EP0699479B1 - Wear resistant roller for use in high pressure roller mills for pressure milling of granular material - Google Patents

Wear resistant roller for use in high pressure roller mills for pressure milling of granular material Download PDF

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Publication number
EP0699479B1
EP0699479B1 EP95113514A EP95113514A EP0699479B1 EP 0699479 B1 EP0699479 B1 EP 0699479B1 EP 95113514 A EP95113514 A EP 95113514A EP 95113514 A EP95113514 A EP 95113514A EP 0699479 B1 EP0699479 B1 EP 0699479B1
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EP
European Patent Office
Prior art keywords
roller
knob component
radial outer
radial
component
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Expired - Lifetime
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EP95113514A
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German (de)
French (fr)
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EP0699479A1 (en
Inventor
Jakob Ansén
Frank Fischer-Helwig
Ludger Alsmann
Michael Dr. Wollner
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Deutz AG
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Deutz AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • B02C4/305—Wear resistant rollers

Definitions

  • the invention relates to a wear-resistant roller for use in High-pressure roller presses for crushing granular material, with one Large number of welded on the roller surface at a distance from each other and outwardly protruding stud bolts between them Form pockets to hold compressed fine-grained material.
  • brittle ground material is placed in the roller gap, through the two rotatably mounted counter-rotating rollers are separated from each other, drawn in and there a pressure comminution subject.
  • the so-called material bed comminution in the roll gap is also known a high-pressure roller press, in which the individual particles of the ground material drawn into the roller gap by friction in a bed, d. H. in a compressed one between the two roller surfaces Mutual filling of material when using extremely high pressure be crushed. It is understood that the roller surfaces of one exposed to extremely high loads and wear are.
  • the welding the stud bolt can be simpler in terms of production technology Be carried out with the help of a so-called stud welding gun, which lifts the bolt from the workpiece via a lifting magnet, whereby a Arc arises, which melts the bolt end and the base material, after which the bolt is pressed into the molten pool.
  • the stud bolts without welding filler by melting the butt surfaces and pressing connected.
  • the welding of such prefabricated stud bolts is only possible with a weldable bolt material. Therefore, the service life of such stud bolts is used in the extraordinary highly stressed roller surfaces of material bed crushing roller presses limited. To increase the bolt strength is also have been proposed (DE-A-41 32 474 Fig.
  • the nub bolts into matching blind holes in the roller body to press in, weld in, solder in, screw in, shrink in or firmly anchored in the roller body with another connection technology It can also be difficult to use the stud bolts in the event of wear from their blind holes and removed by new bolts replace.
  • the invention is based, for high-pressure roller presses the task Pressure crushing of granular material wear-resistant rollers with for the autogenous Wear protection of suitable surface armor with stud bolts to create a high even when exposed to high pressure loads Have service life.
  • Characteristic of the rolls according to the invention for use in High pressure roller presses for crushing granular good is that on the roller surface two-piece stud bolts are welded, whereby the stud bolts each from a radially inner with the roller surface well weldable bolt part and from the inner bolt part protective covering radially outer harder bolt part assembled are, which the latter consists of a hard material and integrally with the radially inner bolt part is connected.
  • the radially outer bolt part can with advantage of hard metal and / or ceramic material and / or Hard welding materials exist, and it has a hardness of more than 52 HRC (Hardness test according to Rockwell C), especially greater than 58 HRC. That very hard material of the radially outer bolt part increases at the grid-armored material bed crushing roller press roller according to the invention their service life.
  • the radially outer stud part can be friction-welded to the radially inner stud part or arc welding bonded be.
  • the radially outer bolt part can also be made by powder metallurgy and integrally sintered onto the radially inner bolt part.
  • the radially outer bolt part and the radially inner bolt part is a prefabricated unit that is then weld well to the roller surface using the radially inner bolt part leaves. Manufacturing steps such as drilling, pressing in stud bolts in holes etc. are in the surface armor according to the invention avoided.
  • 1 shows a prefabricated cylindrical two-piece studded pin, before this for the surface armoring of the material bed crushing high-pressure roller press roller 2 is used.
  • 2 there is the press roll from a roll base (10), with which the outer Circumferential area forming roller jacket (11) releasably connected (tensioned) is on the surface (12) of a variety of spaced 1 arranged two-part bolt of FIG. 1 is welded.
  • the metallic roller shell (11) can be made of a self-contained Bandage ring consist or of individual with the roller base body (10) releasably braced segments.
  • the two-piece studs can also directly on a roller body (without roller shell) be welded on.
  • the prefabricated stud bolts each consist of one radially inner (lower) weldable to the roller surface (12) Bolt part (13) and from a radially inner bolt part (13) protecting covering radially outer harder bolt part (14), the latter from Hard materials exist and are integral with the radially inner pin part (13) connected is.
  • the radially outer bolt part (14) can be made of hard metal and / or Ceramic material exist or z. B. also made by powder metallurgy and sintered onto the radially inner bolt part (13).
  • connection technique For cohesive Connection of the radially outer bolt part (14) with the radial inner bolt part (13) can be used as a connection technique, the friction pressure welding with rotation of at least one of the stud bodies, the arc welding, can also be used in plasma arcs etc.
  • the Partition surface (15) between the lower bolt part (13) and the upper bolt part (14) does not have to be parallel to the radially outer surface of the bolt lie, but it can e.g. B. similar to the lower surface (16) of the lower Bolt part (13) be conical.
  • the two-part Studs of Fig. 1 are advantageously in the stud welding process welded onto the roller surface (12).
  • the lifting magnet in the welding gun then lifts the two-part Studs from the roller surface (12), by means of a Drawn arc creates an arc that is the lower end of the radially inner one (lower) bolt part (13) and the roller surface (12) locally melts.
  • the lifting mechanism of the stud welding gun is automatic switched off and the two-part pin by means of spring pressure the liquid weld pool is pressed, creating a homogeneous solid connection between the roller surface (12) and the stud bolt arises, which the latter due to the protective radially outer bolt part (14) larger Hardness has a long service life.
  • the hard material of the radially outer Bolt part (14) has a hardness of more than 52 HRC (Hardness test according to Rockwell C), especially greater than 58 HRC.
  • the height of the radially outwardly projecting from the roller surface (12) Bolt is approximately greater than 5 mm, e.g. B. 8 to 10 mm, with a bolt diameter from Z. B. 15 mm.
  • Adjacent studs are like this close distance from each other by z. B. welded smaller than about 40 mm, that the spaces or pockets formed between the bolts in Area of the roller surface (12) are so narrow that in the material bed shredding operation the press roller these spaces or pockets (17) between the bolts with one and the same and pressed through Fine bed crushing resulted in fine-grained but highly compressed Are well filled in, which during the roller revolutions in these Bags remain, d. H.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)

