EP0273198A2 - Method and installation for the two-stage crushing of brittle material - Google Patents

Method and installation for the two-stage crushing of brittle material Download PDF

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Publication number
EP0273198A2
EP0273198A2 EP87117375A EP87117375A EP0273198A2 EP 0273198 A2 EP0273198 A2 EP 0273198A2 EP 87117375 A EP87117375 A EP 87117375A EP 87117375 A EP87117375 A EP 87117375A EP 0273198 A2 EP0273198 A2 EP 0273198A2
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Prior art keywords
mill
semolina
roller mill
amount
screening
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EP87117375A
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German (de)
French (fr)
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EP0273198A3 (en
EP0273198B1 (en
Inventor
Gotthardt Dipl.-Ing. Blasczyk
Norbert Dipl.-Ing. Patzelt
Heinz-Georg Dipl.-Ing. Mersmann
Hardy Dipl.-Ing. Kropf
Franz Josef Dipl.-Ing. Adrian
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ThyssenKrupp Industrial Solutions AG
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Krupp Polysius 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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/42—Driving mechanisms; Roller speed control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating

Definitions

  • the invention relates to a method (according to the preamble of claim 1) and a system (according to the preamble of claim 5) for the two-stage comminution of brittle regrind.
  • the invention has for its object to provide a method according to the preamble of claim 1 and a system according to the preamble of claim 5 so that in the overall system results in the highest possible energy savings and the lowest possible work requirements for the crushing of the ground material.
  • the system shown for the two-stage comminution of brittle ground material for example cement clinker, contains a roller mill 1 and a second mill 2 connected downstream of the roller mill 1, which is preferably designed as a ball mill.
  • the system also contains a classifier 3 for classifying the material discharged from the second mill 2.
  • a measuring device 4 is provided for determining the amount of semolina produced during the screening.
  • a control flap 6 provided with a motor 5, which serves to divide the amount of semolina produced during the screening into a partial flow fed to the roller mill 1 and a partial flow fed to the second mill 2.
  • the ground material to be comminuted is located in storage containers 7, 8, 9 (which, for example, are assigned to individual components). It is fed to the roller mill 1 via metering belt scales 10, 11, 12.
  • the roller mill 1 contains two rollers 13, 14, of which the roller 13 is designed as a fixed roller and the roller 14 as a loose roller.
  • the two rollers pressed against each other at high pressure are driven by electric motors 15, 16 via gears 17, 18.
  • Measuring devices 19 and 20 determine the electric drive power consumed by the electric motors 15 and 16, respectively. Furthermore, a device 21 is provided which is connected to the measuring devices 19, 20 and selects the higher of the two measured power values. In terms of control technology, the device 21 is connected to the motor 5 of the control flap 6.
  • the measuring device 4 which determines the total amount of semolina produced during the sifting, is connected to a controller 22 which receives a signal from a summing element 23 which corresponds to the amount of fresh material just supplied (sum of the amount of regrind withdrawn from the storage containers 7, 8 and 9) .
  • the controller 22 is connected to the drives of the dosing belt scales 10, 11 and 12 via a switching element 24.
  • the system also contains a device 25, which is likewise connected to the switching element 24, for monitoring the fill level of the second mill 2.
  • the regrind fed to the roller mill 1 is comminuted in the nip of the roller mill and, if the grain size is appropriate, is also comminuted individually.
  • the agglomerates resulting from the comminution of the material bed are dissolved in the second mill 2. If necessary, the ground material in the second mill 2 undergoes further comminution.
  • the material discharged from the mill 2 is sighted in the sifter 3.
  • a partial flow of the roller mill 1 and a further partial flow of the mill 2 are fed from the resulting amount of semolina via the control flap 6.
  • a first control loop which contains the measuring device 4 and the controller 22
  • the quantity of fresh material fed to the roller mill 1 via the metering belt scales 10, 11, 12 is regulated in dependence on the quantity of semolina resulting from the screening so that the sum of the quantity of fresh material and the quantity of semolina for Mill 2 remains constant (27 is a setpoint).
  • a second control loop which contains the measuring devices 19, 20 and the control flap 6, the amount of semolina obtained during the screening is divided between the partial flows fed to the roller mill 1 and the second mill 2 in such a way that the drive power consumed by the roller mill 1 remains constant.
  • the device 21 selects each the higher of the two power values determined by the measuring devices 19, 20 and uses it to control the motor 5 of the control flap 6 (26 is a target value).
  • the device 25 sends a signal to the switching element 24 and interrupts the above-described regulation of the amount of fresh material depending on the quantity of semolina until the fill level of the mill 2 has normalized again.
  • the roller mill 1 runs in normal operation with constant power and is operated at constant speed.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

