EP0584573A1 - Device for making pumpable mortar on the building site - Google Patents

Device for making pumpable mortar on the building site Download PDF

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Publication number
EP0584573A1
EP0584573A1 EP93112166A EP93112166A EP0584573A1 EP 0584573 A1 EP0584573 A1 EP 0584573A1 EP 93112166 A EP93112166 A EP 93112166A EP 93112166 A EP93112166 A EP 93112166A EP 0584573 A1 EP0584573 A1 EP 0584573A1
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EP
European Patent Office
Prior art keywords
screw
mixing
sand
mixing device
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93112166A
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German (de)
French (fr)
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EP0584573B1 (en
Inventor
Helmut Wildgruber
Johann Widl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BUG BETRIEBSANLAGEN und GRUNDBESITZ GmbH
Original Assignee
BUG BETRIEBSANLAGEN und GRUNDBESITZ GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE9211567U external-priority patent/DE9211567U1/en
Application filed by BUG BETRIEBSANLAGEN und GRUNDBESITZ GmbH filed Critical BUG BETRIEBSANLAGEN und GRUNDBESITZ GmbH
Publication of EP0584573A1 publication Critical patent/EP0584573A1/en
Application granted granted Critical
Publication of EP0584573B1 publication Critical patent/EP0584573B1/en
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Classifications

    • 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
    • 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
    • B01F27/21—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts
    • B01F27/2123—Shafts with both stirring means and feeding or discharging means
    • 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
    • B01F27/61—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis about an inclined axis
    • 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
    • B01F27/62—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis comprising liquid feeding, e.g. spraying means
    • 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
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • 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

Definitions

  • the invention relates to a device for the on-site production of pumpable mortar compositions, consisting of a screw mixing device which can be supplied with a metered amount of water continuously via a filling hopper dry material and a connecting piece following the feeding hopper in the conveying direction, and from a screw pump connected downstream of the screw mixing device.
  • the screw mixing device comprises several mixing zones, namely a screw mixer arranged coaxially with the screw pump, which is driven together with the screw pump, and above and parallel to this unit, a screw conveyor working in opposite directions, between its inlet opening, which can be filled with dry mortar, and its one below arranged unit connected outlet opening has a worm member, which consists of the succession of a screw conveyor, a metering screw and a There is a premix screw on a common shaft.
  • the device described primarily provides liquid screed with a consistent consistency. If, however, plaster or masonry mortar, which is much thicker than liquid screed, is to be produced with this device, in addition to replacing the screw pump with a correspondingly more powerful unit, further conversions are required, namely an exchange of all upstream mixing elements for other types.
  • the invention has for its object to simplify the device of the type specified in the introduction and its conversion from the production of self-leveling screed to the production of plaster and masonry mortar and vice versa.
  • the screw mixing device and the screw pump are arranged coaxially one behind the other along an axis falling in the conveying direction, which includes an angle with the horizontal between 10 ° and 30 °, that the screw mixing device and the screw pump have a common drive unit and that the mixing element of the screw mixing device comprises only two sections, of which the first section is essentially designed for conveying the dry material added as dry mortar to the water connection piece and the second section for mixing the dry mortar with the water.
  • the proposed device is therefore much simpler in construction than the device of the type specified in the introduction.
  • a single (gear) drive motor is sufficient for mixing and pumping.
  • the retrofitting of the device from the production of self-leveling screed to the production of plaster and masonry mortar (and vice versa) is considerably simplified.
  • only the single mixing element needs to be replaced.
  • the proposed device is particularly easy to transport because of its simple structure.
  • the mixing element runs at a speed of 150 to 300 rpm and the screw pump delivers 70 to 100 liters of mortar mass per minute.
  • the embodiment according to claim 3 achieves a particularly uniform loading of the mixing element with the dry mortar and thereby improves the mixing quality.
  • the embodiment according to claim 4 relates to the design of the mixing element for the production of spray plaster (or masonry mortar).
  • the embodiment according to claim 5 relates to the design of the mixing element for the production of liquid screed which is considerably thinner in comparison to plaster or masonry mortar.
  • the device according to claims 1 to 5 requires ready-to-use dry material premixed with sand, which comes, for example, from a silo installed on the construction site, under the outlet of which the device with its filling funnel is positioned. Because of the transport costs, among other things, this is delivered ready-to-use, consisting of approximately 50% sand Dry material is more expensive than mortar masses produced on site in the same ratio of sand and binding agent (e.g. recipes based on cement and / or anhydrite).
  • the invention is therefore based on the further object of improving the proposed device to the effect that it can optionally also be used to produce pumpable mortar compositions, in particular liquid screed, from dry binder and sand added separately therefrom.
  • the screw mixing device and the screw pump are arranged coaxially one behind the other along an axis falling in the conveying direction, which includes an angle between 10 ° and 30 ° with the horizontal, that the screw mixing device and the screw pump have a common drive unit, that the mixing element of the screw mixing device comprises two sections, the first section of which is essentially designed for conveying the dry material added as a binder up to the water connection socket and the second section for mixing the binder with the water, and that the screw mixing device at the level of the second section of its mixing element has an opening on its upper side in its tubular jacket for loading with sand.
  • This device can be further configured in the same manner as indicated above with reference to claims 2 to 5 for the device according to claim 1.
  • the mixing device is particularly suitable for the production of self-leveling screed from binder, water and subsequently introduced into the mixing zone Sand is suitable. Accordingly, the mixing device according to claim 5 is preferred.
  • This inventive improvement of the device explained above, which works with dry material premixed with dry material, is based on the knowledge that when the throughput (the delivery rate) of the screw pump is greater than the delivery rate of the upstream mixing device, the mixing zone is only partially filled with material.
  • the mixing zone thus contains air-filled cavities, often in the form of separate air cushions, which can be filled to a certain extent with the required amount of sand. It is surprising that a homogeneous, pumpable mortar mass can be produced in this way despite the very short mixing section.
  • the air cavities required for feeding the sand can be created by replacing the worm pump produced from dry mortar and water with a given drive speed of the common shaft of the worm mixing device and the worm pump for such a higher delivery rate.
  • the above-mentioned effect occurs, for example, at a speed of 200 rpm, so that an increase in the speed above this value leads to the desired air cushions in the binder / water mixture.
  • a sand feed hopper is arranged above the sand loading opening provided in the casing of the screw mixing device.
  • the sand feed hopper has a tubular funnel neck and that a sand conveyor screw is provided in the funnel neck, which can be driven by means of a gear motor arranged above the sand feed hopper.
  • a sand scraper following the course of the inner wall of the funnel or another stirring element can be combined with the sand screw conveyor, which ensures that the possibly moist sand sags evenly.
  • the speed of the screw conveyor is determined so that it has the desired mixing ratio, e.g. 1: 1, from binder to sand.
  • the sand feed hopper can be used in any way, e.g. can also be kept automatically from a silo using fill level sensors known per se in the funnel filled with sand.
  • a simpler option is specified in claim 9 and provides that a metering conveyor belt for the sand ends at the inlet opening of the sand feed hopper. Suitable metering conveyor belts are known per se.
  • On the feed side you have a shaft into which the sand e.g. is shoveled. The amount of sand transported away from the belt running at a constant speed per unit of time can be adjusted via a gap which can be adjusted.
  • the discharge end of the metering conveyor belt connectable to the sand filling funnel.
  • the sand feed hopper is arranged with a vertical central axis is and carries a bracket rotatable about its central axis for the discharge end of the metering conveyor belt, on which the gear motor for the sand conveyor screw is also mounted. The holder can thus be brought into the position depending on the local conditions in which the metering conveyor belt is located.
  • the funnel-shaped outlet 1 of a dry mortar silo which is otherwise not shown, is connected via an elastic intermediate piece 2, for example a short hose section or an elastic bellows, to an opening in the lid 3a of a filling funnel 3, which opens into a screw mixing device 4 .
  • the screw mixing device 4 contains a mixing element 5, which is shown in FIG. 2, but is optional can also be exchanged for the mixing element 9 shown in FIG. 3.
  • the mixing element 5 can be driven by means of an electric motor 6, which is only indicated schematically, with a transmission 6a connected at a constant speed of a few hundred revolutions per minute.
  • a screw pump 7 of known type is flanged, the screw conveyor of which is non-rotatably connected to the mixing element 5.
  • the screw pump 7 conveys in the direction of a pipe or hose 8 leading to the place of use.
  • the screw mixing device 4 and the screw pump 7 are therefore arranged coaxially one behind the other along an axis falling in the conveying direction, which includes an angle ⁇ between 10 ° and 30 ° with the horizontal.
  • the device is mounted on a chassis 10, which is only indicated symbolically.
  • the elastic intermediate piece 2 is released either from the silo outlet 1 or from the shaft 3.
  • the hopper 3 has a wall 3b which acts as a slide.
  • This wall 3b which runs essentially transversely to the conveying direction and is adjacent to the motor 6, therefore encloses an angle ⁇ with the vertical, for example in the range from 30 ° to 50 °.
  • the filling opening in the lid 3a of the funnel 3 is located above the wall 3b, so that the dry mortar first meets the wall 3b from above and then slides downwards into the screw mixing device 4.
  • the mixing element 5 is first conveyed by the mixing element 5 in the direction of a water inlet symbolized by a connecting piece 11, then mixed thoroughly with water and supplied to the screw pump 7 partly under the influence of the mixing element 5 and partly under the influence of gravity. Meanwhile, over the water connection piece 11 and a symbolically illustrated line 12 water from a metering device 13 continuously fed in metered amount.
  • the metering device 13 which can be of any known type, is connected to the local water network via a solenoid valve 14, which can also be designed as a pressure reducing valve.
  • an electrical control cabinet 15 which controls the entire device, in particular as a function of the output signal of a level detector 16 arranged at or in the hopper 3 at a suitable location.
  • a level detector 16 arranged at or in the hopper 3 at a suitable location.
  • the level indicator 16 can e.g. trigger the activation of a vibrator in the silo above or the opening of a slide at the silo outlet if the specified fill level is undershot.
  • the device according to FIG. 1 can be used to produce plaster or masonry mortar as well as liquid screed. This is achieved through the use of specially designed mixing elements which are adapted to the respective material and which are very easily interchangeable, together with the replacement of the screw pump 7 which is necessary in any case and which, in the case of the production of plaster or masonry mortar, must be considerably more efficient than in the case of the production of self-leveling screed, since the latter has a thinner consistency than, for example, spray plaster.
  • the drive unit consisting of the electric motor 6 and the gear 6a is pivotally connected to the housing of the screw mixing device 4 (not shown).
  • the mixing element 5 shown in Figures 1 and 2 is used to produce plaster or masonry mortar.
  • it comprises a first section 51 made of a continuous screw 50 with approximately 31 ⁇ 2 turns and a second section 52 of approximately the same length made up of segments 53 of a screw with a larger pitch than the first mentioned screw.
  • a particularly good mixing effect is achieved due to the relatively large pitch of the screw segments 53 of the second section 52.
  • the preferably periodic gaps 54 prevent this large slope from causing a correspondingly high conveying speed in the axial direction. If the conveying speed is too high, the mixing time would be too short to achieve homogeneous mixing.
  • an axial web 55 which connects the peripheral edges of axially successive segments 53 and forms a wall scraper.
  • the first section 51 corresponds essentially to the dry area of the screw mixing device 4
  • the second section 52 corresponds to the wet area.
  • the mixing element 9 shown in FIG. 3, on the other hand, is used to produce liquid screed. It also includes two functionally different sections.
  • the first section 51 has individual, flat mixing vanes 90, which are each set against the radial plane around an angle (which, as in the case of FIG. 2, runs from right to left) and the desired conveying speed.
  • This is followed by the second section 92, which corresponds to the wet area and consists of similar mixing blades 93, each of which two adjacent mixing blades lying in the same axial plane form a pair, the peripheral areas thereof are connected via an axial web 95.
  • a total of four such webs 95 are provided, which are arranged distributed uniformly over the circumference of the mixing element 9 and are offset by one web length in the axial direction.
  • the function of the webs 95 corresponds to that of the web 55 in FIG. 2.
  • the intermediate spaces 94 between the mixing blades 90 to 93 which are large in comparison to FIG in Figure 1.
  • FIG. 4 shows a further development of the device according to FIG. 1.
  • This further developed device is used for the production of pumpable mortar from binder and sand, in particular for the production of liquid screed. Therefore, the screw mixing device 4 is equipped here with the mixing element 9 according to FIG. 3. All other parts of the device, already shown in FIG. 1, are provided with the same reference numerals as there.
  • the device according to FIG. 1 is charged with ready-to-use dry mortar via its filling shaft 3
  • the device according to FIG. 4 is primarily intended for the construction site-based production of a pumpable mortar mass, here liquid screed, from binder and sand.
  • the binder comes from a silo to be presented above the funnel-shaped outlet 1.
  • the sand comes from the construction site and is added via a sand feed hopper 20, the tubular neck 20a of which opens into the jacket of the screw mixing device 4 above an opening 4a.
  • the opening 4a is located downstream of the water connection piece in the conveying direction 11.
  • the funnel 20 is detachably mounted on a box-shaped attachment 21.
  • the sand is fed to the hopper 20 by means of a metering conveyor belt 22 which is known only as a symbol and which discharges sand from a generally funnel-shaped loading shaft 23 in an amount which can be adjusted via an orifice 23a which is adjustable in the direction of the double arrow shown.
  • the metering conveyor belt 22 is supported with its discharge end on a holder 24 which is rotatably arranged (not shown) on the upper edge of the hopper 20 and also carries a gear motor 25 which drives a sand screw conveyor 26 arranged in the funnel neck 20a.
  • This has a web 26a on its inlet side, which extends at a short distance parallel to the inner wall of the sand feed hopper 20 and, since it rotates with the sand conveyor screw 26, acts as a sand scraper.
  • the speed of the geared motor 25 and thus the screw conveyor 26 is selected so that the desired mixing ratio of e.g. 1: 1 from binder to sand. This speed can be 40 to 60 rpm, while the speed of the drive unit 6, 6a, which supplies the binder, can have a value of, for example, between 200 and 400 rpm.
  • the amount of sand supplied to the sand feed hopper 20 via the metering conveyor belt 22 is adjusted so that sufficient sand is constantly present in the latter.
  • the improved device according to FIG. 4 can of course also be loaded with ready-to-use pre-mixed dry mortar.
  • the parts described above for feeding sand are then inoperative.
  • the sand loading hopper 20 can remain in place or can be detached from the attachment 21 and closed by a corresponding cover.

