EP0692309B1 - Process for impactmilling and impactmill - Google Patents

Process for impactmilling and impactmill Download PDF

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Publication number
EP0692309B1
EP0692309B1 EP95108931A EP95108931A EP0692309B1 EP 0692309 B1 EP0692309 B1 EP 0692309B1 EP 95108931 A EP95108931 A EP 95108931A EP 95108931 A EP95108931 A EP 95108931A EP 0692309 B1 EP0692309 B1 EP 0692309B1
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EP
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Prior art keywords
blades
rotor
mill
impact
chamber
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EP95108931A
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German (de)
French (fr)
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EP0692309A1 (en
Inventor
Guido Krämer
Eugen Chrapatsch
Volodia Chrapatsch
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Buehler AG
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Buehler AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/20—Disintegrating by mills having rotary beater elements ; Hammer mills with two or more co-operating rotors
    • B02C13/205—Disintegrating by mills having rotary beater elements ; Hammer mills with two or more co-operating rotors arranged concentrically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material

Definitions

  • the invention relates in particular to a method for impact milling of granular regrind such as grain or cubes the preamble of claim 1 and an impact mill with coaxial rotating rotors driven in opposite directions after the Preamble of claim 4.
  • It is particularly used for grinding regrind for animal feed.
  • impact mills have a fixed housing a rotor arranged and driven therein. It is also known disintegrators for very fine comminution with two coaxial, counter-rotating drives Form rotors (DE-A-3417556).
  • the rotors each carry at least two concentric blade rings, the Interchangeably intermesh blade rings of both rotors. Both rotors are driven by a common one Drive.
  • the one rotor is on a hollow shaft attached and the other rotor via a socket on one that Hollow shaft penetrating shaft arranged. Both waves are stored in an outdoor storage.
  • the high design effort is required to create a turbo effect according to EP-A-48012 to achieve with safe storage function.
  • the invention has for its object a method for Impact grinding of granular regrind and an impact mill for Implementation of the procedure to create the low technical and economic effort a high degree of uniformity the grinding of the ground material (low scatter of the Particle size) with a minimal content of dust fractions. This is done in a surprisingly simple way by the features of the characterizing part of claim 1 or 2.
  • the regrind is first in a rotating movement accelerated and subsequently bounced by converting the speed vector into one of the acceleration opposite vector. Acceleration and Impact alternate cyclically in two intermediate zones, which are not yet comminuted enough by currents Particles are associated with excretion of particles desired size between cycles.
  • the regrind is passed to a first grinding stage, where it is accelerated in a defined direction and against one Surface of working organs bounces. Under the impact the regrind grains are in particles of different sizes communicating the opposite of the acceleration Shredded speed vector. Then the shredded Particles on a separator, where appropriate be separated. The separator is outside the shredding zone arranged and the particles approach tangentially on. The particles of the desired size are used as a finished product dissipated, coarse particles get into the Shredding zone to a second shredding stage and are subjected to acceleration and impact again however, unlike the first stage, finer Particles are created. A separation follows again in coarse and finished product outside the shredding zone, the coarse product again the first size reduction is fed.
  • the shredding cycle is closed and the separation the particle occurs outside of what is both a subsidence of energy consumption and wear and tear Separation device allowed. At the same time it becomes a differentiated Treatment of different sized particles achieved.
  • the use of two shredding levels allowed an influence on particles with different processing intensity at every stage.
  • the process can be carried out in an impact or impact mill with a cylindrical Chamber with inlet and outlet nozzle for the Regrind as well as coaxially installed rotors in it attached work organs in the opposite direction rotate, run.
  • the chamber is perforated executed and divided into two chamber areas by means of the rotors, with the areas crossing each other Channels are connected that are outside their limits are arranged and the a closed flow of the Result in ground material.
  • the result is a closed grinding process with a predefinable one Particle size and the possibility of automatic Control the process.
  • An impact mill is fed with the material to be ground. This enters an in free fall via an inlet 2 first working area 12 of a chamber 4.
  • This is the regrind under the influence of a, by a rotary movement of a Rotor 6 generated airflow on a first row of blades 7 of the rotor 6 passed.
  • the individual grains of the ground material are captured by these blades 7, accelerated and against blades 9 of a rotor 8 at high speed thrown.
  • the blades 9 are located between the first and a second row of blades 7 of the rotor 6.
  • the number of transfer stages of the coarse fractions from the work area 12 in the work area 13 depends on the art of the ground material, its moisture and the intensity of the Impact.
  • a housing 1 of the impact mill In a housing 1 of the impact mill are horizontal and coaxial Rotors 6 and 8 with blades 7 and 9 attached thereto.
  • the rotors 6, 8 of surround a sieve 5, whereby a cylindrical chamber 4, the divided into two working areas 12 and 13 by the rotors 6, 8 is, is formed.
  • the rotors 6, 8 are driven by electric motors 10 and 11.
  • the rotor 6 has two rows and the rotor 8 has a row of blades 7, 9 divided with the rotor disk in half is. One half of the blades 9 of the rotor 8 is between arranged the rows of blades of the rotor 6.
  • An inlet 2 which is located on the side of the working area 12 on the housing 1 is arranged, is used to feed the impact mill with regrind.
  • channels 14 and 15 are on the housing 1 arranged to return the insufficiently shredded (coarse) particle fractions.
  • the channels 14, 15 are outside the chamber 4 arranged.
  • the width corresponds to that Channel 14 of the width of the row of blades 7 of the rotor 6, which is arranged closer to axis 16.
  • Channel 14 has one curved, curvilinear shape, starting from chamber 4 and laterally and centrally opening into work area 13.
  • Analogous Channel 15 is designed. He also leaves the chamber 4 and flows out laterally and centrally into the work area 12th
  • the size of the gap between the ends of the blades 7 and the sieve 5 is dimensioned so that the movement of the shredded Product on the screen 5 under the action of centrifugal force without direct influence from the outside Buckets 7 takes place.
  • the angle of attack of the blades 7, 9 is correspondingly small to choose the described, wear-reducing movement path of the particles.
  • the electric motors 10, 11 are loaded approximately the same.
  • the perforated part of the chamber 4 is removable to one To allow screen changes.
  • the perforated part of the chamber 4 should also be as possible take up a large part of their cylindrical surface, to achieve an efficient separation process.
  • the number of grinding stages can be increased be, e.g. B. on seven stages, the rotor 6 then three and the rotor 8 has two rows of blades 7, 9.
  • the impact mill is used for grinding grain into flour possible as B1 and B2 passage.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Prallvermahlung insbesondere von körnigem Mahlgut wie Getreide oder Würfel nach dem Oberbegriff des Anspruchs 1 und eine Prallmühle mit koaxial gegensinnig umlaufenden, angetriebenen Rotoren nach dem Oberbegriff des Anspruchs 4.The invention relates in particular to a method for impact milling of granular regrind such as grain or cubes the preamble of claim 1 and an impact mill with coaxial rotating rotors driven in opposite directions after the Preamble of claim 4.

