EP0396897B1 - Crushing roll - Google Patents

Crushing roll Download PDF

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Publication number
EP0396897B1
EP0396897B1 EP90106145A EP90106145A EP0396897B1 EP 0396897 B1 EP0396897 B1 EP 0396897B1 EP 90106145 A EP90106145 A EP 90106145A EP 90106145 A EP90106145 A EP 90106145A EP 0396897 B1 EP0396897 B1 EP 0396897B1
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EP
European Patent Office
Prior art keywords
roller
sheet metal
metal strips
grinding roller
grinding
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.)
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EP90106145A
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German (de)
French (fr)
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EP0396897A2 (en
EP0396897A3 (en
Inventor
Gerhard Kästingschäfer
Bernhard Peterwerth
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ThyssenKrupp Industrial Solutions AG
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Krupp Polysius AG
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Publication of EP0396897A2 publication Critical patent/EP0396897A2/en
Publication of EP0396897A3 publication Critical patent/EP0396897A3/en
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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 grinding roller, in particular for use in a material bed roller mill, in which brittle ground material is comminuted between two grinding rollers pressed against one another at high pressure, according to the preamble of claim 1.
  • a grinding roller of the required type is described for example in an older, post-published proposal for a roller mill (DE-A-38 33 614).
  • the main thing here is to clamp the individual jacket segments together with the aid of clamping plates which are provided on the end faces of the rolls and are clamped using clamping screws.
  • the wear of the segments that occurs when comminuting brittle regrind (for example cement clinker) and in particular the disturbing wear occurring in the area of the end faces of the segments and the repair work resulting therefrom are to be countered by the fact that the clamping plates completely cover the end faces of the segments cover and seal flush with the outer peripheral surface of the segments.
  • a grinding roller which, as can be seen from FIG. 3 there, is particularly suitable for use in vertical roller mills, spring roller mills or the like.
  • the roller jacket provided there as a wear ring is produced in a similar manner to the previously explained embodiment from a multiplicity of jacket segments which are clamped together on the roller base body with the aid of front-side clamping plates, the special feature is that the segments are held on the base body in a dovetail guide.
  • EP-A-271 336 proposes a grinding roller which is produced essentially in one piece with its roller jacket which forms the comminution surface, in that this jacket is composed of alternately adjacent and preferably twist-extending first and second strip parts of different wear resistance. Both the first strip parts with higher wear resistance and the second strip parts with lower wear resistance can be attached in place on the roller base body, for example by welding, cladding, plating or casting, so that a one-piece unit consisting of roller base body and solid ( in one piece) roller roll attached thereon.
  • the invention is based on the object of developing a grinding roller of the type required in the preamble of claim 1 in such a way that it maintains the interchangeability of its shell segments with a relatively simple construction for particularly good intake behavior of the ground material to be comminuted in a roller mill, in particular in a material bed roller mill, contributes.
  • a cylindrical base body is provided with a central circumferential dovetail projection, on which the hard metal plates provided with a corresponding dovetail recess are, as it were, pushed and strung together, a strip or a layer of the softer material then being provided as a separating strip or separating layer between these hard metal plates , furthermore, holes can be provided in this strip in order to pull wires or the like through there, and wherein retaining rings (with parts overlapping the strips) are screwed to the two ends for fastening the strips.
  • the roll shell according to this known embodiment thus consists, with respect to the formation of the actual grinding surface, of an extremely large number of individual hard metal strips stacked together and soft material strips placed or attached between them, which are made of any materials, such as soft metal, paint, enamel, wood , Paper, leather, fabric or the like, can exist.
  • the roll shell has yet another significant advantage in that the sheets cast into the segments prevent adjacent edges (profile edges) of the cast material from breaking out on the segments.
  • this grinding roller contains a roller base body 2 and a roller shell 3 which is arranged directly on the roller base body 2 and consists of individual - in the present example, six - annular segments 4 is composed. All six segments 4 are close to one another with the roller body 2 - preferably in the roller circumferential direction - Tense, as will be explained in more detail below. All segments 4 are formed uniformly and of equal size, so that they can be exchanged individually and with one another.
  • Each segment 4 is largely made of hard cast material, preferably hard cast (cast steel).
  • a suitable number of sheets 5 arranged with circumferential spacings are cast in, which are made of a material softer than the chilled cast iron, preferably of essentially non-hardenable steel (structural steel).
  • These sheets 5 run essentially transversely to the casing surface 3a and, viewed in cross-section according to FIG. 1, are oriented approximately radially to this casing surface 3a.
  • all of the sheets 5 are in the form of essentially transverse, i.e. H. essentially running in the direction of the roll longitudinal axis, sheet metal strips, which are basically in any length (viewed in the direction of the axial roll length) and in any, most appropriate forms, d. H. Unprofiled or profiled in the longitudinal direction can be formed.
  • the radial height h of these sheets or sheet strips 5 can generally be of any type. This radial height of the sheet metal strips 5 cast into the segments 4 will preferably correspond approximately to a predetermined outer wear layer thickness of the roll shell 3, as is indicated in FIG. 1 for two segments 4 by a dash-dotted line 6.
