EP0776314A1 - Method of filling containers with liquid under pressure - Google Patents

Method of filling containers with liquid under pressure

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Publication number
EP0776314A1
EP0776314A1 EP96916004A EP96916004A EP0776314A1 EP 0776314 A1 EP0776314 A1 EP 0776314A1 EP 96916004 A EP96916004 A EP 96916004A EP 96916004 A EP96916004 A EP 96916004A EP 0776314 A1 EP0776314 A1 EP 0776314A1
Authority
EP
European Patent Office
Prior art keywords
filling
liquid
pressure
control device
filling valve
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.)
Granted
Application number
EP96916004A
Other languages
German (de)
French (fr)
Other versions
EP0776314B1 (en
Inventor
Detlef Boertz
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0776314A1 publication Critical patent/EP0776314A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B67OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67CCLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
    • B67C3/00Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
    • B67C3/02Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
    • B67C3/20Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus with provision for metering the liquids to be introduced, e.g. when adding syrups
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B67OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67CCLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
    • B67C3/00Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
    • B67C3/02Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
    • B67C3/20Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus with provision for metering the liquids to be introduced, e.g. when adding syrups
    • B67C3/202Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus with provision for metering the liquids to be introduced, e.g. when adding syrups by weighing

Definitions

  • the invention is based on a method for filling containers with a pressurized liquid according to the preamble of claim 1.
  • a method for filling containers with a pressurized liquid according to the preamble of claim 1.
  • Such a method has already become known from JP 10 46 392 B4.
  • the liquid pressure is measured once after opening a filling valve, whereupon a control device calculates a filling time or opening time for the filling valve for a specific filling quantity on the basis of the measured liquid pressure.
  • a disadvantage of the known method is that pressure fluctuations occurring during the filling process, which lead to a change in the flow rate at the filling valve, are not taken into account. Furthermore, the filling quantities are not taken into account during the opening and closing process of the filling valve. The accuracy of the known filling method is therefore limited.
  • the inventive method for filling containers with a pressurized liquid with the characterizing features of claim 1 has the advantage that it works very precisely. This is achieved according to the invention in that the liquid pressure is continuously measured during the filling process, so that pressure fluctuations that occur are taken into account. Furthermore, the flow can psychrned of the opening and closing operation detected the filling valve, and in which the filling volumes B ALCULATION be considered. Further advantages and advantageous developments of the method according to the invention for filling containers with a liquid under pressure result from the subclaims and the description.
  • the filling machine shown in FIG. 1 for dosing and filling a liquid into packaging container 10 has a conveying device 11 with which packaging containers 10, such as ampoules or vials, are fed to treatment stations arranged one behind the other.
  • the conveyor 11 has a transport screw 12 for the cyclical or continuous transport of the packaging container 10.
  • the packaging containers 10 stand and slide on rail sections 13 to 15. Between the rail sections 13 and 14 or 14 and 15, a weighing device 17, 18, which can be controlled via a discharge device 16, is arranged for each packaging container 10, of which one 17 the tare weight Eq, and the other 18 detects the gross weight G2 of the packaging container 10 and supplies it to a control device 19 as an input variable.
  • control device 19 for example, product-specific data, such as the viscosity profile of the liquid over the temperature and data of the device, are stored.
  • An input / output unit 20 is connected to the control device 19, via which in particular one Desired filling quantity M or a desired filling weight of the packaging container 10 can be entered into the control device 19.
  • the filling device 22 comprises a number of filling heads 23, for example six, corresponding to the number of packaging containers 10 to be filled per conveying cycle, each of which has a hollow filling needle 24 which can be moved up and down.
  • Each filling head 23 is coupled to a metering valve 25 for the liquid, wherein all metering valves 25 can be controlled synchronously by the control device 19 together.
