EP3572153A1 - Roller mill with a scraper - Google Patents

Roller mill with a scraper Download PDF

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Publication number
EP3572153A1
EP3572153A1 EP18174238.8A EP18174238A EP3572153A1 EP 3572153 A1 EP3572153 A1 EP 3572153A1 EP 18174238 A EP18174238 A EP 18174238A EP 3572153 A1 EP3572153 A1 EP 3572153A1
Authority
EP
European Patent Office
Prior art keywords
blade
roll
roller
scraper
mill
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18174238.8A
Other languages
German (de)
French (fr)
Other versions
EP3572153B1 (en
Inventor
Daniel Rickenbach
Daniel Mark
Phillipe HOLENSTEIN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Buehler AG
Original Assignee
Buehler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to ES18174238T priority Critical patent/ES2823028T3/en
Application filed by Buehler AG filed Critical Buehler AG
Priority to EP18174238.8A priority patent/EP3572153B1/en
Priority to AU2019272925A priority patent/AU2019272925B2/en
Priority to MX2020012565A priority patent/MX2020012565A/en
Priority to JP2020565877A priority patent/JP6980135B2/en
Priority to KR1020207036746A priority patent/KR102318276B1/en
Priority to PCT/EP2019/063624 priority patent/WO2019224395A1/en
Priority to US17/058,423 priority patent/US11618034B2/en
Priority to BR112020023605-5A priority patent/BR112020023605B1/en
Priority to CN201980046406.4A priority patent/CN112423889A/en
Priority to CA3101384A priority patent/CA3101384C/en
Priority to RU2020142827A priority patent/RU2754044C1/en
Publication of EP3572153A1 publication Critical patent/EP3572153A1/en
Application granted granted Critical
Publication of EP3572153B1 publication Critical patent/EP3572153B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/40—Detachers, e.g. scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers

Definitions

  • the invention relates to a roller mill with a scraper according to the independent claim.
  • Cambered rolls are used in roll mills to counteract bending of the roll in operation, which is caused by the high contact forces that prevail when grinding ground material. It is thus ensured that the grinding gap has a uniform Mahlspaltbreite in operation.
  • a scraper is arranged, which is used for stripping of grinding material application.
  • the scraper is to ensure that regrind does not adhere to the roller, since such adhesion of regrind is undesirable in many respects.
  • regrind that sticks to the roll causes it to narrow again when passing through the refining gap, which can lead to unwanted vibrations and vibrations.
  • the adhering material to be ground is even more compressed and compacted, so that the removal of material adhering to the roller with a scraper is made more difficult. This is adversely affected by the high temperatures prevailing during grinding, which cause drying and "caking" of regrind.
  • adherent regrind provides a better adhesion surface for further millbase and favors the growth of such Mahlgutanhaftept. In the worst case, the roller must be stopped and laboriously freed from encrustations manually.
  • scrapers which have a blade with a resting state, or in the undeformed state, straight stripper edge, which is firmly clamped in a holder becomes.
  • the bracket is pivotally mounted below the roller, immediately after the nip, and is pressed against the roller in use by means of a counterweight which is attached to a bracket of the bracket.
  • the blade is aligned with the quiescent roll and the fixture is then bent in the center, which coincides with the center of the roll, by means of a pulling device (which often serves as a counterbalancing boom) to balance the roll's camber.
  • a pulling device which often serves as a counterbalancing boom
  • Such a scraper is in the EP 0 040 432 EP.
  • the roller mill comprises a housing with a Mahlguteinlass, at least one Mahlgutauslass and at least two cambered rollers, which are each arranged rotatably about a roll axis in the housing.
  • At least one roller is associated with a scraper.
  • a plurality of rollers preferably all rollers of the roller mill are equipped with a scraper.
  • a roller can be assigned to a plurality of scrapers.
  • the scraper comprises a blade for stripping ground material from a roll surface.
  • the blade has a scraper edge which extends the full length of the blade.
  • the length of the blade preferably corresponds substantially to the axial length of the roller so that the entire roller surface can be scraped off with one blade.
  • a segmented blade, consisting of several elements which can strung together stripping the entire roll surface, is also conceivable.
  • the scraper further comprises a holder with a receiving area, wherein the holder is arranged tiltable about an axis parallel to the roll axis in the housing.
  • the holder, and hence the blade can be removed from the roll surface by tilting, for example when no grinding operation is performed to protect the blade and the roll surface.
  • an elastic bearing is arranged between the blade and the receiving area according to the invention.
  • the blade Due to the elastic support in the receiving area of the blade is achieved that the blade is not firmly clamped in the holder, but a movement of the blade is made possible relative to the holder.
  • the blade touches the roll surface, it is bent and conforms to the roll surface, so that a crown and a bending or thermal expansion arising during operation of the roll can be compensated.
  • the elastic bearing is arranged on the side of the blade, which is in operation of the roller mill, when the blade touches the roller surface, which is loaded on pressure, so the roller is facing away.
  • the blade can thus be designed such that a bend for adaptation to the roll surface is possible, but for other bending moments, in particular bending moments parallel to the roll axis, is rigid, so that flutter of the blade is avoided in operation.
  • the support is arranged on the roll mill such that upon movement of the roll axis (e.g., a setback), the axis of the support remains parallel to the roll axis.
  • the receiving area is formed as a groove, wherein at least between a groove wall and the blade an elastic bearing is arranged.
  • the thickness of the bearing (on one or both sides of the blade) is within the scope of the invention typically between 2 and 10 mm.
  • the wall of the groove is referred to, which extends in the depth direction of the groove.
  • groove bottom is in the context of the present invention the wall of the groove, which faces away from an open side of the groove, which coincides with a lateral surface of the holder.
  • the groove is preferably formed as a groove with two mutually parallel groove walls and a flat groove bottom, which is arranged perpendicular to the groove walls.
  • an elastic bearing is arranged between the blade and both groove walls.
  • Such an embodiment allows bending of the blade on both sides, so that in order to allow the same freedom of movement as the above-described embodiment with only one elastic support, two half as thick elastic supports must be arranged on both sides of the blade.
  • the blade is preferably on a groove bottom.
  • the blade and the at least one elastic bearing are held in a clamping profile, which is arranged in the receiving area.
  • the blade and the at least one elastic bearing are held in a clamping profile.
  • the clamping profile is then inserted into the receiving area and held there with holding means.
  • the clamping profile can be configured such that an elastic bearing is arranged on a profile wall (which corresponds to a groove wall) or on both profile walls.
  • the blade on a profile bottom invest in order to avoid slipping.
  • the blade and / or the holder and / or the clamping profile comprises lateral limiting means, which avoid a displacement of the blade in the axial direction with respect to the roller axis.
  • the blade is preferably designed as a flat profile, in particular with a rectangular cross-section.
  • the blade is preferably formed from a cold-rolled steel strip (eg in steel quality WB, without chrome and nickel, hardened, tempered and white-polished). Particularly preferred are blades with a tensile strength in the range of 1'550 - 2'350 MPa (measured according to EN 10132-1).
  • the thickness of the blade is typically 0.5 to 2 mm in the context of the invention.
  • the blade has a length to width ratio of 1.6: 1 to 300: 1.
  • blade length means the spatial extent of the blade in the extension direction of the wiper edge.
  • the length of the blade can be between 100mm and 3'000mm, preferably between 500mm and 2'500mm, more preferably between 1'000mmm and 2'000mm, for example 1'500mm.
  • the spatial extent is meant perpendicular to the blade length.
  • the width of the blade may be between 10mm and 60mm, preferably between 20mm and 55mm, more preferably 30mm and 50mm, for example 40mm.
  • the blade height is thus understood to mean the spatial extent of the blade perpendicular to the blade length and to the blade width, which extends from the wiper edge to an end facing away from the wiper edge.
  • the blade height typically, within the scope of the invention, between 10 and 30 mm of the total blade height are accommodated in the elastomeric bearing.
  • the blade has a height to free height ratio of 1: 1 to 6: 1.
  • the free height of the blade means the height dimension of the blade, which protrudes from the holder. Since the blade does not touch the holder, the free height is thus understood to mean the height dimension between the wiper edge and an (imaginary) envelope surface of the holder.
  • the blade is preferably arranged at an angle between 20 ° and 75 °, preferably between 30 ° and 60 °, more preferably between 30 ° and 50 ° to the roll surface when the blade touches the roll surface.
  • the angle is measured as the angle between a plane tangent to the roll surface and the height direction of the blade.
  • the blade Since the roller is cambered, the blade is bent according to the invention when touching the roller and consequently the angle varies slightly over the length of the blade, the reference angle used is the angle in the middle of the roller where the crown of the roller is maximum.
  • the elastic support may be formed of or include elastomeric materials, preferably selected from the group consisting of: natural rubber (NR); Styrene-butadiene rubber (SBR); Butyl rubber (IIR); Ethylene-propylene rubber (EPDM); Nitrile rubber (NBR); Chloroprene neoprene (CR); Chlorosulfonated polyethylene, Hypalon (CSM); Polyurethane rubber (AU, EU); Silicone rubber ((M) Q); Polyacrylate elastomer (ACM); hydrogenated nitrile rubber (H-NBR); Fluororubber, Viton (FPM); Polyurethane (PU). Particularly preferred are ethylene-propylene rubber (EPDM) and silicone rubber ((M) Q).
  • the elastic bearing is designed as an elastomer strip.
  • the storage in particular the elastomeric strip, can be formed continuously or interrupted over the entire length of the blade.
  • An interrupted training of the storage is possible and useful in particular for the individual adaptation of the rigidity of the resulting total storage.
  • a harder material may be intermittently arranged to achieve a total bearing hardness that corresponds to continuous support of a softer material.
  • the bearing in particular the elastomeric material of the elastomeric strip, has a hardness of between 15 and 100 Shore OO, preferably between 30 and 90 Shore OO, more preferably between 40 and 80 Shore OO (according to ASTM D 2240, and / or between 5 and 30 Shore A (measured according to DIN ISO 7619-1).
  • the density of the elastic storage can be between 0.25 g / cm 3 and 0.85 g / cm 3 , preferably 0.35 g / cm 3 and 0.75 g / cm 3 , particularly preferably 0.45 g / cm 3 and 0.65 g / cm 3 (according to DIN 53479 A ) amount.
  • Such an embodiment represents a very simple and cost-effective variant.
  • the strip can be replaced and the hardness can be adjusted.
  • the holder is preferably provided with a counterweight, by means of which the blade can be tilted about the axis and can be pressed against the roller surface.
  • the scraper is preferably in operative connection with a lift-off device, by means of which the blade can be tilted about the axis and moved away from the roll surface.
  • This embodiment allows removal of the blade from the roller surface when no grinding is taking place, and in particular is coupled to an actuator arrangement of the rollers so that upon engagement and / or disengagement of the rollers the blade is also brought into contact with the blade surface and / or this is moved away.
  • the blade is preferably arranged such that the wiper edge is parallel to the roll axis when the blade does not touch the roll surface.
  • the blade is preferably received over its entire length in the receiving area.
  • the elastic bearing is thus formed over the entire length of the blade.
  • the blade can be received only in sections in the receiving area and / or the elastic support may be formed only in sections over the length of the blade. It is understood that in such a case, in the areas without elastic support, the blade, if it does not touch the roll surface, must not touch the receiving area also.
  • FIG. 1 schematically a roll mill 1 according to the present invention is shown.
  • the roll mill 1 comprises a Housing 2 with a Mahlguteinlass, indicated by the arrow 3, and a Mahlgutauslass 4, also indicated by the arrow 4.
  • a housing 2 In the housing 2, two cambered rollers 5 and 5 'are arranged, which are each mounted rotatably about a roller axis 6 and 6' and are driven in opposite directions by means of a drive, not shown.
  • the direction of rotation of the rollers 5 and 5 ' is indicated in each case by an arrow.
  • each roller 5 or 5 ' is associated with a scraper 7 or 7'.
  • the scraper 7 of the roller 5 is in two possible variants separately in the Figures 2 and 3 shown.
  • the scraper 7 of the Figures 2 and 3 comprises a blade 8, which is formed from a flat metal profile with a length L, a width B and a height H.
  • the longitudinal direction of the blade 8 is indicated by the vector L.
  • the blade 8 is inclined at an angle .alpha. between a plane TE tangent to the roller surface 9 at the point of contact of the blade 8 and the blade 8, with a blade edge 8 having a pointed edge.
  • the stiffener 7 has a holder 11 which is arranged tiltable about an axis 13.
  • the axis 13 extends parallel to the roll axis 6 or 6 'and remains parallel to the roll axis 6 or 6', even if the roll axis is displaced, for example, with a setting of the rolls.
  • the holder 11 comprises a receiving region 12, which serves as a groove 15 with two parallel to one another extending groove walls 16 and 16 'and a groove bottom 17 extending perpendicular thereto extending in the longitudinal direction L of the blade 8 (and thus the holder 11).
  • the blade 8 is arranged in the groove 15 and contacts the groove bottom 17 with the end facing away from the wiper edge.
  • an elastomer strip 14 is arranged between the respective groove wall 16 or 16 'and the blade, so that the blade 8 in the groove 15 enjoys a certain freedom of movement and in particular bent by a bending moment parallel to the height of the blade 8 and can adapt to the crowning of the roller 5.
  • the free height of the blade 8 is referred to, which corresponds to the height of the blade 8, which is not disposed between the elastomeric strip 14.
  • the holder So that the blade 8 can be pressed against the roller surface 9, the holder 11, as already explained above, arranged tiltable about the axis 13.
  • the holder comprises a counterweight 19, which causes by leveraging the tilting of the holder 11 and the pressing of the blade 8 against the roller surface 9.
  • the Indian FIG. 3 shown scraper 7 corresponds in construction essentially the scraper 7 of FIG. 2 with the difference that the blade 8 and the elastomer strips 14 are arranged in a clamping profile 18, wherein the clamping profile 18 is inserted in the receiving region 12 of the holder 11.
  • the clamping profile 18 is formed as a plastic profile and has two mutually parallel profile walls 160 and 160 'and a perpendicular thereto profile bottom 170 which correspond in function to the groove walls 16 and 16' and the groove bottom 17.
  • the clamping profile 18 simplifies the placing of the blade 8 with the elastomer strip 14 in the receiving area 12th

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Cleaning In General (AREA)

Abstract

Die Erfindung betrifft eine Walzenmühle (1) umfassend ein Gehäuse (2) mit einem Mahlguteinlass (3), wenigstens einem Mahlgutauslass (4) und wenigstens zwei bombierten Walzen (5, 5'), welche jeweils drehbar um eine Walzenachse (6) im Gehäuse (2) angeordnet sind, wobei wenigstens einer Walze (5) ein Abstreifer (7) zugeordnet ist. Erfindungsgemäss weist der Abstreifer (7) eine Klinge (8) zum Abstreifen von Mahlgut von einer Walzenoberfläche (9) mit einer Abstreiferkante (10) auf, welche sich über die gesamte Lange (L) der Klinge (8) erstreckt, und umfasst eine Halterung (11) mit einem Aufnahmebereich (12), wobei die Halterung um eine Achse (13) parallel zur Walzenachse kippbar im Gehäuse (2) angeordnet ist und wobei zwischen der Klinge (8) und dem Aufnahmebereich (12) eine elastische Lagerung (14) angeordnet ist.The invention relates to a roller mill (1) comprising a housing (2) with a grinding material inlet (3), at least one grinding material outlet (4) and at least two cambered rollers (5, 5 ') which are each rotatable about a roller axis (6) in the housing (2) are arranged, wherein at least one roller (5) is assigned a scraper (7). According to the invention, the scraper (7) has a blade (8) for scrap removal from a roll surface (9) with a scraper edge (10) which extends over the entire length (L) of the blade (8), and comprises a holder (11) with a receiving area (12), wherein the holder about an axis (13) is arranged parallel to the roll axis tiltable in the housing (2) and wherein between the blade (8) and the receiving area (12) has an elastic bearing (14) is arranged.