Sie findet insbesondere Anwendung zur Vermahlung von Mahlgut für Tierfutter.It is particularly used for grinding regrind for animal feed.

Bei herkömmlichen Schlagmühlen (siehe z. B. EP-B-51389 oder DE-A-3708914) wird die Feinheit des Produkts weitgehend von der Sieblochung (Siebfeinheit) bestimmt, wobei das Mahlgut solange im Mahlraum verbleibt, bis ein Passieren des Siebes möglich wird. Das Mahlgut wird einer Vielzahl von Schlägen des/der Rotors/Rotoren ausgesetzt, bis die entsprechende Feinheit erreicht ist. Dies bedingt einen hohen Energieaufwand und ein teilweise übermässiges Zerkleinern des Mahlgutes.With conventional impact mills (see e.g. EP-B-51389 or DE-A-3708914) the fineness of the product is largely determined by the sieve perforation (sieve fineness) is determined, whereby the regrind remains in the grinding chamber until the sieve passes becomes possible. The regrind is subjected to a variety of strokes of the rotor / rotors exposed until the corresponding Fineness is reached. This requires a high amount of energy and a partial excessive grinding of the ground material.

Ist das Sieb im Schlagraum angeordnet, wie z. B. gemäss der EP-B-98441, bei der der Rotor einer Schlagmühle konzentrisch von einem Sieb umgeben ist, trifft das Mahlgut mit hoher Geschwindigkeit auf den Siebmantel, was den Siebverschleiss erhöht.Is the sieve arranged in the impact area, such as. B. according to the EP-B-98441, in which the rotor of a hammer mill is concentric surrounded by a sieve, the regrind hits at high speed on the screen jacket, which increases screen wear.