  • FIG. 2 shows a perspective illustration of how each or each segment 4 of the roll shell 3 is fastened on the roll base body 2 can be. Then a correspondingly large number of sufficiently large, axially extending grooves 7 are provided on the outer circumferential side of the roller base body 2, and correspondingly profiled clamping plate segments 8 are arranged on the two opposite end faces 2a, 2b of the roller base body in such a way that they each have the appropriate profile Grip over the inner circumferential sides 4a of the associated jacket segment 4.
  • Two clamping plate segments 8 acting on the two opposite end faces 2a, 2b of the roller base body 2 and of the respective segment 4 are then firmly clamped together with the aid of two axially extending clamping screws which are known per se and are therefore not illustrated in detail, so that they clamp the segments with the roller base body 2 tight.
  • each segment 4 is formed with two front-side, axially opposing fastening flanges 4b and 4c, which fit on the outer circumferential side 2c of the roller base body 2 and with the aid of screw bolts 9 (left) or by means of one-piece clamping rings 11 (right half) on this outer circumferential side 2c of the roller base body 2.
  • FIG. 3 Another embodiment of the attachment of the individual segments 4 on the outer circumferential side of the roller base body 2 is shown in FIG. 3.
  • each segment 4 is formed with two front-side, axially opposing fastening flanges 4b and 4c, which fit on the outer circumferential side 2c of the roller base body 2 and with the aid of screw bolts 9 (left) or by means of one-piece clamping rings 11 (right half) on this outer circumferential side 2c of the roller base body 2.
  • roller base body 2 is, as it were, sawtooth-shaped in cross-section on its outer circumferential side, the correspondingly profiled inner side 4d of the associated segment 4 being inserted in a suitable manner in each sawtooth-shaped recess 10.
  • the attachment of the segments 4 on the roller body 2 can be in one of the forms described (by means of clamping screws or fastening screws) or in any other suitable Way.
  • Profiling the outer circumferential side of the roller base body 2 and the matching profile of the inside of each segment 4 has the advantage that the roller shell firmly clamped on the roller base body is reliably and non-rotatably fixed on this roller base body.
  • the sheet metal strips 5 made of the softer material can be made very differently and can also be cast in the cast material of the segments 4. A number of possibilities for this can be seen in FIGS. 2 and 5-11.
  • the metal strips 5 are designed as straight, flat (flat) metal strips which extend parallel to the longitudinal axis 1 a of the roller over the entire axial length (working length) L of the roller shell 3.
  • the sheet metal strips 5a cast in segment 4 are straight and run parallel to the longitudinal axis of the roll.
  • the sheet metal strips 5a only extend over part of the axial length L of the roll shell, in such a way that in the peripheral sections of the segment 4 containing the sheet metal strips 5a, two such sheet metal strips 5a with an axial spacing from one another in a peripheral section Axial extension lie one behind the other, while in the peripheral sections immediately adjacent in the circumferential sections only one such sheet metal strip 5a is arranged approximately in the central longitudinal section of the roll shell or its segment 4.
  • the sheet metal strips 5a are thus approximately staggered or in a gap with one another in adjacent circumferential sections.
  • sheet metal strips 5a of the same type and of the same size as in the previous example (FIG. 5) are provided, but these sheet metal strips 5a are parallel to one another both in the circumferential direction and in the direction of the roll longitudinal axis in the adjacent circumferential sections of the segment 4 lie, and wherein in each corresponding circumferential section two such straight metal strips 5a are arranged one behind the other in axial extension.
  • a plurality of straight sheet metal strips 5b aligned in the axial extension and parallel to the longitudinal axis of the roll are provided in the adjacent circumferential sections of the segment 4, but of significantly shorter length than in the previous examples.
  • the sheet metal strips 5b which are cast into one another directly adjacent peripheral sections are staggered or arranged in a gap with one another and arranged such that the sheet metal strips 5c of a plurality of adjacent peripheral sections of the individual segments 4 form a relatively flat arrow shape.
  • Fig. 8 shows a further embodiment with straight, flat sheet metal strips 5c, the length of which corresponds only to a part of the axial length L of the segments 4 or the roll shell.
  • two such sheet metal strips 5c are in turn arranged approximately in the direction of the roll longitudinal axis.
  • FIG. 9 also shows an arrangement of two sheet metal strips 5d in principle in the same way as in FIG. 8, in this case.
  • the sheet metal strips 5d cast into the individual segments 4 are each designed such that they have a lengthwise direction have a corrugated shape, with otherwise approximately the same flat arrow shape arrangement as was explained previously with reference to FIG. 8.
  • Fig. 10 further illustrates an embodiment in which the sheet metal strips 5e of each jacket segment 4 also have a corrugated shape in their longitudinal direction, but only a single such corrugated sheet metal strip 5e is arranged in each corresponding peripheral section of the segment 4, which is substantially in the direction of the Roll longitudinal axis 1a extends and extends over most of the axial length of the roll shell or from its segment 4.
  • FIG. 11 shows another example, according to which the sheet metal strips 5f in turn extend over approximately the largest part of the axial length L of the roll shell 3 and are arranged in the circumferential direction at substantially equal distances from one another.
  • the special feature of this design is the fact that all sheet metal strips are of the same design 5f - as shown in FIG. 11 - have a flat bend, preferably a symmetrical, approximately arrow-like flat angle shape.
  • Each sheet metal strip 5f thus encloses a relatively obtuse angle ⁇ (similarly to the sheet strips 5c in FIG. 8 and 5d, respectively, which are axially one behind the other as in FIG. 9).
  • the vertices 5f - of each obtuse angle thus formed lie approximately on the axial longitudinal center of the roll shell 3 and, depending on the application, can point in the direction of rotation or opposite to the direction of rotation of the associated roll.
  • the grinding roller designed according to the invention is particularly well suited for use in a material bed roller mill of the type indicated at the outset, so that the brittle ground material to be comminuted can be drawn in particularly well and uniformly by the two grinding rollers arranged in the material bed roller mill.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Description

