EP0461409A1 - Roll crusher - Google Patents

Roll crusher Download PDF

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Publication number
EP0461409A1
EP0461409A1 EP91107803A EP91107803A EP0461409A1 EP 0461409 A1 EP0461409 A1 EP 0461409A1 EP 91107803 A EP91107803 A EP 91107803A EP 91107803 A EP91107803 A EP 91107803A EP 0461409 A1 EP0461409 A1 EP 0461409A1
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EP
European Patent Office
Prior art keywords
depressions
mill according
roller
roller mill
designed
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Granted
Application number
EP91107803A
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German (de)
French (fr)
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EP0461409B1 (en
Inventor
Bernhard Dipl.-Ing. Peterwerth
Gerhard Dipl.-Ing. Kästingschäfer
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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
    • B02C4/30—Shape or construction of rollers
    • B02C4/305—Wear resistant rollers

Definitions

  • the invention relates to a roller mill according to the preamble of claim 1.
  • Roller mills of the type required in the preamble of claim 1 serve as so-called bed roller mills for compacting and / or comminuting brittle regrind. Since the rollers are pressed against one another at very high pressure and the material to be ground often has great hardness, considerable wear occurs on the roller surface in the operation of such roller mills.
  • Rollers - in ring or segment construction - with a smooth or profiled peripheral surface are known.
  • webs running in the axial direction have already been provided, which have a relatively low height and are arranged at a circumferential distance from one another which is a multiple of the web height.
  • Rollers are also known, the surfaces of which have shallow depressions which have approximately the shape of egg briquettes.
  • the invention has for its object to develop a roller mill of the type required in the preamble of claim 1 in such a way that, with a relatively simple construction, particularly good intake behavior of the ground material to be comminuted or compacted is achieved.
  • the dimensions and the shape of the depressions are selected such that, during the grinding process, ground solidified under pressure remains in the depressions and essentially fills them.
  • regrind flows into the depressions at the beginning of the milling operation and solidifies in these depressions under high grinding pressure.
  • the wells i.e. in particular by a suitable position of the mutually opposite side surfaces of the depressions to one another and a suitable ratio of depth to width, the regrind adheres to the depressions and essentially fills the depressions, so that the regrind stored in the depressions is in common with the hard material layer of the roller Surface forms.
  • the surface of the solidified ground material stored in the recesses has a substantially higher roughness than the surface of the hard material layer of the roller. This increases the friction between the roller and the regrind when the regrind is drawn into the nip. In the compact zone between the material to be ground and the grinding roller, there is a greater compression of the material to be ground, which increases the feed angle and thus the throughput.
  • the average width of the depressions expediently corresponds to 0.5 to 1.5 times, preferably 0.8 to 1.2 times, the average feed particle size of the ground material.
  • the mean depression width can therefore advantageously be chosen to be approximately equal to the mean feed grain size.
  • the pull-in behavior essentially depends on the number of depressions present in the contact zone. In general, the more depressions there are in the contact zone, the better the material feed. In order to ensure that the roller mill is evenly drawn in and runs smoothly, it is advantageous if the area proportion of the depressions on the entire surface of the roller - measured in a narrow zone running in the longitudinal direction of the roller and corresponding to the contact zone - is at least approximately constant over the entire circumference of the roller . The surface of the depressions filled with regrind in the contact area is thus approximately constant during operation.
