EP0478944B1 - Device for proportioning and mixing two fluid components - Google Patents

Device for proportioning and mixing two fluid components Download PDF

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Publication number
EP0478944B1
EP0478944B1 EP91114189A EP91114189A EP0478944B1 EP 0478944 B1 EP0478944 B1 EP 0478944B1 EP 91114189 A EP91114189 A EP 91114189A EP 91114189 A EP91114189 A EP 91114189A EP 0478944 B1 EP0478944 B1 EP 0478944B1
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EP
European Patent Office
Prior art keywords
metering
metering pump
valve
stroke
pump
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.)
Expired - Lifetime
Application number
EP91114189A
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German (de)
French (fr)
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EP0478944A1 (en
Inventor
Otto Schiemann
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Mgv-Moest-Spritzgerate Produktions- und Vertriebs-Gmbh
Original Assignee
Mgv-Moest-Spritzgerate Produktions- und Vertriebs-Gmbh
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Priority claimed from DE4031649A external-priority patent/DE4031649C2/en
Priority claimed from DE9107818U external-priority patent/DE9107818U1/de
Application filed by Mgv-Moest-Spritzgerate Produktions- und Vertriebs-Gmbh filed Critical Mgv-Moest-Spritzgerate Produktions- und Vertriebs-Gmbh
Publication of EP0478944A1 publication Critical patent/EP0478944A1/en
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Publication of EP0478944B1 publication Critical patent/EP0478944B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/882—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances
    • B01F35/8822—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances using measuring chambers of the piston or plunger type

