EP0351305A2 - Screening partition for a cylindrical ball mill - Google Patents

Screening partition for a cylindrical ball mill Download PDF

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Publication number
EP0351305A2
EP0351305A2 EP89401985A EP89401985A EP0351305A2 EP 0351305 A2 EP0351305 A2 EP 0351305A2 EP 89401985 A EP89401985 A EP 89401985A EP 89401985 A EP89401985 A EP 89401985A EP 0351305 A2 EP0351305 A2 EP 0351305A2
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EP
European Patent Office
Prior art keywords
bars
partition wall
annular support
wall according
row
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EP89401985A
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German (de)
French (fr)
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EP0351305A3 (en
EP0351305B1 (en
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Benjamin Cambier
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Priority to AT89401985T priority Critical patent/ATE76333T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • 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
    • B02C17/04—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 with unperforated container
    • B02C17/06—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 with unperforated container with several compartments

Definitions

  • the present invention relates to the grinding of materials, for example cement clinker or coal, using grinding bodies of the ball or bar or roller type in a cylindrical grinder rotating around its horizontal axis and comprising one or two or several compartments. It relates more particularly to a partition between two successive compartments or a finishing compartment.
  • ball and ball mill
  • ball will be used for simplification, to designate any grinding body placed freely inside a cylindrical mill to reduce the particle size of the material to be ground, by action of its mass and its surface during the rotation of the mill.
  • They can be spherical balls or cylindrical elements whose height is substantially equal to the diameter or possibly elements having another shape.
  • the mill is partially filled with balls of different sizes, each size corresponding to a main dimension of the balls which is substantially equal, in particular of an average diameter.
  • Grinders of a certain size most often have two or more compartments which each contain balls of different sizes, but whose sizes are adapted according to the particle size of the material to be ground in the compartment considered.
  • Two successive compartments are separated by a selective partition, also called a slit wall.
  • the function given to this partition is to let pass from the upstream compartment to the downstream compartment only the material whose particle size is less than a given dimension; thus the known structure of this partition is conditioned by this role of calibrating the material, as taught in patents FR-A-2 436 629 and FR-A-2 565 850. It consists of a chamber delimited by two integral walls of a axial cone.
  • the first wall is pierced with orifices intended to allow the material having a particle size less than a given dimension to penetrate from the upstream compartment into the chamber.
  • Inside the chamber can be provided means ensuring, during the rotation of the mill, the movement of the material towards the axial cone, along which the material slides towards the downstream compartment.
  • partition wall partition is firstly to maintain in each compartment the balls therein and secondly to ensure the passage of material from the upstream compartment to downstream compartment with the minimum of constraints, without any calibration of the material being sought during said passage.
  • Partition walls having rectilinear and parallel bars have already been produced in particular by patent US.A.1,362,334, each pair of two adjacent bars delimiting a light for passage of the material.
  • the bars being welded together, the partitions of this type are not easily adaptable. Furthermore, they have a small useful passage surface.
  • the partition comprises rectilinear and parallel bars, each pair of adjacent bars delimiting a lumen for passage of the material.
  • the bars are in the form of two parallel rows, the bars of the second row being offset transversely with respect to those of the first row so that a passing light is determined by a pair of two bars, one belonging to the first and the other to the second row, and the ends of the bars are fixed on an annular support fixed on the interior part of the shell of the mill.
  • the bars have circular, elliptical or octagonal sections.
  • the width of the lumen of passage of the material and therefore the spacing between two adjacent bars must be such that it does not allow the passage of the balls from one compartment to the other.
  • This spacing is determined according to the size of the balls placed in the two compartments on either side of the partition and also takes into account the normal wear of the balls during operation of the mill.
  • This particular arrangement also allows, by simple construction and starting from the same bars, to obtain a light for the passage of the material having an adaptable width. To do this, it suffices to adjust the spacing between the two rows of bars differently when they are fixed to the annular support.
  • the height of the annular support is between 15 and 30% of the internal diameter of the ferrule, preferably 26%.
  • the annular support may have a closed structure, that is to say not letting the material pass; it can also have an open structure, for example with radial or concentric slots over all or part of its height, the width of which is equivalent to that of the passage openings between the bars.
  • the partition shown in Figure 1 is arranged inside a cylindrical grinder perpendicular to its longitudinal axis 1 of rotation. It comprises bars 2 rectilinear and parallel to each other, fixed at their two ends to the support 3 by bolts 4.
  • the support 3 is itself fixed, by means not shown, to the shell 5 of the cylindrical crusher.
  • each bar 2 is a solid metal cylinder, 90 mm in diameter, the ends of which are bevelled to follow the annular curvature of the support 2.
  • Figure 2 shows the arrangement of bars 2 along the two rows.
  • the bars 2a of the first row are aligned in the same direction DD 'perpendicular to longitudinal axis 1 of the mill.
  • the bars 2 b of the second row are aligned in the same direction EE ′ parallel to the direction DD ′.
  • Figure 2 also shows the method of fixing a bar 2 on the support 3. The end of the bar 2 is notched on the one hand so as to apply flat on the adjustment plate 6 and on the other leaves so as to receive the head of the bolt 7.
  • the end of the bar 2 and the plate 6 are pierced with a smooth hole; the support 3 is pierced with a threaded orifice; bolt 7 passes through the smooth hole and the tapped hole and keeps blocked by the bolt 7, the bar 2, the plate 6 and the support 3.
  • the spacing between the two rows that is to say between the two directions DD ′ and EE ′ is around 90 to 115 mm.
  • the spacing between two adjacent bars of the same row 2 a or 2 b is 30 mm.
  • the spacing between two adjacent bars, one belonging to the first row 2 a and the other to the second row 2 b, is 25 mm. It is this latter spacing which constitutes the width of the lumen passing the material through the partition. This spacing is a function of the diameter of the balls or dimensions of the smallest grinding bodies. To vary this spacing, it is sufficient to interpose between the support 3 and the bars 2 of the adjustment plates 6 of a different thickness.
  • one or more stiffening elements placed between the two rows of bars are placed, the cross section of which is in the form of a cross and on which the bars of the two rows are supported. sort of maintaining a constant spacing between them despite the forces exerted during the operation of the mill.
  • the annular support 3, shown in Figure 1 has a structure called open lantern, it is constituted by the assembly by welding of elements of smaller dimensions, which are metal plates with large openings 9, thick 60 mm, in the form of arcs, so as to match the inner part of the ferrule 5.
  • the support 3 is lined with wear plates 10 which can be solid or perforated.
  • the thickness of these plates is defined by the alignment of these with bars 2 a and 2 b .
  • the height of these plates delimits an area of the partition through which the material cannot pass.
  • the balls placed on either side of the partition in their respective compartment are spherical balls of diameter 110 and 100 mm on one side and 90, 80, 70 and 60 mm on the other.
  • the circular shape of the section of the bars 2 or possibly elliptical is capable of causing the lowest pressure drop both for the passage of the material and for the flow of the ventilation air in the grinder.
  • Each bar 11 consists of two bar sections 11 a and 11 b fixed at one end 12 on the annular support 13 and the other end 14 of which is housed free in an intermediate support 15.
  • This support 15 consists of two notched shells , which are bolted together after positioning the ends 14 of the sections 11a and 11b in each of the corresponding notches.
  • the bar sections 11a and 11b can move in the notches under the effect of the stresses inherent in grinding without deformation of the partition itself.
  • a circular wear part 16 made of several removable elements covers the part corresponding to the fixing of the bars 11 on the annular support 13.
  • the wear plates 17 which protect the annular support are placed on either side of said support and bolted together by bolts 18 passing through.
  • the support is pierced with openings in which grids are housed 19.
  • the wear plates 17 are pierced with openings which face those of the support and whose dimensions are slightly smaller than those of the support openings, thereby ensuring the maintenance of the grids 19 by simple locking.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