Die Erfindung betrifft eine Mahlwalze, insbesondere für die Verwendung in einer Gutbettwalzenmühle, in der sprödes Mahlgut zwischen zwei mit hohem Druck gegeneinander gepreßten Mahlwalzen zerkleinert wird, entsprechend dem Oberbegriff des Anspruches 1.The invention relates to a grinding roller, in particular for use in a material bed roller mill, in which brittle ground material is comminuted between two grinding rollers pressed against one another at high pressure, according to the preamble of claim 1.

Eine Mahlwalze der vorausgesetzten Art ist beispielsweise in einem älteren, nachveröffentlichten Vorschlag für eine Walzenmühle beschrieben (DE-A-38 33 614). Hier geht es vor allem um das Zusammenspannen der einzelnen Mantelsegmente mit Hilfe von Klemmplatten, die an den Walzenstirnseiten vorgesehen und mit Hilfe von Spannschrauben verspannt sind. Bei dieser früher vorgeschlagenen Walzenmühle will man dem bei der Zerkleinerung von sprödem Mahlgut (beispielsweise Zementklinker) auftretenden Verschleiß der Segmente und insbesondere dem im Bereich der Stirnseiten der Segmente auftretenden störenden Verschleiß sowie den dadurch bedingten Reparaturarbeiten dadurch begegnen, daß die Klemmplatten die Stirnseiten der Segmente vollständig abdecken und bündig mit der äußeren Umfangsfläche der Segmente abschließen.A grinding roller of the required type is described for example in an older, post-published proposal for a roller mill (DE-A-38 33 614). The main thing here is to clamp the individual jacket segments together with the aid of clamping plates which are provided on the end faces of the rolls and are clamped using clamping screws. In this roller mill proposed earlier, the wear of the segments that occurs when comminuting brittle regrind (for example cement clinker) and in particular the disturbing wear occurring in the area of the end faces of the segments and the repair work resulting therefrom are to be countered by the fact that the clamping plates completely cover the end faces of the segments cover and seal flush with the outer peripheral surface of the segments.

Aus DE-U-79 34 607 ist demgegenüber eine Mahlrolle bekannt, die - wie die dortige Figur 3 erkennen läßt - insbesondere für die Verwendung in Walzenschüsselmühlen, Federrollenmühlen oder dergleichen geeignet ist. Der dort als Verschleißring vorgesehene Rollenmantel ist in ähnlicher Weise wie bei der zuvor erläuterten Ausführungsart aus einer Vielzahl von Mantelsegmenten hergestellt, die mit Hilfe von stirnseitigen Klemmplatten auf dem Rollen-Grundkörper zusammengespannt sind, wobei das Besondere darin bestehen soll, daß die Segmente auf dem Grundkörper in einer Schwalbenschwanzführung gehaltert sind. Über das verwendete Material für die Mantelsegmente ist weder bei der Walzenmühle gemäß DE-A-38 33 614 noch in dieser DE-U-79 34 607 etwas ausgesagt.From DE-U-79 34 607, on the other hand, a grinding roller is known which, as can be seen from FIG. 3 there, is particularly suitable for use in vertical roller mills, spring roller mills or the like. The roller jacket provided there as a wear ring is produced in a similar manner to the previously explained embodiment from a multiplicity of jacket segments which are clamped together on the roller base body with the aid of front-side clamping plates, the special feature is that the segments are held on the base body in a dovetail guide. Nothing is said about the material used for the shell segments either in the roller mill according to DE-A-38 33 614 or in this DE-U-79 34 607.

In der EP-A-271 336 ist eine Mahlwalze vorgeschlagen, die im wesentlichen einstückig mit ihrem die Zerkleinerungsoberfläche bildenden Walzenmantel hergestellt wird, indem dieser Mantel aus abwechselnd nebeneinander liegenden und sich vorzugsweise mit Drall erstreckenden ersten und zweiten Streifenteilen unterschiedlicher Verschleißfestigkeit zusammensetzen. Dabei können sowohl die ersten Streifenteile mit höherem Verschleißwiderstand als .auch die zweiten Streifenteile mit geringerem Verschleißwiderstand an Ort und Stelle auf dem Walzengrundkörper angebracht sein, beispielsweise durch Aufschweißen, Auftragsschweißung, Plattieren oder Gießen, so daß sich jeweils eine einstückige Einheit aus Walzengrundkörper und fest (einstückig) darauf angebrachtem Walzenmantel ergibt.EP-A-271 336 proposes a grinding roller which is produced essentially in one piece with its roller jacket which forms the comminution surface, in that this jacket is composed of alternately adjacent and preferably twist-extending first and second strip parts of different wear resistance. Both the first strip parts with higher wear resistance and the second strip parts with lower wear resistance can be attached in place on the roller base body, for example by welding, cladding, plating or casting, so that a one-piece unit consisting of roller base body and solid ( in one piece) roller roll attached thereon.

Der Erfindung liegt nun die Aufgabe zugrunde, eine Mahlwalze der im Oberbegriff des Anspruches 1 vorausgesetzten Art in der Weise weiterzuentwickeln, daß sie unter Beibehaltung der Austauschbarkeit ihrer Mantelsegmente bei verhältnismäßig einfacher Konstruktion zu einem besonders guten Einzugsverhalten des zu zerkleinernden Mahlgutes in einer Walzenmühle, insbesondere in einer Gutbettwalzenmühle, beiträgt.The invention is based on the object of developing a grinding roller of the type required in the preamble of claim 1 in such a way that it maintains the interchangeability of its shell segments with a relatively simple construction for particularly good intake behavior of the ground material to be comminuted in a roller mill, in particular in a material bed roller mill, contributes.

Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Anspruches 1 angegebenen Merkmale gelöst, wobei vorteilhafte Ausgestaltungen dieser Erfindung in den-Unteransprüchen beschrieben sind.This object is achieved by the features specified in the characterizing part of claim 1, advantageous embodiments of this invention are described in the subclaims.

