EP1181101B1 - Ball mill - Google Patents

Ball mill Download PDF

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Publication number
EP1181101B1
EP1181101B1 EP00925386A EP00925386A EP1181101B1 EP 1181101 B1 EP1181101 B1 EP 1181101B1 EP 00925386 A EP00925386 A EP 00925386A EP 00925386 A EP00925386 A EP 00925386A EP 1181101 B1 EP1181101 B1 EP 1181101B1
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EP
European Patent Office
Prior art keywords
drum
journal
tube
rigid
pulverized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP00925386A
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German (de)
French (fr)
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EP1181101A1 (en
Inventor
Daniel Fontanille
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Alstom SA
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Alstom SA
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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
    • B02C17/183—Feeding or discharging devices
    • 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
    • B02C17/183—Feeding or discharging devices
    • B02C17/186—Adding fluid, other than for crushing by fluid energy
    • B02C17/1875—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone

Definitions

  • the invention relates to a grinding installation comprising a ball mill comprising a rotary drum with a horizontal axis, each end of which comprises a pin resting on a bearing, the mill being supplied with material to be ground and gas by at least one of its ends by means of a supply device comprising a pipe supply of material to be ground, a rigid gas injection tube passing axially through the corresponding pin, said rigid tube and said pin defining between them a conduit annular, said supply piping opening into said annular conduit at proximity to the corresponding journal, said journal containing a helical structure rigid like Archimedes screw arranged around said rigid gas injection tube, said rigid helical structure rotating with the drum during its rotation to drive the material to be ground towards the inside of the rotating drum, an outlet pipe communicating with said annular conduit for the ejection from the drum of the mixture constituted by gas and by the ground material in powder form.
  • Such installations are used in particular for grinding solid fuels into view of their use in pulverized form for the supply of burners for boilers.
  • the balls or other equivalent grinding elements made of hard material, pulverize by crushing, crushing and / or attrition the elements of material to be ground which are introduced in the rotary drum in the form of more or less large pieces through the pins which support the drum at its ends. Transport of the material outside the drum, after spraying, is ensured by means of a gas. This gas is introduced into the drum of the crusher along with the material to be ground through the pins and there follows a circuit allowing him to come out.
  • the gas used is generally air.
  • This pulverized material has, in general, a particle size relatively large and it is known to make it cross a separator which does not let pass than fine grains of material and that recycles coarse grains by returning them to the drum.
  • Document US-A-2 285 429 describes a grinding installation as defined above.
  • the gas used to transport the pulverized material is introduced into the through a trunnion via a hollow tube carrying the Archimedes screw and arranged coaxially in this journal.
  • This hollow tube rotates on its axis with the mill drum and it is fixed by a system of bars inside this drum, which leads to that at less certain parts of this system of bars are subjected to the shocks of the balls in movement, when the drum rotates.
  • the hollow tube is supported by a bearing which must be impermeable to the dust carried by the propellant once charged and which must be continuously cooled to evacuate the calories that the gas provides, when it has been previously heated for drying.
  • the present invention aims to overcome these drawbacks and proposes an installation for grinding as defined above, characterized in that said supply pipe in material to be ground is substantially vertical and opens into said annular duct at level of a guide element making it possible to direct the material to be ground transmitted by the piping to the drum, in that said rigid gas injection tube is maintained stationary and enters the trunnion through the said guide element from the outside and in that said rigid helical structure is fixed to the pin.
  • the injection tube which is axially inserted into each journal at one end of the drum, is mounted on an immobilization gantry, movable relative to this drum.
  • the example of a grinding installation presented in FIG. 1 includes a device 10 supply of material to be ground and a ball mill 20 powered by this device, the treated material being for example coal.
  • the device 10 includes a storage hopper 1 supplying a chain conveyor 3 with the pieces constituting the material to be ground.
  • the conveyor is placed in a box 4 and driven by a motor 5, it brings the pieces to be ground to the upper end of a vertical or substantially vertical tubing 6 into which these pieces fall.
  • the crusher 20 comprises a rotary drum whose axis of rotation is horizontal or substantially horizontal.
  • This drum has a cylindrical central portion 11 of revolution extending by a conical part 12, 13 towards each of its ends at level of each of which is fixed a pin 14, 15 for supporting the drum. Both pins are each placed on a bearing 16, 17.
  • the drum is rotated by a gear motor not shown, it is filled with balls 27, of hard material, for example steel, or functionally equivalent hard elements.
  • the installation is preferably symmetrical, in particular with regard to the arrangements described below, which include the vertical pipes 6 for supplying material to grind, located at both ends of the grinder.
