EP0209757B1 - Impact bar for an impact crusher rotor - Google Patents

Impact bar for an impact crusher rotor Download PDF

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Publication number
EP0209757B1
EP0209757B1 EP86108821A EP86108821A EP0209757B1 EP 0209757 B1 EP0209757 B1 EP 0209757B1 EP 86108821 A EP86108821 A EP 86108821A EP 86108821 A EP86108821 A EP 86108821A EP 0209757 B1 EP0209757 B1 EP 0209757B1
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EP
European Patent Office
Prior art keywords
impact bar
plane
bar according
constriction
symmetry
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EP86108821A
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German (de)
French (fr)
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EP0209757A3 (en
EP0209757A2 (en
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Hermann Schrödl
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SCHROEDL, HERMANN
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Individual
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Priority to AT86108821T priority Critical patent/ATE49514T1/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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/28—Shape or construction of beater elements
    • B02C13/2804—Shape or construction of beater elements the beater elements being rigidly connected to the rotor

Definitions

  • the invention relates to a blow bar for the rotor of an impact crusher or the like. Comminution machine with the features according to the preamble of claim 1.
  • a blow bar of this type is previously known from DE-PS 93 08 39.
  • This blow bar has a C-shaped or V-shaped cross-section in that the front side related to the direction of rotation of the rotor has an obtuse-angled recess or notch extending in the longitudinal direction .
  • This blow bar is clamped in the rotors that special clamping pieces reach into the recess and come to rest at the deepest point of the cut-out, which also means a constriction for the blow bar.
  • the associated rotor is also designed in such a way that the blow bar is supported with its continuously flat rear side - in relation to the rotor axis of rotation - outside the constriction under the action of tangential forces.
  • the invention has for its object to design a blow bar of the type mentioned so that a high security against breakage and in the holder against loads is achieved by both tangential and radial forces.
  • the object is achieved by the characterizing features of claim 1.
  • Blow bars in which the constriction is formed by grooves arranged on both sides, each of which has essentially planar mounting surfaces that extend inclined from the outside inwards towards the plane of symmetry, are already known, but they are not C-shaped curved. Above all, however, these known blow bars are not supported on the back of the rotor axis of rotation outside the constriction against the attack of tangential forces and are therefore inadequately secured against this load. In addition, the known blow bars, which have approximately the shape of a double T in cross section, are expensive in terms of material and thus also have a high weight.
  • the new blow bar has the particular advantage that it sits securely in its holder under the various types of load and has a high strength with a relatively low weight. This is achieved in particular in that in the area of the constriction, where the greatest bending stresses occur, these are considerably reduced by the fact that the rear side is supported outside the constriction in order to absorb tangential forces.
  • the new blow bar is also completely secured due to its favorable center of gravity and simultaneous mounting on both sides for radial forces against tilting movements that lead to premature wear.
  • the favorable ratio between strength and weight enables production costs to be reduced as a result of material savings.
  • the mounting surfaces are inclined from the outside inwards towards the plane of symmetry and are essentially flat.
  • the flat design ensures simple manufacture of the counter surfaces respectively arranged on the rotor.
  • This advantage is supported by the fact that the mounting surfaces are arranged not only on one but on both sides of the plane of symmetry at the same distance, and that outside of the inclined mounting surfaces - apart from the usual rounded edges - support surfaces for absorbing tangential forces.
  • these support surfaces are larger than the mounting surfaces and run essentially perpendicular to the plane of symmetry of the blow bar.
  • the security against tipping of the bar due to the radial forces occurring is further increased in that the front of the blow bar has a longitudinally continuous recess and that this recess springs back relative to the support surfaces.
  • contours of the blow bar which are on the outside in relation to the plane of symmetry, can be designed in accordance with the requirements resulting from the various materials to be shredded.
  • a further material saving is obtained if the outer corners of the back have a flat in the longitudinal direction that extends to the support surface, which is further reinforced by the fact that the flat has a longitudinally continuous depression.
  • the blow bar extends over the entire width of the rotor and is pushed into the blow bar receptacle from the end face of the rotor.
