WO1992012907A1 - Powder dispenser - Google Patents

Powder dispenser Download PDF

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Publication number
WO1992012907A1
WO1992012907A1 PCT/FR1992/000047 FR9200047W WO9212907A1 WO 1992012907 A1 WO1992012907 A1 WO 1992012907A1 FR 9200047 W FR9200047 W FR 9200047W WO 9212907 A1 WO9212907 A1 WO 9212907A1
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WO
WIPO (PCT)
Prior art keywords
worm
powder
cone
axis
stopper
Prior art date
Application number
PCT/FR1992/000047
Other languages
French (fr)
Inventor
Frédéric Carlier
Lionel Drugeault
Véronique THYRAULT
Original Assignee
Rhone-Poulenc Rorer S.A.
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 Rhone-Poulenc Rorer S.A. filed Critical Rhone-Poulenc Rorer S.A.
Publication of WO1992012907A1 publication Critical patent/WO1992012907A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F13/00—Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups
    • G01F13/001—Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups for fluent solid material
    • G01F13/005—Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups for fluent solid material comprising a screw conveyor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/06—Containers or packages with special means for dispensing contents for dispensing powdered or granular material

Definitions

  • the present invention relates to a device for the distribution by endless screw of very small quantities of powder without contamination and without loss of product.
  • the invention relates to a device allowing the distribution of small and defined quantities of powders.
  • the device which makes it possible to dispense very small quantities of powder, that is to say from approximately 1 mg, in a container without risk of contamination for the product, the manipulator and the environment and which makes it possible to avoid loss of product, cleaning of the distribution system and contamination.
  • the device operates with an accuracy close to 1 / 10th of mg.
  • the device according to the invention, or powder distributor which is shown diagrammatically in FIG. 1, consists of a cylindrical plug (1) the interior of which is conical and of a worm (2) passing through the plug perpendicular to its axis towards the tip of the cone.
  • the cap which is shown diagrammatically in FIG. 2, consists of:
  • the worm which is shown schematically in Figure 3, has a thin thread.
  • the pitch of the screw is equal to or slightly greater than the diameter of the screw.
  • the cylinder (8) in which the endless screw is placed opens out on either side of the stopper which allows the powder to flow at one end (9) and the transmission of the rotational movement of the screw to the other end (10) ( Figure 2).
  • the cone of the plug opens onto the worm, the section of the cone with the cylinder representing substantially a circle whose diameter is close to or equal to the width of the groove of the worm.
  • the thread of the screw has a thickness between 1 and 2 mm and a depth of 1 to 1.5 mm.
  • the device according to the invention is generally made from chemically and thermally inert materials such as teflon, polypropylene or polyethers.
  • Transmission of the rotary movement to the worm can be carried out by any manual or mechanical system.
  • the movement of the screw is controlled by the weighing indications of the balance by means of an external signal and it is stopped when the desired quantity of powder is reached.
  • the device according to the invention can be coupled to a system which facilitates its control.
  • This system which is shown schematically in Figure 4, is a "gun” which has a tool (11) which is positioned in the axis of the worm (12).
  • This tool can rotate in the two possible directions of rotation, the change of direction being ensured by a switch (13). Furthermore, the speed of rotation is proportional to the pressure exerted on the trigger (14). With this system, it is possible to obtain constant or variable flow rates depending on the nature of the powder and / or the quantity of powder desired.
  • this system can be completed with a movable and retractable finger
  • the gun and the powder distributor can be joined by any suitable fixing system (16).
  • the part of the gun carrying the positioning tool in the worm can be movable around the axis of the tool to ensure a rotation of 180 ° thus allowing the powder reservoir provided with its dispensing cap to be turned over.
  • the gun-dispenser assembly can be placed on a rail, thus allowing access, for example, to a scale.
  • the cap When the device for dispensing a powder is not used, the cap can be covered with a cap (17) ( Figure 1) which thus prevents contamination by dust or ambient air.
  • the powder dispenser according to the invention operates as follows:
  • each revolution of the worm screw drives the powder down by gravity into the cone towards the outlet orifice.
  • the container receiving the powder can be placed on the pan of a balance in order to continuously control the distribution,
  • the vial containing the powder to be dispensed is turned over and the worm is actuated in the other direction of rotation. As a result, the powder remaining in the screw is reintroduced into the dispensing bottle.
  • the device according to the invention makes it possible to distribute practically all the existing powders independently of their particle size or their density.
  • the particle size of the particles to be distributed is limited to the geometry of the groove of the worm (depth and width of the thread).
  • Aerosil 200 (apparent density: 0.07), levilite (apparent density: 0.17), dicalcium phosphate ( bulk density: 0.55) or salt (bulk density: 1.3), talc (bulk density: 0.57), acetophthalate cellulose (bulk density: 0.44), calcium sulfate (bulk density: 0.33) and magnesium stearate (bulk density: 0.23).
  • the device according to the invention due to its design and its operation, does not require any particular cleaning because, to each stopper corresponds a bottle and therefore a powder.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)

Abstract

A powder dispenser comprises a cylindrical cap (1) with conical inner face and an endless screw (2) passing through the cap perpendicularly to the axis passing through the cone apex.

