EP0139598B1 - Dosing-feeding device for pulverulent products - Google Patents

Dosing-feeding device for pulverulent products Download PDF

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Publication number
EP0139598B1
EP0139598B1 EP84420114A EP84420114A EP0139598B1 EP 0139598 B1 EP0139598 B1 EP 0139598B1 EP 84420114 A EP84420114 A EP 84420114A EP 84420114 A EP84420114 A EP 84420114A EP 0139598 B1 EP0139598 B1 EP 0139598B1
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EP
European Patent Office
Prior art keywords
chamber
discharging
spoon
filling
bowl
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
Application number
EP84420114A
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German (de)
French (fr)
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EP0139598A1 (en
Inventor
Roger Le Molaire
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.)
Ateliers Durand Et Le Molaire A Responsabilite Ltee Ste
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Ateliers Durand Et Le Molaire A Responsabilite Ltee Ste
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Publication of EP0139598A1 publication Critical patent/EP0139598A1/en
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Publication of EP0139598B1 publication Critical patent/EP0139598B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B33/00—Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor
    • F42B33/02—Filling cartridges, missiles, or fuzes; Inserting propellant or explosive charges
    • F42B33/0285—Measuring explosive-charge levels in containers or cartridge cases; Methods or devices for controlling the quantity of material fed or filled
    • F42B33/0292—Measuring explosive-charge levels in containers or cartridge cases; Methods or devices for controlling the quantity of material fed or filled by volumetric measurement, i.e. the volume of the material being determined before filling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/30—Devices or methods for controlling or determining the quantity or quality or the material fed or filled
    • B65B1/36—Devices or methods for controlling or determining the quantity or quality or the material fed or filled by volumetric devices or methods

