EP0223017B1 - Process for metering fluid metal, and pump therefor - Google Patents

Process for metering fluid metal, and pump therefor Download PDF

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Publication number
EP0223017B1
EP0223017B1 EP86113282A EP86113282A EP0223017B1 EP 0223017 B1 EP0223017 B1 EP 0223017B1 EP 86113282 A EP86113282 A EP 86113282A EP 86113282 A EP86113282 A EP 86113282A EP 0223017 B1 EP0223017 B1 EP 0223017B1
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EP
European Patent Office
Prior art keywords
feed
throughput
intervals
delivery
fluid metal
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EP86113282A
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German (de)
French (fr)
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EP0223017A1 (en
Inventor
Bruno Berg
Theodor Dipl.-Ing. Lauhoff
Klaus Dipl.-Ing. Thissen
Joachim Barzantny
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Interatom Internationale Atomreaktorbau GmbH
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Interatom Internationale Atomreaktorbau GmbH
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Priority to AT86113282T priority Critical patent/ATE54592T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D39/00—Equipment for supplying molten metal in rations

Definitions

  • the present invention relates to a method for dosing liquid metal using an electromagnetic pump.
  • EP-A 0 095 620 a method for regulating the delivery rate of an inductive liquid metal feed pump is already known, in which several different parameters are used to regulate the pump. From this document it is also known that the liquid metal level must always be held at a defined position in the conveyor pipe during the breaks in delivery in order to enable precise metering.
  • DE-B 1 286 701 describes the metering of liquid metal using an electromagnetic feed trough, the coil arrangement generating a magnetic traveling field consisting of two parts, of which a first part is continuously in operation and a second part is switched on to convey the liquid metal, is switched off during funding breaks.
  • a metering in the case of an electromagnetic conveyor trough is possible, since the electromagnetic conveyor trough, unlike the electromagnetic pump, has an inherent control mechanism for the delivery rate due to the fact that the magnetic traveling field causing the delivery is highly inhomogeneous in a direction perpendicular to the direction of delivery .
  • the object of the present invention is to create a simplified method for metering liquid metal with an electromagnetic pump, which requires little instrumentation and control technology.
  • a method according to claim 1 is proposed.
  • the invention is based on the knowledge that the service which is necessary in the delivery breaks to maintain a certain delivery head in a feed system already contains all the information about the delivery system required for the regulation. If the melt level in the melt container is low, for example, or if the melt temperature is high, increased output is required even during the delivery pauses to maintain the specified delivery head in the feed system. It is therefore not necessary to measure the corresponding parameters in the melt container.
  • the mean value of the output in the breaks between subsidies can easily be determined by separately measuring or calculating the integral part of the controllers, which then gives the average value of the output, plus the additional output must be added in the funding times.
  • the liquid metal flow in the feed system is throttled by means of a defined throttle point.
  • a defined throttle point In the case of a pure time control of the metering device, it is important that constant delivery quantities per unit of time are always achieved in the delivery times, whereby these should not change in the course of the operating time. The influence of other deposits in the feed system is greatly reduced by a defined throttle point, since the cross-section of the throttle point essentially determines the delivery rate per unit of time
  • the area of the feed system which is not filled with liquid metal is kept under protective gas in the feed breaks, namely by gushing feed at the end of the feed times and by low feed in the feed breaks.
  • This measure which is particularly important for easily oxidizable liquid metals, for example magnesium, additionally reduces the risk of oxidic deposits in the feed system.
  • each electromagnetic pump shows a functional dependence of the delivery pressure A P for a given square of the coil current 1 2 on the temperature of the melt. If the pump is designed so that eP / l 2 is as independent of the melt temperature as possible, which is possible through appropriate geometry and coil dimensioning, the control only needs to take into account the liquid metal level in the melt container, but not the melt temperature, which increases the accuracy.
  • the drawing shows a schematic representation of a metering system for liquid metal with its associated control devices.
  • the casting head 1 which can be filled with liquid metal by a liquid metal feed pump 2 via a feed pipe 3, is particularly emphasized in scale.
  • the liquid metal comes from a conventional melt container or the like, not shown here.
  • the casting head 1 has a prechamber 4, an overflow section 7 and an outlet chamber 8.
  • a fill level measuring arrangement 5 is arranged in the pre-chamber 4, preferably an inductive fill level meter which can be inserted from below into a corresponding pocket tube. By means of this fill level meter 5, the liquid metal level 6 in the antechamber 4 can be measured precisely and precisely adjusted to a specific target value in the delivery pauses.
  • the overflow section 7 or, as shown here, the outlet chamber 8 has a throttle point 9 which forms a defined delivery cross section for the liquid metal. Furthermore, the outlet chamber 8, preferably behind the throttle point 9, has a protective gas feed 10 through which protective gas can be supplied.
  • a slide valve 11 at the lower end 12 of the outlet chamber 8 enables the outlet chamber to be closed during breaks in delivery.
  • a controllable valve 13 enables protective gas to be supplied in gushes from a storage container 14.
  • Central control electronics 16 control the entire metering process. For this purpose, the electronics are first subjected to the level values measured in a level measuring electronics 15 in the prechamber 4. From this, the control electronics 16 determines the delivery rate of the delivery pump 2 during the delivery breaks, so that a precise fill level 6 can be maintained.
  • the control circuit 16 increases the delivery rate for a certain time by a certain amount, so that the desired amount of liquid metal is delivered.
  • the delivery rate is then reduced again to the initial value and the liquid metal level 6 of the prechamber is brought to the previous setpoint.
  • the valve 13 is opened at the end of the conveying process and a surge of protective gas is let into the outlet chamber 8. This prevents the entry of oxygen into the casting head 1.
  • By closing the slide valve 11, the oxygen-free atmosphere in the casting head 1 is maintained and dripping is prevented.
  • the proposed pouring head is particularly suitable for conveying liquid metal in connection with electromagnetic feed pumps, since these have good controllability and fast response times.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

