EP0040432B1 - Scraper blade for rollers, in particular for rollers of a roller mill used in milling - Google Patents

Scraper blade for rollers, in particular for rollers of a roller mill used in milling Download PDF

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Publication number
EP0040432B1
EP0040432B1 EP81103852A EP81103852A EP0040432B1 EP 0040432 B1 EP0040432 B1 EP 0040432B1 EP 81103852 A EP81103852 A EP 81103852A EP 81103852 A EP81103852 A EP 81103852A EP 0040432 B1 EP0040432 B1 EP 0040432B1
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EP
European Patent Office
Prior art keywords
knife
rollers
scraper
roller
bar
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Expired
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EP81103852A
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German (de)
French (fr)
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EP0040432A1 (en
Inventor
Robert Linzberger
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
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Buehler AG
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Publication date
Priority claimed from DE19803023824 external-priority patent/DE3023824C2/en
Application filed by Buehler AG filed Critical Buehler AG
Publication of EP0040432A1 publication Critical patent/EP0040432A1/en
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Publication of EP0040432B1 publication Critical patent/EP0040432B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/40—Detachers, e.g. scrapers

Definitions

  • the invention relates to knife scrapers for rollers, in particular for rollers of a milling roller mill, with a pivotable knife bar receiving the knife, over the length of which several mechanical tensioning elements connected to the knife bar are provided, by means of which the protruding from the knife bar with little elastic bending Knife surface the cutting edge of the knife can be pressed against the roller.
  • a knife wiper is e.g. B. from GB-A-204959.
  • Knife scrapers are used on roller mills, especially in the milling industry, as auxiliary elements which are of great importance for the operational safety of the roller mills.
  • the knife scrapers it is necessary that the knife scrapers always keep the rollers free of adhering flour particles in order to prevent the ground material from sticking to the rollers. can wind up Agriculture Because locally adhering product leads to a change in the grinding conditions and harbors the risk that rollers can be damaged during the grinding process.
  • a safe function of the knife wipers used is therefore very important in the interest of the proper working of the entire roller mill, which is why such knife wipers also have to be continuously monitored and adjusted.
  • One of the main disadvantages of previous knife scrapers is an uncomfortable setting of the knives. Because, as a rule, the knives have to be adjusted by hand after grinding the rollers and when inserting new knives. Each knife is set very precisely in the manner of a straightedge by means of a counterweight. If a good setting does not succeed immediately, then the knife is often forced to fit the rollers better with additional weights, etc., and the disadvantages resulting from this are accepted.
  • lever arms are provided over the length of the knife holder, whereby these lever arms can be regarded as bracing elements, since each such lever arm can be adjusted at least in one direction (independently of the other such levers) by means of an associated hand setting wheel: this means that over each each lever locally a more or less strong bending of the cutter bar can be effected and this also in the event that the two other lever arms lying laterally next to a lever arm have a different position.
  • the individual adjustment wheels can be used to apply bending or tensioning of the cutter bar in one direction with a certain independence from one another.
  • the setting levers have a groove open on one side for engagement with the associated setting wheel, they can only be subjected to tension in one direction towards the closed end of the groove by the setting wheel in question, and accordingly only bending in this direction is possible.
  • the knife bar cannot be bent in the other direction via the relevant lever.
  • Another disadvantage of this known solution is that it has a rather complicated structure and nevertheless, because of the shown flexibility of the cutter bar in only one direction, whose completely independent adjustability over the width of the cutter bar is not guaranteed.
  • the object of the invention is to develop a knife scraper of the type mentioned at the outset, in which the disadvantages of the abovementioned solutions are avoided as far as possible and are particularly convenient and inexpensive to manufacture with little construction effort quick adjustment of the knife is possible.
  • the knife should also be designed to be self-adjusting in normal operation.
  • the bracing elements comprise a continuous counterweight which is connected to the knife bar via at least three clamping screws arranged approximately transversely to the knife surface.
  • the knife scraper according to the invention makes it possible that even less experienced operators can immediately set the knife scraper very precisely.
