EP0143692B1 - Method and device for checking and controlling the filling of a series of containers by a given weight of a product having a variable volumetric weight - Google Patents

Method and device for checking and controlling the filling of a series of containers by a given weight of a product having a variable volumetric weight Download PDF

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Publication number
EP0143692B1
EP0143692B1 EP84402269A EP84402269A EP0143692B1 EP 0143692 B1 EP0143692 B1 EP 0143692B1 EP 84402269 A EP84402269 A EP 84402269A EP 84402269 A EP84402269 A EP 84402269A EP 0143692 B1 EP0143692 B1 EP 0143692B1
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EP
European Patent Office
Prior art keywords
filling
receptacle
controlling
volumetric dispenser
carrousel
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Expired
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EP84402269A
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German (de)
French (fr)
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EP0143692A1 (en
Inventor
André Jean-Jacques Graffin
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A BERTAUD ETS
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A BERTAUD ETS
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Priority to AT84402269T priority Critical patent/ATE33469T1/en
Publication of EP0143692A1 publication Critical patent/EP0143692A1/en
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    • 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
    • B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B3/26—Methods or devices for controlling the quantity of the material fed or filled

Definitions

  • the subject of the present invention is a method and a device for monitoring and controlling the chain filling of containers with a determined weight of product having a variable density.
  • this minimum time of presence of the container on the scale can be increased if containers are used whose weight varies from one container to another, which is the case for glass containers in particular, because it is necessary to tare each container. (One could naturally get rid of the need to tare each container by overdosing the product to be packaged so as to cover the variation in the weight of the containers but this would find the disadvantages presented by filling installations with volumetric dosing).
  • An object of the invention is to provide a method and a device making it possible to obtain very good dosing precision while filling at a high rate.
  • a method for monitoring and controlling the filling of containers comprising the steps of: successively engaging empty containers in a filling installation comprising an element of the rotary carrousel type with several filling stations , to weigh each container while it is still empty, to fill each container while comparing its weight to a set value by means of a scale moving with each filling station, and to stop the filling by closing a dispensing orifice when the set value is reached (such a process is known from document EP-A-052 546) characterized in that filling is carried out according to the steps of filling a volumetric metering device associated with each station with a volume of product whose weight is slightly greater than the set value, and transfer the product from the volumetric dispenser to the container under the effect of a c ommand, the abnormal forces resulting from the closure of the dispensing orifice before the flow of the total volume of product initially introduced into the volumetric dispenser being absorbed by elastic means interposed between the control member and the volume
  • a device for monitoring and controlling the filling of containers successively engaged in a filling installation comprising an element of the rotary carousel type with several filling stations, each filling station filling comprising filling means and a scale which moves with the station, the installation further comprising a calculation and storage device for taring a container, comparing the weight of the container with a set value during filling and control the stopping of filling by closing a dispensing orifice when the weight of the container contents reaches the set value (such a device is known from document EP-A-052 546), characterized in that the means to filling include a volumetric dispenser to receive a determined volume of product having a weight in excess of the set value on a first path of the carousel and transfer a part of this volume in a container on a second path of the carousel, the installation further comprising a control member for controlling the filling of each volumetric dispenser during the first journey of the carousel and
  • Figure 1 are shown the different phases of the path of a container on a chain filling installation comprising a rotary carousel 3 equipped with several filling stations.
  • the container is conveyed by a conveying means 1 to a distribution star 2 which introduces it at point 6 onto one of the filling stations of the carousel 3, which is driven in a rotational movement.
  • a distribution star 2 which introduces it at point 6 onto one of the filling stations of the carousel 3, which is driven in a rotational movement.
  • the container is tared, by resetting the balance to zero for example, while the filling of the volumetric metering device started at point 10 is completed.
  • point 7 and point 8 part of the volume of product contained in the volumetric dispenser is transferred with a rapid flow from the dispenser into the container.
  • the transfer continues with a slower flow until the container contains the desired weight of product.
  • the container is weighed continuously.
  • a calculation and storage unit a microprocessor for example, continuously compares the weight of the product contained in the container with the desired weight and, when this desired weight is reached, stops filling of the container.
  • the filled container then leaves the carousel 3 or tangentially to the carousel 3, on a conveying means 25 or else in a preferred direction, parallel to a conveying means 1 for example, via a distribution star 4 on a conveying means 5.
  • FIG. 2 shows a schematic sectional view of an exemplary embodiment of a filling station.
  • Each filling station is located on the rotary carousel 3 and comprises: an electronic balance 36; means 38 for centering a container 39; a hopper for supplying the product to be packaged 12; a volumetric metering device 37 comprising a piston 28 provided with sealing means 29, a cylinder 13 in which the piston 28 slides, a rod 33 actuating the piston 28; a distributor 14 comprising a body 19 and a cylindrical plug 18 capable of pivoting in the body 19.
  • the body 19 has a horizontal bore of axis 27; a vertical duct 24 located in its upper part and opening on the one hand into the feed hopper 12 and on the other hand into the bore of axis 27; a vertical duct 26 located in its upper part and opening on the one hand into the volumetric metering device 37 and on the other hand into the bore of axis 27; a vertical bore of the same axis as the conduit 26, surmounting the latter and receiving the cylinder 13 of the volumetric metering device 37; a vertical duct 30 situated in its lower part and opening on the one hand into the bore of axis 27 and on the other hand above the container 39.
