EP1629892A1 - Rotary ball mill with an improved fixing of the liner - Google Patents

Rotary ball mill with an improved fixing of the liner Download PDF

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Publication number
EP1629892A1
EP1629892A1 EP04447193A EP04447193A EP1629892A1 EP 1629892 A1 EP1629892 A1 EP 1629892A1 EP 04447193 A EP04447193 A EP 04447193A EP 04447193 A EP04447193 A EP 04447193A EP 1629892 A1 EP1629892 A1 EP 1629892A1
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EP
European Patent Office
Prior art keywords
plates
mill
ferrule
shielding
horizontal axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP04447193A
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German (de)
French (fr)
Inventor
Albert Schenk
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Magotteaux International SA
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Magotteaux International SA
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Publication date
Application filed by Magotteaux International SA filed Critical Magotteaux International SA
Priority to EP04447193A priority Critical patent/EP1629892A1/en
Priority to EP05740626A priority patent/EP1781412A1/en
Priority to PCT/BE2005/000058 priority patent/WO2006021057A1/en
Publication of EP1629892A1 publication Critical patent/EP1629892A1/en
Withdrawn legal-status Critical Current

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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
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/22—Lining for containers

Definitions

  • the present invention relates to a horizontal axis mill and more particularly to a cylindrical mill for grinding ores.
  • This mill comprises a ferrule rotating about a horizontal axis, the inside of this ferrule is furnished by a wear shield provided with a particular fastening system.
  • the grinding charge is constituted by grinding bodies of generally spherical or cylindrical shape.
  • a cylindrical ball mill is generally composed of two compartments partially filled with grinding charges defined according to the particle size of the material to be milled for the first compartment and the milled material for the second compartment.
  • the first compartment grinds raw material and the second grinds the already partly ground material.
  • the two compartments are differentiated not only by the size of the grinding media but also by the shapes of the wear shields used. These are composed of special cast steel plates designed to protect the shell from wear and impact.
  • the two compartments are separated by partitions lined with lights and a central opening to allow the passage of the material and the ventilation air.
  • these partitions prevent the passage of grinding bodies from one compartment to another.
  • the shields must transmit the driving power of the mill to the grinding loads: they drive the grinding bodies in the direction of rotation of the mill and prevent them from sliding on the inner wall of the ferrule during the rotation of the mill.
  • the grinding loads thus raised by the shields are divided into different concentric layers subjected to a relative sliding as the effect of lifting decreases as a function of the distance of the layers relative to the shielding. Once the highest lift point is reached, as the grinding chamber is only partially filled, the different layers roll over each other and fall back to the lowest point of the load and then be dragged back to the the top by the armor.
  • the shields In the first compartment, the shields have a specific profile intended to give them a significant lifting effect so as to cause the shearing and compression of the particles of material that interfered between the different layers of grinding bodies.
  • the grinding phenomenon applies to a material already greatly reduced in size and therefore the size of the grinding bodies decreases according to the grain size of the ground material.
  • This effect is obtained by means of classifying shields consisting of plates of a shape such that the internal lining of the crusher consists of a series of rings of conical section flared towards the arrival of the material and whose taper causes a classification. regular and permanent crushing machinery.
  • Such shields are extensively described in US Patent 3,630,459 and French Patent 7,006,848.
  • the attachment of the armor plates, first or second chamber, to the ferrule of the mill is conventionally carried out by bolts passing through the plates and the shell of the mill and whose heads are embedded in a housing plates to avoid exposing them to the wear and shock.
  • the nuts are placed outside the shell which allows the bolts to be tightened from the outside of the mill.
  • the rings of the grinders are thus pierced with a number of holes for the passage of bolts. Both the configuration of the holes and their diameter change according to the manufacturer of the mill. At present, only DIN has prevailed in Western Europe and is characterized by a longitudinal distance of 250 mm holes and a circumferential distance of 314.16 mm arc. The diameter of the holes varies from 30 to 42 mm according to the manufacturers and the size of the grinders.
  • the manufacturer of cast armor which wishes to equip a mill must therefore design the dimensions and the fixings of the plates according to these different standards and also according to the diameters of the mills because the armor plates resting on the inner cylindrical surface of the ferrule must conform to the inner cylindrical surface thereof.
  • the present invention aims to provide a grinder with a fastening system shielding plates without bolts passing through the ferrule and therefore completely independent of the holes thereof.
  • the present invention presents a horizontal axis mill comprising a ferrule and a shielding system for protecting the internal face of the shell of said mill and a holding system for mounting said shield, characterized in that said shielding system is free of fastening means passing through the wall of said ferrule thus enabling said shielding system to be independent of the pre-existing fastening means on said ferrule.
  • said shielding system comprises shielding plates and a holding system for mounting, comprising means for fixing said shield, the shield comprising high shielding plates and low shielding plates, said high shielding being capable of being fixed on said holding system for mounting to maintain said low shield against said ferrule.
  • said holding system for mounting is a hoop provided with an opening means for increasing its peripheral diameter to adjust it to the inner diameter of said ferrule.
  • a key aspect of the present invention is that the attachment of said holding system on said ferrule is independent of the pre-existing attachment holes on said ferrule.
  • said shielding system once the assembly is completed by vault effect.
  • the mill comprises so-called universal shielding plates, the shape of which is independent of the diameter of the mill.
  • said universal armor plates have a length / width ratio between 4 and 20.
  • said universal armor plates have a length / width ratio between 10 and 15.
  • said universal armor plates have a length of between 500 and 1200 mm and a width of between 30 and 120 mm.
  • Figure 1 is a vertical section along the longitudinal axis of a mill with two grinding compartments provided with shieldings according to the prior art.
  • FIG. 2 represents the sectional view of the shielding of the second chamber of the mill of FIG. 1 according to the prior art, with a fixing system requiring a piercing of the ferrule and thus a manufacture of custom armor.
  • Figure 3 shows the mill with an improved shield attachment system, according to the invention without piercing the ferrule with low shields without openings and high shielding with a hole provided for attachment to the hoop.
  • Figure 4 shows a mechanized fastener hoop according to the present invention for increasing the diameter of the hoop.
  • the mechanized hoops 10 are arranged on the ferrule at distances that make it possible to house exactly between them the plates without bolts or low armor 9.
  • an opening system 14 to slightly increase the peripheral diameter of each hoop 10.
  • a pressed on the ferrule, the separations of the hoop rings 10 are welded together in order to be able to remove the opening systems 14 without modifying the diameter of the hoops 10.
  • the lowest part of the ferrule is covered with plates without bolts or low shielding 9 placed contiguously between the rings of the hoop 10 so as to cover a ferrule bow allowing manipulation without risk of falling.
  • the bolted plates 11 are arranged on the rings and are held by bolts 12 whose head engages in the groove of the rings and gets stuck in said groove.
  • the nuts 13 of the bolts are embedded in the cylindrical housings of the high shields 11 so as not to be subsequently subjected to the impacts of the balls 7 of the mill 1.
  • setting thicknesses may be placed. cardboard or plastic on the ends of the wedged plates which will be covered by the bolted plates 11 so that the bolted plates 11 slightly press the fixed plates 9 and prevent them from moving after tightening the bolts 12.
  • the bolted plates 11 will thus remain safe and will also maintain the plates without bolts 9 during the execution of the assembly, to turn and locate the mill appropriately until the surface of the shell is completely filled with plates without bolts 9. As soon as surface of the shell between two rings is almost completely covered with plates without bolts 9, the latter are separated by a hydraulic system and the last plates 9 are forced into the opening between the other plates 9 so that all each ring of plates 9 is maintained by vault effect.
  • the bolts 12 that attach the plates 9 and 11 on the hoops are temporary attachment means to allow mounting safely: they do not constitute the final fixation of the shielding that takes place by vault effect.
  • the installation can progress from ring ring to complete coverage of the ferrule by starting the assembly simultaneously upstream and downstream to finish the visit openings of the mill.
  • the bolted plates 11 may have different profiles to give them or not, in combination with the non-bolted plates 9, properties of classifying shielding described in the US and French patents mentioned above.

