EP0358120B1 - Mixing plant for granulated products especially core sand - Google Patents

Mixing plant for granulated products especially core sand Download PDF

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Publication number
EP0358120B1
EP0358120B1 EP89116166A EP89116166A EP0358120B1 EP 0358120 B1 EP0358120 B1 EP 0358120B1 EP 89116166 A EP89116166 A EP 89116166A EP 89116166 A EP89116166 A EP 89116166A EP 0358120 B1 EP0358120 B1 EP 0358120B1
Authority
EP
European Patent Office
Prior art keywords
mixing
source
mixing apparatus
nozzles
core sand
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89116166A
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German (de)
French (fr)
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EP0358120A3 (en
EP0358120A2 (en
Inventor
Werner Lüber
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Individual
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Individual
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Publication date
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Publication of EP0358120A2 publication Critical patent/EP0358120A2/en
Publication of EP0358120A3 publication Critical patent/EP0358120A3/en
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Publication of EP0358120B1 publication Critical patent/EP0358120B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/0463—Plants

Definitions

  • the present invention relates to a mixing device for granular goods, in particular core sand, with a mixing container in which rotary mixer arms extend, and with a device for blowing the inner walls resp. Mixer arms using compressed air.
  • mixing devices of the aforementioned type have already become known from EP-A-0 053 759 and DE-A-2 245 302, which allow the residues to be blown out independently, but the incrustations of the wall of the mixing container and mixer arms must first be knocked off .
  • the object of the present invention is therefore to create a mixing device of the aforementioned type which can be optimally and quickly cleaned after each mixing process.
  • the clean-blowing device comprises nozzles which are directed specifically at mixer arms and the bottom and jacket of the mixing container and are in flow connection with a compressed air source, and in that at least one suction opening in flow connection with a vacuum source is arranged in the mixing container.
  • the arrangement is expedient such that the compressed air nozzles are located in the upper edge region of the mixing container, the nozzles then being connected to one another by a ring line.
  • suction opening in the lid advantageously extends of the mixing container.
  • the vacuum source can be program-controlled via the control part of the mixing device.
  • the rotation mixing device schematically indicated in the drawing comprises a cylindrical mixing container 1, in which a central shaft 14 rotates, which can be driven by a motor 15. Mixer arms 2 protrude from the shaft 14 in a plane directly above the housing base 13. In this housing base 13 there is an outlet opening, not shown, for the mix.
  • the mixer container 1 is further provided with a lid 8, which can be removed in a suitable manner, not shown here, in order to be able to introduce sand from a sand metering device 16 and an additive from an additive metering device 17 into the mixing container 1.
  • the whole thing is regulated via the control part 9 of the system.
  • specifically directed nozzles 3 are arranged on the mixer arms 2, as well as the bottom 13 and jacket of the mixing container 1, which are located in the upper edge region of the mixing container 1 and, connected by a ring line 7, are in flow connection with a compressed air source 4.
  • a suction opening 6, preferably in the cover 8 of the mixing container 1, is essential to the invention, which opening is in flow connection with a vacuum source 5.
  • the compressed air source 4 and the vacuum source 5 are there Can be program controlled directly or via suitable control valve means, not shown, by said control part 9.
  • the nozzles can be used for mixing the material to be mixed.
  • the nozzles can also be used to build up a dust and odor-reducing air cushion over the mix.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Accessories For Mixers (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)

Abstract

The mixing plant having a mixing tank (1) in which mixer arms (2) extend is distinguished by nozzles (3) which are directed in a specific manner at mixer arms (2) and also at the bottom and shell of the mixing tank (1), and are in flow connection with a compressed air source (4), and furthermore by at least one suction opening (6) in the mixing tank (1), which is in flow connection with a negative pressure source (5). This arrangement permits optimum rapid cleaning of the mixing tank after a mixing operation. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Mischvorrichtung für granulare Güter, insbesondere Kernsand, mit einem Mischbehälter, in dem sich Rotationsmischerarme erstrecken, sowie mit einer Vorrichtung zum Reinblasen der Innenwände resp. Mischerarme mittels Druckluft.The present invention relates to a mixing device for granular goods, in particular core sand, with a mixing container in which rotary mixer arms extend, and with a device for blowing the inner walls resp. Mixer arms using compressed air.

