EP0147631B1 - Dry cement mixing installation - Google Patents

Dry cement mixing installation Download PDF

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Publication number
EP0147631B1
EP0147631B1 EP84114191A EP84114191A EP0147631B1 EP 0147631 B1 EP0147631 B1 EP 0147631B1 EP 84114191 A EP84114191 A EP 84114191A EP 84114191 A EP84114191 A EP 84114191A EP 0147631 B1 EP0147631 B1 EP 0147631B1
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EP
European Patent Office
Prior art keywords
conveying
mixing
shaft
dry mortar
plant according
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
Application number
EP84114191A
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German (de)
French (fr)
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EP0147631A2 (en
EP0147631A3 (en
Inventor
Wilfried Wiesböck
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.)
BHS Bayerische Berg Hutten und Salzwerke AG
Original Assignee
BHS Bayerische Berg Hutten und Salzwerke AG
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Publication date
Application filed by BHS Bayerische Berg Hutten und Salzwerke AG filed Critical BHS Bayerische Berg Hutten und Salzwerke AG
Priority to AT84114191T priority Critical patent/ATE45539T1/en
Publication of EP0147631A2 publication Critical patent/EP0147631A2/en
Publication of EP0147631A3 publication Critical patent/EP0147631A3/en
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Publication of EP0147631B1 publication Critical patent/EP0147631B1/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
    • B01F27/62—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 dry mortar mixing system according to the preamble of claim 1.
  • Such dry mortar mixing systems have been known for a long time and include a delivery and a downstream mixing chamber (cf. US-A-1 689 963).
  • a silo as a storage container for the dry mortar can be connected to a front end of the dry mortar mixing system via a vertical nozzle, via which the mix flows vertically down into the first feed channel and is transported there via a screw conveyor in a feed pipe to the downstream mixing channel.
  • the water can then be added to the mixing channel itself, so that the finished mix can finally be removed in the mixing chamber.
  • the conveyor shaft provided with the screw conveyor and the downstream mixer shaft carrying the mixing blades are plugged into one another at the end face via an intake port, so that the conveyor and mixing shaft rotate together.
  • the object of the invention is therefore to overcome the disadvantages of the prior art and to improve a dry mortar mixing plant of the type mentioned in such a way that the total service life is significantly increased compared to the prior art and, moreover, an easier and faster introduction and Removal of all parts, for example, for cleaning and replacement is guaranteed.
  • the object is achieved according to the features specified in the characterizing part of claim 1.
  • Advantageous embodiments of the invention are specified in the subclaims.
  • the dry mortar mixing plant according to the invention achieves significant advantages over the prior art.
  • the total service life of the mixing plant is increased many times over compared to the prior art, since the described wear and abrasion effects, in particular between the screw conveyor and the feed pipe surrounding it, are avoided by the arrangement according to the invention.
  • the essential advantage is also achieved that the distance between the outer edge of the screw conveyor and the surrounding conveyor pipe can be more than 3 mm, preferably 4 to 10 mm and more. This is therefore possible that the conveyor tube no longer has to serve as a centering device to limit the vibrations, so that it is reliably ensured that the outer edge of the screw conveyor no longer strikes the conveyor tube. In particular, this dimension also enables dry discharge without technical problems.
  • a common bearing is provided at the front end of the conveyor tube for the mixing shaft and conveyor shaft arranged one behind the other in the axial direction, the coupling according to claim 4 being effected via a coupling hub.
  • a simple technical possibility for installing and removing the delivery pipe is also provided, which is mounted in the outer jacket so that it can be pulled out axially, for which purpose in a further development according to Claim 6 at least two radial holding devices arranged axially at a distance from one another and fastened to the outer jacket are provided.
  • the holding device facing the bearing is provided with a centering flange which comes into contact in a corresponding annular fold of the holding device, but the inner circumference of the holding device is contactless ends in front of the outer casing of the delivery pipe. Therefore, the feed pipe can be easily axially inserted into its installed position in the axial direction, and finally precisely adjusted via its flange.
  • the dry mortar mixing plant is shown in longitudinal section in a schematic representation and comprises a conveying channel 1 and a downstream mixing channel 3.
  • a vertical container or silo (not shown in more detail) for the dry mortar is connected via a vertical attachment flange 5.
  • a releasable delivery pipe 9 is installed in the delivery channel 1 via two radial holding devices 7a and 7b arranged at an axial distance from one another.