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • the required operating pressure of the individual components is measured and displayed by pressure gauges and monitored by contact pressure gauges or material pressure switches, which switch the system used for dosing and mixing to malfunction if a single component fails or the operating pressure drops.
  • Proper functioning of the conveying and dosing of each component can also be monitored and displayed directly on the dosing pumps used for dosing. With flow measuring cells, for example, the material flows flowing through a metering pump can be monitored and regulated, for example, to compensate for leaks.
  • the invention has for its object to improve the known device so that a very precise and variable dosage and mixing of two or more liquid components, in particular also chemically reacting components is possible in a very reliable manner.
  • the pumping process in the main pump provided for metering the first component is used directly for mixing the individual components, and in the simplest case no additional mixer is required. If the components solidify during the chemical reaction that occurs, for example when adding a hardener to a basic component, as is often the case with paints and varnishes If this is the case, it is of course assumed that the chemical reaction time is at least somewhat longer than a double stroke of the main pump including the subsequent processing time by an application device, for example a spray gun or the like. In most cases the reaction time will be considerably longer anyway.
  • the method carried out with the device according to the invention contradicts any origin, since it has hitherto been carefully avoided to mix several components which react chemically with one another, in particular solidifying or hardening, before the main component is drawn into the main pump. With this method, it is accepted that the components which react with one another may contaminate and solidify the pump if this is not prevented by pumping new material within the processing time or by thorough cleaning at certain intervals or in any case after the end of operation. This relatively minor disadvantage, however, bears no relation to the simplification of such a mixing plant and the savings in its manufacture.
  • the main metering pump creates a thorough mixing of the components, resulting in flows and eddies which are further increased when the material is pressed through the always provided high pressure filter and the connected delivery line.
  • the second and possibly further components are added to the first component during the intake of a metered volume defined by a double stroke of the main pump.
  • a desired dosage ratio To achieve between the components, calculations must be made before the start of operation and the metering strokes of the metering pumps for the second and further components must be set so that the metered volumes of the second and further components together with the metered volume of the first component each represent the volume of a double stroke of the main metering pump for the first component. This has the great advantage that the stroke of the main pump can always remain the same and therefore no longer requires any facilities for adjusting the stroke.
  • the metering pumps for the second and possibly further components can in principle have a constant stroke and have no adjustment devices if the same metering amounts are always to be metered in with a specific device. In this case, of course, a single metering pump could of course be changed at any time by certain modifications or replacements.
  • a pre-mixer can be connected upstream, and in extreme cases further mixers of various types can be connected upstream or downstream depending on the requirements of the main pump.
  • the metering valves flow flush into the suction path of the main component, which on the one hand ensures exact adherence to the metered quantities during metering and on the other hand prevents parts of the main component from penetrating into the delivery lines for the metered components and thus contamination occurring, which is a subsequent cleaning required.
  • the stroke volume of the metering pumps for the metered components can be adjustable, whereby a change in the metering ratios is very simplified.
  • the feed lines leading to the suction side of the main pump for the components to be mixed must have a metering valve which is controlled so that the respective component during the filling stroke of the Main pump is fed.
  • the metering pumps for the second and other components are therefore dependent on the pump rhythm of the main pump and each wait until the next filling stroke of the main pump begins.
  • the respective metering valve opens simultaneously with the start of the filling stroke and is only open during the filling stroke.
  • an embodiment according to claim 6 is very expedient in which the stroke adjustment of the individual metering pumps can be carried out in the simplest way.
  • a material pressure switch can be provided according to claim 7, which is also controlled by the pneumatic sequential circuit.
  • the material pressure switch When the material pressure switch is in the waiting position until the next double stroke of the main pump, an excess pressure is created in the associated metering pump. This is recognized by the material pressure switch. If the respective metering pump is operating correctly, the material pressure switch does not emit a signal. In the event of poor operation, however, it gives a signal to the pneumatic control, which triggers an alarm or shutdown device. The signal can also be given to an electrical documentation device, for example a line recorder.
  • a e.g. manually switchable changeover valve with multiple positions and paths can be provided.
  • the number of positions and paths exceeds the number of components by 1.
  • a device for two components requires a 3/3-way valve to control each of the two components individually and to control the mixing of the two in the third position Components.
  • Individual switches can of course also be provided in principle, but the use of such a changeover valve considerably simplifies the device.
  • the components can be liquefied by material heating, so that there is no impairment of the conveying and metering of the highly viscous components, which would lead to a malfunction of the entire device.
  • the first metering pump 10 for a first component (not shown) arranged in a storage container 12 and a smaller second metering pump 14 for a second component (not shown) arranged in a storage container 16 are provided.
  • the first component can be, for example, a lacquer-like base material and the second component can be a hardening material.
  • Both metering pumps 10 and 14 are designed as double-acting differential piston pumps, each of which is driven by a double-acting pneumatic drive cylinder 17 or 18.
  • the first metering pump 10 is preceded by a static premixer 20 and a prescreen 22.
  • the first component is sucked out of the reservoir 12 via a suction pipe 24.
  • the second metering pump 14 is preceded by a prescreen 26, which is connected to an intake pipe 28 immersed in the second component in the reservoir 16.
  • a high-pressure filter 30 with strainer insert 32 is connected to the pressure side of the first metering pump 10 and is connected to the reservoir 12 via a relief valve 34 and a relief line 36.
  • the high-pressure filter 30 is connected via a further static mixer 38 and an application line 40 to an application device designed as a spray gun 42.
  • the pressure side of the second metering pump 14 is in turn connected to the storage container 16 via a relief valve 44 and a relief line 46.
  • a delivery line 48 is connected to the pressure side of the second metering pump 14 and leads into a metering valve 50 opens, which in turn opens flush with the valve seat 52 in the premixer 20.
  • Both metering pumps 10 and 14 have a fixed, not easily adjustable metering volume. This is chosen so that the total volume sucked in during the suction stroke of the first metering pump 10 is equal to the sum of the metered volume of the first component sucked in from the reservoir 12 during this suction stroke and that fed into the mixer 20 through the metering valve 50 during the same suction stroke and one suction stroke the metering pump 14 corresponds to the corresponding metering volume of the second component.
  • the dosage ratio of the two components is precisely defined. This embodiment is therefore particularly suitable for applications in which the same material is always to be applied. If the dosing ratio is nevertheless to be changed exceptionally, the second dosing pump 14 can be set to the required dosing volume by relatively rapid conversion.
  • the relief valves 34 and 44 are opened so that the components sucked in through the suction pipes 24 and 28 can flow back into the reservoir 12 and 16 via the metering pumps 10 and 14 and the relief lines 36 and 46, respectively.
  • the metering valve 50 remains closed. This will fill the suction systems and the metering pumps.
  • the relief valves 34 and 44 are then closed again.
  • a function check of both metering pumps can be carried out separately when the relief valves 34, 44 are open and under operating conditions together when the valves are closed
  • Relief taps 34 and 44 on the spray gun 42 are each made by means of a measuring orifice 130 and a measuring cup 54 or the like, which is indicated by the position of the application line 40 shown in broken lines.
  • the delivery line 48 is filled with the second component up to the valve seat.
  • the components premixed in the premixer 20 and when flowing through the first metering pump 10 are mixed further in the downstream static mixer 38 and then fed through the application line 40 designed as a high-pressure hose to the spray gun 42 and sprayed by the same.
  • the metering valve 50 is controlled by the pneumatic control so that it opens at the start of the suction stroke of the first metering pump 10.
  • the suction stroke of the second metering pump 14 begins, so that the exact metering volume of the second metering pump 14 is fed into the mixer 20 while the first component is being sucked out of the storage container 12.
  • the metering valve 50 then closes at the latest at the end of the suction stroke of the first metering pump 10, so that precisely metered volumes of the first and second components are mixed and conveyed by the metering pump 10 into the mixer 38 and the application line 40. Since the valve seat 52 of the metering valve 50 lies flush in the wall of the premixer 20, there is no dead space and therefore no falsification of the metered volumes.
  • the suction pipe 24 is immersed in a detergent supply (not shown) which, in a manner known per se, comprises all parts of the device wetted by the mixed components, in particular the first metering pump 10, the high-pressure filter 30, the mixer 38, the application line 40 and the spray gun 42, which is cleaned thoroughly.
  • the metering valve 50 remains in turn during the cleaning process closed. If necessary, the remaining parts of the device can also be cleaned of the various components.
  • the second embodiment shown in FIG. 2 differs from the embodiment according to FIG. 1 in that a very simple adjusting device is provided for the metering stroke of the second metering pump 14. This allows the dosage ratio of the two components to be changed in a very simple manner.
  • the double-acting pneumatic drive cylinder 18 of the second metering pump 14 has a piston rod 56 guided in the free stroke, which is moved back and forth in the direction of the double arrow 58.
  • the metering pump 14 and the drive cylinder 18 are each firmly connected to a flange plate 60 or 62, which are held at a fixed mutual distance by axially extending rods 64, 66.
  • Roller valves 68 and 70 are each axially adjustably mounted on the rod 66 and can be fixed in any axial positions along the rod 66. Furthermore, the piston rod 56 carries an actuating block 72 which moves back and forth with the piston rod 56 and alternately actuates the roller valve 68 serving as the upper stroke limiter and the roller valve 70 serving as the lower stroke limiter.
  • the roller valves 68, 70 are set according to a predetermined, corresponding to the desired dosage ratio of the second metering pump 14 along the rod 66 and are connected in a suitable manner to the pneumatic control of the device, not shown, which in turn drives the drive cylinders 17, 18 according to the set lifting height controls. The two liquid components are therefore metered and conveyed in the correct metering ratio by the metering pumps 10 and 14.
  • the third embodiment of the invention shown in FIG. 3 The device is particularly suitable for a highly viscous first component.
  • a dynamic premixer 74 is provided, the piston rod 76 of which is moved back and forth by a pneumatic drive motor 78 connected to the pneumatic control in accordance with the double arrow 80 and for swirling and mixing those fed into the premixer 74
  • Components carries a series of suitably shaped plungers 82.
  • the upper end of the dynamic premixer 74 is connected to the inlet of the first metering pump 10 via a connecting line 84.
  • the premixer 74 is sealed by a high-pressure packing 266, so that the mixed material can only flow in via the connecting line 84 of the first metering pump.
  • the lower end of the premixer 74 is connected to a 3/3 way valve 86.
  • the 3/3-way valve 86 releases the suction of the first component from the storage container 12 via a heating device, generally designated 88, and a connecting line 90.
  • the valve 86 blocks all passageways and in its third position it opens the passageway from a supply of cleaning agent 92 via a cleaning agent pipe 94 to the premixer 74.
  • the valve 86 is in the latter position, one can turn on in a manner not shown open a valve 94 connected to a compressed air source and introduce compressed air into the pressure vessel 96 containing the cleaning agent 92 via a line 98 introduced into a closed pressure vessel 96.
  • a mixture of cleaning agent and compressed air enters the cleaning agent line 94 and, via this, into all parts of the device containing a mixture of the two components, which are thereby cleaned particularly well, as was described with reference to FIG. 1.
  • the highly viscous material 100 is sucked out of the storage container 12 into the premixer 74 via the heating device 88.
  • An intake pipe 110 with angled end 112 dips into the highly viscous material 100.
  • a flexible suction hose 114 is pulled onto the end 112 in a liquid-tight manner.
  • the opposite end 116 of the suction hose 114 is connected to the connecting line 90 by means of a screw coupling 118.
  • the intake pipe 110 is surrounded at a coaxial distance by an overtube 144, the space created between the intake pipe 110 and the overtube 144 being sealed in a liquid-tight manner by radial walls 146 and 148, respectively.
  • This intermediate space is filled with heat-conducting material 150, in which a heating element 152, which forms a heating element and is spirally wound around the suction pipe 110 in contact with the latter and is self-regulating and explosion-proof, is embedded.
  • a heating element 152 which forms a heating element and is spirally wound around the suction pipe 110 in contact with the latter and is self-regulating and explosion-proof.
  • the heating tape 152 embedded in the heat-conducting material 150 merges into extensions 154, 156 of identical or similar design, which are held in contact with the outside of the suction hose 114 by clips 158 and are embedded in a thermal insulation 160 comprising the suction hose 114.
  • the continuation 154 ends in an end termination 161 embedded in the thermal insulation 160.
  • the continuation 156 of the heating tape 152 is connected at its end 162 to an electrical connection box 164 which can be connected via an electrical cable 166 with a plug 168 to a power source (not shown).
  • the overtube 144 is at least in its section immersed in the material 100 surrounded by a protective tube 170 made of heat-insulating plastic at a coaxial distance, which is supported and held on the overtube 144 by means of webs 172.
  • the webs 172 are detachably supported on the overtube 144 so that the protective tube 170 can be removed for cleaning purposes.
  • the lower end of the protective tube 170 is at rest on the bottom of the reservoir 12, while the lower end 140 of the suction pipe 110 is held a short distance above the bottom. Near its rear end, the protective tube 170 has a ring of inlet openings 174 for the material 100 forming the first component.
  • the protective tube 170 largely prevents the heating energy of the heating tape 152 from escaping into the material 100 located outside the protective tube 170.
  • the total volume formed within the protective tube 170, the suction tube 110 and the suction hose 114 is now e.g. chosen so that at least one minute of heating time is available for heating the material in this total volume during normal operation of the spray gun 42 with the respectively selected width of the screwed-on spray nozzle.
  • this prevents energy wastage in the area of the material 100 located outside the protective tube 170 and, on the other hand, ensures a uniform suction and supply of the material into the first metering pump 10 through sufficient heating and thereby liquefaction of the material.
  • a material pressure switch 176 is switched on in the delivery line 48, which consists of a material space 178 filled by the second component and a compressed air space 182 separated from it by a membrane 180.
  • the diaphragm 180 moves in the direction of the material space 178 or compressed air space 182.
  • This movement of the diaphragm 180 moves a plunger 184 which switches a 3/2-way valve 186, via which a device indicating this material deficiency occurs when there is a lack of material is operated.
  • FIG. 4 shows a pneumatic circuit diagram for the embodiment shown in FIG. 3, which, however, is also valid for the other embodiments after an analog adjustment.
  • a main source of compressed air is connected to a main air port 188.
  • the compressed air supplied is then passed through a water separator 190 and cleaned.
  • the line 192 connected to the water separator 190 is connected via two branch lines 194 and 196 to a 3/3-way valve 198 which is designed as a 5/3-way valve and which can be switched into three positions, to the position 201 in which it is Main air supplies only the first metering pump 10 and the associated parts of the device, in the position 202, in which it supplies the main air only to the second metering pump 14 and the connected parts, and in the central position 203, in which it controls the operation of both metering pumps .
  • the operating pressure of the device which is displayed on the operating pressure indicator 206, is regulated via a compressed air regulator 204 connected to the line 192.
  • a 5/2 reversing valve 210 for the drive cylinder 78 is actuated via a line 208 connected to the pressure regulator 204.
  • the compressed air controlled by the 3/3-way valve 198 is passed through a compressed air regulator 212 and the pressure is displayed on the operating pressure indicator 214.
  • a 5/2 reversing valve 218 for the drive cylinder 17 is controlled via a line 216.
  • the reversing valve 218 controls the reciprocation of the drive cylinder 17 for the first metering pump 10.
  • the strokes of the working cylinder 17 are sensed by a 3/3-way valve 222 connected via the line 220, which control impulses via a line 224 to the pneumatic control 226 the device there.
  • the second metering pump 14 is controlled by a compressed air regulator 228 with an operating pressure indicator 230, the compressed air regulator 228 being connected via a pressure line 232 to a 5/3-way valve 234 which is connected to the pneumatic sequence control 226 via lines 236 and 252.
  • the 5/3-way valve 234 allows the main air to flow into the working cylinder 18 of the second metering pump 14.
  • the lifting height of the drive cylinder 18 and thus the first metering pump 14 is controlled in the manner described above by means of the adjustable roller valves 68 and 70 and the actuation block 72.
  • the second component flowing from the reservoir 16 of the second metering pump 14 flows after leaving the metering pump 14 via the pressure line 238 into the material pressure switch 176 and from there to the metering valve 50.
  • the operating pressures change the position of the membrane 180 in the material pressure switch 176 so that the membrane position is sensed
  • Tappet 184 can recognize the respective operating state and passes this on to the pneumatic control 226 via the 3/2-way valve 186 and a connected line 242.
  • the operating form is regulated by the pneumatic control 226 and supplied to the material pressure switch 176 via a pressure line 244.
  • a start button 246 is actuated, as a result of which the connected start valve 248 controls the controller 226 via a line 250.
  • Display devices 254 and 268 connected to the control 226 each show the end of the metering stroke of the working cylinder 17 and 18, respectively.
  • a 5/2 signal valve 258 is connected to the controller 226 via a further line 256. If there is a shortage of material, a visual display device 260 and / or an acoustic display device 262 can be triggered via the position of this signal valve 258.
  • the material pressure switch 176 controls the operating pressure at the metering valve 50, which is connected to the sequence control 226 via a compressed air line 264.
  • the sequential control 226 controls the metering valve 50 such that it only opens during the filling stroke of the first metering pump 10 and allows the material conveyed and metered by the second metering pump 14 to flow into the premixer 74. Since viscous material is conveyed in this embodiment, the two components are premixed in the dynamic premixer 74.
  • the start button 246 actuates the start valve 248 and is connected to the pneumatic control 226, so that the drive cylinders 17 and 18 start their operation at the same time.
  • the control strokes 226 recognize the metering strokes of the two metering pumps 10 and 14 and control them such that the metering valve 50 is opened simultaneously with the filling stroke of the first metering pump 10.
  • the second component flows through the metering valve 50 in a metering volume determined by a double stroke of the second metering pump 14. This is recognized by the pneumatic control 226. After the predetermined metering volume of the second component has left the metering valve 50, it closes and the second metering pump 14 stops, which is indicated by the display device 254 for the metering stroke end.
  • the controller 226 also recognizes the position of the 3/2-way valve 222, which is indicated on the display device 268 for the end of the metering stroke of the working cylinder 17. Then a simultaneous start of the next stroke of the two drive cylinders 17 and 18 is triggered by the control 226.
  • the controller 226 is designed so that it first controls the 5/3-way valve 234 of the working cylinder 18 into the blocking central position when the stroke end of the working cylinder 17 is not yet displayed.
  • the 5/3-way valve 234 remains in the middle blocking position until the working cylinder 17 also indicates its end of stroke. Only then does the 3/2-way valve 222 control and the 5/3-way valve 234 is reversed so that the working cylinders 17 and 18 begin their opposite stroke.
  • the corresponding control sequence takes place at the opposite stroke end, so that the subsequent stroke of both working cylinders 17 and 18 is started simultaneously.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Accessories For Mixers (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Reciprocating Pumps (AREA)

Abstract

Method of proportioning and mixing two fluid components chemically reacting with one another, a proportioned volume of the second component (16) being added to a proportioned volume of the first component (12) before entering the proportioning pump (10) proportioning the first component, as well as a device for carrying out the method. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a device according to the preamble of claim 1.