Zur Verbesserung der Energiebilanz derartiger Schlagmühlen wurden auch Schleuderkanäle vorgeschlagen (siehe DE-PS-699100 und DE-A-3708914), um die den Mahlgutteilchen erteilte Energie zum Fördern derselben aus dem Schlagraum heraus auf ein anschliessendes Sieb zu nutzen. Auch bei derartigen tangentialen Schleuderkanälen wird das Mahlgut auf das Sieb geworfen. To improve the energy balance of such impact mills Spin channels have also been proposed (see DE-PS-699100 and DE-A-3708914) about the energy imparted to the regrind particles to convey the same out of the impact area then use a sieve. Even with such tangentials The regrind is thrown onto the sieve by centrifugal channels.

Zumeist weisen Schlagmühlen ein feststehendes Gehäuse mit einem, darin angeordneten und angetriebenen Rotor auf. Es ist darüberhinaus bekannt, Desintegratoren zur Feinstzerkleinerung mit zwei koaxialen, gegensinnig umlaufend angetriebenen Rotoren auszubilden (DE-A-3417556). Die Rotoren tragen jeweils mindestens zwei konzentrische Schaufelkränze, wobei die Schaufelkränze beider Rotoren alternierend ineinander greifen. Der Antrieb beider Rotoren erfolgt durch einen gemeinsamen Antrieb. Hierzu ist der eine Rotor an einer Hohlwelle befestigt und der andere Rotor über eine Buchse an einer, die Hohlwelle durchsetzende Welle angeordnet. Beide Wellen sind in einer Aussenlagerung gelagert. Der hohe konstruktive Aufwand ist erforderlich, um einen Turboeffekt gemäss EP-A-48012 bei sicherer Lagerfunktion zu erzielen.Mostly, impact mills have a fixed housing a rotor arranged and driven therein. It is also known disintegrators for very fine comminution with two coaxial, counter-rotating drives Form rotors (DE-A-3417556). The rotors each carry at least two concentric blade rings, the Interchangeably intermesh blade rings of both rotors. Both rotors are driven by a common one Drive. For this purpose, the one rotor is on a hollow shaft attached and the other rotor via a socket on one that Hollow shaft penetrating shaft arranged. Both waves are stored in an outdoor storage. The high design effort is required to create a turbo effect according to EP-A-48012 to achieve with safe storage function.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Prallvermahlung von körnigem Mahlgut und eine Prallmühle zur Durchführung des Verfahrens zu schaffen, die bei geringem technischen und wirtschaftlichen Aufwand eine hohe Gleichmässigkeit der Vermahlung des Mahlgutes (geringe Streuung der Teilchengrösse) mit minimalem Gehalt an Staubfraktionen ermöglicht. Dies geschieht in überraschend einfacher Weise durch die Merkmale des Kennzeichens des Anspruchs 1 bzw. 2.The invention has for its object a method for Impact grinding of granular regrind and an impact mill for Implementation of the procedure to create the low technical and economic effort a high degree of uniformity the grinding of the ground material (low scatter of the Particle size) with a minimal content of dust fractions. This is done in a surprisingly simple way by the features of the characterizing part of claim 1 or 2.

Die übliche Vermahlung von Mahlgut in einer Mehrzahl von Zerkleinerungsvorrichtungen (hohe Reibung) führt zur teilweise übermässigen Zerkleinerung des Produktes und hohem Energieverbrauch, in Verbindung mit vergleichsweise hohem Verschleiss. Dies resultiert daraus, dass die Auflösung des Mahlgutes vorrangig in der sich bewegenden Schicht zwischen den Enden der Schläger und der Sieboberfläche/Siebkammer. Beim Turbo-effekt auch Prallung zwischen den Teilchen selbst. Überraschend zeigte sich nun, dass durch Anwendung einer "reinen" Prallung die Nachteile des bekannten Standes der Technik vermieden werden können. Erfindungsgemäss wird das Mahlgut zunächst beschleunigt und prallt nachfolgend gegen Arbeitsorgane. Da hierzu Geschwindigkeiten von über 100 m/s erforderlich sind, wird ein Maximum an Zerkleinerung bei minimaler Reibung durch eine Gegenprallung des beschleunigten Mahlgutes durch eine an sich bekannte Bewegung in entgegengesetzter Richtung erreicht. Das Mahlgut wird zunächst in einer rotierenden Bewegung beschleunigt und nachfolgend geprallt durch Umwandlung des Geschwindigkeitsvektors in einen der Beschleunigung entgegengesetzten Vektor. Beschleunigung und Prallung wechseln sich zyklisch in zwei Zwischenzonen ab, welche miteinander durch Ströme noch nicht genügend zerkleinerter Teilchen verbunden sind, mit Ausscheidung von Teilchen gewünschter Grösse zwischen den Zyklen.The usual grinding of regrind in a plurality of crushing devices (high friction) leads to partial excessive shredding of the product and high energy consumption, in connection with comparatively high wear. This results from the fact that the resolution of the Grist primarily in the moving layer between the ends of the beaters and the sieve surface / sieve chamber. With the turbo effect, the impact between the particles themselves. Surprisingly, it has now been shown that by using a "Pure" impact the disadvantages of the known state of the art Technology can be avoided. According to the invention Grist initially accelerates and then bounces against Work organs. Since speeds of over 100 m / s maximum shredding with minimal Friction due to a collision of the accelerated Grist through a known movement in opposite directions Direction reached. The regrind is first in a rotating movement accelerated and subsequently bounced by converting the speed vector into one of the acceleration opposite vector. Acceleration and Impact alternate cyclically in two intermediate zones, which are not yet comminuted enough by currents Particles are associated with excretion of particles desired size between cycles.