  • the associated conveyor shaft 11 with the conveyor screw 13 attached to it is axially symmetrical to the conveyor pipe 9.
  • the conveyor screw 13 is driven by a drive unit, a motor 15, which in the exemplary embodiment shown is mounted on the left end face of the dry mortar mixing system via an associated shaft journal 17 and stored.
  • the bearing 19 further includes a connecting hub 21, in which the front end of the conveyor shaft 11 engages in a corresponding bore 23.
  • an outlet opening 27 for the conveyed and mixed material is provided, the outlet opening 27 being arranged between the holding and centering device 7b and the front end 25.
  • the mixing shaft 29 is also guided at the end facing the delivery channel 1 in the connecting hub 21 and at the opposite end 35 in a front bearing 37 arranged there.
  • the material to be mixed is discharged downwards via an outlet channel 39 arranged in front of the end 35.
  • the mix is fed via the mentioned and not shown silo container to the delivery channel 1 via the attachment flange 5.
  • the conveyor shaft 11 is set in rotation via the motor 5, so that the mix is conveyed further via conveyor vanes 41 below the attachment flange 5 into the conveyor tube 9.
  • Due to the rotation of the screw conveyor with the delivery pipe 9 arranged in a rotationally fixed manner the material to be mixed is transported further through it and is discharged at its front end in front of the bearing 19 through the lower outlet opening 27 into the subsequent mixing chamber or the mixing channel 3, the lower wall of the mixing channel 3 is arranged lower than the corresponding lower wall of the delivery pipe 9.
  • the delivery pipe 9 is installed axially symmetrically to a surrounding outer jacket 43, which at the same time represents the outer wall of the mixing channel 3.
  • the conveying channel 1 with the conveying shaft 11 represents a metering device for the uniform feeding of mixed material.
  • the mixing shaft 29 is driven via the connecting hub 21 together with the screw conveyor, the mix being conveyed, if appropriate with the addition of water, via the water inlet connection 33 to the front end 35 of the mixing channel 3 and then discharged via the outlet channel 39.
  • short blades 31a are also provided for the further transport of the conveyed material, which are connected to an adjacent one on the mixing shaft 29 seated transport and mixing vanes 31 are attached and encircle the part of the delivery pipe 9 which projects into the mixing channel 3.
  • the conveying shaft 11 and the mixing shaft 29 are not only held and guided securely not only at their outer end, but also jointly at their mutually facing end via a common bearing 19.
  • the vibrations of the entire arrangement can be significantly minimized.
  • the conveyor tube 9 thus also no longer has to assume a centering function for the screw conveyor 13 and the conveyor shaft 11, it is possible for the outer edges 45 of the conveyor screw 13 to end at a distance 46 from the inside of the conveyor tube 9.
  • the distance can be more than 3 mm, preferably 4 to 10 mm and, if necessary, more.
  • a jamming of sand grains and the grains, in particular in the so-called dry discharge between the outer edge 45 and the inside of the conveyor tube 9, is thereby reliably avoided. Furthermore, this ensures a completely uniform metering of the mixture to be supplied, so that the mixture discharged at the outlet 39 always has the same mixing ratio with the water supplied.
  • the feed pipe 9 can also be easily removed if necessary after screws 57 are removed, via which a centering flange 59 welded to the outer circumference of the feed pipe 9 is firmly connected to the second holding device 7b.
  • the holding device 7b ends at a distance from the outer circumference of the delivery pipe 9, so that the delivery pipe 9 can be easily installed or removed in the axial direction from the mixing chamber by this holding device 7b.
  • the delivery pipe 9 is centered via the centering flange 59, which comes to rest in an appropriately dimensioned annular fold 61 of the holding device 7b in the installed state.
  • the first holding device 7b is merely designed as a pipe socket 63 welded to the inside of the outer jacket 43 for further centering.
  • the connecting hub 21 is provided on the end face with at least one radial groove 53, into which corresponding drivers 55 of the mixing shaft 29 or the conveying shaft 11 are inserted by being pushed axially into one another. This ensures the common rotation from the drive unit 15 to the mixing shaft 29.
  • the delivery pipe 9 at the end facing the motor 15 is likewise axially essentially non-displaceable in a shaft journal 17 and the mixing shaft 29 is also secured against axial displacement at its opposite end 35 in a manner not shown, no further is required technical measures to prevent that the connecting hub 21 is not axially displaced, since this is automatically and automatically centered by the inserted driver 55 on the conveyor and mixing shaft.
  • the outer jacket - as shown in the figure - can also be divided into two, with a split in the area of the holding device 7b offering itself.
  • a quick-release fastener 58 By loosening a quick-release fastener 58, with the mixing shaft 29 already removed, the outer jacket can then be lowered in the area of the mixing shaft by a lower pivot bearing 59.

