WO2002009878A1 - Impeller for centrifugal crushers with vertical axis and method for making same - Google Patents

Impeller for centrifugal crushers with vertical axis and method for making same Download PDF

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Publication number
WO2002009878A1
WO2002009878A1 PCT/BE2000/000091 BE0000091W WO0209878A1 WO 2002009878 A1 WO2002009878 A1 WO 2002009878A1 BE 0000091 W BE0000091 W BE 0000091W WO 0209878 A1 WO0209878 A1 WO 0209878A1
Authority
WO
WIPO (PCT)
Prior art keywords
impactor
pockets
wear
reinforcing structure
ceramic
Prior art date
Application number
PCT/BE2000/000091
Other languages
French (fr)
Inventor
Claude Poncin
Original Assignee
Magotteaux International S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Magotteaux International S.A. filed Critical Magotteaux International S.A.
Priority to DE60019346T priority Critical patent/DE60019346T2/en
Priority to HU0301785A priority patent/HU226990B1/en
Priority to PT00951123T priority patent/PT1305116E/en
Priority to ES00951123T priority patent/ES2235923T3/en
Priority to JP2002515420A priority patent/JP4084996B2/en
Priority to PCT/BE2000/000091 priority patent/WO2002009878A1/en
Priority to SK1767-2002A priority patent/SK286255B6/en
Priority to CA002412314A priority patent/CA2412314C/en
Priority to CZ20024016A priority patent/CZ298653B6/en
Priority to KR1020037000067A priority patent/KR100672270B1/en
Priority to AU6417700A priority patent/AU6417700A/en
Priority to EP00951123A priority patent/EP1305116B1/en
Priority to MXPA03001000A priority patent/MXPA03001000A/en
Priority to CNB008197660A priority patent/CN1246080C/en
Priority to PL00364776A priority patent/PL195796B1/en
Priority to AT00951123T priority patent/ATE292520T1/en
Priority to AU2000264177A priority patent/AU2000264177B2/en
Publication of WO2002009878A1 publication Critical patent/WO2002009878A1/en

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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
    • B02C13/1814—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 on top of a disc type rotor
    • B02C13/1828—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 on top of a disc type rotor with dead bed protected beater or impeller elements
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • B02C4/08—Crushing or disintegrating by roller mills with two or more rollers with co-operating corrugated or toothed crushing-rollers