Description

PISTRIBUTEUR PE POUPRES PE PEOPLE PISTRIBUTOR
La présente invention concerne un dispositif pour la distribution par vis sans fin de très faibles quantités de poudre sans contamination et sans perte de produit.The present invention relates to a device for the distribution by endless screw of very small quantities of powder without contamination and without loss of product.
Plus particulièrement, l'invention concerne un dispositif permettant la distribution de quantités faibles et définies de poudres.More particularly, the invention relates to a device allowing the distribution of small and defined quantities of powders.
Dans l'industrie chimique, à un stade quelconque de la fabrication d'un produit, il est nécessaire d'effectuer des pesées de produits, en particulier de poudres, qui doivent être distribués avec précision dans des récipients différents.In the chemical industry, at any stage in the production of a product, it is necessary to weigh products, in particular powders, which must be precisely dispensed in different containers.
En particulier dans l'industrie et les laboratoires pharmaceutiques, il devient de plus en plus indispensable de pouvoir disposer d'appareils qui permettent de traiter une grande variété de poudres avec une grande précision tout en évitant les contaminations et, très fréquemment, en distribuant des quantités de produits qui peuvent être comprises entre 5 et 1000 mg.In particular in industry and pharmaceutical laboratories, it is becoming more and more essential to be able to have devices which make it possible to process a wide variety of powders with great precision while avoiding contamination and, very frequently, distributing quantities of products which can be between 5 and 1000 mg.
Il a maintenant été trouvé, et c'est ce qui fait l'objet de la présente invention, un dispositif qui permet de distribuer de très faibles quantités de poudre, c'est-à-dire à partir d'environ 1 mg, dans un récipient sans risque de contamination pour le produit, le manipulateur et l'environnement et qui permet d'éviter la perte de produit, le nettoyage du système de distribution et la contamination. Le dispositif fonctionne avec une précision voisine de l/10ème de mg. Le dispositif selon l'invention, ou distributeur de poudres, qui est représenté schématiquement par la figure 1, est constitué d'un bouchon cylindrique (1) dont l'intérieur est conique et d'une vis sans fin (2) traversant le bouchon perpendiculairement à son axe vers la pointe du cône.It has now been found, and this is what is the subject of the present invention, a device which makes it possible to dispense very small quantities of powder, that is to say from approximately 1 mg, in a container without risk of contamination for the product, the manipulator and the environment and which makes it possible to avoid loss of product, cleaning of the distribution system and contamination. The device operates with an accuracy close to 1 / 10th of mg. The device according to the invention, or powder distributor, which is shown diagrammatically in FIG. 1, consists of a cylindrical plug (1) the interior of which is conical and of a worm (2) passing through the plug perpendicular to its axis towards the tip of the cone.
Le bouchon, qui est représenté schématiquement par la figure 2, est constitué :The cap, which is shown diagrammatically in FIG. 2, consists of:
- d'un cône (3) dont la base se termine par un filetage (4) afin de pouvoir le fixer sur le tube contenant la réserve de poudre à distribuer et dont la pointe débouche dans le logement cylindrique de la vis sans fin perpendiculaire à l'axe du cône,- a cone (3) whose base ends with a thread (4) so as to be able to fix it on the tube containing the reserve of powder to be dispensed and the tip of which opens into the cylindrical housing of the worm perpendicular to the axis of the cone,
- d'une lèvre d'étanchéité (5), à la limite du cône et du filetage, afin de minimiser les échanges entre l'air ambiant et la poudre,- a sealing lip (5), at the limit of the cone and the thread, in order to minimize the exchanges between the ambient air and the powder,
- d'un détrompage (6) qui permet de positionner le bouchon lorsqu'on utilise un système de distribution automatique,- a coding (6) which makes it possible to position the plug when using an automatic distribution system,
- d'une partie inclinée (7) faisant avec le plan perpendiculaire à l'axe du bouchon un angle compris entre 30 et 60° et, de préférence, voisin de 45°, permettant un meilleur écoulement de la poudre lors de sa distribution. La vis sans fin, qui est représentée schématiquement par la figure 3, comporte un filet de faible épaisseur. Généralement, le pas de la vis est égal ou légèrement supérieur au diamètre de la vis.- an inclined part (7) making with the plane perpendicular to the axis of the stopper an angle between 30 and 60 ° and preferably close to 45 °, allowing better flow of the powder during its distribution. The worm, which is shown schematically in Figure 3, has a thin thread. Generally, the pitch of the screw is equal to or slightly greater than the diameter of the screw.