Abstract

1. Dry mortar mixing plant with a substantially horizontal conveying duct and a mixing duct (1, 3) axially adjacent thereto, a non-rotatably installed conveying tube (9), in which the mix material which can be supplied via a supply nozzle can be conveyed by means of a conveying shaft (11) which is actuated by a driving arrangement (15) and provided with a conveying screw (13), and with a mixing shaft (29) which is rotatably arranged in the mixing duct (3), is provided with conveying mixing blades (31), rotates together with the conveying shaft (11) and is coupled thereto, and with an outlet opening for the mix material arranged at the end of the mixing duct (3) remote from the supply nozzle, characterised in that a central bearing (19) for the conveying shaft (11) and the mixing shaft (29) is provided at the front end of the conveying tube (9), as viewed in the conveying direction, and in that an outlet opening (27) for the mix material is made below, at the end of the conveying tube (9), before the bearing (19), the bottom wall of the following mixing duct (3) being arranged lower than the bottom wall of the conveying tube (9).

Description

Die Erfindung betrifft eine Trockenmörtel-Mischanlage nach dem Oberbegriff des Anspruchs 1.The invention relates to a dry mortar mixing system according to the preamble of claim 1.

Derartige Trockenmörtel-Mischanlagen sind bereits seit langem bekannt und umfassen eine Förder- und eine nachgeordnete Mischkammer (vgl. US-A-1 689 963). Über einen Vertikalstutzen ist an einem vorderen Ende der Trockenmörtel-Mischanlage ein Silo als Vorratsbehälter für den Trockenmörtel anschließbar, über den das Mischgut vertikal in den ersten Förderkanal herabströmt und dort über eine Förderschnecke in einem Förderrohr zu dem nachgeordneten Mischkanal weitertransportiert wird. In den Mischkanal selbst kann dann das Wasser zugesetzt werden, so daß das fertige Mischgut am Ende in der Mischkammer abgenommen werden kann. Die mit der Förderschnecke versehene Förderwelle und die nachgeordnete, die Mischflügel tragende Mischwelle sind dabei stirnseitig über einen Ansaugstutzen ineinander gesteckt, so daß Förder- und Mischwelle gemeinsam drehen. Da das Fördergut über die Förderschnecke im Förderrohr stirnseitig in die Mischkammer austritt, kann an dieser Stelle beim Übergang von der Förder- zur Mischwelle kein Lager vorgesehen sein. Dies hat aber den schwerwiegenden Nachteil in sich, daß die gesamte Anordnung aus ineinander gesteckten Förder- und Mischwelle enorm starken Schwingungen und Vibrationen ausgesetzt ist. Vor allem aber muß nach jedem Arbeitstag die Mischwelle zur Reinigung ausgebaut werden. Da aber die Mischwelle mit einem stirnseitig herausragenden Zapfen an dem anliegenden Stirnende der Förderwelle in eine entsprechende Bohrung eingesteckt ist, die zur Vermeidung von starken Schwingungen möglichst paßgenau ausgebildet sein muß, ist verständlich, daß das Lösen und Ineinanderstekken von Misch- und Förderwelle im Einsatz auf den Baustellen häufig fast nicht möglich ist. Ein weiterer schwerwiegender Nachteil liegt aber darin begründet, daß der Abstand zwischen der Außenkante der Förderschnecke und dem sie umgebenden Förderrohr so minimal als möglich sein soll, damit hierdurch größere Vibrationen und Schwingungen der Förderschnecke unterbunden werden können. Dies hat aber in der Praxis zur Folge, daß die Außenkante der Förderschnecke aufgrund der dennoch auftretenden Schwingungen häufig bereits nach 300 Stunden Betriebszeit das sie umgebende Förderrohr durchschlagen und ausgewetzt hat, so daß aufgrund der aufgetretenen Schäden sowohl die Förderschnecke als auch das sie umgebende Förderrohr wieder ausgebaut und die Teile neu eingeschweißt werden müssen. Soll fernerhin bei Bedarf auch ein sogenannter Trockenaustrag ohne Zuführung von Wasser im Mischteil vorgenommen werden, so ist es häufig aufgrund der Dicke der verwandten Sandkörner von beispielsweise 4 bis 5 mm und bei Körnungen bis zu etwa 10 mm Kantenlänge nicht möglich, da diese Körnungen zwischen der Außenkante der Förderschnecke und dem sie umgebenden Förderrohr zu einem Verklemmen der gesamten Förderanordnung führen.Such dry mortar mixing systems have been known for a long time and include a delivery and a downstream mixing chamber (cf. US-A-1 689 963). A silo as a storage container for the dry mortar can be connected to a front end of the dry mortar mixing system via a vertical nozzle, via which the mix flows vertically down into the first feed channel and is transported there via a screw conveyor in a feed pipe to the downstream mixing channel. The water can then be added to the mixing channel itself, so that the finished mix can finally be removed in the mixing chamber. The conveyor shaft provided with the screw conveyor and the downstream mixer shaft carrying the mixing blades are plugged into one another at the end face via an intake port, so that the conveyor and mixing shaft rotate together. Since the material to be conveyed emerges from the end into the mixing chamber via the screw conveyor in the conveying pipe, no bearing can be provided at this point during the transition from the conveying shaft to the mixing shaft. However, this has the serious disadvantage that the entire arrangement of the conveying and mixing shaft inserted into one another is exposed to extremely strong oscillations and vibrations. Above all, however, the mixing shaft must be removed for cleaning after each working day. However, since the mixing shaft with a pin projecting on the end face is inserted into a corresponding bore at the abutting front end of the feed shaft, which must be designed to be as precise as possible to avoid strong vibrations, it is understandable that the loosening and intermeshing of the mixing and feed shaft in use the construction sites is often almost impossible. Another serious disadvantage lies in the fact that the distance between the outer edge of the screw conveyor and the surrounding conveyor pipe should be as minimal as possible, so that larger vibrations and vibrations of the screw conveyor can be prevented. In practice, however, this has the consequence that the outer edge of the screw conveyor often breaks through and expands the conveyor tube surrounding it after 300 hours of operation due to the vibrations which nevertheless occur, so that both the conveyor screw and the conveyor tube surrounding it again due to the damage which has occurred removed and the parts welded in again. Furthermore, if so-called dry discharge is to be carried out in the mixing section without the addition of water, it is often not possible due to the thickness of the sand grains used, for example 4 to 5 mm, and for grain sizes up to approximately 10 mm edge length, since these grain sizes between the Lead the outer edge of the screw conveyor and the surrounding conveyor tube to jam the entire conveyor assembly.

Aufgabe der Erfindung ist es nun daher, die Nachteile nach dem Stand der Technik zu überwinden und eine Trockenmörtel-Mischanlage der genannten Art so zu verbessern, daß die gesamte Standzeit gegenüber dem Stand der Technik deutlich erhöht wird und zudem ein leichter und schneller Ein- und Ausbau der gesamten Teile beispielsweise zum Reinigen und Ersatz gewährleistet ist. Die Aufgabe wird erfindungsgemäß entsprechend den im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmalen gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.The object of the invention is therefore to overcome the disadvantages of the prior art and to improve a dry mortar mixing plant of the type mentioned in such a way that the total service life is significantly increased compared to the prior art and, moreover, an easier and faster introduction and Removal of all parts, for example, for cleaning and replacement is guaranteed. The object is achieved according to the features specified in the characterizing part of claim 1. Advantageous embodiments of the invention are specified in the subclaims.