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

Abstract

The mill has a lining system to protect inner side of a shell, and a cradle (10) for assembling the lining system. The lining system is free from fixing unit traversing wall of the shell. The lining system has lower and upper lining plates (9, 11), where the plate (11) is fixed on the cradle in order to hold the plate (9) against the shell. The cradle has an opening to increase peripheral diameter of the cradle.

Description

Objet de l'inventionObject of the invention

La présente invention concerne un broyeur à axe horizontal et plus particulièrement un broyeur cylindrique pour le broyage de minerais. Ce broyeur comporte une virole tournant autour d'un axe horizontal, l'intérieur de cette virole est garni par un blindage d'usure muni d'un système particulier de fixation. Dans un tel broyeur, la charge broyante est constituée par des corps broyants de forme généralement sphérique ou cylindrique.The present invention relates to a horizontal axis mill and more particularly to a cylindrical mill for grinding ores. This mill comprises a ferrule rotating about a horizontal axis, the inside of this ferrule is furnished by a wear shield provided with a particular fastening system. In such a mill, the grinding charge is constituted by grinding bodies of generally spherical or cylindrical shape.

Etat de la techniqueState of the art

Un broyeur cylindrique à boulets est généralement composé de deux compartiments remplis partiellement de charges broyantes définies en fonction de la granulométrie de la matière à broyer pour le premier compartiment et de la matière broyée pour le second compartiment. Le premier compartiment broie de la matière brute et le second broie de la matière déjà en partie broyée. Compte tenu de cette différence de granulométrie de la matière broyée, les deux compartiments se différencient non seulement par la taille des corps broyants mais aussi par les formes des blindages d'usure utilisés. Ceux-ci sont composés de plaques en aciers spéciaux coulés destinées à protéger la virole de l'usure et des chocs.A cylindrical ball mill is generally composed of two compartments partially filled with grinding charges defined according to the particle size of the material to be milled for the first compartment and the milled material for the second compartment. The first compartment grinds raw material and the second grinds the already partly ground material. Given this difference in grain size of the ground material, the two compartments are differentiated not only by the size of the grinding media but also by the shapes of the wear shields used. These are composed of special cast steel plates designed to protect the shell from wear and impact.

