EP0367948B1 - Mixing device - Google Patents

Mixing device Download PDF

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Publication number
EP0367948B1
EP0367948B1 EP89116941A EP89116941A EP0367948B1 EP 0367948 B1 EP0367948 B1 EP 0367948B1 EP 89116941 A EP89116941 A EP 89116941A EP 89116941 A EP89116941 A EP 89116941A EP 0367948 B1 EP0367948 B1 EP 0367948B1
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EP
European Patent Office
Prior art keywords
mixing
vessel
extraction
mixing device
valve body
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
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EP89116941A
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German (de)
French (fr)
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EP0367948A1 (en
Inventor
Michael Derksen
Joachim Domke
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.)
Dr Herfeld GmbH and Co KG
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Dr Herfeld GmbH and Co KG
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Publication of EP0367948A1 publication Critical patent/EP0367948A1/en
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    • 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
    • B01F27/808—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers driven from the bottom of the receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/35—Mixing after turning the mixing vessel upside down
    • 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
    • B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
    • B01F35/32—Driving arrangements
    • B01F35/321—Disposition of the drive
    • B01F35/3213—Disposition of the drive at the lower side of the axis, e.g. driving the stirrer from the bottom of a receptacle

Definitions

  • the invention relates to a mixing device according to the preamble of claim 1.
  • Mixing devices of the type required in the preamble of claim 1 are known, for example, from DE-C-2 110 047 and EP-A-168 564.
  • the invention is therefore based on the object of designing a mixing device according to the preamble of claim 1 in such a way that disruptive dust formation when the mixing container is opened is avoided.
  • a suction device with a valve body is thus provided on the second container part, through which a suction opening provided in a wall of the second container part can be optionally blocked or released.
  • An expedient embodiment of the invention provides for protective gas to be introduced into the mixing container in order to carry out the mixing process under explosion protection conditions.
  • the suction device according to the invention allows the oxygen atmosphere to be drawn off when the mixing container is filled with the protective gas and, after the mixing process has ended, the protective gas to be removed.
  • the mixing device shown in FIGS. 1 and 2 as the first exemplary embodiment of the invention contains a mixing container which consists of two bowl-shaped container parts 1 and 2, which with the aid of clamping devices 3 at their open ends facing one another can be firmly connected.
  • the first container part 1 provided with a floor outlet 4 can be moved with the help of a driving pallet 5.
  • the second container part 2 contains mixing tools 6 inside, which are driven by a drive motor 7.
  • the second container part 2 is held stationary on a column-like stationary holder 8, specifically by means of a swivel shaft 8a with a horizontal swivel axis 9.
  • the swivel shaft 8a is driven by a swivel drive 10 consisting of a drive motor 10a and a slip-on gear 10b.
  • the second container part 2 can be pivoted about 180 ° about the horizontal pivot axis 9 by the pivot drive 10, namely between an initial position (FIG. 1) in which the second container part 2 forms the lid of the mixing container and a mixing position in which the second container part 2 forms the bottom of the mixing container.
  • a suction device 11 is fastened to the second container part 2, specifically to its bottom wall 2a located in the starting position. It contains a tubular, preferably cylindrical suction housing 12, which in the region of its - in the drawing - upper end 12a has a connecting piece 13 which can be connected to a suction line 15 by a pipe coupling 14 (preferably in the manner of a quick coupling).
  • This suction line 15 is part of a suction system with (not shown) filter and suction fan.
  • the end of the suction line 15 that can be connected to the connecting piece 13 may also be flexible in order to enable a quick coupling connection to the connecting piece 13.
  • the suction housing 12 is fastened to the bottom wall 2a, for example welded on. It projects with its lower end through an outer bottom wall part 2a 'and is connected to an inner bottom wall part 2ateil at a point at which a circular suction opening 16 is provided in the inner bottom wall part 2a' of the second container part 2.
