EP3621742B1 - Roller mill and method for operating a roller mill - Google Patents

Roller mill and method for operating a roller mill Download PDF

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Publication number
EP3621742B1
EP3621742B1 EP18716235.9A EP18716235A EP3621742B1 EP 3621742 B1 EP3621742 B1 EP 3621742B1 EP 18716235 A EP18716235 A EP 18716235A EP 3621742 B1 EP3621742 B1 EP 3621742B1
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EP
European Patent Office
Prior art keywords
roller
mill
grinding
edge
scraper
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EP18716235.9A
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German (de)
French (fr)
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EP3621742A1 (en
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Frank Schroers
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FLSmidth AS
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FLSmidth AS
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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
    • B02C4/283—Lateral sealing shields
    • 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
    • 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
    • B02C4/40—Detachers, e.g. scrapers

Definitions

  • the invention relates to a roller mill with edge elements for comminuting granular material and a method for operating a roller mill.
  • Roller mills are usually used to crush grist, such as limestone, clinker or similar rocks.
  • grist such as limestone, clinker or similar rocks.
  • edge elements In order to influence the lateral outflow of ground material from a grinding gap formed between the grinding rollers of a roller mill in a controlled manner, it is known to arrange edge elements on one of the grinding rollers.
  • Such a roller mill with edge elements is, for example, from DE 20 2014 006 837 U1 known. An increased specific grinding pressure acts on the edge elements, which leads to a high load on the edge elements and thus often to wear or breakage of the edge elements.
  • WO2013/156586 A2 shows a roller mill with edge elements according to the preamble of claim 1.
  • a roller mill for comminuting granular material comprises a first grinding roller and a second grinding roller, which are arranged opposite one another and can be driven in opposite directions, with a grinding gap being formed between the grinding rollers.
  • At least one of the grinding rollers has an edge element on an end region of a grinding roller end, which is designed in such a way that it extends across the grinding gap and at least partially covers the opposite grinding roller at the front.
  • a scraper element for removing material is arranged on the end region of the end of the grinding roller that is provided with an edge element.
  • the scraper element is used in particular for at least partially removing material that has accumulated on the end region of the grinding roller.
  • the material is scraped off by the scraper element during operation of the roller mill, with the grinding rollers rotating in opposite directions.
  • the scraper element is preferably arranged on the end area of the grinding roller in such a way that it does not touch the grinding roller.
  • the end area of the grinding roller comprises, for example, the end face of the grinding roller, the surface of the grinding roller adjoining it, and an area surrounding the surface of the grinding roller, in which material is deposited.
  • such a region has a height of more than or equal to 1.5mm-3mm, in particular more than or equal to 2mm-5mm, preferably 4mm.
  • the edge element includes, in particular, an encircling circular ring, preferably a circular disk.
  • the edge element is attached to the end face of the respective grinding roller, for example screwed or welded.
  • an end gap is preferably formed in each case.
  • a gap at the end prevents the edge element from colliding with the end region of the respectively opposite grinding roller in the event of the grinding rollers running out of alignment, with the grinding rollers lying opposite one another not being arranged parallel to one another.
  • the grinding rollers include, in particular, a roller base body, with the edge element being detachably connected to the roller base body of the respective grinding roller.
  • the grinding roller preferably comprises a drive shaft for driving the grinding roller, on which the roller base body is arranged.
  • a detachable arrangement of the edge elements on the roller body offers the advantage of quick and easy replacement of the edge elements in the event of wear.
  • the edge elements are, for example, glued, soldered, welded or screwed onto the roller body and preferably have wear protection.
  • the wear protection is arranged on the inner surface of the edge element pointing in the direction of the milling gap.
  • Such wear protection includes, for example, a wear-resistant coating, such as build-up welding, wear-protection elements or wear-protection coatings.
  • the edge elements are preferably made of steel.
  • this wear protection layer is thicker on the end areas of the roll ends, which are provided with edge elements, than on the other areas of the grinding rolls. This leads to increased grinding pressure, which puts more stress on the edge elements and causes them to wear out or fail more often.
  • the material build-up on the edge elements at the ends of the grinding rollers is reliably prevented by means of the scraper elements. This minimizes the risk of increased wear and failure of the edge elements.
  • the scraper element is arranged in such a way that it removes material that has accumulated on the edge element and/or on the end region of the grinding roller during operation of the roller mill.
  • the scraper element is arranged to be stationary or movable relative to the rotatable grinding rollers, so that the grinding rollers rotate relative to the scraper element.
  • the scraper element is arranged at a distance from the edge element and/or the end region of the grinding roller.
  • the distance between the scraper element and the edge element and/or the end area of the grinding roller is preferably more than or equal to 1.5 mm-3 mm, in particular more than or equal to 2 mm.
  • a distance between the scraper element and the edge element and/or the end area of the grinding roller prevents the scraper element from coming into contact with the grinding roller and thus reduces wear on the scraper element.
  • the scraper element is arranged in such a way that the distance between the scraper element and the edge element and/or between the scraper element and the end region of the grinding roller can be adjusted.
  • the thickness of the material layer at the end areas of the grinding rollers should not exceed a specific value of, for example, 1-30 mm, in particular 2-25 mm, preferably 5-10 mm.
  • An adjustable distance ensures that when the scraper element wears, the distance between the scraper element and the edge element and/or the end area of the grinding roller is kept constant.
  • the service life of the wiper element is extended and replacement is not necessary in the event of wear.
  • the roller mill has a stationary machine frame and the scraper element is attached to the machine frame.
  • the machine frame includes, for example, a number of frame elements that are connected to bearing blocks of the grinding rollers, so that the grinding force acting on the grinding rollers is transmitted to the machine frame.
  • a machine frame of a roller mill comprises a frame element which extends essentially in the axial direction of the grinding rollers and to which the scraper element is preferably attached. The scraper element extends from the machine frame in the direction of the grinding roller, in particular in the end area of the grinding roller.
  • the roller mill has at least two stripper elements, which are arranged at end regions of different roller ends of the grinding roller.
  • the stripper elements are preferably arranged on opposite end areas of a grinding roller.
  • the scraper element has a scraper plate which is formed from a wear-resistant material such as tungsten carbide.
  • the stripper plate is arranged on the end of the stripper element facing the grinding roller and is in contact with the material to be stripped during operation of the roller mill. The stripper plate is therefore exposed to a high level of wear, with wear-resistant material extending the service life of the stripper plate.
  • the wiper element has an arm on which the wiper plate is detachably fastened.
  • the stripper plate is clamped or screwed to the arm.
  • the stripper plate preferably protrudes beyond the arm in the direction of the grinding roller.
  • each of the grinding rollers has an edge element at an end region of a roller end, which is designed such that it extends across the grinding gap and at least partially covers the opposite grinding roller at the front.
  • the edge elements are arranged diagonally opposite with respect to the end regions of the grinding rollers.
  • the wiper element extends along an edge element.
  • the wiper element extends in the radial direction Grinding roller, for example parallel or oblique to the edge element.
  • the distance between the edge element and the wiping element is preferably constant over the length of the wiping element.
  • the invention also relates to a method for operating a roller mill for comminuting granular material with a first grinding roller and a second grinding roller which are arranged opposite one another and can be driven in opposite directions, with a grinding gap being formed between the grinding rollers.
  • At least one of the grinding rollers has an edge element on an end region of a roller end, which is designed in such a way that it extends across the grinding gap and at least partially covers the opposite grinding roller at the front.
  • the method has at least the following step: removing material from an end area of a grinding roller. The material is preferably removed from the roller mill during operation of the roller mill with the grinding rollers rotating.
  • the material is removed by means of two scraper elements which are stationary relative to the grinding rollers.