Die Erfindung betrifft ein Verfahren sowie eine Anlage zur zweistufigen Zerkleinerung von sprö­dem Mahlgut unter Verwendung einer Walzenmühle (1) und einer ihr nachgeschalteten zweiten Mühle (2), wo­bei ein Teilstrom der bei der Sichtung anfallen­den Grieße zur Walzenmühle (1) und ein weiterer Teil­strom zur zweiten Mühle (2) zurückgeführt wird. Hier­bei hält ein erster Regelkreis die Summe von Frischgutmenge und Grießmenge konstant, während ein zweiter Regelkreis die Aufteilung der Grieß­menge auf die beiden Teilströme so vornimmt, daß die Antriebsleistung der Walzenmühle konstant bleibt. The invention relates to a method and a plant for the two-stage comminution of brittle regrind using a roller mill (1) and a second mill (2) connected downstream of it, a partial stream of the grains resulting from the screening to the roller mill (1) and a further partial stream second mill (2) is returned. Here, a first control loop keeps the sum of the quantity of fresh material and the amount of semolina constant, while a second control loop distributes the amount of the semolina over the two partial flows so that the drive power of the roller mill remains constant.

Description

Die Erfindung betrifft ein Verfahren (entsprechend dem Oberbegriff des Anspruches 1) sowie eine Anla­ge (gemäß dem Gattungsbegriff des Anspruches 5) zur zweistufigen Zerkleinerung von sprödem Mahl­gut.The invention relates to a method (according to the preamble of claim 1) and a system (according to the preamble of claim 5) for the two-stage comminution of brittle regrind.

Ein Verfahren sowie eine Anlage dieser Art sind Gegenstand der deutschen Patentanmeldung P 35 20 069.3. Bei dieser älteren Lösung wird der der Walzenmühle zugeführte Teilstrom der Grießmenge so bemessen, daß im Aufgabeschacht der Walzenmühle auch bei wechselnder Frischgut­menge ein nahezu konstanter Füllstand aufrecht­erhalten wird.A method and an installation of this type are the subject of German patent application P 35 20 069.3. In this older solution, the partial flow of the semolina quantity fed to the roller mill is dimensioned in such a way that an almost constant fill level is maintained in the feed shaft of the roller mill even when the quantity of fresh material changes.

Der Erfindung liegt die Aufgabe zugrunde, ein Ver­fahren entsprechend dem Oberbegriff des Anspruches 1 sowie eine Anlage gemäß dem Gattungsbegriff des Anspruches 5 so auszubilden, daß sich im Gesamt­system eine möglichst hohe Energieeinsparung bzw. ein möglichst geringer spezifischer Arbeitsbedarf für die Zerkleinerung des Mahlgutes ergibt.The invention has for its object to provide a method according to the preamble of claim 1 and a system according to the preamble of claim 5 so that in the overall system results in the highest possible energy savings and the lowest possible work requirements for the crushing of the ground material.

Diese Aufgabe wird erfindungsgemäß durch die kenn­zeichnenden Merkmale des Anspruches 1 bzw. Anspru­ches 5 gelöst.This object is achieved by the characterizing features of claim 1 and claim 5.