Definitions

  • the present invention relates to an impactor (also called an ejector or “impeller”), intended for so-called VSI (Vertical Shaft Impacter) crushers, that is to say centrifugal crushers with vertical axis and comprising a reinforcing structure.
  • VSI Vertical Shaft Impacter
  • Crushers of the aforementioned type are well known and widely used for crushing rock aggregates, inter alia in quarries and cement factories. Reference is made to it in document WO 99/47264 and in other documents cited in this publication.
  • the centrifugal crushers include a cylindrical tank in which is disposed a rotary table which is supported by a vertical bearing and which comprises means for rotating the table around the central axis of the crusher .
  • the crusher comprises a series of impactors or ejectors fixed to the rotary table, as well as a series of anvils arranged on the internal vertical wall of the cylindrical tank around the rotary table.
  • the impactor is most often in the form of a parallelepiped generally made of cast iron which is fixed to the rotary table of the crusher.
  • the face of the impactor which is directed towards the axis of rotation of the table is called the nose of the impactor, while the opposite face of the anvils fixed on the cylindrical tank forms the exit face of the impactor.
  • the front face of one impactor called the working face is that which meets the material to be crushed and which in the direction of rotation of the impactor precedes the rear face.
  • This front working face of the impactor can be provided with one or more cavities which do not cross the entire structure of the impactor and which form pockets which fill with material during the rotation of the crusher and thus protect the impactor from impact and wear, under the effect of the material accumulated in the pockets.
  • the material to be crushed is poured into the center of the rotary table by known means. Under the effect of centrifugal force and under the impact with said working face, the material is projected towards the anvils on which it is crushed to fall, in crushed form, to the bottom of the crusher from where it is discharged . During the projection of the material, the impactors are subjected to very high stresses and are therefore subject to rapid wear.
  • the pocket impactors used make it possible in certain applications, by accumulating material in the pockets, to considerably increase the life of the impactors. Due to the fact that in this type of impactor, it is observed that the wear is preferably done at the level of the exit edge of the pockets, that is to say where the abrasion due to the particles projected by the force centrifugal is the highest. Document W099 / 47264 already mentioned, as well as various documents cited therein, provide protections or reinforcements to avoid or reduce these wear effects.
  • the specific solution proposed in W099 / 47264 namely the manufacture of an impactor with one or more pockets having an essentially parallelepiped shape consists of creating over the entire periphery of the pocket or pockets or on a part thereof , a reinforcing structure of a composite material itself obtained from an iron-based alloy and very wear-resistant ceramic grains.
  • This structure which is formed in situ when the impactor is cast by the infiltration of the liquid metal used to form the body of the part in a mass of ceramic grains and binder, has been found to be particularly effective in ensuring a duration of increased impactor operation.
  • the pockets are empty and not protected by the material to be ground.
  • the thin walls are particularly exposed to the impacts of larger aggregates or foreign bodies (pieces of steel, shovel teeth, etc.). This can lead to the rupture of the most fragile reinforced walls, which seriously damages the part and often requires having to replace it very quickly after the first commissioning.
  • the invention aims to solve the problems mentioned above and, in particular, to further improve the performance of the impactors by taking advantage of the intrinsic advantages of the technology for manufacturing the impactors described in document WO99 / 47264.
  • Main characteristic elements of the invention The invention proposes an impactor intended for vertical axis centrifugal crushers which, unlike those of the aforementioned prior art, does not deliberately comprise initially, it is that is to say during the first commissioning, no cavities or pockets, but which is provided on its working face with a reinforcing structure consisting of a composite material obtained from an iron-based alloy and ceramic grains very resistant to wear and formed in situ when the impactor is poured by infiltration of the liquid metal used to form the body of the part in a mass of ceramic grains and binder.
  • Said reinforcing structure is provided on the working face in an adequate geometrical arrangement in order to let the metal outcrop locally (that is to say in the zones without reinforcing structure) up to the working surface, so that wear in service automatically causes the formation of pockets or cavities which, when filled with crushed material, exert a shock protection function, while maintaining the reinforcing structure at the upper periphery of the pockets which are thus formed , that is, on the work surface.
  • the impactor obtained makes it possible to entirely solve the aforementioned problems.
  • the amount of metal available for infiltrating the support is, in the case of the invention, all of the metal constituting the part instead of being only the metal constituting a single wall.
  • the technique of the invention makes it possible to significantly improve the service life because as soon as the formation of the pockets is initiated, one already benefits from one self-protection due to the material retained in these pockets in formation.
  • the progression of the formation of pockets is slowed down and when we arrive at the complete formation of these, we have gained in lifespan all the time necessary for this training.
  • W099 / 47264 of a reinforcing structure made of a composite material, obtained in situ by the infiltration of a liquid metal into a ceramic mass with the facilities and advantages of the production of a part, without the obligation to provide one or more pockets.
  • the method used is particularly simple to implement since it suffices to fix in the bottom of a mold, by conventional means such as gluing, mechanical fixing, nails, screws, anchor rods or others depending on the geometrical arrangement desired to subsequently allow the formation of one or more pockets by wear, a lining of wear-resistant technical ceramic material, preferably in the form of a mass of ceramic grains based on alumina and zirconia and d a binder, and then casting the metallic mass used to form the body of ⁇ impactor.
  • This metal by infiltrating the ceramic mass, ensures its perfect connection with the cast part during the cooling of the part. Then it is enough to unmold the part and, after a possible finishing (deburring etc.), the impactor can be directly put into service.
  • Figure 1 a perspective view of a pocket impactor according to the prior art, with ceramic reinforcement infiltrated by metal;
  • Figure 2 a perspective view of an impactor with the same type of reinforcement and without pockets, according to the present invention
  • Figure 3 a longitudinal sectional view of an impactor according to Figure 2 with the evolutionary outline of the profile of the pockets during their formation. Description of a preferred embodiment of the invention Identical reference marks are used in the different figures for identical or similar constituent elements.
  • a conventional pocket impactor 1 Has one or more pockets, in this case the two pockets 2 and 2 'made of foundry, before the impactor 1 is put into service.
  • This impactor advantageously includes reinforcements 4 in infiltrated ceramic.
  • the nose 6 of the impactor and the outlet face 7 of the impactor which are in principle also highly stressed, may include additional reinforcements, such as the reinforcement 8 shown in FIG. 1.
  • the impactor 1 is designed before commissioning as a solid piece, without pockets on its working face 5, but provided with reinforcements 4 made of foundry.
  • These reinforcements can be arranged, - as shown in the view of Figure 2, in a shape and an arrangement similar to those provided in the figure
  • the invention therefore provides a simple solution to various technical problems of producing impactors, in particular greater freedom of design thereof.
  • the execution of the recommended technique is moreover inexpensive.
  • the cost of the additional cast iron to be used is largely offset by the increased operating time, the ease of execution and the absence of the need to provide specific means for creating the pockets during the casting of the part.
  • Additional reinforcements for the nose and the exit face of the impactor can also be provided in the embodiment of the invention, in particular of the Figures 2 and 3. They are not shown there, only for the sake of clarity of the drawing.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Tunnel Furnaces (AREA)
  • Secondary Cells (AREA)
  • Ceramic Capacitors (AREA)
  • Centrifugal Separators (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

The invention concerns an impeller for centrifugal crushers with vertical axis. Initially, that is when it is used for the first time, said impeller (1) does not comprise cavities or pockets, but it is provided on its working surface (5) with a reinforcing structure (4), made of a composite material obtained from an alloy based on iron and ceramic grains with high wear resistance and formed on site when the impeller is cast by infiltrating molten metal for forming the part body in a mass of ceramic grains and binder. The wear to which it is subjected in operating automatically causes pockets or cavities to be formed which, when they are filled with crushed material, act as a protection against impacts.

