EP3675992B1 - Construction material mixer - Google Patents

Construction material mixer Download PDF

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Publication number
EP3675992B1
EP3675992B1 EP17798163.6A EP17798163A EP3675992B1 EP 3675992 B1 EP3675992 B1 EP 3675992B1 EP 17798163 A EP17798163 A EP 17798163A EP 3675992 B1 EP3675992 B1 EP 3675992B1
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EP
European Patent Office
Prior art keywords
construction material
material mixer
latching
mixer according
blades
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.)
Active
Application number
EP17798163.6A
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German (de)
French (fr)
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EP3675992A1 (en
Inventor
Ingolf DETLOFF
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.)
Ammann Schweiz AG
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Ammann Schweiz AG
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Publication of EP3675992A1 publication Critical patent/EP3675992A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/071—Fixing of the stirrer to the shaft
    • 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
    • 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
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0726—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis having stirring elements connected to the stirrer shaft each by a single radial rod, other than open frameworks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1125—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis
    • B01F27/11253—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis the blades extending oblique to the stirrer axis
    • 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
    • B01F35/40—Mounting or supporting mixing devices or receptacles; Clamping or holding arrangements therefor
    • B01F35/41—Mounting or supporting stirrer shafts or stirrer units on receptacles
    • B01F35/412—Mounting or supporting stirrer shafts or stirrer units on receptacles by supporting both extremities of the shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/28—Mixing cement, mortar, clay, plaster or concrete ingredients
    • 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
    • B01F27/052—Stirrers with replaceable wearing elements; Wearing elements therefor
    • 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
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms 
    • 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
    • B28C5/0806—Details; Accessories