Aus der GB-A-439 895 ist es nun zwar bereits bekannt, bei Zylindern oder Rollen von Zerkleinerungsmaschinen, insbesondere zum Mahlen von Farbe, Schokolade oder dergleichen, den die Mahloberfläche bildenden Mantel aus einer Vielzahl von Hartmetallstreifen und zwischen je zwei benachbarten Hartmetallstreifen angeordneten Streifen oder Schichten aus weicherem Material zusammenzusetzen, wobei alle Streifen etwa rechtwinkelig zur Drehrichtung der Zylinderrollen verlaufen. In diesem Falle ist ein zylindrischer Grundkörper mit einem mittig umlaufenden Schwalbenschwanzvorsprung versehen, auf dem die mit einer entsprechenden Schwalbenschwanzausnehmung versehenen Härtmetallplatten gewissermaßen aufgeschoben und aneinandergereiht werden, wobei zwischen diesen Hartmetallplatten dann jeweils ein Streifen oder eine Schicht aus dem weicheren Material als Trennstreifen oder Trennschicht vorgesehen wird, wobei ferner in diesem Streifen Löcher vorgesehen werden können, um dort Drähte oder dergleichen hindurchzuziehen, und wobei zu beiden Stirnseiten Halterungsringe (mit die Streifen überlappenden Teilen) zur Befestigung der Streifen verschraubt sind. Der Walzenmantel gemäß dieser bekannten Ausführung besteht somit in bezug auf die Ausbildung der eigentlichen Mahlfläche aus einer äußerst großen Vielzahl von aneinander geschichteten einzelnen Hartmetallstreifen und dazwischen gelegten bzw. angebrachten Weichmaterialstreifen, die aus beliebigen Materialien, wie zum Beispiel weichem Metall, Farbe, Emaille, Holz, Papier, Leder, Stoff oder dergleichen mehr, bestehen können.From GB-A-439 895 it is now already known, in the case of cylinders or rollers of comminution machines, in particular for grinding paint, chocolate or the like, the casing forming the grinding surface from a multiplicity of hard metal strips and strips arranged between two adjacent hard metal strips or put together layers of softer material, with all strips being approximately at right angles to the direction of rotation of the cylindrical rollers. In this case, a cylindrical base body is provided with a central circumferential dovetail projection, on which the hard metal plates provided with a corresponding dovetail recess are, as it were, pushed and strung together, a strip or a layer of the softer material then being provided as a separating strip or separating layer between these hard metal plates , furthermore, holes can be provided in this strip in order to pull wires or the like through there, and wherein retaining rings (with parts overlapping the strips) are screwed to the two ends for fastening the strips. The roll shell according to this known embodiment thus consists, with respect to the formation of the actual grinding surface, of an extremely large number of individual hard metal strips stacked together and soft material strips placed or attached between them, which are made of any materials, such as soft metal, paint, enamel, wood , Paper, leather, fabric or the like, can exist.

Bei der erfindungsgemäßen Ausführung der insbesondere für die Zerkleinerung von sprödem Mahlgut bestimmten Mahlwalze sind dagegen in jedes weitgehend aus hartem Gußwerkstoff hergestellte Segment des Walzenmantels mehrere in der im Kennzeichen des Anspruches 1 erwähnten Art eingegossene Bleche aus weicherem Material vorgesehen. Auf diese Weise ergibt sich bereits nach sehr kurzem Mahlbetrieb eine leichte Abnutzung dieser Bleche an der Außenumfangsseite des Walzenmantels, so daß sich eine dadurch bedingte, gewissermaßen profierte äußere Manteloberfläche einstellt. Diese profierte Manteloberfläche trägt dabei zu einem gegenüber den bei Gutbettwalzenmühlen meistens verwendeten glattflächigen Walzenmänteln erheblich verbesserten Einzugsverhalten für das Mahlgut bei.In the embodiment according to the invention of the grinding roller, in particular intended for the comminution of brittle regrind, on the other hand, in each segment of the roller shell which is largely made of hard cast material, several sheets of softer material are cast in, as mentioned in the characterizing part of claim 1. In this way, even after a very short milling operation, these sheets become slightly worn on the outer circumferential side of the roll shell, so that a resultant, to a certain extent profound outer shell surface is obtained. This proficient jacket surface contributes to a significantly improved drawing-in behavior for the regrind compared to the smooth-surface roller jackets mostly used in material bed roller mills.

Es ist zwar bei Mahlwalzen, die vor allem für die Weichmüllerei Verwendung finden, auch bereits bekannt, die Manteloberfläche durch gesondertes Einarbeiten von Riffeln aufzurauhen bzw. gezielt zu profilieren. Dieses Riffeln der Manteloberfläche von Mahlwalzen muß jedoch entsprechend dem jeweils auftretenden Verschleiß der Manteloberfläche von Zeit zu Zeit wiederholt werden, was entsprechenden Montageaufwand und Nacharbeitungsaufwand sowie außerdem unerwünschte Ausfallzeiten mit sich bringt. Demgegenüber werden sich an einer erfindungsgemäßen Mahlwalze auch bei einem Verschleiß des harten Gußwerkstoffes, aus dem die Mantelsegmente überwiegend hergestellt sind, die eingegossenen Bleche immer in einem entsprechenden Verhältnis etwas stärker abnutzen, so daß während der ganzen Lebensdauer der Walzensegmente stets die gewünschte Oberflächenprofilierung des Walzenmantels erhalten bleibt, wodurch ein unerwünschter Nacharbeitungsaufwand, wie er zuvor geschildert worde ist, vermieden wird.In the case of grinding rollers, which are used above all for soft grinding, it is already known to roughen the surface of the casing or to profile it in a targeted manner by incorporating corrugations separately. This corrugation of the outer surface of grinding rollers must, however, be repeated from time to time in accordance with the wear of the outer surface that occurs, which entails corresponding assembly and reworking expenses as well as undesirable downtimes. In contrast, on a grinding roller according to the invention, even when the hard cast material from which the shell segments are predominantly made of wear, the cast-in sheets will always wear somewhat more in a corresponding ratio, so that the desired surface profiling of the roller shell is always obtained throughout the life of the roller segments remains what a unwanted reworking, as described above, is avoided.

Durch die erfindungsgemäße Profilierung der Oberfläche des Walzenmantels ergibt sich jedoch noch ein weiterer ins Gewicht fallender Vorteil dadurch, daß die in die Segmente eingegossenen Bleche ein Ausbrechen von benachbarten Kanten (Profilkanten) des Gußwerkstoffes an den Segmenten verhindern.By profiling the surface according to the invention However, the roll shell has yet another significant advantage in that the sheets cast into the segments prevent adjacent edges (profile edges) of the cast material from breaking out on the segments.

Einige Ausführungsbeispiele der Erfindung seien nachfolgend anhand der Zeichnung näher erläutert. In dieser Zeichnung zeigen

Fig. 1
einen Querschnitt durch eine erfindungsgemäß aufgebaute Mahlwalze;
Fig. 2
eine Perspektivansicht eines Walzengrundkörpers mit einem auf dessen Umfang angebrachten Segment;
Fig. 3 und 4
einen Teil-Längsschnitt bzw. einen Teil-Querschnitt von zwei weiteren Beispielen über die Anbringung und Befestigung von Segmenten auf dem Walzen gundkörper;
Fig. 5 bis 11
Teil-Aufsichten auf den abgewickelten Walzenmantel, zur Erläuterung verschiedener Ausführungsformen von in die einzelnen Segmente eingegossenen Blechen.
Some exemplary embodiments of the invention are explained in more detail below with reference to the drawing. Show in this drawing
Fig. 1
a cross section through a grinding roller constructed according to the invention;
Fig. 2
a perspective view of a roller body with a segment attached to its circumference;
3 and 4
a partial longitudinal section or a partial cross section of two further examples on the attachment and attachment of segments on the rolling base body;
5 to 11
Partial views of the unwound roll shell, to explain various embodiments of sheet metal cast into the individual segments.

