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EP0208947A2 - Method of and apparatus for comminuting grinding matter - Google Patents

Method of and apparatus for comminuting grinding matter Download PDF

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Publication number
EP0208947A2
EP0208947A2 EP86108468A EP86108468A EP0208947A2 EP 0208947 A2 EP0208947 A2 EP 0208947A2 EP 86108468 A EP86108468 A EP 86108468A EP 86108468 A EP86108468 A EP 86108468A EP 0208947 A2 EP0208947 A2 EP 0208947A2
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EP
European Patent Office
Prior art keywords
regrind
rollers
mass flow
roller
nip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
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EP86108468A
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German (de)
French (fr)
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EP0208947A3 (en
EP0208947B1 (en
Inventor
Heinrich Dipl.-Ing. Henne
Norbert Dipl.-Ing. Patzelt
Lutz Thomas Dipl.-Ing. Schneider
Osbert Richard Dipl.-Ing. Knobloch
Manfred Dipl.-Ing. Müller
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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
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • 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
    • B02C4/286—Feeding 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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/42—Driving mechanisms; Roller speed control

Definitions

  • the invention relates to a method and a system for comminuting regrind by means of two rollers pressed against one another at high pressure.
  • the fine and ultra-fine comminution of regrind with brittle material behavior in the gap between two rollers pressed against one another at high pressure is known, for example, from DE-B-27 08 053.
  • the regrind undergoes comminution in the roller gap. If the regrind is fed in with a grain size that is larger than the width of the roller gap, the material is first subjected to single-grain size reduction as it passes through the roller gap, and then immediately to size-size reduction.
  • the feed of the millbase to the roll nip has hitherto generally been effected solely by the action of gravity through a feed chute in which the millbase is at a certain level.
  • Another problem is to ensure over a wide range of throughput variations that the grinding effect and thus the product quality remains constant within narrow limits.
  • the invention is therefore based on the object of developing a method of the type required in the preamble of claim 1 in such a way that in the case of regrind of all types, in particular also in materials which tend to slip on the rollers, a perfect retraction of the regrind into the nip is ensured and with a throughput that changes over a wide range, a constant grinding effect (product granulation) is achieved regardless of the nature of the product.
  • the problems described above can also be avoided with materials that are to be fed in critically.
  • the forced feeding of the millbase according to the invention in a controllable mass flow creates the possibility of keeping the grinding action and thus the product quality constant over a wide variation range of the throughput, by changing the throughput with constant comminution effect, the roller circumferential speed proportional to the forcibly fed Mass flow changed while the grinding force is kept constant.
  • the process according to the invention is suitable for comminution of regrind of all kinds. It has particular advantages for comminution of regrind of high moisture, which is simultaneously mechanically dewatered and comminuted when it passes through the roll nip. In the case of forced feeding to the roll nip, for example via a screw, the regrind can already be subjected to pre-compression.
  • the system shown contains a material bed roller mill 1 with two rollers 2, 3, which are pressed against one another at high pressure.
  • the roller 2 is designed, for example, as a fixed roller, while the roller 3, which is movable in the horizontal direction, is pressed in the direction of the stationary roller 2 by an actuating device (for example a number of printing cylinders) which is not illustrated in detail.
  • one or more vertically arranged screws 4 are provided, which are driven by a motor 5 in a speed-controllable manner.
  • the two rollers 2, 3 are surrounded by a housing 6, which is closed at the bottom by a water collecting box 7.
  • This water collecting box 7 has an opening 8 in the middle, below the nip, for the exit of the strand 9 leaving the nip downwards.
  • the opening 8 is limited by slidable cutting 10.
  • wiper strips 11, 12, 13 are also provided on the end faces and on the circumferential sides of the rollers 2, 3.
  • a conveying member 14 which is designed as a rotating sieve and is permeable to liquid and which receives the strand strand 9.
  • a water collecting trough 15 which is inclined to one side (perpendicular to the plane of the drawing in FIG. 1).
  • the regrind (arrow 17) reaches the screw 4 via a chute 16 and is forcibly fed to the roller gap by the screw 4 in a controllable mass flow.
  • the ground material already undergoes a certain amount of pre-compression.
  • the ground material When passing through the nip, the ground material is comminuted, it generally being first subjected to single-grain comminution and then (in the same pass) comminuted material bed. At the same time, the ground material is mechanically dewatered as it passes through the nip by expelling the water, the volume of which exceeds the residual pore content of the slugs, in the nip.
  • the regrind has a residual porosity of 20% and a consistency (dry) of 2.5 g / cm 3 , the volumetric residual water content is 20% and the water content based on mass is 9%.
  • the regrind can therefore be dewatered or dried in the nip to about 9% residual moisture.
  • the water is essentially displaced backwards and in the direction of the current.
  • the water that is pushed back increases the moisture of the incoming material.
  • the laterally emerging water or. Mud flows are separated from the strand 9 by the blades 10 arranged immediately below the nip in order to avoid rewetting.
  • the water adhering to the rollers 2, 3 is removed by the scraper strips 11, 12, 13 and discharged from the water collecting box 7 together with the water discharged via the cutting edges 10 (arrow 18).
  • the conveying member 14 which is designed as a sieve, serves to drain liquid which is located on the outside of the strand 9.
  • the screw 4 serves the purpose of forcibly feeding regrind that would slip through the roller gap at a high roller speed or would only be poorly fed into the roller gap and thus enable high throughput even with such material (for example very moist coal) in the first place. Furthermore, however, the screw 4 serves the special purpose of ensuring, over a wide variation range of the throughput, that the grinding action and thus the product quality remains constant within narrow limits.
  • a device (not illustrated) which, when the throughput is changed, simultaneously changes the rotational speed of the roller mill and the rotational speed of the screw in such a way that the peripheral speed of the rollers changes in proportion to the mass flow force-fed by the screw. If the grinding force is kept constant at the same time (i.e. the force with which the movable roller 3 is pressed in the direction of the fixedly arranged roller 2), the bowl thickness and the comminution conditions and thus also the product quality remain constant.
  • the speed of the screw 4 is changed so that the mass flow forced by the screw changes in proportion to the peripheral speed u of the rollers.
  • the specific throughput A thus remains constant, as follows from - (2). However, the shoulder thickness s remains unchanged, cf. (3).
  • the ratio of grinding force / specific throughput is a parameter to be kept constant for the respective regrind, which is a measure of the energy requirement for the desired degree of comminution.
  • the combined regulation of screw and roller speed thus ensures that the product properties can be kept constant and controllable, even if the properties of the millbase, such as the grain size, hardness, grindability, composition, moisture etc. change.

