EP0949008B1 - Device for coating sheets and strips - Google Patents

Device for coating sheets and strips Download PDF

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Publication number
EP0949008B1
EP0949008B1 EP99250079A EP99250079A EP0949008B1 EP 0949008 B1 EP0949008 B1 EP 0949008B1 EP 99250079 A EP99250079 A EP 99250079A EP 99250079 A EP99250079 A EP 99250079A EP 0949008 B1 EP0949008 B1 EP 0949008B1
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EP
European Patent Office
Prior art keywords
pump
feed pump
main feed
medium
flow
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EP99250079A
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German (de)
French (fr)
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EP0949008A3 (en
EP0949008A2 (en
Inventor
Peter Dr. Maresch
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SMR de Haan GmbH
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SMR de Haan GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
    • B67D7/06—Details or accessories
    • B67D7/58—Arrangements of pumps
    • B67D7/70—Arrangements of pumps of two or more pumps in series or parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B05B9/0406—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material with several pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0209—Rotational speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/09—Flow through the pump

Abstract

The coating device has a supply tank for the coating medium coupled to a feed pump (16), which is used in conjunction with a feedback pump (17) delivering part of the flow delivery from the feed pump back to the supply tank, or the suction side of the feed pump, for regulation of the delivery rate of the coating medium to a coating spray.

Description

Die Erfindung betrifft eine Vorrichtung zum dosierten Fördern eines Mediums, wobei die Vorrichtung einen Vorratstank für das Medium hat, und daß mindestens eine Hauptförderpumpe das Medium vom Vorratstank weg fördert. Eine solche Vorrichtung entsprechend dem Oberbegriffs der Ansprüche 1 und 2 wird in US 5094 597 gezeigt.The invention relates to a device for metered conveying a medium, the device a storage tank for the medium has, and that at least one main pump the Promote medium away from storage tank. Such a device according to the preamble of claims 1 and 2 is in US 5094 597.

Beim Beschichten, insbesondere von Blechen und/oder Bändern, welche sich unter der Vorrichtung mit konstanter Geschwindigkeit bewegen, ist es notwendig, das Medium, insbesondere Öl, möglichst konstant zu einem Mittel zum Verteilen und/oder Versprühen des Mediums zu fördern, um eine gleichmäßige Beschichtung bzw. Ölung der Bleche und/oder Bänder zu gewährleisten. Heutige Vorrichtungen müssen sowohl die Mikroölung als auch herkömmliche Ölschichtdicken erzeugen, wodurch besondere Anforderungen an das Pumpensystem für die Dosierung bzw. für die gleichmäßige Förderung des Mediums gestellt sind. When coating, in particular sheets and / or strips, which is below the device with constant Moving speed, it is necessary the medium, especially oil, as constant as possible to a means to Distributing and / or spraying the medium to promote a uniform coating or oiling of the sheets and / or Ensure tapes. Today's devices must both the micro-oil as well as conventional oil layer thicknesses generate, which makes special demands on the pump system for the dosage or for the uniform promotion of Medium are placed.