  • the knife scraper according to the invention allows both an adaptation of the shape of the knife to the local roller contour and a pressing of the knife to generate a scraping force, the two functions being influenced separately or being able to be influenced separately.
  • the measures according to the invention moreover make it much easier to adapt the knife to the shape of the associated roller than in the case of conventional knife scrapers.
  • the knife is advantageously assigned adjusting screws which support the knife in the direction of the knife surface (and in the direction of the knife edge).
  • a particularly easy replacement of the knife can be achieved in that the knife is loosely inserted in the receiving groove of the knife bar and is preferably supported in the direction of the groove width by means of a chuck, such as a flat filler rod.
  • the counterweight is preferably displaceable on the clamping screws relative to the cutter bar.
  • the knife area protruding from the knife bar protrudes only slightly and the knife area is essentially bent within the knife bar by a corresponding bending thereof via the bracing elements.
  • a grinding roller 1 is shown only partially and a further grinding roller 1 'is only hinted at.
  • each roller 1, 1 ' is assigned its own knife scraper 2 (each mirror image of one another).
  • a knife 3 with a cutting edge 4 is loosely inserted into a milled receiving groove 6 of a knife bar 5, the knife 3 resting on one side on one side surface of the milling in the knife bar and held in position by a chuck 7 which is also loosely inserted.
  • the cutter bar 5 is rotatably supported on both end sides by means of pins 8 so that it can carry out a small pivoting movement.
  • the cutting direction of the knife 3 is given with the coordinate «S».
  • the knife bar 5 is relatively large, viewed in the cutting direction “S” of the knife 3, with respect to its width “B”. Seen in the cutting direction “S”, the cutter bar 5 is still very rigid, and on its width “B, again in the cutting direction S, two set screws 9 are attached over the entire length of the cutter bar 5, each by a lock nut 10 for unwanted purposes Are secured.
  • the center of the counterweight 12 (cf. FIG. 2) can be set to a desired distance A from the pin 8 and the desired contact pressure of the cutting edge 4 of the knife 3 against the roller 1 can be achieved will.
  • the cutting edge 4 of the knife 3 continuously contacts the roller 1 with a force corresponding to the given leverage ratios and cleans the roller of adhering flour or grain parts.
  • the knife 3 is set after the entire unit has been assembled as follows:
  • z. B. generated by a lamp, light, whereby a possibly existing gap X can be recognized very quickly and very accurately by the operator or adjuster.
  • the lock nut 13 and the wing nut 14 By adjusting the lock nut 13 and the wing nut 14, the locally occurring gap X can be eliminated by appropriately tightening or bending the cutter bar 5 or the thin cutter 3.
  • three dash-dotted lines 0, P and Q are shown in FIG. 2 in order to outline three possibilities for a change in shape of the knife that occurs.
  • the knife 3 can be tilted to a certain extent in the cutting direction by the wing nuts 9. If the two different setting options in the knife wiper shown in the serve significantly different functions, it is nevertheless advisable to first align the knife 3 in the cutting direction “S”, ie by adjusting one or both adjusting screws 9, as precisely as possible, and only then using the tensioning elements 11, 12, 13, 14 and 15 Precise adjustment of the knife edge 4.
  • the cutter bar 5 is preferably made of a relatively elastic material, e.g. B. aluminum, the counterweight 12, on the other hand, which should also be a support for the bracing elements, preferably made of steel. The use of three clamping screws is very useful, but more than three screws can be used distributed over the length of the knife.
  • the cutter bar 5 which can have a relatively large length of approximately 1 m, can be elastically clamped with only a small force in the transverse direction by only a few tenths of a millimeter or even by a few millimeters, while the cutter 3 is set in the cutting direction and after the scraper has been fully adjusted can be left to the game of forces of the counterweight 12 set for the specific application.
  • the knife 3 is applied to the entire length of the grinding roller 1 with the desired force.
  • An advantageous embodiment of a knife scraper according to the invention can also consist in that the knife surface protruding beyond the knife bar is only relatively short, e.g. B. only 1-2 centimeters long, compared to their depth in the holder of the cutter bar itself and at the same time by the clamping elements essentially the cutter bar (and thereby also the knife surface contained in it) bends.
  • the knife region protruding from the knife bar becomes relatively rigid and there is no risk of undesired knife flutter occurring, while the desired knife bending takes place mainly within the knife bar.
  • the protruding area of the knife is then only slightly bent by its pressure on the roller. With such an embodiment, even with particularly thin knives, the success desired according to the invention can be achieved without impairment.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Crushing And Grinding (AREA)