Description

Die Erfindung betrifft eine Walzenmühle mit einem Abstreifer nach dem unabhängigen Anspruch.The invention relates to a roller mill with a scraper according to the independent claim.

Bombierte Walzen werden bei Walzenmühlen verwendet, um einer Biegung der Walze in Betrieb entgegenzuwirken, welche durch die hohen Anpresskräfte verursacht wird, die beim Vermahlen von Mahlgut herrschen. Es wird somit sichergestellt, dass der Mahlspalt in Betrieb eine gleichmässige Mahlspaltbreite aufweist. Unmittelbar nach dem Mahlspalt ist ein Abstreifer angeordnet, welcher zum Abstreifen von Mahlgut Anwendung findet.Cambered rolls are used in roll mills to counteract bending of the roll in operation, which is caused by the high contact forces that prevail when grinding ground material. It is thus ensured that the grinding gap has a uniform Mahlspaltbreite in operation. Immediately after the grinding gap, a scraper is arranged, which is used for stripping of grinding material application.

Der Abstreifer soll sicherstellen, dass Mahlgut nicht an der Walze haften bleibt, da eine solche Haftung von Mahlgut in vielerlei Hinsicht unerwünscht ist. Zum einen verursacht Mahlgut, das an der Walze haften bleibt, beim erneuten Passieren des Mahlspalts eine Verengung desselben, die zu unerwünschten Schwingungen und Vibrationen führen kann. Zum anderen wird beim erneuten Passieren des Mahlspalts das haftende Mahlgut noch mehr zusammengepresst und verdichtet, so dass die Entfernung von an der Walze haftendem Mahlgut mit einem Abstreifer erschwert wird. Ungünstig beeinflusst wird dies durch die beim Vermahlen herrschenden, hohen Temperaturen, welche ein Trocknen und "Festbacken" von Mahlgut verursachen. Zudem bietet haftende Mahlgut eine bessere Haftfläche für weiteres Mahlgut und begünstigt das Wachstum von solchen Mahlgutanhaftungen. Im schlimmsten Fall muss die Walze gestoppt und aufwendig manuell von Verkrustungen befreit werden.The scraper is to ensure that regrind does not adhere to the roller, since such adhesion of regrind is undesirable in many respects. On the one hand, regrind that sticks to the roll causes it to narrow again when passing through the refining gap, which can lead to unwanted vibrations and vibrations. On the other hand, when the grinding gap passes again, the adhering material to be ground is even more compressed and compacted, so that the removal of material adhering to the roller with a scraper is made more difficult. This is adversely affected by the high temperatures prevailing during grinding, which cause drying and "caking" of regrind. In addition, adherent regrind provides a better adhesion surface for further millbase and favors the growth of such Mahlgutanhaftungen. In the worst case, the roller must be stopped and laboriously freed from encrustations manually.

Bis jetzt werden Abstreifer verwendet, welche eine Klinge mit einer in Ruhezustand, bzw. in unverformtem Zustand, geraden Abstreiferkante aufweisen, die in einer Halterung fest eingespannt wird. Die Halterung ist unterhalb der Walze, unmittelbar nach dem Walzenspalt, schwenkbar angeordnet und wird in Betrieb mittels eines Gegengewichtes, welches an einem Ausleger der Halterung befestigt ist, gegen die Walze gepresst.To date, scrapers are used which have a blade with a resting state, or in the undeformed state, straight stripper edge, which is firmly clamped in a holder becomes. The bracket is pivotally mounted below the roller, immediately after the nip, and is pressed against the roller in use by means of a counterweight which is attached to a bracket of the bracket.

Die Klinge wird an der ruhenden Walze ausgerichtet und die Halterung wird dann in der Mitte, welche mit der Mitte der Walze übereinstimmt, mithilfe einer Zugvorrichtung (die oft gleichzeitig als Ausleger für das Gegengewicht dient) gebogen, um die Bombage der Walze auszugleichen. Ein solcher Abstreifer ist in der EP 0 040 432 EP gezeigt.The blade is aligned with the quiescent roll and the fixture is then bent in the center, which coincides with the center of the roll, by means of a pulling device (which often serves as a counterbalancing boom) to balance the roll's camber. Such a scraper is in the EP 0 040 432 EP.

Da ein solcher Ausgleich bei ruhender Walze stattfindet, die Walze aber in Betrieb gebogen wird und die Bombage sich entsprechend ändert, ist eine solche Lösung nicht zufriedenstellend. Zwar kann eine ursprünglich gerade Klinge eingeschliffen werden, um einer Walzenbombierung entgegenzukommen; es bleiben aber trotzdem noch andere Ursachen für ein Nicht-Anliegen des Abstreifers an der Walze. Zum Beispiel bleibt eine Bombierung wegen Deformation und Wärmedehnung im Betrieb nicht konstant. Im Stand der Technik wird eine höhere Anpresskraft des Abstreifers benützt (um ihn zu verformen, sodass er sich genügend gut der Walzenoberfläche anpasst), als eigentlich für die effektive Reinigung erforderlich wäre. Diese höhere Anpresskraft resultiert in einem unnötig hohen Verschleiss des Abstreifers und der Walzenoberfläche.Since such compensation takes place when the roller is stationary, but the roller is bent into operation and the camber changes accordingly, such a solution is unsatisfactory. Although an originally straight blade can be ground to accommodate a Walzenbombierung; but there are still other causes for a non-concern of the scraper on the roller. For example, a camber due to deformation and thermal expansion during operation does not remain constant. In the prior art, a higher contact force of the scraper is used (to deform it so that it adapts well enough to the roll surface) than would actually be required for effective cleaning. This higher contact force results in unnecessarily high wear of the scraper and the roll surface.

Es ist daher Aufgabe der vorliegenden Erfindung eine Walzenmühle mit wenigstens einem Abstreifer anzugeben, welche die Vorteile des Bekannten vermeidet und insbesondere eine optimale Anpassung an die Bombage einer Walze in Betrieb bei Einhaltung der Sicherheitsvorschriften ermöglicht und verschleissarm ist.It is therefore an object of the present invention to provide a roller mill with at least one scraper, which avoids the advantages of the known and in particular allows optimal adaptation to the camber of a roller in operation in compliance with safety regulations and is low in wear.

Die Aufgabe wird mit einer Walzenmühle nach dem unabhängigen Anspruch gelöst.The object is achieved with a roller mill according to the independent claim.

Die Walzenmühle umfasst ein Gehäuse mit einem Mahlguteinlass, wenigstens einem Mahlgutauslass und wenigstens zwei bombierten Walzen, welche jeweils drehbar um eine Walzenachse im Gehäuse angeordnet sind.The roller mill comprises a housing with a Mahlguteinlass, at least one Mahlgutauslass and at least two cambered rollers, which are each arranged rotatably about a roll axis in the housing.

Wenigstens einer Walze ist ein Abstreifer zugeordnet. Bevorzugt sind mehrere Walzen, vorzugsweise alle Walzen der Walzenmühle mit einem Abstreifer ausgestattet. Auch kann einer Walze eine Mehrzahl von Abstreifern zugeordnet werden.At least one roller is associated with a scraper. Preferably, a plurality of rollers, preferably all rollers of the roller mill are equipped with a scraper. Also, a roller can be assigned to a plurality of scrapers.