In dem in Fig. 1 veranschaulichten Querschnitt durch die erfindungsgemäße ausgeführte Mahlwalze 1 läßt sich erkennen, daß diese Mahlwalze einen Walzengrundkörper 2 sowie einen Walzenmantel 3 enthält, der direkt auf dem Walzengrundkörper 2 angeordnet ist und aus einzelnen - im vorliegenden Beispiel aus sechs - ringförmigen Segmenten 4 zusammengesetzt ist. Alle sechs Segmente 4 sind mit dem Walzenkörper 2 - vorzugsweise in Walzenumfangsrichtung eng aneinanderliegend - verspannt, wie weiter unten noch näher erläutert wird.Alle Segmente 4 sind gleichförmig und gleich groß ausgebildet, so daß sie einzeln und auch untereinander ausgetauscht werden können.In the cross section illustrated in FIG. 1 through the grinding roller 1 designed according to the invention, it can be seen that this grinding roller contains a roller base body 2 and a roller shell 3 which is arranged directly on the roller base body 2 and consists of individual - in the present example, six - annular segments 4 is composed. All six segments 4 are close to one another with the roller body 2 - preferably in the roller circumferential direction - Tense, as will be explained in more detail below. All segments 4 are formed uniformly and of equal size, so that they can be exchanged individually and with one another.

Jedes Segment 4 ist weitgehend aus hartem Gußwerkstoff, vorzugsweise aus Hartguß (Stahlguß) hergestellt. Dabei ist in jedes Segment 4 des Walzenmantels 3 eine geeignete Anzahl von mit Umfangsabständen angeordneten Blechen 5 eingegossen, die aus einem gegenüber dem Hartguß weicheren Material, vorzugweise aus im wesentlichen nicht härtbarem Stahl (Baustahl) hergestellt sind. Diese Bleche 5 verlaufen im wesentlichen quer zur Manteloberfläche 3a, und sie sind - im Querschnitt gemäß Fig. 1 betrachtet - etwa radial zu dieser Manteloberfläche 3a ausgerichtet.Each segment 4 is largely made of hard cast material, preferably hard cast (cast steel). In each segment 4 of the roll shell 3, a suitable number of sheets 5 arranged with circumferential spacings are cast in, which are made of a material softer than the chilled cast iron, preferably of essentially non-hardenable steel (structural steel). These sheets 5 run essentially transversely to the casing surface 3a and, viewed in cross-section according to FIG. 1, are oriented approximately radially to this casing surface 3a.

Vorzugsweise sind alle Bleche 5 in Form von im wesentlichen querverlaufenden, d. h. im wesentlichen etwa in Richtung der Walzenlängsachse verlaufenden, Blechstreifen ausgeführt, die grundsätzlich in beliebigen Längen (in Richtung der axialen Walzenlänge betrachtet) sowie in beliebigen, jeweils am geeignetsten erscheinenden Formen, d. h. unprofiliert oder in Längsrichtung profiliert, ausgebildet sein können.Preferably, all of the sheets 5 are in the form of essentially transverse, i.e. H. essentially running in the direction of the roll longitudinal axis, sheet metal strips, which are basically in any length (viewed in the direction of the axial roll length) and in any, most appropriate forms, d. H. Unprofiled or profiled in the longitudinal direction can be formed.

Auch die radiale Höhe h dieser Bleche bzw. Blechstreifen 5 kann generell beliebig sein. Vorzugsweise wird diese radiale Höhe der in die Segmente 4 eingegossenen Blechstreifen 5 etwa einer vorgegebenen äußeren Verschleißschichtdicke des Walzenmantels 3 entsprechen, wie es in Fig. 1 bei zwei Segmenten 4 durch eine strichpunktierte Linie 6 angedeutet ist.The radial height h of these sheets or sheet strips 5 can generally be of any type. This radial height of the sheet metal strips 5 cast into the segments 4 will preferably correspond approximately to a predetermined outer wear layer thickness of the roll shell 3, as is indicated in FIG. 1 for two segments 4 by a dash-dotted line 6.

In Fig. 2 ist in einer perspektivischen Darstellung veranschaulicht, wie ein bzw. jedes Segment 4 des Walzenmantels 3 auf dem Walzengrundkörper 2 befestigt sein kann. Danach ist an der Außenumfangsseite des Walzengrundkörpers 2 eine entsprechend große Anzahl von ausreichend groß bemessenen, axial verlaufenden Nuten 7 vorgesehen, und an den beiden einander entgegengesetzten Stirnseiten 2a, 2b des Walzengrundkörpers 2 sind entsprechend profilierte Klemmplattensegmente 8 so angeordnet, daß sie die jeweils passend profilierten Innenumfangsseiten 4a des zugehörigen Mantelsegments 4 übergreifen. Zwei auf den beiden gegenüberliegenden Stirnseiten 2a, 2b des Walzengrundkörpers 2 sowie des jeweiligen Segments 4 angreifende Klemmplattensegmente 8 werden dann mit Hilfe von zwei an sich bekannten und daher nicht näher veranschaulichten, axial verlaufenden Spannschrauben fest zusammengespannt, so daß sie die Segmente mit dem Walzengrundkörper 2 fest verspannen.FIG. 2 shows a perspective illustration of how each or each segment 4 of the roll shell 3 is fastened on the roll base body 2 can be. Then a correspondingly large number of sufficiently large, axially extending grooves 7 are provided on the outer circumferential side of the roller base body 2, and correspondingly profiled clamping plate segments 8 are arranged on the two opposite end faces 2a, 2b of the roller base body in such a way that they each have the appropriate profile Grip over the inner circumferential sides 4a of the associated jacket segment 4. Two clamping plate segments 8 acting on the two opposite end faces 2a, 2b of the roller base body 2 and of the respective segment 4 are then firmly clamped together with the aid of two axially extending clamping screws which are known per se and are therefore not illustrated in detail, so that they clamp the segments with the roller base body 2 tight.

