EP0729780B1 - Installation for mixing liquids with solid materials - Google Patents

Installation for mixing liquids with solid materials Download PDF

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Publication number
EP0729780B1
EP0729780B1 EP96102635A EP96102635A EP0729780B1 EP 0729780 B1 EP0729780 B1 EP 0729780B1 EP 96102635 A EP96102635 A EP 96102635A EP 96102635 A EP96102635 A EP 96102635A EP 0729780 B1 EP0729780 B1 EP 0729780B1
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EP
European Patent Office
Prior art keywords
mixing
installation according
liquid
inlet hopper
storage tank
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
EP96102635A
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German (de)
French (fr)
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EP0729780A3 (en
EP0729780A2 (en
Inventor
Norbert Dr. Stehr
Dieter März
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Draiswerke GmbH
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Draiswerke GmbH
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Filing date
Publication date
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Publication of EP0729780A2 publication Critical patent/EP0729780A2/en
Publication of EP0729780A3 publication Critical patent/EP0729780A3/en
Application granted granted Critical
Publication of EP0729780B1 publication Critical patent/EP0729780B1/en
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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
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/59—Mixing systems, i.e. flow charts or diagrams
    • 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
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B01F25/51—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is circulated through a set of tubes, e.g. with gradual introduction of a component into the circulating flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/25—Mixers with loose mixing elements, e.g. loose balls in a receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71775—Feed mechanisms characterised by the means for feeding the components to the mixer using helical screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/114—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections
    • B01F27/1143—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections screw-shaped, e.g. worms