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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 Zerkleinerung von Mahlgut mittels einer Gutbett-Walzenmühle, wobei das Mahlgut dem Walzenspalt in einem regelbaren Massenstrom zwangsweise, beispielsweise durch eine Schnecke, zugeführt wird.. Dadurch lassen sich auch Materialien einwandfrei zerkleinern, die zum Durchrutschen auf den Walzen neigen. Es besteht ferner die Möglichkeit, die Produktbeschaffenheit über einen weiten Variationsbereich des Durchsatzes konstant zu halten.The invention relates to a method and a system for comminuting regrind by means of a material bed roller mill, the regrind being forcibly fed to the nip in a controllable mass flow, for example by means of a screw. This also enables materials which are ready to be slipped to be comminuted without problems tilt the reels. There is also the possibility of keeping the product quality constant over a wide range of throughput variations.

Description

Die Erfindung betrifft ein Verfahren sowie eine Anlage zur Zerkleinerung von Mahlgut mittels zweier mit hohem Druck gegeneinander gepreßter Walzen.The invention relates to a method and a system for comminuting regrind by means of two rollers pressed against one another at high pressure.

Die Fein-und Feinstzerkleinerung von Mahlgut mit sprödem Stoffverhalten im Spalt zweier mit hohem Druck gegeneinander gepreßter Walzen ist beispielsweise durch die DE-B-27 08 053 bekannt. Das Mahlgut erfährt dabei im Walzenspalt eine Gutbettzerkleinerung. Wird das Mahlgut mit einer Korngröße aufgegeben, die größer als die Weite des Walzenspaltes ist, so erfährt das Gut bei dem Durchtritt durch den Walzenspalt zunächst eine Einzelkornzerkleinerung und unmittelbar anschließend eine Gutbettzerkleinerung.The fine and ultra-fine comminution of regrind with brittle material behavior in the gap between two rollers pressed against one another at high pressure is known, for example, from DE-B-27 08 053. The regrind undergoes comminution in the roller gap. If the regrind is fed in with a grain size that is larger than the width of the roller gap, the material is first subjected to single-grain size reduction as it passes through the roller gap, and then immediately to size-size reduction.