Eine andere Ausführungsmöglichkeit für die Befestigung der einzelnen Segmente 4 auf der Außenumfangsseite des Walzengrundkörpers 2 zeigt Fig. 3. Hiernach ist jedes Segment 4 mit zwei stirnseitigen, axial einander entgegengerichteten Befestigungsflanschen 4b und 4c ausgebildet, die auf der Außenumfangsseite 2c des Walzengrundkörpers 2 passend aufliegen und mit Hilfe von Schraubenbolzen 9 (links) oder mittels einteiliger Spannringe 11 (rechte Hälfte) auf dieser Außenumfangsseite 2c des Walzengrundkörpers 2 fest aufgespannt sind.
Fig. 4 zeigt darüberhinaus eine weitere Möglichkeit, wie der Walzengrundkörper 2 auf seiner Außenumfangsseite im Querschnitt gewissermaßen sägezahnförmig ausgeführt ist, wobei in jede sägezahnförmige Ausnehmung 10 die entsprechend profilierte Innenseite 4d des zugehörigen Segments 4 genau passend eingesetzt ist. Die Befestigung der Segmente 4 auf dem Walzengrundkörper 2 kann dabei in einer der beschriebenen Formen (mittels Spannschrauben oder Befestigungsschrauben) oder auch in jeder anderen geeigneten Weise erfolgen. Eine Profilierung der Außenumfangsseite des Walzengrundkörpers 2 und die dazu passende Profilierung der Innenseite jedes Segments 4 hat den Vorteil, daß der auf dem Walzengrundkörper fest verspannte Walzenmantel zuverlässig und drehfest auf diesem Walzengrundkörper festgelegt ist.Another embodiment of the attachment of the individual segments 4 on the outer circumferential side of the roller base body 2 is shown in FIG. 3. According to this, each segment 4 is formed with two front-side, axially opposing fastening flanges 4b and 4c, which fit on the outer circumferential side 2c of the roller base body 2 and with the aid of screw bolts 9 (left) or by means of one-piece clamping rings 11 (right half) on this outer circumferential side 2c of the roller base body 2.
FIG. 4 also shows a further possibility of how the roller base body 2 is, as it were, sawtooth-shaped in cross-section on its outer circumferential side, the correspondingly profiled inner side 4d of the associated segment 4 being inserted in a suitable manner in each sawtooth-shaped recess 10. The attachment of the segments 4 on the roller body 2 can be in one of the forms described (by means of clamping screws or fastening screws) or in any other suitable Way. Profiling the outer circumferential side of the roller base body 2 and the matching profile of the inside of each segment 4 has the advantage that the roller shell firmly clamped on the roller base body is reliably and non-rotatably fixed on this roller base body.

Wie bereits eingangs erwähnt worden ist, können die aus dem weicheren Material hergestellten Blechstreifen 5 sehr verschieden ausgeführt und auch im Gußwerkstoff der Segmente 4 eingegossen sein. Eine Reihe von Möglichkeiten hierfür läßt sich den Fig. 2 sowie 5 - 11 entnehmen.As has already been mentioned at the beginning, the sheet metal strips 5 made of the softer material can be made very differently and can also be cast in the cast material of the segments 4. A number of possibilities for this can be seen in FIGS. 2 and 5-11.

Gemäß Fig. 2 sind die Blechstreifen 5 als gerade verlaufende, flache (ebene) Blechstreifen ausgeführt, die sich parallel zur Walzenlängsachse 1a über die ganze axiale Länge (Arbeitslänge) L des Walzenmantels 3 erstrecken.2, the metal strips 5 are designed as straight, flat (flat) metal strips which extend parallel to the longitudinal axis 1 a of the roller over the entire axial length (working length) L of the roller shell 3.

Auch im Beispiel der Fig. 5 sind die im Segment 4 eingegossenen Blechstreifen 5a gerade und parallel zur Walzenlängsachse verlaufend ausgeführt. In diesem Falle erstrecken sich die Blechstreifen 5a jedoch nur jeweils über einen Teil der axialen Länge L des Walzenmantels, und zwar in der Form, daß in den die Blechstreifen 5a enthaltenden Umfangsabschnitten des Segments 4 in einem Umfangsabschnitt zwei solcher Blechstreifen 5a mit axialem Abstand voneinander in axialer Verlängerung hintereinanderliegen, während in den in Umfangsrichtung unmittelbar banachbarten Umfangsabschnitten jeweils nur ein solcher Blechsteifen 5a etwa im mittleren Längsabschnitt des Walzenmantels bzw. dessen Segments 4 angeordnet ist. In einander benachbarten Umfangsabschnitten liegen somit die Blechstreifen 5a etwa gestaffelt bzw. auf Lücke zueinander.Also in the example of FIG. 5, the sheet metal strips 5a cast in segment 4 are straight and run parallel to the longitudinal axis of the roll. In this case, however, the sheet metal strips 5a only extend over part of the axial length L of the roll shell, in such a way that in the peripheral sections of the segment 4 containing the sheet metal strips 5a, two such sheet metal strips 5a with an axial spacing from one another in a peripheral section Axial extension lie one behind the other, while in the peripheral sections immediately adjacent in the circumferential sections only one such sheet metal strip 5a is arranged approximately in the central longitudinal section of the roll shell or its segment 4. The sheet metal strips 5a are thus approximately staggered or in a gap with one another in adjacent circumferential sections.