1. A method for metering fluid metal wherein, through regulation of the throughput of an electromagnetic feed pump in the feed intervals by means of a liquid level sensor (5), a fixed delivery level (6) in a supply system (3, 4, 7, 8) is preserved and during the feed times the throughput is increased, characterised by the following features : a) the throughput required for preserving the delivery level (6) in the feed intervals is measured ; b) during the feed times the throughput is increased by a fixed amount above the throughput measured in the feed intervals.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Dosierung von Flüssigmetall unter Verwendung einer elektromagnetischen Pumpe. Aus der EP-A 0 095 620 ist bereits ein Verfahren zur Regelung der Förderleistung einer induktiven Flüssigmetallförderpumpe bekannt, bei welcher mehrere verschiedene Parameter zur Regelung der Pumpe benutzt werden. Aus dieser Schrift ist auch bekannt, daß während der Förderpausen der Flüssigmetallspiegel immer an einer definierten Stelle im Förderrohr gehalten werden muß, um eine präzise Dosierung zu ermöglichen.The present invention relates to a method for dosing liquid metal using an electromagnetic pump. From EP-A 0 095 620 a method for regulating the delivery rate of an inductive liquid metal feed pump is already known, in which several different parameters are used to regulate the pump. From this document it is also known that the liquid metal level must always be held at a defined position in the conveyor pipe during the breaks in delivery in order to enable precise metering.

Die bisherigen Verfahren zur Dosierung von Flüssigmetall gingen in ihrem Regelungs- bzw. Steuerkonzept davon aus, daß für eine präzise Dosierung mehrere Parameter, so beispielsweise die Höhe der Schmelze im Vorratsbehälter und deren Temperatur, bekannt sein mußten, damit die Leistung der Pumpe in den Förderzeiten entsprechend eingestellt werden konnte.The previous methods for dosing liquid metal assumed in their regulation or control concept that for precise dosing several parameters, such as the height of the melt in the reservoir and its temperature, had to be known so that the performance of the pump during the delivery times could be set accordingly.