Description

IMPACTEUR DESTINE A DES CONCASSEURS CENTRIFUGES A AXE VERTICAL ET PROCEDE DE PRODUCTION IMPACTOR FOR VERTICAL AXIS CENTRIFUGAL CRUSHERS AND PRODUCTION METHOD
Objet de l'invention [0001] La présente invention concerne un impacteur (également appelé éjecteur ou « impeller » ), destiné à des concasseurs dits VSI (Vertical Shaft Impacter) , c'est-à- dire des concasseurs centrifuge à axe vertical et comportant une structure de renfort.OBJECT OF THE INVENTION The present invention relates to an impactor (also called an ejector or "impeller"), intended for so-called VSI (Vertical Shaft Impacter) crushers, that is to say centrifugal crushers with vertical axis and comprising a reinforcing structure.
Arrière-plan technologique à la base de l' invention [0002] Les concasseurs du type précité sont bien connus et largement utilisés pour concasser des agrégats de roches, entre autres dans les carrières et les cimenteries. [0003] Il y est fait référence dans le document WO 99/47264 et dans d'autres documents cités dans cette publication.Technological background underlying the invention [0002] Crushers of the aforementioned type are well known and widely used for crushing rock aggregates, inter alia in quarries and cement factories. Reference is made to it in document WO 99/47264 and in other documents cited in this publication.
[0004] Dans ces documents, il est indiqué que les concasseurs centrifuge comprennent une cuve cylindrique dans laquelle est disposée une table rotative qui est supportée par un palier vertical et qui comprend des moyens pour faire tourner la table autour de l'axe central du concasseur. Le concasseur comporte une série d' impacteurs ou éjecteurs fixés sur la table rotative, ainsi qu'une série d'enclumes disposées sur la paroi verticale interne de la cuve cylindrique autour de la table rotative.In these documents, it is indicated that the centrifugal crushers include a cylindrical tank in which is disposed a rotary table which is supported by a vertical bearing and which comprises means for rotating the table around the central axis of the crusher . The crusher comprises a series of impactors or ejectors fixed to the rotary table, as well as a series of anvils arranged on the internal vertical wall of the cylindrical tank around the rotary table.
[0005] L' impacteur se présente le plus souvent sous la forme d'un parallélépipède réalisé généralement en fonte qui est fixé sur la table rotative du concasseur. La face de 1 ' impacteur qui est dirigée vers 1 ' axe de rotation de la table est appelée le nez de l' impacteur, tandis que la face en regard des enclumes fixées sur la cuve cylindrique forme la face de sortie de l' impacteur. [0006] La face avant de 1 ' impacteur appelée face de travail est celle qui rencontre la matière à concasser et qui dans le sens de la rotation de 1 ' impacteur précède la face arrière. [0007] Cette face de travail avant de 1 ' impacteur peut être pourvue d'une ou de plusieurs cavités qui ne traversent pas la totalité de la structure de 1 ' impacteur et qui forment des poches qui se remplissent de matière lors de la rotation du concasseur et protègent ainsi 1' impacteur des chocs et de l'usure, sous l'effet de la matière accumulée dans les poches.The impactor is most often in the form of a parallelepiped generally made of cast iron which is fixed to the rotary table of the crusher. The face of the impactor which is directed towards the axis of rotation of the table is called the nose of the impactor, while the opposite face of the anvils fixed on the cylindrical tank forms the exit face of the impactor. The front face of one impactor called the working face is that which meets the material to be crushed and which in the direction of rotation of the impactor precedes the rear face. This front working face of the impactor can be provided with one or more cavities which do not cross the entire structure of the impactor and which form pockets which fill with material during the rotation of the crusher and thus protect the impactor from impact and wear, under the effect of the material accumulated in the pockets.
[0008] Lors de l'opération de concassage, la matière à concasser est versée au centre de la table rotative par des moyens connus. Sous l'effet de la force centrifuge et sous l'impact avec ladite face de travail, la matière est projetée en direction des enclumes sur lesquelles elle s'écrase pour tomber, sous forme concassée, au fond du concasseur d'où elle est évacuée. Lors de la projection de la matière, les impacteurs subissent des sollicitations très importantes et sont dès lors sujets à une usure rapide.[0008] During the crushing operation, the material to be crushed is poured into the center of the rotary table by known means. Under the effect of centrifugal force and under the impact with said working face, the material is projected towards the anvils on which it is crushed to fall, in crushed form, to the bottom of the crusher from where it is discharged . During the projection of the material, the impactors are subjected to very high stresses and are therefore subject to rapid wear.
[0009] Les impacteurs à poches utilisés permettent dans certaines applications, par le fait d'accumuler de la matière dans les poches, d'augmenter considérablement la durée de vie des impacteurs . [0010] Du fait que dans ce type d' impacteur, on observe que l'usure se fait préferentiellement au niveau du bord de sortie des poches, c'est-à-dire là où l'abrasion due aux particules projetées par la force centrifuge est la plus élevée. [0011] Le document W099/47264 déjà mentionné, ainsi que divers documents qui y sont cités, proposent des protections ou renforts pour éviter ou réduire ces effets d'usure . [0012] La solution spécifique proposée dans W099/47264, à savoir la fabrication d'un impacteur à une ou plusieurs poches ayant une forme essentiellement parallélépipédique consiste à créer sur toute la périphérie de la ou des poches ou sur une partie de celle-ci, une structure de renfort d'un matériau composite lui même obtenu à partir d'un alliage à base fer et de grains de céramique très résistants à l'usure. Cette structure qui est formée in situ à la coulée de l' impacteur par l'infiltration du métal liquide servant à former le corps de la pièce dans une masse de grains céramiques et de liant, s'est révélée particulièrement efficace pour assurer une durée de fonctionnement accrue de l' impacteur.The pocket impactors used make it possible in certain applications, by accumulating material in the pockets, to considerably increase the life of the impactors. Due to the fact that in this type of impactor, it is observed that the wear is preferably done at the level of the exit edge of the pockets, that is to say where the abrasion due to the particles projected by the force centrifugal is the highest. Document W099 / 47264 already mentioned, as well as various documents cited therein, provide protections or reinforcements to avoid or reduce these wear effects. The specific solution proposed in W099 / 47264, namely the manufacture of an impactor with one or more pockets having an essentially parallelepiped shape consists of creating over the entire periphery of the pocket or pockets or on a part thereof , a reinforcing structure of a composite material itself obtained from an iron-based alloy and very wear-resistant ceramic grains. This structure, which is formed in situ when the impactor is cast by the infiltration of the liquid metal used to form the body of the part in a mass of ceramic grains and binder, has been found to be particularly effective in ensuring a duration of increased impactor operation.