Die Zufuhr des Mahlgutes zum Walzenspalt erfolgt bisher im allgemeinen durch reine Schwerkraftwirkung über einen Aufgabeschacht, in dem das Mahlgut mit einem gewissen Füllstand steht.The feed of the millbase to the roll nip has hitherto generally been effected solely by the action of gravity through a feed chute in which the millbase is at a certain level.

Es hat sich nun jedoch herausgestellt, daß bestimmte Materialien zum Durchrutschen auf den Walzen neigen bzw. nicht einwandfrei in den Walzenspalt eingezogen werden. Derartige Schwierigkeiten treten beispielsweise bei Kohle mit zuneh-- mender Feuchte auf.However, it has now been found that certain materials tend to slip on the rollers or are not correctly drawn into the nip. Such difficulties occur, for example, with coal with increasing moisture.

Ein weiteres Problem besteht darin, über einen weiten Variationsbereich des Durchsatzes sicherzustellen, daß die Mahlwirkung und damit die Produktbeschaffenheit in engen Grenzen konstant bleibt.Another problem is to ensure over a wide range of throughput variations that the grinding effect and thus the product quality remains constant within narrow limits.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der im Oberbegriff des Anspruches 1 vorausgesetzten Art so auszubilden, daß bei Mahlgut aller Art, insbesondere auch bei Materialien, die zum Durchrutschen auf den Walzen neigen, ein einwandfreies Einziehen des Mahlgutes in den Walzenspalt gewährleistet ist und bei einem sich über einen weiten Bereich ändernden Durchsatz unabhängig von der Produktbeschaffenheit eine konstante Mahlwirkung (Produktkörnung) erzielt wird.The invention is therefore based on the object of developing a method of the type required in the preamble of claim 1 in such a way that in the case of regrind of all types, in particular also in materials which tend to slip on the rollers, a perfect retraction of the regrind into the nip is ensured and with a throughput that changes over a wide range, a constant grinding effect (product granulation) is achieved regardless of the nature of the product.

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

Indem erfindungsgemäß das Mahlgut dem Walzenspalt in einem regelbaren Massenstrom zwangsweise zugeführt wird, lassen sich die oben geschilderten Probleme auch bei kritisch einzuziehenden Materialien vermeiden. Zugleich wird durch die erfindungsgemäße zwangsweise Zuführung des Mahlgutes in einem regelbaren Massenstrom die Möglichkeit geschaffen, die Mahlwirkung und damit die Produktbeschaffenheit über einen weiten Variationsbereich des Durchsatzes in engen Grenzen konstant zu halten, indem zur Änderung des Durchsatzes bei konstanter Zerkleinerungswirkung die Walzenumfangsgeschwindigkeit proportional zum zwangsweise zugeführten Massenstrom geändert und gleichzeitig die Mahlkraft konstant gehalten wird.By forcibly feeding the regrind to the nip in a controllable mass flow according to the invention, the problems described above can also be avoided with materials that are to be fed in critically. At the same time, the forced feeding of the millbase according to the invention in a controllable mass flow creates the possibility of keeping the grinding action and thus the product quality constant over a wide variation range of the throughput, by changing the throughput with constant comminution effect, the roller circumferential speed proportional to the forcibly fed Mass flow changed while the grinding force is kept constant.

Das erfindungsgemäße Verfahren eignet sich zur Zerkleinerung von Mahlgut aller Art. Es besitzt besondere Vorteile zur Zerkleinerung von Mahlgut hoher Feuchte, das beim Passieren des Walzenspaltes gleichzeitig mechanisch entwässert und zerkleinert wird. Bei der zwangsweisen Zuführung zum Walzenspalt, beispielsweise über eine Schnecke, kann das Mahlgut bereits einer Vorkompression unterworfen werden.The process according to the invention is suitable for comminution of regrind of all kinds. It has particular advantages for comminution of regrind of high moisture, which is simultaneously mechanically dewatered and comminuted when it passes through the roll nip. In the case of forced feeding to the roll nip, for example via a screw, the regrind can already be subjected to pre-compression.

Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche und werden im Zusammenhang mit der Erläuterung eines in der Zeichnung veranschaulichten Ausführungsbeispieles näher erläutert.Advantageous embodiments of the invention are the subject of the dependent claims and are explained in connection with the explanation of an exemplary embodiment illustrated in the drawing.

In der Zeichnung zeigen

  • Fig. 1 einen schematischen Querschnitt durch eine Gutbett -Walzenmühle mit vorgeschalteter Schnecke,
  • Fig. 2 einen Längsschnitt durch eine Walze längs der Linie 11-11 der Fig. 1.
Show in the drawing
  • 1 shows a schematic cross section through a material bed roller mill with an upstream screw,
  • 2 shows a longitudinal section through a roller along the line 11-11 of FIG. 1st

Die-dargestellte Anlage enthält eine Gutbett-Walzenmühle 1 mit zwei Walzen 2, 3, die mit hohem Druck gegeneinander gepreßt werden. Die Walze 2 ist beispielsweise als Festwalze ausgebildet, während die in horizontaler Richtung bewegliche Walze 3 durch eine nicht im einzelnen veranschaulichte Betätigungseinrichtung - (beispielsweise eine Anzahl von Druckzylindern) in Richtung auf die ortsfeste Walze 2 gedrückt wird.The system shown contains a material bed roller mill 1 with two rollers 2, 3, which are pressed against one another at high pressure. The roller 2 is designed, for example, as a fixed roller, while the roller 3, which is movable in the horizontal direction, is pressed in the direction of the stationary roller 2 by an actuating device (for example a number of printing cylinders) which is not illustrated in detail.

Zur zwangsweisen Zuführung eines regelbaren Massenstromes des Mahlgutes zum Walzenspalt sind eine oder mehrere vertikal angeordnete Schnecken 4 vorgesehen, die durch einen Motor 5 drehzahlregelbar angetrieben werden.For the compulsory feeding of a controllable mass flow of the ground material to the roll gap, one or more vertically arranged screws 4 are provided, which are driven by a motor 5 in a speed-controllable manner.

Die beiden Walzen 2, 3 sind von einem Gehäuse 6 umgeben, das nach unten durch einen Wasserauffangkasten 7 abgeschlossen wird. Dieser Wasserauffangkasten 7 weist in der Mitte, unterhalb des Walzenspaltes, eine Öffnung 8 zum Austritt des den Walzenspalt nach unten verlassenden Schülpenstranges 9 auf.The two rollers 2, 3 are surrounded by a housing 6, which is closed at the bottom by a water collecting box 7. This water collecting box 7 has an opening 8 in the middle, below the nip, for the exit of the strand 9 leaving the nip downwards.

Die Öffnung 8 wird durch verschiebbare Schneiden 10 begrenzt.The opening 8 is limited by slidable cutting 10.

Zum Abstreifen des an den Walzen 2, 3 anhaftenden Wassers sind ferner an den Stirnseiten und an den Umfangsseiten der Walzen 2, '3 Abstreiferleisten 11, 12, 13 vorgesehen.To wipe off the water adhering to the rollers 2, 3, wiper strips 11, 12, 13 are also provided on the end faces and on the circumferential sides of the rollers 2, 3.

Unterhalb der Gutbett-Walzenmühle 1 befindet sich ein als umlaufendes Sieb ausgebildetes, für Flüssigkeit durchlässiges Förderorgan 14, das den Schülpenstrang 9 aufnimmt. Unterhalb des oberen Trums des Förderorganes 14 ist eine Wasserauffangwanne 15 vorgesehen, die nach einer Seite - (senkrecht zur Zeichenebene der Fig. 1) geneigt ist.Beneath the material bed roller mill 1 there is a conveying member 14, which is designed as a rotating sieve and is permeable to liquid and which receives the strand strand 9. Below the upper run of the conveying member 14 there is a water collecting trough 15 which is inclined to one side (perpendicular to the plane of the drawing in FIG. 1).