  • the suction opening 16 is surrounded by an annular sealing seat 17 which widens in the direction of the suction device 11.
  • the suction device 11 contains a valve body 18 which is essentially in the form of a circular disk.
  • This valve body 18 fits exactly into the sealing seat 17 of the suction opening 16.
  • the valve body 18 has a sealing section 18a which tapers against the sealing seat 17.
  • a groove 19 is provided on the circumference of this sealing section 18a, into which a sealing ring 20 is inserted.
  • the valve body 18 can be moved axially back and forth between the closed position shown in FIG. 2 in solid lines and the open position 18 ′ shown in broken lines in the suction housing 12 (corresponding to the double arrow 21).
  • the valve body 18 closes the suction opening 16 flush with the inner wall of the inner bottom wall part 2a ⁇ .
  • the valve body 18 In the starting position of the mixing container, on the other hand, the valve body 18 can be brought into its open position 18 'and the suction opening 16 can thereby be opened.
  • the tubular suction housing 12 has a clear cross section which is larger than the cross section of the suction opening 16 and the diameter of the valve body 18.
  • the suction ring gap 22 between the circumference of the valve body 18 and the inner wall of the suction housing 12.
  • a pressure-medium-actuated cylinder-piston unit in the form of a compressed air cylinder 24 is provided in the illustrated embodiment, which is axially flanged to the upper end 12a of the suction housing 12 facing away from the suction opening 16 (flange connection 25).
  • the piston rod 24a of the compressed air cylinder 24 is fixedly connected to the end 26a of an actuating rod 26, the other end 26b of which supports the valve body 18.
  • the establishment and release of the coupling connection between the suction line 15 and the connecting piece 13 can be reported by limit switches of a control device belonging to the mixing device, so that the actuation of the valve body 18 by the compressed air cylinder 24 is controlled as a function of the actuation of these limit switches.
  • FIG 3 shows a further embodiment of the mixing device according to the invention, which makes it possible to carry out the mixing process under a protective gas atmosphere (for example under a nitrogen atmosphere) in order to meet explosion protection conditions in this way.
  • a protective gas atmosphere for example under a nitrogen atmosphere
  • FIG. 3 only illustrates the area which is delimited in FIG. 1 with dashed lines and identified by the reference symbol x.
  • FIG 3 shows the swivel shaft 8a, via which the slip-on gear 10b of the swivel drive 10 with the second container part 2 is rotatably connected.
  • This pivot shaft 8a is rotatably supported by bearings 27 in the fixed bracket 8.
  • the slip-on gear 10b is fixed on the bracket 8 by means of screws 28.
  • the pivot shaft 8a is designed as a hollow shaft.
  • a pipe 29 is arranged, which serves for the supply of protective gas and rotates with the pivot shaft 8a.
  • the outer end of the pipeline 29 is connected via a sealing head 30 to a stationary and rotationally fixed (not illustrated) protective gas supply line, a sealed rotary connection 31 being present between the sealing head 30 and the pipeline 29.
  • a valve 32 is arranged, the details of which are not illustrated in FIG.
  • This valve 32 opens under pressure (i.e. when protective gas under pressure is supplied via the pipeline 29). In the depressurized state, the valve closes and is preferably flush with the inner wall of the second container part 2.
  • a measuring point can be provided to which a residual oxygen measuring system is connected.
  • the first container part 1 filled with the product becomes moved under the second container part 2 and coupled with this via the pneumatic clamping devices 3. If the coupling connection is established (which is reported by the limit switch) and the lifting cylinders (which have raised the first container part 1 for establishing the coupling connection) are again in their lower position, protective gas (for example Nitrogen) supplied to the pipeline 29 and introduced into the mixing container via the valve 32.
  • protective gas for example Nitrogen
  • the feed pressure can be, for example, 1 to 2 bar.
  • the valve body 18 of the suction device 11 opens, so that the mixed atmosphere (oxygen / protective gas) which is formed in the mixing container is sucked off via the suction line 15.
  • the mixing container is suctioned off via the suction device 11 in the manner already explained.
  • the mixing container can then be opened.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Accessories For Mixers (AREA)
  • Glanulating (AREA)