Zweckmäßige Ausgestaltungen der Erfindung sind Ge­ genstand der Unteransprüche.Appropriate embodiments of the invention are Ge subject of the subclaims.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung schematisch veranschaulicht.An embodiment of the invention is illustrated schematically in the drawing.

Die dargestellte Anlage zur zweistufigen Zerklei­nerung von sprödem Mahlgut, beispielsweise von Zementklinker, enthält eine Walzenmühle 1 und eine der Walzenmühle 1 nachgeschaltete zweite Mühle 2, die vorzugsweise als Kugelmühle ausgebildet ist.The system shown for the two-stage comminution of brittle ground material, for example cement clinker, contains a roller mill 1 and a second mill 2 connected downstream of the roller mill 1, which is preferably designed as a ball mill.

Die Anlage enthält ferner einen Sichter 3 zur Sichtung des aus der zweiten Mühle 2 ausgetra­genen Gutes.The system also contains a classifier 3 for classifying the material discharged from the second mill 2.

Weiterhin ist eine Meßeinrichtung 4 zur Ermitt­lung der bei der Sichtung anfallenden Grießmenge vorgesehen. An diese Meßeinrichtung 4 schließt sich eine mit einem Motor 5 versehene Stellklappe 6 an, die dazu dient, die bei der Sichtung ange­fallene Grießmenge in einen der Walzenmühle 1 zu­geführten Teilstrom und einen der zweiten Mühle 2 zugeführten Teilstrom zu unterteilen.Furthermore, a measuring device 4 is provided for determining the amount of semolina produced during the screening. Connected to this measuring device 4 is a control flap 6 provided with a motor 5, which serves to divide the amount of semolina produced during the screening into a partial flow fed to the roller mill 1 and a partial flow fed to the second mill 2.

Das zu zerkleinernde Mahlgut befindet sich in Vorratsbehältern 7, 8, 9 (die beispielsweise einzelnen Komponenten zugeordnet sind). Es wird über Dosierbandwaagen 10, 11, 12 der Walzenmühle 1 zugeführt.The ground material to be comminuted is located in storage containers 7, 8, 9 (which, for example, are assigned to individual components). It is fed to the roller mill 1 via metering belt scales 10, 11, 12.

Die Walzenmühle 1 enthält zwei Walzen 13, 14, von denen die Walze 13 als Festwalze und die Walze 14 als Loswalze ausgebildet ist. Die beiden mit ho­hem Druck gegeneinandergepreßten Walzen werden durch Elektromotoren 15, 16 über Getriebe 17, 18 angetrieben.The roller mill 1 contains two rollers 13, 14, of which the roller 13 is designed as a fixed roller and the roller 14 as a loose roller. The two rollers pressed against each other at high pressure are driven by electric motors 15, 16 via gears 17, 18.

Meßeinrichtungen 19 bzw. 20 ermitteln die von den Elektromotoren 15 bzw. 16 aufgenommene elektrische Antriebsleistung. Weiterhin ist eine Einrichtung 21 vorgesehen, die mit den Meßeinrichtungen 19, 20 verbunden ist und jeweils den höheren der bei­den gemessenen Leistungswerte auswählt. Die Ein­richtung 21 ist steuerungstechnisch mit dem Motor 5 der Stellklappe 6 verbunden.Measuring devices 19 and 20 determine the electric drive power consumed by the electric motors 15 and 16, respectively. Furthermore, a device 21 is provided which is connected to the measuring devices 19, 20 and selects the higher of the two measured power values. In terms of control technology, the device 21 is connected to the motor 5 of the control flap 6.