Definitions

  • the invention relates to a system for mixing a predetermined amount Liquid with a given amount of powdered solid.
  • WO 92/21436 describes a device for wetting and dispersing of powdery solid in liquids known to have a disk-shaped Has rotor in a dispersion chamber. On one side of the disk-shaped rotor is an inlet for the powdery solid and on the other side of the disc-shaped rotor the inlet for the Liquid provided. The combination of the powdery solid with the liquid takes place in a wetting space in the outer edge area the rotor disc. On the outer edge of the surrounding the rotor disc Wetting chamber is an outlet for the liquid-powder mixture. The supply of the liquid and the powdery solid takes place by suction using the high-speed rotor disc.
  • the pulverulent solid can come from an over the device arranged funnel and / or by means of a hose a sack, storage container or the like. be sucked in. From the magazine S ⁇ FW Journal Cosmetics Detergents Specialties, April 2, 1992, pages 2 to 4 it has also become known for this known device, to connect the outlet of the device to the liquid reservoir, so that the liquid is circulated through the device is and the solid is thereby concentrated in the liquid.
  • the suction of the powdery solid is proportionate difficult and of numerous influencing factors, for example the flow behavior of the powdery solid.
  • the invention is therefore based on the object of a system of the generic type To create kind that is so operable that one hand Dust and, on the other hand, pronounced agglomerate formation as far as possible be avoided.
  • a system with a recycling feed is also known from US-A-4 099 005.
  • the essence of the invention is that a batch of powdered, dust-prone solid and a batch of liquid are brought together quasi-continuously in such a way that the Liquid circulates several times, many times, and the solid concentrated over these multiple circulations concentrated in the liquid becomes.
  • the solid is metered, inevitably supplied.
  • the Solid and liquid are brought together in the feed pipe, so that there is already a pre-mixing. This will make the Formation of larger agglomerates avoided.
  • By the way of feeding the Solid matter is prevented from dusting.
  • the system shown in FIG. 1 has a storage container 1 on which is sufficient to hold a predetermined amount of liquid 2 Volume.
  • a storage container 1 In the storage container 1 is one of one Not shown drive drivable agitator 3 arranged.
  • a screw mixing machine 4 is provided, the main of which cylindrical housing 5 of a temperature jacket 6 with a Inlet 7 and an outlet 8 for a temperature control medium for heating or Cool is surrounded.
  • a mixing shaft 9 is arranged in the housing 5 via an upstream transmission 10 from a mixed drive motor 11 is drivable.
  • a feed pipe opens into its interior 12 13 a.
  • the mixing shaft 9 as a worm shaft a helical circumferential screw flight 14 is formed.
  • the housing 5 can also be equipped with a so-called clearing wheel be provided, which meshes with the screw flights 14 to ensure proper Transport of the materials to be mixed through the interior 12 to ensure in the direction of conveyance 15.
  • clearing wheels are known for example from DE-A-24 32 860 (corresponding to US-A-3 957 210).
  • the screw mixer 4 can instead of a single shaft machine also designed as a double worm machine with a clearing wheel be, which by its genre is inevitably promoting.
  • Mixing shaft 9 is followed by an intensive mixing section 17 in which the Mixing shaft 9 with short pin-like or strip-like mixing tools 18 is occupied, which attached to the inner wall 19 of the housing 5 Counter tools 20 are assigned.
  • the mixing tools 18 and the counter tools 20 are in alternating circles around the Center axis 21 of the mixing shaft 9 is arranged. The closer the distance to the Mixing tools 18 from adjacent in the direction of the central axis 21 Counter tools 20, the greater the dispersing effect.
  • a return conveyor 22 is provided, which is attached to the end of the mixing shaft 9
  • Pump feed wheel 23 includes the liquid 2 in a Conveys outlet channel 24 opening tangentially from the housing 5.
  • the Outlet channel 24 is connected to reservoir 1 via a return line 25 connected. If the mixing machine 4 is located directly above the storage container 1 is arranged, then naturally no return conveyor must be provided his.
  • the feed connector 13 consists of a lower flange flanged to the housing 5 and in the interior 12 opening, widening upwards funnel-shaped section 26 and an upper, approximately cylindrical Section 27.
  • a solid feed pipe 28 protrudes concentrically from above, into the free-flowing, powdery solids from at least one solids metering device 29 can be entered. These solids leak out a lower outlet opening 30 of the feed pipe 28 into the funnel-shaped Section 26 of the supply nozzle 13.
  • Slightly above this lower one Outlet opening 30 is a cylindrical section 27 of the feed connector 13 surrounding ring line 31 is provided, which by a Cross-section approximately C-shaped jacket 32 is formed with a ring shape.
  • the way bounded annular space 33 of the ring line 31 is connected to a liquid supply line 34 connected, which leads to the reservoir 1.
  • a liquid passage opening 35 is formed, for example in the form an adjustable gap. From the annular space 33 flows by means of a Pump 36 fed from the reservoir 1 through the feed line 34 Liquid 2 through the passage openings 35 into the cylindrical Section 27 of the feed connector 13. It runs there on the inner wall 37 of the cylindrical section 27 down into the funnel-shaped Section 26. The downward flowing solid 38 is thereby from the liquid 2 running off on the inner wall 37 is completely enveloped.
  • the Liquid 2 is the mixing machine 4 in the feed pipe 13 below Gravity fed.
  • the solids metering device 29 has a funnel 40 which either has a volume that holds the entire batch of solid 38 is sufficient or the predetermined amount of solid is fed continuously during a complete mixing cycle. To the Dosing accuracy of the solid dosing device 29 is not special high demands. The dosing device only has to do so be adjustable so that they the predetermined amount of powdered solid distributed over a predetermined period of time in the feed connector 13 enters.
  • the metering device 29 can be a volumetric pump Snail or a gravimetric conveying snail or a gravimetric have conveying belt conveyor. In the simplest and sufficient Execution is a volumetric conveying screw. Such metering devices are known and commercially available. Basically it is also sufficient if a setpoint is to be given for the unit of time Solid volume is adjustable.
  • a level measuring device is arranged, which is a non-contact has working level probe 41.
  • This probe 41 gives continuously fill level signals to an input 42 of a control device 43.
  • These signals are processed in the control device 43 in such a way that a minimum level 44 and a maximum level 45 corresponding control signal is generated, which via outputs 46, 47 for alternative or cumulative control of the drive motor 11 the mixing shaft 9 and / or a pump drive motor 48 is supplied.
  • the probe 41 reports that the minimum fill level 44 has not been reached, then either by controlling the drive motor 11, the speed the mixing shaft 9 and thus the throughput of the mixing machine 4 lowered or the speed of the drive motor 48 of the pump 36 and thus their output increases.
  • the probe 41 exceeded of the maximum fill level 45 in the feed pipe 13 reports, then is either the speed of the drive motor 11 and thus the throughput the mixer 4 increases or the speed of the drive motor 48 of the pump 36 and thus the fluid supply lowered.
  • Both Measures can also be taken at the same time.
  • V Blender V Solid + V Mixture'
  • V solid and V mixture denote the volume flow of solid and the volume flow of mixture of solid and liquid.
  • the throttle 51 is connected to an output 53 of the control device 43.
  • the throttle 51 is controlled at a predetermined high relining of the mixing machine 4 so that the minimum fill level 44 is not fallen below and the maximum fill level 45 is not exceeded, the pressure gauge 52 being used to monitor that a maximum permissible pressure in the System is not exceeded.
  • the setting is such that with a complete circulation the liquid 2 located in the storage container 1 by the mixing machine 4 and back to the reservoir 1 only a fraction of that Solid 38 to be added to liquid 2 is added.
  • the type of Solid 38 and liquid 2 and the desired homogeneity can two to ten rounds of liquid 2 until complete addition solids 38 may be appropriate. If a fineness of dispersion of Mixture is sought, then in many cases more than ten rounds required.
  • the term liquid also means the mixture formed during the circulation Liquid 2 and solids 38 comprises. A pure liquid 2 is only present at the beginning of the process. This is - as described - with Mixed solids 38 and thus forms a flowable liquid-solid mixture, which is also called liquid for the sake of simplicity becomes.
  • the agitator 3 in the storage container 1 is used in the storage container 1 to bring about a concentration balance, that is, for an even one Concentration of solid 38 in liquid 2 in the entire reservoir 1 to worry.
  • An eccentric screw pump or a can also be used as the mixing machine 4 standard mixers equipped with conveyors are used. It is essential that it has its own funding, ie the liquid 2 and the solid 38 gives a delivery pulse.
  • Such agitators 3 ' are known; for example, so-called spiral agitators, which in particular also has a pronounced pull-in effect in the area exert the surface of the liquid 2 on the latter.
  • the reservoir 1 ' is provided with a cover 54, in which a vent opening 55, is provided for example for a pendulum ventilation.
  • the feed connector 13 in the embodiment described in FIG. 1 is in the Lid 54 attached and ends above the liquid 2. It is so far arranged above the liquid 2 that he even after complete mixing of the entire solid 38 in the liquid 2 not in this Mixture immersed.
  • An operating device 56 is also provided, by means of which on the one hand, the delivery rate of the pump 36 by appropriate setting the speed of the pump drive motor 48 and on the other hand the Dosing capacity of the metering device 29 can be set.
  • the delivery rate of the pump 36 by appropriate setting the speed of the pump drive motor 48 and on the other hand the Dosing capacity of the metering device 29 can be set.
  • the mixing of liquid 2 and solid 38 takes place in this Connection only in the storage container 1 'by its Agitator 3 '; there is no dispersion here. For many Adequate mixing can, however, be used in applications become.
  • an agitator drive motor 57 the function of a mixed drive motor, which by means of a V-belt drive 58, the agitator shaft 59 of the mixer shaft Agitator 3 'drives.
  • the reservoir 1 'with agitator 3' is used for 2 not only as a storage container, but also as a mixing device.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Accessories For Mixers (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Description

Die Erfindung betrifft eine Anlage zum Mischen einer vorgegebenen Menge Flüssigkeit mit einer vorgegebenen Menge pulverförmigem Feststoff.The invention relates to a system for mixing a predetermined amount Liquid with a given amount of powdered solid.

In der Praxis, beispielsweise in der Farbenindustrie, taucht immer wieder das Problem auf, eine vorgegebene Menge Flüssigkeit mit einer vorgegebenen Menge pulverförmigem, zum Stauben neigendem Feststoff, in der Regel Pigment, staubfrei vorzumischen. Derartige Gemische werden anschließend in der Regel in Rührwerksmühlen gemahlen und dispergiert. Wenn es sich um die Zugabe von Pigment zu Flüssigkeit handelt, wird in der nachfolgenden Rührwerksmühle Farbe bzw. Lack hergestellt. Das Problem eines staubfreien Mischens von solchen Feststoffen und Flüssigkeiten wurde in der Praxis bisher nicht zufriedenstellend gelöst. Es kommt hinzu, daß beim gleichzeitigen Zusammenführen der gesamten Chargen, also der gesamten vorgegebenen Menge an Flüssigkeit und der gesamten vorgegebenen Menge an pulverförmigem Feststoff, in der Regel auch starke Agglomeratbildungen auftreten, die wiederum den nachfolgenden Mahl- und Dispergierprozeß erschweren bzw. aufwendiger machen. Die Begriffe "Flüssigkeit" und "Feststoff" umfassen in dieser Anmeldung auch jeweils deren Mehrzahl.In practice, for example in the paint industry, diving occurs again and again the problem is a given amount of liquid with a given Amount of powdery, dust-prone solid, usually Pigment, premixed dust-free. Such mixtures are then usually ground and dispersed in agitator mills. If it is the addition of pigment to liquid is discussed in the following Agitator mill paint or varnish produced. The problem of one dust-free mixing of such solids and liquids has been found in not yet satisfactorily solved in practice. In addition, while merging the entire batches, i.e. the entire batch predetermined amount of liquid and the total predetermined Amount of powdery solid, usually also strong agglomerates occur, which in turn the subsequent grinding and dispersing process complicate or make more complex. The terms "liquid" and "solid" in this application also include the majority thereof.

