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EP0226900A2 - Broyeur à plusieurs étages - Google Patents

Broyeur à plusieurs étages Download PDF

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Publication number
EP0226900A2
EP0226900A2 EP86116844A EP86116844A EP0226900A2 EP 0226900 A2 EP0226900 A2 EP 0226900A2 EP 86116844 A EP86116844 A EP 86116844A EP 86116844 A EP86116844 A EP 86116844A EP 0226900 A2 EP0226900 A2 EP 0226900A2
Authority
EP
European Patent Office
Prior art keywords
grinding
mill
stages
mill according
gas
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
EP86116844A
Other languages
German (de)
English (en)
Other versions
EP0226900A3 (en
EP0226900B1 (fr
Inventor
Günter Jäckering
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Altenburger Maschinen Jaeckering GmbH
Original Assignee
Altenburger Maschinen Jaeckering GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Altenburger Maschinen Jaeckering GmbH filed Critical Altenburger Maschinen Jaeckering GmbH
Priority to AT86116844T priority Critical patent/ATE65191T1/de
Publication of EP0226900A2 publication Critical patent/EP0226900A2/fr
Publication of EP0226900A3 publication Critical patent/EP0226900A3/de
Application granted granted Critical
Publication of EP0226900B1 publication Critical patent/EP0226900B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • 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
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/28—Passing gas through crushing or disintegrating zone gas moving means being integral with, or attached to, crushing or disintegrating element
    • 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
    • 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
    • B02C13/288—Ventilating, or influencing air circulation
    • 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
    • B02C13/30—Driving mechanisms
    • 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 a mill with several grinding stages, consisting of an essentially cylindrical stator common to all grinding stages, a rotor equipped with a plurality of grinding plates arranged one above the other in several stages, and a conveying device for a carrier gas which passes through the mill with the grinding stock .
  • a mill of this type is known from the publication "Ultra-Rotor” from the company “Altenburger Maschinen".
  • the crushing principle of this mill which works with air as the carrier gas, is based on the fact that the regrind particles within the large number of air vortices generated by the grinding plates are accelerated to a high speed and preferably execute mutual impacts. These mutual impacts break the particles apart. Only a small part of the shredding processes occurs when the regrind particles meet the stationary or rotating machine parts. Because the mutual collisions of the particles in the air flow predominate, * a particularly gentle, very fine reduction of the ground material is achieved.
  • the present invention has for its object to provide a mill of the type mentioned, in which an adequate air supply is always ensured. In addition, the grinding performance should be improved.
  • this object is achieved in that the grinding stages are preceded by a (further) gas delivery device.
  • this gas delivery device is located upstream of the grinding stages, operating conditions with insufficient air supply and the overheating caused thereby no longer occur.
  • the gas delivery device has a central gas and regrind inlet and a radial gas and regrind outlet.
  • the particular advantage of this solution is that the regrind is evenly distributed over the circumference of the mill before entering the actual grinding stages.
  • the gas delivery device according to the invention is designed as a single-stage radial fan and if the impeller with the grinding stages is fastened to the rotor shaft, specifically immediately below the first grinding stage.
  • Centrifugal fans of this type are characterized by a particularly high performance.
  • a radial fan wheel is also suitable for conveying the regrind from the axially close inlet to the radial outlet and thereby distributing it evenly over the circumference of the mill, i.e. immediately before entering the first grinding stage.
  • stator or the stator housing is denoted by 1, the rotor generally by 2, the feed hopper by 3 and the feed screw by 4.
  • the mill is equipped with five superimposed grinding stages 5.
  • Each grinding stage is formed by a plurality of grinding plates 7 fastened on the circumference of a circular disc 6 (e.g. about 50).
  • the grinding plates 7 each extend radially and parallel to the axis of rotation 8 of the rotor.
  • the discs 6 carrying the grinding plates 7 are fastened to the hub sections 9, which in turn are connected to the shaft 11 of the rotor 2.
  • the shaft 11 is supported above and below the rotor 2 in bearings 12, 13.
  • the drive (not shown) is located below the lower bearing 12.
  • the radial impeller 15 is additionally fastened, specifically immediately below the lowest grinding stage 5. Its axial inlet 16 is directed downward and faces a space 17 into which the feed shaft for the ground material with the screw 4 and an air supply duct 18 open . For better guidance of the ground material and the air when it enters the impeller 15 is the one occurs 16 surrounding edge 19 is provided, which extends perpendicular to the plane of the wheel 15 in the direction of the central space 17.
  • a disk 21 is attached to the shaft 11, on the circumference of which the classifier fingers 22 are attached.
  • the classifier fingers 22 there is an essentially circular outlet opening 23, to which the ring channel 24 and the outlet opening 25 connect.