Aufgrund der Blechbreiten-, Geschwindigkeits- und Schichtdickenbereiche müssen derartige Vorrichtungen Volumenströme im Bereich von ca. 0,001 ltr./min bis 2 ltr./min (Inspektionsanlage) realisieren. Dies entspricht einem Regelbereich von in etwa 1:2000.
Bei den herkömmlich bekannten Vorrichtungen, wie sie in den Figuren 1 bis 4 dargestellt sind, wird aus einem Vorratstank 1 über eine Pumpe 2 und einen Filter das beheizte Öl im Kreislauf über geheizte Leitungen 3 in dem Bereich der Einölmaschine und wieder zurück in den Tank geleitet. Um das Blech von oben und unten gleichmäßig mit Öl besprühen bzw. beschichten zu können, sind für die Ober- und Unterseite des Bleches jeweils zwei Dosierpumpen vorgesehen, die aus dem Kreislauf die erforderliche Ölmenge entnehmen. Zur genauen Dosierung wird die abgenommene Ölmenge durch ein Durchflußmeßgerät überwacht. Jedes Pumpenpaar 4a, 4b sowie 5a, 5b ist so dimensioniert, daß der geförderte Volumenstrombereich abgedeckt werden kann. Dabei deckt die kleinere Pumpe den Bereich der kleinen Volumenströme und die größere Pumpe den Volumenbereich der großen Volumenströme ab. Die Bereiche beider Pumpen überdecken sich, wie in den Figuren 3 und 4 dargestellt, je nach den gegebenen Anforderungen unterschiedlich groß. Im allgemeinen laufen beide Pumpen 4a, 4b nicht gleichzeitig. Lediglich beim Übergang, beim Beschleunigen oder Bremsen der zu beölenden Bleche kommt es teilweise zum gleichzeitigen Fördern der Pumpen. Für diesen kurzen Moment sind Ungenauigkeiten in der Dosierung unvermeidbar. Due to the sheet width, speed and layer thickness ranges such devices must realize flow rates in the range of about 0.001 ltr./min to 2 ltr./min (inspection system). This corresponds to a control range of approximately 1: 2000.
In the conventionally known devices, as shown in Figures 1 to 4, the heated oil is circulated from a storage tank 1 via a pump 2 and a filter via heated lines 3 in the area of the oiling machine and back into the tank , In order to be able to spray or coat the sheet evenly with oil from above and below, two metering pumps are provided for the top and bottom of the sheet, which remove the required amount of oil from the circuit. For accurate metering, the amount of oil removed is monitored by a flowmeter. Each pump pair 4a, 4b and 5a, 5b is dimensioned so that the funded volume flow range can be covered. The smaller pump covers the range of small volume flows and the larger pump covers the volume range of the large volume flows. The areas of both pumps overlap, as shown in Figures 3 and 4, depending on the given requirements of different sizes. In general, both pumps 4a, 4b do not run simultaneously. Only during the transition, during acceleration or braking of the sheets to be oiled, it comes in part to the simultaneous pumping of the pumps. For this short moment inaccuracies in the dosage are unavoidable.

Da im Übergangsbereich beide Pumpen unterschiedliche Drehzahlen haben, sind separate Antriebe für die beiden Pumpen notwendig.Since in the transition area both pumps different Speeds have separate drives for the two Pumps necessary.

Ein Konzept, das einen Übergang in der Überlappungszone vermeidet und mit einem gemeinsamen Antrieb für beide Pumpen arbeitet, geht von der Tatsache aus, daß ein Teil der Variationsbreite durch eine Voreinstellung abgedeckt wird und sich während des Betriebes nicht ändert, was bedeutet, daß die Blechbreite und die erforderliche Schichtdicke konstant bleiben, und nur die Geschwindigkeitsänderungen regelbar sind. In diesem Fall ist ein entsprechend großer Überlappungsbereich vorzusehen, damit das Verhältnis zwischen dem maximalen Volumenstrom der kleinen Pumpe und dem minimalen Volumenstrom der großen Pumpe der Geschwindigkeitsänderung entspricht. Die Anforderungen an den Regelbereich der Pumpen sind bei diesem Konzept höher (1:200) als bei einem Konzept mit einem kleineren Überlappungsbereich (1:40). Beiden Konzepten ist gemeinsam, daß der gesamte Regelbereich der Pumpen ausgenutzt wird. Dies bedeutet, daß die Pumpen auch im unteren Drehzahlbereich gefahren werden, wodurch Pulsationen des Volumenstromes auftreten.A concept involving a transition in the overlapping zone avoids and with a common drive for both pumps works, is based on the fact that part of the Variation width is covered by a presetting and does not change during operation, which means that the sheet width and the required layer thickness constant remain, and only the speed changes controllable are. In this case, a correspondingly large Provide overlap area, so that the ratio between the maximum flow rate of the small pump and the minimum flow rate of the large pump Speed change corresponds. The requirements for the Control range of the pumps are higher with this concept (1: 200) as a concept with a smaller overlap area (1:40). Both concepts have in common that the whole Control range of the pump is utilized. This means that the pumps are also driven in the lower speed range, whereby pulsations of the volume flow occur.