In Patent Abstract of Japan, Vol. 5, No. 32 (C-45)(703), 25. Februar 1981, ist eine derartige Vorrichtung zum Dosieren und Mischen von zwei chemisch nicht miteinander reagierenden Flüssigkeiten beschrieben. Die bekannte Vorrichtung arbeitet nicht sehr zuverlässig und dosiert die beiden Komponenten verhältnismäßig ungenau. Eine Veränderung des Dosierungsverhältnisses der beiden Komponenten ist nicht möglich. Auch ist die bekannte Vorrichtung kaum zum Dosieren und Mischen von chemisch miteinander reagierenden Flüssigkeiten geeignet, da bereits geringe Rückstände von verfestigten oder ausgehärteten Substanzen in der Vorrichtung einen ordnungsgemäßen Betrieb derselben unmöglich machen würden.In Patent Abstract of Japan, Vol. 5, No. 32 (C-45) (703), February 25, 1981, describes such a device for metering and mixing two chemically non-reacting liquids. The known device does not work very reliably and doses the two components relatively imprecisely. It is not possible to change the dosage ratio of the two components. The known device is also hardly suitable for metering and mixing chemically reacting liquids, since even small residues of solidified or hardened substances in the device would make it impossible to operate them properly.

Beim Dosieren und Mischen von zwei oder mehreren Komponenten sind erhebliche Aufwendungen für die Funktionsüberwachung der Dosierung erforderlich, da sonst die Erzeugung eines einwandfreien Mischprodukts nicht gewährleistet ist, was zu erheblichem Ausschuß und großen Verlusten führen kann. Der erforderliche Betriebsüberdruck der Einzelkomponenten wird durch Manometer gemessen und angezeigt sowie durch Kontaktmanometer oder Materialdruckschalter überwacht, welche bei Ausfall einer Einzelkomponente oder bei Absinken des Betriebsüberdruckes die für das Dosieren und Mischen verwendete Anlage auf Störung schalten. Auch direkt an den für das Dosieren verwendeten Dosierpumpen kann ein einwandfreies Funktionieren des Förderns und Dosierens jeder Komponente überwacht und angezeigt werden. Mit Durchfluß-Meßzellen können beispielsweise die eine Dosierpumpe durchströmenden Materialströme überwacht und z.B. zum Ausgleich von Dichtigkeiten fallweise geregelt werden.When dosing and mixing two or more components, there are considerable expenses for function monitoring the dosage required, otherwise the production of a perfect mixed product is not guaranteed, which can lead to considerable rejects and large losses. The required operating pressure of the individual components is measured and displayed by pressure gauges and monitored by contact pressure gauges or material pressure switches, which switch the system used for dosing and mixing to malfunction if a single component fails or the operating pressure drops. Proper functioning of the conveying and dosing of each component can also be monitored and displayed directly on the dosing pumps used for dosing. With flow measuring cells, for example, the material flows flowing through a metering pump can be monitored and regulated, for example, to compensate for leaks.

Der Erfindung liegt die Aufgabe zugrunde, die bekannte Vorrichtung so zu verbessern, daß eine sehr genaue und veränderbare Dosierung und Mischung von zwei oder mehreren flüssigen Komponenten, insbesondere auch chemisch miteinander reagierender Komponenten in sehr zuverlässiger Weise möglich wird.The invention has for its object to improve the known device so that a very precise and variable dosage and mixing of two or more liquid components, in particular also chemically reacting components is possible in a very reliable manner.

Diese Aufgabe wird bei einer Vorrichtung der eingangs genannten Art erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.This object is achieved according to the invention in a device of the type mentioned at the outset by the features of claim 1.

Bei der erfindungsgemäßen Vorrichtung wird der Vorgang des Pumpens in der für die Dosierung der ersten Komponente vorgesehen Hauptpumpe unmittelbar für die Vermischung der Einzelkomponenten ausgenützt, und es ist im einfachsten Falle kein zusätzlicher Mischer mehr erforderlich. Falls sich die Komponenten bei der eintretenden chemischen Reaktion verfestigen, beispielsweise bei Zugabe eines Härters zu einer Grundkomponente, wie es bei Farben und Lacken häufig der Fall ist, wird natürlich vorausgesetzt, daß die chemische Reaktionszeit wenigstens etwas länger ist als ein Doppelhub der Hauptpumpe einschließlich der darauf folgenden Verarbeitungszeit durch eine Applikationseinrichtung, z.B. eine Spritzpistole oder dgl. In den meisten Fällen wird die Reaktionszeit ohnehin wesentlich länger sein.In the device according to the invention, the pumping process in the main pump provided for metering the first component is used directly for mixing the individual components, and in the simplest case no additional mixer is required. If the components solidify during the chemical reaction that occurs, for example when adding a hardener to a basic component, as is often the case with paints and varnishes If this is the case, it is of course assumed that the chemical reaction time is at least somewhat longer than a double stroke of the main pump including the subsequent processing time by an application device, for example a spray gun or the like. In most cases the reaction time will be considerably longer anyway.

Das mit der erfindungsgemäßen Vorrichtung durchgeführte Verfahren widerspricht jeglichem Herkommen, da man bisher sorgsam vermied, mehrere chemisch miteinander reagierende, insbesondere sich verfestigende oder aushärtende Komponenten bereits vor der Ansaugung der Hauptkomponente in die Hauptpumpe miteinander zu vermischen. Man nimmt bei diesem Verfahren in Kauf, daß die miteinander reagierenden Komponenten die Pumpe verschmutzen und sich in derselben verfestigen könnten, wenn dies nicht durch Pumpen von neuem Material innerhalb der Verarbeitungszeit oder durch gründliche Reinigung in gewissen Zeitabständen oder jedenfalls nach Betriebsschluß verhindert wird. Dieser verhältnismäßig geringfügige Nachteil steht aber in keinem Verhältnis zu der erzielten Vereinfachung einer derartigen Mischanlage und zu der Ersparnis bei ihrer Herstellung.The method carried out with the device according to the invention contradicts any origin, since it has hitherto been carefully avoided to mix several components which react chemically with one another, in particular solidifying or hardening, before the main component is drawn into the main pump. With this method, it is accepted that the components which react with one another may contaminate and solidify the pump if this is not prevented by pumping new material within the processing time or by thorough cleaning at certain intervals or in any case after the end of operation. This relatively minor disadvantage, however, bears no relation to the simplification of such a mixing plant and the savings in its manufacture.

Während des Förderns der zusammengeführten Einzelkomponenten unter den erforderlichen Betriebsüberdrücken entstehen innerhalb der Hauptdosierpumpe einer gründlichen Vermischung der Komponenten dienende Strömungen und Verwirbelungen, die beim Durchpressen des Materials durch das stets vorgesehene Hochdruckfilter und die angeschlossene Förderleitung noch verstärkt werden.During the conveying of the merged individual components under the required operating pressures, the main metering pump creates a thorough mixing of the components, resulting in flows and eddies which are further increased when the material is pressed through the always provided high pressure filter and the connected delivery line.

Wesentlich ist, daß die zweite und gegebenenfalls weitere Komponenten während der Ansaugung eines durch einen Doppelhub der Hauptpumpe definierten dosierten Volumens der ersten Komponente beigemischt werden. Um ein gewünschtes Dosierverhältnis zwischen den Komponenten zu erzielen, müssen vor Betriebsbeginn Berechnungen angestellt und die Dosierhübe der Dosierpumpen für die zweite und weitere Komponenten so eingestellt werden, daß die dosierten Volumina der zweiten und weiteren Komponenten zusammen mit dem dosierten Volumen der ersten Komponente jeweils das Volumen eines Doppelhubes der Hauptdosierpumpe für die erste Komponente ergeben. Daraus folgt der große Vorteil, daß der Hub der Hauptpumpe stets gleich bleiben kann und daher überhaupt keine Einrichtungen zur Verstellung des Hubes mehr benötigt. Auch die Dosierpumpen für die zweite und gegebenenfalls weitere Komponenten können grundsätzlich einen gleichbleibenden Hub besitzen und keine Verstelleinrichtungen aufweisen, falls mit einer bestimmten Vorrichtung immer die gleichen Dosiermengen zudosiert werden sollen. In diesem Falle könnte trotzdem durch gewisse Umbauarbeiten oder Austausch natürlich eine einzelne Dosierpumpe in ihrem Hub jederzeit verändert werden.It is essential that the second and possibly further components are added to the first component during the intake of a metered volume defined by a double stroke of the main pump. To a desired dosage ratio To achieve between the components, calculations must be made before the start of operation and the metering strokes of the metering pumps for the second and further components must be set so that the metered volumes of the second and further components together with the metered volume of the first component each represent the volume of a double stroke of the main metering pump for the first component. This has the great advantage that the stroke of the main pump can always remain the same and therefore no longer requires any facilities for adjusting the stroke. The metering pumps for the second and possibly further components can in principle have a constant stroke and have no adjustment devices if the same metering amounts are always to be metered in with a specific device. In this case, of course, a single metering pump could of course be changed at any time by certain modifications or replacements.

In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltung der Erfindung unter Schutz gestellt.In the dependent claims, advantageous embodiments of the invention are protected.

Bei Verwendung höherviskoser Komponenten ist gemäß Anspruch 2 die Vorschaltung eines Vormischers möglich, und in extremen Fällen können nach Anspruch 3 auch noch weitere Mischer verschiedener Art je nach den Erfordernissen der Hauptpumpe vor- bzw. nachgeschaltet werden.If higher-viscosity components are used, a pre-mixer can be connected upstream, and in extreme cases further mixers of various types can be connected upstream or downstream depending on the requirements of the main pump.