  • the pieces of material to be ground falls in each pipe, such as 6, which opens near a end of drum where a pin is mounted, such as pin 15.
  • the end bottom of each pipe is connected to a nozzle 7 of an end fitting 8 which is connected to the drum at the end of a journal, such as 15, by a nozzle 9 and via a rotary joint, these elements being more particularly illustrated in FIGS. 2 and 3.
  • the pieces of material to be ground which fall into a pipe, such as 6, are directed to the drum by means of a guide element 31 which is for example of the plate type inclined.
  • This element is here assumed to be a wall, removable or not, of the fitting 8, which comes position itself under the lower end of a pipe and opposite the opening that has a journal in the axis of the drum with an oblique orientation with respect to the axes respective lengths of the piping and the drum.
  • a rigid gas injection tube 41 passes through the connector from side to side to align along the longitudinal axis XX 'of a journal in which it is positioned, when the fitting is in place in the grinder, as seen in Figures 1 and 3.
  • this tube 41 is a rectilinear tube with a cross section of shape elliptical whose major axis is preferably arranged vertically, it crosses the wall which constitutes the guide element 31 to allow gas to be injected into the drum from the exterior, as symbolized by arrow A. This gas is intended to transport the material, after spraying.
  • the tube 41 is mounted on an immobilization gantry 42 movable by relation to the drum which therefore makes it possible to simply introduce it and extract it from the journal 15 where he comes to slip on.
  • the connector 8 and the tube 41 are carried by the gantry 42 which allows them to be moved relative to the drum so as to position the fitting relative to the journal to which it is connected by a rotating joint.
  • the gantry 42 is here assumed to be mounted on wheels. It allows to move the tube-fitting assembly before it is immobilized in the required position in the installation vis-à-vis one of the drum journals. 11 also allows the axial opening of the pin to be completely released and of the drum by a reverse movement.
  • the length of the portion of tube 41 which passes through a pin 15 is preferably chosen so that the end of this tube does not enter the area, inside the drum, where the balls and pieces of material to be ground during the rotation move of this drum.
  • the penetration of this tube 41 in a pin is therefore limited so that the end of this tube, through which gas is injected into the drum, is housed inside the trunnion, slightly set back from the main body of the drum.
  • the dimensions of the tube 41 are chosen so as to provide a shaped duct 35 annular between its outer wall and the inner wall of the journal where this tube comes introduce axially.
  • This annular duct is used to transport pieces of material to be ground which is directed towards the interior of the drum by a guide element 31.
  • a helical structure 32 of the Archimedes screw type, is therefore fixed so as to rotate around the tube 41 with the pin 15, when the drum is rotating. She is scheduled to drive, towards the inside of the drum, the pieces, deflected by the guide member, which thus move along the outside of the tube 41.
  • this structure is preferably rigid and hard, to resist the push of pieces of material to be ground and rubbed.
  • the annular duct 35 is also traversed by the mixture consisting of gas and the sprayed material. This route is done in the direction opposite to that followed by the pieces of material to be ground. This two-way traffic material to be ground and pulverized material is possible because the blades of the helical structure 32 are sufficiently spaced from the tube 41 as it appears on the figure 3.
  • the mixture, ejected out of the drum is transmitted, via the annular conduit and to the through the connector 8, to an outlet pipe 36 connected to an end piece 44 of this connector.
  • This mixture consisting of gas and pulverized material is here symbolized by the arrow B, it is by example used to supply fuel to a boiler.
  • the drum end fitting includes end fittings for vertical piping and outlet pipe.
  • the axes respective of these tips are in the same plane perpendicular to the axis of the injection tube gas passing through the fitting, at the level of the guide element, the latter being here assumed constituted in the form of a plane, obliquely arranged with respect to the axis of the tube and to that of the vertical pipe fitting.
  • An additional gas inlet is possibly provided for the supply of a box of drying 30, in the upper part of vertical piping 6, to favor the drying of the material to be ground.
  • the respective gas flows Aa by this box and A by the tube 41 to each end of the drum is then checked in a coordinated manner with a view to to obtain an optimal flow of mixture B at the outlet of line 36.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Dry Shavers And Clippers (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Surgical Instruments (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

The ball mill is of the type including:a rotary drum (11, 12, 13) having a horizontal axis (XX') and each end of which is supported by a journal (14, 15) which terminates it and through which passes an axial tube (41) around which it delimits an annular duct (35), a vertical pipe (6) discharging in the vicinity of the journal at the level of a guide member (31) for directing material to be pulverized from the pipe towards the drum, and an outlet duct (36) communicating with the annular duct for ejecting from the drum the mixture consisting of the gas and the pulverized material. Each journal contains a rigid helicoidal Archimedes screw structure (32) fixed to it and turning with it about the tube, when the drum rotates, which tube is a rigid immobile gas injector tube.

