EP0747132A2 - Device for applying a pasty fluid - Google Patents

Device for applying a pasty fluid Download PDF

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Publication number
EP0747132A2
EP0747132A2 EP96105621A EP96105621A EP0747132A2 EP 0747132 A2 EP0747132 A2 EP 0747132A2 EP 96105621 A EP96105621 A EP 96105621A EP 96105621 A EP96105621 A EP 96105621A EP 0747132 A2 EP0747132 A2 EP 0747132A2
Authority
EP
European Patent Office
Prior art keywords
medium
storage space
pressure
needle
volume
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
EP96105621A
Other languages
German (de)
French (fr)
Other versions
EP0747132A3 (en
EP0747132B1 (en
Inventor
Harry Dipl.-Ing. Keller
Hans Liman
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.)
Ford Global Technologies LLC
Original Assignee
Ford France SA
Ford Motor Co Ltd
Ford Motor Co
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Filing date
Publication date
Application filed by Ford France SA, Ford Motor Co Ltd, Ford Motor Co filed Critical Ford France SA
Publication of EP0747132A2 publication Critical patent/EP0747132A2/en
Publication of EP0747132A3 publication Critical patent/EP0747132A3/en
Application granted granted Critical
Publication of EP0747132B1 publication Critical patent/EP0747132B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B05C11/1047—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
    • 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
    • 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 invention relates to a device for applying pasty media with a feed connection for the medium to be applied, which is supplied under pressure, and with a storage space from which the medium exits the device from an outlet nozzle.
  • the pasty media to be applied can be, for example, adhesives which are applied, for example, in the form of strip-shaped coatings in the production of motor vehicles and are used for fastening or attaching components, such as windshields.
  • the paste-like medium to be applied is supplied from a storage container, the pressure which brings about the transport being generated by a pump.
  • the pasty medium brought in by the pump is first fed to a storage space, from which the medium is conducted to the outlet nozzle at a largely constant pressure.
  • the storage space of the known device has a single opening, which is used in succession first as a feed connection for filling the storage space and then subsequently for the medium to exit through an outlet nozzle.
  • the pasty medium is supplied to the storage room in an amount that corresponds to the requirements of a specific order work cycle. Only after the storage room has been filled, the pasty medium can be applied by opening the outlet nozzle.
  • the known device thus operates discontinuously and is complicated in terms of control technology and is therefore complex and expensive.
  • the invention has for its object to improve a device of the type mentioned in that it works continuously and has a simple structure.
  • the storage space - seen in the material flow direction - is arranged between the feed connection and the outlet nozzle, and the storage space is associated with a volume change device designed in such a way that when the pressure in the medium brought up increases in volume and in the case of a pressure drop in the medium introduced is a volume reduction of the storage space in a pressure fluctuations in the medium introduced compensating manner.
  • the storage space is thus flowed through by the medium, the storage space thus always containing a defined amount of the pasty medium.
  • the device works continuously.
  • the volume of the storage space is increased in such a way that the pressure rise is compensated for, so that the medium emerges from the outlet nozzle with constant pressure regardless of the pressure rise on the feed side of the storage space.
  • the pressure of the supplied medium decreases, the volume of the storage space is reduced by the action of the volume changing device, so that the pressure drop in the pasty medium in the region of the outlet nozzle is also compensated.
  • the device according to the invention can be implemented in a simple manner, which leads to low production costs. Another advantage of the invention is that the pasty medium to be applied always flows through the storage space, ie that no material can settle, which is particularly important in the case of reactive materials.
  • the device according to the invention can be heated according to the properties of the pasty medium or for reasons related to the application / operation. For this purpose, holes for receiving one or more heating cartridges and for receiving a temperature sensor can be provided at certain points of the device.
  • the volume change device has a displacement body which forms an inner wall region of the storage space and is held in a central position under the action of a pretensioning device at normal pressure of the medium.
  • the displacement body itself can be designed as a needle which projects into the storage space and is connected to a piston which is movably arranged in a cylinder.
  • the needle itself can in turn be designed to bear against a needle seat arranged in the entrance area of the storage space, so that there is the possibility of being able to close the storage space on the input side by means of the displacement body.
  • the preload on the displacement body can preferably be applied by a preload spring.
  • the characteristic curve of the spring and a possible adjustability of the preload of the spring are individually matched to possible different material characteristics of the pasty medium (viscosity, flow behavior, thixotropy, compressibility or the like).
  • the device for applying pasty media has an application head, designated overall by 1.
  • the application head 1 is fed pasty medium to be applied from the direction of arrow C via a feed connection designated 2.
  • the medium then enters through a channel 3 into a storage space 4 and is then fed to a material space 5 which opens into an outlet nozzle denoted by 6, from which the pasty medium can exit in the direction of arrow D when the outlet nozzle is open.