  • the blow bars particularly in the case of rotors of greater width, can also be divided in their longitudinal extent.
  • a blow bar 1 is held in the rotor 2 of an impact crusher by rails 3 and 4, which extend parallel to the axis of the rotor shaft 5 and in corresponding recesses 6 which extend transversely to the rotor axis and are even on the Length of the rotor distributed rotor disks 7 are attached.
  • the four recesses 6 and thus also the blow bars 1 are distributed uniformly over the outer circumference of the rotor disks 7.
  • the rails 3 and 4 each have a trapezoidal projection 8 and 9 tapering towards the blow bar 1, which extends into correspondingly shaped longitudinal grooves 10 and 11 the blow bar 1 engages in each case.
  • the rail 4 opposite the front side of the blow bar 1 in relation to the direction of rotation of the rotor is covered on its outer surface by a rotor protection plate 12 which is exchangeably fastened by screwing.
  • the grooves 10 and 11 of the blow bar 1 which is symmetrical and approximately C-shaped in terms of its cross section, each have a base area 13 and 14, which are arranged plane-parallel to one another and to each of which - in relation to their cross section - there is a mounting surface 15 on both ends and 16 connects, the inclination of the plane of symmetry 17 is 30 ° in each case.
  • All four support surfaces 15, 16 have the same size and are arranged at the same distance from the plane of symmetry 17.
  • Half of the distance between the base surfaces 13 and 14 lies on the plane of symmetry the surface focal point 18 of the blow bar cross section.
  • the surface 19 running through the center of gravity 18 perpendicular to the plane of symmetry 17 runs at least approximately at the same time through the axis of rotation of the rotor 2. From this it follows that - with appropriate consideration of the wear that occurs - on the brackets of the blow bar by radial forces in both directions practically no tilting moment is exercised and the bar "sits" extremely stable.
  • the support surfaces 20 arranged on the rear of the blow bar are larger than the support surfaces 21 arranged on the front and thus extend further outward from the plane of symmetry.
  • the support surface 20 lying outside in the installed state of the blow bar is opposite a screwed-on, that is to say replaceable support beam 22, which is embedded in the rail 3.
  • the support surface 21, which is diagonally opposite in relation to the surface center of gravity 18 and is therefore internal in the installed state, is opposite a counter support surface 23 of the rail 4, which likewise extends over the entire length of the blow bar or rail. Characterized in that the support beam 22 and the counter support surface 23 are acted upon under radial load, extremely low bending forces result in the area of the plane of symmetry 17, that is to say the constriction of the blow bar.
  • Continuous depressions 24 adjoin the front support surfaces 21 in the longitudinal direction, before the front protrudes continuously in the further course and thus forms the C-shape of the blow bar.
  • the edges 25 project outwards relative to the extension plane of the support surfaces 21.
  • the outer surfaces lying between the front and the back of the blow bar are arranged plane-parallel to one another in this exemplary embodiment.
  • blow bar 1 'differs from the blow bar 1 according to the previous embodiment only in that its outer surfaces 26' do not run plane-parallel to one another, but - apart from a small area piece adjoining the outer front edges 25 - converge towards the rear of the blow bar .
  • the angle of the wedge of the blow bar which acts on the material is practically reduced and the amount of material used is reduced.
  • FIG. 3 in which the blow bar 1 "differs from the blow bar 1 'according to FIG. 2 in that its rear support surfaces 20' are inclined outwards towards the front. The angle of inclination is based on on the vertical plane 19 about 15 ° .
  • the blow bar 1 '' shown in FIG. 4 like the blow bar 1 '', has support surfaces 20 'which are inclined towards the front, but the depressions 24' on its front, in contrast to the blow bars according to the other exemplary embodiments, do not spring back relative to the support surfaces 21 .
  • a flattening 28 is chamfered between their outer surfaces 26 'converging towards the rear and the rear supporting surfaces 20'.
  • blow bars can, if appropriate in individual cases, also be combined with one another in other ways.
  • the blow bars only need to be surface-processed on their support or support surfaces.
  • the blow bars can be provided in a known manner with recesses which advantageously start from the rear surface 13.
  • All suitable wear materials that can be subjected to bending stress can be considered as the material for the blow bars. As a rule, it is cast steel with high chromium and nickel contents. Because of the high stability of the new Beating bar against bending stresses, however, in cases of less high load, it is even possible to use material of lower bending strength, which is accordingly cheaper.
  • blow bars according to the invention can be used practically for crushing all types of rock, but in particular their use is advantageous for impact crushers for hard rock such as basalt, diabase, granite, gravel and the like. Rock types.