Le cylindre (8) dans lequel est placée la vis sans fin débouche de part et d'autre du bouchon ce qui permet l'écoulement de la poudre à une extrémité (9) et la transmission du mouvement de rotation de la vis à l'autre extrémité (10) (figure 2).The cylinder (8) in which the endless screw is placed opens out on either side of the stopper which allows the powder to flow at one end (9) and the transmission of the rotational movement of the screw to the other end (10) (Figure 2).
Le cône du bouchon débouche sur la vis sans fin, la section du cône avec le cylindre représentant sensiblement un cercle dont le diamètre est voisin de ou égal à la largeur de la gorge de la vis sans fin. A titre indicatif, dans un dispositif relié à un tube contenant la réserve de poudre à distribuer dont le diamètre est voisin de 20 mm, l'angle formé par l'axe du cône et la paroi est compris entre 20 et 45°, le diamètre de la vis sans fin est voisin de 5 mm et est voisin du pas de vis, le filet de la vis a une épaisseur comprise entre 1 et 2 mm et une profondeur de 1 à 1,5 mm. Le dispositif selon l'invention est généralement réalisé dans des matériaux inertes chimiquement et thermiquement tels que le téflon, le polypropylène ou les polyéthers.The cone of the plug opens onto the worm, the section of the cone with the cylinder representing substantially a circle whose diameter is close to or equal to the width of the groove of the worm. As an indication, in a device connected to a tube containing the reserve of powder to be distributed, the diameter of which is close to 20 mm, the angle formed by the axis of the cone and the wall is between 20 and 45 °, the diameter of the worm is close to 5 mm and is close to the thread, the thread of the screw has a thickness between 1 and 2 mm and a depth of 1 to 1.5 mm. The device according to the invention is generally made from chemically and thermally inert materials such as teflon, polypropylene or polyethers.
La transmission du mouvement rotatif à la vis sans fin peut être réalisée par tout système manuel ou mécanique. En particulier, il est possible de coupler le système d'entraînement de la vis sans fin avec le système de pesée. Dans ces conditions le mouvement de la vis est asservi aux indications de pesée de la balance par l'intermédiaire d'un signal externe et il est arrêté lorsque la quantité de poudre désirée est atteinte.Transmission of the rotary movement to the worm can be carried out by any manual or mechanical system. In particular, it is possible to couple the worm drive system with the weighing system. In these conditions the movement of the screw is controlled by the weighing indications of the balance by means of an external signal and it is stopped when the desired quantity of powder is reached.
Le dispositif selon l'invention peut être couplé à un système qui facilite sa commande.The device according to the invention can be coupled to a system which facilitates its control.
Ce système, qui est représenté schématiquement par la figure 4, est un "pistolet" qui possède un outil (11) qui est positionné dans l'axe de la vis sans fin (12). Cet outil peut tourner dans les deux sens possibles de rotation, le changement de sens étant assuré par un interrupteur (13). Par ailleurs, la vitesse de rotation est proportionnelle à la pression exercée sur la gâchette (14). Avec ce système, il est possible d'obtenir des débits constants ou variables selon la nature de la poudre et/ou de la quantité de poudre désirée.This system, which is shown schematically in Figure 4, is a "gun" which has a tool (11) which is positioned in the axis of the worm (12). This tool can rotate in the two possible directions of rotation, the change of direction being ensured by a switch (13). Furthermore, the speed of rotation is proportional to the pressure exerted on the trigger (14). With this system, it is possible to obtain constant or variable flow rates depending on the nature of the powder and / or the quantity of powder desired.
De plus, ce système peut être complété par un doigt mobile et escamotableIn addition, this system can be completed with a movable and retractable finger
(15) qui peut venir frapper le bouchon distributeur, par exemple 2 fois par tour de la vis, afin de décolmater la poudre si nécessaire ou d'éliminer les effets de voûte ou de cheminée se formant.(15) which can strike the distributor cap, for example 2 times per turn of the screw, in order to unclog the powder if necessary or to eliminate the effects of arch or chimney forming.