  • the design of the roller surface according to the invention reduces the relative movement, slippage, sliding and flow between the regrind and the roller; at the same time the sliding wear decreases.
  • the material stored in the depressions forms an autogenous wear protection.
  • the amount of metal wear on the roller surface is lower in accordance with the surface conditions.
  • the higher friction also reduces the risk of regrind extrusion in the grinding gap; this allows a higher maximum grinding pressure.
  • the opposite side surfaces of the depressions are connected to one another via a concavely curved base surface. This ensures only a slight increase in the intensity of stress.
  • FIG. 1 shows a section of the surface of a roller 1 with a number of round depressions 2. These depressions 2 are expediently distributed at a uniform spacing over the roller surface.
  • FIG. 5 illustrates (on an enlarged scale) a section (along the line V-V of FIG. 1) through the roller 1 in the region of a depression 2.
  • the depression 2 is delimited by a side wall with mutually opposite side surfaces (for example 3, 4 according to FIG. 5), the middle tangents 5, 6 on these side surfaces 3, 4 forming an angle ⁇ with one another which is greater than the difference between 360 ° and 2 times the wall friction angle of the ground material. If the bulk material friction angle is 15 °, for example, the angle ⁇ is greater than 330 °.
  • the depth T of the depressions 2 is greater than half the mean width B of the depressions.
  • the mean depression width B is preferably chosen equal to the mean feed grain size.
  • ground material 8 flows into the depressions 2 and solidifies therein under the effect of the high grinding pressure. Due to the design of the depressions 2, in particular due to the front inclination of the side surfaces 3, 4 and the ratio of T / B, the ground material 8 adheres and remains in the depressions 2. Its surface 8a lies approximately at the level of the roller surface 1a and is improved by it significantly higher roughness the intake of the ground material in the nip.
  • FIG. 2 shows an embodiment of a roller 1 with oval depressions 2 '.
  • a section (along the line V-V of Figure 2) corresponds to the illustration in Figure 5.
  • FIG. 3 shows a variant in which the depressions 12 are designed as grooves which are parallel to one another and in Circumferential direction of the roller 1 run.
  • a section along the line V-V of FIG. 3 corresponds to the illustration in FIG. 5.
  • the roller 1 shows a variant in which the depressions 12 'of the roller 1 are designed as grooves which run in the form of single-thread or multi-thread screw lines.
  • the angle ⁇ (which mutually opposite side surfaces 3, 4 of the depressions form with one another) has a value which is somewhat less than 360 °. In the context of the invention, it is particularly advantageous if the mutually opposite side surfaces 3, 4 of the depressions 2 (or 2 ', 12, 12') run approximately parallel to one another.
  • FIG. 6 shows an example in which the angle ⁇ between the side surfaces 3 ′′, 4 ′′ of the depressions 2 ′′ is chosen to be somewhat larger than 360 °, so that the depressions 2 ′′ slightly widen inwardly in the form of a dovetail.
  • the ground material 8 adheres particularly well in the depressions 2 ′′.
  • rollers are provided with a wear layer on their circumference, the depressions according to the invention can be made in this wear layer.
  • the rolls are designed as full rolls, depressions are formed by recesses which are provided in the roll material.
  • roll profile according to the invention can also be produced by cladding.

