EP0574728B1 - Checking and transporting of a building material mixture - Google Patents

Checking and transporting of a building material mixture Download PDF

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Publication number
EP0574728B1
EP0574728B1 EP93108255A EP93108255A EP0574728B1 EP 0574728 B1 EP0574728 B1 EP 0574728B1 EP 93108255 A EP93108255 A EP 93108255A EP 93108255 A EP93108255 A EP 93108255A EP 0574728 B1 EP0574728 B1 EP 0574728B1
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EP
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Prior art keywords
mixing
mixture
screw
mixing tube
coupling
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EP93108255A
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German (de)
French (fr)
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EP0574728A1 (en
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Martin Theodor Melchior
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04—Supplying or proportioning the ingredients
    • B28C7/12—Supplying or proportioning liquid ingredients
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/1238—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices
    • B28C5/1292—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices with rotating stirring and feeding or discharging means fixed on the same axis, e.g. in an inclined container fed at its lower part

Definitions

  • the invention relates to a process for the continuous production and simultaneous conveyance of a pumpable building material mixture, such as plastering mortar, containing water and hydraulically bindable solid in a homogeneous mixture, solid and water being added to a mixing chamber approximately in the central region of its mixing space while continuously metering proportionate proportions of the mixture, using a mixing screw are conveyed and mixed with screw spirals rotating around a shaft in a rotating mass flow while building up a dynamic pressure, and partial air inclusions emerge from the resulting mixture in the opposite direction of the dynamic pressure gradient and are discharged from the mixing chamber at a point opposite the conveying direction of the mixing chamber. Furthermore, the invention relates to a device for performing the method.
  • a pumpable building material mixture such as plastering mortar, containing water and hydraulically bindable solid in a homogeneous mixture, solid and water being added to a mixing chamber approximately in the central region of its mixing space while continuously metering proportionate proportions of the mixture, using a mixing screw are conveyed and mixed with screw spirals
  • Methods and devices for producing a pumpable mortar for example for plastering walls or ceilings, are known. These are often designed to carry out a discontinuous mode of operation, ie the device has a separate mixing device, in which the mixture is prepared and this is then poured into a delivery container with a thick material pump flanged on from the mixing device and conveyed from there to the construction site.
  • discontinuous systems in that, in the case of a long interruption between the preparation of the mixture and its further processing, harmful segregation can take place.
  • discontinuous operation has fundamental disadvantages compared to a continuous mode of operation, because interruptions in processing occur between the individual batches, which lead to losses in working hours and productivity and thus unnecessarily burden the construction costs.
  • material losses e.g. in that a mixture produced is not completely consumed, and besides the loss there are also disposal problems.
  • the discontinuously operating devices for the production and conveyance of cleaning agents require a comparatively large amount of mechanical effort with a relatively high transport weight and correspondingly increased costs.
  • DE-B-1 277 819 describes a device for the continuous mixing of powdery to fine-grained bulk material, in particular building materials, and a liquid, with a storage container which holds the bulk material and is arranged essentially vertically, a mixing container directly downstream of this , which has a shaft with attached mixing tools and with in the longitudinal direction of the shaft extending through elevations for venting the resulting mixture and further with a feed pump downstream of the mixing tank, proposed that the mixing tank has a venting device at its higher end.
  • a device for mixing and conveying mortar or similar materials in which the material is fed to a metering device and mixed with liquid, mixed and conveyed.
  • the device has a flow baffle which is designed as a baffle plate or as a conically shaped plate.
  • an air-entrained mortar mixture is produced in a separate mixing room by introducing air under pressure.
  • the invention has for its object to provide a method of the type mentioned in the preamble of claim 1 and an apparatus for performing the method which, while avoiding the aforementioned difficulties and technical limits, the production of a homogeneous, pumpable and sprayable water / solid mortar mixture uniform high quality and without air pockets with the smallest possible construction volume and weight of the device.
  • a device for carrying out the method is characterized by the features a) to d) specified in the characterizing part of claim 2.
  • the device shown in the figure has a mixing tube (1) which is circular in cross section and in the interior of which a mixing screw (3) with worm spirals (4) is arranged around the drive shaft (2).
  • a mixing tube (1) which is circular in cross section and in the interior of which a mixing screw (3) with worm spirals (4) is arranged around the drive shaft (2).
  • Approximately half the length of the mixing tube (1) has a feed opening (5) and within it a metering device (6) for metering solids.
  • a concentric water injection device (7) rotating in a peripheral arrangement inside the mixing tube (1).
  • This consists of an annular hollow profile welded to the inner wall of the mixing tube (1) in a watertight manner and, in accordance with the exemplary embodiment shown, has an angular cross section.
  • the hollow profile can also have a semicircular or U-shaped or similar cross section.
  • Distributed nozzle bores (19) are located on the circumference of the hollow profile, from which the mixing water for mashing the solid is injected into the solid under pressure in concentric jets.
  • the water injection device (7) has a water connection (24) which is connected to a pressurized water source via a line (not shown) with an adjustable metering device.
  • a breather (9) is arranged in the upper area of the mixing tube (1).
  • the mixing device at the output end (10) on the mixing screw (3) has a baffle plate (11) which releases a peripheral annular gap (13) between the inner wall of the mixing tube 1 and its outer edge (12).
  • the mixing tube (1) has a concentric discharge opening at a distance from the baffle plate (11) in the discharge direction (14) having a comparatively smaller diameter than the baffle plate (11), to which the housing (15) of a thick material kneading pump (16) connects.
  • the drive shaft (2) of the mixing screw (3) is connected to the rotor (18) of the pump (16) in a rotationally fixed manner via a coupling (17).
  • the solids feed opening (5) very advantageously has a collar (20) with a flange (21) for mounting on a solids silo container with intermediate arrangement of the solids metering device (6).
  • This is advantageously designed as a rotary valve.
  • the coupling (17) between the drive shaft (2) and the pump rotor (18) is designed as an elastic coupling with coupling intermediate members made of elastic material such as rubber or plastic.
  • the coupling (17) can be equipped with an overload safety device, for example with a shear pin safety device (22).
  • the mixing screw (3) can also be at least partially equipped with mixing paddles instead of part or all of its screw turns (4). Further alternative configurations relate to the position of the mixing tube (1). This can either be arranged with a vertical axis (yy), as shown, or also with a horizontal axis.
  • the device according to the invention is suitable with great advantage for fully automatic, continuous operation for the production and simultaneous conveyance of a pumpable building material mixture, such as plastering mortar, containing water and hydraulically bindable solid in a homogeneous mixture.
  • a pumpable building material mixture such as plastering mortar
  • Its special design and mode of operation according to the invention ensures that no air inclusions are conveyed during this continuous operation, which enables a completely undisturbed, uniform application of the cleaning material to the construction site while overcoming the difficulties that existed to date.
  • the device is uncomplicated, requires only a comparatively small construction volume and light weight and is distinguished by a high degree of reliability. In this respect, the invention optimally fulfills the task set out above.