  • the material is removed at two end areas each provided with an edge element.
  • FIG. 1 shows a roller mill 10 with a first grinding roller 12 and a second grinding roller 14, each of which has a substantially cylindrical roller body.
  • the grinding rollers 12, 14 are arranged opposite one another and can be driven in opposite directions.
  • a grinding gap 16 is formed between the grinding rollers 12, 14 and extends in the axial direction.
  • the grinding rollers 12, 14 are arranged almost parallel to one another, so that the grinding gap 16 extending between the grinding rollers 12, 14 has an almost constant width.
  • Each of the grinding rollers 12, 14 also has a drive shaft 30, 32 which extends through the respective grinding roller 12, 14 along the central axis and drives the grinding rollers to rotate about its central axis.
  • the first and the second grinding roller 12, 14 have the same diameter, the first grinding roller 12 being longer than the second grinding roller 14 can be.
  • the grinding rollers 12, 14 each have a first end region 24, 28 and a second end region 22, 26 which are arranged at opposite ends of the grinding roller.
  • the first end area 24 of the first grinding roller 12 is arranged opposite the first end area 28 of the second grinding roller 14 , the second end area 22 of the first grinding roller 12 being arranged opposite the second end area 26 of the second grinding roller 14 .
  • the first grinding roller 12 has two edge elements 18, 20 which are each attached to an end region of the grinding roller 12.
  • the first edge element 18 is attached to the first edge area 22 of the first grinding roller 12 and extends in the radial direction across the grinding gap 16 so that it partially covers the end face of the second grinding roller 14 at the first end area 26 .
  • the second edge element 20 is attached to the second end area 24 of the first grinding roller 12 and extends in the radial direction across the grinding gap 16 so that it partially covers the end face of the second grinding roller 14 over the second end area 28 .
  • a respective end face gap 34, 36 is formed between the edge elements 18 and the respective end face of the second grinding roller 14 a respective end face gap 34, 36 is formed.
  • the edge elements 18, 20 each comprise a circumferential circular ring, which can also consist of segments, for example, which is attached to the respective grinding roller 12, 14 in a manner that is not shown.
  • the edge elements 18, 20 are attached to the end face or to the outer circumference of the grinding roller, in particular the respective roller body.
  • the edge elements 18, 20 are made of a wear-resistant material, such as steel, and have a wear-resistant coating, in particular on the inside facing the milling gap 16.
  • the edge elements 18, 20 have a thickness of 10 mm to 100 mm, for example, and cover the opposite grinding rollers 12, 14 by about 2-20%, in particular 4-10%, preferably 3-6% of the roller diameter.
  • FIG. 2 shows a further embodiment of a grinding roller with edge elements 18, 20, wherein the grinding roller essentially corresponds to that in 1 shown grinding roller corresponds with the difference that in the embodiment of 2 each of the grinding rollers 12, 14 has a respective edge element 18, 20.
  • the first and the second grinding roller 12, 14 have the same diameter and the same length and are of essentially identical construction.
  • the edge elements 18, 20 are arranged diagonally opposite one another in relation to the end regions 22-28 of the grinding rollers 12, 14.
  • the first grinding roller 12 has at its first end area 24 an edge element 18 which extends in the radial direction over the grinding gap 16 and partially covers the end face of the second grinding roller 14 at the first end area 28 .
  • the second grinding roller 14 has at its second end area 26 an edge element 20 which extends in the radial direction over the grinding gap 16 and partially covers the end face of the first grinding roller 12 at its second edge area 22 .
  • the second edge element 20 is arranged on the diagonally opposite end region 26 of the second grinding roller 14 with respect to the first edge element 18 .
  • the grinding rollers 12, 14 are offset in the axial direction, so that a first end-side gap 34 is formed between the first edge element 18 and the end face of the second grinding roller 14, and a second end-side gap is formed between the second edge element 20 and the end face of the first grinding roller 12 36 is formed.
  • the first and the second end gap 34, 36 each extend in the radial direction.
  • FIG 3 shows a section of a first grinding roller 12 of the roller mill 10 according to FIG Fig.1 with a roller frame 40 on which the first and second grinding rollers 12, 14 are attached.
  • the Roller frame 38 has a support 40 which extends in the axial direction of the grinding roller 12 and is arranged at a distance therefrom.
  • Two stripper elements 42 , 44 are attached to the carrier 40 , each extending in the direction of a respective end region of the grinding roller 12 .
  • the scraper elements 42, 44 are arranged at a distance from the grinding roller 12 and the edge element 18, 20 of the grinding roller 12, so that the scraper does not touch the grinding roller 12 and the edge elements 18, 20.
  • the first scraper element 42 is attached to a region of the carrier 40 that is opposite the first end region 22 of the grinding roller 12, the first scraper element 42 extending in the radial direction of the grinding roller 12 along the first edge element 18 and being aligned essentially parallel to it. However, other orientations are also possible.
  • the second stripper element 44 is arranged in a corresponding manner on the second end area 24 and the second edge element 20 of the grinding roller 12 .
  • the wiper elements 42, 44 each extend along the inwardly facing surface of the edge elements 18, 20.
  • the wiper elements 4, 44 are, for example, of identical design.
  • FIG. 1 only shows the arrangement of the stripping elements 42, 44 on a roller mill according to FIG Fig.1 .
  • the roller mill 10 shown also has two stripper elements 42, 44.
  • Each grinding roller 12, 14 of the in 2 Roller mill 10 shown each has a scraper element 42, 44, which is attached, for example, to a respective carrier 40 of a roller frame 36 and corresponding to the embodiment of FIG 3 in the direction of a respective end region of the grinding roller 12, 14 having an edge element 18, 20.
  • FIG. 4 12 shows an enlarged view of an exemplary scraper element 42, 44.
  • the scraper element 42, 44 has a fastening plate 46 which, in the mounted position of the scraper element 42, 44, is attached to the carrier 40 of the roller frame 38.
  • the mounting plate has a plurality of mounting holes 48, which are used to attach the wiper element 42, 44 to the carrier 40, for example by means of screws.
  • An arm 50 is attached to the mounting plate 46 and extends, for example, at an angle of approximately 30-60°, in particular approximately 45°, to the mounting plate 46 in the direction of the grinding roller 12, 14 (not shown).
  • Attached to the arm 50 is a stripper plate 52 which is secured to the arm 50 by means of two screws 54 and a clamping plate 56 .
  • the stripper plate extends parallel to the arm 50 beyond that of the mounting plate 46 remote end of the arm addition, so that the stripper plate 52 on the arm 50 in the radial direction of the grinding roller 12, 14 protrudes.
  • the stripper plate 52 is clamped between the clamping plate 56 and the arm 50 so that it can be easily replaced if it becomes worn.
  • the stripper plate 58 is arranged in a clamping receptacle 58 which is arranged between the clamping plate 56 and the arm 50 and is clamped by means of the clamping plate 56 and the screws 54 .
  • the front edge of the stripper plate 52 extends in the embodiment of FIG 4 at an angle to the surface of the respective grinding roller 12, 14, so that the distance between the stripper plate 52 and the surface of the grinding roller 12, 14 is smaller in the direction of the grinding roller end.
  • the angle between the stripper plate 52 and the surface of the grinding roller 12, 14 is 45° - 135°, for example. It is also conceivable that the front edge of the stripper plate 52 extends essentially parallel to the surface of the respective grinding roller 12, 14, in particular in the axial direction direction of the grinding roller.
  • the side surface of the stripper plate 52 and the side surface of the arm 50 extend along the respective edge element 18, 20. In particular, between the stripper element 42, 44 and the surface of the grinding roller 12, 14 there is a gap of more than or equal to 1 mm, in particular more than or equal to 2 mm.
  • the mounting plate 46, arm, clamp seat 58 and clamp plate 56 are formed of steel, for example.
  • the stripper plate is formed, for example, from a highly wear-resistant material such as tungsten carbide.
  • figure 5 shows a rear view of the wiper element 42, 44 of 4 .
  • the arm 50 has a substantially U-shaped profile, with the clamping plate 56 and the clamping receptacle 58 being attached to the arm 50 by means of screws 54 and nuts.
  • the edge elements 18, 20 prevent material from escaping laterally from the grinding gap 16.
  • Autogenous wear protection is built up on the surface of the grinding rollers 12, 14 as a result of the deposition of material.
  • the scraper elements 42, 44 strip off material that has been deposited on the end areas of the grinding roller 12, 14 and thus ensure that the autogenous wear protection layer is also removed in the end areas of the grinding rollers 12, 14, to which the edge elements are attached , does not increase beyond a certain thickness, so that the edge elements are reliably protected against high pressure from deposited material.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)

Description

Die Erfindung betrifft eine Walzenmühle mit Randelementen zur Zerkleinerung von körnigem Material, sowie ein Verfahren zum Betreiben einer Walzenmühle.The invention relates to a roller mill with edge elements for comminuting granular material and a method for operating a roller mill.

