EP1330402A1 - Device for transferring powdery materials, and use for feeding a melting metal with powdery material - Google Patents

Device for transferring powdery materials, and use for feeding a melting metal with powdery material

Info

Publication number
EP1330402A1
EP1330402A1 EP01983649A EP01983649A EP1330402A1 EP 1330402 A1 EP1330402 A1 EP 1330402A1 EP 01983649 A EP01983649 A EP 01983649A EP 01983649 A EP01983649 A EP 01983649A EP 1330402 A1 EP1330402 A1 EP 1330402A1
Authority
EP
European Patent Office
Prior art keywords
pipe
nozzle
powder
molten metal
under pressure
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.)
Withdrawn
Application number
EP01983649A
Other languages
German (de)
French (fr)
Inventor
Thomas Issler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sotic Mecanique
Original Assignee
Sotic Mecanique
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sotic Mecanique filed Critical Sotic Mecanique
Publication of EP1330402A1 publication Critical patent/EP1330402A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/42—Nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
    • B65G53/28—Systems utilising a combination of gas pressure and suction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/58—Devices for accelerating or decelerating flow of the materials; Use of pressure generators

Definitions

  • the invention relates to an improved device, making it possible to optimize the transfer of pulverulent materials, of varying particle size. It also relates more specifically to the supply of powdered material under pressure to a pocket of a molten metal, for example intended for molding metal parts, and more specifically, aluminum.
  • This powder is generally of acidic pH, and is intended to be mixed with the molten metal to optimize the qualities required thereof depending on the parts to be produced.
  • the object of the invention is therefore first of all to propose a device making it possible to transfer pulverulent materials of variable particle size using a pressurized fluid. Furthermore, it is aimed at a device which makes it possible to overcome the various aforementioned drawbacks.
  • a device for the transfer of pulverulent materials comprising: M an enclosure in which the pulverulent material to be transferred is agitated and pressurized, enclosure at the lower end of which a pipe conveys said material in the direction of its destination ;
  • the invention consists first of all in giving the pipeline a particular profile, in particular in the form of a nozzle, known to impose on a flowing fluid an increase in its speed, this increase in speed being in further optimized by the orientation of the gas flow intended to ensure the progression of the pulverulent material.
  • the invention relates more specifically to the supply of powder under pressure to a bath of molten metal.
  • This device for supplying powder under pressure to a bath of molten metal comprising: “an enclosure, in which the powder is agitated and pressurized, enclosure at the lower end of which a pipe conveys the powder towards the molten metal bath; M an inlet for neutral gas, opening at the level of the pipe, and suitable for ensuring the progression of the powder towards said bath; is characterized in that at the neutral gas inlet, said pipe forms a nozzle, directed in the direction of flow of the powder, said nozzle opening into a second pipe, substantially of the same diameter as the first, and in that the arrival of neutral gas opens at the lower end of the first pipe, outside the nozzle, said gas entering the second pipe by means of a plurality of through orifices formed substantially in the same plane as the lower end of the nozzle, and oriented substantially parallel to the direction of flow of the powder.
  • the two pipes are secured to one another by means of rings.
  • One of the rings is also provided with two lateral orifices, diametrically distributed with respect to its generator, at the level of which the inlets of neutral gas terminate.
  • the device may have more than two inlets of neutral gas, and in this case, the ring in question is provided with as many lateral orifices.
  • Figure 1 is a side view of the installation according to the invention.
  • Figure 2 is a front view of the installation of Figure 1.
  • Figure 3 is a longitudinal sectional view of the device according to the invention.
  • Figure 4 is a schematic view partially showing the securing ring of two pipes, according to the invention.
  • Figure 5 is a bottom view of said ring.
  • FIG 1 a side view of the installation according to the invention.
  • This basically consists of a chassis (1) mounted on casters (2) to allow its movement, one or more of the rollers being provided with a braking system, in order to promote the stability of the together.
  • This alveolar distributor (6) is advantageously managed by means of a programmable automaton, the electrical cabinet of which is represented by the reference (11).
  • the pressure is in fact dependent on the flow rate, this being managed by means of variable flow valves (known under the name SMC), controlled in 0-10 volts by the programmable controller (11).
  • SMC variable flow valves
  • the gas arrives at the level of the ring (10) outside the nozzle (12), and is introduced at the level of the pipe (9) substantially at the same level as the 'lower end (13) of the nozzle.
  • the ring (10) is provided with a partition (19) perpendicular to the direction of flow of the powder, pierced on the one hand, with a central opening (23), in order to allow the introduction at this level of the lower end (13) of the nozzle (12), and on the other hand, peripheral through orifices (20), oriented parallel to said direction of flow, and intended to allow the passage of gas under pressure in the direction of the pipeline (9).
  • O-rings or lip seals (16), (17) and (18) are in place in order to ensure watertightness, in particular with respect to the neutral gas, and therefore of the entire installation.