Erfindungsgemäss umfasst der Abstreifer eine Klinge zum Abstreifen von Mahlgut von einer Walzenoberfläche. Die Klinge weist eine Abstreiferkante auf, welche sich über die gesamte Länge der Klinge erstreckt. Die Länge der Klinge entspricht vorzugsweise im Wesentlichen der axialen Länge der Walze, so dass mit einer Klinge die gesamte Walzenoberfläche abgestreift werden kann. Eine segmentierte Klinge, bestehend aus mehreren Elementen, welche aneinandergereiht die gesamte Walzenoberfläche abstreifen können, ist ebenso denkbar.According to the invention, the scraper comprises a blade for stripping ground material from a roll surface. The blade has a scraper edge which extends the full length of the blade. The length of the blade preferably corresponds substantially to the axial length of the roller so that the entire roller surface can be scraped off with one blade. A segmented blade, consisting of several elements which can strung together stripping the entire roll surface, is also conceivable.

Der Abstreifer umfasst ferner eine Halterung mit einem Aufnahmebereich, wobei die Halterung um eine Achse parallel zur Walzenachse kippbar im Gehäuse angeordnet ist. Die Halterung und demzufolge die Klinge kann somit durch Kippen von der Walzenoberfläche entfernt werden, beispielsweise wenn kein Mahlvorgang durchgeführt wird, um die Klinge und die Walzenoberfläche zu schonen.The scraper further comprises a holder with a receiving area, wherein the holder is arranged tiltable about an axis parallel to the roll axis in the housing. Thus, the holder, and hence the blade, can be removed from the roll surface by tilting, for example when no grinding operation is performed to protect the blade and the roll surface.

Zwischen der Klinge und dem Aufnahmebereich ist erfindungsgemäss eine elastische Lagerung angeordnet.Between the blade and the receiving area according to the invention an elastic bearing is arranged.

Durch die elastische Lagerung im Aufnahmebereich der Klinge wird erreicht, dass die Klinge nicht fest in der Halterung eingespannt wird, sondern eine Bewegung der Klinge relativ zur Halterung ermöglicht wird. Insbesondere wird die Klinge, wenn diese die Walzenoberfläche berührt, gebogen und schmiegt sich an die Walzenoberfläche an, so dass eine Bombierung und eine in Betrieb der Walze entstehende Biegung, bzw. Wärmedehnung, ausgeglichen werden können. Es versteht sich, dass die elastische Lagerung an der Seite der Klinge angeordnet ist, die in Betrieb der Walzenmühle, wenn die Klinge die Walzenoberfläche berührt, die auf Druck belastet wird, also der Walze abgewandt ist. Die Klinge kann somit derart ausgestaltet werden, dass eine Biegung zur Anpassung an die Walzenoberfläche möglich ist, jedoch für andere Biegemomente, insbesondere Biegemomente parallel zur Walzenachse, biegesteif ist, so dass ein Flattern der Klinge in Betrieb vermieden wird. Bevorzugt ist die Halterung an der Walzenmühle derart angeordnet, dass bei einer Bewegung der Walzenachse (z.B. eine Schränkung) die Achse der Halterung parallel zur Walzenachse bleibt.Due to the elastic support in the receiving area of the blade is achieved that the blade is not firmly clamped in the holder, but a movement of the blade is made possible relative to the holder. In particular, when the blade touches the roll surface, it is bent and conforms to the roll surface, so that a crown and a bending or thermal expansion arising during operation of the roll can be compensated. It is understood that the elastic bearing is arranged on the side of the blade, which is in operation of the roller mill, when the blade touches the roller surface, which is loaded on pressure, so the roller is facing away. The blade can thus be designed such that a bend for adaptation to the roll surface is possible, but for other bending moments, in particular bending moments parallel to the roll axis, is rigid, so that flutter of the blade is avoided in operation. Preferably, the support is arranged on the roll mill such that upon movement of the roll axis (e.g., a setback), the axis of the support remains parallel to the roll axis.

Bevorzugt ist der Aufnahmebereich als Nut ausgebildet, wobei wenigstens zwischen einer Nutwand und der Klinge eine elastische Lagerung angeordnet ist.Preferably, the receiving area is formed as a groove, wherein at least between a groove wall and the blade an elastic bearing is arranged.

Die Dicke der Lagerung (auf einer oder beiden Seiten der Klinge) liegt im Rahmen der Erfindung typischerweise zwischen 2 und 10 mm.The thickness of the bearing (on one or both sides of the blade) is within the scope of the invention typically between 2 and 10 mm.

Als Nutwand im Sinne der vorliegenden Erfindung wird die Wand der Nut bezeichnet, welche sich in Tiefenrichtung der Nut erstreckt. Als Nutboden wird im Sinne der vorliegenden Erfindung die Wand der Nut, welche einer offenen Seite der Nut, die mit einer Mantelfläche der Halterung übereinstimmt, abgewandt ist.As a groove wall according to the present invention, the wall of the groove is referred to, which extends in the depth direction of the groove. As groove bottom is in the context of the present invention the wall of the groove, which faces away from an open side of the groove, which coincides with a lateral surface of the holder.

Die Nut ist dabei bevorzugt als Nut mit zwei zueinander parallelen Nutwänden und einem ebenen Nutboden, der senkrecht zu den Nutwänden angeordnet ist, ausgebildet.The groove is preferably formed as a groove with two mutually parallel groove walls and a flat groove bottom, which is arranged perpendicular to the groove walls.

Bevorzugt ist zwischen der Klinge und beiden Nutwänden eine elastische Lagerung angeordnet.Preferably, an elastic bearing is arranged between the blade and both groove walls.

Eine solche Ausführungsform erlaubt eine Biegung der Klinge an beiden Seiten, so dass, um die gleiche Bewegungsfreiheit wie die oben beschriebene Ausführungsform mit nur einer elastischen Lagerung zu ermöglichen, zwei halb so dicke elastische Lagerungen an beiden Seiten der Klinge angeordnet werden müssen.Such an embodiment allows bending of the blade on both sides, so that in order to allow the same freedom of movement as the above-described embodiment with only one elastic support, two half as thick elastic supports must be arranged on both sides of the blade.

Die Klinge liegt bevorzugt an einem Nutboden an.The blade is preferably on a groove bottom.

Dadurch wird sichergestellt, dass ein Verrutschen der Klinge aufgrund des Anpressdruckes der Klinge gegen die Walzenoberfläche, vermieden wird, da die Klinge, im Gegensatz zu Abstreifern nach dem Stand der Technik, nicht starr mit der Halterung verbunden ist.This ensures that slippage of the blade due to contact pressure of the blade against the roller surface is avoided because the blade, unlike prior art wipers, is not rigidly connected to the support.

Bevorzugt sind die Klinge und die wenigstens eine elastische Lagerung in einem Klemmprofil gehalten, welcher in dem Aufnahmebereich angeordnet ist.Preferably, the blade and the at least one elastic bearing are held in a clamping profile, which is arranged in the receiving area.

Um die Montage zu vereinfachen kann es vorgesehen werden, dass die Klinge und die wenigstens eine elastische Lagerung in einem Klemmprofil gehalten werden. Das Klemmprofil wird dann in den Aufnahmebereich gesteckt und dort mit Haltemitteln gehalten.In order to simplify assembly, it may be provided that the blade and the at least one elastic bearing are held in a clamping profile. The clamping profile is then inserted into the receiving area and held there with holding means.