Aufgabe der vorliegenden Erfindung ist es daher, eine Vorrichtung bereitzustellen, bei der eine Pulsation der Volumenströme in einem möglichst breiten Regelbereich vermieden werden. Object of the present invention is therefore, a To provide a device in which a pulsation of Volume flows in the widest possible control range be avoided.

Diese Aufgabe wird erfinderisch, gemäß den Ansprüchen, dadurch gelöst, daß ein definierter Teil des Förderstromes nach verlassen der Hauptförderpumpe zurück zur Ansaugseite der Hauptförderpumpe oder dem Vorratstank geleitet wird, und zur Einstellung des abgezweigten Förderstroms mindestens eine Rückflußpumpe dient.This object is inventively, according to the claims, achieved in that a defined part of the flow after leaving the Main feed pump back to the suction side of the main feed pump or the storage tank is passed, and to adjust the branched off flow at least one reflux pump serves.

Die Aufgabe wird für Ölbeschichtungsanlagen, gemäß den Ansprüchen, speziell dadurch gelöst, daß ein definierter Teil des Förderstroms vor dem Erreichen des Mittels abgezweigt und zurück zur Ansaugseite der Hauptförderpumpe oder dem Vorratstank geleitet wird, und zur Einstellung des abgezweigten Förderstroms mindestens eine Rückflußpumpe parallel zur Hauptförderpumpe angeordnet ist, die das Medium von der Auslaßseite der Hauptförderpumpe hin zur Ansaugseite der Hauptförderpumpe oder dem Vorratstank fördert. Durch das Parallelschalten der Hauptförderpumpe und der Rückflußpumpe, wobei diese gegeneinander fördern, ist es möglich, beide Pumpen mit der gleichen Drehzahl fördern zu lassen, wodurch kein Medium hin zum verteilenden Mittel gefördert wird. Bei geringer Abweichung der Förderströme der beiden Pumpen, wobei stets die Rückflußpumpe einen kleineren Volumenstrom als die Hauptförderpumpe fördert, können beliebig kleine Volumenströme hin zum Verteilungsmittel, welches unter anderem ein elektrostatischer Sprühbalken sein kann, gefördert werden. Durch Abschalten der Rückflußmenge wird kein Medium mehr zurück zu der Pumpenansaugseite der Hauptförderpumpe gefördert, wodurch der die Hauptförderpumpe passierende Volumenstrom dem Volumenstrom durch das Verteilungsmittel entspricht. Durch eine derartige Beschaltung muß notwendigerweise nur noch eine Pumpe drehzahlregelbarn ausgelegt werden, wodurch Kosten für eine aufwendige Steuerung eines Motors einer Pumpe entfallen. Besonders vorteilhaft bei dieser ersten Ausführungsform der Erfindung ist, daß beide Pumpen nicht von der Drehzahl Null bis zur Maximaldrehzahl gefahren werden müssen, da durch die Subtraktion der beiden geförderten Volumenströme der Pumpen eine minimale beliebige Drehzahl wählbar ist, bei der gerade kein Medium hin zum Verteilungsmittel gefördert wird. Hierdurch werden vorteilhaft die beim Stand der Technik auftretenden Pulsationen der Volumenströme bedingt durch zu geringe Drehzahlen der Pumpen vermieden.The object is for oil coating equipment, according to the claims, especially thereby solved that a defined part of the flow before the Reaching the means branched off and back to the suction side the main pump or storage tank is routed, and at least one to set the branched flow Return pump is arranged parallel to the main pump, the medium from the outlet side of the main pump to the suction side of the main pump or the storage tank promotes. By the parallel connection of the main pump and the reflux pump, these promote each other, it is possible to pump both pumps at the same speed which leaves no medium to the distributing means is encouraged. With small deviation of the flow rates of the two pumps, with always the reflux pump a smaller Volume flow than the main pump promotes any small volume flows towards the distribution medium, which may be, inter alia, an electrostatic spray bar can be encouraged. By switching off the reflux rate no medium is returned to the pump suction side Main pump pumped, making the main pump passing volume flow through the volume flow through the Distribution means corresponds. By such Circuitry must necessarily only one pump be designed drehregelregelbarn, thereby reducing costs for a Complex control of a motor of a pump omitted. Particularly advantageous in this first embodiment of the Invention is that both pumps are not zero in speed must be driven to the maximum speed, since by the Subtraction of the two pumped volume flows of the pumps a minimum arbitrary speed is selectable, at the straight no medium is conveyed to the distribution means. This will be advantageous in the prior art occurring pulsations of the volume flows due to low speeds of the pump avoided.