The screening partition is composed of rectilinear and parallel bars (2), of identical and substantially circular, elliptical or octagonal sections, and of an annular support (3) fixed on the inner part of the shell (5) of the mill and on which are fixed the ends of the said bars (2). The bars form two parallel rows, the bars (2b) of the second row being offset transversely relative to those (2a) of the first row. The opening delimited by each pair of two adjacent bars allows the material to pass through but stops the grinding bodies. The annular support (3) comprises wearing plates which are solid or have slots arranged radially or concentrically. <IMAGE>

Description

La présente invention a trait au broyage de matériaux, par exemple du clinker de ciment ou du charbon, à l'aide de corps broyants du type boulets ou barres ou galets dans un broyeur cylindrique tournant autour de son axe horizontal et comportant un ou deux ou plusieurs compartiments. Elle concerne plus particulièrement une cloison de séparation entre deux compartiments successifs ou d'un compartiment finisseur.The present invention relates to the grinding of materials, for example cement clinker or coal, using grinding bodies of the ball or bar or roller type in a cylindrical grinder rotating around its horizontal axis and comprising one or two or several compartments. It relates more particularly to a partition between two successive compartments or a finishing compartment.

Dans la suite de la description , on utilisera à titre de simplification le terme boulet (et broyeur à boulets), pour désigner tout corps broyant placé librement à l'intérieur d'un broyeur cylindrique pour réduire la granulométrie du matériau à broyer, par action de sa masse et de sa surface lors de la rotation du broyeur. Il peut s'agir de boulets sphériques ou d'éléments cylindriques dont la hauteur est sensiblement égale au diamètre ou éventuellement d'éléments ayant une autre forme.In the following description, the term ball (and ball mill) will be used for simplification, to designate any grinding body placed freely inside a cylindrical mill to reduce the particle size of the material to be ground, by action of its mass and its surface during the rotation of the mill. They can be spherical balls or cylindrical elements whose height is substantially equal to the diameter or possibly elements having another shape.