Bei der Herstellung von plastischem Kernsand für das sogenannte Cold-Box-Verfahren, das Hot-Box-Verfahren, das C02-Erstarrungsverfahren, ferner von Zementsand, Schamotte, Chromerzsand u.dgl. verlangt das Vermischen des Sandes mit Bindemitteln und/oder Katalysatoren ein hohes Mass an Sauberkeit der Mischeinrichtung, um das Mischgut von Rückständen aus vorangegangenen Chargen frei zuhalten, welche insbesondere die Zerfallseigenschaften der Kerne negativ beeinflussen würden.In the production of plastic core sand for the so-called cold box process, the hot box process, the CO 2 solidification process, and also of cement sand, chamotte, chrome ore sand and the like. the mixing of the sand with binders and / or catalysts requires a high degree of cleanliness of the mixing device in order to keep the mix free of residues from previous batches, which in particular would negatively influence the decay properties of the cores.

Hierfür sind durch die EP-A-0 053 759 und DE-A-2 245 302 bereits Mischvorrichtungen der vorgenannten Art bekannt geworden, die zwar ein selbstständiges Ausblasen der Rückstände gestatten, wobei aber vorgängig die Verkrustungen von Wandung des Mischbehälters und Mischerarme abgeklopft werden müssen.For this purpose, mixing devices of the aforementioned type have already become known from EP-A-0 053 759 and DE-A-2 245 302, which allow the residues to be blown out independently, but the incrustations of the wall of the mixing container and mixer arms must first be knocked off .

Solche Handsäuberungen genügen aber weder bezüglich den heutigen Anforderungen an minimalsten Stillstandszeiten noch bezüglich erforderlichem Reinheitsgrad.However, such manual cleaning is not sufficient in terms of today's requirements for minimum downtimes or in terms of the required degree of purity.

Aufgabe der vorliegenden Erfindung ist deshalb die Schaffung einer Mischvorrichtung der vorgenannten Art, welche sich nach jedem Mischvorgang optimal und schnell reinigen lässt.The object of the present invention is therefore to create a mixing device of the aforementioned type which can be optimally and quickly cleaned after each mixing process.

Dies wird erfindungsgemäss dadurch erreicht, dass die Reinblasvorrichtung auf Mischerarme, sowie Boden und Mantel des Mischbehälters gezielt gerichtete, mit einer Druckluftquelle in Strömungsverbindung stehende Düsen umfasst und dass ferner mindestens eine, mit einer Unterdruckquelle in Strömungsverbindung stehende Absaugöffnung im Mischbehälter angeordnet ist.This is achieved according to the invention in that the clean-blowing device comprises nozzles which are directed specifically at mixer arms and the bottom and jacket of the mixing container and are in flow connection with a compressed air source, and in that at least one suction opening in flow connection with a vacuum source is arranged in the mixing container.

Bei einer bevorzugten Ausführungsform ist dann die Anordnung zweckmässig so, dass sich die Druckluft-Düsen im oberen Randbereich des Mischbehälters befinden, wobei dann die Düsen durch eine Ringleitung miteinander verbunden sind.In a preferred embodiment, the arrangement is expedient such that the compressed air nozzles are located in the upper edge region of the mixing container, the nozzles then being connected to one another by a ring line.

Ferner erstreckt sich vorteilhaft die Absaugöffnung im Deckel des Mischbehälters.Furthermore, the suction opening in the lid advantageously extends of the mixing container.

Weiter ist es vorteilhaft, wenn die Unterdruckquelle über den Steuerteil der Mischvorrichtung programmsteuerbar sind.It is also advantageous if the vacuum source can be program-controlled via the control part of the mixing device.