  • the metering valves 25 are connected via short lines 26 to a common, tubular distributor 30 in which a liquid pressure Pl prevails.
  • the distributor 30 is in turn connected via a line 33 and a quick release device 34 to a storage container 35 for the liquid.
  • the pressure drop between the distributor 30, which is completely filled with the liquid, and the individual metering valves 25 is always the same, for example due to an arrangement of the metering valves 25 at the same vertical distance from the distributor 30, and is stored in the control device 10 as a factor.
  • the storage container 35 advantageously contains the amount of liquid that is required during a production shift to fill the packaging containers 10. The result of this is that the filling level in the storage container 35 only decreases to a very small extent in each filling cycle.
  • the reservoir 35 is pressurized with a gas pressure P2 via a pressure line 36.
  • the pressure P2 generally enables a higher pressure of the liquid at the metering valves 25, and thus a high outflow rate from the storage container 35, which promotes the flow behavior in particular in the case of highly viscous liquids.
  • a temperature sensor 31 for detecting a liquid temperature T and a pressure sensor 32 for are in the distributor 30
  • the two sensors 31, 32 are also connected to the control device 19.
  • the liquid pressure Pl continuously at certain time intervals ⁇ t, for example every 150 ⁇ sec. until every 250 ⁇ sec. measured, and the control device 19 is supplied as an input variable.
  • the duration of the time intervals .DELTA.t between the individual measurements of the liquid pressure Pl should be chosen so that 25 liquid pressures Pl are detected even during the opening and closing process of the metering valves and are forwarded to the control device 19. For these reasons, there has been a value for ⁇ t of 200 ⁇ sec. proven that ensures sufficient resolution even during the opening and closing process of the filling valves 25.
  • the device described above works as follows: The packaging containers 10 are fed by the conveyor screw 21 to the filling device 22 in cycles. As soon as a packaging container 10 under its assigned Filling head 23 is positioned, the filling needles 24 of the filling heads 23 are lowered and inserted into the packaging container 10. At the same time, the control device 19 initiates the filling of the desired filling quantity M into the packaging container 10 by a corresponding control signal Z to the metering valves 25, ie the control signal Z causes, for example, energization of a coil in the metering valve 25 so that its needle lifts off the valve seat.
  • the calculation of the filled quantity M (ist), and thus the duration of the control signal Z to the metering valves 25, is carried out by the control device 19 continuously calculating partial volumes ⁇ M and adding them up during the duration of the control signal Z.
  • the partial volumes ⁇ M are calculated from the time intervals ⁇ t between the individual measurements of the liquid pressures Pl, the value of the liquid pressure of Pl supplied to the control device 19, and a functional relationship k (pl) stored in the control device 19 between the respective value of Pl and the result thereof in the metering valves 25 resulting flow rate per unit time.
  • the control device 19 thus calculates the filling quantity M (actual) filled into a container 10 according to the following formula:
  • this limit value M (max) which causes the control signal Z to end, is the desired filling quantity M itself.
  • the limit value M (max) stored in the control device 19 can be corresponding to the However, the closing characteristics of the filling valves 25 can also be selected to be smaller, so that, for example, the filling quantity or the partial volumes ⁇ M that enter the containers 10 during the closing process (after the control signal Z has failed) of the metering valves 25 are also taken into account. This means that in this case the limit value M (max) is smaller than the target filling quantity M.
  • the accuracy of the partial volume calculation ⁇ M of the control device 19 is increased by taking into account the temperature T of the liquid detected by the temperature sensor 31. This is achieved in that the flow / viscosity characteristics for the respective liquid are stored in the control device 19, so that the corresponding temperature-corrected functional relationship k is additionally accessed for calculating the individual partial volumes ⁇ M, i.e. that the value of the factor k also depends on the temperature [k (Pl, T)].
  • the filling needles 24 are lifted out of the packaging containers 10 again by the filling heads 23.
  • the packaging containers 10 are then conveyed by the screw conveyor 12 to another processing station, for example a closing station, in cycles. At the same time, the process is repeated as described above for packaging containers 10 that are newly conveyed into the filling machine.
  • Packaging container 10 from the control device 19 to determine a correspondingly corrected control signal Z for the metering valves 25.