[0013] Malgré le progrès technique considérable et les avantages technologiques importants que présente ce type de fabrication, certaines limitations ou difficultés sont apparues .Despite the considerable technical progress and the significant technological advantages of this type of manufacturing, certain limitations or difficulties have appeared.
[0014] On notera tout d'abord que pour obtenir une renforcement efficace, 'le support constitué de grains céramiques et de liant doive être parfaitement infiltré par le métal .It will be noted first of all that in order to obtain effective reinforcement, ' the support consisting of ceramic grains and binder must be perfectly infiltrated by the metal.
[0015] Il faut donc prévoir une épaisseur de métal suffisante de part et d'autre du support pour avoir une bonne infiltration du constituant céramique de la structure de renfort. Ceci nécessite de conserver une bonne épaisseur des parois de la pièce en matière composite et, par voie de conséquence, limite la dimension des poches. Ceci amène aussi à devoir limiter l'épaisseur du renfort céramique pour améliorer l'infiltration ; cette limitation d'épaisseur du renfort rend celui-ci moins efficace et plus fragile .It is therefore necessary to provide a sufficient metal thickness on either side of the support to have good infiltration of the ceramic component of the reinforcing structure. This requires maintaining a good thickness of the walls of the part made of composite material and, consequently, limits the size of the pockets. This also leads to having to limit the thickness of the ceramic reinforcement to improve the infiltration; this limitation in thickness of the reinforcement makes it less effective and more brittle .
[0016] De plus, aussi bien dans le cas d' impacteurs à une poche que dans le cas d' impacteurs à plusieurs poches, lors du premier démarrage, les poches sont vides et non protégées par de la matière à broyer.In addition, both in the case of impacters with a pocket and in the case of impactors with several pockets, during the first start-up, the pockets are empty and not protected by the material to be ground.
[0017] A ce moment, les parois fines sont particulièrement exposées aux impacts d'agrégats les plus gros ou de corps étrangers (morceaux d'acier, dents de pelles, etc) . [0018] Ceci peut conduire à la rupture des parois renforcées les plus fragiles, ce qui endommage gravement la pièce et nécessite souvent de devoir la remplacer très rapidement après la première mise en service .At this time, the thin walls are particularly exposed to the impacts of larger aggregates or foreign bodies (pieces of steel, shovel teeth, etc.). This can lead to the rupture of the most fragile reinforced walls, which seriously damages the part and often requires having to replace it very quickly after the first commissioning.
[0019] Dans les concasseurs à axe vertical, on observe également que le profil d'usure est généralement peu contrôlable, car les conditions de fonctionnement dépendent de divers paramètres qui eux-mêmes changent au cours du temps, tels que : granulométrie à l'alimentation, abrasivité des agrégats, etc. : [0020] Avec la solution proposée dans le document W099/47264, une modification de la forme des poches demande une modification complète des modèles de fonderie et des boîtes à noyaux, sans possibilité de prédiction du résultat que l'on va obtenir. [0021] Ces opérations sont de plus très coûteuses et entraînent de grandes pertes de temps .In the vertical axis crushers, it is also observed that the wear profile is generally not very controllable, because the operating conditions depend on various parameters which themselves change over time, such as: particle size with feed, aggregate abrasiveness, etc. : With the solution proposed in document W099 / 47264, a modification of the shape of the pockets requires a complete modification of the foundry models and of the core boxes, without the possibility of predicting the result that will be obtained. These operations are moreover very expensive and cause great loss of time.
[0022] Par ailleurs, si on souhaite modifier le profil des poches, on est aussi limité dans la forme choisie liée à la difficulté d'infiltration pré-mentionnée . [0023] Finalement, l'usure des impacteurs dans les concasseurs VSI reste malgré tout un problème majeur car les sollicitations d'abrasion et de chocs sont excessivement sévères. Augmenter la durée de vie des impacteurs constitue un souci constant. Buts vises par l' inventionFurthermore, if one wishes to modify the profile of the pockets, one is also limited in the form chosen linked to the difficulty of pre-mentioned infiltration. Finally, the wear of the impactors in the VSI crushers remains despite everything a major problem because the stresses of abrasion and shocks are excessively severe. Extending the life of impactors is a constant concern. Goals of the invention
[0024] L'invention vise à résoudre les problèmes mentionnés ci-dessus et, en particulier, d'encore améliorer les performances des impacteurs en profitant des avantages intrinsèques de la technologie de fabrication des impacteurs décrits dans le document W099/47264. Principaux éléments caractéristiques de 1 ' invention [0025] L'invention propose un impacteur destiné à des concasseurs centrifuges à axe vertical qui, à la différence de ceux de l'état de la technique précité, ne comporte de manière délibérée initialement, c'est-à-dire lors de la première mise en service, pas de cavités ou poches, mais qui est pourvu sur sa face de travail d'une structure de renfort constituée d'un matériau composite obtenu à partir d'un alliage à base de fer et de grains de céramique très résistants à l'usure et formée in situ à la coulée de l' impacteur par infiltration du métal liquide servant à former le corps de la pièce dans une masse de grains céramiques et de liant. [0026] Ladite structure de renfort est prévue sur la face de travail selon une disposition géométrique adéquate afin de laisser le métal affleurer localement (c'est-à-dire dans les zones sans structure de renfort) jusqu'à la surface du travail, de manière que l'usure en service provoque automatiquement la formation de poches ou cavités qui, en se remplissant de matière