Aus WO 92/21436 ist eine Vorrichtung zum Benetzen und Dispergieren von pulverförmigem Feststoff in Flüssigkeiten bekannt, die einen scheibenförmigen Rotor in einer Dispergierkammer aufweist. Auf einer Seite des scheibenförmigen Rotors ist ein Einlaß für den pulverförmigen Feststoff und auf der anderen Seite des scheibenförmigen Rotors der Einlaß für die Flüssigkeit vorgesehen. Die Zusammenführung des pulverförmigen Feststoffes mit der Flüssigkeit erfolgt in einem Benetzungsraum im äußeren Randbereich der Rotorscheibe. Am äußeren Rand der die Rotorscheibe umgebenden Benetzungskammer befindet sich ein Auslaß für das Flüssigkeits-Pulver-Gemisch. Die Zuführung der Flüssigkeit und des pulverförmigen Feststoffes erfolgt durch Ansaugen mittels der hochtourig angetriebenen Rotorscheibe. Der pulverförmige Feststoff kann hierbei aus einem über der Vorrichtung angeordneten Trichter und/oder mittels eines Schlauches aus einem Sack, Vorratsbehälter od.dgl. angesaugt werden. Aus der Zeitschrift SÖFW Journal Cosmetics Detergents Specialities, 2. Aprilheft 1992, Seiten 2 bis 4 ist es für diese bekannte Vorrichtung weiterhin bekannt geworden, den Auslaß der Vorrichtung mit dem Flüssigkeits-Vorratsbehälter zu verbinden, so daß die Flüssigkeit im Kreis durch die Vorrichtung geführt wird und der Feststoff hierbei in der Flüssigkeit aufkonzentriert wird. Das Ansaugen des pulverförmigen Feststoffes ist hierbei verhältnismäßig schwierig und von zahlreichen Einflußgrößen, beispielsweise dem Fließverhalten des pulverförmigen Feststoffes abhängig.WO 92/21436 describes a device for wetting and dispersing of powdery solid in liquids known to have a disk-shaped Has rotor in a dispersion chamber. On one side of the disk-shaped rotor is an inlet for the powdery solid and on the other side of the disc-shaped rotor the inlet for the Liquid provided. The combination of the powdery solid with the liquid takes place in a wetting space in the outer edge area the rotor disc. On the outer edge of the surrounding the rotor disc Wetting chamber is an outlet for the liquid-powder mixture. The supply of the liquid and the powdery solid takes place by suction using the high-speed rotor disc. The pulverulent solid can come from an over the device arranged funnel and / or by means of a hose a sack, storage container or the like. be sucked in. From the magazine SÖFW Journal Cosmetics Detergents Specialties, April 2, 1992, pages 2 to 4 it has also become known for this known device, to connect the outlet of the device to the liquid reservoir, so that the liquid is circulated through the device is and the solid is thereby concentrated in the liquid. The suction of the powdery solid is proportionate difficult and of numerous influencing factors, for example the flow behavior of the powdery solid.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Anlage der gattungsgemäßen Art zu schaffen, die so betreibbar ist, daß einerseits ein Stauben und andererseits ausgeprägte Agglomeratbildungen weitestgehend vermieden werden. Ein solches System mit einer Recycling-Zufuhr ist auch aus der US-A-4 099 005 bekannt.The invention is therefore based on the object of a system of the generic type To create kind that is so operable that one hand Dust and, on the other hand, pronounced agglomerate formation as far as possible be avoided. Such a system with a recycling feed is also known from US-A-4 099 005.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruches 1 gelöst. Der Kern der Erfindung liegt darin, daß eine Charge pulverförmigen, zum Stauben neigenden Feststoffes und eine Charge Flüssigkeit quasi-kontinuierlich in der Weise zusammengebracht werden, daß die Flüssigkeit mehrfach, und zwar vielfach umläuft und hierbei der Feststoff über diese vielfachen Umläufe verteilt in der Flüssigkeit aufkonzentriert wird. Der Feststoff wird hierbei dosiert, also zwangsläufig zugeführt. Die Zusammenführung von Feststoff und Flüssigkeit erfolgt im Zuführstutzen, so daß dort bereits eine Vorvermengung stattfindet. Hierdurch wird die Bildung größerer Agglomerate vermieden. Durch die Art der Zuführung des Feststoffes wird ein Stauben unterbunden. This object is achieved by the features of claim 1 solved. The essence of the invention is that a batch of powdered, dust-prone solid and a batch of liquid are brought together quasi-continuously in such a way that the Liquid circulates several times, many times, and the solid concentrated over these multiple circulations concentrated in the liquid becomes. The solid is metered, inevitably supplied. The Solid and liquid are brought together in the feed pipe, so that there is already a pre-mixing. This will make the Formation of larger agglomerates avoided. By the way of feeding the Solid matter is prevented from dusting.

Zahlreiche vorteilhafte und zum Teil erfinderische Ausgestaltungen ergeben sich aus den Unteransprüchen.Numerous advantageous and partially inventive configurations result itself from the subclaims.

Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung zweier Ausführungsbeispiele anhand der Zeichnungen. Es zeigt

Fig. 1
eine Anlage zum Mischen von Flüssigkeit und Feststoff mit einem Vorratsbehälter, einer hiervon gesonderten Mischeinrichtung und einem Zuführstutzen mit Dosiereinrichtung und
Fig. 2
eine weitere Ausführungsform einer Anlage zum Mischen von Flüssigkeit mit Feststoff mit einem als Mischeinrichtung dienenden Vorratsbehälter und einem in den Vorratsbehälter mündenden Zuführstutzen mit Flüssigkeitszuführung und vorgeordneter Feststoff-Dosiereinrichtung.
Details of the invention result from the following description of two exemplary embodiments with reference to the drawings. It shows
Fig. 1
a system for mixing liquid and solid with a storage container, a separate mixing device and a feed nozzle with metering device and
Fig. 2
a further embodiment of a system for mixing liquid with solid with a storage container serving as a mixing device and a supply nozzle opening into the storage container with liquid supply and an upstream solid dosing device.