Im Beispiel der Fig. 6 sind gleichartig ausgeführte und gleich große Blechstreifen 5a wie im vorhergehenden Beispiel (Fig. 5) vorgesehen, wobei diese Blechstreifen 5a jedoch in den einander benachbarten Umfangsabschnitten des Segments 4 jeweils parallel zueinander sowohl in Umfangsrichtung als auch in Richtung der Walzenlängsachse liegen, und wobei in jedem entsprechenden Umfangsabschnitt zwei solcher gerade verlaufender Blechstreifen 5a in axialer Verlängerung hintereinander angeordnet sind.In the example in FIG. 6, sheet metal strips 5a of the same type and of the same size as in the previous example (FIG. 5) are provided, but these sheet metal strips 5a are parallel to one another both in the circumferential direction and in the direction of the roll longitudinal axis in the adjacent circumferential sections of the segment 4 lie, and wherein in each corresponding circumferential section two such straight metal strips 5a are arranged one behind the other in axial extension.

Nach dem Beispiel der Fig. 7 sind in den einander benachbarten Umfangsabschnitten des Segments 4 wiederum jeweils mehrere in axialer Verlängerung und parallel zur Walzenlängsachse ausgerichtete gerade Blechstreifen 5b, jedoch von deutlich kürzerer Länge als in den vorhergehenden Beispielen vorgesehen. Darüberhinaus sind auch hier die jeweils ineinander unmittelbar benachbarten Umfangsabschnitten eingegossenen Blechstreifen 5b gestaffelt bzw. auf Lücke zueinander sowie derart angeordnet, daß die Blechstreifen 5c von jeweils mehreren einander benachbarten Umfangsabschnitten der einzelnen Segmente 4 eine relativ flache Pfeilform bilden.According to the example in FIG. 7, in each case a plurality of straight sheet metal strips 5b aligned in the axial extension and parallel to the longitudinal axis of the roll are provided in the adjacent circumferential sections of the segment 4, but of significantly shorter length than in the previous examples. In addition, the sheet metal strips 5b which are cast into one another directly adjacent peripheral sections are staggered or arranged in a gap with one another and arranged such that the sheet metal strips 5c of a plurality of adjacent peripheral sections of the individual segments 4 form a relatively flat arrow shape.

Fig. 8 zeigt ein weiteres Ausführungsbeispiel mit gerade verlaufenden, flach ausgeführten Blechstreifen 5c, deren Länge nur einem Teil der axialen Länge L der Segmente 4 bzw. des Walzenmantels entspricht. In jedem Blechstreifen 5c enthaltenden Umfangsabschnitt der Segmente 4 sind wiederum etwa in Richtung der Walzenlängsachse zwei solcher Blechstreifen 5c hintereinander angeordnet. In jedem dieser Umfangsabschnitte ist dabei jedoch der eine Blechstreifen 5c - in bezug auf die bei 1a strichpunktiert angedeutete Walzenlängsachse - in der einen Richtung und der zweite Blechstreifen 5c in der entgegengesetzten Richtung geneigt, d. h. die beiden axialen hinereinander angeordneten Blechstreifen 5c jedes entsprechenden Umfangsabschnittes sind etwa entgegengesetzt derart zueinander geneigt, daß sie - wie in Fig. 8 gezeigt - eine etwa flache Pfeilform bilden, wobei sich ihre einander benachbarten Enden berühren können oder - wie veranschaulicht - einen axialen Abstand zueinander aufweisen.Fig. 8 shows a further embodiment with straight, flat sheet metal strips 5c, the length of which corresponds only to a part of the axial length L of the segments 4 or the roll shell. In each circumferential section of the segments 4 containing sheet metal strips 5c, two such sheet metal strips 5c are in turn arranged approximately in the direction of the roll longitudinal axis. In each of these circumferential sections, however, there is one sheet metal strip 5c in one direction and the second sheet metal strip 5c in the opposite direction with respect to the longitudinal axis of the roll indicated by dash-dotted lines in FIG. 1a inclined, ie the two axially arranged sheet metal strips 5c of each corresponding circumferential section are inclined approximately opposite to each other in such a way that - as shown in FIG. 8 - they form an approximately flat arrow shape, with their adjacent ends touching or - as illustrated - one have an axial distance from each other.

Eine im Prinzip gleichartige Anordnung von zwei Blechstreifen 5d in jedem entsprechenden Umfangsabschnitt wie Fig. 8 zeigt auch das Beispiel der Fig. 9. In diesem Falle sind jedoch die in die einzelnen Segmente 4 eingegossenen Blechstreifen 5d jeweils so ausgeführt, daß sie in ihrer Längsrichtung eine gewellte Form aufweisen, bei ansonsten etwa gleicher flacher Pfeilform-Zusammenordnung wie es anhand der Fig. 8 zuvor erläutert worden ist.The example of FIG. 9 also shows an arrangement of two sheet metal strips 5d in principle in the same way as in FIG. 8, in this case. In this case, however, the sheet metal strips 5d cast into the individual segments 4 are each designed such that they have a lengthwise direction have a corrugated shape, with otherwise approximately the same flat arrow shape arrangement as was explained previously with reference to FIG. 8.

Fig. 10 veranschaulicht ferner ein Ausführungsbeispiel, bei dem die Blechstreifen 5e jedes Mantelsegments 4 zwar ebenfalls eine in ihrer Längsrichtung gewellte Form aufweisen, in jedem entsprechenden Umfangsabschnitt des Segments 4 jedoch nur ein einziger solcher gewellter Blechstreifen 5e angeordnet ist, der im wesentlichen in Richtung der Walzenlängsachse 1a verläuft und sich über den größten Teil der axialen Länge des Walzenmantels bzw. von dessen Segment 4 erstreckt.Fig. 10 further illustrates an embodiment in which the sheet metal strips 5e of each jacket segment 4 also have a corrugated shape in their longitudinal direction, but only a single such corrugated sheet metal strip 5e is arranged in each corresponding peripheral section of the segment 4, which is substantially in the direction of the Roll longitudinal axis 1a extends and extends over most of the axial length of the roll shell or from its segment 4.