Description

L'invention se rapporte à une installation de broyage comprenant un broyeur à boulets comportant un tambour rotatif d'axe horizontal dont chaque extrémité comprend un tourillon reposant sur un palier, le broyeur étant alimenté en matériau à broyer et en gaz par au moins l'une de ses extrémités au moyen d'un dispositif d'alimentation comprenant une tuyauterie d'alimentation en matériau à broyer, un tube rigide d'injection de gaz traversant axialement le tourillon correspondant, ledit tube rigide et ledit tourillon définissant entre eux un conduit annulaire, ladite tuyauterie d'alimentation débouchant dans ledit conduit annulaire à proximité du tourillon correspondant, ledit tourillon contenant une structure hélicoïdale rigide du genre vis d'Archimède disposée autour dudit tube rigide d'injection de gaz, ladite structure hélicoïdale rigide tournant avec le tambour lors de sa rotation pour entraíner le matériau à broyer vers l'intérieur du tambour rotatif, une conduite de sortie communiquant avec ledit conduit annulaire pour l'éjection hors du tambour du mélange constitué par du gaz et par le matériau broyé sous forme de poudre.The invention relates to a grinding installation comprising a ball mill comprising a rotary drum with a horizontal axis, each end of which comprises a pin resting on a bearing, the mill being supplied with material to be ground and gas by at least one of its ends by means of a supply device comprising a pipe supply of material to be ground, a rigid gas injection tube passing axially through the corresponding pin, said rigid tube and said pin defining between them a conduit annular, said supply piping opening into said annular conduit at proximity to the corresponding journal, said journal containing a helical structure rigid like Archimedes screw arranged around said rigid gas injection tube, said rigid helical structure rotating with the drum during its rotation to drive the material to be ground towards the inside of the rotating drum, an outlet pipe communicating with said annular conduit for the ejection from the drum of the mixture constituted by gas and by the ground material in powder form.

De telles installations sont décrites par US-A-2 285 429, EP-A-0 234 017 et US-A-5 873 532.Such installations are described by US-A-2,285,429, EP-A-0 234 017 and US-A-5 873 532.

De telles installations sont notamment utilisées pour le broyage des combustibles solides en vue de leur utilisation sous forme pulvérisée pour l'alimentation de brûleurs pour chaudière. Les boulets ou autres éléments broyants équivalents, réalisés en matériau dur, pulvérisent par écrasement, trituration et/ou attrition les éléments de matériau à broyer qui sont introduits dans le tambour rotatif sous forme de morceaux plus ou moins gros au travers des tourillons qui supportent le tambour à ses extrémités. Le transport du matériau à l'extérieur du tambour, après pulvérisation, est assuré par l'intermédiaire d'un gaz. Ce gaz est introduit dans le tambour du broyeur en même temps que le matériau à broyer au travers des tourillons et il suit un circuit lui permettant d'en ressortir. Le gaz utilisé est en général de l'air. Il est introduit dans le tambour, soit au niveau d'un des tourillons pour ressortir par l'autre, après s'être chargé de matériau en poudre, soit encore symétriquement par chacun des deux tourillons au travers desquels il ressort à contre-courant avec le matériau pulvérisé en raison de la présence d'éléments déviateurs.Such installations are used in particular for grinding solid fuels into view of their use in pulverized form for the supply of burners for boilers. The balls or other equivalent grinding elements, made of hard material, pulverize by crushing, crushing and / or attrition the elements of material to be ground which are introduced in the rotary drum in the form of more or less large pieces through the pins which support the drum at its ends. Transport of the material outside the drum, after spraying, is ensured by means of a gas. This gas is introduced into the drum of the crusher along with the material to be ground through the pins and there follows a circuit allowing him to come out. The gas used is generally air. It is introduced into the drum, either at one of the pins to come out through the other, after being loaded with powdered material, either symmetrically by each of the two trunnions through which it comes out against the current with the material sprayed due the presence of deflecting elements.

Lorsque le matériau à broyer est humide, le gaz injecté est chauffé. Il assure alors un séchage du matériau pulvérisé qu'il transporte. Ce matériau pulvérisé a, en général, une granulométrie relativement étendue et il est connu de le faire traverser un séparateur qui ne laisse passer que les grains fins de matériau et qui recycle les grains grossiers en les renvoyant dans le tambour.When the material to be ground is wet, the injected gas is heated. It then ensures drying of the sprayed material it carries. This pulverized material has, in general, a particle size relatively large and it is known to make it cross a separator which does not let pass than fine grains of material and that recycles coarse grains by returning them to the drum.