Les deux compartiments sont séparés par des cloisons garnies de lumières et d'un orifice central afin de permettre le passage de la matière et de l'air de ventilation. De plus ces cloisons empêchent le passage des corps broyants d'un compartiment à l'autre.The two compartments are separated by partitions lined with lights and a central opening to allow the passage of the material and the ventilation air. In addition these partitions prevent the passage of grinding bodies from one compartment to another.

Les blindages doivent transmettre la puissance d'entraînement du broyeur aux charges broyantes : ils entraînent les corps broyants dans le sens de rotation du broyeur et les empêchent de glisser sur la paroi interne de la virole pendant la rotation du broyeur. Les charges broyantes ainsi relevées par les blindages se divisent en différentes couches concentriques soumises à un glissement relatif car l'effet du relevage s'atténue en fonction de la distance des couches par rapport au blindage. Une fois atteint le point de relevage le plus élevé, comme le compartiment de broyage n'est que partiellement rempli, les différentes couches dévalent les unes sur les autres et retombent vers le point le plus bas de la charge pour ensuite être à nouveau entraînées vers le haut par le blindage.The shields must transmit the driving power of the mill to the grinding loads: they drive the grinding bodies in the direction of rotation of the mill and prevent them from sliding on the inner wall of the ferrule during the rotation of the mill. The grinding loads thus raised by the shields are divided into different concentric layers subjected to a relative sliding as the effect of lifting decreases as a function of the distance of the layers relative to the shielding. Once the highest lift point is reached, as the grinding chamber is only partially filled, the different layers roll over each other and fall back to the lowest point of the load and then be dragged back to the the top by the armor.

Dans le premier compartiment, les blindages présentent un profil spécifique destiné à leur donner un effet de relevage important de façon à provoquer le cisaillement et la compression des particules de matière qui s'immiscent entre les différentes couches de corps broyants.In the first compartment, the shields have a specific profile intended to give them a significant lifting effect so as to cause the shearing and compression of the particles of material that interfered between the different layers of grinding bodies.

Dans le deuxième compartiment du broyeur, le phénomène de broyage s'applique à une matière déjà fortement réduite en taille et de ce fait la taille des corps broyants diminue en fonction de la granulométrie de la matière broyée. Pour améliorer le rendement de broyage du deuxième compartiment, il est apparu intéressant de maintenir un classement des corps broyants par taille tout au long de la deuxième chambre de façon à conserver la relation entre la taille des corps et l'augmentation de la finesse de la matière broyée. Cet effet est obtenu grâce à des blindages classants constitués de plaques d'une forme telle que le revêtement interne du broyeur se compose d'une série d'anneaux de section conique évasée vers l'arrivée de la matière et dont la conicité provoque un classement régulier et permanent des engins broyants. De tels blindages sont abondamment décrits dans le brevet américain 3 630 459 et le brevet français 7 006 848.In the second compartment of the mill, the grinding phenomenon applies to a material already greatly reduced in size and therefore the size of the grinding bodies decreases according to the grain size of the ground material. To improve the grinding efficiency of the second compartment, it appeared interesting to maintain a classification of grinding bodies by size throughout the second chamber so as to maintain the relation between the size of the bodies and the increase of the fineness of the crushed material. This effect is obtained by means of classifying shields consisting of plates of a shape such that the internal lining of the crusher consists of a series of rings of conical section flared towards the arrival of the material and whose taper causes a classification. regular and permanent crushing machinery. Such shields are extensively described in US Patent 3,630,459 and French Patent 7,006,848.

La fixation des plaques de blindages, de première ou deuxième chambre, à la virole du broyeur est réalisée classiquement par des boulons traversant les plaques et la virole du broyeur et dont les têtes sont noyées dans un logement des plaques pour éviter de les exposer à l'usure et aux chocs. Les écrous sont placés à l'extérieur de la virole ce qui permet le serrage des boulons par l'extérieur du broyeur.The attachment of the armor plates, first or second chamber, to the ferrule of the mill is conventionally carried out by bolts passing through the plates and the shell of the mill and whose heads are embedded in a housing plates to avoid exposing them to the wear and shock. The nuts are placed outside the shell which allows the bolts to be tightened from the outside of the mill.

Les viroles des broyeurs sont ainsi percées d'un certain nombre de trous permettant le passage des boulons. Tant la configuration des perçages que leur diamètre changent selon le fabricant du broyeur. A l'heure actuelle, seule la norme DIN s'est imposée en Europe de l'ouest et est caractérisée par une distance longitudinale des trous de 250 mm et une distance circonférentielle de 314,16 mm d'arc. Le diamètre des trous varie de 30 à 42 mm selon les constructeurs et la taille des broyeurs.The rings of the grinders are thus pierced with a number of holes for the passage of bolts. Both the configuration of the holes and their diameter change according to the manufacturer of the mill. At present, only DIN has prevailed in Western Europe and is characterized by a longitudinal distance of 250 mm holes and a circumferential distance of 314.16 mm arc. The diameter of the holes varies from 30 to 42 mm according to the manufacturers and the size of the grinders.