Le pistolet et le distributeur de poudre peuvent être solidarisés par tout système de fixation (16) approprié. Enfin la partie du pistolet portant l'outil de positionnement dans la vis sans fin peut être mobile autour de l'axe de l'outil pour assurer une rotation de 180° permettant ainsi le retournement du réservoir de poudre muni de son bouchon distributeur.The gun and the powder distributor can be joined by any suitable fixing system (16). Finally, the part of the gun carrying the positioning tool in the worm can be movable around the axis of the tool to ensure a rotation of 180 ° thus allowing the powder reservoir provided with its dispensing cap to be turned over.
Enfin l'ensemble pistolet-distributeur peut être placé sur un rail permettant ainsi son accès, par exemple, dans une balance.Finally, the gun-dispenser assembly can be placed on a rail, thus allowing access, for example, to a scale.
Lorsque le dispositif pour distribuer une poudre n'est pas utilisé, le bouchon peut être recouvert d'une cape (17) (figure 1) qui empêche ainsi la contamination par la poussière ou l'air ambiant.When the device for dispensing a powder is not used, the cap can be covered with a cap (17) (Figure 1) which thus prevents contamination by dust or ambient air.
Le distributeur de poudre selon l'invention fonctionne de la manière suivante :The powder dispenser according to the invention operates as follows:
1) le flacon contenant la poudre à distribuer et muni du bouchon distributeur est placé verticalement, la pointe du cône du bouchon étant dirigée vers le bas, et l'extrémité de la vis par laquelle s'écoule la poudre est dans l'axe vertical du récipient destiné à recevoir la poudre,1) the bottle containing the powder to be dispensed and fitted with the dispensing cap is placed vertically, the tip of the cone of the cap being directed downwards, and the end of the screw through which the powder flows is in the vertical axis the container intended to receive the powder,
2) la vis sans fin étant actionnée par tout système approprié, chaque tour de vis sans fin entraîne la poudre descendue par gravité dans le cône vers l'orifice de sortie. Le récipient recevant la poudre peut être placé sur le plateau d'une balance afin de contrôler en continu la distribution,2) the worm screw being actuated by any suitable system, each revolution of the worm screw drives the powder down by gravity into the cone towards the outlet orifice. The container receiving the powder can be placed on the pan of a balance in order to continuously control the distribution,
3) dès que la quantité suffisante de poudre a été distribuée, la vis sans fin n'est plus actionnée et le dispositif est prêt pour une opération suivante.3) as soon as the sufficient quantity of powder has been dispensed, the auger is no longer actuated and the device is ready for a next operation.
Lorsque l'ensemble des opérations est terminé, le flacon contenant la poudre à distribuer est retourné et la vis sans fin est actionnée dans l'autre sens de rotation. Il en résulte que la poudre restant dans la vis est réintroduite dans le flacon de distribution.When all the operations have been completed, the vial containing the powder to be dispensed is turned over and the worm is actuated in the other direction of rotation. As a result, the powder remaining in the screw is reintroduced into the dispensing bottle.
Le dispositif selon l'invention permet de distribuer pratiquement toutes les poudres existantes indépendamment de leur granulométrie ou de leur densité. Pour les produits granulés, la granulométrie des particules à distribuer est limitée à la géométrie de la gorge de la vis sans fin (profondeur et largeur du filet).The device according to the invention makes it possible to distribute practically all the existing powders independently of their particle size or their density. For granulated products, the particle size of the particles to be distributed is limited to the geometry of the groove of the worm (depth and width of the thread).
Parmi les produits qui peuvent être distribués au moyen du dispositif selon l'invention peuvent être cités, par exemple, l'Aerosil 200 (densité apparente : 0,07), la lévilite (densité apparente : 0,17), le phosphate dicalcique (densité apparente : 0,55) ou le sel (densité apparente : 1,3), le talc (densité apparente : 0,57), l'acétophtalate de cellulose (densité apparente : 0,44), le sulfate de calcium (densité apparente : 0,33) et le stéarate de magnésium (densité apparente : 0,23).Among the products which can be distributed by means of the device according to the invention may be mentioned, for example, Aerosil 200 (apparent density: 0.07), levilite (apparent density: 0.17), dicalcium phosphate ( bulk density: 0.55) or salt (bulk density: 1.3), talc (bulk density: 0.57), acetophthalate cellulose (bulk density: 0.44), calcium sulfate (bulk density: 0.33) and magnesium stearate (bulk density: 0.23).
Le dispositif selon l'invention, du fait de sa conception et de son fonctionnement, ne nécessite pas de nettoyage particulier du fait que, à chaque bouchon correspond un flacon et par conséquent une poudre. The device according to the invention, due to its design and its operation, does not require any particular cleaning because, to each stopper corresponds a bottle and therefore a powder.