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

Abstract

An impact bar - adapted to assume an installed state in which it is mounted in a rotor of a comminuting machine - has a length extending generally radially as viewed relative to the rotary axis, a leading side and a trailing side as viewed relative to a direction of rotation, and a cross-sectional area taken along a sectional plane extending parallel to a plane of rotation. The cross-sectional area is curved in a generally C shape open towards the leading side and is symmetrical relative to a symmetry plane being generally perpendicular to the bar length. The cross-sectional area has a constriction lying in the symmetry plane. The trailing side is adapted to be supported against tangential forces at a location situated radially outwardly of the constriction as viewed relative to the rotary axis. The constriction is formed by a first and a second groove at the leading and trailing side. Each groove is cross-sectionally symmetrical to the symmetry plane and each has a groove bottom and lateral groove flanks constituting holding faces for taking up generally radially oriented forces.

Description

Die Erfindung bezieht sich auf eine Schlagleiste für den Rotor eines Prallbrechers o.dgl. Zerkleinerungsmaschine mit den Merkmalen nach dem Oberbegriff des Anspruchs 1.The invention relates to a blow bar for the rotor of an impact crusher or the like. Comminution machine with the features according to the preamble of claim 1.

Ein Schlagleiste dieser Art ist vorbekannt aus der DE-PS 93 08 39. Diese Schlagleiste hat eine im Querschnitt C- oder V-förmige Gestalt dadurch, daß die auf die Drehrichtung des Rotors bezogene Vorderseite eine sich in Längsrichtung erstreckende stumpfwinklige Ausnehmung bzw. Einkerbung aufweist. Diese Schlagleiste wird dadurch in den Rotors eingespannt, daß besondere Klemmstücke in die Ausnehmung hineingreifen und an der tiefsten Stelle der Ausnehmung, die gleichzeitig eine Einschnürung für die Schlagleiste bedeutet, zur Anlage kommen. Der zugehörige Rotor ist ferner so gestaltet, daß die Schlagleiste im Arbeitseinsatz mit ihrer durchgehend ebenen Rückseite - bezogen auf die Rotordrehachse - außerhalb der Einschnürung unter der Einwirkung tangentialer Kräfte abgestützt wird. Durch die geringe Materialstärke in der Leistenmitte, also im Bereich der Symmetrieebene, ist diese bekannte Schlagleiste stark bruchgefährdet. Wenn zur Abwendung dieses Übels die Einschnürung durch eine flachere Ausbildung der Ausnehmung eine größere Materialstärke erhält, ist die Halterung der Leiste gegen die in radialer Richtung wirkenden hohen Fliehkräfte nicht mehr hinreichend gesichert.A blow bar of this type is previously known from DE-PS 93 08 39. This blow bar has a C-shaped or V-shaped cross-section in that the front side related to the direction of rotation of the rotor has an obtuse-angled recess or notch extending in the longitudinal direction . This blow bar is clamped in the rotors that special clamping pieces reach into the recess and come to rest at the deepest point of the cut-out, which also means a constriction for the blow bar. The associated rotor is also designed in such a way that the blow bar is supported with its continuously flat rear side - in relation to the rotor axis of rotation - outside the constriction under the action of tangential forces. Due to the low material thickness in the middle of the ledge, i.e. in the area of the plane of symmetry, this known blow bar is very likely to break. If the constriction is given a greater material thickness due to a flatter design of the recess to avert this evil, the mounting of the bar is no longer adequately secured against the high centrifugal forces acting in the radial direction.

Der Erfindung liegt die Aufgabe zugrunde, eine Schlagleiste der eingangs genannten Art so zu gestalten, daß eine hohe Sicherheit gegen Bruch und in der Halterung gegenüber Belastungen sowohl durch tangentiale als auch durch radiale Kräfte erzielt wird. Die Aufgabe ist gelöst durch die kennzeichnenden Merkmale des Anspruchs 1.The invention has for its object to design a blow bar of the type mentioned so that a high security against breakage and in the holder against loads is achieved by both tangential and radial forces. The object is achieved by the characterizing features of claim 1.

Schlagleisten, bei der die Einschnürung durch beidseitig angeordnete Nuten gebildet ist, die jeweils von außen nach innen zur Symmetrieebene hin geneigt verlaufende, im wesentlichen ebene Halterungsflächen aufweisen, sind zwar bereits bekannt, jedoch sind diese nicht C-förmig gekrümmt ausgebildet. Vor allem sind diese bekannten Schlagleisten aber nicht an ihrer Rückseite von der Rotordrehachse aus außerhalb der Einschnürung gegenüber dem Angriff tangentialer Kräfte abgestützt und somit gegen diese Belastung unzureichend gesichert. Außerdem sind die bekannten Schlagleisten, welche im Querschnitt etwa die Form eines doppelten T aufweisen, materialaufwendig und weisen damit auch ein hohes Gewicht auf.Blow bars, in which the constriction is formed by grooves arranged on both sides, each of which has essentially planar mounting surfaces that extend inclined from the outside inwards towards the plane of symmetry, are already known, but they are not C-shaped curved. Above all, however, these known blow bars are not supported on the back of the rotor axis of rotation outside the constriction against the attack of tangential forces and are therefore inadequately secured against this load. In addition, the known blow bars, which have approximately the shape of a double T in cross section, are expensive in terms of material and thus also have a high weight.

Die neue Schlagleiste bringt vor allem den Vorteil, daß sie unter den verschiedenen Belastungsarten stabil in ihrer Halterung sitzt und bei verhältnismäßig geringem Gewicht eine hohe Festigkeit aufweist. Diese wird insbesondere dadurch erzielt, daß im Bereich der Einschnürung, wo die größten Biegespannungen auftreten, diese dadurch erheblich verringert werden, daß die Rückseite außerhalb der Einschnürung zur Aufnahme tangentialer Kräfte abgestützt ist. Die neue Schlagleiste ist ferner infolge günstiger Schwerpunktslage und gleichzeitiger beidseitiger Halterung für radiale Kräfte gegen Kippbewegungen, die zu vorzeitigem Verschleiß führen, vollständig gesichert. Ferner ist durch das günstige Verhältnis zwischen Festigkeit und Gewicht ein Senken der Herstellungskosten infolge Materialersparnis erzielbar.The new blow bar has the particular advantage that it sits securely in its holder under the various types of load and has a high strength with a relatively low weight. This is achieved in particular in that in the area of the constriction, where the greatest bending stresses occur, these are considerably reduced by the fact that the rear side is supported outside the constriction in order to absorb tangential forces. The new blow bar is also completely secured due to its favorable center of gravity and simultaneous mounting on both sides for radial forces against tilting movements that lead to premature wear. In addition, the favorable ratio between strength and weight enables production costs to be reduced as a result of material savings.