Les broyeurs d'une origine non-européenne ne se conforment pas à la norme DIN et présentent une grande diversité de perçage, chaque constructeur suivant ses propres normes.Grinders of a non-European origin do not comply with the DIN standard and have a wide variety of drilling, each manufacturer following his own standards.

Le fabricant de blindages coulés qui désire équiper un broyeur doit donc concevoir les dimensions et les fixations des plaques en fonction de ces différentes normes et en fonction également des diamètres des broyeurs car les plaques de blindage reposant sur la surface cylindrique intérieure de la virole doivent épouser la surface cylindrique intérieure de celles-ci.The manufacturer of cast armor which wishes to equip a mill must therefore design the dimensions and the fixings of the plates according to these different standards and also according to the diameters of the mills because the armor plates resting on the inner cylindrical surface of the ferrule must conform to the inner cylindrical surface thereof.

Toutes ces difficultés peuvent être résolues techniquement en fabriquant des plaques de blindage sur mesure pour chaque type de broyeur mais cette solution est très coûteuse et entraîne la création de nombreux modèles de fonderies.All of these difficulties can be solved technically by making custom shielding plates for each type of mill but this solution is very expensive and leads to the creation of many models of foundries.

Pour diminuer la quantité de modèles de plaques nécessaires à la fabrication des blindages et particulièrement des blindages qui ne sont pas standardisés selon la norme DIN, on a imaginé différentes solutions dont le but étaient d'éliminer la dépendance entre les modèles de blindages et les trous de fixation de la virole.To reduce the number of plate models required for the manufacture of shields and particularly shields that are not standardized according to the DIN standard, different solutions have been devised whose aim was to eliminate the dependence between shielding models and holes. fixing the ferrule.

Une solution consistait à fixer les plaques sans les boulonner et en constituant des anneaux de plaques sans boulons : on installait d'abord des voûtes de plaques sur la demi-circonférence du broyeur que l'on étançonnait provisoirement avec des vérins de calage jusqu'à ce que l'autre moitié de la circonférence soit également recouverte d'une voûte de plaques. Une fois les deux demies circonférences recouvertes de plaques, elles se maintenaient sans aucune aide, les deux voûtes s'appuyant l'une sur l'autre et formant une circonférence complète.One solution was to fix the plates without bolting them and to form rings of plates without bolts: first, vaults of plates were installed on the half-circumference of the crusher which was temporarily propped up with jacks up to that the other half of the circumference is also covered with a vault of plates. Once the two half circles covered with plates, they remained unaided, the two arches resting on one another and forming a complete circumference.

Cette solution telle que décrite présentait des risques lors du montage car il fallait après avoir installé une voûte sur une demie circonférence, faire tourner le broyeur d'un demi tour pour installer les plaques sur la demie circonférence restante et travailler sous la voûte maintenue par les étançons. Les accidents dus à la chute de voûtes ont éliminé ce type de montage au profit de montages remplaçant les vérins par des files longitudinales de plaques de blindage boulonnées à la virole et servant d'appui aux voûtes. Malheureusement cette technique de montage rendait à nouveau le blindage et les modèles de fonderie tributaires des perçages de virole.This solution as described presented risks during assembly because it was necessary after having installed a vault on a half circumference, turn the mill a half turn to install the plates on the remaining half circumference and work under the arch maintained by the stanchions. Accidents due to falling arches have eliminated this type of assembly in favor of assemblies replacing the cylinders by longitudinal queues of armor plates bolted to the shell and serving as support for the vaults. Unfortunately this Mounting technique again made shielding and foundry models dependent on ferrule bores.

D'autres solutions existent également et consistent dans la réalisation de blindages composés partiellement de plaques calées maintenues par des plaques boulonnées avec comme caractéristique essentielle que les boulons de fixations traversent la virole du broyeur. Ce type de solution est notamment présenté dans les documents US-1921672, US-1534000 ou US-2949247.Other solutions also exist and consist in the production of shields composed partially of wedged plates held by bolted plates with the essential characteristic that the bolts of fasteners pass through the shell of the mill. This type of solution is in particular presented in US-1921672, US-1534000 or US-2949247.

Buts de l'inventionGoals of the invention

La présente invention vise à fournir un broyeur avec un système de fixation des plaques de blindage exempt de boulons traversant la virole et donc totalement indépendant des perçages de celle-ci.The present invention aims to provide a grinder with a fastening system shielding plates without bolts passing through the ferrule and therefore completely independent of the holes thereof.