In der DE-B 1 286 701 wird die Dosierung von Flüssigmetall unter Verwendung einer elektromagnetischen Förderrinne beschrieben, wobei die ein magnetisches Wanderfeld erzeugende Spulenanordnung aus zwei Teilen besteht, wovon ein erster Teil ständig in Betrieb ist und ein zweiter Teil zur Förderung des Flüssigmetalls zugeschaltet, in Förderpausen jedoch abgeschaltet ist. Eine derartige Dosierung im Fall einer elektromagnetischen Förderrinne ist möglich, da der elektromagnetischen Förderrinne im Gegensatz zur elektromagnetischen Pumpe beim Betrieb ein inhärenter Regelmechanismus für die Förderleistung eigen ist, darin begründet, daß das die Förderung bewirkende magnetische Wanderfeld in einer Richtung senkrecht zur Förderrichtung stark inhomogen ist. Die Regelung einer elektromagnetischen Förderrinne wird dadurch im Vergleich zur elektromagnetischen Pumpe, bei der aufgrund der weitgehenden Homogenität des fördernden Magnetfeldes kein systembedingter Regelungseffekt auftritt, wesentlich vereinfacht. Der Einsatz einer Förderrinne ist allerdings dadurch, daß sie im Gegensatz zur elektromagnetischen Pumpe nicht unter Druck fördern kann, substantiellen Einschränkungen unterworfen.DE-B 1 286 701 describes the metering of liquid metal using an electromagnetic feed trough, the coil arrangement generating a magnetic traveling field consisting of two parts, of which a first part is continuously in operation and a second part is switched on to convey the liquid metal, is switched off during funding breaks. Such a metering in the case of an electromagnetic conveyor trough is possible, since the electromagnetic conveyor trough, unlike the electromagnetic pump, has an inherent control mechanism for the delivery rate due to the fact that the magnetic traveling field causing the delivery is highly inhomogeneous in a direction perpendicular to the direction of delivery . The regulation of an electromagnetic feed trough is thereby considerably simplified in comparison to the electromagnetic pump, in which no system-related control effect occurs due to the largely homogenous nature of the conveying magnetic field. However, the use of a conveyor trough is subject to substantial restrictions because, unlike an electromagnetic pump, it cannot deliver under pressure.