Definitions

  • the invention relates to a building material mixer, in particular asphalt or concrete mixer, according to the preamble of claim 1, a mixer arm according to the preamble of claim 11, and a corresponding method for replacing blades in concrete mixers.
  • Building material mixers usually consist of a container with at least one driven shaft on which mixing arms carrying blades perpendicular to the shaft are attached at a distance from one another.
  • the blades are arranged at a distance from the inner wall of the container.
  • the mixing arms have an inner part connected to the shaft and an outer part carrying the blades. These two parts can be connected to one another by means of an adjustable connecting device having screws.
  • the actual operational connection between the outer parts and the inner parts is established by means of a large number of screw connections, to be precise on site when the worn blades have to be replaced.
  • the pamphlet US4877327 discloses a building material mixer according to the preamble of claim 1 and a mixing arm according to the preamble of claim 11.
  • the invention is based on the object of providing a remedy here and developing the mixer of the generic type without undue structural effort in such a way that the blades can be exchanged in a minimum of time.
  • the invention is implemented in any case when the operational connection between the inner part and the outer part of a mixing arm in building material mixers is established by means of a snap-in and / or snap-in connection. This makes it possible to mount new blades without the use of tools.
  • the latching connection device consists on the one hand of two pins provided with latching openings, which run concurrently with the mixing arm are arranged at the front end of the inner part at a distance of the diameter of a bolt carrying the blade.
  • the locking connection device comprises two centrally perforated molded parts enclosing the pegs, one of which is provided with two spring tabs that can be fitted into the locking openings of the pegs, as well as a bolt carrying the blade, which enables an operational connection between the molded parts.
  • the individual parts are connected to the shovel via the bolts in order to then establish an operational connection between the outer part and the inner part, which has the pegs.
  • the assembly of the outer part is made in the factory, while the building material mixer is equipped with new blades on site.
  • the individual part not provided with the spring tabs is designed as a cage that receives the latching lugs. Tilting of the blade can thus be counteracted.
  • the distances between the blades and the inner wall of the container can also be adjusted in a simple manner by arranging spacers of different thicknesses at the joint between the outer part and the inner part.
  • the invention also relates to a method according to claim 12 for carrying out the replacement of blades of a building material mixer.
  • the protective cover is removed from the sleeve, the connection is released and the blade to be replaced is removed.
  • the prefabricated locking connection device with the new shovel is attached to the pin.
  • the locking connection device can be released particularly quickly and the old shovel can be removed.
  • the figures show a building material mixer with a cylindrical container 1 with a driven central shaft 5, on which mixing arms 6 carrying blades 12 perpendicular to the shaft are fastened at intervals.
  • the axes of the mixing arms can enclose a different angle with the axis of the shaft 5.
  • the blades 12 are at a distance from the inner wall of the container 1.
  • the mixing arms 6 are divided into an inner part 11 connected to the shaft 5 and an outer part 13 carrying the blade 12. Both parts can be connected to one another by means of an adjustable connecting device 14.
  • the connecting device is generally designed in such a way that the actual operational connection between the two parts, that is to say the inner part and the outer part, is established by plugging, latching and / or twisting. The advantage of these connections is that they can be produced without tools, which is of particular importance when a large number of blades are exchanged.
  • a building material mixer is shown. It consists of a cylindrical container 1 which is closed with a lid 2.
  • a shaft 5 is mounted centrally in the container 1 by means of bearings 3, 4, to which the mixing arms are attached. Just a mixing arm 6 is shown in detail, others 7-10 are only indicated.
  • the shaft 5 usually carries a plurality of mixing arms with blades which protrude from the shaft 5, preferably at right angles.
  • the shaft 5 is set in rotation by a drive 15, for example an electric motor.
  • the mixing arm 6 comprises an inner part 11 connected to the shaft 5 and an outer part 13 carrying a shovel 12, both parts being releasably connectable to one another by means of an adjustable connecting device 14.
  • the mixing arm 6 is in the Figures 2-4 shown in more detail.
  • the inner part 11 is after Fig. 2 from a mixing arm foot 16 connected to the shaft, for example by means of a screw connection, and a molded part protruding from this, from whose foot-free end face 17 two pins 18, 19 Figures 3 and 4th ) protrude at the same time as the molded part.
  • These pins have locking recesses or locking openings 20, 21 and thus form part of a locking device 22 ( Fig. 4 ).
  • a second part of the latching device 22 is formed by two centrally perforated molded parts 23, 24.
  • the molded part 23 is provided with two spring tabs 25, 26 arranged to the side of the perforation 23a, which can be introduced into the latching depressions 20, 21.
  • the molded part 24 is supplemented to form a cage which serves to receive the two pins 18 and 19 and to protect them from working material.
  • a bolt 27 is guided through the perforations 23a and 24a of the molded parts 23, 24, at one end of which a blade 12 is fastened over a square piece 28 and which is provided with a threaded section 29 at the other end.
  • This threaded section 29 is in the operating state of the outer part 13 ( Fig. 1 ) provided with a nut 31, which in turn can be covered by a sleeve 30 with a protective cover 32.
  • the sleeve 30 can be closed with the protective cover 32 arranged at the end in order to protect the screw connection against working material. It is essentially a can-lid connection that is simple is solvable.
  • the square piece 28, in conjunction with the bevels of the molded part 23, serves to prevent the blade 12 from twisting.
  • the unit consisting of the parts 12, 28, 27, 29, 23, 24, 30, 31, 32 is preassembled when the blade is replaced, the nut 31 of the screw connection being firmly tightened.
  • This screw connection is only used to hold the unit described above together, but not to produce a screw connection between the outer part 13 or the shovel 12 and the inner part (arm) 11, as in the conventional building material mixers, in which the actual connection between the arm and the Blade is made by means of a screw connection, which must be loosened when replacing the blade, with a special tool.
  • the construction of the mixing arm is such that, instead of using a conventional cutting torch or cut-off machine, the protective cover 32 can be removed in the shortest possible time, the nut 31, which holds the unit together, can be loosened and the used blade can be removed from the locking connection device 22.
  • the new unit can then just as quickly be plugged onto the pins 18, 19, the spring tabs 25, 26 locking into the locking openings 20, 21.
  • the distance between the blade edge and the inner wall of the container 1 can be adjusted by means of spacers 23b that are slipped over the pins 18, 19.