  • the cylindrical plug 18 occupies the vertical bore of axis 27 of the body 19, in which it can pivot. It comprises a recess 15 which, in a determined position of the plug 18 relative to the body 19, connects the conduits 24 and 26 of the body 19; a cylindrical conduit 17, without communication with the recess 15, which, in another determined position of the plug 18 relative to the body 19, connects the conduits 26 and 30 of the body 19; a control lever 20 for pivoting the plug 18 inside the body 19. Electrical, pneumatic or equivalent means, not shown in the figure, act on the control lever 20 on the instructions that communicates to them the organ for calculation and storage.
  • the plug 18 When a filling station is located between points 10 and 7 of the path shown in FIG. 1, the plug 18 is positioned so that the recess 15 faces the conduits 24 and 26 of the body 19 and the hopper of supply 12 and the volumetric dispenser 37 are in communication (case of FIG. 2). When a filling station is between point 7 and the filling stop point located between points 8 and 9 of the path shown in Figure 1, the plug 18 is positioned so that the conduit 17 is facing the conduits 26 and 30 of the body 19 and the votumetric dispenser 37 and the container 39 are in communication.
  • FIG. 4 represents a schematic developed view of a cam controlling the operation of two filling stations. It must be understood that in reality such a cam is not located in a plane but is wound on a cylinder with the same center as the carousel and that it controls a number of filling stations, variable depending on the case, but well above 2.
  • the cam 34 shown in FIG. 4 comprises a rising ramp with two successive inclinations: ramp 340 between points 10 and 6, ramp 341 between points 6 and 7; a downward ramp with two inclinations: ramp 342 between points 7 and 8, ramp 343 between points 8 and 9; a horizontal part 344 between points 9 and 10 (the numbering of these points corresponds to that of FIG. 1).
  • the upward path corresponds to the filling of the volumetric dispenser 37.
  • the downward path corresponds in part to the transfer of the product from the volumetric doser 37 into the container 39.
  • the cam 34 is fixed relative to the rotary carousel 3 on which the filling stations are installed. It controls the operation of each of them by guiding a roller 32 secured to the rod 33 of the piston 28, by the interposition of elastic means 40 fixed on the one hand to the end of the rod 33, on the other hand to a fixed point 41 secured to the carousel.
  • the elastic means 40 work in compression and keep the roller 32 in contact with the cam 34 which allows the guide of the roller 32 by the cam on the downward ramp thereof. They have another function: when the container 39 is filled with the desired weight of product, the calculation and storage unit controls the closing of the dispensing orifice of the volumetric dispenser. The stroke of the piston 28 is thereby interrupted.
  • the roller 32 was guided along the downward ramp by rigid means, a rail parallel to the cam 34 coming into contact with the upper part of the roller, for example, damage would ensue.
  • the elastic means 40 the compression force of which has been calculated so that it is greater than the resistance encountered by the piston of the volumetric dispenser when it drives the product into the container, but less than the resistant force exerted on the elastic means by the piston rod when it is blocked, absorb the excess travel of the piston.
  • the roller 32 leaves the contact of the descending ramp of the cam at the point of stopping the filling of the container and resumes contact with the rising ramp of the cam at a point situated in the same horizontal plane as the point of stopping the filling of the container.
  • the guiding of the roller 32 by the cam 34 with the interposition of elastic means also constitutes security for the filling installation: the accidental blocking of a piston does not cause any unfortunate consequence of the fact that the roller can escape from drug.
  • the filling of the volumetric metering device 37 can be modified so that the point of stopping the filling of the container 39 takes place between points 8 and 9, that is to say on the descending ramp 343, when the filling rate is slow.
  • FIG. 4 is shown a device, allowing the modification of the volume admitted into the volumetric metering device, constituted by a part of an ascending ramp 341 of the cam 34 with adjustable inclination, and a geared motor 25 actuating an endless screw 16.
  • the inclination of the ramp part 341 is adjusted so that the point of stopping the filling of the containers takes place between points 8 and 9.
  • the calculation and storage unit records the coordinates of the stop point for filling each container and check that it is on the ramp part 343. If for some reason or other a drift occurs and the stop point for filling the containers closer to point 8 or point 9 beyond determined set values, the calculation and storage unit would command a modification of the inclination of the ramp part 341, up or down depending on the sense of drift.
  • FIG. 5 represents an exemplary embodiment of elastic means interposed between the cam 34 and the rod 33 of the piston of each volumetric metering device 37.
  • the elastic means used in this example consist of a pneumatic cylinder comprising a cylinder 44 secured to the carousel 3, a piston 43 sliding in the cylinder 44, a rod 42 fixed to the piston 43 at one end and secured to the roller 32 at the other end.
  • the pneumatic cylinder of each filling station is connected to the cylinder of all the other filling stations and to a buffer volume 46 by a pipe 45.
  • Figure 6 shows the sectional view of another embodiment of elastic means interposed between the cam 34 and the rod 33 of the piston of each volumetric metering device.
  • the piston 28 of the volumetric metering device 37 is surmounted by a cylindrical part 47 comprising a bore intended to guide the end of the rod 33.
  • the rod 33 comprises a vertical slot 48. It enters the bore of the cylindrical part 47 where it can slide vertically between two extreme positions defined by light 48, light in which passes a horizontal pin 50 taken at its two ends in the cylindrical part 47.
  • On the rod 33 is further fixed by a pin 51, a ring 49 having a shoulder.
  • a spring 52 working in compression is disposed between the ring 49 and the piston 28 along the axis of the rod 33.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Container Filling Or Packaging Operations (AREA)

Abstract

Each filling station comprises a balance (36) and a piston and cylinder volumetric dispenser (37). The piston rod (33) is actuated by a cam (34) which optionally includes a portion (341) which is adjustable. Resilient means (40) are interposed between the cam and the piston. While a receptacle (39) is engaged in a filling station the following operations take place in succession: the empty receptacle is weighed and at the same time the volumetric dispenser is filled with slightly more material than is to be dispensed; the material in the volumetric dispenser (37) is then transferred to the receptacle (39) and the receptacle is continuously weighed until it has received the set weight of material. The outlet from the dispenser is then closed, thus jamming its piston before it reaches the end of its stroke. The resulting forces are absorbed by the resilient means. Optionally, the amount material which is admitted to the dispenser prior to each filling operation is adjusted by acting on the said adjustable portion of the cam, to ensure that receptacle filling is stopped in the vicinity of a predetermined point on the cam or of the piston stroke.