broyée, exercent une fonction de protection aux chocs, tout en maintenant la structure de renfort à la périphérie supérieure des poches qui se forment ainsi, c'est-à-dire sur la surface de travail.The invention aims to solve the problems mentioned above and, in particular, to further improve the performance of the impactors by taking advantage of the intrinsic advantages of the technology for manufacturing the impactors described in document WO99 / 47264. Main characteristic elements of the invention The invention proposes an impactor intended for vertical axis centrifugal crushers which, unlike those of the aforementioned prior art, does not deliberately comprise initially, it is that is to say during the first commissioning, no cavities or pockets, but which is provided on its working face with a reinforcing structure consisting of a composite material obtained from an iron-based alloy and ceramic grains very resistant to wear and formed in situ when the impactor is poured by infiltration of the liquid metal used to form the body of the part in a mass of ceramic grains and binder. Said reinforcing structure is provided on the working face in an adequate geometrical arrangement in order to let the metal outcrop locally (that is to say in the zones without reinforcing structure) up to the working surface, so that wear in service automatically causes the formation of pockets or cavities which, when filled with crushed material, exert a shock protection function, while maintaining the reinforcing structure at the upper periphery of the pockets which are thus formed , that is, on the work surface.
[0027] L' impacteur obtenu permet de résoudre entièrement les problèmes précités.The impactor obtained makes it possible to entirely solve the aforementioned problems.
[0028] Pour ce qui concerne les difficultés d'infiltration, la quantité de métal disponible pour infiltrer le support est, dans le cas de l'invention, la totalité du métal constituant la pièce au lieu d'être seulement le métal constituant une simple paroi. De plus, on peut introduire un renfort plus épais là où on le juge nécessaire car on se trouve dans de meilleures conditions d'infiltration du fait que l'on dispose d'une masse plus importante de métal liquide.Regarding the infiltration difficulties, the amount of metal available for infiltrating the support is, in the case of the invention, all of the metal constituting the part instead of being only the metal constituting a single wall. In addition, we can introduce a thicker reinforcement where it is deemed necessary because we are in better infiltration conditions because we have a larger mass of liquid metal.
[0029] Le fait que les poches ne soient pas formées dès le départ élimine complètement le risque résultant de l'existence de parois minces lors de la première mise en service, du fait que des parois suffisamment épaisses peuvent être réalisées.The fact that the pockets are not formed from the start completely eliminates the risk resulting from the existence of thin walls during the first commissioning, due to the fact that sufficiently thick walls can be produced.
[0030] Dans la version proposée par l'invention, seul le profil du renfort doit être modifié si l'on souhaite changer la forme des poches , ce • qui diminue fortement les coûts et offre par ailleurs de meilleures possibilités de forme et de conception. De plus, il est possible de couler la pièce sans recours à un ou des noyaux de sable destinés à former la ou les poches, ce qui : réduit considérablement les frais de production.In the version proposed by the invention, only the profile of the reinforcement must be modified if one wishes to change the shape of the pockets, which • greatly reduces costs and also offers better possibilities of shape and design . In addition, it is possible to cast the part without recourse to one or more sand cores intended to form the pocket or pockets, which: considerably reduces the production costs.
[0031] Finalement, la technique de l'invention permet d'améliorer sensiblement la durée de vie car dès que la formation des poches est amorcée, on bénéficie déjà de 1 ' autoprotection due à la matière retenue dans ces poches en formation. La progression de la formation des poches s'en trouve ralentie et lorsqu'on arrive à la formation complète de celles-ci, on a gagné en durée de vie tout le temps nécessaire à cette formation. [0032] En résumé, on peut donc dire que l'invention intègre les avantages spécifiques décrits dans le documentFinally, the technique of the invention makes it possible to significantly improve the service life because as soon as the formation of the pockets is initiated, one already benefits from one self-protection due to the material retained in these pockets in formation. The progression of the formation of pockets is slowed down and when we arrive at the complete formation of these, we have gained in lifespan all the time necessary for this training. In summary, we can say that the invention incorporates the specific advantages described in the document
W099/47264 d'une structure de renfort, constituée d'un matériau composite, obtenue in situ par l'infiltration d'un métal liquide dans une masse céramique avec les facilités et avantages de la production d'une pièce, sans l'obligation de prévoir une ou des poches.W099 / 47264 of a reinforcing structure, made of a composite material, obtained in situ by the infiltration of a liquid metal into a ceramic mass with the facilities and advantages of the production of a part, without the obligation to provide one or more pockets.
[0033] Le procédé utilisé est particulièrement simple à mettre en œuvre puisqu'il suffit de fixer dans le fond d'un moule, par des moyens conventionnels tels que collage, fixation mécanique, clous, vis, tiges d'ancrage ou autres selon la disposition géométrique voulue pour permettre ultérieurement la formation d'une ou plusieurs poches par usure , une garniture de matière céramique technique résistante à l'usure, de préférence sous forme d'une masse de grains céramiques à base d'alumine et de zircone et d'un liant, et de couler ensuite la masse métallique servant à constituer le corps de lλ impacteur. Ce métal en infiltrant la masse céramique assure sa parfaite solidarisation avec la pièce coulée lors du refroidissement de la pièce. Il suffit ensuite de démouler la pièce et, après une éventuelle finition (ébarbage etc.), l' impacteur peut être directement mis en service.The method used is particularly simple to implement since it suffices to fix in the bottom of a mold, by conventional means such as gluing, mechanical fixing, nails, screws, anchor rods or others depending on the geometrical arrangement desired to subsequently allow the formation of one or more pockets by wear, a lining of wear-resistant technical ceramic material, preferably in the form of a mass of ceramic grains based on alumina and zirconia and d a binder, and then casting the metallic mass used to form the body of λ impactor. This metal, by infiltrating the ceramic mass, ensures its perfect connection with the cast part during the cooling of the part. Then it is enough to unmold the part and, after a possible finishing (deburring etc.), the impactor can be directly put into service.