Le broyeur est partiellement rempli de boulets de différents calibres, chaque calibre correspondant à une dimension principale des boulets sensiblement égale, notamment d'un diamètre moyen.The mill is partially filled with balls of different sizes, each size corresponding to a main dimension of the balls which is substantially equal, in particular of an average diameter.

Les broyeurs d'une certaine dimension comportent le plus souvent deux ou plusieurs compartiments qui renferment chacun des boulets de différents calibres, mais dont les calibres sont adaptés en fonction de la granulométrie de la matière à broyer dans le compartiment considéré. Deux compartiments successifs sont séparés par une cloison sélectrice, appelée aussi paroi à fente. Traditionnellement la fonction donnée à cette cloison est de ne laisser passer du compartiment amont au compartiment aval que le matériau dont la granulométrie est inférieure à une dimension donnée ; ainsi la structure connue de cette cloison est conditionnée par ce rôle de calibrage du matériau, comme cela est enseigné dans les brevets FR-A-2 436 629 et FR-A-2 565 850. Elle consiste en une chambre délimitée par deux parois solidaires d'un cône axial. La première paroi est percée d'orifices destinés à laisser pénétrer du compartiment amont jusque dans la chambre le matériau ayant une granulométrie inférieure à une dimension donnée. A l'intérieur de la chambre peuvent être prévus des moyens assurant , lors de la rotation du broyeur , le déplacement du matériau vers le cône axial, le long duquel glisse le matériau vers le compartiment aval.Grinders of a certain size most often have two or more compartments which each contain balls of different sizes, but whose sizes are adapted according to the particle size of the material to be ground in the compartment considered. Two successive compartments are separated by a selective partition, also called a slit wall. Traditionally, the function given to this partition is to let pass from the upstream compartment to the downstream compartment only the material whose particle size is less than a given dimension; thus the known structure of this partition is conditioned by this role of calibrating the material, as taught in patents FR-A-2 436 629 and FR-A-2 565 850. It consists of a chamber delimited by two integral walls of a axial cone. The first wall is pierced with orifices intended to allow the material having a particle size less than a given dimension to penetrate from the upstream compartment into the chamber. Inside the chamber can be provided means ensuring, during the rotation of the mill, the movement of the material towards the axial cone, along which the material slides towards the downstream compartment.

Selon le demandeur et contrairement aux conceptions classiques, le rôle de cloison de séparation des cloisons est d'une part de maintenir dans chaque compartiment les boulets qui s'y trouvent et d'autre part d'assurer le passage du matériau du compartiment amont au compartiment aval avec le minimum de contraintes, sans qu'il soit recherché un calibrage du matériau lors dudit passage.According to the applicant and unlike conventional designs, the role of partition wall partition is firstly to maintain in each compartment the balls therein and secondly to ensure the passage of material from the upstream compartment to downstream compartment with the minimum of constraints, without any calibration of the material being sought during said passage.

C'est l'objet de l'invention que de proposer une cloison de séparation entre deux compartiments dans un broyeur tubulaire à boulets qui réponde à ces objectifs.It is the object of the invention to provide a partition between two compartments in a tubular ball mill which meets these objectives.

On a déjà réalisé notamment par le brevet US.A.1,362,334 des cloisons ayant des barres rectilignes et parallèles, chaque couple de deux barres adjacentes délimitant une lumière de passage du matériau. Cependant les barres étant soudées entre elles , les cloisons de ce type ne sont pas facilement adaptables. Par ailleurs elles ont une surface utile de passage faible. C'est l'objet de l'invention que de proposer une cloison de séparation entre deux compartiments dans un broyeur tubulaire à boulets qui non seulement réponde aux objectifs précités mais de plus soit facilement adaptable pour tenir compte des paramètres de fonctionnement du broyeur et qui ait une plus grande surface active de passage. De manière connue , la cloison comporte des barres rectilignes et parallèles , chaque couple de barres adjacentes délimitant une lumière de passage du matériau. De manière caractéristique les barres se présentent sous la forme de deux rangées parallèles, les barres de la seconde rangée étant décalées transversalement par rapport à celles de la première rangée de telle sorte qu'une lumière de passage est déterminée par un couple de deux barres appartenant l'une à la première et l'autre à la seconde rangée et les extrémités des barres sont fixées sur un support annulaire fixé sur la partie intérieure de la virole du broyeur.Partition walls having rectilinear and parallel bars have already been produced in particular by patent US.A.1,362,334, each pair of two adjacent bars delimiting a light for passage of the material. However, the bars being welded together, the partitions of this type are not easily adaptable. Furthermore, they have a small useful passage surface. It is the object of the invention to provide a partition between two compartments in a tubular ball mill which not only meets the above-mentioned objectives but also is easily adaptable to take account of the operating parameters of the mill and which have a larger active passage area. In known manner, the partition comprises rectilinear and parallel bars, each pair of adjacent bars delimiting a lumen for passage of the material. Typically the bars are in the form of two parallel rows, the bars of the second row being offset transversely with respect to those of the first row so that a passing light is determined by a pair of two bars, one belonging to the first and the other to the second row, and the ends of the bars are fixed on an annular support fixed on the interior part of the shell of the mill.