Zweckmäßigerweise münden nach Anspruch 4 die Dosierventile bündig in den Ansaugweg der Hauptkomponente, was einerseits eine exakte Einhaltung der dosierten Mengen bei der Zudosierung gewährleistet und andererseits verhindert, daß Teile der Hauptkomponente in die Förderleitungen für die zudosierten Komponenten eindringen und somit eine Verschmutzung eintritt, die eine spätere Reinigung erfordert.Appropriately, according to claim 4, the metering valves flow flush into the suction path of the main component, which on the one hand ensures exact adherence to the metered quantities during metering and on the other hand prevents parts of the main component from penetrating into the delivery lines for the metered components and thus contamination occurring, which is a subsequent cleaning required.

Nach Anspruch 5 kann das Hubvolumen der Dosierpumpen für die zudosierten Komponenten einstellbar sein, wodurch eine Veränderung der Dosierungsverhältnisse sehr vereinfacht wird.According to claim 5, the stroke volume of the metering pumps for the metered components can be adjustable, whereby a change in the metering ratios is very simplified.

Um die Beimischung der zweiten und weiteren Komponenten zur ersten Komponente während des Ansaugens derselben durch die Hauptpumpe zu gewährleisten, müssen die zur Saugseite der Hauptpumpe führenden Förderleitungen für die zuzumischenden Komponenten ein Dosierventil besitzen, das so gesteuert wird, daß die jeweilige Komponente während des Befüllhubes der Hauptpumpe eingespeist wird. Die Dosierpumpen für die zweite und weitere Komponenten sind daher abhängig vom Pumpenrhythmus der Hauptpumpe und warten jeweils ab, bis der nächste Befüllhub der Hauptpumpe beginnt. Das jeweilige Dosierventil öffnet sich gleichzeitig mit dem Beginn des Befüllhubes und ist nur während des Befüllhubes geöffnet.In order to ensure the admixture of the second and further components to the first component during the suction of the same by the main pump, the feed lines leading to the suction side of the main pump for the components to be mixed must have a metering valve which is controlled so that the respective component during the filling stroke of the Main pump is fed. The metering pumps for the second and other components are therefore dependent on the pump rhythm of the main pump and each wait until the next filling stroke of the main pump begins. The respective metering valve opens simultaneously with the start of the filling stroke and is only open during the filling stroke.

Falls die Dosiermengen der zudosierten Komponenten veränderlich sein sollen, ist eine Ausführungsform gemäß Anspruch 6 sehr zweckmäßig, bei der eine Hubverstellung der einzelnen Dosierpumpen in einfachster Weise vorgenommen werden kann.If the metered quantities of the metered components are to be variable, an embodiment according to claim 6 is very expedient in which the stroke adjustment of the individual metering pumps can be carried out in the simplest way.

Um die Zuführung der zuzudosierenden Komponenten zu überwachen, kann gemäß Anspruch 7 jeweils ein Materialdruckschalter vorgesehen werden, der ebenfalls durch die pneumatische Folgeschaltung gesteuert wird. Dabei entsteht, wenn sich der Materialdruckschalter in der Abwarteposition bis zum nächsten Doppelhub der Hauptpumpe befindet, in der zugehörigen Dosierpumpe ein Überdruck. Dieser wird von dem Materialdruckschalter erkannt. Bei ordnungsgemäßem Betrieb der jeweiligen Dosierpumpe gibt der Materialdruckschalter kein Signal ab. Bei mangelhaftem Betrieb gibt er jedoch ein Signal auf die pneumatische Steuerung, wodurch eine Alarm- oder Abschalteinrichtung ausgelöst wird. Das Signal kann auch auf eine elektrische Dokumentationseinrichtung, z.B. einen Zeilenschreiber, gegeben werden.In order to monitor the supply of the components to be metered, a material pressure switch can be provided according to claim 7, which is also controlled by the pneumatic sequential circuit. When the material pressure switch is in the waiting position until the next double stroke of the main pump, an excess pressure is created in the associated metering pump. This is recognized by the material pressure switch. If the respective metering pump is operating correctly, the material pressure switch does not emit a signal. In the event of poor operation, however, it gives a signal to the pneumatic control, which triggers an alarm or shutdown device. The signal can also be given to an electrical documentation device, for example a line recorder.

Um eine Dosierkontrolle, eine anfängliche Befüllung sowie eine Reinigung der einzelnen Dosierpumpen und Förderleitungen zu erleichtern, kann gemäß Anspruch 8 ein z.B. von Hand umschaltbares Umschaltventil mit mehreren Stellungen und Wegen vorgesehen sein. Die Anzahl von Stellungen und Wegen übersteigt dabei die Anzahl der Komponenten jeweils um 1. Beispielsweise wird bei einer Vorrichtung für zwei Komponenten ein 3/3-Wegeventil benötigt, um die Einzelsteuerung jeder der beiden Komponenten sowie in der dritten Stellung eine Steuerung der Vermischung der beiden Komponenten zu bewirken. Natürlich können grundsätzlich auch Einzelschalter vorgesehen werden, jedoch vereinfacht die Verwendung eines solchen Umschaltventils die Vorrichtung wesentlich.In order to facilitate metering control, initial filling and cleaning of the individual metering pumps and delivery lines, a e.g. manually switchable changeover valve with multiple positions and paths can be provided. The number of positions and paths exceeds the number of components by 1. For example, a device for two components requires a 3/3-way valve to control each of the two components individually and to control the mixing of the two in the third position Components. Individual switches can of course also be provided in principle, but the use of such a changeover valve considerably simplifies the device.

Bei Verwendung von höherviskosen und insbesondere hochviskosen Komponenten genügt die Verwendung von zusätzlichen statischen oder dynamischen Mischern unter Umständen nicht mehr. In diesem Falle kann gemäß den Ansprüchen 9 bis 12 eine Verflüssigung der Komponenten durch Materialbewärmung vorgenommen werden, so daß keine Beeinträchtigung von Förderung und Dosierung der hochviskosen Komponenten erfolgt, was zu einer Fehlfunktion der ganzen Vorrichtung führen würde.When using higher-viscosity and in particular highly-viscous components, the use of additional static or dynamic mixers may no longer be sufficient. In this case, according to claims 9 to 12, the components can be liquefied by material heating, so that there is no impairment of the conveying and metering of the highly viscous components, which would lead to a malfunction of the entire device.

Anhand der Figuren werden Ausführungsbeispiele der Erfindung näher erläutert. Es zeigen

Fig. 1 bis 3
Fließschemata einer ersten bis dritten Ausführungsform der erfindungsgemäßen Vorrichtung und
Fig. 4
eine Schaltskizze der pneumatischen Steuerung für die dritte Ausführungsform gemäß Fig. 3.
Exemplary embodiments of the invention are explained in more detail with reference to the figures. Show it
1 to 3
Flow diagrams of a first to third embodiment of the device according to the invention and
Fig. 4
3 shows a circuit diagram of the pneumatic control for the third embodiment according to FIG. 3.

In allen Figuren sind für gleiche oder entsprechende Teile die gleichen Bezugszeichen verwendet.The same reference numerals are used in all figures for the same or corresponding parts.

Bei der in Fig. 1 dargestellten einfachsten Ausführungsform der erfindungsgemäßen Vorrichtung ist als erste Dosierpumpe 10 für eine in einem Vorratsbehälter 12 angeordnete, nicht dargestellte erste Komponente und eine kleinere zweite Dosierpumpe 14 für eine in einem Vorratsbehälter 16 angeordnete, nicht dargestellte zweite Komponente vorgesehen. Die erste Komponente kann beispielsweise ein lackartiges Grundmaterial und die zweite Komponente ein Härtermaterial sein. Beide Dosierpumpen 10 und 14 sind als doppeltwirkende Differenzkolbenpumpen ausgebildet, welche durch je einen doppelt wirkenden pneumatischen Antriebszylinder 17 bzw. 18 angetrieben sind. Der ersten Dosierpumpe 10 ist ein statischer Vormischer 20 und ein Vorsieb 22 vorgeschaltet. Die erste Komponente wird aus dem Vorratsbehälter 12 über ein Ansaugrohr 24 angesaugt. Der zweiten Dosierpumpe 14 ist ein Vorsieb 26 vorgeschaltet, das mit einem in die zweite Komponente im Vorratsbehälter 16 eintauchenden Ansaugrohr 28 in Verbindung steht.In the simplest embodiment of the device according to the invention shown in FIG. 1, the first metering pump 10 for a first component (not shown) arranged in a storage container 12 and a smaller second metering pump 14 for a second component (not shown) arranged in a storage container 16 are provided. The first component can be, for example, a lacquer-like base material and the second component can be a hardening material. Both metering pumps 10 and 14 are designed as double-acting differential piston pumps, each of which is driven by a double-acting pneumatic drive cylinder 17 or 18. The first metering pump 10 is preceded by a static premixer 20 and a prescreen 22. The first component is sucked out of the reservoir 12 via a suction pipe 24. The second metering pump 14 is preceded by a prescreen 26, which is connected to an intake pipe 28 immersed in the second component in the reservoir 16.

An die Druckseite der ersten Dosierpumpe 10 ist ein Hochdruckfilter 30 mit Siebeinsatz 32 angeschlossen, das über einen Entlastungshahn 34 und eine Entlastungsleitung 36 mit dem Vorratsbehälter 12 in Verbindung steht. Andererseits steht das Hochdruckfilter 30 über einen weiteren statischen Mischer 38 und eine Applikationsleitung 40 mit einer als Spritzpistole 42 ausgebildeten Applikationseinrichtung in Verbindung. Die Druckseite der zweiten Dosierpumpe 14 steht über einen Entlastungshahn 44 und eine Entlastungsleitung 46 wiederum mit dem Vorratsbehälter 16 in Verbindung. Ferner ist an die Druckseite der zweiten Dosierpumpe 14 eine Förderleitung 48 angeschlossen, die in ein Dosierventil 50 mündet, das seinerseits mit seinem Ventilsitz 52 bündig in den Vormischer 20 mündet.A high-pressure filter 30 with strainer insert 32 is connected to the pressure side of the first metering pump 10 and is connected to the reservoir 12 via a relief valve 34 and a relief line 36. On the other hand, the high-pressure filter 30 is connected via a further static mixer 38 and an application line 40 to an application device designed as a spray gun 42. The pressure side of the second metering pump 14 is in turn connected to the storage container 16 via a relief valve 44 and a relief line 46. Furthermore, a delivery line 48 is connected to the pressure side of the second metering pump 14 and leads into a metering valve 50 opens, which in turn opens flush with the valve seat 52 in the premixer 20.