Résumé de l'inventionSummary of the invention

La présente invention présente un broyeur à axe horizontal comportant une virole et un système de blindage destiné à protéger la face interne de la virole dudit broyeur ainsi qu'un système de maintien pour le montage dudit blindage, caractérisé en ce que ledit système de blindage est exempt de moyens de fixation traversant la paroi de ladite virole permettant ainsi audit système de blindage d'être indépendant des moyens de fixation préexistants sur ladite virole.The present invention presents a horizontal axis mill comprising a ferrule and a shielding system for protecting the internal face of the shell of said mill and a holding system for mounting said shield, characterized in that said shielding system is free of fastening means passing through the wall of said ferrule thus enabling said shielding system to be independent of the pre-existing fastening means on said ferrule.

Avantageusement, ledit système de blindage comprend des plaques de blindage et un système de maintien pour le montage, comportant un moyen de fixation dudit blindage, le blindage comprenant des plaques de blindage haut et des plaques de blindage bas, ledit blindage haut étant apte a être fixé sur ledit système de maintien pour le montage afin de maintenir ledit blindage bas contre ladite virole.Advantageously, said shielding system comprises shielding plates and a holding system for mounting, comprising means for fixing said shield, the shield comprising high shielding plates and low shielding plates, said high shielding being capable of being fixed on said holding system for mounting to maintain said low shield against said ferrule.

Selon une forme préférée de l'invention, ledit système de maintien pour le montage est un cerceau muni d'un moyen d'ouverture destiné à augmenter son diamètre périphérique pour l'ajuster au diamètre interne de ladite virole.According to a preferred form of the invention, said holding system for mounting is a hoop provided with an opening means for increasing its peripheral diameter to adjust it to the inner diameter of said ferrule.

Un aspect clé de la présente invention est que la fixation dudit système de maintien sur ladite virole est indépendante des orifices de fixation préexistants sur ladite virole.A key aspect of the present invention is that the attachment of said holding system on said ferrule is independent of the pre-existing attachment holes on said ferrule.

De manière particulièrement avantageuse, ledit système de blindage, une fois le montage achevé tient par effet de voûte.Particularly advantageously, said shielding system, once the assembly is completed by vault effect.

Avantageusement, le broyeur comporte des plaques de blindage dites universelles, dont la forme est indépendante du diamètre du broyeur.Advantageously, the mill comprises so-called universal shielding plates, the shape of which is independent of the diameter of the mill.

De préférence, lesdites plaques de blindage universelles ont un rapport longueur/largeur entre 4 et 20.Preferably, said universal armor plates have a length / width ratio between 4 and 20.

De manière particulièrement préférée, lesdites plaques de blindage universelles ont un rapport longueur/largeur entre 10 et 15.In a particularly preferred manner, said universal armor plates have a length / width ratio between 10 and 15.

Conformément à la présente invention, lesdites plaques de blindage universelles ont une longueur comprise entre 500 et 1200 mm et une largeur comprise entre 30 et 120 mm.According to the present invention, said universal armor plates have a length of between 500 and 1200 mm and a width of between 30 and 120 mm.

Brève description des figuresBrief description of the figures

La figure 1 est une coupe verticale selon l'axe longitudinal d'un broyeur avec deux compartiments de broyage muni de blindages selon l'art antérieur.Figure 1 is a vertical section along the longitudinal axis of a mill with two grinding compartments provided with shieldings according to the prior art.

La figure 2 représente la vue en coupe du blindage de la deuxième chambre du broyeur de la figure 1 selon l'art antérieur avec système de fixation nécessitant un perçage de la virole et donc une fabrication des blindages sur mesure.FIG. 2 represents the sectional view of the shielding of the second chamber of the mill of FIG. 1 according to the prior art, with a fixing system requiring a piercing of the ferrule and thus a manufacture of custom armor.

La figure 3 représente le broyeur avec un système de fixation du blindage amélioré, selon l'invention sans perçage de la virole avec des blindages bas sans ouvertures et des blindages hauts avec un trou prévu pour la fixation sur le cerceau.Figure 3 shows the mill with an improved shield attachment system, according to the invention without piercing the ferrule with low shields without openings and high shielding with a hole provided for attachment to the hoop.

La figure 4 représente un cerceau de fixation mécanisé selon la présente invention permettant d'augmenter le diamètre du cerceau.Figure 4 shows a mechanized fastener hoop according to the present invention for increasing the diameter of the hoop.

Description détaillée de l'inventionDetailed description of the invention

Un exemple de réalisation du broyeur muni du système de fixation selon l'invention est représenté dans la figure 3. Il est composé principalement :