Das Mahlgut wird auf eine erste Vermahlungsstufe geleitet, wo es in definierter Richtung beschleunigt wird und gegen eine Fläche von Arbeitsorganen prallt. Unter der Schlageinwirkung werden die Mahlgutkörner in Teilchen unterschiedlicher Grösse unter Übermittlung des der Beschleunigung entgegengesetzten Geschwindigkeitsvektors zerkleinert. Danach gelangen die zerkleinerten Teilchen auf einen Separator, wo sie entsprechend separiert werden. Der Separator ist ausserhalb der Zerkleinerungszone angeordnet und die Teilchen nähern sich tangential an. Die Teilchen gewünschter Grösse werden als Fertigprodukt abgeführt, grobe Teilchen gelangen durch Rückführung in die Zerkleinerungszone auf eine zweite Zerkleinerungsstufe und werden dort erneut einer Beschleunigung und Prallung unterworfen, wobei jedoch, im Unterschied zur ersten Stufe, feinere Teilchen entstehen. Es folgt wiederum eine Separierung in Grob- und Fertigprodukt ausserhalb der Zerkleinerungszone, wobei das Grobprodukt erneut der ersten Zerkleinerungsstufe zugeführt wird.The regrind is passed to a first grinding stage, where it is accelerated in a defined direction and against one Surface of working organs bounces. Under the impact the regrind grains are in particles of different sizes communicating the opposite of the acceleration Shredded speed vector. Then the shredded Particles on a separator, where appropriate be separated. The separator is outside the shredding zone arranged and the particles approach tangentially on. The particles of the desired size are used as a finished product dissipated, coarse particles get into the Shredding zone to a second shredding stage and are subjected to acceleration and impact again however, unlike the first stage, finer Particles are created. A separation follows again in coarse and finished product outside the shredding zone, the coarse product again the first size reduction is fed.

Der Zerkleinerungszyklus ist geschlossen und die Separierung der Teilchen erfolgt ausserhalb dessen, was sowohl eine Senkung des Energieverbrauchs als auch des Verschleisses der Separiereinrichtung gestattet. Gleichzeitig wird eine differenzierte Behandlung von unterschiedlich grossen Teilchen erreicht. Die Verwendung von zwei Zerkleinerungsstufen erlaubt eine Einflussnahme auf Teilchen mit abweichender Bearbeitungsintensität in jeder Stufe. The shredding cycle is closed and the separation the particle occurs outside of what is both a subsidence of energy consumption and wear and tear Separation device allowed. At the same time it becomes a differentiated Treatment of different sized particles achieved. The use of two shredding levels allowed an influence on particles with different processing intensity at every stage.

Das Verfahren kann in einer Prall- bzw. Schlagmühle mit zylindrischer Kammer, die mit Ein- und Auslasstutzen für das Mahlgut sowie darin koaxial installierten Rotoren, die mit daran befestigten Arbeitsorganen in entgegengesetzter Richtung drehen, ausgeführt werden. Die Kammer ist perforiert ausgeführt und mittels der Rotoren in zwei Kammerbereiche unterteilt, wobei die Bereiche untereinander durch sich kreuzende Kanäle verbunden sind, die ausserhalb ihrer Begrenzungen angeordnet sind und die einen geschlossenen Fluss des Mahlgutes ergeben.The process can be carried out in an impact or impact mill with a cylindrical Chamber with inlet and outlet nozzle for the Regrind as well as coaxially installed rotors in it attached work organs in the opposite direction rotate, run. The chamber is perforated executed and divided into two chamber areas by means of the rotors, with the areas crossing each other Channels are connected that are outside their limits are arranged and the a closed flow of the Result in ground material.