Description

Die Erfindung betrifft einen Baustoffmischer, insbesondere Asphalt- oder Betonmischer, nach dem Oberbegriff des Anspruchs 1, einen Mischarm nach dem Oberbegriff des Anspruchs 11, sowie ein entsprechendes Verfahren zur Durchführung des Ersatzes von Schaufeln bei Betonmischern.The invention relates to a building material mixer, in particular asphalt or concrete mixer, according to the preamble of claim 1, a mixer arm according to the preamble of claim 11, and a corresponding method for replacing blades in concrete mixers.

Baustoffmischer bestehen in der Regel aus einem Behälter mit mindestens einer angetriebenen Welle, an der senkrecht zur Welle Schaufeln tragende Mischarme in Abständen zueinander befestigt sind. Dabei sind die Schaufeln mit Abstand von der Innenwand des Behälters angeordnet. Die Mischarme weisen ein mit der Welle verbundenes Innenteil sowie ein die Schaufeln tragendes Außenteil auf. Diese beiden Teile sind mittels einer einstellbaren, Schrauben aufweisenden Verbindungsvorrichtung miteinander verbindbar. Die eigentliche betriebsgemäße Verbindung zwischen den Außenteilen und den Innenteilen wird mittels einer Vielzahl von Schraubverbindungen hergestellt, und zwar vor Ort, wenn die verschlissenen Schaufeln ausgewechselt werden müssen.Building material mixers usually consist of a container with at least one driven shaft on which mixing arms carrying blades perpendicular to the shaft are attached at a distance from one another. The blades are arranged at a distance from the inner wall of the container. The mixing arms have an inner part connected to the shaft and an outer part carrying the blades. These two parts can be connected to one another by means of an adjustable connecting device having screws. The actual operational connection between the outer parts and the inner parts is established by means of a large number of screw connections, to be precise on site when the worn blades have to be replaced.

Bei bekannten Baustoffmischern, wie sie z. B. in den nachstehenden Druckschriften beschrieben sind ( WO2006/007778A1 , EP0111148A2 , EP2007275700 , US3738774 , US5061082 , DE9410951U1 , US3773436 , US3773436A , CH408743A ), ist der Austausch der verschlissenen Schaufeln mit einem erheblichen Zeitaufwand verbunden, da alle Schraubverbindungen der Mischarme - ein Baustoffmischer weist in der Regel eine Vielzahl von Mischarmen auf - zumindest einmal betätigt werden müssen. Sind die Teile zudem verschlissen, verklebt durch anhaftendes Mischgut oder miteinander verschweißt, müssen zusätzliche Maßnahmen (beispielsweise Schneidbrenner oder Trennschleifer) getroffen werden, um den Baustoffmischer mit neuen Schaufeln zu bestücken.In known building material mixers, as they are, for. B. are described in the following publications ( WO2006 / 007778A1 , EP0111148A2 , EP2007275700 , US3738774 , US5061082 , DE9410951U1 , US3773436 , US3773436A , CH408743A ), the replacement of the worn blades is associated with a considerable expenditure of time, since all screw connections of the mixing arms - a building material mixer usually has a large number of mixing arms - must be actuated at least once. If the parts are also worn, stuck together by adhering mix or welded together, additional measures (e.g. cutting torch or cut-off grinder) must be taken to equip the building material mixer with new blades.

Die Druckschrift US4877327 offenbart einen Baustoffmischer entsprechend dem Oberbegriff des Anspruchs 1 und einen Mischarm entsprechend dem Oberbegriff des Anspruchs 11.The pamphlet US4877327 discloses a building material mixer according to the preamble of claim 1 and a mixing arm according to the preamble of claim 11.