Description

Die Erfindung betrifft eine Mischvorrichtung entsprechend dem Oberbegriff des Anspruches 1.The invention relates to a mixing device according to the preamble of claim 1.

Mischvorrichtungen der im Oberbegriff des Anspruches 1 vorausgesetzten Art sind beispielsweise durch die DE-C-2 110 047 und die EP-A-168 564 bekannt.Mixing devices of the type required in the preamble of claim 1 are known, for example, from DE-C-2 110 047 and EP-A-168 564.

Im Betrieb derartiger Mischvorrichtungen entsteht im Innern des Mischbehälters vielfach ein Überdruck, der beim Öffnen des Mischbehälters - je nach Art des Mischgutes - oft zu einer beträchtlichen Staubentwicklung führt.In the operation of such mixing devices, there is often an overpressure inside the mixing container which, when the mixing container is opened, often leads to a considerable amount of dust, depending on the type of material to be mixed.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Mischvorrichtung entsprechend dem Oberbegriff des Anspruches 1 so auszubilden, daß eine störende Staubentwicklung beim Öffnen des Mischbehälters vermieden wird.The invention is therefore based on the object of designing a mixing device according to the preamble of claim 1 in such a way that disruptive dust formation when the mixing container is opened is avoided.

Diese Aufgabe wird erfindungsgemäß durch das kennzeichnende Merkmal des Anspruches 1 gelöst.This object is achieved by the characterizing feature of claim 1.

Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Appropriate embodiments of the invention are the subject of the dependent claims.

Erfindungsgemäß ist somit am zweiten Behälterteil eine Absaugeinrichtung mit einem Ventilkörper vorgesehen, durch den eine in einer Wand des zweiten Behälterteiles vorgesehene Absaugöffnung wahlweise absperr- oder freigebbar ist. Mittels einer derartigen Absaugeinrichtung ist es möglich, vor dem Öffnen des Mischbehälters nach Durchführung eines Mischvorganges den im Mischbehälter herrschenden Überdruck abzubauen und gebildeten Staub abzusaugen, so daß beim anschließenden Öffnen des Mischbehälters keine Staubbelästigung für die Umgebung mehr auftritt.According to the invention, a suction device with a valve body is thus provided on the second container part, through which a suction opening provided in a wall of the second container part can be optionally blocked or released. By means of such a suction device, it is possible to reduce the excess pressure prevailing in the mixing container and to form dust before the mixing container is opened after a mixing operation has been carried out suction, so that when the mixing container is subsequently opened, there is no longer any dust nuisance to the environment.

Eine zweckmäßige Ausgestaltung der Erfindung sieht vor, in den Mischbehälter Schutzgas einzuführen, um den Mischvorgang unter Explosionsschutzbedingungen durchzuführen. Die erfindungsgemäße Absaugeinrichtung gestattet hierbei beim Füllen des Mischbehälters mit dem Schutzgas den Abzug der Sauerstoffatmosphäre und nach Beendigung des Mischvorganges das Abziehen des Schutzgases.An expedient embodiment of the invention provides for protective gas to be introduced into the mixing container in order to carry out the mixing process under explosion protection conditions. The suction device according to the invention allows the oxygen atmosphere to be drawn off when the mixing container is filled with the protective gas and, after the mixing process has ended, the protective gas to be removed.

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung veranschaulicht.Two embodiments of the invention are illustrated in the drawing.

Es zeigen

  • Fig.1 eine perspektivische Seitenansicht einer erfindungsgemäßen Mischvorrichtung in der Ausgangsstellung,
  • Fig.2 einen Vertikalschnitt durch eine mit der Absaugeinrichtung versehene Zone des zweiten Behälterteiles,
  • Fig.3 einen Teilschnitt durch ein zweites Ausführungsbeispiel, bei dem Schutzgas in den Mischbehälter eingeführt werden kann.
Show it
  • 1 is a perspective side view of a mixing device according to the invention in the starting position,
  • 2 shows a vertical section through a zone of the second container part provided with the suction device,
  • 3 shows a partial section through a second embodiment, in which protective gas can be introduced into the mixing container.

Die in den Fig.1 und 2 als erstes Ausführungsbeispiel der Erfindung dargestellte Mischvorrichtung enthält einen Mischbehälter, der aus zwei schalenförmigen Behälterteilen 1 und 2 besteht, die mit Hilfe von Spannvorrichtungen 3 an ihren einander zugewandten offenen Enden fest miteinander verbunden werden können. Der mit einem Bodenauslauf 4 versehene erste Behälterteil 1 kann mit Hilfe einer Fahrpalette 5 verfahren werden.The mixing device shown in FIGS. 1 and 2 as the first exemplary embodiment of the invention contains a mixing container which consists of two bowl-shaped container parts 1 and 2, which with the aid of clamping devices 3 at their open ends facing one another can be firmly connected. The first container part 1 provided with a floor outlet 4 can be moved with the help of a driving pallet 5.

Der zweite Behälterteil 2 enthält in seinem Innern Mischwerkzeuge 6, die durch einen Antriebsmotor 7 angetrieben werden. Der zweite Behälterteil 2 ist an einer säulenartigen ortsfesten Halterung 8 stationär gehaltert, und zwar mittels einer Schwenkwelle 8a mit horizontaler Schwenkachse 9. Der Antrieb der Schwenkwelle 8a erfolgt durch einen Schwenkantrieb 10, bestehend aus einem Antriebsmotor 10a und einem Aufsteckgetriebe 10b.The second container part 2 contains mixing tools 6 inside, which are driven by a drive motor 7. The second container part 2 is held stationary on a column-like stationary holder 8, specifically by means of a swivel shaft 8a with a horizontal swivel axis 9. The swivel shaft 8a is driven by a swivel drive 10 consisting of a drive motor 10a and a slip-on gear 10b.