Description

Die Erfindung bezieht sich auf Messerabstreifer für Walzen, insbesondere für Walzen eines Müllerei-Walzenstuhles, mit einem das Messer aufnehmenden verschwenkbaren Messerbalken, über dessen Länge verteilt mehrere mit dem Messerbalken verbundene mechanische Verspannelemente vorgesehen sind, mittels derer unter geringer elastischer Verbiegung der aus dem Messerbalken überstehenden Messerfläche die Schneide des Messers gegen die Walze andrückbar ist. Ein solcher Messerabstreifer ist z. B. aus GB-A-204959 bekannt.The invention relates to knife scrapers for rollers, in particular for rollers of a milling roller mill, with a pivotable knife bar receiving the knife, over the length of which several mechanical tensioning elements connected to the knife bar are provided, by means of which the protruding from the knife bar with little elastic bending Knife surface the cutting edge of the knife can be pressed against the roller. Such a knife wiper is e.g. B. from GB-A-204959.

Messerabstreifer werden an Walzenstühlen, insbesondere in der Müllerei, als Hilfselemente eingesetzt, die für die Betriebssicherheit der Walzenstühle eine große Bedeutung haben. Für die gewünschte Funktion der Messerabstreifer ist es von Wichtigkeit, daß jeder Messerabstreifer über die gesamte Länge seiner Schneide gut an der Walze anliegt und gleichzeitig dennoch mit nur kleiner Kraft an sie angepreßt wird. Insbesondere bei Glattwalzen, wie sie für die Ausmahlung von Getreideprodukten zur Erzeugung von Dunst und Mehl usw. eingesetzt werden, ist es erforderlich, daß die Messerabstreifer die Walzen stets von anhaftenden Mehlpartikeln freihalten, um dadurch zu verhindern, daß sich das Mahlgut auf den Walzen « aufwickeln » kann. Denn örtlich anhaftendes Produkt führt zu einer Veränderung der Mahlverhältnisse und birgt die Gefahr in sich, daß dadurch Walzen beim Mahlprozeß beschädigt werden können. Eine sichere Funktion der eingesetzten Messerabstreifer ist daher im Interesse eines ordnungsgemäßen Arbeitens des ganzen Walzenstuhles sehr wichtig, weshalb solche Messerabstreifer auch laufend betreut und nachgestellt werden müssen. Einer der wesentlichen Nachteile bisheriger Messerabstreifer liegt in einer unbequemen Einstellung der Messer. Denn in der Regel müssen die Messer nach einem Überschleifen der Walzen und beim Einsetzen neuer Messer von Hand eingestellt werden. Dabei wird in üblicher Weise jedes Messer in Art eines Haarlineals mittels Gegengewicht sehr genau eingestellt. Gelingt eine gute Einstellung nicht sogleich, dann wird vielfach mit Zusatzgewichten usw. ein besseres Anliegen des Messers an die Walzen erzwungen und die sich hieraus ergebenden Nachteile in Kauf genommen.Knife scrapers are used on roller mills, especially in the milling industry, as auxiliary elements which are of great importance for the operational safety of the roller mills. For the desired function of the knife wipers, it is important that each knife wiper lies well against the roller over the entire length of its cutting edge and at the same time is pressed against it with only a small force. Particularly in the case of smooth rollers, such as those used for grinding cereal products to produce haze and flour, etc., it is necessary that the knife scrapers always keep the rollers free of adhering flour particles in order to prevent the ground material from sticking to the rollers. can wind up ». Because locally adhering product leads to a change in the grinding conditions and harbors the risk that rollers can be damaged during the grinding process. A safe function of the knife wipers used is therefore very important in the interest of the proper working of the entire roller mill, which is why such knife wipers also have to be continuously monitored and adjusted. One of the main disadvantages of previous knife scrapers is an uncomfortable setting of the knives. Because, as a rule, the knives have to be adjusted by hand after grinding the rollers and when inserting new knives. Each knife is set very precisely in the manner of a straightedge by means of a counterweight. If a good setting does not succeed immediately, then the knife is often forced to fit the rollers better with additional weights, etc., and the disadvantages resulting from this are accepted.

Bei einem bekannten Messerabstreifer (CH-A-316 484) werden von einem Stützrohr aus, das mit einer Hydraulikflüssigkeit gefüllt ist, eine Anzahl Preßkolben gegen den Messerbalken angedrückt. Da auch bei genauer Fertigung aller Einzelelemente dieser bekannten Anordnung ebenso wie bei deren präzisem Zusammenbau stets mit dem Auftreten eines gewissen Leckverlustes an Hydraulikflüssigkeit gerechnet werden muß, ist ein ständiges Nachstellen erforderlich, weshalb sich diese Anordnung für den Einsatz bei Müllereiwalzwerken nicht eignet. Ein individuelles Einstellen der Messer von Hand ist bei der vorbekannten Lösung überhaupt nicht mehr möglich. Um das Messer auf der ganzen Länge seiner Schneide in gute Anlage zu bringen, kann nur der Druck auf alle Preßkolben gleichzeitig erhöht werden, was die Gefahr relativ großer einseitiger Abnutzug des Messers mit sich bringt.In a known knife scraper (CH-A-316 484), a number of plungers are pressed against the knife bar from a support tube which is filled with a hydraulic fluid. Since even with precise manufacture of all individual elements of this known arrangement as well as with their precise assembly, a certain leakage loss of hydraulic fluid must always be expected, constant readjustment is necessary, which is why this arrangement is not suitable for use in milling rolling mills. An individual adjustment of the knives by hand is no longer possible with the previously known solution. In order to bring the knife into good contact over the entire length of its cutting edge, only the pressure on all plungers can be increased at the same time, which entails the risk of relatively large one-sided wear of the knife.

