EP0388825B1 - Wear element for an impact mill rotor - Google Patents
Wear element for an impact mill rotor Download PDFInfo
- Publication number
- EP0388825B1 EP0388825B1 EP90105084A EP90105084A EP0388825B1 EP 0388825 B1 EP0388825 B1 EP 0388825B1 EP 90105084 A EP90105084 A EP 90105084A EP 90105084 A EP90105084 A EP 90105084A EP 0388825 B1 EP0388825 B1 EP 0388825B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- face
- wearing
- carrier body
- hard metal
- member according
- 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.)
- Expired - Lifetime
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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
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
- B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
- B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
- B02C13/1835—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc
- B02C13/1842—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc with dead bed protected beater or impeller elements
Definitions
- the invention relates to an interchangeable wear part for the rotor of an impact mill, which is arranged in an approximately ring-shaped housing and is provided with an axial inlet opening and with ejection openings formed on the circumference, the interchangeable wear part being approximately L-shaped, the longer leg of which is formed by a essentially plate-shaped carrier body and its shorter leg is formed by a hard metal strip as a chute reinforcement, which preferably consists of an alloy with a tungsten carbide content of over 91%, the rest essentially cobalt, and forms a wear surface that recoils in the direction of ejection.
- Such a replaceable wear part can be found, for example, in DE-U-8 630 185.
- the wearing part has a hard metal strip, which corresponds approximately to a quarter or third circle, the wearing surface having a satisfactory service life and a favorable, fairly uniform wear when comminuting crushed material in the usual composition.
- crushed material with a high proportion of fines leads to less favorable wear, so that the innovation has set itself the task of creating a wear part whose hard metal strip also leads to good results in this case, that is to say a satisfactorily long service life.
- the hard metal strip is designed as a pentagonal prism, a first and a second section of the wear surface abutting one another in a tear-off edge at an internal angle of approximately 125 °.
- a major cause is likely to be the level design of the two sections of the wear surface that are significantly subject to wear, the aspect ratio of which is preferably between 1: 4 and 1: 5.
- the second and a third section of the wear surface lying outside the rotor circumference preferably form an angle of 110 ° with one another, the length of the third section being in particular essentially the same as that of the first section.
- the surface of the hard metal strip adjoining the carrier body preferably extends essentially perpendicular to the first section of the wear surface and delimits a material receiving pocket formed in the rotor.
- the angle between the surface adjoining the carrier body and the mounting surface or soldering surface to the carrier body is 115 °, the counter surface or supporting surface of the carrier body being in particular beveled at 40 ° to the carrier body.
- the rotor 2 of an impact mill is arranged in an annular housing, in which impact surfaces are formed due to the material that has set up.
- the rotor 2 has a bottom plate 9, a cover plate, not shown, and wings 11 arranged between them, a central opening being provided in the cover plate through which the material to be comminuted enters the rotor 2.
- Below the opening in the cover plate there is a conical or truncated cone-shaped impact body 7 which distributes the material to be shredded, which accelerates in the rotor 2 with the help of the vanes 11 and is finally thrown out through outlet openings 16 onto the impact surfaces of the housing and is thereby broken.
- a circumferential rotor speed of 60-72 m / s is preferably selected.
- the rotor 2 is provided with three vanes 11, which extend substantially in the circumferential direction, leaving a central region the size of the impact body 7.
- Each wing 11 consists of a three-sided part with the circumference correspondingly curved outside and inside, each inside of two wings 11 defining an ejection channel that narrows towards the outlet opening 16.
- One of the two inner sides is concave, so that a material receiving pocket 17 is formed, in which material accumulates at the beginning of the shredding process, the surface of which also forms an impact surface, thereby protecting the wing 11 from damage.
- a contact plane B of the two edge edges of the material receiving pocket 17, in which a material surface following a curved line 27 is formed due to the rotor rotation, preferably also represents a tangential plane to the baffle plate 7.
- the protruding over the rotor circumference is arranged, which consists of a support body 12 which can be fastened to the wing 11 and made of steel and a low-wear hard metal strip 13, especially of the B 10 T type with a tungsten carbide content of 94%, a Vickers hardness of 1450 HV and a tungsten carbide grain size between 0.002 and 0.004 mm.
- the circumferential parts of the wings are protected by the wear parts projecting beyond the rotor circumference, so that the armor to be provided there can be given thinly.