  • the outlet nozzle is controlled by means of a needle 7, which in each case is halved in FIG. 2 in an open position and in a closed position is drawn. In the open position the needle bears the reference number 7 and in the closed position the reference number 7 '.
  • the needle axis is designated 8.
  • a cylinder 9 is provided in the application head 1, in which a piston 10 is displaceably guided.
  • the piston 10 carries the needle 7 on its lower side, as shown in the drawing.
  • the position of the piston when the outlet valve 6 is open is denoted by 10, and the position of the piston when the outlet valve is closed is denoted by 10 '.
  • the piston side opposite the needle 7 is supported by a biasing spring 11, which in its position corresponding to the closed position of the exhaust valve is designated 11 '.
  • the spring 11 can be adjusted in its pretension by means of a schematically represented and designated 12 adjusting screw.
  • a pneumatic or hydraulic medium can be supplied to the piston chambers 13 and 14 lying on both sides of the end faces of the piston 10 via supply or outlet openings 15 and 16.
  • a volume change device designated overall by 21, is assigned to the storage space 4.
  • the volume change device has a displacement body designed as a needle 22, which projects into the displacement space 4 with its end region shown on the right in the drawing.
  • the needle 22 is shown divided, 22 being a central position of the needle and 22 'a position in which an end region 23 bears against a needle seat 24 provided at the left end of the channel 3.
  • the needle 22 is attached to a piston 25, which in turn is divided is shown.
  • the piston 25 In the position 22 'of the needle which closes the channel 3, the piston bears the reference number 25' in its corresponding position.
  • the piston 25 is biased by a spring designated by 26, which bears the reference number 26 'in its position corresponding to the position 22' of the needle.
  • the spring 26 is adjustable in its pretension via an adjusting screw 27.
  • a pneumatic or hydraulic medium can be fed to a piston chamber 28 via a feed opening 29. The medium can also be drained through the same opening.
  • the opening 29 is connected to the line 18 via a line 30 and to the line 17 via a line 31.
  • a proportional valve, designated 32, is provided in line 30.
  • the piston chamber 33 opposite the piston chamber 28 communicates with the atmosphere via a bore 34.
  • the device works as follows: In the rest position, the needle forming the displacement body bears against the needle seat 24 in its position 22 ', as a result of which the storage space 4 is blocked off from a material inflow from the direction of the arrow C. The needle is held in its position 22 'by the action of a pneumatic or hydraulic medium (gas, air, liquid) which is fed to the piston chamber 28 through the opening 29.
  • a pneumatic or hydraulic medium gas, air, liquid
  • the other piston In the rest position, the other piston also presses in its position 10 'via the associated needle in its position 7' onto the needle seat of the outlet nozzle 6, designated 35, and thus closes the outlet.
  • This piston is also held in position 10 'by a pneumatic or hydraulic locking energy (gas, air, liquid) which enters the piston chamber 9 through the opening 15.
  • the piston chamber 28 is emptied via the connection 29. Since the piston chamber 33 is connected to the atmosphere via the bore 34, ambient air can flow into the piston chamber 23 when the piston 25 moves to the left in accordance with the drawing. Simultaneously with this or, depending on the material, with a time delay, the needle 7 is brought into the open position by emptying the chamber 13 via the connection 15 and venting the chamber 14 via the connection 16.
  • the connections 15 and 16 can be actuated via the proportional valve 20 or via a four-way valve, an adjustment being possible by actuating the adjusting screw 12 and / or by adjusting an orifice 36 in the area of the outlet nozzle 6.
  • the device can also be used to produce different cross-sections of the medium to be applied or even identical or intentionally different cross-sections of the medium to be applied with different movement speeds of the outlet nozzle above the corresponding object with uniform movement.
  • Information about the speed of movement of the object relative to the device (or vice versa) can be supplied to the device via analog inputs, for example.
  • the needle 22 Due to the effect of the dynamic pressure in the area of the feed opening 2, the needle 22 is shifted from its position 22 'to the left, as shown in the drawing, counter to the pressure of the spring 26. This increases the volume of the storage space 4, which reduces the pressure in the pantry 4 has the consequence. In this way, excess material resulting from the dynamic pressure discharge in the storage chamber 4 is compensated.
  • the needle 22 moves to the right when the pressure is reduced, which leads to a reduction in the volume of the storage space 4 and a corresponding increase in pressure.
  • the application process of the pasty medium is brought into a "dynamic balance".
  • the process of increasing or decreasing the volume is basically comparable to opening the outlet valve 6, but the pressure difference is much smaller in each case.
  • the “middle position” set at normal pressure of the supplied medium is determined by the biasing force of the spring 26.
  • this pretensioning force can be increased by a hydraulic or pneumatic medium, which can be supplied to the piston chamber 28 via the connection 26 and whose pretensioning force can be set via the proportional valve 32.
  • a proportional valve is not absolutely necessary.
  • the application process of pasty medium is ended in that the control valve 19 moves the piston 10 into the position labeled 10 'and the piston 25 into the position labeled 25' Position are moved.
  • the movement can take place simultaneously or with a time delay.
  • the needles 7 and 22 are pressed against their needle seats 36 and 24, respectively.