Definitions

  • the present invention relates to a device intended to allow the metering and dispensing, repeatedly, of any pulverulent product to be packaged in a container with a single or multiple load.
  • the invention relates, more particularly, to a metering-dispensing device capable of fulfilling the above function in a packaging machine with repetitive automatic operation, that is to say designed to ensure automatic loading, in large series, of containers presented successively at at least one loading station.
  • the object of the invention relates, more particularly, to the technical field of packaging powders inside cases or sockets intended to form cartridges of an explosive nature.
  • Such a device does not make it possible to provide a constant service, since the metered product is subjected, during the passage through the template, to a compression stress introducing dosage variations which are all the more important the lower the initial dose.
  • the forced introduction of the filled drawer into the template may be responsible for the compression, friction or elevation in temperature of particles constrained between the relatively sliding walls. This may result in a risk of ignition or sudden explosion in the case of dosing-distribution of flammable or explosive powder.
  • the invention aims to remedy the various drawbacks above by proposing a new metering-dispensing device which can be used for any pulverulent product, but offering safety and security characteristics which are particularly suitable for the transfer of pulverulent products having a flammable nature. or explosive.
  • An additional object of the invention is to provide a new metering and dispensing device whose particular design is chosen to relatively isolate the various storage, metering, distribution and / or transfer volumes, in order to offer means capable of object to the spread of a fire or explosion, if applicable unexpectedly occurring at any one of the stages of transfer of the powdered product, whether metered or not.
  • Another object of the invention is to propose a new metering and dispensing device constituting a compact unit which can be easily adapted or dismantled from a work station of a transfer machine when it is necessary to adapt, on the latter, a device whose dosing and distribution characteristics must be related to the useful volume offered by the container to be loaded.
  • Fig. 1 is a sectional elevation, partially cut away, of the metering-dispensing device.
  • Fig. 2 is a transverse view, partly in section, taken along line II-II of FIG. 1.
  • Fig. 3 is a side view, partially broken away, taken along line III-III of FIG. 2.
  • Fig. 4 is a top view taken along line IV-IV of FIG. 1.
  • Figs. 5 and 6 are partial sections taken, respectively, along the lines V-V and VI-VI of FIG. 1.
  • Fig. 7 is a partial cross-section taken, on a larger scale, along the line VII-VII of FIG. 1.
  • the metering-dispensing device for powdery product comprises a support and fixing body 1 intended to be adapted, by any suitable means, to the plate 2 of a work station provided for filling, filling, loading of a container, such as 3.
  • Fig. 1 shows, to facilitate understanding of the following, an example of application in which the container 3 is constituted by a case or a socket intended to receive one or more charges of pulverulent product whose subsequent final packaging is completed by laying a cover, not illustrated in the drawings.
  • the container 3 can be, for example, carried by a transfer device 4 forming part of the movable member 5 of a transfer machine with automatic operation.
  • the support and fixing body 1 is preferably constituted by two half-bodies 1a and 1b (FIG. 2) which are assembled side by side by means of screws 6. Any other embodiment could be envisaged and , in particular, it could be chosen to make the body 1 in one piece by molding or casting.
  • the body 1 is made to delimit, from the open upper surface, a filling chamber 7 and an emptying chamber 8.
  • the filling chamber 7 has a generally cylindrical conformation of horizontal axis, the section of this chamber possibly having , as shown in fig. 2, a gradual axial reduction towards the periphery.
  • the filling chamber 7 communicates with a drain pipe 9 being established between the bottom of the chamber and the base of the body 1.
  • the drain pipe 9 is closed, in operating condition, by a plug 10.
  • the filling chamber 7 is in relation to an intercommunication conduit 11, in a tangential direction, rising from the chamber 7 to the lower part of a base 12 removably attached to the upper part of the body 1.
  • the base 12 defines a cavity 13 in the form of a truncated cone or inverted pyramid trunk whose small base is placed substantially in the plane of the open upper edge.
  • the base 12 is reserved for the adaptation of a hopper 14 for supplying the chamber 7 with powdery product.
  • the hopper 14 has a flange 15 which is established in the plane of the small open base, the cross section of which is smaller, for reasons which appear below, than that of the large base of the cavity 13.
  • the hopper 14 is associated to a level detector 16 comprising a balance 17 provided with a pallet 18 inside the hopper 14.
  • the balance 17 is pivotally mounted on a hinge pin 19 which is carried by the hopper 14.
  • the balance 17 is extended beyond the axis 19 and carries a balancing counterweight 20.
  • the axis 19 is preferably carried by a support 21 adapted on the hopper 14 and designed to allow the mounting of a contactor 22 capable of be actuated by the balance 17 and, in this case, more particularly, by the counterweight 20.
  • the hopper 14 is preferably also associated with a stirring member 14a whose intermittent rotation makes it possible to oppose the effect of possible vault of the pulverulent product.
  • the emptying chamber 8 has a conformation of the inverted trunk-pyramidal type. This chamber is delimited, so as to form with the chamber 7 a directional alignment perpendicular to the geometric axis of the chamber 7.
  • the emptying chamber 8 has, between its inclined faces, a small inclination angle, so that the latter constitute smooth surfaces of abrupt character close to vertical, for reasons that appear in the following.
  • the chambers 7 and 8 are thus separated from each other by an edge 1, formed by the material constituting the body 1 and rising above a fictitious horizontal plane which would pass through the bottom of the filling 7.
  • the body 1 supports a rotary dispenser, of the spoon type, designated as a whole by the reference 23.
  • the rotary doser comprises a carriage 24 (fig. 3 and 4) which is mounted and guided with impossibility of rotation on a slide 25 attached outside the body 1.
  • the carriage 24 supports, at its upper part, a jack 26 of the rotary type with two directions of rotation whose angular range of rotation can be limited.
  • the output shaft 27 of the jack 26 carries a hub 28 on which can be fixed, in a removable manner, the arm 29 of a metering spoon 30.
  • the shaft 27 passes through a clearance 31 presented by the corresponding wall of the body 1
  • the shaft 27 thus extends inside the chamber 7, preferably being coincident with the geometrical axis of the latter, in a corresponding stable stop position, as illustrated in FIG. 1, in a filling state.
  • the arm 29 is mounted on the shaft 27 so as to be located, preferably, in the median plane of the chamber 7.
  • the length of the arm 29 is determined, so that the spoon 30 is not brought into contact with the peripheral wall defining the chamber 7.
  • the hub 28 and the actuator 26 are chosen so that, in the stable stop position of the latter, the spoon 30 is arranged in a substantially vertical orientation, below a leveling device 32 carried by the body 1 to extend inside the chamber 7.
  • the device 32 comprises a bar 33 which is held by a clamp 34, so as to have a horizontal lower edge facing the upper open section of the spoon 30 ,
  • the clamp 34 is fixed to the upper part of a rod 34a guided outside the body 1 in a slide 34b for clamping and axial immobilization.
  • the slide 34b is supported by its base on a button 34c extended by a screw 34d screwed into the body 1.
  • the operation of the button 34c makes it possible to modify the vertical position of the bar 33 and to adjust the latter to the leveling plane. This setting is then maintained stably and precisely by tightening the slide 34b.
  • the carriage 24 is connected by an end plate 35 to the rod 36 of a jack 37, mounted by a nose flange 38 on the body 1, to extend outwardly to the latter and parallel to the slide 25.
  • the cylinder 37 is associated with two adjustable limit switches 39 and 40, determining the useful stroke of extension-retraction of the rod 36 and, consequently, the reciprocating displacement imposed on the axis 27. This stroke is determined in relation with the length of the clearance 31 formed in the body 1 from the chamber 7 to extend, at least in part also, into the emptying chamber 8.
  • the body 1 supports, at its lower part, an alternative mobile distributor 41 responsible for ensuring the transfer between the emptying chamber 8 and a filling funnel 42 carried, directly or indirectly, by the body 1 or its support member.
  • the funnel 42 is associated with a vertical movement control back and forth, in order to be able to be brought into sealed support on the upper part of the station containing 3.
  • the distributor 41 can be placed in direct relation with the small base. open lower part of the chamber 8 or with that of a transfer adapter 43 attached under the lower face of the body 1.
  • the adapter 43 delimits a passage 44 of generally frustoconical inverted shape, establishing the flow transition by gravity between the chamber 8 and the distributor.
  • the passage 44 has a large base with a larger cross section than that of the lower open chamber 8.
  • the dispenser 41 comprises a console 45 suspended from the lower part of the body 1 for fixing and guiding the movable constituent elements of the dispenser 41.
  • the console 45 comprises a crosspiece 46 supporting (fig. 5) the nose of a cylinder 47 of the double-acting type.
  • the piston rod 48 of the actuator 47 carries a carriage 49 guided by cylindrical rods 50 in rings 51 of the cross member 46.
  • the ends of the rods directed towards the body of the actuator 47 carry stops 50a intended to cooperate with the cross member 46.
  • the carriage 49 carries, opposite the cylinder 47, a bucket 52 defining a receiving capacity 53 of a load of powdery product.
  • the capacity 53 is limited by two vertical walls, an inclined wall and by a pivoting flap 54 defining the front wall of the bucket, in consideration of the direction of movement corresponding to the filling of a container 3.
  • the flap 54 is pivotally mounted by an axis horizontal 55 (fig. 7) on the upper part of the cup 52.
  • the flap 54 is associated with a mechanism 56 for automatic opening and closing control.
  • the mechanism 56 comprises, as appears in FIG. 6, a rod 57 mounted in guides 58 carried respectively by the body 1 and the console 45.
  • the rod 57 is associated with a stop 59 intended to cause a positive opening command, as will appear in the following.
  • the rod 57 is also associated with an elastic member 60, for example of the helical type, working under compression, threaded concentrically on the rod to be placed between one of the guides 58 and, for example, an abutment shoulder presented by the rod.
  • the carriage 49 includes a cover 61 extending in the direction of the console 45, so as to cover the guide rods 50 and the piston rod 48 when the bucket 52 is brought into a load-shedding position in relation to the transfer funnel 42.
  • the cylinder 37a was supplied to cause the extension of the piston rod 36 bringing the carriage 24 into the position where the spoon 30 is placed in relation to the volume of the chamber 8.
  • the rotary actuator 26 has been supplied so that, by rotation of the shaft 27, the open section of the spoon 30 is directed towards the small base of the emptying chamber 8.
  • the operation of the device implies that it is loaded with pulverulent product introduced into the feed hopper 14 which ensures, by gravity, via the base 12 and the intercommunication conduit 11, the filling of the chamber 7.
  • the jack 37 is supplied to cause the retraction stroke of the rod 36 bringing the carriage 24 into the position where the axis 27 of the rotary jack 26 is placed in coincidence with the geometric axis of the chamber 7.
  • This position can be determined by means of the contactor 40 also controlling, for example, the subsequent operation of the rotary actuator 26 supplied to cause the rotation of the shaft 27 in the direction of the arrow f 2 (fig. 1).
  • the spoon 30 is thus brought to traverse an angular path inside the chamber 7 which has the effect of ensuring its natural filling by relative displacement relative to the pulverulent material filling the chamber 7.
  • the rotation of the shaft 27 is controlled by the actuator 26 until the spoon 30 is brought into the position shown in solid lines in FIG. 1.
  • the spoon 30 is brought back into the volume of the emptying chamber 8, while occupying, inside the latter, the same position as that imparted inside the chamber 7.
  • the upper orifice of the spoon 30 passes under the bar 33 which realizes a leveling without compression of the dose of pulverulent product taken up by the spoon 30.
  • This dose of product is thus strictly limited to the useful volume offered and filled with the spoon 30.
  • the fraction of excess product is poured onto the mass of product occupying the chamber 7 and does not lead to any pollution of the environment.
  • the part 35 controls the contactor 39 responsible for reversing the supply of the rotary actuator 26.
  • the shaft 27 is thus rotated in the opposite direction to that of the arrow f 2 and brings the spoon 30 in the original position shown in phantom in FIG. 1.
  • This movement of reverse angular displacement of the spoon 30 causes the emptying of the dose of powdered product inside the chamber 8 where this dose can flow by gravity, in a substantially direct manner, taking into account the geometric conformation conferred on chamber 8.
  • the inclined walls of chamber 8 are precisely defined so as to reduce as much as possible any retention of particles of pulverulent product, while driving the dose delivered and emptied in the direction of receiving capacity 53 of bucket 52.
  • the dose of product is received in the closed capacity 53 and can be maintained in the latter as long as the general operating cycle, subject to the presentation of a container 3 in the desired loading or filling position, has not been triggered by validating this presence.
  • the jack 47 is supplied with power to cause the extension stroke of the rod 48 leading the bucket 52, from its loading position, to the load shedding position in which it is, at less in part, engaged directly above the funnel 42, as shown in FIG. 1.
  • the shedding of the dose of product occupying the capacity 53 also occurs by the shock action resulting from the coming into contact of the stop 59 with the guide 58, shock action transmitted by the structure. constitutive of the distributor 41 up to the cup 52.
  • This load shedding is also established in a second step by the coming into contact of the stops 50a with the console 46 producing a shock wave favoring the separation of the particles from the walls.
  • the unloading of the dose of pulverulent product is carried out in full as a result of the conformation of the capacity 53 delimited by vertical or strongly inclined surfaces which are, moreover executed so as to present a polished surface state, as well as the constituent walls of chamber 8 and passage 44.
  • the carriage 49 can actuate, by a finger 62, a limit switch 63 responsible for reversing the power supply to the jack 47.
  • the rod 48 performs its stroke of retraction by driving, in the opposite direction to that of arrow f 4 , the bucket 42 towards the original position directly above the emptying chamber 8.
  • the stop 59 leaves the guide 58, so that the spring 60 controls the return to the automatic closed position of the flap 54.
  • the metering-dispensing device represents a compact assembly which can be easily mounted or dismounted on a work station by adaptation on a plate or plate 2, in order to extend into the door -overhang and overhanging a work or transfer area along which there are successive containers 3 to receive the same dose of powdered product.
  • the device is designed in such a way that the various capacities, chambers or cavities for receiving or temporarily storing a dose of products are sufficiently isolated from each other during the operating cycle, to avoid any propagation of fire or 'explosion.
  • the edge 1 1 has a conformation chosen to avoid that a possible retention of powdered product towards the base of the chamber 8 can be the propagation of an inflammation or an explosion propagating to the load of powdery product. occupying room 7.
  • the cover 61 assumes a firewall function in the load shedding position of the bucket 52 and is opposed to any upward propagation from the funnel 42 towards the chamber 7.
  • the shutter 54 also assumes the same function of firewall in the direction of the dose of powder poured into the capacity 53 placed directly above the chamber 8.
  • the operation of the metering-dispensing device can be repeated automatically, as long as the hopper 14 contains a quantity of pulverulent product sufficient to ensure the automatic supply of the chamber 7. As soon as this quantity drops below a value determined by the setting of the detector 16, the contactor 22 ensures the operation of a reminder lamp for manual reloading of the hopper 14 or of an automatic make-up circuit.
  • Fig. 7 shows a detector for the passage of powdery product at the base of the chamber 8.
  • This detector comprises a pendulum 65, mounted on an axis 66 carried by the body 1.
  • the pendulum comprises a pallet 67 at its end permanently placed in the chamber 8 after passing through a window 71 formed in the wall of the body 1.
  • the end of the balance opposite the pallet can be provided with a balancing counterweight 68.
  • This end cooperates with a passage detector 69, of any suitable type , mounted in a housing 70 sealingly attached to the body 1.
  • the detector 69 is constituted by a fluid system emitting a jet of pressurized fluid towards a sensor facing which is placed the end of the balance in a stable state, as illustrated in strong lines.
  • Each dose of product dispensed influences the balance which passes into the temporary position shown in phantom.
  • the operation of the detector 69 makes it possible to consider that the spoon 30 has indeed delivered a dose of product. On the contrary, the absence of a functional finding in a given time interval provides an indication of a malfunction of the metering device 23.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Basic Packing Technique (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)

Description

La présente invention concerne un dispositif destiné à permettre le dosage et la distribution, de façon répétitive, d'un produit pulvérulent quelconque devant être conditionné dans un contenant à charge simple ou multiple.The present invention relates to a device intended to allow the metering and dispensing, repeatedly, of any pulverulent product to be packaged in a container with a single or multiple load.