Abstract

The invention concerns a device for transferring powdery materials, comprising: a chamber (3), wherein the powdery material to be transferred in stirred and pressurised, chamber at the lower end (7) of which a pipe (8) carries said material towards its destination; a gas intake (14, 15), and in particular of compressed air, emerging at the pipe (8), and adapted to transport the material towards said destination. At the gas intake (14, 15), said pipe (8) forms a nozzle (12), oriented in the direction of the material flow, said nozzle emerging into a second pipe (9), substantially of same diameter as the first. The gas intake (14, 15) emerges at the lower end of the first pipe, outside the nozzle (12), said gas being introduced into the second pipe (9) through a plurality of through orifices (20) arranged substantially in the same plane as the lower end (13) of the nozzle (12), and oriented substantially parallel to the flow direction of the powdery material.

Description

DISPOSITIF DE TRANSFERT DE MATERIAUX PULVERULENTS. ET APPLICATION A L'ALIMENTATION D'UN METAL EN FUSION EN MATERIAU PULVERULENTPOWDER MATERIAL TRANSFER DEVICE. AND APPLICATION TO THE FEEDING OF A FUSED METAL IN POWDER MATERIAL
L'invention concerne un dispositif perfectionné, permettant d'optimiser le transfert de matériaux pulvérulents, de granulométrie variée. Elle concerne en outre de manière plus spécifique l'alimentation en matériau pulvérulent sous pression d'une poche d'un métal en fusion, par exemple destiné au moulage de pièces métalliques, et plus spécifiquement, en aluminium.The invention relates to an improved device, making it possible to optimize the transfer of pulverulent materials, of varying particle size. It also relates more specifically to the supply of powdered material under pressure to a pocket of a molten metal, for example intended for molding metal parts, and more specifically, aluminum.
Comme on le sait, le transfert de matériaux pulvérulents constitue un problème, compte tenu de la nature physique du matériau à transporter. Ce problème est même exacerbé, dès lors que la granulométrie dudit matériau n'est pas homogène. En effet, ces différences de granulométrie peuvent engendrer des bouchons locaux, affectant bien évidemment le transfert proprement dit.As is known, the transfer of pulverulent materials is a problem, given the physical nature of the material to be transported. This problem is even exacerbated, since the particle size of said material is not homogeneous. Indeed, these differences in particle size can cause local plugs, obviously affecting the transfer proper.
Dans de nombreuses technologies mettant en œuvre les métaux, et notamment les fonderies d'aluminium, on fait appel, afin d'augmenter les qualités de l'aluminium, tant sur le plan porosité que sur le plan mécanique, à l'intégration d'une poudre sous pression, de granulométrie variable typiquement comprise entre quelques dixièmes et 5 à 10 millimètres.In many technologies using metals, and in particular aluminum foundries, in order to increase the qualities of aluminum, both in porosity and in mechanical terms, the use of a powder under pressure, of variable particle size typically between a few tenths and 5 to 10 millimeters.
Cette poudre est généralement de pH acide, et est destinée à être mélangée au métal fondu pour optimiser les qualités requises de celui-ci en fonction des pièces à réaliser.This powder is generally of acidic pH, and is intended to be mixed with the molten metal to optimize the qualities required thereof depending on the parts to be produced.
Pendant longtemps, l'intégration de la poudre au métal fondu se faisait de manière empirique et manuellement, notamment au moyen de récipients en forme de louche de relativement grandes dimensions, qui ne permettaient pas une reproductibilité des adjonctions ainsi effectuées, et donc conduisait à des pièces finales de qualité non homogène. Par ailleurs, la mise en œuvre d'une louche au niveau de bains de métaux en fusion rend la protection humaine très précaire, et conduit à de nombreux accidents, et notamment des brûlures.For a long time, the integration of the powder into the molten metal was done empirically and manually, in particular by means of ladle-shaped containers of relatively large dimensions, which did not allow reproducibility of the additions thus carried out, and therefore led to final parts of non-uniform quality. Furthermore, the use of a ladle in molten metal baths makes human protection very precarious, and leads to numerous accidents, and in particular burns.
On a alors proposé des installations automatiques permettant racheminement de ladite poudre sous pression à partir d'un réceptacle au moyen de canalisations appropriées, le transport de ladite poudre s'effectuant sous pression d'un gaz neutre, notamment l'argon. Pour autant, eu égard aux caractéristiques de la poudre, et notamment, compte-tenu de sa granulométrie très inhomogène, on aboutit pas à une progression satisfaisante de celle-ci dans les canalisations, et partant, on ne dispose pas au niveau du métal fondu, de la quantité requise, ni au niveau de la pièce définitive à réaliser, de la qualité prescrite.Automatic installations have therefore been proposed enabling said powder to be conveyed under pressure from a receptacle by means of appropriate pipes, the transport of said powder being carried out under pressure of a neutral gas, in particular argon. However, having regard to the characteristics of the powder, and in particular, given its very inhomogeneous particle size, it does not lead to a satisfactory progression of the latter in the pipes, and consequently, there is no disposal of the molten metal. , the quantity required, or at the level of the final part to be produced, of the prescribed quality.