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Abstract

The applicator has a material storage chamber (4), which is located between feed connection (2) and ejector nozzle (6), in material flow direction. The chamber has an associated volume adjuster. When the pressure in the incoming material rises, the chamber volume is increased, and decreased, when the pressure drops, to compensate for pressure variations in the material. The volume adjuster has a displacement body. This forms part of an inner chamber wall, and is maintained in a central position by a pretension unit, when the material is at normal pressure. The body is a needle (22), which engages on a seat (24) near the chamber intake.

Description

Die Erfindung betrifft eine Vorrichtung zum Aufbringen pastöser Medien mit einem Zuführanschluß für das aufzubringende, unter Druck zugeführte Medium und mit einem Vorratsraum, aus dem das Medium aus einer Austrittsdüse aus der Vorrichtung austritt.The invention relates to a device for applying pasty media with a feed connection for the medium to be applied, which is supplied under pressure, and with a storage space from which the medium exits the device from an outlet nozzle.

Bei den aufzubringenden pastösen Medien kann es sich beispielsweise um Klebstoffe handeln, die beispielsweise bei der Herstellung von Kraftfahrzeugen in Form streifenförmiger Beschichtungen aufgebracht werden und zur Befestigung bzw. Anbringung von Bauteilen, wie etwa Windschutzscheiben, dienen. Die Zuführung des aufzubringenden pastösen Mediums erfolgt dabei von einem Vorratsbehältnis aus, wobei der den Transport bewerkstelligende Druck von einer Pumpe erzeugt wird.The pasty media to be applied can be, for example, adhesives which are applied, for example, in the form of strip-shaped coatings in the production of motor vehicles and are used for fastening or attaching components, such as windshields. The paste-like medium to be applied is supplied from a storage container, the pressure which brings about the transport being generated by a pump.

Um zu verhindern, daß sich infolge der Pulsation der Pumpe auftretende Druckdifferenzen an dem aus der Austrittsdüse austretenden pastösen Medium bemerkbar machen, was z.B. zur Folge haben kann, daß die zu erstellende Beschichtung ungleichmäßig ist, ist es aus der Veröffentlichung DE-GM 86 33 673.8 bekannt, daß das von der Pumpe herangeführte pastöse Medium zunächst einem Vorratsraum zugeführt wird, von dem aus das Medium mit einem weitgehend konstanten Druck zur Austrittsdüse geleitet wird. Der Vorratsraum der bekannten Vorrichtung weist eine einzige Öffnung auf, die zeitlich nacheinander zunächst als Zuführanschluß zur Befüllung des Vorratsraums und dann anschließend zum Austritt des Mediums durch eine Austrittsdüse dient. Das pastöse Medium wird dem Vorratsraum in einer solchen Menge zugeführt, die dem Bedarf eines bestimmten Auftrags-Arbeitszyklus entspricht. Erst nachdem der Füllvorgang des Vorratsraumes abgeschlossen ist, kann das Auftragen des pastösen Mediums durch Öffnen der Austrittsdüse erfolgen. Die bekannte Vorrichtung arbeitet somit diskontinuierlich und ist steuerungstechnisch kompliziert und daher aufwendig und teuer.In order to prevent pressure differences occurring due to the pulsation of the pump from becoming noticeable on the pasty medium emerging from the outlet nozzle, which can have the consequence, for example, that the coating to be produced is uneven, it is from the publication DE-GM 86 33 673.8 It is known that the pasty medium brought in by the pump is first fed to a storage space, from which the medium is conducted to the outlet nozzle at a largely constant pressure. The storage space of the known device has a single opening, which is used in succession first as a feed connection for filling the storage space and then subsequently for the medium to exit through an outlet nozzle. The pasty medium is supplied to the storage room in an amount that corresponds to the requirements of a specific order work cycle. Only after the storage room has been filled, the pasty medium can be applied by opening the outlet nozzle. The known device thus operates discontinuously and is complicated in terms of control technology and is therefore complex and expensive.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art dahingehend zu verbessern, daß sie kontinuierlich arbeitet und von einfachem Aufbau ist.The invention has for its object to improve a device of the type mentioned in that it works continuously and has a simple structure.

Zur Lösung dieser Aufgabe ist erfindungsgemäß vorgesehen, daß der Vorratsraum - in Materialfließrichtung gesehen - zwischen dem Zuführanschluß und der Austrittsdüse angeordnet ist, und dem Vorratsraum eine derartig ausgebildete Volumenveränderungseinrichtung zugeordnet ist, daß bei einem Druckanstieg in dem herangeführten Medium eine Volumenvergrößerung und bei einem Druckabfall in dem herangeführten Medium eine Volumenverringerung des Vorratsraums in einer Druckschwankungen in dem herangeführten Medium kompensierenden Weise erfolgt.To achieve this object, it is provided according to the invention that the storage space - seen in the material flow direction - is arranged between the feed connection and the outlet nozzle, and the storage space is associated with a volume change device designed in such a way that when the pressure in the medium brought up increases in volume and in the case of a pressure drop in the medium introduced is a volume reduction of the storage space in a pressure fluctuations in the medium introduced compensating manner.

Bei der Erfindung wird somit der Vorratsraum vom Medium durchströmt, wobei der Vorratsraum somit stets eine definierte Menge des pastösen Mediums enthält. Die Vorrichtung arbeitet kontinuierlich. Bei einer Druckerhöhung des kontinuierlich über den Zuführanschluß zugeführten pastösen Mediums wird das Volumen des Vorratsraums in einer derartigen Weise vergrößert, daß hierdurch der Druckanstieg kompensiert wird, so daß das Medium unabhängig von dem Druckanstieg an der Zuführseite des Vorratsraums mit konstantem Druck aus der Austrittsdüse austritt. Verringert sich andererseits der Druck des zugeführten Mediums, so verkleinert sich durch Wirkung der Volumenveränderungseinrichtung das Volumen des Vorratsraums, so daß dadurch die aufgetretene Druckabsenkung in dem pastösen Medium im Bereich der Austrittsdüse ebenfalls kompensiert ist.In the invention, the storage space is thus flowed through by the medium, the storage space thus always containing a defined amount of the pasty medium. The device works continuously. When the pressure of the pasty medium fed continuously via the feed connection is increased, the volume of the storage space is increased in such a way that the pressure rise is compensated for, so that the medium emerges from the outlet nozzle with constant pressure regardless of the pressure rise on the feed side of the storage space. If, on the other hand, the pressure of the supplied medium decreases, the volume of the storage space is reduced by the action of the volume changing device, so that the pressure drop in the pasty medium in the region of the outlet nozzle is also compensated.