  • the outlet opening 25 is connected either directly or via a separator, not shown, to the fan 26, the motor of which is designated 27.
  • the impeller 15 is shown again. It has a total of eight blades 28 curved to the rear.
  • the ground material and the amount of air required for both transport and grinding enter the space 17 and from there enter the fan wheel 15 axially and centrally.
  • the regrind and the air are set in rotation and conveyed radially outwards. This results in a uniform distribution of the ground material on the inner wall of the stator, which is followed by an equally uniform ascent of the ground material through the grinding stages 5.
  • the impeller 15 has a dissolving effect, that is, given if existing lumps of ground material are broken up.
  • the product and air then pass through the grinding stages 5.
  • Sufficiently finely ground material is able to pass through the rotating classifier fin with the carrier air.
  • the regrind-air mixture leave the mill 1 and are then separated from one another in the separators (not shown). Grist held back by the classifier fingers leaves the mill through the overflow flap 29 and is returned to the grist inlet.
  • the impeller 15 and the fan 26 effect the conveyance of the carrier gas and thus the conveyance of the ground material.
  • the delivery rate of the fan 15 corresponds to the speed of the rotor 2, so it does not change when the rotor speed is constant. If, according to an advantageous development of the invention, the speed of the motor 27 and thus the power of the fan 26 can be regulated, then the residence time of the product in the area of the grinding stages 5 can be influenced. Also the adaptation of the carrier gas flow conditions required for the transport of a product, which is dependent on many properties of the product to be ground, e.g. depend on its specific weight, is particularly simple with the help of the controllable fan 26.
  • the upper fan 26 is on a high delivery rate to ensure that the heavy product is conveyed safely.
  • the product is moist and the moisture is to be evaporated during the grinding process, it is expedient to throttle the upper fan 26. This increases the residence time of the air-material mixture in the mill, so that the desired drying occurs during the grinding.
  • the drying capacity can be increased further by supplying hot air to the mill 1 via the channel 18.
  • the upper fan must be throttled so that the desired grinding effect can be achieved better.
  • the finger sifter located above the rotor 2 to be equipped with its own drive so that the speed of the finger sifter can be set independently of the speed of the rotor 2.
  • This measure not only enables the grain size of the product to be influenced; it also allows the grinding process to be adapted to the product properties. If, for example, a specifically light product is to be ground particularly finely and particularly gently, then a strong carrier gas flow and particularly high speed of the finger sifter are to be used.
  • the strong carrier gas flow keeps the temperature of the ground material low.
  • the fast rotating finger classifier therefore does not let the product come out of the mill. It is returned to the mill entrance. During this time, it is subject to a break from grinding, so that it cools down further before it is subjected to the grinding process again.
  • FIG. 3 shows an embodiment for a separate finger classifier drive.
  • a sleeve 31 is assigned to the upper end of the shaft 11 of the mill 1, which is only shown in part, which is rotatably supported on the shaft 11 via the bearings 32, 33. Outside the sleeve 31, another bearing 34 is featured see through which the sleeve 31 is supported in the mill housing. The sleeve 31 is thereby rotatably supported independently of the rotating shaft 11.
  • the lower end of the sleeve 31 protrudes into the mill housing and there carries the disk 21 with the classifier fingers 22. It passes through the wall of the mill housing and is sealed therein with sealing rings, which are not described in detail. Outside the mill, it protrudes so far that it can be coupled to a controllable drive motor 35 by means of belts 36.
  • the fingers 22 usually have a rod-like shape. As a result of their radial arrangement, the gap between the fingers increases in the radial direction. In order to achieve an approximately constant gap width in the radial direction, it is expedient within the scope of the invention to use classifier fingers, the width of which increases in the radial direction. Exemplary embodiments for this are shown in FIGS. 4 and 5. With classifier fingers of this type, an advantageous influence on the action of the classifier, e.g. an equalization of the classifying effect.
  • FIGS. 6 and 7 show a grinding plate 7 which is further developed in an advantageous manner. She points in the An incision 41 in the middle of its running side. Above and below this incision 41, the running sections 42 and 43 are bent in the opposite direction. Surprisingly, grinding plates of this type result in a considerable improvement in grinding performance. The vortices located in the grinding chambers, consisting of air and regrind, are broken by this measure, so that an improvement in the grinding effect occurs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Discharge Heating (AREA)
EP86116844A 1985-12-07 1986-12-03 Broyeur à plusieurs étages Expired - Lifetime EP0226900B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86116844T ATE65191T1 (de) 1985-12-07 1986-12-03 Muehle mit mehreren mahlstufen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3543370 1985-12-07
DE19853543370 DE3543370A1 (de) 1985-12-07 1985-12-07 Muehle mit mehreren mahlstufen