L'invention vise, plus particulièrement, un dispositif doseur-distributeur apte à remplir la fonction ci-dessus dans une machine de conditionnement à fonctionnement automatique répétitif, c'est-à-dire conçue pour assurer le chargement automatique, en grande série, de contenants se présentant successivement à au moins un poste de chargement.The invention relates, more particularly, to a metering-dispensing device capable of fulfilling the above function in a packaging machine with repetitive automatic operation, that is to say designed to ensure automatic loading, in large series, of containers presented successively at at least one loading station.

L'objet de l'invention vise, plus particulièrement, le domaine technique du conditionnement de poudres à l'intérieur d'étuis ou douilles destinées à former des cartouches à caractère explosif.The object of the invention relates, more particularly, to the technical field of packaging powders inside cases or sockets intended to form cartridges of an explosive nature.

Pour assumer la fonction ci-dessus, on a déjà proposé un certain nombre de dispositifs faisant intervenir, en général, un principe de suremplissage consistant à déverser, dans le contenant, une charge de produit pulvérulent supérieure au volume utile offert. Une telle opération est ensuite suivie d'un arasement de la quantité excédentaire, afin de limiter la charge de produit au plan passant par l'orifice supérieur ouvert.To assume the above function, a number of devices have already been proposed which, in general, involve a principle of overfilling consisting in pouring into the container a load of powdered product greater than the useful volume offered. Such an operation is then followed by leveling off the excess quantity, in order to limit the product load on the plane passing through the open upper orifice.

Une telle façon de procéder n'est pas satisfaisante, car elle conduit à polluer sérieusement l'environnement avec le produit excédentaire arasé qu'il est difficile de récupérer automatiquement de façon complète.Such a procedure is not satisfactory, since it leads to serious pollution of the environment with the leveled surplus product which it is difficult to automatically recover completely.

Pour tenter de remédier a cet inconvénient, on a proposé, comme dans le brevet US 3 179 304, de doser, préalablement, le produit, notamment au moyen d'un doseur à tiroir comprenant une ou plusieurs capacités mises en relation avec un moyen de remplissage. Le ou les tiroirs sont déplaces relativement par rapport à un calibre destiné à égaliser le chargement du volume utile et à éliminer le produit pulvérulent excédentaire. Le tiroir chargé est ensuite déversé dans le contenant.In an attempt to remedy this drawback, it has been proposed, as in US Pat. No. 3,179,304, to dose the product beforehand, in particular by means of a drawer doser comprising one or more capacities put in relation with a means of filling. The drawer (s) are moved relatively with respect to a gauge intended to equalize the loading of the useful volume and to eliminate the excess pulverulent product. The loaded drawer is then poured into the container.

Un tel dispositif ne permet pas de fournir un service constant, car le produit dosé est soumis, lors du passage dans le gabarit, à une contrainte de compression introduisant des variations de dosage qui sont d'autant plus importantes que la dose initiale est faible.Such a device does not make it possible to provide a constant service, since the metered product is subjected, during the passage through the template, to a compression stress introducing dosage variations which are all the more important the lower the initial dose.

Par ailleurs, l'introduction forcée du tiroir rempli dans le gabarit-calibre peut être responsable de la compression, du frottement ou de l'élévation en température de particules contraintes entre les parois coulissant relativement. Il peut en résulter un risque d'inflammation ou d'explosion subite dans le cas de dosage-distribution de poudre à caractère inflammable ou explosif.Furthermore, the forced introduction of the filled drawer into the template may be responsible for the compression, friction or elevation in temperature of particles constrained between the relatively sliding walls. This may result in a risk of ignition or sudden explosion in the case of dosing-distribution of flammable or explosive powder.

Un autre inconvémient de la solution ci-dessus réside dans le fait que les produits pulvérulents ont, fréquemment, un caractère agressif qui provoque une usure du tiroir et/ou du gabarit. Ainsi, avec le temps, le dosage effectué n'est plus fiable et peut être la cause d'inconvénients graves lorsqu'il s'agit de réaliser le chargement d'un volume quelconque avec plusieurs produits pulvérulents devant être dosés relativement de façon précise.Another drawback of the above solution lies in the fact that the pulverulent products frequently have an aggressive character which causes wear on the drawer and / or the template. Thus, over time, the metering carried out is no longer reliable and can be the cause of serious drawbacks when it is a question of carrying out the loading of any volume with several pulverulent products which have to be metered relatively precisely.

On a proposé aussi de réaliser un doseur à partir d'une cuillère emplie par pénétration dans une réserve de produits puis arasée par une barrette prenant appui sur son bord supérieur. La fonction de dosage est ainsi correctement assurée mais, par contre, la fonction de distribution reste à accomplir convenablement.It has also been proposed to make a dispenser from a spoon filled by penetration into a reserve of products then leveled by a bar resting on its upper edge. The dosing function is thus correctly ensured but, on the other hand, the dispensing function remains to be performed properly.

Les solutions techniques connues à ce jour sont toutes responsables d'une rétention aléatoire sur leurs parois de particules de produits pulvérulents. Il en résulte, alors, de façon totalement aléatoire, la distribution de charges inférieures ou supérieures à celle initialement recherchée, selon que les parois retiennent des particules des charges distribuées ou, au contraire, délivrent brutalement, par suite d'une vibration ou d'un choc, les différentes particules retenues au cours des cycles de fonctionnement précédents.The technical solutions known to date are all responsible for a random retention on their walls of particles of pulverulent products. This results, then, in a completely random manner, the distribution of charges lower or greater than that initially sought, depending on whether the walls retain particles of the distributed charges or, on the contrary, deliver abruptly, as a result of a vibration or a shock, the different particles retained during previous operating cycles.

Un autre inconvénient des solutions techniques actuellement connues réside dans le fait que les dispositifs proposés ne permettent pas de s'opposer aux risques de propagation du feu en cas d'inflammation ou d'explosion soudaine, à un niveau quelconque de la chaîne transfert.Another drawback of the currently known technical solutions lies in the fact that the proposed devices do not make it possible to oppose the risks of propagation of the fire in the event of ignition or sudden explosion, at any level of the transfer chain.

-Des accidents particulièrement graves sont donc à craindre, dans le cas où une telle propagation a pour résultat de provoquer l'inflammation ou l'explosion de la capacité de stockage du produit pulvérulent.- Particularly serious accidents are therefore to be feared, in the event that such a propagation results in the ignition or explosion of the storage capacity of the pulverulent product.

On a proposé aussi de réaliser un doseur du type à cuillère emplie à partir d'une trémie d'alimentation et qui est déplacée jusqu'à un poste de vidage où elle est retournée au-dessus d'un entonnoir. Ceci est le cas du brevet GB-A-13 509 voir le préambule de la revendication 1. Une telle conception permet de doser la charge de produit transférée en faisant passer la cuillère sous une barrette d'arasement. Toutefois, cette conception ne permet absolument pas de s'opposer aux risques de propagation du feu en cas d'inflammation du produit pulvérulent, soit au stockage, soit lors du transfert, soit au vidage.It has also been proposed to produce a spoon-type dispenser filled from a feed hopper and which is moved to a dumping station where it is returned above a funnel. This is the case of patent GB-A-13 509 see the preamble of claim 1. Such a design makes it possible to measure the charge of product transferred by passing the spoon under a leveling bar. However, this design absolutely does not make it possible to oppose the risks of propagation of the fire in the event of ignition of the pulverulent product, either during storage, or during transfer, or during emptying.

L'invention vise à remédier aux différents inconvénients ci-dessus en proposant un nouveau dispositif doseur-distributeur pouvant être mis en oeuvre pour tout produit pulvérulent, mais offrant des caractéristiques de sûreté et de sécurité particulièrement adaptées au transfert de produits pulvérulents ayant un caractère inflammable ou explosif.The invention aims to remedy the various drawbacks above by proposing a new metering-dispensing device which can be used for any pulverulent product, but offering safety and security characteristics which are particularly suitable for the transfer of pulverulent products having a flammable nature. or explosive.