Infolge der kontinuierlichen Betriebsweise der erfindungsgemäßen Vorrichtung treten keine negativen Taktzeiteinflüsse auf, so daß ein pastöses Medium gleichmäßig und kontrolliert aufgebracht werden kann. Die erfindungsgemäße Vorrichtung kann in einfacher Weise realisiert werden, was zu niedrigen Herstellungskosten führt. Bei der Erfindung ist weiterhin vorteilhaft, daß der Vorratsraum stets von dem aufzubringenden pastösen Medium durchströmt wird, d.h., daß sich kein Material absetzen kann, was insbesondere bei reaktiven Materialien wichtig ist. Die erfindungsgemäße Vorrichtung kann entsprechend den Eigenschaften des pastösen Mediums oder aus applikations-/operationsbedingten Gründen geheizt werden. Dazu können an bestimmten Stellen der Vorrichtung Bohrungen zur Aufnahme einer oder mehrerer Heizpatronen und zur Aufnahme eines Temperatursensors vorgesehen sein.As a result of the continuous mode of operation of the device according to the invention, there are no negative cycle time influences so that a pasty medium can be applied evenly and in a controlled manner. The device according to the invention can be implemented in a simple manner, which leads to low production costs. Another advantage of the invention is that the pasty medium to be applied always flows through the storage space, ie that no material can settle, which is particularly important in the case of reactive materials. The device according to the invention can be heated according to the properties of the pasty medium or for reasons related to the application / operation. For this purpose, holes for receiving one or more heating cartridges and for receiving a temperature sensor can be provided at certain points of the device.

In zweckmäßiger Ausgestaltung der Erfindung kann vorgesehen sein, daß die Volumenveränderungseinrichtung einen einen Innenwandbereich des Vorratsraums bildenden und unter Wirkung einer Vorspanneinrichtung bei Normaldruck des Mediums in einer Mittellage gehaltenen Verdrängungskörper aufweist. Der Verdrängungskörper selbst kann in vorzugsweiser Ausgestaltung der Erfindung als mit einem in einem Zylinder bewegbar angeordneten Kolben verbundene, in den Vorratsraum ragende Nadel ausgebildet sein. Die Nadel selbst kann wiederum zur Anlage gegen einen im Eingangsbereich des Vorratsraumes angeordneten Nadelsitz ausgebildet sein, so daß die Möglichkeit besteht, den Vorratsraum eingangsseitig durch den Verdrängungskörper abschließen zu können.In an expedient embodiment of the invention, it can be provided that the volume change device has a displacement body which forms an inner wall region of the storage space and is held in a central position under the action of a pretensioning device at normal pressure of the medium. In a preferred embodiment of the invention, the displacement body itself can be designed as a needle which projects into the storage space and is connected to a piston which is movably arranged in a cylinder. The needle itself can in turn be designed to bear against a needle seat arranged in the entrance area of the storage space, so that there is the possibility of being able to close the storage space on the input side by means of the displacement body.

Die Vorspannung auf den Verdrängungskörper kann vorzugsweise durch eine Vorspannfeder aufgebracht werden. Die Kennlinie der Feder und eine mögliche Einstellbarkeit der Vorspannung der Feder wird dabei auf mögliche unterschiedliche Materialcharakteristika des pastösen Mediums (Viskosität, Fließverhalten, Thixotrophie, Kompressibilität od. dgl.) individuell abgestimmt.The preload on the displacement body can preferably be applied by a preload spring. The characteristic curve of the spring and a possible adjustability of the preload of the spring are individually matched to possible different material characteristics of the pasty medium (viscosity, flow behavior, thixotropy, compressibility or the like).

In weiterer Ausbildung der Erfindung besteht die Möglichkeit, die Federvorspannung durch einen über ein Hydraulikmedium oder ein Pneumatikmedium aufgebrachten Druck zu unterstützen. Dabei ist dann in der Zuleitung des Hydraulik- und Pneumatikmediums an der dem Vorratsraum abgewandten Seite des Verdrängungskörpers ein Proportionalventil vorgesehen. Der zusätzliche Einsatz eines Proportionalventils ist aber nicht grundsätzlich notwendig, sondern hängt von Materialdaten des aufzubringenden pastösen Mediums ab. Der Einsatz eines Proportionalventils kann somit auch als Bereichserweiterung der Federkennlinie der Vorspannfeder angesehen werden.In a further embodiment of the invention, it is possible to support the spring preload by means of a pressure applied via a hydraulic medium or a pneumatic medium. A proportional valve is then provided in the supply line of the hydraulic and pneumatic medium on the side of the displacement body facing away from the storage space. However, the additional use of a proportional valve is not fundamentally necessary, but depends on the material data of the pasty medium to be applied. The use of a proportional valve can therefore also be seen as an extension of the spring characteristic of the preload spring.

Die Erfindung wird nachfolgend anhand des in der Zeichnung schematisch dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:

Fig. 1
eine Ansicht einer Vorrichtung zum Aufbringen pastöser Massen von der Austrittsdüse her gesehen;
Fig. 2
eine Längsschnittdarstellung der Vorrichtung gemäß Fig. 1, wobei der obere und der untere Bereich von Fig. 2 einen Schnitt längs der Linie II-II in Fig. 1, und der hiervon durch die strichpunktierten Linien A und B getrennte Mittelbereich von Fig. 2 einen Schnitt längs der Linie X-X in Fig. 1 zeigt.
The invention is explained in more detail below with reference to the exemplary embodiment shown schematically in the drawing. Show it:
Fig. 1
a view of a device for applying pasty masses seen from the outlet nozzle;
Fig. 2
2, a section along the line II-II in FIG. 1, and the central area of FIG. 2 separated by the dash-dotted lines A and B of FIG. 2, one Section along the line XX in Fig. 1 shows.