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  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Finishing Walls (AREA)
  • Cell Separators (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

A screw mixing device (4) which can be charged with dry material is followed coaxially by a screw pump (7). The screw mixing device (4) and the screw pump (7) have a common drive unit (6, 6a). The common axis, directed obliquely upwards in the conveying direction, encloses an angle of between 10 DEG and 30 DEG with the horizontal. The mixing element (5) of the screw mixing device has a first section designed essentially for conveying the dry material as far as a water connector (11) and a second section designed for mixing the dry material with the water. The dry material may be dry mortar or only binder. In the latter case, the screw mixing device (4) has, at the level of its second section, an opening at the top for charging with sand. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zur baustellenseitigen Herstellung von pumpfähigen Mörtelmassen, bestehend aus einer Schneckenmischvorrichtung, der über einen Einfülltrichter Trockenmaterial und über einen in Förderrichtung auf den Einfülltrichter folgenden Anschlußstutzen eine dosierte Wassermenge jeweils kontinuierlich zuführbar sind, und aus einer der Schneckenmischvorrichtung nachgeschalteten Schneckenpumpe.The invention relates to a device for the on-site production of pumpable mortar compositions, consisting of a screw mixing device which can be supplied with a metered amount of water continuously via a filling hopper dry material and a connecting piece following the feeding hopper in the conveying direction, and from a screw pump connected downstream of the screw mixing device.

Eine derartige Vorrichtung wurde diesseits mit der nicht vorveröffentlichten deutschen Patentanmeldung P 41 19 261.3 vorgeschlagen. Sie wird mit Trockenmörtel beschickt, der, abgesehen von der noch notwendigen, in der Vorrichtung erfolgenden Wasserzugabe, verwendungsfertig vorgemischt ist und unterscheidet sich von dem vorbekannten Stand der Technik dadurch, daß sie pumpfähige Mörtelmassen kontinuierlich zu liefern vermag. Hierzu umfaßt die Schneckenmischvorrichtung mehrere Mischzonen, nämlich einen gleichachsig zu der Schneckenpumpe angeordneten Schneckenmischer, der gemeinsam mit der Schneckenpumpe angetrieben wird, sowie oberhalb und parallel zu dieser Einheit einen gegensinnig dazu arbeitenden Schneckenförderer, der zwischen seiner mit dem Trockenmörtel beschickbaren Einlaßöffnung und seiner mit der darunter angeordneten Einheit verbundenen Auslaßöffnung ein Schneckenorgan hat, das aus der Aufeinanderfolge einer Förderschnecke, einer Dosierschnecke und einer Vormischschnecke auf einer gemeinsamen Welle besteht.Such a device was proposed on this side with the unpublished German patent application P 41 19 261.3. It is charged with dry mortar which, apart from the water addition still required in the device, is premixed ready for use and differs from the known prior art in that it is capable of delivering pumpable mortar compositions continuously. For this purpose, the screw mixing device comprises several mixing zones, namely a screw mixer arranged coaxially with the screw pump, which is driven together with the screw pump, and above and parallel to this unit, a screw conveyor working in opposite directions, between its inlet opening, which can be filled with dry mortar, and its one below arranged unit connected outlet opening has a worm member, which consists of the succession of a screw conveyor, a metering screw and a There is a premix screw on a common shaft.