Description

Die Erfindung betrifft eine verschleißfeste Walze für die Verwendung in Hochdruck-Walzenpressen zur Druckzerkleinerung körnigen Gutes, mit einer Vielzahl von auf die Walzenoberfläche mit Abstand voneinander aufgeschweißten und nach außen vorstehenden Noppenbolzen, die zwischen sich Taschen zur Aufnahme von zusammengepreßtem feinkörnigen Gut bilden.The invention relates to a wear-resistant roller for use in High-pressure roller presses for crushing granular material, with one Large number of welded on the roller surface at a distance from each other and outwardly protruding stud bolts between them Form pockets to hold compressed fine-grained material.

Bei Walzenbrechern und Walzenmühlen wird sprödes Mahlgut in den Walzenspalt, durch den die beiden drehbar gelagerten gegenläufig rotierbaren Walzen voneinander getrennt sind, eingezogen und dort einer Druckzerkleinerung unterworfen. Bekannt ist auch die sogenannte Gutbettzerkleinerung im Walzenspalt einer Hochdruck-Walzenpresse, bei der die einzelnen Partikel des durch Reibung in den Walzenspalt eingezogenen Mahlgutes in einem Gutbett, d. h. in einer zwischen den beiden Walzenoberflächen zusammengedrückten Materialschüttung bei Anwendung eines extrem hohen Druckes gegenseitig zerquetscht werden. Es versteht sich, daß dabei die Walzenoberflächen einer außerordentlich hohen Beanspruchung und einem hohen Verschleiß ausgesetzt sind.In the case of roller crushers and roller mills, brittle ground material is placed in the roller gap, through the two rotatably mounted counter-rotating rollers are separated from each other, drawn in and there a pressure comminution subject. The so-called material bed comminution in the roll gap is also known a high-pressure roller press, in which the individual particles of the ground material drawn into the roller gap by friction in a bed, d. H. in a compressed one between the two roller surfaces Mutual filling of material when using extremely high pressure be crushed. It is understood that the roller surfaces of one exposed to extremely high loads and wear are.