[0034] D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui suit, en référence aux dessins annexés.Other features and advantages of the invention will appear on reading the description which follows, with reference to the accompanying drawings.
Brève description des dessinsBrief description of the drawings
[0035] Dans les différents dessins annexés, on a représenté : - Figure 1 : une vue en perspective d'un impacteur à poches selon l'état de la technique, avec renfort en céramique infiltrée par du métal ;In the various accompanying drawings, there is shown: - Figure 1: a perspective view of a pocket impactor according to the prior art, with ceramic reinforcement infiltrated by metal;
Figure 2 : une vue en perspective d'un impacteur avec le même type de renfort et sans poches, suivant la présente invention ;Figure 2: a perspective view of an impactor with the same type of reinforcement and without pockets, according to the present invention;
Figure 3 : une vue en coupe longitudinale d'un impacteur suivant la figure 2 avec le tracé évolutif du profil des poches lors de leur formation. Description d'une forme d'exécution préférée de l'invention [0036] Des repères de référence identiques sont utilisés dans les différentes figures pour des éléments constitutifs identiques ou similaires.Figure 3: a longitudinal sectional view of an impactor according to Figure 2 with the evolutionary outline of the profile of the pockets during their formation. Description of a preferred embodiment of the invention Identical reference marks are used in the different figures for identical or similar constituent elements.
[0037] Un impacteur à poches classique 1 selon la figure 1.comporte une ou plusieurs poches, en l'occurrence les deux poches 2 et 2 ' réalisées de fonderie, avant mise en service de 1 ' impacteur 1. Cet impacteur comporte avantageusement des renforts 4 en céramique infiltrée. Le nez 6 de l' impacteur et la face de sortie 7 de l' impacteur, qui sont en principe également fortement sollicités, peuvent comporter des renforts supplémentaires, tel que le renfort 8 représenté à la figure 1. [0038] Dans le cas de la forme d' exécution représentée à la figure 2, l' impacteur 1 est conçu avant la mise en service comme une pièce pleine, sans poches sur sa face de travail 5, mais pourvue de renforts 4 réalisés de fonderie. Ces renforts peuvent être disposés, - comme représenté dans la vue de la figure 2, selon une forme et une disposition similaires à celles prévues dans la figureA conventional pocket impactor 1 according to FIG. 1. Has one or more pockets, in this case the two pockets 2 and 2 'made of foundry, before the impactor 1 is put into service. This impactor advantageously includes reinforcements 4 in infiltrated ceramic. The nose 6 of the impactor and the outlet face 7 of the impactor, which are in principle also highly stressed, may include additional reinforcements, such as the reinforcement 8 shown in FIG. 1. In the case of the embodiment shown in Figure 2, the impactor 1 is designed before commissioning as a solid piece, without pockets on its working face 5, but provided with reinforcements 4 made of foundry. These reinforcements can be arranged, - as shown in the view of Figure 2, in a shape and an arrangement similar to those provided in the figure
1, si l'on souhaite former en service deux poches. Bien entendu, en fonction des buts poursuivis, d'autres formes et dispositions sont possibles. [0039] La figure 3 illustre l'évolution en service1, if one wishes to form two pockets in service. Of course, depending on the aims pursued, other forms and arrangements are possible. Figure 3 illustrates the evolution in service
(progression I, II et III) du profil de la poche en formation, résultant de la présence des renforts 4 avant la mise en service de la pièce.(progression I, II and III) of the profile of the pocket being formed, resulting from the presence of the reinforcements 4 before the part is put into service.
[0040] On a représenté le renfort intermédiaire séparant dans la figure 1, les poches 2 et 2 ' et commun à celles-ci, et le renfort intermédiaire correspondant dans la figure 2 (et dans la figure 3) comme ayant la même épaisseur. Dans le cas de la forme d'exécution de la figure 1, on est cependant limité en épaisseur car il est, dans ce cas, particulièrement difficile d'infiltrer la matière céramique totalement dans sa masse par le métal, alors que cette difficulté n'apparaît pas, dans le cas de la figure 2, à cause du caractère « plein » de la pièce formée par coulée .There is shown the intermediate reinforcement separating in Figure 1, the pockets 2 and 2 'and common to them, and the corresponding intermediate reinforcement in Figure 2 (and in Figure 3) as having the same thickness. In the case of the embodiment of FIG. 1, one is however limited in thickness because it is, in this case, particularly difficult to infiltrate the ceramic material completely in its mass by the metal, whereas this difficulty does not appear, in the case of FIG. 2, because of the "full" character of the part formed by casting .
[0041] L'invention apporte donc une solution simple à différents problèmes techniques de réalisation d' impacteurs, en particulier une plus grande liberté de conception de ceux-ci. L'exécution de la technique préconisée est de plus peu onéreuse. Le coût de la fonte supplémentaire -à utiliser est largement compensé par la durée accrue de fonctionnement, la facilité d'exécution et l'absence de nécessité de prévoir des moyens spécifiques pour créer les poches lors de la coulée de la pièce. [0042] Des renforts supplémentaires pour le nez et la face de sortie de l' impacteur, tel que celui représenté par le repère 8 dans la figure 1, peuvent être également prévus dans la forme d'exécution de l'invention, notamment de la figure 2 et 3. Il n'y sont pas représentés, uniquement pour des raisons de clarté du dessin. The invention therefore provides a simple solution to various technical problems of producing impactors, in particular greater freedom of design thereof. The execution of the recommended technique is moreover inexpensive. The cost of the additional cast iron to be used is largely offset by the increased operating time, the ease of execution and the absence of the need to provide specific means for creating the pockets during the casting of the part. Additional reinforcements for the nose and the exit face of the impactor, such as that represented by the reference 8 in FIG. 1, can also be provided in the embodiment of the invention, in particular of the Figures 2 and 3. They are not shown there, only for the sake of clarity of the drawing.