Es ergibt sich ein geschlossener Vermahlungsprozess mit vorgebbarer Teilchengrösse und der Möglichkeit der automatischen Steuerung des Prozesses.The result is a closed grinding process with a predefinable one Particle size and the possibility of automatic Control the process.

Die Erfindung wird nachfolgend an einem Ausführungsbeispiel an Hand einer Zeichnung näher beschrieben. In der Zeichnung zeigen die

Fig. 1:
eine Prallmühle
Fig. 2:
einen Schnitt A-A der Prallmühle
Fig. 3:
einen Schnitt B-B der Prallmühle
The invention is described below using an exemplary embodiment with reference to a drawing. In the drawing they show
Fig. 1:
an impact mill
Fig. 2:
a section AA of the impact mill
Fig. 3:
a section BB of the impact mill

Eine Prallmühle wird mit dem zu vermahlenden Gut gespeist. Dieses gelangt über einen Einlass 2 im freien Fall in einen ersten Arbeitsbereich 12 einer Kammer 4. Hier wird das Mahlgut unter der Einwirkung eines, durch eine Drehbewegung eines Rotors 6 erzeugten Luftstrom auf eine erste Reihe von Schaufeln 7 des Rotors 6 geleitet. Die einzelnen Körner des Mahlgutes werden von diesen Schaufeln 7 erfasst, beschleunigt und mit hoher Geschwindigkeit gegen Schaufeln 9 eines Rotors 8 geworfen. Die Schaufeln 9 befinden sich zwischen der ersten und einer zweiten Reihen von Schaufeln 7 des Rotors 6. An impact mill is fed with the material to be ground. This enters an in free fall via an inlet 2 first working area 12 of a chamber 4. Here is the regrind under the influence of a, by a rotary movement of a Rotor 6 generated airflow on a first row of blades 7 of the rotor 6 passed. The individual grains of the ground material are captured by these blades 7, accelerated and against blades 9 of a rotor 8 at high speed thrown. The blades 9 are located between the first and a second row of blades 7 of the rotor 6.

Infolge der Prallung der Körner gegen die Schaufeln 9 des Rotors 8, der sich in entgegengesetzter Richtung zum Rotor 6 dreht, werden die Körner teilweise zerkleinert, mittels der Schaufeln 9 erneut beschleunigt und gegen die zweite, äussere Reihe der Schaufeln 7 geschleudert. Infolge Prallwirkung an den Schaufeln 7 erfolgt eine weitere Zerkleinerung der Körner in Teilchen unterschiedlicher verschiedener Feinheit. Diese gelangen von den Schaufeln 7 in Drehrichtung des Rotors 6 bahnförmig auf die Oberfläche des Siebes 5. Während sich die Teilchen in einem Luftpolster reibungsarm in Drehrichtung des Rotors 6 auf der Oberfläche des Siebes 5 bewegen, erfolgt unter Einwirkung von Zentrifugalkraft und des Luftstromes eine Separierung in eine grobe und eine Feinfraktion. Teilchen, die die Öffnungen des Siebes 5 passieren, verlassen die Schlagmühle über einen Auslass 3, während gröbere Teilchen infolge weiterer Bewegung in einen seitlichen Kanal 14 und von dort in einen zweiten Arbeitsbereich 13 der Kammer 4 gelangen. Unter Einwirkung der derselben Kräfte wie im Arbeitsbereich 12, werden die Teilchen von den Schaufeln 9 erfasst und gegen die Schaufeln 7 geschleudert. Auf Grund der Prallung erfolgt eine zusätzliche Zerkleinerung der Teilchen, welche, die Schaufeln 7 verlassend, sich in Drehrichtung des Rotors 6 wieder auf der Oberfläche des Siebes 5 bewegen. Die Feinfraktion wird wiederum nach Passieren des Siebes 5 über den Auslass 3 ausgetragen. Die noch verbleibende Grobfraktion kann über den Kanal 15 einer weiteren Vermahlung zugeführt werden.As a result of the impact of the grains against the blades 9 of the rotor 8, which is in the opposite direction to the rotor 6 rotates, the grains are partially crushed by means of the Paddles 9 accelerated again and against the second, outer Row of blades 7 hurled. As a result of impact The blades 7 are further comminuted in particles of different fineness. This get from the blades 7 in the direction of rotation of the rotor 6 web-shaped on the surface of the sieve 5. While the Particles in an air cushion with low friction in the direction of rotation Moving the rotor 6 on the surface of the sieve 5 takes place under Exposure to centrifugal force and airflow Separation into a coarse and a fine fraction. Particles, that pass through the openings of the sieve 5 leave the Impact mill through an outlet 3, while coarser particles due to further movement in a lateral channel 14 and from there to a second working area 13 of chamber 4. Under the influence of the same forces as in the work area 12, the particles are captured by the blades 9 and hurled against the blades 7. Because of the bump there is an additional comminution of the particles, which, leaving the blades 7, in the direction of rotation of the Move the rotor 6 again on the surface of the sieve 5. The Fine fraction is turned over again after passing the sieve 5 the outlet 3 discharged. The remaining coarse fraction can be fed through the channel 15 for further grinding become.