L'objet de l'invention est donc tout d'abord, de proposer un dispositif permettant de transférer des matériaux pulvérulents de granulométrie variable à l'aide d'un fluide sous pression. Par ailleurs, elle vise un dispositif qui permette, de s'affranchir des différents inconvénients précités.The object of the invention is therefore first of all to propose a device making it possible to transfer pulverulent materials of variable particle size using a pressurized fluid. Furthermore, it is aimed at a device which makes it possible to overcome the various aforementioned drawbacks.
Elle propose un dispositif pour le transfert de matériaux pulvérulents, comprenant : M une enceinte dans laquelle le matériau pulvérulent à transférer est agité et mis sous pression, enceinte à l'extrémité inférieure de laquelle une canalisation achemine ledit matériau en direction de son Heu de destination ;It proposes a device for the transfer of pulverulent materials, comprising: M an enclosure in which the pulverulent material to be transferred is agitated and pressurized, enclosure at the lower end of which a pipe conveys said material in the direction of its destination ;
M une arrivée de gaz, et notamment d'air comprimé, débouchant au niveau de la canalisation, et propre à assurer la progression du matériau vers ledit lieu.M an inlet for gas, and in particular compressed air, emerging at the level of the pipe, and suitable for ensuring the progression of the material towards said place.
Ce dispositif se caractérise en ce qu'au niveau de l'arrivée de gaz, ladite canalisation forme une tuyère, dirigée dans le sens de l'écoulement du matériau, ladite tuyère débouchant dans une seconde canalisation, sensiblement de même diamètre que la première, et en ce que l'arrivée de gaz débouche à l'extrémité inférieure de la première canalisation, à l'extérieur de la tuyère, ledit gaz s 'introduisant dans la seconde canalisation au moyen d'une pluralité d'orifices traversants ménagés sensiblement dans le même plan que l'extrémité inférieure de la tuyère, et orientés sensiblement parallèlement au sens d'écoulement du matériau pulvérulent.This device is characterized in that at the gas inlet, said pipe forms a nozzle, directed in the direction of flow of the material, said nozzle opening into a second pipe, substantially of the same diameter as the first, and in that the gas inlet opens at the lower end of the first pipe, outside the nozzle, said gas entering the second pipe by means of a plurality of through orifices formed substantially in the same plane as the lower end of the nozzle, and oriented substantially parallel to the direction of flow of the pulverulent material.
En d'autres termes, l'invention consiste tout d'abord à conférer à la canalisation un profil particulier, notamment sous forme de tuyère, connue pour imposer à un fluide en écoulement une augmentation de sa vitesse, cette augmentation de la vitesse étant en outre optimisée de par l'orientation du flux gazeux destiné à assurer la progression du matériau pulvérulent.In other words, the invention consists first of all in giving the pipeline a particular profile, in particular in the form of a nozzle, known to impose on a flowing fluid an increase in its speed, this increase in speed being in further optimized by the orientation of the gas flow intended to ensure the progression of the pulverulent material.
Selon une caractéristique de l'invention, le dispositif comporte deux amenées de gaz, réparties de manière diamétrale par rapport à la canalisation. En outre, la solidarisation de la première et de la seconde canalisations est obtenue au moyen d'une bague, au niveau de laquelle aboutissent les canalisations d'arrivée de gaz.According to a characteristic of the invention, the device comprises two gas supplies, distributed diametrically relative to the pipe. In addition, the joining of the first and second pipes is obtained by means of a ring, at the level of which the gas inlet pipes terminate.
Comme déjà dit, l'invention vise de manière plus spécifique l'alimentation en poudre sous pression d'un bain de métal fondu.As already said, the invention relates more specifically to the supply of powder under pressure to a bath of molten metal.
Ce dispositif d'alimentation en poudre sous pression d'un bain de métal fondu, comprenant : « une enceinte, dans laquelle la poudre est agitée et mise sous pression, enceinte à l'extrémité inférieure de laquelle une canalisation achemine la poudre en direction du bain de métal fondu ; M une arrivée de gaz neutre, débouchant au niveau de la canalisation, et propre à assurer la progression de la poudre vers ledit bain ; se caractérise en ce qu'au niveau de l'arrivée de gaz neutre, ladite canalisation forme une tuyère, dirigée dans le sens de l'écoulement de la poudre, ladite tuyère débouchant dans une seconde canalisation, sensiblement de même diamètre que la première, et en ce que l'arrivée de gaz neutre débouche à l'extrémité inférieure de la première canalisation, à l'extérieur de la tuyère, ledit gaz s'introduisant dans la seconde canalisation au moyen d'une pluralité d'orifices traversants ménagés sensiblement dans le même plan que l'extrémité inférieure de la tuyère, et orientés sensiblement parallèlement au sens d'écoulement de la poudre.This device for supplying powder under pressure to a bath of molten metal, comprising: “an enclosure, in which the powder is agitated and pressurized, enclosure at the lower end of which a pipe conveys the powder towards the molten metal bath; M an inlet for neutral gas, opening at the level of the pipe, and suitable for ensuring the progression of the powder towards said bath; is characterized in that at the neutral gas inlet, said pipe forms a nozzle, directed in the direction of flow of the powder, said nozzle opening into a second pipe, substantially of the same diameter as the first, and in that the arrival of neutral gas opens at the lower end of the first pipe, outside the nozzle, said gas entering the second pipe by means of a plurality of through orifices formed substantially in the same plane as the lower end of the nozzle, and oriented substantially parallel to the direction of flow of the powder.