Landscapes

  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
  • Basic Packing Technique (AREA)

Abstract

A filling machine for filling containers (10) with liquid is provided with one filling valve (25) for each container (10), the filling valve being operated by a control device (19) by means of a drive pulse (Z). To improve the accuracy of the quantity of fluid (M (ist)) actually transferred to the containers (10) with reference to a notional filling quantity (M), it is proposed that the control device (19) should sum partial volumes ( DELTA M) determined from measured pressures (P1) of the fluid, time intervals ( DELTA t) between individual pressure readings and a pressure/through-flow characteristic curve of the filling valves (25). Once the sum of the partial volumes ( DELTA M) has passed a threshold filling quantity (M (max)), the control unit (19) stops the drive pulse (Z).

Description

Verfahren zum Befüllen von Behältern mit einer unter Druck stehenden Flüssigkeit Procedure for filling containers with a pressurized liquid
Stand der TechnikState of the art
Die Erfindung geht aus von einem Verfahren zum Befüllen von Behältern mit einer unter Druck stehenden Flüssigkeit nach der Gattung des Anspruchs 1. Aus der JP 10 46 392 B4 ist bereits ein derartiges Verfahren bekannt geworden. Bei diesem Verfahren wird der Flüssigkeitsdruck nach dem Öffnen eines Füllventils einmalig gemessen, worauf eine Steuereinrichtung aufgrund des gemessenen Flüssigkeitsdruckes eine Füllzeit bzw. Öffnungszeit für das Füllventil für eine bestimmte Füllmenge berechnet.The invention is based on a method for filling containers with a pressurized liquid according to the preamble of claim 1. Such a method has already become known from JP 10 46 392 B4. In this method, the liquid pressure is measured once after opening a filling valve, whereupon a control device calculates a filling time or opening time for the filling valve for a specific filling quantity on the basis of the measured liquid pressure.
Nachteilig bei dem bekannten Verfahren ist, daß während des Füllvorganges auftretende Druckschwankungen, die zu einer Änderung der Durchflußmenge an dem Füllventil führen, nicht berücksichtigt werden. Weiterhin bleiben auch die Füllmengen während des Offnungs- und Schließvorganges des Füllventils unberücksichtigt. Die Genauigkeit des bekannten Füllverfahrens ist daher beschränkt.A disadvantage of the known method is that pressure fluctuations occurring during the filling process, which lead to a change in the flow rate at the filling valve, are not taken into account. Furthermore, the filling quantities are not taken into account during the opening and closing process of the filling valve. The accuracy of the known filling method is therefore limited.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Verfahren zum Befüllen von Behältern mit einer unter Druck stehenden Flüssigkeit mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß es sehr genau arbeitet. Dies wird erfindungsgemäß dadurch erreicht, daß der Flüssigkeitsdruck während des Abfüllvorganges ständig gemessen wird, so daß auftretende Druckschwankungen berücksichtigt werden. Weiterhin können auch die Durchflußmengen währned des Offnungs- und Schließvorganges des Füllventils erfaßt, und bei der Berechnung der Füllvolumina berücksichtigt werden. Weitere Vorteile und vorteilhafte Weiterbildungen des erfindungsgemäßen Verfahrens zum Befüllen von Behältern mit einer unter Druck stehenden Flüssigkeit ergeben sich aus den Unteransprüchen und der Beschreibung.The inventive method for filling containers with a pressurized liquid with the characterizing features of claim 1 has the advantage that it works very precisely. This is achieved according to the invention in that the liquid pressure is continuously measured during the filling process, so that pressure fluctuations that occur are taken into account. Furthermore, the flow can währned of the opening and closing operation detected the filling valve, and in which the filling volumes B ALCULATION be considered. Further advantages and advantageous developments of the method according to the invention for filling containers with a liquid under pressure result from the subclaims and the description.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Die einzige Figur 1 zeigt eine Füllmaschine in einer schematischen Darstellung.An embodiment of the invention is shown in the drawing and is explained in more detail in the following description. The only Figure 1 shows a filling machine in a schematic representation.