Les barres ont des sections circulaires , elliptiques ou octogonales.The bars have circular, elliptical or octagonal sections.

On comprend que la largeur de la lumière de passage du matériau et donc l'écartement entre deux barres adjacentes doit être telle qu'elle n'autorise pas le passage des boulets d'un compartiment à l'autre. Cet écartement est déterminé en fonction du calibre des boulets placés, dans les deux compartiments, de part et d'autre de la cloison et tient compte également de l'usure normale des boulets en cours de fonctionnement du broyeur.It is understood that the width of the lumen of passage of the material and therefore the spacing between two adjacent bars must be such that it does not allow the passage of the balls from one compartment to the other. This spacing is determined according to the size of the balls placed in the two compartments on either side of the partition and also takes into account the normal wear of the balls during operation of the mill.

On constate qu'avec la disposition en double rangée des barres,la surface utile de passage de la matière à travers la cloison est quasiment doublée, comparativement à une cloison conventionnelle comportant des fentes d'ouverture équivalente.It can be seen that with the double row arrangement of the bars, the useful surface for the passage of the material through the partition is almost doubled, compared to a conventional partition having slots of equivalent opening.

Cette disposition particulière permet aussi par simple construction et en partant des mêmes barres d'obtenir une lumière de passage du matériau ayant une largeur adaptable. Il suffit pour cela de régler différemment l'écartement entre les deux rangées de barres lors de leur fixation sur le support annulaire.This particular arrangement also allows, by simple construction and starting from the same bars, to obtain a light for the passage of the material having an adaptable width. To do this, it suffices to adjust the spacing between the two rows of bars differently when they are fixed to the annular support.

Avantageusement la hauteur du support annulaire est comprise entre 15 et 30 % du diamètre intérieur de la virole, préférentiellement de 26%.Advantageously, the height of the annular support is between 15 and 30% of the internal diameter of the ferrule, preferably 26%.

Le support annulaire peut avoir une structure fermée, c'est-à-dire ne laissant pas passer le matériau ; il peut aussi avoir une structure ouverte , par exemple avec des fentes radiales ou concentriques sur tout ou partie de sa hauteur dont la largeur est équivalente à celle des lumières de passage entre les barres.The annular support may have a closed structure, that is to say not letting the material pass; it can also have an open structure, for example with radial or concentric slots over all or part of its height, the width of which is equivalent to that of the passage openings between the bars.

L'invention sera mieux comprise à la lecture de la description qui va maintenant être faite d'un exemple de réalisation d'une cloison de séparation entre deux compartiments d'un broyeur cylindrique à boulets comprenant deux rangées de barres parallèles, illustré par le dessin annexé dans lequel :

  • La figure 1 est une vue schématique de face de la cloison
  • La figure 2 est une vue schématique en coupe d'une partie de la cloison selon l'axe AA′ de la figure 1
  • La figure 3 est une vue schématique en coupe d'une partie de la cloison selon l'axe BB′ de la figure 1.
  • La figure 4 est une vue schématique de face d'une autre version de la cloison.
The invention will be better understood on reading the description which will now be made of an exemplary embodiment of a partition between two compartments of a cylindrical ball mill comprising two rows of parallel bars, illustrated by the attached drawing in which:
  • Figure 1 is a schematic front view of the partition
  • Figure 2 is a schematic sectional view of part of the partition along the axis AA 'of Figure 1
  • FIG. 3 is a schematic sectional view of part of the partition along the axis BB ′ in FIG. 1.
  • Figure 4 is a schematic front view of another version of the partition.

La cloison représentée à la figure 1 est disposée à l'intérieur d'un broyeur cylindrique perpendiculairement à son axe longitudinal 1 de rotation. Elle comporte des barres 2 rectilignes et parallèles entre elles, fixées à leurs deux extrémités sur le support 3 par des boulons 4. Le support 3 est lui-même fixé, par des moyens non représentés , à la virole 5 du broyeur cylindrique.The partition shown in Figure 1 is arranged inside a cylindrical grinder perpendicular to its longitudinal axis 1 of rotation. It comprises bars 2 rectilinear and parallel to each other, fixed at their two ends to the support 3 by bolts 4. The support 3 is itself fixed, by means not shown, to the shell 5 of the cylindrical crusher.