Description

La présente invention a pour objet un procédé et un dispositif de contrôle et de commande du remplissage à la chaîne de récipients par un poids déterminé de produit ayant un poids volumique variable.The subject of the present invention is a method and a device for monitoring and controlling the chain filling of containers with a determined weight of product having a variable density.

Dans de nombreuses industries, telles que les industries agro-alimentaire, pétrolière, pharmaceutique, chimique, par exemple, on a besoin de conditionner des produits liquides ou pâteux de poids volumique variable, cette variation de poids volumique pouvant être due soit à la dilatation ou à la rétraction de produits homogènes soumis à des variations de température soit à la nature même des produits quand ils sont hétérogènes. Un problème se pose lorsqu'on se propose de remplir à la chaîne des récipients avec un poids déterminé de tels produits.In many industries, such as the food industry, petroleum, pharmaceutical, chemical, for example, there is a need to package liquid or pasty products of variable density, this variation in density may be due to either expansion or to the shrinkage of homogeneous products subjected to temperature variations or to the very nature of the products when they are heterogeneous. A problem arises when it is proposed to fill the chain containers with a determined weight of such products.

Si l'on utilise des installations de remplissage équipées de doseurs volumétriques, il est nécessaire de surdoser le produit à conditionner de façon que, dans le cas le plus défavorable, c'est-à-dire le cas où le poids volumique du produit est le plus faible, les récipients contiennent exactement le poids de produit désiré.If filling installations equipped with volumetric dosers are used, it is necessary to overdose the product to be packaged so that, in the most unfavorable case, that is to say the case where the density of the product is the weakest, the containers contain exactly the desired weight of product.

Ce surdosage nécessaire pour garantir au moins le poids de produit désiré dans chaque récipient entraîne un manque à gagner pour le fabricant du produit, puisque les excédents s'additionnant, c'est un volume non négligeable de produit qui est distribué sans être vendu.This overdose necessary to guarantee at least the desired weight of product in each container leads to a shortfall for the manufacturer of the product, since the surpluses add up, it is a significant volume of product which is distributed without being sold.

Si l'on utilise des installations de remplissage à dosage pondéral comportant une balance sur laquelle les récipients sont remplis et pesés l'un après l'autre, comme décrit dans le document EP-A-52 546, on n'a plus à tenir compte des variations de poids volumique. Cependant, dans la pratique, on se heurte à plusieurs difficultés. Pour être précis le pesage du récipient doit durer un temps minimal lié principalement au mode d'alimentation par gravité des dispositifs à dosage pondéral. Or ce temps minimal est supérieur à la durée de remplissage de chaque récipient que permettent les installations de remplissage à cadence élevée comme celles qui sont utilisées pour le conditionnement de la confiture par exemple. (Le diamètre de l'orifice des pots de confiture étant important, leur remplissage est très rapide). En outre, ce temps minimal de présence du récipient sur la balance peut être augmenté si l'on utilise des récipients dont le poids varie d'un récipient à l'autre, ce qui est le cas des récipients de verre notamment, car il est nécessaire d'effectuer le tarage de chaque récipient. (On pourrait naturellement s'affranchir de la nécessité de tarer chaque récipient en surdosant le produit à conditionner de façon à couvrir la variation du poids des récipients mais ce serait retrouver les inconvénients présentés par les installations de remplissage à dosage volumétrique). Avec de telles installations de remplissage on se trouve donc devant la nécessité ou de réduire la cadence de remplissage pour permettre le pesage précis du contenu de chaque récipient et éventuellement le tarage de chaque récipient ou, si on décide de maintenir la cadence de remplissage, de se contenter d'un pesage approximatif, - mais il faut alors surdoser le produit à conditionner pour être assuré que chaque récipient contiendra au moins le poids désiré (et l'on retrouve à nouveau les inconvénients présentés par les installations de remplissage à dosage volumétrique). Dans un cas comme dans l'autre la solution adoptée n'est pas pleinement satisfaisante puisqu'elle se traduit toujours, - perte de temps ou perte de produit -, par un manque à gagner.If we use filling systems with weight dosing comprising a scale on which the containers are filled and weighed one after the other, as described in document EP-A-52 546, we no longer have to keep account for variations in density. However, in practice, there are several difficulties. To be precise, the weighing of the container must last a minimum time related mainly to the mode of gravity feeding of the weight metering devices. However, this minimum time is greater than the duration of filling of each container that high-speed filling installations such as those used for packaging jam allow. (The diameter of the orifice of the jars of jam being important, their filling is very fast). In addition, this minimum time of presence of the container on the scale can be increased if containers are used whose weight varies from one container to another, which is the case for glass containers in particular, because it is necessary to tare each container. (One could naturally get rid of the need to tare each container by overdosing the product to be packaged so as to cover the variation in the weight of the containers but this would find the disadvantages presented by filling installations with volumetric dosing). With such filling installations, we therefore find ourselves faced with the need to reduce the filling rate to allow precise weighing of the contents of each container and possibly the taring of each container or, if we decide to maintain the filling rate, be satisfied with an approximate weighing, - but it is then necessary to overdose the product to be conditioned to be sure that each container will contain at least the desired weight (and we again find the disadvantages presented by filling installations with volumetric dosing) . In either case, the solution adopted is not fully satisfactory since it always results, - loss of time or loss of product -, by a shortfall.

Un but de l'invention est de proposer un procédé et un dispositif permettant d'obtenir une très bonne précision du dosage tout en effectuant le remplissage à une cadence élevée.An object of the invention is to provide a method and a device making it possible to obtain very good dosing precision while filling at a high rate.