Walzenmühlen werden üblicherweise zur Zerkleinerung von Mahlgut, wie beispielsweise Kalkstein, Klinker oder ähnliche Gesteine eingesetzt. Bei der Zerkleinerung von Mahlgut in einer Walzenmühle kommt es vor, dass Mahlgut seitlich aus dem Mahlspalt austritt, ohne den Mahlspalt vollständig oder überhaupt passiert zu haben. Dieses führt zur Senkung der Durchsatzleistung der Maschine und zur Erhöhung der Mahlkreisumläufe, was mit einem enormen Energieaufwand verbunden ist. Zur kontrollierten Beeinflussung des seitlichen Abfließens von Mahlgut aus einem zwischen den Mahlwalzen einer Walzenmühle ausgebildeten Mahlspalt ist es bekannt, Randelemente an einer der Mahlwalze anzuordnen. Eine solche Walzenmühle mit Randelementen ist beispielsweise aus der DE 20 2014 006 837 U1 bekannt. Auf die Randelemente wirkt ein erhöhter spezifischer Mahldruck, der zu einer starken Belastung der Randelemente und somit häufig zum Verschleiß oder Bruch der Randelemente führt. WO2013/156586 A2 zeigt eine Walzenmühle mit Randelementen gemäß dem Oberbegriff von Anspruch 1.Roller mills are usually used to crush grist, such as limestone, clinker or similar rocks. During the comminution of ground material in a roller mill, it can happen that ground material emerges laterally from the grinding gap without having passed through the grinding gap completely or at all. This leads to a reduction in the throughput of the machine and an increase in the grinding circuit circulation, which is associated with an enormous amount of energy. In order to influence the lateral outflow of ground material from a grinding gap formed between the grinding rollers of a roller mill in a controlled manner, it is known to arrange edge elements on one of the grinding rollers. Such a roller mill with edge elements is, for example, from DE 20 2014 006 837 U1 known. An increased specific grinding pressure acts on the edge elements, which leads to a high load on the edge elements and thus often to wear or breakage of the edge elements. WO2013/156586 A2 shows a roller mill with edge elements according to the preamble of claim 1.

Davon ausgehend ist es Aufgabe der vorliegenden Erfindung, eine Walzenmühle mit Randelementen bereitzustellen, wobei die Randelemente geringeren Belastungen und Verschleiß ausgesetzt sind.Proceeding from this, it is the object of the present invention to provide a roller mill with edge elements, the edge elements being subjected to lower loads and wear.

Diese Aufgabe wird erfindungsgemäß durch eine Vorrichtung mit den Merkmalen des unabhängigen Vorrichtungsanspruchs 1, sowie durch ein Verfahren mit den Merkmalen des unabhängigen Verfahrensanspruchs 10 gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den abhängigen Ansprüchen.According to the invention, this object is achieved by a device having the features of independent device claim 1 and by a method having the features of independent method claim 10 . Advantageous developments result from the dependent claims.

Eine Walzenmühle zum Zerkleinern von körnigem Material umfasst nach einem ersten Aspekt eine erste Mahlwalze und eine zweite Mahlwalze, die gegenüberliegend angeordnet und gegenläufig antreibbar sind, wobei zwischen den Mahlwalzen ein Mahlspalt ausgebildet ist. Zumindest eine der Mahlwalzen weist an einem Endbereich eines Mahlwalzenendes ein Randelement auf, das derart ausgebildet ist, dass es sich über den Mahlspalt erstreckt und die gegenüberliegende Mahlwalze stirnseitig zumindest teilweise überdeckt.According to a first aspect, a roller mill for comminuting granular material comprises a first grinding roller and a second grinding roller, which are arranged opposite one another and can be driven in opposite directions, with a grinding gap being formed between the grinding rollers. At least one of the grinding rollers has an edge element on an end region of a grinding roller end, which is designed in such a way that it extends across the grinding gap and at least partially covers the opposite grinding roller at the front.

An dem mit einem Randelement versehenen Endbereich des Mahlwalzenendes ist ein Abstreiferelement zum Entfernen von Material angeordnet. Das Abstreiferelement dient insbesondere zum zumindest teilweisen Entfernen von an dem Endbereich der Mahlwalze angelagertem Material. Das Material wird im Betrieb der Walzenmühle, wobei die Mahlwalzen gegenläufig rotieren, von dem Abstreiferelement abgestriffen. Das Abstreiferelement ist vorzugsweise derart an dem Endbereich der Mahlwalze angeordnet, dass es die Mahlwalze nicht berührt. Der Endbereich der Mahlwalze umfasst beispielsweise die Stirnseite der Mahlwalze, die daran angrenzende Mahlwalzenoberfläche, sowie einen die Mahlwalzenoberfläche umgebenden Bereich, in dem sich Material ablagert. Beispielsweise weist ein solcher Bereich eine Höhe von mehr als oder gleich 1,5mm - 3mm, insbesondere mehr als oder gleich 2mm - 5mm, vorzugsweise 4mm auf.A scraper element for removing material is arranged on the end region of the end of the grinding roller that is provided with an edge element. The scraper element is used in particular for at least partially removing material that has accumulated on the end region of the grinding roller. The material is scraped off by the scraper element during operation of the roller mill, with the grinding rollers rotating in opposite directions. The scraper element is preferably arranged on the end area of the grinding roller in such a way that it does not touch the grinding roller. The end area of the grinding roller comprises, for example, the end face of the grinding roller, the surface of the grinding roller adjoining it, and an area surrounding the surface of the grinding roller, in which material is deposited. For example, such a region has a height of more than or equal to 1.5mm-3mm, in particular more than or equal to 2mm-5mm, preferably 4mm.

Das Randelement umfasst insbesondere einen umlaufenden Kreisring, vorzugsweise eine Kreisscheibe. Insbesondere ist das Randelement an der Stirnseite der jeweiligen Mahlwalze angebracht, beispielsweise verschraubt oder verschweißt.The edge element includes, in particular, an encircling circular ring, preferably a circular disk. In particular, the edge element is attached to the end face of the respective grinding roller, for example screwed or welded.

Zwischen den Randelementen und der Stirnseite der jeweils gegenüberliegenden Mahlwalze ist vorzugsweise jeweils ein stirnseitiger Spalt ausgebildet. Ein stirnseitiger Spalt verhindert eine Kollision des Randelements mit dem Endbereich der jeweils gegenüberliegenden Mahlwalze in dem Fall eines Schieflaufs der Mahlwalzen, wobei die gegenüberliegenden Mahlwalzen nicht parallel zueinander angeordnet sind.Between the edge elements and the end face of the opposite grinding roller in each case, an end gap is preferably formed in each case. A gap at the end prevents the edge element from colliding with the end region of the respectively opposite grinding roller in the event of the grinding rollers running out of alignment, with the grinding rollers lying opposite one another not being arranged parallel to one another.

Die Mahlwalzen umfassen insbesondere einen Walzengrundkörper, wobei das Randelement lösbar mit dem Walzengrundkörper der jeweiligen Mahlwalze verbunden ist. Die Mahlwalze umfasst vorzugsweise eine Antriebswelle zum Antrieb der Mahlwalze, auf welcher der Walzengrundkörper angeordnet ist. Eine lösbare Anordnung der Randelemente auf dem Walzengrundkörper bietet den Vorteil eines schnellen und einfachen Austauschs der Randelemente im Verschleißfall. Die Randelemente werden beispielsweise auf den Walzengrundkörper geklebt, gelötet, geschweißt oder geschraubt und weisen vorzugsweise einen Verschleißschutz auf. Insbesondere ist der Verschleißschutz auf der in Richtung des Mahlspalts weisenden Innenfläche des Randelements angeordnet. Ein solcher Verschleißschutz umfasst beispielsweise eine verschleißfeste Beschichtung, wie Auftragsschweißung, Verschleißschutzelemente oder Verschleißschutzbeschichtungen. Vorzugsweise sind die Randelemente aus Stahl ausgebildet.The grinding rollers include, in particular, a roller base body, with the edge element being detachably connected to the roller base body of the respective grinding roller. The grinding roller preferably comprises a drive shaft for driving the grinding roller, on which the roller base body is arranged. A detachable arrangement of the edge elements on the roller body offers the advantage of quick and easy replacement of the edge elements in the event of wear. The edge elements are, for example, glued, soldered, welded or screwed onto the roller body and preferably have wear protection. In particular, the wear protection is arranged on the inner surface of the edge element pointing in the direction of the milling gap. Such wear protection includes, for example, a wear-resistant coating, such as build-up welding, wear-protection elements or wear-protection coatings. The edge elements are preferably made of steel.