  • d'une virole subdivisée en plusieurs compartiments tapissée de plaques de blindage d'usure ;
  • de plaques de blindage sans boulons, appelées plaques basses ou blindages bas 9;
  • de cerceaux mécanisés 10, cintrés à un diamètre périphérique égal au diamètre intérieur de la virole du broyeur 1 et comportant une séparation et un système d'ouverture de ladite séparation 14 permettant de modifier légèrement leur diamètre périphérique. Ils comportent en outre une rainure sur toute leur longueur permettant d'y insérer des boulons dits boulons têtes à marteaux 12 ;
  • de plaques de blindages, boulonnées sur les cerceaux 10, dont la largeur est supérieure à la largeur d'un cerceau mécanisé et comportant en leur centre un trou de boulon, appelées plaques hautes ou blindages hauts 11.
An embodiment of the mill equipped with the fastening system according to the invention is shown in FIG. 3. It is composed mainly of:
  • a shell divided into several compartments lined with wear shielding plates;
  • shield plates without bolts, called low plates or low shields 9;
  • mechanized hoops 10, bent to a peripheral diameter equal to the inner diameter of the shell of the mill 1 and having a separation and an opening system of said separation 14 to slightly modify their peripheral diameter. They further comprise a groove along their entire length for inserting said bolts hammer head bolts 12;
  • armor plates, bolted on the hoops 10, whose width is greater than the width of a mechanized hoop and having in their center a bolt hole, called high plates or high shields 11.

Les cerceaux mécanisés 10 sont disposés sur la virole à des distances permettant de loger exactement entre eux les plaques sans boulons ou blindages bas 9. Pour presser fortement les cerceaux sur la virole, on installe à l'endroit de chaque séparation, un système d'ouverture 14 permettant d'augmenter légèrement le diamètre périphérique de chaque cerceau 10. Une fois pressé sur la virole, les séparations des anneaux du cerceau 10 sont soudées entre elles afin de pouvoir retirer les systèmes d'ouverture 14 sans modifier le diamètre des cerceaux 10. Un tel système est représenté figure 4.The mechanized hoops 10 are arranged on the ferrule at distances that make it possible to house exactly between them the plates without bolts or low armor 9. To strongly press the hoops on the shell, is installed at the location of each separation, an opening system 14 to slightly increase the peripheral diameter of each hoop 10. A pressed on the ferrule, the separations of the hoop rings 10 are welded together in order to be able to remove the opening systems 14 without modifying the diameter of the hoops 10. Such a system is shown in FIG.

Une fois les anneaux installés, la partie la plus basse de la virole est recouverte de plaques sans boulons ou blindages bas 9 placées jointivement entre les anneaux du cerceau 10 de façon à couvrir un arc de virole permettant des manipulations sans risque de chute.Once the rings are installed, the lowest part of the ferrule is covered with plates without bolts or low shielding 9 placed contiguously between the rings of the hoop 10 so as to cover a ferrule bow allowing manipulation without risk of falling.

Ensuite les plaques boulonnées 11 sont disposées sur les anneaux et sont maintenues par des boulons 12 dont la tête s'engage dans la rainure des anneaux et se coince dans ladite rainure. Les écrous 13 des boulons sont noyés dans les logements cylindriques des blindages hauts 11 de façon à ne pas être soumis ultérieurement aux impacts des boulets 7 du broyeur 1. Avant de placer les plaques boulonnées 11 sur les anneaux, on placera éventuellement des épaisseurs de réglage en carton ou en matière plastique sur les extrémités des plaques calées qui seront recouvertes par les plaques boulonnées 11 de façon à ce que les plaques boulonnées 11 pressent légèrement les plaques calées 9 et les empêchent de bouger après serrage des boulons 12.Then the bolted plates 11 are arranged on the rings and are held by bolts 12 whose head engages in the groove of the rings and gets stuck in said groove. The nuts 13 of the bolts are embedded in the cylindrical housings of the high shields 11 so as not to be subsequently subjected to the impacts of the balls 7 of the mill 1. Before placing the bolted plates 11 on the rings, setting thicknesses may be placed. cardboard or plastic on the ends of the wedged plates which will be covered by the bolted plates 11 so that the bolted plates 11 slightly press the fixed plates 9 and prevent them from moving after tightening the bolts 12.

Les plaques boulonnées 11 se maintiendront ainsi en toute sécurité et maintiendront également les plaques sans boulons 9 pendant l'exécution du montage, permettant de virer et de localiser le broyeur de manière adéquate jusqu'à ce que la surface de la virole soit totalement garnie de plaques sans boulons 9. Dès que la surface de la virole comprise entre deux anneaux est quasi complètement recouverte de plaques sans boulons 9, ces dernières sont écartées par un système hydraulique et les dernières plaques 9 sont forcées dans l'ouverture entre les autres plaques 9 de façon à ce que l'ensemble de chaque anneau de plaques 9 se maintienne par effet de voûte.The bolted plates 11 will thus remain safe and will also maintain the plates without bolts 9 during the execution of the assembly, to turn and locate the mill appropriately until the surface of the shell is completely filled with plates without bolts 9. As soon as surface of the shell between two rings is almost completely covered with plates without bolts 9, the latter are separated by a hydraulic system and the last plates 9 are forced into the opening between the other plates 9 so that all each ring of plates 9 is maintained by vault effect.