Gesteuert von entsprechenden Füllstandsmeldern bei gleichzeitiger dosierter Wasserzufuhr liefert die beschriebene Vorrichtung in erster Linie Fließestrich gleichbleibender Konsistenz. Sofern allerdings mit dieser Vorrichtung Putz- oder Mauermörtel, der im Vergleich zu Fließestrich wesentlich dickflüssiger ist, hergestellt werden soll, sind neben einem Austausch der Schneckenpumpe gegen ein entsprechend leistungsfähigeres Aggregat weitere Umbauten, nämlich ein Austausch aller vorgeordneten Mischorgane gegen solche anderer Bauart erforderlich.Controlled by appropriate level indicators with a simultaneous metered supply of water, the device described primarily provides liquid screed with a consistent consistency. If, however, plaster or masonry mortar, which is much thicker than liquid screed, is to be produced with this device, in addition to replacing the screw pump with a correspondingly more powerful unit, further conversions are required, namely an exchange of all upstream mixing elements for other types.

Der Erfindung liegt die Aufgabe zugrunde, die Vorrichtung der einleitend angegebenen Gattung sowie deren Umbau von der Herstellung von Fließestrich auf die Erzeugung von Putz- und Mauermörtel und umgekehrt zu vereinfachen.The invention has for its object to simplify the device of the type specified in the introduction and its conversion from the production of self-leveling screed to the production of plaster and masonry mortar and vice versa.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß die Schneckenmischvorrichtung und die Schneckenpumpe gleichachsig hintereinander längs einer in Förderrichtung fallenden Achse angeordnet sind, die mit der Horizontalen einen Winkel zwischen 10° und 30° einschließt, daß die Schneckenmischvorrichtung und die Schneckenpumpe ein gemeinsames Antriebsaggregat haben und daß das Mischorgan der Schneckenmischvorrichtung lediglich zwei Abschnitte umfaßt, von denen der erste Abschnitt im wesentlichen für die Förderung des als Trockenmörtel zugegebenen Trockenmaterials bis zu dem Wasseranschlußstutzen und der zweite Abschnitt für die Mischung des Trockenmörtels mit dem Wasser ausgebildet sind.This object is achieved in that the screw mixing device and the screw pump are arranged coaxially one behind the other along an axis falling in the conveying direction, which includes an angle with the horizontal between 10 ° and 30 °, that the screw mixing device and the screw pump have a common drive unit and that the mixing element of the screw mixing device comprises only two sections, of which the first section is essentially designed for conveying the dry material added as dry mortar to the water connection piece and the second section for mixing the dry mortar with the water.

Die vorgeschlagene Vorrichtung ist mithin wesentlich einfacher aufgebaut als die Vorrichtung der einleitend angegebenen Art. Insbesondere genügt zum Mischen und Pumpen ein einziger (Getriebe-) Antriebsmotor. Des weiteren vereinfacht sich die Umrüstung der Vorrichtung von der Herstellung von Fließestrich auf die Herstellung von Putz- und Mauermörtel (und umgekehrt) ganz erheblich. Zusätzlich zu dem ohnehin erforderlichen Austausch der Schneckenpumpe braucht nur noch das einzige Mischorgan ausgewechselt zu werden.The proposed device is therefore much simpler in construction than the device of the type specified in the introduction. In particular, a single (gear) drive motor is sufficient for mixing and pumping. Furthermore The retrofitting of the device from the production of self-leveling screed to the production of plaster and masonry mortar (and vice versa) is considerably simplified. In addition to the replacement of the screw pump, which is necessary anyway, only the single mixing element needs to be replaced.

Die vorgeschlagene Vorrichtung ist wegen ihres einfachen Aufbaus besonders leicht transportabel. Bei einer praxisgerechten Ausführungsform läuft das Mischorgan mit einer Drehzahl von 150 bis 300 U/min und die Schneckenpumpe liefert 70 bis 100 Liter Mörtelmasse pro Minute.The proposed device is particularly easy to transport because of its simple structure. In a practical embodiment, the mixing element runs at a speed of 150 to 300 rpm and the screw pump delivers 70 to 100 liters of mortar mass per minute.

Eine vorteilhafte Weiterbildung der Vorrichtung, die sowohl deren Reinigung als auch deren Umrüstung beschleunigt, ist im Anspruch 2 angegeben.An advantageous further development of the device, which speeds up both cleaning and retrofitting, is specified in claim 2.

Durch die Ausführungsform nach Anspruch 3 wird eine besonders gleichmäßige Beschickung des Mischorgans mit dem Trockenmörtel erreicht und dadurch die Mischgüte verbessert.The embodiment according to claim 3 achieves a particularly uniform loading of the mixing element with the dry mortar and thereby improves the mixing quality.

Die Ausführungsform nach Anspruch 4 bezieht sich auf die Ausgestaltung des Mischorgans zur Herstellung von Spritzputz (oder Mauermörtel).The embodiment according to claim 4 relates to the design of the mixing element for the production of spray plaster (or masonry mortar).

Demgegenüber bezieht sich die Ausführungsform nach Anspruch 5 auf die Ausgestaltung des Mischorgans zur Herstellung von im Verhältnis zu Putz- oder Mauermörtel wesentlich dünnflüssigerem Fließestrich.In contrast, the embodiment according to claim 5 relates to the design of the mixing element for the production of liquid screed which is considerably thinner in comparison to plaster or masonry mortar.

Die Vorrichtung nach den Ansprüchen 1 bis 5 benötigt verwendungsfertig mit Sand vorgemischtes Trockenmaterial, das z.B. aus einem auf der Baustelle aufgestellten Silo stammt, unter dessen Auslauf die Vorrichtung mit ihrem Einfülltrichter positioniert ist. Unter anderem wegen der Transportkosten ist allerdings dieses verwendungsfertig angelieferte, zu etwa 50% aus Sand bestehende Trockenmaterial teurer als auf der Baustelle im selben Verhältnis aus Sand und Bindemittel (z.B. Rezepturen auf der Basis von Zement und/oder Anhydrit) hergestellte Mörtelmassen.The device according to claims 1 to 5 requires ready-to-use dry material premixed with sand, which comes, for example, from a silo installed on the construction site, under the outlet of which the device with its filling funnel is positioned. Because of the transport costs, among other things, this is delivered ready-to-use, consisting of approximately 50% sand Dry material is more expensive than mortar masses produced on site in the same ratio of sand and binding agent (e.g. recipes based on cement and / or anhydrite).

Der Erfindung liegt daher die weitere Aufgabe zugrunde, die vorgeschlagene Vorrichtung dahingehend zu verbessern, daß sie wahlweise auch zur Herstellung von pumpfähigen Mörtelmassen, insbesondere Fließestrich, aus trockenem Bindemittel und getrennt davon zugegebenem Sand verwendet werden kann.The invention is therefore based on the further object of improving the proposed device to the effect that it can optionally also be used to produce pumpable mortar compositions, in particular liquid screed, from dry binder and sand added separately therefrom.

Diese Aufgabe ist bei einer Vorrichtung der einleitend angegebenen Gattung dadurch gelöst, daß die Schneckenmischvorrichtung und die Schneckenpumpe gleichachsig hintereinander längs einer in Förderrichtung fallenden Achse angeordnet sind, die mit der Horizontalen einen Winkel zwischen 10° und 30° einschließt, daß die Schneckenmischvorrichtung und die Schneckenpumpe ein gemeinsames Antriebsaggregat haben, daß das Mischorgan der Schneckenmischvorrichtung zwei Abschnitte umfaßt, von denen der erste Abschnitt im wesentlichen für die Förderung des als Bindemittel zugegebenen Trockenmaterials bis zu dem Wasseranschlußstutzen und der zweite Abschnitt für die Mischung des Bindemittels mit dem Wasser ausgebildet sind, und daß die Schneckenmischvorrichtung in Höhe des zweiten Abschnitts ihres Mischorgans in ihrem rohrförmigen Mantel oberseitig eine Öffnung zur Beschickung mit Sand hat.This object is achieved in a device of the type specified in the introduction in that the screw mixing device and the screw pump are arranged coaxially one behind the other along an axis falling in the conveying direction, which includes an angle between 10 ° and 30 ° with the horizontal, that the screw mixing device and the screw pump have a common drive unit, that the mixing element of the screw mixing device comprises two sections, the first section of which is essentially designed for conveying the dry material added as a binder up to the water connection socket and the second section for mixing the binder with the water, and that the screw mixing device at the level of the second section of its mixing element has an opening on its upper side in its tubular jacket for loading with sand.