Es ist daher bekannt, die Oberflächen von Gutbettzerlieineriings-Walzenpressen dadurch verschleißfest zu machen, indem auf die Walzenoberflächen eine Vielzahl von Profilen wie vorgefertigte stiftförmige Noppenbolzen aufgeschweißt wird, die mit einer so großen Höhe nach außen von der Walzenoberfläche vorstehen und mit einem so engen Abstand voneinander angeordnet sind, daß im Betrieb der Walzenpresse die Zwischenräume bzw. Taschen zwischen den Noppenbolzen mit dem zusammengepreßten feinkörnigen Gutmaterial ausgefüllt bleiben, welches einen autogenen Verschleißschutz für die Walzenoberflächen bildet (EP-A-0 443 195, Fig. 4 und 5). Das Aufschweißen der Noppenbolzen kann dabei in fertigungstechnisch einfacher Weise mit Hilfe einer sogenannten Bolzenschweißpistole durchgeführt werden, die über einen Hubmagnet den Bolzen vom Werkstück abhebt, wobei ein Lichtbogen entsteht, der das Bolzenende und den Grundwerkstoff aufschmilzt, wonach der Bolzen in das flüssige Schmelzbad gedrückt wird. Die Noppenbolzen werden also ohne Schweißzusatz durch Anschmelzen der Stoßflächen und Anpressen verbunden. Das Aufschweißen solcher vorgefertigter Noppenbolzen ist allerdings nur bei einem aufschweißbaren Bolzenmaterial möglich. Daher ist die Standzeit solcher Noppenbolzen angewendet bei den außerordentlich hoch beanspruchten Walzenoberflächen von Gutbettzerkleinerungs-Walzenpressen begrenzt. Zur Erhöhung der Bolzenfestigkeit ist auch schon vorgeschlagen worden (DE-A-41 32 474 Fig. 6), die Noppenbolzen in Sackloch-Bohrungen des Walzenkörpers von Gutbettzerkleinerungs-Walzenpressen einzulagern, um sie igelförmig aus den Bohrungen des Walzenkörpers herausragen zu lassen. Es ist aber fertigungstechnisch verhältnismäßig aufwendig, die Noppenbolzen in passende Sackloch-Bohrungen des Walzenkörpers einzupressen, einzuschweißen, einzulöten, einzuschrauben, einzuschrumpfen oder mit einer sonstigen Verbindungstechnik fest im Walzenkörper zu verankern. Außerdem kann es Mühe machen, im Verschleißfall die Noppenbolzen aus ihren Sackloch-Bohrungen wieder zu entfernen und durch neue Bolzen zu ersetzen.It is known, therefore, the surfaces of material bed rolling presses thereby making it wear-resistant by applying a Variety of profiles such as prefabricated stud-shaped stud bolts welded on being that with such a great height outward from the roll surface protrude and arranged so close to each other are that the gaps or pockets in the operation of the roller press between the stud bolts with the compressed fine-grained Stay well filled in, which is an autogenous wear protection for forms the roll surfaces (EP-A-0 443 195, Figs. 4 and 5). The welding the stud bolt can be simpler in terms of production technology Be carried out with the help of a so-called stud welding gun, which lifts the bolt from the workpiece via a lifting magnet, whereby a Arc arises, which melts the bolt end and the base material, after which the bolt is pressed into the molten pool. The stud bolts without welding filler by melting the butt surfaces and pressing connected. The welding of such prefabricated stud bolts is only possible with a weldable bolt material. Therefore, the service life of such stud bolts is used in the extraordinary highly stressed roller surfaces of material bed crushing roller presses limited. To increase the bolt strength is also have been proposed (DE-A-41 32 474 Fig. 6), the stud bolts in blind holes of the roller body of material bed crushing roller presses to store them in a hedgehog shape from the holes in the roller body to stick out. However, it is relatively complex in terms of production technology, the nub bolts into matching blind holes in the roller body to press in, weld in, solder in, screw in, shrink in or firmly anchored in the roller body with another connection technology. It can also be difficult to use the stud bolts in the event of wear from their blind holes and removed by new bolts replace.