Der zweite Behälterteil 2 kann durch den Schwenkantrieb 10 um etwa 180° um die horizontale Schwenkachse 9 geschwenkt werden, und zwar zwischen einer Ausgangsstellung (Fig.1), in der der zweite Behälterteil 2 den Deckel des Mischbehälters bildet, und einer Mischstellung, in der der zweite Behälterteil 2 den Boden des Mischbehälters bildet.The second container part 2 can be pivoted about 180 ° about the horizontal pivot axis 9 by the pivot drive 10, namely between an initial position (FIG. 1) in which the second container part 2 forms the lid of the mixing container and a mixing position in which the second container part 2 forms the bottom of the mixing container.

An dem zweiten Behälterteil 2, und zwar an dessen in der Ausgangsstellung oben befindlicher Bodenwand 2a, ist eine Absaugeinrichtung 11 befestigt. Sie enthält ein rohrförmiges, vorzugsweise zylindrisches Absauggehäuse 12, das im Bereich seines - in der Zeichnung - oberen Endes 12a einen Anschlußstutzen 13 aufweist, der durch eine Rohrkupplung 14 (vorzugsweise nach Art einer Schnellkupplung) mit einer Absaugleitung 15 verbunden werden kann. Diese Absaugleitung 15 ist Teil einer Absauganlage mit (nicht veranschaulichtem) Filter und Absauggebläse. Eventuell kann das mit dem Anschlußstutzen 13 verbindbare Ende der Absaugleitung 15 auch flexibel ausgebildet sein, um eine schnelle Kupplungsverbindung mit dem Anschlußstutzen 13 zu ermöglichen.A suction device 11 is fastened to the second container part 2, specifically to its bottom wall 2a located in the starting position. It contains a tubular, preferably cylindrical suction housing 12, which in the region of its - in the drawing - upper end 12a has a connecting piece 13 which can be connected to a suction line 15 by a pipe coupling 14 (preferably in the manner of a quick coupling). This suction line 15 is part of a suction system with (not shown) filter and suction fan. The end of the suction line 15 that can be connected to the connecting piece 13 may also be flexible in order to enable a quick coupling connection to the connecting piece 13.

Das Absauggehäuse 12 ist an der Bodenwand 2a befestigt, beispielsweise angeschweißt. Es ragt mit seinem unteren Ende durch einen äußeren Bodenwandteil 2a′ hindurch und ist an einem inneren Bodenwandteil 2a˝ an einer Stelle angeschlossen, an der eine kreisförmige Absaugöffnung 16 in dem inneren Bodenwandteil 2a′ des zweiten Behälterteiles 2 vorgesehen ist. Die Absaugöffnung 16 ist von einem kreisringförmigen, sich in Richtung auf die Absaugeinrichtung 11 erweiternden Dichtungssitz 17 umgeben.The suction housing 12 is fastened to the bottom wall 2a, for example welded on. It projects with its lower end through an outer bottom wall part 2a 'and is connected to an inner bottom wall part 2ateil at a point at which a circular suction opening 16 is provided in the inner bottom wall part 2a' of the second container part 2. The suction opening 16 is surrounded by an annular sealing seat 17 which widens in the direction of the suction device 11.

Die Absaugeinrichtung 11 enthält einen Ventilkörper 18, der im wesentlichen in Form einer kreisförmigen Scheibe ausgebildet ist. Dieser Ventilkörper 18 paßt genau in den Dichtungssitz 17 der Absaugöffnung 16. Zu diesem Zweck weist der Ventilkörper 18 einen sich gegen den Dichtungssitz 17 verjüngenden Dichtungsabschnitt 18a auf. Am Umfang dieses Dichtungsabschnittes 18a ist eine Nut 19 vorgesehen, in die ein Dichtungsring 20 eingelegt ist.The suction device 11 contains a valve body 18 which is essentially in the form of a circular disk. This valve body 18 fits exactly into the sealing seat 17 of the suction opening 16. For this purpose, the valve body 18 has a sealing section 18a which tapers against the sealing seat 17. A groove 19 is provided on the circumference of this sealing section 18a, into which a sealing ring 20 is inserted.