Abstract

The invention relates to a process for the continuous production and simultaneous transporting of a pumpable building material (construction material) mixture, such as plaster mortar, containing water and hydraulically bindable solid in a homogeneous mixture. The process is characterised in that solid and water are charged to a mixing chamber, approximately in the central region of its mixing space, with continuous metering of proportional mixture components and are transported using a mixing screw (3) with screw helices (4) circulating around a shaft, in a toroidal material flow, with the build-up of a backpressure. In the process they are mixed, proportional air inclusions emerging from the resulting mixture in the opposite direction to the backpressure gradient and being discharged from the mixing chamber at a point in the mixing space opposite to the transport direction. The process is also characterised in that the material flow of the mixture is transported around a concentric baffle plate (11) at the end of the mixing zone, is charged from circumferential regions of the mixing space into the feed side of a slurry pump (16) and is transported further therein with the build-up of a pump pressure. A device is described. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur kontinuierlichen Herstellung und simultanen Förderung eines Wasser sowie hydraulisch bindungsfähigen Feststoff in homogener Mischung enthaltenden pumpfähigen Baustoffgemisches wie Putzmörtel, wobei Feststoff und Wasser unter kontinuierlicher Dosierung verhältnismäßiger Mischungsanteile einer Mischkammer etwa im mittleren Bereich ihres Mischraumes aufgegeben und dabei unter Verwendung einer Mischschnecke mit um eine Welle umlaufenden Schneckenwendeln in einer turnusförmigen Massenströmung unter Aufbau eines Staudrucks gefördert und dabei gemischt werden, und wobei anteilige Lufteinschlüsse in Gegenrichtung des Staudruckgradienten aus der entstehenden Mischung austreten und an einer der Förderrichtung entgegengesetzten Stelle des Mischraumes aus der Mischkammer ausgetragen werden. Weiterhin betrifft die Erfindung eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a process for the continuous production and simultaneous conveyance of a pumpable building material mixture, such as plastering mortar, containing water and hydraulically bindable solid in a homogeneous mixture, solid and water being added to a mixing chamber approximately in the central region of its mixing space while continuously metering proportionate proportions of the mixture, using a mixing screw are conveyed and mixed with screw spirals rotating around a shaft in a rotating mass flow while building up a dynamic pressure, and partial air inclusions emerge from the resulting mixture in the opposite direction of the dynamic pressure gradient and are discharged from the mixing chamber at a point opposite the conveying direction of the mixing chamber. Furthermore, the invention relates to a device for performing the method.

