EP0819026A1 - Process for finely crushing grinding stock - Google Patents

Process for finely crushing grinding stock

Info

Publication number
EP0819026A1
EP0819026A1 EP96910026A EP96910026A EP0819026A1 EP 0819026 A1 EP0819026 A1 EP 0819026A1 EP 96910026 A EP96910026 A EP 96910026A EP 96910026 A EP96910026 A EP 96910026A EP 0819026 A1 EP0819026 A1 EP 0819026A1
Authority
EP
European Patent Office
Prior art keywords
grinding
speed
tracks
gap
regrind
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
EP96910026A
Other languages
German (de)
French (fr)
Other versions
EP0819026B1 (en
Inventor
Otto Heinemann
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius AG
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 Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0819026A1 publication Critical patent/EP0819026A1/en
Application granted granted Critical
Publication of EP0819026B1 publication Critical patent/EP0819026B1/en
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
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/005—Crushers with non-coaxial toothed discs with intersecting axes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C1/00—Crushing or disintegrating by reciprocating members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2/00—Crushing or disintegrating by gyratory or cone crushers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills

Definitions

  • the invention relates to a method for the fine comminution of regrind in accordance with the preamble of claim 1, the regrind in a bed being subjected to a pressure of over 50 MPa by pressing once between two opposite surfaces.
  • the method for fine comminution according to the preamble of claim 1 is known for example from DE-B-27 08 053.
  • so-called material bed roller mills come into consideration, which consist of two rollers pressed against one another at high pressure and driven in opposite directions.
  • the performance of these roller mills is limited by the fact that the grinding tools, i.e. the rollers have to transport the regrind into the pressing zone.
  • the "transport speed" is strongly dependent on the friction conditions of the as yet unpressed bulk material on the roller surface and on how stable the material bed is in order to transmit the pressure.
  • the ground material is thus drawn into the grinding gap by the roller surfaces.
  • the actual pressing begins with an automatically adjusting feed angle.
  • the pressing speed at the beginning of the compression can be calculated.
  • the pressing speed is understood to mean the speed at which the distance between opposite surface points of the two rollers is reduced.
  • the pressing speed at the beginning of the pressure loading is directly related to the throughput performance of the roller mill.
  • An increase in the performance of such mills is only possible by increasing the circumferential roller speed to the extent that the supply of goods by roller transport before pressing can keep up with the throughput speed in the press zone at the desired press density. Otherwise, the material flow is expected to break off and the result is a high instability of the pressing process. For this reason, roller mills can only be operated at initial press speeds of around 0.5 m / s.
  • the invention is therefore based on the object of improving the method according to the preamble of claim 1 in such a way that the throughput is increased.
  • the one-time pressing between two opposite surfaces should take place in such a way that the distance between opposite surface points of the two surfaces in the region of the pressing decreases at the beginning of the compressive stress at an initial speed of at least 1 m / s.
  • this method is implemented by using an annular mill, as is known, for example, from DE-A-42 27 188.
  • DE-A-42 27 188 With regard to the structure of the ring mill, reference is made to DE-A-42 27 188.
  • a very high level of energy utilization and energy conversion is possible when comminuting the bed.
  • Fig.l is a schematic sectional view of an annular mill
  • FIG. 2 shows a sectional view along the line II-II of Fig.l;
  • FIG. 1 shows a schematic sectional illustration of an annular mill 1. It essentially contains a fixed first grinding track 2, a second grinding track that can be tumbled under this first grinding track and relative to it. track 3 and a swash plate 4, which can be driven by a suitable rotary drive device (not shown).
  • the swash plate 4 serves to generate a wobble movement of the lower second grinding track 3 in such a way that the width of the grinding gap 5 formed between the two grinding tracks 2, 3 periodically increases and decreases in the circumferential direction of the grinding tracks.
  • 1 shows the smallest or narrowest width in the left half of the drawing and the largest width of the grinding gap 5 between the two grinding tracks 2, 3 in the right half of the drawing.
  • the two grinding tracks 2, 3 are designed as essentially flat ring tracks and are inclined toward one another by a flat angle.
  • the swash plate 4 has a cover 6 running around it, by which the grinding gap 5 is covered to the outside in at least one peripheral partial zone which covers the gap area of the greatest width.
  • the fixed first grinding track 2 is aligned substantially horizontally and is carried in a device frame, not shown.
  • the tumble-movable second grinding track 3 is arranged below the first grinding track 2.
  • the first grinding track 2 has a central material feed opening 2a which opens out in relation to the center of the second grinding track 3 and into which a device suitable for feeding the material to be ground opens.
  • the two opposing grinding tracks 2, 3 are essentially concentric to a vertical or aligned at least approximately vertical device axis 7.
  • This device axis 7 coincides with the axis of rotation of a drive pin 8.
  • This drive pin 8 protrudes downwards and outwards from the bottom side opposite the second grinding track 3, preferably horizontally oriented, to such an extent that it can be connected to a rotary drive device located underneath.
  • the swash plate 4 is axially supported in the device frame via a plurality of distributed axial thrust bearings 9 and is guided radially via at least one radial bearing 10 provided on the drive pin 8.
  • the tumble-movable second grinding track 3 which is formed by a disk-shaped body, is supported on the one hand via a plurality of distributed axial thrust bearings 11 on the upper side 4a of the swash plate 4 which is opposite to the drive pin 8 and is inclined at a flat angle to the horizontal, and on the other hand guided radially upward from this inclined upper side 4a, which projects at right angles upwards and is inclined with respect to the device axis 7, via radial bearings 12.
  • the second grinding track 3 has an upwardly facing, completely flat lower grinding surface 3b, which is oriented perpendicular to its axis of rotation 3c.
  • the first grinding track 2 likewise has a flat grinding surface 2b, which, however, is inclined by the angle ⁇ with respect to the horizontal.