Selon l'invention, les deux canalisations sont solidarisées l'une à l'autre au moyen de bagues. L'une des bagues est en outre munie de deux orifices latéraux, diamétralement répartis par rapport à sa génératrice, au niveau desquels aboutissent les arrivées de gaz neutre. Bien évidemment, le dispositif peut comporter plus que deux arrivées de gaz neutre, et dans cette hypothèse, la bague en question est munie d'autant d'orifices latéraux.According to the invention, the two pipes are secured to one another by means of rings. One of the rings is also provided with two lateral orifices, diametrically distributed with respect to its generator, at the level of which the inlets of neutral gas terminate. Obviously, the device may have more than two inlets of neutral gas, and in this case, the ring in question is provided with as many lateral orifices.
Par ailleurs, ladite bague comporte une cloison, orientée perpendiculairement par rapport au sens d'écoulement de la poudre, et percée d'une part, d'un orifice central, afin de permettre l'introduction à ce niveau de l'extrémité inférieure de la tuyère, et d'autre part, des orifices traversants, périphériques par rapport à l'orifice central, et orientés parallèlement audit sens d'écoulement, et destinés à permettre le passage du gaz sous pression en direction de la canalisation. Selon l'invention, ce dispositif est plus particulièrement destiné aux fonderies d'aluminium.Furthermore, said ring comprises a partition, oriented perpendicularly to the direction of flow of the powder, and pierced on the one hand, with a central orifice, in order to allow the introduction at this level of the lower end of the nozzle, and on the other hand, through orifices, peripheral with respect to the central orifice, and oriented parallel to said direction of flow, and intended to allow the passage of gas under pressure in the direction of the pipe. According to the invention, this device is more particularly intended for aluminum foundries.
La manière dont l'invention peut être réalisée et les avantages qui en découlent ressortiront mieux de l'exemple de réalisation qui suit, donné à titre indicatif et non limitatif à l'appui des figures annexées.The manner in which the invention can be implemented and the advantages which result therefrom will emerge more clearly from the example of embodiment which follows, given by way of nonlimiting indication in support of the appended figures.
La figure 1 est une vue latérale de l'installation conforme à l'invention. La figure 2 est une vue frontale de l'installation de la figure 1. La figure 3 est une vue en section longitudinale du dispositif conforme à l'invention. La figure 4 est une vue schématique représentant partiellement la bague de solidarisation de deux canalisations, conformément à l'invention. La figure 5 est une vue du dessous de ladite bague.Figure 1 is a side view of the installation according to the invention. Figure 2 is a front view of the installation of Figure 1. Figure 3 is a longitudinal sectional view of the device according to the invention. Figure 4 is a schematic view partially showing the securing ring of two pipes, according to the invention. Figure 5 is a bottom view of said ring.
L'invention est plus particulièrement décrite en relation avec un dispositif d'alimentation d'un bain de métal liquide en un matériau pulvérulent. Pour autant, elle ne saurait être limitée à cette seule application, et tout dispositif de transfert de matériau pulvérulent est également couvert par la présente invention.The invention is more particularly described in relation to a device for supplying a bath of liquid metal with a pulverulent material. However, it cannot be limited to this single application, and any device for transferring pulverulent material is also covered by the present invention.
On a représenté sur la figure 1, une vue latérale de l'installation conforme à l'invention. Celle-ci est fondamentalement constituée d'un châssis (1) monté sur roulettes (2) afin de permettre son déplacement, l'une ou plusieurs des roulettes étant munies d'un système de freinage, en vue de favoriser la stabilité de l'ensemble.There is shown in Figure 1, a side view of the installation according to the invention. This basically consists of a chassis (1) mounted on casters (2) to allow its movement, one or more of the rollers being provided with a braking system, in order to promote the stability of the together.
Ce châssis tabulaire ou métallique (1) reçoit une enceinte (3), en l'espèce de forme tronconique, au sein de laquelle est stockée la poudre de pH acide à incorporer dans le métal fondu, par exemple de l'aluminium.This tabular or metallic frame (1) receives an enclosure (3), in this case of frustoconical shape, within which is stored the acid pH powder to be incorporated in the molten metal, for example aluminum.