Der Erfindung liegt die Aufgabe zugrunde, für Hochdruck-Walzenpressen zur Druckzerkleinerung körnigen Gutes verschleißfeste Walzen mit für den autogenen Verschleißschutz geeigneter Oberflächenpanzerung mit Noppenbolzen zu schaffen, die auch bei Einwirkung hoher Preßdruckbelastungen ein hohes Standzeitvermögen aufweisen.The invention is based, for high-pressure roller presses the task Pressure crushing of granular material wear-resistant rollers with for the autogenous Wear protection of suitable surface armor with stud bolts to create a high even when exposed to high pressure loads Have service life.

Diese Aufgabe wird gemäß der Erfindung mit den Maßnahmen des Kennzeichnungsteils des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen sind in den Unteransprüchen angegeben. This object is achieved according to the invention with the measures of the labeling part of claim 1 solved. Advantageous configurations are shown in specified in the subclaims.

Charakteristisch für die erfindungsgemäßen Walzen für die Verwendung in Hochdruck-Walzenpressen zur Druckzerkleinerung körnigen Gutes ist, daß auf die Walzenoberfläche zweiteilige Noppenbolzen aufgeschweißt sind, wobei die Noppenbolzen jeweils aus einem radial inneren mit der Walzenoberfläche gut verschweißbaren Bolzenteil und aus einem den inneren Bolzenteil schützend abdeckenden radial äußeren härteren Bolzenteil zusammengesetzt sind, welch letzterer aus einem Hartstoff besteht und stoffschlüssig mit dem radial inneren Bolzenteil verbunden ist. Der radial äußere Bolzenteil kann dabei mit Vorteil aus Hartmetall und/oder aus Keramikmaterial und/oder aus Hartschweißstoffen bestehen, und er weist eine Härte von mehr als 52 HRC (Härteprüfung nach Rockwell C), insbesondere größer 58 HRC auf. Das sehr harte Material des radial äußeren Bolzenteils erhöht bei der erfindungsgemäßen rastergepanzerten Gutbettzerkleinerungs-Rollenpressenwalze deren Standzeitvermögen.Characteristic of the rolls according to the invention for use in High pressure roller presses for crushing granular good is that on the roller surface two-piece stud bolts are welded, whereby the stud bolts each from a radially inner with the roller surface well weldable bolt part and from the inner bolt part protective covering radially outer harder bolt part assembled are, which the latter consists of a hard material and integrally with the radially inner bolt part is connected. The radially outer bolt part can with advantage of hard metal and / or ceramic material and / or Hard welding materials exist, and it has a hardness of more than 52 HRC (Hardness test according to Rockwell C), especially greater than 58 HRC. That very hard material of the radially outer bolt part increases at the grid-armored material bed crushing roller press roller according to the invention their service life.

Der radial äußere Bolzenteil kann mit dem radial inneren Bolzenteil durch Reibungspreßschweißung oder Lichtbogenschweißung stoffschlüssig verbunden sein. Der radial äußere Bolzenteil kann aber auch pulvermetallurgisch hergestellt und auf den radial inneren Bolzenteil stoffschlüssig aufgesintert sein. In jedem Fall ist es fertigungstechnisch vorteilhaft, wenn der radial äußere Bolzenteil und der radial innere Bolzenteil eine vorgefertigte Einheit sind, die sich dann über den radial inneren Bolzenteil gut mit der Walzenoberfläche verschweißen läßt. Fertigungsschritte wie Bohren, Einpressen von Noppenbolzen in Bohrungen etc. sind bei der erfindungsgemäßen Oberflächenpanzerung vermieden.The radially outer stud part can be friction-welded to the radially inner stud part or arc welding bonded be. The radially outer bolt part can also be made by powder metallurgy and integrally sintered onto the radially inner bolt part. In In any case, it is technically advantageous if the radially outer bolt part and the radially inner bolt part is a prefabricated unit that is then weld well to the roller surface using the radially inner bolt part leaves. Manufacturing steps such as drilling, pressing in stud bolts in holes etc. are in the surface armor according to the invention avoided.