  • the grinding surfaces 2b, 3b of the first and second grinding tracks 2, 3 lie essentially parallel in the gap area of the smallest or narrowest width (cf. left half of FIG. 1).
  • the grinding surfaces can also have any other suitable configuration, such as a conical or concave shape.
  • the two grinding tracks 2, 3 are pressed against each other by a pressure device, not shown.
  • This pressure device can be formed, for example, by an upper and lower pressure bar, which interact with pressure-actuated cylinder-piston units.
  • Such a printing device is known, for example, from DE-A-42 27 188.
  • the ground material is introduced via the material feed opening 2a of the first grinding path 2 and is fed radially to the grinding gap 5 from the inner circumference. The ground material is then discharged to the outside over the outer circumference of the grinding gap 5.
  • an internal material discharge scraper 13 is provided, which is behind the narrowest and in front of the largest width of the grinding gap 6. This inner discharge scraper 13 reliably ensures that previously ground comminuted material is discharged safely and that the grinding chamber or grinding gap area there is not clogged.
  • the swash plate 4 rotating at a certain speed brings about a periodic enlargement or reduction of the grinding gap 5.
  • FIG. 3 the vertical movement of the second grinding path 3 relative to the first grinding path 2 is shown via the angle of rotation of the swash plate 4.
  • the angular positions 0 °, 90 °, 180 and 270 ° are also entered in FIGS. 1 and 2.
  • the distance S E between the two grinding tracks 2, 3 is smallest, while the distance between the two grinding tracks is greatest at an angle of rotation of 270 °.
  • the regrind is placed in the rotation angle range of approximately 200 ° to 0 °, ie it reaches the second grinding path 3 radially outwards from the center.
  • the actual pressure load begins at an angle of rotation of approximately 55 ° and ends at 90 °, where the smallest grinding gap 5 is reached.
  • the actual pressing of the ground material takes place in this embodiment over an angular range of approximately 35 °. Depending on the type of ground material to be crushed and the size of the ring mill, the pressing can also take place over a larger angular range, for example up to 60 °.
  • the comminuted ground material is discharged from the ring mill via the material discharge scraper 13.
  • Circulation speed of the compression zone in the middle of the grinding path [m / s] 10 15 20 throughput [t / h] 485 725 970
  • the stroke of the second grinding track 3 and the vertical speed of this grinding track were measured via the various angular positions of the swash plate 4.
  • the vertical speed of the lower grinding track 3 at a certain angular position corresponds to the speed at which the distance from two vertically opposite surface points on the grinding tracks 2, 3 decreases or increases.
  • the stroke and the vertical speed of the second grinding track 3 are calculated as follows:
  • the vertical speed V ⁇ is plotted against the angular position ⁇ for the three circulating speeds 10, 15 and 20 m / s.
  • the vertical speed ie the initial speed at which the distance between opposite surfaces points of the two grinding tracks reduced, at the beginning of the pressure load above lm / s.
  • the vertical speed is 1.2 at an average peripheral speed of the compression zone of 10 m / s, 1.79 at 15 m / s and 2.39 m / s at 20 m / s.
  • the vertical speed i.e. the speed of opposite surface points decreases to 0 m / s until the maximum pressure is reached.
  • the maximum pressure is over 50 MPa and can also reach values up to 500 MPa. At such pressures, the so-called material bed shredding takes place.
  • the agglomerates formed in this way can be deagglomerated in a known manner in a downstream device.
  • the ring mill is operated at an initial speed of at least 1 m / s at the beginning of the compressive stress, the comminution of already very fine feed material and of goods with a high degree of gaps in the bulk as well as the comminution of moist material and such good is possible Gap degree in the fill is filled by a fluid.
  • Gap degree in the fill is filled by a fluid.
  • throughputs which are at least twice as large can be achieved with a ring mill which is operated according to the method according to the invention.
  • the process according to the invention for comminuting material beds is thus designed for the highest throughput rates.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Road Signs Or Road Markings (AREA)
  • Glass Compositions (AREA)
  • Paints Or Removers (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

PCT No. PCT/EP96/01494 Sec. 371 Date Sep. 17, 1997 Sec. 102(e) Date Sep. 17, 1997 PCT Filed Apr. 4, 1996 PCT Pub. No. WO96/31277 PCT Pub. Date Oct. 10, 1996A method and apparatus for comminuting granular mill feed material wherein the material is delivered in a stream to a gap between two rotary grinding tracks which confront one another, one of which is positioned at a small angle to the other so that in response to relative rotation of such tracks the width of the gap decreases to a minimum at an initial rate of at least 1 m/s. At the minimum width of the gap the material is subjected to comminuting pressure greater than 50 MPa.

Description

Verfahren zur Feinzerkleinerung von MahlgutProcess for fine grinding of regrind
Die Erfindung betrifft ein Verfahren zur Feinzerkleine¬ rung von Mahlgut gemäß dem Oberbegriff des Anspru- ches 1, wobei das Mahlgut in einer Schüttung durch ein¬ malige Pressung zwischen zwei gegenüberliegenden Flä¬ chen einem Druck von über 50 MPa ausgesetzt wird.The invention relates to a method for the fine comminution of regrind in accordance with the preamble of claim 1, the regrind in a bed being subjected to a pressure of over 50 MPa by pressing once between two opposite surfaces.
Das Verfahren zur Feinzerkleinerung gemäß dem Oberbe- griff des Anspruches 1 ist beispielsweise aus der DE-B- 27 08 053 bekannt. Zur Ausübung dieses Verfahrens, kom¬ men sog. Gutbett-Walzenmühlen in Betracht, die aus zwei mit hohem Druck gegeneinander gepreßten und gegensinnig angetriebenen Walzen bestehen.The method for fine comminution according to the preamble of claim 1 is known for example from DE-B-27 08 053. To carry out this method, so-called material bed roller mills come into consideration, which consist of two rollers pressed against one another at high pressure and driven in opposite directions.