Beide Dosierpumpen 10 und 14 weisen ein festes, nicht ohne weiteres verstellbares Dosiervolumen auf. Dieses wird jeweils so gewählt, daß das beim Saughub der ersten Dosierpumpe 10 angesaugte Gesamtvolumen gleich der Summe des aus dem Vorratsbehälter 12 während dieses Saughubes angesaugten Dosiervolumens der ersten Komponente und des während des gleichen Saughubes durch das Dosierventil 50 in den Mischer 20 eingespeisten und einem Saughub der Dosierpumpe 14 entsprechenden Dosiervolumens der zweiten Komponente entspricht. Das Dosierverhältnis der beiden Komponenten ist dadurch genau festgelegt. Diese Ausführungsform eignet sich daher besonders für Anwendungen, bei denen immer das gleiche Material appliziert werden soll. Wenn trotzdem das Dosierverhältnis ausnahmsweise geändert werden soll, so kann durch relativ schnellen Umbau die zweite Dosierpumpe 14 auf das erforderliche Dosiervolumen eingestellt werden.Both metering pumps 10 and 14 have a fixed, not easily adjustable metering volume. This is chosen so that the total volume sucked in during the suction stroke of the first metering pump 10 is equal to the sum of the metered volume of the first component sucked in from the reservoir 12 during this suction stroke and that fed into the mixer 20 through the metering valve 50 during the same suction stroke and one suction stroke the metering pump 14 corresponds to the corresponding metering volume of the second component. The dosage ratio of the two components is precisely defined. This embodiment is therefore particularly suitable for applications in which the same material is always to be applied. If the dosing ratio is nevertheless to be changed exceptionally, the second dosing pump 14 can be set to the required dosing volume by relatively rapid conversion.

Durch eine nicht gezeigte pneumatische Steuerung lassen sich die einzelnen Teile der Vorrichtung in der geschilderten ten Weise mit folgendem Arbeitsablauf steuern.By means of a pneumatic control, not shown, the individual parts of the device can be controlled in the manner described with the following workflow.

Zur Inbetriebnahme der Vorrichtung werden die Entlastungshähne 34 und 44 geöffnet, so daß die durch die Ansaugrohre 24 bzw. 28 angesaugten Komponenten im Kreislauf über die Dosierpumpen 10 bzw. 14 und die Entlastungsleitungen 36 bzw. 46 in die Vorratsbehälter 12 bzw. 16 zurückströmen können. Hierbei bleibt das Dosierventil 50 geschlossen. Dadurch werden die Ansaugsysteme und die Dosierpumpen befüllt. Anschließend werden die Entlastungshähne 34 bzw. 44 wieder geschlossen. Ferner kann eine Funktionskontrolle beider Dosierpumpen getrennt bei geöffneten Entlastungshähnen 34, 44 sowie unter Betriebsbedingungen gemeinsam bei geschlossenen Entlastungshähnen 34 bzw. 44 an der Spritzpistole 42 jeweils mittels einer Meßblende 130 und eines Meßbechers 54 oder dgl. vorgenommen werden, was durch die gestrichelt eingezeichnete Lage der Applikationsleitung 40 angedeutet ist.To start up the device, the relief valves 34 and 44 are opened so that the components sucked in through the suction pipes 24 and 28 can flow back into the reservoir 12 and 16 via the metering pumps 10 and 14 and the relief lines 36 and 46, respectively. The metering valve 50 remains closed. This will fill the suction systems and the metering pumps. The relief valves 34 and 44 are then closed again. Furthermore, a function check of both metering pumps can be carried out separately when the relief valves 34, 44 are open and under operating conditions together when the valves are closed Relief taps 34 and 44 on the spray gun 42 are each made by means of a measuring orifice 130 and a measuring cup 54 or the like, which is indicated by the position of the application line 40 shown in broken lines.

Vor Betriebsbeginn wird die Förderleitung 48 bis zum Ventilsitz mit der zweiten Komponente befüllt. Die im Vormischer 20 und beim Durchströmen der ersten Dosierpumpe 10 vorgemischten Komponenten werden im nachgeschalteten statischen Mischer 38 noch weiter vermischt und sodann durch die als Hochdruckschlauch ausgebildete Applikationsleitung 40 der Spritzpistole 42 zugeführt und durch dieselbe versprüht. Das Dosierventil 50 wird durch die pneumatische Steuerung so gesteuert, daß es mit Beginn des Saughubes der ersten Dosierpumpe 10 öffnet. Gleichzeitig beginnt der Saughub der zweiten Dosierpumpe 14, so daß während des Ansaugens der ersten Komponente aus dem Vorratsbehälter 12 das genaue Dosiervolumen der zweiten Dosierpumpe 14 in den Mischer 20 eingespeist wird. Das Dosierventil 50 schließt sich sodann spätestens beim Ende des Saughubes der ersten Dosierpumpe 10, so daß genau dosierte Volumina der ersten und zweiten Komponente vermischt und durch die Dosierpumpe 10 in den Mischer 38 und die Applikationsleitung 40 gefördert werden. Da der Ventilsitz 52 des Dosierventils 50 bündig in der Wand des Vormischers 20 liegt, entsteht kein toter Raum und somit keine Verfälschung der dosierten Volumina.Before the start of operation, the delivery line 48 is filled with the second component up to the valve seat. The components premixed in the premixer 20 and when flowing through the first metering pump 10 are mixed further in the downstream static mixer 38 and then fed through the application line 40 designed as a high-pressure hose to the spray gun 42 and sprayed by the same. The metering valve 50 is controlled by the pneumatic control so that it opens at the start of the suction stroke of the first metering pump 10. At the same time, the suction stroke of the second metering pump 14 begins, so that the exact metering volume of the second metering pump 14 is fed into the mixer 20 while the first component is being sucked out of the storage container 12. The metering valve 50 then closes at the latest at the end of the suction stroke of the first metering pump 10, so that precisely metered volumes of the first and second components are mixed and conveyed by the metering pump 10 into the mixer 38 and the application line 40. Since the valve seat 52 of the metering valve 50 lies flush in the wall of the premixer 20, there is no dead space and therefore no falsification of the metered volumes.

Bei Betriebsunterbrechung wird das Ansaugrohr 24 in einen nicht gezeigten Reinigungsmittelvorrat eingetaucht, der in an sich bekannter Weise durch sämtliche von den gemischten Komponenten benetzte Teile der Vorrichtung, insbesondere die erste Dosierpumpe 10, das Hochdruckfilter 30, den Mischer 38, die Applikationsleitung 40 und die Spritzpistole 42, gedrückt wird, welche dadurch gründlich gereinigt werden. Das Dosierventil 50 bleibt beim Reinigungsvorgang wiederum geschlossen. Falls erforderlich, können auch die übrigen Teile der Vorrichtung von den verschiedenen Komponenten gereinigt werden.When the operation is interrupted, the suction pipe 24 is immersed in a detergent supply (not shown) which, in a manner known per se, comprises all parts of the device wetted by the mixed components, in particular the first metering pump 10, the high-pressure filter 30, the mixer 38, the application line 40 and the spray gun 42, which is cleaned thoroughly. The metering valve 50 remains in turn during the cleaning process closed. If necessary, the remaining parts of the device can also be cleaned of the various components.

Die in Fig. 2 dargestellte zweite Ausführungsform unterscheidet sich von der Ausführungsform gemäß Fig. 1 dadurch, daß eine sehr einfache Verstellvorrichtung für den Dosierhub der zweiten Dosierpumpe 14 vorgesehen ist. Dadurch kann in sehr einfacher Weise das Dosierverhältnis der beiden Komponenten verändert werden. Der doppeltwirkende pneumatische Antriebszylinder 18 der zweiten Dosierpumpe 14 weist eine im Freihub geführte Kolbenstange 56 auf, welche im Sinn des Doppelpfeils 58 hin und her bewegt wird. Die Dosierpumpe 14 und der Antriebszylinder 18 sind dabei jeweils mit einer Flanschplatte 60 bzw. 62 fest verbunden, die durch axial verlaufende Stangen 64, 66 in festem gegenseitigen Abstand gehalten werden. Auf der Stange 66 sind jeweils Rollenventile 68 und 70 axial verstellbar angebracht, die in beliebigen axialen Stellungen längs der Stange 66 festgelegt werden können. Ferner trägt die Kolbenstange 56 einen Betätigungsblock 72, der sich mit der Kolbenstange 56 hin und her bewegt und jeweils abwechselnd das als oberer Hubbegrenzer dienende Rollenventil 68 sowie das als unterer Hubbegrenzer dienende Rollenventil 70 betätigt. Die Rollenventile 68, 70 werden entsprechend einer vorbestimmten, dem gewünschten Dosierungsverhältnis entsprechenden Höhe der zweiten Dosierpumpe 14 längs der Stange 66 eingestellt und sind in geeigneter Weise mit der nicht dargestellten pneumatischen Steuerung der Vorrichtung verbunden, die ihrerseits die Antriebszylinder 17, 18 entsprechend der eingestellten Hubhöhe steuert. Durch die Dosierpumpen 10 und 14 werden die beiden Flüssigkeitskomponenten daher im richtigen Dosierverhältnis dosiert und weitergefördert.The second embodiment shown in FIG. 2 differs from the embodiment according to FIG. 1 in that a very simple adjusting device is provided for the metering stroke of the second metering pump 14. This allows the dosage ratio of the two components to be changed in a very simple manner. The double-acting pneumatic drive cylinder 18 of the second metering pump 14 has a piston rod 56 guided in the free stroke, which is moved back and forth in the direction of the double arrow 58. The metering pump 14 and the drive cylinder 18 are each firmly connected to a flange plate 60 or 62, which are held at a fixed mutual distance by axially extending rods 64, 66. Roller valves 68 and 70 are each axially adjustably mounted on the rod 66 and can be fixed in any axial positions along the rod 66. Furthermore, the piston rod 56 carries an actuating block 72 which moves back and forth with the piston rod 56 and alternately actuates the roller valve 68 serving as the upper stroke limiter and the roller valve 70 serving as the lower stroke limiter. The roller valves 68, 70 are set according to a predetermined, corresponding to the desired dosage ratio of the second metering pump 14 along the rod 66 and are connected in a suitable manner to the pneumatic control of the device, not shown, which in turn drives the drive cylinders 17, 18 according to the set lifting height controls. The two liquid components are therefore metered and conveyed in the correct metering ratio by the metering pumps 10 and 14.

