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EP0580547A1 - Mouthpiece for squeezing out devices for two component masses - Google Patents

Mouthpiece for squeezing out devices for two component masses Download PDF

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Publication number
EP0580547A1
EP0580547A1 EP93810389A EP93810389A EP0580547A1 EP 0580547 A1 EP0580547 A1 EP 0580547A1 EP 93810389 A EP93810389 A EP 93810389A EP 93810389 A EP93810389 A EP 93810389A EP 0580547 A1 EP0580547 A1 EP 0580547A1
Authority
EP
European Patent Office
Prior art keywords
outlet opening
mouthpiece
way valve
mouthpiece according
mixing tube
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
EP93810389A
Other languages
German (de)
French (fr)
Other versions
EP0580547B1 (en
Inventor
Volker Kopp
Werner Moser
Jürgen Kortenkamp
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.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP0580547A1 publication Critical patent/EP0580547A1/en
Application granted granted Critical
Publication of EP0580547B1 publication Critical patent/EP0580547B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F2025/91—Direction of flow or arrangement of feed and discharge openings
    • B01F2025/918—Counter current flow, i.e. flows moving in opposite direction and colliding

Definitions

  • the invention relates to a mouthpiece for dispensing devices which serve the dispensing of two-component masses, with a mixing tube which is provided for connection to a dispensing nozzle on the device with two outlet openings for the individual components.
  • An extrusion device for two-component compositions is known, for example, from CH-PS 670 580.
  • such a device usually has a dispensing nozzle which is provided with an outlet opening for one component each.
  • the individual components are separated from each other inside the device and enter a mouthpiece through the respective outlet openings, which is connected to the device-side dispensing nozzle.
  • the two components are mixed within the mouthpiece, which is decisive for the final hardening.
  • the individual components are pressed out by applying a certain pressure generated in the device.
  • a print can be applied manually or with additionally supplied print media. If such pressure is applied without -
  • a mouthpiece with hardened components is removed prematurely, there is a risk that one of the components will strike back through the outlet opening of the other component into the extrusion device.
  • the components can be mixed within the extrusion device, so that curing takes place, for example, in the area of the extrusion mechanisms, which can lead to malfunctions in the extrusion device.
  • Such a fault is only possible by time-consuming dismantling and cleaning of the dispenser.
  • the components are kicked back arbitrarily, mostly depending on the viscosity differences and any pressure differences between the individual components.
  • the invention has for its object to provide a mouthpiece for a squeezing device of the type described above, with which it is avoided that malfunctions caused by a kickback of component parts in the squeezing device occur.
  • the object is achieved in that at least one one-way valve cooperating with one of the outlet openings and allowing the passage of the respective component is provided in the mixing tube.
  • the mouthpiece according to the invention with at least one one-way valve, which cooperates with one of the outlet openings, has the consequence that at least one of the two components must first pass through the one-way valve and then mixed with the other component in the mixing tube.
  • the one-way valve only opens as long as the component flows through.
  • the one-way valve closes, so that no further portion of the component can escape and, moreover, no portion of the other component comes from the mixing tube to the outlet opening assigned to the one-way valve. If the squeezing process is interrupted for a certain time, so that the mixed components harden in the mouthpiece, this results in that at the point where the individual components flow together for the first time, i.e.
  • the curing takes place first.
  • a portion of cured components can thus form, in particular around the open one-way valve, which then has the consequence that the mixing tube is closed to the device by the portion of the cured components.
  • This mouthpiece according to the invention is also a disposable part, which has to be removed from the pressing device after the pressing process has been interrupted. For the satisfactory functioning of the further squeezing process, it is necessary as before to provide the dispensing nozzle of the squeezing device with a new mouthpiece.
  • a one-way valve is expediently arranged at a distance from the connection point to a first outlet opening on a pipe section which is mounted coaxially in the mixing tube and can be connected to the corresponding outlet opening. It is thereby achieved that the two outlet openings on the device side are separated from one another, which is particularly advantageous if only one of the outlet openings interacts with a one-way valve. Only after the component passing through the pipe section has also passed through the one-way valve is it mixed with the other component located in the mixing pipe.
  • the pipe section is preferably arranged coaxially within the mixing pipe. This is the pipe section for the passage of one component and the annular space between the tube piece and the mixing tube are provided for the passage of the other component.
  • the annular space between the tube piece and the mouthpiece can at most be penetrated by ribs, which on the one hand serve to stabilize the tube piece, but on the other hand allow enough space for the passage of the one component between the tube piece and the mixing tube.
  • one or more openings on the pipe section that can be covered by an elastically deformable part are suitable as one-way valves.
  • These openings are advantageously radial passages which are arranged in the mouth region of the pipe section.
  • An elastically deformable part for these, for example, radially arranged passages is expediently an elastic sheath which surrounds the openings.