Die Leistungsfähigkeit dieser Walzenmühlen ist jedoch dadurch begrenzt, daß die Mahlwerkzeuge, d.h. die Wal¬ zen, das Mahlgut in die Preßzone transportieren müssen. Dabei ist die "Transportgeschwindigkeit" stark von den Reibverhältnissen der noch nicht gepreßten Gutschüttung auf der Walzenoberfläche und davon abhängig, wie stabil das Gutbett ist, um den Druck zu übertragen. Das Mahl¬ gut wird somit von den Walzenoberflächen in den Mahl- spalt eingezogen. Die eigentliche Pressung beginnt bei einem sich selbständig einstellenden Einzugswinkel. An¬ hand der Umfangsgeschwindigkeit der Mahlwalzen läßt sich die Preßgeschwindigkeit zu Beginn der Druckbean¬ spruchung berechnen. Unter der Preßgeschwindigkeit wird dabei die Geschwindigkeit verstanden, mit der sich der Abstand gegenüberliegender Flächenpunkte der beiden Walzen verringert.However, the performance of these roller mills is limited by the fact that the grinding tools, i.e. the rollers have to transport the regrind into the pressing zone. The "transport speed" is strongly dependent on the friction conditions of the as yet unpressed bulk material on the roller surface and on how stable the material bed is in order to transmit the pressure. The ground material is thus drawn into the grinding gap by the roller surfaces. The actual pressing begins with an automatically adjusting feed angle. On the basis of the peripheral speed of the grinding rollers, the pressing speed at the beginning of the compression can be calculated. The pressing speed is understood to mean the speed at which the distance between opposite surface points of the two rollers is reduced.
Die Preßgeschwindigkeit zu Beginn der Druckbeanspru¬ chung steht in direktem Zusammenhang mit der Durchsatz- leistung der Walzenmühle. Eine Steigerung der Lei¬ stungsfähigkeit derartiger Mühlen ist durch eine Erhö¬ hung der Walzen-Umfangsgeschwindigkeit nur soweit mög¬ lich, wie die Gutzuführung durch den Walzentransport vor der Pressung mit der Durchzugsgeschwindigkeit in der Preßzone bei der gewünschten Preßdichte mithalten kann. Ansonsten ist ein Abreißen des Materialflusses zu erwarten und die Folge ist eine hohe Instabilität des Preßvorganges. Walzenmühlen können aus diesem Grunde nur mit Anfangs-Preßgeschwindigkeiten betrieben werden, die bei etwa 0,5 m/s liegen.The pressing speed at the beginning of the pressure loading is directly related to the throughput performance of the roller mill. An increase in the performance of such mills is only possible by increasing the circumferential roller speed to the extent that the supply of goods by roller transport before pressing can keep up with the throughput speed in the press zone at the desired press density. Otherwise, the material flow is expected to break off and the result is a high instability of the pressing process. For this reason, roller mills can only be operated at initial press speeds of around 0.5 m / s.
Der Erfindung liegt daher die Aufgabe zugrunde, das Verfahren gemäß dem Oberbegriff des Anspruches l dahingehend zu verbessern, daß die Durchsatzleistung erhöht wird.The invention is therefore based on the object of improving the method according to the preamble of claim 1 in such a way that the throughput is increased.
Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.This object is achieved by the characterizing features of claim 1.
Weitere Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Further embodiments of the invention are the subject of the dependent claims.
Erfindungsgemäß soll die einmalige Pressung zwischen zwei gegenüberliegenden Flächen derart erfolgen, daß sich im Bereich der Pressung der Abstand gegenüberlie¬ gender Flächenpunkte der beiden Flächen zu Beginn der Druckbeanspruchung mit einer Anfangsgeschwindigkeit von wenigstens 1 m/s verringert. In einem bevorzugten Aus- führungsbeispiel der Erfindung wird dieses Verfahren durch Verwendung einer Ringmühle verwirklicht, wie sie beispielsweise aus der DE-A-42 27 188 bekannt ist. Be¬ züglich des Aufbaus der Ringmühle wird auf die DE-A- 42 27 188 Bezug genommen. Mit dem erfindungsgemäßen Verfahren ist eine sehr hohe Energieausnutzung und Energieumsetzung bei der Gutbett- Zerkleinerung möglich. Ferner ist es möglich, sehr fei- nes Aufgabegut und Güter mit hohem Lückengrad in der Schüttung (eingeschlossenes Gas, Luft) sowie feuchtes Gut und solches Gut, dessen Lückengrad in der Schüttung durch ein Fluid ausgefüllt ist, zu zerkleinern. Die nach dem erfindungsgemäßen Verfahren arbeitenden Vor- richtungen sind enorm leistungsfähig und mit höchster Durchsatzleistung zu betreiben.According to the invention, the one-time pressing between two opposite surfaces should take place in such a way that the distance between opposite surface points of the two surfaces in the region of the pressing decreases at the beginning of the compressive stress at an initial speed of at least 1 m / s. In a preferred exemplary embodiment of the invention, this method is implemented by using an annular mill, as is known, for example, from DE-A-42 27 188. With regard to the structure of the ring mill, reference is made to DE-A-42 27 188. With the method according to the invention, a very high level of energy utilization and energy conversion is possible when comminuting the bed. It is also possible to comminute very fine feed material and goods with a high degree of gaps in the bed (enclosed gas, air) as well as moist goods and such goods whose gap level in the bed is filled with a fluid. The devices operating according to the method according to the invention are extremely powerful and can be operated with the highest throughput.
Weitere Vorteile und Ausgestaltungen der Erfindung wer¬ den anhand der nachfolgenden Beschreibung mit Bezug auf die Zeichnung näher erläutert.Further advantages and refinements of the invention are explained in more detail with reference to the following description with reference to the drawing.