Claims

REVENDICATIONS
1. Impacteur destiné à des concasseurs centrifuges à axe vertical, caractérisé en ce qu'il ne comporte initialement, c'est-à-dire lors de la première mise en service, pas de cavités ou poches, mais qu'il est pourvu sur sa face de travail (5) d'une structure de renfort (4) constituée d'un matériau composite obtenu à partir d'un alliage à base de fer et de grains de céramique très résistants à l'usure et formée in situ à la coulée de 1' impacteur par infiltration du métal liquide servant à former le corps de la pièce dans une masse de grains céramiques et de liant.1. Impactor intended for centrifugal crushers with vertical axis, characterized in that it does not initially, that is to say during the first commissioning, no cavities or pockets, but that it is provided on its working face (5) of a reinforcing structure (4) made of a composite material obtained from an alloy based on iron and ceramic grains very resistant to wear and formed in situ at the pouring of the impactor by infiltration of the liquid metal used to form the body of the part in a mass of ceramic grains and binder.
2. Impacteur selon la revendication 1, caractérisé en ce que ladite structure de renfort (4) est prévue sur la face de travail (5) selon une disposition géométrique adéquate afin de laisser le métal affleurer localement jusqu'à la surface de travail (5), de manière que l'usure en service provoque automatiquement la formation de poches ou cavités qui, en se remplissant de matière broyée, exercent une fonction de protection aux chocs tout en maintenant la structure de renfort à la périphérie supérieure des poches qui se forment ainsi, c'est-à-dire sur la surface de travail. 2. Impactor according to claim 1, characterized in that said reinforcing structure (4) is provided on the working face (5) according to an adequate geometrical arrangement in order to let the metal flush locally to the working surface (5 ), so that wear in service automatically causes the formation of pockets or cavities which, by filling with crushed material, exert a shock protection function while maintaining the reinforcement structure at the upper periphery of the pockets which form well, that is, on the work surface.
3. Impacteur selon la revendication 2, caractérisé en ce qu'il comporte une structure de renfort (4) dont la forme et la disposition sont telles qu'elle entraîne , lors de l'usure en service, la formation d'au moins une poche . 3. Impactor according to claim 2, characterized in that it comprises a reinforcing structure (4) whose shape and arrangement are such that it causes, during wear in service, the formation of at least one pocket.
4.. Impacteur selon la revendication 3, caractérisé en ce qu'il comporte une structure de renfort (4) dont la forme et la disposition sont telles qu'elle entraîne, lors de l'usure en service, la formation d'au moins deux poches . 4 .. impactor according to claim 3, characterized in that it comprises a reinforcing structure (4) whose shape and arrangement are such that it causes, during wear in service, the formation of at least two pockets.
5. Impacteur selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les grains de céramique sont des grains à base d'alumine et de zircone .5. Impactor according to any one of claims 1 to 4, characterized in that the ceramic grains are grains based on alumina and zirconia.
6. Procédé de production d'un impacteur selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'on fixe dans le fond d'un moule, selon la disposition géométrique voulue pour permettre ultérieurement la formation d'une ou plusieurs poches par usure, une garniture de matière céramique résistante à l'usure, infiltrable par un métal fondu et qu'on coule ensuite la masse métallique servant à constituer le corps de 1' impacteur de manière qu'elle affleure jusqu'à la surface de travail dans les zones non garnies de matière céramique et, qu'après solidarisation de la garniture de matière céramique infiltrée avec la masse métallique par refroidissement, on procède au démoulage de la pièce formant 1 ' impacteur .6. A method of producing an impactor according to any one of claims 1 to 5, characterized in that fixed in the bottom of a mold, according to the desired geometrical arrangement to later allow the formation of one or more wear pockets, a lining of wear-resistant ceramic material, infiltrable with molten metal and then pouring the metallic mass used to form the body of the impactor so that it is flush with the surface of working in areas not lined with ceramic material and, after the ceramic lining lined with the metallic mass has been secured by cooling, the part forming the impactor is removed from the mold.
7. Utilisation des impacteurs selon l'une quelconque des revendications 1 à 5, ou obtenus -par le procédé de la revendication 6, dans des concasseurs centrifuges à axe vertical en formant progressivement des poches par usure en service de sa matière constitutive non protégée par la structure de renfort sur la face de travail . 7. Use of the impactors according to any one of claims 1 to 5, or obtained by the method of claim 6, in centrifugal crushers with vertical axis by progressively forming pockets by wear in service of its constituent material not protected by the reinforcing structure on the working face.
PCT/BE2000/000091 2000-08-02 2000-08-02 Impeller for centrifugal crushers with vertical axis and method for making same WO2002009878A1 (en)

Priority Applications (17)