  • This elastic sleeve preferably has the shape of a tube.
  • the elastic sleeve is connected at its end area facing the mouth of the mixing tube to the mouth area of the pipe section and can be elastically deformed at its opposite end area by the pressure of the component flowing through the pipe section.
  • a quasi deflection baffle is thus formed for the component flowing through the pipe section, which on the one hand has an advantageous effect on the mixing process and on the other hand also has an advantageous effect on the closure to be formed by a proportion of hardened components.
  • a further one-way valve is expediently arranged in the area of the connection point to a second outlet opening.
  • this further one-way valve is arranged in the area of the connection point, there is still a spatial separation of the outlet points, ie in the present case the one-way valves.
  • the further one-way valve preferably has a bellows that is axially compressible by the pressure of the component flowing through the second outlet opening.
  • a bellows acts in the sense of an elastically deformable part analogous to the description in connection with the first one-way valve, only with the difference that the elastic bellows are axially deformable and the elastic sleeve is radially deformable. Due to the internal stress, the bellows covers the second outlet opening until compression occurs due to the pressure of the component flowing out through the outlet opening.
  • the mixing tube is advantageously made so long that the one-way valve or valves are sufficiently protruded from the mixing tube. This creates a sufficiently long mixing section, which guarantees sufficient mixing of the individual components.
  • the mouthpiece according to the invention is advantageously used in connection with an extrusion device which has a first outlet opening opening into the mixing tube and, upstream of this first outlet opening, coaxially in front of this first outlet opening and a second outlet opening opening into the tube section.
  • a device of this type can, for example, be designed in such a way that the outlet opening opening into the mixing tube is used for the delivery of prepolymer or similar resins and the outlet opening opening coaxially therewith is provided for the delivery of an activator.
  • the mouthpiece consists essentially of a mixing tube 1 and a tube piece 2.
  • the mouthpiece is connected to an extrusion device, the front part 3 of which is indicated by dash-dotted lines.
  • the front part 3 is indicated by a first outlet opening 3a (shown in the closed position) and a second outlet opening 3b upstream of this first outlet opening 3a coaxially in the squeezing direction.
  • the first outlet opening 3a opens into the squeezing tube 1 and the second outlet opening 3b opens into the pipe section 2.
  • the pipe section 2 is held and stabilized via ribs 4 in the mixing pipe 1. It is also shown how the pipe section 2 is provided with a bore 2a which tapers slightly in the pressing-out direction and which opens into radial passages 2b at its end pointing in the pressing-out direction. These passages 2b located in the mouth region of the pipe section 2 are surrounded by an elastic sheath 5. This elastic sleeve 5 is connected to the pipe section 2 at its end area facing the mouth of the mixing pipe 1, ie this end area is surrounded, for example, by projections 2c of the pipe section 2. The casing 5 can be clamped into the space formed by the projections 2c and, if necessary, additionally glued.
  • the envelope 5 is at its opposite end region radially expandable from the pressure of the component flowing through the pipe section 2, so that in this area the component emerging through the passages 2b can reach the mixing tube 1 after expansion of the casing 5 and mix there with the other component.
  • the end of the mixing tube 1 facing the dispenser can also be provided with one or more recesses distributed over the rear end face, for example in the form of notches 1a, so that 1 edges form on the rear end face of the mixing tube. These edges can be used to clean the respective area of the squeezing device by rotating the mixing tube 1 about its own axis so that residues of the individual components can be removed.
  • FIG. 2 shows a further mouthpiece with a mixing tube 6.
  • the mouthpiece with its mixing tube 6 is connected to an extrusion device, the front part 7 of which is indicated by a dot-dash line.
  • the front part 7 is indicated with a first outlet opening 7a and a second outlet opening 7b (shown in the open position), the first outlet opening 7a being arranged coaxially in the squeezing direction to the outlet opening 7b.
  • the first outlet opening 7a opens into a pipe section 8.
  • This pipe section 8 is provided with a bore 8a which tapers slightly in the direction of squeezing and which opens into radial passages 8b at its end pointing in the direction of squeezing.
  • These passages 8b located in the mouth region of the pipe section 8 are surrounded by an elastic sleeve 9.
  • the elastic sleeve can be radially deformed by the pressure of the component flowing through the bore 8a.
  • the pipe section 8 is held and stabilized by means of ribs 8c which are supported on the mixing pipe 6.
  • the pipe section 8 In the area pointing counter to the pressing direction, the pipe section 8 is surrounded by a bellows 10. This bellows 10 axially covers the outlet opening 7b. The bellows 10 is axially compressed by the pressure of the component flowing through the outlet opening 7b, so that the component can emerge and flow in the pressing direction along the annular space between bellows 10, pipe section 8 and mixing tube 6. In the area of the passages 8b, the individual components flowing out of the passage openings 7a, 7b mix.
  • Plastic is a suitable material for the mixing pipe 1, 6 and the pipe section 2, 8.
  • the sheath 5, 9 and the bellows 10 are also advantageously formed from plastic, but from a highly elastic one.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Coating Apparatus (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Nozzles (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Formation And Processing Of Food Products (AREA)