Abstract

The invention relates to a roller crusher in which the roller surface (1a) has depressions (2) whose diameters and shape are selected in such a way that during the milling process milling material (8) remains in the depressions (2) and essentially fills them. As a result, a particularly good drawing-in characteristic of the milling material is achieved. …<IMAGE>…

Description

Die Erfindung betrifft eine Walzenmühle entsprechend dem Oberbegriff des Anspruches 1.The invention relates to a roller mill according to the preamble of claim 1.

Walzenmühlen der im Oberbegriff des Anspruches 1 vorausgesetzten Art dienen als sogenannte Gutbettwalzenmühlen zur Kompaktierung und/oder Zerkleinerung von sprödem Mahlgut. Da die Walzen mit sehr hohem Druck gegeneinander gepreßt werden und das Mahlgut häufig eine große Härte aufweist, tritt im Betrieb derartiger Walzenmühlen vielfach ein beträchtlicher Verschleiß an der Walzenoberfläche auf.Roller mills of the type required in the preamble of claim 1 serve as so-called bed roller mills for compacting and / or comminuting brittle regrind. Since the rollers are pressed against one another at very high pressure and the material to be ground often has great hardness, considerable wear occurs on the roller surface in the operation of such roller mills.

Bekannt sind Walzen - in Ring- oder Segmentkonstruktion - mit glatter oder profilierter Umfangsfläche. Als Profilierung wurden bereits in Achsrichtung verlaufende Stege vorgesehen, die eine verhältnismäßig geringe Höhe aufweisen und in einem Umfangsabstand voneinander angeordnet sind, der ein mehrfaches der Steghöhe beträgt. Bekannt sind weiterhin Walzen, deren Oberflächen flache Vertiefungen aufweisen, die etwa die Form von Eierbriketts besitzen.Rollers - in ring or segment construction - with a smooth or profiled peripheral surface are known. As a profile, webs running in the axial direction have already been provided, which have a relatively low height and are arranged at a circumferential distance from one another which is a multiple of the web height. Rollers are also known, the surfaces of which have shallow depressions which have approximately the shape of egg briquettes.

Der Erfindung liegt die Aufgabe zugrunde, eine Walzenmühle der im Oberbegriff des Anspruches 1 vorausgesetzten Art dahin weiterzuentwickeln, daß bei verhältnismäßig einfacher Bauweise ein besonders gutes Einzugsverhalten des zu zerkleinernden bzw. zu kompaktierenden Mahlgutes erreicht wird.The invention has for its object to develop a roller mill of the type required in the preamble of claim 1 in such a way that, with a relatively simple construction, particularly good intake behavior of the ground material to be comminuted or compacted is achieved.

Diese Aufgabe wird erfindungsgemäß durch das kennzeichnende Merkmal des Anspruches 1 gelöst. Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by the characterizing feature of claim 1. Appropriate configurations the invention are the subject of the dependent claims.

Erfindungsgemäß sind die Abmessungen und die Form der Vertiefungen derart gewählt, daß beim Mahlprozeß unter Druck verfestigtes Mahlgut in den Vertiefungen verbleibt und diese im wesentlichen ausfüllt.According to the invention, the dimensions and the shape of the depressions are selected such that, during the grinding process, ground solidified under pressure remains in the depressions and essentially fills them.

Bei den der Erfindung zugrundeliegenden Versuchen stellte sich heraus, daß bei geeigneter Wahl von Abmessungen und Form der Vertiefungen zu Beginn des Mahlbetriebes Mahlgut in die Vertiefungen einfließt und sich in diesen Vertiefungen unter hohem Mahldruck verfestigt. Durch die Gestaltung der Vertiefungen, d.h. insbesondere durch eine geeignete Lage der einander gegenüberliegenden Seitenflächen der Vertiefungen zueinander und ein zweckmäßiges Verhältnis von Tiefe zu Breite, haftet das Mahlgut in den Vertiefungen und füllt die Vertiefungen im wesentlichen aus, so daß das in den Vertiefungen eingelagerte Mahlgut mit der Hartwerkstoffschicht der Walze eine gemeinsame Oberfläche bildet.In the experiments on which the invention is based, it was found that with a suitable choice of dimensions and shape of the depressions, regrind flows into the depressions at the beginning of the milling operation and solidifies in these depressions under high grinding pressure. By designing the wells, i.e. in particular by a suitable position of the mutually opposite side surfaces of the depressions to one another and a suitable ratio of depth to width, the regrind adheres to the depressions and essentially fills the depressions, so that the regrind stored in the depressions is in common with the hard material layer of the roller Surface forms.

Die Oberfläche des in die Vertiefungen eingelagerten, verfestigten Mahlgutes besitzt dabei eine wesentlich höhere Rauhigkeit als die Oberfläche der Hartwerkstoffschicht der Walze. Dadurch erhöht sich beim Einzug des Mahlgutes in den Walzenspalt die Reibung zwischen Walze und Mahlgut. In der Kompaktzone zwischen Mahlgut und Mahlwalze kommt es zu einer größeren Verdichtung des aufgegebenen Mahlgutes, was eine Erhöhung des Einzugswinkels und damit des Durchsatzes mit sich bringt.The surface of the solidified ground material stored in the recesses has a substantially higher roughness than the surface of the hard material layer of the roller. This increases the friction between the roller and the regrind when the regrind is drawn into the nip. In the compact zone between the material to be ground and the grinding roller, there is a greater compression of the material to be ground, which increases the feed angle and thus the throughput.