Ausgehend von dem obigen Stand der Technik liegt der Erfindung die Aufgabe zu Grunde, hier Abhilfe zu schaffen und den gattungsgemäßen Mischer ohne unangemessenen konstruktiven Aufwand so weiterzubilden, dass der Austausch der Schaufeln mit minimalem Zeitaufwand erfolgen kann.Proceeding from the above prior art, the invention is based on the object of providing a remedy here and developing the mixer of the generic type without undue structural effort in such a way that the blades can be exchanged in a minimum of time.

Die gestellte Aufgabe wird durch die Merkmale des Anspruchs 1 bzw. des Anspruchs 11 gelöst.The stated object is achieved by the features of claim 1 and claim 11, respectively.

Man erkennt, dass die Erfindung jedenfalls dann verwirklicht ist, wenn die betriebsgemäße Verbindung zwischen dem Innenteil sowie dem Außenteil eines Mischarms bei Baustoffmischern durch Einrast- und/oder Schnappverbindung hergestellt wird. Dadurch ist es möglich, neue Schaufeln ohne Einsatz von Werkzeugen zu montieren.It can be seen that the invention is implemented in any case when the operational connection between the inner part and the outer part of a mixing arm in building material mixers is established by means of a snap-in and / or snap-in connection. This makes it possible to mount new blades without the use of tools.

Weitere zweckmäßige und vorteilhafte Maßnahmen der Erfindung gehen aus den Unteransprüchen hervor.Further useful and advantageous measures of the invention emerge from the subclaims.

Gemäß einer weiteren Ausbildung der Erfindung besteht die Rastverbindungsvorrichtung einerseits aus zwei mit Rastöffnungen versehenen Zapfen, die gleichlaufend mit dem Mischarm am Stirnende des Innenteils im Abstand des Durchmessers einer die Schaufel tragenden Bolzen angeordnet sind. Andererseits umfasst die Rastverbindungsvorrichtung zwei die Zapfen einfassende zentral gelochte Formteile, von denen die eine mit zwei in Rastöffnungen der Zapfen einpassbaren Federlaschen versehen ist, sowie einen die Schaufel tragenden Bolzen, der eine betriebsgemäße Verbindung zwischen den Formteilen ermöglicht. Durch diese Verbindung werden die Einzelteile über die Bolzen mit der Schaufel verbunden, um sodann eine betriebsgemäße Verbindung des Außenteils mit dem Innenteil, der die Zapfen aufweist, herzustellen. Der Zusammenbau des Außenteils wird fabrikmäßig hergestellt, während die Bestückung des Baustoffmischers mit neuen Schaufeln vor Ort erfolgt.According to a further embodiment of the invention, the latching connection device consists on the one hand of two pins provided with latching openings, which run concurrently with the mixing arm are arranged at the front end of the inner part at a distance of the diameter of a bolt carrying the blade. On the other hand, the locking connection device comprises two centrally perforated molded parts enclosing the pegs, one of which is provided with two spring tabs that can be fitted into the locking openings of the pegs, as well as a bolt carrying the blade, which enables an operational connection between the molded parts. Through this connection, the individual parts are connected to the shovel via the bolts in order to then establish an operational connection between the outer part and the inner part, which has the pegs. The assembly of the outer part is made in the factory, while the building material mixer is equipped with new blades on site.

Gemäß einer weiteren Ausbildung der Erfindung ist das nicht mit den Federlaschen versehene Einzelteil als die Rastnasen aufnehmender Käfig ausgebildet. Damit kann einem Verkanten der Schaufel entgegengewirkt werden.According to a further embodiment of the invention, the individual part not provided with the spring tabs is designed as a cage that receives the latching lugs. Tilting of the blade can thus be counteracted.

Mit der Ausbildung des Baustoffmischers gemäß der Erfindung lassen sich auch auf einfache Weise die Abstände der Schaufeln zur Behälterinnenwand einstellen, indem an der Stoßstelle zwischen dem Außenteil und dem Innenteil Distanzkörper unterschiedlicher Dicke angeordnet werden.With the construction of the building material mixer according to the invention, the distances between the blades and the inner wall of the container can also be adjusted in a simple manner by arranging spacers of different thicknesses at the joint between the outer part and the inner part.