Abstract

For injection devices for two-component materials, a nozzle is provided within which the mixing of the individual components takes place. The nozzle has a mixing tube (1) for a first discharge opening (3a) and, arranged coaxially therewith, a tube piece (2) for a second discharge opening (3b) of the injection device. The pipe piece (2) is provided with a non-return valve which comprises passages (2b) of the pipe piece (2) and a sleeve (5) surrounding this region of the pipe piece (2). This non-return valve prevents a back-surge of the individual components and promotes the formation of a closure by a portion of cured components, so that even during actuation of the injection device with the nozzle, with cured components accumulated thereon, still mounted, no back-surge into the injection device occurs. <IMAGE>

Description

Die Erfindung betrifft ein Mundstück für Auspressgeräte, die dem Abgeben von Zweikomponenentenmassen dienen, mit einem Mischrohr, das zum Anschliessen an eine geräteseitige Abgabedüse mit zwei Austrittsöffnungen für die einzelnen Komponenten vorgesehen ist.The invention relates to a mouthpiece for dispensing devices which serve the dispensing of two-component masses, with a mixing tube which is provided for connection to a dispensing nozzle on the device with two outlet openings for the individual components.

Ein Auspressgerät für Zweikomponentenmassen ist beispielsweise aus der CH-PS 670 580 bekannt. Wie das Beispiel zeigt, weist ein solches Gerät üblicherweise eine Abgabedüse auf, die mit einer Austrittsöffnung je für eine Komponente versehen ist. Geräteintern sind die einzelnen Komponenten voneinander getrennt und treten durch die jeweiligen Austrittsöffnungen in ein Mundstück ein, welches an die geräteseitige Abgabedüse angeschlossen ist. Innerhalb des Mundstückes findet eine Vermischung der beiden Komponenten statt, welche für das schlussendliche Aushärten massgebend ist.An extrusion device for two-component compositions is known, for example, from CH-PS 670 580. As the example shows, such a device usually has a dispensing nozzle which is provided with an outlet opening for one component each. The individual components are separated from each other inside the device and enter a mouthpiece through the respective outlet openings, which is connected to the device-side dispensing nozzle. The two components are mixed within the mouthpiece, which is decisive for the final hardening.

Wird ein solch bekanntes Gerät während einiger Zeit nicht gebraucht, findet innerhalb des Mundstückes eine Aushärtung statt. Es ist somit erforderlich, ein solches, mit ausgehärteter Masse angefülltes Mundstück gegen ein neues auszutauschen, so dass der Auspressvorgang samt dem daran anschliessenden Mischvorgang innerhalb des neuen Mundstückes fortgesetzt werden kann.If such a known device is not used for some time, curing takes place within the mouthpiece. It is therefore necessary to exchange such a mouthpiece filled with hardened mass for a new one, so that the squeezing out process and the subsequent mixing process can be continued within the new mouthpiece.

Das Auspressen der einzelnen Komponenten erfolgt bei den bekannten Auspressgeräten durch Aufbringen eines bestimmten, im Gerät erzeugten Druckes. Ein solcher Druck kann manuell oder mit zusätzlich zugeführten Druckmedien aufgebracht werden. Wird ein solcher Druck aufgebracht, ohne dass - beispielsweise aus Versehen - ein Mundstück mit ausgehärteten Komponenten vorzeitig entfernt wird, besteht die Gefahr, dass eine der Komponenten durch die Austrittsöffnung der anderen Komponente in das Auspressgerät zurückschlägt. Dadurch kann innerhalb des Auspressgerätes eine Vermischung der Komponenten erfolgen, so dass beispielsweise im Bereich der Auspressmechanismen eine Aushärtung erfolgt, was zu Störungen des Auspressgerätes führen kann. Eine solche Störung ist nur durch zeitaufwendiges Demontieren und Reinigen des Auspressgerätes möglich. Das Zurückschlagen der Komponenten erfolgt dabei willkürlich, meistens in Abhängigkeit von den Viskositätsunterschieden und eventuellen Druckdifferenzen zwischen den einzelnen Komponenten.In the known extrusion devices, the individual components are pressed out by applying a certain pressure generated in the device. Such a print can be applied manually or with additionally supplied print media. If such pressure is applied without - For example, by mistake - a mouthpiece with hardened components is removed prematurely, there is a risk that one of the components will strike back through the outlet opening of the other component into the extrusion device. As a result, the components can be mixed within the extrusion device, so that curing takes place, for example, in the area of the extrusion mechanisms, which can lead to malfunctions in the extrusion device. Such a fault is only possible by time-consuming dismantling and cleaning of the dispenser. The components are kicked back arbitrarily, mostly depending on the viscosity differences and any pressure differences between the individual components.

Der Erfindung liegt die Aufgabe zugrunde, für ein Auspressgerät der vorgängig geschilderten Art ein Mundstück zu schaffen, mit welchem vermieden wird, dass es zu Störungen, hervorgerufen durch ein Zurückschlagen von Komponentenanteilen in das Auspressgerät, kommt.The invention has for its object to provide a mouthpiece for a squeezing device of the type described above, with which it is avoided that malfunctions caused by a kickback of component parts in the squeezing device occur.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass im Mischrohr wenigstens ein mit einer der Austrittsöffnungen zusammenwirkendes, den Durchtritt der jeweiligen Komponente erlaubendes Einwegventil vorgesehen ist.According to the invention the object is achieved in that at least one one-way valve cooperating with one of the outlet openings and allowing the passage of the respective component is provided in the mixing tube.