Durch die erfindungsgemäße Trockenmörtel-Mischanlage werden gegenüber dem Stand der Technik wesentliche Vorteile erzielt. Zum einen wird die gesamte Standzeit der Mischanlage gegenüber dem Stand der Technik um ein Vielfaches erhöht, da die geschilderten Abnutzungs- und Abriebseffekte insbesondere zwischen Förderschnecke und des sie umgebenden Förderrohrs durch die erfindungsgemäße Anordnung vermieden werden. Dies ergibt sich dadurch, daß die Förderschnecke am Übergang vom Fcrder- zum Mischteil an ihrem, stirnseitigen Ende in einem dort zusätzlich angeordneten Lager geführt ist, und das Fördergut nunmehr nicht mehr über eine axiale, sondern eine sich in der Förderkammer unten befindliche Austrittsöffnung in die nachfolgende Mischkammer abgegeben wird. Hierdurch lassen sich die Schwingungen deutlich vermindern.The dry mortar mixing plant according to the invention achieves significant advantages over the prior art. On the one hand, the total service life of the mixing plant is increased many times over compared to the prior art, since the described wear and abrasion effects, in particular between the screw conveyor and the feed pipe surrounding it, are avoided by the arrangement according to the invention. This results from the fact that the screw conveyor at the transition from the conveying part to the mixing part is guided at its front end in a bearing additionally arranged there, and the material to be conveyed is no longer fed into the conveying opening via an axial one but in the bottom of the conveying chamber subsequent mixing chamber is dispensed. As a result, the vibrations can be significantly reduced.

Erfindungsgemäß wird dabei auch der wesentliche Vorteil gemäß Anspruch 2 erzielt, daß der Abstand zwischen der Außenkante der Förderschnecke und dem umgebenden Förderrohr mehr als 3 mm, vorzugsweise 4 bis 10 mm und mehr betragen kann. Dies ist deshalb möglich, daß das Förderrohr nunmehr nicht mehr zusätzlich noch zur Beschränkung der Schwingungen als Zentriervorrichtung dienen muß, so daß sicher gewährleistet ist, daß die Außenkante der Förderschnecke an dem Förderrohr nicht mehr anschlägt. Insbesondere ist durch diese Abmessung auch ein Trockenaustrag ohne technische Probleme möglich.According to the invention, the essential advantage is also achieved that the distance between the outer edge of the screw conveyor and the surrounding conveyor pipe can be more than 3 mm, preferably 4 to 10 mm and more. This is therefore possible that the conveyor tube no longer has to serve as a centering device to limit the vibrations, so that it is reliably ensured that the outer edge of the screw conveyor no longer strikes the conveyor tube. In particular, this dimension also enables dry discharge without technical problems.

In einer bevorzugten Ausführungsform nach Anspruch 3 ist für die in Axialrichtung hintereinander angeordnete Mischwelle und Förderwelle ein gemeinsames Lager am stirnseitigen Ende des Förderrohres vorgesehen, wobei die Ankopplung gemäß Anspruch 4 über eine Kupplungsnabe erfolgt. Auch hierdurch läßt sich problemlos ein Ein- und Ausbau der Mischwelle gewährleisten, da diese nunmehr nicht mehr über einen vorstehenden stirnseitigen Zapfen in eine entsprechend paßgenau ausgebildete Bohrung in der Förderwelle eingesteckt werden muß.In a preferred embodiment according to claim 3, a common bearing is provided at the front end of the conveyor tube for the mixing shaft and conveyor shaft arranged one behind the other in the axial direction, the coupling according to claim 4 being effected via a coupling hub. This also ensures that the mixing shaft can be installed and removed without any problems, since it no longer has to be inserted into a correspondingly precisely formed bore in the conveyor shaft via a protruding front pin.

In einer Weiterbildung der Erfindung nach Anspruch 5 wird auch eine einfache technische Möglichkeit zum Ein- und Ausbau des Förderrohres geschaffen, der im Außenmantel axial ausziehbar gelagert ist, wozu in einer Weiterbildung nach Anspruch 6 zumindest zwei axial im Abstand von einander angeordnete und an dem Außenmantel befestigte radiale Halteeinrichtungen vorgesehen sind.In a further development of the invention according to claim 5, a simple technical possibility for installing and removing the delivery pipe is also provided, which is mounted in the outer jacket so that it can be pulled out axially, for which purpose in a further development according to Claim 6 at least two radial holding devices arranged axially at a distance from one another and fastened to the outer jacket are provided.

Der einfache Ein- und Ausbau des Förderrohres ergibt sich in der bevorzugten Ausführungsform nach Anspruch 7 auch dadurch, daß die dem Lager zugewandte Halteeinrichtung mit einem Zentrierflansch versehen ist, der in einem entsprechenden Ringfalz der Halteeinrichtung zu Anlage kommt, wobei aber der Innenumfang der Halteeinrichtung berührungslos vor dem Außenmantel des Förderrohres endet. Von daher läßt sich das Förderrohr in Axialrichtung leicht axial in seine Einbaulage einführen, und schließlich über seinen Flansch exakt justieren.The simple installation and removal of the delivery pipe results in the preferred embodiment according to claim 7 also in that the holding device facing the bearing is provided with a centering flange which comes into contact in a corresponding annular fold of the holding device, but the inner circumference of the holding device is contactless ends in front of the outer casing of the delivery pipe. Therefore, the feed pipe can be easily axially inserted into its installed position in the axial direction, and finally precisely adjusted via its flange.