Die Erfindung betrifft auch ein Verfahren entsprechend Anspruch 12 zur Durchführung des Ersatzes von Schaufeln eines Baustoffmischers. Dazu wird der Schutzdeckel von der Hülse entfernt, die Verbindung gelöst und die zu ersetzende Schaufel entfernt. Danach wird die vorgefertigte Rastverbindungsvorrichtung mit der neuen Schaufel auf die Zapfen aufgesteckt. Dadurch lassen sich die Rastverbindungsvorrichtung besonders schnell lösen und die alte Schaufel entfernen.The invention also relates to a method according to claim 12 for carrying out the replacement of blades of a building material mixer. To do this, the protective cover is removed from the sleeve, the connection is released and the blade to be replaced is removed. Then the prefabricated locking connection device with the new shovel is attached to the pin. As a result, the locking connection device can be released particularly quickly and the old shovel can be removed.

Die Erfindung wird nun anhand von Ausführungsbeispielen näher erläutert. Es zeigen:

Fig. 1
einen Schnitt durch einen Baustoffmischer mit einem ausgeführten Mischarm und weiteren angedeuteten Mischarmen,
Fig. 2
eine perspektivische Ansicht eines Mischarms (Innenteil) und eine seitliche Explosionsdarstellung eines Außenteils (Schaufel und Rastvorrichtung),
Fig. 3
eine perspektivische Ansicht der Fig. 2 von seitlich vorn und
Fig. 4
eine perspektivische Ansicht der Fig. 2 von seitlich hinten.
The invention will now be explained in more detail on the basis of exemplary embodiments. Show it:
Fig. 1
a section through a building material mixer with an executed mixing arm and further indicated mixing arms,
Fig. 2
a perspective view of a mixing arm (inner part) and an exploded side view of an outer part (shovel and locking device),
Fig. 3
a perspective view of Fig. 2 from the side in front and
Fig. 4
a perspective view of Fig. 2 from the side behind.

Die Figuren zeigen einen Baustoffmischer mit einem zylindrischen Behälter 1 mit einer angetriebenen zentralen Welle 5, an der senkrecht zur Welle Schaufeln 12 tragende Mischarme 6 in Abständen befestigt sind. Allgemein können die Achsen der Mischarme mit der Achse der Welle 5 einen anderen Winkel einschließen. Die Schaufeln 12 weisen einen Abstand von der Innenwand des Behälters 1 auf. Die Mischarme 6 sind in ein mit der Welle 5 verbundenes Innenteil 11 und ein die Schaufel 12 tragendes Außenteil 13 aufgeteilt. Beide Teile sind mittels einer einstellbaren Verbindungsvorrichtung 14 miteinander verbindbar. Die Verbindungsvorrichtung ist allgemein so ausgebildet, dass die eigentliche betriebsgemäße Verbindung zwischen den beiden Teilen, also dem Innenteil und dem Außenteil, durch Stecken, Einrasten und/oder Verdrehen hergestellt wird. Der Vorteil dieser Verbindungen besteht darin, dass sie werkzeugfrei hergestellt werden können, was bei Austausch einer Vielzahl von Schaufeln von besonderer Bedeutung ist.The figures show a building material mixer with a cylindrical container 1 with a driven central shaft 5, on which mixing arms 6 carrying blades 12 perpendicular to the shaft are fastened at intervals. In general, the axes of the mixing arms can enclose a different angle with the axis of the shaft 5. The blades 12 are at a distance from the inner wall of the container 1. The mixing arms 6 are divided into an inner part 11 connected to the shaft 5 and an outer part 13 carrying the blade 12. Both parts can be connected to one another by means of an adjustable connecting device 14. The connecting device is generally designed in such a way that the actual operational connection between the two parts, that is to say the inner part and the outer part, is established by plugging, latching and / or twisting. The advantage of these connections is that they can be produced without tools, which is of particular importance when a large number of blades are exchanged.