Die oben gestellte Aufgabe wird ebenfalls gemäß den Ansprüchen dadurch gelöst, daß eine Reihenschaltung aus mindestens zwei Ventilen, von denen mindestens ein Ventil ein Proportionalventil ist, parallel zur Hauptförderpumpe angeordnet ist und zwischen den beiden Ventilen das Medium abgegriffen und zum Mittel geleitet wird. Durch die Beschaltung der Hauptförderpumpe mit einer Reihenschaltung aus mindestens zwei Ventilen, wobei zwischen den beiden Ventilen das Medium abgegriffen und zum Mittel geleitet wird, ist es möglich, ohne ein zusätzliche Pumpe einen beliebigen Volumenstrom einzustellen. Hierdurch werden vorteilhaft Installations- und Wartungskosten gespart und zudem die Funktionssicherheit der Vorrichtung erhöht. The above object is also according to the claims solved in that a series circuit of at least two Valves, of which at least one valve Proportional valve is, parallel to the main pump is arranged and between the two valves the medium tapped and directed to the middle. By the Wiring of the main pump with a series connection from at least two valves, being between the two Valves the medium is tapped and directed to the agent, It is possible to use any one without an additional pump Adjust flow rate. This will be advantageous Saved installation and maintenance costs and also the Increased functional reliability of the device.

Durch das Antreiben der Hauptförderpumpe und der Rückflußpumpe kann der effektiv geförderte Volumenstrom mittels nur eines Antriebes bzw. mittels nur einer Stellgröße eingestellt werden. Hierbei können die Hauptförder- und die Rückflußpumpe für unterschiedlich große Volumenströme bei gleicher Drehzahl dimensioniert sein. Es ist aber auch möglich, zwei identische Pumpen, die mit unterschiedlichen Drehzahlen betrieben werden, einzusetzen, wobei die Hauptförderpumpe mit einer höheren Drehzahl läuft als die Rückflußpumpe. Die verschiedenen Drehzahlen lassen sich z.B. mittels Differential- oder Verteilergetriebe realisieren.By driving the main pump and the Return flow pump can effectively conveyed volume flow by means of only one drive or by means of only one manipulated variable be set. Here, the main conveyor and the Return flow pump for different volume flows be dimensioned the same speed. It is also possible, two identical pumps, with different ones Rotational speeds are operated to use, wherein the Main feed pump runs at a higher speed than the Reflux pump. The various speeds can be e.g. realize by means of differential or transfer case.

Nachfolgend wird die Erfindung anhand von Ausführungsbeispielen näher erläutert.The invention is based on Embodiments explained in more detail.