Weitere Vorteile, Einzelheiten und Merkmale der Erfindung ergeben sich nachfolgend an dem anhand einer Zeichnung dargestellten Ausführungsbeispiel.Further advantages, details and features of the invention result from the exemplary embodiment shown in the drawing.

In der Zeichnung ist die Trockenmörtel-Mischanlage im Längsschnitt in schematischer Darstellung gezeigt und umfaßt einen Förderkanal 1 und einen nachgeordneten Mischkanal 3. Über einen vertikalen Ansatzflansch 5 wird ein nicht näher gezeigter vertikaler Container oder Silo für den Trockenmörtel angeschlossen. In dem Förderkanal 1 ist über zwei im axialen Abstand voneinander angeordnete radiale Halteeinrichtungen 7a und 7b ein lösbares Förderrohr 9 eingebaut. Axialsymmetrisch zu dem Förderrohr 9 befindet sich die zugehörige Förderwelle 11 mit der daran befestigten Förderschnecke 13. Die Förderschnecke 13 wird über eine Antriebseinheit, einen Motor 15, der im gezeigten Ausführungsbeispiel auf der linken Stirnseite der Trockenmörtel-Mischanlage angebaut ist über einen zugehörigen Wellenzapfen 17 angetrieben und gelagert.In the drawing, the dry mortar mixing plant is shown in longitudinal section in a schematic representation and comprises a conveying channel 1 and a downstream mixing channel 3. A vertical container or silo (not shown in more detail) for the dry mortar is connected via a vertical attachment flange 5. A releasable delivery pipe 9 is installed in the delivery channel 1 via two radial holding devices 7a and 7b arranged at an axial distance from one another. The associated conveyor shaft 11 with the conveyor screw 13 attached to it is axially symmetrical to the conveyor pipe 9. The conveyor screw 13 is driven by a drive unit, a motor 15, which in the exemplary embodiment shown is mounted on the left end face of the dry mortar mixing system via an associated shaft journal 17 and stored.

Am gegenüberliegenden Ende der Förderwelle 11 ist diese in einem Lager 19 geführt, das als Mittellager ausgebildet ist. Das Lager 19 umfaßt dabei ferner eine Verbindungsnabe 21, in das das stirnseitige Ende der Förderwelle 11 in eine entsprechende Bohrung 23 eingreift.At the opposite end of the conveyor shaft 11, this is guided in a bearing 19 which is designed as a central bearing. The bearing 19 further includes a connecting hub 21, in which the front end of the conveyor shaft 11 engages in a corresponding bore 23.

Vor dem das Lager 19 aufnehmende Stirnende 25 des Förderkanales 1 ist eine untenliegende Austrittsöffnung 27 für das Förder- und Mischgut vorgesehen, wobei die Austrittsöffnung 27 zwischen der Halte- und Zentriervorrichtung 7b und dem Stirnende 25 angeordnet ist.In front of the front end 25 of the conveying channel 1 receiving the bearing 19, an outlet opening 27 for the conveyed and mixed material is provided, the outlet opening 27 being arranged between the holding and centering device 7b and the front end 25.

In Axialrichtung zu dem Förderkanal ist in dem nachgeordneten Mischkanal 3 eine Mischwelle 29 eingebaut, die mehrere Transport- und Mischflügel 31 trägt. Über einen Wasserzuführstutzen 33 kann ferner noch in den Mischkanal 3 Wasser zugeführt werden. Die Mischwelle 29 wird an dem im Förderkanal 1 zugewandten Ende ebenfalls in der Verbindungsnabe 21 und am gegenüberliegenden Stirnende 35 in einem dort angeordneten Stirnlager 37 geführt. Über ein vor dem Stirnende 35 angebrachten Austrittskanal 39 wird das Mischgut nach unten abgegeben.A mixing shaft 29, which carries a plurality of transport and mixing blades 31, is installed in the downstream mixing channel 3 in the axial direction of the conveying channel. Water can also be fed into the mixing channel 3 via a water feed pipe 33. The mixing shaft 29 is also guided at the end facing the delivery channel 1 in the connecting hub 21 and at the opposite end 35 in a front bearing 37 arranged there. The material to be mixed is discharged downwards via an outlet channel 39 arranged in front of the end 35.

Nachfolgend wird auf die Funktionsweise der Trockenmörtel-Mischanlage eingegangen.The functioning of the dry mortar mixing system is discussed below.