Im Betrieb der Walzenmühle bildet sich üblicherweise eine Materialschicht auf der Oberfläche der Mahlwalzen, die einen autogegen Verschleißschutz der Walzenoberfläche bewirkt. Gemäß einer Erkenntnis der Erfinder ist diese Verschleißschutzschicht an den Endbereichen der Walzenenden, die mit Randelementen versehen sind, dicker als an den übrigen Bereichen der Mahlwalzen. Dies führt zu einem erhöhten Mahldruck, durch welchen die Randelemente stärker belastet werden und häufiger verschleißen oder versagen. Mittels der Abstreiferelemente wird der Materialaufbau an den Mahlwalzenenden an den Randelementen zuverlässig verhindert. Dadurch wird die Gefahr eines erhöhten Verschleißes und eines Versagens der Randelemente minimiert.When the roller mill is in operation, a layer of material usually forms on the surface of the grinding rollers, which protects the roller surface against wear and tear. According to one finding of the inventors, this wear protection layer is thicker on the end areas of the roll ends, which are provided with edge elements, than on the other areas of the grinding rolls. This leads to increased grinding pressure, which puts more stress on the edge elements and causes them to wear out or fail more often. The material build-up on the edge elements at the ends of the grinding rollers is reliably prevented by means of the scraper elements. This minimizes the risk of increased wear and failure of the edge elements.

Gemäß einer ersten Ausführungsform ist das Abstreiferelement derart angeordnet, dass es an dem Randelement und/ oder an dem Endbereich der Mahlwalze angelagertes Material im Betrieb der Walzenmühle entfernt. Insbesondere ist das Abstreiferelement relativ zu den rotierbaren Mahlwalzen stationär oder beweglich angeordnet, sodass die Mahlwalzen relativ zu dem Abstreiferelement rotieren.According to a first embodiment, the scraper element is arranged in such a way that it removes material that has accumulated on the edge element and/or on the end region of the grinding roller during operation of the roller mill. In particular, the scraper element is arranged to be stationary or movable relative to the rotatable grinding rollers, so that the grinding rollers rotate relative to the scraper element.

Gemäß einer weiteren Ausführungsform ist das Abstreiferelement zu dem Randelement und/ oder dem Endbereich der Mahlwalze beabstandet angeordnet. Vorzugsweise weist der Abstand zwischen dem Abstreiferelement und dem Randelement und/ oder dem Endbereich der Mahlwalze mehr als oder gleich 1,5mm - 3mm, insbesondere mehr als oder gleich 2mm auf. Ein Abstand zwischen dem Abstreiferelement und dem Randelement und/ oder dem Endbereich der Mahlwalze verhindert einen Kontakt des Abstreiferelements mit der Mahlwalze und vermindert somit der Verschleiß des Abstreiferelements.According to a further embodiment, the scraper element is arranged at a distance from the edge element and/or the end region of the grinding roller. The distance between the scraper element and the edge element and/or the end area of the grinding roller is preferably more than or equal to 1.5 mm-3 mm, in particular more than or equal to 2 mm. A distance between the scraper element and the edge element and/or the end area of the grinding roller prevents the scraper element from coming into contact with the grinding roller and thus reduces wear on the scraper element.

Das Abstreiferelement ist gemäß einer weiteren Ausführungsform derart angeordnet, dass der Abstand zwischen dem Abstreiferelement und dem Randelement und/ oder zwischen dem Abstreiferelement und dem Endbereich der Mahlwalze einstellbar ist. Insbesondere soll die Dicke der Materialschicht an den Endbereichen der Mahlwalzen einen bestimmten Wert von beispielsweise 1-30mm, insbesondere 2-25mm, vorzugsweise 5-10mm nicht überschreiten. Ein einstellbarer Abstand stellt sicher, dass bei einem Verschleiß des Abstreiferelements der Abstand zwischen dem Abstreiferelement und dem Randelement und/ oder dem Endbereich der Mahlwalze konstant gehalten wird. Zusätzlich wird die Lebensdauer des Abstreiferelements verlängert und ein Austausch ist im Verschleißfall nicht notwendig.According to a further embodiment, the scraper element is arranged in such a way that the distance between the scraper element and the edge element and/or between the scraper element and the end region of the grinding roller can be adjusted. In particular, the thickness of the material layer at the end areas of the grinding rollers should not exceed a specific value of, for example, 1-30 mm, in particular 2-25 mm, preferably 5-10 mm. An adjustable distance ensures that when the scraper element wears, the distance between the scraper element and the edge element and/or the end area of the grinding roller is kept constant. In addition, the service life of the wiper element is extended and replacement is not necessary in the event of wear.

Gemäß einer weiteren Ausführungsform weist die Walzenmühle einen stationären Maschinenrahmen auf und das Abstreiferelement ist an dem Maschinenrahmen angebracht. Der Maschinenrahmen umfasst beispielsweise mehrere Rahmenelemente, die mit Lagersteinen der Mahlwalzen verbunden sind, sodass die auf die Mahlwalzen wirkende Mahlkraft auf den Maschinenrahmen übertragen wird. Insbesondere umfasst ein Maschinenrahmen einer Walzenmühle ein sich im Wesentlichen in axialer Richtung der Mahlwalzen erstreckendes Rahmenelement, an dem vorzugsweise das Abstreiferelement angebracht ist. Das Abstreiferelement erstreckt sich von dem Maschinenrahmen in Richtung der Mahlwalze, insbesondere in dem Endbereich der Mahlwalze.According to a further embodiment, the roller mill has a stationary machine frame and the scraper element is attached to the machine frame. the The machine frame includes, for example, a number of frame elements that are connected to bearing blocks of the grinding rollers, so that the grinding force acting on the grinding rollers is transmitted to the machine frame. In particular, a machine frame of a roller mill comprises a frame element which extends essentially in the axial direction of the grinding rollers and to which the scraper element is preferably attached. The scraper element extends from the machine frame in the direction of the grinding roller, in particular in the end area of the grinding roller.

Die Walzenmühle weist zumindest zwei Abstreiferelemente auf, die an Endbereichen unterschiedlicher Walzenenden der Mahlwalze angeordnet sind. Die Abstreiferelemente sind vorzugweise an gegenüberliegenden Endbereichen einer Mahlwalze angeordnet.The roller mill has at least two stripper elements, which are arranged at end regions of different roller ends of the grinding roller. The stripper elements are preferably arranged on opposite end areas of a grinding roller.

Gemäß einer weiteren Ausführungsform weist das Abstreiferelement eine Abstreifplatte auf, die aus einem verschleißfesten Material, wie beispielsweise Wolframcarbid ausgebildet ist. Die Abstreifplatte ist an dem der Mahlwalze zugewandten Ende des Abstreiferelements angeordnet und ist im Betrieb der Walzenmühle mit dem abzustreifenden Material in Kontakt. Die Abtreifplatte ist daher einem hohen Verschleiß ausgesetzt, wobei ein verschleißfestes Material die Lebensdauer der Abstreifplatte verlängert.According to a further embodiment, the scraper element has a scraper plate which is formed from a wear-resistant material such as tungsten carbide. The stripper plate is arranged on the end of the stripper element facing the grinding roller and is in contact with the material to be stripped during operation of the roller mill. The stripper plate is therefore exposed to a high level of wear, with wear-resistant material extending the service life of the stripper plate.

Das Abstreiferelement weist gemäß einer weiteren Ausführungsform einen Arm auf, an dem die Abstreifplatte lösbar befestigt ist. Beispielsweise ist die Abstreifplatte an dem Arm verklemmt, oder verschraubt. Die Abstreifplatte steht vorzugsweise in Richtung der Mahlwalze über den Arm hervor. Eine lösbare Befestigung der Abstreifplatte des Abstreiferelements ermöglicht ein einfaches Austauschen der Abstreifplatte, die den verschleißintensivsten Bereich des Abstreiferelements darstellt. Ein Austausch des gesamten Abstreiferelements im Verschleißfall ist somit nicht notwendig.According to a further embodiment, the wiper element has an arm on which the wiper plate is detachably fastened. For example, the stripper plate is clamped or screwed to the arm. The stripper plate preferably protrudes beyond the arm in the direction of the grinding roller. A detachable fastening of the stripper plate of the stripper element enables easy replacement of the stripper plate, which represents the most wear-intensive area of the stripper element. It is therefore not necessary to replace the entire wiper element in the event of wear.