Un objet supplémentaire de l'invention est de proposer un nouveau dispositif doseur et distributeur dont la conception particulière est choisie pour isoler relativement les différents volumes de stockage, de dosage, de distribution et/ou de transfert, afin d'offrir des moyens susceptibles de s'opposer, le cas échéant, à la propagation d'un feu ou d'une explosion survenant inopinément à l'un quelconque des stades de transfert du produit pulvérulent dosé ou non.An additional object of the invention is to provide a new metering and dispensing device whose particular design is chosen to relatively isolate the various storage, metering, distribution and / or transfer volumes, in order to offer means capable of object to the spread of a fire or explosion, if applicable unexpectedly occurring at any one of the stages of transfer of the powdered product, whether metered or not.

Un autre objet de l'invention est de proposer un nouveau dispositif doseur et distributeur constituant un ensemble compact pouvant être aisément adapté ou démonté d'un poste de travail d'une machine transfert lorsqu'il convient d'adapter, sur ce dernier, un dispositif dont les caractéristiques de dosage et de distribution doivent être en rapport avec le volume utile offert par le contenant à charger.Another object of the invention is to propose a new metering and dispensing device constituting a compact unit which can be easily adapted or dismantled from a work station of a transfer machine when it is necessary to adapt, on the latter, a device whose dosing and distribution characteristics must be related to the useful volume offered by the container to be loaded.

Pour atteindre les buts ci-dessus, le dispositif doseur-distributeur pour produit pulvérulent conforme à l'invention est caractérisé en ce qu'il comprend:

  • - un corps de support et de fixation délimitant une chambre de remplissage et une chambre de vidage séparées par une arête transversale, la trémie étant portée par le corps et assurant l'alimentation en produit pulvérulent de la chambre de remplissage, et le doseur à cuillère étant porté par le corps et déplaçable cycliquement de la chambre de remplissage à la chambre de vidage et inversement,
  • - et un distributeur porté par le corps pour être placé sous la chambre de vidage et comportant un godet déplaçable cycliquement d'une position de chargement à l'aplomb de la chambre de vidage à une position de déchargement automatique dans laquelle il obture la sortie de la chambre de vidage.
To achieve the above goals, the metering-dispensing device for pulverulent product according to the invention is characterized in that it comprises:
  • - a support and fixing body delimiting a filling chamber and an emptying chamber separated by a transverse edge, the hopper being carried by the body and ensuring the supply of pulverulent product to the filling chamber, and the spoon dispenser being carried by the body and cyclically movable from the filling chamber to the emptying chamber and vice versa,
  • - And a distributor carried by the body to be placed under the emptying chamber and comprising a bucket which can be moved cyclically from a loading position directly above the emptying chamber to an automatic unloading position in which it closes the outlet of the emptying chamber.

Diverses autres caractéristiques ressortent de la description faite ci-dessous en référence aux dessins annexés qui montrent, à titre d'exemple non limitatif, une forme de réalisation de l'objet de l'invention.Various other characteristics will emerge from the description given below with reference to the appended drawings which show, by way of nonlimiting example, an embodiment of the subject of the invention.

La fig. 1 est une coupe-élévation, en partie arrachée, du dispositif doseur-distributeur.Fig. 1 is a sectional elevation, partially cut away, of the metering-dispensing device.

La fig. 2 est une vue transversale, partie en coupe, prise selon la ligne II-II de la fig. 1.Fig. 2 is a transverse view, partly in section, taken along line II-II of FIG. 1.

La fig. 3 est une vue latérale, en partie arrachée, prise selon la ligne III-III de la fig. 2.Fig. 3 is a side view, partially broken away, taken along line III-III of FIG. 2.

La fig. 4 est une vue de dessus prise selon la ligne IV-IV de la fig. 1.Fig. 4 is a top view taken along line IV-IV of FIG. 1.

Les fig. 5 et 6 sont des coupes partielles prises, respectivement, selon les lignes V-V et VI-VI de la fig. 1.Figs. 5 and 6 are partial sections taken, respectively, along the lines V-V and VI-VI of FIG. 1.

La fig. 7 est une coupe transversale partielle prise, à plus grande échelle, selon la ligne VII-VII de la fig. 1.Fig. 7 is a partial cross-section taken, on a larger scale, along the line VII-VII of FIG. 1.

Le dispositif doseur-distributeur pour produit pulvérulent comprend un corps de support et de fixation 1 destiné à être adapté, par tout moyen convenable, sur la platine 2 d'un poste de travail prévu pour assurer le garnissage, le remplissage, le chargement d'un contenant, tel que 3.The metering-dispensing device for powdery product comprises a support and fixing body 1 intended to be adapted, by any suitable means, to the plate 2 of a work station provided for filling, filling, loading of a container, such as 3.

La fig. 1 montre, pour faciliter la compréhension de ce qui suit, un exemple d'application dans lequel le contenant 3 est constitué par un étui ou une douille destiné à recevoir une ou des charges de produit pulvérulent dont le conditionnement définitif ultérieur est complété par la pose d'un opercule, non illustré aux dessins. Le contenant 3 peut être, par exemple, porté par un dispositif de transfert 4 faisant partie de l'organe mobile 5 d'une machine transfert à fonctionnement automatique.Fig. 1 shows, to facilitate understanding of the following, an example of application in which the container 3 is constituted by a case or a socket intended to receive one or more charges of pulverulent product whose subsequent final packaging is completed by laying a cover, not illustrated in the drawings. The container 3 can be, for example, carried by a transfer device 4 forming part of the movable member 5 of a transfer machine with automatic operation.

Le corps de support et de fixation 1 est, de préférence, constitué par deux demi-corps la et 1b (fig. 2) qui sont assemblés côte à côte par l'intermédiaire de vis 6. Tout autre mode de réalisation pourrait être envisagé et, notamment, il pourrait être retenu de réaliser le corps 1 en une seule pièce par moulage ou coulage.The support and fixing body 1 is preferably constituted by two half-bodies 1a and 1b (FIG. 2) which are assembled side by side by means of screws 6. Any other embodiment could be envisaged and , in particular, it could be chosen to make the body 1 in one piece by molding or casting.

Le corps 1 est réalisé pour délimiter, à partir de la surface supérieure ouverte, une chambre de remplissage 7 et une chambre de vidage 8. La chambre de remplissage 7 présente une conformation générale cylindrique d'axe horizontal, la section de cette chambre pouvant présenter, comme illustré par la fig. 2, une réduction progressive axiale en direction de la périphérie. La chambre de remplissage 7 communique avec un conduit de vidange 9 s'établissant entre le fond de la chambre et la base du corps 1. Le conduit de vidange 9 est obturé, en état de fonctionnement, par un bouchon 10.The body 1 is made to delimit, from the open upper surface, a filling chamber 7 and an emptying chamber 8. The filling chamber 7 has a generally cylindrical conformation of horizontal axis, the section of this chamber possibly having , as shown in fig. 2, a gradual axial reduction towards the periphery. The filling chamber 7 communicates with a drain pipe 9 being established between the bottom of the chamber and the base of the body 1. The drain pipe 9 is closed, in operating condition, by a plug 10.