Besonders günstige Verhältnisse ergeben sich daraus, daß die Halterungsflächen von außen nach innen zur Symmetrieebene hin geneigt und im wesentlichen eben sind. Durch die ebene Ausbildung ist eine einfache Fertigung auch der am Rotor jeweils angeordneten Gegenflächen gewährleistet. Unterstützt wird dieser Vorteil dadurch, daß die Halterungsflächen nicht nur an einer, sondern zu beiden Seiten von der Symmetrieebene jeweils im gleichen Abstand angeordnet sind, und daß sich außen an die geneigten Halterungsflächen - abgesehen von den üblichen Kantenabrundungen - Stützflächen zur Aufnahme tangentialer Kräfte anschließen. Durch Anordnung dieser Stützflächen nicht nur an der Rückseite, sondern auch an der Vorderseite wird die Abstützung gegenüber radialen Kräften entsprechend erhöht. Mit Vorteil sind dabei diese Stützflächen größer als die Halterungsflächen ausgebildet und verlaufen im wesentlichen senkrecht zur Symmetrieebene der Schlagleiste.Particularly favorable conditions result from the fact that the mounting surfaces are inclined from the outside inwards towards the plane of symmetry and are essentially flat. The flat design ensures simple manufacture of the counter surfaces respectively arranged on the rotor. This advantage is supported by the fact that the mounting surfaces are arranged not only on one but on both sides of the plane of symmetry at the same distance, and that outside of the inclined mounting surfaces - apart from the usual rounded edges - support surfaces for absorbing tangential forces. By arranging these support surfaces not only on the back, but also on the front, the support against radial forces is increased accordingly. Advantageously, these support surfaces are larger than the mounting surfaces and run essentially perpendicular to the plane of symmetry of the blow bar.

Durch die vorteilhafte Formgebung bereitet es auch keinerlei Schwierigkeiten, die am Rotor angeordneten Gegenstützflächen jeweils gleich groß auszubilden. Die den geneigten Flächen der Schlagleiste gegenüberliegenden Gegenflächen des Rotors sind selbstverständlich jeweils mit den entsprechenden Neigungen versehen. Bevorzugte Werte für die Neigung der Halterungsflächen sind dabei im Anspruch 3 wiedergegeben.Due to the advantageous shape, there is no difficulty in designing the counter support surfaces arranged on the rotor to be of the same size. The counter surfaces of the rotor opposite the inclined surfaces of the blow bar are of course each provided with the corresponding inclinations. Preferred values for the inclination of the mounting surfaces are given in claim 3.

Die Sicherheit gegen ein Kippen der Leiste infolge der auftretenden radialen Kräfte wird noch weiter dadurch erhöht, daß die Vorderseite der Schlagleiste eine in Längsrichtung durchgehende Vertiefung auf weist und daß diese Vertiefung gegenüber den Stützflächen jeweils zurückspringt.The security against tipping of the bar due to the radial forces occurring is further increased in that the front of the blow bar has a longitudinally continuous recess and that this recess springs back relative to the support surfaces.

Die bezogen auf die Symmetrieebene außen liegenden Konturen der Schlagleiste können entsprechend den Anforderungen, die sich aus den zu zerkleinernden verschiedenen Materialien ergeben, ausgestaltet werden. Eine weitere Materialeinsparung ergibt sich, wenn die äußeren Ecken der Rückseite eine in Längsrichtung durchgehende, bis zur Stützfläche reichende Abflachung aufweisen, was noch dadurch verstärkt wird, daß die Abflachung eine in Längsrichtung durchgehende Vertiefung aufweist.The contours of the blow bar, which are on the outside in relation to the plane of symmetry, can be designed in accordance with the requirements resulting from the various materials to be shredded. A further material saving is obtained if the outer corners of the back have a flat in the longitudinal direction that extends to the support surface, which is further reinforced by the fact that the flat has a longitudinally continuous depression.

Im Regelfall erstreckt sich die Schlagleiste über die gesamte Breite des Rotors und wird in die Schlagleisten-Aufnahme von der Stirnseite des Rotors eingeschoben. Die Schlagleisten können jedoch, insbesondere bei Rotoren größerer Breite, in ihrer Längserstreckung auch unterteilt sein.As a rule, the blow bar extends over the entire width of the rotor and is pushed into the blow bar receptacle from the end face of the rotor. However, the blow bars, particularly in the case of rotors of greater width, can also be divided in their longitudinal extent.

In der Zeichnung sind vier Ausführungsbeispiele der Schlagleiste nach der Erfindung dargestellt und nachfolgend näher erläutert. Dabei zeigen

  • Fig. 1 den Ausschnitt eines Rotors eines Prallbrechers mit eingesetzter Schlagleiste im Schnitt quer zur Rotor-Längsachse,
  • Fig. 2 bis 4 drei weitere Ausführungen der Schlagleiste jeweils im Querschnitt.
In the drawing, four embodiments of the blow bar according to the invention are shown and explained in more detail below. Show
  • 1 shows the detail of a rotor of an impact crusher with an inserted blow bar in section transverse to the longitudinal axis of the rotor,
  • Fig. 2 to 4 three further versions of the blow bar each in cross section.

