EP3512640A1 - Device and method for dynamic metering of sealing compounds - Google Patents

Device and method for dynamic metering of sealing compounds

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Publication number
EP3512640A1
EP3512640A1 EP17762112.5A EP17762112A EP3512640A1 EP 3512640 A1 EP3512640 A1 EP 3512640A1 EP 17762112 A EP17762112 A EP 17762112A EP 3512640 A1 EP3512640 A1 EP 3512640A1
Authority
EP
European Patent Office
Prior art keywords
sealant
drive
containers
components
component
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
EP17762112.5A
Other languages
German (de)
French (fr)
Other versions
EP3512640B1 (en
Inventor
Heinz Burock
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.)
Chemetall GmbH
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Chemetall GmbH
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Filing date
Publication date
Application filed by Chemetall GmbH filed Critical Chemetall GmbH
Publication of EP3512640A1 publication Critical patent/EP3512640A1/en
Application granted granted Critical
Publication of EP3512640B1 publication Critical patent/EP3512640B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1036—Means for supplying a selected one of a plurality of liquids or other fluent materials, or several in selected proportions, to the applying apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71775—Feed mechanisms characterised by the means for feeding the components to the mixer using helical screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/83—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
    • B01F35/831—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices using one or more pump or other dispensing mechanisms for feeding the flows in predetermined proportion, e.g. one of the pumps being driven by one of the flows
    • B01F35/8311—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices using one or more pump or other dispensing mechanisms for feeding the flows in predetermined proportion, e.g. one of the pumps being driven by one of the flows with means for controlling the motor driving the pumps or the other dispensing mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/883—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using flow rate controls for feeding the substances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1039—Recovery of excess liquid or other fluent material; Controlling means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1047—Apparatus or installations for supplying liquid or other fluent material comprising a buffer container or an accumulator between the supply source and the applicator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet

Definitions

  • the present invention relates to a device for dynamic metering of sealant volumes and a corresponding method.
  • Sealants such as those used in aircraft and spacecraft are usually produced by mixing two components - base and hardener - in a mixing device and then locally, i. E. cured on the component to be coated. The latter can be done thermally and / or by actinic radiation.
  • Fig. 1 An apparatus for this purpose is shown in Fig. 1:
  • the components A and B are initially in separate storage containers.
  • a suitable drive preferably a servo drive, is controlled so that the two components (A and B) are conveyed at a defined speed into a static mixing tube and mixed with one another.
  • the sealing compound thus obtained, not yet fully cured, then leaves the device in the form of a bead.
  • the metering rate ie the volume of sealant applied per unit of time, must be dynamic, i. depending on the position just to be sealed.
  • the base material component - for example, such a polysulfide-based - is compressible, while the hardener component has no compressibility, which with decreasing dosing to a more and more delayed compared to the hardener component release of Base component leads from its reservoir.
  • the device according to the invention for the dynamic metering of sealing compounds has two containers for sealing compound components, a first drive, which is connected to two devices, one of which can convey one of the sealing mass components from its container (conveying devices), a drive control, a mixing unit for mixing the from the containers funded sealant components with an opening for applying the sealant to a component and in addition a reservoir with a compensating volume and a second drive, which is connected to a piston which extends into the compensating volume of the expansion tank, on.
  • the expansion tank is connected to the mixing unit. Through this connection, the expansion tank is filled and emptied.
  • the first and second drives may be dynamically controlled together by the drive controller.
  • a first such device according to the invention is shown in Fig. 2 and in Fig. 3, a second in Fig. 4, but without these figures would be understood to be limiting.
  • a “sealant” is always intended to mean the mixture of two sealant components.
  • the “first drive” can also consist of two drive units to be controlled separately of which the first is connected to the first and the second to the second of the two conveyors (see Fig. 4). According to a preferred embodiment, however, the first drive consists of a single drive unit, which is connected to the two conveyors.
  • the "two containers for sealing compound components” can be storage containers, ie containers which can each be filled with a specific amount of sealing compound component and then sealed (see Fig. 2 and Fig. 3).
  • the "two containers for sealing compound components" can be open containers, ie containers which can each be continuously filled with a sealing compound component (see Fig. 4). Fig. 4).