Verfahren und Vorrichtungen zur Herstellung eines pumpfähigen Mörtels beispielsweise zum Verputzen von Wänden bzw. Decken sind bekannt. Diese sind vielfach zur Durchführung einer diskontinuierlichen Betriebsweise ausgebildet, d.h. die Vorrichtung besitzt eine separate Mischeinrichtung, worin die Mischung bereitet und diese dann in einen von der Mischeinrichtung getrennten Lieferbehälter mit angeflanschter Dickstoffpumpe umgefüllt und daraus zur Baustelle gefördert wird.Methods and devices for producing a pumpable mortar, for example for plastering walls or ceilings, are known. These are often designed to carry out a discontinuous mode of operation, ie the device has a separate mixing device, in which the mixture is prepared and this is then poured into a delivery container with a thick material pump flanged on from the mixing device and conveyed from there to the construction site.

Nachteile derartiger diskontinuierlich arbeitender Systeme bestehen u. a. darin, daß bei einer längeren Unterbrechung zwischen Bereitung der Mischung und deren Weiterverarbeitung eine schädliche Entmischung stattfinden kann. Darüberhinaus hat ein diskontinuierlicher Betrieb gegenüber einer kontinuierlichen Betriebsweise grundsätzliche Nachteile, weil zwichen den einzelnen Chargen Unterbrechungen bei der Verarbeitung auftreten, die zu Verlusten an Arbeitszeiten und Produktivität führen und somit die Baukosten unnötig belasten. Und schließlich ergeben sich Materialverluste z.B. dadurch, daß eine hergestellte Mischung nicht vollständig verbraucht wird, wobei neben dem Verlust auch noch Entsorgungsprobleme entstehen. Darüberhinaus beanspruchen die diskontinuierlich arbeitenden Geräte zur Herstellung und Förderung von Putzmitteln einen vergleichsweise großen maschinellen Aufwand mit relativ hohem Transportgewicht und entsprechend erhöhten Kosten.Disadvantages of such discontinuous systems exist. a. in that, in the case of a long interruption between the preparation of the mixture and its further processing, harmful segregation can take place. In addition, discontinuous operation has fundamental disadvantages compared to a continuous mode of operation, because interruptions in processing occur between the individual batches, which lead to losses in working hours and productivity and thus unnecessarily burden the construction costs. And finally there are material losses e.g. in that a mixture produced is not completely consumed, and besides the loss there are also disposal problems. In addition, the discontinuously operating devices for the production and conveyance of cleaning agents require a comparatively large amount of mechanical effort with a relatively high transport weight and correspondingly increased costs.

Zur Abhilfe wurden bereits Geräte mit kontinuierlicher Arbeitsweise für Aufbereitung und Förderung in einem geschlossenen System entwickelt. Dabei ergab sich die Schwierigkeit, daß beim Mischprozeß mit dem Feststoff Luftanteile in die Mischung eingeschlossen werden, welche dann bei der Verarbeitung zu Schwierigkeiten führen und insbesondere die Gleichmäßigkeit des Auftrages von Putzmaterial auf Decken und Wände erheblich stören.To remedy this, devices with continuous operation for processing and conveying in a closed system have already been developed. The difficulty arose that during the mixing process with the solid air portions are included in the mixture, which then lead to difficulties during processing and, in particular, considerably disrupt the uniformity of the application of cleaning material to ceilings and walls.