Die Meßeinrichtung 4, die die bei der Sichtung anfallende gesamte Grießmenge ermittelt, ist mit einem Regler 22 verbunden, der von einem Summier­glied 23 ein Signal erhält, das der gerade zuge­führten Frischgutmenge (Summe der aus den Vorrats­behältern 7, 8 und 9 abgezogenen Mahlgutmenge) entspricht. Der Regler 22 ist über ein Umschalt­glied 24 mit den Antrieben der Dosierbandwaagen 10, 11 und 12 verbunden.The measuring device 4, which determines the total amount of semolina produced during the sifting, is connected to a controller 22 which receives a signal from a summing element 23 which corresponds to the amount of fresh material just supplied (sum of the amount of regrind withdrawn from the storage containers 7, 8 and 9) . The controller 22 is connected to the drives of the dosing belt scales 10, 11 and 12 via a switching element 24.

Schließlich enthält die Anlage noch eine gleich­falls mit dem Umschaltglied 24 verbundene Ein­richtung 25 zur Überwachung des Füllstandes der zweiten Mühle 2.Finally, the system also contains a device 25, which is likewise connected to the switching element 24, for monitoring the fill level of the second mill 2.

Die Funktion der Anlage ist wie folgt:The function of the system is as follows:

Das der Walzenmühle 1 zugeführte Mahlgut erfährt im Spalt der Walzenmühle eine Gutbettzerkleine­rung und bei entsprechender Korngröße zugleich eine Einzelkornzerkleinerung. Die bei der Gut­bettzerkleinerung anfallenden Agglomerate wer­den in der zweiten Mühle 2 aufgelöst. Gegebenen­falls erfährt das Mahlgut in der zweiten Mühle 2 eine weitere Zerkleinerung.The regrind fed to the roller mill 1 is comminuted in the nip of the roller mill and, if the grain size is appropriate, is also comminuted individually. The agglomerates resulting from the comminution of the material bed are dissolved in the second mill 2. If necessary, the ground material in the second mill 2 undergoes further comminution.

Das aus der Mühle 2 ausgetragene Gut wird im Sich­ter 3 gesichtet. Von der hierbei anfallenden Grießmenge wird über die Stellklappe 6 ein Teil­strom der Walzenmühle 1 und ein weiterer Teil­strom der Mühle 2 zugeführt.The material discharged from the mill 2 is sighted in the sifter 3. A partial flow of the roller mill 1 and a further partial flow of the mill 2 are fed from the resulting amount of semolina via the control flap 6.

Über einen ersten Regelkreis, der die Meßeinrich­tung 4 und den Regler 22 enthält, wird die der Walzenmühle 1 über die Dosierbandwaagen 10, 11, 12 zugeführte Frischgutmenge in Abhängigkeit von der bei der Sichtung anfallenden Grießmenge so geregelt, daß die Summe von Frischgutmenge und Grießmenge für Mühle 2 konstant bleibt (27 ist ein Sollwert).
Über einen zweiten Regelkreis, der die Meßeinrich­tungen 19, 20 und die Stellklappe 6 enthält, wird die bei der Sichtung anfallende Grießmenge auf die der Walzenmühle 1 und der zweiten Mühle 2 zu­geführten Teilströme derart aufgeteilt, daß die aufgenommene Antriebsleistung der Walzenmühle 1 konstant bleibt.Via a first control loop, which contains the measuring device 4 and the controller 22, the quantity of fresh material fed to the roller mill 1 via the metering belt scales 10, 11, 12 is regulated in dependence on the quantity of semolina resulting from the screening so that the sum of the quantity of fresh material and the quantity of semolina for Mill 2 remains constant (27 is a setpoint).
Via a second control loop, which contains the measuring devices 19, 20 and the control flap 6, the amount of semolina obtained during the screening is divided between the partial flows fed to the roller mill 1 and the second mill 2 in such a way that the drive power consumed by the roller mill 1 remains constant.

Zu diesem Zweck wählt die Einrichtung 21 jeweils den höheren der beiden von den Meßeinrichtungen 19, 20 ermittelten Leistungswerte aus und ver­wendet ihn zur Steuerung des Motors 5 der Stell­klappe 6 (26 ist ein Sollwert).For this purpose, the device 21 selects each the higher of the two power values determined by the measuring devices 19, 20 and uses it to control the motor 5 of the control flap 6 (26 is a target value).