Das Mischgut wird über den erwähnten und nicht näher gezeigten Silobehälter dem Förderkanal 1 über den Ansatzflansch 5 zugeführt. Über den Motor 5 wird die Förderwelle 11 in Rotation versetzt, so daß das Mischgut über Förderflügel 41 unterhalb des Ansatzflansches 5 in das Förderrohr 9 weitertransportiert wird. Durch die Rotation der Förderschnecke bei drehfest angeordnetem Förderrohr 9 wird das Mischgut weiter durch dieses hindurch transportiert und an seinem stirnseitigem Ende vor dem Lager 19 durch die untere Austrittsöffnung 27 in die nachfolgende Mischkammer bzw. den Mischkanal 3 abgegeben, wobei die untere Wand des Mischkanales 3 tiefer angeordnet ist als die entsprechende untere Wand des Förderrohres 9. Das Förderrohr 9 ist dabei axialsymmetrisch zu einem umgebenden Außenmantel 43 eingebaut, der gleichzeitig die Außenwandung des Mischkanales 3 darstellt.The mix is fed via the mentioned and not shown silo container to the delivery channel 1 via the attachment flange 5. The conveyor shaft 11 is set in rotation via the motor 5, so that the mix is conveyed further via conveyor vanes 41 below the attachment flange 5 into the conveyor tube 9. Due to the rotation of the screw conveyor with the delivery pipe 9 arranged in a rotationally fixed manner, the material to be mixed is transported further through it and is discharged at its front end in front of the bearing 19 through the lower outlet opening 27 into the subsequent mixing chamber or the mixing channel 3, the lower wall of the mixing channel 3 is arranged lower than the corresponding lower wall of the delivery pipe 9. The delivery pipe 9 is installed axially symmetrically to a surrounding outer jacket 43, which at the same time represents the outer wall of the mixing channel 3.

Der Förderkanal 1 mit der Förderwelle 11 stellt dabei eine Dosiervorrichtung zum gleichmäßigen Zuführen von Mischgut dar.The conveying channel 1 with the conveying shaft 11 represents a metering device for the uniform feeding of mixed material.

Die Mischwelle 29 wird über die Verbindungsnabe 21 gemeinsam mit der Förderschnecke angetrieben, wobei das Mischgut gegebenenfalls unter Hinzusetzung von Wasser über den Wasserzuflußstutzen 33 bis zum Stirnende 35 des Mischkanales 3 befördert und dann über den Austrittskanal 39 abgegeben wird.The mixing shaft 29 is driven via the connecting hub 21 together with the screw conveyor, the mix being conveyed, if appropriate with the addition of water, via the water inlet connection 33 to the front end 35 of the mixing channel 3 and then discharged via the outlet channel 39.

Da das Förderrohr 9 über die dem Mischkanal 3 zugewandt liegende Halteeinrichtung 7b in den Mischkanal 3 hineinragt und das Mischgut über die untere Austrittsöffnung 27 in diese Mischkammer abgegeben wird, sind zum Weitertransport des Fördergutes ferner Kurzflügel 31a vorgesehen, die an einem benachbarten, auf der Mischwelle 29 sitzenden Transport- und Mischflügel 31 angebaut sind und den in den Mischkanal 3 hineinragenden Teil des Förderrohres 9 umkreisen.Since the conveying pipe 9 projects into the mixing duct 3 via the holding device 7b facing the mixing duct 3 and the mix is discharged into this mixing chamber via the lower outlet opening 27, short blades 31a are also provided for the further transport of the conveyed material, which are connected to an adjacent one on the mixing shaft 29 seated transport and mixing vanes 31 are attached and encircle the part of the delivery pipe 9 which projects into the mixing channel 3.

Wie sich aus dem gezeigten Ausführungsbeispiel ergibt, ist die Förderwelle 11 und die Mischwelle 29 nicht nur jeweils an ihrem außenliegenden Stirnende, sondern zusätzlich noch gemeinsam an ihrem aufeinander zuliegenden Stirnende über ein gemeinsames Lager 19 sicher gehalten und geführt. Dadurch lassen sich die Schwingungen der gesamten Anordnung deutlich minimieren. Da somit das Förderrohr 9 auch keine Zentrierfunktion mehr für die Förderschnecke 13 und die Förderwelle 11 übernehmen muß, ist es möglich, daß die Außenkanten 45 der Förderschnecke 13 im Abstand 46 zur Innenseite des Förderrohres 9 enden. Dabei kann der Abstand mehr als 3 mm, vorzugsweise 4 bis 10 mm und bei Bedarf auch mehr betragen. Ein Verklemmen von Sandkörnern und der Körnungen insbesondere im sog. Trokkenaustrag zwischen der Außenkante 45 und der Innenseite des Förderrohres 9, wird dadurch sicher vermieden. Ferner wird hierdurch eine völlig gleichmäßige Dosierung des zuzuführenden Mischgutes gewährleistet, so daß die am Austritt 39 abgegebene Mischung immer gleiche Mischverhältnisse mit dem zugeführten Wasser aufweist.As can be seen from the exemplary embodiment shown, the conveying shaft 11 and the mixing shaft 29 are not only held and guided securely not only at their outer end, but also jointly at their mutually facing end via a common bearing 19. As a result, the vibrations of the entire arrangement can be significantly minimized. Since the conveyor tube 9 thus also no longer has to assume a centering function for the screw conveyor 13 and the conveyor shaft 11, it is possible for the outer edges 45 of the conveyor screw 13 to end at a distance 46 from the inside of the conveyor tube 9. The distance can be more than 3 mm, preferably 4 to 10 mm and, if necessary, more. A jamming of sand grains and the grains, in particular in the so-called dry discharge between the outer edge 45 and the inside of the conveyor tube 9, is thereby reliably avoided. Furthermore, this ensures a completely uniform metering of the mixture to be supplied, so that the mixture discharged at the outlet 39 always has the same mixing ratio with the water supplied.