  • the “mixing unit” may be a static mixer, a dynamic mixer or a combination of both
  • the first and / or second drive is a servo drive, more preferably the first and second drives are each a servo drive.
  • the two conveyors are pistons, one of which in each case one of the containers, which in this case is a reservoir, extends and can push out the corresponding sealing compound component.
  • the two conveyors are pumps which can draw the sealing mass components from their containers by generating a vacuum.
  • screw eccentric pumps and scoop pumps are suitable for this purpose.
  • said containers are open containers which can each be continuously filled with a sealant component (see Fig. 4).
  • the mixing unit is preferably a static mixer, in particular a static mixing tube.
  • the expansion tank is preferably a plastic cartridge or an easy-to-clean component, particularly preferably a plastic cartridge, in particular a polyethylene (PE).
  • the device is a 2K mixing and metering system as described for example by the company Hilger u. Kern (Mannheim, Germany) is produced. These systems make it possible to convey, mix and dose sealing compound consisting of 2 components from storage containers (see Fig. 2 and Fig. 3).
  • the sealant may also be one which essentially cures only after irradiation with actinic radiation, in particular with UV radiation.
  • a sealant has the advantage that its hardening can be initiated in a controlled manner with a trigger (so-called SCOD: sealant curing on demand).
  • the device according to the invention can comprise an integrated source of actinic radiation, in particular for UV radiation.
  • the containers of the device according to the invention are each filled with a sealing compound component (components A and B or base material and hardener).
  • the sealant components are then mixed in a mixing unit and the resulting sealant is applied to a component by the sealing mass components are conveyed out of the containers by means of the first drive.
  • a metering rate of, for example, 1 volume unit sealant / time unit is realized by the conveying speed of the sealant components from the containers to 3 Volume units sealing compound / unit time is reduced and the expansion tank is filled at a rate of 2 volume units sealant / time unit.
  • Fig. 2 shows the device according to the invention at a dosing speed above the critical value.
  • the metering rate is lower than the critical value, which is indicated by a reduction in the thickness of the sealing mass bead.
  • the compensating volume of the expansion tank is filled in this case with sealant.
  • the delivery of the sealing compound components from the containers is preferably stopped and the sealing compound is conveyed from the compensation container by means of the second drive until the sealing compound in the compensation container has been used up.
  • This helps keep the expansion tank empty enough to allow refilling of the surge tank with sealant at a later time.
  • an increase in the dosing speed beyond the maximum value is possible, which would be possible with the device without the surge tank.
  • the present invention relates to a component which has been sealed by means of the method according to the invention, preferably one with a complicated geometry as used in aircraft and spacecraft.

Abstract

The present invention relates to a device for dynamic metering of sealing compound volumes and to a corresponding method. The device according to the invention has two containers for sealing compound components, a first drive which is connected to two mechanisms, of which in each case one can convey one of the sealing compound components out of its container, a drive controller, a mixing unit for mixing the sealing compound components conveyed out of the containers, with an opening for the application of the sealing compound onto a component, and additionally a compensating container with a compensating volume, and a second drive which is connected to a plunger which reaches into the compensating volume of the compensating container. The compensating container is connected here to the mixing unit. The first and the second drive can be jointly dynamically controlled by the drive controller.

Description

Vorrichtung und Verfahren zur dynamischen Dosierung von Dichtmassen  Device and method for dynamic metering of sealants
Die vorliegende Erfindung betrifft eine Vorrichtung zur dynamischen Dosierung von Dichtmassevolumina sowie ein entsprechendes Verfahren. The present invention relates to a device for dynamic metering of sealant volumes and a corresponding method.
Dichtmassen wie sie beispielsweise bei Flug- und Raumfahrzeugen zum Einsatz kommen werden in der Regel durch Mischen zweier Komponenten - Grundmasse und Härter - in einer Mischvorrichtung erzeugt und anschließend vor Ort, d.h. auf dem zu beschichtenden Bauteil ausgehärtet. Letzteres kann thermisch und/oder durch aktinische Strahlung geschehen. Sealants such as those used in aircraft and spacecraft are usually produced by mixing two components - base and hardener - in a mixing device and then locally, i. E. cured on the component to be coated. The latter can be done thermally and / or by actinic radiation.