Zweckmäßig entspricht die mittlere Breite der Vertiefungen dem 0,5- bis 1,5-fachen, vorzugsweise dem 0,8- bis 1,2-fachen, der mittleren Aufgabekorngröße des Mahlgutes. Die mittlere Vertiefungsbreite kann also vorteilhaft etwa gleich der mittleren Aufgabekorngröße gewählt werden.The average width of the depressions expediently corresponds to 0.5 to 1.5 times, preferably 0.8 to 1.2 times, the average feed particle size of the ground material. The mean depression width can therefore advantageously be chosen to be approximately equal to the mean feed grain size.

Das Einzugsverhalten hängt wesentlich von der Anzahl der in der Kontaktzone vorhandenen Vertiefungen ab. Je mehr Vertiefungen sich in der Kontaktzone befinden, umso besser ist im allgemeinen der Materialeinzug. Um einen gleichmäßigen Einzug und eine hohe Laufruhe der Walzenmühle zu gewährleisten, ist es günstig, wenn der Flächenanteil der Vertiefungen an der gesamten Oberfläche der Walze - gemessen in einer in Walzenlängsrichtung verlaufenden, der Kontaktzone entsprechenden schmalen Zone - über den gesamten Walzenumfang zumindest annähernd konstant ist. Damit ist die Oberfläche der mit Mahlgut gefüllten Vertiefungen im Kontaktbereich während des Betriebes annähernd konstant.The pull-in behavior essentially depends on the number of depressions present in the contact zone. In general, the more depressions there are in the contact zone, the better the material feed. In order to ensure that the roller mill is evenly drawn in and runs smoothly, it is advantageous if the area proportion of the depressions on the entire surface of the roller - measured in a narrow zone running in the longitudinal direction of the roller and corresponding to the contact zone - is at least approximately constant over the entire circumference of the roller . The surface of the depressions filled with regrind in the contact area is thus approximately constant during operation.

Durch die erfindungsgemäße Gestaltung der Walzenoberfläche wird die Relativbewegung, der Schlupf, das Gleiten und Fließen zwischen Mahlgut und Walze reduziert; zugleich sinkt der Gleitverschleiß. Das in den Vertiefungen eingelagerte Material bildet einen autogenen Verschleißschutz. Die metallische Verschleißmenge an der Walzenoberfläche ist entsprechend den Flächenverhältnissen geringer. Die höhere Reibung verringert ferner die Gefahr einer Mahlgutextrusion im Mahlspalt; damit ist ein höherer maximaler Mahldruck zulässig.The design of the roller surface according to the invention reduces the relative movement, slippage, sliding and flow between the regrind and the roller; at the same time the sliding wear decreases. The material stored in the depressions forms an autogenous wear protection. The amount of metal wear on the roller surface is lower in accordance with the surface conditions. The higher friction also reduces the risk of regrind extrusion in the grinding gap; this allows a higher maximum grinding pressure.

Um die in den Vertiefungen auftretenden Erhöhungen der Beanspruchung zu minimieren, ist es günstig, wenn die einander gegenüberliegenden Seitenflächen der Vertiefungen über eine konkav gewölbte Bodenfläche miteinander verbunden sind. Hierdurch wird eine nur geringe Zunahme der Beanspruchungsintensität gewährleistet.In order to minimize the increases in stress occurring in the depressions, it is advantageous if the opposite side surfaces of the depressions are connected to one another via a concavely curved base surface. This ensures only a slight increase in the intensity of stress.