In Fig. 1 ist ein Baustoffmischer gezeigt. Er besteht aus einem zylinderförmigen Behälter 1, der mit einem Deckel 2 abgeschlossen ist. Zentral im Behälter 1 ist mittels Lager 3, 4 eine Welle 5 gelagert, an der Mischarme befestigt sind. Nur ein Mischarm 6 ist ausführlich dargestellt, andere 7 - 10 sind nur angedeutet. Die Welle 5 trägt in der Regel eine Vielzahl von Mischarmen mit Schaufeln, die von der Welle 5 vorzugsweise rechtwinklig abstehen. Die Welle 5 wird durch einen Antrieb 15, beispielsweise einen Elektromotor, in Drehung versetzt.In Fig. 1 a building material mixer is shown. It consists of a cylindrical container 1 which is closed with a lid 2. A shaft 5 is mounted centrally in the container 1 by means of bearings 3, 4, to which the mixing arms are attached. Just a mixing arm 6 is shown in detail, others 7-10 are only indicated. The shaft 5 usually carries a plurality of mixing arms with blades which protrude from the shaft 5, preferably at right angles. The shaft 5 is set in rotation by a drive 15, for example an electric motor.

Der Mischarm 6 umfasst ein mit der Welle 5 verbundenes Innenteil 11 sowie ein eine Schaufel 12 tragendes Außenteil 13, wobei beide Teile mittels einer einstellbaren Verbindungsvorrichtung 14 miteinander lösbar verbindbar sind. Der Mischarm 6 ist in den Figuren 2 - 4 näher dargestellt.The mixing arm 6 comprises an inner part 11 connected to the shaft 5 and an outer part 13 carrying a shovel 12, both parts being releasably connectable to one another by means of an adjustable connecting device 14. The mixing arm 6 is in the Figures 2-4 shown in more detail.

Das Innenteil 11 besteht nach Fig. 2 aus einem mit der Welle beispielsweise mittels einer Schraubverbindung verbundenen Mischarmfuß 16 und einem aus diesem herausragenden Formteil, aus dessen fußfreier Stirnfläche 17 zwei Zapfen 18, 19 (Figuren 3 und 4) gleichlaufend mit dem Formteil herausragen. Diese Zapfen weisen Rastausnehmungen oder Rastöffnungen 20, 21 auf und bilden damit Teil einer Rastvorrichtung 22 (Fig. 4). Ein zweites Teil der Rastvorrichtung 22 wird durch zwei zentral gelochte Formteile 23, 24 gebildet. Das Formteil 23 ist mit zwei seitlich der Lochung 23a angeordneten Federlaschen 25, 26 versehen, die in die Rastvertiefungen 20, 21 einbringbar sind. Das Formteil 24 ist zu einem Käfig ergänzt, der dazu dient, die beiden Zapfen 18 und 19 aufzunehmen und vor Arbeitsmaterial zu schützen. Durch die Lochungen 23a und 24a der Formteile 23, 24 ist ein Bolzen 27 geführt, an dessen einem Ende eine Schaufel 12 über einem Vierkantstück 28 befestigt ist und der am anderen Ende mit einem Gewindeabschnitt 29 versehen ist. Dieser Gewindeabschnitt 29 ist im Betriebszustand des Außenteils 13 (Fig. 1) mit einer Mutter 31 versehen, die ihrerseits durch eine Hülse 30 mit Schutzdeckel 32 abdeckbar ist. Die Hülse 30 kann zum Schutz der Schraubverbindung gegen Arbeitsmaterial mit dem endseitig angeordneten Schutzdeckel 32 geschlossen werden. Es handelt sich dabei im Wesentlichen um eine Dosen-Deckel-Verbindung, die einfach lösbar ist. Das Vierkantstück 28 dient in Verbindung mit Abkantungen der Formteil 23 dazu, Verdrehungen der Schaufel 12 zu vermeiden.The inner part 11 is after Fig. 2 from a mixing arm foot 16 connected to the shaft, for example by means of a screw connection, and a molded part protruding from this, from whose foot-free end face 17 two pins 18, 19 Figures 3 and 4th ) protrude at the same time as the molded part. These pins have locking recesses or locking openings 20, 21 and thus form part of a locking device 22 ( Fig. 4 ). A second part of the latching device 22 is formed by two centrally perforated molded parts 23, 24. The molded part 23 is provided with two spring tabs 25, 26 arranged to the side of the perforation 23a, which can be introduced into the latching depressions 20, 21. The molded part 24 is supplemented to form a cage which serves to receive the two pins 18 and 19 and to protect them from working material. A bolt 27 is guided through the perforations 23a and 24a of the molded parts 23, 24, at one end of which a blade 12 is fastened over a square piece 28 and which is provided with a threaded section 29 at the other end. This threaded section 29 is in the operating state of the outer part 13 ( Fig. 1 ) provided with a nut 31, which in turn can be covered by a sleeve 30 with a protective cover 32. The sleeve 30 can be closed with the protective cover 32 arranged at the end in order to protect the screw connection against working material. It is essentially a can-lid connection that is simple is solvable. The square piece 28, in conjunction with the bevels of the molded part 23, serves to prevent the blade 12 from twisting.