- the carrier body 12 which can be fastened to the wing end by means of screws 14, has, for example, the essentially plate-shaped configuration shown.
- the hard metal strip 13 is designed in the form of a pentagonal prism, and has an outer wear surface 21 consisting of three sections 25, 26, 28, an inner surface 20 forming the inner surface of the material-receiving pocket 17 and a mounting surface 22 which is at an angle below 40 ° bevelled support surface of the support body 12 abuts.
- the height of the hard metal strip 13 can also be divided into several sections.
- the hard metal strip 13 is fastened to the end of the carrier body 12, in particular soldered on, in such a way that the first section 25 of the wear surface 21 lies approximately in the abovementioned contact plane B and forms an angle of 125 ° with the second section 26, the two sections 25, 26 meet in the tear-off edge 24.
- the inner surface 20 extends to the first section 25 at an angle of approximately 90 ° and to the mounting surface 22 with which the hard metal strip 13 rests on the carrier body 12 at an angle of 115 °.
- a third section 28 of the wear surface 21 adjoins the second section 26 at an angle of 110 °.
- the mounting surface 22 and the third section 28 of the wear surface 21 enclose an angle of 100 °.
- the respective Lengths of the mounting surface 22 and the inner surface 20 or the first and third sections 25, 28 of the wear surface 21 are substantially the same.
- the inner surface 20 of the hard metal strip 13 and the adjoining side surface 23 of the plate-shaped carrier body 12 are at an angle of approximately 105 ° to one another, so that the wearing part is thus L-shaped overall, the shorter leg through the hard metal strip 13 and the longer leg through the Carrier body 12 is formed.
- the overall arrangement of the wearing part is preferably such that an axial plane A of the rotor 2 includes an angle of approximately 25 ° to 30 ° through the tear-off edge 24 with the first section 25.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Pulverization Processes (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Die Erfindung betrifft einen auswechselbaren Verschleißteil für den Rotor einer Prallmühle, der in einem etwa ringförmigen Gehäuse angeordnet und mit einer axialen Eintrittsöffnung, sowie mit am Umfang gebildeten Auswurföffnungen versehen ist, wobei der auswechselbare Verschleißteil etwa L-förmig ausgebildet ist, dessen längerer Schenkel durch einen im wesentlichen plattenförmigen Trägerkörper und dessen kürzerer Schenkel durch eine Hartmetalleiste als Auswurföffnungsbewehrung gebildet ist, die vorzugsweise aus einer Legierung mit einem Wolframcarbidanteil von über 91 %, Rest im wesentlichen Kobalt, besteht und eine in Auswurfrichtung rückspringende Verschleißfläche bildet.The invention relates to an interchangeable wear part for the rotor of an impact mill, which is arranged in an approximately ring-shaped housing and is provided with an axial inlet opening and with ejection openings formed on the circumference, the interchangeable wear part being approximately L-shaped, the longer leg of which is formed by a essentially plate-shaped carrier body and its shorter leg is formed by a hard metal strip as a chute reinforcement, which preferably consists of an alloy with a tungsten carbide content of over 91%, the rest essentially cobalt, and forms a wear surface that recoils in the direction of ejection.
Ein derartiger auswechselbarer Verschleißteil ist beispielsweise dem DE-U- 8 630 185 zu entnehmen. Der Verschleißteil weist eine Hartmetalleiste auf, die etwa einem Viertel- oder Drittelkreis entspricht, wobei die Verschleißfläche zufriedenstellende Standzeit und einen günstigen, ziemlich gleichmäßig verlaufenden Verschleiß beim Zerkleinern von Brechgut in üblicher Zusammensetzung auf. Brechgut mit hohem Feinanteil führt jedoch zu ungünstigerem Verschleiß, sodaß es sich die Neuerung zur Aufgabe gestellt hat, einen Verschleißteil zu schaffen, dessen Hartmetalleiste auch in diesem Fall zu guten Ergebnissen, das heißt einer zufriedenstellend langen Standzeit führt.Such a replaceable wear part can be found, for example, in DE-U-8 630 185. The wearing part has a hard metal strip, which corresponds approximately to a quarter or third circle, the wearing surface having a satisfactory service life and a favorable, fairly uniform wear when comminuting crushed material in the usual composition. However, crushed material with a high proportion of fines leads to less favorable wear, so that the innovation has set itself the task of creating a wear part whose hard metal strip also leads to good results in this case, that is to say a satisfactorily long service life.