Das in Fig. 3 gezeigte dritte Ausführungsbeispiel der erfindungsgemäßen Vorrichtung ist insbesondere für eine hochviskose erste Komponente geeignet. An der Stelle des statischen Vormischers 20 ist bei dieser Ausführungsform ein dynamischer Vormischer 74 vorgesehen, dessen Kolbenstange 76 von einem an die pneumatische Steuerung angeschlossenen pneumatischen Antriebsmotor 78 gemäß dem Doppelpfeil 80 hin und her bewegt wird und zur Verwirbelung und Vermischung der in den Vormischer 74 eingespeisten Komponenten eine Reihe von geeignet geformten Stößeln 82 trägt. Über eine Verbindungsleitung 84 ist das obere Ende des dynamischen Vormischers 74 mit dem Einlaß der ersten Dosierpumpe 10 verbunden. Der Vormischer 74 ist durch eine Hochdruckpackung 266 abgedichtet, so daß das gemischte Material nur über die Verbindungsleitung 84 der ersten Dosierpumpe zuströmen kann.The third embodiment of the invention shown in FIG. 3 The device is particularly suitable for a highly viscous first component. In this embodiment, in place of the static premixer 20, a dynamic premixer 74 is provided, the piston rod 76 of which is moved back and forth by a pneumatic drive motor 78 connected to the pneumatic control in accordance with the double arrow 80 and for swirling and mixing those fed into the premixer 74 Components carries a series of suitably shaped plungers 82. The upper end of the dynamic premixer 74 is connected to the inlet of the first metering pump 10 via a connecting line 84. The premixer 74 is sealed by a high-pressure packing 266, so that the mixed material can only flow in via the connecting line 84 of the first metering pump.

Das untere Ende des Vormischers 74 ist mit einem 3/3-Wegehahn 86 verbunden. In seiner ersten Stellung gibt der 3/3-Wegehahn 86 die Ansaugung der ersten Komponente aus dem Vorratsbehälter 12 über eine allgemein mit 88 bezeichnete Bewärmeinrichtung und eine Verbindungsleitung 90 frei. In einer Mittelstellung sperrt das Ventil 86 alle Durchgangswege und in seiner dritten Stellung öffnet es den Durchgang von einem Vorrat an Reinigungsmittel 92 über ein Reinigungsmittelrohr 94 zum Vormischer 74. Wenn sich das Ventil 86 in der letztgenannten Stellung befindet, kann ein in nicht gezeigter Weise an eine Druckluftquelle angeschlossenes Ventil 94 öffnen und über eine in ein geschlossenes Druckgefäß 96 eingeführte Leitung 98 Druckluft in das das Reinigungsmittel 92 enthaltende Druckgefäß 96 einleiten. Dadurch tritt ein Gemisch von Reinigungsmittel und Druckluft in die Reinigungsmittelleitung 94 und über diese in alle eine Mischung der beiden Komponenten enthaltende Teile der Vorrichtung ein, die dadurch besonders gut gereinigt werden, wie es anhand von Fig. 1 geschildert wurde.The lower end of the premixer 74 is connected to a 3/3 way valve 86. In its first position, the 3/3-way valve 86 releases the suction of the first component from the storage container 12 via a heating device, generally designated 88, and a connecting line 90. In a central position the valve 86 blocks all passageways and in its third position it opens the passageway from a supply of cleaning agent 92 via a cleaning agent pipe 94 to the premixer 74. When the valve 86 is in the latter position, one can turn on in a manner not shown open a valve 94 connected to a compressed air source and introduce compressed air into the pressure vessel 96 containing the cleaning agent 92 via a line 98 introduced into a closed pressure vessel 96. As a result, a mixture of cleaning agent and compressed air enters the cleaning agent line 94 and, via this, into all parts of the device containing a mixture of the two components, which are thereby cleaned particularly well, as was described with reference to FIG. 1.

Wenn sich das 3/3-Wegeventil 86 in der erstgenannten Stellung befindet, wird das hochviskose Material 100 aus dem Vorratsbehälter 12 über die Bewärmeinrichtung 88 in den Vormischer 74 angesaugt. Ein Ansaugrohr 110 mit abgewinkeltem Ende 112 taucht in das hochviskose Material 100 ein. Auf das Ende 112 ist ein flexibler Ansaugschlauch 114 flüssigkeitsdicht aufgezogen. Das entgegengesetzte Ende 116 des Ansaugschlauches 114 ist mittels einer Schraubkupplung 118 an die Verbindungsleitung 90 angeschlossen. Das Ansaugrohr 110 ist in koaxialem Abstand von einem Überrohr 144 umgeben, wobei der zwischen Ansaugrohr 110 und Überrohr 144 entstehende Zwischenraum durch radiale Wandungen 146 bzw. 148 flüssigkeitsdicht abgedichtet ist. Dieser Zwischenraum ist von wärmeleitendem Material 150 ausgefüllt, in welches ein ein Heizelement bildendes, spiralig um das Ansaugrohr 110 in Berührung mit diesem gewickeltes, seine Temperatur selbstregelndes und explosionsgeschütztes Heizband 152 eingebettet ist. An beiden Enden geht das in das wärmeleitende Material 150 eingebettete Heizband 152 in gleich oder ähnlich ausgebildete Fortsetzungen 154, 156 über, die in Anlage an der Außenseite des Ansaugschlauches 114 durch Schellen 158 gehalten und in eine den Ansaugschlauch 114 umfassende Wärmeisolierung 160 eingebettet sind. Die Fortsetzung 154 endet in einem in die Wärmeisolierung 160 eingebetteten Endabschluß 161. Die Fortsetzung 156 des Heizbandes 152 ist mit ihrem Ende 162 an einen elektrischen Anschlußkasten 164 angeschlossen, der über ein Elektrokabel 166 mit Stecker 168 an eine nicht gezeigte Stromquelle anschließbar ist. Das Überrohr 144 ist wenigstens in seinem in das Material 100 eintauchenden Abschnitt von einem Schutzrohr 170 aus wärmeisolierendem Kunststoff in koaxialem Abstand umgeben, das mittels Stegen 172 am Überrohr 144 abgestützt und gehalten ist. Die Stege 172 sind am Überrohr 144 abnehmbar abgestützt, so daß das Schutzrohr 170 zu Reinigungszwecken abgezogen werden kann. Das untere Ende des Schutzrohrs 170 ruht auf dem Boden des Vorratsbehälters 12 auf, während das untere Ende 140 des Ansaugrohrs 110 in einem geringen Abstand oberhalb des Bodens gehalten wird. Nahe seinem umteren Ende weist das Schutzrohr 170 einen Kranz von Einlaßöffnungen 174 für das die erste Komponente bildende Material 100 auf.When the 3/3-way valve 86 is in the first-mentioned position, the highly viscous material 100 is sucked out of the storage container 12 into the premixer 74 via the heating device 88. An intake pipe 110 with angled end 112 dips into the highly viscous material 100. A flexible suction hose 114 is pulled onto the end 112 in a liquid-tight manner. The opposite end 116 of the suction hose 114 is connected to the connecting line 90 by means of a screw coupling 118. The intake pipe 110 is surrounded at a coaxial distance by an overtube 144, the space created between the intake pipe 110 and the overtube 144 being sealed in a liquid-tight manner by radial walls 146 and 148, respectively. This intermediate space is filled with heat-conducting material 150, in which a heating element 152, which forms a heating element and is spirally wound around the suction pipe 110 in contact with the latter and is self-regulating and explosion-proof, is embedded. At both ends, the heating tape 152 embedded in the heat-conducting material 150 merges into extensions 154, 156 of identical or similar design, which are held in contact with the outside of the suction hose 114 by clips 158 and are embedded in a thermal insulation 160 comprising the suction hose 114. The continuation 154 ends in an end termination 161 embedded in the thermal insulation 160. The continuation 156 of the heating tape 152 is connected at its end 162 to an electrical connection box 164 which can be connected via an electrical cable 166 with a plug 168 to a power source (not shown). The overtube 144 is at least in its section immersed in the material 100 surrounded by a protective tube 170 made of heat-insulating plastic at a coaxial distance, which is supported and held on the overtube 144 by means of webs 172. The webs 172 are detachably supported on the overtube 144 so that the protective tube 170 can be removed for cleaning purposes. The lower end of the protective tube 170 is at rest on the bottom of the reservoir 12, while the lower end 140 of the suction pipe 110 is held a short distance above the bottom. Near its rear end, the protective tube 170 has a ring of inlet openings 174 for the material 100 forming the first component.