Wie aus Fig. 1 ersichtlich, ist eine Schlagleiste 1 im Rotors 2 eines Prallbrechers durch Schienen 3 und 4 gehalten, welche sich parallel zur Achse der Rotorwelle 5 erstrecken und in entsprechenden Ausnehmungen 6 der sich quer zur Rotor-Achse erstreckenden und an gleichmäßig auf die Länge des Rotors verteilten Rotorscheiben 7 befestigt sind. Die vier Ausnehmungen 6 und damit auch die Schlagleisten 1 verteilen sich gleichmäßig über den Außenumfang der Rotorscheiben 7. Die Schienen 3 und 4 weisen jeweils einen trapezförmigen, sich zur Schlagleiste 1 hin verjüngenden Vorsprung 8 und 9 auf, der in entsprechend geformte Längsnuten 10 und 11 der Schlagleisten 1 jeweils eingreift. Die der - bezogen auf die Rotor-Drehrichtung - vorderen Seite der Schlagleiste 1 gegenüberliegende Schiene 4 ist an ihrer Außenfläche durch eine Rotorschutzplatte 12 abgedeckt, die durch Anschrauben auswechselbar befestigt ist.As can be seen from Fig. 1, a blow bar 1 is held in the rotor 2 of an impact crusher by rails 3 and 4, which extend parallel to the axis of the rotor shaft 5 and in corresponding recesses 6 which extend transversely to the rotor axis and are even on the Length of the rotor distributed rotor disks 7 are attached. The four recesses 6 and thus also the blow bars 1 are distributed uniformly over the outer circumference of the rotor disks 7. The rails 3 and 4 each have a trapezoidal projection 8 and 9 tapering towards the blow bar 1, which extends into correspondingly shaped longitudinal grooves 10 and 11 the blow bar 1 engages in each case. The rail 4 opposite the front side of the blow bar 1 in relation to the direction of rotation of the rotor is covered on its outer surface by a rotor protection plate 12 which is exchangeably fastened by screwing.

Die Nuten 10 und 11 der bezogen auf ihren Querschnitt symmetrisch und etwa C-förmig ausgebildeten Schlagleiste 1 weisen jeweils eine Grundfläche 13 und 14 auf, die zueinander plan-parallel angeordnet sind und an welche sich - bezogen auf ihren Querschnitt - beidendig jeweils eine Halterungsfläche 15 und 16 anschließt, deren Neigung zur Symmetrieebene 17 jeweils 30° beträgt. Alle vier Halterungsflächen 15, 16 haben untereinander die gleiche Größe und sind von der Symmetrieebene 17 im gleichen Abstand angeordnet. Auf dem halben Abstand zwischen den Grundflächen 13 und 14 liegt auf der Symmetrieebene der Flächen-Schwerpunkt 18 des Schlagleisten-Querschnitts. Die durch den Schwerpunkt 18 senkrecht zur Symmetrieebene 17 verlaufende Fläche 19 läuft gleichzeitig zumindest annähernd durch die Drehachse des Rotors 2. Daraus ergibt sich, daß - bei entsprechender Berücksichtigung des auftretenden Verschleißes - auf die Halterungen der Schlagleiste durch radiale Kräfte in beiden Richtungen praktisch kein Kippmoment ausgeübt wird und die Leiste somit äußerst stabil "sitzt".The grooves 10 and 11 of the blow bar 1, which is symmetrical and approximately C-shaped in terms of its cross section, each have a base area 13 and 14, which are arranged plane-parallel to one another and to each of which - in relation to their cross section - there is a mounting surface 15 on both ends and 16 connects, the inclination of the plane of symmetry 17 is 30 ° in each case. All four support surfaces 15, 16 have the same size and are arranged at the same distance from the plane of symmetry 17. Half of the distance between the base surfaces 13 and 14 lies on the plane of symmetry the surface focal point 18 of the blow bar cross section. The surface 19 running through the center of gravity 18 perpendicular to the plane of symmetry 17 runs at least approximately at the same time through the axis of rotation of the rotor 2. From this it follows that - with appropriate consideration of the wear that occurs - on the brackets of the blow bar by radial forces in both directions practically no tilting moment is exercised and the bar "sits" extremely stable.