Bei einem anderen vorbekannten Messerabstreifer (CH-A-328 826) wird ebenfalls der Messerbalken über einzelne Hydraulikelemente in Schneidrichtung des Messers angedrückt. Aber auch diese Lösung ist für Müllereiwalzwerke ungeeignet. In beiden aufgezeigten vorbekannten Fällen sind verhältnismäßig große bauliche Aufwendungen erforderlich, wobei sich dennoch eine für Müllereiwalzwerke nicht ausreichend befriedigende Funktionsweise ergibt. Ein weiterer vorbekannter Messerabstreifer der eingangs genannten Art (GB-A-204 959) weist ebenfalls bereits einen Messerhalter auf, der um eine Achse drehbar bzw. verschwenkbar und damit gegen die Walze anlegbar angeordnet ist. Eine Vielzahl von Hebelarmen ist über die Länge des Messerhalters vorgesehen, wobei diese Hebelarme als Verspannelemente angesehen werden können, da jeder solcher Hebelarm über ein zugehöriges Handeinstellrad zumindest in einer Richtung (unabhängig von den anderen solchen Hebeln) verstellbar ist : dies bedeutet, daß über jeden einzelnen Hebel jeweils örtlich eine mehr oder weniger starke Verbiegung des Messerbalkens bewirkt werden kann und dies auch für den Fall, daß die beiden seitlich neben einem Hebelarm liegenden beiden anderen Hebelarme eine andere Stellung aufweisen. Hierdurch ist bei dieser vorbekannten Lösung mittels der einzelnen Einstellräder mit einer gewissen Unabhängigkeit voneinander das Aufbringen von Verbiegungen bzw. Verspannungen des Messerbalkens in einer Richtung möglich. Da die Einstellhebel jedoch zum Eingriff mit dem zugehörigen Einstellrad eine einseitig offene Nut aufweisen, können sie von dem betreffenden Einstellrad nur in eine Richtung auf das geschlossene Nutende hin mit Zug beaufschlagt werden und entsprechend ist auch nur eine Verbiegung in dieser Richtung möglich. Eine Verbiegung des Messerbalkens über den betreffenden Hebel in die andere Richtung kann allerdings nicht erfolgen. Als ebenfalls nachteilig wird bei dieser vorbekannten Lösung empfunden, daß sie einen ziemlich komplizierten Aufbau aufweist und trotzdem, wegen der aufgezeigten Biegbarkeit des Messerbalkens nur in einer Richtung, dessen vollständig unabhängige Einstellbarkeit über die Breite des Messerbalkens hinweg nicht gewährleistet ist.In another known knife scraper (CH-A-328 826) the knife bar is also pressed in the cutting direction of the knife via individual hydraulic elements. But this solution is also unsuitable for mill rolling mills. In both of the previously known cases shown, comparatively large structural expenditures are required, although the functioning is not satisfactory for milling mill mills. Another known knife scraper of the type mentioned at the outset (GB-A-204 959) also already has a knife holder which can be rotated or pivoted about an axis and can therefore be placed against the roller. A large number of lever arms are provided over the length of the knife holder, whereby these lever arms can be regarded as bracing elements, since each such lever arm can be adjusted at least in one direction (independently of the other such levers) by means of an associated hand setting wheel: this means that over each each lever locally a more or less strong bending of the cutter bar can be effected and this also in the event that the two other lever arms lying laterally next to a lever arm have a different position. As a result, in this known solution, the individual adjustment wheels can be used to apply bending or tensioning of the cutter bar in one direction with a certain independence from one another. However, since the setting levers have a groove open on one side for engagement with the associated setting wheel, they can only be subjected to tension in one direction towards the closed end of the groove by the setting wheel in question, and accordingly only bending in this direction is possible. However, the knife bar cannot be bent in the other direction via the relevant lever. Another disadvantage of this known solution is that it has a rather complicated structure and nevertheless, because of the shown flexibility of the cutter bar in only one direction, whose completely independent adjustability over the width of the cutter bar is not guaranteed.

Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, einen Messerabstreifer der eingangs genannten Art zu entwickeln, bei dem die Nachteile der vorstehend genannten Lösungen weitestgehend vermieden und bei geringem baulichem Aufwand sowie preisgünstiger Herstellbarkeit eine besonders bequeme und schnelle Einstellung des Messers möglich ist. Überdies soll auch das Messer in Normalbetrieb selbstnachstellend ausgebildet sein.Proceeding from this, the object of the invention is to develop a knife scraper of the type mentioned at the outset, in which the disadvantages of the abovementioned solutions are avoided as far as possible and are particularly convenient and inexpensive to manufacture with little construction effort quick adjustment of the knife is possible. In addition, the knife should also be designed to be self-adjusting in normal operation.

Erfindungsgemäß wird dies bei einem Messerabstreifer der eingangs genannten Art dadurch erreicht, daß die Verspannelemente ein durchgehendes Gegengewicht umfassen, das über mindestens drei etwa quer zur Messerfläche angeordnete Spannschrauben mit dem Messerbalken verbunden ist. Der erfindungsgemäße Messerabstreifer ermöglicht es, daß selbst weniger geübte Bedienungspersonen sogleich den Messerabstreifer sehr genau einstellen können. Der erfindungsgemäße Messerabstreifer läßt dabei sowohl eine Anpassung der Form des Messers an die örtliche Walzenkontur zu, wie auch ein Anpressen des Messers zur Erzeugung einer Abschabkraft, wobei beide Funktionen getrennt voneinander beeinflußt bzw. getrennt beeinflußbar sind. Durch die erfindungsgemäßen Maßnahmen läßt sich überdies das Messer viel leichter als bei herkömmlichen Messerabstreifern an die Form der zugeordneten Walze anpassen. Vorteilhafterweise sind bei einem erfindungsgemäßen Messerabstreifer dem Messer Stellschrauben zugeordnet, die das Messer in Richtung der Messerfläche (und in Richtung zur Messerkante hin) abstützen.According to the invention, this is achieved with a knife scraper of the type mentioned at the outset in that the bracing elements comprise a continuous counterweight which is connected to the knife bar via at least three clamping screws arranged approximately transversely to the knife surface. The knife scraper according to the invention makes it possible that even less experienced operators can immediately set the knife scraper very precisely. The knife scraper according to the invention allows both an adaptation of the shape of the knife to the local roller contour and a pressing of the knife to generate a scraping force, the two functions being influenced separately or being able to be influenced separately. The measures according to the invention moreover make it much easier to adapt the knife to the shape of the associated roller than in the case of conventional knife scrapers. In the case of a knife scraper according to the invention, the knife is advantageously assigned adjusting screws which support the knife in the direction of the knife surface (and in the direction of the knife edge).