Das Schutzrohr 170 verhindert weitgehend einen Austritt der Bewärmungsenergie des Heizbandes 152 in das außerhalb des Schutzrohrs 170 befindliche Material 100. Das innerhalb des Schutzrohrs 170, des Ansaugrohrs 110 und des Ansaugschlauches 114 gebildete Gesamtvolumen wird nun z.B. so gewählt, daß für die Bewärmung des in diesem Gesamtvolumen befindlichen Materials bei normalem Betrieb der Spritzpistole 42 mit der jeweils gewählten Weite der aufgeschraubten Spritzdüse mindestens eine Minute Bewärmzeit zur Verfügung steht. Dadurch wird einerseits eine Energieverschwendung in dem außerhalb des Schutzrohrs 170 gelegenen Bereich des Materials 100 verhindert und andererseits eine gleichmäßige Ansaugung und Zuführung des Materials in die erste Dosierpumpe 10 durch ausreichende Bewärmung und dadurch Verflüssigung des Materials gewährleistet.The protective tube 170 largely prevents the heating energy of the heating tape 152 from escaping into the material 100 located outside the protective tube 170. The total volume formed within the protective tube 170, the suction tube 110 and the suction hose 114 is now e.g. chosen so that at least one minute of heating time is available for heating the material in this total volume during normal operation of the spray gun 42 with the respectively selected width of the screwed-on spray nozzle. On the one hand, this prevents energy wastage in the area of the material 100 located outside the protective tube 170 and, on the other hand, ensures a uniform suction and supply of the material into the first metering pump 10 through sufficient heating and thereby liquefaction of the material.

Schließlich unterscheidet sich die Ausführungsform nach Fig. 3 von den vorangehenden noch dadurch, daß in die Förderleitung 48 ein Materialdruckschalter 176 eingeschaltet ist, der aus einem von der zweiten Komponente ausgefüllten Materialraum 178 und einem von diesem durch eine Membran 180 getrennten Druckluftraum 182 besteht. Je nach den auftretenden Betriebsdrücken bewegt sich die Membran 180 in Richtung Materialraum 178 oder Druckluftraum 182. Durch diese Bewegung der Membran 180 wird ein Stößel 184 bewegt, welcher ein 3/2-Wegeventil 186 schaltet, über welches bei eintretendem Materialmangel eine diesen Materialmangel anzeigende Einrichtung betätigt wird.Finally, the embodiment according to FIG. 3 differs from the previous one in that a material pressure switch 176 is switched on in the delivery line 48, which consists of a material space 178 filled by the second component and a compressed air space 182 separated from it by a membrane 180. Depending on the operating pressures that occur, the diaphragm 180 moves in the direction of the material space 178 or compressed air space 182. This movement of the diaphragm 180 moves a plunger 184 which switches a 3/2-way valve 186, via which a device indicating this material deficiency occurs when there is a lack of material is operated.

Fig. 4 zeigt eine pneumatische Schaltskizze für die in Fig. 3 gezeigte Ausführungsform, der jedoch nach analoger Anpassung auch für die übrigen Ausführungsformen Gültigkeit hat.FIG. 4 shows a pneumatic circuit diagram for the embodiment shown in FIG. 3, which, however, is also valid for the other embodiments after an analog adjustment.

Eine Haupt-Druckluftquelle wird an einen Hauptluftanschluß 188 angeschlossen. Die zugeführte Druckluft wird sodann über einen Wasserabscheider 190 geführt und gereinigt. Die an den Wasserabscheider 190 anschließende Leitung 192 ist über zwei Stichleitungen 194 und 196 an ein als 5/3-Wegeventil ausgebildetes 3/3-Wegeventil 198 angeschlossen, welches in drei Stellungen schaltbar ist, und zwar in die Stellung 201, in der es die Hauptluft nur der ersten Dosierpumpe 10 und den damit verbundenen Teilen der Vorrichtung zuführt, in die Stellung 202, in der es die Hauptluft nur der zweiten Dosierpumpe 14 und den angeschlossenen Teilen zuführt, und in die Mittelstellung 203, in der es den Betrieb beider Dosierpumpen steuert. Über einen an die Leitung 192 angeschlossenen Druckluftregler 204 wird der Betriebsdruck der Vorrichtung geregelt, der am Betriebsdruckanzeiger 206 angezeigt wird. Über eine an den Druckregler 204 angeschlossene Leitung 208 wird ein 5/2-Umsteuerventil 210 für den Antriebszylinder 78 angesteuert.A main source of compressed air is connected to a main air port 188. The compressed air supplied is then passed through a water separator 190 and cleaned. The line 192 connected to the water separator 190 is connected via two branch lines 194 and 196 to a 3/3-way valve 198 which is designed as a 5/3-way valve and which can be switched into three positions, to the position 201 in which it is Main air supplies only the first metering pump 10 and the associated parts of the device, in the position 202, in which it supplies the main air only to the second metering pump 14 and the connected parts, and in the central position 203, in which it controls the operation of both metering pumps . The operating pressure of the device, which is displayed on the operating pressure indicator 206, is regulated via a compressed air regulator 204 connected to the line 192. A 5/2 reversing valve 210 for the drive cylinder 78 is actuated via a line 208 connected to the pressure regulator 204.

Die durch das 3/3-Wegeventil 198 gesteuerte Druckluft wird über einen Druckluftregler 212 geführt und der Druck wird am Betriebsüberdruckanzeiger 214 angezeigt. Über eine Leitung 216 wird ein 5/2-Umsteuerventil 218 für den Antriebszylinder 17 angesteuert. Das Umsteuerventil 218 steuert die Hin- und Herbewegung des Antriebszylinders 17 für die erste Dosierpumpe 10. Die Hübe des Arbeitszylinders 17 werden durch ein über die Leitung 220 angeschlossenes 3/3-Wegeventil 222 abgetastet, welches Steuerimpulse über eine Leitung 224 an die pneumatische Steuerung 226 der Vorrichtung gibt.The compressed air controlled by the 3/3-way valve 198 is passed through a compressed air regulator 212 and the pressure is displayed on the operating pressure indicator 214. A 5/2 reversing valve 218 for the drive cylinder 17 is controlled via a line 216. The reversing valve 218 controls the reciprocation of the drive cylinder 17 for the first metering pump 10. The strokes of the working cylinder 17 are sensed by a 3/3-way valve 222 connected via the line 220, which control impulses via a line 224 to the pneumatic control 226 the device there.

Die zweite Dosierpumpe 14 wird gesteuert über einen Druckluftregler 228 mit einem Betriebsüberdruckanzeiger 230, wobei der Druckluftregler 228 über eine Druckleitung 232 mit einem 5/3-Wegeventil 234 verbunden ist, das über Leitungen 236 und 252 an die pneumatische Folgesteuerung 226 angeschlossen ist. Das 5/3-Wegeventil 234 läßt die Hauptluft in den Arbeitszylinder 18 der zweiten Dosierpumpe 14 einströmen. Die Hubhöhe des Antriebszylinders 18 und somit der ersten Dosierpumpe 14 wird in der oben geschilderten Weise mittels der verstellbaren Rollenventile 68 und 70 sowie des Betätigungsblockes 72 gesteuert. Die vom Vorratsbehälter 16 der zweiten Dosierpumpe 14 zuströmende zweite Komponente strömt nach Verlassen der Dosierpumpe 14 über die Druckleitung 238 in den Materialdruckschalter 176 und aus diesem zum Dosierventil 50. Die Betriebsüberdrücke verändern die Position der Membran 180 im Materialdruckschalter 176, so daß der die Membranstellung abtastende Stößel 184 den jeweiligen Betriebszustand erkennen kann und diesen über das 3/2-Wegeventil 186 und eine angeschlossene Leitung 242 an die pneumatische Steuerung 226 weitergibt. Der Betriebsvordruck wird von der pneumatischen Steuerung 226 geregelt und über eine Druckleitung 244 dem Materialdruckschalter 176 zugeführt.The second metering pump 14 is controlled by a compressed air regulator 228 with an operating pressure indicator 230, the compressed air regulator 228 being connected via a pressure line 232 to a 5/3-way valve 234 which is connected to the pneumatic sequence control 226 via lines 236 and 252. The 5/3-way valve 234 allows the main air to flow into the working cylinder 18 of the second metering pump 14. The lifting height of the drive cylinder 18 and thus the first metering pump 14 is controlled in the manner described above by means of the adjustable roller valves 68 and 70 and the actuation block 72. The second component flowing from the reservoir 16 of the second metering pump 14 flows after leaving the metering pump 14 via the pressure line 238 into the material pressure switch 176 and from there to the metering valve 50. The operating pressures change the position of the membrane 180 in the material pressure switch 176 so that the membrane position is sensed Tappet 184 can recognize the respective operating state and passes this on to the pneumatic control 226 via the 3/2-way valve 186 and a connected line 242. The operating form is regulated by the pneumatic control 226 and supplied to the material pressure switch 176 via a pressure line 244.

Damit die Antriebszylinder 17 und 18 gleichzeitig ihren Betrieb beginnen, wird eine Starttaste 246 betätigt, wodurch das angeschlossene Startventil 248 über eine Leitung 250 die Steuerung 226 ansteuert. An die Steuerung 226 angeschlossene Anzeigeeinrichtungen 254 und 268 zeigen jeweils das Dosierhubende des Arbeitszylinders 17 bzw. 18 an. Um anzuzeigen, daß die zweite Dosierpumpe 14 mit dem vorgegebenen Betriebsüberdruck fördert und dosiert, ist über eine weitere Leitung 256 ein 5/2-Signalventil 258 an die Steuerung 226 angeschlossen. Über die Stellung dieses Signalventils 258 kann bei Materialmangel eine visuelle Anzeigevorrichtung 260 und/oder eine akustische Anzeigevorrichtung 262 ausgelöst werden.So that the drive cylinders 17 and 18 start their operation at the same time, a start button 246 is actuated, as a result of which the connected start valve 248 controls the controller 226 via a line 250. Display devices 254 and 268 connected to the control 226 each show the end of the metering stroke of the working cylinder 17 and 18, respectively. In order to indicate that the second metering pump 14 is delivering and metering with the predetermined operating pressure, a 5/2 signal valve 258 is connected to the controller 226 via a further line 256. If there is a shortage of material, a visual display device 260 and / or an acoustic display device 262 can be triggered via the position of this signal valve 258.