Diese Vorrichtung kann in der gleichen Weise weiter ausgestaltet sein, wie zuvor unter Bezugnahme auf die Ansprüche 2 bis 5 für die Vorrichtung nach dem Anspruch 1 angegeben.This device can be further configured in the same manner as indicated above with reference to claims 2 to 5 for the device according to claim 1.

Es hat sich gezeigt, daß die Vorrichtung sich besonders zur Herstellung von Fließestrich aus Bindemittel, Wasser und getrennt davon nachfolgend in die Mischzone eingebrachtem Sand eignet. Dementsprechend wird als Mischorgan dasjenige nach Anspruch 5 bevorzugt. Dieser erfinderischen Verbesserung der zuvor erläuterten, mit verwendungsfertig mit Sand vorgemischtem Trockenmaterial arbeitenden Vorrichtung liegt die Erkenntnis zugrunde, daß dann, wenn der Durchsatz (die Förderleistung) der Schneckenpumpe größer ist als die Förderleistung der vorgeordneten Mischvorrichtung, die Mischzone nur teilweise mit Material gefüllt ist. Die Mischzone enthält also luftgefüllte Hohlräume, häufig in Form voneinander getrennter Luftpolster, die sich mit der benötigten Sandmenge gewissermaßen auffüllen lassen. Überraschend ist, daß sich auf diese Weise trotz der sehr kurzen Mischstrecke eine homogene, pumpfähige Mörtelmasse erzeugen läßt. Grundsätzlich lassen sich die für die Einspeisung des Sandes benötigten Lufthohlräume dadurch schaffen, daß die bei gegebener Antriebsdrehzahl der gemeinsamen Welle der Schneckenmischvorrichtung und der Schneckenpumpe einen aus Trockenmörtel und Wasser erzeugten, kontinuierlichen Strom an Mörtelmasse liefernde Schneckenpumpe gegen eine solche höherer Förderleistung ausgetauscht wird. Vorteilhafter ist es jedoch, lediglich die Antriebsdrehzahl entsprechend zu erhöhen. Es hat sich nämlich gezeigt, daß von einer bestimmten Drehzahl an die aus dem Einfülltrichter in die Schneckenmischvorrichtung geförderte Materialmenge - entgegen dem, was man erwarten würde - im wesentlichen konstant bleibt, insbesondere wenn es sich um sehr feinkörniges Material handelt, so daß durch eine Steigerung der Drehzahl lediglich die Förderleistung der Schneckenpumpe erhöht wird, wodurch die benötigten Luftzwischenräume geschaffen werden. Je nach Auslegung des Durchmessers der Schneckenmischvorrichtung und der geometrischen Form deren Mischorgans tritt der genannte Effekt z.B. bei einer Drehzahl von 200 U/min ein, so daß eine Steigerung der Drehzahl über diesen Wert zu den angestrebten Luftpolstern in dem Bindemittel/Wasser-Gemisch führt.It has been shown that the device is particularly suitable for the production of self-leveling screed from binder, water and subsequently introduced into the mixing zone Sand is suitable. Accordingly, the mixing device according to claim 5 is preferred. This inventive improvement of the device explained above, which works with dry material premixed with dry material, is based on the knowledge that when the throughput (the delivery rate) of the screw pump is greater than the delivery rate of the upstream mixing device, the mixing zone is only partially filled with material. The mixing zone thus contains air-filled cavities, often in the form of separate air cushions, which can be filled to a certain extent with the required amount of sand. It is surprising that a homogeneous, pumpable mortar mass can be produced in this way despite the very short mixing section. Basically, the air cavities required for feeding the sand can be created by replacing the worm pump produced from dry mortar and water with a given drive speed of the common shaft of the worm mixing device and the worm pump for such a higher delivery rate. However, it is more advantageous to increase the drive speed accordingly. It has been shown that, from a certain speed, the amount of material conveyed from the hopper into the screw mixing device - contrary to what one would expect - remains essentially constant, especially if the material is very fine-grained, so that an increase the speed only increases the delivery rate of the screw pump, creating the required air gaps. Depending on the design of the diameter of the screw mixing device and the geometric shape of its mixing element, the above-mentioned effect occurs, for example, at a speed of 200 rpm, so that an increase in the speed above this value leads to the desired air cushions in the binder / water mixture.

Gemäß dem Anspruch 7 ist oberhalb der in dem Mantel der Schneckenmischvorrichtung vorgesehenen Sandbeschickungsöffnung ein Sandbeschickungstrichter angeordnet.According to claim 7, a sand feed hopper is arranged above the sand loading opening provided in the casing of the screw mixing device.

Die benötigte Sandmenge kann in den Sandbeschickungstrichter geschaufelt werden. Ein gleichbleibendes Mischungsverhältnis läßt sich dadurch jedoch nur schlecht erzielen. Deshalb wird gemäß Anspruch 8 bevorzugt, daß der Sandbeschickungstrichter einen rohrförmigen Trichterhals hat, und daß in dem Trichterhals eine Sandförderschnecke vorgesehen ist, die mittels eines oberhalb des Sandbeschickungstrichters angeordneten Getriebemotors antreibbar ist. Mit der Sandförderschnecke kann ein dem Verlauf der Trichterinnenwand folgender Sandschaber oder ein anderes Rührorgan kombiniert sein, das dafür sorgt, daß der ggf. feuchte Sand gleichmäßig nachsackt. Die Drehzahl der Sandförderschnecke wird so festgelegt, daß sie das gewünschte Mischungsverhältnis, z.B. 1 : 1, von Bindemittel zu Sand ergibt.The required amount of sand can be shoveled into the sand feed hopper. However, it is difficult to achieve a constant mixture ratio. It is therefore preferred according to claim 8 that the sand feed hopper has a tubular funnel neck and that a sand conveyor screw is provided in the funnel neck, which can be driven by means of a gear motor arranged above the sand feed hopper. A sand scraper following the course of the inner wall of the funnel or another stirring element can be combined with the sand screw conveyor, which ensures that the possibly moist sand sags evenly. The speed of the screw conveyor is determined so that it has the desired mixing ratio, e.g. 1: 1, from binder to sand.

Der Sandbeschickungstrichter kann in beliebiger Weise, z.B. auch selbsttätig aus einem Silo unter Verwendung an sich bekannter Füllstandsmelder in dem Trichter mit Sand gefüllt gehalten werden. Eine einfachere Möglichkeit ist im Anspruch 9 angegeben und sieht vor, daß an der Einlauföffnung des Sandbeschickungstrichters ein Dosierförderband für den Sand endet. Geeignete Dosierförderbänder sind an sich bekannt. Sie haben auf der Aufgabeseite einen Schacht, in den der Sand z.B. eingeschaufelt wird. Über einen Spalt einstellbaren Querschnitts läßt sich die von dem mit konstanter Geschwindigkeit laufenden Band je Zeiteinheit abtransportierte Sandmenge einstellen.The sand feed hopper can be used in any way, e.g. can also be kept automatically from a silo using fill level sensors known per se in the funnel filled with sand. A simpler option is specified in claim 9 and provides that a metering conveyor belt for the sand ends at the inlet opening of the sand feed hopper. Suitable metering conveyor belts are known per se. On the feed side you have a shaft into which the sand e.g. is shoveled. The amount of sand transported away from the belt running at a constant speed per unit of time can be adjusted via a gap which can be adjusted.

Es empfiehlt sich, das Abgabeende des Dosierförderbandes mit dem Sandeinfülltrichter verbindbar auszubilden. Dies ist gemäß Anspruch 10 in der Weise möglich, daß der Sandbeschickungstrichter mit lotrechter Mittelachse angeordnet ist und eine um seine Mittelachse drehbare Halterung für das Abgabeende des Dosierförderbandes trägt, an der auch der Getriebemotor für die Sandförderschnecke montiert ist. Die Halterung kann somit in die sich nach den örtlichen Gegebenheiten richtende Stellung gebracht werden, in der sich das Dosierförderband befindet.It is advisable to make the discharge end of the metering conveyor belt connectable to the sand filling funnel. This is possible according to claim 10 in such a way that the sand feed hopper is arranged with a vertical central axis is and carries a bracket rotatable about its central axis for the discharge end of the metering conveyor belt, on which the gear motor for the sand conveyor screw is also mounted. The holder can thus be brought into the position depending on the local conditions in which the metering conveyor belt is located.