Ein besonders leichtes Auswechseln des Messers läßt sich dadurch erreichen, daß das Messer in die Aufnahmenut des Messerbalkens lose eingelegt und vorzugsweise mittels eines Futters, etwa eines flachen Füllstabs, in Richtung der Nutbreite abgestützt ist.A particularly easy replacement of the knife can be achieved in that the knife is loosely inserted in the receiving groove of the knife bar and is preferably supported in the direction of the groove width by means of a chuck, such as a flat filler rod.

Weiterhin vorzugsweise ist das Gegengewicht relativ zum Messerbalken auf den Spannschrauben verschiebbar.Furthermore, the counterweight is preferably displaceable on the clamping screws relative to the cutter bar.

In weiterer vorteilhafter Ausgestaltung des erfindungsgemäßen Messerabstreifers steht die aus dem Messerbalken überstehende Messerfläche nur wenig über und es erfolgt die Verbiegung der Messerfläche im wesentlichen innerhalb des Messerbalkens durch eine entsprechende Verbiegung desselben über die Verspannelemente.In a further advantageous embodiment of the knife scraper according to the invention, the knife area protruding from the knife bar protrudes only slightly and the knife area is essentially bent within the knife bar by a corresponding bending thereof via the bracing elements.

Die Erfindung wird nachfolgend anhand der Zeichnung im Prinzip beispielshalber erläutert. Es zeigen :

  • Figur 1 eine Seitenansioht eines erfindungsgemäßen Messerabstreifers ;
  • Figur 2 einen Grundriß eines erfindungsgemäßen Messerabstreifers.
The invention is explained below in principle by way of example with reference to the drawing. Show it :
  • 1 shows a side view of a knife wiper according to the invention;
  • Figure 2 is a plan view of a knife wiper according to the invention.

In Figur 1 ist eine Mahlwalze 1 nur teilweise und eine weitere Mahlwalze 1' nur in Andeutung dargestellt. In der Regel ist jeder Walze 1, 1' ein eigener Messerabstreifer 2 (jeweils spiegelbildlich zueinander) zugeordnet. Ein Messer 3 mit einer Schneide 4 ist lose in eine eingefräste Aufnahmenut 6 eines Messerbalkens 5 eingelegt, wobei das Messer 3 einseitig an der einen Seitenfläche der Einfräsung im Messerbalken anliegt und durch ein Futter 7, das ebenfalls lose eingelegt ist, in Position gehalten wird. Lediglich seitlich befindet sich noch ein kleiner (nicht dargestellter) Anschlag, der das Messer 3 gegen seitliches Wegrutschen sichert. Der Messerbalken 5 ist auf beiden Endseiten mittels Zapfen 8 drehbeweglich gelagert, so daß er eine kleine Schwenkbewegung ausführen kann.In Figure 1, a grinding roller 1 is shown only partially and a further grinding roller 1 'is only hinted at. As a rule, each roller 1, 1 'is assigned its own knife scraper 2 (each mirror image of one another). A knife 3 with a cutting edge 4 is loosely inserted into a milled receiving groove 6 of a knife bar 5, the knife 3 resting on one side on one side surface of the milling in the knife bar and held in position by a chuck 7 which is also loosely inserted. There is only a small stop (not shown) on the side, which secures the knife 3 against slipping sideways. The cutter bar 5 is rotatably supported on both end sides by means of pins 8 so that it can carry out a small pivoting movement.