En vue de la réalisation de ce but, on prévoit un procédé de contrôle et de commande du remplissage de récipients comportant les étapes : d'engager successivement des récipients vides dans une installation de remplissage comportant un élément de type carrousel rotatif à plusieurs postes de remplissage, de peser chaque récipient alors qu'il est encore vide, d'effectuer le remplissage de chaque récipient tout en comparant son poids à une valeur de consigne au moyen d'une balance se déplaçant avec chaque poste de remplissage, et d'arrêter le remplissage par fermeture d'un orifice de distribution lorsque la valeur de consigne est atteinte, (un tel procédé est connu du document EP-A-052 546) caractérisé en ce que le remplissage est effectué selon les étapes de remplir un doseur volumétriquè associé à chaque poste avec un volume de produit dont le poids est légèrement supérieur à la valeur de consigne, et transférer le produit du doseur volumétrique au récipient sous l'effet d'un organe de commande, les efforts anormaux résultant de la fermeture de l'orifice de distribution avant l'écoulement du volume total de produit initialement introduit dans le doseur volumétrique étant absorbés par des moyens élastiques interposés entre l'organe de commande et le doseur volumétrique.With a view to achieving this aim, a method for monitoring and controlling the filling of containers is provided, comprising the steps of: successively engaging empty containers in a filling installation comprising an element of the rotary carrousel type with several filling stations , to weigh each container while it is still empty, to fill each container while comparing its weight to a set value by means of a scale moving with each filling station, and to stop the filling by closing a dispensing orifice when the set value is reached (such a process is known from document EP-A-052 546) characterized in that filling is carried out according to the steps of filling a volumetric metering device associated with each station with a volume of product whose weight is slightly greater than the set value, and transfer the product from the volumetric dispenser to the container under the effect of a c ommand, the abnormal forces resulting from the closure of the dispensing orifice before the flow of the total volume of product initially introduced into the volumetric dispenser being absorbed by elastic means interposed between the control member and the volumetric dispenser.

Pour la mise en oeuvre de ce procédé, on prévoit également selon l'invention un dispositif de contrôle et de commande du remplissage de récipients engagés successivement dans une installation de remplissage comportant un élément de type carrousel rotatif à plusieurs postes de remplissage, chaque poste de remplissage comprenant des moyens de remplissage et une balance qui se déplace avec le poste, l'installation comportant en outre un organe de calcul et de mise en mémoire pour effectuer le tarage d'un récipient, comparer le poids du récipient à une valeur de consigne pendant le remplissage et commander l'arrêt du remplissage par fermeture d'un orifice de distribution quand le poids du contenu du récipient atteint la valeur de consigne (un tel dispositif est connu du document EP-A-052 546), caractérisé en ce que les moyens de remplissage comprennent un doseur volumétrique pour recevoir un volume déterminé de produit ayant un poids en excès par rapport à la valeur de consigne sur un premier trajet du carrousel et transférer une partie de ce volume dans un récipient sur un second trajet du carrousel, l'installation comportant en outre un organe de commande pour commander le remplissage de chaque doseur volumétrique pendant le premier trajet du carrousel et le transfert d'une partie de son contenu dans un récipient pendant le second trajet du carrousel et des moyens élastiques interposés entre l'organe de commande et le doseur volumétrique pour reprendre les efforts anormaux résultant de la fermeture de l'orifice de distribution du doseur volumétrique avant l'écoulement du volume total de produit qui a été initialement introduit.For the implementation of this method, there is also provided according to the invention a device for monitoring and controlling the filling of containers successively engaged in a filling installation comprising an element of the rotary carousel type with several filling stations, each filling station filling comprising filling means and a scale which moves with the station, the installation further comprising a calculation and storage device for taring a container, comparing the weight of the container with a set value during filling and control the stopping of filling by closing a dispensing orifice when the weight of the container contents reaches the set value (such a device is known from document EP-A-052 546), characterized in that the means to filling include a volumetric dispenser to receive a determined volume of product having a weight in excess of the set value on a first path of the carousel and transfer a part of this volume in a container on a second path of the carousel, the installation further comprising a control member for controlling the filling of each volumetric dispenser during the first journey of the carousel and the transfer of part of its contents into a container during the second journey of the carousel and elastic means interposed between the control and the volumetric dispenser to resume the abnormal forces resulting from the closure of the dispensing orifice of the volumetric dispenser before the flow of the total volume of product which was initially introduced.

Ainsi on obtient une cadence élevée par une manoeuvre rapide du doseur volumétrique et néanmoins une précision élevée en raison du contrôle au moyen des balances.Thus, a high rate is obtained by a rapid operation of the volumetric dispenser and nevertheless a high precision due to the control by means of scales.

D'autres caractéristiques et avantages de la présente invention apparaîtront mieux à la lecture de la description suivante faite en liaison avec les dessins ci-joints parmi lesquels :

  • La figure 1 est une vue de dessus schématique d'une installation de remplissage comportant un élément de type carrousel rotatif, où ont été représentées les différentes phases du cheminement d'un récipient ou un poste de remplissage ;
  • La figure 2 est une vue en coupe schématique d'un exemple de réalisation d'un poste de remplissage :
  • La figure 3 est une vue en coupe schématique selon la ligne II-II de l'exemple de réalisation d'un poste de remplissage représenté sur la figure 2, la trémie d'alimentation et le doseur volumétrique n'étant pas représentés ;
  • - La figure 4 est une vue schématique développée d'une came et de deux postes de remplissage, celui de gauche étant représenté sur le premier trajet de la came, celui de droite sur la première partie du second trajet de la came ;
  • La figure 5 est une vue schématique développée de la came et de quelques vérins pneumatiques interposés entre ladite came et les doseurs volumétriques (non représentés sur cette figure) et reliés entre eux par une canalisation à un volume tampon ; et
  • La figure 6 est une vue en coupe d'un exemple de réalisation de moyens élastiques interposés entre la came et le doseur volumétrique.
Other characteristics and advantages of the present invention will appear better on reading the following description made in conjunction with the attached drawings, among which:
  • Figure 1 is a schematic top view of a filling installation comprising an element of the rotary carousel type, where have been shown the different phases of the movement of a container or a filling station;
  • Figure 2 is a schematic sectional view of an exemplary embodiment of a filling station:
  • Figure 3 is a schematic sectional view along line II-II of the embodiment of a filling station shown in Figure 2, the feed hopper and the volumetric metering device not being shown;
  • - Figure 4 is a schematic developed view of a cam and two filling stations, the left one being shown on the first path of the cam, the right one on the first part of the second path of the cam;
  • Figure 5 is a schematic developed view of the cam and some pneumatic cylinders interposed between said cam and the volumetric metering units (not shown in this figure) and connected together by a pipe to a buffer volume; and
  • Figure 6 is a sectional view of an embodiment of elastic means interposed between the cam and the volumetric metering device.