Einige Ausführungsbeispiele der Erfindung sind in der Zeichnung veranschaulicht. Es zeigen

Fig.1
eine Aufsicht auf ein Teilstück eines ersten Ausführungsbeispieles der Erfindung (mit runden Vertiefungen),
Fig.2
eine Aufsicht auf ein zweites Ausführungsbeispiel (mit ovalen Vertiefungen),
Fig.3
eine Aufsicht auf ein Ausführungsbeispiel mit in Umfangsrichtung umlaufenden rillenförmigen Vertiefungen,
Fig.4
eine Aufsicht auf ein Ausführungsbeispiel mit schraubenlinienförmig umlaufenden Vertiefungen,
Fig.5
einen Schnitt längs der Linien V-V der Fig.1 bis 4,
Fig.6
einen Schnitt (entsprechend Fig.5) durch eine etwas anders geformte Vertiefung.
Some embodiments of the invention are illustrated in the drawing. Show it
Fig. 1
a plan view of a portion of a first embodiment of the invention (with round depressions),
Fig. 2
a top view of a second embodiment (with oval depressions),
Fig. 3
2 shows a top view of an exemplary embodiment with groove-shaped depressions running around in the circumferential direction,
Fig. 4
2 shows a top view of an exemplary embodiment with helically encircling depressions,
Fig. 5
a section along the lines VV of Figures 1 to 4,
Fig. 6
a section (corresponding to Figure 5) through a slightly differently shaped recess.

Fig.1 zeigt ein Teilstück der Oberfläche einer Walze 1 mit einer Anzahl von runden Vertiefungen 2. Diese Vertiefungen 2 sind zweckmäßig in gleichmäßiger Abstandsteilung über die Walzenoberfläche verteilt.1 shows a section of the surface of a roller 1 with a number of round depressions 2. These depressions 2 are expediently distributed at a uniform spacing over the roller surface.

Fig.5 veranschaulicht (in vergrößertem Maßstab) einen Schnitt (längs der Linie V-V der Fig.1) durch die Walze 1 im Bereich einer Vertiefung 2.5 illustrates (on an enlarged scale) a section (along the line V-V of FIG. 1) through the roller 1 in the region of a depression 2.

Die Vertiefung 2 wird von einer Seitenwand mit einander gegenüberliegenden Seitenflächen (z.B. 3, 4 gemäß Fig.5) begrenzt, wobei die mittleren Tangenten 5, 6 an diesen Seitenflächen 3, 4 miteinander einen Winkel α bilden, der größer ist als die Differenz zwischen 360° und dem 2-fachen Wandreibungswinkel des Mahlgutes. Beträgt der Schüttgutreibwinkel beispielsweise 15°, so ist der Winkel α größer als 330°.The depression 2 is delimited by a side wall with mutually opposite side surfaces (for example 3, 4 according to FIG. 5), the middle tangents 5, 6 on these side surfaces 3, 4 forming an angle α with one another which is greater than the difference between 360 ° and 2 times the wall friction angle of the ground material. If the bulk material friction angle is 15 °, for example, the angle α is greater than 330 °.

Die einander gegenüberliegenden Seitenflächen 3, 4 der Vertiefungen 2, die über Rundungen 3a, 4a in die Walzenoberfläche 1a übergehen, sind über eine konkav gewölbte Bodenfläche 7 miteinander verbunden.The mutually opposite side surfaces 3, 4 of the depressions 2, which merge into the roller surface 1a via curves 3a, 4a, are connected to one another via a concavely curved base surface 7.

Die Tiefe T der Vertiefungen 2 ist größer als die halbe mittlere Breite B der Vertiefungen. Die mittlere Vertiefungsbreite B wird dabei vorzugsweise gleich der mittleren Aufgabekorngröße gewählt.The depth T of the depressions 2 is greater than half the mean width B of the depressions. The mean depression width B is preferably chosen equal to the mean feed grain size.