Gemäß einer weiteren Ausführungsform weist jede der Mahlwalzen an einem Endbereich eines Walzenendes jeweils ein Randelement auf, das derart ausgebildet ist, dass es sich über den Mahlspalt erstreckt und die gegenüberliegende Mahlwalze stirnseitig zumindest teilweise überdeckt. Insbesondere sind die Randelemente mit Bezug auf die Endbereiche der Mahlwalzen diagonal gegenüberliegend angeordnet.According to a further embodiment, each of the grinding rollers has an edge element at an end region of a roller end, which is designed such that it extends across the grinding gap and at least partially covers the opposite grinding roller at the front. In particular, the edge elements are arranged diagonally opposite with respect to the end regions of the grinding rollers.

Das Abstreiferelement erstreckt sich gemäß einer weiteren Ausführungsform entlang eines Randelements. Insbesondere erstreckt sich das Abstreiferelement in radialer Richtung der Mahlwalze, beispielsweise parallel oder schräg zu dem Randelement. Der Abstand zwischen dem Randelement und dem Abtreifelement ist vorzugweise über die Länge des Abstreiferelements konstant.According to a further embodiment, the wiper element extends along an edge element. In particular, the wiper element extends in the radial direction Grinding roller, for example parallel or oblique to the edge element. The distance between the edge element and the wiping element is preferably constant over the length of the wiping element.

Die Erfindung betrifft des Weiteren ein Verfahren zum Betreiben einer Walzenmühle zum Zerkleinern von körnigem Material mit einer ersten Mahlwalze und einer zweiten Mahlwalze, die gegenüberliegend angeordnet und gegenläufig antreibbar sind, wobei zwischen den Mahlwalzen ein Mahlspalt ausgebildet ist. Zumindest eine der Mahlwalzen weist an einem Endbereich eines Walzenendes ein Randelement auf, das derart ausgebildet ist, dass es sich über den Mahlspalt erstreckt und die gegenüberliegende Mahlwalze stirnseitig zumindest teilweise überdeckt. Das Verfahren weist zumindest den Schritt auf: Entfernen von Material aus einem Endbereich einer Mahlwalze. Das Material wird vorzugsweise im Betrieb der Walzenmühle bei rotierenden Mahlwalzen von der Walzenmühle entfernt.The invention also relates to a method for operating a roller mill for comminuting granular material with a first grinding roller and a second grinding roller which are arranged opposite one another and can be driven in opposite directions, with a grinding gap being formed between the grinding rollers. At least one of the grinding rollers has an edge element on an end region of a roller end, which is designed in such a way that it extends across the grinding gap and at least partially covers the opposite grinding roller at the front. The method has at least the following step: removing material from an end area of a grinding roller. The material is preferably removed from the roller mill during operation of the roller mill with the grinding rollers rotating.

Die mit Bezug auf die Mahlwalze beschriebenen Vorteile treffen in verfahrensmäßiger Entsprechung auf das Verfahren m Betreiben einer Walzenmühle zum Zerkleinern von körnigem Material zu.The advantages described with reference to the grinding roller apply in a procedural correspondence to the method m operating a roller mill for comminuting granular material.

Gemäß einer Ausführungsform wird das Material mittels zwei relativ zu den Mahlwalzen stationären Abstreiferelemente entfernt. Das Material wird an zwei mit jeweils einem Randelement versehenen Endbereichen entfernt.According to one embodiment, the material is removed by means of two scraper elements which are stationary relative to the grinding rollers. The material is removed at two end areas each provided with an edge element.

Beschreibung der ZeichnungenDescription of the drawings

Die Erfindung ist nachfolgend anhand mehrerer Ausführungsbeispiele mit Bezug auf die beiliegenden Figuren näher erläutert.

Fig. 1
zeigt eine schematische Darstellung eines Ausschnitts einer Walzenmühle in einer Draufsicht gemäß einem Ausführungsbeispiel.
Fig. 2
zeigt eine schematische Darstellung eines Ausschnitts einer Walzenmühle in einer Draufsicht gemäß einem weiteren Ausführungsbeispiel.
Fig. 3
zeigt eine schematische Darstellung eines Ausschnitts einer Mahlwalze mit Abstreiferelementen in einer perspektivischen Absicht gemäß einem Ausführungsbeispiel.
Fig. 4
zeigt eine schematische Darstellung eines Abstreiferelements in einer perspektivischen Ansicht gemäß eines Ausführungsbeispiels.
Fig. 5
zeigt eine schematische Darstellung des Abstreiferelements der Fig. 4 in einer perspektivischen Rückansicht.
The invention is explained in more detail below on the basis of several exemplary embodiments with reference to the attached figures.
1
shows a schematic representation of a section of a roller mill in a plan view according to an embodiment.
2
shows a schematic representation of a section of a roller mill in a plan view according to a further embodiment.
3
shows a schematic representation of a section of a grinding roller with scraper elements in a perspective intention according to an embodiment.
4
shows a schematic representation of a wiper element in a perspective view according to an embodiment.
figure 5
shows a schematic representation of the wiper element 4 in a perspective rear view.

Fig. 1 zeigt eine Walzenmühle 10 mit einer ersten Mahlwalze 12 und einer zweiten Mahlwalze 14, die jeweils einen im Wesentlichen zylinderförmigen Walzengrundkörper aufweisen. Die Mahlwalzen 12, 14 sind gegenüberliegend angeordnet und gegenläufig antreibbar. Zwischen den Mahlwalzen 12, 14 ist ein Mahlspalt 16 ausgebildet, der sich in axialer Richtung erstreckt. Die Mahlwalzen 12, 14 sind nahezu parallel zueinander angeordnet, sodass der sich zwischen den Mahlwalzen 12, 14 erstreckende Mahlspalt 16 eine nahezu konstante Breite aufweist. Jeder der Mahlwalzen 12, 14 weist ferner eine Antriebswelle 30, 32 auf, die sich entlang der Mittelachse durch die jeweilige Mahlwalze 12, 14 erstreckt und die Mahlwalzen um ihre Mittelachse rotierend antreibt. Die erste und die zweite Mahlwalze 12, 14 weisen den gleichen Durchmesser auf, wobei die erste Mahlwalze 12 länger ist als die zweit Mahlwalze 14 sein kann. 1 shows a roller mill 10 with a first grinding roller 12 and a second grinding roller 14, each of which has a substantially cylindrical roller body. The grinding rollers 12, 14 are arranged opposite one another and can be driven in opposite directions. A grinding gap 16 is formed between the grinding rollers 12, 14 and extends in the axial direction. The grinding rollers 12, 14 are arranged almost parallel to one another, so that the grinding gap 16 extending between the grinding rollers 12, 14 has an almost constant width. Each of the grinding rollers 12, 14 also has a drive shaft 30, 32 which extends through the respective grinding roller 12, 14 along the central axis and drives the grinding rollers to rotate about its central axis. The first and the second grinding roller 12, 14 have the same diameter, the first grinding roller 12 being longer than the second grinding roller 14 can be.

Die Mahlwalzen 12, 14 weisen jeweils einen ersten Endbereich 24, 28 und einen zweiten Endbereich 22, 26 auf, die an gegenüberliegenden Enden der Mahlwalze angeordnet sind. Der erste Endbereich 24 der ersten Mahlwalze 12 ist gegenüberliegend des ersten Endbereichs 28 der zweiten Mahlwalze 14 angeordnet, wobei der zweite Endbereich 22 der ersten Mahlwalze 12 gegenüberliegend des zweiten Endbereichs 26 der zweiten Mahlwalze 14 angeordnet ist.The grinding rollers 12, 14 each have a first end region 24, 28 and a second end region 22, 26 which are arranged at opposite ends of the grinding roller. The first end area 24 of the first grinding roller 12 is arranged opposite the first end area 28 of the second grinding roller 14 , the second end area 22 of the first grinding roller 12 being arranged opposite the second end area 26 of the second grinding roller 14 .