Sur la figure 1 sont représentées les différentes phases du trajet d'un récipient sur une installation de remplissage à la chaîne comportant un carrousel rotatif 3 équipé de plusieurs postes de remplissage. Le récipient est acheminé par un moyen de convoyage 1 vers une étoile de distribution 2 qui l'introduit au point 6 sur l'un des postes de remplissage du carrousel 3, lequel est animé d'un mouvement de rotation. Entre le point 6 et le point 7 le récipient est taré, par remise de la balance à zéro par exemple, tandis que s'achève le remplissage du doseur volumétrique commencé au point 10. Entre le point 7 et le point 8 une partie du volume de produit contenu dans le doseur volumétrique est transféré avec un débit rapide du doseur dans le récipient. Entre le point 8 et un point situé avant le point 9 le transfert se poursuit avec un débit plus lent jusqu'à ce que le récipient contienne le poids de produit désiré. Entre le point 7 et le point d'arrêt du remplissage, qui selon une caractéristique particulière de l'invention est calculé pour intervenir entre le point 8 et le point 9, le récipient est pesé continûment. Un organe de calcul et de mise en mémoire, un microprocesseur par exemple, compare continûment le poids du produit contenu dans le récipient au poids désiré et, quand ce poids désiré est atteint commande l'arrêt du remplissage du récipient. Le récipient rempli quitte ensuite le carrousel 3 ou bien tangentiellement au carrousel 3, sur un moyen de convoyage 25 ou bien selon une direction préférentielle, parallèlement au un moyen de convoyage 1 par exemple, Par l'intermédiaire d'une étoile de distribution 4 sur un moyen de convoyage 5.In Figure 1 are shown the different phases of the path of a container on a chain filling installation comprising a rotary carousel 3 equipped with several filling stations. The container is conveyed by a conveying means 1 to a distribution star 2 which introduces it at point 6 onto one of the filling stations of the carousel 3, which is driven in a rotational movement. Between point 6 and point 7 the container is tared, by resetting the balance to zero for example, while the filling of the volumetric metering device started at point 10 is completed. Between point 7 and point 8 part of the volume of product contained in the volumetric dispenser is transferred with a rapid flow from the dispenser into the container. Between point 8 and a point before point 9 the transfer continues with a slower flow until the container contains the desired weight of product. Between point 7 and the filling stop point, which according to a particular characteristic of the invention is calculated to intervene between point 8 and point 9, the container is weighed continuously. A calculation and storage unit, a microprocessor for example, continuously compares the weight of the product contained in the container with the desired weight and, when this desired weight is reached, stops filling of the container. The filled container then leaves the carousel 3 or tangentially to the carousel 3, on a conveying means 25 or else in a preferred direction, parallel to a conveying means 1 for example, via a distribution star 4 on a conveying means 5.

La figure 2 représente une vue en coupe schématique d'un exemple de réalisation d'un poste de remplissage. Chaque poste de remplissage est situé sur le carrousel rotatif 3 et comporte : une balance électronique 36 ; des moyens 38 pour centrer un récipient 39 ; une trémie d'alimentation du produit à conditionner 12 ; un doseur volumétrique 37 comportant un piston 28 muni de moyens d'étanchéité 29, un cylindre 13 dans lequel coulisse le piston 28, une tige 33 actionnant le piston 28 ; un distributeur 14 comportant un corps 19 et un boisseau cylindrique 18 susceptible de pivoter dans le corps 19.Figure 2 shows a schematic sectional view of an exemplary embodiment of a filling station. Each filling station is located on the rotary carousel 3 and comprises: an electronic balance 36; means 38 for centering a container 39; a hopper for supplying the product to be packaged 12; a volumetric metering device 37 comprising a piston 28 provided with sealing means 29, a cylinder 13 in which the piston 28 slides, a rod 33 actuating the piston 28; a distributor 14 comprising a body 19 and a cylindrical plug 18 capable of pivoting in the body 19.

Le corps 19 comporte un alésage horizontal d'axe 27 ; un conduit vertical 24 situé dans sa partie supérieure et débouchant d'une part dans la trémie d'alimentation 12 et d'autre part dans l'alésage d'axe 27 ; un conduit vertical 26 situé dans sa partie supérieure et débouchant d'une part dans le doseur volumétrique 37 et d'autre part dans l'alésage d'axe 27 ; un alésage vertical de même axe que le conduit 26, surmontant celui- ci et recevant le cylindre 13 du doseur volumétrique 37 ; un conduit vertical 30 situé dans sa partie inférieure et débouchant d'une part dans l'alésage d'axe 27 et d'autre part au-dessus du récipient 39.The body 19 has a horizontal bore of axis 27; a vertical duct 24 located in its upper part and opening on the one hand into the feed hopper 12 and on the other hand into the bore of axis 27; a vertical duct 26 located in its upper part and opening on the one hand into the volumetric metering device 37 and on the other hand into the bore of axis 27; a vertical bore of the same axis as the conduit 26, surmounting the latter and receiving the cylinder 13 of the volumetric metering device 37; a vertical duct 30 situated in its lower part and opening on the one hand into the bore of axis 27 and on the other hand above the container 39.