Erfindungsgemäß wird dies dadurch erreicht, daß die Hartmetalleiste als fünfkantiges Prisma ausgebildet ist, wobei ein erster und ein zweiter Abschnitt der Verschleißfläche in einer Abrißkante in einem Innenwinkel von etwa 125° zueinander stoßen.According to the invention, this is achieved in that the hard metal strip is designed as a pentagonal prism, a first and a second section of the wear surface abutting one another in a tear-off edge at an internal angle of approximately 125 °.
Die Ursachen für die standzeitverlängernde Wirkung der erfindungsgemäßen Ausgestaltung sind noch nicht völlig ersichtlich. Eine wesentliche Ursache dürfte in der ebenen Ausbildung der beiden maßgeblich dem Verschleiß unterliegenden Abschnitte der Verschleißfläche liegen, deren Längenverhältnis bevorzugt zwischen 1:4 und 1:5 liegt. Der zweite und ein dritter, außerhalb des Rotorumfanges liegender Abschnitt der Verschleißfläche schließen bevorzugt einen Winkel von 110° miteinander ein, wobei die Länge des dritten Abschnittes insbesondere im wesentlichen gleich der des ersten Abschnittes ist. Die an den Trägerkörper anschließende Fläche der Hartmetalleiste erstreckt sich bevorzugt im wesentlichen senkrecht zum ersten Abschnitt der Verschleißfläche und begrenzt eine im Rotor ausgebildete Materialaufnahmetasche. Weiters beträgt in einer bevorzugten Ausführung der Winkel zwischen der an den Trägerkörper anschließenden Fläche und der Montagefläche bzw. Lötfläche zum Trägerkörper 115°, wobei die Gegenfläche bzw. Stützfläche des Trägerkörpers insbesondere unter 40° zum Trägerkörper abgeschrägt ist.The causes of the service life-prolonging effect of the embodiment according to the invention are not yet fully apparent. A major cause is likely to be the level design of the two sections of the wear surface that are significantly subject to wear, the aspect ratio of which is preferably between 1: 4 and 1: 5. The second and a third section of the wear surface lying outside the rotor circumference preferably form an angle of 110 ° with one another, the length of the third section being in particular essentially the same as that of the first section. The surface of the hard metal strip adjoining the carrier body preferably extends essentially perpendicular to the first section of the wear surface and delimits a material receiving pocket formed in the rotor. Furthermore, in a preferred embodiment, the angle between the surface adjoining the carrier body and the mounting surface or soldering surface to the carrier body is 115 °, the counter surface or supporting surface of the carrier body being in particular beveled at 40 ° to the carrier body.
Nachstehend wird nun die Erfindung an Hand der Figuren der beiliegenden Zeichnungen näher beschrieben, ohne darauf beschränkt zu sein.The invention will now be described in more detail below with reference to the figures in the accompanying drawings, without being limited thereto.
Es zeigen:
- Fig. 1
- einen Horizontalschnitt durch einen Rotor einer Prallmühle, dessen drei Auswurföffnungen mit erfindungsgemäßen Verschleißteilen bestückt sind und
- Fig. 2
- den Bereich einer Auswurföffnung vergrößert im Detail.
- Fig. 1
- a horizontal section through a rotor of an impact mill, the three discharge openings are equipped with wearing parts according to the invention and
- Fig. 2
- enlarged the area of an ejection opening in detail.