Die Vorrichtung zum Aufbringen pastöser Medien weist einen insgesamt mit 1 bezeichneten Applikationskopf auf. Dem Applikationskopf 1 wird aufzubringendes pastöses Medium aus der Pfeilrichtung C über einen mit 2 bezeichneten Zuführanschluß zugeführt. Das Medium tritt dann durch einen Kanal 3 in einen Vorratsraum 4 ein und wird dann einem Materialraum 5 zugeführt, welcher in eine mit 6 bezeichnete Austrittsdüse mündet, aus der das pastöse Medium bei geöffneter Austrittsdüse in Pfeilrichtung D austreten kann. Die Steuerung der Austrittsdüse erfolgt über eine Nadel 7, welche in Fig. 2 jeweils hälftig in einer Öffnungsstellung und in einer Schließstellung gezeichnet ist. In der Öffnungsstellung trägt die Nadel die Bezugsziffer 7 und in der Schließstellung die Bezugsziffer 7'. Die Nadelachse ist mit 8 bezeichnet. Weiterhin ist in dem Applikationskopf 1 ein Zylinder 9 vorgesehen, in welchem ein Kolben 10 verschiebbar geführt ist. Der Kolben 10 trägt an seiner entsprechend der Zeichnung unteren Seite die Nadel 7. Die Stellung des Kolbens bei geöffnetem Auslaßventil 6 ist mit 10 bezeichnet, und die Stellung des Kolbens bei geschlossenem Auslaßventil mit 10'. Die der Nadel 7 gegenüberliegende Kolbenseite ist durch eine Vorspannfeder 11 abgestützt, welche in ihrer der Schließstellung des Auslaßventils entsprechenden Position mit 11' bezeichnet ist. Die Feder 11 kann über eine schematisch dargestellte und mit 12 bezeichnete Einstellschraube in ihrer Vorspannung eingestellt werden. Den beidseitig der Stirnseiten des Kolbens 10 liegenden Kolbenkammern 13 und 14 kann über Zuführ- bzw. Austrittsöffnungen 15 und 16 ein pneumatisches oder hydraulisches Medium zugeführt werden. Die Zufuhr bzw. Ableitung des hydraulischen oder pneumatischen Mediums erfolgt über Leitungen 17 und 18, welche zu einem mit 19 bezeichneten Steuerventil führen. Ein Proportionalventil trägt die Bezugsziffer 20. Wie ersichtlich, kann durch Beaufschlagen entweder der Kolbenkammer 13 oder der Kolbenkammer 14 eine Bewegung des Kolbens 10 erfolgen und damit ein Öffnen bzw. Schließen des Auslaßventils 6 bewirkt werden.The device for applying pasty media has an application head, designated overall by 1. The application head 1 is fed pasty medium to be applied from the direction of arrow C via a feed connection designated 2. The medium then enters through a channel 3 into a storage space 4 and is then fed to a material space 5 which opens into an outlet nozzle denoted by 6, from which the pasty medium can exit in the direction of arrow D when the outlet nozzle is open. The outlet nozzle is controlled by means of a needle 7, which in each case is halved in FIG. 2 in an open position and in a closed position is drawn. In the open position the needle bears the reference number 7 and in the closed position the reference number 7 '. The needle axis is designated 8. Furthermore, a cylinder 9 is provided in the application head 1, in which a piston 10 is displaceably guided. The piston 10 carries the needle 7 on its lower side, as shown in the drawing. The position of the piston when the outlet valve 6 is open is denoted by 10, and the position of the piston when the outlet valve is closed is denoted by 10 '. The piston side opposite the needle 7 is supported by a biasing spring 11, which in its position corresponding to the closed position of the exhaust valve is designated 11 '. The spring 11 can be adjusted in its pretension by means of a schematically represented and designated 12 adjusting screw. A pneumatic or hydraulic medium can be supplied to the piston chambers 13 and 14 lying on both sides of the end faces of the piston 10 via supply or outlet openings 15 and 16. The supply or discharge of the hydraulic or pneumatic medium takes place via lines 17 and 18, which lead to a control valve designated 19. A proportional valve bears the reference number 20. As can be seen, by acting on either the piston chamber 13 or the piston chamber 14, a movement of the piston 10 can take place and thus an opening or closing of the outlet valve 6 can be effected.

Dem Vorratsraum 4 ist eine insgesamt mit 21 bezeichnete Volumenveränderungseinrichtung zugeordnet. Die Volumenveränderungseinrichtung weist einen als Nadel 22 ausgebildeten Verdrängungskörper auf, der mit seinem in der Zeichnung rechts dargestellten Stirnendbereich in den Verdrängungsraum 4 hineinragt. Die Nadel 22 ist geteilt dargestellt, wobei mit 22 eine Mittelstellung der Nadel dargestellt ist und mit 22' eine Position, in der ein Stirnendbereich 23 gegen einen am linken Ende des Kanals 3 vorgesehenen Nadelsitz 24 anliegt. Die Nadel 22 ist in ihrem dem Vorratsraum 4 abgewandten Endbereich an einem Kolben 25 angebracht, welcher wiederum geteilt dargestellt ist. In der den Kanal 3 abschließenden Stellung 22' der Nadel trägt der Kolben in seiner entsprechenden Stellung die Bezugsziffer 25'. Der Kolben 25 ist über eine mit 26 bezeichnete Feder vorgespannt, welche in ihrer der Position 22' der Nadel entsprechenden Stellung die Bezugsziffer 26' trägt. Die Feder 26 ist in ihrer Vorspannung über eine Einstellschraube 27 einstellbar. Einem Kolbenraum 28 ist ein pneumatisches oder hydraulisches Medium über eine Zufuhröffnung 29 zuführbar. Durch die gleiche Öffnung kann das Medium auch wieder abgeleitet werden. Die Öffnung 29 steht über eine Leitung 30 mit der Leitung 18 und über eine Leitung 31 mit der Leitung 17 in Verbindung. In der Leitung 30 ist ein mit 32 bezeichnetes Proportionalventil vorgesehen. Die der Kolbenkammer 28 gegenüberliegende Kolbenkammer 33 steht über eine Bohrung 34 mit der Atmosphäre in Verbindung.A volume change device, designated overall by 21, is assigned to the storage space 4. The volume change device has a displacement body designed as a needle 22, which projects into the displacement space 4 with its end region shown on the right in the drawing. The needle 22 is shown divided, 22 being a central position of the needle and 22 'a position in which an end region 23 bears against a needle seat 24 provided at the left end of the channel 3. In its end region facing away from the storage space 4, the needle 22 is attached to a piston 25, which in turn is divided is shown. In the position 22 'of the needle which closes the channel 3, the piston bears the reference number 25' in its corresponding position. The piston 25 is biased by a spring designated by 26, which bears the reference number 26 'in its position corresponding to the position 22' of the needle. The spring 26 is adjustable in its pretension via an adjusting screw 27. A pneumatic or hydraulic medium can be fed to a piston chamber 28 via a feed opening 29. The medium can also be drained through the same opening. The opening 29 is connected to the line 18 via a line 30 and to the line 17 via a line 31. A proportional valve, designated 32, is provided in line 30. The piston chamber 33 opposite the piston chamber 28 communicates with the atmosphere via a bore 34.