In der Zeichnung sind die Vorrichtungen nach der Erfindung in beispielsweise gewählten Ausführungsformen schematisch vereinfacht dargestellt. Es zeigt:

Fig. 1
eine teilweise im Schnitt gehaltene Seitenansicht einer Vorrichtung, die zur Beschickung mit Trockenmörtel ausgebildet ist,
Fig. 2
ein für die Herstellung von Spritzputz oder Mauermörtel geeignetes Mischorgan für die Vorrichtung nach Fig. 1,
Fig. 3
ein für die Herstellung von Fließestrich geeignetes Mischorgan für die Vorrichtung nach Fig. 1, und
Fig. 4
eine der Darstellung in Fig. 1 entsprechende Seitenansicht einer weiterentwickelten Vorrichtung, die auch wahlweise mit Bindemittel und Sand beschickt werden kann.
In the drawing, the devices according to the invention are shown schematically simplified in, for example, selected embodiments. It shows:
Fig. 1
FIG. 2 shows a side view, partly in section, of a device which is designed for charging with dry mortar,
Fig. 2
a mixing element suitable for the production of spray plaster or masonry mortar for the device according to FIG. 1,
Fig. 3
a suitable for the production of liquid screed mixing element for the device of FIG. 1, and
Fig. 4
a side view corresponding to the representation in Fig. 1 of a further developed device, which can also be optionally loaded with binder and sand.

Bei der Vorrichtung nach Fig. 1 ist der trichterförmige Auslauf 1 eines im übrigen nicht dargestellten Trockenmörtelsilos über ein elastisches Zwischenstück 2, z.B. einen kurzen Schlauchabschnitt oder einen elastischen Balg, mit einer Öffnung im Deckel 3a eines Einfülltrichters 3 verbunden, der in eine Schneckenmischvorrichtung 4 mündet. Die Schneckenmischvorrichtung 4 enthält ein Mischorgan 5, das in Figur 2 dargestellt, jedoch wahlweise auch gegen das in Figur 3 wiedergegebene Mischorgan 9 auswechselbar ist. Das Mischorgan 5 ist über einen nur schematisch angedeuteten Elektromotor 6 mit nachgeschaltetem Getriebe 6a mit einer konstanten Drehzahl von einigen Hundert Umdrehungen Pro Minute antreibbar. An die Ausgangsseite der Schneckenmischvorrichtung 4 ist eine Schneckenpumpe 7 an sich bekannte Bauart angeflanscht, deren Förderschnecke drehfest mit dem Mischorgan 5 verbunden ist. Die Schneckenpumpe 7 fördert in Richtung einer Rohr- oder Schlauchleitung 8, die zum Verwendungsort führt. Die Schneckenmischvorrichtung 4 und die Scheckenpumpe 7 sind mithin gleichachsig hintereinander längs einer in Förderrichtung fallenden Achse angeordnet, die mit der Horizontalen einen Winkel α zwischen 10° und 30° einschließt.In the device according to FIG. 1, the funnel-shaped outlet 1 of a dry mortar silo, which is otherwise not shown, is connected via an elastic intermediate piece 2, for example a short hose section or an elastic bellows, to an opening in the lid 3a of a filling funnel 3, which opens into a screw mixing device 4 . The screw mixing device 4 contains a mixing element 5, which is shown in FIG. 2, but is optional can also be exchanged for the mixing element 9 shown in FIG. 3. The mixing element 5 can be driven by means of an electric motor 6, which is only indicated schematically, with a transmission 6a connected at a constant speed of a few hundred revolutions per minute. On the output side of the screw mixing device 4, a screw pump 7 of known type is flanged, the screw conveyor of which is non-rotatably connected to the mixing element 5. The screw pump 7 conveys in the direction of a pipe or hose 8 leading to the place of use. The screw mixing device 4 and the screw pump 7 are therefore arranged coaxially one behind the other along an axis falling in the conveying direction, which includes an angle α between 10 ° and 30 ° with the horizontal.

Die Vorrichtung ist insgesamt auf einem nur symbolisch angedeuteten Fahrgestell 10 montiert. Zum Transport wird das elastische Zwischenstück 2 entweder von dem Siloauslauf 1 oder von dem Schacht 3 gelöst.Overall, the device is mounted on a chassis 10, which is only indicated symbolically. For transport, the elastic intermediate piece 2 is released either from the silo outlet 1 or from the shaft 3.

Um zu verhindern , daß der Trockenmörtel aus dem Silo direkt in die Schneckenmischvorrichtung 4 fällt (was zu Betriebsstörungen führen könnte), hat der Trichter 3 eine als Rutsche wirkende Wand 3b. Diese im wesentlichen quer zur Förderrichtung verlaufende, dem Motor 6 benachbarte Wand 3b schließt daher mit der Senkrechten einen Winkel β z.B. im Bereich von 30° bis 50° ein. Die Einfüllöffnung im Deckel 3a des Trichters 3 befindet sich oberhalb der Wand 3b, so daß der Werktrockenmörtel von oben zunächst auf die Wand 3b trifft und sodann längs dieser abwärts in die Schneckenmischvorrichtung 4 gleitet. Dort wird er durch das Mischorgan 5 zunächst in Richtung eines durch einen Anschlußstutzen 11 symbolisierten Wasserzulaufes gefördert, sodann gründlich mit Wasser durchgemischt und teils unter dem Einfluß des Mischorgans 5, teils unter dem Einfluß der Schwerkraft der Schneckenpumpe 7 zugeführt. Währenddessen wird über den Wasseranschlußstutzen 11 und eine symbolisch dargestelle Leitung 12 Wasser aus einer Dosiervorrichtung 13 kontinuierlich in dosierter Menge eingespeist. Die Dosiervorrichtung 13, die von beliebiger bekannter Bauart sein kann, ist mit dem örtlichen Wassernetz über ein Magnetventil 14 verbunden, das gleichzeitig als Druckminderventil ausgebildet sein kann.In order to prevent the dry mortar from falling from the silo directly into the screw mixing device 4 (which could lead to malfunctions), the hopper 3 has a wall 3b which acts as a slide. This wall 3b, which runs essentially transversely to the conveying direction and is adjacent to the motor 6, therefore encloses an angle β with the vertical, for example in the range from 30 ° to 50 °. The filling opening in the lid 3a of the funnel 3 is located above the wall 3b, so that the dry mortar first meets the wall 3b from above and then slides downwards into the screw mixing device 4. There it is first conveyed by the mixing element 5 in the direction of a water inlet symbolized by a connecting piece 11, then mixed thoroughly with water and supplied to the screw pump 7 partly under the influence of the mixing element 5 and partly under the influence of gravity. Meanwhile, over the water connection piece 11 and a symbolically illustrated line 12 water from a metering device 13 continuously fed in metered amount. The metering device 13, which can be of any known type, is connected to the local water network via a solenoid valve 14, which can also be designed as a pressure reducing valve.

Neben der Dosiervorrichtung 13 ist symbolisch ein elektrischer Schaltschrank 15 angedeutet, der die Gesamtvorrichtung steuert, insbesondere in Abhängigkeit von dem Ausgangssignal eines an bzw. in dem Trichter 3 an geeigneter Stelle angeordneten Füllstandsmelders 16. Dieser sorgt dafür, daß der Trichter 3 ständig ausreichend mit Trockenmörtel gefüllt ist. Hierzu kann der Füllstandsmelder 16 z.B. das Einschalten eines Rüttlers in dem darüber befindlichen Silo oder das Öffnen eines Schiebers am Siloauslauf auslösen, wenn der vorgegebene Füllstand unterschritten ist. Diese Einzelheiten sind, da an sich bekannt und nicht zur Erfindung gehörig, nicht dargestellt.In addition to the metering device 13, an electrical control cabinet 15 is symbolically indicated, which controls the entire device, in particular as a function of the output signal of a level detector 16 arranged at or in the hopper 3 at a suitable location. This ensures that the hopper 3 is constantly adequately filled with dry mortar is filled. For this purpose, the level indicator 16 can e.g. trigger the activation of a vibrator in the silo above or the opening of a slide at the silo outlet if the specified fill level is undershot. These details are not shown since they are known per se and are not part of the invention.