In der Zeichnung zeigen:The drawing shows:
Fig.l eine schematische Schnittdarstellung ei- ner Ringmühle;Fig.l is a schematic sectional view of an annular mill;
Fig.2 eine Schnittdarstellung längs der Linie II-II der Fig.l;2 shows a sectional view along the line II-II of Fig.l;
Fig.3 eine Darstellung der Vertikalbewegung über den Drehwinkel und3 shows a representation of the vertical movement over the angle of rotation and
Fig.4 eine Darstellung der Vertikalgeschwindig¬ keit über den Drehwinkel.4 shows a representation of the vertical speed over the angle of rotation.
Fig.l zeigt eine schematische Schnittdarstellung einer Ringmühle 1. Sie enthält im wesentlichen eine festste¬ hende erste Mahlbahn 2, eine unter dieser ersten Mahl- bahn und relativ zu ihr taumelbewegliche zweite Mahl- bahn 3 und eine Taumelscheibe 4, die durch eine ge¬ eignete, nicht dargestellte Drehantriebseinrichtung an¬ getrieben werden kann. Die Taumelscheibe 4 dient zur Erzeugung einer Taumelbewegung der unteren zweiten Mahlbahn 3 in der Weise, daß sich die Weite des zwi¬ schen den beiden Mahlbahnen 2, 3 gebildeten Mahl- spalts 5 in Umfangsrichtung der Mahlbahnen periodisch vergrößert und verkleinert. In Fig.l ist in der linken Zeichnungshälfte die kleinste bzw. engste Weite und in der rechten Zeichnungshälfte die größte Weite des Mahl- spalts 5 zwischen den beiden Mahlbahnen 2, 3 veran¬ schaulicht.1 shows a schematic sectional illustration of an annular mill 1. It essentially contains a fixed first grinding track 2, a second grinding track that can be tumbled under this first grinding track and relative to it. track 3 and a swash plate 4, which can be driven by a suitable rotary drive device (not shown). The swash plate 4 serves to generate a wobble movement of the lower second grinding track 3 in such a way that the width of the grinding gap 5 formed between the two grinding tracks 2, 3 periodically increases and decreases in the circumferential direction of the grinding tracks. 1 shows the smallest or narrowest width in the left half of the drawing and the largest width of the grinding gap 5 between the two grinding tracks 2, 3 in the right half of the drawing.
Wie eine Betrachtung der Fig.l und 2 erkennen läßt, sind die beiden Mahlbahnen 2, 3 als im wesentlichen ebene Ringbahnen ausgebildet und um einen flachen Win¬ kel ß gegeneinander geneigt. Die Taumelscheibe 4 trägt dabei eine mit ihr umlaufende Abdeckung 6, durch die der Mahlspalt 5 in zumindest einer den Spaltbereich größter Weite erfassenden Umfangsteilzone nach außen hin abgedeckt ist.As can be seen from a view of FIGS. 1 and 2, the two grinding tracks 2, 3 are designed as essentially flat ring tracks and are inclined toward one another by a flat angle. The swash plate 4 has a cover 6 running around it, by which the grinding gap 5 is covered to the outside in at least one peripheral partial zone which covers the gap area of the greatest width.
Die feststehende erste Mahlbahn 2 ist im wesentlichen horizontal ausgerichtet und wird in einem nicht näher dargestellten Vorrichtungsgestell getragen. Die taumel- bewegliche zweite Mahlbahn 3 ist unterhalb der ersten Mahlbahn 2 angeordnet. Hierbei weist die erste Mahl¬ bahn 2 eine gegenüber dem Zentrum der zweiten Mahl- bahn 3 ausmündende zentrale Gutzuführδffnung 2a auf, in die eine für die Zuführung des Mahlgutes geeignete Ein¬ richtung mündet.The fixed first grinding track 2 is aligned substantially horizontally and is carried in a device frame, not shown. The tumble-movable second grinding track 3 is arranged below the first grinding track 2. In this case, the first grinding track 2 has a central material feed opening 2a which opens out in relation to the center of the second grinding track 3 and into which a device suitable for feeding the material to be ground opens.
Die beiden sich gegenüberliegenden Mahlbahnen 2, 3 sind im wesentlichen konzentrisch zu einer vertikalen oder zumindest annähernd vertikalen Vorrichtungsachse 7 aus¬ gerichtet. Diese Vorrichtungsachse 7 fällt mit der Drehachse eines Antriebszapfens 8 zusammen. Dieser An¬ triebszapfen 8 steht von der der zweiten Mahlbahn 3 entgegengesetzten, vorzugsweise horizontal ausgerichte¬ ten Unterseite nach unten und außen soweit vor, daß er mit einer darunterliegenden Drehantriebsvorrichtung verbunden werden kann.The two opposing grinding tracks 2, 3 are essentially concentric to a vertical or aligned at least approximately vertical device axis 7. This device axis 7 coincides with the axis of rotation of a drive pin 8. This drive pin 8 protrudes downwards and outwards from the bottom side opposite the second grinding track 3, preferably horizontally oriented, to such an extent that it can be connected to a rotary drive device located underneath.