Die Arbeitsweise der Vorrichtung ist wie folgt:
In Ruhestellung liegt die den Verdrängungskörper bildende Nadel in ihrer Position 22' gegen den Nadelsitz 24 an, wodurch der Vorratsraum 4 gegen einen Materialzustrom aus Pfeilrichtung C abgesperrt ist. Die Nadel wird in ihrer Stellung 22' durch Wirkung eines pneumatischen oder hydraulischen Mediums (Gas, Luft, Flüssigkeit) gehalten, welches dem Kolbenraum 28 durch die Öffnung 29 zugeführt wird.The device works as follows:
In the rest position, the needle forming the displacement body bears against the needle seat 24 in its position 22 ', as a result of which the storage space 4 is blocked off from a material inflow from the direction of the arrow C. The needle is held in its position 22 'by the action of a pneumatic or hydraulic medium (gas, air, liquid) which is fed to the piston chamber 28 through the opening 29.

In Ruhestellung drückt außerdem der andere Kolben in seiner Position 10' über die zugeordnete Nadel in ihrer Position 7' auf den mit 35 bezeichneten Nadelsitz der Austrittsdüse 6 und verschließt damit den Austritt. Auch dieser Kolben wird durch eine pneumatische oder hydraulische Zuhalteenergie (Gas, Luft, Flüssigkeit), die durch die Öffnung 15 in den Kolbenraum 9 eintritt, in der Position 10' gehalten.In the rest position, the other piston also presses in its position 10 'via the associated needle in its position 7' onto the needle seat of the outlet nozzle 6, designated 35, and thus closes the outlet. This piston is also held in position 10 'by a pneumatic or hydraulic locking energy (gas, air, liquid) which enters the piston chamber 9 through the opening 15.

In dem vorstehend beschriebenen geschlossenen Zustand ist der in dem Zuführungsanschluß 2 herrschende Druck des über eine Druckpumpe zugeführten pastösen Mediums (= Staudruck) erheblich größer als der Druck des in dem Bereich zwischen dem Zufuhranschluß und der Austrittsdüse 6 befindlichen pastösen Mediums.In the closed state described above, the pressure prevailing in the supply connection 2 of the pasty medium supplied via a pressure pump (= dynamic pressure) is considerable greater than the pressure of the pasty medium located in the area between the supply connection and the outlet nozzle 6.

Zu Beginn des Aufbringvorganges des pastösen Mediums wird die Kolbenkammer 28 über den Anschluß 29 entleert. Da die Kolbenkammer 33 über die Bohrung 34 mit der Atmosphäre verbunden ist, kann bei einer Bewegung des Kolbens 25 entsprechend der Zeichnung nach links Umgebungsluft in den Kolbenraum 23 einströmen. Gleichzeitig damit oder - materialabhängig - zeitversetzt hierzu wird die Nadel 7 durch Entleeren der Kammer 13 über den Anschluß 15 sowie Belüften der Kammer 14 über den Anschluß 16 in die Öffnungsstellung gebracht. Das Ansteuern der Anschlüsse 15 und 16 kann über das Proportionalventil 20 oder über ein Vierwegeventil erfolgen, wobei eine Einstellung durch Betätigung der Einstellschraube 12 und/oder durch Verstellung einer Blende 36 im Bereich der Austrittsdüse 6 erfolgen kann.At the beginning of the application process of the pasty medium, the piston chamber 28 is emptied via the connection 29. Since the piston chamber 33 is connected to the atmosphere via the bore 34, ambient air can flow into the piston chamber 23 when the piston 25 moves to the left in accordance with the drawing. Simultaneously with this or, depending on the material, with a time delay, the needle 7 is brought into the open position by emptying the chamber 13 via the connection 15 and venting the chamber 14 via the connection 16. The connections 15 and 16 can be actuated via the proportional valve 20 or via a four-way valve, an adjustment being possible by actuating the adjusting screw 12 and / or by adjusting an orifice 36 in the area of the outlet nozzle 6.