Das erfindungsgemässe Mundstück mit wenigstens einem Einwegventil, das mit einer der Austrittsöffnungen zusammenwirkt, hat zur Folge, dass wenigstens eine der beiden Komponenten zuerst das Einwegventil passieren muss und danach eine Vermischung mit der anderen sich im Mischrohr befindlichen Komponente erfolgt. Das Einwegventil öffnet nur so lange, wie die Komponente durchströmt. Sobald der Auspressdruck weggenommen wird, schliesst das Einwegventil, so dass kein weiterer Anteil der Komponente austreten kann und darüber hinaus vom Mischrohr aber auch kein Anteil der anderen Komponente zu der dem Einwegventil zugeordneten Austrittsöffnung gerät. Wird der Auspressvorgang eine gewisse Zeit unterbrochen, so dass im Mundstück eine Aushärtung der vermischten Komponenten stattfindet, hat dies zur Folge, dass an jener Stelle, wo die einzelnen Komponenten erstmals zusammenfliessen, das heisst im Bereich des Einwegventils, die Aushärtung zuerst vonstatten geht. Es kann sich damit, insbesondere um das geöffnete Einwegventil herum, ein Anteil an ausgehärteten Komponenten bilden, welcher dann zur Folge hat, dass das Mischrohr durch den Anteil der ausgehärteten Komponenten zum Gerät hin verschlossen ist. Wird versehentlich ein derartig mit einem Anteil an ausgehärteten Komponenten angefülltes Mundstück vor Aufbringen des Auspressdruckes nicht gewechselt, hat dies lediglich zur Folge, dass die einzelnen Komponenten innerhalb des Mundstückes separiert bis zu dem von dem Anteil an ausgehärteten Komponenten gebildeten Verschluss gelangen, dass aber aufgrund der Separierung keine der Komponenten in den Bereich der jeweils anderen gelangen kann, so dass damit ein Zurückschlagen in das Auspressgerät vermieden wird.The mouthpiece according to the invention with at least one one-way valve, which cooperates with one of the outlet openings, has the consequence that at least one of the two components must first pass through the one-way valve and then mixed with the other component in the mixing tube. The one-way valve only opens as long as the component flows through. As soon as the squeezing pressure is removed, the one-way valve closes, so that no further portion of the component can escape and, moreover, no portion of the other component comes from the mixing tube to the outlet opening assigned to the one-way valve. If the squeezing process is interrupted for a certain time, so that the mixed components harden in the mouthpiece, this results in that at the point where the individual components flow together for the first time, i.e. in the area of the one-way valve, the curing takes place first. A portion of cured components can thus form, in particular around the open one-way valve, which then has the consequence that the mixing tube is closed to the device by the portion of the cured components. If a mouthpiece filled with a proportion of hardened components is not inadvertently replaced before the pressing-out pressure is applied, the only result is that the individual components within the mouthpiece separate up to the closure formed by the proportion of hardened components, but because of the Separation, none of the components can get into the area of the other, so that a kick back into the pressing device is avoided.

Auch bei diesem erfindungsgemässen Mundstück handelt es sich um ein Wegwerfteil, welches nach Unterbrechung des Auspressvorganges vom Auspressgerät entfernt werden muss. Für die zufriedenstellende Funktion des weiteren Auspressvorganges ist es wie bis anhin erforderlich, die Abgabedüse des Auspressgerätes mit einem neuen Mundstück zu versehen.This mouthpiece according to the invention is also a disposable part, which has to be removed from the pressing device after the pressing process has been interrupted. For the satisfactory functioning of the further squeezing process, it is necessary as before to provide the dispensing nozzle of the squeezing device with a new mouthpiece.

Zweckmässigerweise ist ein Einwegventil im Abstand von der Anschlussstelle zu einer ersten Austrittsöffnung an einem im Mischrohr koaxial gelagerten, mit der entsprechenden Austrittsöffnung verbindbaren Rohrstück angeordnet. Dadurch wird erreicht, dass es zu einer Abtrennung der beiden geräteseitigen Austrittsöffnungen voneinander kommt, was insbesondere dann von Vorteil ist, wenn nur eine der Austrittsöffnungen mit einem Einwegventil zusammenwirkt. Erst nachdem die das Rohrstück durchsetzende Komponente auch das Einwegventil passiert hat, erfolgt eine Vermischung mit der anderen sich im Mischrohr befindlichen Komponente.A one-way valve is expediently arranged at a distance from the connection point to a first outlet opening on a pipe section which is mounted coaxially in the mixing tube and can be connected to the corresponding outlet opening. It is thereby achieved that the two outlet openings on the device side are separated from one another, which is particularly advantageous if only one of the outlet openings interacts with a one-way valve. Only after the component passing through the pipe section has also passed through the one-way valve is it mixed with the other component located in the mixing pipe.

Um eine ausreichende Vermischung der einzelnen Komponenten zu erzielen, ist vorzugsweise das Rohrstück koaxial innerhalb des Mischrohres angeordnet. Damit ist das Rohrstück für den Durchtritt der einen Komponente und der Ringraum zwischen Rohrstück und Mischrohr für den Durchtritt der anderen Komponente vorgesehen. Der Ringraum zwischen Rohrstück und Mundstück kann allenfalls von Rippen durchsetzt sein, welche einerseits der Stabilisierung des Rohrstückes dienen, andererseits aber genügend Freiräume für den Durchtritt der einen Komponente zwischen Rohrstück und Mischrohr erlauben.In order to achieve sufficient mixing of the individual components, the pipe section is preferably arranged coaxially within the mixing pipe. This is the pipe section for the passage of one component and the annular space between the tube piece and the mixing tube are provided for the passage of the other component. The annular space between the tube piece and the mouthpiece can at most be penetrated by ribs, which on the one hand serve to stabilize the tube piece, but on the other hand allow enough space for the passage of the one component between the tube piece and the mixing tube.

Als Einwegventil bieten sich beispielsweise eine oder mehrere von einem elastisch verformbaren Teil abdeckbare Öffnungen am Rohrstück an. Vorteilhafterweise handelt es sich bei diesen Öffnungen um radiale Durchtritte, welche im Mündungsbereich des Rohrstückes angeordnet sind. Als elastisch verformbares Teil für diese beispielsweise radial angeordneten Durchtritte eignet sich zweckmässigerweise eine elastische Hülle, welche die Öffnungen umgibt. Diese elastische Hülle hat vorzugsweise die Gestalt eines Schlauches.For example, one or more openings on the pipe section that can be covered by an elastically deformable part are suitable as one-way valves. These openings are advantageously radial passages which are arranged in the mouth region of the pipe section. An elastically deformable part for these, for example, radially arranged passages is expediently an elastic sheath which surrounds the openings. This elastic sleeve preferably has the shape of a tube.