Der Ventilkörper 18 kann zwischen der in Fig.2 in ausgezogenen Linien dargestellten Schließstellung und der in strichpunktierten Linien veranschaulichten Öffnungsstellung 18′ innerhalb des Absauggehäuses 12 axial hin- und herbewegt werden (entsprechend dem Doppelpfeil 21). In der Schließstellung, die der Ventilkörper 18 in der Mischstellung des Mischbehälters einnimmt, schließt der Ventilkörper 18 die Absaugöffnung 16 bündig mit der Innenwand des inneren Bodenwandteiles 2a˝ ab. In der Ausgangsstellung des Mischbehälters kann dagegen der Ventilkörper 18 in seine Öffnungsstellung 18′ gebracht und dadurch die Absaugöffnung 16 geöffnet werden.The valve body 18 can be moved axially back and forth between the closed position shown in FIG. 2 in solid lines and the open position 18 ′ shown in broken lines in the suction housing 12 (corresponding to the double arrow 21). In the closed position, which the valve body 18 occupies in the mixing position of the mixing container, the valve body 18 closes the suction opening 16 flush with the inner wall of the inner bottom wall part 2a˝. In the starting position of the mixing container, on the other hand, the valve body 18 can be brought into its open position 18 'and the suction opening 16 can thereby be opened.

Wie Fig.2 erkennen läßt, besitzt das rohrförmige Absauggehäuse 12 einen lichten Querschnitt, der größer ist als der Querschnitt der Absaugöffnung 16 und der Durchmesser des Ventilkörpers 18. Auf diese Weise ergibt sich in der Öffnungsstellung 18′ des Ventilkörpers 18 ein Absaugringspalt 22 zwischen dem Umfang des Ventilkörpers 18 und der Innenwand des Absauggehäuses 12. Durch diesen Absaugringspalt 22 können staubhaltige Gase entsprechend den Pfeilen 23 von der Absaugöffnung 16 zum Anschlußstutzen 13 gelangen.As can be seen in FIG. 2, the tubular suction housing 12 has a clear cross section which is larger than the cross section of the suction opening 16 and the diameter of the valve body 18. In this way, in the open position 18 'of the valve body 18, there is a suction ring gap 22 between the circumference of the valve body 18 and the inner wall of the suction housing 12. Through this suction ring gap 22, dust-containing gases according to the arrows 23 from the suction opening 16 to the connecting piece 13 arrive.

Zur Betätigung des Ventilkörpers 18 ist bei dem dargestellten Ausführungsbeispiel eine druckmittelbetätigte Zylinder-Kolben-Einheit in Form eines Druckluftzylinders 24 vorgesehen, der an das der Absaugöffnung 16 abgewandte obere Ende 12a des Absauggehäuses 12 axial angeflanscht ist (Flanschverbindung 25). Die Kolbenstange 24a des Druckluftzylinders 24 ist mit dem Ende 26a einer Betätigungsstange 26 fest verbunden, deren anderes Ende 26b den Ventilkörper 18 trägt. Durch Betätigung des Druckluftzylinders 24 kann somit der Ventilkörper 18 in Richtung der Gehäuselängsachse 12c hin- und herbewegt werden.To actuate the valve body 18, a pressure-medium-actuated cylinder-piston unit in the form of a compressed air cylinder 24 is provided in the illustrated embodiment, which is axially flanged to the upper end 12a of the suction housing 12 facing away from the suction opening 16 (flange connection 25). The piston rod 24a of the compressed air cylinder 24 is fixedly connected to the end 26a of an actuating rod 26, the other end 26b of which supports the valve body 18. By actuating the compressed air cylinder 24, the valve body 18 can thus be moved back and forth in the direction of the housing longitudinal axis 12c.

Das Herstellen und Lösen der Kupplungsverbindung zwischen der Absaugleitung 15 und dem Anschlußstutzen 13 kann durch Endschalter einer zur Mischvorrichtung gehörenden Steuereinrichtung gemeldet werden, so daß die Betätigung des Ventilkörpers 18 durch den Druckluftzylinder 24 in Abhängigkeit von der Betätigung dieser Endschalter gesteuert wird.The establishment and release of the coupling connection between the suction line 15 and the connecting piece 13 can be reported by limit switches of a control device belonging to the mixing device, so that the actuation of the valve body 18 by the compressed air cylinder 24 is controlled as a function of the actuation of these limit switches.

Der Betrieb der beschriebenen Mischvorrichtung kann - insbesondere was die Absaugung anbelangt - wie folgt durchgeführt werden:

  • In der Mischstellung des Mischbehälters wird die im zweiten Behälterteil 2 vorhandene Absaugöffnung 16 mittels des Ventilkörpers 18 vollkommen geschlossen gehalten. Die Absaugöffnung 16 wird zu diesem Zweck geschlossen, ehe der Mischbehälter aus der Ausgangsstellung in die Mischstellung geschwenkt wird.
  • Wird der Mischbehälter nach dem Mischvorgang wieder in die Ausgangsstellung geschwenkt, so wird die Absaugeinrichtung 11 (über den Anschlußstutzen 13 und die Rohrkupplung 14) an die Absaugleitung 15 angekuppelt. Daraufhin wird die Absaugöffnung 16 vom Ventilkörper freigegeben.
  • Der Innenraum des noch verschlossenen Mischbehälters wird nun über die Absaugeinrichtung 11 an die Absauganlage angeschlossen. Der Absaugvorgang kann in der Praxis beispielsweise 10 s dauern. Auf diese Weise wird der Überdruck im Mischbehälter abgebaut und der Staub entfernt.
  • Sodann werden die beiden Behälterteile 1 und 2 voneinander gelöst, wobei keine Staubbelästigung der Umgebung eintritt. Die Absaugöffnung 16 wird dann durch den Ventilkörper 18 wieder verschlossen.
The operation of the mixing device described can be carried out as follows, particularly as far as the extraction is concerned:
  • In the mixing position of the mixing container, the suction opening 16 present in the second container part 2 is completely closed by means of the valve body 18 held. The suction opening 16 is closed for this purpose before the mixing container is pivoted from the starting position into the mixing position.
  • If the mixing container is pivoted back into the starting position after the mixing process, the suction device 11 is coupled to the suction line 15 (via the connecting piece 13 and the pipe coupling 14). Then the suction opening 16 is released from the valve body.
  • The interior of the still closed mixing container is now connected to the suction system via the suction device 11. In practice, the suction process can take 10 s, for example. In this way, the excess pressure in the mixing container is reduced and the dust is removed.
  • The two container parts 1 and 2 are then detached from one another, with no dust nuisance in the environment. The suction opening 16 is then closed again by the valve body 18.

Fig.3 zeigt eine weitere Ausgestaltung der erfindungsgemäßen Mischvorrichtung, die es ermöglicht, den Mischvorgang unter Schutzgasatmosphäre (beispielsweise unter Stickstoffatmosphäre) durchzuführen, um auf diese Weise Explosionsschutzbedingungen zu erfüllen.3 shows a further embodiment of the mixing device according to the invention, which makes it possible to carry out the mixing process under a protective gas atmosphere (for example under a nitrogen atmosphere) in order to meet explosion protection conditions in this way.

Fig.3 veranschaulicht hierbei lediglich den Bereich, der in Fig.1 mit gestrichelten Linien umgrenzt und mit dem Bezugszeichen x gekennzeichnet ist.3 only illustrates the area which is delimited in FIG. 1 with dashed lines and identified by the reference symbol x.

Man erkennt in Fig.3 die Schwenkwelle 8a, über die das Aufsteckgetriebe 10b des Schwenkantriebes 10 mit dem zweiten Behälterteil 2 drehfest verbunden ist. Diese Schwenkwelle 8a ist mittels Lagern 27 in der ortsfesten Halterung 8 drehbar gelagert. Das Aufsteckgetriebe 10b ist mittels Schrauben 28 an der Halterung 8 fixiert.3 shows the swivel shaft 8a, via which the slip-on gear 10b of the swivel drive 10 with the second container part 2 is rotatably connected. This pivot shaft 8a is rotatably supported by bearings 27 in the fixed bracket 8. The slip-on gear 10b is fixed on the bracket 8 by means of screws 28.

Die Schwenkwelle 8a ist beim Ausführungsbeispiel gemäß Fig.3 als Hohlwelle ausgebildet. In dieser Hohlwelle ist eine Rohrleitung 29 angeordnet, die zur Zuführung von Schutzgas dient und sich mit der Schwenkwelle 8a dreht.In the exemplary embodiment according to FIG. 3, the pivot shaft 8a is designed as a hollow shaft. In this hollow shaft, a pipe 29 is arranged, which serves for the supply of protective gas and rotates with the pivot shaft 8a.

Das äußere Ende der Rohrleitung 29 steht über einen Dichtkopf 30 mit einer stationär und drehfest verlegten (nicht veranschaulichten) Schutzgas-Zuführleitung in Verbindung, wobei zwischen dem Dichtkopf 30 und der Rohrleitung 29 eine abgedichtete Drehverbindung 31 vorhanden ist.The outer end of the pipeline 29 is connected via a sealing head 30 to a stationary and rotationally fixed (not illustrated) protective gas supply line, a sealed rotary connection 31 being present between the sealing head 30 and the pipeline 29.

An der Einmündung der Rohrleitung 29 in den Innenraum des zweiten Behälterteiles 2 ist ein Ventil 32 angeordnet, dessen Einzelheiten in Fig.3 nicht veranschaulicht sind. Dieses Ventil 32 öffnet unter Druck (d.h. dann, wenn über die Rohrleitung 29 unter Druck stehendes Schutzgas zugeführt wird). Im drucklosen Zustand schließt das Ventil und ist vorzugsweise bündig mit der Innenwand des zweiten Behälterteiles 2.At the mouth of the pipeline 29 into the interior of the second container part 2, a valve 32 is arranged, the details of which are not illustrated in FIG. This valve 32 opens under pressure (i.e. when protective gas under pressure is supplied via the pipeline 29). In the depressurized state, the valve closes and is preferably flush with the inner wall of the second container part 2.