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Die in der Figur 1 dargestellte Füllmaschine zum Dosieren und Abfüllen einer Flüssigkeit in Verpackungsbehälter 10 hat eine Fördereinrichtung 11, mit der Verpackungsbehälter 10, wie beispielsweise Ampullen oder Vials, hintereinander angeordneten Behandlungsstationen zugeführt werden. Die Fördereinrichtung 11 weist eine Transportschnecke 12 zum taktweisen oder kontinuierlichen Transport der Verpackungsbehälter 10 auf. Die Verpackungsbehälter 10 stehen und gleiten auf Schienenstücken 13 bis 15. Zwischen den Schienenstücken 13 und 14 beziehungsweise 14 und 15 ist jeweils eine über eine Ausschleußeinrichtung 16 ansteuerbare Wägeeinrichtung 17, 18 für jeweils einen Verpackungsbehälter 10 angeordnet, von denen die eine 17 das Tara-Gewicht Gl, und die andere 18 das Brutto-Gewicht G2 der Verpackungsbehälter 10 erfaßt und einer Steuereinrichtung 19 als Eingangsgröße zuführt.The filling machine shown in FIG. 1 for dosing and filling a liquid into packaging container 10 has a conveying device 11 with which packaging containers 10, such as ampoules or vials, are fed to treatment stations arranged one behind the other. The conveyor 11 has a transport screw 12 for the cyclical or continuous transport of the packaging container 10. The packaging containers 10 stand and slide on rail sections 13 to 15. Between the rail sections 13 and 14 or 14 and 15, a weighing device 17, 18, which can be controlled via a discharge device 16, is arranged for each packaging container 10, of which one 17 the tare weight Eq, and the other 18 detects the gross weight G2 of the packaging container 10 and supplies it to a control device 19 as an input variable.
In der Steuereinrichtung 19 sind beispielsweise produktspezifische Daten, wie der Viskositätsverlauf der Flüssigkeit über der Temperatur sowie Daten der Vorrichtung abgespeichert. Mit der Steuereinrichtung 19 ist eine Ein- /Ausgabeeinheit 20 verbunden, über die insbesondere eine Sollfüllmenge M bzw. ein Sollfüllgewicht der Verpackungsbehälter 10 an die Steuereinrichtung 19 eingegeben werden kann.In the control device 19, for example, product-specific data, such as the viscosity profile of the liquid over the temperature and data of the device, are stored. An input / output unit 20 is connected to the control device 19, via which in particular one Desired filling quantity M or a desired filling weight of the packaging container 10 can be entered into the control device 19.
Oberhalb der Fördereinrichtung 11 ist im Bereich desAbove the conveyor 11 is in the area of
Schienenstücks 14 eine Abfülleinrichtung 22 angeordnet. Die Abfülleinrichtung 22 umfaßt bei einem taktweisen Transport der Verpackungsbehälter 10 eine der Zahl der pro Fördertakt zu füllenden Verpackungsbehälter 10 entsprechende Anzahl von Abfüllköpfen 23, beispielsweise sechs, die jeweils eine auf- und abbewegbare hohle Füllnadel 24 haben. Jeder Abfüllkopf 23 ist mit je einem Dosierventil 25 für die Flüssigkeit gekoppelt, wobei alle Dosierventile 25 von der Steuereinrichtung 19 gemeinsam synchron ansteuerbar sind. Die Dosierventile 25 sind über kurze Leitungen 26 mit einem gemeinsamen, rohrförmigen Verteiler 30 verbunden, in dem ein Flüssigkeitsdruck Pl herrscht. Der Verteiler 30 ist seinerseits über eine Leitung 33 und eine Schnellspanneinrichtung 34 mit einem Vorratsbehälter 35 für die Flüssigkeit verbunden. Das Druckgefälle zwischen dem mit der Flüssigkeit vollständig gefüllten Verteiler 30 und den einzelnen Dosierventilen 25 ist beispielsweise durch eine Anordnung der Dosierventile 25 in gleichem vertikalen Abstand zum Verteiler 30 stets gleich groß, und in der Steuereinrichtung 10 als Faktor abgespeichert.Rail piece 14 a filling device 22 is arranged. In a cyclical transport of the packaging containers 10, the filling device 22 comprises a number of filling heads 23, for example six, corresponding to the number of packaging containers 10 to be filled per conveying cycle, each of which has a hollow filling needle 24 which can be moved up and down. Each filling head 23 is coupled to a metering valve 25 for the liquid, wherein all metering valves 25 can be controlled synchronously by the control device 19 together. The metering valves 25 are connected via short lines 26 to a common, tubular distributor 30 in which a liquid pressure Pl prevails. The distributor 30 is in turn connected via a line 33 and a quick release device 34 to a storage container 35 for the liquid. The pressure drop between the distributor 30, which is completely filled with the liquid, and the individual metering valves 25 is always the same, for example due to an arrangement of the metering valves 25 at the same vertical distance from the distributor 30, and is stored in the control device 10 as a factor.