Die in Fig. 1 dargestellte Anlage weist einen Vorratsbehälter 1 auf, der ein zur Aufnahme einer vorgegebenen Menge Flüssigkeit 2 ausreichendes Volumen aufweist. In dem Vorratsbehälter 1 ist ein von einem nicht dargestellten Antrieb antreibbares Rührwerk 3 angeordnet.The system shown in FIG. 1 has a storage container 1 on which is sufficient to hold a predetermined amount of liquid 2 Volume. In the storage container 1 is one of one Not shown drive drivable agitator 3 arranged.

Weiterhin ist eine Schnecken-Mischmaschine 4 vorgesehen, deren im wesentlichen zylindrisches Gehäuse 5 von einem Temperiermantel 6 mit einem Einlaß 7 und einem Auslaß 8 für ein Temperiermedium zum Heizen oder Kühlen umgeben ist. Im Gehäuse 5 ist eine Mischwelle 9 angeordnet, die über ein vorgeordnetes Getriebe 10 von einem Misch-Antriebsmotor 11 antreibbar ist.Furthermore, a screw mixing machine 4 is provided, the main of which cylindrical housing 5 of a temperature jacket 6 with a Inlet 7 and an outlet 8 for a temperature control medium for heating or Cool is surrounded. A mixing shaft 9 is arranged in the housing 5 via an upstream transmission 10 from a mixed drive motor 11 is drivable.

An einem Ende des Gehäuses 5 mündet in dessen Innenraum 12 ein Zuführstutzen 13 ein. Im Bereich des Zuführstutzens 13 und über einen erheblichen Teil des Gehäuses 5 ist die Mischwelle 9 als Schneckenwelle mit einem schraubenlinienförmig umlaufenden Schneckensteg 14 ausgebildet. In diesem Bereich kann das Gehäuse 5 auch mit einem sogenannten Räumrad versehen sein, das mit den Schneckenstegen 14 kämmt, um einen ordnungsgemäßen Transport der zu mischenden Materialien durch den Innenraum 12 in Förderrichtung 15 zu gewährleisten. Derartige Räumräder sind bekannt, und zwar beispielsweise aus der DE-A-24 32 860 (entsprechend US-A-3 957 210). Die Schnecken-Mischmaschine 4 kann anstelle einer Einwellenmaschine mit Räumrad auch als Doppel-Schneckenmaschine ausgebildet sein, die von ihrer Gattung her zwangsweise fördernd ist.At one end of the housing 5, a feed pipe opens into its interior 12 13 a. In the area of the feed connector 13 and over a considerable Part of the housing 5 is the mixing shaft 9 as a worm shaft a helical circumferential screw flight 14 is formed. In In this area, the housing 5 can also be equipped with a so-called clearing wheel be provided, which meshes with the screw flights 14 to ensure proper Transport of the materials to be mixed through the interior 12 to ensure in the direction of conveyance 15. Such clearing wheels are known for example from DE-A-24 32 860 (corresponding to US-A-3 957 210). The screw mixer 4 can instead of a single shaft machine also designed as a double worm machine with a clearing wheel be, which by its genre is inevitably promoting.

An den mit einem Schneckensteg 14 versehenen Schneckenabschnitt 16 der Mischwelle 9 schließt sich ein Intensiv-Mischabschnitt 17 an, in dem die Mischwelle 9 mit kurzen zapfen- oder leistenartigen Mischwerkzeugen 18 besetzt ist, denen an der Innenwand 19 des Gehäuses 5 angebrachte Gegenwerkzeuge 20 zugeordnet sind. Die Mischwerkzeuge 18 und die Gegenwerkzeuge 20 sind jeweils auf einander abwechselnden Kreisen um die Mittelachse 21 der Mischwelle 9 angeordnet. Je geringer der Abstand der Mischwerkzeuge 18 von in Richtung der Mittelachse 21 benachbarten Gegenwerkzeugen 20 ist, umso größer ist die Dispergierwirkung.At the screw section 16 provided with a screw web 14 Mixing shaft 9 is followed by an intensive mixing section 17 in which the Mixing shaft 9 with short pin-like or strip-like mixing tools 18 is occupied, which attached to the inner wall 19 of the housing 5 Counter tools 20 are assigned. The mixing tools 18 and the counter tools 20 are in alternating circles around the Center axis 21 of the mixing shaft 9 is arranged. The closer the distance to the Mixing tools 18 from adjacent in the direction of the central axis 21 Counter tools 20, the greater the dispersing effect.

Am in Förderrichtung 15 hinteren Ende des Gehäuses 5 ist eine Rückfördereinrichtung 22 vorgesehen, die ein am Ende der Mischwelle 9 angebrachtes Pumpen-Förderrad 23 umfaßt, das die Flüssigkeit 2 in einen tangential aus dem Gehäuse 5 ausmündenden Auslaßkanal 24 fördert. Der Auslaßkanal 24 ist über eine Rücklaufleitung 25 mit dem Vorratsbehälter 1 verbunden. Wenn die Mischmaschine 4 direkt über dem Vorratsbehälter 1 angeordnet wird, dann muß naturgemäß keine Rückfördereinrichtung vorgesehen sein.At the rear end of the housing 5 in the conveying direction 15 there is a return conveyor 22 is provided, which is attached to the end of the mixing shaft 9 Pump feed wheel 23 includes the liquid 2 in a Conveys outlet channel 24 opening tangentially from the housing 5. The Outlet channel 24 is connected to reservoir 1 via a return line 25 connected. If the mixing machine 4 is located directly above the storage container 1 is arranged, then naturally no return conveyor must be provided his.