Le document US-A-2 285 429 décrit une installation de broyage telle que définie ci-dessus. Dans l'installation décrite, le gaz servant au transport du matériau pulvérisé est introduit au travers d'un tourillon par l'intermédiaire d'un tube creux portant la vis d'Archimède et disposé coaxialement dans ce tourillon. Ce tube creux tourne sur son axe avec le tambour du broyeur et il est fixé par un système de barres à l'intérieur de ce tambour, ce qui conduit à ce qu'au moins certaines parties de ce système de barres soient soumises aux chocs des boulets en mouvement, lorsque le tambour tourne. Le soutien du tube creux est assuré par un palier qui doit être étanche à la poussière que transporte le gaz propulseur une fois chargé et qui doit être refroidi en permanence pour évacuer les calories que le gaz apporte, lorsqu'il a été préalablement chauffé à des fins de séchage.Document US-A-2 285 429 describes a grinding installation as defined above. In the installation described, the gas used to transport the pulverized material is introduced into the through a trunnion via a hollow tube carrying the Archimedes screw and arranged coaxially in this journal. This hollow tube rotates on its axis with the mill drum and it is fixed by a system of bars inside this drum, which leads to that at less certain parts of this system of bars are subjected to the shocks of the balls in movement, when the drum rotates. The hollow tube is supported by a bearing which must be impermeable to the dust carried by the propellant once charged and which must be continuously cooled to evacuate the calories that the gas provides, when it has been previously heated for drying.

L'installation dans un tourillon de tambour d'un tube fixé dans le tambour et sur un palier d'extrémité ne favorise pas l'accès aux pièces d'usure du broyeur, tels que notamment les boulets, les vis d'Archimède, les barres de support de tube creux. Il faut alors démonter d'autres pièces, pour pouvoir accéder aux pièces d'usure considérées ci-dessus, ce qui a notamment pour conséquence d'augmenter les temps de maintenance et d'indisponibilité du broyeur.The installation in a drum journal of a tube fixed in the drum and on a bearing end does not favor access to the wear parts of the mill, such as in particular the balls, Archimedes' screws, hollow tube support bars. You must then disassemble other parts, to be able to access the wearing parts considered above, which has in particular as a consequence of increasing the maintenance and unavailability times of the mill.

La présente invention a pour but de pallier ces inconvénients et propose une installation de broyage telle que définie ci-dessus, caractérisée en ce que ladite tuyauterie d'alimentation en matériau à broyer est sensiblement verticale et débouche dans ledit conduit annulaire au niveau d'un élément de guidage permettant de diriger le matériau à broyer transmis par la tuyauterie vers le tambour, en ce que ledit tube rigide d'injection de gaz est maintenu immobile et pénètre dans le tourillon en traversant depuis l'extérieur ledit élément de guidage et en ce que ladite structure hélicoïdale rigide est fixée au tourillon.The present invention aims to overcome these drawbacks and proposes an installation for grinding as defined above, characterized in that said supply pipe in material to be ground is substantially vertical and opens into said annular duct at level of a guide element making it possible to direct the material to be ground transmitted by the piping to the drum, in that said rigid gas injection tube is maintained stationary and enters the trunnion through the said guide element from the outside and in that said rigid helical structure is fixed to the pin.

Le tube d'injection, qui est axialement introduit dans chaque tourillon à une extrémité du tambour, est monté sur un portique d'immobilisation, déplaçable par rapport à ce tambour.The injection tube, which is axially inserted into each journal at one end of the drum, is mounted on an immobilization gantry, movable relative to this drum.

L'invention, ses caractéristiques et ses avantages sont précisés dans la description qui suit en liaison avec les figures évoquées ci-dessous.

  • La figure 1 présente une vue en coupe longitudinale d'une installation de broyage de charbon.
  • Les figures 2 et 3 présentent respectivement une vue schématique en bout et une coupe schématique longitudinale d'un raccord d'extrémité pour broyeur selon l'invention.
    • The invention, its characteristics and its advantages are explained in the following description in conjunction with the figures mentioned below.
  • Figure 1 shows a longitudinal sectional view of a coal grinding installation.
  • Figures 2 and 3 respectively show a schematic end view and a schematic longitudinal section of an end fitting for mill according to the invention.

    • L'exemple d'installation de broyage présenté sur la figure 1, comprend un dispositif 10 d'alimentation en matériau à broyer et un broyeur à boulets 20 alimenté par ce dispositif, le matériau traité étant par exemple du charbon.The example of a grinding installation presented in FIG. 1 includes a device 10 supply of material to be ground and a ball mill 20 powered by this device, the treated material being for example coal.

    Le dispositif 10 comporte une trémie de stockage 1 alimentant un convoyeur à chaíne 3 avec les morceaux constituant le matériau à broyer. Le convoyeur est placé dans un caisson 4 et entraíné par un moteur 5, il amène les morceaux à broyer jusqu'à l'extrémité supérieure d'une tuyauterie 6 verticale ou sensiblement verticale dans lequel ces morceaux tombent.The device 10 includes a storage hopper 1 supplying a chain conveyor 3 with the pieces constituting the material to be ground. The conveyor is placed in a box 4 and driven by a motor 5, it brings the pieces to be ground to the upper end of a vertical or substantially vertical tubing 6 into which these pieces fall.