Durch diese Massnahmen ist es nunmehr möglich, in jeder Phase des Betriebes der Mischvorrichtung, insbesondere aber unmittelbar nach einem Mischvorgang und Entleeren des Mischbehälters die Rückstände der vorangegangenen Charge unter hohem Druck von den Mischerarmen und den Behälterwandungen wegzublasen und den aufgewirbelten Kernsand abzusaugen, wodurch bereits in wenigen Augenblicken eine optimale Reinigung erzielbar ist. Diese Vorgänge können zudem automatisiert und vorprogrammiert werden. Es ist sogar möglich, die Düsen für die Durchmischung des Mischgutes mit einzusetzen, indem diese auch während des Mischvorganges wenigstens temporär in Betrieb gehalten werden und, gegebenenfalls mit geringerem Strömungsdruck, Luft in das Mischgut einblasen.Through these measures, it is now possible to blow off the residues of the previous batch under high pressure from the mixer arms and the container walls and to suck off the whirled up core sand in every phase of the operation of the mixing device, but especially immediately after a mixing process and emptying the mixing container, and thereby sucking off the whirled up core sand, thereby already in optimal cleaning can be achieved in a few moments. These processes can also be automated and preprogrammed. It is even possible to use the nozzles for the mixing of the mixed material by keeping them in operation at least temporarily even during the mixing process and blowing air into the mixed material, possibly with a lower flow pressure.

Eine beispielsweise Ausführungsform des Erfindungsgegenstandes ist nachfolgend anhand der Zeichnung, welche schematisch eine Mischvorrichtung für Kernsand in einer Seitenansicht veranschaulicht, näher erläutert.An example embodiment of the subject matter of the invention is explained in more detail below with reference to the drawing, which schematically illustrates a mixing device for core sand in a side view.

Die in der Zeichnung schematisch angedeutete hier Rotationsmischvorrichtung umfasst einen zylindrischen Mischbehälter 1, in dem eine zentrische Welle 14 umläuft, die von einem Motor 15 antreibbar ist. Von der Welle 14 ragen in einer Ebene unmittelbar über dem Gehäuseboden 13 Mischerarme 2 ab. In diesem Gehäuseboden 13 ist eine nicht näher gezeigte Auslassöffnung für das Mischgut vorgesehen. Der Mischerbehälter 1 ist weiter mit einem Deckel 8 versehen, der in geeigneter, hier nicht näher gezeigten Weise wegstellbar ist, um Sand von einem Sanddosierer 16 und ein Additiv von einem Additivdosierer 17 in den Mischbehälter 1 einbringen zu können. Das Ganze wird über den Steuerteil 9 der Anlage geregelt.The rotation mixing device schematically indicated in the drawing comprises a cylindrical mixing container 1, in which a central shaft 14 rotates, which can be driven by a motor 15. Mixer arms 2 protrude from the shaft 14 in a plane directly above the housing base 13. In this housing base 13 there is an outlet opening, not shown, for the mix. The mixer container 1 is further provided with a lid 8, which can be removed in a suitable manner, not shown here, in order to be able to introduce sand from a sand metering device 16 and an additive from an additive metering device 17 into the mixing container 1. The whole thing is regulated via the control part 9 of the system.

Soweit sind solche Mischvorrichtungen bekannt und bedürfen so keiner weiteren Erläuterung.So far, such mixing devices are known and do not require any further explanation.

Erfindungswesentlich ist nun, dass auf die Mischerarme 2, sowie Boden 13 und Mantel des Mischbehälters 1 gezielt gerichtete Düsen 3 angeordnet sind, welche sich im oberen Randbereich des Mischbehälters 1 befinden und, verbunden durch eine Ringleitung 7, mit einer Druckluftquelle 4 in Strömungsverbindung stehen.It is essential to the invention that specifically directed nozzles 3 are arranged on the mixer arms 2, as well as the bottom 13 and jacket of the mixing container 1, which are located in the upper edge region of the mixing container 1 and, connected by a ring line 7, are in flow connection with a compressed air source 4.

Ferner ist eine Absaugöffnung 6, vorzugsweise im Deckel 8 des Mischbehälters 1, erfindungswesentlich, welche Oeffnung mit einer Unterdruckquelle 5 in Strömungsverbindung steht.Furthermore, a suction opening 6, preferably in the cover 8 of the mixing container 1, is essential to the invention, which opening is in flow connection with a vacuum source 5.

Die Druckluftquelle 4 sowie die Unterdruckquelle 5 sind dabei direkt oder über geeignete, nicht näher gezeigte Regelventilmittel durch den genannten Steuerteil 9 programmsteuerbar.The compressed air source 4 and the vacuum source 5 are there Can be program controlled directly or via suitable control valve means, not shown, by said control part 9.