Es zeigen:

Figur 1:
ein Blockschaltbild einer Vorrichtung gemäß dem Stand der Technik;
Figur 2:
eine schematische Darstellung eines elektrostatischen Sprühbalkens zur Verteilung von Öl auf Blechen;
Figur 3 und 4:
Steuerungsbereiche von Förderpumpen gemäß dem Stand der Technik;
Figur 5:
ein Blockschaltbild mit zur Hauptförderpumpe parallel geschalteter Rückflußpumpe und
Figur 6:
ein Drehzahl-Volumenstrom-Diagramm für eine Vorrichtung gemäß der Figur 5;
Show it:
FIG. 1:
a block diagram of a device according to the prior art;
FIG. 2:
a schematic representation of an electrostatic spray bar for distribution of oil on metal sheets;
FIGS. 3 and 4:
Control ranges of feed pumps according to the prior art;
FIG. 5:
a block diagram with parallel to the main pump return pump and
FIG. 6:
a speed-volume flow diagram for a device according to Figure 5;

Die Figur 1 zeigt eine Vorrichtung gemäß dem Stand der Technik mit einem Vorratstank 1, aus dem über eine Pumpe 2 ein Medium, insbesondere Öl, gefördert wird, welches durch geheizte Leitungen 3 wieder zurück in den Tank 1 gelangt. Zwischen den geheizten Leitungen 3 wird mittels Pumpen 4a, 4b, 5a, 5b das Öl abgepumpt und von dort über jede Pumpe nachgeschalteter Rückschlagventile 6 zu einem in Figur 2 dargestellten elektrostatischen Sprühbalken 10 gefördert.FIG. 1 shows a device according to the prior art Technique with a storage tank 1, from which a pump 2 a medium, in particular oil, is conveyed through heated lines 3 back into the tank 1 passes. Between the heated lines 3 by means of pumps 4a, 4b, 5a, 5b, the oil pumped out and from there via each pump downstream check valves 6 to one in Figure 2 promoted shown electrostatic spray bar 10.

In Figur 2 ist lediglich ein elektrostatischer Sprühbalken 10 für die Beschichtung der Oberseite des Bleches 13 dargestellt. Die Pumpen 4a, 4b sowie die Pumpen 5a, 5b für die Beschichtung des Bleches 13 mit einem Beschichtungsmedium 14 werden von nicht dargestellten Pumpensteuerungen gesteuert, wobei die tatsächliche Fördermenge jedes Pumpenpaares mittels eines Durchflußmessers 7, welcher in der Leitung 8, 9 zu dem jeweiligen elektrostatischen Sprühbalken 10 angeordnet ist, gemessen und den Pumpensteuerungen zugeführt wird. Das Fördermedium gelangt in den elektrostatischen Sprühbalken und wird dort gleichmäßig über die Breite des Bleches bzw. Blechbandes 13 verteilt.In FIG. 2, only one electrostatic spray bar 10 is shown for the coating of the top of the sheet 13 shown. The pumps 4a, 4b and the pumps 5a, 5b for the coating of the sheet 13 with a coating medium 14 are not shown pump controls controlled, with the actual flow rate each Pump pair by means of a flow meter 7, which in the Line 8, 9 to the respective electrostatic spray bar 10 is located, measured and the pump controls is supplied. The fluid enters the electrostatic spray bar and is there evenly over the width of the sheet metal strip 13 distributed.

Die Figuren 3 und 4 zeigen die Überlappungsbereiche der Förderpumpenpaare 4a, 4b sowie 5a, 5b bei einer Vorrichtung gemäß dem Stand der Technik bedingt durch die Parallelschaltung und die Förderung in dieselbe Richtung beider Pumpen ist jeweils der kleinste Förderstrom durch die minimale Drehzahl der kleinsten der beiden Pumpen begrenzt.Figures 3 and 4 show the overlapping areas of Feed pump pairs 4a, 4b and 5a, 5b in a device according to the prior art due to the Parallel connection and promotion in the same direction both pumps is the smallest flow through the limited minimum speed of the smallest of the two pumps.