Die erste Mahlwalze 12 weist zwei Randelemente 18, 20 auf, die jeweils an einem Endbereich der Mahlwalze 12 angebracht sind. Das erste Randelement 18 ist an dem ersten Randbereich 22 der ersten Mahlwalze 12 angebracht und erstreckt sich in radialer Richtung über den Mahlspalt 16 hinweg, sodass es die Stirnseite der zweiten Mahlwalze 14 an dem ersten Endbereich 26 teilweise überdeckt. Das zweite Randelement 20 ist an dem zweiten Endbereich 24 der ersten Mahlwalze 12 angebracht und erstreckt sich in radialer Richtung über den Mahlspalt 16 hinweg, sodass es die Stirnseite der zweiten Mahlwalze 14 dem zweiten Endbereich 28 teilweise überdeckt. Zwischen den Randelementen 18 und der jeweiligen Stirnseite der zweiten Mahlwalze 14 ist jeweils ein stirnseitiger Spalt 34, 36 ausgebildet.The first grinding roller 12 has two edge elements 18, 20 which are each attached to an end region of the grinding roller 12. The first edge element 18 is attached to the first edge area 22 of the first grinding roller 12 and extends in the radial direction across the grinding gap 16 so that it partially covers the end face of the second grinding roller 14 at the first end area 26 . The second edge element 20 is attached to the second end area 24 of the first grinding roller 12 and extends in the radial direction across the grinding gap 16 so that it partially covers the end face of the second grinding roller 14 over the second end area 28 . Between the edge elements 18 and the respective end face of the second grinding roller 14 a respective end face gap 34, 36 is formed.

Die Randelemente 18, 20 umfassen jeweils einen umlaufenden Kreisring, der beispielweise auch aus Segmenten bestehen kann der auf nicht dargestellte Weise an der jeweiligen Mahlwalze 12, 14 angebracht ist. Beispielsweise sind die Randelemente 18, 20 an der Stirnseite oder auf dem äußeren Umfang der Mahlwalze, insbesondere dem jeweiligen Walzengrundkörper, angebracht. Auf dem äußeren Umfang der jeweiligen Mahlwalze 12, 14 ist beispielsweise eine umlaufende Nut angeordnet, in der jeweils ein Randelement 18, 20 angeordnet ist. Die Randelemente 18, 20 sind aus einem verschleißfesten Material, wie beispielsweise Stahl, ausgebildet und weisen insbesondere auf der zu dem Mahlspalt 16 weisenden Innenseite eine verschleißfeste Beschichtung auf. Die Randelemente 18, 20 weisen beispielsweise eine Dicke von 10 mm bis 100 mm und überdecken die gegenüberliegenden Mahlwalzen 12, 14 um etwa 2-20%, insbesondere 4-10%, vorzugsweise 3-6% des Walzendurchmessers.The edge elements 18, 20 each comprise a circumferential circular ring, which can also consist of segments, for example, which is attached to the respective grinding roller 12, 14 in a manner that is not shown. For example, the edge elements 18, 20 are attached to the end face or to the outer circumference of the grinding roller, in particular the respective roller body. On the outer circumference of the respective grinding roller 12, 14, for example, a circumferential groove is arranged, in which a respective edge element 18, 20 is arranged. The edge elements 18, 20 are made of a wear-resistant material, such as steel, and have a wear-resistant coating, in particular on the inside facing the milling gap 16. The edge elements 18, 20 have a thickness of 10 mm to 100 mm, for example, and cover the opposite grinding rollers 12, 14 by about 2-20%, in particular 4-10%, preferably 3-6% of the roller diameter.

Fig. 2 zeigt eine weitere Ausführungsform einer Mahlwalze mit Randelementen 18, 20, wobei die Mahlwalze im Wesentlichen der in Fig. 1 dargestellten Mahlwalze entspricht mit dem Unterschied, dass in dem Ausführungsbeispiel der Fig. 2 jede der Mahlwalzen 12, 14 jeweils ein Randelement 18, 20 aufweist. Die erste und die zweite Mahlwalze 12, 14 weisen den gleichen Durchmesser und die gleich Länge auf und sind im Wesentlichen baugleich ausgebildet. 2 shows a further embodiment of a grinding roller with edge elements 18, 20, wherein the grinding roller essentially corresponds to that in 1 shown grinding roller corresponds with the difference that in the embodiment of 2 each of the grinding rollers 12, 14 has a respective edge element 18, 20. The first and the second grinding roller 12, 14 have the same diameter and the same length and are of essentially identical construction.

Die Randelemente 18, 20 sind bezogen auf die Endbereiche 22 -28 der Mahlwalzen 12, 14 diagonal gegenüberliegend angeordnet. Die erste Mahlwalze 12 weist an ihrem ersten Endbereich 24 ein Randelement 18 auf, das sich in radialer Richtung über den Mahlspalt 16 erstreckt und die Stirnseite der zweiten Mahlwalze 14 an dem ersten Endbereich 28 teilweise überdeckt. Die zweite Mahlwalze 14 weist an ihrem zweiten Endbereich 26 ein Randelement 20 auf, das sich in radialer Richtung über den Mahlspalt 16 erstreckt und die Stirnseite der ersten Mahlwalze 12 an ihrem zweiten Randbereich 22 teilweise überdeckt. Das zweite Randelement 20 ist mit Bezug auf das erste Randelement 18 an dem diagonal gegenüberliegenden Endbereich 26 der zweiten Mahlwalze 14 angeordnet. Die Mahlwalzen 12, 14 sind in axialer Richtung versetzt angeordnet, sodass zwischen dem ersten Randelement 18 und der Stirnseite der zweiten Mahlwalze 14 ist ein erster stirnseitiger Spalt 34 ausgebildet ist und zwischen dem zweiten Randelement 20 und der Stirnseite der ersten Mahlwalze 12 ein zweiter Stirnseitiger Spalt 36 ausgebildet ist. Der erste und der zweite stirnseitige Spalt 34, 36 erstrecken sich jeweils in radialer Richtung.The edge elements 18, 20 are arranged diagonally opposite one another in relation to the end regions 22-28 of the grinding rollers 12, 14. The first grinding roller 12 has at its first end area 24 an edge element 18 which extends in the radial direction over the grinding gap 16 and partially covers the end face of the second grinding roller 14 at the first end area 28 . The second grinding roller 14 has at its second end area 26 an edge element 20 which extends in the radial direction over the grinding gap 16 and partially covers the end face of the first grinding roller 12 at its second edge area 22 . The second edge element 20 is arranged on the diagonally opposite end region 26 of the second grinding roller 14 with respect to the first edge element 18 . The grinding rollers 12, 14 are offset in the axial direction, so that a first end-side gap 34 is formed between the first edge element 18 and the end face of the second grinding roller 14, and a second end-side gap is formed between the second edge element 20 and the end face of the first grinding roller 12 36 is formed. The first and the second end gap 34, 36 each extend in the radial direction.

Fig. 3 zeigt einen Ausschnitt einer ersten Mahlwalze 12 der Walzenmühle 10 gemäß Fig.1 mit einem Walzenrahmen 40, an dem die erste und die zweite Mahlwalze 12, 14 angebracht sind. Der Walzenrahmen 38 weist einen Träger 40 auf, der sich in axialer Richtung der Mahlwalze 12 erstreckt und in einem Abstand zu dieser angeordnet ist. 3 shows a section of a first grinding roller 12 of the roller mill 10 according to FIG Fig.1 with a roller frame 40 on which the first and second grinding rollers 12, 14 are attached. the Roller frame 38 has a support 40 which extends in the axial direction of the grinding roller 12 and is arranged at a distance therefrom.

An dem Träger 40 sind beispielhaft zwei Abstreiferelemente 42, 44 angebracht, die sich jeweils in Richtung eines jeweiligen Endbereichs der Mahlwalze 12 erstrecken. Die Abstreiferelemente 42, 44 sind zu der Mahlwalze 12 und dem Randelement 18, 20 der Mahlwalze 12 beabstandet angeordnet, sodass die Abstreifer die Mahlwalze 12 und die Randelemente 18, 20 nicht berühren. Das erste Abstreiferelement 42 ist an einem Bereich des Trägers 40 angebracht, der dem ersten Endbereich 22 der Mahlwalze 12 gegenüberliegt, wobei sich das erste Abstreiferelement 42 in radialer Richtung der Mahlwalze 12 entlang des ersten Randelements 18 erstreckt und im Wesentlichen parallel zu diesem ausgerichtet ist. Es sind jedoch auch andere Ausrichtungen möglich. Das zweite Abstreiferelement 44 ist in entsprechender Weise an dem zweiten Endbereich 24 und dem zweiten Randelement 20 der Mahlwalze 12 angeordnet. Die Abstreiferelemente 42, 44 erstrecken sich jeweils entlang an der nach Innen weisenden Fläche der Randelemente 18, 20. Die Abstreiferelemente 4, 44 sind beispielsweise identisch ausgebildet.Two stripper elements 42 , 44 are attached to the carrier 40 , each extending in the direction of a respective end region of the grinding roller 12 . The scraper elements 42, 44 are arranged at a distance from the grinding roller 12 and the edge element 18, 20 of the grinding roller 12, so that the scraper does not touch the grinding roller 12 and the edge elements 18, 20. The first scraper element 42 is attached to a region of the carrier 40 that is opposite the first end region 22 of the grinding roller 12, the first scraper element 42 extending in the radial direction of the grinding roller 12 along the first edge element 18 and being aligned essentially parallel to it. However, other orientations are also possible. The second stripper element 44 is arranged in a corresponding manner on the second end area 24 and the second edge element 20 of the grinding roller 12 . The wiper elements 42, 44 each extend along the inwardly facing surface of the edge elements 18, 20. The wiper elements 4, 44 are, for example, of identical design.