Die Anzahl der Überführungsstufen der Grobfraktionen vom Arbeitsbereich 12 in den Arbeitsbereich 13 hängt von der Art des Mahlgutes, seiner Feuchtigkeit und der Intensität der Prallung ab.The number of transfer stages of the coarse fractions from the work area 12 in the work area 13 depends on the art of the ground material, its moisture and the intensity of the Impact.

In einem Gehäuse 1 der Prallmühle sind horizontal und koaxial Rotoren 6 und 8 mit daran befestigten Schaufeln 7 und 9 angeordnet. An ihrem äusseren Umfang sind die Rotoren 6, 8 von einem Sieb 5 umgeben, wodurch eine zylindrische Kammer 4, die durch die Rotoren 6, 8 in zwei Arbeitsbereiche 12 und 13 unterteilt ist, gebildet ist.In a housing 1 of the impact mill are horizontal and coaxial Rotors 6 and 8 with blades 7 and 9 attached thereto. The rotors 6, 8 of surround a sieve 5, whereby a cylindrical chamber 4, the divided into two working areas 12 and 13 by the rotors 6, 8 is, is formed.

Der Antrieb der Rotoren 6, 8 erfolgt durch Elektromotoren 10 und 11.The rotors 6, 8 are driven by electric motors 10 and 11.

Der Rotor 6 hat zwei Reihen und der Rotor 8 eine Reihe Schaufeln 7, 9, die mit der Rotorscheibe in zwei Hälften geteilt ist. Eine Hälfte der Schaufeln 9 des Rotors 8 ist zwischen den Schaufelreihen des Rotors 6 angeordnet.The rotor 6 has two rows and the rotor 8 has a row of blades 7, 9 divided with the rotor disk in half is. One half of the blades 9 of the rotor 8 is between arranged the rows of blades of the rotor 6.

Ein Einlass 2, der seitlich am Arbeitsbereich 12 am Gehäuse 1 angeordnet ist, dient der Speisung der Prallmühle mit Mahlgut. Unterhalb der Kammer 4 ist ein Auslass 3 für das vermahlene Gut (Fertigprodukt) angeordnet.An inlet 2, which is located on the side of the working area 12 on the housing 1 is arranged, is used to feed the impact mill with regrind. Below the chamber 4 is an outlet 3 for the ground Well arranged (finished product).

In Fortsetzung des Siebes 5 sind Kanäle 14 und 15 am Gehäuse 1 angeordnet zur Rückführung der ungenügend zerkleinerten (groben) Teilchenfraktionen. Die Kanäle 14, 15 sind ausserhalb der Kammer 4 angeordnet. In seiner Breite entspricht der Kanal 14 der Breite der Reihe der Schaufeln 7 des Rotors 6, die näher zur Achse 16 angeordnet ist. Der Kanal 14 hat eine gekrümmte, kurvenartige Form, ausgehend von der Kammer 4 und seitlich und zentral in den Arbeitsbereich 13 mündend. Analog ist der Kanal 15 konzipiert. Er geht ebenfalls von der Kammer 4 aus und mündet seitlich und zentral in den Arbeitsbereich 12.Continuing with sieve 5, channels 14 and 15 are on the housing 1 arranged to return the insufficiently shredded (coarse) particle fractions. The channels 14, 15 are outside the chamber 4 arranged. The width corresponds to that Channel 14 of the width of the row of blades 7 of the rotor 6, which is arranged closer to axis 16. Channel 14 has one curved, curvilinear shape, starting from chamber 4 and laterally and centrally opening into work area 13. Analogous Channel 15 is designed. He also leaves the chamber 4 and flows out laterally and centrally into the work area 12th