Entsprechend der oben beschriebenen Ausführungsformen betreffend die Ausgestaltung der Klinge und der wenigstens einen elastischen Lagerung in der Nut kann das Klemmprofil derart ausgestaltet sein, dass an einer Profilwand (welche einer Nutwand entspricht) oder an beiden Profilwänden eine elastische Lagerung angeordnet ist. Ebenso kann die Klinge an einem Profilboden (entspricht dem Nutboden) anlegen, um ein Verrutschen zu vermeiden.According to the embodiments described above concerning the configuration of the blade and the at least one elastic mounting in the groove, the clamping profile can be configured such that an elastic bearing is arranged on a profile wall (which corresponds to a groove wall) or on both profile walls. Likewise, the blade on a profile bottom (corresponding to the groove bottom) invest in order to avoid slipping.

Bevorzugt umfasst die Klinge und/oder die Halterung und/oder das Klemmprofil seitliche Begrenzungsmittel, welche eine Verschiebung der Klinge in axialer Richtung bezüglich der Walzenachse vermeiden.Preferably, the blade and / or the holder and / or the clamping profile comprises lateral limiting means, which avoid a displacement of the blade in the axial direction with respect to the roller axis.

Die Klinge ist bevorzugt als flächiges Profil, insbesondere mit rechteckigem Querschnitt, ausgebildet.The blade is preferably designed as a flat profile, in particular with a rectangular cross-section.

Die Klinge ist bevorzugt aus einem kaltgewalzte Stahlband geformt (bspw. in Stahlqualität WB, ohne Chrom und Nickel, gehärtet, angelassen und weisspoliert). Besonders bevorzugt sind Klingen mit einer Zugfestigkeit im Bereich von 1'550 - 2'350 MPa (gemessen gemäss EN 10132-1).The blade is preferably formed from a cold-rolled steel strip (eg in steel quality WB, without chrome and nickel, hardened, tempered and white-polished). Particularly preferred are blades with a tensile strength in the range of 1'550 - 2'350 MPa (measured according to EN 10132-1).

Die Dicke der Klinge beträgt im Rahmen der Erfindung typischerweise 0.5 bis 2 mm.The thickness of the blade is typically 0.5 to 2 mm in the context of the invention.

Bevorzugt weist die Klinge ein Verhältnis Länge zu Breite von 1.6:1 bis 300:1 auf.Preferably, the blade has a length to width ratio of 1.6: 1 to 300: 1.

Als Klingenlänge ist im Sinne der vorliegenden Anmeldung die räumliche Ausdehnung der Klinge in Erstreckungsrichtung der Abstreiferkante gemeint. Die Länge der Klinge kann zwischen 100mm und 3'000mm betragen, vorzugsweise zwischen 500mm und 2'500mm, besonders bevorzugt zwischen 1'000mmm und 2'000mm, beispielsweise 1'500mm.For the purposes of the present application, the term blade length means the spatial extent of the blade in the extension direction of the wiper edge. The length of the blade can be between 100mm and 3'000mm, preferably between 500mm and 2'500mm, more preferably between 1'000mmm and 2'000mm, for example 1'500mm.

Als Klingenbreite wird im Sinne der vorliegenden Anmeldung die räumliche Ausdehnung senkrecht zur Klingenlänge gemeint. Die Breite der Klinge kann zwischen 10mm und 60mm betragen, vorzugsweise zwischen 20mm und 55mm, besonders bevorzugt 30mm und 50mm, beispielsweise 40mm.As blade width in the sense of the present application, the spatial extent is meant perpendicular to the blade length. The width of the blade may be between 10mm and 60mm, preferably between 20mm and 55mm, more preferably 30mm and 50mm, for example 40mm.

Als Klingenhöhe wird folglich im Sinne der vorliegenden Anmeldung die räumliche Ausdehnung der Klinge senkrecht zur Klingenlänge und zur Klingenbreite gemeint, welche sich von der Abstreiferkante zu einem der Abstreiferkante abgewandten Ende erstreckt. Typischerweise sind im Rahmen der Erfindung zwischen 10 und 30 mmm der gesamten Klingenhöhe in der elastomeren Lagerung aufgenommen.For the purposes of the present application, the blade height is thus understood to mean the spatial extent of the blade perpendicular to the blade length and to the blade width, which extends from the wiper edge to an end facing away from the wiper edge. Typically, within the scope of the invention, between 10 and 30 mm of the total blade height are accommodated in the elastomeric bearing.

Bevorzugt weist die Klinge ein Verhältnis der Höhe zur freien Höhe von 1:1 bis 6:1 auf.Preferably, the blade has a height to free height ratio of 1: 1 to 6: 1.

Als freie Höhe der Klinge ist im Sinne der vorliegenden Anmeldung die Höhenabmessung der Klinge gemeint, die aus der Halterung herausragt. Da die Klinge die Halterung nicht berührt, wird folglich als freie Höhe die Höhenabmessung zwischen der Abstreiferkante und einer (imaginären) Hüllfläche der Halterung verstanden.For the purposes of the present application, the free height of the blade means the height dimension of the blade, which protrudes from the holder. Since the blade does not touch the holder, the free height is thus understood to mean the height dimension between the wiper edge and an (imaginary) envelope surface of the holder.

Die Klinge ist bevorzugt mit einem Winkel zwischen 20° und 75°, bevorzugt zwischen 30° und 60°, besonders bevorzugt zwischen 30° und 50° zur Walzenoberfläche angeordnet, wenn die Klinge die Walzenoberfläche berührt.The blade is preferably arranged at an angle between 20 ° and 75 °, preferably between 30 ° and 60 °, more preferably between 30 ° and 50 ° to the roll surface when the blade touches the roll surface.

Der Winkel wird als Winkel zwischen einer Ebene tangential zur Walzenoberfläche und die Höhenerstreckungsrichtung der Klinge gemessen.The angle is measured as the angle between a plane tangent to the roll surface and the height direction of the blade.

Da die Walze bombiert ist, die Klinge beim Berühren der Walze erfindungsgemäss gebogen wird und folglich der Winkel über die Länge der Klinge leicht variiert, wird als Bezugswinkel der Winkel in der Mitte der Walze, wo die Bombierung der Walze maximal ist, herangezogen.Since the roller is cambered, the blade is bent according to the invention when touching the roller and consequently the angle varies slightly over the length of the blade, the reference angle used is the angle in the middle of the roller where the crown of the roller is maximum.

Die elastische Lagerung kann aus elastomeren Materialen gebildet sein oder solche umfassen, vorzugsweise ausgewählt aus der Gruppe bestehend aus: Naturgummi (NR); Styrol-Butadien Kautschuk (SBR); Butyl-Kautschuk (IIR); Ethylen-Propylen-Kautschuk (EPDM); Nitril-Kautschuk (NBR); Chloropren Neoprene (CR); Chlorsulfoniertes Polyethylen, Hypalon (CSM); Polyurethan-kautschuk (AU, EU); Silikon-kautschuk ((M)Q); Polyacrylat-elastomer (ACM); hydrierter Nitrilkautschuk (H-NBR); Fluorkautschuk, Viton (FPM); Polyurethan (PU). Besonders bevorzugt sind Ethylen-Propylen-Kautschuk (EPDM) sowie Silikon-kautschuk ((M)Q).The elastic support may be formed of or include elastomeric materials, preferably selected from the group consisting of: natural rubber (NR); Styrene-butadiene rubber (SBR); Butyl rubber (IIR); Ethylene-propylene rubber (EPDM); Nitrile rubber (NBR); Chloroprene neoprene (CR); Chlorosulfonated polyethylene, Hypalon (CSM); Polyurethane rubber (AU, EU); Silicone rubber ((M) Q); Polyacrylate elastomer (ACM); hydrogenated nitrile rubber (H-NBR); Fluororubber, Viton (FPM); Polyurethane (PU). Particularly preferred are ethylene-propylene rubber (EPDM) and silicone rubber ((M) Q).