Die Taumelscheibe 4 wird im Vorrichtungsgestell über mehrere verteilt angeordnete Axial-Drucklager 9 axial abgestützt und über wenigstens ein am Antriebszapfen 8 vorgesehenes Radiallager 10 radial geführt. Dagegen ist die von einem scheibenförmigen Körper gebildete, tau- melbewegliche zweite Mahlbahn 3 einerseits über mehrere verteilt angeordnete Axial-Drucklager 11 auf der dem Antriebszapfen 8 entgegengesetzten, gegenüber der Hori¬ zontalen um einem flachen Winkel geneigten Oberseite 4a der Taumelscheibe 4 abgestützt und andererseits an ei- nem von dieser geneigten Oberseite 4a rechtwinklig nach oben vorstehenden, gegenüber der Vorrichtungsachse 7 geneigten Führungszapfen 4b über Radiallager 12 radial geführt.The swash plate 4 is axially supported in the device frame via a plurality of distributed axial thrust bearings 9 and is guided radially via at least one radial bearing 10 provided on the drive pin 8. In contrast, the tumble-movable second grinding track 3, which is formed by a disk-shaped body, is supported on the one hand via a plurality of distributed axial thrust bearings 11 on the upper side 4a of the swash plate 4 which is opposite to the drive pin 8 and is inclined at a flat angle to the horizontal, and on the other hand guided radially upward from this inclined upper side 4a, which projects at right angles upwards and is inclined with respect to the device axis 7, via radial bearings 12.
In dem dargestellten Ausführungsbeispiel besitzt die zweite Mahlbahn 3 eine nach oben weisende, vollkommen ebene untere Mahlfläche 3b, die senkrecht zu ihrer Drehachse 3c ausgerichtet ist. Die erste Mahlbahn 2 weist gleichfalls eine ebene Mahlfläche 2b auf, die je- doch um den Winkel ß gegenüber der Horizontalen geneigt ist. Auf diese Weise liegen sich die Mahlflächen 2b, 3b der ersten und zweiten Mahlbahn 2, 3 im Spaltbereich der kleinsten bzw. engsten Weite im wesentlichen parallel gegenüber (vgl. linke Hälfte der Fig.l) . Selbstverständlich können die Mahlflächen auch jede andere geeignete Ausgestaltung aufweisen, wie beispielsweise eine konische oder konkave Form.In the exemplary embodiment shown, the second grinding track 3 has an upwardly facing, completely flat lower grinding surface 3b, which is oriented perpendicular to its axis of rotation 3c. The first grinding track 2 likewise has a flat grinding surface 2b, which, however, is inclined by the angle β with respect to the horizontal. In this way, the grinding surfaces 2b, 3b of the first and second grinding tracks 2, 3 lie essentially parallel in the gap area of the smallest or narrowest width (cf. left half of FIG. 1). Of course, the grinding surfaces can also have any other suitable configuration, such as a conical or concave shape.
Die beiden Mahlbahnen 2, 3 werden über eine nicht näher dargestellte Druckeinrichtung gegeneinander gepreßt. Diese Druckeinrichtung kann beispielsweise durch einen oberen und unteren Druckbalken gebildet werden, die mit druckmittelbetätigten Zylinder-Kolbeneinheiten zusam- menwirken. Eine derartige Druckeinrichtung ist bei¬ spielsweise aus der DE-A-42 27 188 bekannt.The two grinding tracks 2, 3 are pressed against each other by a pressure device, not shown. This pressure device can be formed, for example, by an upper and lower pressure bar, which interact with pressure-actuated cylinder-piston units. Such a printing device is known, for example, from DE-A-42 27 188.
Im Betrieb der Ringmühle 1 wird das Mahlgut über die Gutzuführδffnung 2a der ersten Mahlbahn 2 eingeführt und dem Mahlspalt 5 radial vom inneren Umfang her zuge¬ führt. Das zerkleinerte Mahlgut wird dann über den äu¬ ßeren Umfang des Mahlspalts 5 nach außen ausgetragen. Um große und größte Durchsatzleistungen dieser Ring¬ mühle 1 zu ermöglichen, ist ein innerer Gutaustrags- kratzer 13 vorgesehen, der hinter der engsten und vor der größten Weite des Mahlspaltes 6 liegt. Dieser in¬ nere Gutaustragskratzer 13 sorgt auf zuverlässige Weise dafür, daß zuvor zerkleinertes Mahlgut sicher ausgetra¬ gen und keine Verstopfung des dortigen Mahlraumes bzw. Mahlspaltbereiches hervorgerufen wird.In the operation of the ring mill 1, the ground material is introduced via the material feed opening 2a of the first grinding path 2 and is fed radially to the grinding gap 5 from the inner circumference. The ground material is then discharged to the outside over the outer circumference of the grinding gap 5. In order to enable large and greatest throughputs of this ring mill 1, an internal material discharge scraper 13 is provided, which is behind the narrowest and in front of the largest width of the grinding gap 6. This inner discharge scraper 13 reliably ensures that previously ground comminuted material is discharged safely and that the grinding chamber or grinding gap area there is not clogged.