Le nombre de barres montré sur la figure 1 est volontairement limité par souci de clarté ; en réalité, pour une virole 5 ayant un diamètre intérieur de 4 m, le support 3 a une hauteur généralement comprise entre 15 et 30 % du diamètre intérieur de la virole 5, soit dans le cas présent une hauteur de 600 mm, et il y a 59 barres 2 , disposées suivant deux rangées (figure 2), l'une de 30 barres et l'autre de 29 barres. Chaque barre 2 est un cylindre métallique plein, de diamètre 90 mm dont les extrémités sont biseautées pour suivre la courbure annulaire du support 2.The number of bars shown in Figure 1 is deliberately limited for the sake of clarity; in reality, for a ferrule 5 having an internal diameter of 4 m, the support 3 has a height generally between 15 and 30% of the internal diameter of the ferrule 5, ie in this case a height of 600 mm, and there has 59 bars 2, arranged in two rows (Figure 2), one of 30 bars and the other of 29 bars. Each bar 2 is a solid metal cylinder, 90 mm in diameter, the ends of which are bevelled to follow the annular curvature of the support 2.

La figure 2 montre la disposition des barres 2 selon les deux rangées. Les barres 2a de la première rangée sont alignées suivant la même direction DD′ perpendiculaire à l'axe 1 longitudinal du broyeur. Les barres 2b de la seconde rangée sont alignées suivant la même direction EE′ parallèle à la direction DD′. La figure 2 montre aussi le mode de fixation d'une barre 2 sur le support 3. L'extrémité de la barre 2 est échancrée d'une part en sorte de s'appliquer à plat sur la plaque 6 de réglage et d'autre part en sorte de recevoir la tête du boulon 7. L'extrémité de la barre 2 et la plaque 6 sont percées d'un trou lisse ; le support 3 est percé d'un orifice taraudé ; le boulon 7 passe dans le trou lisse et l'orifice taraudé et maintient bloqués par le boulon 7, la barre 2, la plaque 6 et le support 3. L'écartement entre les deux rangées , c'est-à-dire entre les deux directions DD′ et EE′ est de l'ordre de 90 à 115 mm. L'écartement entre deux barres adjacentes de la même rangée 2a ou 2b est de 30 mm. L'écartement entre deux barres adjacentes appartenant l'une à la première rangée 2a et l'autre à la seconde rangée 2b est de 25 mm. C'est ce dernier écartement qui constitue la largeur de la lumière de passage du matériau à travers la cloison. Cet écartement est fonction du diamètre des boulets ou dimensions des corps broyants les plus petits. Pour faire varier cet écartement il suffit d'intercaler entre le support 3 et les barres 2 des plaques de réglage 6 d'une épaisseur différente.Figure 2 shows the arrangement of bars 2 along the two rows. The bars 2a of the first row are aligned in the same direction DD 'perpendicular to longitudinal axis 1 of the mill. The bars 2 b of the second row are aligned in the same direction EE ′ parallel to the direction DD ′. Figure 2 also shows the method of fixing a bar 2 on the support 3. The end of the bar 2 is notched on the one hand so as to apply flat on the adjustment plate 6 and on the other leaves so as to receive the head of the bolt 7. The end of the bar 2 and the plate 6 are pierced with a smooth hole; the support 3 is pierced with a threaded orifice; bolt 7 passes through the smooth hole and the tapped hole and keeps blocked by the bolt 7, the bar 2, the plate 6 and the support 3. The spacing between the two rows, that is to say between the two directions DD ′ and EE ′ is around 90 to 115 mm. The spacing between two adjacent bars of the same row 2 a or 2 b is 30 mm. The spacing between two adjacent bars, one belonging to the first row 2 a and the other to the second row 2 b, is 25 mm. It is this latter spacing which constitutes the width of the lumen passing the material through the partition. This spacing is a function of the diameter of the balls or dimensions of the smallest grinding bodies. To vary this spacing, it is sufficient to interpose between the support 3 and the bars 2 of the adjustment plates 6 of a different thickness.

Suivant la dimension du broyeur et le risque de déformation des barres 2, on place un ou plusieurs éléments raidisseurs disposés entre les deux rangées de barres, dont la section a la forme d'une croix et sur lesquelles prennent appui les barres des deux rangées en sorte de maintenir entre elles un écartement constant malgré les forces s'exerçant lors du fonctionnement du broyeur.Depending on the size of the crusher and the risk of deformation of the bars 2, one or more stiffening elements placed between the two rows of bars are placed, the cross section of which is in the form of a cross and on which the bars of the two rows are supported. sort of maintaining a constant spacing between them despite the forces exerted during the operation of the mill.