Aufgabe der vorliegenden Erfindung ist die Schaffung eines vereinfachten Verfahrens zur Dosierung von Flüssigmetall mit einer elektromagnetischen Pumpe, welches mit einem geringen Aufwand an Instrumentierung und Regelungstechnik auskommt. Zur Lösung dieser Aufgabe wird ein Verfahren nach dem Anspruch 1 vorgeschlagen. Die Erfindung geht dabei von der Erkenntnis aus, daß die Leistung, welche in den Förderpausen zur Einhaltung einer bestimmten Förderhöhe in einem Zuführsystem nötig ist, schon alle für die Regelung benötigten Informationen über das Fördersystem enthält. Bei einem niedrigen Spiegel der Schmelze im Schmelzenbehälter beispielsweise oder bei hoher Schmelzentemperatur wird schon in den Förderpausen eine erhöhte, Leistung zur Einhaltung der bestimmten Förderhöhe im Zuführsystem benötigt. Es ist daher nicht nötig, die entsprechenden Parameter im Schmelzenbehälter zu messen. Vielmehr kann man während der Förderzeiten die Pumpleistung immer um einen bestimmten Betrag über die Pausenleistung erhöhen und erreicht dadurch eine konstante Fördermenge pro Zeiteinheit, so daß eine präzise Dosierung durcg reine Zeitsteuerung des Pumpvorganges möglich ist. Dies vereinfacht die Steuerung des Dosiervorganges. Außer einem Füllstandsfühler wird keine weitere Instrumentierung benötigt. Das bisher beschriebene Verfahren weist jedoch bei sehr hohen Anforderungen an die Genauigkeit eine Schwierigkeit auf. Die Flüssigmetallsäule im Zuführsystem ist eine schwingfähige Masse, deren Einregelung auf einen bestimmten Sollwert mit einem einfachen Proportionalregler nicht genügend genau ist. Es muß daher ein Regler mit Integralanteil, vorzugsweise ein PID-Regler oder ein ID-Regler verwendet werden. Geregelt wird die Leistung der Förderpumpe und gemessen wird der Füllstand, d.h. die Höhe der Flüssigmetallsäure im Zuführsystem. Bei dieser Art der Regelung stellt sich keine konstante Leistung zur Einhaltung einer bestimmten Flüssigmetallsäulenhöhe ein, sondern es finden während der Förderpause ständig kleine Regelschwankungen statt. Dennoch läßt sich der Mittelwert der Leistung in den Förderpausen, welcher für das erfindungsgemäße Verfahren von Bedeutung ist, leicht ermitteln, indem der Integralanteil der Reglers getrennt gemessen, bzw. berechnet wird, woraus sich dann der Mittelwert der Leistung ergibt, zu dem die zusätzliche Leistung in den Förderzeiten addiert werden muß.The object of the present invention is to create a simplified method for metering liquid metal with an electromagnetic pump, which requires little instrumentation and control technology. To achieve this object, a method according to claim 1 is proposed. The invention is based on the knowledge that the service which is necessary in the delivery breaks to maintain a certain delivery head in a feed system already contains all the information about the delivery system required for the regulation. If the melt level in the melt container is low, for example, or if the melt temperature is high, increased output is required even during the delivery pauses to maintain the specified delivery head in the feed system. It is therefore not necessary to measure the corresponding parameters in the melt container. Rather, you can always increase the pumping capacity during the delivery times by a certain amount over the break performance and thereby achieve a constant delivery rate per unit of time, so that a precise dosing by pure time control of the pumping process is possible. This simplifies the control of the dosing process. Apart from a level sensor, no further instrumentation is required. However, the method described so far has a problem with very high demands on the accuracy. The liquid metal column in the feed system is an oscillating mass, the adjustment of which to a certain setpoint is not sufficiently precise with a simple proportional controller. A controller with an integral component, preferably a PID controller or an ID controller, must therefore be used. The output of the feed pump is regulated and the level is measured, i.e. the level of liquid metal acid in the feed system. With this type of control, there is no constant output to maintain a certain liquid metal column height, but there are constantly small control fluctuations during the break in delivery. Nevertheless, the mean value of the output in the breaks between subsidies, which is important for the method according to the invention, can easily be determined by separately measuring or calculating the integral part of the controllers, which then gives the average value of the output, plus the additional output must be added in the funding times.

In weiterer Ausgestaltung der Erfindung wird im Anspruch 3 vorgeschlagen, daß der Flüssigmetallstrom im Zuführsystem, vorzugsweise in dessen End- bzw. Auslaßbereich mittels einer definierten Drosselstelle gedrosselt wird. Bei einer reinen Zeitsteuerung der Dosiervorrichtung ist es wichtig, daß in den Förderzeiten immer konstante Fördermengen pro Zeiteinheit erreicht werden, wobei sich diese im Laufe der Betriebszeit nicht verändern sollen. Durch eine definierte Drosselstelle werden Einflüsse von sonstigen Ablagerungen im Zuführsystem stark verringert, da im wesentlichen der Querschnitt der Drosselstelle die Fördermenge pro Zeiteinheit bestimmtIn a further embodiment of the invention it is proposed in claim 3 that the liquid metal flow in the feed system, preferably in its end or outlet area, is throttled by means of a defined throttle point. In the case of a pure time control of the metering device, it is important that constant delivery quantities per unit of time are always achieved in the delivery times, whereby these should not change in the course of the operating time. The influence of other deposits in the feed system is greatly reduced by a defined throttle point, since the cross-section of the throttle point essentially determines the delivery rate per unit of time