Die mit einer bestimmten Drehzahl umlaufende Taumel- scheibe 4 bewirkt eine periodische Vergrößerung bzw. Verkleinerung des Mahlspaltes 5. In Fig.3 ist die Ver- tikalbewegung der zweiten Mahlbahn 3 gegenüber der er¬ sten Mahlbahn 2 über den Drehwinkel der Taumelscheibe 4 dargestellt. Die Winkelstellungen = 0°, 90°, 180 und 270° sind in den Fig.l und 2 ebenfalls eingetragen. Bei der Winkelstellung 90° ist der Abstand SE zwischen den beiden Mahlbahnen 2, 3 am kleinsten, während der Abstand zwischen den beiden Mahlbahnen beim Drehwinkel von 270° am größten ist. In dem Drehwinkelbereich von etwa 200° bis 0° wird das Mahlgut vorgelegt, d.h. es gelangt von der Mitte radial nach außen auf die zweite Mahlbahn 3. Bei einem Drehwinkel von etwa 0° hat sich eine ausreichende Mahlgutschüttung aufgebaut. Die ei¬ gentliche Druckbeanspruchung beginnt bei einem Drehwin- kel von etwa 55° und endet bei 90°, wo der kleinste Mahlspalt 5 erreicht wird. Die eigentliche Pressung des Mahlgutes erfolgt somit bei diesem Ausführungsbeispiel über einen Winkelbereich von etwa 35°. Je nach Art des zu zerkleinernden Mahlgutes und der Größe der Ringmühle kann die Pressung auch über einen größeren Winkelbe- reich, beispielsweise bis zu 60° erfolgen. Bei einem Drehwinkel von etwa 160° wird das zerkleinerte Mahlgut über den Gutaustragskratzer 13 aus der Ringmühle ausge¬ tragen.The swash plate 4 rotating at a certain speed brings about a periodic enlargement or reduction of the grinding gap 5. In FIG. 3, the vertical movement of the second grinding path 3 relative to the first grinding path 2 is shown via the angle of rotation of the swash plate 4. The angular positions = 0 °, 90 °, 180 and 270 ° are also entered in FIGS. 1 and 2. In the angular position 90 °, the distance S E between the two grinding tracks 2, 3 is smallest, while the distance between the two grinding tracks is greatest at an angle of rotation of 270 °. The regrind is placed in the rotation angle range of approximately 200 ° to 0 °, ie it reaches the second grinding path 3 radially outwards from the center. The actual pressure load begins at an angle of rotation of approximately 55 ° and ends at 90 °, where the smallest grinding gap 5 is reached. The actual pressing of the ground material takes place in this embodiment over an angular range of approximately 35 °. Depending on the type of ground material to be crushed and the size of the ring mill, the pressing can also take place over a larger angular range, for example up to 60 °. At a rotation angle of approximately 160 °, the comminuted ground material is discharged from the ring mill via the material discharge scraper 13.
Die der Erfindung zugrundliegenden Versuche wurden mit folgenden Parametern durchgeführt:The tests on which the invention is based were carried out with the following parameters:
Versuch I II IIITrial I II III
Mittlerer Mahlbahnradius [mm] 525 525 525Average grinding path radius [mm] 525 525 525
Mahlbahnbreite [mm] 200 200 200Grinding track width [mm] 200 200 200
Schülpenstärke [mm] 28 28 28Leg thickness [mm] 28 28 28
Höhe der Schüttung bei Kompressionsbeginn [mm] 48 48 48Height of the bed at the start of compression [mm] 48 48 48
Mahlkraft [kN] .393 6.393 6.393Grinding force [kN] .393 6,393 6,393
Umlaufgeschwindigkeit der Kompressionszone in der Mitte der Mahlbahn [m/s] 10 15 20 Durchsatz [t/h] 485 725 970Circulation speed of the compression zone in the middle of the grinding path [m / s] 10 15 20 throughput [t / h] 485 725 970
Antriebsleistung [kW] 290 1.935 2.580 maximaler Druck [MPa] 250 250 250Drive power [kW] 290 1,935 2,580 maximum pressure [MPa] 250 250 250
Bei den Versuchen wurden über die verschiedenen Winkel- Stellungen der Taumelscheibe 4 der Hub der zweiten Mahlbahn 3 sowie die Vertikalgeschwindigkeit dieser Mahlbahn gemessen. Die Vertikelgeschwindigkeit der un¬ teren Mahlbahn 3 bei einer bestimmten Winkelstellung entspricht der Geschwindigkeit, mit der sich der Ab¬ stand von zwei vertikal gegenüberliegenden Flächenpunk¬ ten auf den bei den Mahlbahnen 2, 3 verringert bzw. vergrößert.In the experiments, the stroke of the second grinding track 3 and the vertical speed of this grinding track were measured via the various angular positions of the swash plate 4. The vertical speed of the lower grinding track 3 at a certain angular position corresponds to the speed at which the distance from two vertically opposite surface points on the grinding tracks 2, 3 decreases or increases.
Bei den Versuchen wurden dabei folgende Werte ermit telt:The following values were determined in the tests:
Winkel Hub Vertikalgeschwindigkeit beiAngle stroke vertical speed at
10 m/s 15 m/s 20 m/s10 m / s 15 m / s 20 m / s
[Grad] [mm] [m/s] [m/s] [m/s[Degrees] [mm] [m / s] [m / s] [m / s
0 0,0 2,1 3,12 4,160 0.0 2.1 3.12 4.16
10 19,0 2,0 3,07 4,1010 19.0 2.0 3.07 4.10
20 37,3 2,0 2,93 3,9120 37.3 2.0 2.93 3.91