Die aus den Teilen 12, 28, 27, 29, 23, 24, 30, 31, 32 bestehende Einheit ist bei einem Ersatz der Schaufel vormontiert, wobei die Mutter 31 der Schraubverbindung fest angezogen ist. Diese Schraubverbindung dient lediglich zum Zusammenhalt der oben bezeichneten Einheit, jedoch nicht zur Herstellung einer Schraubverbindung zwischen dem Außenteil 13 bzw. der Schaufel 12 und dem Innenteil (Arm) 11, wie bei den herkömmlichen Baustoffmischern, bei denen die eigentliche Verbindung zwischen dem Arm und der Schaufel mittels einer Schraubverbindung hergestellt wird, die beim Austausch der Schaufel gelöst werden muss, und zwar mit einem speziellen Werkzeug.The unit consisting of the parts 12, 28, 27, 29, 23, 24, 30, 31, 32 is preassembled when the blade is replaced, the nut 31 of the screw connection being firmly tightened. This screw connection is only used to hold the unit described above together, but not to produce a screw connection between the outer part 13 or the shovel 12 and the inner part (arm) 11, as in the conventional building material mixers, in which the actual connection between the arm and the Blade is made by means of a screw connection, which must be loosened when replacing the blade, with a special tool.

Der Aufbau des Mischarms ist damit derart getroffen, dass man anstelle der Verwendung eines üblichen Schneidbrenners oder Trennschleifers in kürzester Zeit den Schutzdeckel 32 entfernt, die Mutter 31, welche die Einheit zusammenhält, löst und die verbrauchte Schaufel aus der Rastverbindungsvorrichtung 22 entfernen kann. Die neue Einheit kann dann ebenso schnell auf die Zapfen 18, 19 aufgesteckt werden, wobei die Federlaschen 25, 26 in die Rastöffnungen 20, 21 einrasten. Dabei kann der Abstand der Schaufelkante von der Innenwand des Behälters 1 durch über die Zapfen 18, 19 übergestülpte Distanzkörper 23b eingestellt werden.The construction of the mixing arm is such that, instead of using a conventional cutting torch or cut-off machine, the protective cover 32 can be removed in the shortest possible time, the nut 31, which holds the unit together, can be loosened and the used blade can be removed from the locking connection device 22. The new unit can then just as quickly be plugged onto the pins 18, 19, the spring tabs 25, 26 locking into the locking openings 20, 21. The distance between the blade edge and the inner wall of the container 1 can be adjusted by means of spacers 23b that are slipped over the pins 18, 19.