Nachfolgend wird noch auf den leicht vorzunehmenden Aus- und Einbau der diversen Teile insbesondere zum Reinigen und für Reparaturarbeiten eingegangen.The following explains the easy removal and installation of the various parts, especially for cleaning and repair work.

Wie sich aus der Darstellung nicht näher ergibt, kann durch Öffnen eines Schnellverschlusses ähnlich einem Schnellverschluß 58-worauf noch eingegangen wird - an einem Flansch 49 am Mischkanal 3 eine Stirnabdeckplatte 51 mit dem Stirnlager 37 leicht gelöst werden. Danach kann die Mischwelle 29 problemlos in Axialrichtung herausgezogen werden. Dies wird auch dadurch ermöglicht, da radial wegstehende Mitnehmerachsen 55 an der Mischwelle 29, über die die Mischwelle 29 über die Verbindungsnabe 21 angetrieben wird, lediglich in einer stirnseitigen Radialnut 53 in der Verbindungsnabe 21 während des Betriebes der Mischanlage eingesteckt gehalten sind.As can not be seen from the illustration, by opening a quick-release fastener similar to a quick-release fastener 58 - which will be discussed in more detail - an end cover plate 51 with the end bearing 37 can be easily released on a flange 49 on the mixing channel 3. Then the mixing shaft 29 can be pulled out in the axial direction without any problems. This is also made possible because radially projecting driver axes 55 on the mixing shaft 29, via which the mixing shaft 29 is driven via the connecting hub 21, are only kept plugged into an end radial groove 53 in the connecting hub 21 during operation of the mixing system.

Nach entfernter Mischwelle läßt sich bei Bedarf auch das Förderrohr 9 leicht ausbauen, nachdem Schrauben 57 entfernt werden, über die ein am Außenumfang des Förderrohres 9 angeschweißter Zentrierflansch 59 mit der zweiten Halteeinrichtung 7b fest verbunden ist. Dabei endet die Halteeinrichtung 7b im Abstand vom Außenumfang des Förderrohres 9, so daß das Förderrohr 9 in Axialrichtung von der Mischkammer her durch diese Halteeinrichtung 7b leicht ein- bzw. ausgebaut werden kann. Die Zentrierung des Förderrohres 9 erfolgt dabei über den Zentrierflansch 59, der in einem entsprechend dimensionierten Ringfalz 61 der Halteeinrichtung 7b im eingebauten Zustand zu liegen kommt.After the mixing shaft has been removed, the feed pipe 9 can also be easily removed if necessary after screws 57 are removed, via which a centering flange 59 welded to the outer circumference of the feed pipe 9 is firmly connected to the second holding device 7b. The holding device 7b ends at a distance from the outer circumference of the delivery pipe 9, so that the delivery pipe 9 can be easily installed or removed in the axial direction from the mixing chamber by this holding device 7b. The delivery pipe 9 is centered via the centering flange 59, which comes to rest in an appropriately dimensioned annular fold 61 of the holding device 7b in the installed state.

Da das Förderrohr 9 über den Zentrierflansch 59 und die Schrauben 57 an dieser Halteeinrichtung 7b fest gehalten wird, ist die erste Halteeinrichtung 7b lediglich als an der Innenseite des Außenmantels 43 angeschweißter Rohrstutzen 63 zur weiteren Zentrierung ausgebildet.Since the delivery pipe 9 is held firmly on this holding device 7b via the centering flange 59 and the screws 57, the first holding device 7b is merely designed as a pipe socket 63 welded to the inside of the outer jacket 43 for further centering.

Der Zusammenbau der einzelnen Teile erfolgt dabei im umgekehrter Reihenfolge genauso einfach ohne große Probleme.The assembly of the individual parts is carried out in the reverse order just as easily without major problems.

Wie bereits erwähnt wurde ist die Verbindungsnabe 21 stirnseitig jeweils mit zumindest einer Radialnut 53 versehen, in die entsprechende Mitnehmer 55 der Mischwelle 29 bzw. der Förderwelle 11 durch axiales Ineinanderschieben eingesteckt werden. Hierdurch wird die gemeinsame Rotation von der Antriebseinheit 15 bis zur Mischwelle 29 gewährleistet. Da aber ferner das Förderrohr 9 an dem dem Motor 15 zugewandten Ende ebenfalls in einem Wellenzapfen 17 axial im wesentlichen nicht verschiebbar gehalten ist und die Mischwelle 29 an ihrem gegenüberliegenden Stirnende 35 ebenfalls in nicht näher gezeigter Weise gegen axiales Verschieben gesichert ist, bedarf es keiner weiteren technischen Maßnahmen, um zu verhindern, daß die Verbindungsnabe 21 nicht axial verrückt wird, da diese durch die eingesteckten Mitnehmer 55 an der Förder- und Mischwelle automatisch und selbsttätig zentriert wird.As has already been mentioned, the connecting hub 21 is provided on the end face with at least one radial groove 53, into which corresponding drivers 55 of the mixing shaft 29 or the conveying shaft 11 are inserted by being pushed axially into one another. This ensures the common rotation from the drive unit 15 to the mixing shaft 29. However, since the delivery pipe 9 at the end facing the motor 15 is likewise axially essentially non-displaceable in a shaft journal 17 and the mixing shaft 29 is also secured against axial displacement at its opposite end 35 in a manner not shown, no further is required technical measures to prevent that the connecting hub 21 is not axially displaced, since this is automatically and automatically centered by the inserted driver 55 on the conveyor and mixing shaft.