Eine Vorrichtung hierzu ist in Abb. 1 gezeigt: Die Komponenten A und B befinden sich dabei zunächst in separaten Vorratsbehältern. Ein geeigneter Antrieb, vorzugsweise einen Servoantrieb, wird so angesteuert, dass die beiden Komponenten (A und B) mit definierter Geschwindigkeit in ein statisches Mischrohr gefördert und miteinander vermischt werden. Die so erhaltene, noch nicht vollständig ausgehärtete Dichtmasse verlässt die Vorrichtung dann in Form einer Raupe. Bei der Abdichtung von Bauteilen mit komplizierter Geometrie muss die Dosiergeschwindigkeit, also das Dichtmassevolumen, welches pro Zeiteinheit aufgetragen wird, dynamisch, d.h. je nach gerade abzudichtender Stelle, angepasst werden. Man spricht auch von einer dynamischen Dosierung. An apparatus for this purpose is shown in Fig. 1: The components A and B are initially in separate storage containers. A suitable drive, preferably a servo drive, is controlled so that the two components (A and B) are conveyed at a defined speed into a static mixing tube and mixed with one another. The sealing compound thus obtained, not yet fully cured, then leaves the device in the form of a bead. When sealing components with complicated geometry, the metering rate, ie the volume of sealant applied per unit of time, must be dynamic, i. depending on the position just to be sealed. One speaks also of a dynamic dosage.
Bei letzterer stellt sich allerdings das Problem, dass die Dosiergeschwindigkeit bei Verwendung von Statikmischern nicht beliebig erniedrigt werden kann, ohne dabei das Mischungsverhältnis und die Mischgüte negativ zu beeinflussen. With the latter, however, the problem arises that the metering rate can not be arbitrarily reduced when using static mixers, without negatively influencing the mixing ratio and the mixing quality.
Dies ist vor allem darauf zurückzuführen, dass die Grundmassen-Komponente - beispielsweise eine solche auf Polysulfid-Basis - komprimierbar ist, während die Härter- Komponente keine Komprimierbarkeit aufweist, was mit abnehmender Dosiergeschwindigkeit zu einer im Vergleich zur Härter-Komponente immer weiter verzögerten Freisetzung der Grundmassen-Komponente aus ihrem Vorratsbehälter führt. This is mainly due to the fact that the base material component - for example, such a polysulfide-based - is compressible, while the hardener component has no compressibility, which with decreasing dosing to a more and more delayed compared to the hardener component release of Base component leads from its reservoir.
Insbesondere bei geringsten Dosiergeschwindigkeiten wie sie für Punktdosierungen benötigt werden treten daher Probleme hinsichtlich eines veränderten Mischungsverhältnis sowie einer verminderten Mischgüte auf. Wird die Fahrgeschwindigkeit einer Traverse mit der oben beschriebenen Vorrichtung erhöht, um einen geringeren Austrag pro Wegstrecke - also eine scheinbar niedrigere Dosiergeschwindigkeit - zu erreichen, geht dies bei komplizierten Geometrien jedoch zu Lasten der Dosiergenauigkeit. Daher war es die Aufgabe der vorliegenden Erfindung, eine Vorrichtung zur dynamischen Dosierung von Dichtmassen sowie ein entsprechendes Verfahren bereitzustellen, bei der bzw. bei dem unabhängig von der Dosiergeschwindigkeit - also auch bei niedrigen Dosiergeschwindigkeiten - eine hinreichende Mischgüte sowie Dosiergenauigkeit erreicht wird. Diese Aufgabe wurde gelöst durch eine Vorrichtung nach Anspruch 1 sowie ein Verfahren nach Anspruch 10. Bevorzugte Ausführungsformen werden jeweils in den abhängigen Ansprüchen beschrieben. In particular, at the lowest dispensing speeds as required for point dosing problems therefore occur in terms of a changed mixing ratio and a reduced mixing quality. If the travel speed of a crossbeam with the device described above is increased in order to achieve a lower discharge per path - ie, a seemingly lower dosing speed - this is at the expense of the dosing accuracy in complicated geometries. It was therefore the object of the present invention to provide a device for the dynamic metering of sealants and a corresponding method in which, regardless of the metering rate - ie even at low metering speeds - a sufficient mixing quality and metering accuracy is achieved. This object has been achieved by a device according to claim 1 and a method according to claim 10. Preferred embodiments are each described in the dependent claims.