Zu Beginn des Mahlbetriebes fließt Mahlgut 8 in die Vertiefungen 2 und verfestigt sich darin unter der Wirkung des hohen Mahldruckes. Durch die Gestaltung der Vertiefungen 2, insbesondere durch die Frontenneigung der Seitenflächen 3, 4 und das Verhältnis von T/B, haftet und verbleibt das Mahlgut 8 in den Vertiefungen 2. Seine Oberfläche 8a liegt dabei etwa in Höhe der Walzenoberfläche 1a und verbessert durch ihre wesentlich höhere Rauhigkeit den Einzug des Mahlgutes in den Walzenspalt.At the start of the grinding operation, ground material 8 flows into the depressions 2 and solidifies therein under the effect of the high grinding pressure. Due to the design of the depressions 2, in particular due to the front inclination of the side surfaces 3, 4 and the ratio of T / B, the ground material 8 adheres and remains in the depressions 2. Its surface 8a lies approximately at the level of the roller surface 1a and is improved by it significantly higher roughness the intake of the ground material in the nip.

Fig.2 zeigt ein Ausführungsbeispiel einer Walze 1 mit ovalen Vertiefungen 2'. Ein Schnitt (längs der Linie V-V der Fig.2) entspricht dabei der Darstellung in Fig.5.2 shows an embodiment of a roller 1 with oval depressions 2 '. A section (along the line V-V of Figure 2) corresponds to the illustration in Figure 5.

Während bei den in den Fig.1 und 2 dargestellten Ausführungsbeispielen die Vertiefungen als einzelne, mit Abstand voneinander angeordnete Ausnehmungen in der Walzenoberfläche ausgebildet sind, zeigt Fig.3 eine Variante, bei der die Vertiefungen 12 als Rillen ausgebildet sind, die parallel zueinander und in Umfangsrichtung der Walze 1 verlaufen. Auch hier entspricht ein Schnitt längs der Linie V-V der Fig.3 der Darstellung in Fig.5.While in the exemplary embodiments shown in FIGS. 1 and 2, the depressions are designed as individual, spaced-apart recesses in the roller surface, FIG. 3 shows a variant in which the depressions 12 are designed as grooves which are parallel to one another and in Circumferential direction of the roller 1 run. Here, too, a section along the line V-V of FIG. 3 corresponds to the illustration in FIG. 5.

Fig.4 zeigt eine Variante, bei der die Vertiefungen 12' der Walze 1 als Rillen ausgebildet sind, die in Form von ein- oder mehrgängigen Schraubenlinien verlaufen.4 shows a variant in which the depressions 12 'of the roller 1 are designed as grooves which run in the form of single-thread or multi-thread screw lines.

Bei den bisher erläuterten Ausführungsbeispielen besitzt der Winkel α (den einander gegenüberliegende Seitenflächen 3, 4 der Vertiefungen miteinander bilden) einen Wert, der etwas kleiner als 360° ist. Im Rahmen der Erfindung ist es besonders vorteilhaft, wenn die einander gegenüberliegenden Seitenflächen 3, 4 der Vertiefungen 2 (bzw. 2', 12, 12') annähernd parallel zueinander verlaufen.In the exemplary embodiments explained so far, the angle α (which mutually opposite side surfaces 3, 4 of the depressions form with one another) has a value which is somewhat less than 360 °. In the context of the invention, it is particularly advantageous if the mutually opposite side surfaces 3, 4 of the depressions 2 (or 2 ', 12, 12') run approximately parallel to one another.

Fig.6 zeigt schließlich ein Beispiel, bei dem der Winkel α zwischen den Seitenflächen 3'', 4'' der Vertiefungen 2'' etwas größer als 360° gewählt ist, so daß sich die Vertiefungen 2'' nach innen schwalbenschwanzförmig leicht erweitern. Das Mahlgut 8 haftet hierbei besonders gut in den Vertiefungen 2''.Finally, FIG. 6 shows an example in which the angle α between the side surfaces 3 ″, 4 ″ of the depressions 2 ″ is chosen to be somewhat larger than 360 °, so that the depressions 2 ″ slightly widen inwardly in the form of a dovetail. The ground material 8 adheres particularly well in the depressions 2 ″.