Claims

REVENDICATIONS
1 - Dispositif pour la distribution par vis sans fin de très faibles quantités de poudres caractérisé en ce qu'il est constitué d'un bouchon cylindrique dont l'intérieur est conique et d'une vis sans fin traversant le bouchon perpendiculairement à l'axe du bouchon vers la pointe du cône.1 - Device for the distribution by endless screw of very small quantities of powders characterized in that it consists of a cylindrical stopper whose interior is conical and of an endless screw passing through the stopper perpendicular to the axis from the plug to the tip of the cone.
2 - Dispositif selon la revendication 1 caractérisé en ce que le bouchon est constitué d'un cylindre dont l'intérieur est creusé en forme de cône dont la base est filetée pour permettre la fixation sur un tube approprié contenant la poudre à distribuer et dont la pointe débouche dans le logement cylindrique de la vis sans fin perpendiculaire à l'axe.2 - Device according to claim 1 characterized in that the stopper consists of a cylinder whose interior is hollowed out in the shape of a cone whose base is threaded to allow attachment to a suitable tube containing the powder to be dispensed and the point opens into the cylindrical housing of the worm perpendicular to the axis.
3 - Dispositif selon la revendication 1 caractérisé en ce qu'une extrémité de la vis sans fin permet l'écoulement de la poudre se trouvant dans la gorge de la vis sans fin et l'autre extrémité contient ou est reliée à un système de transmission d'un mouvement rotatif.3 - Device according to claim 1 characterized in that one end of the worm allows the flow of powder in the groove of the worm and the other end contains or is connected to a transmission system in a rotary motion.
4 - Dispositif selon l'une des revendications 1 ou 2 caractérisé en ce que l'angle du cône est compris entre 20 et 45°.4 - Device according to one of claims 1 or 2 characterized in that the angle of the cone is between 20 and 45 °.
5 - Dispositif selon l'une des revendications 1 ou 3 caractérisé en ce que la vis sans fin a un diamètre voisin de son pas.5 - Device according to one of claims 1 or 3 characterized in that the worm has a diameter close to its pitch.
6 - Dispositif selon l'une des revendications 1 ou 3 caractérisé en ce que la vis sans fin est mise en mouvement par tout système manuel ou mécanique.6 - Device according to one of claims 1 or 3 characterized in that the worm is set in motion by any manual or mechanical system.
7 - Dispositif selon l'une des revendications 1 ou 3 caractérisé en ce qu'il est couplé avec un système, muni d'un outil qui est positionné dans l'axe de la vis sans fin, permettant de faire varier et de contrôler la vitesse de rotation de la vis sans fin. 7 - Device according to one of claims 1 or 3 characterized in that it is coupled with a system, provided with a tool which is positioned in the axis of the worm, allowing to vary and control the rotational speed of the worm.
PCT/FR1992/000047 1991-01-25 1992-01-21 Powder dispenser WO1992012907A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR91/00866 1991-01-25
FR9100866A FR2672035A1 (en) 1991-01-25 1991-01-25 POWDER DISPENSER.

Publications (1)

Publication Number Publication Date
WO1992012907A1 true WO1992012907A1 (en) 1992-08-06

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PCT/FR1992/000047 WO1992012907A1 (en) 1991-01-25 1992-01-21 Powder dispenser

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WO (1) WO1992012907A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2775958A1 (en) * 1998-03-16 1999-09-17 Groupe Explorer Distribution cap for powdered or granular products contained in a flask

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2824315B1 (en) 2001-05-07 2003-09-05 Flexilab POWDER DOSING DEVICE
FR3029808B1 (en) * 2014-12-15 2018-10-19 Ekium POWDER DOSER WITH HOPPER AND SCREW

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2593803A (en) * 1949-05-20 1952-04-22 John D Schofield Dispensing attachment for containers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023883A1 (en) * 1979-03-16 1981-02-11 Helmuth Pils Device for automatic and measured emptying of a receptacle
DE3430702A1 (en) * 1984-08-21 1986-03-06 Klöckner-Humboldt-Deutz AG, 5000 Köln Discharge shaft for fine-grained tacky materials

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2593803A (en) * 1949-05-20 1952-04-22 John D Schofield Dispensing attachment for containers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2775958A1 (en) * 1998-03-16 1999-09-17 Groupe Explorer Distribution cap for powdered or granular products contained in a flask

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Publication number Publication date
FR2672035A1 (en) 1992-07-31

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