Hinsichtlich einer einwandfreien Funktion des Einwegventils wirkt es sich vorteilhaft aus, wenn die elastische Hülle an ihrem zur Mündung des Mischrohres weisenden Endbereich mit dem Mündungsbereich des Rohrstückes verbunden ist und an ihrem gegenüberliegenden Endbereich vom Druck der durch das Rohrstück strömenden Komponente elastisch verformt werden kann. Es bildet sich damit für die das Rohrstück durchströmende Komponente quasi eine Umlenkschikane, welche sich einerseits vorteilhaft auf den Mischvorgang auswirkt und andererseits sich aber auch vorteilhaft auf den von einem Anteil an ausgehärteten Komponenten zu bildenden Verschluss auswirkt.With regard to the proper functioning of the one-way valve, it is advantageous if the elastic sleeve is connected at its end area facing the mouth of the mixing tube to the mouth area of the pipe section and can be elastically deformed at its opposite end area by the pressure of the component flowing through the pipe section. A quasi deflection baffle is thus formed for the component flowing through the pipe section, which on the one hand has an advantageous effect on the mixing process and on the other hand also has an advantageous effect on the closure to be formed by a proportion of hardened components.

An sich reicht es zur Lösung der vorstehend geschilderten Aufgabe aus, nur eine der Austrittsöffnungen mit einem Einwegventil zu versehen. Um im Hinblick auf die jeweilige Gestaltung des Auspressgerätes sowie auf die von den Anwendung findenden Komponenten gestellten Anforderungen eine weitere Ausführungsform zur Verfügung zu stellen, ist zweckmässsigerweise ein weiteres Einwegventil im Bereich der Anschlussstelle zu einer zweiten Austrittsöffnung angeordnet. Nachdem dieses weitere Einwegventil im Bereich der Anschlussstelle angeordnet ist, findet nach wie vor eine räumliche Trennung der Austrittstellen, d.h. im vorliegenden Fall der Einwegventile, statt. Somit ist nebst der durch die Anordnung der Einwegventile erzielten Wirkungsweise, eine unerwünschte Vermischung der einzelnen Komponenten schon aus räumlichen Gründen unterbunden.In itself, it is sufficient to solve the problem described above, to provide only one of the outlet openings with a one-way valve. In order to provide a further embodiment in view of the respective design of the squeezing device and the requirements placed on the components by the application, a further one-way valve is expediently arranged in the area of the connection point to a second outlet opening. After this further one-way valve is arranged in the area of the connection point, there is still a spatial separation of the outlet points, ie in the present case the one-way valves. Thus, in addition to the mode of operation achieved by the arrangement of the one-way valves, undesired mixing of the individual components is prevented for spatial reasons alone.

Vorzugsweise weist das weitere Einwegventil einen vom Druck der durch die zweite Austrittsöffnung strömenden Komponente axial stauchbaren Faltenbalg auf. Ein solcher Faltenbalg wirkt im Sinne eines elastisch verformbaren Teiles analog der Schilderung im Zusammenhang mit dem ersten Einwegventil, nur mit dem Unterschied, dass der elastische Faltenbalg axial und die elastische Hülle radial verformbar sind. Aufgrund der Eigenspannung deckt der Faltenbalg die zweite Austrittsöffnung ab, bis eine Stauchung durch den Druck der durch die Austrittsöffnung ausströmenden Komponente erfolgt.The further one-way valve preferably has a bellows that is axially compressible by the pressure of the component flowing through the second outlet opening. Such a bellows acts in the sense of an elastically deformable part analogous to the description in connection with the first one-way valve, only with the difference that the elastic bellows are axially deformable and the elastic sleeve is radially deformable. Due to the internal stress, the bellows covers the second outlet opening until compression occurs due to the pressure of the component flowing out through the outlet opening.

Mit Vorteil wird sowohl bei Anordnung nur eines Einwegventiles, als auch bei Anordnung zweier Einwegventile, das Mischrohr derart lang ausgebildet, dass das bzw. die Einwegventile ausreichend vom Mischrohr überstanden werden. Dadurch kommt eine ausreichend lange Mischungsstrecke zustande, welche Gewähr für eine ausreichende Durchmischung der einzelnen Komponenten bietet.With the arrangement of only one one-way valve as well as with the arrangement of two one-way valves, the mixing tube is advantageously made so long that the one-way valve or valves are sufficiently protruded from the mixing tube. This creates a sufficiently long mixing section, which guarantees sufficient mixing of the individual components.

Das erfindungsgemässe Mundstück findet vorteilhaft Anwendung im Zusammenhang mit einem Auspressgerät, das eine in das Mischrohr mündende erste Austrittsöffnung und zu dieser ersten Austrittsöffnung koaxial in Auspressrichtung vorgelagert eine in das Rohrstück mündende zweite Austrittsöffnung aufweist. Ein Gerät dieser Bauart kann beispielsweise so ausgelegt sein, dass die in das Mischrohr mündende Austrittsöffnung der Abgabe von Prepolymer oder ähnlicher Harze dient und die koaxial dazu angeordnete, in das Rohrstück mündende Austrittsöffnung für die Abgabe eines Aktivators vorgesehen ist.The mouthpiece according to the invention is advantageously used in connection with an extrusion device which has a first outlet opening opening into the mixing tube and, upstream of this first outlet opening, coaxially in front of this first outlet opening and a second outlet opening opening into the tube section. A device of this type can, for example, be designed in such a way that the outlet opening opening into the mixing tube is used for the delivery of prepolymer or similar resins and the outlet opening opening coaxially therewith is provided for the delivery of an activator.