Die Figur 5 zeigt die erfindungsgemäße Vorrichtung, bei der parallel zur Hauptförderpumpe 16 eine Rückflußpumpe 17 angeordnet ist, wobei beiden Pumpen 16, 17 jeweils ein Rückschlagventil 6 nachgeschaltet ist, welches zur Erzeugung eines definierten Leckstromes in der jeweiligen Pumpe dient. Die Rückflußpumpe 17 sowie deren Rückschlagventil 6 ist über ein Mehrwegventil 18 mit der Hauptförderpumpe 16 in Verbindung. Mittels des Mehrwegventil 18 kann einmal die Rückflußpumpe 17 in entgegengesetzter Richtung zur Hauptförderpumpe fördern. Es ist jedoch auch möglich, daß beide Pumpen 16, 17 parallel fördern, so daß sich ihre Volumenströme addieren. Es ist ferner möglich, mittels des Mehrwegventils 18, die Rückflußpumpe 17 von der Hauptförderpumpe 16 mit beiden Zuführleitungen zu trennen.FIG. 5 shows the device according to the invention, in which parallel to the main pump 16, a reflux pump 17th is arranged, with two pumps 16, 17 each one Check valve 6 is connected downstream, which is for generating a defined leakage current in the respective pump is used. The reflux pump 17 and the check valve 6 is over a multi-way valve 18 with the main feed pump 16 in Connection. By means of the multi-way valve 18 can once the Return flow pump 17 in the opposite direction to Promote main feed pump. However, it is also possible that promote both pumps 16, 17 in parallel, so that their Add volume flows. It is also possible, by means of Multiway valve 18, the reflux pump 17 of the Main pump 16 to separate with two supply lines.

Die drehzahlgeregelte Hauptförderpumpe 16 wird in Abhängigkeit des Wertes des Durchflußmessers 17a geregelt.The speed-controlled main pump 16 is in Dependence of the value of the flow meter 17a regulated.

Parallel zu der Förderpumpe können auch zwei Proportionalventile angeordnet werden, wobei das Rückschlagventil 6 direkt hinter der Förderpumpe angeordnet ist. Zwischen den beiden Proportionalventilen wird dann der Volumenstrom durch eine Leitung abgegriffen und zum Sprühbalken geleitet. Zur Steuerung der der beiden Proportionalventile dient ein ebenfalls nicht dargestellter Drehzahlmesser, welcher in der Leitung angeordnet ist. Je nach Einstellung der Proportionalventile kann ein bestimmter Druck und somit ein bestimmter Förderstrom in der Leitung eingeregelt werden, wobei die Drehzahl der Förderpumpe konstant gehalten wird. Es ist jedoch auch möglich, die Pumpe drehzahlgeregelt auszuführen, wobei ein noch weiterer Regelungsbereich bei gleicher Dimensionierung der Proportionalventile ermöglicht wird. Die Leitung 15 greift, wie in der Figur 1 dargestellt, das Fördermedium zwischen den beiden geheizten Leitungen 3 ab. Two pumps can be used in parallel with the feed pump Proportional valves are arranged, the Check valve 6 arranged directly behind the feed pump is. Between the two proportional valves is then the Volume flow tapped by a line and the Guided spray bar. To control the two Proportional valves are also not shown Tachometer, which is arranged in the line. ever After setting the proportional valves, a specific Pressure and thus a certain flow in the line be adjusted, the speed of the feed pump is kept constant. However, it is also possible to use the pump speed controlled perform, with yet another Control range with the same dimensioning of Proportional valves is possible. The line 15 attacks, As shown in Figure 1, the fluid between the both heated lines 3 from.

Zusätzlich zu der Reihenschaltung der Proportionalventile kann ein weiteres Proportionalventil parallel zu der Förderpumpe geschaltet werden, durch das das von der Förderpumpe geförderte Medium von der Pumpenauslaßseite zur Pumpenansaugseite gelangen kann. Das weitere Proportionalventil dient bei einer mit konstanter Drehzahl gefahrenen Förderpumpe zur Druckminderung am Einlaß des Proportionalventils, wodurch der Regelbereich der Reihenschaltung der Proportionalventile weiter verändert werden kann. Für einen Betrieb der Vorrichtung mit den Proportionalventilen ist jedoch das weitere Proportionalventil nicht zwingend erforderlich.In addition to the series connection of the proportional valves can another proportional valve in parallel with the Feed pump to be switched by the from the Feed pump pumped medium from the pump outlet side to Pump suction can go. The further Proportional valve is used at a constant speed driven pump for pressure reduction at the inlet of Proportional valve, whereby the control range of Series connection of the proportional valves further changed can be. For operation of the device with the Proportional valves, however, is the other Proportional valve not mandatory.