30 54,6 1,8 2,70 3,6030 54.6 1.8 2.70 3.60
40 70,2 1,6 2,39 3,1940 70.2 1.6 2.39 3.19
50 83,6 1,3 2,01 2,6750 83.6 1.3 2.01 2.67
55 89,4 1.2 1,79 2,3955 89.4 1.2 1.79 2.39
60 94,5 1,0 1,56 2,0860 94.5 1.0 1.56 2.08
65 98.9 0,9 1,32 1,7665 98.9 0.9 1.32 1.76
70 102,6 0,7 1,07 1,4270 102.6 0.7 1.07 1.42
75 105,4 0,5 0,81 1,0875 105.4 0.5 0.81 1.08
80 107,5 0,4 0,54 0,7280 107.5 0.4 0.54 0.72
85 108,7 0,2 0,27 0,3685 108.7 0.2 0.27 0.36
90 109,2 - 0,0 - 0,00 - 0,0090 109.2 - 0.0 - 0.00 - 0.00
100 107,5 - 0,4 - 0,54 - 0,72100 107.5 - 0.4 - 0.54 - 0.72
110 102,6 - 0,7 - 1,07 - 1,42110 102.6 - 0.7 - 1.07 - 1.42
120 94,5 - 1,0 - 1,56 - 2,08120 94.5 - 1.0 - 1.56 - 2.08
130 83,6 - 1,3 - 2,01 - 2,67130 83.6 - 1.3 - 2.01 - 2.67
140 70,2 - 1,6 - 2,39 - 3,19140 70.2 - 1.6 - 2.39 - 3.19
150 54,6 - 1,8 - 2,70 - 3,60150 54.6-1.8-2.70-3.60
160 37,3 - 2,0 - 2,93 - 3,91160 37.3 - 2.0 - 2.93 - 3.91
170 19,0 - 2,0 - 3,07 - 4,10170 19.0 - 2.0 - 3.07 - 4.10
180 - 0,0 - 2,1 - 3,12 - 4, 16180 - 0.0 - 2.1 - 3.12 - 4, 16
190 - 19,0 - 2,0 - 3,07 - 4, 10190 - 19.0 - 2.0 - 3.07 - 4, 10
200 - 37,3 - 2,0 - 2,93 - 3,91 Winkel Hub Vertikalgeschwindigkeit bei a 10 m/s 15 m/s 20 m/s [Grad] [mm] [m/s] [m/s] [m/s]200 - 37.3 - 2.0 - 2.93 - 3.91 Angle stroke vertical speed at a 10 m / s 15 m / s 20 m / s [degrees] [mm] [m / s] [m / s] [m / s]
210 • 54,6 1,8 2,70 3,60 220 • 70,2 1,6 2,39 3,19 230 • 83,6 1,3 2,01 2,67 240 94,5 1,0 1,56 2,08 250 102,6 0,7 1,07 1,42 260 107,5 0,4 0,54 0,72 270 109,2 0,0 0,00 0,00 280 107, .5 0,4 0,54 0,72 290 102, 6 0,7 1,07 1,42 300 94, 5 1,0 1,56 2,08 310 83, 6 1,3 2,01 2,67 320 70,2 1,6 2,39 3,19 330 54,6 1,8 2,70 3,60 340 37,3 2,0 2,93 3,91 350 19,0 2,0 3,07 4,10 360 0,0 2,1 3,12 4,16210 • 54.6 1.8 2.70 3.60 220 • 70.2 1.6 2.39 3.19 230 • 83.6 1.3 2.01 2.67 240 94.5 1.0 1 , 56 2.08 250 102.6 0.7 1.07 1.42 260 107.5 0.4 0.54 0.72 270 109.2 0.0 0.00 0.00 280 107 .5 0 .4 0.54 0.72 290 102, 6 0.7 1.07 1.42 300 94, 5 1.0 1.56 2.08 310 83, 6 1.3 2.01 2.67 320 70, 2 1.6 2.39 3.19 330 54.6 1.8 2.70 3.60 340 37.3 2.0 2.93 3.91 350 19.0 2.0 3.07 4.10 360 0.0 2.1 3.12 4.16
Der Hub und die Vertikalgeschwindigkeit der zweiten Mahlbahn 3 berechnet sich wie folgt:The stroke and the vertical speed of the second grinding track 3 are calculated as follows:
Hub = sin (ß) * rm * sin (α) V = sin (ß) * rm * cos (α) omega mit ß [grad] Neigungswinkel zwischen den beiden Mahlbahnen 2, 3 rm [m] mittlerer Mahlbahnradius a [grad] Drehwinkelstellung omega [1/s] Winkel reguenzStroke = sin (ß) * rm * sin (α) V = sin (ß) * rm * cos (α) omega with ß [degrees] angle of inclination between the two grinding tracks 2, 3 rm [m] average grinding track radius a [degrees] Angle of rotation position omega [1 / s] angle reguenz
In Fig.4 ist die Vertikalgeschwindigkeit V^ über die Winkelstellung α für die drei Umlaufgeschwindigkei¬ ten 10, 15 und 20 m/s aufgetragen.In FIG. 4, the vertical speed V ^ is plotted against the angular position α for the three circulating speeds 10, 15 and 20 m / s.
Wie sich sehr anschaulich aus Fig.4 ergibt, beträgt die Vertikalgeschwindigkeit, d.h. die Anfangsgeschwindig¬ keit, mit der sich der Abstand gegenüberliegender Flä- chenpunkte der beiden Mahlbahnen verringert, zu Beginn der Druckbeanspruchung über l m/s. Im konkreten Fall beträgt die Vertikalgeschwindigkeit bei einer mittleren Umlaufgeschwindigkeit der Kompressionszone von 10 m/s 1,2, bei 15 m/s 1,79 und bei 20 m/s 2,39 m/s.As can be seen very clearly from FIG. 4, the vertical speed, ie the initial speed at which the distance between opposite surfaces points of the two grinding tracks reduced, at the beginning of the pressure load above lm / s. In the specific case, the vertical speed is 1.2 at an average peripheral speed of the compression zone of 10 m / s, 1.79 at 15 m / s and 2.39 m / s at 20 m / s.
Die Vertikalgeschwindigkeit, d.h. die Geschwindigkeit gegenüberliegender Flächenpunkte, baut sich bis zum Er¬ reichen des maximalen Drucks auf 0 m/s ab. Der maximale Druck liegt über 50 MPa und kann auch Werte bis zu 500 MPa erreichen. Bei derartigen Drücken findet die sog. Gutbettzerkleinerung statt. Die dabei gebildeten Agglomerate können in bekannter Weise in einer nachgeschalteten Einrichtung desagglomeriert werden.The vertical speed, i.e. the speed of opposite surface points decreases to 0 m / s until the maximum pressure is reached. The maximum pressure is over 50 MPa and can also reach values up to 500 MPa. At such pressures, the so-called material bed shredding takes place. The agglomerates formed in this way can be deagglomerated in a known manner in a downstream device.
Hohe Anfangsgeschwindigkeiten bedeuten bei kontinuier¬ lichen Systemen wie bei einer Ringmühle, ein hohes Durchsatzpotential mit entsprechenden hohen Energieum¬ setzungen.In the case of continuous systems such as in a ring mill, high initial speeds mean a high throughput potential with correspondingly high energy conversions.
