EP1603720B1 - Mortar mixing pump - Google Patents

Mortar mixing pump Download PDF

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Publication number
EP1603720B1
EP1603720B1 EP04718929A EP04718929A EP1603720B1 EP 1603720 B1 EP1603720 B1 EP 1603720B1 EP 04718929 A EP04718929 A EP 04718929A EP 04718929 A EP04718929 A EP 04718929A EP 1603720 B1 EP1603720 B1 EP 1603720B1
Authority
EP
European Patent Office
Prior art keywords
pump according
mixing chamber
mortar
mortar mixing
mixing pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04718929A
Other languages
German (de)
French (fr)
Other versions
EP1603720A1 (en
Inventor
Klaus Kampitsch
Hannes Papousek
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.)
MAI International GmbH
Original Assignee
MAI International 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
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Publication of EP1603720A1 publication Critical patent/EP1603720A1/en
Application granted granted Critical
Publication of EP1603720B1 publication Critical patent/EP1603720B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B01F27/05—Stirrers
    • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
    • B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
    • 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
    • B01F27/62—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
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/50—Mixing receptacles
    • B01F35/511—Mixing receptacles provided with liners, e.g. wear resistant or flexible liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
    • B01F35/71731—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper using a hopper
    • 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
    • B28C5/0862—Adaptations of mixing containers therefor, e.g. use of material, coatings
    • 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
    • B28C5/14—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 the stirrers having motion about a horizontal or substantially horizontal axis
    • 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
    • B28C7/126—Supply means, e.g. nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/005—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle
    • F04C11/006—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle having complementary function
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth

Definitions

  • the present invention relates to a mortar mixing pump according to the preamble of claim 1.
  • a mortar mixing pump is known from DE 38 09 661 A1.
  • Mortar mixing pumps of the type mentioned serve for the fully automatic mixing of dry material such as ready-mixed mortar, cement and similar material, which is supplied primarily as bagged or in silos and must be mixed for use with water and optionally other additives. Mortar mixing pumps are used, for example, in tunneling.
  • the invention is therefore based on the object to provide a mortar mixing pump, which is less susceptible to deposits, therefore less cleaning effort requires and is generally easier to clean.
  • the screw conveyor which is to promote the material to be mixed in the mixing chamber, no longer arranged in a mixing tube, but in the lower part of a funnel for filling the material to be mixed.
  • the continuation of the funnel into the area around and under the auger improves its conveying capacity, in particular by equalizing the flow of material, because in this critical area now no disturbing edges and transitions between metal parts and a lining exist anymore. Dead zones and the resulting risk of formation of deposits, which could occur in the prior art mainly at the transition points between a hopper and the liner of a mixing tube, are on this Way avoided.
  • the funnel can be made in one piece or else in two parts, in particular with a transverse distribution.
  • the adjoining the hopper mixing chamber is ertindungsgemäfi a separate from the hopper and the pump flange, connected to the hopper component which is provided over its entire length with a lining of preferably polyurethane, polyethylene or silicone.
  • the lining can be produced by spraying the cylindrical mixing chamber or by inserting a corresponding, prefabricated molding. Such a molded part may also have on its side to be joined to metal a rubber layer which forms a composite with the polyurethane, polyethylene or silicone material and which is glued to the metal, for example.
  • the liner provides a very smooth and robust inner surface to which the material to be mixed practically does not adhere.
  • the lining is designed so that there is a smooth transition in the transition from the hopper to the mixing chamber.
  • the pump flange delimiting the mixing chamber at the pump end is preferably provided, on its side facing the mixing chamber, with a cover of polyurethane, polyethylene or silicone in the entire mortar-conducting region, which is in direct contact with the lining of the mixing chamber.
  • the cover of the pump flange can also be produced, for example, by spraying polyurethane material onto the desired surfaces of the pump flange. Another possibility is to button a prefabricated molded part into a passage opening of the pump flange.
  • a plurality of liquid injection nozzles is further accommodated in a nozzle carrier, which is arranged in a recess of the lining at least approximately flush with the inner surface of the lining and releasably secured by fastening means accessible from outside the mixing chamber.
  • the mentioned features of the mortar mixing pump according to the invention significantly improve the operating behavior and maintainability.
  • the inventive arrangement of the liquid injection nozzles in a nozzle carrier allows in a simple manner to realize different injection angles.
  • Any desired configuration can be illustrated, for example, all fluid injectors may have different injection angles, as well as some of the fluid injectors may have the same injection angle, and of course all the fluid injectors may have the same injection angle. However, it will usually be preferred to provide at least two different injection angles in order to achieve a faster and more uniform moisture penetration of the material to be mixed.
  • the liquid injection nozzles may according to the invention be formed in the nozzle carrier itself, e.g. by a Senkerodiermaschine or by means of a laser, when the nozzle carrier is made of metal, or for example by molding when the nozzle carrier made of plastic, in particular polyurethane, polyethylene or silicone.
  • the liquid injection nozzles may be in the form of separate inserts carried by the nozzle carrier.
  • the nozzle carrier is preferably made of metal, in particular of stainless stainless steel, and the inserts are made of a plastic, in particular polyurethane, polyethylene or silicone.
  • the inserts can also be made of metal.
  • Each insert preferably comprises a plurality of liquid injection nozzles, wherein according to an embodiment the liquid injection nozzles of an insert each have the same injection angle. It is advantageous if the inserts are designed so that they can be used in two positions, which differ from each other by 180 ° in the nozzle carrier. It can then be realized with the same applications two different injection angle by an insert in one position and another use in the other position is inserted into the nozzle carrier.
  • a common feed line preferably supplies all liquid nozzle nozzles assigned to a nozzle carrier with liquid.
  • a distributor element is preferably connected between the end of the feed line and the nozzle carrier, which takes over the supply of liquid from the feed line to the individual liquid injection nozzles.
  • This distribution element may be, for example, a plastic molding whose material is chosen is that it also ensures a seal between the feed line and the outside of the mixing chamber.
  • the screw conveyor is provided with a sheath made of polyurethane, polyethylene or silicone in preferred embodiments.
  • the design can be such that the screw conveyor has only an inner shaft made of steel and the individual screw threads are completely formed of polyurethane, polyethylene or silicone.
  • a motor flange adjacent to the mixing chamber distal end of the screw conveyor is preferably provided on its side facing the funnel with a lining made of polyurethane, polyethylene or silicone.
  • This cladding has according to a preferred embodiment, a molded sealing lip for sealing against a screw driving the auger.
  • Figure 1 shows in a spatial representation obliquely from above a generally designated 10 mortar mixing pump, whose main components arranged in a hopper 12 screw conveyor 14, arranged on one side of the hopper 12 electric motor 16 for driving the screw conveyor 14, one on the opposite side of the hopper 12 arranged mixing chamber 18, a mixing chamber 18 at the funnel distal end limiting pump flange 20, and connected by means of the pump flange 20 with the mixing chamber 18 eccentric screw pump 22 are.
  • the funnel 12 is formed in two parts in the illustrated embodiment and comprises a reproduced in the figures, lower part and not shown in the figures, the upper part, which is opposite to the lower part and which serves to fill the mixing material to be mixed in the mortar mixing pump 10 ,
  • the upper hopper part can be removed for transporting the mortar mixing pump 10 to facilitate their handling.
  • a closure slide 30 is arranged in the upper region of the lower funnel part, with which the funnel-filling opening, in particular when the funnel upper part is removed during transport, can be closed.
  • the here two-part funnel 12 is preferably made of stainless steel.
  • the screw conveyor 14 is disposed in the lower part of the hopper 12 near the bottom thereof so as to convey the building material filled in the hopper 12 to the right as it turns out of the hopper into the mixing chamber 18.
  • the worm threads of the screw conveyor 14 are formed in the embodiment shown completely made of polyurethane and are part of a prefabricated polyurethane sheath 32, which is inserted or pressed into the steel shaft 26. As shown, the auger 14 does not only pass axially through the entire lower part of the funnel 12, but continues to settle into the mixing chamber 18.
  • the engine-end of the steel shaft 26 of the screw conveyor 14 is connected by a coupling 34 with a mixing member 36 which is rotationally driven by the screw conveyor 14 and for mixing the conveyed into the mixing chamber 18 building material with one or more liquids, eg with water, serves, which is supplied by means of a still to be described in more detail liquid injection device 38 of the mixing chamber 18 or become.
  • the mixing member 36 is provided with a series of circumferentially and axially spaced apart wings 40, which are mounted on a hollow cylindrical body 42 which is rotatably connected to a steel shaft 44 passing through it.
  • a stub 46 of a rotor 48 of the eccentric screw pump 22 extends into the mixing chamber 18 into it.
  • This stub 46 is rotatably connected by means of another coupling 50 with the adjacent end of the mixing member 36, so that upon rotation of the screw conveyor 14 and the mixing member 36 and the rotor 48 is set in rotational motion.
  • the two clutches 34 and 50 not only transmit said rotational movement but also act as hinges capable of absorbing the eccentricity occurring when the rotor 48 of the eccentric screw pump 22 rotates.
  • the eccentric screw pump 22 fastened to the pump flange 20 is of conventional construction and known function and will therefore not be explained further here. It also refrains from further describing the filling, conveying and mixing process taking place in the mortar mixing pump 10, since this is known to a person skilled in the art, e.g. from DE 38 09 661 A1.
  • the polyurethane lining 52 has a smooth inner surface and is provided on its outer side with a series of circumferential grooves 56, which for improved longitudinal elasticity of the Polyurethane lining 52 provide. As can be seen in particular from FIGS.
  • the polyurethane lining 52 is guided radially out of the mixing chamber 18 at the ends of the hollow cylinder 54 in order to achieve an improved sealing of the mixing chamber 18 both with respect to the funnel 12 and with respect to the pump flange 20.
  • the polyurethane liner 52 is provided on the end face of the radially extended portion facing the pump flange 20 with two integral annular sealing lips 58, 59 which further increase the quality of the seal to the pump flange 20.
  • the liquid injection device 38 is also constructed so that deposits in the mixing chamber 18 are avoided as far as possible in their area.
  • the liquid injection device 38 has a nozzle carrier 60, which in the exemplary embodiment shown is of elongate shape and is arranged in a corresponding recess 62 of the polyurethane lining 52 flush or at least approximately flush with the inner surface of the polyurethane lining 52.
  • the nozzle carrier 60 is in the described embodiment of stainless steel and has, as can be seen well in particular from Figure 3 and Figure 4, two inserts 64, in each of which two liquid injection nozzles 66 are formed, i. the liquid injection device 38 has four injection nozzles 66 in the illustrated embodiment.
  • the inserts 64 are made of polyurethane in the described embodiment, but may also be made of another suitable plastic or metal. According to a modified embodiment, not shown, the injection nozzles 66 may also be formed in the nozzle carrier 60 itself.
  • All injectors 66 may have the same injection angle. Preferably, however, the liquid injection nozzles 66 have different injection angles, in particular pairs of different injection angles, in order to achieve a more even and faster through-wetting of the material to be mixed in the mixing chamber 18.
  • the nozzle carrier 60 may include more than two inserts 64, that each insert 64 may include one or more injectors 66, that the injectors 66 of an insert 64 may have equal or different injection angles, and that if desired or required, even more nozzle carrier 60 may be provided.
  • the nozzle carrier 60 is held in the example shown by two countersunk screws 68, the shaft extends radially outwardly through the nozzle carrier 60, the polyurethane lining 52, the hollow cylinder 54, a distributor element 70 and a mounting flange 72.
  • corresponding thread bolts can be firmly attached to the nozzle carrier 60.
  • the mounting flange 72 is connected to the end of a feed line 74, is passed through the liquid to the liquid injection device 38.
  • the end of the feed line 74 opens into the distributor element 70 arranged between the fastening flange 72 and the hollow cylinder 54, which is formed inside, e.g. by appropriate channels or suitable recesses, that the liquid from the feed line 74 to the individual liquid injection nozzles 66 is fed through corresponding openings in the hollow cylinder 54 and the polyurethane liner 52.
  • the distributor element 70 provides a seal between the feed line 74 and the outside of the mixing chamber 18, more precisely its hollow cylinder 54.
  • the distributor element 70 is preferably made of a material such as rubber or plastic, e.g. Polyurethane, which is sufficiently elastic to ensure a good seal, and in which the required channels or recesses can be easily introduced.
  • the distributor element 70 is braced between the fastening flange 72 and the outside of the hollow cylinder 54.
  • the inserts 64 are to be removed, for example, to clean or replace them, only the nuts 76 need to be loosened, and then the nozzle carrier 60 with the inserts 64 can be removed inwardly.
  • the pump flange 20 is provided on its side facing the mixing chamber 18 throughout the material-carrying area with a cover 78 made of polyurethane, which is formed in the illustrated embodiment by a polyurethane molding 80, which in a central through hole the pump flange 20 is buttoned, through which also the stub 46 of the rotor 48 projects into the mixing chamber 18.
  • the polyurethane molding 80 is adapted to the shape of the through hole and designed so that it remains securely attached to the pump flange 20 after the Einknöpfvorgang. As can be seen in particular from FIG.
  • the polyurethane molded part 80 is pulled radially on both sides of the pump flange 20 so far outward in each case, that it comes into contact with the radially inner sealing lip 58 on the side facing the mixing chamber 18 and can serve as a seal between a stator 82 of the eccentric screw pump 22 and the pump flange 20 on the side facing the eccentric screw pump 22. As shown in FIG.
  • an annular section 84 of the polyurethane molded part 80 is received in the mixing chamber side in a corresponding recess of the pump flange 20, this recess extending radially outwardly only to the extent that the radially outer sealing lip 59 of the polyurethane lining 52 no longer engages with the annular section 84 but comes into contact with the metal of the pump flange 20.
  • the cover 78 can also be achieved by spraying PU material onto the pump flange 20 (not shown).
  • the area of the motor flange 28 is still protected in a special way against deposits.
  • the side of the motor flange 28 facing the funnel 12 is provided with a polyurethane covering 86, which on the one hand seals the motor flange 28 with respect to the outside of the funnel 12 and on the other hand by means of an integrally formed, obliquely inside the direction of the funnel 12 projecting annular sealing lip 88 provides a seal to the rotating engine clutch 24.
  • the polyurethane covering 86 is, apart from the molded-on sealing lip 88, an annular disc-shaped part, which is fastened for example in the manner of a bayonet lock on the motor flange 28. It provides an effective seal between the interior of the funnel 12 and the electric motor 16 and at the same time prevents unwanted material deposits from forming in this area.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Rotary Pumps (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Screw Conveyors (AREA)
  • Accessories For Mixers (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

The cement and mortar mixing pump has a powered impeller screw (14) in a funnel (12) to be filled with the materials for mixing. The mixing chamber (18), separately between the funnel and the pump flange (20), is a component fastened to the funnel where the mixing chamber cladding (52) is in direct contact with the funnel and the pump flange. A number of liquid spray jets are held in a jet carrier, fitted within a recess in the chamber cladding to lie flush with its inner surface, in a release mounting which can be accessed externally.

Description

Die vorliegende Erfindung betrifft eine Mörtelmischpumpe gemäß dem Oberbegriff des Patentanspruchs 1. Eine solche Mörtelmischpumpe ist aus der DE 38 09 661 A1 bekannt.The present invention relates to a mortar mixing pump according to the preamble of claim 1. Such a mortar mixing pump is known from DE 38 09 661 A1.