Die Vorrichtung kann auch eingesetzt werden, um bei gleichförmiger Bewegung unterschiedliche Querschnitte des aufzubringenden Mediums oder aber auch gleiche oder gewollt unterschiedliche Querschnitte des aufzubringenden Mediums bei unterschiedlichen Bewegungsgeschwindigkeiten der Austrittsdüse über dem entsprechenden Objekt zu erzeugen. Angaben über die Bewegungsgeschwindigkeit des Objektes relativ zu der Vorrichtung (oder umgekehrt) können beispielsweise der Vorrichtung über analoge Eingänge zugeführt werden.The device can also be used to produce different cross-sections of the medium to be applied or even identical or intentionally different cross-sections of the medium to be applied with different movement speeds of the outlet nozzle above the corresponding object with uniform movement. Information about the speed of movement of the object relative to the device (or vice versa) can be supplied to the device via analog inputs, for example.

Durch Wirkung des Staudrucks im Bereich der Zuführöffnung 2 wird die Nadel 22 aus ihrer Position 22' entsprechend der zeichnerischen Darstellung nach links verschoben, und zwar entgegen dem Druck der Feder 26. Dadurch wird das Volumen des Vorratsraums 4 vergrößert, was eine Verringerung des Drucks in der Vorratskammer 4 zur Folge hat. Auf diese Weise wird ein aus der Staudruckentladung resultierender Materialüberschuß in der Vorratskammer 4 kompensiert.Due to the effect of the dynamic pressure in the area of the feed opening 2, the needle 22 is shifted from its position 22 'to the left, as shown in the drawing, counter to the pressure of the spring 26. This increases the volume of the storage space 4, which reduces the pressure in the pantry 4 has the consequence. In this way, excess material resulting from the dynamic pressure discharge in the storage chamber 4 is compensated.

Während des Aufbringens pastöser Medien durch die Austrittsdüse 6 wird kontinuierlich neues pastöses Medium über eine Pumpe (nicht dargestellt) dem Zufuhranschluß 2 zugeführt. Durch die Pulsation der Pumpe entstehende Druckdifferenzen werden bei der erfindungsgemäßen Vorrichtung ausgeglichen, und zwar dadurch, daß die insgesamt mit 21 bezeichnete Volumenveränderungseinrichtung, welche bei "Normaldruck" des pastösen Mediums eine Mittellage einnimmt, die etwa der in Fig. 2 gezeichneten Position entspricht, bei einem Druckanstieg des aus Pfeilrichtung C herangeführten pastösen Mediums entgegen der Vorspannkraft der Feder 26 nach links bewegt wird, was eine Volumenvergrößerung des Vorratsraums 4 und damit einen entsprechenden Druckabfall zur Folge hat. In entsprechender Weise bewegt sich die Nadel 22 bei einer Druckverringerung nach rechts, was zu einer Verkleinerung des Volumens des Vorratsraums 4 und einem entsprechenden Druckanstieg führt. Auf diese Weise wird der Auftragvorgang des pastösen Mediums in ein "dynamisches Gleichgewicht" versetzt. Der Vorgang der Volumenvergrößerung bzw. Volumenverkleinerung ist grundsätzlich mit dem Öffnen des Auslaßventils 6 vergleichbar, wobei jedoch die Druckdifferenz jeweils wesentlich geringer ausfällt.During the application of pasty media through the outlet nozzle 6, new pasty medium is continuously fed to the feed connection 2 via a pump (not shown). Pressure fluctuations caused by the pulsation of the pump are compensated for in the device according to the invention by the fact that the volume change device, designated overall by 21, which assumes a central position at "normal pressure" of the pasty medium, which corresponds approximately to the position shown in FIG. 2 a pressure increase of the pasty medium brought in from the direction of arrow C is moved to the left against the biasing force of the spring 26, which results in an increase in volume of the storage space 4 and thus a corresponding pressure drop. In a corresponding manner, the needle 22 moves to the right when the pressure is reduced, which leads to a reduction in the volume of the storage space 4 and a corresponding increase in pressure. In this way, the application process of the pasty medium is brought into a "dynamic balance". The process of increasing or decreasing the volume is basically comparable to opening the outlet valve 6, but the pressure difference is much smaller in each case.

Bei dem dargestellten Ausführungsbeispiel wird die bei Normaldruck des zugeführten Mediums eingestellte "Mittellage" durch die Vorspannkraft der Feder 26 bestimmt. Zusätzlich dazu kann diese Vorspannkraft durch ein hydraulisches oder pneumatisches Medium erhöht werden, welches der Kolbenkammer 28 über den Anschluß 26 zugeführt werden kann, und dessen Vorspannkraft über das Proportionalventil 32 einstellbar ist. Wie bereits erwähnt, ist aber der zusätzliche Einsatz eines Proportionalventils nicht zwingend erforderlich.In the exemplary embodiment shown, the “middle position” set at normal pressure of the supplied medium is determined by the biasing force of the spring 26. In addition to this, this pretensioning force can be increased by a hydraulic or pneumatic medium, which can be supplied to the piston chamber 28 via the connection 26 and whose pretensioning force can be set via the proportional valve 32. As already mentioned, the additional use of a proportional valve is not absolutely necessary.

Der Applikationsvorgang pastösen Mediums wird dadurch beendet, daß über das Steuerventil 19 der Kolben 10 in die mit 10' bezeichnete Stellung und der Kolben 25 in die mit 25' bezeichnete Stellung bewegt werden. Die Bewegung kann gleichzeitig oder zeitversetzt erfolgen. Dadurch werden die Nadeln 7 und 22 gegen ihre Nadelsitze 36 bzw. 24 gedrückt.The application process of pasty medium is ended in that the control valve 19 moves the piston 10 into the position labeled 10 'and the piston 25 into the position labeled 25' Position are moved. The movement can take place simultaneously or with a time delay. As a result, the needles 7 and 22 are pressed against their needle seats 36 and 24, respectively.