Die Erfindung wird nachstehend, anhand der sie beispielsweise wiedergebenden Zeichnungen, näher erläutert. Es zeigen:

Fig. 1
ein Mundstück mit einem Einwegventil im Längsschnitt und schematisch angedeutetem Vorderteil eines Auspressgerätes;
Fig. 2
ein Mundstück mit zwei Einwegventilen im Längsschnitt und schematisch angedeutetem Vorderteil eines Auspressgerätes.
The invention is explained in more detail below with reference to the drawings, for example. Show it:
Fig. 1
a mouthpiece with a one-way valve in longitudinal section and schematically indicated front part of a dispenser;
Fig. 2
a mouthpiece with two one-way valves in longitudinal section and schematically indicated front part of a dispenser.

Wie Fig. 1 zeigt, besteht das Mundstück im wesentlichen aus einem Mischrohr 1 und einem Rohrstück 2. Angeschlossen ist das Mundstück an ein Auspressgerät, dessen Vorderteil 3 strichpunktiert angedeutet ist. Andeutungsweise ist dem Vorderteil 3 eine erste - in geschlossener Stellung dargestellte - Austrittsöffnung 3a und zu dieser ersten Austrittsöffnung 3a koaxial in Auspressrichtung vorgelagert eine zweite Austrittsöffnung 3b zugeordnet. Dabei mündet die erste Austrittsöffnung 3a in das Auspressrohr 1 und die zweite Austrittsöffnung 3b in das Rohrstück 2.As shown in FIG. 1, the mouthpiece consists essentially of a mixing tube 1 and a tube piece 2. The mouthpiece is connected to an extrusion device, the front part 3 of which is indicated by dash-dotted lines. The front part 3 is indicated by a first outlet opening 3a (shown in the closed position) and a second outlet opening 3b upstream of this first outlet opening 3a coaxially in the squeezing direction. The first outlet opening 3a opens into the squeezing tube 1 and the second outlet opening 3b opens into the pipe section 2.

Wie die Zeichnung ferner zeigt, ist das Rohrstück 2 über Rippen 4 im Mischrohr 1 gehaltert und stabilisiert. Ferner wird gezeigt, wie das Rohrstück 2 mit einer sich in Auspressrichtung leicht verjüngenden Bohrung 2a versehen ist, welche an ihrem in Auspressrichtung weisenden Ende in radiale Durchtritte 2b mündet. Diese sich im Mündungsbereich des Rohrstückes 2 befindlichen Durchtritte 2b sind von einer elastischen Hülle 5 umgeben. Diese elastische Hülle 5 ist an ihrem zur Mündung des Mischrohres 1 weisenden Endbereich mit dem Rohrstück 2 verbunden, dh dieser Endbereich ist beispielsweise von Vorsprüngen 2c des Rohrstückes 2 umstanden. In den von den Vorsprüngen 2c gebildeten Raum kann die Hülle 5 eingeklemmt und gegebenenfalls zusätzlich noch verklebt werden. An ihrem gegenüberliegenden Endbereich ist die Hülle 5 vom Druck der durch das Rohrstück 2 strömenden Kompcnente radial dehnbar, so dass in diesem Bereich die durch die Durchtritte 2b austretende Komponente nach Ausdehnung der Hülle 5 ins Mischrohr 1 gelangen kann und sich dort mit der anderen Komponente vermischt. Das dem Auspressgerät zugewandte Ende des Mischrohres 1, kann zudem mit einer oder mehreren über die rückwärtige Stirnseite verteilten Ausnehmungen, beispielsweise in Form von Kerben 1a, versehen sein, so dass sich an der rückwärtigen Stirnseite des Mischrohres 1 Kanten bilden. Diese Kanten können zum Reinigen des jeweiligen Bereiches des Auspressgerätes herangezogen werden, indem das Mischrohr 1 um seine eigene Achse gedreht wird, um so Reste der einzelnen Komponenten entfernen zu können.As the drawing also shows, the pipe section 2 is held and stabilized via ribs 4 in the mixing pipe 1. It is also shown how the pipe section 2 is provided with a bore 2a which tapers slightly in the pressing-out direction and which opens into radial passages 2b at its end pointing in the pressing-out direction. These passages 2b located in the mouth region of the pipe section 2 are surrounded by an elastic sheath 5. This elastic sleeve 5 is connected to the pipe section 2 at its end area facing the mouth of the mixing pipe 1, ie this end area is surrounded, for example, by projections 2c of the pipe section 2. The casing 5 can be clamped into the space formed by the projections 2c and, if necessary, additionally glued. The envelope 5 is at its opposite end region radially expandable from the pressure of the component flowing through the pipe section 2, so that in this area the component emerging through the passages 2b can reach the mixing tube 1 after expansion of the casing 5 and mix there with the other component. The end of the mixing tube 1 facing the dispenser can also be provided with one or more recesses distributed over the rear end face, for example in the form of notches 1a, so that 1 edges form on the rear end face of the mixing tube. These edges can be used to clean the respective area of the squeezing device by rotating the mixing tube 1 about its own axis so that residues of the individual components can be removed.