Le boisseau cylindrique 18 occupe l'alésage vertical d'axe 27 du corps 19, dans lequel il peut pivoter. Il comporte un évidement 15 qui, dans une position déterminée du boisseau 18 par rapport au corps 19, met en communication les conduits 24 et 26 du corps 19 ; un conduit cylindrique 17, sans communication avec l'évidement 15, qui, dans une autre position déterminée du boisseau 18 par rapport au corps 19, met en communication les conduits 26 et 30 du corps 19 ; un levier de commande 20 pour faire pivoter le boisseau 18 à l'intérieur du corps 19. Des moyens électriques, pneumatiques ou équivalents, non représentés sur la figure, agissent sur le levier de commande 20 sur les instructions que leur communique l'organe de calcul et de mise en mémoire.The cylindrical plug 18 occupies the vertical bore of axis 27 of the body 19, in which it can pivot. It comprises a recess 15 which, in a determined position of the plug 18 relative to the body 19, connects the conduits 24 and 26 of the body 19; a cylindrical conduit 17, without communication with the recess 15, which, in another determined position of the plug 18 relative to the body 19, connects the conduits 26 and 30 of the body 19; a control lever 20 for pivoting the plug 18 inside the body 19. Electrical, pneumatic or equivalent means, not shown in the figure, act on the control lever 20 on the instructions that communicates to them the organ for calculation and storage.

Lorsqu'un poste de remplissage se trouve entre les points 10 et 7 du trajet représenté sur la figure 1, le boisseau 18 est positionné de façon que l'évidement 15 soit en regard des conduits 24 et 26 du corps 19 et la trémie d'alimentation 12 et le doseur volumétrique 37 sont en communication (cas de la figure 2). Lorsqu'un poste de remplissage se trouve entre le point 7 et le point d'arrêt du remplissage situé entre les points 8 et 9 du trajet représenté sur la figure 1, le boisseau 18 est positionné de façon que le conduit 17 soit en regard des conduits 26 et 30 du corps 19 et le doseur votumétrique 37 et le récipient 39 sont en communication.When a filling station is located between points 10 and 7 of the path shown in FIG. 1, the plug 18 is positioned so that the recess 15 faces the conduits 24 and 26 of the body 19 and the hopper of supply 12 and the volumetric dispenser 37 are in communication (case of FIG. 2). When a filling station is between point 7 and the filling stop point located between points 8 and 9 of the path shown in Figure 1, the plug 18 is positioned so that the conduit 17 is facing the conduits 26 and 30 of the body 19 and the votumetric dispenser 37 and the container 39 are in communication.

La figure 4 représente une vue développée schématique d'une came commandant le fonctionnement de deux postes de remplissage. Il faut bien concevoir que dans la réalité une telle came n'est pas située dans un plan mais s'enroule sur un cylindre de même centre que le carrousel et qu'elle commande un nombre de postes de remplissage, variable selon les cas, mais bien supérieur à 2.FIG. 4 represents a schematic developed view of a cam controlling the operation of two filling stations. It must be understood that in reality such a cam is not located in a plane but is wound on a cylinder with the same center as the carousel and that it controls a number of filling stations, variable depending on the case, but well above 2.

La came 34 représentée en figure 4 comporte une rampe montante à deux inclinaisons successives : rampe 340 entre les points 10 et 6, rampe 341 entre les points 6 et 7 ; une rampe descendante à deux inclinaisons : rampe 342 entre les points 7 et 8, rampe 343 entre les points 8 et 9 ; une partie horizontale 344 entre les points 9 et 10 (la numérotation de ces points correspond à celle de la figure 1). Le trajet montant correspond au remplissage du doseur volumétrique 37. Le trajet descendant correspond pour une part au transfert du produit du doseur volumétrique 37 dans le récipient 39.The cam 34 shown in FIG. 4 comprises a rising ramp with two successive inclinations: ramp 340 between points 10 and 6, ramp 341 between points 6 and 7; a downward ramp with two inclinations: ramp 342 between points 7 and 8, ramp 343 between points 8 and 9; a horizontal part 344 between points 9 and 10 (the numbering of these points corresponds to that of FIG. 1). The upward path corresponds to the filling of the volumetric dispenser 37. The downward path corresponds in part to the transfer of the product from the volumetric doser 37 into the container 39.

La came 34 est fixe par rapport au carrousel rotatif 3 sur lequel sont installés les postes de remplissage. Elle commande le fonctionnement de chacun d'eux en guidant un galet 32 assujetti à la tige 33 du piston 28, par l'interposition de moyens élastiques 40 fixés d'une part à l'extrémité de la tige 33, d'autre part à un point fixe 41 solidaire du carrousel. Les moyens élastiques 40 travaillent en compression et maintiennent le galet 32 en contact avec la came 34 ce qui permet le guidage du galet 32 par la came sur la rampe descendante de celle-ci. Ils ont une autre fonction : lorsque le récipient 39 est rempli par le poids de produit désiré, l'organe de calcul et de mise en mémoire commande la fermeture de l'orifice de distribution du doseur volumétrique. La course du piston 28 s'en trouve interrompue. Si le galet 32 était guidé le long de la rampe descendante par des moyens rigides, un rail parallèle à la came 34 venant au contact de la partie supérieure du galet, par exemple, des dégâts s'en suivraient. Alors que les moyens élastiques 40, dont la force de compression a été calculée de façon qu'elle soit supérieure à la résistance que rencontre le piston du doseur volumétrique lorsqu'il chasse le produit dans le récipient, mais inférieure à la force résistante exercée sur les moyens élastiques par la tige du piston quand elle est bloquée, absorbent l'excédent de course du piston. Le galet 32 quitte le contact de la rampe descendante de la came au point d'arrêt du remplissage du récipient et reprend contact avec la rampe montante de la came en un point situé dans le même plan horizontal que le point d'arrêt du remplissage du récipient. Naturellement, le guidage du galet 32 par la came 34 avec interposition de moyens élastiques constitue en outre une sécurité pour l'installation de remplissage : le blocage accidentel d'un piston n'entraîne pas de conséquence fâcheuse du fait que le galet peut échapper de la came.The cam 34 is fixed relative to the rotary carousel 3 on which the filling stations are installed. It controls the operation of each of them by guiding a roller 32 secured to the rod 33 of the piston 28, by the interposition of elastic means 40 fixed on the one hand to the end of the rod 33, on the other hand to a fixed point 41 secured to the carousel. The elastic means 40 work in compression and keep the roller 32 in contact with the cam 34 which allows the guide of the roller 32 by the cam on the downward ramp thereof. They have another function: when the container 39 is filled with the desired weight of product, the calculation and storage unit controls the closing of the dispensing orifice of the volumetric dispenser. The stroke of the piston 28 is thereby interrupted. If the roller 32 was guided along the downward ramp by rigid means, a rail parallel to the cam 34 coming into contact with the upper part of the roller, for example, damage would ensue. Whereas the elastic means 40, the compression force of which has been calculated so that it is greater than the resistance encountered by the piston of the volumetric dispenser when it drives the product into the container, but less than the resistant force exerted on the elastic means by the piston rod when it is blocked, absorb the excess travel of the piston. The roller 32 leaves the contact of the descending ramp of the cam at the point of stopping the filling of the container and resumes contact with the rising ramp of the cam at a point situated in the same horizontal plane as the point of stopping the filling of the container. Naturally, the guiding of the roller 32 by the cam 34 with the interposition of elastic means also constitutes security for the filling installation: the accidental blocking of a piston does not cause any unfortunate consequence of the fact that the roller can escape from drug.