An die Halterungsflächen 15 und 16 schließen sich nach außen hin hinter den üblichen Eckabrundungen jeweils Stützflächen 20 und 21 an, welche jeweils parallel zur senkrechten Ebene 19 bzw. senkrecht zur Symmetrieebene 17 verlaufen. Die an der Rückseite der Schlagleiste angeordneten Stützflächen 20 sind größer als die an der Vorderseite angeordneten Stützflächen 21 und erstrecken sich somit von der Symmetrieebene aus weiter nach außen. Der im eingebauten Zustand der Schlagleiste außenliegenden Stützfläche 20 liegt ein angeschraubter, also auswechselbarer Stützbalken 22 gegenüber, der in die Schiene 3 eingebettet ist. Der bezogen auf den Flächenschwerpunkt 18 diagonal gegenüberliegenden, im eingebauten Zustand also innenliegenden Stützfläche 21 liegt eine Gegenstützfläche 23 der Schiene 4 gegenüber, die sich ebenfalls über die gesamte Schlagleisten- bzw. Schienenlänge erstreckt. Dadurch, daß unter radialer Belastung der Stützbalken 22 und gleichzeitig die Gegenstützfläche 23 beaufschlagt werden, ergeben sich im Bereich der Symmetrieebene 17, also der Einschnürung der Schlagleiste, äußerst geringe Biegekräfte.Support surfaces 20 and 21, which run parallel to the vertical plane 19 or perpendicular to the plane of symmetry 17, adjoin the mounting surfaces 15 and 16 to the outside behind the usual rounded corners. The support surfaces 20 arranged on the rear of the blow bar are larger than the support surfaces 21 arranged on the front and thus extend further outward from the plane of symmetry. The support surface 20 lying outside in the installed state of the blow bar is opposite a screwed-on, that is to say replaceable support beam 22, which is embedded in the rail 3. The support surface 21, which is diagonally opposite in relation to the surface center of gravity 18 and is therefore internal in the installed state, is opposite a counter support surface 23 of the rail 4, which likewise extends over the entire length of the blow bar or rail. Characterized in that the support beam 22 and the counter support surface 23 are acted upon under radial load, extremely low bending forces result in the area of the plane of symmetry 17, that is to say the constriction of the blow bar.

An die vorderseitigen Stützflächen 21 schließen sich nach außen hin in Längsrichtung durchgehende Vertiefungen 24 an, bevor in ihrem weiteren Verlauf die Vorderseite stetig nach vorn vorspringt und damit die C-Form der Schlagleiste bildet. Die äu- Beren vorderen Kanten 25, die eine Abrundung aufweisen, bilden den Scheitelpunkt eines Keils, der in ungebrauchtem Zustand der Schlagleiste etwa einen Winkel von 85° aufweist. Die Kanten 25 springen gegenüber der Verlängerungsebene der Stützflächen 21 nach außen vor. Die zwischen der Vorder- und der Rückseite der Schlagleiste liegenden Außenflächen sind bei diesem Ausführungsbeispiel plan-parallel zueinander angeordnet.Continuous depressions 24 adjoin the front support surfaces 21 in the longitudinal direction, before the front protrudes continuously in the further course and thus forms the C-shape of the blow bar. The outer front edges 25, which have a rounding, form the apex of a wedge, which in the unused state of the blow bar has an angle of approximately 85 ° . The edges 25 project outwards relative to the extension plane of the support surfaces 21. The outer surfaces lying between the front and the back of the blow bar are arranged plane-parallel to one another in this exemplary embodiment.

Daraus ergibt sich eine besonders starke Ausbildung der Schlagleiste für höchste Beanspruchungen. Zwischen den Außenflächen 26 und der Rückseite ist jeweils eine eine Vertiefung 27 aufweisende fasenartige Abflachung angeordnet, welche die Stabilität der Schlagleiste praktisch nicht schwächt.This results in a particularly strong training of the blow bar for the highest demands. Arranged between the outer surfaces 26 and the rear is a chamfer-like flattening 27, which practically does not weaken the stability of the blow bar.

Die Schlagleiste 1' unterscheidet sich von der Schlagleiste 1 nach dem vorhergehenden Ausführungsbeispiel lediglich dadurch, daß ihre Außenflächen 26' nicht plan-parallel zueinander verlaufen, sondern - abgesehen von einem kleinen an die äußeren vorderen Kanten 25 anschließenden Flächenstück - zur Rückseite der Schlagleiste hin konvergieren. Dadurch wird der Winkel des das Material beaufschlagenden Keiles der Schlagleiste praktisch verkleinert und der Aufwand an Material geringer. Eine weitere Materialeinsparung ergibt sich beim Ausführungsbeispiel nach Fig. 3, bei welchem die Schlagleiste 1" sich von der Schlagleiste 1' nach Fig. 2 dadurch unterscheidet, daß ihre rückseitigen Stützflächen 20' nach außen hin zur Vorderseite geneigt sind. Der Neigungswinkel beträgt bezogen auf auf die senkrechte Ebene 19 etwa 15°.The blow bar 1 'differs from the blow bar 1 according to the previous embodiment only in that its outer surfaces 26' do not run plane-parallel to one another, but - apart from a small area piece adjoining the outer front edges 25 - converge towards the rear of the blow bar . As a result, the angle of the wedge of the blow bar which acts on the material is practically reduced and the amount of material used is reduced. A further material saving results in the embodiment according to FIG. 3, in which the blow bar 1 "differs from the blow bar 1 'according to FIG. 2 in that its rear support surfaces 20' are inclined outwards towards the front. The angle of inclination is based on on the vertical plane 19 about 15 ° .