Application Number Priority Date Filing Date Title
DE60019346T DE60019346T2 (en) 2000-08-02 2000-08-02 HITCH FOR A VERTICAL MUFFLE AND MANUFACTURING PROCESS
HU0301785A HU226990B1 (en) 2000-08-02 2000-08-02 Impeller for centrifugal crushers with vertical axis and method making same
PT00951123T PT1305116E (en) 2000-08-02 2000-08-02 IMPACT ELEMENT INTENDED FOR CENTRIFUGAL BRUSHES OF VERTICAL AXIS AND PRODUCTION PROCESS
ES00951123T ES2235923T3 (en) 2000-08-02 2000-08-02 IMPACTOR INTENDED FOR VERTICAL AXIS CENTRIFUGAL CRUSHERS AND PRODUCTION PROCEDURE.
JP2002515420A JP4084996B2 (en) 2000-08-02 2000-08-02 Slow shoe for centrifugal crusher with vertical axis and method for manufacturing the same
PCT/BE2000/000091 WO2002009878A1 (en) 2000-08-02 2000-08-02 Impeller for centrifugal crushers with vertical axis and method for making same
SK1767-2002A SK286255B6 (en) 2000-08-02 2000-08-02 Impeller for centrifugal crushers with vertical axis and method for making same
CA002412314A CA2412314C (en) 2000-08-02 2000-08-02 Impeller for centrifugal crushers with vertical axis and method for making same
CZ20024016A CZ298653B6 (en) 2000-08-02 2000-08-02 Impeller for centrifugal crushers with vertical axis and method for making the same
KR1020037000067A KR100672270B1 (en) 2000-08-02 2000-08-02 Throw shoe for centrifugal-type crushers with a vertical shaft, method for producing the same and method for using the same
AU6417700A AU6417700A (en) 2000-08-02 2000-08-02 Impeller for centrifugal crushers with vertical axis and method for making same
EP00951123A EP1305116B1 (en) 2000-08-02 2000-08-02 Impeller for centrifugal crushers with vertical axis and method for making same
MXPA03001000A MXPA03001000A (en) 2000-08-02 2000-08-02 Impeller for centrifugal crushers with vertical axis and method for making same.
CNB008197660A CN1246080C (en) 2000-08-02 2000-08-02 Impeller for centrifugal crushers with vertical axis and method for making same
PL00364776A PL195796B1 (en) 2000-08-02 2000-08-02 Impeller for centrifugal crushers with vertical axis and method for making same
AT00951123T ATE292520T1 (en) 2000-08-02 2000-08-02 BEAT BAR FOR A VERTICAL SPIN MILL AND PRODUCTION METHOD
AU2000264177A AU2000264177B2 (en) 2000-08-02 2000-08-02 Impeller for centrifugal crushers with vertical axis and method for making same

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KR (1) KR100672270B1 (en)
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CA (1) CA2412314C (en)
CZ (1) CZ298653B6 (en)
DE (1) DE60019346T2 (en)
ES (1) ES2235923T3 (en)
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CN101884948A (en) * 2010-06-24 2010-11-17 昆明理工大学 Composite lining plate of ball mill and preparation method thereof
US8657220B2 (en) 2008-07-08 2014-02-25 Johannes P. A. J. Van der Zanden Rotor with closed centre space and cover member

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KR100561914B1 (en) 2005-12-28 2006-03-20 허홍순 Wear plate of a rotor and vertical shaft impact crusher having the same
CN117920393B (en) * 2024-03-23 2024-05-28 大庆师范学院 Grinding device for producing dispersed nano material and application method thereof

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US5328776A (en) * 1993-01-04 1994-07-12 Michail Garber Abrasion and impact resistant composite castings and wear resistant surface provided therewith
WO1999047264A1 (en) 1998-03-17 1999-09-23 Magotteaux International S.A. Ejector with one or several pockets

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US4848683A (en) * 1986-12-09 1989-07-18 Ing. Shoji Co., Ltd. Crushing members used in pulverizers
US5328776A (en) * 1993-01-04 1994-07-12 Michail Garber Abrasion and impact resistant composite castings and wear resistant surface provided therewith
WO1999047264A1 (en) 1998-03-17 1999-09-23 Magotteaux International S.A. Ejector with one or several pockets

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8657220B2 (en) 2008-07-08 2014-02-25 Johannes P. A. J. Van der Zanden Rotor with closed centre space and cover member
CN101884948A (en) * 2010-06-24 2010-11-17 昆明理工大学 Composite lining plate of ball mill and preparation method thereof
CN101884948B (en) * 2010-06-24 2013-05-15 昆明理工大学 Composite lining plate of ball mill and preparation method thereof

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CN1246080C (en) 2006-03-22
SK17672002A3 (en) 2003-05-02
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HUP0301785A2 (en) 2003-09-29
HU226990B1 (en) 2010-04-28
JP2004504147A (en) 2004-02-12
KR20030014419A (en) 2003-02-17
ES2235923T3 (en) 2005-07-16
PT1305116E (en) 2005-06-30
EP1305116A1 (en) 2003-05-02
DE60019346T2 (en) 2006-03-09
AU6417700A (en) 2002-02-13
MXPA03001000A (en) 2004-08-02
PL195796B1 (en) 2007-10-31
CZ298653B6 (en) 2007-12-05
CA2412314A1 (en) 2002-02-07
CZ20024016A3 (en) 2003-04-16
AU2000264177B2 (en) 2005-12-15
PL364776A1 (en) 2004-12-13
ATE292520T1 (en) 2005-04-15
DE60019346D1 (en) 2005-05-12
CA2412314C (en) 2007-10-23
SK286255B6 (en) 2008-06-06
EP1305116B1 (en) 2005-04-06
KR100672270B1 (en) 2007-01-24

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