Schließlich zeigt Fig. 11 noch ein Beispiel, nach dem die Blechstreifen 5f sich wiederum insgesamt etwa über den größten Teil der axialen Länge L des Walzenmantels 3 erstrecken und in Umfangsrichtung mit im wesentlichen gleichen Abständen zueinander angeordnet sind. Das Besondere dieser Ausführung ist darin zu sehen, daß alle gleichartig ausgeführten Blechstreifen 5f - wie in Fig. 11 dargestellt - eine flache Abwinklung, vorzugsweise eine symmetrische, etwa pfeilartige flache Winkelform aufweisen. Damit schließt jeder Blechstreifen 5f einen relativ stumpfen Winkel α ein (ähnlich wie auch etwa die jeweils axial hintereinanderliegenden Blechstreifen 5c in Fig. 8 bzw. 5d wie in Fig. 9). Die Scheitelpunkte 5f - jedes so gebildeten stumpfen Winkels liegen dabei etwa auf der axialen Längsmitte des Walzenmantels 3 und können je nach Einsatzfall in Drehrichtung oder entgegengesetzt zur Drehrichtung der zugehörigen Walze weisen.Finally, FIG. 11 shows another example, according to which the sheet metal strips 5f in turn extend over approximately the largest part of the axial length L of the roll shell 3 and are arranged in the circumferential direction at substantially equal distances from one another. The special feature of this design is the fact that all sheet metal strips are of the same design 5f - as shown in FIG. 11 - have a flat bend, preferably a symmetrical, approximately arrow-like flat angle shape. Each sheet metal strip 5f thus encloses a relatively obtuse angle α (similarly to the sheet strips 5c in FIG. 8 and 5d, respectively, which are axially one behind the other as in FIG. 9). The vertices 5f - of each obtuse angle thus formed lie approximately on the axial longitudinal center of the roll shell 3 and, depending on the application, can point in the direction of rotation or opposite to the direction of rotation of the associated roll.

Die erfindungsgemäß ausgeführte Mahlwalze ist besonders gut geeignet für eine Verwendung in einer Gutbettwalzenmühle der eingangs angedeuteten Art, so daß das zu zerkleinernde spröde Mahlgut besonders gut und gleichmäßig von den beiden in der Gutbettwalzenmühle angeordneten Mahlwalzen eingezogen werden kann.The grinding roller designed according to the invention is particularly well suited for use in a material bed roller mill of the type indicated at the outset, so that the brittle ground material to be comminuted can be drawn in particularly well and uniformly by the two grinding rollers arranged in the material bed roller mill.

Claims (13)

  1. Grinding roller, particularly for use in a material bed roller mill, in which brittle material for grinding is crushed between two grinding rollers which are pressed against one another with high pressure, comprising a basic roller body (2) and a roller shell (3) composed of individual segments (4), the segments being clamped to the basic roller body, characterised in that several sheets (5) which consist of a softer material than the cast material are cast into each segment (4) of the roller shell (3) which is made largely of hard cast material, the said sheets being arranged so as to be peripherally spaced from one another, running substantially at right angles to the shell surface (3a) and aligned approximately radially with respect thereto.
  2. Grinding roller as claimed in claim 1, characterised in that the sheets (5) are constructed in the form of sheet metal strips which run approximately transversely.
  3. Grinding roller as claimed in claim 2, characterised in that the sheet metal strips (5) extend over the entire axial length (L) of the roller shell (3).
  4. Grinding roller as claimed in claim 3, characterised in that the sheet metal strips (5a, 5b, 5c) in each case extend over only a part of the axial length (L) of the roller shell (3).
  5. Grinding roller as claimed in claim 4, characterised in that in the peripheral sections of the individual segments (4) containing the sheet metal strips (5a, 5b, 5c, 5d), in each case several sheet metal strips are arranged substantially behind one another in the direction of the longitudinal roller axis (1a).
  6. Grinding roller as claimed in claim 5, characterised in that the sheet metal strips (5a, 5b) of each corresponding peripheral section lie behind one another in straight axial extension.
  7. Grinding roller as claimed in claim 5, characterised in that the sheet metal strips (5a, 5b) of each corresponding peripheral section lie axially behind one another approximately in echelon formation.
  8. Grinding roller as claimed in claim 5, characterised in that the sheet metal strips (5c, 5d) of each corresponding peripheral section are inclined with respect to one another in approximately opposite directions - with respect to the longitudinal roller axis (1a) - and are arranged axially behind one another so that they form a flat arrow shape.
  9. Grinding roller as claimed in claim 2, characterised in that the sheet metal strips (5, 5a, 5b, 5c) are constructed so that they run straight and flat.
  10. Grinding roller as claimed in claim 2, characterised in that the sheet metal strips (5d, 5e) have an approximately corrugated shape in their longitudinal direction.
  11. Grinding roller as claimed in claim 1, characterised in that the sheet metal strips (5f) which extend at least over the greater part of the axial length (L) of the roller shell (3) and are arranged with substantially equal peripheral spacing between them have a flat bend, preferably a symmetrical, approximately arrow-shaped angular form.
  12. Grinding roller as claimed in claim 1, characterised in that the radial height (h) of the sheets (5) cast into the segments (4) corresponds approximately to a predetermined wear layer thickness of the roller shell (3).
  13. Grinding roller as claimed in claim 1, characterised in that the cast material of the segments (9) is a chill casting and the cast sheets (5) are produced from substantially non-hardenable steel, particularly structural steel.
EP90106145A 1989-05-10 1990-03-30 Crushing roll Expired - Lifetime EP0396897B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3915320 1989-05-10
DE3915320A DE3915320A1 (en) 1989-05-10 1989-05-10 GRINDING ROLLER

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EP0396897A2 EP0396897A2 (en) 1990-11-14
EP0396897A3 EP0396897A3 (en) 1991-03-20
EP0396897B1 true EP0396897B1 (en) 1993-06-02

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US (1) US5000392A (en)
EP (1) EP0396897B1 (en)
BR (1) BR9002136A (en)
DE (2) DE3915320A1 (en)
DK (1) DK0396897T3 (en)
ES (1) ES2041071T3 (en)
ZA (1) ZA902625B (en)

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DE3915320A1 (en) 1990-11-15
ZA902625B (en) 1990-12-28
ES2041071T3 (en) 1993-11-01
EP0396897A2 (en) 1990-11-14
EP0396897A3 (en) 1991-03-20
US5000392A (en) 1991-03-19
DK0396897T3 (en) 1993-08-09
DE59001599D1 (en) 1993-07-08
BR9002136A (en) 1991-08-13

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