In dem Vorratsbehälter 35 befindet sich vorteilhafterweise die Menge an Flüssigkeit, die während einer Produktionsschicht zur Abfüllung der Verpackungsbehalter 10 benötigt wird. Dadurch ergibt sich, daß die Füllhöhe im Vorratsbehälter 35 bei jedem Abfüllzyklus nur in sehr geringem Maße abnimmt. Der Vorratsbehälter 35 ist über eine Druckleitung 36 mit einem Gasdruck P2 beaufschlagt.The storage container 35 advantageously contains the amount of liquid that is required during a production shift to fill the packaging containers 10. The result of this is that the filling level in the storage container 35 only decreases to a very small extent in each filling cycle. The reservoir 35 is pressurized with a gas pressure P2 via a pressure line 36.
Vorteilhafterweise besteht dabei eine Beeinflussung zwischen den Drücken Pl und P2, so daß P2 beispielsweise von der Steuereinrichtung 19 so geregelt wird, daß sich stets ein Druck Pl einstellt, dessen Toleranz zum Beispiel +/- 0,05 bar beträgt. Somit können verschiedene Anordnungen des Vorratsbehälters 35 an der Füllmaschine sowie ein sinkender Flüssigkeitsspiegel in dem Vorratsbehälter 35 ausgeglichen werden.Advantageously, there is an influence between the pressures P1 and P2, so that P2, for example, from the Control device 19 is regulated so that a pressure Pl is always set, the tolerance of which is, for example, +/- 0.05 bar. Different arrangements of the storage container 35 on the filling machine and a falling liquid level in the storage container 35 can thus be compensated for.
Durch den Druck P2 wird generell ein höherer Druck der Flüssigkeit an den Dosierventilen 25, und damit eine große Abflußgeschwindigkeit aus dem Vorratsbehälter 35 ermöglicht, was insbesondere bei hochviskosen Flüssigkeiten das Fließverhalten begünstigt.The pressure P2 generally enables a higher pressure of the liquid at the metering valves 25, and thus a high outflow rate from the storage container 35, which promotes the flow behavior in particular in the case of highly viscous liquids.
Im Verteiler 30 sind ein Temperatursensor 31 zur Erfassung einer Flüssigkeitstemperatur T und ein Drucksensor 32 zurA temperature sensor 31 for detecting a liquid temperature T and a pressure sensor 32 for are in the distributor 30
Erfassung des Flüssigkeitsdruckes Pl angeordnet. Die beiden Sensoren 31, 32 sind ebenfalls mit der Steuereinrichtung 19 verbunden.Detection of the liquid pressure Pl arranged. The two sensors 31, 32 are also connected to the control device 19.
Wesentlich ist, daß insbesondere der Flüssigkeitsdruck Pl kontinuierlich in bestimmten Zeitabständen Δt, beispielsweise alle 150 μsec. bis alle 250 μsec. gemessen, und der Steuereinrichtung 19 als Eingangsgröße zugeführt wird. Die Dauer der Zeitabstände Δt zwischen den einzelnen Messungen des Flüssigkeitsdruckes Pl sollte so gewählt werden, daß auch während des Offnungs- und Schließvorganges der Dosierventile 25 Flüssigkeitsdrücke Pl erfaßt, und an die Steuereinrichtung 19 weitergeleitet werden. Aus diesen Gründen hat sich ein Wert für Δt von 200 μsec. bewährt, der eine ausreichende Auflösung auch während des Offnungs- und Schließvorganges der Füllventile 25 gewährleistet.It is essential that in particular the liquid pressure Pl continuously at certain time intervals Δt, for example every 150 μsec. until every 250 μsec. measured, and the control device 19 is supplied as an input variable. The duration of the time intervals .DELTA.t between the individual measurements of the liquid pressure Pl should be chosen so that 25 liquid pressures Pl are detected even during the opening and closing process of the metering valves and are forwarded to the control device 19. For these reasons, there has been a value for Δt of 200 μsec. proven that ensures sufficient resolution even during the opening and closing process of the filling valves 25.
Die oben beschriebene Vorrichtung arbeitet wie folgt: Die Verpackungsbehälter 10 werden von der Transportschnecke 21 der Abfülleinrichtung 22 taktweise zugefördert. Sobald je ein Verpackungsbehälter 10 unter seinem zugeordneten Abfüllkopf 23 positioniert ist, werden die Füllnadeln 24 der Abfüllköpfe 23 abgesenkt und in die Verpackungsbehälter 10 eingeführt. Gleichzeitig wird durch ein entsprechendes Ansteuersignal Z an die Dosierventile 25 durch die Steuereinrichtung 19 das Abfüllen der Sollfüllmenge M in die Verpackungsbehälter 10 eingeleitet, d.h. das Ansteuersignal Z bewirkt beispielsweise eine Bestromung einer Spule im Dosierventil 25, so daß dessen Nadel vom Ventilsitz abhebt.The device described above works as follows: The packaging containers 10 are fed by the conveyor screw 21 to the filling device 22 in cycles. As soon as a packaging container 10 under its assigned Filling head 23 is positioned, the filling needles 24 of the filling heads 23 are lowered and inserted into the packaging container 10. At the same time, the control device 19 initiates the filling of the desired filling quantity M into the packaging container 10 by a corresponding control signal Z to the metering valves 25, ie the control signal Z causes, for example, energization of a coil in the metering valve 25 so that its needle lifts off the valve seat.