Trotz ihres einfachen Aufbaus kann mit der Vorrichtung nach Figur 1 Putz- oder Mauermörtel ebensogut wie Fließestrich hergestellt werden. Dies gelingt durch die Verwendung von an das jeweilige Material angepaßten, speziell gestalteten Mischorganen, die sehr leicht gegeneinander austauschbar sind, zusammen mit dem in jedem Falle erforderlichen Auswechseln der Schneckenpumpe 7, die im Falle der Herstellung von Putz- oder Mauermörtel wesentlich leistungsfähiger sein muß als im Fall der Herstellung von Fließestrich, da letzterer von dünnflüssigerer Konsistenz als z.B. Spritzputz ist. Zur leichten Auswechselbarkeit des Mischorgans ist das aus dem Elektromotor 6 und dem Getriebe 6a bestehende Antriebsaggregat abschwenkbar mit dem Gehäuse der Schneckenmischvorrichtung 4 verbunden (nicht dargestellt). Außerdem ist das Mischorgan sowohl mit der Welle des Antriebsaggregats als auch mit der Antriebsseite der Förderschnecke der Schneckenpumpe 7 über einfache Klauen kraftschüssig verbunden.Despite its simple structure, the device according to FIG. 1 can be used to produce plaster or masonry mortar as well as liquid screed. This is achieved through the use of specially designed mixing elements which are adapted to the respective material and which are very easily interchangeable, together with the replacement of the screw pump 7 which is necessary in any case and which, in the case of the production of plaster or masonry mortar, must be considerably more efficient than in the case of the production of self-leveling screed, since the latter has a thinner consistency than, for example, spray plaster. For easy replacement of the mixing element, the drive unit consisting of the electric motor 6 and the gear 6a is pivotally connected to the housing of the screw mixing device 4 (not shown). In addition, the mixing element with both the shaft of the drive unit as well as non-positively connected to the drive side of the screw conveyor of the screw pump 7 via simple claws.

Das in den Figuren 1 und 2 dargestellte Mischorgan 5 dient zur Herstellung von Putz- oder Mauermörtel. Es umfaßt hierzu gemäß Fig. 2 einen ersten Abschnitt 51 aus einer durchgehenden Schnecke 50 mit etwa 3½ Windungen sowie einen zweiten Abschnitt 52 etwa gleicher Länge aus Segmenten 53 einer Schnecke von gegenüber der erstgenannten Schnecke größerer Steigung. Durch die relativ große Steigung der Schneckensegmente 53 des zweiten Abschnitts 52 wird ein besonders guter Mischeffekt erzielt. Gleichzeitig verhindern die vorzugsweise periodischen Zwischenräume 54, daß diese große Steigung auch eine entsprechend große Fördergeschwindigkeit in axialer Richtung bewirkt. Durch eine zu hohe Fördergeschwindigkeit würde nämlich die Mischzeit zu kurz ausfallen, um eine homogene Durchmischung zu erreichen. Wichtig für die Funktion ist auch ein axialer Steg 55, der die Umfangsränder axial aufeinanderfolgender Segmente 53 verbindet und einen Wandschaber bildet. Der erste Abschnitt 51 entspricht im wesentlichen dem Trockenbereich der Schneckenmischvorrichtung 4, der zweite Abschnitt 52 deren Naßbereich.The mixing element 5 shown in Figures 1 and 2 is used to produce plaster or masonry mortar. For this purpose, according to FIG. 2, it comprises a first section 51 made of a continuous screw 50 with approximately 3½ turns and a second section 52 of approximately the same length made up of segments 53 of a screw with a larger pitch than the first mentioned screw. A particularly good mixing effect is achieved due to the relatively large pitch of the screw segments 53 of the second section 52. At the same time, the preferably periodic gaps 54 prevent this large slope from causing a correspondingly high conveying speed in the axial direction. If the conveying speed is too high, the mixing time would be too short to achieve homogeneous mixing. Also important for the function is an axial web 55, which connects the peripheral edges of axially successive segments 53 and forms a wall scraper. The first section 51 corresponds essentially to the dry area of the screw mixing device 4, the second section 52 corresponds to the wet area.

Das in Figur 3 dargestellte Mischorgan 9 dient demgegenüber zur Herstellung von Fließestrich. Es umfaßt ebenfalls zwei funktionell unterschiedliche Abschnitte. Der erste Abschnitt 51 hat einzelne, flache Mischflügel 90, die jeweils gegen die Radialebene um einen der (wie im Fall der Fig. 2 von rechts nach links verlaufenden) Förderrichtung und der angestrebten Fördergeschwindigkeit angepaßten Winkel angestellt sind. Hieran schließt sich der zweite Abschnitt 92 an, der dem Naßbereich entspricht und aus ähnlichen Mischflügeln 93 besteht, von denen jeweils zwei in der gleichen Axialebene liegende, benachbarte Mischflügel ein Paar bilden, dessen Umfangsbereiche über einen axialen Steg 95 verbunden sind. Insgesamt sind vier derartige Stege 95 vorgesehen, die gleichmäßig über den Umfang des Mischorgans 9 verteilt angeordnet sowie um je eine Steglänge in axialer Richtung versetzt sind. Die Funktion der Stege 95 entspricht derjenigen des Steges 55 in Figur 2. Die im Vergleich zu Figur 2 großen Zwischenräume 94 zwischen den Mischflügeln 90 bis 93 sind auf die relativ dünnflüssige Konsistenz von Fließestrich abgestellt, verhindern also einen zu hohen Druckaufbau am Eingang der Schneckenpumpe 7 in Figur 1.The mixing element 9 shown in FIG. 3, on the other hand, is used to produce liquid screed. It also includes two functionally different sections. The first section 51 has individual, flat mixing vanes 90, which are each set against the radial plane around an angle (which, as in the case of FIG. 2, runs from right to left) and the desired conveying speed. This is followed by the second section 92, which corresponds to the wet area and consists of similar mixing blades 93, each of which two adjacent mixing blades lying in the same axial plane form a pair, the peripheral areas thereof are connected via an axial web 95. A total of four such webs 95 are provided, which are arranged distributed uniformly over the circumference of the mixing element 9 and are offset by one web length in the axial direction. The function of the webs 95 corresponds to that of the web 55 in FIG. 2. The intermediate spaces 94 between the mixing blades 90 to 93, which are large in comparison to FIG in Figure 1.

An den beidseitigen Enden der Mischorgane 5 in Figur 2 und 9 in Figur 3 erkennt man die antriebs- und abtriebsseitigen Kupplungselemente in Form von steg- oder klauenartigen Mitnehmern 41 bzw. 42.At the ends of the mixing elements 5 in FIGS. 2 and 9 in FIG. 3 on both sides, the drive and output side coupling elements in the form of web-like or claw-like drivers 41 and 42 can be seen.

In Fig. 4 ist eine Weiterentwicklung der Vorrichtung nach Fig. 1 dargestellt. Diese weiterentwickelte Vorrichtung dient zur Herstellung von pumpfähigen Mörtelmassen aus Bindemittel und Sand, insbesondere zur Herstellung von Fließestrich. Deshalb ist die Schneckenmischvorrichtung 4 hier mit dem Mischorgan 9 gemäß Fig. 3 ausgestattet. Alle übrigen, bereits in Fig. 1 dargestellten Teile der Vorrichtung sind mit den gleichen Bezugszeichen wie dort versehen. Während jedoch die Vorrichtung nach Fig. 1 über ihren Einfüllschacht 3 mit verwendungsfertig vorgemischtem Trockenmörtel beschickt wird, ist die Vorrichtung nach Fig. 4 in erster Linie zur baustellenseitigen Herstellung einer pumpfähigen Mörtelmasse, hier Fließestrich, aus Bindemittel und Sand vorgesehen. Das Bindemittel kommt aus einem oberhalb des trichterförmigen Auslaufes 1 vorzustellenden Silo. Der Sand stammt von der Baustelle und wird über einen Sandbeschickungstrichter 20 zugegeben, dessen rohrförmiger Hals 20a oberhalb einer Öffnung 4a im Mantel der Schneckenmischvorrichtung 4 mündet. Die Öffnung 4a befindet sich in Förderrichtung stromab von dem Wasseranschlußstutzen 11.4 shows a further development of the device according to FIG. 1. This further developed device is used for the production of pumpable mortar from binder and sand, in particular for the production of liquid screed. Therefore, the screw mixing device 4 is equipped here with the mixing element 9 according to FIG. 3. All other parts of the device, already shown in FIG. 1, are provided with the same reference numerals as there. However, while the device according to FIG. 1 is charged with ready-to-use dry mortar via its filling shaft 3, the device according to FIG. 4 is primarily intended for the construction site-based production of a pumpable mortar mass, here liquid screed, from binder and sand. The binder comes from a silo to be presented above the funnel-shaped outlet 1. The sand comes from the construction site and is added via a sand feed hopper 20, the tubular neck 20a of which opens into the jacket of the screw mixing device 4 above an opening 4a. The opening 4a is located downstream of the water connection piece in the conveying direction 11.