Um diesem Nachteil zu begegnen wird mit der DE-B-1 277 819 eine Vorrichtung zum kontinuierlichen Mischen von pulverförmigem bis feinkörnigem Schüttgut, inbesondere Baustoffen, und einer Flüssigkeit, mit einem das Schüttgut aufnehmenden, im wesentlichen lotrecht angeordneten Vorratsbehälter, einem diesem unmittelbar nachgeschalteten Mischbehälter, der eine Welle mit daran befestigten Mischwerkzeugen und mit in Längsrichtung der Welle sich erstreckenden durchgehenden Erhebungen zur Entlüftung des entstehenden Gemisches aufweist und ferner mit einer dem Mischbehälter nachgeschalteten Förderpumpe, vorgeschlagen, das der Mischbehälter an seinem höher gelegenen Ende eine Entlüftungsvorrichtung aufweist.In order to counter this disadvantage, DE-B-1 277 819 describes a device for the continuous mixing of powdery to fine-grained bulk material, in particular building materials, and a liquid, with a storage container which holds the bulk material and is arranged essentially vertically, a mixing container directly downstream of this , which has a shaft with attached mixing tools and with in the longitudinal direction of the shaft extending through elevations for venting the resulting mixture and further with a feed pump downstream of the mixing tank, proposed that the mixing tank has a venting device at its higher end.

Aus der DE-U-91 05 027 ist eine Vorrichtung zum Mischen und Fördern von Mörtel oder dergleichen Materialien bekannt, bei der das Material einer Dosiervorrichtung zugeführt und mit Flüssigkeit versetzt, gemischt und gefördert wird. Die Vorrichtung weist eine Fließschikane auf, die als Stauscheibe oder als konisch geformter Teller ausgebildet ist.From DE-U-91 05 027 a device for mixing and conveying mortar or similar materials is known in which the material is fed to a metering device and mixed with liquid, mixed and conveyed. The device has a flow baffle which is designed as a baffle plate or as a conically shaped plate.

Zwischen dieser Stauscheibe und einer Verdrängerpumpe zur Förderung des aufbereiteten Mörtelgemisches wird in einem separaten Mischraum durch Eintragen von Luft unter Druck ein Luftporenmörtelgemisch hergestellt.Between this baffle plate and a displacement pump for conveying the prepared mortar mixture, an air-entrained mortar mixture is produced in a separate mixing room by introducing air under pressure.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der im Oberbegriff von Anspruch 1 genannten Art sowie eine Vorrichtung zur Durchführung des Verfahrens anzugeben, welches unter Vermeidung der vorgenannten Schwierigkeiten und technischen Grenzen die Herstellung eines homogenen, pump- und spritzfähigen Wasser/Feststoff-Mörtelgemisches von gleichmäßiger hoher Qualität und ohne Lufteinschlüsse bei möglichst geringem Bauvolumen und Gewicht der Vorrichtung ermöglicht.The invention has for its object to provide a method of the type mentioned in the preamble of claim 1 and an apparatus for performing the method which, while avoiding the aforementioned difficulties and technical limits, the production of a homogeneous, pumpable and sprayable water / solid mortar mixture uniform high quality and without air pockets with the smallest possible construction volume and weight of the device.

Die Lösung der Aufgabe gelingt bei einem Verfahren der eingangs genannten Art mit den im Kennzeichnungsteil von Anspruch 1 angegebenen Verfahrensschritten.The problem is solved in a method of the type mentioned at the outset with the method steps specified in the characterizing part of claim 1.

Eine Vorrichtung zur Durchführung des Verfahrens ist durch die im Kennzeichnungsteil von Anspruch 2 angegebenen Merkmale a) bis d) gekennzeichnet.A device for carrying out the method is characterized by the features a) to d) specified in the characterizing part of claim 2.

Weitere Ausgestaltungen des Verfahrens und der Vorrichtung sind entsprechend den Unteransprüchen vorgesehen.Further refinements of the method and the device are provided in accordance with the subclaims.

Die Erfindung wird in einer rein schematischen Zeichnung in beispielhafter Ausführungsform gezeigt, wobei aus deren Beschreibung weitere Einzelheiten und Vorteile entnehmbar sind.The invention is shown in a purely schematic drawing in an exemplary embodiment, further details and advantages being apparent from the description thereof.