    Le broyeur 20 comporte un tambour rotatif dont l'axe de rotation est horizontal ou sensiblement horizontal. Ce tambour comporte une partie centrale 11 cylindrique de révolution se prolongeant par une partie conique 12, 13 vers chacune de ses extrémités au niveau de chacune desquelles est fixé un tourillon 14, 15 de support du tambour. Les deux tourillons sont posés chacun sur un palier 16, 17. Le tambour est entraíné en rotation par un moto-réducteur non représenté, il est rempli de boulets 27, en matériau dur, par exemple en acier, ou d'éléments durs fonctionnellement équivalents.The crusher 20 comprises a rotary drum whose axis of rotation is horizontal or substantially horizontal. This drum has a cylindrical central portion 11 of revolution extending by a conical part 12, 13 towards each of its ends at level of each of which is fixed a pin 14, 15 for supporting the drum. Both pins are each placed on a bearing 16, 17. The drum is rotated by a gear motor not shown, it is filled with balls 27, of hard material, for example steel, or functionally equivalent hard elements.

    L'installation est préférablement symétrique, notamment en ce qui concerne les agencements décrits ci-dessous, qui incluent les tuyauteries verticales 6 d'alimentation en matériau à broyer, situés aux deux extrémités du broyeur. Comme indiqué plus haut, les morceaux de matériau à broyer tombent dans chaque tuyauterie, telle 6, qui débouche à proximité d'une extrémité de tambour où est monté un tourillon, tel le tourillon 15. A cet effet l'extrémité inférieure de chaque tuyauterie est connectée à un embout 7 d'un raccord d'extrémité 8 qui vient se raccorder au tambour à l'extrémité d'un tourillon, tel que 15, par un embout 9 et via un joint tournant, ces éléments étant plus particulièrement illustrés les figures 2 et 3. Les morceaux de matériau à broyer qui tombent dans une tuyauterie, telle que 6, sont dirigés vers le tambour par l'intermédiaire d'un élément de guidage 31 qui est par exemple de type plaque inclinée. Cet élément est ici supposé être une paroi, amovible ou non, du raccord 8, qui vient se positionner sous l'extrémité inférieure d'une tuyauterie et en regard de l'ouverture que présente un tourillon dans l'axe du tambour avec une orientation oblique par rapport aux axes longitudinaux respectifs de la tuyauterie et du tambour.The installation is preferably symmetrical, in particular with regard to the arrangements described below, which include the vertical pipes 6 for supplying material to grind, located at both ends of the grinder. As noted above, the pieces of material to be ground falls in each pipe, such as 6, which opens near a end of drum where a pin is mounted, such as pin 15. For this purpose the end bottom of each pipe is connected to a nozzle 7 of an end fitting 8 which is connected to the drum at the end of a journal, such as 15, by a nozzle 9 and via a rotary joint, these elements being more particularly illustrated in FIGS. 2 and 3. The pieces of material to be ground which fall into a pipe, such as 6, are directed to the drum by means of a guide element 31 which is for example of the plate type inclined. This element is here assumed to be a wall, removable or not, of the fitting 8, which comes position itself under the lower end of a pipe and opposite the opening that has a journal in the axis of the drum with an oblique orientation with respect to the axes respective lengths of the piping and the drum.

    Un tube rigide 41 d'injection de gaz traverse le raccord de part en part pour venir s'aligner selon l'axe longitudinal XX' d'un tourillon dans lequel il vient se positionner, lorsque le raccord est en place dans le broyeur, comme on le voit sur les figures 1 et 3. Dans la réalisation présentée, ce tube 41 est un tube rectiligne à section transversale d'allure elliptique dont le grand axe est préférablement disposé verticalement, il traverse la paroi qui constitue l'élément de guidage 31 pour permettre l'injection de gaz dans le tambour depuis l'extérieur, comme symbolisé par la flèche A. Ce gaz est destiné à assurer le transport du matériau, après pulvérisation. A rigid gas injection tube 41 passes through the connector from side to side to align along the longitudinal axis XX 'of a journal in which it is positioned, when the fitting is in place in the grinder, as seen in Figures 1 and 3. In the embodiment shown, this tube 41 is a rectilinear tube with a cross section of shape elliptical whose major axis is preferably arranged vertically, it crosses the wall which constitutes the guide element 31 to allow gas to be injected into the drum from the exterior, as symbolized by arrow A. This gas is intended to transport the material, after spraying.