Fig. 2 zeigt ein weiteres Mundstück mit einem Mischrohr 6. Das Mundstück mit seinem Mischrohr 6 ist an einem Auspressgerät, dessen Vorderteil 7 strichpunktartig angedeutet ist, angeschlossen. Andeutungsweise ist das Vorderteil 7 mit einer ersten Austrittsöffnung 7a und einer zweiten - in geöffneter Stellung dargestellten - Austrittsöffnung 7b versehen, wobei die erste Austrittsöffnung 7a koaxial in Auspressrichtung zur Austrittsöffnung 7b vorgelagert ist.FIG. 2 shows a further mouthpiece with a mixing tube 6. The mouthpiece with its mixing tube 6 is connected to an extrusion device, the front part 7 of which is indicated by a dot-dash line. The front part 7 is indicated with a first outlet opening 7a and a second outlet opening 7b (shown in the open position), the first outlet opening 7a being arranged coaxially in the squeezing direction to the outlet opening 7b.

Wie die Fig. 2 ferner zeigt, mündet die erste Austrittsöffnung 7a in ein Rohrstück 8. Dieses Rohrstück 8 ist mit einer sich in Auspressichtung leicht verjüngenden Bohrung 8a versehen, welche an ihrem in Auspressrichtung weisenden Ende in radiale Durchtritte 8b mündet. Diese sich im Mündungsbereich des Rohrstückes 8 befindlichen Durchtritte 8b sind von einer elastischen Hülle 9 umgeben. Im Bereich der Durchtritte 8b ist die elastische Hülle vom Druck der durch die Bohrung 8a strömenden Komponente radial verformbar. Gehaltert und stabilisiert ist das Rohrstück 8 über Rippen 8c, welche sich am Mischrohr 6 abstützen.As FIG. 2 also shows, the first outlet opening 7a opens into a pipe section 8. This pipe section 8 is provided with a bore 8a which tapers slightly in the direction of squeezing and which opens into radial passages 8b at its end pointing in the direction of squeezing. These passages 8b located in the mouth region of the pipe section 8 are surrounded by an elastic sleeve 9. In the area of the passages 8b, the elastic sleeve can be radially deformed by the pressure of the component flowing through the bore 8a. The pipe section 8 is held and stabilized by means of ribs 8c which are supported on the mixing pipe 6.

In dem entgegen der Auspressrichtung weisenden Bereich ist das Rohrstück 8 von einem Faltenbalg 10 umgeben. Dieser Faltenbalg 10 deckt axial die Austrittsöffnung 7b ab. Vom Druck der durch die Austrittsöffnung 7b strömenden Komponente wird der Faltenbalg 10 axial gestaucht, so dass die Komponente austreten und in Auspressrichtung entlang des Ringraumes zwischen Faltenbalg 10, Rohrstück 8 und Mischrohr 6 strömen kann. Im Bereich der Durchtritte 8b vermischen sich die einzelnen aus den Durchtrittsöffnungen 7a, 7b strömenden Komponenten.In the area pointing counter to the pressing direction, the pipe section 8 is surrounded by a bellows 10. This bellows 10 axially covers the outlet opening 7b. The bellows 10 is axially compressed by the pressure of the component flowing through the outlet opening 7b, so that the component can emerge and flow in the pressing direction along the annular space between bellows 10, pipe section 8 and mixing tube 6. In the area of the passages 8b, the individual components flowing out of the passage openings 7a, 7b mix.

Für das Mischrohr 1, 6 sowie das Rohrstück 2, 8 bietet sich als Material Kunststoff an. Ebenfalls aus Kunststoff, aber aus stark elastischem, ist mit Vorteil die Hülle 5, 9 sowie der Faltenbalg 10 gebildet.Plastic is a suitable material for the mixing pipe 1, 6 and the pipe section 2, 8. The sheath 5, 9 and the bellows 10 are also advantageously formed from plastic, but from a highly elastic one.

Claims (10)