Claims (12)

  1. Construction material mixer, comprising a container (1) having at least one driven shaft (5) to which blades (12) carrying mixing arms (6) are fastened at intervals, wherein the mixing arms (6) comprise an inner part (11), which is connected to the shaft (5), and an outer part (13), which carries the blades (12), which parts are connectable with each other without tools,
    characterized in that the mixing arms comprise a latching and/or snap-action connection (22) so that the inner part (11) is connectable with the outer part (13) by means of the latching and/or snap-action connection (22).
  2. Construction material mixer according to claim 1, characterized in that the mixing arms (6) which are fastened to the shaft (5) are detachably connectable with the shaft and are arranged perpendicularly to the shaft.
  3. Construction material mixer according to claim 1 or 2, characterized in that the latching and/or snap-in connection comprises a latching connection device (22) having at least one trunnion (18, 19) provided with latching openings (20, 21) and spring shackles (25, 26) working together with the latching openings (20, 21) in the operational state.
  4. Construction material mixer according to claim 3, characterized in that the trunnions (18, 19) are arranged at the front end of the inner part (11) parallel to the mixing arm (6) and at a distance of at least the diameter of bolts (27) carrying the blade (12).
  5. Construction material mixer according to claim 3 or 4, characterized by formed components (23, 24) which are perforated and can be assembled to form a hollow body, one of which comprises spring shackles (25, 26) working together with latching openings (20, 21) of the trunnions (18, 19), and which are traversed by the bolt (27) carrying the blade (12).
  6. Construction material mixer according to claim 5, characterized in that the formed components (23, 24) in the operational state form a cage receiving the trunnions (18, 19).
  7. Construction material mixer according to claim 6, characterized in that the bolt (27) carrying the blades (12) runs perpendicularly to the axle and is connected with the cage in a friction-locked manner.
  8. Construction material mixer according to claim 7, characterized in that the free end of the bolt (27) is provided with a clamping body (31), e.g. eccentric or nut, which is suitable to connect the parts of the cage in a friction-locked manner.
  9. Construction material mixer according to claim 8, characterized in that the clamping body (31) can be covered with a hollow body (30) in a manner devoid of material.
  10. Construction material mixer according to claim 9, characterized in that the hollow body (30) is embodied in the manner of a can with cover (32).
  11. Mixing arm carrying blades, for a construction material mixer according to one of the claims 1 to 10, wherein the mixing arm (6) is connectable without tools to a shaft (5) of the construction material mixer at an inner part (11) of the mixing arm and is supported at an outer part (13) of the mixing arm the blade,
    characterized in that the mixing arm comprises a latching and/or snap-action connection (22) so that the inner part (11) and the outer part (13) are operationally connectable with each other by means of the latching and/or snap-action connection (22).
  12. Method for conducting the replacement of blades of construction material mixers according to claim 8, wherein the friction-locked connection between the clamping body (31) and the bolt (27) is released, thereafter the outer part (13) with the worn out blade (12) is removed and finally a new outer part (13) with a blade (12) is plugged on the inner part (11).
EP17798163.6A 2017-11-02 2017-11-02 Construction material mixer Active EP3675992B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/078089 WO2019086116A1 (en) 2017-11-02 2017-11-02 Construction material mixer

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Publication Number Publication Date
EP3675992A1 EP3675992A1 (en) 2020-07-08
EP3675992B1 true EP3675992B1 (en) 2021-05-12

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US (1) US20200254402A1 (en)
EP (1) EP3675992B1 (en)
CN (1) CN111315471A (en)
ES (1) ES2878076T3 (en)
WO (1) WO2019086116A1 (en)

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Publication number Publication date
WO2019086116A1 (en) 2019-05-09
US20200254402A1 (en) 2020-08-13
CN111315471A (en) 2020-06-19
ES2878076T3 (en) 2021-11-18
EP3675992A1 (en) 2020-07-08

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