Mörtelmischpumpen der genannten Art dienen zum vollautomatischen Mischen von Trockenmaterial wie Fertigmörtel, Zement und ähnlichem Material, das vornehmlich als Sackware oder in Silos angeliefert wird und zur Verwendung mit Wasser sowie gegebenenfalls weiteren Zusatzstoffen gemischt werden muss. Mörtelmischpumpen finden beispielsweise im Tunnelbau Anwendung.Mortar mixing pumps of the type mentioned serve for the fully automatic mixing of dry material such as ready-mixed mortar, cement and similar material, which is supplied primarily as bagged or in silos and must be mixed for use with water and optionally other additives. Mortar mixing pumps are used, for example, in tunneling.

Obwohl Mörtelmischpumpen der im Oberbegriff genannten Art schon eine bedeutende Verbesserung gegenüber früher üblichen Vorrichtungen darstellen, bestehen nach wie vor Probleme dahingehend, dass sich Ablagerungen im Bereich der Mischkammer bilden und insbesondere der Mischkammerbereich schwer zu reinigen ist.Although mortar mixing pumps of the type mentioned in the preamble already represent a significant improvement over previously conventional devices, there are still problems that form deposits in the mixing chamber and in particular the mixing chamber area is difficult to clean.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Mörtelmischpumpe anzugeben, die weniger anfällig für Ablagerungen ist, deshalb weniger Reinigungsaufwand erfordert und insgesamt leichter zu reinigen ist.The invention is therefore based on the object to provide a mortar mixing pump, which is less susceptible to deposits, therefore less cleaning effort requires and is generally easier to clean.

Diese Aufgabe ist erfindungsgemäß mit einer Mörtelmischpumpe gelöst, die die im Patentanspruch 1 angegebenen Merkmale aufweist.This object is achieved with a mortar mixing pump having the features specified in claim 1.

Erfindungsgemäß ist demnach die Förderschnecke, die das zu vermischende Material in die Mischkammer fördern soll, nicht mehr in einem Mischrohr, sondern in dem unteren Teil eines Trichters zum Einfüllen des zu vermischenden Materials angeordnet. Die Fortsetzung des Trichters bis in den Bereich um und unter die Förderschnecke verbessert deren Fördervermögen, insbesondere durch eine Vergleichmäßigung des Materialflusses, weil in diesem kritischen Bereich jetzt keine störenden Kanten und Übergänge zwischen Metallteilen und einer Auskleidung mehr existieren. Totzonen und die sich damit ergebende Gefahr der Bildung von Ablagerungen, zu der es beim Stand der Technik vorwiegend an den Übergangsstellen zwischen einem Einfülltrichter und der Auskleidung eines Mischrohres kommen konnte, werden auf diese Weise vermieden. Der Trichter kann einstückig oder auch zweiteilig mit insbesondere einer Querteilung ausgeführt sein.According to the invention, therefore, the screw conveyor, which is to promote the material to be mixed in the mixing chamber, no longer arranged in a mixing tube, but in the lower part of a funnel for filling the material to be mixed. The continuation of the funnel into the area around and under the auger improves its conveying capacity, in particular by equalizing the flow of material, because in this critical area now no disturbing edges and transitions between metal parts and a lining exist anymore. Dead zones and the resulting risk of formation of deposits, which could occur in the prior art mainly at the transition points between a hopper and the liner of a mixing tube, are on this Way avoided. The funnel can be made in one piece or else in two parts, in particular with a transverse distribution.

Die sich an den Trichter anschiießende Mischkammer ist ertindungsgemäfi ein vom Trichter und auch vom Pumpenflansch separates, mit dem Trichter verbundenes Bauteil, welches über seine gesamte Länge mit einer Auskleidung aus vorzugsweise Polyurethan, Polyethylen oder Silikon versehen ist. Die Auskleidung kann durch Ausspritzen der zylindrischen Mischkammer oder auch durch Einsetzen eines entsprechenden, vorgefertigten Formteils erzeugt werden. Ein solches Formteil kann an seiner mit Metall zu verbindenden Seite auch eine Gummischicht aufweisen, die mit dem Polyurethan-, Polyethylen- oder Silikonmaterial einen Verbund bildet und die beispielsweise mit dem Metall verklebt wird. Die Auskleidung stellt eine sehr glatte und robuste innere Oberfläche bereit, an der das zu vermischende Material praktisch nicht haften bleibt. Vorzugsweise ist die Auskleidung so gestaltet, dass sich beim Übergang vom Trichter zur Mischkammer ein stufenloser Übergang ergibt.The adjoining the hopper mixing chamber is ertindungsgemäfi a separate from the hopper and the pump flange, connected to the hopper component which is provided over its entire length with a lining of preferably polyurethane, polyethylene or silicone. The lining can be produced by spraying the cylindrical mixing chamber or by inserting a corresponding, prefabricated molding. Such a molded part may also have on its side to be joined to metal a rubber layer which forms a composite with the polyurethane, polyethylene or silicone material and which is glued to the metal, for example. The liner provides a very smooth and robust inner surface to which the material to be mixed practically does not adhere. Preferably, the lining is designed so that there is a smooth transition in the transition from the hopper to the mixing chamber.

Der die Mischkammer am pumpenseitigen Ende begrenzende Pumpenflansch ist vorzugsweise auf seiner der Mischkammer zugekehrten Seite im gesamten mörtelführenden Bereich mit einer Abdeckung aus Polyurethan, Polyethylen oder Silikon versehen, die in unmittelbarem Kontakt mit der Auskleidung der Mischkammer steht. Die Abdeckung des Pumpenflansches kann ebenfalls beispielsweise durch Aufspritzen von Polyurethanmaterial auf die gewünschten Flächen des Pumpenflansches erzeugt werden. Eine andere Möglichkeit besteht darin, ein vorgefertigtes Formteil in eine Durchgangsöffnung des Pumpenflansches einzuknöpfen.The pump flange delimiting the mixing chamber at the pump end is preferably provided, on its side facing the mixing chamber, with a cover of polyurethane, polyethylene or silicone in the entire mortar-conducting region, which is in direct contact with the lining of the mixing chamber. The cover of the pump flange can also be produced, for example, by spraying polyurethane material onto the desired surfaces of the pump flange. Another possibility is to button a prefabricated molded part into a passage opening of the pump flange.

Erfindungsgemäß ist des weiteren eine Mehrzahl von Flüssigkeitseinspritzdüsen in einem Düsenträger aufgenommen, der in einer Aussparung der Auskleidung zumindest annähernd bündig mit der Innenfläche der Auskleidung angeordnet und durch von außerhalb der Mischkammer zugängliche Befestigungsmittel lösbar befestigt ist. Diese Art der Ausführung reduziert zum einen beträchtlich die Gefahr der Bildung von Ablagerungen im Bereich der Flüssigkeitseinspritzdüsen und ermöglicht zum anderen eine einfachere Reinigung der Flüssigkeitseinspritzdüsen, indem die Befestigung des Düsenträgers von außen gelöst und der Düsenträger dann nach innen aus der Mischkammer herausgenommen werden kann.According to the invention, a plurality of liquid injection nozzles is further accommodated in a nozzle carrier, which is arranged in a recess of the lining at least approximately flush with the inner surface of the lining and releasably secured by fastening means accessible from outside the mixing chamber. This type of execution, on the one hand, considerably reduces the risk of formation of deposits in the area of the liquid injection nozzles and, on the other hand, makes cleaning of the liquid injection nozzles easier by detaching the attachment of the nozzle holder from the outside and then removing the nozzle carrier inwards from the mixing chamber.

In ihrer Gesamtheit verbessern die genannten Merkmale der erfindungsgemäßen Mörtelmischpumpe das Betriebsverhalten und die Wartbarkeit erheblich.In their entirety, the mentioned features of the mortar mixing pump according to the invention significantly improve the operating behavior and maintainability.