Der Trichter 20 ist lösbar auf einem kastenförmigen Aufsatz 21 montiert.The funnel 20 is detachably mounted on a box-shaped attachment 21.

Der Sand wird dem Trichter 20 mittels eines nur symbolisch dargestellten, an sich bekannten Dosierförderbandes 22 zugeführt, das aus einem in der Regel trichterförmigen Beschickungsschacht 23 Sand in einer Menge abführt, die über eine in Richtung des dargestellten Doppelpfeiles verstellbare Blende 23a einstellbar ist. Das Dosierförderband 22 stützt sich mit seinem Abgabeende auf einer Halterung 24 ab, die drehbar (nicht dargestellt) auf dem Oberrand des Trichters 20 angeordnet ist und außerdem einen Getriebemotor 25 trägt, der eine in dem Trichterhals 20a angeordnete Sandförderschnecke 26 antreibt. Diese hat an ihrer Einlaufseite einen Steg 26a, der sich in geringem Abstand parallel zu der Innenwand des Sandbeschickungstrichters 20 erstreckt und, da er mit der Sandförderschnecke 26 umläuft, als Sandschaber wirkt. Die Drehzahl des Getriebemotors 25 und damit der Sandförderschnecke 26 ist so gewählt, daß sich das gewünschte Mischungsverhältnis von z.B. 1 : 1 von Bindemittel zu Sand ergibt. Diese Drehzahl kann bei 40 bis 60 U/min liegen, während die Drehzahl des Antriebsaggregats 6, 6a, das das Bindemittel zuführt, einen Wert von beispielsweise zwischen 200 bis 400 U/min haben kann. Die über das Dosierförderband 22 dem Sandbeschickungstrichter 20 zugeführte Sandmenge wird so eingestellt, daß in letzterem ständig genügend Sand vorhanden ist.The sand is fed to the hopper 20 by means of a metering conveyor belt 22 which is known only as a symbol and which discharges sand from a generally funnel-shaped loading shaft 23 in an amount which can be adjusted via an orifice 23a which is adjustable in the direction of the double arrow shown. The metering conveyor belt 22 is supported with its discharge end on a holder 24 which is rotatably arranged (not shown) on the upper edge of the hopper 20 and also carries a gear motor 25 which drives a sand screw conveyor 26 arranged in the funnel neck 20a. This has a web 26a on its inlet side, which extends at a short distance parallel to the inner wall of the sand feed hopper 20 and, since it rotates with the sand conveyor screw 26, acts as a sand scraper. The speed of the geared motor 25 and thus the screw conveyor 26 is selected so that the desired mixing ratio of e.g. 1: 1 from binder to sand. This speed can be 40 to 60 rpm, while the speed of the drive unit 6, 6a, which supplies the binder, can have a value of, for example, between 200 and 400 rpm. The amount of sand supplied to the sand feed hopper 20 via the metering conveyor belt 22 is adjusted so that sufficient sand is constantly present in the latter.

Die verbesserte Vorrichtung nach Fig. 4 kann selbstverständlich auch mit verwendungsfertig vorgemischtem Werktrockenmörtel beschickt werden. Die zuvor beschriebenen Teile für die Zuführung von Sand sind dann funktionslos. Der Sandbeschickungstrichter 20 kann an seinem Platz verbleiben oder von dem Aufsatz 21 gelöst und dieser durch einen entsprechenden Deckel verschlossen werden.The improved device according to FIG. 4 can of course also be loaded with ready-to-use pre-mixed dry mortar. The parts described above for feeding sand are then inoperative. The sand loading hopper 20 can remain in place or can be detached from the attachment 21 and closed by a corresponding cover.

Claims (10)