In dem anhand von Fig.1 und 2 beschriebenen Absaugsystem kann eine Meßstelle vorgesehen werden, an die ein Restsauerstoff-Meßsystem angeschlossen wird.In the extraction system described with reference to FIGS. 1 and 2, a measuring point can be provided to which a residual oxygen measuring system is connected.

Der Verfahrensablauf beim Ausführungsbeispiel gemäß Fig.3 ist - was die erfindungsgemäßen Anlagenteile anbelangt - beispielsweise wie folgt:The process sequence in the exemplary embodiment according to FIG. 3 is - as far as the system parts according to the invention are concerned:

Der mit dem Produkt gefüllte erste Behälterteil 1 wird unter den zweiten Behälterteil 2 gefahren und mit diesem über die pneumatischen Spannvorrichtungen 3 gekuppelt. Ist die Kupplungsverbindung hergestellt (was durch Endschalter gemeldet wird) und befinden sich die Hubzylinder (die den ersten Behälterteil 1 zur Herstellung der Kupplungsverbindung angehoben haben) wieder in ihrer unteren Position, so wird über ein (in der Zeichnung nicht veranschaulichtes) Ventil Schutzgas (beispielsweise Stickstoff) der Rohrleitung 29 zugeführt und über das Ventil 32 in den Mischbehälter eingeleitet. Der Zuführdruck kann beispielsweise 1 bis 2 bar betragen. Gleichzeitig öffnet der Ventilkörper 18 der Absaugeinrichtung 11, so daß über die Absaugleitung 15 die sich im Mischbehälter bildende Mischatmosphäre (Sauerstoff/Schutzgas) abgesaugt wird.The first container part 1 filled with the product becomes moved under the second container part 2 and coupled with this via the pneumatic clamping devices 3. If the coupling connection is established (which is reported by the limit switch) and the lifting cylinders (which have raised the first container part 1 for establishing the coupling connection) are again in their lower position, protective gas (for example Nitrogen) supplied to the pipeline 29 and introduced into the mixing container via the valve 32. The feed pressure can be, for example, 1 to 2 bar. At the same time, the valve body 18 of the suction device 11 opens, so that the mixed atmosphere (oxygen / protective gas) which is formed in the mixing container is sucked off via the suction line 15.

Ist nach einer gewissen Zeit im Mischbehälter eine reine Schutzgasatmosphäre vorhanden (was durch das oben erwähnte Restsauerstoff-Meßsystem in der Absauganlage festgestellt werden kann), so werden die Ventile auf der Zuführseite und Absaugseite geschlossen. Der Mischvorgang kann nun unter Schutzgas ablaufen. Da der Mischbehälter nach außen hermetisch abgeschlossen ist, braucht dabei zur Aufrechterhaltung der Explosionsschutzbedingungen kein weiteres Schutzgas zugeführt zu werden.If a pure protective gas atmosphere is present in the mixing container after a certain time (which can be determined by the above-mentioned residual oxygen measuring system in the suction system), the valves on the supply side and suction side are closed. The mixing process can now take place under protective gas. Since the mixing container is hermetically sealed from the outside, no further protective gas needs to be added to maintain the explosion protection conditions.

Nach Beendigung des Mischvorganges wird der Mischbehälter in der bereits erläuterten Weise über die Absaugeinrichtung 11 abgesaugt. Anschließend kann der Mischbehälter geöffnet werden.After the mixing process has ended, the mixing container is suctioned off via the suction device 11 in the manner already explained. The mixing container can then be opened.

Claims (8)