Die Erfindung und deren weitere Merkmale und Vorteile werden anhand der in den Figuren schematisch dargestellten Ausführungsbeispiele näher erläutert.The invention and its further features and advantages are based on the in the figures schematically illustrated embodiments.

Es zeigt:

Fig. 1:
einen vorgefertigten erfindungsgemäßen zweiteiligen Noppenbolzen für die Oberflächenpanzerung von Druckzerkleinerungs-Pressenwalzen, und
Fig. 2:
ausschnittsweise einen Vertikalschnitt quer zur Drehachse einer erfindungsgemäßen rastergepanzerten Walzenpressenwalze mit Einsatz der Noppenbolzen der Fig. 1.
It shows:
Fig. 1:
a prefabricated two-piece studded bolt according to the invention for the surface armoring of pressure reduction press rolls, and
Fig. 2:
Detail of a vertical section transverse to the axis of rotation of a grid-armored roll press roll according to the invention with the use of the stud bolts of FIG. 1.

Fig. 1 zeigt einen vorgefertigten zylindrischen zweiteiligen Noppenbolzen, bevor dieser zur Oberflächenpanzerung der Gutbettzerkleinerungs-Hochdruck-Walzenpressenwalze der Fig. 2 eingesetzt wird. Nach Fig. 2 besteht die Pressenwalze aus einem Walzengrundkörper (10), mit dem ein den äußeren Umfangsbereich bildender Walzenmantel (11) lösbar verbunden (verspannt) ist, auf dessen Oberfläche (12) eine Vielzahl von mit Abstand voneinander angeordneter zweiteiliger Bolzen der Fig. 1 aufgeschweißt ist. Der metallische Walzenmantel (11) kann aus einem in sich geschlossenen Bandagenring bestehen oder aus einzelnen mit dem Walzengrundkörper (10) lösbar verspannten Segmenten zusammengesetzt sein. Die zweiteiligen Noppenbolzen können auch unmittelbar auf einen Walzenkörper (ohne Walzenmantel) aufgeschweißt sein.1 shows a prefabricated cylindrical two-piece studded pin, before this for the surface armoring of the material bed crushing high-pressure roller press roller 2 is used. 2 there is the press roll from a roll base (10), with which the outer Circumferential area forming roller jacket (11) releasably connected (tensioned) is on the surface (12) of a variety of spaced 1 arranged two-part bolt of FIG. 1 is welded. The metallic roller shell (11) can be made of a self-contained Bandage ring consist or of individual with the roller base body (10) releasably braced segments. The two-piece studs can also directly on a roller body (without roller shell) be welded on.