Selon une variante de la présente invention on peut modifier le remplissage du doseur volumétrique 37 pour que le point d'arrêt du remplissage du récipient 39 ait lieu entre les points 8 et 9, c'est-à-dire sur la rampe descendante 343, au moment où le débit de remplissage est lent. Sur la figure 4 est représenté un dispositif, permettant la modification du volume admis dans le doseur volumétrique, constitué par une partie de rampe montante 341 de la came 34 à inclinaison réglable, et un motoréducteur 25 actionnant une vis sans fin 16. Lors de la mise en service de l'installation l'inclinaison de la partie de rampe 341 est réglée de façon que le point d'arrêt du remplissage des récipients ait lieu entre les points 8 et 9. L'organe de calcul et de mise en mémoire enregistre les coordonnées du point d'arrêt du remplissage de chaque récipient et contrôle qu'il se trouve sur la partie de rampe 343. Si pour une raison ou pour une autre une dérive se produisait et que le point d'arrêt du remplissage des récipients se rapprochât du point 8 ou du point 9 au-delà de valeurs de consigne déterminées, l'organe de calcul et de mise en mémoire commanderait une modification de l'inclinaison de la partie de rampe 341, vers le haut ou vers le bas selon le sens de la dérive.According to a variant of the present invention, the filling of the volumetric metering device 37 can be modified so that the point of stopping the filling of the container 39 takes place between points 8 and 9, that is to say on the descending ramp 343, when the filling rate is slow. In FIG. 4 is shown a device, allowing the modification of the volume admitted into the volumetric metering device, constituted by a part of an ascending ramp 341 of the cam 34 with adjustable inclination, and a geared motor 25 actuating an endless screw 16. During the commissioning of the installation the inclination of the ramp part 341 is adjusted so that the point of stopping the filling of the containers takes place between points 8 and 9. The calculation and storage unit records the coordinates of the stop point for filling each container and check that it is on the ramp part 343. If for some reason or other a drift occurs and the stop point for filling the containers closer to point 8 or point 9 beyond determined set values, the calculation and storage unit would command a modification of the inclination of the ramp part 341, up or down depending on the sense of drift.

La figure 5 représente un exemple de réalisation de moyens élastiques interposés entre la came 34 et la tige 33 du piston de chaque doseur volumétrique 37. Les moyens élastiques utilisés dans cet exemple sont constitués par un vérin pneumatique comportant un cylindre 44 solidaire du carrousel 3, un piston 43 coulissant dans le cylindre 44, une tige 42 fixée au piston 43 à une extrémité et assujettie au galet 32 à l'autre extrémité. Le vérin pneumatique de chaque poste de remplissage est relié au vérin de tous les autres postes de remplissage et à un volume tampon 46 par une conduite 45.FIG. 5 represents an exemplary embodiment of elastic means interposed between the cam 34 and the rod 33 of the piston of each volumetric metering device 37. The elastic means used in this example consist of a pneumatic cylinder comprising a cylinder 44 secured to the carousel 3, a piston 43 sliding in the cylinder 44, a rod 42 fixed to the piston 43 at one end and secured to the roller 32 at the other end. The pneumatic cylinder of each filling station is connected to the cylinder of all the other filling stations and to a buffer volume 46 by a pipe 45.

La figure 6 représente la vue en coupe d'un autre exemple de réalisation de moyens élastiques interposés entre la came 34 et la tige 33 du piston de chaque doseur volumétrique. Le piston 28 du doseur volumétrique 37 est surmonté d'une partie cylindrique 47 comportant un alésage destiné à guider l'extrémité de la tige 33. La tige 33 comporte une lumière verticale 48. Elle pénètre dans l'alésage de la partie cylindrique 47 où elle peut coulisser verticalement entre deux positions extrêmes définies par la lumière 48, lumière dans laquelle passe une goupille horizontale 50 prise à ses deux extrémités dans la partie cylindrique 47. Sur la tige 33 est fixée en outre par une goupille 51, une bague 49 comportant un épaulement. Un ressort 52 travaillant en compression est disposé entre la bague 49 et le piston 28 selon l'axe de la tige 33. Il prend appui à une extrémité sur la partie supérieure du piston 28, à l'autre extrémité dans l'épaulement de la bague 49, et est guidé par la surface extérieure de la partie cylindrique 33. Avec une telle disposition des moyens élastiques, on peut utiliser, pour guider le galet 32 sur la rampe descendante de la came, un rail rigide parallèle à la came 34 venant au contact de la partie supérieure du galet.Figure 6 shows the sectional view of another embodiment of elastic means interposed between the cam 34 and the rod 33 of the piston of each volumetric metering device. The piston 28 of the volumetric metering device 37 is surmounted by a cylindrical part 47 comprising a bore intended to guide the end of the rod 33. The rod 33 comprises a vertical slot 48. It enters the bore of the cylindrical part 47 where it can slide vertically between two extreme positions defined by light 48, light in which passes a horizontal pin 50 taken at its two ends in the cylindrical part 47. On the rod 33 is further fixed by a pin 51, a ring 49 having a shoulder. A spring 52 working in compression is disposed between the ring 49 and the piston 28 along the axis of the rod 33. It bears at one end on the upper part of the piston 28, at the other end in the shoulder of the ring 49, and is guided by the external surface of the cylindrical part 33. With such an arrangement of elastic means, it is possible to use, to guide the roller 32 on the descending ramp of the cam, a rigid rail parallel to the cam 34 coming from in contact with the upper part of the roller.