Die erfindungsgemäße Vorrichtung zur dynamischen Dosierung von Dichtmassen weist zwei Behälter für Dichtmassenkomponenten, einen ersten Antrieb, der mit zwei Einrichtungen verbunden ist, von denen jeweils eine eine der Dichtmassenkomponenten aus ihrem Behälter fördern kann (Fördereinrichtungen), eine Antriebssteuerung, eine Mischeinheit für das Mischen der aus den Behältern geförderten Dichtmassenkomponenten mit einer Öffnung für das Auftragen der Dichtmasse auf ein Bauteil sowie zusätzlich einen Ausgleichsbehälter mit einem Ausgleichsvolumen und einen zweiten Antrieb, der mit einem Kolben verbunden ist, der in das Ausgleichsvolumen des Ausgleichsbehälter reicht, auf. The device according to the invention for the dynamic metering of sealing compounds has two containers for sealing compound components, a first drive, which is connected to two devices, one of which can convey one of the sealing mass components from its container (conveying devices), a drive control, a mixing unit for mixing the from the containers funded sealant components with an opening for applying the sealant to a component and in addition a reservoir with a compensating volume and a second drive, which is connected to a piston which extends into the compensating volume of the expansion tank, on.
Dabei ist der Ausgleichsbehälter mit der Mischeinheit verbunden. Durch diese Verbindung wird der Ausgleichsbehälter gefüllt und entleert. Der erste und der zweite Antrieb können gemeinsam durch die Antriebssteuerung dynamisch gesteuert werden. Eine erste solche, erfindungsgemäße Vorrichtung ist in Abb. 2 sowie in Abb. 3, eine zweite in Abb. 4 gezeigt, ohne dass diese Abbildungen allerdings einschränkend zu verstehen wären. In this case, the expansion tank is connected to the mixing unit. Through this connection, the expansion tank is filled and emptied. The first and second drives may be dynamically controlled together by the drive controller. A first such device according to the invention is shown in Fig. 2 and in Fig. 3, a second in Fig. 4, but without these figures would be understood to be limiting.
Unter einer „Dichtmasse" soll vorliegend stets die Mischung zweier Dichtmassenkomponenten gemeint sein. Der „erste Antrieb" kann auch aus zwei separat zu steuernden Antriebseinheiten bestehen, von denen die erste mit der ersten und die zweite mit der zweiten der beiden Fördereinrichtungen verbunden ist (vgl. Abb. 4). Gemäß einer bevorzugten Ausführungsform besteht der erste Antrieb jedoch aus einer einzigen Antriebseinheit, die mit den beiden Fördereinrichtungen verbunden ist. Einerseits kann es sich bei den „zwei Behältern für Dichtmassenkomponenten" um Vorratsbehälter handeln, d.h. um Behälter, die jeweils mit einer bestimmten Menge an Dichtmassenkomponente befüllt und dann verschlossen werden können (vgl. Abb. 2 und Abb. 3). In the present case, a "sealant" is always intended to mean the mixture of two sealant components. The "first drive" can also consist of two drive units to be controlled separately of which the first is connected to the first and the second to the second of the two conveyors (see Fig. 4). According to a preferred embodiment, however, the first drive consists of a single drive unit, which is connected to the two conveyors. On the one hand, the "two containers for sealing compound components" can be storage containers, ie containers which can each be filled with a specific amount of sealing compound component and then sealed (see Fig. 2 and Fig. 3).
Andererseits kann es sich bei den„zwei Behältern für Dichtmassenkomponenten" um offene Behälter handeln, d.h. um Behälter, die jeweils kontinuierlich mit einer Dichtmassenkomponente befüllt werden können (vgl. Abb. 4). Auf diese Weise kann ein ununterbrochener Dichtmassestrom erreicht werden (vgl. Abb. 4). On the other hand, the "two containers for sealing compound components" can be open containers, ie containers which can each be continuously filled with a sealing compound component (see Fig. 4). Fig. 4).
Bei der„Mischeinheit" kann es sich um einen Statikmischer, einen Dynamikmischer oder eine Kombination von beiden handeln. Vorzugsweise handelt es sich bei dem ersten und/oder zweiten Antrieb um einen Servoantrieb, weiter bevorzugt ist der erste und der zweite Antrieb jeweils ein Servoantrieb. The "mixing unit" may be a static mixer, a dynamic mixer or a combination of both Preferably, the first and / or second drive is a servo drive, more preferably the first and second drives are each a servo drive.