Die in der Figur gezeigte Vorrichtung weist ein im Querschnitt kreisförmiges Mischrohr (1) auf, in dessen Innern als Mischorgan eine um eine Antriebswelle (2) umlaufende Mischschnecke (3) mit Schneckenwendeln (4) angeordnet ist. Etwa in der halben Länge des Mischrohres (1) ist eine Aufgabeöffnung (5) und innerhalb derselben eine Dosiereinrichtung (6) zur dosierenden Aufgabe von Feststoffen angeordnet. Neben der Aufgabeöffung (5) befindet sich im Innern des Mischrohres (1) eine in peripherer Anordnung umlaufende konzentrische Wassereindüsungseinrichtung (7). Diese besteht aus einem ringförmigen, mit der Innenwand des Mischrohres (1) wasserdicht verschweißten Hohlprofil und weist entsprechend dem gezeigten Ausführungsbeispiel einen winkelförmigen Querschnitt auf. Das Hohlprofil kann jedoch auch einen halbkreisförmigen bzw. U-förmigen oder ähnlichen Querschnitt aufweisen. Am Umfang des Hohlprofiles befinden sich verteilt angeordnete Düsenbohrungen (19), aus welchen das Anmachwasser zum Anmaischen des Feststoffes unter Druck in konzentrischen Strahlen in den Feststoff eingedüst wird. Die Wassereindüsungsvorrichtung (7) weist einen Wasseranschluß (24) auf, der über eine (nicht gezeigte) Leitung mit einer einstellbaren Dosiereinrichtung an eine Druckwasserquelle angeschlossen ist.
Am antriebsseitigen Ende (8) der Mischschnecke (3) ist im oberen Bereich des Mischrohres (1) ein Entlüfungsorgan (9) angeordnet. Weiterhin weist die Mischvorrichtung am abtriebsseitigen Ende (10) an der Mischschnecke (3) eine Stauscheibe (11) auf, die zwischen Innenwandung des Mischrohres 1 und ihrem Außenrand (12) einen peripheren Ringspalt (13) freigibt.The device shown in the figure has a mixing tube (1) which is circular in cross section and in the interior of which a mixing screw (3) with worm spirals (4) is arranged around the drive shaft (2). Approximately half the length of the mixing tube (1) has a feed opening (5) and within it a metering device (6) for metering solids. In addition to the feed opening (5), there is a concentric water injection device (7) rotating in a peripheral arrangement inside the mixing tube (1). This consists of an annular hollow profile welded to the inner wall of the mixing tube (1) in a watertight manner and, in accordance with the exemplary embodiment shown, has an angular cross section. However, the hollow profile can also have a semicircular or U-shaped or similar cross section. Distributed nozzle bores (19) are located on the circumference of the hollow profile, from which the mixing water for mashing the solid is injected into the solid under pressure in concentric jets. The water injection device (7) has a water connection (24) which is connected to a pressurized water source via a line (not shown) with an adjustable metering device.
At the drive end (8) of the mixing screw (3), a breather (9) is arranged in the upper area of the mixing tube (1). Furthermore, the mixing device at the output end (10) on the mixing screw (3) has a baffle plate (11) which releases a peripheral annular gap (13) between the inner wall of the mixing tube 1 and its outer edge (12).

Eine Ausgestaltung sieht vor, daß das Mischrohr (1) in Austragsrichtung im Abstand der Stauscheibe (11) eine konzentrische Austragsöffnung (14) mit zur Stauscheibe (11) vergleichsweise kleinerem Durchmesser aufweist, an die sich das Gehäuse (15) einer Dickstoff-Knetpumpe (16) anschließt. Die Antriebswelle (2) der Mischschnecke (3) ist über eine Kupplung (17) mit dem Rotor (18) der Pumpe (16) drehfest verbunden.One embodiment provides that the mixing tube (1) has a concentric discharge opening at a distance from the baffle plate (11) in the discharge direction (14) having a comparatively smaller diameter than the baffle plate (11), to which the housing (15) of a thick material kneading pump (16) connects. The drive shaft (2) of the mixing screw (3) is connected to the rotor (18) of the pump (16) in a rotationally fixed manner via a coupling (17).