Fig. 3 zeigt lediglich die Anordnung der Abtreifelemente 42, 44 an einer Walzenmühle gemäß Fig.1. Eine in Fig. 2 dargestellte Walzenmühle 10 weist ebenfalls zwei Abstreiferelemente 42, 44 auf. Jede Mahlwalze 12, 14 der in Fig. 2 dargestellten Walzenmühle 10 weist jeweils ein Abstreiferelement 42, 44 auf, das beispielsweise an einem jeweiligen Träger 40 eines Walzenrahmens 36 angebracht ist und sich entsprechend dem Ausführungsbeispiel der Fig. 3 in Richtung eines jeweiligen ein Randelement 18, 20 aufweisenden Endbereichs der Mahlwalze 12, 14 erstrecket. 3 FIG. 1 only shows the arrangement of the stripping elements 42, 44 on a roller mill according to FIG Fig.1 . one inside 2 The roller mill 10 shown also has two stripper elements 42, 44. Each grinding roller 12, 14 of the in 2 Roller mill 10 shown each has a scraper element 42, 44, which is attached, for example, to a respective carrier 40 of a roller frame 36 and corresponding to the embodiment of FIG 3 in the direction of a respective end region of the grinding roller 12, 14 having an edge element 18, 20.

Fig. 4 zeigt eine vergrößerte Ansicht eines beispielhaften Abstreiferelements 42, 44. Das Abstreiferelement 42, 44 weist eine Befestigungsplatte 46 auf, die in der montierten Position des Abstreiferelements 42, 44 an dem Träger 40 des Walzenrahmes 38 an. Die Befestigungsplatte weist eine Mehrzahl von Befestigungslöchern 48 auf, die der Befestigung des Abstreiferelements 42, 44 an dem Träger 40 beispielsweise mittels Schrauben dienen. 4 12 shows an enlarged view of an exemplary scraper element 42, 44. The scraper element 42, 44 has a fastening plate 46 which, in the mounted position of the scraper element 42, 44, is attached to the carrier 40 of the roller frame 38. The mounting plate has a plurality of mounting holes 48, which are used to attach the wiper element 42, 44 to the carrier 40, for example by means of screws.

An der Befestigungsplatte 46 ist ein Arm 50 angebracht, der sich beispielsweise in einem Winkel von etwa 30-60°, insbesondere etwa 45° zu der Befestigungsplatte 46 in Richtung der nicht dargestellten Mahlwalze 12, 14 erstreckt. An dem Arm 50 ist eine Abstreifplatte 52 angebracht, die mittels zwei Schrauben 54 und einer Klemmplatte 56 an dem Arm 50 befestigt ist. Die Abstreifplatte erstreckt sich parallel zu dem Arm 50 über das der Befestigungsplatte 46 abgewandte Ende des Arms hinaus, sodass die Abstreifplatte 52 an dem Arm 50 in radialer Richtung der Mahlwalze 12, 14 hervorsteht. Die Abstreifplatte 52 ist zwischen der Klemmplatte 56 und dem Arm 50 verklemmt, sodass diese in einem Verschleißfall einfach austauschbar ist. Beispielhaft ist die Abstreifplatte 58 in einer Klemmaufnahme 58 angeordnet, die zwischen der Klemmplatte 56 und dem Arm 50 angeordnet und mittels der Klemmplatte 56 und den Schrauben 54 verklammt ist.An arm 50 is attached to the mounting plate 46 and extends, for example, at an angle of approximately 30-60°, in particular approximately 45°, to the mounting plate 46 in the direction of the grinding roller 12, 14 (not shown). Attached to the arm 50 is a stripper plate 52 which is secured to the arm 50 by means of two screws 54 and a clamping plate 56 . The stripper plate extends parallel to the arm 50 beyond that of the mounting plate 46 remote end of the arm addition, so that the stripper plate 52 on the arm 50 in the radial direction of the grinding roller 12, 14 protrudes. The stripper plate 52 is clamped between the clamping plate 56 and the arm 50 so that it can be easily replaced if it becomes worn. By way of example, the stripper plate 58 is arranged in a clamping receptacle 58 which is arranged between the clamping plate 56 and the arm 50 and is clamped by means of the clamping plate 56 and the screws 54 .

Die Vorderkante der Abstreifplatte 52 erstreckt sich in dem Ausführungsbeispiel der Fig. 4 in einem Winkel zu Oberfläche der jeweiligen Mahlwalze 12, 14, sodass der Abstand zwischen der Abstreifplatte 52 und der Oberfläche der Mahlwalze 12, 14 in Richtung des Mahlwalzenendes geringer ist. Der Winkel zwischen der Abstreifplatte 52 und der Oberfläche der Mahlwalze 12, 14 beträgt beispielsweise 45° - 135° Es ist ebenfalls denkbar, dass sich die Vorderkante der Abstreifplatte 52 im Wesentlichen parallel zu der Oberfläche der jeweiligen Mahlwalze 12, 14 erstreckt, insbesondere in axialer Richtung der Mahlwalze. Die Seitenfläche der Abstreifplatte 52, sowie die Seitenfläche des Arms 50 erstrecken sich entlang des jeweiligen Randelements 18, 20. Insbesondere ist zwischen dem Abstreiferelement 42, 44 und der Oberfläche der Mahlwalze 12, 14 ein Spalt von mehr als oder gleich 1mm, insbesondere mehr als oder gleich 2 mm ausgebildet.The front edge of the stripper plate 52 extends in the embodiment of FIG 4 at an angle to the surface of the respective grinding roller 12, 14, so that the distance between the stripper plate 52 and the surface of the grinding roller 12, 14 is smaller in the direction of the grinding roller end. The angle between the stripper plate 52 and the surface of the grinding roller 12, 14 is 45° - 135°, for example. It is also conceivable that the front edge of the stripper plate 52 extends essentially parallel to the surface of the respective grinding roller 12, 14, in particular in the axial direction direction of the grinding roller. The side surface of the stripper plate 52 and the side surface of the arm 50 extend along the respective edge element 18, 20. In particular, between the stripper element 42, 44 and the surface of the grinding roller 12, 14 there is a gap of more than or equal to 1 mm, in particular more than or equal to 2 mm.

Die Befestigungsplatte 46, der Arm, die Klemmaufnahme 58 und die Klemmplatte 56 sind beispielsweise aus Stahl ausgebildet. Die Abstreifplatte ist beispielsweise aus einem hochverschleißfesten Material, wie Wolframcarbid ausgebildet.The mounting plate 46, arm, clamp seat 58 and clamp plate 56 are formed of steel, for example. The stripper plate is formed, for example, from a highly wear-resistant material such as tungsten carbide.

Fig. 5 zeigt eine Rückansicht des Abstreiferelements 42, 44 der Fig. 4. Der Arm 50 weist beispielhaft ein im Wesentlichen U-förmiges Profil auf, wobei die Klemmplatte 56 und die Klemmaufnahme 58 mittels Schrauben 54 und Muttern an dem Arm 50 angebracht sind. figure 5 shows a rear view of the wiper element 42, 44 of 4 . By way of example, the arm 50 has a substantially U-shaped profile, with the clamping plate 56 and the clamping receptacle 58 being attached to the arm 50 by means of screws 54 and nuts.