Gemäß einer ersten bevorzugten Ausführungsform handelt es sich bei den beiden Fördereinrichtungen um Kolben, von denen je einer in einen der Behälter, bei denen es sich in diesem Fall um Vorratsbehälter handelt, reicht und die entsprechende Dichtmassenkomponente herausschieben kann. According to a first preferred embodiment, the two conveyors are pistons, one of which in each case one of the containers, which in this case is a reservoir, extends and can push out the corresponding sealing compound component.
Gemäß einer zweiten bevorzugten Ausführungsform handelt es sich bei den beiden Fördereinrichtungen um Pumpen, welche durch Erzeugen eines Vakuums die Dichtmassenkomponenten aus ihren Behältern ziehen können. Insbesondere sind hierfür Schneckenexzenterpumpen sowie Schöpfkolbenpumpen geeignet. According to a second preferred embodiment, the two conveyors are pumps which can draw the sealing mass components from their containers by generating a vacuum. In particular, screw eccentric pumps and scoop pumps are suitable for this purpose.
Vor allem im Falle von Schneckenexzenterpumpen handelt es sich bei besagten Behältern um offenen Behälter, die jeweils kontinuierlich mit einer Dichtmassenkomponente befüllt werden können (vgl. Abb. 4). Especially in the case of screw eccentric pumps, said containers are open containers which can each be continuously filled with a sealant component (see Fig. 4).
Bevorzugt handelt es sich bei der Mischeinheit um einen Statikmischer, insbesondere um ein statisches Mischrohr. Bei dem Ausgleichsbehälter handelt es sich bevorzugt um eine Kunststoffkartusche oder ein leicht zu reinigendes Bauteil, besonders bevorzugt um eine Kunststoffkartusche, insbesondere um eine solche aus Polyethylen (PE). The mixing unit is preferably a static mixer, in particular a static mixing tube. The expansion tank is preferably a plastic cartridge or an easy-to-clean component, particularly preferably a plastic cartridge, in particular a polyethylene (PE).
Gemäß einer ersten besonders bevorzugten Ausführungsform ist die Vorrichtung eine 2K Misch- und Dosieranlage wie sie beispielsweise von der Firma Hilger u. Kern (Mannheim, Deutschland) hergestellt wird. Diese Anlagen ermöglichen es, Dichtmasse bestehend aus 2 Komponenten aus Vorratsbehältern zu fördern, zu mischen und zu dosieren (vgl. Abb. 2 und Abb. 3). According to a first particularly preferred embodiment, the device is a 2K mixing and metering system as described for example by the company Hilger u. Kern (Mannheim, Germany) is produced. These systems make it possible to convey, mix and dose sealing compound consisting of 2 components from storage containers (see Fig. 2 and Fig. 3).
Bei der Dichtmasse kann es sich auch um eine solche handeln, welche im Wesentlichen erst nach Bestrahlung mit aktinischer Strahlung, insbesondere mit UV Strahlung aushärtet. Eine solche Dichtmasse hat den Vorteil, dass ihre Aushärtung kontrolliert mit einem Trigger initiiert werden kann (sog. SCOD: sealant curing on demand). Die erfindungsgemäße Vorrichtung kann hierzu eine integrierte Quelle für aktinische Strahlung, insbesondere für UV-Strahlung umfassen. Bei dem erfindungsgemäßen Verfahren zur dynamischen Dosierung von Dichtmassen werden die Behälter der erfindungsgemäßen Vorrichtung mit jeweils einer Dichtmassenkomponente befüllt (Komponenten A und B bzw. Grundmasse und Härter). Die Dichtmassenkomponenten werden dann in einer Mischeinheit gemischt und die resultierende Dichtmasse wird auf ein Bauteil aufgebracht, indem die Dichtmassenkomponenten mittels des ersten Antriebs aus den Behältern gefördert werden. The sealant may also be one which essentially cures only after irradiation with actinic radiation, in particular with UV radiation. Such a sealant has the advantage that its hardening can be initiated in a controlled manner with a trigger (so-called SCOD: sealant curing on demand). For this purpose, the device according to the invention can comprise an integrated source of actinic radiation, in particular for UV radiation. In the method according to the invention for the dynamic metering of sealing compounds, the containers of the device according to the invention are each filled with a sealing compound component (components A and B or base material and hardener). The sealant components are then mixed in a mixing unit and the resulting sealant is applied to a component by the sealing mass components are conveyed out of the containers by means of the first drive.