Cette poudre, non représentée, est agitée au moyen d'un agitateur (5) à pales, mu par un moteur électrique, également non représenté. Cette enceinte (3) est munie d'une trappe d'accès et de remplissage, positionnée sur sa face supérieure, et susceptible d'être obturée au moyen d'un couvercle étanche (4), afin de pouvoir maintenir la poudre sous pression. L'extrémité inférieure (7) de la cuve (3), de diamètre plus réduit, se prolonge par une première canalisation (8), de diamètre déterminé. Néanmoins, et avantageusement, on intercale entre l'extrémité inférieure (7) et la première canalisation (8) un distributeur alvéolaire (6), destiné à calibrer de manière connue et déterminée, la quantité de poudre à injecter dans le métal fondu. De tels distributeurs alvéolaires sont en eux- mêmes bien connus, de sorte qu'il n'y a pas Heu de les décrire ici plus en détail.This powder, not shown, is stirred by means of a paddle stirrer (5), driven by an electric motor, also not shown. This enclosure (3) is provided with an access and filling hatch, positioned on its upper face, and capable of being closed by means of a sealed cover (4), in order to be able to keep the powder under pressure. The lower end (7) of the tank (3), of smaller diameter, is extended by a first pipe (8), of determined diameter. Nevertheless, and advantageously, an alveolar distributor (6) is inserted between the lower end (7) and the first pipe (8), intended to calibrate in a known and determined manner, the quantity of powder to be injected into the molten metal. Such cellular distributors are in themselves well known, so there is no need to describe them here in more detail.
Ils sont constitués d'alvéoles, semi-cyHndriques, réalisés en l'espèce en polytétrafluoroéthylène (Téflon - Marque déposée), la quantité requise étant assurée par rapport à la chemise extérieure cylindrique en acier inoxydable. Ainsi, en fonction de la vitesse de rotation du distributeur alvéolaire (6), on aboutit à un dosage connu et reproductible de la poudre dans le métal fondu.They consist of semi-cylindrical cells, made in this case of polytetrafluoroethylene (Teflon - Registered trademark), the required quantity being provided relative to the cylindrical outer jacket of stainless steel. Thus, depending on the speed of rotation of the alveolar distributor (6), this results in a known and reproducible metering of the powder in the molten metal.
Ce distributeur alvéolaire (6) est avantageusement géré au moyen d'un automate programmable, dont on a représenté par la référence (11), l'armoire électrique.This alveolar distributor (6) is advantageously managed by means of a programmable automaton, the electrical cabinet of which is represented by the reference (11).
Selon une caractéristique de l'invention, et tel qu'on peut bien l'observer sur la figure 3, l'extrémité inférieure de la première canaHsation (8) se termine par une tuyère (12), dont la propre extrémité inférieure (13) aboutit dans une seconde canahsation (9), de diamètre identique ou sensiblement identique à celui de la canaHsation (8). Ces deux canalisations sont solidarisées l'une à l'autre au moyen de deux bagues (10, 22), ainsi qu'on peut bien l'observer sur la figure 3. Cette tuyère, ainsi que déjà dit, permet d'augmenter la vitesse d'écoulement de la poudre à ce niveau, et partant dans la canaHsation (9).According to a characteristic of the invention, and as can be seen in FIG. 3, the lower end of the first pipe (8) ends in a nozzle (12), the own lower end of which (13 ) ends in a second canahsation (9), of identical or substantially identical diameter to that of the canaHsation (8). These two pipes are secured to one another by means of two rings (10, 22), as can be seen in Figure 3. This nozzle, as already said, increases the speed of flow of the powder at this level, and leaving in the pipe (9).
ParaUèlement, aboutissent au niveau de la bague (10) deux canaHsations (14) et (15) d'arrivée de gaz neutre, notamment d'argon, sous pression déterminée. A cet effet, la bague (10) est munie de deux orifices latéraux, diamétralement répartis par rapport à sa génératrice, au niveau desquels aboutissent les canaHsations de gaz neutre (14, 15).Paraluously, end at the level of the ring (10) two pipes (14) and (15) of arrival of neutral gas, in particular argon, under determined pressure. For this purpose, the ring (10) is provided with two lateral orifices, diametrically distributed with respect to its generator, at the level of which the neutral gas pipes (14, 15) terminate.