Die Berechnung der abgefüllten Füllmenge M (ist) , und somit die Dauer des Ansteuersignales Z an die Dosierventile 25 erfolgt dadurch, daß von der Steuereinrichtung 19 fortlaufend Teilvolumina ΔM berechnet und während der Dauer des Ansteuersignales Z aufsummiert werden. Die Teilvolumina ΔM berechnen sich aus den Zeitabständen Δt zwischen den einzelnen Messungen der Flüssigkeitsdrücke Pl, dem jeweils der Steuereinrichtung 19 zugeführten Wert des Flüssigkeitsdruckes von Pl, sowie einem in der Steuereinrichtung 19 abgelegten Funktionszusammenhang k (pl) zwischen dem jeweiligen Wert von Pl und der daraus in den Dosierventilen 25 resultierenden Durchflußmenge pro Zeiteinheit.The calculation of the filled quantity M (ist), and thus the duration of the control signal Z to the metering valves 25, is carried out by the control device 19 continuously calculating partial volumes ΔM and adding them up during the duration of the control signal Z. The partial volumes ΔM are calculated from the time intervals Δt between the individual measurements of the liquid pressures Pl, the value of the liquid pressure of Pl supplied to the control device 19, and a functional relationship k (pl) stored in the control device 19 between the respective value of Pl and the result thereof in the metering valves 25 resulting flow rate per unit time.
Die Steuereinrichtung 19 berechnet die in einen Behälter 10 abgefüllte Füllmenge M (ist) somit gemäß folgender Formel:The control device 19 thus calculates the filling quantity M (actual) filled into a container 10 according to the following formula:
M (ist) = ∑ ΔM = ∑ (Pl * Δt * k)M (is) = ∑ ΔM = ∑ (Pl * Δt * k)
Überschreitet M (ist) , d.h. die Summe der Teilvolumina ΔM einen bestimmten Grenzwert M (max) , so wird dasExceeds M (is), i.e. the sum of the partial volumes ΔM a certain limit value M (max), that is
Ansteuersignal Z für die Dosierventile 25 durch die Steuereinrichtung 19 gestoppt, und die Dosierventile 25 schließen. Dieser Grenzwert M (max) , der das Beenden des Ansteuersignales Z bewirkt, ist im einfachsten Fall die Sollfüllmenge M selbst. Der in der Steuereinrichtung 19 abgelegte Grenzwert M (max) kann entsprechend der Schließcharakteristik der Füllventile 25 jedoch auch kleiner gewählt werden, so daß beispielsweise auch noch die Füllmenge bzw. die Teilvolumina ΔM berücksichtigt werden, die während des Schließvorganges (nach Ausbleiben des Ansteuersignales Z) der Dosierventile 25 in die Behälter 10 gelangt. Das bedeutet, daß in diesem Fall der Grenzwert M (max) kleiner als die Sollfüllmenge M ist.Control signal Z for the metering valves 25 stopped by the control device 19 and the metering valves 25 close. In the simplest case, this limit value M (max), which causes the control signal Z to end, is the desired filling quantity M itself. The limit value M (max) stored in the control device 19 can be corresponding to the However, the closing characteristics of the filling valves 25 can also be selected to be smaller, so that, for example, the filling quantity or the partial volumes ΔM that enter the containers 10 during the closing process (after the control signal Z has failed) of the metering valves 25 are also taken into account. This means that in this case the limit value M (max) is smaller than the target filling quantity M.
Die Genauigkeit der Teilvoluminaberechnung ΔM der Steuereinrichtung 19 wird durch die Berücksichtigung der vom Temperatursensor 31 erfaßten Temperatur T der Flüssigkeit erhöht. Dies wird dadurch erreicht, daß in der Steuereinrichtung 19 die Durchfluß/Viskositätskennlinien für die jeweilige Flüssigkeit abgespeichert sind, so daß zur Berechnung der einzelnen Teilvolumina ΔM zusätzlich auf den entsprechenden temperaturkorrigierten FunktionsZusammenhang k zugegriffen wird, d.h. , daß der Wert des Faktors k auch von der Temperatur abhängig ist [k(Pl, T)].The accuracy of the partial volume calculation ΔM of the control device 19 is increased by taking into account the temperature T of the liquid detected by the temperature sensor 31. This is achieved in that the flow / viscosity characteristics for the respective liquid are stored in the control device 19, so that the corresponding temperature-corrected functional relationship k is additionally accessed for calculating the individual partial volumes ΔM, i.e. that the value of the factor k also depends on the temperature [k (Pl, T)].