Dabei wird eine Dosiergeschwindigkeit unterhalb eines kritischen, in der Antriebssteuerung voreingestellten Werts, dadurch realisiert, dass die Fördergeschwindigkeit der Dichtmassenkomponenten aus den Behältern auf den kritischen Wert der Dosiergeschwindigkeit erniedrigt wird und der Ausgleichsbehälter mittels des zweiten Antriebs so mit Dichtmasse befüllt wird, dass die Geschwindigkeit, mit der der Ausgleichbehälter befüllt wird, der Differenz des kritischen und des realisierten Wertes der Dosiergeschwindigkeit entspricht. In this case, a metering speed below a critical, preset in the drive control value, realized in that the conveying speed of the sealant components from the containers is lowered to the critical value of the metering and the reservoir is filled by means of the second drive so with sealant that the speed, with which the expansion tank is filled, the difference of the critical and the realized value of the dosing speed corresponds.
Beträgt der kritische Wert der Dosiergeschwindigkeit beispielsweise 3 Volumeneinheiten Dichtmasse/Zeiteinheit, so wird eine Dosiergeschwindigkeit von beispielsweise 1 Volumeneinheit Dichtmasse/Zeiteinheit dadurch realisiert, dass die Fördergeschwindigkeit der Dichtmassenkomponenten aus den Behältern auf 3 Volumeneinheiten Dichtmasse/Zeiteinheit erniedrigt und der Ausgleichsbehälter mit einer Geschwindigkeit von 2 Volumeneinheiten Dichtmasse/Zeiteinheit befüllt wird. If the critical value of the metering rate is, for example, 3 volume units of sealant / time unit, then a metering rate of, for example, 1 volume unit sealant / time unit is realized by the conveying speed of the sealant components from the containers to 3 Volume units sealing compound / unit time is reduced and the expansion tank is filled at a rate of 2 volume units sealant / time unit.
Abb. 2 zeigt die erfindungsgemäße Vorrichtung bei einer Dosiergeschwindigkeit oberhalb des kritischen Werts. In Abb. 3 ist die Dosiergeschwindigkeit hingegen niedriger als der kritische Wert, was durch eine Verringerung der Dicke der Dichtmassenraupe angedeutet ist. Das Ausgleichsvolumen des Ausgleichsbehälters wird in diesem Fall mit Dichtmasse befüllt. Fig. 2 shows the device according to the invention at a dosing speed above the critical value. In Fig. 3, however, the metering rate is lower than the critical value, which is indicated by a reduction in the thickness of the sealing mass bead. The compensating volume of the expansion tank is filled in this case with sealant.
Im Falle des Wiederansteigens der Dosiergeschwindigkeit auf mindestens den kritischen Wert wird die Förderung der Dichtmassenkomponenten aus den Behältern vorzugsweise solange gestoppt und die Dichtmasse mittels des zweiten Antriebs aus dem Ausgleichsbehälter gefördert, bis die Dichtmasse im Ausgleichsbehälter aufgebraucht ist. Dies trägt dazu bei, den Ausgleichsbehälter leer genug zu halten, um zu einem späteren Zeitpunkt ein erneutes Befüllen des Ausgleichsbehälters mit Dichtmasse zu ermöglichen. Alternativ kann dann aber auch weiterhin die Förderung der Dichtmassenkomponenten mittels des ersten Antriebs aus den Behältern erfolgen und gleichzeitig die Dichtmasse mittels des zweiten Antriebs aus dem Ausgleichsbehälter gefördert werden, bis die Dichtmasse im Ausgleichsbehälter aufgebraucht ist. Hierdurch ist eine Erhöhung der Dosiergeschwindigkeit über den Höchstwert hinaus möglich, der mit der Vorrichtung ohne den Ausgleichsbehälter möglich wäre. If the metering rate rises again to at least the critical value, the delivery of the sealing compound components from the containers is preferably stopped and the sealing compound is conveyed from the compensation container by means of the second drive until the sealing compound in the compensation container has been used up. This helps keep the expansion tank empty enough to allow refilling of the surge tank with sealant at a later time. Alternatively, however, continue to promote the sealing mass components by means of the first drive from the containers and at the same time the sealant be promoted by means of the second drive from the surge tank until the sealant is used up in the expansion tank. As a result, an increase in the dosing speed beyond the maximum value is possible, which would be possible with the device without the surge tank.