Le support annulaire 3, montré sur la figure 1, a une structure dite ouverte à lanterne , il est constitué par l'assemblage par soudure d'éléments de plus petites dimensions, qui sont des plaques métalliques avec de grandes ouvertures 9 , d'épaisseur 60 mm, en forme d'arceaux, en sorte d'épouser la partie intérieure de la virole 5. Selon le cas étudié le support 3 est garni de plaques d'usure 10 qui peuvent être pleines ou ajourées. L'épaisseur de ces plaques est définie par l'alignement de celles-ci avec les barres 2a et 2b. La hauteur de ces plaques délimite une zone de la cloison à travers laquelle le matériau ne peut pas passer.The annular support 3, shown in Figure 1, has a structure called open lantern, it is constituted by the assembly by welding of elements of smaller dimensions, which are metal plates with large openings 9, thick 60 mm, in the form of arcs, so as to match the inner part of the ferrule 5. According to the case studied, the support 3 is lined with wear plates 10 which can be solid or perforated. The thickness of these plates is defined by the alignment of these with bars 2 a and 2 b . The height of these plates delimits an area of the partition through which the material cannot pass.

Les boulets placés de part et d'autre de la cloison dans leur compartiment respectif sont des boulets sphériques de diamètre 110 et 100 mm d'un côté et de 90 , 80, 70 et 60 mm de l'autre.The balls placed on either side of the partition in their respective compartment are spherical balls of diameter 110 and 100 mm on one side and 90, 80, 70 and 60 mm on the other.

Dans un broyeur équipé de la cloison qui vient d'être décrite, on a chargé 98 tonnes de boulets correspondant à une hauteur de 1,3 mètre dans la virole. En fonctionnement, les scories broyées passent librement du compartiment amont vers le compartiment aval à travers les lumières de passage. La hauteur du support 3 permet de retenir dans le compartiment amont un certain niveau de scories en contact avec les boulets correspondants.In a crusher equipped with the partition which has just been described, 98 tonnes of balls were loaded, corresponding to a height of 1.3 meters in the shell. In operation, the crushed slag passes freely from the upstream compartment to the downstream compartment through the passage openings. The height of the support 3 makes it possible to retain in the upstream compartment a certain level of slag in contact with the corresponding balls.

La forme circulaire de la section des barres 2 ou éventuellement élliptique est apte à provoquer la perte de charge la plus faible tant pour le passage de la matière que pour l'écoulement de l'air de ventilation dans le broyeur.The circular shape of the section of the bars 2 or possibly elliptical is capable of causing the lowest pressure drop both for the passage of the material and for the flow of the ventilation air in the grinder.

L'invention n'est pas limitée au mode de réalisation de la cloison qui vient d'être décrit, mais en couvre toutes les variantes . En particulier on a représenté sur la figure 4 une autre version de la cloison décrite ci-dessus qui diffère par les éléments ci-après. Chaque barre 11 est constituée de deux tronçons de barre 11a et 11b fixés à une extrémité 12 sur le support annulaire 13 et dont l'autre extrémité 14 est logée libre dans un support intermédiaire 15. Ce support 15 est constitué de deux coquilles crantées, qui sont boulonnées entre elles après placement des extrémités 14 des tronçons 11a et 11b dans chacun des crans correspondants. Ainsi les tronçons de barre 11a et 11b peuvent se déplacer dans les crans sous l'effet des contraintes inhérentes au broyage sans déformation de la cloison elle-même. Une pièce d'usure circulaire 16 réalisée en plusieurs éléments amovibles recouvre la partie correspondant à la fixation des barres 11 sur le support annulaire 13 . Elle a de préférence une forme profilée pour le relevage et le classement des boulets, c'est-à-dire qu'elle comporte une inclinaison apte à éloigner les boulets de la cloison lors de la rotation du broyeur. Les plaques d'usure 17 qui protègent le support annulaire sont placées de part et d'autre dudit support et boulonnées entre elles par des boulons 18 traversants. Le support est percé d'ouvertures dans lesquelles sont logées des grilles 19. Les plaques d'usure 17 sont percées d'ouvertures qui font face à celles du support et dont les dimensions sont légèrement inférieures à celles des ouvertures du support, assurant grâce à cela le maintien des grilles 19 par simple blocage.The invention is not limited to the embodiment of the partition which has just been described, but covers all its variants. In particular there is shown in Figure 4 another version of the partition described above which differs in the following elements. Each bar 11 consists of two bar sections 11 a and 11 b fixed at one end 12 on the annular support 13 and the other end 14 of which is housed free in an intermediate support 15. This support 15 consists of two notched shells , which are bolted together after positioning the ends 14 of the sections 11a and 11b in each of the corresponding notches. Thus, the bar sections 11a and 11b can move in the notches under the effect of the stresses inherent in grinding without deformation of the partition itself. A circular wear part 16 made of several removable elements covers the part corresponding to the fixing of the bars 11 on the annular support 13. It preferably has a profiled shape for lifting and classifying the balls, that is to say that it has an inclination capable of moving the balls away from the partition during the rotation of the grinder. The wear plates 17 which protect the annular support are placed on either side of said support and bolted together by bolts 18 passing through. The support is pierced with openings in which grids are housed 19. The wear plates 17 are pierced with openings which face those of the support and whose dimensions are slightly smaller than those of the support openings, thereby ensuring the maintenance of the grids 19 by simple locking.