Die erfindungsgemäße Anordnung der Flüssigkeitseinspritzdüsen in einem Düsenträger gestattet es auf einfache Art und Weise, unterschiedliche Einspritzwinkel zu realisieren. Jede gewünschte Konfiguration ist darstellbar, beispielsweise können alle Fiüssigkeitseinspritzdüsen unterschiedliche Einspritzwinkei aufweisen, ebenso können einige der Flüssigkeitseinspritzdüsen denselben Einspritzwinkel aufweisen und selbstverständlich können auch alle Flüssigkeitseinspritzdüsen den gleichen Einspritzwinkel haben. Es wird jedoch in der Regel bevorzugt sein, wenigstens zwei unterschiedliche Einspritzwinkel vorzusehen, um eine schnellere und gleichmäßigere Durchfeuchtung des zu vermischenden Materials zu erreichen.The inventive arrangement of the liquid injection nozzles in a nozzle carrier allows in a simple manner to realize different injection angles. Any desired configuration can be illustrated, for example, all fluid injectors may have different injection angles, as well as some of the fluid injectors may have the same injection angle, and of course all the fluid injectors may have the same injection angle. However, it will usually be preferred to provide at least two different injection angles in order to achieve a faster and more uniform moisture penetration of the material to be mixed.

Die Flüssigkeitseinspritzdüsen können erfindungsgemäß in dem Düsenträger selbst ausgebildet sein, z.B. durch ein Senkerodierverfahren oder mittels eines Lasers, wenn der Düsenträger aus Metall besteht, oder beispielsweise durch Einformen, wenn der Düsenträger aus Kunststoff, insbesondere aus Polyurethan, Polyethylen oder Silikon besteht. Alternativ können die Flüssigkeitseinspritzdüsen in Gestalt separater, vom Düsenträger getragener Einsätze ausgebildet sein. Bei einer solchen Ausführungsform ist vorzugsweise der Düsenträger aus Metall, insbesondere aus nicht rostendem Edelstahl ausgeführt, und die Einsätze bestehen aus einem Kunststoff, insbesondere aus Polyurethan, Polyethylen oder Silikon. Die Einsätze können jedoch ebenfalls aus Metall bestehen. Jeder Einsatz umfasst vorzugsweise mehrere Flüssigkeitseinspritzdüsen, wobei gemäß einer Ausführungsform die Flüssigkeitseinspritzdüsen eines Einsatzes jeweils den gleichen Einspritzwinkel aufweisen. Es ist dabei vorteilhaft, wenn die Einsätze so ausgebildet sind, dass sie in zwei Stellungen, die sich um 180° voneinander unterscheiden in den Düsenträger einsetzbar sind. Es können dann mit gleich ausgeführten Einsätzen zwei unterschiedliche Einspritzwinkel realisiert werden, indem ein Einsatz in der einen Stellung und ein weiterer Einsatz in der anderen Stellung in den Düsenträger eingesetzt wird.The liquid injection nozzles may according to the invention be formed in the nozzle carrier itself, e.g. by a Senkerodierverfahren or by means of a laser, when the nozzle carrier is made of metal, or for example by molding when the nozzle carrier made of plastic, in particular polyurethane, polyethylene or silicone. Alternatively, the liquid injection nozzles may be in the form of separate inserts carried by the nozzle carrier. In such an embodiment, the nozzle carrier is preferably made of metal, in particular of stainless stainless steel, and the inserts are made of a plastic, in particular polyurethane, polyethylene or silicone. However, the inserts can also be made of metal. Each insert preferably comprises a plurality of liquid injection nozzles, wherein according to an embodiment the liquid injection nozzles of an insert each have the same injection angle. It is advantageous if the inserts are designed so that they can be used in two positions, which differ from each other by 180 ° in the nozzle carrier. It can then be realized with the same applications two different injection angle by an insert in one position and another use in the other position is inserted into the nozzle carrier.

Unabhängig davon, ob die Flüssigkeitseinspritzdüsen in dem Düsenträger selbst oder in vom Düsenträger getragenen Einsätzen ausgebildet sind, versorgt vorzugsweise eine gemeinsame Speiseleitung alle einem Düsenträger zugeordneten Flüssigkeitseinspritzdüsen mit Flüssigkeit. Auf diese Weise ist die Zahl der außen an der Mörtelmischpumpen vorzunehmenden Anschlüsse deutlich reduziert. Bei einer solchen Ausführungsform ist vorzugsweise zwischen das Ende der Speiseleitung und den Düsenträger ein Verteilerelement geschaltet, das die Zuführung von Flüssigkeit aus der Speiseleitung zu den einzelnen Flüssigkeitseinspritzdüsen übernimmt. Dieses Verteilerelement kann beispielsweise ein Kunststoffformteil sein, dessen Material so gewählt ist, dass es zugleich für eine Abdichtung zwischen der Speiseleitung und der Außenseite der Mischkammer sorgt.Regardless of whether the liquid injection nozzles are formed in the nozzle carrier itself or in inserts carried by the nozzle carrier, a common feed line preferably supplies all liquid nozzle nozzles assigned to a nozzle carrier with liquid. In this way, the number of connections to be made on the outside of the mortar mixing pumps is significantly reduced. In such an embodiment, a distributor element is preferably connected between the end of the feed line and the nozzle carrier, which takes over the supply of liquid from the feed line to the individual liquid injection nozzles. This distribution element may be, for example, a plastic molding whose material is chosen is that it also ensures a seal between the feed line and the outside of the mixing chamber.

Zur weiteren Verbesserung der Betriebssicherheit ist bei bevorzugten Ausführungsformen der erfindungsgemäßen Mörtelmischpumpe auch die Förderschnecke mit einer Ummantelung aus Polyurethan, Polyethylen oder Silikon versehen. Die Ausführung kann dabei so sein, dass die Förderschnecke lediglich eine innere Welle aus Stahl aufweist und die einzelnen Schneckengänge vollständig aus Polyurethan, Polyethylen oder Silikon gebildet sind.To further improve the reliability of the mortar mixing pump according to the invention also the screw conveyor is provided with a sheath made of polyurethane, polyethylene or silicone in preferred embodiments. The design can be such that the screw conveyor has only an inner shaft made of steel and the individual screw threads are completely formed of polyurethane, polyethylene or silicone.

Damit auch am mischkammerfernen Ende der Förderschnecke Ablagerungen weitgehend verhindert sind, ist vorzugsweise ein dem mischkammerfernen Ende der Förderschnecke benachbarter Motorflansch auf seiner dem Trichter zugewandten Seite mit einer Verkleidung aus Polyurethan, Polyethylen oder Silikon versehen. Diese Verkleidung weist gemäß einer bevorzugten Ausgestaltung eine angeformte Dichtlippe zur Abdichtung gegenüber einer die Förderschnecke antreibenden Welle auf.So that deposits are also largely prevented at the mixing chamber remote end of the screw conveyor, a motor flange adjacent to the mixing chamber distal end of the screw conveyor is preferably provided on its side facing the funnel with a lining made of polyurethane, polyethylene or silicone. This cladding has according to a preferred embodiment, a molded sealing lip for sealing against a screw driving the auger.