Das Mahlgut (Pfeil 17) gelangt über eine Schurre 16 zur Schnecke 4 und wird durch die Schnecke 4 in einem regelbaren Massenstrom zwangsweise dem Walzenspalt zugeführt. Im Bereich der Schnecke 4 erfährt das Mahlgut bereits eine gewisse Vorkompression.The regrind (arrow 17) reaches the screw 4 via a chute 16 and is forcibly fed to the roller gap by the screw 4 in a controllable mass flow. In the area of the screw 4, the ground material already undergoes a certain amount of pre-compression.

Beim Passieren des Walzenspaltes wird das Mahlgut zerkleinert, wobei es im allgemeinen zunächst eine Einzelkornzerkleinerung und anschließend (im gleichen Durchlauf) eine Gutbettzerkleinerung erfährt. Gleichzeitig wird das Mahlgut beim Passieren des Walzenspaltes mechanisch entwässert, indem das Wasser, dessen Volumen über den Restporengehalt der Schülpen hinausgeht, im Walzenspalt ausgetrieben wird.When passing through the nip, the ground material is comminuted, it generally being first subjected to single-grain comminution and then (in the same pass) comminuted material bed. At the same time, the ground material is mechanically dewatered as it passes through the nip by expelling the water, the volume of which exceeds the residual pore content of the slugs, in the nip.

Besitzt das Mahlgut beispielsweise eine Restporosität von 20 % und eine Stoffdichte (trocken) von 2,5g/cm3, so ist der volumetrische Restwassergehalt 20 % und der auf Masse bezogene Wassergehalt 9 %. Das Mahlgut kann daher im Walzenspalt bis auf etwa 9 % Restfeuchte entwässert bzw. getrocknet werden.If, for example, the regrind has a residual porosity of 20% and a consistency (dry) of 2.5 g / cm 3 , the volumetric residual water content is 20% and the water content based on mass is 9%. The regrind can therefore be dewatered or dried in the nip to about 9% residual moisture.

Das Wasser wird hierbei im wesentlichen nach den Seiten und -in Stromrichtung gesehen -zurück verdrängt. Durch das zurückgedrängte Wasser wird die Feuchte des ankommenden Materiales angehoben. Es gibt dann einen quasi-stationären Zustand, in dem die "Feuchte-Anhebung" des ankommenden Materiales konstant bleibt und die seitlich austretenden Wasser-bzw. Schlammströme im Gleichgewicht mit der Differenz der Gutfeuchte vor und nach der Mühle sind.The water is essentially displaced backwards and in the direction of the current. The water that is pushed back increases the moisture of the incoming material. There is then a quasi-steady state in which the "moisture increase" of the incoming material remains constant and the water or water escaping laterally. Mud flows are in equilibrium with the difference in the moisture content before and after the mill.

Die seitlich austretenden Wasser-bzw. Schlammströme werden durch die unmittelbar unterhalb des Walzenspaltes angeordneten Schneiden 10 von dem Schülpenstrang 9 abgetrennt, um dessen Rückfeuchtung zu vermeiden. Das an den Walzen 2, 3 anhaftende Wasser wird durch die Abstreiferleisten 11, 12, 13 entfernt und zusammen mit dem über die Schneiden 10 abgeführten Wasser aus dem Wasserauffangkasten 7 abgeführt - (Pfeil 18).The laterally emerging water or. Mud flows are separated from the strand 9 by the blades 10 arranged immediately below the nip in order to avoid rewetting. The water adhering to the rollers 2, 3 is removed by the scraper strips 11, 12, 13 and discharged from the water collecting box 7 together with the water discharged via the cutting edges 10 (arrow 18).

Das als Sieb ausgebildete Förderorgan 14 dient dazu, Flüssigkeit, die sich außen am Schülpenstrang 9 befindet, abtropfen zu lassen.The conveying member 14, which is designed as a sieve, serves to drain liquid which is located on the outside of the strand 9.