Il reste alors à compléter l'installation des dernières plaques boulonnées 11 de la même manière que pour les plaques sans boulon 9 : avant d'installer les deux dernières plaques boulonnées 11 de chaque anneau de plaques boulonnées 11, les boulons de fixation 12 sont desserrés et les dernières plaques 11 sont écartées par un vérin hydraulique.It then remains to complete the installation of the last bolted plates 11 in the same way as for the plates without bolt 9: before installing the last two bolted plates 11 of each ring of bolted plates 11, the fixing bolts 12 are loosened and the last plates 11 are separated by a hydraulic cylinder.

Les deux dernières plaques de blindage 11 sont alors forcées dans l'ouverture entre les autres plaques 11 de façon à se maintenir par effet de voûte sans que les boulons 12 soient encore nécessaires.The last two shielding plates 11 are then forced into the opening between the other plates 11 so as to be held by vault effect without the bolts 12 are still necessary.

Les boulons 12 qui attachent les plaques 9 et 11 sur les cerceaux constituent des moyens temporaires de fixation pour permettre un montage en toute sécurité : ils ne constituent pas la fixation définitive du blindage qui a lieu par effet de voûte.The bolts 12 that attach the plates 9 and 11 on the hoops are temporary attachment means to allow mounting safely: they do not constitute the final fixation of the shielding that takes place by vault effect.

L'installation peut progresser d'anneau en anneau jusqu'à la couverture complète de la virole en entamant le montage simultanément par l'amont et l'aval pour le terminer par les ouvertures de visite du broyeur.The installation can progress from ring ring to complete coverage of the ferrule by starting the assembly simultaneously upstream and downstream to finish the visit openings of the mill.

Les plaques boulonnées 11 peuvent présenter différents profils destinés à leur donner ou non, en combinaison avec les plaques non boulonnées 9, les propriétés des blindages classants décrits dans les brevets américains et français mentionnés ci-dessus.The bolted plates 11 may have different profiles to give them or not, in combination with the non-bolted plates 9, properties of classifying shielding described in the US and French patents mentioned above.

LégendeLegend

  • 1. Broyeur à axe horizontal1. Horizontal axis shredder
  • 2. Premier compartiment du broyeur2. First compartment of the crusher
  • 3. Second compartiment du broyeur3. Second crusher compartment
  • 4. Blindage du premier compartiment du broyeur4. Shielding the first compartment of the crusher
  • 5. Blindage du second compartiment du broyeur5. Shielding the second compartment of the crusher
  • 6. Corps broyants du premier compartiment6. Crushing bodies of the first compartment
  • 7. Corps broyants du second compartiment7. Grinding bodies of the second compartment
  • 8. Vis de fixation avec perçage de virole (art antérieur)8. Fastening screw with ferrule piercing (prior art)
  • 9. Blindage bas ou plaques de blindage sans boulons.9. Low shield or armor plates without bolts.
  • 10. Cerceaux mécanisés.10. Mechanized hoops.
  • 11. Blindage haut ou plaques de blindage boulonnées.11. Top shield or bolted armor plates.
  • 12. Boulons têtes à marteaux12. Hammerhead bolts
  • 13. Ecrous13. Nuts
  • 14. Système d'ouverture du cerceau destiné à augmenter le diamètre périphérique.14. Opening system of the hoop to increase the peripheral diameter.

Claims (9)