Werden die Walzen an ihrem Umfang mit einer Verschleißschicht versehen, so können die erfindungsgemäßen Vertiefungen in dieser Verschleißschicht angebracht werden.If the rollers are provided with a wear layer on their circumference, the depressions according to the invention can be made in this wear layer.

Sind die Walzen dagegen als Vollwalzen ausgebildet, so werden Vertiefungen durch Ausnehmungen gebildet, die im Walzenmaterial vorgesehen sind.If, on the other hand, the rolls are designed as full rolls, depressions are formed by recesses which are provided in the roll material.

Die Herstellung des erfindungsgemäßen Walzenprofiles kann schließlich auch durch Auftragschweißung erfolgen.Finally, the roll profile according to the invention can also be produced by cladding.

Claims (11)

Walzenmühle, enthaltend zwei gegensinnig angetriebene, mit hohem Druck gegeneinander gepreßte Walzen, deren Oberfläche Vertiefungen (2, 2', 2'', 12, 12') aufweist, dadurch gekennzeichnet, daß die Abmessungen und die Form der Vertiefungen derart gewählt sind, daß beim Mahlprozeß unter Druck verfestigtes Mahlgut (8) in den Vertiefungen verbleibt und diese im wesentlichen ausfüllt.Roller mill, comprising two oppositely driven rollers pressed against one another at high pressure, the surface of which has depressions (2, 2 ', 2' ', 12, 12'), characterized in that the dimensions and the shape of the depressions are chosen such that During the grinding process, solidified material (8) remains in the depressions and essentially fills them. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß die Abmessungen und die Form der Vertiefungen (2, 2', 2'', 12, 12') wie folgt gewählt sind: - einander gegenüberliegende Seitenflächen (3, 4 bzw. 3'', 4'') der Vertiefungen bilden miteinander einen Winkel (α), der größer ist als die Differenz zwischen 360° und dem 2-fachen Wandreibungswinkel des Mahlgutes; - die Tiefe (T) ist größer als die halbe mittlere Breite (B) der Vertiefungen. Roller mill according to claim 1, characterized in that the dimensions and the shape of the depressions (2, 2 ', 2'', 12, 12') are selected as follows: - mutually opposite side surfaces (3, 4 or 3 '', 4 '') of the recesses form an angle (α) which is greater than the difference between 360 ° and 2 times the wall friction angle of the ground material; - The depth (T) is greater than half the average width (B) of the wells. Walzenmühle nach Anspruch 2, dadurch gekennzeichnet, daß einander gegenüberliegende Seitenflächen der Vertiefungen annähernd parallel zueinander verlaufen.Roller mill according to claim 2, characterized in that opposite side surfaces of the depressions run approximately parallel to one another. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß der Flächenanteil der Vertiefungen (12, 12') an der gesamten Oberfläche der Walze (1), gemessen in einer in Walzenlängsrichtung verlaufenden, der Kontaktzone entsprechenden schmalen Zone, über den gesamten Walzenumfang zumindest annähernd konstant ist.Roller mill according to claim 1, characterized in that the surface portion of the depressions (12, 12 ') on the entire surface of the roller (1), measured in a narrow zone corresponding to the contact zone and running in the longitudinal direction of the roller, over the entire area Roll circumference is at least approximately constant. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß die Vertiefungen (12) als parallel zueinander in Umfangsrichtung verlaufende Rillen ausgebildet sind.Roller mill according to claim 1, characterized in that the depressions (12) are designed as grooves running parallel to one another in the circumferential direction. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß die Vertiefungen (12') als in Form von ein- oder mehrgängigen Schraubenlinien verlaufenden Rillen ausgebildet sind.Roller mill according to claim 1, characterized in that the depressions (12 ') are designed as grooves running in the form of single or multi-start helical lines. Walzenmühle nach Anspruch 2, dadurch gekennzeichnet, daß die einander gegenüberliegenden Seitenflächen (3, 4) der Vertiefungen (2) über eine konkav gewölbte Bodenfläche (7) miteinander verbunden sind.Roller mill according to Claim 2, characterized in that the mutually opposite side surfaces (3, 4) of the depressions (2) are connected to one another via a concavely curved base surface (7). Walzenmühle nach Anspruch 2, dadurch gekennzeichnet, daß die mittlere Breite (B) der Vertiefungen dem 0,5- bis 1,5-fachen, vorzugsweise dem 0,8- bis 1,2-fachen, der mittleren Aufgabekorngröße des Mahlgutes entspricht.Roller mill according to claim 2, characterized in that the average width (B) of the depressions corresponds to 0.5 to 1.5 times, preferably 0.8 to 1.2 times, the average feed size of the millbase. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß die Vertiefungen (2, 2') als einzelne mit Abstand voneinander angeordnete Ausnehmungen von vorzugsweise runder oder ovaler Form ausgebildet sind.Roller mill according to claim 1, characterized in that the depressions (2, 2 ') are designed as individual, spaced-apart recesses of preferably round or oval shape. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß die Vertiefungen in einer den Walzenumfang bildenden Verschleißschicht vorgesehen sind.Roll mill according to claim 1, characterized in that the depressions are provided in a wear layer forming the circumference of the roll. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß die Walzen als Vollwalzen ausgebildet sind und die Vertiefungen durch im Walzenmaterial vorgesehene Ausnehmungen gebildet werden.Roll mill according to claim 1, characterized in that the rolls are designed as full rolls and the depressions are formed by recesses provided in the roller material.
EP91107803A 1990-06-12 1991-05-14 Roll crusher Expired - Lifetime EP0461409B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4018785A DE4018785A1 (en) 1990-06-12 1990-06-12 ROLL MILL
DE4018785 1990-06-12