Der Zuführstutzen 13 besteht aus einem unteren, am Gehäuse 5 angeflanschten und in dessen Innenraum 12 mündenden, sich nach oben erweiternden trichterförmigen Abschnitt 26 und einem oberen, etwa zylindrischen Abschnitt 27. In den oberen zylindrischen Abschnitt 27 des Zuführstutzens 13 ragt von oben ein Feststoff-Zuführrohr 28 konzentrisch hinein, in das rieselfähige, pulverförmige Feststoffe aus mindestens einer Feststoff-Dosiereinrichtung 29 eingegeben werden. Diese Feststoffe treten aus einer unteren Austrittsöffnung 30 des Zuführrohres 28 in den trichterförmigen Abschnitt 26 des Zuführstutzens 13. Etwas oberhalb dieser unteren Austrittsöffnung 30 ist eine den zylindrischen Abschnitt 27 des Zuführstutzens 13 umgebende Ringleitung 31 vorgesehen, die durch einen im Querschnitt etwa C-förmigen Mantel 32 mit Ringform gebildet wird. Der so umgrenzte Ringraum 33 der Ringleitung 31 ist an eine Flüssigkeits-Zuführleitung 34 angeschlossen, die zum Vorratsbehälter 1 führt. In der Wand des zylindrischen Abschnitts 27 des Zuführstutzens 13 ist mindestens eine Flüssigkeits-Durchtrittsöffnung 35 ausgebildet, beispielsweise in Form eines einstellbaren Spaltes. Aus dem Ringraum 33 strömt mittels einer Pumpe 36 vom Vorratsbehälter 1 durch die Zuführleitung 34 zugeförderte Flüssigkeit 2 durch die Durchtrittsöffnungen 35 hindurch in den zylindrischen Abschnitt 27 des Zuführstutzens 13. Sie läuft dort an der Innenwand 37 des zylindrischen Abschnitts 27 hinab in den trichterförmigen Abschnitt 26. Der nach unten fließende Feststoff 38 wird hierbei von der an der Innenwand 37 ablaufenden Flüssigkeit 2 völlig eingehüllt. Die Flüssigkeit 2 wird der Mischmaschine 4 im Zuführstutzen 13 also unter Schwerkraft zugeführt. Sie dient gleichermaßen als Transportmedium für den ebenfalls unter Schwerkraft zugeführten Feststoff 38. Im Zuführstutzen 13 findet also bereits eine gewisse Vorvermengung von Flüssigkeit 2 und Feststoff 38 statt. Diese Ausgestaltung eines Zuführstutzens 13 zum Zuführen von Feststoff und Flüssigkeit in eine Behandlungsmaschine ist für sich bekannt, und zwar aus der DE-A-30 18 729 (entsprechend US-A-4 394 980).The feed connector 13 consists of a lower flange flanged to the housing 5 and in the interior 12 opening, widening upwards funnel-shaped section 26 and an upper, approximately cylindrical Section 27. In the upper cylindrical section 27 of the feed port 13, a solid feed pipe 28 protrudes concentrically from above, into the free-flowing, powdery solids from at least one solids metering device 29 can be entered. These solids leak out a lower outlet opening 30 of the feed pipe 28 into the funnel-shaped Section 26 of the supply nozzle 13. Slightly above this lower one Outlet opening 30 is a cylindrical section 27 of the feed connector 13 surrounding ring line 31 is provided, which by a Cross-section approximately C-shaped jacket 32 is formed with a ring shape. The way bounded annular space 33 of the ring line 31 is connected to a liquid supply line 34 connected, which leads to the reservoir 1. In the Wall of the cylindrical portion 27 of the feed connector 13 is at least a liquid passage opening 35 is formed, for example in the form an adjustable gap. From the annular space 33 flows by means of a Pump 36 fed from the reservoir 1 through the feed line 34 Liquid 2 through the passage openings 35 into the cylindrical Section 27 of the feed connector 13. It runs there on the inner wall 37 of the cylindrical section 27 down into the funnel-shaped Section 26. The downward flowing solid 38 is thereby from the liquid 2 running off on the inner wall 37 is completely enveloped. The Liquid 2 is the mixing machine 4 in the feed pipe 13 below Gravity fed. It also serves as a transport medium for the solid 38, which is also fed under gravity. In the feed pipe 13 thus already finds a certain pre-mixing of liquid 2 and Solid 38 instead. This configuration of a feed nozzle 13 for feeding of solid and liquid in a treatment machine is for is known from DE-A-30 18 729 (corresponding to US-A-4 394 980).

Die Feststoff-Dosiereinrichtung 29 weist einen Trichter 40 auf, der entweder ein Volumen hat, das zur Aufnahme der gesamten Charge von Feststoff 38 ausreichend ist oder dem die vorgegebene Menge an Feststoff während eines kompletten Mischzyklus fortlaufend zugeführt wird. An die Dosiergenauigkeit der Feststoff-Dosiereinrichtung 29 werden keine besonders hohen Anforderungen gestellt. Die Dosiereinrichtung muß lediglich so einstellbar sein, daß sie die vorgegebene Menge an pulverförmigem Feststoff über einen vorgegebenen Zeitraum verteilt in den Zuführstutzen 13 eingibt. Die Dosiereinrichtung 29 kann eine volumetrisch fördernde Schnecke oder eine gravimetrisch fördernde Schnecke oder einen gravimetrisch fördernden Bandförderer aufweisen. In der einfachsten und ausreichenden Ausführung ist eine volumetrisch fördernde Schnecke vorgesehen. Derartige Dosiereinrichtungen sind bekannt und handelsüblich. Im Prinzip reicht es auch, wenn ein Sollwert für das pro Zeiteinheit abzugebende Feststoff-Volumen einstellbar ist. The solids metering device 29 has a funnel 40 which either has a volume that holds the entire batch of solid 38 is sufficient or the predetermined amount of solid is fed continuously during a complete mixing cycle. To the Dosing accuracy of the solid dosing device 29 is not special high demands. The dosing device only has to do so be adjustable so that they the predetermined amount of powdered solid distributed over a predetermined period of time in the feed connector 13 enters. The metering device 29 can be a volumetric pump Snail or a gravimetric conveying snail or a gravimetric have conveying belt conveyor. In the simplest and sufficient Execution is a volumetric conveying screw. Such metering devices are known and commercially available. Basically it is also sufficient if a setpoint is to be given for the unit of time Solid volume is adjustable.