Nachdem die Sollfüllmenge M in die Verpackungsbehälter 10 eingebracht ist werden die Füllnadeln 24 durch die Abfüllköpfe 23 wieder aus den Verpackungsbehältern 10 herausgehoben. Anschließend werden die Verpackungsbehälter 10 durch die Förderschnecke 12 taktweise einer anderen Bearbeitungsstation, beispielsweise einer Verschließstation, zugefördert. Gleichzeitig wiederholt sich für neu in die Füllmaschine geförderte Verpackungsbehälter 10 der Vorgang wie oben beschrieben.After the desired filling quantity M has been introduced into the packaging container 10, the filling needles 24 are lifted out of the packaging containers 10 again by the filling heads 23. The packaging containers 10 are then conveyed by the screw conveyor 12 to another processing station, for example a closing station, in cycles. At the same time, the process is repeated as described above for packaging containers 10 that are newly conveyed into the filling machine.
Um die exakte Dosierung der Flüssigkeitsmenge und damit der Sollfüllmenge M durch die Fύllmaschine zu kontrollieren bzw. zu regeln, werden stichprobenartig über die Ausschleußeinrichtungen 16 einzelne Verpackungsbehälter 10 entnommen und den Wägeeinrichtungen 17, 18 zugeführt. Die tatsächlich dosierte Flüssigkeitsmenge M (ist) wird von der Steuereinrichtung 19 als Differenz des Brutto-Gewichts G2 und des Tara-Gewichts Gl errechnet. Dabei ist es mit Hilfe der sogenannten statistischen Prozeßkontrolle (SPC) möglich, beim Unter- oder Überschreiten von definierten Eingriffsgrenzen, beispielsweise der Flüssigkeitsmenge M (ist) , aber auch des Tara-Gewichts Gl derIn order to control or regulate the exact metering of the quantity of liquid and thus the target filling quantity M by the filling machine, individual packaging containers 10 are removed at random from the discharge devices 16 and fed to the weighing devices 17, 18. The actually metered amount of liquid M (actual) is calculated by the control device 19 as the difference in the gross weight G2 and the tare weight Gl is calculated. It is possible with the help of the so-called statistical process control (SPC), when falling below or exceeding defined intervention limits, for example the amount of liquid M (ist), but also the tare weight Gl der
Verpackungsbehälter 10, von der Steuereinrichtung 19 ein entsprechend korrigiertes Ansteuersignal Z für die Dosierventile 25 zu ermitteln.Packaging container 10, from the control device 19 to determine a correspondingly corrected control signal Z for the metering valves 25.
Ergänzend wird erwähnt, daß es prinzipiell genügt, den Wert des Flüssigkeitsdruckes Pl nur während des eigentlichen Füllvorganges zu erfassen. In der Regel und für Kontrollzwecke bei etwaigen Funktionsstörungen der Füllmaschine wird der Flüssigkeitsdruck Pl jedoch ständig gemessen und der Steuereinrichtung 19 zugeführt.In addition, it is mentioned that it is sufficient in principle to record the value of the liquid pressure Pl only during the actual filling process. As a rule and for control purposes in the event of any malfunctions in the filling machine, however, the liquid pressure Pl is continuously measured and fed to the control device 19.
Darüber hinaus ist es auch denkbar, die Zeitabstände Δt so groß zu wählen, daß der Offnungs- und Schließvorgang der Dosierventile 25 in bezug auf die Teilvolumina ΔM nicht mehr exakt berücksichtigt wird, und in diesem Fall für das Öffnen und Schließen der Dosierventile 25 feste Teilvolumina ΔM (fest) (entsprechend der Dosierventilcharakteristik) anzunehmen. Selbst in diesem Fall ist die Genauigkeit gegenüber bekannten Füllverfahren verbessert, da Druckschwankungen während des eigentlichen Abfüllens berücksichtigt werden. In addition, it is also conceivable to choose the time intervals .DELTA.t so large that the opening and closing process of the metering valves 25 with respect to the partial volumes .DELTA.M is no longer exactly taken into account, and in this case for the opening and closing of the metering valves 25 fixed partial volumes ΔM (fixed) (according to the metering valve characteristics). Even in this case, the accuracy compared to known filling methods is improved, since pressure fluctuations are taken into account during the actual filling.