Beim Betrieb der erfindungsgemäßen Vorrichtung wird Feststoff und Wasser unter kontinuierlicher Dosierung ihrer verhältnismäßigen Mischungsanteile dem Mischrohr (1) aufgegeben. Dabei erfolgt die volumetrische Dosierung der Feststoffe durch eine Zellenradschleuse (6) und die volumetrische Dosierung des Anmaischwassers mit Hilfe einer an sich bekannten, nicht gezeigten Flüssigkeitsdosiereinrichtung. Beide Dosiereinrichtungen können nach Programm von einem vollautomatischen Leitstand aus angesteuert werden. Durch intensive Drehbewegung der Mischschnecke (3) und ihrer an der Antriebswelle (2) angeordneten Schneckenwendel (4) wird im Mischrohr (1) eine torusförmige Massenströmung erzeugt, wobei Wasser und Feststoff innig homogen gemischt werden. Durch die Massenströmung und die Steigung der Schneckenwende (4) wird in der Materialsäule ein Staudruck aufgebaut, wobei anteilige Lufteinschlüsse in Gegenrichtung des Staudruckgradienten aus der entstehenden Mischung austreten und an einer der Förderrichtung entgegengesetzten Stelle des Mischraumes in dessen Trockenbereich (23) aus dem Mischrohr (1) ausgetragen werden.
Mit großem Vorteil wird dabei der Massenstrom der Mischung am Ende der Mischstrecke um die konzentrische (11) Stauscheibe herum durch den Ringspalt (13) zwischen der Innenwand des Mischrohres (1) und dem Außenrand (12) der Stauscheibe (11) hindurchgefördert. Dadurch wird sichergestellt, daß ausschließlich peripheres Mischgut ohne Lufteinschlüsse gefördert und in die aufgabenseitige Öffnung (25) des Pumpengehäuses (15) eingetragen wird.
Sehr vorteilhaft weist die Feststoff-Aufgabeöffnung (5) einen Kragen (20) mit einem Flansch (21) zum Unterbau an einen Feststoff-Silobehälter unter Zwichenanordnung der Feststoff-Dosiereinrichtung (6) auf. Diese ist vorteilhaft als Zellenradschleuse ausgebildet.
Mit Vorteil ist vorgesehen, daß die Kupplung (17) zwischen Antriebswelle (2) und Pumpenrotor (18) als elastische Kupplung mit aus elastischem Material wie Gummi oder Plastik ausgebildeten Kupplungs-Zwischengliedern ausgebildet ist.
Weiterhin kann die Kupplung (17) mit einer Überlastsicherung, beispielsweise mit einer Scherbolzensicherung (22) ausgerüstet sein. Auch kann die Mischschnecke (3) anstelle eines Teils oder aller ihrer Schneckenwenden (4) wenigstens teilweise mit Misch-Paddeln ausgerüstet sein. Weitere alternative Ausgestaltungen betreffen die Lage des Mischrohres (1). Dieses kann entweder mit vertikaler Achse (y-y), wie gezeigt, oder auch mit horizontaler Achse angeordnet sein.When the device according to the invention is in operation, solid and water are fed into the mixing tube (1) while continuously metering their proportionate proportions of the mixture. The volumetric metering of the solids takes place through a rotary valve (6) and the volumetric metering of the mashing water with the aid of a liquid metering device which is known and not shown. Both dosing devices can be controlled according to the program from a fully automatic control center. The torch-shaped mass flow is generated in the mixing tube (1) by intensive rotation of the mixing screw (3) and its screw spiral (4) arranged on the drive shaft (2), water and solid being mixed intimately and homogeneously. Due to the mass flow and the slope of the screw turn (4), a dynamic pressure is built up in the material column, whereby proportionate air inclusions emerge from the resulting mixture in the opposite direction of the dynamic pressure gradient and from the mixing pipe (23) in the drying area (23) of the mixing chamber ( 1) are carried out.
The mass flow of the mixture at the end of the mixing section around the concentric (11) baffle plate is conveyed with great advantage through the annular gap (13) between the inner wall of the mixing tube (1) and the outer edge (12) of the baffle plate (11). This ensures that only peripheral mixed material is conveyed without air inclusions and is introduced into the opening (25) of the pump housing (15) on the task side.
The solids feed opening (5) very advantageously has a collar (20) with a flange (21) for mounting on a solids silo container with intermediate arrangement of the solids metering device (6). This is advantageously designed as a rotary valve.
It is advantageously provided that the coupling (17) between the drive shaft (2) and the pump rotor (18) is designed as an elastic coupling with coupling intermediate members made of elastic material such as rubber or plastic.
Furthermore, the coupling (17) can be equipped with an overload safety device, for example with a shear pin safety device (22). The mixing screw (3) can also be at least partially equipped with mixing paddles instead of part or all of its screw turns (4). Further alternative configurations relate to the position of the mixing tube (1). This can either be arranged with a vertical axis (yy), as shown, or also with a horizontal axis.