In weiterer Ausgestaltung der Erfindung wird im Anspruch 4 vorgeschlagen, daß in den Förderpausen der nicht mit Flüssigmetall gefüllte Bereich des Zuführsystems unter Schutzgas gehalten wird, und zwar durch schwallartige Zufuhr am Ende der Förderzeiten und durch geringe Zufuhr in den Förderpausen. Diese Maßnahme, welche insbesondere für leicht oxidierbare Flüssigmetalle, beispielsweise Magnesium, von Bedeutung ist, verringert zusätzlich das Risiko von oxidischen Ablagerungen im Zuführsystem.In a further embodiment of the invention it is proposed in claim 4 that the area of the feed system which is not filled with liquid metal is kept under protective gas in the feed breaks, namely by gushing feed at the end of the feed times and by low feed in the feed breaks. This measure, which is particularly important for easily oxidizable liquid metals, for example magnesium, additionally reduces the risk of oxidic deposits in the feed system.

Ergänzend dazu wird im Anspruch 5 noch vorgeschlagen, daß am Ende der Förderzeiten nach Beendigung des Flüssigmetallflusses das Ende des Zuführsystems mittels eines Schiebers oder dergleichen verschlossen wird. Dadurch wird das System weitgehend gegen Sauerstoffzufuhr abgedichtet, ohne daß der Verbrauch an Schutzgas besonders hoch wird.In addition, it is also proposed in claim 5 that at the end of the delivery times after the liquid metal flow has ended, the end of the feed system is closed by means of a slide or the like. As a result, the system is largely sealed against the supply of oxygen without the consumption of protective gas becoming particularly high.

Normalerweise zeigt jede elektromagnetische Pumpe eine funktionale Abhängigkeit der Förderdruckes AP bei gegebenem Quadrat des Spulenstromes 12 von der Temperatur der Schmelze. Wird die Pumpe so ausgelegt, daß eP/l2 möglichst unabhängig von der Schmelzentemperatur ist, was durch entsprechende Geometrie und Spulendimensionierung möglich ist, braucht die Regelung nur noch den Flüssigmetallspiegel im Schmelzenbehälter, nicht jedoch die Schmelzentemperatur zu berücksichtigen, wodurch die Genauigkeit erhöht wird.Normally, each electromagnetic pump shows a functional dependence of the delivery pressure A P for a given square of the coil current 1 2 on the temperature of the melt. If the pump is designed so that eP / l 2 is as independent of the melt temperature as possible, which is possible through appropriate geometry and coil dimensioning, the control only needs to take into account the liquid metal level in the melt container, but not the melt temperature, which increases the accuracy.