Wird die Ringmühle zu Beginn der Druckbeanspruchung mit einer Anfangsgeschwindigkeit von wenigstens 1 m/s be¬ trieben, ist auch die Zerkleinerung von bereits sehr feinem Aufgabegut und von Gütern mit hohem Lückengrad in der Schüttung sowie die Zerkleinerung von feuchtem Gut und solchem Gut möglich, dessen Lückengrad in der Schύttung durch ein Fluid ausgefüllt ist. Gegenüber ei¬ ner Gutbettwalzenmühle, die mit einer Anfangsgeschwin¬ digkeit von maximal 0,5 m/s gefahren werden kann, las- sen sich mit einer Ringmühle, die nach dem erfindungs- gemäßen Verfahren betrieben wird, wenigstens doppelt so große Durchsätze erzielen. Das erfindungsgemäße Verfah¬ ren zur Gutbettzerkleinerung ist somit für höchste Durchsatzleistungen ausgelegt. If the ring mill is operated at an initial speed of at least 1 m / s at the beginning of the compressive stress, the comminution of already very fine feed material and of goods with a high degree of gaps in the bulk as well as the comminution of moist material and such good is possible Gap degree in the fill is filled by a fluid. In comparison to a material bed roller mill, which can be operated with an initial speed of maximum 0.5 m / s, throughputs which are at least twice as large can be achieved with a ring mill which is operated according to the method according to the invention. The process according to the invention for comminuting material beds is thus designed for the highest throughput rates.

Claims

Patentansprüche claims
1. Verfahren zur Feinzerkleinerung von Mahlgut, wobei das Mahlgut in einer Schüttung durch einmalige Pres¬ sung zwischen zwei gegenüberliegenden Flächen (2b, 3b) einem Druck von über 50 MPa ausgesetzt wird, da¬ durch gekennzeichnet, daß sich im Bereich der Pres¬ sung der Abstand gegenüberliegender Flächenpunkte der beiden Flächen zu Beginn der Druckbeanspruchung mit einer Anfangsgeschwindigkeit von wenigstens 1 m/s verringert.1. Process for the fine comminution of regrind, the regrind in a bed being subjected to a pressure of more than 50 MPa between two opposing surfaces (2b, 3b), characterized in that in the area of the pressing the distance between opposite surface points of the two surfaces at the beginning of the compressive stress is reduced at an initial speed of at least 1 m / s.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß sich die Geschwindigkeit gegenüberliegender Flä¬ chenpunkte bis zum Erreichen des maximalen Drucks auf 0 m/s abbaut.2. The method according to claim 1, characterized in that the speed of opposite surface points decreases to 0 m / s until the maximum pressure is reached.
3. Verfahren nach Anspruch 1, gekennzeichnet durch die Verwendung einer Vorrichtung zur Zerkleinerung von3. The method according to claim 1, characterized by the use of a device for comminuting
Mahlgut, enthaltend:Regrind containing:
a) eine feststehende erste Mahlbahn (2),a) a fixed first grinding track (2),
b) eine relativ zur ersten Mahlbahn taumelbe¬ wegliche zweite Mahlbahn (3),b) a second grinding path (3) which is tumble-free relative to the first grinding path,
c) eine angetriebene Taumelscheibe (4) zur Erzeu¬ gung einer Taumelbewegung der zweiten Mahl- bahn (3), durch die sich die Weite des zwischen den beiden Mahlbahnen gebildeten Mahlspalts (5) periodisch vergrößert und verkleinert, d) wobei die beiden Mahlbahnen als im wesentlichen ebene Ringbahnen ausgebildet und um einen fla¬ chen Winkel (ß) gegeneinander geneigt sind.c) a driven swash plate (4) for generating a wobble movement of the second grinding path (3), through which the width of the grinding gap (5) formed between the two grinding paths increases and decreases periodically, d) wherein the two grinding tracks are designed as essentially flat ring tracks and are inclined at a flat angle (β) with respect to one another.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Anfangsgeschwindigkeit der gegenüberliegen¬ den Flächenpunkte über die Drehzahl der rotierenden Taumelscheibe einstellbar ist.4. The method according to claim 3, characterized in that the initial speed of the opposite surface points is adjustable via the speed of the rotating swash plate.
5. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Pressung über einen Winkelbereich der Mahl- bahn erfolgt,' der weniger als 90°, vorzugsweise we¬ niger als 60° beträgt. 5. The method according to claim 3, characterized in that the pressing takes place over an angular range of the grinding track 'which is less than 90 °, preferably less than 60 °.
EP96910026A 1995-04-06 1996-04-04 Process for finely crushing grinding stock Expired - Lifetime EP0819026B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19513016A DE19513016A1 (en) 1995-04-06 1995-04-06 Process for fine grinding of regrind
DE19513016 1995-04-06
PCT/EP1996/001494 WO1996031277A1 (en) 1995-04-06 1996-04-04 Process for finely crushing grinding stock

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EP0819026A1 true EP0819026A1 (en) 1998-01-21
EP0819026B1 EP0819026B1 (en) 1999-10-20

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CN114561824B (en) * 2022-04-27 2022-08-09 河南新亚新科技包装材料有限公司 Pulping device for papermaking

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AU5051396A (en) 1996-10-17
US5961056A (en) 1999-10-05
ES2137682T3 (en) 1999-12-16
KR19980703603A (en) 1998-12-05
DE59603424D1 (en) 1999-11-25
AU695524B2 (en) 1998-08-13
DE19513016A1 (en) 1996-10-10
WO1996031277A1 (en) 1996-10-10
BR9604855A (en) 1998-06-16
AU5334896A (en) 1996-10-23
CA2216555A1 (en) 1996-10-10
TR199701119T1 (en) 1998-01-21
DK0819026T3 (en) 2000-04-03
ATE185709T1 (en) 1999-11-15

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