Claims (8)

1. A method for monitoring and controlling the filling of receptacles comprising the following steps of : engaging successively empty receptacles in a filling installation comprising a rotary carrousel type member (3) having a plurality of filling stations, weighing each receptacle while it is still empty, carrying out the filling of each receptacle while comparing its weight to a set value, by means of a balance (36) moving with each filling station, and stopping the filling by the closure of an outlet orifice when the set value is reached, characterized in that the filling is carried out according the following steps of : filling a volumetric dispenser (37) associated with each filling station with a volume of material whose weight is sligthly higher than the set value, and transferring the material from the volumetric dispenser into the receptacle by actuating a control member, the abnormal forces resulting from the closure of the outlet orifice before the flow of the total volume of material initially inserted in the volumetric dispenser being taken up by resilient means (40) interposed between the control member and the volumetric dispenser.
2. Method for monitoring and controlling the filling of receptacles according to claim 1 wherein the rate of filling is fast in a first phase, slower in a second phase, the first phase having a predetermined duration characterized in that the position of the filling stop point of a receptacle on the filling path is used to modify if necessary, the volume of material to be introduced into the volumetric dispenser (37) of a filling station of a subsequent receptacle so that the filling of this latter ends during the phase where the rate of filling is slow.
3. Device for monitoring controlling the filling of receptacles engaged successively in a filling installation comprising a rotary carrousel type member (3) having a plurality of filling stations, each filling station including filling means and a balance (36) that moves with the station, the installation comprising moreover, a calculation and a storage unit for carrying out the taring of a receptacle, comparing the weight of the receptacle to a set value while the filling continues, and controlling the stopping of the filling by the closure of an outlet orifice when the weight of the content of the receptacle reaches the set value, characterized in that the filling means comprise, a volumetric dispenser (37) for receiving a determined volume of material having a excess of weight relative to the set value, on a first path of the carrousel and transferring a part of this volume in a receptacle on a second path of the carrousel, the installation comprising, further, a control member for controlling the filling of each volumetric dispenser (37) during the first path of the carrousel and the transfer of a part of its content in a receptacle during the second path of the carrousel and resilient means (40) interposed between the control member and the volumetric dispenser (37) to take up the abnormal forces resulting from the closure of the outlet orifice of the volumetric dispenser before the flow of the total volume of material which has been initially inserted.
4. Device for monitoring and controlling the filling of receptacles according to claim 3, wherein the control member includes means for controlling the transfer of the material from the volumetric dispenser into the receptacle initially at high speed on the first portion of the second path of the carrousel, and then at low speed on the second portion of the second path of the carrousel, characterized in that it includes means for actuating the control member dependent on the filling stop point of the receptacle on the second portion of the second path of the carrousel.
5. Device for monitoring and controlling the filling of receptacles according to claim 3 or 4, characterized in that the volumetric dispenser is a cylinder (13) with a piston (28) and the control member a cam (34) acting on the stroke of the cylinder.
6. Device for monitoring and controlling the filling of receptacles according to claims 4 and 5 wherein the portion of the cam corresponding to the second path of the carrousel has two successive slopes (342, 343) characterized in that the cam (34) includes at least a moving member (341) for modifying the stroke of the piston (28) of the cylinder (13) of the volumetric dispenser (37) and thus its volume.
7. Device for monitoring and controlling the filling of receptacles according to claim 3, characterized in that the resilient means interposed between each volumetric dispenser and the control member are springs (52).
8. Device for monitoring and controlling the filling of receptacles according to claim 3, characterized in that the resilient means interposed between each volumetric dispenser (37) and the control member are pneumatic actuators connected by a duct (45) to a buffer volume (46).
EP84402269A 1983-11-18 1984-11-09 Method and device for checking and controlling the filling of a series of containers by a given weight of a product having a variable volumetric weight Expired EP0143692B1 (en)

Priority Applications (1)

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AT84402269T ATE33469T1 (en) 1983-11-18 1984-11-09 METHOD AND APPARATUS FOR MONITORING AND CONTROLLING THE FILLING OF A SERIES OF CONTAINERS OF A DETERMINED WEIGHT OF A PRODUCT OF ALTERNATING VOLUMETRIC WEIGHT.

Applications Claiming Priority (2)

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FR8318417 1983-11-18
FR8318417A FR2555132B1 (en) 1983-11-18 1983-11-18 METHOD FOR FILLING A CONTAINER WITH A SPECIFIED QUANTITY OF PRODUCT

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EP (1) EP0143692B1 (en)
JP (1) JPH0627662B2 (en)
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CA (1) CA1232883A (en)
DE (1) DE3470401D1 (en)
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FR2555132B1 (en) 1986-03-28
JPS60155927A (en) 1985-08-16
CA1232883A (en) 1988-02-16
FR2555132A1 (en) 1985-05-24
JPH0627662B2 (en) 1994-04-13
ATE33469T1 (en) 1988-04-15
EP0143692A1 (en) 1985-06-05
DE3470401D1 (en) 1988-05-19
ES537739A0 (en) 1985-10-16
BR8405869A (en) 1985-09-17
ES8601046A1 (en) 1985-10-16
ZA848851B (en) 1985-06-26
US4635688A (en) 1987-01-13

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