Überschreitet der Füllstand der Mühle 2 einen Höchstwert, so gibt die Einrichtung 25 ein Sig­nal an das Umschaltglied 24 und unterbricht die oben erläuterte, in Abhängigkeit der Grießmenge erfolgende Regelung der Frischgutmenge so lange, bis sich der Füllstand der Mühle 2 wieder nor­malisiert hat.If the fill level of the mill 2 exceeds a maximum value, the device 25 sends a signal to the switching element 24 and interrupts the above-described regulation of the amount of fresh material depending on the quantity of semolina until the fill level of the mill 2 has normalized again.

Bei dem beschriebenen Verfahren läuft die Walzen­mühle 1 im Normalbetrieb mit konstanter Leistung und wird hierbei mit konstanter Drehzahl betrie­ben.In the method described, the roller mill 1 runs in normal operation with constant power and is operated at constant speed.

Claims (9)

1. Verfahren zur zweistufigen Zerkleinerung von sprödem Mahlgut, wobei a) das Mahlgut zunächst im Spalt einer Walzen­mühle (1) eine Gutbettzerkleinerung erfährt, b) die hierbei gebildeten Agglomerate an­schließend in einer der Walzenmühle (1) nachgeschalteten zweiten Mühle (2) aufge­löst und eventuell weiter zerkleinert wer­den, c) das aus der zweiten Mühle (2) ausgetragene Gut einer Sichtung unterworfen wird und von der hierbei anfallenden Grießmenge ein Teil­strom der Walzenmühle (1) und ein weiterer Teilstrom der zweiten Mühle (2) zugeführt wird, 1. Process for the two-stage comminution of brittle regrind, wherein a) the material to be ground is first comminuted in the nip of a roller mill (1), b) the agglomerates formed here are then dissolved in a second mill (2) connected downstream of the roller mill (1) and possibly further comminuted, c) the material discharged from the second mill (2) is subjected to a screening and a partial stream of the roller mill (1) and a further partial stream of the second mill (2) are fed from the resulting amount of semolina, gekennzeichnet durch folgende Merkmale: d) die der Walzenmühle (1) zugeführte Frisch­gutmenge wird in Abhängigkeit von der bei der Sichtung anfallenden Grießmenge so ge­regelt, daß die Summe von Frischgutmenge und Grießmenge für die zweite Mühle (2) kon­stant bleibt; e) die Aufteilung der bei der Sichtung anfal­lenden Grießmenge auf die der Walzenmühle (1) und der zweiten Muhle (2) zugeführten Teil­ströme wird in Abhängigkeit von der aufge­nommenen Antriebsleistung der Walzenmühle (1) so vorgenommen, daß die aufgenommene Antriebsleistung der Walzenmühle (1) kon­stant bleibt. characterized by the following features: d) the quantity of fresh material fed to the roller mill (1) is regulated as a function of the quantity of semolina resulting from the screening in such a way that the sum of quantity of fresh material and quantity of semolina remains constant for the second mill (2); e) the distribution of the amount of semolina obtained during the screening to that of the roller mill (1) and the second mill (2) supplied partial streams is carried out in dependence on the input drive power of the roller mill (1) so that the input drive power of the roller mill (1) remains constant. 2. Verfahren nach Anspruch 1 unter Verwendung einer Walzenmühle (1) mit je einem Antriebs­motor (15, 16) für beide Walzen (13, 14), da­durch gekennzeichnet, daß die von beiden An­triebsmotoren (15, 16) aufgenommene Leistung einzeln gemessen und zur Regelung der Auftei­lung der Grießmenge jeweils der höhere der bei­den gemessenen Leistungswerte verwendet wird.2. The method according to claim 1 using a roller mill (1), each with a drive motor (15, 16) for both rollers (13, 14), characterized in that the power consumed by both drive motors (15, 16) individually measured and for Regulation of the distribution of the amount of semolina the higher of the two measured power values is used. 3. Verfahren nach Anspruch 1, dadurch gekennzeich­net, daß der Füllstand der zweiten Mühle (2) überwacht und bei Überschreiten eines Höchst­wertes die in Abhängigkeit der Grießmenge er­folgende Regelung der Frischgutmenge so lange unterbrochen wird, bis sich der Füllstand der zweiten Mühle (2) wieder normalisiert hat.3. The method according to claim 1, characterized in that the fill level of the second mill (2) is monitored and, if a maximum value is exceeded, the regulation of the amount of fresh material which takes place as a function of the quantity of semolina is interrupted until the fill level of the second mill (2) is again normalized. 