    Selon l'invention, le tube 41 est monté sur un portique d'immobilisation 42 déplaçable par rapport au tambour qui permet donc de l'introduire simplement et de l'extraire du tourillon 15 où il vient s'enfiler. Dans une forme préférée de réalisation le raccord 8 et le tube 41 sont portés par le portique 42 qui permet de les déplacer par rapport au tambour de manière à positionner le raccord par rapport au tourillon auquel il se connecte par un joint tournant.According to the invention, the tube 41 is mounted on an immobilization gantry 42 movable by relation to the drum which therefore makes it possible to simply introduce it and extract it from the journal 15 where he comes to slip on. In a preferred embodiment the connector 8 and the tube 41 are carried by the gantry 42 which allows them to be moved relative to the drum so as to position the fitting relative to the journal to which it is connected by a rotating joint.

    Le portique 42 est ici supposé monté sur roues. Il permet de déplacer l'ensemble tube-raccord avant que celui-ci ne soit immobilisé en position requise dans l'installation vis-à-vis d'un des tourillons du tambour. 11 permet aussi de dégager totalement l'ouverture axiale du tourillon et du tambour par un déplacement de sens inverse.The gantry 42 is here assumed to be mounted on wheels. It allows to move the tube-fitting assembly before it is immobilized in the required position in the installation vis-à-vis one of the drum journals. 11 also allows the axial opening of the pin to be completely released and of the drum by a reverse movement.

    .La longueur de la portion de tube 41 qui traverse dans un tourillon 15 est préférablement choisie de manière que l'extrémité de ce tube ne pénètre pas dans la zone, intérieure au tambour, où se meuvent les boulets et les morceaux de matériau à broyer lors de la rotation de ce tambour. La pénétration de ce tube 41 dans un tourillon est donc limitée de manière que l'extrémité de ce tube, par laquelle du gaz est injecté dans le tambour, soit logée à l'intérieur du tourillon, légèrement en retrait par rapport au corps principal du tambour.The length of the portion of tube 41 which passes through a pin 15 is preferably chosen so that the end of this tube does not enter the area, inside the drum, where the balls and pieces of material to be ground during the rotation move of this drum. The penetration of this tube 41 in a pin is therefore limited so that the end of this tube, through which gas is injected into the drum, is housed inside the trunnion, slightly set back from the main body of the drum.

    Les dimensions du tube 41 sont choisies de manière à ménager un conduit 35 de forme annulaire entre sa paroi extérieure et la paroi intérieure du tourillon où ce tube vient s'introduire axialement. Ce conduit annulaire est utilisé pour le transport des morceaux de matériau à broyer qui sont dirigés vers l'intérieur du tambour par un élément de guidage 31. Une structure hélicoïdale 32, du genre vis d'Archimède, est donc fixée de manière à tourner autour du tube 41 avec le tourillon 15, lorsque le tambour est en rotation. Elle est prévue pour entraíner, vers l'intérieur du tambour, les morceaux, déviés par l'organe de guidage, qui se déplacent ainsi en longeant extérieurement le tube 41. Dans la réalisation envisagée, cette structure est préférablement rigide et dure, pour résister à la poussée des morceaux de matériau à broyer et aux frottements.The dimensions of the tube 41 are chosen so as to provide a shaped duct 35 annular between its outer wall and the inner wall of the journal where this tube comes introduce axially. This annular duct is used to transport pieces of material to be ground which is directed towards the interior of the drum by a guide element 31. A helical structure 32, of the Archimedes screw type, is therefore fixed so as to rotate around the tube 41 with the pin 15, when the drum is rotating. She is scheduled to drive, towards the inside of the drum, the pieces, deflected by the guide member, which thus move along the outside of the tube 41. In the envisaged embodiment, this structure is preferably rigid and hard, to resist the push of pieces of material to be ground and rubbed.

    Dans l'exemple de réalisation proposé, le conduit annulaire 35 est également parcouru par le mélange constitué par du gaz et par le matériau pulvérisé. Ce parcours s'effectue en sens inverse de celui suivi par les morceaux de matériau à broyer. Cette circulation en double sens du matériau à broyer et du matériau pulvérisé est possible du fait que les aubes de la structure hélicoïdale 32 sont suffisamment espacés du tube 41 comme cela apparaít sur la figure 3. Le mélange, éjecté hors du tambour est transmis, via le conduit annulaire et au travers du raccord 8, vers une conduite de sortie 36 reliée à un embout 44 de ce raccord. Ce mélange constitué de gaz et de matériau pulvérisé est ici symbolisé par la flèche B, il est par exemple exploité pour l'alimentation en combustible d'une chaudière.In the proposed embodiment, the annular duct 35 is also traversed by the mixture consisting of gas and the sprayed material. This route is done in the direction opposite to that followed by the pieces of material to be ground. This two-way traffic material to be ground and pulverized material is possible because the blades of the helical structure 32 are sufficiently spaced from the tube 41 as it appears on the figure 3. The mixture, ejected out of the drum is transmitted, via the annular conduit and to the through the connector 8, to an outlet pipe 36 connected to an end piece 44 of this connector. This mixture consisting of gas and pulverized material is here symbolized by the arrow B, it is by example used to supply fuel to a boiler.

