlage28 = conveyor system
  • 29 = Pfeil29 = arrow

Claims (9)

1. Schlagmühle mit einem in einem Mühlengehäuse (11) auf einer horizontalen Achse (2) gelagerten Schlägerrad (3), wobei der Umfang (6) des Schlägerrades (3) mit einer Vielzahl etwa radial ausgerichteter Schläger (4) bestückt ist und den Schlägern (4) am Innenumfang des Mühlengehäuses (11) eine vom Produkt gebildete Mahlbahn (1) gegenübersteht und wobei das Mühlengehäuse (11) eine etwa senkrecht zu der horizon­talen Achse (2) stehende Mühlentür (17) besitzt,
dadurch gekennzeichnet, daß den Schlägern (4) direkt die vom Produkt gebildete Mahl­bahn (1) gegenübersteht und mindestens ein Schläger in der Funktion als Ausräumschläger (9) radial weiter nach außen vorspringt als der Rest der Schläger (4).1. beater mill with a beater wheel (3) mounted in a mill housing (11) on a horizontal axis (2), the periphery (6) of the beater wheel (3) being equipped with a plurality of approximately radially oriented beaters (4) and the beaters (4) on the inner circumference of the mill housing (11) is opposed by a grinding path (1) formed by the product and the mill housing (11) has a mill door (17) approximately perpendicular to the horizontal axis (2),
characterized in that the beaters (4) are directly opposite the grinding track (1) formed by the product and at least one beater in the function as a clearing beater (9) projects radially further outwards than the rest of the beaters (4). 2. Mühle nach Anspruch 1,
dadurch gekennzeichnet, daß zwei oder mehr symmetrisch am Schlägerrad (3) verteilte Schläger (4) als Ausräumschläger (9) radial weiter nach außen vorspringen als der Rest der Schläger (4).2. Mill according to claim 1,
characterized in that two or more rackets (4) distributed symmetrically on the racket wheel (3) project radially outward as a clearing racket (9) than the rest of the rackets (4). 3. Mühle nach Anspruch 2,
dadurch gekennzeichnet, daß die Ausräumschläger (9) an ihrer peripheren Kante (10) verzahnt sind.3. Mill according to claim 2,
characterized in that the removal beaters (9) are toothed on their peripheral edge (10). 4. Mühle nach Anspruch 3,
dadurch gekennzeichnet, daß die Zähne (14) der Verzahnung (13) der Ausräumschlä­ger (9) gegeneinander versetzt sind.4. Mill according to claim 3,
characterized in that the teeth (14) of the toothing (13) of the removal beaters (9) are offset from one another. 5. Mühle nach Anspruch 4,
dadurch gekennzeichnet, daß bei zwei diametral gegenüberstehenden Ausräumschlägern (9) jeder Zahn (14) des einen Ausräumschlägers (9) in eine Lücke (15) des anderen Ausräumschlägers (9) fällt.5. Mill according to claim 4,
characterized in that in the case of two diametrically opposed removal beaters (9) each tooth (14) of the one removal beater (9) falls into a gap (15) of the other removal beater (9). 6. Mühle nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, daß als Produktzuführung (16) zum Schlägerrad (3) ein in die Mühlentür (17) integrierter Konus (18) vorgesehen ist.6. Mill according to one of claims 1 to 5,
characterized in that a cone (18) integrated in the mill door (17) is provided as the product feed (16) to the beater wheel (3). 7. Mühle nach Anspruch 6,
dadurch gekennzeichnet, daß der Außendurchmesser (d) des Konus (18) an seiner dem Schlägerrad (3) zugewandten Seite kleiner als der Durchmesser (D) des Schlägerrades (3) ist.7. Mill according to claim 6,
characterized in that the outer diameter (d) of the cone (18) on its side facing the racket wheel (3) is smaller than the diameter (D) of the racket wheel (3). 8. Mühle nach Anspruch 6 oder 7,
dadurch gekennzeichnet, daß der Abstand (a) zwischen Konus (18) und Schlägerrad (3) so klein wie ohne störende Reibung gerade möglich vorgegeben ist.8. Mill according to claim 6 or 7,
characterized in that the distance (a) between the cone (18) and the beater wheel (3) is predetermined to be as small as possible without disturbing friction. 9. Mühle nach einem der vorangehenden Ansprüche,
dadurch gekennzeichnet, daß die Mühle zum Zerkleinern von Waschpulveranteilen in den Prozeß der Waschmittelsprühtrocknung integriert angeordnet ist.9. Mill according to one of the preceding claims,
characterized in that the mill for shredding washing powder is integrated in the process of detergent spray drying.
EP89113525A 1988-07-30 1989-07-22 Impact mill Expired - Lifetime EP0353576B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89113525T ATE86145T1 (en) 1988-07-30 1989-07-22 BEAT MILL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3826039A DE3826039A1 (en) 1988-07-30 1988-07-30 WHEELMILL
DE3826039 1988-07-30