Die Zeichnung zeigt in schematischer Darstellung ein Dosiersystem für Flüssigmetall mit seinen zugehörigen Regeleinrichtungen. Besonders im Maßstab herausgestellt ist der Gießkopf 1, welcher von einer Flüssigmetallförderpumpe 2 über ein Zuführrohr 3 mit Flüssigmetall gefüllt werden kann. Das Flüssigmetall stammt aus einem hier nicht dargestellten üblichen Schmelzenbehälter oder dergleichen. Der Gießkopf 1 weist eine Vorkammer 4, einen Überlaufabschnitt 7 und eine Auslaßkammer 8 auf. In der Vorkammer 4 ist eine Füllstandsmeßanordnung 5 angeordnet, und zwar vorzugsweise ein induktiver Füllstandsmesser, welcher von unten in ein entsprechendes Sackrohr einführbar ist. Mittels dieses Füllstandsmessers 5 kann der Flüssigmetallspiegel 6 in der Vorkammer 4 genau gemessen und in den Förderpausen auf einen ganz bestimmten Sollwert präzise eingeregelt werden. Der Überlaufabschnitt 7 bzw., wie hier dargestellt die Auslaßkammer 8 weist eine Drosselstelle 9 auf, welche einen definierten Förderquerschnitt für das Flüssigmetall bildet. Ferner weist die Auslaßkammer 8, vorzugsweise hinter der Drosselstelle 9 eine Schutzgaseinspeisung 10 auf, durch welche Schutzgas zugeführt werden kann. Ein Verschlußschieber 11 am unteren Ende 12 der Auslaßkammer 8, ermöglicht ein Verschließen der Auslaßkammer in Förderpausen. Ein steuerbares Ventil 13 ermöglicht die schwallweise Zufuhr von Schutzgas aus einem Vorratsbehälter 14. Eine zentrale Steuerelektronik 16 steuert den gesamten Dosiervorgang. Dazu wird die Elektronik zunächst mit den in einer Füllstandsmeßelektronik 15 gemessenen Füllstandswerten in der Vorkammer 4 beaufschlagt. Daraus bestimmt die Steuerelektronik 16 die Förderleistung der Förderpumpe 2 in den Förderpausen, so daß ein präziser Füllstand 6 eingehalten werden kann. Während der Förderzeiten erhöht die Steuerschaltung 16 die Förderleistung für eine bestimmte Zeit um einen bestimmten Betrag, so daß die gewünschte Flüssigmetallmenge gefördert wird. Anschließend wird die Förderleistung wieder auf den Ausgangswert reduziert und der Flüssigmetallspiegel 6 der Vorkammer auf den vorherigen Sollwert gebracht. Gleichzeitig wird bei Beendigung des Fördervorganges das Ventil 13 geöffnet und ein Schwall Schutzgas in die Auslaßkammer 8 eingelassen. Dadurch wird der Zutritt von Sauerstoff in den Gießkopf 1 verhindert. Durch Schließen des Verschlußschiebers 11 wird die sauerstofffreie Atmosphäre im Gießkopf 1 erhalten und ein Nachtropfen verhindert. Der vorgeschlagene Gießkopf eignet sich in besonderer Weise zur Förderung von Flüssigmetall in Verbindung mit elektromagnetischen Förderpumpen, da diese eine gute Regelbarkeit und schnelle Ansprechzeiten besitzen.The drawing shows a schematic representation of a metering system for liquid metal with its associated control devices. The casting head 1, which can be filled with liquid metal by a liquid metal feed pump 2 via a feed pipe 3, is particularly emphasized in scale. The liquid metal comes from a conventional melt container or the like, not shown here. The casting head 1 has a prechamber 4, an overflow section 7 and an outlet chamber 8. A fill level measuring arrangement 5 is arranged in the pre-chamber 4, preferably an inductive fill level meter which can be inserted from below into a corresponding pocket tube. By means of this fill level meter 5, the liquid metal level 6 in the antechamber 4 can be measured precisely and precisely adjusted to a specific target value in the delivery pauses. The overflow section 7 or, as shown here, the outlet chamber 8 has a throttle point 9 which forms a defined delivery cross section for the liquid metal. Furthermore, the outlet chamber 8, preferably behind the throttle point 9, has a protective gas feed 10 through which protective gas can be supplied. A slide valve 11 at the lower end 12 of the outlet chamber 8 enables the outlet chamber to be closed during breaks in delivery. A controllable valve 13 enables protective gas to be supplied in gushes from a storage container 14. Central control electronics 16 control the entire metering process. For this purpose, the electronics are first subjected to the level values measured in a level measuring electronics 15 in the prechamber 4. From this, the control electronics 16 determines the delivery rate of the delivery pump 2 during the delivery breaks, so that a precise fill level 6 can be maintained. During the delivery times, the control circuit 16 increases the delivery rate for a certain time by a certain amount, so that the desired amount of liquid metal is delivered. The delivery rate is then reduced again to the initial value and the liquid metal level 6 of the prechamber is brought to the previous setpoint. At the same time, the valve 13 is opened at the end of the conveying process and a surge of protective gas is let into the outlet chamber 8. This prevents the entry of oxygen into the casting head 1. By closing the slide valve 11, the oxygen-free atmosphere in the casting head 1 is maintained and dripping is prevented. The proposed pouring head is particularly suitable for conveying liquid metal in connection with electromagnetic feed pumps, since these have good controllability and fast response times.