Abschließend sei noch angemerkt, daß der Außenmantel- wie in der Figur gezeigt - auch zweigeteilt sein kann, wobei sich eine Zweiteilung im Bereich der Halteeinrichtung 7b anbietet. Durch Lösen eines Schnellverschlusses 58 läßt sich bei bereits ausgebauter Mischwelle 29 dann der Außenmantel im Bereich der Mischwelle um ein unteres Verschwenklager 59 absenken.In conclusion, it should also be noted that the outer jacket - as shown in the figure - can also be divided into two, with a split in the area of the holding device 7b offering itself. By loosening a quick-release fastener 58, with the mixing shaft 29 already removed, the outer jacket can then be lowered in the area of the mixing shaft by a lower pivot bearing 59.

Claims (12)

1. Dry mortar mixing plant with a substantially horizontal conveying duct and a mixing duct (1, 3) axially adjacent thereto, a non-rotatably installed conveying tube (9), in which the mix material which can be supplied via a supply nozzle can be conveyed by means of a conveying shaft (11) which is actuated by a driving arrangement (15) and provided with a conveying screw (13), and with a mixing shaft (29) which is rotatably arranged in the mixing duct (3), is provided with conveying mixing blades (31), rotates together with the conveying shaft (11) and is coupled thereto, and with an outlet opening for the mix material arranged at the end of the mixing duct (3) remote from the supply nozzle, characterised in that a central bearing (19) for the conveying shaft (11) and the mixing shaft (29) is provided at the front end of the conveying tube (9), as viewed in the conveying direction, and in that an outlet opening (27) for the mix material is made below, at the end of the conveying tube (9), before the bearing (19), the bottom wall of the following mixing duct (3) being arranged lower than the bottom wall of the conveying tube (9).
2. Dry mortar mixing plant according to Claim 1, characterised in that the distance (46) between the outer edges (45) of the conveying screw (13) and the surrounding conveying tube (9) is greater than 3 mm, preferably 4 to 10 mm or more.
3. Dry mortar mixing plant according to Claim 1 or 2, wherein the mixing shaft is installed in an axial extension to the conveying shaft, characterised in that the central bearing (19) is constructed as a common bearing for the face ends of the conveying shaft (11) and of the mixing shaft (29) pointing towards one another.
4. Dry mortar mixing plant according to Claim 3, characterised in that a connecting hub (21) which produces the connection between the conveying shaft (11) and the mixing shaft (29) is installed in the central bearing (19).
5. Dry mortar mixing plant according to one of Claims 1 to 4, characterised in that a common outer casing (43), in which the conveying tube (9) is axially extractably held, is provided for the conveying duct (1) and the subsequent mixing duct (3).
6. Dry mortar mixing plant according to Claim 5, characterised in that the conveying tube (9) is held centrally at least in two axially mutually spaced, radially inwardly pointing holding devices (7a, 7b) fixed on the outer casing (43), the holding device (7b) facing the outlet opening (27) lying before the outlet opening (27) when viewed in the conveying direction.
7. Dry mortar mixing plant according to one of Claims 1 to 6, characterised in that the conveying tube (9) is provided, in the region of the holding device (7b) facing the central bearing (19), with a centering flange (59) which engages in a corresponding annular groove (61) in the holding device (7b), this holding device (7b) ending before the outer casing of the conveying tube (9) without contact with the conveying tube.
8. Dry mortar mixing plant according to one of Claims 1 to 7, characterised in that the face end of the conveying tube (9) receiving the central bearing (19) penetrates into the mixing duct (3).
9. Dry mortar mixing plant according to one of Claims 1 to 8, characterised in that the connecting hub (21) is held centrally in the bearing (19) by the face ends of the conveying and mixing shaft (11,
29) which face one another and the coupling device thereof (carrier 55, radial grooves 53).
10. Dry mortar mixing plant according to one of Claims 1 to 9, characterised in that the outer casing (43) is formed in two parts, the point of separation being located in the region of the central bearing (19) and preferably in the region of the second holding device (7b).
11. Dry mortar mixing plant according to Claim 10, characterised in that a pivot bearing (59) is provided at the end-face connecting point between the two-part outer casing (43), and a closure device (quick-action closure device (57)) is preferably provided diametrically opposite thereto.
EP84114191A 1983-12-23 1984-11-23 Dry cement mixing installation Expired EP0147631B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84114191T ATE45539T1 (en) 1983-12-23 1984-11-23 DRY MORTAR MIXING PLANT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3346823 1983-12-23
DE19833346823 DE3346823A1 (en) 1983-12-23 1983-12-23 DRY MORTAR MIXING PLANT

Publications (3)

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EP0147631A2 EP0147631A2 (en) 1985-07-10
EP0147631A3 EP0147631A3 (en) 1987-05-20
EP0147631B1 true EP0147631B1 (en) 1989-08-16

Family

ID=6217958

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84114191A Expired EP0147631B1 (en) 1983-12-23 1984-11-23 Dry cement mixing installation

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EP (1) EP0147631B1 (en)
AT (1) ATE45539T1 (en)
DE (2) DE3346823A1 (en)

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Also Published As

Publication number Publication date
DE3479410D1 (en) 1989-09-21
EP0147631A2 (en) 1985-07-10
DE3346823A1 (en) 1985-07-11
ATE45539T1 (en) 1989-09-15
EP0147631A3 (en) 1987-05-20

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