Die Schnecke 4 dient zum einen dem Zweck, Mahlgut, das bei hoher Walzendrehzahl durchrutschen bzw. nur schlecht in den Walzenspalt eingezogen würde, zwangsweise dem Walzenspalt zuzuführen und damit einen hohen Durchsatz auch bei solchem Material (beispielsweise sehr feuchter Kohle) überhaupt erst zu ermöglichen. Weiterhin dient jedoch die Schnecke 4 dem besonderen Zweck, über einen weiten Variationsbereich des Durchsatzes sicherzustellen, daß die Mahlwirkung und damit die Produktbeschaffenheit in engen Grenzen konstant bleibt.On the one hand, the screw 4 serves the purpose of forcibly feeding regrind that would slip through the roller gap at a high roller speed or would only be poorly fed into the roller gap and thus enable high throughput even with such material (for example very moist coal) in the first place. Furthermore, however, the screw 4 serves the special purpose of ensuring, over a wide variation range of the throughput, that the grinding action and thus the product quality remains constant within narrow limits.

Zu diesem Zweck ist eine (nicht veranschaulichte) Einrichtung vorgesehen, die bei einer gewünschten Änderung des Durchsatzes die Drehzahl der Walzenmühle und die Drehzahl der Schnecke gleichzeitig derart ändert, daß sich die Umfangsgeschwindigkeit der Walzen proportional zu dem durch die Schnecke zwangsweise zugeführten Massenstrom ändert. Hält man gleichzeitig die Mahlkraft konstant (d.h. die-Kraft, mit der die bewegliche Walze 3 in Richtung auf die ortsfest angeordnete Walze 2 gedrückt wird), so bleiben die Schülpenstärke und die Zerkleinerungsbedingungen und damit auch die Produktbeschaffenheit konstant.For this purpose, a device (not illustrated) is provided which, when the throughput is changed, simultaneously changes the rotational speed of the roller mill and the rotational speed of the screw in such a way that the peripheral speed of the rollers changes in proportion to the mass flow force-fed by the screw. If the grinding force is kept constant at the same time (i.e. the force with which the movable roller 3 is pressed in the direction of the fixedly arranged roller 2), the bowl thickness and the comminution conditions and thus also the product quality remain constant.

Dies sei anhand nachstehender Formeln erläutert, in denen folgende Abkürzungen gelten:

  • M = Durchsatz (Massenstrom)
  • D = Walzendurchmesser
  • L = Walzenspaltlänge
  • u = Walzenumfangsgeschwindigkeit
  • s = Schülpenstärke (Walzenspaltbreite)
  • = Schülpendichte
  • in = spezifischer Durchsatz
This is explained using the following formulas, in which the following abbreviations apply:
  • M = throughput (mass flow)
  • D = roll diameter
  • L = nip length
  • u = roller circumferential speed
  • s = slug thickness (roll gap width)
  • = School density
  • in = specific throughput

Der Durchsatz (Massenstrom) A ergibt sich aus folgender Beziehung

Figure imgb0001
The throughput (mass flow) A results from the following relationship
Figure imgb0001

Definiert man den spezifischen Durchsatz A wie folgt

Figure imgb0002
so läßt sich aus (1) und (2) folgende Beziehung ableiten
Figure imgb0003
 Define the specific throughput A as follows
Figure imgb0002
 the following relationship can be derived from (1) and (2)
Figure imgb0003

Wird die Walzendrehzahl zur Anpassung des Mühlendurchsatzes an den jeweiligen Bedarf geändert, so wird erfindungsgemäß die Drehzahl der Schnecke 4 so geändert, daß sich der durch die Schnecke zwangsweise zugeführte Massenstrom proportional zur Umfangsgeschwindigkeit u der Walzen ändert. Damit bleibt der spezifische Durchsatz A konstant, wie aus - (2) folgt. Damit bleibt jedoch auch die Schülpenstärke s unverändert, vgl. (3).If the roller speed is changed to adapt the mill throughput to the respective requirement, then according to the invention the speed of the screw 4 is changed so that the mass flow forced by the screw changes in proportion to the peripheral speed u of the rollers. The specific throughput A thus remains constant, as follows from - (2). However, the shoulder thickness s remains unchanged, cf. (3).

Wird zugleich die mahlkraft konstant gehalten, so bleiben die Zerkleinerungsbedingungen im Walzen spalt und damit auch die Produktbeschaffenheit unverändert.If the grinding force is kept constant at the same time, the crushing conditions in the roll gap remain unchanged, and with it the product quality.