Claims (8)

Vorrichtung zum Aufbringen pastöser Medien mit einem Zuführanschluß für das aufzubringende, unter Druck zugeführte Medium, und mit einem Vorratsraum, aus dem das Medium durch eine Austrittsdüse aus der Vorrichtung austritt, dadurch gekennzeichnet, daß der Vorratsraum (4) - in Materialflußrichtung gesehen - zwischen dem Zuführanschluß (2) und der Austrittsdüse (6) angeordnet ist, und dem Vorratsraum (4) eine derartig ausgebildete Volumenveränderungseinrichtung (21) zugeordnet ist, daß bei einem Druckanstieg in dem herangeführten Medium eine Volumenvergrößerung und bei einem Druckabfall in dem herangeführten Medium eine Volumenverringerung des Vorratsraums in einer Druckschwankungen in dem herangeführten Medium kompensierenden Weise erfolgt.Device for applying pasty media with a feed connection for the medium to be applied, which is supplied under pressure, and with a storage space from which the medium exits the device through an outlet nozzle, characterized in that the storage space (4) - viewed in the direction of material flow - between the Supply port (2) and the outlet nozzle (6) is arranged, and the storage space (4) is associated with a volume change device (21) designed in such a way that when the pressure in the supplied medium increases, the volume increases and when the pressure decreases in the supplied medium, the volume decreases Storage space in a pressure fluctuations in the medium introduced compensating manner. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Volumenveränderungseinrichtung (21) einen einen Innenwandbereich des Vorratsraums (4) bildenden und unter Wirkung einer Vorspanneinrichtung bei Normaldruck des Mediums in einer Mittellage gehaltenen Verdrängungskörper aufweist.Apparatus according to claim 1, characterized in that the volume changing device (21) has a displacement body which forms an inner wall region of the storage space (4) and is held in a central position under the action of a pretensioning device at normal pressure of the medium. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Verdrängungskörper als mit einem in einem Zylinder bewegbar angeordneten Kolben (25) verbundene, in den Vorratsraum (4) ragende Nadel (22) ausgebildet ist.Apparatus according to claim 2, characterized in that the displacement body is designed as a needle (22) which is connected to a piston (25) which is movably arranged in a cylinder and projects into the storage space (4). Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Nadel (22) zur Anlage gegen einen im Eingangsbereich des Vorratsraums (4) angeordneten Nadelsitz (24) ausgebildet ist.Apparatus according to claim 3, characterized in that the needle (22) is designed to bear against a needle seat (24) arranged in the entrance area of the storage space (4). Vorrichtung nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß die Vorspannung durch eine Vorspannfeder (26) aufgebracht wird.Device according to one of claims 2 to 4, characterized in that the bias is applied by a biasing spring (26). Vorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß die Vorspannung durch ein Hydraulikmedium aufgebracht wird.Device according to one of claims 2 to 5, characterized in that the bias is applied by a hydraulic medium. Vorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß die Vorspannung durch ein Pneumatikmedium aufgebracht wird.Device according to one of claims 2 to 5, characterized in that the pretension is applied by a pneumatic medium. Vorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß in der Zuleitung (30) für das Hydraulikmedium bzw. für das Pneumatikmedium zur Zufuhr zu der dem Vorratsraum (4) abgewandten Seite des Verdrängungskörpers ein Proportionalventil (32) vorgesehen ist.Apparatus according to claim 6 or 7, characterized in that a proportional valve (32) is provided in the feed line (30) for the hydraulic medium or for the pneumatic medium for supply to the side of the displacement body facing away from the storage space (4).
EP19960105621 1995-05-06 1996-04-10 Device for applying a pasty fluid Expired - Lifetime EP0747132B1 (en)

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DE1995116697 DE19516697C2 (en) 1995-05-06 1995-05-06 Device for applying pasty media

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DE102014112977A1 (en) * 2014-09-09 2016-03-10 Karlsruher Institut für Technologie Method and device for intermittent coating
CN111515080B (en) * 2020-04-09 2021-04-13 深圳市运泰利自动化设备有限公司 Method for simultaneously calibrating and compensating double-point rubber needle tube

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DE102007021634B3 (en) * 2007-05-09 2008-10-23 Technotrans Ag Dispensing device comprises container with outlet valve
RU2534074C2 (en) 2009-05-06 2014-11-27 Дюрр Системз Гмбх Structural element of coating applicator plant with at least one retainer
DE102009020077A1 (en) 2009-05-06 2010-11-11 Dürr Systems GmbH Coating agent device and coating device
WO2011009641A1 (en) 2009-07-24 2011-01-27 Dürr Systems GmbH Rotary atomizer comprising an atomizer bell and a retainer
DE102012110818A1 (en) 2012-11-12 2014-05-15 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Device for applying pasty or viscous medium on window pane surface of motor vehicle, has triangular cut-out portions that are formed in outlet opening of application nozzle, and are arranged diametrically
DE102015121109A1 (en) 2015-12-04 2017-06-08 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Device for applying a fluid

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN100381213C (en) * 1998-12-28 2008-04-16 武藏工业株式会社 Method and device for injecting fixed quantity of liquid
DE102014112977A1 (en) * 2014-09-09 2016-03-10 Karlsruher Institut für Technologie Method and device for intermittent coating
CN111515080B (en) * 2020-04-09 2021-04-13 深圳市运泰利自动化设备有限公司 Method for simultaneously calibrating and compensating double-point rubber needle tube

Also Published As

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EP0747132A3 (en) 1996-12-18
DE19516697C2 (en) 1998-12-17
EP0747132B1 (en) 2001-07-18
DE19516697A1 (en) 1996-11-07

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