Wenn zuverlässig vermieden werden soll, daß bei der Zugabe von Feststoff 38 und Flüssigkeit 2 Luft mit in die Mischmaschine 4 eingezogen wird, dann muß die Schnecken-Mischmaschine 4 immer vollständig gefüllt sein. Um dies zu ermöglichen, ist im trichterförmigen Abschnitt 26 des Zuführstutzens 13 eine Füllstands-Meßeinrichtung angeordnet, die eine berührungslos arbeitende Füllstands-Sonde 41 aufweist. Diese Sonde 41 gibt fortlaufend Füllstandssignale auf einen Eingang 42 einer Regeleinrichtung 43. In der Regeleinrichtung 43 werden diese Signale in der Weise verarbeitet, daß ein einem Minimal-Füllstand 44 und ein einem Maximal-Füllstand 45 entsprechendes Steuersignal erzeugt wird, das über Ausgänge 46, 47 zur alternativen oder kumulativen Ansteuerung dem Antriebsmotor 11 der Mischwelle 9 und/oder einem Pumpen-Antriebsmotor 48 zugeführt wird. Wenn die Sonde 41 ein Unterschreiten des Minimal-Füllstandes 44 meldet, dann wird entweder durch Ansteuerung des Antriebsmotors 11 die Drehzahl der Mischwelle 9 und damit die Durchsatzleistung der Mischmaschine 4 abgesenkt oder die Drehzahl des Antriebsmotors 48 der Pumpe 36 und damit deren Förderleistung erhöht. Wenn dagegen die Sonde 41 ein Überschreiten des Maximal-Füllstandes 45 im Zuführstutzen 13 meldet, dann wird entweder die Drehzahl des Antriebsmotors 11 und damit die Durchsatzleistung der Mischmaschine 4 erhöht oder die Drehzahl des Antriebsmotors 48 der Pumpe 36 und damit die Flüssigkeitszufuhr abgesenkt. Beide Maßnahmen können jeweils auch gleichzeitig ergriffen werden. Grundsätzlich ist es auch möglich, über einen Ausgang 49 der Regeleinrichtung 43 den Antrieb 50 der Feststoff-Dosiereinrichtung 29 in der Weise anzusteuern, daß bei einer Absenkung des Flüssigkeitsdurchsatzes auch die Feststoffzufuhr reduziert wird und umgekehrt. Im übrigen wird der vorstehend erwähnte Sollwert für das dem Zuführstutzen 13 von der Dosiereinrichtung 29 zuzuführende Volumen oder die entsprechende Menge an Feststoff 38 ebenfalls in der Regeleinrichtung 43 eingestellt.If you want to reliably avoid that when adding solid 38 and liquid 2 air is drawn into the mixing machine 4, then the screw mixer 4 must always be completely filled. To make this possible, is in the funnel-shaped section 26 of the feed nozzle 13 a level measuring device is arranged, which is a non-contact has working level probe 41. This probe 41 gives continuously fill level signals to an input 42 of a control device 43. These signals are processed in the control device 43 in such a way that a minimum level 44 and a maximum level 45 corresponding control signal is generated, which via outputs 46, 47 for alternative or cumulative control of the drive motor 11 the mixing shaft 9 and / or a pump drive motor 48 is supplied. If the probe 41 reports that the minimum fill level 44 has not been reached, then either by controlling the drive motor 11, the speed the mixing shaft 9 and thus the throughput of the mixing machine 4 lowered or the speed of the drive motor 48 of the pump 36 and thus their output increases. On the other hand, if the probe 41 exceeded of the maximum fill level 45 in the feed pipe 13 reports, then is either the speed of the drive motor 11 and thus the throughput the mixer 4 increases or the speed of the drive motor 48 of the pump 36 and thus the fluid supply lowered. Both Measures can also be taken at the same time. Basically it is also possible to use an output 49 of the control device 43 to control the drive 50 of the solids metering device 29 in such a way that with a reduction in the liquid flow rate also the Solids supply is reduced and vice versa. Otherwise, the above mentioned setpoint for the feed pipe 13 from the metering device 29 volume to be supplied or the corresponding amount Solid 38 also set in the control device 43.

Grundsätzlich ist es auch möglich, die Mischmaschine 4 mit Unterfütterung zu betreiben, d.h. ihr wird weniger Flüssigkeit 2 und weniger Feststoff 38 zugeführt, als ihrem Fördervermögen VMischmaschine entspricht. In diesem Fall gilt also VMischmaschine > VFeststoff + VGemisch' wobei VFeststoff und VGemisch den Volumenstrom an Feststoff und den Volumenstrom an Gemisch aus Feststoff und Flüssigkeit bezeichnen. Wenn die Mischmaschine 4 in der zuvor geschilderten Weise mit vollständiger Füllung arbeitet, dann gilt VMischmaschine = VFeststoff + VGemisch. In dem zuletzt angesprochenen Fall, bei dem gilt VMischmaschine > VFeststoff + VGemisch' kann eine vollständige Füllung der Mischmaschine 4 dadurch erreicht werden, daß über die Rücklaufleitung 25 ein Rückstau auf die Mischmaschine 4 ausgeübt wird. Hierzu ist in der Rücklaufleitung 25 eine einstellbare Drossel 51 mit einem zugeordneten Manometer 52 vorgesehen. Die Drossel 51 ist auf einen Ausgang 53 der Regeleinrichtung 43 geschaltet. In diesem Fall wird bei vorgegebener hoher Unterfütterung der Mischmaschine 4 die Drossel 51 so gesteuert, daß der Minimal-Füllstand 44 nicht unterschritten und der Maximal-Füllstand 45 nicht überschritten wird, wobei das Manometer 52 dazu dient zu überwachen, daß ein maximal zulässiger Druck im System nicht überschritten wird.In principle, it is also possible to operate the mixing machine 4 with relining, ie less liquid 2 and less solid 38 are fed to it than its conveying capacity V corresponds to the mixing machine . So in this case V Blender > V Solid + V Mixture' where V solid and V mixture denote the volume flow of solid and the volume flow of mixture of solid and liquid. If the mixing machine 4 works in the manner described above with complete filling, then the following applies V Blender = V Solid + V mixture . In the last case, where applies V Blender > V Solid + V Mixture' A complete filling of the mixing machine 4 can be achieved by exerting a back pressure on the mixing machine 4 via the return line 25. For this purpose, an adjustable throttle 51 with an associated manometer 52 is provided in the return line 25. The throttle 51 is connected to an output 53 of the control device 43. In this case, the throttle 51 is controlled at a predetermined high relining of the mixing machine 4 so that the minimum fill level 44 is not fallen below and the maximum fill level 45 is not exceeded, the pressure gauge 52 being used to monitor that a maximum permissible pressure in the System is not exceeded.