Nach Fig. 1 bestehen die vorgefertigten Noppenbolzen jeweils aus einem radial inneren (unteren) mit der Walzenoberfläche (12) gut verschweißbaren Bolzenteil (13) und aus einem den radial inneren Bolzenteil (13) schützend abdeckenden radial äußeren härteren Bolzenteil (14), welch letzterer aus Hartstoffen besteht und stoffschlüssig mit dem radial inneren Bolzenteil (13) verbunden ist. Der radial äußere Bolzenteil (14) kann aus Hartmetall und/oder Keramikmaterial bestehen oder z. B. auch pulvermetallurgisch hergestellt und auf den radial inneren Bolzenteil (13) aufgesintert sein. Zur stoffschlüssigen Verbindung des radial äußeren Bolzenteils (14) mit dem radial inneren Bolzenteil (13) kann als Verbindungstechnik die Reibungspreßschweißung mit Rotation wenigstens eines der Bolzenkörper, die Lichtbogenschweißung, auch im Plasmalichtbogen etc. eingesetzt werden. Die Trennfläche (15) zwischen unterem Bolzenteil (13) und oberem Bolzenteil (14) muß nicht planparallel zur radial außen liegenden Oberfläche des Bolzens liegen, sondern sie kann z. B. ähnlich wie die Unterfläche (16) des unteren Bolzenteils (13) kegelmantelförmig ausgebildet sein. Die zweiteiligen Noppenbolzen der Fig. 1 werden mit Vorteil im Bolzenschweißverfahren auf die Walzenoberfläche (12) aufgeschweißt. Dazu wird der zweiteilige Noppenbolzen in die Halterung einer Bolzenschweißpistole eingesetzt und die Schweißpistole wird dann auf die Walzenoberfläche (12) aufgesetzt. Ein in der Schweißpistole vorhandener Hubmagnet hebt dann den zweiteiligen Noppenbolzen von der Walzenoberfläche (12) ab, wobei vermittels einer Hubzündung ein Lichtbogen entsteht, der das untere Ende des radial inneren (unteren) Bolzenteils (13) sowie die Walzenoberfläche (12) lokal aufschmilzt. Danach wird der Hubmechanismus der Bolzenschweißpistole automatisch abgeschaltet und der zweiteilige Bolzen mittels Federdruckes in das flüssige Schmelzbad gepreßt, wodurch eine homogene feste Verbindung zwischen der Walzenoberfläche (12) und dem Noppenbolzen entsteht, welch letzterer infolge des schützenden radial äußeren Bolzenteils (14) großer Härte ein hohes Standzeitvermögen aufweist. Der Hartstoff des radial äußeren Bolzenteils (14) weist dabei eine Härte von mehr als 52 HRC (Härteprüfung nach Rockwell C), insbesondere größer 58 HRC auf.1, the prefabricated stud bolts each consist of one radially inner (lower) weldable to the roller surface (12) Bolt part (13) and from a radially inner bolt part (13) protecting covering radially outer harder bolt part (14), the latter from Hard materials exist and are integral with the radially inner pin part (13) connected is. The radially outer bolt part (14) can be made of hard metal and / or Ceramic material exist or z. B. also made by powder metallurgy and sintered onto the radially inner bolt part (13). For cohesive Connection of the radially outer bolt part (14) with the radial inner bolt part (13) can be used as a connection technique, the friction pressure welding with rotation of at least one of the stud bodies, the arc welding, can also be used in plasma arcs etc. The Partition surface (15) between the lower bolt part (13) and the upper bolt part (14) does not have to be parallel to the radially outer surface of the bolt lie, but it can e.g. B. similar to the lower surface (16) of the lower Bolt part (13) be conical. The two-part Studs of Fig. 1 are advantageously in the stud welding process welded onto the roller surface (12). This will be the two-part Stud studs inserted into the bracket of a stud welding gun and the welding gun is then placed on the roller surface (12). A The lifting magnet in the welding gun then lifts the two-part Studs from the roller surface (12), by means of a Drawn arc creates an arc that is the lower end of the radially inner one (lower) bolt part (13) and the roller surface (12) locally melts. After that, the lifting mechanism of the stud welding gun is automatic switched off and the two-part pin by means of spring pressure the liquid weld pool is pressed, creating a homogeneous solid connection between the roller surface (12) and the stud bolt arises, which the latter due to the protective radially outer bolt part (14) larger Hardness has a long service life. The hard material of the radially outer Bolt part (14) has a hardness of more than 52 HRC (Hardness test according to Rockwell C), especially greater than 58 HRC.

Die Höhe der von der Walzenoberfläche (12) radial nach außen vorstehenden Bolzen beträgt ca. größer 5 mm, z. B. 8 bis 10 mm, bei einem Bolzendurchmesser von z. B. 15 mm. Benachbarte Noppenbolzen sind in einem so engen Abstand voneinander von z. B. kleiner etwa 40 mm aufgeschweißt, daß die zwischen den Bolzen gebildeten Zwischenräume bzw. Taschen im Bereich der Walzenoberfläche (12) so eng sind, daß im Gutbettzerkleinerungs-Betrieb der Pressenwalze diese Zwischenräume bzw. Taschen (17) zwischen den Bolzen mit ein und demselben zusammengepreßten und durch Gutbettzerkleinerung hervorgegangenen feinkörnigen, aber hochverdichteten Gut ausgefüllt sind, welches während der Walzenumdrehungen in diesen Taschen liegenbleibt, d. h. das in die Zwischenräume bzw. Taschen (17) zwischen den Noppenbolzen von außen hineingepreßte und dort mit Sicherheit verbleibende Gutmaterial bildet einen idealen autogenen Verschleißschutz. Im übrigen macht es keine Mühe, einzelne zweiteilige Noppenbolzen, die von Haus aus ein hohes Standzeitvermögen garantieren, im Falle ihrer Beschädigung oder ihres Verschleißes mittels Einsatzes einer Bolzenschweißpistole durch neue vorgefertigte zweiteilige Noppenbolzen wieder zu ersetzen.The height of the radially outwardly projecting from the roller surface (12) Bolt is approximately greater than 5 mm, e.g. B. 8 to 10 mm, with a bolt diameter from Z. B. 15 mm. Adjacent studs are like this close distance from each other by z. B. welded smaller than about 40 mm, that the spaces or pockets formed between the bolts in Area of the roller surface (12) are so narrow that in the material bed shredding operation the press roller these spaces or pockets (17) between the bolts with one and the same and pressed through Fine bed crushing resulted in fine-grained but highly compressed Are well filled in, which during the roller revolutions in these Bags remain, d. H. into the spaces or pockets (17) pressed in from the outside between the stud bolts and there with certainty remaining good material forms an ideal autogenous wear protection. Moreover, it is no problem to use individual two-piece studs, which guarantee a long service life, in the event their damage or wear by using a stud welding gun with new prefabricated two-piece studs replace.