Die in Fig. 4 dargestellte Schlagleiste 1'" weist ebenso wie die Schlagleiste 1" zur Vorderseite hin geneigte Stützflächen 20' auf, die Vertiefungen 24' an ihrer Vorderseite springen jedoch im Gegensatz zu den Schlagleisten nach den anderen Ausführungsbeispielen gegenüber den Stützflächen 21 nicht zurück. Zwischen ihren zur Rückseite hin konvergierenden Außenflächen 26' und den rückseitigen Stützflächen 20' ist jeweils eine Abflachung 28 angefast.The blow bar 1 '' shown in FIG. 4, like the blow bar 1 '', has support surfaces 20 'which are inclined towards the front, but the depressions 24' on its front, in contrast to the blow bars according to the other exemplary embodiments, do not spring back relative to the support surfaces 21 . A flattening 28 is chamfered between their outer surfaces 26 'converging towards the rear and the rear supporting surfaces 20'.

Die Merkmale der beschriebenen Ausführungsbeispiele von Schlagleisten können, wenn es im Einzelfall zweck mäßig ist, auch auf andere Weise miteinander kombiniert werden. Die Schlagleisten brauchen lediglich an ihren Stütz- bzw. Auflageflächen oberflächenbearbeitet zu werden. Zur Aufnahme von Schubkräften, die in Richtung der Rotorachse wirken, können die Schlagleisten in bekannter Weise mit Ausnehmungen versehen sein, die vorteilhaft von der rückseitigen Grundfläche 13 ausgehen.The features of the described exemplary embodiments of blow bars can, if appropriate in individual cases, also be combined with one another in other ways. The blow bars only need to be surface-processed on their support or support surfaces. In order to absorb thrust forces which act in the direction of the rotor axis, the blow bars can be provided in a known manner with recesses which advantageously start from the rear surface 13.

Als Werkstoff für die Schlagleisten kommen alle geeigneten biegebeanspruchbaren Verschleißwerkstoffe in Betracht. Im Regelfall handelt es sich dabei um Stahlguß mit hohen Gehalten an Chrom und Nickel. Wegen der hohen Stabilität der neuen Schlagleiste gegenüber Biegebeanspruchungen ist es jedoch in Fällen weniger hoher Belastung sogar möglich, Material von geringerer Biegefestigkeit, das dementsprechend billiger ist, einzusetzen.All suitable wear materials that can be subjected to bending stress can be considered as the material for the blow bars. As a rule, it is cast steel with high chromium and nickel contents. Because of the high stability of the new Beating bar against bending stresses, however, in cases of less high load, it is even possible to use material of lower bending strength, which is accordingly cheaper.

Die Schlagleisten nach der Erfindung sind praktisch für die Zerkleinerung sämtlicher Gesteinsarten einsetzbar, insbesondere ist ihr Einsatz jedoch vorteilhaft bei Prallbrechern für Hartgestein wie Basalt, Diabas, Granit, Kies u.ä. Gesteinsarten.The blow bars according to the invention can be used practically for crushing all types of rock, but in particular their use is advantageous for impact crushers for hard rock such as basalt, diabase, granite, gravel and the like. Rock types.

Claims (13)

1. Impact bar for the rotor (2) of an impact crusher or like comminuting machine; having a cross-sectional area transverse to its elongation curved in a general C-shape open towards the leading side and having a constriction lying in its symmetry plane; its trailing side being adapted to be supported against tangential forces at a location situated radially outwardly of said constriction as viewed relative to said rotary axis;
characterised in that the constriction is formed by grooves (10, 11) at opposite sides which by virtue of their cross-sections at both flanks provide holding faces for taking up radial forces, wherein the holding faces (15, 16) are substantially planar and are inclined towards said symmetry plane from outside to inside, and wherein a support face (20, 21) adjoins each of the inclined holding faces (15, 16) externally for taking up tangential forces.
2. Impact bar as defined in claim 1, characterised in that the angle of inclination of the holding faces (15, 16) is 20-50°, preferably 30 to 40° in relation to the symmetry plane (17).
3. Impact bar according to claim 1 or 2, characterised in that the holding faces (15, 16) are equidistant in relation to the symmetry plane (17).
4. Impact bar according to any of claims 1 to 3, characterised in that the support faces (20, 21) have a larger area than the holding faces (15, 16).
5. Impact bar according to any one of claims 1 to 4, characterised in that at least the support faces (21) provided on the leading side extend substantially normal to the plane of symmetry.
6. Impact bar according to any one of claims 1 to 5, characterised in that the leading side comprises a depression (24, 24') extending continuously longitudinally.
7. Impact bar according to claim 6, characterised in that the depression (24) is recessed in relation to each of the support faces.
8. Impact bar according to any of the preceding claims, characterised in that the outer edges of the leading sides. - viewed in cross section - form a acute angle.
9. Impact bar according to any one of the preceding claims, characterised in that the support faces (20') on the trailing side are inclined outwardly towards the leading side.
10. Impact bar according to claim 9, characterised in that the inclination is 5 to 30°, preferably 10 to 20° in relation to a line normal to the plane of symmetry (17).
11. Impact bar according to any one of the preceding claims, characterised in that the plane base surfaces (13, 14) of the grooves (10, 11) provided on both sides extend plane-parallel in relation to one another.
12. Impact bar according to any one of the preceding claims, characterised in that the outer corners of the trailing side comprise a flattened region (28) extending longitudinally continuously up to the support surface (20') on the trailing side.
13. Impact bar according to claim 12, characterised in that the flattened region comprises a depression (27) extending continuously in the longitudinal direction.
EP86108821A 1985-07-17 1986-06-28 Impact bar for an impact crusher rotor Expired - Lifetime EP0209757B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86108821T ATE49514T1 (en) 1985-07-17 1986-06-28 BLOW BAR FOR AN IMPACT CRUSHER ROTOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3525442A DE3525442C2 (en) 1985-07-17 1985-07-17 Blow bar for an impact crusher rotor
DE3525442 1985-07-17