Grundsätzlich ist die Einstellung derart, daß bei einem vollständigen Umlauf der im Vorratsbehälter 1 befindlichen Flüssigkeit 2 durch die Mischmaschine 4 und zurück zum Vorratsbehälter 1 nur ein Bruchteil des der Flüssigkeit 2 zuzugebenden Feststoffes 38 zugegeben wird. Je nach Art des Feststoffes 38 und der Flüssigkeit 2 und der erwünschten Homogenität können zwei bis zehn Umläufe der Flüssigkeit 2 bis zur vollständigen Zugabe der Feststoffe 38 angemessen sein. Wenn eine Dispergierfeinheit des Gemisches angestrebt wird, dann sind in vielen Fällen auch mehr als zehn Umläufe erforderlich. Es sei an dieser Stelle hinzugefügt, daß der Begriff Flüssigkeit auch das während der Umläufe gebildete Gemisch aus Flüssigkeit 2 und Feststoffen 38 umfaßt. Eine reine Flüssigkeit 2 ist nur am Anfang des Prozesses vorhanden. Diese wird - wie geschildert - mit Feststoffen 38 gemischt und bildet somit ein fließfähiges Flüssigkeits-Feststoff-Gemisch, das der Einfachheit halber auch als Flüssigkeit bezeichnet wird. Basically, the setting is such that with a complete circulation the liquid 2 located in the storage container 1 by the mixing machine 4 and back to the reservoir 1 only a fraction of that Solid 38 to be added to liquid 2 is added. Depending on the type of Solid 38 and liquid 2 and the desired homogeneity can two to ten rounds of liquid 2 until complete addition solids 38 may be appropriate. If a fineness of dispersion of Mixture is sought, then in many cases more than ten rounds required. At this point it should be added that the The term liquid also means the mixture formed during the circulation Liquid 2 and solids 38 comprises. A pure liquid 2 is only present at the beginning of the process. This is - as described - with Mixed solids 38 and thus forms a flowable liquid-solid mixture, which is also called liquid for the sake of simplicity becomes.

Wenn von Flüssigkeitsmengen geredet wird, so kann es sich hierbei sowohl um Volumina als auch um Gewichtsmengen handeln. Gleiches gilt hinsichtlich der Feststoffe 38.When talking about amounts of liquid, it can be both are volumes as well as quantities by weight. The same applies to of solids 38.

Das Rührwerk 3 im Vorratsbehälter 1 dient dazu, im Vorratsbehälter 1 einen Konzentrationsausgleich herbeizuführen, also für eine gleichmäßige Konzentration von Feststoff 38 in Flüssigkeit 2 im gesamten Vorratsbehälter 1 zu sorgen.The agitator 3 in the storage container 1 is used in the storage container 1 to bring about a concentration balance, that is, for an even one Concentration of solid 38 in liquid 2 in the entire reservoir 1 to worry.

Als Mischmaschine 4 kann auch eine Exzenterschneckenpumpe oder ein gängiger mit Fördereinrichtungen versehener Mischer eingesetzt werden. Wesentlich ist, daß er eine Eigenförderung aufweist, also der Flüssigkeit 2 und dem Feststoff 38 einen Förderimpuls gibt.An eccentric screw pump or a can also be used as the mixing machine 4 standard mixers equipped with conveyors are used. It is essential that it has its own funding, ie the liquid 2 and the solid 38 gives a delivery pulse.

Soweit im Ausführungsbeispiel nach Fig. 2 gleiche Teile verwendet werden, werden diese mit identischen Bezugsziffern bezeichnet wie in Fig. 1. Soweit funktionell gleiche aber konstruktiv andere Teile eingesetzt werden, werden diese mit der jeweils gleichen Bezugsziffer mit einem hochgesetzten Strich bezeichnet. Auf die vorhergehende Beschreibung wird verweisen.Insofar as the same parts are used in the exemplary embodiment according to FIG. 2, these are designated with identical reference numbers as in FIG. 1. As far as functionally identical but structurally different parts are used, these are given the same reference number with a superscript Dash called. Reference is made to the previous description.

Bei dem Ausführungsbeispiel nach Fig. 2 ist keine vom Vorratsbehälter gesonderte Mischmaschine vorgesehen; vielmehr ist der Vorratsbehälter 1' mit einem Intensiv-Rührwerk 3' versehen, das eine intensive Umwälzung der Flüssigkeit 2 im Vorratsbehälter 1' bewirkt. Derartige Rührwerke 3' sind bekannt; es handelt sich beispielsweise um sogenannte Wendel-Rührwerke, die insbesondere auch eine ausgeprägte Einzugswirkung im Bereich der Oberfläche der Flüssigkeit 2 auf letztere ausüben. Der Vorratsbehälter 1' ist mit einem Deckel 54 versehen, in dem eine Entlüftungs-Öffnung 55, beispielsweise für eine Pendelentlüftung vorgesehen ist.In the embodiment of FIG. 2, none is from the reservoir separate mixing machine provided; rather, the storage container 1 ' provided with an intensive agitator 3 ', which an intensive circulation the liquid 2 in the reservoir 1 'causes. Such agitators 3 ' are known; for example, so-called spiral agitators, which in particular also has a pronounced pull-in effect in the area exert the surface of the liquid 2 on the latter. The reservoir 1 'is provided with a cover 54, in which a vent opening 55, is provided for example for a pendulum ventilation.

Der Zuführstutzen 13 in der zu Fig. 1 beschriebenen Ausführung ist im Deckel 54 angebracht und endet oberhalb der Flüssigkeit 2. Er ist so weit oberhalb der Flüssigkeit 2 angeordnet, daß er auch nach völligem Einmischen des gesamten Feststoffes 38 in die Flüssigkeit 2 nicht in dieses Gemisch eintaucht. The feed connector 13 in the embodiment described in FIG. 1 is in the Lid 54 attached and ends above the liquid 2. It is so far arranged above the liquid 2 that he even after complete mixing of the entire solid 38 in the liquid 2 not in this Mixture immersed.