Der Materialdruckschalter 176 kontrolliert den Betriebsdruck am Dosierventil 50, das über eine Druckluftleitung 264 mit der Folgesteuerung 226 in Verbindung steht. Die Folgesteuerung 226 steuert das Dosierventil 50 so, daß es nur während des Befüllhubes der ersten Dosierpumpe 10 öffnet und das von der zweiten Dosierpumpe 14 geförderte und dosierte Material in den Vormischer 74 einströmen läßt. Da bei dieser Ausführungsform viskoses Material gefördert wird, werden die beiden Komponenten im dynamischen Vormischer 74 vorgemischt.The material pressure switch 176 controls the operating pressure at the metering valve 50, which is connected to the sequence control 226 via a compressed air line 264. The sequential control 226 controls the metering valve 50 such that it only opens during the filling stroke of the first metering pump 10 and allows the material conveyed and metered by the second metering pump 14 to flow into the premixer 74. Since viscous material is conveyed in this embodiment, the two components are premixed in the dynamic premixer 74.

Die Starttaste 246 betätigt das Startventil 248 und steht mit der pneumatischen Steuerung 226 in Verbindung, so daß die Antriebszylinder 17 und 18 gleichzeitig ihren Betrieb beginnen. In der Steuerung 226 werden die Dosierhübe der beiden Dosierpumpen 10 und 14 erkannt und derart gesteuert, daß gleichzeitig mit dem Befüllhub der ersten Dosierpumpe 10 das Öffnen des Dosierventils 50 erfolgt. Durch das Dosierventil 50 strömt die zweite Komponente in einem durch einen Doppelhub der zweiten Dosierpumpe 14 bestimmten Dosiervolumen. Dies wird von der pneumatischen Steuerung 226 erkannt. Nachdem das vorbestimmte Dosiervolumen der zweiten Komponente das Dosierventil 50 verlassen hat, schließt dieses und die zweite Dosierpumpe 14 stoppt, was durch die Anzeigevorrichtung 254 für das Dosierhubende angezeigt wird. Die Steuerung 226 erkennt auch die Stellung des 3/2-Wegeventils 222, was an der Anzeigevorrichtung 268 für das Dosierhubende des Arbeitszylinders 17 angezeigt wird. Sodann wird wiederum ein gleichzeitiger Beginn des nächsten Hubes der beiden Antriebszylinder 17 und 18 durch die Steuerung 226 ausgelöst.The start button 246 actuates the start valve 248 and is connected to the pneumatic control 226, so that the drive cylinders 17 and 18 start their operation at the same time. The control strokes 226 recognize the metering strokes of the two metering pumps 10 and 14 and control them such that the metering valve 50 is opened simultaneously with the filling stroke of the first metering pump 10. The second component flows through the metering valve 50 in a metering volume determined by a double stroke of the second metering pump 14. This is recognized by the pneumatic control 226. After the predetermined metering volume of the second component has left the metering valve 50, it closes and the second metering pump 14 stops, which is indicated by the display device 254 for the metering stroke end. The controller 226 also recognizes the position of the 3/2-way valve 222, which is indicated on the display device 268 for the end of the metering stroke of the working cylinder 17. Then a simultaneous start of the next stroke of the two drive cylinders 17 and 18 is triggered by the control 226.

Die Steuerung 226 ist so ausgelegt, daß sie das 5/3-Wegeventil 234 des Arbeitszylinders 18 zunächst in die sperrende Mittelstellung steuert, wenn das Hubende des Arbeitszylinders 17 noch nicht angezeigt wird. Das 5/3-Wegeventil 234 bleibt so lange in der mittleren Sperrstellung, bis auch der Arbeitszylinder 17 sein Hubende anzeigt. Erst dann steuert das 3/2-Wegeventil 222 und das 5/3-Wegeventil 234 wird so umgesteuert, daß die Arbeitszylinder 17 und 18 ihren entgegengesetzten Hub beginnen. Am entgegengesetzten Hubende erfolgt der entsprechende Steuerungsablauf, so daß auch der darauffolgende Hub von beiden Arbeitszylindern 17 und 18 gleichzeitig begonnen wird.The controller 226 is designed so that it first controls the 5/3-way valve 234 of the working cylinder 18 into the blocking central position when the stroke end of the working cylinder 17 is not yet displayed. The 5/3-way valve 234 remains in the middle blocking position until the working cylinder 17 also indicates its end of stroke. Only then does the 3/2-way valve 222 control and the 5/3-way valve 234 is reversed so that the working cylinders 17 and 18 begin their opposite stroke. The corresponding control sequence takes place at the opposite stroke end, so that the subsequent stroke of both working cylinders 17 and 18 is started simultaneously.

Claims (12)

  1. A device for metering and mixing two fluid constituents having a metering pump (10, 14) for each constituent, whereby the pressure side of the second (14) and where appropriate further metering pumps is/are connected via a delivery line (48) to the suction side of the first metering pump (10),
    characterised in that in each delivery line (48) is disposed a metering valve (50),
    in that the metering pumps (10, 14) are constructed as double-acting differential area piston pumps,
    in that a double-acting pneumatic cylinder (17, 18) is provided for each metering pump (10, 14), which at the drive side is connected to a pneumatic control means (226), whereby to reverse each of the cylinders (17, 18) there is provided a reversing valve (222, 234), which at the end of each metering stroke by the associated metering pump (10, 14) can be actuated by the pneumatic control means (226),
    and in that the reversing valve (234) of at least one metering pump (14) is constructed as a 5/3 spool valve and possesses a central position preventing the operation of the cylinder (18), whereby a reversal of the 5/3 spool valve and thus the next metering stroke of the metering pump (14) can only be initiated by the pneumatic control means (226) when all the metering pumps (10, 14) have reached the end of their metering stroke.
  2. A device according to Claim 1,
    characterised in that each metering valve (50) opens into a static and/or dynamic premixer (20, 74) connected in front of the first metering pump (10), the capacity of which is at least equal to a double-stroke volume of the first metering pump (10).
  3. A device according to Claim 1 or 2,
    characterised in that one or more static and/or dynamic mixers (38) are additionally connected between the metering valve (50) or the metering valves and an application device (42) for the mixed constituents.
  4. A device according to one of Claims 1 to 3,
    characterised in that the metering valve(s) (50) opens (open) flush into the first metering pump (10) and respectively an aforementioned mixer installed in front of it (20, 74).
  5. A device according to one of Claims 1 to 4,
    characterised in that the metering volume of the second metering pump (14) and, where applicable, further metering pumps is adjustable.
  6. A device according to one of the preceding Claims,
    characterised in that the stroke height of at least one metering pump (14) can be determined by adjustable roller-operated valves (68, 70) connected to the control means (226), which valves can be switched by an actuating block (72), which is attached at the piston rod (56) connecting the associated cylinder (18) to the respective metering pump (14).
  7. A device according to one of the preceding Claims,
    characterised in that a pneumatically controllable material pressure switch (176) is provided to monitor the supply of the respective constituent in the or each delivery line (48).
  8. A device according to one of the preceding Claims,
    characterised in that, for the individual control of the delivery of each constituent and for the overall control of the simultaneous delivery of all constituents, the pneumatic control means (226) are connected to a reversing valve (198), in which the number of positions and directions exceeds the number of constituents by one.
  9. A device according to one of the preceding Claims,
    characterised in that a suction pipe (140), which is in contact with an electric heating element (152), is provided to suck up a viscous constituent.
  10. A device according to Claim 9,
    characterised in that the heating element (152) is constructed as a strip heater automatically controlling its temperature.
  11. A device according to Claim 10,
    characterised in that the suction pipe (140) is embedded with the heating element (152) in an enveloping heat-conducting material (150), which is surrounded by a heat-conducting over-pipe (144).
  12. A device according to Claim 11,
    characterised in that the over-pipe (144) is surrounded at a concentric distance by a protective pipe (170) made from heat-insulating plastic, at which the suction pipe (140) is removably supported and which comprises at least one aperture (174) for the entry of the viscous constituent (100).
EP91114189A 1990-10-05 1991-08-23 Device for proportioning and mixing two fluid components Expired - Lifetime EP0478944B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4031649 1990-10-05
DE4031649A DE4031649C2 (en) 1990-10-05 1990-10-05 Dosing and mixing system
DE9107818U DE9107818U1 (en) 1991-06-25 1991-06-25
DE9107818U 1991-06-25

Publications (2)

Publication Number Publication Date
EP0478944A1 EP0478944A1 (en) 1992-04-08
EP0478944B1 true EP0478944B1 (en) 1994-05-18

Family

ID=25897494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91114189A Expired - Lifetime EP0478944B1 (en) 1990-10-05 1991-08-23 Device for proportioning and mixing two fluid components

Country Status (3)

Country Link
EP (1) EP0478944B1 (en)
AT (1) ATE105733T1 (en)
DE (1) DE59101664D1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5499745A (en) * 1994-02-18 1996-03-19 Nordson Corporation Apparatus for mixing and dispensing two chemically reactive materials
FI109104B (en) * 2000-10-13 2002-05-31 Corob Oy Dispenser for fluid
DE102014209155A1 (en) * 2014-05-14 2015-11-19 Wiwa Wilhelm Wagner Gmbh & Co Kg Method for operating a pump system and pump system
DE102014209157A1 (en) 2014-05-14 2015-11-19 Wiwa Wilhelm Wagner Gmbh & Co Kg Method for controlling a pump system and pump system
DE102014209159A1 (en) * 2014-05-14 2015-11-19 Wiwa Wilhelm Wagner Gmbh & Co Kg Method for controlling a pump system and pump system
CN106621883A (en) * 2016-12-28 2017-05-10 张晓燕 Portable type multi-component gas diluting device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB208800A (en) * 1922-09-28 1923-12-28 Fordyce Charles Jones A new or improved solution mixing and discharging machine or apparatus
FR1228608A (en) * 1958-10-06 1960-08-31 Medo Appara Tegesellschaft M B Hydraulically operated pump for metered injection of chemicals in solution in a pressurized liquid stream
US3129926A (en) * 1960-06-20 1964-04-21 Hudges Chemicals Company Device for mixing chemically reactive ingredients
DE2358569C2 (en) * 1973-11-24 1985-04-18 Philippe Latresne Cloup Device for dosing a liquid additive into a main amount of liquid
US4026439A (en) * 1975-06-18 1977-05-31 Cocks Eric H Precision fluid dispensing and mixing system

Also Published As

Publication number Publication date
DE59101664D1 (en) 1994-06-23
ATE105733T1 (en) 1994-06-15
EP0478944A1 (en) 1992-04-08

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