Claims (9)

1. Cloison de séparation d'un broyeur cylindrique à boulets du type comportant des barres (2) rectilignes et parallèles , chaque couple de deux barres adjacentes délimitant une lumière de passage du matériau, caractérisée en ce que les barres (2) se présentant sous la forme de deux rangées parallèles, les barres (2b) de la seconde rangée étant décalées transversalement par rapport à celles (2a) de la première rangée de telle sorte qu'une lumière de passage est déterminée par un couple de deux barres appartenant l'une (2a) à la première et l'autre (2b) à la seconde rangée, et en ce que les extrémités des barres sont fixées sur un support annulaire (3) fixé sur la partie intérieure de la virole (5) du broyeur.1. Partition wall of a cylindrical ball mill of the type comprising rectilinear and parallel bars (2), each pair of two adjacent bars delimiting a lumen for passage of the material, characterized in that the bars (2) appear under the shape of two parallel rows, the bars (2 b ) of the second row being offset transversely with respect to those (2 a ) of the first row so that a passing light is determined by a pair of two bars belonging one (2 a ) at the first and the other (2 b ) at the second row, and in that the ends of the bars are fixed on an annular support (3) fixed on the inner part of the ferrule (5 ) from the crusher. 2. Cloison de séparation selon la revendication 1 caractérisée en ce que le support annulaire (3) a une structure ouverte à lanterne.2. Partition wall according to claim 1 characterized in that the annular support (3) has an open lantern structure. 3. Cloison de séparation selon l'une des revendications 1 et 2 caractérisée en ce que le support annulaire (3) comporte des plaques d'usure pleines ou avec des fentes disposées radialement ou concentriquement et dont la largeur est approximativement égale à celle des lumières de passage entre les barres (2).3. Partition wall according to one of claims 1 and 2 characterized in that the annular support (3) comprises wear plates full or with slots arranged radially or concentrically and whose width is approximately equal to that of the lights passage between the bars (2). 4. Cloison de séparation selon l'une des revendications 1 et 2 caractérisée en ce que le support annulaire (3) a une hauteur comprise entre 15 et 30 % du diamètre intérieur de la virole (15), de préférence 26%.4. Partition wall according to one of claims 1 and 2 characterized in that the annular support (3) has a height between 15 and 30% of the inner diameter of the ferrule (15), preferably 26%. 5. Cloison de séparation selon la revendication 4 caractérisée en ce que pour un broyeur de diamètre intérieur de l'ordre de 4 m , le support annulaire a une hauteur de l'ordre de 600 mm et les barres ont un diamètre de l'ordre de 90 mm.5. Partition wall according to claim 4 characterized in that for a grinder with an internal diameter of around 4 m, the annular support has a height of around 600 mm and the bars have a diameter of around 90 mm. 6. Cloison de séparation selon la revendication 1 caractérisée en ce que les barres ayant un diamètre de l'ordre de 90 mm , l'écartement entre les directions des deux rangées de barre est de l'ordre de 90 à 115 mm.6. Partition wall according to claim 1 characterized in that the bars having a diameter of about 90 mm, the spacing between the directions of the two rows of bars is of the order of 90 to 115 mm. 7. Cloison de séparation selon la revendication 1 caractérisée en ce que chaque barre (11) se présente sous la forme de deux tronçons de barre (11a et 11b) , une extrémité (12) de chaque tronçon étant fixée sur le support annulaire (13) et l'autre extrémité (14) étant logée libre dans un support intermédiaire (15).7. Partition wall according to claim 1 characterized in that each bar (11) is in the form of two bar sections (11 a and 11 b ), one end (12) of each section being fixed on the annular support (13) and the other end (14) being housed free in an intermediate support (15). 8. Cloison de séparation selon la revendication 7, caractérisée en ce que le support intermédiaire (15) est constitué de deux coquilles crantées , boulonnées entre elles après placement des extrémités (14) des tronçons de barre (11a et 11b) dans chacun des crans correspondants.8. Partition wall according to claim 7, characterized in that the intermediate support (15) consists of two notched shells, bolted together after placing the ends (14) of the bar sections (11 a and 11 b ) in each corresponding notches. 9. Cloison de séparation selon la revendication 1 caractérisée en ce que la partie correspondant à la fixation des barres (11) sur le support annulaire (13) est recouverte d'une pièce d'usure circulaire, profilée pour le relevage des boulets.9. Partition wall according to claim 1 characterized in that the part corresponding to the fixing of the bars (11) on the annular support (13) is covered with a circular wearing part, profiled for lifting the balls.
EP89401985A 1988-07-12 1989-07-11 Screening partition for a cylindrical ball mill Expired - Lifetime EP0351305B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89401985T ATE76333T1 (en) 1988-07-12 1989-07-11 PARTITION WALL FOR A CYLINDRICAL BALL MILL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809751 1988-07-12
FR8809751A FR2634142A1 (en) 1988-07-12 1988-07-12 SEPARATION PARTITION OF A CYLINDRICAL BALL MILL