Im einfachsten Fall ist die elastische Lagerung als Elastomerstreifen ausgebildet. Die Lagerung, insbesondere der Elastomerstreifen, kann über die ganze Klingenlänge durchgehend oder auch unterbrochen ausgebildet sein. Eine unterbrochene Ausbildung der Lagerung ist insbesondere zur individuellen Anpassung der Steifigkeit der resultierenden Gesamtlagerung möglich und sinnvoll; so kann beispielsweise ein härteres Material unterbrochen angeordnet werden, um eine Härte der Gesamtlagerung zu erzielen, die einer durchgehenden Lagerung aus einem weicheren Material entspricht.In the simplest case, the elastic bearing is designed as an elastomer strip. The storage, in particular the elastomeric strip, can be formed continuously or interrupted over the entire length of the blade. An interrupted training of the storage is possible and useful in particular for the individual adaptation of the rigidity of the resulting total storage. For example, a harder material may be intermittently arranged to achieve a total bearing hardness that corresponds to continuous support of a softer material.

Die Lagerung, insbesondere das elastomere Material des Elastomerstreifens, weist eine Härte zwischen 15 und 100 Shore OO, vorzugsweise zwischen 30 und 90 Shore OO, besonders bevorzugt zwischen 40 und 80 Shore OO (gemäss ASTM D 2240; und/oder zwischen 5 und 30 Shore A (gemessen gemäss DIN ISO 7619-1) auf.The bearing, in particular the elastomeric material of the elastomeric strip, has a hardness of between 15 and 100 Shore OO, preferably between 30 and 90 Shore OO, more preferably between 40 and 80 Shore OO (according to ASTM D 2240, and / or between 5 and 30 Shore A (measured according to DIN ISO 7619-1).

Die Dichte der elastischen Lagerung kann zwischen 0.25 g/cm3 und 0.85 g/cm3, vorzugsweise 0.35 g/cm3 und 0.75 g/cm3, besonders bevorzugt 0.45 g/cm3 und 0.65 g/cm3 (gemäss DIN 53479 A) betragen.The density of the elastic storage can be between 0.25 g / cm 3 and 0.85 g / cm 3 , preferably 0.35 g / cm 3 and 0.75 g / cm 3 , particularly preferably 0.45 g / cm 3 and 0.65 g / cm 3 (according to DIN 53479 A ) amount.

Eine solche Ausführungsform stellt eine sehr einfache und kostengünstige Variante dar. Zudem kann, je nach Anwendung, der Streifen ausgetauscht werden und die Härte angepasst werden.Such an embodiment represents a very simple and cost-effective variant. In addition, depending on the application, the strip can be replaced and the hardness can be adjusted.

Die Halterung ist bevorzugt mit einem Gegengewicht versehen, mittels welchem die Klinge um die Achse kippbar und gegen die Walzenoberfläche pressbar ist.The holder is preferably provided with a counterweight, by means of which the blade can be tilted about the axis and can be pressed against the roller surface.

Dadurch kann auf einfache Art und Weise der Anpressdruck der Klinge gegen die Walze eingestellt werden, sei es durch Änderung des Gewichtes und/oder der Hebelarmlänge.This can be adjusted in a simple manner, the contact pressure of the blade against the roller, either by changing the weight and / or the Hebelarmlänge.

Der Abstreifer steht bevorzugt mit einer Abhebevorrichtung in Wirkverbindung, mittels welcher die Klinge um die Achse kippbar und von der Walzenoberfläche weg bewegbar ist.The scraper is preferably in operative connection with a lift-off device, by means of which the blade can be tilted about the axis and moved away from the roll surface.

Diese Ausführungsform erlaubt die Entfernung der Klinge von der Walzenoberfläche, wenn kein Mahlvorgang stattfindet und ist insbesondere mit einer Aktuatoranordnung der Walzen gekoppelt, so dass beim Ein- und/oder Ausrücken der Walzen die Klinge ebenfalls mit der Klingenoberfläche in Berührung gebracht wird und/oder von dieser weg bewegt wird.This embodiment allows removal of the blade from the roller surface when no grinding is taking place, and in particular is coupled to an actuator arrangement of the rollers so that upon engagement and / or disengagement of the rollers the blade is also brought into contact with the blade surface and / or this is moved away.

Die Klinge ist bevorzugt derart angeordnet, dass die Abstreiferkante parallel zur Walzenachse ist, wenn die Klinge die Walzenoberfläche nicht berührt.The blade is preferably arranged such that the wiper edge is parallel to the roll axis when the blade does not touch the roll surface.

Die Klinge ist bevorzugt über seine gesamte Länge in dem Aufnahmebereich aufgenommen. Die elastische Lagerung ist folglich über die gesamte Länge der Klinge ausgebildet.The blade is preferably received over its entire length in the receiving area. The elastic bearing is thus formed over the entire length of the blade.

Alternativ kann die Klinge nur abschnittsweise in dem Aufnahmebereich aufgenommen und/oder die elastische Lagerung nur abschnittsweise über die Länge der Klinge ausgebildet sein. Es versteht sich, dass in einem solchen Fall, in den Bereichen ohne elastische Lagerung, die Klinge, wenn sie die Walzenoberfläche nicht berührt, den Aufnahmebereich ebenfalls nicht berühren darf.Alternatively, the blade can be received only in sections in the receiving area and / or the elastic support may be formed only in sections over the length of the blade. It is understood that in such a case, in the areas without elastic support, the blade, if it does not touch the roll surface, must not touch the receiving area also.

Die Erfindung wird nachfolgend anhand von bevorzugten Ausführungsbeispielen in Verbindung mit den Figuren besser beschrieben. Es zeigen:

Fig. 1
eine schematische Schnittansicht der Walzenmühle gemäss der Erfindung;
Fig. 2
eine schematische Schnittansicht des Abstreifers gemäss einer ersten bevorzugten Ausführungsform der Erfindung; und
Fig. 3
eine schematische Schnittansicht des Abstreifers gemäss einer zweiten bevorzugten Ausführungsform der Erfindung.
The invention will be better described below with reference to preferred embodiments in conjunction with the figures. Show it:
Fig. 1
a schematic sectional view of the roller mill according to the invention;
Fig. 2
a schematic sectional view of the scraper according to a first preferred embodiment of the invention; and
Fig. 3
a schematic sectional view of the scraper according to a second preferred embodiment of the invention.

In der Figur 1 ist schematisch eine Walzenmühle 1 gemäss der vorliegenden Erfindung gezeigt. Die Walzenmühle 1 umfasst ein Gehäuse 2 mit einem Mahlguteinlass, durch den Pfeil 3 angedeutet, und einem Mahlgutauslass 4, durch den Pfeil 4 ebenfalls angedeutet. Im Gehäuse 2 sind zwei bombierte Walzen 5 und 5' angeordnet, welche jeweils um eine Walzenachse 6 bzw. 6' drehbar gelagert sind und mittels eines nicht dargestellten Antriebs gegenläufig antreibbar sind. Die Drehrichtung der Walzen 5 und 5' ist jeweils durch einen Pfeil angedeutet.In the FIG. 1 schematically a roll mill 1 according to the present invention is shown. The roll mill 1 comprises a Housing 2 with a Mahlguteinlass, indicated by the arrow 3, and a Mahlgutauslass 4, also indicated by the arrow 4. In the housing 2, two cambered rollers 5 and 5 'are arranged, which are each mounted rotatably about a roller axis 6 and 6' and are driven in opposite directions by means of a drive, not shown. The direction of rotation of the rollers 5 and 5 'is indicated in each case by an arrow.