Ein bevorzugtes Ausführungsbeispiel einer erfindungsgemäßen Mörtelmischpumpe wird im folgenden anhand der beigefügten, schematischen Zeichnungen näher erläutert. Es zeigt:

Figur 1
ein Ausführungsbeispiel einer erfindungsgemäßen Mörtelmischpumpe in räumlicher Darstellung von schräg oben,
Figur 2
die Mörtelmischpumpe aus Figur 1 im Längsschnitt,
Figur 3
die Mischkammer der in den Figuren 1 und 2 dargestellten Mörtelmischpumpe in aufgeschnittener, räumlicher Darstellung, wobei eine Flüssigkeitszuführeinrichtung in auseinandergezogener Darstellung wiedergegeben ist,
Figur 4
die Flüssigkeitszuführeinrichtung im Längsschnitt und im zusammengebauten Zustand,
Figur 5
den Bereich eines Pumpenflansches der Mörtelmischpumpe gemäß den Figuren 1 und 2 in geschnittener und vergrößerter Darstellung, und
Figur 6
den Bereich eines Motorflansches der Mörtelmischpumpe gemäß den Figuren 1 und 2 in geschnittener und vergrößerter Darstellung.
A preferred embodiment of a mortar mixing pump according to the invention is explained below with reference to the accompanying schematic drawings. It shows:
FIG. 1
an embodiment of a mortar mixing pump according to the invention in a spatial representation obliquely from above,
FIG. 2
the mortar mixing pump of Figure 1 in longitudinal section,
FIG. 3
the mixing chamber of the mortar mixing pump shown in Figures 1 and 2 in a cutaway, spatial representation, wherein a liquid supply device is shown in exploded view,
FIG. 4
the liquid supply device in longitudinal section and in the assembled state,
FIG. 5
the region of a pump flange of the mortar mixing pump according to Figures 1 and 2 in a sectional and enlarged view, and
FIG. 6
the area of a motor flange of the mortar mixing pump according to Figures 1 and 2 in a sectional and enlarged view.

Figur 1 zeigt in räumlicher Darstellung von schräg oben eine allgemein mit 10 bezeichnete Mörtelmischpumpe, deren Hauptbestandteile eine in einem Trichter 12 angeordnete Förderschnecke 14, ein auf einer Seite des Trichters 12 angeordneter Elektromotor 16 zum Antreiben der Förderschnecke 14, eine auf der gegenüberliegenden Seite des Trichters 12 angeordnete Mischkammer 18, ein die Mischkammer 18 am trichterfernen Ende begrenzender Pumpenflansch 20, und eine mittels des Pumpenflansches 20 mit der Mischkammer 18 verbundene Exzenterschneckenpumpe 22 sind.Figure 1 shows in a spatial representation obliquely from above a generally designated 10 mortar mixing pump, whose main components arranged in a hopper 12 screw conveyor 14, arranged on one side of the hopper 12 electric motor 16 for driving the screw conveyor 14, one on the opposite side of the hopper 12 arranged mixing chamber 18, a mixing chamber 18 at the funnel distal end limiting pump flange 20, and connected by means of the pump flange 20 with the mixing chamber 18 eccentric screw pump 22 are.

Aus dem in Figur 2 gezeigten Längsschnitt der Mörtelmischpumpe 10 geht der konstruktive Aufbau der einzelnen Komponenten deutlicher hervor. Am in Figur 2 linken Ende der Mörtelmischpumpe 10 befindet sich der zum Drehantrieb der Förderschnecke 14 dienende, nur schematisch wiedergegebene Elektromotor 16, der über eine Motorkupplung 24 mit dem einen Ende einer den Kern der Förderschnecke 14 bildenden Stahlwelle 26 verbunden ist, die die Förderschnecke 14 mittig durchsetzt. Der Elektromotor 16 ist mittels eines Motorflansches 28, dessen Aufbau später noch genauer beschrieben wird, an den Trichter 12 angebunden.From the longitudinal section of the mortar mixing pump 10 shown in Figure 2, the structural design of the individual components is clearer. At the left in Figure 2 end of the mortar mixing pump 10 is the rotary drive of the screw conveyor 14 serving, only schematically reproduced electric motor 16 which is connected via an engine clutch 24 to one end of the core of the screw conveyor 14 forming steel shaft 26, the screw conveyor 14th interspersed in the middle. The electric motor 16 is connected to the hopper 12 by means of a motor flange 28, the structure of which will be described in more detail later.

Der Trichter 12 ist im dargestellten Ausführungsbeispiel zweiteilig ausgebildet und umfasst einen in den Figuren wiedergegebenen, unteren Teil sowie einen in den Figuren nicht dargestellten, oberen Teil, der gegenüber dem unteren Teil erweitert ist und der zum Einfüllen des zu vermischenden Baumaterials in die Mörtelmischpumpe 10 dient. Der obere Trichterteil kann zum Transport der Mörtelmischpumpe 10 abgenommen werden, um deren Handhabung zu erleichtern. Wie dargestellt ist im oberen Bereich des unteren Trichterteils ein Verschlussschieber 30 angeordnet, mit dem die Trichtereinfüllöffnung, insbesondere bei abgenommenem Trichteroberteil während des Transports, verschlossen werden kann. Der hier zweiteilig ausgeführte Trichter 12 ist vorzugsweise aus nicht rostendem Stahlblech gefertigt.The funnel 12 is formed in two parts in the illustrated embodiment and comprises a reproduced in the figures, lower part and not shown in the figures, the upper part, which is opposite to the lower part and which serves to fill the mixing material to be mixed in the mortar mixing pump 10 , The upper hopper part can be removed for transporting the mortar mixing pump 10 to facilitate their handling. As shown, a closure slide 30 is arranged in the upper region of the lower funnel part, with which the funnel-filling opening, in particular when the funnel upper part is removed during transport, can be closed. The here two-part funnel 12 is preferably made of stainless steel.

Die Förderschnecke 14 ist im unteren Teil des Trichters 12 nahe dessen Boden so angeordnet, dass sie das in den Trichter 12 eingefüllte Baumaterial dann, wenn sie sich dreht, nach rechts aus dem Trichter heraus in die Mischkammer 18 fördert. Die Schneckengänge der Förderschnecke 14 sind im gezeigten Ausführungsbeispiel vollständig aus Polyurethan gebildet und sind Teil einer vorgefertigten Polyurethanummantelung 32, die in die Stahlwelle 26 eingesetzt bzw. eingepresst wird. Die Förderschnecke 14 durchquert wie dargestellt nicht nur durch den gesamten unteren Teil des Trichters 12 axial, sondern setzt sich noch etwas in die Mischkammer 18 fort. Das in der Mischkammer 18 angeordnete, motorterne Ende der Stahlwelle 26 der Förderschnecke 14 ist mittels einer Kupplung 34 mit einem Mischorgan 36 verbunden, welches von der Förderschnecke 14 drehangetrieben wird und zum Vermischen des in die Mischkammer 18 geförderten Baumaterials mit einer oder mehreren Flüssigkeiten, z.B. mit Wasser, dient, welche mittels einer noch detaillierter zu beschreibenden Flüssigkeitseinspritzeinrichtung 38 der Mischkammer 18 zugeführt wird bzw. werden. Hierzu ist das Mischorgan 36 mit einer Reihe von sowohl in Umfangsrichtung als auch in Axialrichtung voneinander beabstandeten Flügeln 40 versehen, die auf einem hohlzylindrischen Grundkörper 42 befestigt sind, welcher mit einer ihn durchsetzenden Stahlwelle 44 drehfest verbunden ist.The screw conveyor 14 is disposed in the lower part of the hopper 12 near the bottom thereof so as to convey the building material filled in the hopper 12 to the right as it turns out of the hopper into the mixing chamber 18. The worm threads of the screw conveyor 14 are formed in the embodiment shown completely made of polyurethane and are part of a prefabricated polyurethane sheath 32, which is inserted or pressed into the steel shaft 26. As shown, the auger 14 does not only pass axially through the entire lower part of the funnel 12, but continues to settle into the mixing chamber 18. The arranged in the mixing chamber 18, the engine-end of the steel shaft 26 of the screw conveyor 14 is connected by a coupling 34 with a mixing member 36 which is rotationally driven by the screw conveyor 14 and for mixing the conveyed into the mixing chamber 18 building material with one or more liquids, eg with water, serves, which is supplied by means of a still to be described in more detail liquid injection device 38 of the mixing chamber 18 or become. For this purpose, the mixing member 36 is provided with a series of circumferentially and axially spaced apart wings 40, which are mounted on a hollow cylindrical body 42 which is rotatably connected to a steel shaft 44 passing through it.