Publications (3)

Publication Number Publication Date
EP0353576A2 true EP0353576A2 (en) 1990-02-07
EP0353576A3 EP0353576A3 (en) 1990-10-10
EP0353576B1 EP0353576B1 (en) 1993-03-03

Family

ID=6359975

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89113525A Expired - Lifetime EP0353576B1 (en) 1988-07-30 1989-07-22 Impact mill

Country Status (6)

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EP (1) EP0353576B1 (en)
AT (1) ATE86145T1 (en)
DE (2) DE3826039A1 (en)
DK (1) DK367089A (en)
ES (1) ES2040939T3 (en)
TR (1) TR24776A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993003845A1 (en) * 1991-08-13 1993-03-04 I.L.I.D. S.A.S. Di Paolini Michele & C. A system for the machining of inert materials for the production of sand or granulates in general, applicable to the rotors of both reversible and non-reversible hammer mills
WO1994002248A1 (en) * 1992-07-20 1994-02-03 Henkel Kommanditgesellschaft Auf Aktien Method of reducing soft or medium-hard materials in size, and an impact pulverizer suitable for doing this
US5407273A (en) * 1991-05-11 1995-04-18 Gebrueder Loedige Double bladed mixing instrument with axially displaced blades
WO1996014157A1 (en) * 1994-11-04 1996-05-17 Henkel Kommanditgesellschaft Auf Aktien Impact mill for adhesive products

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU703411B2 (en) * 1995-01-06 1999-03-25 Svedala New Zealand Limited Improved rotor design

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE739463C (en) * 1942-01-16 1943-09-27 Johann Kassmann Beaters for blow bar mills
GB754659A (en) * 1953-08-27 1956-08-08 Ludwig Pallmann Centrifugal mill
US2999652A (en) * 1959-07-27 1961-09-12 Ervin J Dear Ore pulverizing mill with centrifugal impact pulverizing action
CH568794A5 (en) * 1973-08-14 1975-11-14 Aebi & Co Ag
US4093127A (en) * 1975-10-21 1978-06-06 Life Resources Incorporated Disintegrator and separator apparatus
US4635863A (en) * 1984-07-09 1987-01-13 Aggregates Equipment, Inc. Reversible, axially fed, cage rotor impact breaker
GB2184042A (en) * 1985-12-13 1987-06-17 Peabody Holmes Ltd Mineral crushing equipment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE739463C (en) * 1942-01-16 1943-09-27 Johann Kassmann Beaters for blow bar mills
GB754659A (en) * 1953-08-27 1956-08-08 Ludwig Pallmann Centrifugal mill
US2999652A (en) * 1959-07-27 1961-09-12 Ervin J Dear Ore pulverizing mill with centrifugal impact pulverizing action
CH568794A5 (en) * 1973-08-14 1975-11-14 Aebi & Co Ag
US4093127A (en) * 1975-10-21 1978-06-06 Life Resources Incorporated Disintegrator and separator apparatus
US4635863A (en) * 1984-07-09 1987-01-13 Aggregates Equipment, Inc. Reversible, axially fed, cage rotor impact breaker
GB2184042A (en) * 1985-12-13 1987-06-17 Peabody Holmes Ltd Mineral crushing equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5407273A (en) * 1991-05-11 1995-04-18 Gebrueder Loedige Double bladed mixing instrument with axially displaced blades
WO1993003845A1 (en) * 1991-08-13 1993-03-04 I.L.I.D. S.A.S. Di Paolini Michele & C. A system for the machining of inert materials for the production of sand or granulates in general, applicable to the rotors of both reversible and non-reversible hammer mills
WO1994002248A1 (en) * 1992-07-20 1994-02-03 Henkel Kommanditgesellschaft Auf Aktien Method of reducing soft or medium-hard materials in size, and an impact pulverizer suitable for doing this
WO1996014157A1 (en) * 1994-11-04 1996-05-17 Henkel Kommanditgesellschaft Auf Aktien Impact mill for adhesive products

Also Published As

Publication number Publication date
DE3826039C2 (en) 1990-11-22
ATE86145T1 (en) 1993-03-15
DE3826039A1 (en) 1990-02-01
TR24776A (en) 1992-03-09
EP0353576B1 (en) 1993-03-03
EP0353576A3 (en) 1990-10-10
DK367089A (en) 1990-01-31
DE58903639D1 (en) 1993-04-08
DK367089D0 (en) 1989-07-25
ES2040939T3 (en) 1993-11-01

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