Publications (3)

Publication Number Publication Date
EP0351305A2 true EP0351305A2 (en) 1990-01-17
EP0351305A3 EP0351305A3 (en) 1990-10-10
EP0351305B1 EP0351305B1 (en) 1992-05-20

Family

ID=9368552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89401985A Expired - Lifetime EP0351305B1 (en) 1988-07-12 1989-07-11 Screening partition for a cylindrical ball mill

Country Status (6)

Country Link
EP (1) EP0351305B1 (en)
AT (1) ATE76333T1 (en)
DE (1) DE68901591D1 (en)
ES (1) ES2033109T3 (en)
FR (1) FR2634142A1 (en)
GR (1) GR3005278T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107670782A (en) * 2017-11-13 2018-02-09 盐城吉达环保设备有限公司 Equal wind apparatus in a kind of ball mill mill
CN109926166A (en) * 2019-04-28 2019-06-25 四川省星船城水泥股份有限公司 A kind of ball mill compartment component and ball mill

Citations (6)

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Publication number Priority date Publication date Assignee Title
US1362334A (en) * 1919-03-10 1920-12-14 Frank E Marcy Ball-mill
US1444101A (en) * 1922-05-27 1923-02-06 Worthington Pump & Mach Corp Tube mill
SU623579A1 (en) * 1977-02-24 1978-09-15 Государственный Всесоюзный Научно-Исследовательский Институт Цементной Промышленности "Ниицемент" Tubular mill interchamber partition
SU795560A1 (en) * 1979-03-21 1981-01-15 Белгородский Технологическийинститут Строительных Материалов Interchamber partition for tube mills
DE3023311A1 (en) * 1980-06-21 1982-01-14 Draiswerke Gmbh, 6800 Mannheim Ball mill with discharge opening - has closure plate flush with mill container inner surface covering discharge perforations
SU1031506A1 (en) * 1982-03-24 1983-07-30 Белгородский технологический институт строительных материалов им.И.А.Гришманова Interchamber partition

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Publication number Priority date Publication date Assignee Title
US1362334A (en) * 1919-03-10 1920-12-14 Frank E Marcy Ball-mill
US1444101A (en) * 1922-05-27 1923-02-06 Worthington Pump & Mach Corp Tube mill
SU623579A1 (en) * 1977-02-24 1978-09-15 Государственный Всесоюзный Научно-Исследовательский Институт Цементной Промышленности "Ниицемент" Tubular mill interchamber partition
SU795560A1 (en) * 1979-03-21 1981-01-15 Белгородский Технологическийинститут Строительных Материалов Interchamber partition for tube mills
DE3023311A1 (en) * 1980-06-21 1982-01-14 Draiswerke Gmbh, 6800 Mannheim Ball mill with discharge opening - has closure plate flush with mill container inner surface covering discharge perforations
SU1031506A1 (en) * 1982-03-24 1983-07-30 Белгородский технологический институт строительных материалов им.И.А.Гришманова Interchamber partition

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Title
SOVIET INVENTIONS ILLUSTRATED, semaine 8417, 6 juin 1984, section Mechanical, Classe P41, no. 84-106548/17, Derwent Publications Ltd, Londres, GB; & SU-A-1 031 506 (BELGOROD CONS MATLS) 30-07-1983 *
SOVIET INVENTIONS ILLUSTRATED, semaine B27, 15 août 1979, section Mechanical, Classe P41, no. F87708B/27, Derwent Publications Ltd, Londres, GB; & SU-A-623 579 (CEMENT. IND. RES. INST.) 26-07-1978 *
SOVIET INVENTIONS ILLUSTRATED, semaine D39, 4 novembre 1981, section Mechanical, classe P41, no. K1159 D/39, Derwent Publications Ltd, Londres, GB; & SU-A-795 560 (BELGOROD CONS. MAT.) 15-01-1981 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107670782A (en) * 2017-11-13 2018-02-09 盐城吉达环保设备有限公司 Equal wind apparatus in a kind of ball mill mill
CN109926166A (en) * 2019-04-28 2019-06-25 四川省星船城水泥股份有限公司 A kind of ball mill compartment component and ball mill

Also Published As

Publication number Publication date
DE68901591D1 (en) 1992-06-25
ATE76333T1 (en) 1992-06-15
FR2634142A1 (en) 1990-01-19
EP0351305A3 (en) 1990-10-10
GR3005278T3 (en) 1993-05-24
ES2033109T3 (en) 1993-03-01
EP0351305B1 (en) 1992-05-20

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