La chambre de remplissage 7 est en relation avec un conduit d'intercommunication 11, à direction tangentielle, montant depuis la chambre 7 jusqu'à la partie inférieure d'une embase 12 rapportée de façon amovible sur la partie supérieure du corps 1. L'embase 12 délimite une cavité 13 en forme de tronc de cône ou de tronc de pyramide inversé dont la petite base est placée sensiblement dans le plan du bord supérieur ouvert. L' embase 12 est réservée à l'adaptation d'une trémie 14 d'alimentation de la chambre 7 en produit pulvérulent. La trémie 14 comporte une collerette 15 s'établissant dans le plan de la petite base ouverte dont la section est inférieure, pour des raisons qui apparaissent dans ce qui suit, à celle de la grande base de la cavité 13. La trémie 14 est associée à un détecteur de niveau 16 comprenant un balancier 17 muni d'une palette 18 à l'intérieur de la trémie 14. Le balancier 17 est monté pivotant sur un axe d'articulation 19 qui est porté par la trémie 14. Le balancier 17 est prolongé au-delà de l'axe 19 et porte un contrepoids d'équilibrage 20. L'axe 19 est de préférence, porté par un support 21 adapté sur la trémie 14 et conçu pour permettre le montage d'un contacteur 22 susceptible d'être actionné par le balancier 17 et, dans le cas présent, plus particulièrement, par le contrepoids 20. La trémie 14 est de préférence, associée aussi à un organe de brassage 14a dont la rotation intermittente permet de s'opposer à l'effet de voûte éventuel du produit pulvérulent.The filling chamber 7 is in relation to an intercommunication conduit 11, in a tangential direction, rising from the chamber 7 to the lower part of a base 12 removably attached to the upper part of the body 1. The base 12 defines a cavity 13 in the form of a truncated cone or inverted pyramid trunk whose small base is placed substantially in the plane of the open upper edge. The base 12 is reserved for the adaptation of a hopper 14 for supplying the chamber 7 with powdery product. The hopper 14 has a flange 15 which is established in the plane of the small open base, the cross section of which is smaller, for reasons which appear below, than that of the large base of the cavity 13. The hopper 14 is associated to a level detector 16 comprising a balance 17 provided with a pallet 18 inside the hopper 14. The balance 17 is pivotally mounted on a hinge pin 19 which is carried by the hopper 14. The balance 17 is extended beyond the axis 19 and carries a balancing counterweight 20. The axis 19 is preferably carried by a support 21 adapted on the hopper 14 and designed to allow the mounting of a contactor 22 capable of be actuated by the balance 17 and, in this case, more particularly, by the counterweight 20. The hopper 14 is preferably also associated with a stirring member 14a whose intermittent rotation makes it possible to oppose the effect of possible vault of the pulverulent product.

La chambre de vidage 8 présente une conformation du type tronc-pyramidal inversé. Cette chambre est délimitée, de façon à former avec la chambre 7 un alignement de direction perpendicul aire à l'axe géométrique de la chambre 7. La chambre de vidage 8 présente, entre ses faces inclinées, un angle d'inclinaison faible, de manière que ces dernières constituent des surfaces lisses à caractère abrupt proches de la verticale, pour des raisons qui apparaissent dans ce qui suit. Les chambres 7 et 8 sont ainsi séparées l'une de l'autre par une arête 1, formée par la matière constitutive du corps 1 et s'élevant au-dessus d'un plan horizontal fictif qui passerait par le fond de la chambre de remplissage 7.The emptying chamber 8 has a conformation of the inverted trunk-pyramidal type. This chamber is delimited, so as to form with the chamber 7 a directional alignment perpendicular to the geometric axis of the chamber 7. The emptying chamber 8 has, between its inclined faces, a small inclination angle, so that the latter constitute smooth surfaces of abrupt character close to vertical, for reasons that appear in the following. The chambers 7 and 8 are thus separated from each other by an edge 1, formed by the material constituting the body 1 and rising above a fictitious horizontal plane which would pass through the bottom of the filling 7.

Le corps 1 supporte un doseur rotatif, du type à cuillère, désigné dans son ensemble par la référence 23. Le doseur rotatif comprend un chariot 24 (fig. 3 et 4) qui est monté et guidé avec impossibilité de rotation sur une glissière 25 rapportée à l'extérieur du corps 1. Le chariot 24 supporte, à sa partie supérieure, un vérin 26 du type rotatif à double sens de rotation dont la plage de rotation angulaire peut être limitée. L'arbre de sortie 27 du vérin 26 porte un moyeu 28 sur lequel peut être fixé, de façon démontable, le bras 29 d'une cuillère de dosage 30. L'arbre 27 traverse un dégagement 31 présenté par la paroi correspondante du corps 1. L'arbre 27 s'étend ainsi à l'intérieur de la chambre 7 en étant, de préférence, confondu avec l'axe géométrique de cette dernière, dans une position stable d'arrêt correspondant, comme illustré par la fig. 1, à un état de remplissage.The body 1 supports a rotary dispenser, of the spoon type, designated as a whole by the reference 23. The rotary doser comprises a carriage 24 (fig. 3 and 4) which is mounted and guided with impossibility of rotation on a slide 25 attached outside the body 1. The carriage 24 supports, at its upper part, a jack 26 of the rotary type with two directions of rotation whose angular range of rotation can be limited. The output shaft 27 of the jack 26 carries a hub 28 on which can be fixed, in a removable manner, the arm 29 of a metering spoon 30. The shaft 27 passes through a clearance 31 presented by the corresponding wall of the body 1 The shaft 27 thus extends inside the chamber 7, preferably being coincident with the geometrical axis of the latter, in a corresponding stable stop position, as illustrated in FIG. 1, in a filling state.

Le bras 29 est monté sur l'arbre 27 de manière à être situé, de préférence, dans le plan médian de la chambre 7. La longueur du bras 29 est déterminée, de manière que la cuillère 30 ne soit pas amenée en contact avec la paroi périphérique définissant la chambre 7.The arm 29 is mounted on the shaft 27 so as to be located, preferably, in the median plane of the chamber 7. The length of the arm 29 is determined, so that the spoon 30 is not brought into contact with the peripheral wall defining the chamber 7.

Le moyeu 28 et le vérin 26 sont choisis, de manière que, dans la position stable d'arrêt de ce dernier, la cuillère 30 se trouve disposée selon une orientation sensiblement verticale, en-dessous d'un dispositif d'arasement 32 porté par le corps 1 pour s'étendre à l'intérieur de la chambre 7. Le dispositif 32 comprend une barrette 33 qui est maintenue par une pince 34, de manière à présenter un bord inférieur horizontal en regard de la section ouverte supérieure de la cuillére 30,The hub 28 and the actuator 26 are chosen so that, in the stable stop position of the latter, the spoon 30 is arranged in a substantially vertical orientation, below a leveling device 32 carried by the body 1 to extend inside the chamber 7. The device 32 comprises a bar 33 which is held by a clamp 34, so as to have a horizontal lower edge facing the upper open section of the spoon 30 ,

La pince 34 est fixée à la partie supérieure d'une tige 34a guidée extérieurement au corps 1 dans une glissière 34b de serrage et d'immobilisation axiale. La glissière 34b prend appui par sa base sur un bouton 34c prolongé par une vis 34d vissée dans le corps 1.The clamp 34 is fixed to the upper part of a rod 34a guided outside the body 1 in a slide 34b for clamping and axial immobilization. The slide 34b is supported by its base on a button 34c extended by a screw 34d screwed into the body 1.

Après des serrage de la glissière 34b, la manoeuvre du bouton 34c permet de modifier la position verticale de la barrette 33 et d'ajuster cette dernière au plan d'arasement. Ce réglage est ensuite maintenu de façon stable et précise par resserrage de la glissière 34b.After tightening of the slide 34b, the operation of the button 34c makes it possible to modify the vertical position of the bar 33 and to adjust the latter to the leveling plane. This setting is then maintained stably and precisely by tightening the slide 34b.

Le chariot 24 est relié par une plaque d'extrémité 35 à la tige 36 d'un vérin 37, monté par une bride de nez 38 sur le corps 1, pour s'étendre extérieurement à ce dernier et parallèlement à la glissière 25. Le vérin 37 est associé à deux contacteurs de fin de course 39 et 40 réglables, déterminant la course utile d'extension-rétraction de la tige 36 et, par suite, le déplacement alternatif imposé à l'axe 27. Cette course est déterminée en relation avec la longueur du dégagement 31 ménagé dans le corps 1 à partir de la chambre 7 pour s'étendre, au moins en partie également, dans la chambre de vidage 8.The carriage 24 is connected by an end plate 35 to the rod 36 of a jack 37, mounted by a nose flange 38 on the body 1, to extend outwardly to the latter and parallel to the slide 25. The cylinder 37 is associated with two adjustable limit switches 39 and 40, determining the useful stroke of extension-retraction of the rod 36 and, consequently, the reciprocating displacement imposed on the axis 27. This stroke is determined in relation with the length of the clearance 31 formed in the body 1 from the chamber 7 to extend, at least in part also, into the emptying chamber 8.

Le corps 1 supporte, à sa partie inférieure, un distributeur mobile alternatif 41 chargé d'assurer le transfert entre la chambre de vidage 8 et un entonnoir de remplissage 42 porté, directement ou indirectement, par le corps 1 ou son organe de support. De préférence, l'entonnoir 42 est associé à une commande de déplacement vertical en va et vient, afin de pouvoir être amené en appui étanche sur la partie supérieure du poste contenant 3. Le distributeur 41 peut être placé en relation directe avec la petite base inférieure ouverte de la chambre 8 ou avec celle d'un adaptateur de transfert 43 rapporté sous la face inférieure du corps 1. L'adaptateur 43 délimite un passage 44 de forme générale tronconique inversée, établissant la transition d'écoulement par gravité entre la chambre 8 et le distributeur. Le passage 44 possède une grande base de section plus grande que celle ouverte inférieure de la chambre 8.The body 1 supports, at its lower part, an alternative mobile distributor 41 responsible for ensuring the transfer between the emptying chamber 8 and a filling funnel 42 carried, directly or indirectly, by the body 1 or its support member. Preferably, the funnel 42 is associated with a vertical movement control back and forth, in order to be able to be brought into sealed support on the upper part of the station containing 3. The distributor 41 can be placed in direct relation with the small base. open lower part of the chamber 8 or with that of a transfer adapter 43 attached under the lower face of the body 1. The adapter 43 delimits a passage 44 of generally frustoconical inverted shape, establishing the flow transition by gravity between the chamber 8 and the distributor. The passage 44 has a large base with a larger cross section than that of the lower open chamber 8.