In Figur 1 ist die Schneidrichtung des Messers 3 mit der Koordinate « S » angegeben. Der Messerbalken 5 ist dabei, in Schneidrichtung « S » des Messers 3 gesehen, bezogen auf seine Breite « B » relativ groß. In Schneidrichtung « S »gesehen ist der Messerbalken 5 weiterhin sehr biegesteif ausgeführt, und auf seiner Breite « B sind, wiederum in Schneidrichtung S gesehen, über die gesamte Länge des Messerbalkens 5 hinweg zwei Stellschrauben 9 angebracht, die je durch eine Kontermutter 10 für ungewolltes Lösen gesichert sind. In einem Winkel, der nicht ganz 90° zur Messerfläche « F beträgt, sind, quer zum Messerbalken 5, mindestens drei Spannschrauben 11 vorgesehen, die gemeinsam ein Gegengewicht 12 tragen. Dieses ist auf den Spannschrauben 11 mittels einer Kontermutter 13 sowie einer Flügelmutter 14 an einem Gewinde 15 der Spannschrauben 11 gesichert. Durch Wahl einer bestimmten Länge der Spannschrauben 11 sowie des Gewindes 15 kann die Mitte des Gegengewichts 12 (vgl. Figur 2) auf einen gewünschten Abstand A zu den Zapfen 8 eingestellt und so die gewünschte Anpreßkraft der Schneide 4 des Messers 3 gegen die Walze 1 erzielt werden.In Figure 1, the cutting direction of the knife 3 is given with the coordinate «S». The knife bar 5 is relatively large, viewed in the cutting direction “S” of the knife 3, with respect to its width “B”. Seen in the cutting direction “S”, the cutter bar 5 is still very rigid, and on its width “B, again in the cutting direction S, two set screws 9 are attached over the entire length of the cutter bar 5, each by a lock nut 10 for unwanted purposes Are secured. At an angle that is not quite 90 ° to the knife surface “F, at least three clamping screws 11 are provided transversely to the knife bar 5, which together carry a counterweight 12. This is secured on the clamping screws 11 by means of a lock nut 13 and a wing nut 14 on a thread 15 of the clamping screws 11. By choosing a certain length of the clamping screws 11 and the thread 15, the center of the counterweight 12 (cf. FIG. 2) can be set to a desired distance A from the pin 8 and the desired contact pressure of the cutting edge 4 of the knife 3 against the roller 1 can be achieved will.

Bei Betrieb legt sich die Schneide 4 des Messers 3 mit einer den gegebenen Hebelverhältnissen entsprechenden Kraft andauernd an die Walze 1 an und reinigt die Walze von anhaftendem Mehl bzw. Kornteilen.During operation, the cutting edge 4 of the knife 3 continuously contacts the roller 1 with a force corresponding to the given leverage ratios and cleans the roller of adhering flour or grain parts.

Die Einstellung des Messers 3 geschieht, nachdem die ganze Einheit montiert ist, wie folgt :The knife 3 is set after the entire unit has been assembled as follows:

Auf der dem Auge abgekehrten Seite des Messers 3 wird, z. B. mittels einer Lampe, Licht erzeugt, wodurch ein möglicherweise vorhandener Spalt X sehr schnell und sehr genau von der Bedienungs- bzw. Einstellperson erkannt werden kann. Durch Verstellen der Kontermutter 13 sowie der Flügelmutter 14 kann durch entsprechendes Verspannen bzw. Verbiegen des Messerbalkens 5 bzw. des dünnen Messers 3 der lokal auftretende Spalt X beseitigt werden. In Figur 2 sind beispielshalber drei strichpunktierte Linien 0, P und Q eingezeichnet, um drei Möglichkeiten für eine dabei auftretende Formänderung des Messers zu skizzieren.On the side of the knife 3 facing away from the eye, z. B. generated by a lamp, light, whereby a possibly existing gap X can be recognized very quickly and very accurately by the operator or adjuster. By adjusting the lock nut 13 and the wing nut 14, the locally occurring gap X can be eliminated by appropriately tightening or bending the cutter bar 5 or the thin cutter 3. For example, three dash-dotted lines 0, P and Q are shown in FIG. 2 in order to outline three possibilities for a change in shape of the knife that occurs.

Für die Einstellung ist dabei völlig unerheblich, weshalb das Messer teilweise nicht anliegt, ob dies auf eine ungenaue Ausrichtung des Messers, eine große Bombierung der Walze oder eine ungenaue Montage des Messerbalkens 5 zurückgeht. In jedem Fall genügen kleine Verstellungen einer oder mehrerer Flügelmuttern 14, um ein Anliegen der Messerschneide 4 über deren ganze Länge an die Walze 1 zu bewirken.For the setting, it is completely irrelevant why the knife is not in part, whether this is due to an inaccurate alignment of the knife, a large crowning of the roller or an inaccurate mounting of the knife bar 5. In any case, small adjustments of one or more wing nuts 14 are sufficient to cause the knife edge 4 to bear against the roller 1 over its entire length.