Die Figur 6 zeigt ein Diagramm, bei dem der Volumenstrom über der Drehzahl der Pumpe A aufgetragen ist. Deutlich ist zu erkennen, daß bei der Drehzahl nmin sich ein resulierender Volumenstrom A - B = 0 ergibt. Durch die Regelung der Drehzahl der Pumpe A kann der Volumenstrom zwischen 0 und vmax mittels der Pumpe A eingestellt werden. Die Pumpe B wird mit konstanter Drehzahl betrieben, wodurch sie einen stets konstanten Volumenstrom fördert.FIG. 6 shows a diagram in which the volume flow is plotted against the rotational speed of the pump A. It can be clearly seen that at the speed n min a resulting volumetric flow A - B = 0 results. By controlling the speed of the pump A, the volume flow between 0 and v max can be adjusted by means of the pump A. The pump B is operated at a constant speed, whereby it promotes a constant flow rate.

Im Fall, daß die Rückflußpumpe 17a der Fig. 5 drehzahlgeregelt ist und die Pumpe A mit einer konstanten Drehzahl einen Volumenstrom vmax fördert, ergibt sich durch die Subtraktion der beiden Volumenströme A -B ein resultierender Volumenstrom, der der bei der minimalen Drehzahl nmim der drehzahlgeregelten Pumpe B maximal ist und bei der maximalen Drehzahl nmax der Pumpe B gleich Null ist.In the event that the reflux pump 17a of FIG. 5 is speed-controlled and the pump A promotes a volume flow vmax with a constant speed, resulting by the subtraction of the two volume flows A -B a resulting volume flow, which at the minimum speed n mim of speed-controlled pump B is maximum and at the maximum speed n max of the pump B is equal to zero.

Claims (11)

  1. A Device for dosed delivery of a medium, where the device has a store tank for the medium, and at least one main feed pump conveys the medium away from the store tank,
    characterized in that a defined proportion of the delivered flow after having left the main feed pump is conveyed back to the suction side of the main feed pump or the store tank, and at least one back flow pump serves for adjusting the branched off delivered flow.
  2. A device for coating metal sheets and/or strips (13) with a medium (14), in particular oil, where the device has a store tank (1) for the medium (14) and a means (10) for diffusing and/or spraying the medium (14) on the metal sheets and/or strips, and that at least one main feed pump (16) according to demand conveys a determined quantity of the medium (14) from the store tank (1) to the means (10),
    characterized in that a defined proportion of the delivered flow is branched off before reaching the means (10) and conveyed back to the suction side of the main feed pump (16) or the store tank (1), and for adjusting the branched off delivered flow at least one back flow pump (17) is arranged parallel to the main feed pump (16) which conveys the medium (14) from the outlet side of the main feed pump (16) towards the suction side of the main feed pump (16) or the store tank (1).
  3. A device according to claims 1 or 2,
    characterized in that the main feed pump (16) which conveys the medium (14) in the direction of the means (10) is speed regulated, whereby the main feed pump (16) delivers a flow which at each time exceeds the delivered flow necessary for coating by the constant delivered flow of the back flow pump (17).
  4. A device according to claims 1 or 2,
    characterized in that the back flow pump (17) is speed regulated, whereby it delivers a flow which at each time is smaller than the delivered flow necessary for coating by the constant delivered flow of the main feed pump (16), which conveys the medium (14) in the direction of the means (10).
  5. A device according to any preceding claim,
    characterized in that each pump (16, 17) is topped by a check valve (6), a throttle and/or any other means to generate a pressure on the outlet sides of the pumps.
  6. A device according to any of claims 1 to 5,
    characterized in that by means of a valve control (18) it is possible to reverse the delivery direction of the back flow pump (17) in such a way, that the main feed pump (16) as well as the back flow pump (17) convey the medium (14) from the store tank (1) towards the means (10).
  7. A device according to any of claims 1 to 6,
    characterized in that the connecting pipes from the main feed pump (16) towards the back flow pump (17) are interruptible by means of valves (18).
  8. A device according to claims 1 or 2,
    characterized in that a range of at least two valves (22, 23), of which at least one is a proportional valve, is arranged parallel to the main feed pump (20), and the medium (14) is tapped between the two valves (22, 23) and conveyed to the means (10).
  9. A device according to claim 8,
    characterized in that the main feed pump (20) delivers at constant speed and the tapped volume flow rate is adjustable by means of valves (22,23).
  10. A device according to one of the claims 1 to 9,
    characterized in that the means (10) is an electrostatic spray arm.
  11. A device according to one of the claims 1 to 10,
    characterized in that the main feed pump and the back flow pump are driven by a jointly in particular adjustable drive and/or a differential or power take-off gear.
EP99250079A 1998-03-16 1999-03-16 Device for coating sheets and strips Expired - Lifetime EP0949008B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19811400 1998-03-16
DE19811400A DE19811400A1 (en) 1998-03-16 1998-03-16 Sheet or web coating device, e.g. for providing oil microfilm layer