Der Rotor 2 einer Prallmühle ist in einem ringförmigen Gehäuse angeordnet, in dem sich durch sich ansetzendes Material Prallflächen ausbilden. Der Rotor 2 weist eine Boden platte 9, eine nicht gezeichnete Deckplatte und zwischen diesen angeordnete Flügel 11 auf, wobei in der Deckplatte eine zentrale Öffnung vorgesehen ist, durch die das zu zerkleinernde Material in den Rotor 2 gelangt. Unterhalb der Öffnung in der Deckplatte befindet sich ein kegel- bzw. kegelstumpfförmiger Prallkörper 7, der das zu zerkleinernde Material verteilt, das im Rotor 2 mit Hilfe der Flügel 11 beschleunigt und schließlich durch Austrittsöffnungen 16 auf die Prallflächen des Gehäuses ausgeschleudert und dabei zerbrochen wird. Vorzugsweise wird eine Rotorumfangsgeschwindigkeit von 60-72 m/s gewählt.The
Der Rotor 2 ist mit drei Flügeln 11 versehen, die sich unter Freilassung eines Mittelbereiches in der Größe des Prallkörpers 7 im wesentlichen in Umfangsrichtung erstrecken. Jeder Flügel 11 besteht aus einem dreiseitigen Teil mit dem Umfang entsprechend gewölbter Außenseite und Innenseiten, wobei je eine Innenseite zweier Flügel 11 einen Auswurfkanal begrenzt, der sich zur Austrittsöffnung 16 hin verengt. Eine der beiden Innenseiten verläuft konkav, sodaß sich dadurch eine Materialaufnahmetasche 17 ausbildet, in der sich zu Beginn des Zerkleinerungsvorganges Material ansammelt, dessen Oberfläche ebenfalls eine Prallfläche bildet, wodurch der Flügel 11 vor Beschädigung geschützt ist. Eine Berührungsebene B der beiden Randkanten der Materialaufnahmetasche 17, in der sich bedingt durch die Rotordrehung eine einer gekrümmten Linie 27 folgende Materialoberfläche ausbildet, stellt vorzugsweise auch eine Tangentialebene zum Prallteller 7 dar. Am Auswurfende jedes Flügels 11, an dem der Oberflächenschutz durch Materialansammlung nicht mehr möglich ist, ist der über den Rotorumfang vorstehende, neuerungsgemäße Verschleißteil angeordnet, der aus einem am Flügel 11 befestigbaren Trägerkörper 12 aus Stahl und einer verschleißarmen Hartmetalleiste 13, vor allem der Sorte B 10 T mit einem Wolframcarbidanteil von 94 %, einer Vickershärte von 1450 HV und einer Wolframcarbidkorngröße zwischen 0,002 und 0,004 mm besteht. Durch die über den Rotorumfang vorstehenden Verschleißteile werden die Umfangspartien der Flügel geschont, sodaß die dort vorzusehende Panzerung dünn angeführt werden kann.The
In Fig. 2 ist das mit dem erfindungsgemäßen Verschleißteil bestückte Ende eines Flügels 11 im Detal dargestellt. Der Trägerkörper 12, der mittels Schrauben 14 am Flügelende befestigbar ist, weist beispielsweise die gezeigte, im wesentlichen plattenförmige Ausbildung auf. Die Hartmetallleiste 13 ist in Form eines fünfkantigen Prismas ausgebildet, und weist eine äußere aus drei Abschnitten 25, 26, 28 bestehende Verschleißfläche 21, eine innere, die Innenfläche der Materialaufnahmetasche 17 bildende Fläche 20 und eine Montagefläche 22 auf, die an einer unter 40° abgeschrägten Stützfläche des Trägerkörpers 12 anliegt. Die Hartmetalleiste 13 kann in der Höhe auch in mehrere Abschnitte unterteilt sein.2 shows the end of a
Die Hartmetalleiste 13 ist am Ende des Trägerkörpers 12 so befestigt, insbesondere angelötet, daß der erste Abschnitt 25 der Verschleißfläche 21 annähernd in der erwähnten Berührungsebene B liegt und mit dem zweiten Abschnitt 26 einen Winkel von 125° einschließt, wobei die beiden Abschnitte 25, 26 in der Abrißkante 24 aufeinander treffen. Die innere Fläche 20 erstreckt sich zum ersten Abschnitt 25 in einem Winkel von annähernd 90° und zur Montagefläche 22, mit der die Hartmetalleiste 13 am Trägerkörper 12 aufliegt, in einem Winkel von 115°.The
An den zweiten Abschnitt 26 schließt im Winkel von 110° ein dritter Abschnitt 28 der Verschleißfläche 21 an. Die Montagefläche 22 und der dritte Abschnitt 28 der Verschleißfläche 21 schließen einen Winkel von 100° ein. Die jeweiligen Längen der Montagefläche 22 und der inneren Fläche 20 bzw. des ersten und des dritten Abschnittes 25, 28 der Verschleißfläche 21 sind im wesentlichen gleich. Die innere Fläche 20 der Hartmetalleiste 13 und die anschließende Seitenfläche 23 des plattenförmigen Trägerkörpers 12 liegen im Winkel von etwa 105° zueinander, sodaß der Verschleißteil insgesamt somit L-förmig ausgebildet ist, wobei der kürzere Schenkel durch die Hartmetalleiste 13 und der längere Schenkel durch den Trägerkörper 12 gebildet wird. Die Gesamtanordnung des Verschleißteiles ist dabei vorzugsweise so, daß eine Axialebene A des Rotors 2 durch die Abrißkante 24 mit dem ersten Abschnitt 25 einen Winkel von etwa 25° bis 30° einschließt.A
Claims (6)
- An interchangeable wearing member (12, 13) for the rotor of an impact crusher, which is disposed in a substantially annular housing and is provided with an axial inlet opening and with ejection openings formed at the periphery, wherein the interchangeable wearing member (12, 13) is of a substantially L-shaped configuration, of which the longer limb is formed by a substantially plate-shaped carrier body (12) and the shorter limb (13) is formed by a hard metal bar as an ejection opening reinforcing sheating which preferably comprises an alloy with a tungsten carbide component of over 91%, with the balance susbstantially cobalt, and forms a wearing face (21) which is offset in the ejection direction, characterised in that the hard metal bar (13) is in the form of a pentagonal prism, wherein a first and a second portion (25, 26) of the wearing face (21) meet at a suspension edge (24) at an interior angle of about 125° relative to each other.