Kommt der ganze Messerabstreifer im Verhältnis zu der Walze 1, 1' schräg zu liegen, dann kann das Messer 3 bis zu einem bestimmten Maße in Schneidrichtung durch die Flügelmuttern 9 gekippt werden. Wenn auch die beiden voneinander verschiedenen Einstellmöglichkeiten bei dem gezeigten Messerabstreifer im wesentlichen unterschiedlichen Funktionen dienen, so empfiehlt es sich dennoch, zuerst das Messer 3 in Schneidrichtung « S », d. h. durch Verstellen einer oder beider Einstellschrauben 9, möglichst genau auszurichten, und erst dann mittels der Verspannelemente 11, 12, 13, 14 und 15 das Anliegen der Messerschneide 4 genau einzustellen. Bevorzugt wird der Messerbalken 5 aus einem verhältnismäßig elastischem Material, z. B. Aluminium, ausgeführt, das Gegengewicht 12 hingegen, das gleichzeitig auch eine Stütze für die Verspannelemente darstellen soll, vorzugsweise aus Stahl gefertigt. Die Verwendung dreier Spannschrauben ist sehr zweckmäßig, es können jedoch auch mehr als drei über die Länge des Messers hinweg verteilte Schrauben eingesetzt werden.If the entire knife scraper comes to lie obliquely in relation to the roller 1, 1 ', then the knife 3 can be tilted to a certain extent in the cutting direction by the wing nuts 9. If the two different setting options in the knife wiper shown in the serve significantly different functions, it is nevertheless advisable to first align the knife 3 in the cutting direction “S”, ie by adjusting one or both adjusting screws 9, as precisely as possible, and only then using the tensioning elements 11, 12, 13, 14 and 15 Precise adjustment of the knife edge 4. The cutter bar 5 is preferably made of a relatively elastic material, e.g. B. aluminum, the counterweight 12, on the other hand, which should also be a support for the bracing elements, preferably made of steel. The use of three clamping screws is very useful, but more than three screws can be used distributed over the length of the knife.

Es ist weiterhin sehr zweckmäßig, die einzelnen Spannschrauben nicht präzise in einen 90° -Winkel zur Messerfläche F anzuordnen, sondern einen geringen Winkel zur Normalen vorzusehen. Durch die geometrische Formgebung des Messerbalkens 5 ergibt sich durch die Spannschrauben trozdem die gewünschte Wölbung in Längsrichtung der Messerfläche F. Die Verwendung von Flügelmuttern für die Verspannung sowie die Nachstellung des Messers 3 erlaubt es, die Messereinstellung ohne Hilfswerkzeuge mit minimalem Zeitaufwand und großer Präzision durchzuführen. Gleichzeitig ist es möglich, das Messer schon von Anfang an der Bombierung der Walzen 1 anzupassen. Der Messerbalken 5, der eine relativ große Länge von ca. 1 m aufweisen kann, kann mit kleiner Kraft in Querrichtung um nur wenige Zehntel Millimeter oder gar um einige Millimeter elastisch verspannt werden, während das Messer 3 in Schneidrichtung eingestellt und nach vollendeter Einstellung der Abstreifer dem Kräftespiel des auf den spezifischen Anwendungsfall eingestellten Gegengewichtes 12 überlassen werden kann. Das Messer 3 legt sich auf der ganzen Länge der Mahlwalze 1 mit der gewünschten Kraft an.It is also very expedient not to arrange the individual clamping screws precisely at a 90 ° angle to the knife surface F, but to provide a small angle to the normal. Due to the geometrical shape of the cutter bar 5, the tensioning screws still result in the desired curvature in the longitudinal direction of the cutter surface F. The use of wing nuts for the bracing and the adjustment of the cutter 3 allows the cutter to be adjusted without tools and with a minimum of time and great precision. At the same time, it is possible to adapt the knife to the curvature of the rollers 1 right from the start. The cutter bar 5, which can have a relatively large length of approximately 1 m, can be elastically clamped with only a small force in the transverse direction by only a few tenths of a millimeter or even by a few millimeters, while the cutter 3 is set in the cutting direction and after the scraper has been fully adjusted can be left to the game of forces of the counterweight 12 set for the specific application. The knife 3 is applied to the entire length of the grinding roller 1 with the desired force.

Eine vorteilhafte Ausführungsform eines erfindungsgemäßen Messerabstreifers kann auch darin bestehen, daß man die über den Messerbalken überstehende Messerfläche nur relativ kurz, z. B. nur 1-2 Zentimeter lang, im Vergleich zu ihrer Tiefe in die Aufnahme des Messerbalkens selbst ausführt und gleichzeitig durch die Verspannelemente im wesentlichen den Messerbalken (und dadurch auch die in ihm enthaltene Messerfläche) verbiegt. Hierdurch wird bei dünnen Messern der aus dem Messerbalken überstehende Messerbereich relativ starr und es besteht keinerlei Gefahr des Auftretens unerwünschten Messerflatterns, während die gewünschte Messerverbiegung hauptsächlich innerhalb des Messerbalkens erfolgt. Der überstehende Bereich des Messers wird dann seinerseits nur noch ganz wenig durch seinen Andruck an die Walze elastisch verbogen. Durch eine solche Ausführungsform kann auch bei besonders dünnen Messern der erfindungsgemäß angestrebte Erfolg ohne Beeinträchtigung gut erreicht werden.An advantageous embodiment of a knife scraper according to the invention can also consist in that the knife surface protruding beyond the knife bar is only relatively short, e.g. B. only 1-2 centimeters long, compared to their depth in the holder of the cutter bar itself and at the same time by the clamping elements essentially the cutter bar (and thereby also the knife surface contained in it) bends. As a result, in the case of thin knives, the knife region protruding from the knife bar becomes relatively rigid and there is no risk of undesired knife flutter occurring, while the desired knife bending takes place mainly within the knife bar. The protruding area of the knife is then only slightly bent by its pressure on the roller. With such an embodiment, even with particularly thin knives, the success desired according to the invention can be achieved without impairment.