La pression est en fait dépendante du débit, celui-ci étant géré au moyen de vannes de débit variable (connu sous la dénomination SMC), pilotées en 0 - 10 volts par l'automate programmable (11). Comme on peut l'observer sur la figuré 3, le gaz arrive au niveau de la bague (10) à l'extérieur de la tuyère (12), et est introduit au niveau de la canaHsation (9) sensiblement au même niveau que l'extrémité inférieure (13) de la tuyère. Pour ce faire, la bague (10) est pourvue d'une cloison (19) perpendiculaire au sens d'écoulement de la poudre, percée d'une part, d'un orifice central (23), afin de permettre l'introduction à ce niveau de l'extrémité inférieure (13) de la tuyère (12), et d'autre part, d'orifices traversants périphériques (20), orientés parallèlement audit sens d'écoulement, et destinés à permettre le passage du gaz sous pression en direction de la canaHsation (9).The pressure is in fact dependent on the flow rate, this being managed by means of variable flow valves (known under the name SMC), controlled in 0-10 volts by the programmable controller (11). As can be seen in FIG. 3, the gas arrives at the level of the ring (10) outside the nozzle (12), and is introduced at the level of the pipe (9) substantially at the same level as the 'lower end (13) of the nozzle. To do this, the ring (10) is provided with a partition (19) perpendicular to the direction of flow of the powder, pierced on the one hand, with a central opening (23), in order to allow the introduction at this level of the lower end (13) of the nozzle (12), and on the other hand, peripheral through orifices (20), oriented parallel to said direction of flow, and intended to allow the passage of gas under pressure in the direction of the pipeline (9).
On a représenté, sur la figure 5, une vue du dessous de ladite bague (10), dans lequel six de ces orifices (20) ont été représentés. Bien évidemment, le nombre indiqué est purement exemplatif et nullement limitatif.FIG. 5 shows a view from below of said ring (10), in which six of these orifices (20) have been represented. Obviously, the number indicated is purely illustrative and in no way limitative.
La canaHsation (9) est fixée à la canaHsation (8) par le biais d'une bague (22) rapportée sur la bague (10) au moyen de vis insérées dans des orifices taraudés ou filetés (21), ménagés au sein de la bague (10).The pipe (9) is fixed to the pipe (8) by means of a ring (22) attached to the ring (10) by means of screws inserted in threaded or threaded orifices (21) formed within the ring (10).
Parallèlement, des joints toriques ou à lèvre (16), (17) et (18) sont is en place afin d'assurer l'étancheité, notamment vis à vis du gaz neutre, et donc de l'ensemble de l'installation.At the same time, O-rings or lip seals (16), (17) and (18) are in place in order to ensure watertightness, in particular with respect to the neutral gas, and therefore of the entire installation.
L'expérience démontre que, de par l'orientation particulière du flux gazeux, et la mise en place de cette tuyère, on aboutit à une progression beaucoup plus aisée de la poudre au sein de la canalisation, et partant, à un cahbrage plus précis lors de son introduction dans le métal fondu.Experience shows that, by the particular orientation of the gas flow, and the installation of this nozzle, it results in a much easier progression of the powder within the pipe, and therefore, to a more precise cahbrage. when introduced into the molten metal.
Par auteurs, on a également pu montrer que ce dispositif particulier s'avérait tout particuhèrement adapté au transfert de matériaux pulvérulents, susceptibles de se présenter selon une granulométrie variée. By authors, we have also been able to show that this particular device turned out to be particularly suitable for the transfer of pulverulent materials, capable of being presented according to a varied particle size.

Claims

REVENDICATIONS
1. Dispositif pour le transfert de matériaux pulvérulents, comprenant :1. Device for the transfer of pulverulent materials, comprising:
• une enceinte (3), dans laqueUe le matériau pulvérulent à transférer est agité et mis sous pression, enceinte à l'extrémité inférieure (7) de laquelle une canaHsation (8) achemine ledit matériau en direction de son Heu de destination ; i une arrivée de gaz (14, 15), et notamment d'air comprimé, débouchant au niveau de la canalisation (8), et propre à assurer la progression du matériau vers ledit Heu ; caractérisé en ce qu'au niveau de l'arrivée de gaz (14, 15), ladite canalisation (8) forme une tuyère (12), dirigée dans le sens de l'écoulement du matériau, ladite tuyère débouchant dans une seconde canaHsation (9), sensiblement de même diamètre que la première, et en ce que l'arrivée de gaz (14, 15) débouche à l'extrémité inférieure de la première canalisation, à l'extérieur de la tuyère (12), ledit gaz s'introduisant dans la seconde canalisation (9) au moyen d'une pluraHté d'orifices traversants (20) ménagés sensiblement dans le même plan que l'extrémité inférieure (13) de la tuyère (12), et orientés sensiblement parallèlement au sens d'écoulement du matériau pulvérulent.• an enclosure (3), in which the pulverulent material to be transferred is agitated and pressurized, enclosure at the lower end (7) from which a pipe (8) conveys said material in the direction of its destination; i a gas inlet (14, 15), and in particular of compressed air, opening at the level of the pipe (8), and suitable for ensuring the progression of the material towards said er; characterized in that at the gas inlet (14, 15), said pipe (8) forms a nozzle (12), directed in the direction of flow of the material, said nozzle opening into a second pipe ( 9), substantially the same diameter as the first, and in that the gas inlet (14, 15) opens at the lower end of the first pipe, outside the nozzle (12), said gas s 'introducing into the second pipe (9) by means of a plurality of through orifices (20) formed substantially in the same plane as the lower end (13) of the nozzle (12), and oriented substantially parallel to the direction d flow of the pulverulent material.