- A wearing member according to claim 1 characterized in that the second portion (26) and a third portion (28) of the wearing face (21) include an interior angle of 110°.
- a wearing member according to claim 2 characterised in that the third portion (28) of the wearing face (21) and a assembly face (22) to the carrier body (12) include an interior of 100°.
- A wearing member according to one of claims 1 to 3 characterised in that the inner face (20) of the hard metal bar (13), which adjoins the carrier body (12), extends substantially perpendicularly to the first portion (25) of the wearing face.
- A wearing member according to claim 3 and claim 4 charcaterised in that the inner face (20) of the hard metal bar (13) and the assembly face (22) to the carrier body (12) include an interior angle of 115°.
- A wearing member according to one of claims 1 to 5 characterised in that the substantially plate-shaped carrier body (12) has a support face which is inclined at 40° for the assembly face (22) of the hard metal bar (13), the inner face (20) of which includes an angle of 105° with the adjoining side face (23) of the carrier bar (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT90105084T ATE90885T1 (en) | 1989-03-21 | 1990-03-17 | WEAR PART FOR AN IMPACT MILL ROTOR. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8903501U DE8903501U1 (en) | 1989-03-21 | 1989-03-21 | Wear part for an impact mill rotor |
| DE8903501U | 1989-03-21 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0388825A2 EP0388825A2 (en) | 1990-09-26 |
| EP0388825A3 EP0388825A3 (en) | 1990-12-19 |
| EP0388825B1 true EP0388825B1 (en) | 1993-06-23 |
Family
ID=6837352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90105084A Expired - Lifetime EP0388825B1 (en) | 1989-03-21 | 1990-03-17 | Wear element for an impact mill rotor |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0388825B1 (en) |
| AT (1) | ATE90885T1 (en) |
| DE (2) | DE8903501U1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11512809A (en) * | 1995-10-06 | 1999-11-02 | テクニカル・コンセプツ・リミテッド・パートナーシップ | Automatic cleaning valve |
| SE523598C3 (en) * | 2002-08-28 | 2004-06-09 | Sandvik Ab | Holder for a wear part in a crusher |
| CN112264149B (en) * | 2020-11-19 | 2021-12-14 | 贵州固鑫新材料有限公司 | Impact type sand making machine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT381246B (en) * | 1984-12-04 | 1986-09-10 | Wageneder Sbm Gmbh | IMPACT MILL FOR THE CRUSHING OF STONE OR THE LIKE. |
| AT390568B (en) * | 1986-10-30 | 1990-05-25 | Wageneder Sbm Gmbh | IMPACT MILL FOR CRUSHING STONE OD. DGL. |
-
1989
- 1989-03-21 DE DE8903501U patent/DE8903501U1/en not_active Expired
-
1990
- 1990-03-17 DE DE9090105084T patent/DE59001824D1/en not_active Expired - Fee Related
- 1990-03-17 EP EP90105084A patent/EP0388825B1/en not_active Expired - Lifetime
- 1990-03-17 AT AT90105084T patent/ATE90885T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE59001824D1 (en) | 1993-07-29 |
| EP0388825A2 (en) | 1990-09-26 |
| EP0388825A3 (en) | 1990-12-19 |
| DE8903501U1 (en) | 1989-05-11 |
| ATE90885T1 (en) | 1993-07-15 |
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