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP19890113826 Division EP0347948A3 (fr) 1985-12-07 1986-12-03 Broyeur à plusieurs étages
EP89113826.5 Division-Into 1989-07-27

Publications (3)

Publication Number Publication Date
EP0226900A2 true EP0226900A2 (fr) 1987-07-01
EP0226900A3 EP0226900A3 (en) 1988-06-22
EP0226900B1 EP0226900B1 (fr) 1991-07-17

Family

ID=6287950

Family Applications (2)

Application Number Title Priority Date Filing Date
EP86116844A Expired - Lifetime EP0226900B1 (fr) 1985-12-07 1986-12-03 Broyeur à plusieurs étages
EP19890113826 Withdrawn EP0347948A3 (fr) 1985-12-07 1986-12-03 Broyeur à plusieurs étages

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP19890113826 Withdrawn EP0347948A3 (fr) 1985-12-07 1986-12-03 Broyeur à plusieurs étages

Country Status (5)

Country Link
US (1) US4747550A (fr)
EP (2) EP0226900B1 (fr)
AT (1) ATE65191T1 (fr)
DE (2) DE3543370A1 (fr)
ES (1) ES2023804B3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997026994A1 (fr) * 1996-01-23 1997-07-31 Rudolf Engel Dispositif pour traiter des elements composites
EP0796660A1 (fr) * 1996-03-21 1997-09-24 Altenburger Maschinen Jäckering GmbH Procédé et dispositif pour la fabrication de poudres ultrafines
WO1998051413A1 (fr) * 1997-05-12 1998-11-19 Bayer Aktiengesellschaft Moulin a microtourbillon et procede pour le sechage et la desagglomeration de materiaux en poudre
WO1999061157A1 (fr) * 1998-05-27 1999-12-02 Altenburger Maschinen Jäckering GmbH Sechage-broyage de derives de cellulose, notamment de methylcellulose
DE102008049339A1 (de) 2008-09-29 2010-04-01 Pallmann Maschinenfabrik Gmbh & Co. Kg Vorrichtung zum Bearbeiten von Aufgabegut

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US5171402A (en) * 1990-02-28 1992-12-15 E. I. Du Pont De Nemours And Company Dispersible aramid pulp
DE4200827C2 (de) * 1992-01-15 1997-09-04 Jackering Altenburger Masch Verfahren und Vorrichtung zur Erfassung von Kunststoff oder Gummi aus einem Abfallgemisch
US5695130A (en) * 1992-07-01 1997-12-09 Csendes; Ernest Method and apparatus for the dry grinding of solids
DE4228114A1 (de) * 1992-08-25 1994-03-03 Jackering Altenburger Masch Verfahren und Einrichtung zur Herstellung von Weizenmehl
US5429783A (en) * 1994-04-19 1995-07-04 E. I. Du Pont De Nemours And Company Making fiberballs
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DE19506817A1 (de) * 1995-02-27 1996-08-29 Jackering Altenburger Masch Schleuderteller für eine Mühle
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997026994A1 (fr) * 1996-01-23 1997-07-31 Rudolf Engel Dispositif pour traiter des elements composites
US6065697A (en) * 1996-01-23 2000-05-23 Engel; Rudolf Apparatus for treating composite elements
EP0796660A1 (fr) * 1996-03-21 1997-09-24 Altenburger Maschinen Jäckering GmbH Procédé et dispositif pour la fabrication de poudres ultrafines
US5984212A (en) * 1996-03-21 1999-11-16 Altenburger Maschinen Jackering Gmbh Method and apparatus for production of extremely fine powder
WO1998051413A1 (fr) * 1997-05-12 1998-11-19 Bayer Aktiengesellschaft Moulin a microtourbillon et procede pour le sechage et la desagglomeration de materiaux en poudre
WO1999061157A1 (fr) * 1998-05-27 1999-12-02 Altenburger Maschinen Jäckering GmbH Sechage-broyage de derives de cellulose, notamment de methylcellulose
DE102008049339A1 (de) 2008-09-29 2010-04-01 Pallmann Maschinenfabrik Gmbh & Co. Kg Vorrichtung zum Bearbeiten von Aufgabegut
US8267341B2 (en) 2008-09-29 2012-09-18 Pallmann Maschinenfabrik Gmbh & Co. Kg Device for processing feedstock
DE102008049339B4 (de) 2008-09-29 2020-07-16 Pallmann Maschinenfabrik Gmbh & Co. Kg Vorrichtung zum Bearbeiten von Aufgabegut

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Publication number Publication date
US4747550A (en) 1988-05-31
DE3543370A1 (de) 1987-06-11
EP0347948A2 (fr) 1989-12-27
ATE65191T1 (de) 1991-08-15
EP0347948A3 (fr) 1990-12-19
DE3680305D1 (de) 1991-08-22
EP0226900A3 (en) 1988-06-22
ES2023804B3 (es) 1992-02-16
EP0226900B1 (fr) 1991-07-17

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