Vorrichtung zur baustellenseitigen Herstellung von pumpfähigen Mörtelmassen, bestehend aus einer Schneckenmischvorrichtung (4), der über einen Einfülltrichter (3) Trockenmaterial und über einen in Förderrichtung auf den Einfülltrichter folgenden Anschlußstutzen (11) eine dosierte Wassermenge jeweils kontinuierlich zuführbar sind, und aus einer der Schneckenmischvorrichtung (4) nachgeschalteten Schneckenpumpe (7), dadurch gekennzeichnet, daß die Schneckenmischvorrichtung (4) und die Schneckenpumpe (7) gleichachsig hintereinander längs einer in Förderrichtung fallenden Achse angeordnet sind, die mit der Horizontalen einen Winkel (α) zwischen 10° und 30° einschließt, daß die Schneckenmischvorrichtung (4) und die Schneckenpumpe (7) ein gemeinsames Antriebsaggregat (6, 6a) haben, und daß das Mischorgan (5; 9) der Schneckenmischvorrichtung zwei Abschnitte (51, 52; 91, 92) umfaßt, von denen der erste Abschnitt (51; 91) im wesentlichen für die Förderung des als Trockenmörtel zugegebenen Trockenmaterials bis zu dem Wasseranschlußstutzen (11) und der zweite Abschnitt (52; 92) für die Mischung des Trockenmörtels mit dem Wasser ausgebildet sind.Device for the production of pumpable mortar masses on site, consisting of a screw mixing device (4) which can be supplied with a metered amount of water continuously via a filling hopper (3) dry material and via a connecting piece (11) following the feeding hopper in the conveying direction, and from a screw mixing device (4) downstream screw pump (7), characterized in that the screw mixing device (4) and the screw pump (7) are arranged coaxially one behind the other along an axis falling in the conveying direction, which is at an angle (α) between 10 ° and 30 ° with the horizontal includes that the screw mixing device (4) and the screw pump (7) have a common drive unit (6, 6a) and that the mixing element (5; 9) of the screw mixing device comprises two sections (51, 52; 91, 92), one of which the first section (51; 91) essentially for the promotion of the as drying gates dry material added up to the water connection piece (11) and the second section (52; 92) are designed for mixing the dry mortar with the water. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Mischorgan (5; 9) der Schneckenmischvorrichtung (4) zur leichten Auswechselbarkeit mit der Welle der Schneckenpumpe (7) und mit der Welle des Antriebsaggregats (6, 6a) jeweils über Klauen (41, 42) in Eingriff steht, und daß das Antriebsaggregat (6, 6a) abschwenkbar oder rasch lösbar mit dem Gehäuse der Schneckenmischvorrichtung (4) verbunden ist.Device according to claim 1, characterized in that the mixing element (5; 9) of the screw mixing device (4) for easy interchangeability with the shaft of the screw pump (7) and with the shaft of the drive unit (6, 6a) each via claws (41, 42 ) is engaged, and that the drive unit (6, 6a) is pivotally or quickly detachably connected to the housing of the screw mixing device (4). Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die im wesentlichen quer zur Förderrichtung verlaufende, dem Antriebsaggregat (6, 6a) benachbarte Wand (3b) des Einfülltrichters (3) zur Zuführung des Trockenmaterials gegen die Senkrechte um einen Winkel (β) von ca. 30° bis 40° geneigt ist, so daß der Trichter (3) sich nach oben erweitert, und daß der Trichter (3) eine Einfüllöffnung hat, deren projizierte Fläche auf diese geneigte Wand (3b) fällt.Apparatus according to claim 1 or 2, characterized in that the wall (3b) of the hopper (3), which is essentially transverse to the conveying direction and is adjacent to the drive unit (6, 6a), for supplying the dry material against the vertical by an angle (β) of is inclined approximately 30 ° to 40 °, so that the funnel (3) widens upwards and that the funnel (3) has a filling opening, the projected area of which falls on this inclined wall (3b). Vorrichtung nach einem der Ansprüche 1 bis 3, zur Herstellung von Spritzputz, dadurch gekennzeichnet, daß der erste Abschnitt (91) des Mischorgans (5) aus einer durchgehenden Schnecke (50) mit zwei bis vier Windungen besteht, und daß der zweite Abschnitt (52) aus einer periodisch unterbrochenen Schnecke etwa gleicher Länge jedoch größerer Steigung mit zwei bis drei Windungen sowie einem axialen, die entsprechenden Umfangsbereiche axial aufeinanderfolgender Schneckensegmente (53) verbindenden, einen Wandschaber bildenden Steg (55) besteht.Device according to one of claims 1 to 3, for the production of spray plaster, characterized in that the first section (91) of the mixing element (5) consists of a continuous screw (50) with two to four turns, and in that the second section (52 ) consists of a periodically interrupted screw of approximately the same length but a larger pitch with two to three turns and an axial web (55) connecting the corresponding circumferential regions of axially successive screw segments (53) and forming a wall scraper. Vorrichtung nach einem der Ansprüche 1 bis 3, zur Herstellung von Fließestrich, dadurch gekennzeichnet, daß der erste Abschnitt (91) des Mischorgans (9) aus einzelnen, flachen Mischflügeln (90) besteht, die jeweils gegen die Radialebene um einen der Förderrichtung und der Fördergeschwindigkeit angepaßten Winkel angestellt sind, und daß der zweite Abschnitt (92) aus ähnlichen Mischflügeln (93) besteht, von denen jeweils zwei in der gleichen Axialebene liegende, benachbarte Flügel ein Paar bilden, dessen Umfangsbereiche über einen axialen Steg (95) verbunden sind, und daß mindestens zwei derartige Stege (95) um ca. 180° in Umfangsrichtung und vorzugsweise um eine Steglänge in axialer Richtung versetzt angeordnet sind.Device according to one of claims 1 to 3, for the production of liquid screed, characterized in that the first section (91) of the mixing element (9) consists of individual, flat mixing blades (90), each against the radial plane around one of the conveying direction and the Conveying speed adjusted angles are set, and that the second section (92) consists of similar mixing blades (93), of which two adjacent blades lying in the same axial plane form a pair, the peripheral regions of which are connected via an axial web (95), and that at least two such webs (95) are arranged offset by approximately 180 ° in the circumferential direction and preferably by a web length in the axial direction. Vorrichtung insbesondere nach dem Oberbegriff des Anspruches 1 und/oder nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß die Schneckenmischvorrichtung (4) und die Schneckenpumpe (7) gleichachsig hintereinander längs einer in Förderrichtung fallende Achse angeordnet sind, die mit der Horizontalen einen Winkel (α) zwischen 10° und 30° einschließt, daß die Schneckenmischvorrichtung (4) und die Schneckenpumpe (7) ein gemeinsames Antriebsaggregat (6, 6a) haben, daß das Mischorgan (5; 9) der Schneckenmischvorrichtung zwei Abschnitte (51, 52; 91, 92) umfaßt, von denen der erste Abschnitt (51; 91) im wesentlichen für die Förderung des als Bindemittel zugegebenen Trockenmaterials bis zu dem Wasseranschlußstutzen (11) und der zweite Abschnitt (52; 92) für die Mischung des Bindemittels mit dem Wasser ausgebildet sind, und daß die Schneckenmischvorrichtung (4) in Höhe des zweiten Abschnitts (52; 92) ihres Mischorgans (5; 9) in ihrem rohrförmigen Mantel oberseitig eine Öffnung (4a) zur Beschickung mit Sand hat.Device in particular according to the preamble of claim 1 and / or according to one of claims 2 to 5, characterized in that the screw mixing device (4) and the screw pump (7) are arranged coaxially one behind the other along an axis falling in the conveying direction, one with the horizontal Angle (α) between 10 ° and 30 ° includes that the screw mixing device (4) and the screw pump (7) have a common drive unit (6, 6a) that the mixing element (5; 9) of the screw mixing device has two sections (51, 52 ; 91, 92), of which the first section (51; 91) essentially for conveying the dry material added as a binder up to the water connection piece (11) and the second section (52; 92) for mixing the binder with the Water are formed, and that the screw mixing device (4) at the level of the second section (52; 92) of its mixing element (5; 9) in its tubular casing on the upper side ne opening (4a) for loading with sand. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß sich in die Sandbeschickungsöffnung (4a) ein Sandbeschickungstrichter (20) entleert.Apparatus according to claim 6, characterized in that a sand feed hopper (20) is emptied into the sand loading opening (4a). Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß der Sandbeschickungstrichter (20) einen rohrförmigen Trichterhals (20a) hat, und daß in dem Trichterhals 20a eine Sandförderschnecke (26) vorgesehen ist, die mittels eines oberhalb des Sandbeschickungstrichters (20) angeordneten Getriebemotors (25) antreibbar ist.Apparatus according to claim 7, characterized in that the sand feed hopper (20) has a tubular funnel neck (20a) and that a sand conveyor screw (26) is provided in the funnel neck 20a, which is arranged by means of a gear motor (25) arranged above the sand feed hopper (20). is drivable. Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß an der Einlauföffnung des Sandbeschickungstrichters (20) ein Dosierförderband (22) für den Sand endet.Apparatus according to claim 7 or 8, characterized in that a metering conveyor belt (22) for the sand ends at the inlet opening of the sand feed hopper (20). Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß der Sandbeschickungstrichter (20) mit lotrechter Mittelachse angeordnet ist und eine um diese Mittelachse drehbare Halterung (24) für das Abgabeende des Dosierförderbandes (22) trägt, an der auch der Getriebemotor (25) für die Sandförderschnecke (26) montiert ist.Apparatus according to claim 9, characterized in that the sand loading hopper (20) is arranged with a vertical central axis and carries a holder (24) rotatable about this central axis for the discharge end of the metering conveyor belt (22), on which the geared motor (25) for the sand conveyor screw (26) is mounted.
EP93112166A 1992-08-27 1993-07-29 Device for making pumpable mortar on the building site Expired - Lifetime EP0584573B1 (en)

Applications Claiming Priority (4)

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DE9211567U 1992-08-27
DE9211567U DE9211567U1 (en) 1992-08-27 1992-08-27 Device for the on-site production of pumpable mortar masses
DE4318177A DE4318177C2 (en) 1992-08-27 1993-06-01 Device for the on-site production of pumpable mortar compounds
DE4318177 1993-06-01

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AT (1) ATE164339T1 (en)
CZ (1) CZ176593A3 (en)
HU (1) HU215376B (en)
PL (1) PL172352B1 (en)
SK (1) SK78193A3 (en)

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CN107088965A (en) * 2017-06-08 2017-08-25 侯虎 A kind of Portable Automatic dispensing stirs grey machine
IT201600123711A1 (en) * 2016-12-06 2018-06-06 Revelin Diego S R L MIXER - PLASTERING MACHINE WITH REFINED LOADING GROUP
CN108698001A (en) * 2016-03-01 2018-10-23 Sika技术股份公司 Mixer, the system for applying construction material and the method for manufacturing structure by construction material
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GB2390089A (en) * 1999-11-29 2003-12-31 Innovation Holdings A process for manufacturing concrete on a continuous basis
CN108698001A (en) * 2016-03-01 2018-10-23 Sika技术股份公司 Mixer, the system for applying construction material and the method for manufacturing structure by construction material
EP3646943A3 (en) * 2016-03-01 2020-10-14 Sika Technology Ag Method for producing a structure from building material
EP3659699A3 (en) * 2016-03-01 2020-10-21 Sika Technology Ag Mixer
IT201600123711A1 (en) * 2016-12-06 2018-06-06 Revelin Diego S R L MIXER - PLASTERING MACHINE WITH REFINED LOADING GROUP
CN106984237A (en) * 2017-05-25 2017-07-28 北京中岩大地科技股份有限公司 A kind of modular multi-function mixer
CN107088965A (en) * 2017-06-08 2017-08-25 侯虎 A kind of Portable Automatic dispensing stirs grey machine
CN108908713A (en) * 2018-06-28 2018-11-30 李凤石 A kind of construction site concrete Su Hun mechanism leading power based on oblique point
CN110076909B (en) * 2019-05-24 2024-01-30 郑州市同鼎机械设备有限公司 Wet sand feeding bin of sand drying machine
CN110076909A (en) * 2019-05-24 2019-08-02 郑州市同鼎机械设备有限公司 A kind of sand drier damp sand feed hopper
CN110397440A (en) * 2019-07-31 2019-11-01 中国铁建重工集团股份有限公司 A kind of vertical shaft full face tunnel boring machine and its slag-draining device
CN111764601A (en) * 2020-07-30 2020-10-13 陈广智 Dry-wet mixed gypsum spraying machine
CN116277512B (en) * 2023-03-10 2023-11-24 江苏泰高建设有限公司 Building mortar manufacturing equipment
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CN116440792A (en) * 2023-06-16 2023-07-18 张家口安兴生物科技有限公司 Coarse cereal powder processing and proportioning device
CN116440792B (en) * 2023-06-16 2023-08-25 张家口安兴生物科技有限公司 Coarse cereal powder processing and proportioning device

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CZ176593A3 (en) 1994-03-16
HU215376B (en) 1998-12-28
EP0584573B1 (en) 1998-03-25
HU9302111D0 (en) 1993-11-29
PL300059A1 (en) 1994-03-07
HUT68331A (en) 1995-06-28
SK78193A3 (en) 1994-03-09
ATE164339T1 (en) 1998-04-15
PL172352B1 (en) 1997-09-30

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