Die Vorrichtung nach der Erfindung ist mit großem Vorteil zum vollautomatischen, kontinuierlichen Betrieb für die Herstellung und simultane Förderung eines Wasser sowie hydraulisch bindungsfähigen Feststoff in homogener Mischung enthaltenden pumpfähigen Baustoffgemisches wie Putzmörtel geignet. Durch ihre besondere Ausgestaltung und Betriebsweise nach der Erfindung ist sichergestellt, daß bei diesem kontinuierlichen Betrieb keine Lufteinschlüsse mitgefördert werden, wodurch unter Überwindung der bisher bestehenden Schwierigkeiten ein völlig ungestörtes, gleichmäßiges Auftragen des Putzmaterials an der Baustelle ermöglicht wird. Darüberhinaus ist die Vorrichtung unkompliziert, beansprucht nur vergleichsweise geringes Bauvolumen und geringes Gewicht und zeichnet sich durch einen hohen Grad an Zuverlässigkeit aus. Insofern erfüllt die Erfindung in optimaler Weise die eingangs gestellte Aufgabe.The device according to the invention is suitable with great advantage for fully automatic, continuous operation for the production and simultaneous conveyance of a pumpable building material mixture, such as plastering mortar, containing water and hydraulically bindable solid in a homogeneous mixture. Its special design and mode of operation according to the invention ensures that no air inclusions are conveyed during this continuous operation, which enables a completely undisturbed, uniform application of the cleaning material to the construction site while overcoming the difficulties that existed to date. In addition, the device is uncomplicated, requires only a comparatively small construction volume and light weight and is distinguished by a high degree of reliability. In this respect, the invention optimally fulfills the task set out above.

Claims (5)

  1. A process for the continuous production and simultaneous conveyance of a pumpable building material mixture, such as plaster, containing water as well as hydraulically settable solid material in homogeneous mixture, said solid material and said water being fed to a mixing chamber approximately at the middle region of the mixing space thereof, under continuous dosage of proportional portions of the mixture, and at the same time being conveyed, utilizing a screw mixer with screw flights rotating about a shaft, in a torus-shaped mass flow under formation of a back pressure, and being mixed in the course of this, and proportional air inclusions escaping from the nascent mixture in a direction opposite to the back pressure gradient and being discharged from the mixing chamber at a point of the mixing space opposite to the direction of conveyance, characterized in that solid material is fed under pressure to the mixing chamber in volumetric dosage and utilizing a cellular wheel sluice, and water is fed under pressure into said mixing chamber in volumetric dosage and utilizing a plurality of peripheral concentric nozzle jets, and that the mass flow of the mixture is at the end of the mixing line conveyed around a concentric baffle plate, fed to the feed side of a viscous-matter pump from peripheral regions of the mixing space, and is conveyed farther therein under formation of a pump pressure.
  2. A device for the continuous production and simultaneous conveyance of a pumpable building material mixture, such as plaster, containing water and hydraulically settable solid material in homogenous mixture, for carrying out the process according to claim 1, comprising
    a mixing tube (1), in the interior of which there is arranged as a mixing element a screw mixer (3) rotating on a drive shaft (2) and having screw flights (4), and
    at the drive end (8) of the screw mixer (3), in the upper region of the mixing tube (1), there is arranged a venting element (9), and
    the drive shaft (2) of the screw mixer (3) is connected at torsional strength via a coupling (17) with the rotor (18) of the viscous-matter pump (16), characterized by the features:
    a) at approximately half-length of the mixing tube (1) there is arranged a feed opening (5) and within the same a metering device (6) for solid matter, which metering device (6) has a cellular wheel sluice,
    b) next to the feed opening (5), in the interior of the mixing tube (1) there is a device (7) for water supply via nozzles, which device (7) is arranged to rotate in peripheral arrangement and is a hollow profile which is welded watertight to the interior wall of the mixing tube (1) and is provided with a plurality of nozzle bores (19) distributed along the periphery thereof and has a cross section which is, for example, angular or U-shaped or semicircular,
    c) at the power take-off end (10) the screw mixer (3) is provided with a baffle plate (11) which leaves a peripheral annular gap (13) between the interior wall of the mixing tube (1) and the outer edge (12) of the baffle plate (11),
    d) the mixing screw (3) is provided with mixing paddles instead of at least part of its screw flights (4).
  3. The device according to claim 2, characterized in that the coupling (17) is arranged between the drive shaft (2) and the pump rotor (18) of the viscous matter pump (16) as an elastic coupling, and is formed with coupling links of elastic material such as rubber or plastic.
  4. The device according to claim 2 or 3, characterized in that the coupling (17) is provided with an overload protection device, for example with a shearing pin safety device (22).
  5. The device according to claim 2, characterized in that the venting element (9) is located at the mixing tube (1) in the dry section (23) thereof.
EP93108255A 1992-06-19 1993-05-21 Checking and transporting of a building material mixture Expired - Lifetime EP0574728B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4219880A DE4219880C2 (en) 1992-06-19 1992-06-19 Device for the continuous production and simultaneous delivery of a pumpable building material mixture, such as plastering mortar, containing water and hydraulically bindable solid in a homogeneous mixture
DE4219880 1992-06-19