Claims (8)

  1. A roller for use in high pressure rolling mills for the pressure pulverisation of granular material, with a multiplicity of knob bolts on the roller surface (12) welded on at a distance from each other and extending outwards, which form pockets (17) between each other for the acceptance of compressed fine grain material, characterised in that the knob bolts are each assembled from a radial inner knob component (13), readily weldable to the roller surface (12) and, from a hardened radial outer knob component (14), protecting the radial inner knob component, which latter comprises hard material and is joined to the inner knob component (13)
  2. A roller according to Claim 1, characterised in that the radial outer knob component (14) comprises hard metal and/or ceramic material and/or hard welding materials.
  3. A roller according to Claim 1 or Claim 2, characterised in that the hard material of the radial outer knob component (14) has a hardness greater than 52 HRC (hardness test according to Rockwell C), especially greater than 58 HRC.
  4. A roller according to one of the Claims 1 to 3, characterised in that the radial outer knob component (14) is joined to the radial inner knob component (13) by friction welding or arc welding or plating welding as for instance explosion plating, in a material bonding manner.
  5. A roller according to one of the Claims 1 to 3, characterised in that the radial outer knob component (14) is produced by powder metallurgical means and sintered onto the radial inner knob component (13).
  6. A roller according to one of the Claims 1 to 3, characterised in that the radial outer knob component (14) and the radial inner knob component (13) are produced individually or together by powder metallurgical means, whereby in each case the two parts are sintered together.
  7. A roller according to one of the Claims 1 to 6, characterised in that the radial outer knob component (14) and the radial inner knob component (13) are a pre-manufactured unit.
  8. A roller according to one of the Claims 1 to 7, characterised in that the roller casing (11), onto whose surface (12) the two-part knob bolts (13, 14) are welded, comprises an essentially closed bandage ring or individual stressed elements which can be detached from the basic body of the roller.
EP95113514A 1994-09-05 1995-08-29 Wear resistant roller for use in high pressure roller mills for pressure milling of granular material Expired - Lifetime EP0699479B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4431563A DE4431563A1 (en) 1994-09-05 1994-09-05 Wear-resistant surface armor for the rollers of high-pressure roller presses for pressure reduction of granular goods (documents for P 44 44 337.4 given)
DE4431563 1994-09-05

Publications (2)

Publication Number Publication Date
EP0699479A1 EP0699479A1 (en) 1996-03-06
EP0699479B1 true EP0699479B1 (en) 1999-11-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95113514A Expired - Lifetime EP0699479B1 (en) 1994-09-05 1995-08-29 Wear resistant roller for use in high pressure roller mills for pressure milling of granular material

Country Status (4)

Country Link
US (1) US5704561A (en)
EP (1) EP0699479B1 (en)
DE (2) DE4431563A1 (en)
DK (1) DK0699479T3 (en)

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Also Published As

Publication number Publication date
DE59507238D1 (en) 1999-12-23
DE4431563A1 (en) 1996-03-07
EP0699479A1 (en) 1996-03-06
DK0699479T3 (en) 2000-05-08
US5704561A (en) 1998-01-06

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