Le distributeur 41 comprend une console 45 suspendue à la partie inférieure du corps 1 pour assurer la fixation et le guidage des éléments constitutifs mobiles du distributeur 41. A cet effet, la console 45 comporte une traverse 46 supportant (fig. 5) le nez d'un vérin 47 du type à double effet. La tige de piston 48 du vérin 47 porte un chariot 49 guidé par des tiges cylindriques 50 dans des bagues 51 de la traverse 46. Les extrémités des tiges dirigées vers le corps du vérin 47 portent des butées 50a destinées à coopérer avec la traverse 46. Le chariot 49 porte, à l'opposé du vérin 47, un godet 52 délimitant une capacité de réception 53 d'une charge de produit pulvérulent. La capacité 53 est limitée par deux parois verticales, une paroi inclinée et par un volet pivotant 54 définissant la paroi frontale du godet, en considération du sens de déplacement correspondant au remplissage d'un contenant 3. Le volet 54 est monté pivotant par un axe horizontal 55 (fig. 7) sur la partie supérieure du godet 52. Le volet 54 est associé à un mécanisme 56 de commande automatique en ouverture et en fermeture. Le mécanisme 56 comprend, comme cela apparait à la fig. 6, une tige 57 montée dans des guides 58 portés respectivement par le corps 1 et la console 45. La tige 57 est associée à une butée 59 destinée à provoquer une commande positive en ouverture, comme cela apparait dans ce qui suit. La tige 57 est également associée à un organe élastique 60, par exemple du type hélicoidal, travaillant à la compression, enfilé concentriquement sur la tige pour être placé entre l'un des guides 58 et, par exemple, un épaulement de butée présenté par la tige.The dispenser 41 comprises a console 45 suspended from the lower part of the body 1 for fixing and guiding the movable constituent elements of the dispenser 41. To this end, the console 45 comprises a crosspiece 46 supporting (fig. 5) the nose of a cylinder 47 of the double-acting type. The piston rod 48 of the actuator 47 carries a carriage 49 guided by cylindrical rods 50 in rings 51 of the cross member 46. The ends of the rods directed towards the body of the actuator 47 carry stops 50a intended to cooperate with the cross member 46. The carriage 49 carries, opposite the cylinder 47, a bucket 52 defining a receiving capacity 53 of a load of powdery product. The capacity 53 is limited by two vertical walls, an inclined wall and by a pivoting flap 54 defining the front wall of the bucket, in consideration of the direction of movement corresponding to the filling of a container 3. The flap 54 is pivotally mounted by an axis horizontal 55 (fig. 7) on the upper part of the cup 52. The flap 54 is associated with a mechanism 56 for automatic opening and closing control. The mechanism 56 comprises, as appears in FIG. 6, a rod 57 mounted in guides 58 carried respectively by the body 1 and the console 45. The rod 57 is associated with a stop 59 intended to cause a positive opening command, as will appear in the following. The rod 57 is also associated with an elastic member 60, for example of the helical type, working under compression, threaded concentrically on the rod to be placed between one of the guides 58 and, for example, an abutment shoulder presented by the rod.

Le chariot 49 comporte un capot 61 s'étendant en direction de la console 45, de manière à recouvrir les tiges guides 50 et la tige de piston 48 lorsque le godet 52 est amené dans une position de délestage en relation avec l'entonnoir de transfert 42.The carriage 49 includes a cover 61 extending in the direction of the console 45, so as to cover the guide rods 50 and the piston rod 48 when the bucket 52 is brought into a load-shedding position in relation to the transfer funnel 42.

Le dispositif décrit ci-dessus fonctionne de la façon suivante.The device described above operates from the next way.

Dans un état de repos correspondant à un début de cycle opératoire, il peut être considéré que le vérin 47 a amené le godet 52 dans une position de chargement dans laquelle la capacité 53 est située à l'aplomb de la chambre de vidage 8.In a state of rest corresponding to the start of the operating cycle, it can be considered that the jack 47 has brought the bucket 52 into a loading position in which the capacity 53 is located directly above the emptying chamber 8.

Dans cette position, la butée 59 est reculée par rapport au guide 58, de sorte que le ressort 60 sollicite la tige dans le sens de la flèche f1' provoquant le pivotement du volet 54 en position fermée de la capacité 53.In this position, the stop 59 is moved back relative to the guide 58, so that the spring 60 biases the rod in the direction of the arrow f 1 ′ causing the flap 54 to pivot in the closed position of the capacity 53.

Le vérin 37a, par ailleurs, été alimenté pour provoquer l'extension de la tige de piston 36 amenant le chariot 24 dans la position où la cuillère 30 est placée en relation avec le volume de la chambre 8. Comme cela apparait en traits mixtes à la fig. 1, le vérin rotatif 26 a été alimenté pour que, par rotation de l'arbre 27, la section ouverte de la cuillère 30 soit dirigée vers la petite base de la chambre de vidage 8.The cylinder 37a, moreover, was supplied to cause the extension of the piston rod 36 bringing the carriage 24 into the position where the spoon 30 is placed in relation to the volume of the chamber 8. As appears in phantom lines fig. 1, the rotary actuator 26 has been supplied so that, by rotation of the shaft 27, the open section of the spoon 30 is directed towards the small base of the emptying chamber 8.

Le fonctionnement du dispositif implique qu'il soit chargé en produit pulvérulent introduit dans la trémie d'alimentation 14 qui assure, par gravité, via l'embase 12 et le conduit d'intercommunication 11, le remplissage de la chambre 7.The operation of the device implies that it is loaded with pulverulent product introduced into the feed hopper 14 which ensures, by gravity, via the base 12 and the intercommunication conduit 11, the filling of the chamber 7.

Un cycle de fonctionnement du dispositif doseur-distributeur s'établit de la façon suivante.An operating cycle of the metering-dispensing device is established as follows.

Le vérin 37 est alimenté pour provoquer la course de rétraction de la tige 36 amenant le chariot 24 dans la position où l'axe 27 du vérin rotatif 26 est placé en coïncidence avec l'axe géométrique de la chambre 7.The jack 37 is supplied to cause the retraction stroke of the rod 36 bringing the carriage 24 into the position where the axis 27 of the rotary jack 26 is placed in coincidence with the geometric axis of the chamber 7.

Cette position peut être déterminée par l'intermédiaire du contacteur 40 asservissant aussi, par exemple, le fonctionnement subséquent du vérin rotatif 26 alimenté pour provoquer la rotation de l'arbre 27 dans le sens de la flèche f2 (fig. 1).This position can be determined by means of the contactor 40 also controlling, for example, the subsequent operation of the rotary actuator 26 supplied to cause the rotation of the shaft 27 in the direction of the arrow f 2 (fig. 1).

La cuillère 30 est ainsi amenée à parcourir un cheminement angulaire à l'intérieur de la chambre 7 ce qui a pour effet d'assurer son remplissage naturel par déplacement relatif par rapport à la matière pulvérulente emplissant la chambre 7. La rotation de l'arbre 27 est commandée par le vérin 26 jusqu'à amener la cuillère 30 dans la position représentée en traits pleins à la fig. 1.The spoon 30 is thus brought to traverse an angular path inside the chamber 7 which has the effect of ensuring its natural filling by relative displacement relative to the pulverulent material filling the chamber 7. The rotation of the shaft 27 is controlled by the actuator 26 until the spoon 30 is brought into the position shown in solid lines in FIG. 1.

Dans cet état, l'alimentation du vérin 37 est inversée, de manière à commander la course d'extension de la tige de piston 36 provoquant le déplacement du chariot 24 dans le sens de la flèche f3 à la fig. 3.In this state, the supply to the jack 37 is reversed, so as to control the extension stroke of the piston rod 36 causing the carriage 24 to move in the direction of the arrow f 3 in FIG. 3.

La cuillère 30 est ramenée dans le volume de la chambre de vidage 8, tout en occupant, à l'intérieur de cette dernière, la même position que celle conférée à l'intérieur de la chambre 7.The spoon 30 is brought back into the volume of the emptying chamber 8, while occupying, inside the latter, the same position as that imparted inside the chamber 7.