    Dans l'exemple de réalisation proposé, le raccord d'extrémité de tambour comporte des embouts de raccordement à la tuyauterie verticale et à la conduite de sortie. Les axes respectifs de ces embouts sont dans un même plan perpendiculaire à l'axe du tube d'injection de gaz qui traverse le raccord, au niveau de l'élément de guidage, ce dernier étant ici supposé constitué sous la forme d'un plan, obliquement disposé par rapport à l'axe du tube et à celui de l'embout de tuyauterie verticale.In the proposed embodiment, the drum end fitting includes end fittings for vertical piping and outlet pipe. The axes respective of these tips are in the same plane perpendicular to the axis of the injection tube gas passing through the fitting, at the level of the guide element, the latter being here assumed constituted in the form of a plane, obliquely arranged with respect to the axis of the tube and to that of the vertical pipe fitting.

    Une entrée de gaz additionnel est éventuellement prévue pour l'alimentation d'une boíte de séchage 30, en partie haute de tuyauterie verticale 6, pour favoriser la dessiccation du matériau à broyer. Les débits de gaz respectifs Aa par cette boíte et A par le tube 41 à chacune des extrémités du tambour sont alors contrôlés de manière coordonnée en vue d'obtenir un débit optimal de mélange B en sortie de conduite 36.An additional gas inlet is possibly provided for the supply of a box of drying 30, in the upper part of vertical piping 6, to favor the drying of the material to be ground. The respective gas flows Aa by this box and A by the tube 41 to each end of the drum is then checked in a coordinated manner with a view to to obtain an optimal flow of mixture B at the outlet of line 36.

    Claims (8)

    1. A pulverizing installation comprising a ball mill including a rotary drum (11, 12, 13) having a horizontal axis (XX') and each end of which comprises a journal (14, 15) resting on a bearing (16, 17), the mill being fed with material to be pulverized and with gas via at least one of its ends by means of a feed device comprising a feed pipe (6) for feeding with material to be pulverized, a rigid gas injector tube (41) passing axially through the corresponding journal (14, 15), said rigid tube (41) and said journal (14, 15) defining therebetween an annular duct (35), said feed pipe (6) discharging into said annular duct (35) in the vicinity of the corresponding journal (14, 15), said journal (14, 15) containing a rigid helicoidal Archimedes screw structure (32) disposed about said rigid gas injector tube (41), said rigid helicoidal structure (32) turning with the drum when the drum rotates in order to feed the material to be pulverized towards the interior of the rotary drum (11, 12, 13), an outlet duct (36) communicating with said annular duct (35) for ejecting the mixture constituted by the gas and by the material pulverized in the form of powder out of the drum, the installation being characterized in that said feed pipe (6) for feeding material to be pulverized is substantially vertical and discharges into said annular duct (35) at the level of a guide member (31) for directing the material to be pulverized as conveyed by the pipe (6) towards the drum, in that said rigid gas injector tube (41) is held immobile and penetrates into the journal (14, 15) by passing through said guide member (31) from the outside, and in that said rigid helicoidal structure (32) is fixed to the journal (14, 15).
    2. An installation according to claim 1, wherein the rigid gas injector tube (41) is mounted on an immobilizing frame (42).
    3. An installation according to claim 2, wherein the rigid gas injector tube (41) and said guide member (31) are mounted on the same immobilizing frame.
    4. An installation according to claim 3, wherein the tube (41) and the guide member (31) at one end of the drum and carried by the same immobilizing frame (42) are incorporated into an end connector (8) of the drum which is butted against that end of the drum and butt-jointed to the respective ends of said vertical pipe (6) and said outlet duct (36).
    5. An installation according to claim 4, wherein said guide member (31) takes the form of a plate disposed obliquely to the axes of the tube (41) and the coupling member of the vertical pipe (6), and the end connector (8) of the drum includes coupling members (7, 44) for connecting it to the vertical pipe (6) and to the outlet duct (36) and whose respective axes are in a common plane through said connector and perpendicular to the axis (XX') of the gas injector tube (41).
    6. An installation according to any one of claims 1 to 5, wherein the gas injector tube (41) mounted at one end of the drum discharges into the drum at a location which is set back inside the journal relative to the main part of the drum.
    7. An installation according to any one of claims 1 to 6, wherein each vertical pipe (6) includes a pre-dryer box (30) for introducing an additional hot gas into the pipe.
    8. An installation according to claim 4, characterized in that said connector (8) comprising said frame (42), the rigid gas injector tube (41), and said guide member (31) is displaceable and is connected to the journal (14, 15) via a coupling member (9) and a rotary seal.
    EP00925386A 1999-05-07 2000-05-04 Ball mill Expired - Lifetime EP1181101B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    FR9905832A FR2793168B1 (en) 1999-05-07 1999-05-07 BALL MILL
    FR9905832 1999-05-07
    PCT/FR2000/001202 WO2000067910A1 (en) 1999-05-07 2000-05-04 Ball mill