1. Mixing device for bulk material in powdered and granular form, containing
a) a mixing vessel which consists of two bowl-shaped vessel parts (1, 2) which can be connected to one another and of which the first vessel part (1) provided with a base outlet (4) is movable and the second vessel part (2) equipped with mixing tools (6) which are driven in rotation is mounted so as to be stationary,
b) a stationary mounting (8) on which the second vessel part (2) is mounted in such a way that it can be pivoted by approximately 180° about a horizontal pivot axis (9) between a starting position, in which the second vessel part (2) forms the cover of the mixing vessel, and a mixing position, in which this second vessel part forms the base of the mixing vessel,
characterised by the following feature:
c) an extraction arrangement (11) is provided on the second vessel part (2) with a valve body (18) by means of which an extraction opening (16) provided in a wall (2a, 2a˝) of the second vessel part (2) can be shut off or opened as required.
2. Mixing device as claimed in claim 1, characterised in that the extraction arrangement (11) contains a tubular extraction housing (12) which has a connection (13) which can be connected to an extraction pipe (15) and in which is arranged an actuating rod (26) which moves to and fro in the direction of the longitudinal axis of the housing (12c), bears the valve body (18) on its free end (26b) and isconnected at its other end (26a) to an actuating drive (24).
3. Mixing device as claimed in claim 2, characterised in that the tubular extraction housing (120 has an internal cross-section which is greater than the cross-section of the extraction opening (16), and the disc-shaped valve body (18) which can be moved into this extraction opening so as to fit. and form a seal is constructed of such a size that there is an annular extraction gap (22) between its periphery and the inner wall of the extraction housing in the open position of the valve body.
4. Mixing device as claimed in claim 3, characterised in that a circular seal seat (17) which widens conically is provided in the extraction opening (16), and the valve body (18) has a sealing section (18a) of complementary construction to the seal seat (17) with a sealing ring (20) placed in it.
5. Mixing device as claimed in claim 2, characterised in that the actuating drive is formed by a cylinder-piston unit (24) operated by a pressure medium.
6. Mixing device as claimed in claim 1, characterised by an arrangement for introducing protective gas into the mixing vessel.
7. Mixing device as claimed in claim 6, in which the second vessel part (2) can be pivoted by means of a pivot shaft (8a) and a geared motor (10a, 10b) about the horizontal pivot axis (9) between the starting position and the mixing position, characterised in that a pipe (2), which rotates with the pivot shaft (8a) and to which a stationary protective gas delivery pipe is connected so as to be fixed against rotation by means of a sealing head (30) provided with a rotary connection (31), is arranged inside the pivot shaft (8a) and serves for delivery of the protective gas.
8. Mixing device as claimed in claim 7, characterised in that a valve (32) which opens under pressure and in the pressureless state closes flush with the inner wall of the second vessel part (2) is arranged at the point where the pipe (29) opens into the interior of the second vessel part (2).
EP89116941A 1988-11-07 1989-09-13 Mixing device Expired - Lifetime EP0367948B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3837763 1988-11-07
DE3837763A DE3837763A1 (en) 1988-11-07 1988-11-07 MIXING DEVICE

Publications (2)

Publication Number Publication Date
EP0367948A1 EP0367948A1 (en) 1990-05-16
EP0367948B1 true EP0367948B1 (en) 1992-03-04

Family

ID=6366663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116941A Expired - Lifetime EP0367948B1 (en) 1988-11-07 1989-09-13 Mixing device

Country Status (3)

Country Link
EP (1) EP0367948B1 (en)
DE (2) DE3837763A1 (en)
ES (1) ES2030250T3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4204086C2 (en) * 1992-02-12 1995-07-13 Ruberg Mischtechnik Kg mixer
DE4419598C2 (en) * 1994-06-03 1998-10-29 Ruberg Mischtechnik Kg mixer
DE102013111158B3 (en) * 2013-10-09 2014-11-13 Dr. Herfeld Gmbh & Co. Kg Method for mixing a mixed material within a closed mixing chamber and industrial mixers
CN108905766A (en) * 2018-08-23 2018-11-30 烟台市鸿风机有限公司 A kind of batch mixer for preventing dust from revealing
DE102019123666B3 (en) 2019-09-04 2020-07-30 Dr. Herfeld Gmbh & Co. Kg Blender
DE202019104874U1 (en) 2019-09-04 2019-09-18 Dr. Herfeld Gmbh & Co. Kg mixer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7401746U (en) * 1974-05-16 Willmes J
DE2110047C2 (en) * 1971-03-03 1983-01-20 Herfeld, Dipl.-Volksw. Dr., Friedrich Walter Adolf, 5982 Neuenrade Mixing device
DE3206385C2 (en) * 1982-02-22 1986-03-27 Wolfram Dipl.-Ing. 6074 Rödermark Reimelt Pneumatic mixer for flowable bulk goods
DE3426159A1 (en) * 1984-07-16 1986-01-23 Herfeld, Friedrich Walter, Dr., 5982 Neuenrade MIXING DEVICE
DE3543913A1 (en) * 1985-12-12 1987-06-19 Herfeld Friedrich W MIXING DEVICE

Also Published As

Publication number Publication date
DE58900923D1 (en) 1992-04-09
DE3837763A1 (en) 1990-05-17
EP0367948A1 (en) 1990-05-16
ES2030250T3 (en) 1992-10-16

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