Claims

Ansprüche Expectations
1. Verfahren zum Befüllen von Behältern (10) mit einer unter Druck (Pl) stehenden Flüssigkeit, bei der die Flüssigkeit aus einem Vorratsbehälter (35) mittels jeweils einem1. A method for filling containers (10) with a liquid (P1) under pressure, in which the liquid from a storage container (35) by means of one
Füllventil (25) dem jeweiligen Behälter (10) zugeführt wird, wobei der Druck (Pl) der Flüssigkeit gemessen, und einer Steuereinrichtung (19) zugeleitet wird, welche aus dem gemessenen Druck (Pl) der Flüssigkeit und der abzufüllenden Sollfüllmenge (M) das Füllventil (25) mittels einesFilling valve (25) is fed to the respective container (10), the pressure (Pl) of the liquid being measured, and being fed to a control device (19) which consists of the measured pressure (Pl) of the liquid and the desired filling quantity (M) to be filled Filling valve (25) by means of a
Ansteuersignales (Z) ansteuert, dadurch gekennzeichnet, daß der Druck (Pl) der Flüssigkeit kontinuierlich in bestimmten Zeitabständen (Δt) während des Füllvorganges durch das Füllventil (25) gemessen wird, daß die Steuereinrichtung (19) die tatsächlich abgefüllte Füllmenge (M (ist)) aus einer Aufsummierung von Teilvolumina (ΔM) berechnet, welche sich unter Berücksichtigung des jeweils gemessenen Drucks (Pl) der Flüssigkeit, den Zeitabständen (Δt) zwischen den einzelnen Druckmessungen und einer Druck/Durchflußkenncharakteristik (k) des Füllventils (25) ergibt, und daß die Steuereinrichtung (19) beim Überschreiten einer Grenzfüllmenge (M (max) ) das Ansteuersignal (Z) an das Dosierventil (25) stoppt.Control signal (Z) controls, characterized in that the pressure (Pl) of the liquid is measured continuously at certain time intervals (Δt) during the filling process by the filling valve (25), that the control device (19) is the actually filled quantity (M ( )) calculated from a summation of partial volumes (ΔM), which results in consideration of the respectively measured pressure (Pl) of the liquid, the time intervals (Δt) between the individual pressure measurements and a pressure / flow characteristic (k) of the filling valve (25), and that the control device (19) stops the control signal (Z) to the metering valve (25) when a limit fill quantity (M (max)) is exceeded.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Zeitabstände (Δt) zwischen den einzelnen Messungen des Drucks (Pl) der Flüssigkeit konstant sind.2. The method according to claim 1, characterized in that the time intervals (Δt) between the individual measurements of the pressure (Pl) of the liquid are constant.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Zeitabstände (Δt) zwischen 150 μsec und 250 μsec, bevorzugt 200 μsec betragen. 3. The method according to claim 2, characterized in that the time intervals (Δt) are between 150 μsec and 250 μsec, preferably 200 μsec.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß während der gesamten Betriebsdauer einer Füllmaschine der Druck (Pl) der Flüssigkeit gemessen wird.4. The method according to any one of claims 1 to 3, characterized in that the pressure (Pl) of the liquid is measured during the entire operating time of a filling machine.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Ansteuersignal (Z) zum Betätigen des Füllventils (25) bei einer Grenzfüllmenge (M (max) ) gestoppt wird, die kleiner als die Sollfüllmenge (M) ist.5. The method according to any one of claims 1 to 4, characterized in that the control signal (Z) for actuating the filling valve (25) is stopped at a limit filling quantity (M (max)) which is smaller than the target filling quantity (M).
6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Ansteuersignal (Z) zum Betätigen des Füllventils (25) bei einer Grenzfüllmenge (M (max) ) gestoppt wird, die der Sollfüllmenge (M) entspricht.6. The method according to any one of claims 1 to 4, characterized in that the control signal (Z) for actuating the filling valve (25) is stopped at a limit filling quantity (M (max)) which corresponds to the target filling quantity (M).
7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß für den Offnungs- und Schließvorgang des Füllventils (25) vorgegebene Volumina (ΔM fest) angenommen werden, so daß während des Öffnens und Schließens des Füllventils keine Teilvolumina (ΔM) berechnet werden.7. The method according to any one of claims 1 to 6, characterized in that predetermined volumes (ΔM fixed) are assumed for the opening and closing process of the filling valve (25), so that no partial volumes (ΔM) are calculated during the opening and closing of the filling valve become.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Teilvolumina (ΔM) unter Berücksichtigung einer in der Flüssigkeit mittels eines Temperatursensors (31) gemessenen Temperatur (T) berechnet werden. 8. The method according to any one of claims 1 to 7, characterized in that the partial volumes (ΔM) are calculated taking into account a temperature (T) measured in the liquid by means of a temperature sensor (31).
EP96916004A 1995-06-16 1996-06-13 Method of filling containers with liquid under pressure Revoked EP0776314B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP7150670A JP2633820B2 (en) 1995-06-16 1995-06-16 Liquid pressure filling method
JP150670/95 1995-06-16
JP15067095 1995-06-16
PCT/DE1996/001037 WO1997000224A1 (en) 1995-06-16 1996-06-13 Method of filling containers with liquid under pressure

Publications (2)

Publication Number Publication Date
EP0776314A1 true EP0776314A1 (en) 1997-06-04
EP0776314B1 EP0776314B1 (en) 2000-05-03

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EP96916004A Revoked EP0776314B1 (en) 1995-06-16 1996-06-13 Method of filling containers with liquid under pressure

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US (1) US5823234A (en)
EP (1) EP0776314B1 (en)
JP (1) JP2633820B2 (en)
DE (1) DE59605120D1 (en)
ES (1) ES2147378T3 (en)
TR (1) TR199700101T1 (en)
WO (1) WO1997000224A1 (en)

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Publication number Publication date
TR199700101T1 (en) 1997-04-22
US5823234A (en) 1998-10-20
JPH092583A (en) 1997-01-07
WO1997000224A1 (en) 1997-01-03
DE59605120D1 (en) 2000-06-08
ES2147378T3 (en) 2000-09-01
EP0776314B1 (en) 2000-05-03
JP2633820B2 (en) 1997-07-23

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