Au cours de ce déplacement dans le sens de la flèche f3, l'orifice supérieur de la cuillère 30 passe sous la barrette 33 qui réalise un arasement sans compression de la dose de produit pulvérulent prélevée par la cuillère 30. Cette dose de produit est ainsi strictement limitée au volume utile offert et rempli par la cuillère 30. En outre, la fraction de produit excédentaire est déversée sur la masse de produit occupant la chambre 7 et ne conduit à aucune pollution de l'environnement.During this movement in the direction of the arrow f 3 , the upper orifice of the spoon 30 passes under the bar 33 which realizes a leveling without compression of the dose of pulverulent product taken up by the spoon 30. This dose of product is thus strictly limited to the useful volume offered and filled with the spoon 30. In addition, the fraction of excess product is poured onto the mass of product occupying the chamber 7 and does not lead to any pollution of the environment.

En fin de course d'extension, la pièce 35 commande le contacteur 39 chargé d'inverser l'alimentation du vérin rotatif 26. L'arbre 27 est ainsi entraîné en rotation dans le sens inverse à celui de la flèche f2 et ramène la cuillère 30 dans la position d'origine représentée en traits mixtes à la fig. 1. Ce mouvement de déplacement angulaire inverse de la cuillère 30 provoque le vidage de la dose de produit pulvérulent à l'intérieur de la chambre 8 où cette dose peut s'écouler par gravité, de façon sensiblement directe, compte tenu de la conformation géométrique conférée à la chambre 8. Il y a lieu de noter que les parois inclinées de la chambre 8 sont justement définies de manière à réduire le plus possible toute rétention de particules de produit pulvérulent, tout en conduisant la dose délivrée et vidée én direction de la capacité de réception 53 du godet 52.At the end of the extension stroke, the part 35 controls the contactor 39 responsible for reversing the supply of the rotary actuator 26. The shaft 27 is thus rotated in the opposite direction to that of the arrow f 2 and brings the spoon 30 in the original position shown in phantom in FIG. 1. This movement of reverse angular displacement of the spoon 30 causes the emptying of the dose of powdered product inside the chamber 8 where this dose can flow by gravity, in a substantially direct manner, taking into account the geometric conformation conferred on chamber 8. It should be noted that the inclined walls of chamber 8 are precisely defined so as to reduce as much as possible any retention of particles of pulverulent product, while driving the dose delivered and emptied in the direction of receiving capacity 53 of bucket 52.

La dose de produit est reçue dans la capacité 53 fermée et peut être maintenue dans cette dernière tant que le cycle de fonctionnement général, asservi à la présentation d'un contenant 3 dans la position de chargement ou remplissage désirée, n'a pas été déclenché par la validation de cette présence. Lorsque le déroulement de la seconde partie du cycle est autorisé, le vérin 47 est alimenté pour provoquer la course d'extension de la tige 48 conduisant le godet 52, de sa position de chargement, à la position de délestage dans laquelle il est, au moins en partie, engagé à l'aplomb de l'entonnoir 42, comme représenté à la fig. 1.The dose of product is received in the closed capacity 53 and can be maintained in the latter as long as the general operating cycle, subject to the presentation of a container 3 in the desired loading or filling position, has not been triggered by validating this presence. When the progress of the second part of the cycle is authorized, the jack 47 is supplied with power to cause the extension stroke of the rod 48 leading the bucket 52, from its loading position, to the load shedding position in which it is, at less in part, engaged directly above the funnel 42, as shown in FIG. 1.

La course d'extension de la tige 48, dans le sens de la flèche f4, se traduit par l'amenée de la cloison 61 en regard de l'orifice de sortie de la chambre 8 ou du passage 44. Cette cloison protège les glissières 50 et la tige 48 contre toute chute d'une ou plusieurs particules de matière pulvérulente.The extension stroke of the rod 48, in the direction of the arrow f 4 , results in the supply of the partition 61 opposite the outlet orifice of the chamber 8 or of the passage 44. This partition protects the slides 50 and the rod 48 against any fall of one or more particles of pulverulent material.

Vers la fin de course d'extension de la tige 48, la butée 59 entre en contact avec le guide 58 et s'oppose au coulissement libre de la tige 57. La poursuite du déplacement du godet 52, dans le sens de la flèche f4 (fig. 1), provoque alors l'ouverture automatique positive du volet pivotant 54 lorsque le godet 52 est engagé dans l'entonnoir 42 pour que l'orifice de sortie de la capacité 53 soit situé à l'intérieur de l'enveloppe interne de ce dernier. Ceci a pour effet de libérer la dose de produit pulvérulent qui est ainsi délestée dans l'entonnoir 42 la conduisant à l'intérieur du contenant 3.Towards the end of the rod extension stroke 48, the stop 59 comes into contact with the guide 58 and opposes the free sliding of the rod 57. The continued movement of the bucket 52, in the direction of the arrow f 4 (fig. 1), then causes the automatic positive opening of the pivoting flap 54 when the bucket 52 is engaged in the funnel 42 so that the capacity outlet orifice 53 is located inside the envelope internal of the latter. This has the effect of releasing the dose of pulverulent product which is thus relieved in the funnel 42 leading it inside the container 3.

Il y a lieu de noter que le délestage de la dose de produit occupant la capacité 53 se produit également par l'action de choc résultant de l'entrée en contact de la butée 59 avec le guide 58, action de choc transmise par la structure constitutive du distributeur 41 jusqu' au godet 52. Ce délestage s'établit aussi dans un deuxième temps par l'entrée en contact des butées 50a avec la console 46 produisant une onde de choc favorisant le décollement des particules par rapport aux parois.It should be noted that the shedding of the dose of product occupying the capacity 53 also occurs by the shock action resulting from the coming into contact of the stop 59 with the guide 58, shock action transmitted by the structure. constitutive of the distributor 41 up to the cup 52. This load shedding is also established in a second step by the coming into contact of the stops 50a with the console 46 producing a shock wave favoring the separation of the particles from the walls.

Le délestage de la dose de produit pulvérulent s'effectue en totalité par suite de la conformation de la capacité 53 délimitée par des surfaces verticales ou fortement inclinées qui sont, par ailleurs exécutées de manière à présenter un état de surface poli, de même que les parois constitutives de la chambre 8 et du passage 44.The unloading of the dose of pulverulent product is carried out in full as a result of the conformation of the capacity 53 delimited by vertical or strongly inclined surfaces which are, moreover executed so as to present a polished surface state, as well as the constituent walls of chamber 8 and passage 44.

En fin de course d'extension de la tige 48, le chariot 49 peut actionner, par un doigt 62, un contacteur de fin de course 63 responsable de l'inversion de l'alimentation du vérin 47. La tige 48 effectue sa course de rétraction en entrainant, dans le sens inverse à celui de la flèche f4, le godet 42 vers la position d'origine à l'aplomb de la chambre de vidage 8. La butée 59 quitte le guide 58, de sorte que le ressort 60 commande le retour en position automatique fermée du volet 54.At the end of the extension stroke of the rod 48, the carriage 49 can actuate, by a finger 62, a limit switch 63 responsible for reversing the power supply to the jack 47. The rod 48 performs its stroke of retraction by driving, in the opposite direction to that of arrow f 4 , the bucket 42 towards the original position directly above the emptying chamber 8. The stop 59 leaves the guide 58, so that the spring 60 controls the return to the automatic closed position of the flap 54.

Le retour en position d'origine du distributeur 41 peut être constaté par un contacteur de fin de course 64 actionné par le doigt 62 pour autoriser le déroulement d'un cycle de fonctionnement identique à celui décrit ci-dessus.The return to the original position of the distributor 41 can be observed by an end-of-travel switch 64 actuated by the finger 62 to authorize the running of an operating cycle identical to that described above.

Ainsi que cela ressort de ce qui précède, le dispositif doseur-distributeur conforme à l'invention représente un ensemble compact pouvant être aisément monté ou démonté sur un poste de travail par adaptation sur une platine ou plaque 2, afin de s'étendre en porte-à-faux et en surplomb d'une zone de travail ou de transfert le long de laquelle se présentent des contenants 3 successifs devant recevoir une même dose de produit pulvérulent.As is apparent from the above, the metering-dispensing device according to the invention represents a compact assembly which can be easily mounted or dismounted on a work station by adaptation on a plate or plate 2, in order to extend into the door -overhang and overhanging a work or transfer area along which there are successive containers 3 to receive the same dose of powdered product.