Zum Verständnis sei noch angemerkt, daß das Verhältnis Mahlkraft/spezifischer Durchsatz eine für das jeweilige Mahlgut konstant zu haltende Kenngröße ist, die ein maß für den Energiebedarf für den gewünschten Zerkleinerungsgrad ist.For the sake of understanding, it should also be noted that the ratio of grinding force / specific throughput is a parameter to be kept constant for the respective regrind, which is a measure of the energy requirement for the desired degree of comminution.

Die kombinierte Regelung von Schnecken-und Walzendrehzahl gewährleistet somit, daß die Produkteigenschaften konstant und regelbar gehalten werden können, auch wenn sich die Mahlguteigenschaften, wie Aufgabe-Korngröße, Härte, Mahlbarkeit, Zusammensetzung, Feuchte usw. ändern.The combined regulation of screw and roller speed thus ensures that the product properties can be kept constant and controllable, even if the properties of the millbase, such as the grain size, hardness, grindability, composition, moisture etc. change.

Claims (7)

1. Verfahren zur Zerkleinerung von Mahlgut mittels zweier mit hohem Druck gegeneinander gepreßter Walzen,
gekennzeichnet durch folgende Merkmale: a) das Mahlgut wird dem Walzenspalt in einem regelbaren Massenstrom (Ṁ) zwangsweise zugeführt; b) zur Änderung des Durchsatzes bei konstanter Zerkleinerungswirkung wird b,) die Walzenumfangsgeschwindigkeit (u) proportional zum zwangsweise zugeführten Massenstrom ( M ) geändert b2) und gleichzeitig die Mahlkraft konstant gehalten. 1. Process for comminuting regrind by means of two rollers pressed against one another at high pressure,
characterized by the following features: a) the regrind is forcibly fed into the roll gap in a controllable mass flow (Ṁ); b) to change the throughput with constant grinding effect b,) the roller circumferential speed (u) changed in proportion to the forced mass flow (M) b2) and at the same time the grinding force is kept constant. 2. Verfahren nach Anspruch 1, insbesondere zur gleichzeitigen Entwässerung und Zerkleinerung von Mahlgut hoher Feuchte, dadurch gekennzeichnet, daß das Mahlgut bei der zwangsweisen Zuführung zum Walzenspalt zugleich einer Vorkompression unterworfen wird.2. The method according to claim 1, in particular for the simultaneous dewatering and comminution of regrind of high humidity, characterized in that the regrind is simultaneously subjected to a pre-compression when it is forcibly fed to the roll gap. 3. Anlage zur Durchführung des Verfahrens nach Anspruch 1,
gekennzeichnet durch a) eine Gutbett-Walzenmühle (1), enthaltend zwei mit hohem Druck gegeneinander gepreßte Walzen (2, 3), b) eine vorzugsweise durch eine oder mehrere Schnecken (4) gebildete Einrichtung zur zwangsweisen Zuführung eines regelbaren Massenstromes ( A ) des Mahlgutes zum Walzenspalt. 3. Plant for performing the method according to claim 1,
marked by a) a material bed roller mill (1) containing two rollers (2, 3) pressed against one another at high pressure, b) a device, preferably formed by one or more screws (4), for the compulsory supply of a controllable mass flow (A) of the ground material to the roll gap. 4. Anlage nach Anspruch 3, gekennzeichnet durch c) eine Einrichtung zur gleichzeitigen Drehzahländerung der Gutbett-Walzenmühle (1) und der Schnecke (4) derart, daß sich die Umfangsgeschwindigkeit (u) der Walzen (2, 3) proportional zu dem durch die Schnecke (4) zwangsweise zugeführten Massenstrom ( A ) ändert, d) eine Einrichtung zur Konstanthaltung der Mahlkraft. 4. Plant according to claim 3, characterized by c) a device for simultaneous speed change of the material bed roller mill (1) and the screw (4) in such a way that the peripheral speed (u) of the rollers (2, 3) is proportional to the mass flow (A) forcibly fed by the screw (4) ) changes, d) a device for keeping the grinding force constant. 5. Anlage nach Anspruch 4 zur gleichzeitigen Entwässerung und Zerkleinerung von Mahlgut hoher Feuchte,
dadurch gekennzeichnet, daß unmittelbar unterhalb des Walzenspaltes vorzugsweise verstellbare Schneiden (10) zur Abtrennung der aus dem Mahlgut ausgepreßten Flüssigkeit von dem aus dem Walzenspalt als Schülpenstrang (9) austretenden zerkleinerten Mahlgut vorgesehen sind.5. Plant according to claim 4 for simultaneous dewatering and comminution of regrind of high humidity,
characterized in that immediately below the roller gap preferably adjustable blades (10) for separating the from the mill well-squeezed liquid are provided from the comminuted ground material emerging from the roll nip as a strand (9). 6. Anlage nach Anspruch 5, dadurch gekennzeichnet, daß an den Stirnseiten und an den Umfangsseiten der Walzen (2, 3) Abstreiferleisten (11, 12, 13) zur Abtrennung der von den Walzen (2, 3) mitgeführten, aus dem Mahlgut ausgepreßten Flüssigkeit vorgesehen sind.6. Plant according to claim 5, characterized in that on the end faces and on the circumferential sides of the rollers (2, 3) wiper strips (11, 12, 13) for separating the entrained from the rollers (2, 3), pressed out of the regrind Liquid are provided. 7. Anlage nach den Ansprüchen 5 und 6, dadurch gekennzeichnet, daß auf der Austrittsseite des Walzenspaltes ein für Flüssigkeit durchlässiges, vorzugsweise als umlaufendes Sieb ausgebildetes Förderorgan (14) für das zerkleinerte und entwässerte Mahlgut vorgesehen ist.7. Plant according to claims 5 and 6, characterized in that on the outlet side of the nip a liquid-permeable, preferably designed as a circulating sieve conveyor (14) is provided for the crushed and dewatered regrind.
EP86108468A 1985-07-19 1986-06-20 Method of and apparatus for comminuting grinding matter Expired EP0208947B1 (en)