Unmittelbar nach einem Mahlspalt 20 ist jeder Walze 5 bzw. 5' ein Abstreifer 7 bzw. 7' zugeordnet. Der Abstreifer 7 der Walze 5 ist in zwei möglichen Varianten gesondert in den Figuren 2 und 3 gezeigt.Immediately after a refining gap 20, each roller 5 or 5 'is associated with a scraper 7 or 7'. The scraper 7 of the roller 5 is in two possible variants separately in the Figures 2 and 3 shown.

Der Abstreifer 7 der Figuren 2 und 3 umfasst eine Klinge 8, welche aus einem flächigen Metallprofil mit einer Länge L, einer Breite B und einer Höhe H ausgebildet ist. Die Längsrichtung der Klinge 8 ist durch den Vektor L angedeutet.The scraper 7 of the Figures 2 and 3 comprises a blade 8, which is formed from a flat metal profile with a length L, a width B and a height H. The longitudinal direction of the blade 8 is indicated by the vector L.

In den Figuren 2 und 3 berührt die Klinge 8 mit einer Abstreiferkante 10, welche spitz ausgeführt ist, eine Walzenoberfläche 9. Die Klinge 8 ist mit einem Winkel α zwischen einer zur Walzenoberfläche 9 am Berührungspunkt der Klinge 8 tangentialen Ebene TE und der Klinge 8 geneigt angeordnet.In the Figures 2 and 3 The blade 8 is inclined at an angle .alpha. between a plane TE tangent to the roller surface 9 at the point of contact of the blade 8 and the blade 8, with a blade edge 8 having a pointed edge.

In der Ausführungsform der Figuren 2 und 3 weist der Absteifer 7 eine Halterung 11 auf, die um eine Achse 13 kippbar angeordnet ist. Die Achse 13 verläuft parallel zur Walzenachse 6 bzw. 6' und bleibt parallel zur Walzenachse 6 bzw. 6', auch wenn die Walzenachse verschoben wird, Z.B. bei einer Schränkung der Walzen.In the embodiment of the Figures 2 and 3 the stiffener 7 has a holder 11 which is arranged tiltable about an axis 13. The axis 13 extends parallel to the roll axis 6 or 6 'and remains parallel to the roll axis 6 or 6', even if the roll axis is displaced, for example, with a setting of the rolls.

Bei der Ausführungsform der Figur 2 umfasst die Halterung 11 einen Aufnahmebereich 12, welcher als Nut 15 mit zwei parallel zueinander verlaufenden Nutwänden 16 und 16' und einem senkrecht dazu verlaufenden Nutboden 17, die sich in Längsrichtung L der Klinge 8 (und somit der Halterung 11) erstrecken. Die Klinge 8 ist in der Nut 15 angeordnet und berührt mit dem der Abstreiferkante abgewandten Ende den Nutboden 17. An beiden Seiten der Klinge 8 ist zwischen der jeweiligen Nutwand 16 bzw. 16' und der Klinge ein Elastomerstreifen 14 angeordnet, so dass die Klinge 8 in der Nut 15 eine gewisse Bewegungsfreiheit geniesst und insbesondere durch ein Biegemoment parallel zur Höhe der Klinge 8 gebogen und sich an die Bombierung der Walze 5 anpassen kann.In the embodiment of the FIG. 2 For example, the holder 11 comprises a receiving region 12, which serves as a groove 15 with two parallel to one another extending groove walls 16 and 16 'and a groove bottom 17 extending perpendicular thereto extending in the longitudinal direction L of the blade 8 (and thus the holder 11). The blade 8 is arranged in the groove 15 and contacts the groove bottom 17 with the end facing away from the wiper edge. On both sides of the blade 8 an elastomer strip 14 is arranged between the respective groove wall 16 or 16 'and the blade, so that the blade 8 in the groove 15 enjoys a certain freedom of movement and in particular bent by a bending moment parallel to the height of the blade 8 and can adapt to the crowning of the roller 5.

Mit FH wird die freie Höhe der Klinge 8 bezeichnet, welche der Höhe der Klinge 8, die nicht zwischen den Elastomerstreifen 14 angeordnet ist, entspricht.With FH, the free height of the blade 8 is referred to, which corresponds to the height of the blade 8, which is not disposed between the elastomeric strip 14.

Damit die Klinge 8 gegen die Walzenoberfläche 9 gepresst werden kann ist die Halterung 11, wie oben bereits erläutert, um die Achse 13 kippbar angeordnet. Zudem umfasst die Halterung ein Gegengewicht 19, welches durch Hebelwirkung das Kippen der Halterung 11 und das Anpressen der Klinge 8 gegen die Walzenoberfläche 9 bewirkt.So that the blade 8 can be pressed against the roller surface 9, the holder 11, as already explained above, arranged tiltable about the axis 13. In addition, the holder comprises a counterweight 19, which causes by leveraging the tilting of the holder 11 and the pressing of the blade 8 against the roller surface 9.

Der in der Figur 3 dargestellte Abstreifer 7 entspricht im Aufbau im Wesentlichen dem Abstreifer 7 der Figur 2 mit dem Unterschied, dass die Klinge 8 und die Elastomerstreifen 14 in ein Klemmprofil 18 angeordnet sind, wobei das Klemmprofil 18 in dem Aufnahmebereich 12 der Halterung 11 eingesteckt ist.The Indian FIG. 3 shown scraper 7 corresponds in construction essentially the scraper 7 of FIG. 2 with the difference that the blade 8 and the elastomer strips 14 are arranged in a clamping profile 18, wherein the clamping profile 18 is inserted in the receiving region 12 of the holder 11.

Das Klemmprofil 18 ist als Kunststoffprofil ausgebildet und weist zwei parallel zueinander verlaufende Profilwände 160 und 160' und einen senkrecht dazu verlaufenden Profilboden 170 auf, welche in ihrer Funktion den Nutwänden 16 bzw. 16' sowie dem Nutboden 17 entsprechen.The clamping profile 18 is formed as a plastic profile and has two mutually parallel profile walls 160 and 160 'and a perpendicular thereto profile bottom 170 which correspond in function to the groove walls 16 and 16' and the groove bottom 17.

Das Klemmprofil 18 vereinfacht das Platzieren der Klinge 8 mit den Elastomerstreifen 14 in den Aufnahmebereich 12.The clamping profile 18 simplifies the placing of the blade 8 with the elastomer strip 14 in the receiving area 12th

Claims (13)