Die Grösse des Spaltes zwischen den Enden der Schaufeln 7 und dem Sieb 5 ist so zu bemessen, dass die Bewegung des zerkleinerten Produktes auf dem Sieb 5 unter Einwirkung der Zentrifugalkraft ohne unmittelbare Einwirkung der äusseren Schaufeln 7 erfolgt.The size of the gap between the ends of the blades 7 and the sieve 5 is dimensioned so that the movement of the shredded Product on the screen 5 under the action of centrifugal force without direct influence from the outside Buckets 7 takes place.

Der Anstellwinkel der Schaufeln 7, 9 ist entsprechend klein zu wählen, um die beschriebene, verschleissmindernde Bewegungsbahn der Teilchen zu erreichen. The angle of attack of the blades 7, 9 is correspondingly small to choose the described, wear-reducing movement path of the particles.

Die Elektromotoren 10, 11 sind etwa gleich belastet.The electric motors 10, 11 are loaded approximately the same.

Der perforierte Teil der Kammer 4 ist demontierbar, um einen Siebwechsel zu ermöglichen.The perforated part of the chamber 4 is removable to one To allow screen changes.

Ebenfalls sollte der perforierte Teil der Kammer 4 einen möglichst grossen Teil ihrer zylindrischen Oberfläche einnehmen, um einen leistungsfähigen Trennprozess zu erreichen.The perforated part of the chamber 4 should also be as possible take up a large part of their cylindrical surface, to achieve an efficient separation process.

Durch Vergrösserung der Anzahl der Reihen an Schaufeln 7, 9 auf den Rotoren 6, 8 kann die Zahl der Vermahlungsstufen erhöht werden, z. B. auf sieben Stufen, wobei der Rotor 6 dann drei und der Rotor 8 zwei Reihen Schaufeln 7, 9 aufweist.By increasing the number of rows of blades 7, 9 on the rotors 6, 8 the number of grinding stages can be increased be, e.g. B. on seven stages, the rotor 6 then three and the rotor 8 has two rows of blades 7, 9.

Der im Vergleich zu herkömmlichen Schlagmühlen wesentlich geringere Energiebedarf und die geringe Reibungsbeeinflussung führen zu einer vernachlässigbaren Erwärmung der erfindungsgemässen Schlagmühle im Betrieb und damit auch zu einem geringen Feuchteverlust des Mahlgutes.The much smaller one compared to conventional impact mills Energy consumption and the low friction influence lead to negligible heating of the inventive Impact grinder in operation and thus to a low one Loss of moisture in the regrind.

Infolge des Betriebes der erfindungsgemässen Prallmühle ohne Aspiration ist es auch möglich, Gerste wirtschaftlich zu vermahlen.As a result of the operation of the impact mill according to the invention without Aspiration also makes it possible to grind barley economically.

Bei der Getreidevermahlung zu Mehl ist der Einsatz der Prallmühle als B1- und B2-Passage möglich.The impact mill is used for grinding grain into flour possible as B1 and B2 passage.

Claims (9)