Durch den das trichterferne Ende der Mischkammer 18 begrenzenden Pumpenflansch 20 erstreckt sich ein Stummel 46 eines Rotors 48 der Exzenterschneckenpumpe 22 in die Mischkammer 18 hinein. Dieser Stummel 46 ist mit mittels einer weiteren Kupplung 50 drehfest mit dem angrenzenden Ende des Mischorgans 36 verbunden, so dass bei einer Drehung der Förderschnecke 14 und des Mischorgans 36 auch der Rotor 48 in Drehbewegung versetzt wird. Die beiden Kupplungen 34 und 50 übertragen nicht nur die genannte Drehbewegung, sondern wirken auch als Gelenke, die in der Lage sind, die beim Rotieren des Rotors 48 der Exzenterschneckenpumpe 22 auftretende Exzentrizität aufzunehmen. Die am Pumpenflansch 20 befestigte Exzenterschneckenpumpe 22 ist von konventionellem Aufbau und bekannter Funktion und wird deshalb hier nicht weiter erläutert. Ebenso wird davon abgesehen, den in der Mörtelmischpumpe 10 ablaufenden Einfüll-, Förder- und Vermischungsvorgang näher zu beschreiben, denn dieser ist Fachleuten bekannt, z.B. aus der DE 38 09 661 A1.By the hopper distal end of the mixing chamber 18 limiting pump flange 20, a stub 46 of a rotor 48 of the eccentric screw pump 22 extends into the mixing chamber 18 into it. This stub 46 is rotatably connected by means of another coupling 50 with the adjacent end of the mixing member 36, so that upon rotation of the screw conveyor 14 and the mixing member 36 and the rotor 48 is set in rotational motion. The two clutches 34 and 50 not only transmit said rotational movement but also act as hinges capable of absorbing the eccentricity occurring when the rotor 48 of the eccentric screw pump 22 rotates. The eccentric screw pump 22 fastened to the pump flange 20 is of conventional construction and known function and will therefore not be explained further here. It also refrains from further describing the filling, conveying and mixing process taking place in the mortar mixing pump 10, since this is known to a person skilled in the art, e.g. from DE 38 09 661 A1.

Um Ablagerungen von in der Mörtelmischpumpe 10 befindlichem Material weitestgehend zu vermeiden, sind in der Mörtelmischpumpe 10 eine Reihe von Merkmalen vorgesehen. So ist zunächst, siehe insbesondere Figur 3, die gesamte Mischkammer 18, die ein vom Trichter 12 und vom Pumpenflansch 20 separates Bauteil darstellt, innen mit einer Polyurethanauskleidung 52 versehen, die im dargestellten Ausführungsbeispiel als vorgefertigtes Formteil ausgeführt ist, welches in einen die Mischkammer 18 festlegenden Hohlzylinder 54 aus Metall eingesetzt ist. Die Polyurethanauskleidung 52 hat eine glatte Innenfläche und ist auf ihrer Außenseite mit einer Reihe von Umfangsnuten 56 versehen, die für eine verbesserte Längselastizität der Polyurethanauskleidung 52 sorgen. Die Polyurethanauskleidung 52 ist, wie insbesondere aus den Figuren 2 und 3 zu ersehen, an den Enden des Hohlzylinders 54 radial aus der Mischkammer 18 herausgeführt, um eine verbesserte Abdichtung der Mischkammer 18 sowohl gegenüber dem Trichter 12 als auch gegenüber dem Pumpenflansch 20 zu erreichen. Zusätzlich ist die Polyurethanauskleidung 52 im dargestellten Ausführungsbeispiel auf der Stirnfläche des radial herausgezogenen Bereichs, der dem Pumpenflansch 20 zugewandt ist, mit zwei angeformten, ringförmigen Dichtungslippen 58, 59 versehen, die die Qualität der Abdichtung zum Pumpenflansch 20 noch erhöhen.In order to avoid deposits of material located in the mortar mixing pump 10 as far as possible, a number of features are provided in the mortar mixing pump 10. Thus, first of all, see in particular FIG. 3, the entire mixing chamber 18, which is a separate component from the funnel 12 and from the pump flange 20, is internally provided with a polyurethane lining 52, which in the illustrated embodiment is designed as a prefabricated molded part, which enters into a mixing chamber 18 defining hollow cylinder 54 is inserted from metal. The polyurethane lining 52 has a smooth inner surface and is provided on its outer side with a series of circumferential grooves 56, which for improved longitudinal elasticity of the Polyurethane lining 52 provide. As can be seen in particular from FIGS. 2 and 3, the polyurethane lining 52 is guided radially out of the mixing chamber 18 at the ends of the hollow cylinder 54 in order to achieve an improved sealing of the mixing chamber 18 both with respect to the funnel 12 and with respect to the pump flange 20. In addition, in the illustrated embodiment, the polyurethane liner 52 is provided on the end face of the radially extended portion facing the pump flange 20 with two integral annular sealing lips 58, 59 which further increase the quality of the seal to the pump flange 20.

Die Flüssigkeitseinspritzeinrichtung 38 ist ebenfalls so aufgebaut, dass in ihrem Bereich Ablagerungen in der Mischkammer 18 möglichst vermieden sind. Die Flüssigkeitseinspritzeinrichtung 38 weist hierzu einen Düsenträger 60 auf, der im gezeigten Ausführungsbeispiel von länglicher Gestalt ist und in einer entsprechenden Aussparung 62 der Polyurethanauskleidung 52 bündig oder jedenfalls annähernd bündig mit der Innenfläche der Polyurethanauskleidung 52 angeordnet ist. Der Düsenträger 60 besteht beim beschriebenen Ausführungsbeispiel aus nicht rostendem Stahl und weist, wie insbesondere aus Figur 3 und Figur 4 gut zu ersehen, zwei Einsätze 64 auf, in denen je zwei Flüssigkeitseinspritzdüsen 66 ausgebildet sind, d.h. die Flüssigkeitseinspritzeinrichtung 38 hat im dargestellten Ausführungsbeispiel vier Einspritzdüsen 66. Die Einsätze 64 sind im beschriebenen Ausführungsbeispiel aus Polyurethan gefertigt, können jedoch auch aus einem anderen geeigneten Kunststoff oder Metall hergestellt sein. Gemäß einer nicht dargestellten, abgewandelten Ausführungsform können die Einspritzdüsen 66 auch im Düsenträger 60 selbst ausgebildet sein.The liquid injection device 38 is also constructed so that deposits in the mixing chamber 18 are avoided as far as possible in their area. For this purpose, the liquid injection device 38 has a nozzle carrier 60, which in the exemplary embodiment shown is of elongate shape and is arranged in a corresponding recess 62 of the polyurethane lining 52 flush or at least approximately flush with the inner surface of the polyurethane lining 52. The nozzle carrier 60 is in the described embodiment of stainless steel and has, as can be seen well in particular from Figure 3 and Figure 4, two inserts 64, in each of which two liquid injection nozzles 66 are formed, i. the liquid injection device 38 has four injection nozzles 66 in the illustrated embodiment. The inserts 64 are made of polyurethane in the described embodiment, but may also be made of another suitable plastic or metal. According to a modified embodiment, not shown, the injection nozzles 66 may also be formed in the nozzle carrier 60 itself.