Claims (5)

1. A method for metering fluid metal wherein, through regulation of the throughput of an electromagnetic feed pump in the feed intervals by means of a liquid level sensor (5), a fixed delivery level (6) in a supply system (3, 4, 7, 8) is preserved and during the feed times the throughput is increased, characterised by the following features:
a) the throughput required for preserving the delivery level (6) in the feed intervals is measured;
b) during the feed times the throughput is increased by a fixed amount above the throughput measured in the feed intervals.
2. A method according to claim 1, characterised in that the regulation of the delivery level during the feed intervals occurs through a controller with an integral-action component, preferably a PID-controller or an ID-controller, wherein the integral-action component of the controller is measured separately or calculated, from which then the mean value of the throughput is determined in the feed intervals, to which mean value the additional throughput in the feed times is added.
3. A method according to claim 1, or 2, characterised in that the fluid metal flow in the supply system (3, 4, 7, 8), preferably in its end or outlet region (7, 8), is throttled by means of a defined restrictor (9).
4. A method according to claim 1, 2 or 3, characterised in that, in the feed intervals, the region (7, 8) of the supply system (3, 4, 7, 8) not filled with fluid metal is kept under protective gas and indeed a surging supply at the end of the feed times and a limited supply in the feed intervals.
5. A method according to claim 4, characterised in that at the end of the feed times, after termination of the fluid metal flow, the end (12) of the supply system (3, 4, 7, 8) is closed by means of a slide (11) or the like.
EP86113282A 1985-10-07 1986-09-26 Process for metering fluid metal, and pump therefor Expired - Lifetime EP0223017B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86113282T ATE54592T1 (en) 1985-10-07 1986-09-26 METHOD OF DOSING LIQUID METAL AND ASSOCIATED PUMP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3535796 1985-10-07
DE3535796 1985-10-07

Publications (2)

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EP0223017A1 EP0223017A1 (en) 1987-05-27
EP0223017B1 true EP0223017B1 (en) 1990-07-18

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EP86113282A Expired - Lifetime EP0223017B1 (en) 1985-10-07 1986-09-26 Process for metering fluid metal, and pump therefor

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AT (1) ATE54592T1 (en)
DE (1) DE3672757D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102909357A (en) * 2012-10-31 2013-02-06 重庆硕龙科技有限公司 Quantitative pouring method of light alloy melt

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK77694A (en) * 1994-06-29 1995-12-30 Dansk Ind Syndikat Method and device for casting against the gravity of molds, especially wet sand molds, in particular easily oxidizable metals or metal alloys of the finished molding process

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2540217C3 (en) * 1975-09-10 1979-12-06 Aeg-Elotherm Gmbh, 5630 Remscheid Process for putting electromagnetic conveying troughs into operation for the transport of liquid metals and conveying trough suitable for carrying out the process
EP0095620B1 (en) * 1982-05-27 1986-09-24 INTERATOM Gesellschaft mit beschränkter Haftung Method and device for regulating the delivery capacity of an inductive delivery pump for liquid metals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102909357A (en) * 2012-10-31 2013-02-06 重庆硕龙科技有限公司 Quantitative pouring method of light alloy melt

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EP0223017A1 (en) 1987-05-27
DE3672757D1 (en) 1990-08-23
ATE54592T1 (en) 1990-08-15

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