  1. Process for the impact milling of, in particular, granular mill material using a mill with horizontally mounted rotors which run in opposite directions to one another and with arrangement of a centrifugal duct known per se for returning size-reduced mill material after a first milling stage to a subsequent milling stage, wherein the mill material is initially conveyed into a chamber (4) by the rotors of an impact mill, characterised in that
    a) the mill material is accelerated by blades (7) of a first rotor (6) and impacts against blades (9) of a rotor (8) rotating in the opposite direction and is size-reduced,
    b) the size-reduced mill material impinges on a sieve (5) at a small angle in the direction of movement of the rotor (6) and is separated into fractions,
    c) the remaining coarse fraction is relayed in the direction of movement and is subjected to renewed acceleration, impacting and sieving, the milling stages according to a) and c) being carried out in mutually separated working regions (12, 13) of the chamber (4).
  2. Process according to claim 1, characterised in that the relaying of the coarse fraction according to c) takes place in a duct (14, 15).
  3. Process according to claim 1, characterised in that acceleration and impacting alternate cyclically in two intermediate zones which are connected to one another by streams of inadequately size-reduced mill material, with separation of a fine fraction between the stages of milling, impacting in the intermediate stages taking place with different intensity.
  4. Impact mill for carrying out the process according to claim 1, characterised in that the impact mill consists of a housing (1) with rotors (6, 8) which are arranged horizontally and coaxially therein and on which blades (7, 9) are fastened, one rotor (6) having at least two rows of blades (7) and the other rotor (8) at least one row of blades (9) which is arranged between the rows of blades (7), and of a sieve (5) which surrounds the rotors (6, 8) at their outer periphery and an inlet (2) arranged laterally on the chamber (4) and an outlet (3) arranged below the chamber (4) and also of ducts (14, 15) forming an extension of the sieve (5).
  5. Impact mill according to claim 4, characterised in that the rows of blades (7, 9) are halved by the rotor disc and thus form separate working regions (12, 13).
  6. Impact mill according to claim 4, characterised in that the ducts (14, 15) are arranged outside the chamber (4) and open in a curve-like shape originating from the chamber (4) laterally into the working regions (13, 12), the width of the duct (14) corresponding to the width of the inner row of blades (7).
  7. Impact mill according to claim 4, characterised in that the sieve (5) is exchangeable.
  8. Impact mill according to claim 4, characterised in that the rotors (6, 8) are driven so as to rotate in opposite directions, preferably by separate drives.
  9. Impact mill according to claim 4, characterised in that the blades (7, 9) have a setting angle preferably of not more than 15°.
EP95108931A 1994-07-14 1995-06-09 Process for impactmilling and impactmill Expired - Lifetime EP0692309B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH224794 1994-07-14
CH224794 1994-07-14
CH2247/94 1994-07-14

Publications (2)

Publication Number Publication Date
EP0692309A1 EP0692309A1 (en) 1996-01-17
EP0692309B1 true EP0692309B1 (en) 1999-09-08

Family

ID=4229311

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Application Number Title Priority Date Filing Date
EP95108931A Expired - Lifetime EP0692309B1 (en) 1994-07-14 1995-06-09 Process for impactmilling and impactmill

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EP (1) EP0692309B1 (en)
DE (1) DE59506766D1 (en)
ES (1) ES2138113T3 (en)
RU (1) RU2153935C2 (en)
UA (1) UA44235C2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH690709A5 (en) * 1995-09-25 2000-12-29 Buehler Ag Process for Impact grinding and impact crusher.
RU2563695C1 (en) * 2014-07-08 2015-09-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Белгородский государственный технологический университет им. В.Г. Шухова" Disintegrator
RU2563693C1 (en) * 2014-07-08 2015-09-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Белгородский государственный технологический университет им. В.Г. Шухова" Disintegrator
RU2579491C1 (en) * 2015-02-16 2016-04-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Белгородский государственный технологический университет им. В.Г. Шухова" Disintegrator
RU183474U1 (en) * 2017-03-20 2018-09-24 федеральное государственное бюджетное образовательное учреждение высшего образования "Белгородский государственный технологический университет им. В.Г. Шухова" CENTRIFUGAL MILL

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Publication number Priority date Publication date Assignee Title
GB135955A (en) * 1918-12-06 1919-12-08 William Stephenson Barron Improvements relating to Impact Grinders.
GB191977A (en) * 1922-02-27 1923-01-25 George Porteus Improvements in or relating to disintegrators
DE699100C (en) 1939-10-25 1940-11-22 Adolf Steinbrueckner Hammer mill
FR1189754A (en) * 1958-01-14 1959-10-06 Crusher
FR2084599A5 (en) * 1970-03-13 1971-12-17 Estkolkhozproekt
DE3034849A1 (en) 1980-09-16 1982-04-29 Kasa-Forschungs- und Entwicklungs-Gesellschaft mbH & Co KG für Verfahrenstechnik, 6000 Frankfurt DISINTEREGRATOR AND METHOD FOR OPERATING THE DISINTEREGRATOR
NZ198677A (en) 1980-11-01 1985-11-08 Sardon Int Ltd Pulveriser with classifier
SU1258478A1 (en) * 1983-12-28 1986-09-23 Таллинский Политехнический Институт Apparatus for mincing
DE3417556A1 (en) 1984-05-11 1985-11-21 AGEFA Aktiengesellschaft für Aufbereitungstechnologie, Zunzgen Disintegrator
CH669337A5 (en) 1986-03-24 1989-03-15 Buehler Ag Geb

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DE59506766D1 (en) 1999-10-14
ES2138113T3 (en) 2000-01-01
EP0692309A1 (en) 1996-01-17
UA44235C2 (en) 2002-02-15
RU2153935C2 (en) 2000-08-10

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