4. Verfahren nach Anspruch 1, dadurch gekennzeich­net, daß die Walzenmühle (1) mit konstanter Drehzahl betrieben wird.4. The method according to claim 1, characterized in that the roller mill (1) is operated at a constant speed. 5. Anlage zur zweistufigen Zerkleinerung von sprö­dem Mahlgut, enthaltend a) eine Walzenmühle (1), b) eine der Walzenmühle (1) nachgeschaltete zweite Mühle (2), c) einen Sichter (3) zur Sichtung des aus der zweiten Mühle (2) ausgetragenen Gutes, d) eine Einrichtung (5, 6) zur Aufteilung der bei der Sichtung anfallenden Grießmenge in einen der Walzenmühle (1) zugeführten Teil­strom und einen der zweiten Mühle (2) zuge­führten Teilstrom, 5. Plant for the two-stage comminution of brittle regrind containing a) a roller mill (1), b) a second mill (2) connected downstream of the roller mill (1), c) a classifier (3) for classifying the material discharged from the second mill (2), d) a device (5, 6) for dividing the quantity of semolina obtained during the screening into a partial flow fed to the roller mill (1) and a partial flow fed to the second mill (2), gekennzeichnet durch folgende weitere Anlagen­teile: e) einen ersten Regelkreis mit einer Meßein­richtung (4) zur Ermittlung der bei der Sichtung anfallenden Grießmenge sowie mit einem Regler (22), der die der Walzenmühle (1) zugeführte Frischgutmenge in Abhängig­keit von der bei der Sichtung anfallenden Grießmenge so regelt, daß die Summe von Frischgutmenge und Grießmenge konstant bleibt, f) eine zweiten Regelkreis, enthaltend eine die aufgenommene Antriebsleistung der Walzenmüh­le (1) ermittelnde Meßeinrichtung (19,20), die die Einrichtung (5, 6) zur Aufteilung der bei der Sichtung anfallenden Grießmenge derart steuert, daß die aufgenommene An­triebsleistung der Walzenmühle (1) konstant bleibt. characterized by the following additional system parts: e) a first control circuit with a measuring device (4) for determining the amount of semolina produced during the screening and with a controller (22) which controls the amount of fresh material supplied to the roller mill (1) as a function of the amount of semolina obtained during the screening so that the The sum of the quantity of fresh goods and the amount of semolina remains constant f) a second control circuit containing a measuring device (19, 20) which determines the drive power consumed by the roller mill (1) and which contains the device (5, 6) for dividing the quantity of semolina produced during the screening controls in such a way that the input drive power of the roller mill (1) remains constant. 6. Anlage nach Anspruch 5, enthaltend eine Walzen­mühle (1) mit je einem Antriebsmotor (15, 16) für beide Walzen (13, 14), dadurch gekennzeich­net, daß der zweite Regelkreis Meßeinrichtungen (19, 20) zur gesonderten Ermittlung der von den beiden Antriebsmotoren (15, 16) jeweils aufgenommenen Leistung sowie eine Einrichtung (21) zur Auswahl des jeweils höheren der bei­den Leistungswerte enthält.6. Plant according to claim 5, comprising a roller mill (1), each with a drive motor (15, 16) for both rollers (13, 14), characterized in that the second control loop measuring devices (19, 20) for the separate determination of the contains two drive motors (15, 16) each consumed power and a device (21) for selecting the respectively higher of the two power values. 7. Anlage nach Anspruch 5, gekennzeichnet durch a) eine Einrichtung (25) zur Überwachung des Füllstandes der zweiten Mühle (2), b) sowie ein Umschaltglied (24), das bei Über­schreiten eines Höchstwertes des Füllstan­des der zweiten Mühle (2) die in Abhängig­keit der Grießmenge erfolgende Regelung der Frischgutmenge so lange unterbricht, bis sich der Füllstand der zweiten Mühle (2) wieder normalisiert hat. 7. Plant according to claim 5, characterized by a) a device (25) for monitoring the fill level of the second mill (2), b) and a changeover element (24) which, when a maximum value of the fill level of the second mill (2) is exceeded, interrupts the regulation of the quantity of fresh material depending on the amount of semolina until the fill level of the second mill (2) has normalized again.
EP87117375A 1986-12-23 1987-11-25 Method and installation for the two-stage crushing of brittle material Expired - Lifetime EP0273198B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863644341 DE3644341A1 (en) 1986-12-23 1986-12-23 METHOD AND SYSTEM FOR THE TWO-STAGE CRUSHING OF SPROEDEM GROUND MATERIAL
DE3644341 1986-12-23