Mundstück für Auspressgeräte, die dem Abgeben von Zweikomponentenmassen dienen, mit einem Mischrohr (1, 6), das zum Anschliessen an eine geräteseitige Abgabedüse mit zwei Austrittsöffnungen (3a, 3b, 7a, 7b) für die einzelnen Komponenten vorgesehen ist, dadurch gekennzeichnet, dass im Mischrohr (1, 6) wenigstens ein mit der einen Austrittsöffnung (3b, 7a) zusammenwirkendes, den Durchtritt der jeweiligen Komponente erlaubendes Einwegventil vorgesehen ist.Mouthpiece for dispensing devices which serve the dispensing of two-component masses, with a mixing tube (1, 6), which is provided for connection to a dispensing nozzle on the device side with two outlet openings (3a, 3b, 7a, 7b) for the individual components, characterized in that At least one one-way valve which interacts with the one outlet opening (3b, 7a) and permits the passage of the respective component is provided in the mixing tube (1, 6). Mundstück nach Anspruch 1, dadurch gekennzeichnet, dass ein Einwegventil im Abstand von der Anschlussstelle zu einer ersten Austrittsöffnung (3a, 7b) an einem im Mischrohr (1,6) koaxial gelagerten, mit der entsprechenden Austrittsöffnung (3b, 7a) verbindbaren Rohrstück (2, 8) angeordnet ist.Mouthpiece according to claim 1, characterized in that a one-way valve at a distance from the connection point to a first outlet opening (3a, 7b) on a pipe section (2) which is mounted coaxially in the mixing tube (1,6) and can be connected to the corresponding outlet opening (3b, 7a) , 8) is arranged. Mundstück nach Anspruch 2, dadurch gekennzeichnet, dass das Einwegventil eine oder mehrere von einem elastisch verformbaren Teil abdeckbare Öffnungen aufweist.Mouthpiece according to claim 2, characterized in that the one-way valve has one or more openings which can be covered by an elastically deformable part. Mundstück nach Anspruch 3, dadurch gekennzeichnet, dass die Öffnungen als radiale Durchtritte (2b, 8b) im Mündungsbereich des Rohrstücks (2, 8) ausgebildet sind.Mouthpiece according to claim 3, characterized in that the openings are designed as radial passages (2b, 8b) in the mouth region of the pipe section (2, 8). Mundstück nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass das elastisch verformbare Teil von einer die Öffnungen umgebenden elastischen Hülle (5, 9) gebildet ist.Mouthpiece according to claim 3 or 4, characterized in that the elastically deformable part is formed by an elastic sleeve (5, 9) surrounding the openings. Mundstück nach Anspruch 5, dadurch gekennzeichnet, dass die elastische Hülle (5) an ihrem zur Mündung des Mischrohres (1) weisenden Endbereich mit dem Mündungsbereich des Rohrstücks (2) verbunden und an ihrem gegenüberliegenden Endbereich vom Druck der durch das Rohrstück (2) strömenden Komponente elastisch verformbar ist.Mouthpiece according to claim 5, characterized in that the elastic sleeve (5) is connected at its end region facing the mouth of the mixing tube (1) to the mouth region of the tube section (2) and at its opposite end region by the pressure of the flow through the tube section (2) Component is elastically deformable. Mundstück nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass ein weiteres Einwegventil im Bereich der Anschlussstelle zu einer zweiten Austrittsöffnung (7b) angeordnet ist.Mouthpiece according to one of claims 1 to 6, characterized in that a further one-way valve is arranged in the region of the connection point to a second outlet opening (7b). Mundstück nach Anspruch 7, dadurch gekennzeichnet, dass das weitere Einwegventil einen vom Druck der durch die zweite Austrittsöffnung (7b) strömenden Komponente axial stauchbaren Faltenbalg (10) aufweist.Mouthpiece according to claim 7, characterized in that the further one-way valve has a bellows (10) axially compressible by the pressure of the component flowing through the second outlet opening (7b). Mundstück nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Einwegventile axial in Auspressrichtung von der Mündung des Mischrohres (1) überstanden werden.Mouthpiece according to one of claims 1 to 8, characterized in that the one-way valves project axially from the mouth of the mixing tube (1) in the squeezing direction. Verwendung eines Mundstückes nach einem der Ansprüche 1 bis 9 mit einem Auspressgerät, das eine in das Rohrstück mündende erste Austrittsöffnung (3a, 7b) und zu dieser ersten Austrittsöffnung (3a, 7b) koaxial in Auspressrichtung vorgelagert eine in das Rohrstück (2, 8) mündende zweite Austrittsöffnung (3b, 7a) aufweist.Use of a mouthpiece according to one of claims 1 to 9 with a squeezing device which has a first outlet opening (3a, 7b) opening into the pipe section and upstream of this first outlet opening (3a, 7b) coaxially in the squeezing direction, one into the pipe section (2, 8) has opening second outlet opening (3b, 7a).
EP93810389A 1992-07-24 1993-05-28 Mouthpiece for squeezing out devices for two component masses Expired - Lifetime EP0580547B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4224497A DE4224497A1 (en) 1992-07-24 1992-07-24 Mouthpiece for dispensing devices that are used to dispense two-component materials
DE4224497 1992-07-24

Publications (2)

Publication Number Publication Date
EP0580547A1 true EP0580547A1 (en) 1994-01-26
EP0580547B1 EP0580547B1 (en) 1996-06-19

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EP93810389A Expired - Lifetime EP0580547B1 (en) 1992-07-24 1993-05-28 Mouthpiece for squeezing out devices for two component masses

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US (1) US5429277A (en)
EP (1) EP0580547B1 (en)
JP (1) JPH06154685A (en)
AT (1) ATE139462T1 (en)
CA (1) CA2101149C (en)
DE (2) DE4224497A1 (en)
DK (1) DK0580547T3 (en)
ES (1) ES2088259T3 (en)

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EP0882495A1 (en) * 1997-06-06 1998-12-09 Valsave Engineering Services Ltd. Fluid mixing

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EP2258468B1 (en) * 2009-06-05 2012-05-16 Ritter GmbH Mixing system for dual component cartridges
EP2563524B1 (en) * 2010-04-28 2020-10-07 IPS Adhesives LLC Apparatus for mixing and dispensing multiple flowable components
DE102011076443B4 (en) 2011-05-25 2013-01-17 Lechler Gmbh Check valve for spray nozzle and nozzle tube
EP3023204A1 (en) * 2014-11-21 2016-05-25 HILTI Aktiengesellschaft Handheld tool gear closure and handheld machine tool
KR102518487B1 (en) * 2017-05-25 2023-04-05 지씨피 어플라이드 테크놀로지스 인크. Expansion nozzle for component addition to concrete trucks and method and system for its use
DE102020103073B4 (en) 2020-02-06 2021-12-30 Frank Wolff Mixing device for two-component adhesives
DE102023100410A1 (en) 2023-01-10 2024-07-11 Daw Se Device for improving the stability of an existing thermal insulation system

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Also Published As

Publication number Publication date
CA2101149C (en) 2000-10-10
DE59302992D1 (en) 1996-07-25
CA2101149A1 (en) 1994-01-25
DE4224497A1 (en) 1994-01-27
DK0580547T3 (en) 1996-11-04
US5429277A (en) 1995-07-04
ATE139462T1 (en) 1996-07-15
EP0580547B1 (en) 1996-06-19
ES2088259T3 (en) 1996-08-01
JPH06154685A (en) 1994-06-03

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