Alle Einspritzdüsen 66 können denselben Einspritzwinkel aufweisen. Vorzugsweise haben die Flüssigkeitseinspritzdüsen 66 jedoch unterschiedliche Einspritzwinkel, insbesondere paarweise unterschiedliche Einspritzwinkel, um eine gleichmäßigere und schnellere Durchfeuchtung des zu vermischenden Materials in der Mischkammer 18 zu erreichen. Obwohl nicht dargestellt versteht es sich, dass der Düsenträger 60 mehr als nur zwei Einsätze 64 aufweisen kann, dass jeder Einsatz 64 eine oder mehrere Einspritzdüsen 66 umfassen kann, dass die Einspritzdüsen 66 eines Einsatzes 64 gleiche oder unterschiedliche Einspritzwinkel aufweisen können, und dass, falls gewünscht oder erforderlich, auch mehrere Düsenträger 60 vorgesehen sein können.All injectors 66 may have the same injection angle. Preferably, however, the liquid injection nozzles 66 have different injection angles, in particular pairs of different injection angles, in order to achieve a more even and faster through-wetting of the material to be mixed in the mixing chamber 18. Although not shown, it is understood that the nozzle carrier 60 may include more than two inserts 64, that each insert 64 may include one or more injectors 66, that the injectors 66 of an insert 64 may have equal or different injection angles, and that if desired or required, even more nozzle carrier 60 may be provided.

Der Düsenträger 60 wird im gezeigten Beispiel von zwei Senkkopfschrauben 68 gehalten, deren Schaft sich radial nach außen durch den Düsenträger 60, die Polyurethanauskleidung 52, den Hohlzylinder 54, ein Verteilerelement 70 und einen Befestigungsflansch 72 erstreckt. Alternativ können am Düsenträger 60 auch entsprechende Gewindebolzen fest angebracht sein.The nozzle carrier 60 is held in the example shown by two countersunk screws 68, the shaft extends radially outwardly through the nozzle carrier 60, the polyurethane lining 52, the hollow cylinder 54, a distributor element 70 and a mounting flange 72. Alternatively, corresponding thread bolts can be firmly attached to the nozzle carrier 60.

Der Befestigungsflansch 72 ist mit dem Ende einer Speiseleitung 74 verbunden, durch die Flüssigkeit zur Flüssigkeitseinspritzeinrichtung 38 geführt wird. Das Ende der Speiseleitung 74 mündet in das zwischen dem Befestigungsflansch 72 und dem Hohlzylinder 54 angeordnete Verteilerelement 70, welches innen so ausgebildet ist, z.B. durch entsprechende Kanäle oder geeignete Aussparungen, dass die Flüssigkeit aus der Speiseleitung 74 den einzelnen Flüssigkeitseinspritzdüsen 66 durch entsprechende Öffnungen im Hohlzylinder 54 und der Polyurethanauskleidung 52 zugeleitet wird. Zugleich sorgt das Verteilerelement 70 für eine Abdichtung zwischen der Speiseleitung 74 und der Außenseite der Mischkammer 18, genauer ihres Hohlzylinders 54. Das Verteilerelement 70 besteht vorzugsweise aus einem Material wie Gummi oder Kunststoff, z.B. Polyurethan, das ausreichend elastisch ist, um eine gute Abdichtung zu gewährleisten, und in das die erforderlichen Kanäle oder Aussparungen einfach eingebracht werden können.The mounting flange 72 is connected to the end of a feed line 74, is passed through the liquid to the liquid injection device 38. The end of the feed line 74 opens into the distributor element 70 arranged between the fastening flange 72 and the hollow cylinder 54, which is formed inside, e.g. by appropriate channels or suitable recesses, that the liquid from the feed line 74 to the individual liquid injection nozzles 66 is fed through corresponding openings in the hollow cylinder 54 and the polyurethane liner 52. At the same time, the distributor element 70 provides a seal between the feed line 74 and the outside of the mixing chamber 18, more precisely its hollow cylinder 54. The distributor element 70 is preferably made of a material such as rubber or plastic, e.g. Polyurethane, which is sufficiently elastic to ensure a good seal, and in which the required channels or recesses can be easily introduced.

Mittels der Schrauben 68 und Muttern 76 (siehe Figuren 3 und 4) wird das Verteilerelement 70 zwischen dem Befestigungsflansch 72 und der Außenseite des Hohlzylinders 54 verspannt. Sollen die Einsätze 64 herausgenommen werden, beispielsweise um sie zu reinigen oder auszuwechseln, brauchen somit nur die Muttern 76 gelöst zu werden und es kann dann der Düsenträger 60 mit den Einsätzen 64 nach innen herausgenommen werden.By means of the screws 68 and nuts 76 (see FIGS. 3 and 4), the distributor element 70 is braced between the fastening flange 72 and the outside of the hollow cylinder 54. Thus, if the inserts 64 are to be removed, for example, to clean or replace them, only the nuts 76 need to be loosened, and then the nozzle carrier 60 with the inserts 64 can be removed inwardly.

Um Materialablagerungen auch im Bereich des Pumpenflansches 20 zu verhindern, ist der Pumpenflansch 20 auf seiner der Mischkammer 18 zugekehrten Seite im gesamten materialführenden Bereich mit einer Abdeckung 78 aus Polyurethan versehen, die im gezeigten Ausführungsbeispiel durch ein Polyurethanformteil 80 gebildet ist, welches in eine zentrale Durchgangsöffnung des Pumpenflansches 20 eingeknöpft ist, durch die auch der Stummel 46 des Rotors 48 in die Mischkammer 18 ragt. Das Polyurethanformteil 80 ist der Form der Durchgangsöffnung angepasst und so gestaltet, dass es nach dem Einknöpfvorgang sicher am Pumpenflansch 20 befestigt bleibt. Wie insbesondere aus Figur 5 zu ersehen, ist das Polyurethanformteil 80 auf beiden Seiten des Pumpenflansches 20 radial jeweils so weit nach außen gezogen, dass es auf der der Mischkammer 18 zugewandten Seite mit der radial inneren Dichtungslippe 58 in Kontakt kommt und auf der der Exzenterschneckenpumpe 22 zugewandten Seite als Dichtung zwischen einem Stator 82 der Exzenterschneckenpumpe 22 und dem Pumpenflansch 20 dienen kann. Wie in Figur 5 dargestellt, ist mischkammerseitig ein kreisringförmiger Abschnitt 84 des Polyurethanformteils 80 in einer entsprechenden Ausnehmung des Pumpenflansches 20 aufgenommen, wobei diese Ausnehmung radial nur soweit nach außen reicht, dass die radial äußere Dichtungslippe 59 der Polyurethanauskleidung 52 nicht mehr mit dem kreisringförmigen Abschnitt 84, sondern mit dem Metall des Pumpenflansches 20 in Berührung tritt. Alternativ kann die Abdeckung 78 auch durch Aufspritzen von PU-Material auf den Pumpenflansch 20 erzielt werden (nicht dargestellt).In order to prevent material deposits in the area of the pump flange 20, the pump flange 20 is provided on its side facing the mixing chamber 18 throughout the material-carrying area with a cover 78 made of polyurethane, which is formed in the illustrated embodiment by a polyurethane molding 80, which in a central through hole the pump flange 20 is buttoned, through which also the stub 46 of the rotor 48 projects into the mixing chamber 18. The polyurethane molding 80 is adapted to the shape of the through hole and designed so that it remains securely attached to the pump flange 20 after the Einknöpfvorgang. As can be seen in particular from FIG. 5, the polyurethane molded part 80 is pulled radially on both sides of the pump flange 20 so far outward in each case, that it comes into contact with the radially inner sealing lip 58 on the side facing the mixing chamber 18 and can serve as a seal between a stator 82 of the eccentric screw pump 22 and the pump flange 20 on the side facing the eccentric screw pump 22. As shown in FIG. 5, an annular section 84 of the polyurethane molded part 80 is received in the mixing chamber side in a corresponding recess of the pump flange 20, this recess extending radially outwardly only to the extent that the radially outer sealing lip 59 of the polyurethane lining 52 no longer engages with the annular section 84 but comes into contact with the metal of the pump flange 20. Alternatively, the cover 78 can also be achieved by spraying PU material onto the pump flange 20 (not shown).