Publications (3)

Publication Number Publication Date
EP0209757A2 EP0209757A2 (en) 1987-01-28
EP0209757A3 EP0209757A3 (en) 1987-09-02
EP0209757B1 true EP0209757B1 (en) 1990-01-17

Family

ID=6275943

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86108821A Expired - Lifetime EP0209757B1 (en) 1985-07-17 1986-06-28 Impact bar for an impact crusher rotor

Country Status (6)

Country Link
US (1) US4714207A (en)
EP (1) EP0209757B1 (en)
AT (1) ATE49514T1 (en)
CA (1) CA1262712A (en)
DE (1) DE3525442C2 (en)
ZA (1) ZA865324B (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT392740B (en) * 1985-12-03 1991-05-27 Schroedl Hermann BOW BAR FOR IMPACT CRUSHERS OD. DGL. CRUSHING MACHINES
AT394147B (en) * 1987-10-08 1992-02-10 Noricum Maschinenbau Handel IMPACT MILL
US4826090A (en) * 1987-11-09 1989-05-02 Orphall Axel W Hammer assembly for a rotary material crusher
DE3742395C1 (en) * 1987-12-15 1989-06-15 Deutscher Sbm Vertrieb Franz W Rotor for an impact mill
US5320292A (en) * 1992-11-06 1994-06-14 Smith Roger G Mounting for replaceable hammers in impact crusher
AT402371B (en) * 1993-07-12 1997-04-25 Schroedl Hermann ROTOR FOR A CRUSHING MACHINE
BE1009998A3 (en) * 1996-02-02 1997-11-04 Magotteaux Int Rotor for a crusher percussion.
DE19813308C2 (en) * 1998-03-26 2002-02-28 Hazemag & Epr Gmbh Blow bar for impact mill rotors and rotor for impact mills
US6955312B2 (en) * 2002-12-20 2005-10-18 Equipments Lan-Ro Inc. Apparatus and method for comminuting rock
DE102014225479B4 (en) * 2014-12-10 2017-04-13 Craco Gmbh ROTOR AND METHOD FOR REPAIRING A ROTOR
IT201600094638A1 (en) * 2016-09-21 2018-03-21 Seppi M Ag S P A Tool in a tool holder for shredders / milling machines
DE102017113238B4 (en) * 2017-06-16 2020-09-24 Keestrack N.V. Blow bar, rotor and impact crusher
DE202017107107U1 (en) * 2017-11-23 2017-11-29 Keestrack N.V. rasp bar

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GB475430A (en) * 1936-06-02 1937-11-19 George Henry Pattinson Improvements in or relating to hammers for impact breaking or crushing machines
DE930839C (en) * 1951-10-11 1955-07-25 Westfalia Dinnendahl Groeppel Rotor for centrifugal mills
US2747803A (en) * 1952-07-09 1956-05-29 Pettibone Mulliken Corp Hammer rotor for hammermills
FR1537209A (en) * 1967-07-24 1968-08-23 Device for holding hammers placed in the rotor cavities of crushers and fine impact crushers
AT289522B (en) * 1968-03-14 1971-04-26 Franz Wageneder Impact mill
AT325398B (en) * 1972-09-21 1975-10-27 Ver Edelstahlwerke Ag BLOW ROLLERS FOR IMPACT MILLS
DE2317692B2 (en) * 1973-04-07 1978-07-27 Bhs-Bayerische Berg-, Huetten- Und Salzwerke Ag, 8000 Muenchen Impact tool made of composite metal for impact and hammer crushers
AT351906B (en) * 1978-05-02 1979-08-27 Voest Ag BLOW BAR BRACKET FOR THE ROTOR OF AN IMPACT MILL
US4373678A (en) * 1980-06-30 1983-02-15 Reitter Guenther W Rotary impact crusher having a continuous rotary circumference
GB2110113A (en) * 1981-11-12 1983-06-15 Dresser Europe Sa Impeller bar for hammer type mill

Also Published As

Publication number Publication date
ZA865324B (en) 1987-03-25
DE3525442C2 (en) 1994-10-20
EP0209757A3 (en) 1987-09-02
US4714207A (en) 1987-12-22
CA1262712A (en) 1989-11-07
DE3525442A1 (en) 1987-01-22
ATE49514T1 (en) 1990-02-15
EP0209757A2 (en) 1987-01-28

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