Diese Massnahmen erlauben eine optimale, programmsteuerbare Schnellreinigung des Mischbehälters, indem die gezielten Druckluftstrahlen alle an den Mischerelementen haftenden Rückstände lösen und zerstäuben, welcher Kernsandstaub dann unmittelbar abgesaugt wird.These measures allow an optimal, programmable, quick cleaning of the mixing container by the targeted compressed air jets dissolving and atomizing all residues adhering to the mixer elements, which core sand dust is then immediately extracted.

Wie vorerwähnt, können die Düsen für die Durchmischung des Mischgutes eingesetzt werden. Zudem können die Düsen aber auch dazu verwendet werden, über dem Mischgut ein staub- und geruchminderndes Luftpolster aufzubauen.As mentioned above, the nozzles can be used for mixing the material to be mixed. In addition, the nozzles can also be used to build up a dust and odor-reducing air cushion over the mix.

Claims (5)

  1. A mixing apparatus for granular materials, in particular core sand, comprising a mixing vessel into which rotational mixer arms or oscillating mixer arms extend, wherein nozzles (3), which are in flow connection with a source of compressed air (4), are selectively directed at said mixer arms (2) as well as at the bottom and walls of said mixing vessel (1), and, moreover, wherein at least one suction opening (6), which is in flow connection with a source of low pressure (5), is disposed in said mixing vessel (1).
  2. The mixing apparatus as defined in claim 1, wherein said compressed-air nozzles (3) are disposed in the upper edge area of said mixing vessel (1).
  3. The mixing apparatus as defined in claim 1, wherein said compressed-air nozzles (3) are connected to one another by a ring pipe (7).
  4. The mixing apparatus as defined in claim 1, wherein said suction opening (6) extends into the cover (8) of said mixing vessel (1).
  5. The mixing apparatus as defined in claim 1, wherein said source of compressed air (4) and said source of low pressure (5) are preprogram-controllable via a control part (9) of said mixing apparatus.
EP89116166A 1988-09-07 1989-09-01 Mixing plant for granulated products especially core sand Expired - Lifetime EP0358120B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3342/88A CH675369A5 (en) 1988-09-07 1988-09-07
CH3342/88 1988-09-07

Publications (3)

Publication Number Publication Date
EP0358120A2 EP0358120A2 (en) 1990-03-14
EP0358120A3 EP0358120A3 (en) 1992-03-18
EP0358120B1 true EP0358120B1 (en) 1996-06-12

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ID=4253897

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116166A Expired - Lifetime EP0358120B1 (en) 1988-09-07 1989-09-01 Mixing plant for granulated products especially core sand

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EP (1) EP0358120B1 (en)
AT (1) ATE139158T1 (en)
CH (1) CH675369A5 (en)
DE (1) DE58909688D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013204491A1 (en) * 2013-03-14 2014-09-18 M-Tec Mathis Technik Gmbh Cleaning procedure for a bulk material mixer as well as bulk material mixer with mixing container to be cleaned
CN116635166A (en) * 2020-12-22 2023-08-22 利乐拉瓦尔集团及财务有限公司 Nozzle of powder processing device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166599B (en) * 1961-07-10 1964-03-26 Vollenda Werk M Siegburg Autom Mixer for powdery, floury or similar substances
DE2245302A1 (en) * 1972-09-15 1974-03-28 Papenmeier Kg Maschf Guenther Automatic cleaner for plastics agglomerates mixer - comprises jets directed onto internal surfaces esp including heaters and coolers
DE3046542A1 (en) * 1980-12-10 1982-07-22 Friedrich Walter Dr. 5982 Neuenrade Herfeld MIXING DEVICE AND METHOD FOR CLEANING THE SAME
US4653568A (en) * 1983-03-17 1987-03-31 Fabraze, Inc. Foundry process and apparatus, including mixing investment composition under vacuum

Also Published As

Publication number Publication date
EP0358120A3 (en) 1992-03-18
DE58909688D1 (en) 1996-07-18
ATE139158T1 (en) 1996-06-15
CH675369A5 (en) 1990-09-28
EP0358120A2 (en) 1990-03-14

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