Schließlich ist bei der gezeigten Mörtelmischpumpe 10 noch der Bereich des Motorflansches 28 auf besondere Weise gegen Ablagerungen geschützt. Wie gut aus Figur 6 zu erkennen, ist hierzu die dem Trichter 12 zugewandte Seite des Motorflansches 28 mit einer Polyurethanverkleidung 86 versehen, die zum einen den Motorflansch 28 gegenüber der Außenseite des Trichters 12 abdichtet und die zum anderen mittels einer an sie angeformten, schräg nach innen in Richtung des Trichters 12 vorstehenden, ringförmigen Dichtlippe 88 für eine Abdichtung zur sich drehenden Motorkupplung 24 sorgt. Die Polyurethanverkleidung 86 ist, abgesehen von der an sie angeformten Dichtlippe 88, ein kreisringscheibenförmiges Teil, das beispielsweise nach Art eines Bajonettverschlusses auf dem Motorflansch 28 befestigt ist. Es stellt eine effektive Abdichtung zwischen dem Innenraum des Trichters 12 und dem Elektromotor 16 dar und verhindert gleichzeitig, dass sich in diesem Bereich unerwünschte Materialablagerungen bilden.Finally, in the mortar mixing pump 10 shown, the area of the motor flange 28 is still protected in a special way against deposits. As can readily be seen from FIG. 6, the side of the motor flange 28 facing the funnel 12 is provided with a polyurethane covering 86, which on the one hand seals the motor flange 28 with respect to the outside of the funnel 12 and on the other hand by means of an integrally formed, obliquely inside the direction of the funnel 12 projecting annular sealing lip 88 provides a seal to the rotating engine clutch 24. The polyurethane covering 86 is, apart from the molded-on sealing lip 88, an annular disc-shaped part, which is fastened for example in the manner of a bayonet lock on the motor flange 28. It provides an effective seal between the interior of the funnel 12 and the electric motor 16 and at the same time prevents unwanted material deposits from forming in this area.

Claims (16)

  1. Mortar mixing pump (10) with a motor-driven conveyor screw (14) for guidance of material to be mixed into a mixing chamber (18) which is provided with a lining (52) of rubber or plastic, is arranged at least essentially coaxial with the conveyor screw (14) and can be supplied with liquid through one or more liquid injection nozzles, wherein the mixing chamber (18) incorporates a mixing element (36) designed to rotate with the conveyor screw (14) in order to mix the material conveyed into the mixing chamber (18) with the liquid, and wherein the end of the mixing chamber (18) remote from the conveyor screw (14) is bounded by a pump flange (20) designed for connection to a pump (22), wherein the conveyor screw (14) is arranged in a funnel (12) for introduction of the material to be mixed, and wherein the lining (52) of the mixing chamber (18) is in direct contact with the funnel (12) and with the surface of the pump flange (20),
    characterised in that
    - the mixing chamber (18) is a component which is separate from the funnel (12) and the pump flange (20) and connected to the funnel (12),
    - a plurality of liquid injection nozzles (66) is incorporated in a nozzle carrier (60) which is arranged in a recess in the lining (52) at least roughly flush with the internal face of the lining (52) and fastened detachably by fastening means which are accessible from outside the mixing chamber (18).
  2. Mortar mixing pump according to claim 1, characterised in that on its side facing the mixing chamber (18) the pump flange (20) is provided with a covering (78) of polyurethane, polyethylene or silicone over the entire mortar-guiding area.
  3. Mortar mixing pump according to claim 1 or 2, characterised in that the liquid injection nozzles (66) exhibit different injection angles.
  4. Mortar mixing pump according to one of claims 1 to 3, characterised in that the liquid injection nozzles (66) are formed in the nozzle carrier (60) itself.
  5. Mortar mixing pump according to one of claims 1 to 3, characterised in that the liquid injection nozzles (66) take the form of separate inserts (64) supported by the nozzle carrier (60).
  6. Mortar mixing pump according to claim 5, characterised in that each insert (64) comprises a plurality of liquid injection nozzles (66).
  7. Mortar mixing pump according to claim 5 or 6, characterised in that the liquid injection nozzles (66) of an insert (64) in each case exhibit the same injection angle.
  8. Mortar mixing pump according to one of claims 5 to 7, characterised in that each insert (64) is made of polyurethane, polyethylene or silicone.
  9. Mortar mixing pump according to one of claims 4 or 5 to 8, characterised in that a common feed line (74) supplies liquid to all the liquid injection nozzles (66) associated with a nozzle carrier (60).
  10. Mortar mixing pump according to claim 9, characterised in that a distributor element (70) interposed between the end of the feed line (74) and the nozzle carrier (60) feeds liquid from the feed line (74) to the individual liquid injection nozzles (66).
  11. Mortar mixing pump according to claim 10, characterised in that the distributor element (70) also provides a seal between the feed line (74) and the outside of the mixing chamber (18).
  12. Mortar mixing pump according to one of the preceding claims, characterised in that the covering (78) of the pump flange (20) is formed by a moulding (80) which is made of polyurethane, polyethylene or silicone and clipped into a through opening.
  13. Mortar mixing pump according to one of the preceding claims, characterised in that the conveyor screw (14) exhibits a sheath (32) made of polyurethane, polyethylene or silicone.
  14. Mortar mixing pump according to one of the preceding claims, characterised in that on its side facing the funnel a motor flange (28) adjacent to the end of the conveyor screw (14) remote from the mixing chamber exhibits a lining (86) of polyurethane, polyethylene or silicone.
  15. Mortar mixing pump according to claim 14, characterised in that a sealing lip (88) for sealing in relation to a shaft driving the conveyor screw (14) is moulded to the lining (86).
  16. Mortar mixing pump according to one of the preceding claims, characterised in that the lining (52) is made of polyurethane, polyethylene, silicone or a coated composite material comprising one of the previously named materials and rubber.
EP04718929A 2003-03-14 2004-03-10 Mortar mixing pump Expired - Lifetime EP1603720B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10311342 2003-03-14
DE10311342A DE10311342B3 (en) 2003-03-14 2003-03-14 Cement/mortar mixing pump, especially for use in tunneling, has a mixing chamber with the impeller screw and liquid jets and a funnel for filling, which is less likely to clog giving reduced cleaning
PCT/EP2004/002458 WO2004080676A1 (en) 2003-03-14 2004-03-10 Mortar mixing pump

Publications (2)

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EP1603720A1 EP1603720A1 (en) 2005-12-14
EP1603720B1 true EP1603720B1 (en) 2006-06-28

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EP04718929A Expired - Lifetime EP1603720B1 (en) 2003-03-14 2004-03-10 Mortar mixing pump

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EP (1) EP1603720B1 (en)
JP (1) JP4708328B2 (en)
KR (1) KR100963999B1 (en)
AT (1) ATE331596T1 (en)
DE (2) DE10311342B3 (en)
DK (1) DK1603720T3 (en)
WO (1) WO2004080676A1 (en)

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CN106182430A (en) * 2016-07-18 2016-12-07 蚌埠市方阵商品混凝土有限公司 A kind of concrete agitator

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DE502004000888D1 (en) 2006-08-10
JP4708328B2 (en) 2011-06-22
KR20050114613A (en) 2005-12-06
JP2006523149A (en) 2006-10-12
DE10311342B3 (en) 2004-08-26
EP1603720A1 (en) 2005-12-14
DK1603720T3 (en) 2006-07-31
KR100963999B1 (en) 2010-06-15
ATE331596T1 (en) 2006-07-15
WO2004080676A1 (en) 2004-09-23

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