Publications (3)

Publication Number Publication Date
EP0949008A2 EP0949008A2 (en) 1999-10-13
EP0949008A3 EP0949008A3 (en) 2004-06-23
EP0949008B1 true EP0949008B1 (en) 2005-10-26

Family

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Application Number Title Priority Date Filing Date
EP99250079A Expired - Lifetime EP0949008B1 (en) 1998-03-16 1999-03-16 Device for coating sheets and strips

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EP (1) EP0949008B1 (en)
AT (1) ATE307675T1 (en)
DE (2) DE19811400A1 (en)

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DE10104635A1 (en) * 2001-02-02 2002-10-02 Joma Hydromechanic Gmbh Method for maintaining a constant output value, e.g. pressure, feed volume or capacity for vehicle oil pump, using rotational velocity transducer to adjust rotational speed of pump
DE102009019564A1 (en) * 2009-05-02 2010-11-11 Voith Patent Gmbh Pumping method for providing predetermined total flow rate of hydraulic fluid by selectable total pressure, involves operating main supply pump by speed regulating electrical main drive
DE102011118836B4 (en) * 2011-11-18 2014-11-06 Thomas Magnete Gmbh Double pump unit with counter-flow directions and method of operation thereof
CN104369403A (en) * 2014-10-05 2015-02-25 赛轮集团股份有限公司 Gasoline brush-coating device of tyre building machine
US10578005B2 (en) * 2016-02-01 2020-03-03 Ghsp, Inc. Smart two-pump apparatus, control and method

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DE2618046A1 (en) * 1976-04-24 1977-11-10 Sven O I Jonsson Stored energy utilisation system - has hydraulic motor driven by lowering pressure coupled to dynamo recharging battery
DE3007116C2 (en) * 1980-02-26 1986-11-20 Walter Hofmann, Maschinenfabrik, 2084 Rellingen Arrangement for pulsation-free delivery of a liquid medium
FR2551365B1 (en) * 1983-08-01 1986-03-28 Lorraine Laminage DEVICE FOR OILING SHEETS IN CONTINUOUS TAPE
DE3330665A1 (en) * 1983-08-25 1985-03-14 Weitmann & Konrad GmbH & Co KG, 7022 Leinfelden-Echterdingen DEVICE FOR DUSTING MOVING OBJECTS, IN PARTICULAR AREA DOCUMENTS
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Also Published As

Publication number Publication date
ATE307675T1 (en) 2005-11-15
DE59912694D1 (en) 2005-12-01
EP0949008A3 (en) 2004-06-23
EP0949008A2 (en) 1999-10-13
DE19811400A1 (en) 1999-09-23

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