Walzenmühle (1) umfassend ein Gehäuse (2) mit einem Mahlguteinlass (3), wenigstens einem Mahlgutauslass (4) und wenigstens zwei bombierten Walzen (5, 5'), welche jeweils drehbar um eine Walzenachse (6) im Gehäuse (2) angeordnet sind, wobei wenigstens einer Walze (5) ein Abstreifer (7) zugeordnet ist, dadurch gekennzeichnet, dass der Abstreifer (7) - eine Klinge (8) aufweist zum Abstreifen von Mahlgut von einer Walzenoberfläche (9) mit einer Abstreiferkante (10), welche sich über die gesamte Länge (L) der Klinge (8) erstreckt, und - eine Halterung (11) mit einem Aufnahmebereich (12) umfasst, wobei die Halterung um eine Achse (13) parallel zur Walzenachse kippbar im Gehäuse (2) angeordnet ist, und wobei zwischen der Klinge (8) und dem Aufnahmebereich (12) eine elastische Lagerung (14) angeordnet ist. Roll mill (1) comprising a housing (2) with a Mahlguteinlass (3), at least one Mahlgutauslass (4) and at least two cambered rollers (5, 5 '), each rotatably arranged about a roll axis (6) in the housing (2) wherein at least one roller (5) is associated with a scraper (7), characterized in that the scraper (7) - A blade (8) for stripping regrind of a roll surface (9) with a scraper edge (10) which extends over the entire length (L) of the blade (8), and - A holder (11) with a receiving area (12), wherein the holder about an axis (13) parallel to the roll axis tiltably in the housing (2) is arranged, and wherein between the blade (8) and the receiving area (12) a elastic bearing (14) is arranged. Walzenmühle (1) nach Anspruch 1, dadurch gekennzeichnet, dass der Aufnahmebereich (12) als Nut (15) ausgebildet ist, wobei wenigstens zwischen einer Nutwand (16) und der Klinge (8) eine elastische Lagerung (14) angeordnet ist.Roller mill (1) according to claim 1, characterized in that the receiving region (12) is formed as a groove (15), wherein at least between a groove wall (16) and the blade (8) an elastic bearing (14) is arranged. Walzenmühle (1) nach Anspruch 2, dadurch gekennzeichnet, dass zwischen der Klinge (8) und beiden Nutwänden (16, 16') eine elastische Lagerung (14) angeordnet ist.Roll mill (1) according to claim 2, characterized in that between the blade (8) and both groove walls (16, 16 ') an elastic bearing (14) is arranged. Walzenmühle (1) nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Klinge (8) an einem Nutboden (17) anliegt.Roller mill (1) according to claim 2 or 3, characterized in that the blade (8) rests against a groove bottom (17). Walzenmühle (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Klinge (8) und die elastisehe Lagerung (14) in einem Klemmprofil (18) gehalten sind, welchee in dem Aufnahmebereich (12) angeordnet ist.Roll mill (1) according to one of the preceding claims, characterized in that the blade (8) and the elastisehe Storage (14) are held in a clamping profile (18) which is arranged in the receiving area (12). Walzenmühle nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Klinge (8) ein Verhältnis zwischen der Länge (L) und Breite (B) von 1.6:1 bis 300:1 aufweist.Roll mill according to one of the preceding claims, characterized in that the blade (8) has a ratio between the length (L) and width (B) of 1.6: 1 to 300: 1. Walzenmühle (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Klinge (8) ein Verhältnis zwischen der Höhe (H) und der freien Höhe (FH) von 1:1 bis 6:1 aufweist.Roller mill (1) according to one of the preceding claims, characterized in that the blade (8) has a ratio between the height (H) and the free height (FH) of 1: 1 to 6: 1. Walzenmühle (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Klinge () mit einem Winkel (α) zwischen 20° und 75°, bevorzugt zwischen 30° und 60°, besonders bevorzugt zwischen 30° und 50° zur Walzenoberfläche (9) angeordnet ist.Roll mill (1) according to one of the preceding claims, characterized in that the blade (14) is at an angle (α) between 20 ° and 75 °, preferably between 30 ° and 60 °, particularly preferably between 30 ° and 50 ° to the roll surface ( 9) is arranged. Walzenmühle (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die elastische Lagerung (14) als Elastomerstreifen mit einer Shore OO Härte zwischen 15 und 100, vorzugsweise zwischen 30 und 90, besonders bevorzugt zwischen 40 und 80 ausgebildet ist.Roll mill (1) according to one of the preceding claims, characterized in that the elastic bearing (14) is formed as an elastomer strip having a Shore OO hardness between 15 and 100, preferably between 30 and 90, particularly preferably between 40 and 80. Walzenmühle (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Halterung mit einem Gegengewicht (19) versehen ist, mittels welchem die Klinge (8) um die Achse (13) kippbar und gegen die Walzenoberfläche (9) pressbar ist.Roller mill (1) according to one of the preceding claims, characterized in that the holder is provided with a counterweight (19), by means of which the blade (8) about the axis (13) tiltable and against the roller surface (9) can be pressed. Walzenmühle (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Abstreifer (7) mit einer Abhebevorrichtung in Wirkverbindung steht, mittels welcher die Klinge (8) um die Achse (13) kippbar und von der Walzenoberfläche (9) weg bewegbar ist.Roller mill (1) according to one of the preceding claims, characterized in that the scraper (7) is in operative connection with a lifting device, by means of which the blade (8) is tiltable about the axis (13) and movable away from the roller surface (9). Walzenmühle (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Klinge (8) derart angeordnet ist, dass die Abstreiferkante (10) parallel zur Walzenachse () ist, wenn die Klinge (8) die Walzenoberfläche nicht berührt.Roll mill (1) according to one of the preceding claims, characterized in that the blade (8) is arranged such that the wiper edge (10) is parallel to the roll axis (12) when the blade (8) does not touch the roll surface. Walzenmühle (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Klinge (8) über seine gesamte Länge (L) in dem Aufnahmebereich (12) aufgenommen ist.Roll mill (1) according to one of the preceding claims, characterized in that the blade (8) is received over its entire length (L) in the receiving area (12).
EP18174238.8A 2018-05-25 2018-05-25 Roller mill with a scraper Active EP3572153B1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
EP18174238.8A EP3572153B1 (en) 2018-05-25 2018-05-25 Roller mill with a scraper
ES18174238T ES2823028T3 (en) 2018-05-25 2018-05-25 Roller mill with a scraper
CN201980046406.4A CN112423889A (en) 2018-05-25 2019-05-27 Roller mill with scraper
JP2020565877A JP6980135B2 (en) 2018-05-25 2019-05-27 Roller mill with scraper
KR1020207036746A KR102318276B1 (en) 2018-05-25 2019-05-27 roller grinder with scraper
PCT/EP2019/063624 WO2019224395A1 (en) 2018-05-25 2019-05-27 Roller mill with a scraper
AU2019272925A AU2019272925B2 (en) 2018-05-25 2019-05-27 Roller mill with a scraper
BR112020023605-5A BR112020023605B1 (en) 2018-05-25 2019-05-27 CYLINDER MILL WITH A SCRAPER
MX2020012565A MX2020012565A (en) 2018-05-25 2019-05-27 Roller mill with a scraper.
CA3101384A CA3101384C (en) 2018-05-25 2019-05-27 Roller mill with a scraper
RU2020142827A RU2754044C1 (en) 2018-05-25 2019-05-27 Roller mill with scraper
US17/058,423 US11618034B2 (en) 2018-05-25 2019-05-27 Roller mill with a scraper

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Application Number Priority Date Filing Date Title
EP18174238.8A EP3572153B1 (en) 2018-05-25 2018-05-25 Roller mill with a scraper

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EP3572153A1 true EP3572153A1 (en) 2019-11-27
EP3572153B1 EP3572153B1 (en) 2020-08-05

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EP (1) EP3572153B1 (en)
JP (1) JP6980135B2 (en)
KR (1) KR102318276B1 (en)
CN (1) CN112423889A (en)
AU (1) AU2019272925B2 (en)
BR (1) BR112020023605B1 (en)
CA (1) CA3101384C (en)
ES (1) ES2823028T3 (en)
MX (1) MX2020012565A (en)
RU (1) RU2754044C1 (en)
WO (1) WO2019224395A1 (en)

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AU2019272925A1 (en) 2020-12-17
KR20210005286A (en) 2021-01-13
ES2823028T3 (en) 2021-05-05
RU2754044C1 (en) 2021-08-25
EP3572153B1 (en) 2020-08-05
JP6980135B2 (en) 2021-12-15
US11618034B2 (en) 2023-04-04
JP2021514836A (en) 2021-06-17
WO2019224395A1 (en) 2019-11-28
KR102318276B1 (en) 2021-10-27
BR112020023605B1 (en) 2021-09-21
US20210213456A1 (en) 2021-07-15
BR112020023605A8 (en) 2021-08-17
MX2020012565A (en) 2021-10-26
CA3101384A1 (en) 2019-11-28
CN112423889A (en) 2021-02-26
CA3101384C (en) 2021-07-06
BR112020023605A2 (en) 2021-02-09

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