Publications (2)

Publication Number Publication Date
EP0574728A1 EP0574728A1 (en) 1993-12-22
EP0574728B1 true EP0574728B1 (en) 1997-04-02

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EP93108255A Expired - Lifetime EP0574728B1 (en) 1992-06-19 1993-05-21 Checking and transporting of a building material mixture

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EP (1) EP0574728B1 (en)
AT (1) ATE151008T1 (en)
DE (2) DE4219880C2 (en)

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DE29804459U1 (en) * 1998-03-12 1998-08-13 Bug Betriebs & Grundbesitz Device for the on-site production of pumpable mortar compounds
EP1000718A3 (en) * 1998-11-05 2002-06-05 Wildgruber Baustoffwerke GmbH &amp; Co. KG Mixer for making a pumpable mortar
CN1114473C (en) * 2000-06-19 2003-07-16 乔辛姆·霍尔兹 Method for preparing soild-water compound and method for implementing the method
CN102233614A (en) * 2011-04-22 2011-11-09 三一重工股份有限公司 Liquid weighing and feeding device and concrete production equipment comprising same
CH708983B1 (en) 2013-12-10 2017-12-29 S&P Clever Reinforcement Company Ag Mixing and conveying system for a mortar mixture.
CN107269002A (en) * 2016-04-07 2017-10-20 中建四局第六建筑工程有限公司 A kind of high grade rock sand concrete super high pump-conveying method and device
CN111350353B (en) * 2020-04-07 2020-10-23 永康克卡自动化设备有限公司 Construct feeder of fixed quality of conveying at every turn

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DE1277819B (en) * 1965-05-12 1968-09-19 Karl Schlecht Dipl Ing Device for continuous mixing of powdery to fine-grained bulk material
DE1950910C3 (en) * 1969-10-09 1980-05-08 Beton- Und Monierbau Ag, 4000 Duesseldorf Process for the automatic control of the addition of water during concrete production and device for carrying out the process
DE2129250A1 (en) * 1971-06-12 1973-01-04 Zyklos Metallbau Kg MIXING MACHINE FOR THE PRODUCTION OF PLASTER COMPOUNDS
DE2218418A1 (en) * 1972-04-17 1973-10-31 Wilhelm Fleissner MIXING AND SPRAYING DEVICE FOR PLASTIC AND GRAINY GOODS
DE2340246A1 (en) * 1973-08-09 1974-09-19 Karl Dipl-Ing Schlecht CONTINUOUS MIXING PUMP
AT346746B (en) * 1974-04-02 1978-11-27 Hellfried Kiwisch Ges M B H DEVICE FOR THE CONTINUOUS PRODUCTION OF A SPRAYABLE MASS FROM A DRY, FINE-GRAY GOOD AND A LIQUID
DE3041107C2 (en) * 1980-10-31 1985-01-31 Anton 8973 Hindelang Wachter Device for the continuous mixing of mortar
DE3242492C2 (en) * 1982-11-18 1985-10-10 P.F.T. Putz- und Fördertechnik GmbH, 8715 Iphofen Device for generating an air-entrained mixture of a building material with water
DE3421916A1 (en) * 1984-06-13 1985-12-19 Hasit Trockenmörtel GmbH & Co KG, 8050 Freising Apparatus for producing insulating mortar
DE3809661C2 (en) * 1988-03-23 1999-02-18 Reburg Patentverwertungs Gmbh Device for continuously mixing a building material
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DE9105027U1 (en) * 1991-04-24 1991-09-19 Winkler, Hans, 7801 Bollschweil, De
DE9111754U1 (en) * 1991-09-20 1991-11-28 Adolf A. Fleischmann Inh. Werner Fleischmann, 6000 Frankfurt, De

Also Published As

Publication number Publication date
EP0574728A1 (en) 1993-12-22
DE4219880C2 (en) 1996-07-18
DE59306008D1 (en) 1997-05-07
DE4219880A1 (en) 1993-12-23
ATE151008T1 (en) 1997-04-15

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