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EP0461409A1 true EP0461409A1 (en) 1991-12-18
EP0461409B1 EP0461409B1 (en) 1995-08-09

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DE (2) DE4018785A1 (en)
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CN102397802A (en) * 2011-11-18 2012-04-04 中信重工机械股份有限公司 Novel squeeze roller type roller surface structure

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DE4235298A1 (en) * 1992-10-20 1994-04-21 Krupp Polysius Ag Grinding roll mfr. by build-up welding of anti-wear layer - with the anti-wear layer made up of separate blocks
DE4235499A1 (en) * 1992-10-21 1994-04-28 Krupp Polysius Ag Applicn of hard wear-resistant layer onto a grinding roll - with pockets in the roll edge regions for retention of the material being ground.
DE19634639A1 (en) * 1996-08-27 1998-03-12 Lucia Thoma Recycling Und Baum Device and method for deforming rocks and rock mixtures
DE102005027729A1 (en) * 2005-06-16 2006-12-28 Khd Humboldt Wedag Gmbh Roll crusher for breaking hot cement clinker
US8695907B2 (en) 2012-04-20 2014-04-15 Metso Minerals Industries, Inc. Roller crusher with cheek plates
US8708265B2 (en) 2012-04-20 2014-04-29 Metso Minerals Industries, Inc. Roller crusher with balancing cylinders

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CN102397802B (en) * 2011-11-18 2015-09-09 中信重工机械股份有限公司 A kind of Novel squeeze roller type roller surface structure

Also Published As

Publication number Publication date
US5199657A (en) 1993-04-06
ES2075263T3 (en) 1995-10-01
EP0461409B1 (en) 1995-08-09
DE59106190D1 (en) 1995-09-14
DE4018785A1 (en) 1991-12-19

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