Es ist weiterhin eine Bedieneinrichtung 56 vorgesehen, mittels derer einerseits die Förderleistung der Pumpe 36 durch entsprechende Einstellung der Drehzahl des Pumpen-Antriebsmotors 48 und andererseits die Dosierleistung der Dosiereinrichtung 29 eingestellt werden können. Hierdurch kann insgesamt festgelegt werden, daß der Inhalt des Vorratsbehälters 1' mehrmals umgepumpt wird, während von der Dosiereinrichtung 29 über den Zuführstutzen 13 der Feststoff 38 zugegeben wird. Bei dieser Ausgestaltung ist es insbesondere möglich, die Flüssigkeit 2 bzw. das Gemisch aus Flüssigkeit 2 und steigendem Anteil an Feststoff 38 mehr als 10 mal umzupumpen, bevor die gesamte Menge an Feststoff 38 zugegeben ist. Das Mischen von Flüssigkeit 2 und Feststoff 38 erfolgt in diesem Zusammenhang ausschließlich in dem Vorratsbehälter 1' durch dessen Rührwerk 3'; eine Dispergierung findet hierbei nicht statt. Für viele Anwendungsfälle kann aber eine ausreichend gute Durchmischung vorgenommen werden.An operating device 56 is also provided, by means of which on the one hand, the delivery rate of the pump 36 by appropriate setting the speed of the pump drive motor 48 and on the other hand the Dosing capacity of the metering device 29 can be set. Hereby can be determined overall that the contents of the reservoir 1 'is pumped several times while by the metering device 29 the solid 38 is added via the feed nozzle 13. At this In particular, it is possible to design the liquid 2 or the Mixture of liquid 2 and increasing proportion of solid 38 more than Pump 10 times before adding all of Solid 38 is. The mixing of liquid 2 and solid 38 takes place in this Connection only in the storage container 1 'by its Agitator 3 '; there is no dispersion here. For many Adequate mixing can, however, be used in applications become.

Bei dem Ausführungsbeispiel nach Fig. 2 kommt einem Rührwerksantriebsmotor 57 die Funktion eines Mischantriebsmotors zu, der mittels eines Keilriementriebs 58 die als Mischwelle dienende Rührwerks-Welle 59 des Rührwerks 3' antreibt. Der Vorratsbehälter 1' mit Rührwerk 3' dient beim Ausführungsbeispiel nach Fig. 2 also nicht nur als Vorratsbehälter, sondern auch als Mischeinrichtung.In the embodiment according to FIG. 2 there is an agitator drive motor 57 the function of a mixed drive motor, which by means of a V-belt drive 58, the agitator shaft 59 of the mixer shaft Agitator 3 'drives. The reservoir 1 'with agitator 3' is used for 2 not only as a storage container, but also as a mixing device.

Claims (19)

  1. An installation for the mixing of a given quantity of liquid with a given quantity of powdery solid matter, comprising the following features:
    a storage tank (1, 1') for the given quantity of liquid (2),
    a mixing device (4) having a mixing shaft (9, 59) to be driven by a mixer driving motor (11, 57),
    a liquid supply conduit (34) connecting an inlet hopper (13) of the mixing device (4) with the storage tank (1),
    a solid matter proportioning device (29) opening into the inlet hopper (13), and
    adjustability of the supply capacity of the solid matter proportioning device (29) and of the throughput of the mixing device (4) in such a way that the given quantity of solid matter (38) is added to the given quantity of liquid (2) by several circulations of the liquid (2) through the mixing device (4).
  2. An installation according to claim 1, wherein the mixing device is a mixing machine (4) separate from the storage tank (1) and having an outlet (24), which is connected with the storage tank (1) by a return conduit (25).
  3. An installation according to claim 2, wherein the mixing machine is a screw mixer (4) having a mixing shaft (9), which comprises a screw portion (16) in the vicinity of the inlet hopper (13) and subsequent thereto.
  4. An installation according to claims 2 or 3, wherein the mixing shaft (9) has a portion of intimate mixing (17) in the area upstream of the outlet (24).
  5. An installation according to claim 4, wherein in the vicinity of the portion of intimate mixing (17), the mixing shaft (9) is provided with pin- or strip-type mixing tools (18).
  6. An installation according to claim 5, wherein in the vicinity of the portion of intimate mixing (17), the mixing tools (18) are associated with stationary counterpart tools (20).
  7. An installation according to one of claims 2 to 6, wherein in the vicinity of the outlet (24) of the mixing machine (4), a return conveyor (22) is provided, which is connected with the return conduit (25).
  8. An installation according to claim 7, wherein the return conveyor (22) comprises a pump impeller (23) mounted on the mixing shaft (9) and associated with an outlet passage (24), which is connected with the return conduit (25).
  9. An installation according to one of claims 1 to 8, wherein an agitator unit (3, 3') is disposed in the storage tank (1, 1').
  10. An installation according to one of claims 2 to 9, wherein a control unit (43) is provided, having outputs (46, 47) for the modification of the quantity of liquid (2) fed to the inlet hopper (13) per unit of time and/or of the quantity of liquid (2) put through per unit of time in the mixer (4).
  11. An installation according to claim 10, wherein a level measuring device (41), which is connected to an input (42) of the control unit (43), is disposed in the inlet hopper (13).
  12. An installation according to claim 10 or 11, wherein an output (49) of the control unit (43) is connected to a drive (50) of the solid matter proportioning device (29).
  13. An installation according to claims 2 to 12, wherein an adjustable throttle (51) is disposed in the return conduit (25).
  14. An installation according to claim 13, wherein the throttle (51) is controllable.
  15. An installation according to claim 1, wherein the storage reservoir (1') is a mixing device, into which opens the inlet hopper (13).
  16. An installation according to claim 1 or 15, wherein an intimately mixing agitator unit (3') exhibiting a pronounced feed-in effect is disposed in the storage tank (1').
  17. An installation according to one of claims 1 to 16, wherein above the mixing device, the solid matter supply arrangement and the liquid supply conduit (34) open freely into the inlet hopper (13).
  18. An installation according to claim 17, wherein the solid matter supply arrangement opens into the inlet hopper (13) within the liquid supply arrangement.
  19. An installation according to one of claims 1 to 18, wherein the storage tank (1') is closed by a cover (54).
EP96102635A 1995-03-03 1996-02-22 Installation for mixing liquids with solid materials Expired - Lifetime EP0729780B1 (en)

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DE19507366 1995-03-03
DE19507366A DE19507366A1 (en) 1995-03-03 1995-03-03 Plant for mixing liquid and solid

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EP0729780A3 EP0729780A3 (en) 1997-01-08
EP0729780B1 true EP0729780B1 (en) 2000-10-18

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EP (1) EP0729780B1 (en)
JP (1) JPH08266880A (en)
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JPH08266880A (en) 1996-10-15
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EP0729780A2 (en) 1996-09-04
DE59605996D1 (en) 2000-11-23
CN1088393C (en) 2002-07-31
DE19507366A1 (en) 1996-09-05
IN187138B (en) 2002-02-09
KR960033507A (en) 1996-10-22
CN1142411A (en) 1997-02-12

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