Par ailleurs, le dispositif est réalisé de manière que les différentes capacités, chambres ou cavités de réception ou de stockage momentané d'une dose de produits se trouvent suffisamment isolées entre elles au cours du cycle de fonctionnement, pour éviter toute propagation de feu ou d'explosion. En effet, l'arête 11 présente une conformation choisie pour éviter qu'une rétention éventuelle de produit pulvérulent vers la base de la chambre 8 puisse être la propagation d'une inflammation ou d'une explosion se propageant à la charge de produit pulvérulent occupant la chambre 7.Furthermore, the device is designed in such a way that the various capacities, chambers or cavities for receiving or temporarily storing a dose of products are sufficiently isolated from each other during the operating cycle, to avoid any propagation of fire or 'explosion. Indeed, the edge 1 1 has a conformation chosen to avoid that a possible retention of powdered product towards the base of the chamber 8 can be the propagation of an inflammation or an explosion propagating to the load of powdery product. occupying room 7.

Le capot 61 assume une fonction de cloison pare-feu dans la position de délestage du godet 52 et s'oppose à toute propagation remontante depuis l'entonnoir42 en direction de la chambre 7.The cover 61 assumes a firewall function in the load shedding position of the bucket 52 and is opposed to any upward propagation from the funnel 42 towards the chamber 7.

Le volet 54 assume également une même fonction de cloison pare-feu en direction de la dose de poudre déversée dans la capacité 53 placée à l'aplomb de la chambre 8.The shutter 54 also assumes the same function of firewall in the direction of the dose of powder poured into the capacity 53 placed directly above the chamber 8.

Le fonctionnement du dispositif doseur-distributeur peut se répéter de façon automatique, tant que la trémie 14 contient une quantité de produit pulvérulent suffisante pour assurer l'alimentation automatique de la chambre 7. Dès que cette quantité chute en dessous d'une valeur déterminée par le réglage du détecteur 16, le contacteur 22 assure le fonctionnement d'un témoin de rappel en vue du rechargement manuel de la trémie 14 ou d'un circuit de réalimentation automatique.The operation of the metering-dispensing device can be repeated automatically, as long as the hopper 14 contains a quantity of pulverulent product sufficient to ensure the automatic supply of the chamber 7. As soon as this quantity drops below a value determined by the setting of the detector 16, the contactor 22 ensures the operation of a reminder lamp for manual reloading of the hopper 14 or of an automatic make-up circuit.

La fig. 7 représente un détecteur de passage de produit pulvérulent à la base de la chambre 8. Ce détecteur comprend un balancier 65, monté sur un axe 66 porté par le corps 1. Le balancier comporte une palette 67 à son extrémité placée en permanence dans la chambre 8 après avoir traversé une fenêtre 71 ménagée dans la paroi du corps 1. L'extrémité du balancier opposée à la palette peut être munie d'un contrepoids d'équilibrage 68. Cette extrémité coopère avec un détecteur de passage 69, de tout type convenable, monté dans un boîtier 70 rapporté de façon étanche sur le corps 1. Dans le cas d'application à une poudre explosive, le détecteur 69 est constitué par un système fluidique émettant un jet de fluide sous pression en direction d'un capteur face auquel est placée l'extrémité du balancier dans un état stable, tel qu'illustré en traits forts.Fig. 7 shows a detector for the passage of powdery product at the base of the chamber 8. This detector comprises a pendulum 65, mounted on an axis 66 carried by the body 1. The pendulum comprises a pallet 67 at its end permanently placed in the chamber 8 after passing through a window 71 formed in the wall of the body 1. The end of the balance opposite the pallet can be provided with a balancing counterweight 68. This end cooperates with a passage detector 69, of any suitable type , mounted in a housing 70 sealingly attached to the body 1. In the case of application to an explosive powder, the detector 69 is constituted by a fluid system emitting a jet of pressurized fluid towards a sensor facing which is placed the end of the balance in a stable state, as illustrated in strong lines.

Chaque dose de produit distribuée influence le balancier qui passe dans la position temporaire représentée en traits mixtes. Le fonctionnement du détecteur 69 permet de considérer que la cuillère 30 a bien délivré une dose de produit. Au contraire, l'absence de constatation de fonctionnement dans un intervalle de temps donné fournit l'indication d'un défaut de fonctionnement du doseur 23.Each dose of product dispensed influences the balance which passes into the temporary position shown in phantom. The operation of the detector 69 makes it possible to consider that the spoon 30 has indeed delivered a dose of product. On the contrary, the absence of a functional finding in a given time interval provides an indication of a malfunction of the metering device 23.

Claims (9)

1. Device for the dose-metering and distribution of pulverulent product, of the type comprising a rotary dose-metering apparatus with spoon (23) which is movable according to a to-and-fro movement between a filling position (7) connected with a hopper (14) supplying the pulverulent product, and a position (8) for discharging said product, in which it is turned over, said spoon being caused, during its rectilinear movement between the filling position and the discharging position, to pass under a levelling bar (33) cooperating with its open top edge,
characterized in that it comprises:
- a support and mounting body (1) defining a filling chamber (7) and a discharging chamber (8) separated by a transversal edge (11), the hopper (14) being supported by the body and ensuring the supply of pulverulent product to the filling chamber (7) and the dose-metering device (23) with spoon (30) being carried by the body (1) and being movable cyclically from the filling chamber (7) to the discharging chamber (8) and vice-versa,
- and a distributor (41) carried by the body in order to be placed under the discharging chamber (8) and comprising a bowl (52) movable cyclically from a loading position plumb with the discharging chamber to an automatic unloading position in which it closes the outlet of the discharging chamber.
2. Device according to claim 1, characterized in that the support and mounting body (1) defines:
- a filling chamber (7) of cylindrical-type general shape of horizontal axis, and opening onto the upper face of the body,
- and a discharging chamber (8) of up-side- down truncated-pyramid shape, opening by the large base onto the upper face of the body and by the small base onto the lower face thereof and arranged so as to form with the filling chamber, an alignment directed perpendicularly to the axis of rotation of the latter and parallely to the moving direction of the dose-metering device (23).
3. Device according to claim 1 or 2, characterized in that the filling chamber (7) communicates via a tangential conduit (11) with the lower part of an adapting base (12) carried by the upper face of the body and supporting the supplying hopper (14).
4. Device according to claim 1, characterized in that the spoon (30) is mounted on a horizontal spindle (27) of a rotary jack (26) secured on a carriage (24) mounted in parallel to and on the outside of the body on a support and guide rail (25) and connected to a jack (37) moving back and forth, said spoon being carried by said spindle in order to be driven according to a rotary movement inside the volume of the discharging chamber or inside that of the filling chamber which comprises an adjustable bar (33) for the levelling said spoon when this is in loaded condition.
5. Device according to claim 1, characterized in that the distributor (41) comprises a bowl (52) carried by a carriage (49) mounted on rails (50) and associated to a driving member (47) for imparting a back and forth movement, said bowl defining a volume (53) of which one wall is constituted by a flap (54) mounted for pivoting about a vertical axis and connected to an opening and closing mechanism (57) working synchronously with the back and forth displacement of the carriage.
6. Device according to claim 5, characterized in that the flap (54) of the bowl (52) is operationally coupled to a mechanism controlling a closure by elastic return means and a positive opening in automatic unloading position.
7. Device according to claim 5 or 6, characterized in that the bowl (52) is operationally coupled to a flap (54) which occupies a frontal position considering the volume to be filled and the stroke of said bowl with a view to discharging its load into said volume.
8. Device according to claim 1, characterized in that the distributor (41) is operationally coupled to a wall (61) placed on the upper part of the carriage in order to close the outlet of the discharging chamber in the bowl relieving or discharging position.
9. Device according to claim 1, characterized in that the body is operationally coupled to detector means (67) for detecting the passage of each dose of product poured into the chamber (8).
EP84420114A 1983-09-13 1984-07-04 Dosing-feeding device for pulverulent products Expired EP0139598B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8314734A FR2551725B1 (en) 1983-09-13 1983-09-13 DISPENSING DEVICE FOR POWDERY PRODUCTS
FR8314734 1983-09-13

Publications (2)

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EP0139598A1 EP0139598A1 (en) 1985-05-02
EP0139598B1 true EP0139598B1 (en) 1987-09-23

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EP84420114A Expired EP0139598B1 (en) 1983-09-13 1984-07-04 Dosing-feeding device for pulverulent products

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EP (1) EP0139598B1 (en)
DE (1) DE3466368D1 (en)
FR (1) FR2551725B1 (en)

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US4629093A (en) 1986-12-16
DE3466368D1 (en) 1987-10-29
FR2551725B1 (en) 1985-12-06
FR2551725A1 (en) 1985-03-15
EP0139598A1 (en) 1985-05-02

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