Zudem betrifft die vorliegende Erfindung ein Bauteil, welches mittels des erfindungsgemäßen Verfahrens abgedichtet wurde, vorzugsweise ein solches mit komplizierter Geometrie wie es bei Flug- und Raumfahrzeugen zum Einsatz kommt. In addition, the present invention relates to a component which has been sealed by means of the method according to the invention, preferably one with a complicated geometry as used in aircraft and spacecraft.

Claims

Ansprüche claims
1 . Vorrichtung zur dynamischen Dosierung von Dichtmassen aufweisend 1 . Device for the dynamic metering of sealing compounds
zwei Behälter für Dichtmassenkomponenten,  two containers for sealing compound components,
einen ersten Antrieb, der mit zwei Einrichtungen verbunden ist, von denen jeweils eine eine der Dichtmassenkomponenten aus ihrem Behälter fördern kann, eine Antriebssteuerung,  a first drive, which is connected to two devices, each of which can promote one of the sealing mass components from its container, a drive control,
eine Mischeinheit für das Mischen der aus den Behältern geförderten Dichtmassenkomponenten mit einer Öffnung für das Auftragen der Dichtmasse auf ein Bauteil,  a mixing unit for mixing the sealing compound components conveyed from the containers with an opening for applying the sealing compound to a component,
dadurch gekennzeichnet, dass die Vorrichtung zusätzlich aufweist  characterized in that the device additionally comprises
einen Ausgleichsbehälter mit einem Ausgleichsvolumen und  a surge tank with a compensation volume and
einen zweiten Antrieb, der mit einem Kolben verbunden ist, der in das a second drive, which is connected to a piston which in the
Ausgleichsvolumen des Ausgleichsbehälters reicht, Compensation volume of the expansion tank is sufficient
wobei der Ausgleichsbehälter mit der Mischeinheit verbunden ist und wobei der erste und der zweite Antrieb gemeinsam durch die Antriebssteuerung dynamisch gesteuert werden können.  wherein the surge tank is connected to the mixing unit and wherein the first and the second drive can be controlled together by the drive control dynamically.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der erste und/oder der zweite Antrieb jeweils ein Servoantrieb ist. 2. Apparatus according to claim 1, characterized in that the first and / or the second drive is in each case a servo drive.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass es sich bei den beiden Fördereinrichtungen um Kolben handelt, von denen je einer in einen der Behälter für Dichtmassenkomponenten reicht, und dass es sich bei letzteren um Vorratsbehälter handelt. 3. Apparatus according to claim 1 or 2, characterized in that it is in the two conveyors are pistons, each of which extends into one of the container for sealing mass components, and that it is in the latter to reservoir.
4. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass es sich bei den beiden Fördereinrichtungen um Pumpen handelt, insbesondere um Schneckenexzenterpumpen oder Schöpfkolbenpumpen. 4. Apparatus according to claim 1 or 2, characterized in that it is at the two conveyors are pumps, in particular screw eccentric or Schöpfkolbenpumpen.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass es sich bei den beiden Fördereinrichtungen um Schneckenexzenterpumpen und bei den Behältern für Dichtmassekomponenten um offenen Behälter handelt, die jeweils kontinuierlich mit einer Dichtmassenkomponente befüllt werden können. 5. Apparatus according to claim 4, characterized in that it is at the two conveyors to Schneckenexzenterpumpen and the containers for sealant components to open container, which can each be continuously filled with a sealant component.
6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Mischeinheit ein Statikmischer ist. 6. Device according to one of the preceding claims, characterized in that the mixing unit is a static mixer.
7. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Ausgleichsbehälter eine Kunststoffkartusche oder ein leicht zu reinigendes Bauteil ist. 7. Device according to one of the preceding claims, characterized in that the expansion tank is a plastic cartridge or an easy-to-clean component.
8. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Vorrichtung eine 2K Misch- und Dosieranlage ist. 8. Device according to one of the preceding claims, characterized in that the device is a 2K mixing and dosing.
9. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie eine integrierte Quelle für aktinische Strahlung, umfasst. 9. Device according to one of the preceding claims, characterized in that it comprises an integrated source of actinic radiation.
10. Verfahren zur dynamischen Dosierung von Dichtmassen, dadurch gekennzeichnet, dass die Behälter der Vorrichtung nach einem der vorhergehenden Ansprüche mit jeweils einer Dichtmassenkomponente befüllt werden, dass die Dichtmassenkomponenten in einer Mischeinheit gemischt werden und dass die resultierende Dichtmasse auf ein Bauteil aufgebracht wird, indem die Dichtmassenkomponenten mittels des ersten Antrieb aus den Behältern gefördert werden, wobei 10. A method for the dynamic metering of sealing compounds, characterized in that the containers of the device are filled according to one of the preceding claims, each with a sealant component, that the sealant components are mixed in a mixing unit and that the resulting sealant is applied to a component by the Sealant components are conveyed by means of the first drive from the containers, wherein
eine Dosiergeschwindigkeit unterhalb eines kritischen, in der Antriebssteuerung voreingestellten Werts, dadurch realisiert wird, dass die Fördergeschwindigkeit der Dichtmassenkomponenten aus den Behältern auf den kritischen Wert der Dosiergeschwindigkeit erniedrigt wird und  a dosing speed below a critical, preset in the drive control value, is realized in that the conveying speed of the sealing mass components from the containers is lowered to the critical value of the dosing speed, and
der Ausgleichsbehälter mittels des zweiten Antriebs so mit Dichtmasse befüllt wird, dass die Geschwindigkeit, mit der der Ausgleichbehälter befüllt wird, der Differenz des kritischen und des realisierten Wertes der Dosiergeschwindigkeit entspricht.  the expansion tank is filled with sealing compound by means of the second drive in such a way that the speed with which the expansion tank is filled corresponds to the difference between the critical and the realized value of the metering rate.
1 1 . Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass im Falle des Wiederansteigens der Dosiergeschwindigkeit auf mindestens den kritischen Wert die Förderung der Dichtmassenkomponenten aus den Behältern solange gestoppt wird und die Dichtmasse mittels des zweiten Antriebs aus dem Ausgleichsbehälter gefördert wird, bis die Dichtmasse im Ausgleichsbehälter aufgebraucht ist. 1 1. A method according to claim 10, characterized in that in the case of re-increasing the metering speed to at least the critical value, the promotion of the sealant components from the containers is stopped and the sealant is conveyed by means of the second drive from the surge tank until the sealant is used up in the expansion tank ,
12. Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass im Falle des Wiederansteigens der Dosiergeschwindigkeit auf mindestens den kritischen Wert die Förderung der Dichtmassenkomponenten mittels des ersten Antriebs aus den Behältern und der Dichtmasse mittels des zweiten Antriebs aus dem Ausgleichsbehälter gleichzeitig erfolgt, bis die Dichtmasse im Ausgleichsbehälter aufgebraucht ist. 12. The method according to claim 10, characterized in that in the case of re-rising the metering speed to at least the critical value, the promotion of the sealant components by means of the first drive from the Containers and the sealant by means of the second drive from the surge tank is carried out simultaneously until the sealant is used up in the expansion tank.
13. Verfahren nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, dass es sich bei der Dichtmasse um eine solche handelt, welche im Wesentlichen erst nach Bestrahlung mit aktinischer Strahlung aushärtet. 13. The method according to any one of claims 10 to 12, characterized in that it is the sealant is one which cures substantially only after irradiation with actinic radiation.
14. Bauteil, dadurch gekennzeichnet, dass es mittels eines Verfahrens nach einem der Ansprüche 10 bis 13 abgedichtet wurde. 14. component, characterized in that it has been sealed by means of a method according to any one of claims 10 to 13.
EP17762112.5A 2016-09-13 2017-09-05 Device and method for dynamic metering of sealing compounds Active EP3512640B1 (en)

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CA3036589A1 (en) 2018-03-22

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