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EP0273198A2 true EP0273198A2 (en) 1988-07-06
EP0273198A3 EP0273198A3 (en) 1989-08-16
EP0273198B1 EP0273198B1 (en) 1991-02-06

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EP87117375A Expired - Lifetime EP0273198B1 (en) 1986-12-23 1987-11-25 Method and installation for the two-stage crushing of brittle material

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US (1) US4783011A (en)
EP (1) EP0273198B1 (en)
JP (1) JPS63166442A (en)
KR (1) KR880007128A (en)
BR (1) BR8707014A (en)
CA (1) CA1284976C (en)
DE (2) DE3644341A1 (en)
ES (1) ES2020252B3 (en)

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US9067213B2 (en) 2008-07-02 2015-06-30 Buhler Ag Method for producing flour and/or semolina

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3813661A1 (en) * 1988-04-22 1989-11-02 Krupp Polysius Ag MILLING PLANT
DE3822729A1 (en) * 1988-07-05 1990-01-11 Krupp Polysius Ag PLANT FOR SHREDDING SPROEDEM GROUND
DE3843338A1 (en) * 1988-12-22 1990-06-28 Krupp Polysius Ag SAFE
DE4005323A1 (en) * 1990-02-20 1991-08-22 Krupp Polysius Ag Crushing plant for cement material - involves first stage accepting pre-crushed material, and feeding to second stage with constant output regulation
JPH089016B2 (en) * 1991-05-14 1996-01-31 川崎重工業株式会社 Grinding device and grinding method by vertical roller mill
ES2064245B1 (en) * 1991-12-06 1997-10-16 Standart 90 MULTI-PURPOSE METHOD AND APPARATUS FOR GRINDING SOLID MATERIAL.
DE4140549A1 (en) * 1991-12-09 1993-06-17 Krupp Polysius Ag Roller mill for crushing hard brittle material - has main motor drive combined with hydraulic drive to give a wide speed range.
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US9067213B2 (en) 2008-07-02 2015-06-30 Buhler Ag Method for producing flour and/or semolina
US10981177B2 (en) 2008-07-02 2021-04-20 Bühler AG Apparatus and method for producing flour and/or semolina

Also Published As

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JPH0353020B2 (en) 1991-08-13
ES2020252B3 (en) 1991-08-01
EP0273198A3 (en) 1989-08-16
DE3767990D1 (en) 1991-03-14
CA1284976C (en) 1991-06-18
US4783011A (en) 1988-11-08
EP0273198B1 (en) 1991-02-06
DE3644341A1 (en) 1988-07-07
KR880007128A (en) 1988-08-26
BR8707014A (en) 1988-08-09
JPS63166442A (en) 1988-07-09

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