Broyeur à axe horizontal (1) comportant une virole et un système de blindage destiné à protéger la face interne de la virole dudit broyeur (1) ainsi qu'un système de maintien pour le montage dudit blindage, caractérisé en ce que ledit système de blindage est exempt de moyens de fixation traversant la paroi de ladite virole permettant ainsi audit système de blindage d'être indépendant des moyens de fixation préexistants sur ladite virole.Horizontal axis mill (1) comprising a shell and a shielding system for protecting the internal face of the shell of said mill (1) and a holding system for mounting said shield, characterized in that said shielding system is free of fastening means passing through the wall of said ferrule thus allowing said shielding system to be independent of the pre-existing fastening means on said ferrule. Broyeur à axe horizontal (1) selon la revendication 1 caractérisé en ce que ledit système de blindage comprend des plaques de blindage (9,11) et un système de maintien pour le montage, comportant un moyen de fixation dudit blindage, le blindage comprenant des plaques de blindage haut (11) et des plaques de blindage bas (9), ledit blindage haut (11) étant apte a être fixé sur ledit système de maintien pour le montage afin de maintenir ledit blindage bas (9) contre ladite virole.Horizontal axis mill (1) according to claim 1 characterized in that said shielding system comprises shielding plates (9,11) and a holding system for mounting, comprising means for fixing said shield, the shield comprising high shielding plates (11) and low shielding plates (9), said top shield (11) being adapted to be fixed on said holding system for mounting in order to maintain said bottom shield (9) against said ferrule. Broyeur à axe horizontal (1) selon la revendication 1 caractérisé en ce que ledit système de maintien pour le montage est un cerceau (10) muni d'un moyen d'ouverture (14) destiné à augmenter son diamètre périphérique pour l'ajuster au diamètre interne de ladite virole.Horizontal axis mill (1) according to claim 1 characterized in that said holding system for mounting is a hoop (10) provided with an opening means (14) for increasing its peripheral diameter to adjust it to inner diameter of said ferrule. Broyeur à axe horizontal (1) selon la revendication 1, caractérisé en ce que la fixation dudit système de maintien sur ladite virole est indépendante des orifices de fixation préexistants sur ladite virole.Horizontal axis mill (1) according to claim 1, characterized in that the fixing of said holding system on said ferrule is independent of the pre-existing attachment holes on said ferrule. Broyeur à axe horizontal (1) selon la revendication 1, caractérisé en ce que ledit système de blindage, une fois le montage achevé tient par effet de voûte.Horizontal axis mill (1) according to claim 1, characterized in that said shielding system, once the assembly is completed by vault effect. Broyeur à axe horizontal (1) selon la revendication 1, caractérisé en ce qu'il comporte des plaques de blindage (9,11) dites universelles, dont la forme est indépendante du diamètre du broyeur.Horizontal axis mill (1) according to claim 1, characterized in that it comprises so-called universal shielding plates (9, 11) whose shape is independent of the diameter of the mill. Broyeur à axe horizontal (1) selon la revendication 6, caractérisé en ce que lesdites plaques de blindage universelles ont un rapport longueur/largeur entre 4 et 20.Horizontal axis mill (1) according to claim 6, characterized in that said universal armor plates have a length / width ratio between 4 and 20. Broyeur à axe horizontal (1) selon la revendication 6, caractérisé en ce que lesdites plaques de blindage universelles ont un rapport longueur/largeur entre 10 et 15.Horizontal axis mill (1) according to claim 6, characterized in that said universal armor plates have a length / width ratio between 10 and 15. Broyeur à axe horizontal (1) selon la revendication 6, caractérisé en ce que lesdites plaques de blindage universelles ont une longueur comprise entre 500 et 1200 mm et une largeur comprise entre 30 et 120 mm.Horizontal axis mill (1) according to claim 6, characterized in that said universal armor plates have a length of between 500 and 1200 mm and a width of between 30 and 120 mm.
EP04447193A 2004-08-25 2004-08-25 Rotary ball mill with an improved fixing of the liner Withdrawn EP1629892A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP04447193A EP1629892A1 (en) 2004-08-25 2004-08-25 Rotary ball mill with an improved fixing of the liner
EP05740626A EP1781412A1 (en) 2004-08-25 2005-04-27 Horizontal-axis mill with improved shroud attachment
PCT/BE2005/000058 WO2006021057A1 (en) 2004-08-25 2005-04-27 Horizontal-axis mill with improved shroud attachment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04447193A EP1629892A1 (en) 2004-08-25 2004-08-25 Rotary ball mill with an improved fixing of the liner

Publications (1)

Publication Number Publication Date
EP1629892A1 true EP1629892A1 (en) 2006-03-01

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EP04447193A Withdrawn EP1629892A1 (en) 2004-08-25 2004-08-25 Rotary ball mill with an improved fixing of the liner
EP05740626A Withdrawn EP1781412A1 (en) 2004-08-25 2005-04-27 Horizontal-axis mill with improved shroud attachment

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP05740626A Withdrawn EP1781412A1 (en) 2004-08-25 2005-04-27 Horizontal-axis mill with improved shroud attachment

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EP (2) EP1629892A1 (en)
WO (1) WO2006021057A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1992742A (en) * 1929-05-13 1935-02-26 Dreyer Adolf Ball mill
FR1168412A (en) * 1957-01-14 1958-12-08 Trelleborgs Gummifabriks Ab Wear-resistant lining, e.g. for ball mills and tube rolling mills
US3944091A (en) * 1974-02-09 1976-03-16 Lindemann Maschinenfabrik Gmbh Securing means of replaceable wearing plates in smashing machines
AT390895B (en) * 1986-09-18 1990-07-10 Voest Alpine Ag Ball mill, and grooved hard surfacing for a ball mill
EP1018368A1 (en) * 1998-12-21 2000-07-12 Christian Pfeiffer Maschinenfabrik GmbH Anti-wear lining for tube and/or ball mills

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1178283B (en) * 1961-04-27 1964-09-17 Pfeiffer Fa Christian Armouring for pipe mills and like

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1992742A (en) * 1929-05-13 1935-02-26 Dreyer Adolf Ball mill
FR1168412A (en) * 1957-01-14 1958-12-08 Trelleborgs Gummifabriks Ab Wear-resistant lining, e.g. for ball mills and tube rolling mills
US3944091A (en) * 1974-02-09 1976-03-16 Lindemann Maschinenfabrik Gmbh Securing means of replaceable wearing plates in smashing machines
AT390895B (en) * 1986-09-18 1990-07-10 Voest Alpine Ag Ball mill, and grooved hard surfacing for a ball mill
EP1018368A1 (en) * 1998-12-21 2000-07-12 Christian Pfeiffer Maschinenfabrik GmbH Anti-wear lining for tube and/or ball mills

Also Published As

Publication number Publication date
WO2006021057A1 (en) 2006-03-02
EP1781412A1 (en) 2007-05-09

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