    Publications (2)

    Publication Number Publication Date
    EP1181101A1 EP1181101A1 (en) 2002-02-27
    EP1181101B1 true EP1181101B1 (en) 2003-07-02

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    ID=9545336

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP00925386A Expired - Lifetime EP1181101B1 (en) 1999-05-07 2000-05-04 Ball mill

    Country Status (14)

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    US (1) US6547171B1 (en)
    EP (1) EP1181101B1 (en)
    JP (1) JP2002543966A (en)
    CN (1) CN1209198C (en)
    AT (1) ATE244071T1 (en)
    AU (1) AU756235B2 (en)
    CA (1) CA2368066C (en)
    CZ (1) CZ20014014A3 (en)
    DE (1) DE60003678D1 (en)
    ES (1) ES2202116T3 (en)
    FR (1) FR2793168B1 (en)
    PL (1) PL194742B1 (en)
    WO (1) WO2000067910A1 (en)
    ZA (1) ZA200108760B (en)

    Families Citing this family (7)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    ITRE20060089A1 (en) * 2006-07-20 2008-01-21 Sacmi CONNECTION SYSTEM BETWEEN CONTINUOUS MILLS IN SERIES OF A MILLING PLANT
    US7975940B2 (en) * 2009-03-31 2011-07-12 Staker & Parson Companies Systems and methods for reducing the particle size of a pozzolan
    US8496750B2 (en) * 2009-03-31 2013-07-30 Staker & Parson Companies Method for reducing the particle size of a pozzolan
    DE102012013279A1 (en) * 2012-07-05 2014-01-09 Roland Nied Method for operating a stirred ball mill and agitator ball mill therefor
    US9943853B2 (en) * 2014-01-16 2018-04-17 Michael Marshall Pulverizing apparatus and method of pulverizing rocks
    CN106000557B (en) * 2016-06-18 2018-10-16 江苏新春兴再生资源有限责任公司 A kind of lead needle, the lead mud seperator of the processing thin lead grid of lead-acid accumulator
    CN114226030B (en) * 2022-01-18 2023-02-28 湖北大江环保科技股份有限公司 Timing automatic ball feeding device of ball mill

    Family Cites Families (10)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US931045A (en) * 1909-08-17 George Stockham Emerick Grinding-mill.
    US927054A (en) * 1908-03-26 1909-07-06 Ira A Knecht Tube-mill for cement, stones, and the like.
    US926441A (en) * 1908-05-13 1909-06-29 Reuben Ruland Shafter Tubular triturating-mill.
    US1719971A (en) * 1927-02-18 1929-07-09 Fahland Karl Drum-mill feeder
    DE590792C (en) * 1931-08-19 1934-01-09 Fried Krupp Grusonwerk Akt Ges Rohrmühle
    US2174630A (en) * 1936-11-12 1939-10-03 Hardinge Co Inc Classification system for pulverized materials
    US2285429A (en) * 1938-05-26 1942-06-09 Foster Wheeler Corp Pulverization
    FR2591127B1 (en) * 1985-12-11 1989-10-06 Stein Industrie ROTARY CYLINDRICAL CRUSHER FOR THE PREPARATION OF A POWDERY MATERIAL IN TWO DIFFERENT QUALITIES.
    JPH05146697A (en) * 1991-11-29 1993-06-15 Mitsubishi Heavy Ind Ltd Dry type tube mill
    FR2745731B1 (en) * 1996-03-08 1998-04-17 Gec Alsthom Stein Ind BALL MILL

    Also Published As

    Publication number Publication date
    CN1350478A (en) 2002-05-22
    PL352405A1 (en) 2003-08-25
    AU756235B2 (en) 2003-01-09
    US6547171B1 (en) 2003-04-15
    CA2368066A1 (en) 2000-11-16
    CA2368066C (en) 2007-07-17
    ZA200108760B (en) 2002-12-24
    ES2202116T3 (en) 2004-04-01
    AU4412800A (en) 2000-11-21
    JP2002543966A (en) 2002-12-24
    DE60003678D1 (en) 2003-08-07
    FR2793168B1 (en) 2001-06-22
    CN1209198C (en) 2005-07-06
    FR2793168A1 (en) 2000-11-10
    CZ20014014A3 (en) 2002-03-13
    PL194742B1 (en) 2007-06-29
    EP1181101A1 (en) 2002-02-27
    WO2000067910A1 (en) 2000-11-16
    ATE244071T1 (en) 2003-07-15

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