Im Betrieb der Walzenmühle 10 verhindern die Randelemente 18, 20 ein seitliches Austreten von Material aus dem Mahlspalt 16. Auf der Oberfläche der Mahlwalzen 12, 14 wird durch die Ablagerung von Material ein autogener Verschleißschutz aufgebaut. Die Abstreiferelemente 42, 44 streifen während der Rotation der Mahlwalze 12, 14 an den Endbereichen der Mahlwalze 12, 14 abgelagertes Material ab und sorgen somit dafür, dass die autogene Verschleißschutzschicht auch in den Endbereichen der Mahlwalzen 12, 14, an denen die Randelemente angebracht sind, nicht über eine bestimmte Dicke ansteigt, sodass die Randelemente zuverlässig vor hohem Druck durch abgelagertes Material geschützt werden.During operation of the roller mill 10, the edge elements 18, 20 prevent material from escaping laterally from the grinding gap 16. Autogenous wear protection is built up on the surface of the grinding rollers 12, 14 as a result of the deposition of material. During the rotation of the grinding roller 12, 14, the scraper elements 42, 44 strip off material that has been deposited on the end areas of the grinding roller 12, 14 and thus ensure that the autogenous wear protection layer is also removed in the end areas of the grinding rollers 12, 14, to which the edge elements are attached , does not increase beyond a certain thickness, so that the edge elements are reliably protected against high pressure from deposited material.

BezugszeichenlisteReference List

1010
Walzenmühleroller mill
1212
erste Mahlwalzefirst grinding roller
1414
zweite Mahlwalzesecond grinding roller
1616
Mahlspaltmilling gap
1818
erstes Randelementfirst boundary element
2020
zweites Randelementsecond boundary element
2222
erster Endbereich der ersten Mahlwalzefirst end area of the first grinding roller
2424
zweiter Endbereich der ersten Mahlwalzesecond end area of the first grinding roller
2626
zweiter Endbereich der zweiten Mahlwalzesecond end area of the second grinding roller
2828
erster Endbereich der zweiten Mahlwalzefirst end portion of the second grinding roller
3030
Antriebswelle der ersten MahlwalzeDrive shaft of the first grinding roller
3232
Antriebswelle der zweiten MahlwalzeDrive shaft of the second grinding roller
3434
erster stirnseitiger Spaltfirst frontal gap
3636
zweiter stirnseitiger Spaltsecond front gap
3838
Walzenrahmenroller frame
4040
Trägercarrier
4242
erstes Abstreiferelementfirst wiper element
4444
zweites Abstreiferelementsecond wiper element
4646
Befestigungsplattemounting plate
4848
Befestigungslöchermounting holes
5050
Armpoor
5252
Abstreifplattestripper plate
5454
Schraubenscrews
5656
Klemmplatteclamp plate
5858
Klemmaufnahmeclamp mount
6060
Muttermother

Claims (10)

  1. Roller mill (10) for comminuting granular material having
    a first mill roller (12) and a second mill roller (14), which are arranged opposite each other and can be driven in opposite directions,
    wherein a milling gap (16) is formed between the mill rollers (12, 14) and
    wherein at least one of the mill rollers (12, 14) has an edge element (18, 20) in an end region (22, 24, 26, 28) of the mill roller (12, 14), which is designed such that it extends over the milling gap (16) and at least partially covers the end face of the opposing mill roller (12, 14),
    characterised in that
    a scraper element (42, 44) for at least partially removing material, which is stationary relative to the mill rollers, is arranged in the end region (22, 24, 26, 28) of the mill roller (12, 14) provided with an edge element (18, 20), wherein the roller mill (10) has at least two scraper elements (42, 44), which are arranged in end regions of different roller ends of the mill roller (12, 14).
  2. Roller mill (10) according to claim 1, wherein the scraper element (42, 44) is arranged such that material deposited on the edge element (18, 20) and/or in the end region of the mill roller (12, 14) is at least partially removed during operation of the roller mill (10).
  3. Roller mill (10) according to any one of the preceding claims, wherein the scraper element (42, 44) is arranged at a distance from the edge element (18, 20) and the end region of the mill roller (12, 14).
  4. Roller mill (10) according to any one of the preceding claims, wherein the scraper element (42, 44) is arranged such that the distance between the scraper element (42, 44) and the edge element (18, 20) and/or between the scraper element (42, 44) and the end region of the mill roller (12, 14) is adjustable.
  5. Roller mill (10) according to any one of the preceding claims, wherein the roller mill (12, 14) has a stationary machine frame (38), and the scraper element (42, 44) is attached to the machine frame (38).
  6. Roller mill (10) according to any one of the preceding claims, wherein the scraper element (42, 44) has a stripper plate (52), which is made from a wear-resistant material such as, for example, tungsten carbide.
  7. Roller mill (10) according to any one of the preceding claims, wherein the scraper element (42, 44) has an arm (50), to which the stripper plate (52) is releasably attached.
  8. Roller mill (10) according to any one of the preceding claims, wherein each of the mill rollers (12, 14) each has an edge element (18, 20) in an end region (22, 24, 26, 28) of a roller end, which is designed such that it extends over the milling gap (16) and at least partially covers the end face of the opposing mill roller (12, 14).
  9. Roller mill (10) according to any one of the preceding claims, wherein the scraper element (42, 44) extends along an edge element (18, 20).
  10. Method for operating a roller mill (10) for comminuting granular material with a first mill roller (12) and a second mill roller (14), which are arranged opposite each other and can be driven in opposite directions, wherein a milling gap (16) is formed between the mill rollers (12, 14) and
    wherein at least one of the mill rollers (12, 14) has an edge element (18, 20) in an end region (22, 24, 26, 28) of a mill roller (12, 24), which is designed such that it extends over the milling gap (16) and at least partially covers the end face of the opposing mill roller (12, 14),
    wherein the method at least comprises the step of:
    removing material from an end region of a mill roller (12, 14), wherein the material is at least partially removed by means of two scraper elements (42, 44), which are stationary relative to the mill rollers, and which are arranged in end regions of different roller ends of the mill roller,
    wherein the material is removed in two end regions each provided with an edge element (18, 20).
EP18716235.9A 2017-05-11 2018-04-05 Roller mill and method for operating a roller mill Active EP3621742B1 (en)

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DE102017208014.0A DE102017208014A1 (en) 2017-05-11 2017-05-11 Roll mill and method for operating a roll mill
PCT/EP2018/058700 WO2018206200A1 (en) 2017-05-11 2018-04-05 Roller mill and method for operating a roller mill

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AU (1) AU2018264756B2 (en)
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CL (1) CL2019003207A1 (en)
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DE102019200190A1 (en) * 2019-01-09 2020-07-09 Thyssenkrupp Ag Grinding roller with edge elements
DE102019209514A1 (en) * 2019-06-28 2020-12-31 Thyssenkrupp Ag Roller mill and method of operating a roller mill
DE102019209511A1 (en) * 2019-06-28 2020-12-31 Thyssenkrupp Ag Roller mill with edge elements and method for adjusting an end gap of the roller mill
DE102019213493A1 (en) 2019-09-05 2021-03-11 Thyssenkrupp Ag Process for the production of alcohols
CN112058412B (en) * 2020-09-04 2021-11-02 浙江省东阳市开源金属制品有限公司 Horizontal multi-stage rolling ball mill
US20230127300A1 (en) 2021-10-22 2023-04-27 Metso Outotec USA Inc. Roller crusher and method for arrangement thereof
US20230129456A1 (en) 2021-10-22 2023-04-27 Metso Outotec USA Inc. Roller crusher and method for operating thereof
US11925942B2 (en) 2021-10-22 2024-03-12 Metso Outotec USA Inc. Roller crusher and method for operating thereof
US11938488B2 (en) * 2021-12-09 2024-03-26 Metso Outotec USA Inc. Roller crusher and method for operation thereof
US20240082849A1 (en) 2022-09-08 2024-03-14 Metso Outotec USA Inc. Roller crusher and a method for operating the same
DE102022126862A1 (en) 2022-10-14 2024-04-25 Flsmidth A/S Two-stage treatment plant
WO2024079707A1 (en) 2022-10-14 2024-04-18 Flsmidth A/S Two-stage processing plant

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PE20200043A1 (en) 2020-01-15
EP3621742A1 (en) 2020-03-18
FI3621742T3 (en) 2023-03-29
AU2018264756A1 (en) 2019-12-12
DE102017208014A1 (en) 2018-11-15
ZA201908218B (en) 2023-10-25
BR112019023541A2 (en) 2020-05-26
WO2018206200A1 (en) 2018-11-15
CL2019003207A1 (en) 2020-04-03
AU2018264756B2 (en) 2021-09-30
DK3621742T3 (en) 2023-03-20

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