2. Dispositif de transfert de matériaux pulvérulents selon la revendication 1, caractérisé en ce qu'il comporte deux arrivées de gaz (14, 15), réparties de manière diamétrale par rapport à la canalisation (8).2. Device for transferring pulverulent materials according to claim 1, characterized in that it comprises two gas inlets (14, 15), distributed diametrically relative to the pipe (8).
3. Dispositif de transfert de matériaux pulvérulents selon l'une des revendications 1 et 2, caractérisé en ce que les deux canaHsations (8, 9) sont soHdarisées l'une à l'autre au moyen de bagues (10, 22).3. Device for transferring pulverulent materials according to one of claims 1 and 2, characterized in that the two pipes (8, 9) are soHdarized to each other by means of rings (10, 22).
4. Dispositif de transfert de matériaux pulvérulents selon la revendication 3, caractérisé en ce que la bague (10) est munie de deux orifices latéraux, diamétralement répartis par rapport à sa génératrice, au niveau desquels aboutissent les arrivées de gaz (14, 15).4. Device for transferring pulverulent materials according to claim 3, characterized in that the ring (10) is provided with two lateral orifices, diametrically distributed with respect to its generator, at the level of which the gas inlets (14, 15) terminate. .
5. Dispositif de transfert de matériaux pulvérulents selon l'une des revendications 3 et 4, caractérisé en ce que la bague (10) comporte une cloison (19), orientée perpendiculairement par rapport au sens d'écoulement des matériaux pulvérulents, et percée d'une part, d'un orifice central (23), afin de permettre l'introduction à ce niveau de l'extrémité inférieure (13) de la tuyère (12), et d'autre part, des orifices traversants (20), périphériques par rapport à l'orifice central (23), et orientés parallèlement audit sens d'écoulement, et destinés à permettre le passage du gaz sous pression en direction de la canaHsation (9).5. Device for transferring pulverulent materials according to one of claims 3 and 4, characterized in that the ring (10) comprises a partition (19), oriented perpendicularly to the direction of flow of the pulverulent materials, and pierced d firstly, a central opening (23), in order to allow the introduction at this level of the lower end (13) of the nozzle (12), and on the other hand, through orifices (20), peripheral relative to the central orifice (23), and oriented parallel to said direction of flow, and intended to allow the passage of gas under pressure in the direction of the pipeline (9).
6. Dispositif de transfert de matériaux pulvérulents selon l'une des revendications 1 à 5, caractérisé en ce qu'il comporte, entre l' extrémité inférieure (7) de l'enceinte (3) et la bague (10) un distributeur alvéolaire (6), destiné à délivrer des quantités calibrées et définies desdits matériaux.6. Device for transferring pulverulent materials according to one of claims 1 to 5, characterized in that it comprises, between the lower end (7) of the enclosure (3) and the ring (10) a honeycomb distributor (6), intended to deliver calibrated and defined quantities of said materials.
7. Dispositif de transfert de matériaux pulvérulents selon l'une des revendications 1 à 6, caractérisé en ce qu'il est géré par un automate programmable.7. Device for transferring pulverulent materials according to one of claims 1 to 6, characterized in that it is managed by a programmable controller.
8. Dispositif d'alimentation en poudre sous pression d'un bain de métal fondu, comprenant :8. Device for feeding powder under pressure to a molten metal bath, comprising:
M une enceinte (3), dans laquelle la poudre est agitée et mise sous pression, enceinte à l'extrémité inférieure (7) de laquelle une canalisation (8) achemine la poudre en direction du bain de métal fondu ; • une arrivée de gaz neutre, débouchant au niveau de la canaHsation (8), et propre à assurer la progression de la poudre vers ledit bain ; caractérisé en ce qu'au niveau de l'arrivée de gaz neutre, ladite canaHsation (8) forme une tuyère (12), dirigée dans le sens de l'écoulement de la poudre, ladite tuyère (12) débouchant dans une seconde canaHsation (9), sensiblement de même diamètre que la première, et en ce que l'arrivée (14, 15) de gaz neutre débouche à l'extrémité inférieure de la première canalisation (8), à l'extérieur de la tuyère (12), ledit gaz s'introduisant dans la seconde canalisation (9) au moyen d'une pluralité d'orifices traversants (20) ménagés sensiblement dans le même plan que l'extrémité inférieure (13) de la tuyère (12), et orientés sensiblement parallèlement au sens d'écoulement de la poudre;M an enclosure (3), in which the powder is agitated and pressurized, enclosure at the lower end (7) from which a pipe (8) conveys the powder in the direction of the molten metal bath; • an inlet of neutral gas, opening at the level of the pipe (8), and suitable for ensuring the progression of the powder towards said bath; characterized in that at the neutral gas inlet, said pipe (8) forms a nozzle (12), directed in the direction of flow of the powder, said nozzle (12) opening into a second pipe ( 9), substantially the same diameter as the first, and in that the inlet (14, 15) of neutral gas opens at the lower end of the first pipe (8), outside the nozzle (12) , said gas entering the second pipe (9) by means of a plurality of through orifices (20) formed substantially in the same plane as the lower end (13) of the nozzle (12), and oriented substantially parallel to the direction of flow of the powder;
9. Dispositif d' alimentation en poudre sous pression d'un bain de métal fondu selon la revendication 8, caractérisé en ce qu'il comporte "deux arrivées de gaz (14, 5), réparties de manière diamétrale par rapport à la canaHsation. 9. Device for feeding powder under pressure to a molten metal bath according to claim 8, characterized in that it comprises " two gas inlets (14, 5), distributed diametrically with respect to the pipeline.