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DE3525935 1985-07-19
DE19853525935 DE3525935A1 (en) 1985-07-19 1985-07-19 METHOD AND SYSTEM FOR CRUSHING GROUND MATERIAL

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EP0208947A2 true EP0208947A2 (en) 1987-01-21
EP0208947A3 EP0208947A3 (en) 1987-08-26
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EP (1) EP0208947B1 (en)
JP (1) JPS6227049A (en)
KR (1) KR900005174B1 (en)
BR (1) BR8603401A (en)
CA (1) CA1280733C (en)
DE (2) DE3525935A1 (en)
ES (1) ES2000924A6 (en)
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CN109939783A (en) * 2019-04-17 2019-06-28 武汉耐恩贝有色金属科技有限公司 A kind of electronic waste recycles the device and method of recycling gold
WO2019159119A1 (en) * 2018-02-15 2019-08-22 Flsmidth A/S Comminution device feed mechanism and method
CN111437913A (en) * 2020-03-27 2020-07-24 苏州耀水源环境科技有限公司 Concrete waste material crushing treatment device
CN116474871A (en) * 2023-05-05 2023-07-25 哈尔滨工业大学 Aggregate grinder capable of adjusting grinding speed and strength

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CN109939783A (en) * 2019-04-17 2019-06-28 武汉耐恩贝有色金属科技有限公司 A kind of electronic waste recycles the device and method of recycling gold
CN111437913A (en) * 2020-03-27 2020-07-24 苏州耀水源环境科技有限公司 Concrete waste material crushing treatment device
CN116474871A (en) * 2023-05-05 2023-07-25 哈尔滨工业大学 Aggregate grinder capable of adjusting grinding speed and strength
CN116474871B (en) * 2023-05-05 2023-09-19 哈尔滨工业大学 An aggregate grinder with adjustable grinding speed and intensity

Also Published As

Publication number Publication date
KR870000964A (en) 1987-03-10
US4709864A (en) 1987-12-01
EP0208947A3 (en) 1987-08-26
BR8603401A (en) 1987-02-24
KR900005174B1 (en) 1990-07-20
CA1280733C (en) 1991-02-26
JPH0323216B2 (en) 1991-03-28
JPS6227049A (en) 1987-02-05
IN166964B (en) 1990-08-11
DE3525935A1 (en) 1987-01-29
ES2000924A6 (en) 1988-04-01
DE3662235D1 (en) 1989-04-13
EP0208947B1 (en) 1989-03-08

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