Claims (5)

1. Knife scraper for drums (1, 1'), particularly for the drums of a cylinder mill, with a pivotable knife beam (5) receiving the knife (3) and having a plurality of mechanical tension element (11 to 15) connected to the knife beam (5) and distributed over its length, whereby by means of said tension elements and accompanied by slight elastic bending, the knife surface (F) extending out of the knife beam (5) presses the cutting edge (4) of knife (3) against drum (1, 1'), characterized in that the tension elements (11 to 15) include a continuous counterweight (12) which, by means of at least three tension bolts (11), arranged approximately at right angles to the knife surface (F) is connected to the knife beam (5).
2. Knife scraper according to claim 1, characterized in that adjustment bolts (9) are associated with the knife (3) and support the latter in the direction of the knife surface (F) to cutting edge (4).
3. Knife scraper according to claim 2, characterized in that the knife (3) is loosely inserted in the receiving slot (6) of knife beam (5) and is supported in the direction of the slot width, whilst interposing a chuck (7).
4. Knife scraper according to claims 2 or 3, characterized in that the counterweight (12) is displaceable on tension bolts (11) relative to the knife beam (5).
5. Knife scraper according to one of the claims 1 to 4, characterized in that the knife surface (F) extending out of the knife beam (5) only projects to a limited extent and the bending of knife surface (F) substantially takes place within the knife beam (5) through a corresponding bending thereof by the tension elements (11 to 15).
EP81103852A 1980-05-20 1981-05-19 Scraper blade for rollers, in particular for rollers of a roller mill used in milling Expired EP0040432B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH3913/80 1980-05-10
CH391380 1980-05-20
DE3023824 1980-06-25
DE19803023824 DE3023824C2 (en) 1980-05-20 1980-06-25 Knife scrapers for rollers, in particular for the rollers of a milling roller mill

Publications (2)

Publication Number Publication Date
EP0040432A1 EP0040432A1 (en) 1981-11-25
EP0040432B1 true EP0040432B1 (en) 1984-03-21

Family

ID=25694153

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81103852A Expired EP0040432B1 (en) 1980-05-20 1981-05-19 Scraper blade for rollers, in particular for rollers of a roller mill used in milling

Country Status (4)

Country Link
US (1) US4434522A (en)
EP (1) EP0040432B1 (en)
JP (1) JPS5939187B2 (en)
WO (1) WO1981003289A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US20230126189A1 (en) * 2021-10-22 2023-04-27 Metso Outotec USA Inc. Roller crusher and method for operating thereof

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US4760598A (en) * 1981-07-23 1988-07-26 Racal Data Communications Inc. Coded data transmission system
DE3610970A1 (en) * 1986-04-02 1987-10-08 Zweegers & Zonen P J ROUND BALL PRESS FOR AGRICULTURAL CROPS
DE3839169A1 (en) * 1988-11-19 1990-05-23 Bayer Ag SCRAPER FOR ROTATING FILTER
SE469034B (en) * 1991-09-02 1993-05-03 Valmet Karlstad Ab DEVICE FOR ADJUSTING THE CRAFTING CONDITIONS
DE19913513A1 (en) * 1999-03-25 2000-09-28 Buehler Ag Blade stripper for rollers has blade beam pivotably mounted in frame of mill by journals on both sides and connected to engagement and disengagement cylinder via lever and clamp system
SE0100505L (en) * 2001-02-16 2002-07-23 Btg Eclepens Sa Self-adjusting blades
CN102614957B (en) * 2012-03-29 2013-12-18 太原重工股份有限公司 Axial positioning device of crushing roller
MX2016011552A (en) * 2014-03-07 2017-04-13 Procter & Gamble Manufacturing apparatus.
ES2823028T3 (en) * 2018-05-25 2021-05-05 Buehler Ag Roller mill with a scraper
US11938488B2 (en) 2021-12-09 2024-03-26 Metso Outotec USA Inc. Roller crusher and method for operation thereof

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GB204959A (en) * 1922-11-21 1923-10-11 Joseph Baker Sons & Perkins Lt Improvements in or relating to scrapers for use with moving or rotating surfaces such as drums, rollers and the like
GB440918A (en) * 1934-12-29 1936-01-08 Thomas Robinson & Son Ltd Improvements relating to roller mills for the milling of cereals and other materials
DE1220703B (en) * 1963-08-28 1966-07-07 Ind G M B H Stripping device for rollers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230126189A1 (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

Also Published As

Publication number Publication date
WO1981003289A1 (en) 1981-11-26
EP0040432A1 (en) 1981-11-25
JPS57500501A (en) 1982-03-25
JPS5939187B2 (en) 1984-09-21
US4434522A (en) 1984-03-06

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