10. Dispositif d'alimentation en poudre sous pression d'un bain de métal fondu selon l'une des revendications 8 et 9, caractérisé en ce que les deux canaHsations (8, 9) sont solidarisées l'une à l'autre au moyen de bagues (10, 22).10. Device for supplying powder under pressure to a molten metal bath according to one of claims 8 and 9, characterized in that the two pipes (8, 9) are secured to each other by means rings (10, 22).
11. Dispositif d'aHmentation en poudre sous pression d'un bain de métal fondu selon la revendication 10, caractérisé en ce que la bague (10) est munie de deux orifices latéraux, diamétralement répartis par rapport à sa génératrice, au niveau desquels aboutissent les arrivées de gaz neutre (14, 15).11. Device for aHmentation in powder under pressure of a molten metal bath according to claim 10, characterized in that the ring (10) is provided with two lateral orifices, diametrically distributed relative to its generatrix, at the level of which end the neutral gas inlets (14, 15).
12. Dispositif d'alimentation en poudre sous pression d'un bain de métal fondu selon l'une des revendications 10 et 11, caractérisé en ce que la bague (10) comporte une cloison (19), orientée perpendiculairement par rapport au sens d'écoulement de la poudre, et percée d'une part, d'un orifice central (23), afin de permettre l'introduction à ce niveau de l'extrémité inférieure (13) de la tuyère (12), et d'autre part, des orifices traversants (20), périphériques par rapport à l'orifice central (23), et orientés parallèlement audit sens d'écoulement, et destinés à permettre le passage du gaz sous pression en direction de la canalisation (9).12. Device for supplying powder under pressure to a molten metal bath according to one of claims 10 and 11, characterized in that the ring (10) comprises a partition (19), oriented perpendicularly to the direction d flow of the powder, and pierced on the one hand, with a central orifice (23), in order to allow the introduction at this level of the lower end (13) of the nozzle (12), and on the other part, through orifices (20), peripheral with respect to the central orifice (23), and oriented parallel to said direction of flow, and intended to allow the passage of gas under pressure in the direction of the pipe (9).
13. Dispositif d'aHmentation en poudre sous pression d'un bain de métal fondu selon l'une des revendications 8 à 12, caractérisé en ce qu'il est plus particulièrement destiné aux fonderies d'aluminium.13. Device for aHmentation in powder under pressure of a molten metal bath according to one of claims 8 to 12, characterized in that it is more particularly intended for aluminum foundries.
14. Dispositif d'alimentation en poudre sous pression d'un bain de métal fondu selon l'une des revendications 8 à 13, caractérisé en ce qu'il comporte, entre l'extrémité inférieure (7) de l'enceinte (3) et la bague (10) un distributeur alvéolaire (6), destiné à déhvrer des quantités caHbrées et définies de poudre au niveau du bain de métal fondu.14. Device for supplying powder under pressure to a molten metal bath according to one of claims 8 to 13, characterized in that it comprises, between the lower end (7) of the enclosure (3) and the ring (10) a honeycomb distributor (6), intended to unhide defined and defined quantities of powder at the level of the molten metal bath.
15. Dispositif d'alimentation en poudre sous pression d'un bain de métal fondu selon l'une des revendications 8 à 14, caractérisé en ce qu'il est géré par un automate programmable. 15. Device for feeding powder under pressure to a molten metal bath according to one of claims 8 to 14, characterized in that it is managed by a programmable controller.
EP01983649A 2000-11-03 2001-10-29 Device for transferring powdery materials, and use for feeding a melting metal with powdery material Withdrawn EP1330402A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0014100A FR2816298B1 (en) 2000-11-03 2000-11-03 DEVICE FOR TRANSFERRING POWDER MATERIALS AND APPLICATION TO SUPPLY A MOLTEN METAL WITH POWDER MATERIAL
FR0014100 2000-11-03
PCT/FR2001/003361 WO2002036468A1 (en) 2000-11-03 2001-10-29 Device for transferring powdery materials, and use for feeding a melting metal with powdery material

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JP2004513044A (en) 2004-04-30
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US20020172566A1 (en) 2002-11-21
FR2816298A1 (en) 2002-05-10
CA2394661A1 (en) 2002-05-10
US6632049B2 (en) 2003-10-14
NZ519681A (en) 2003-08-29
FR2816298B1 (en) 2003-03-07

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