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EP0736349B1 - Method and apparatus for the cooling and homogenising of moulding sand - Google Patents

Method and apparatus for the cooling and homogenising of moulding sand Download PDF

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Publication number
EP0736349B1
EP0736349B1 EP96104557A EP96104557A EP0736349B1 EP 0736349 B1 EP0736349 B1 EP 0736349B1 EP 96104557 A EP96104557 A EP 96104557A EP 96104557 A EP96104557 A EP 96104557A EP 0736349 B1 EP0736349 B1 EP 0736349B1
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EP
European Patent Office
Prior art keywords
housing
sand
conveyor
water
reduced pressure
Prior art date
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Expired - Lifetime
Application number
EP96104557A
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German (de)
French (fr)
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EP0736349A2 (en
EP0736349A3 (en
Inventor
Ernst O. Dipl.-Ing. Kruse
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Maschinenfabrik Gustav Eirich GmbH and Co KG
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Maschinenfabrik Gustav Eirich GmbH and Co KG
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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
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying

Definitions

  • DE-A-3 006 552 describes a cooling device in which two containers alternately filled with moistened hot old sand and placed under vacuum. The moisture in the sand evaporates and extracts the heat of vaporization from the sand.
  • a disadvantage of this method is the fact that the intermittent operation has two evacuation containers required and the vacuum in the rather large containers is continuously built up and broken down must become. The energy consumption and space requirements of such a system are therefore very high large.
  • DE-A-2 952 403 describes a molding sand mixer whose mixing space is evacuated during the mixing process, so that heat of vaporization is also removed here becomes.
  • the ratio of the evacuation volume to the amount of sand is also in this method very unfavorable; because here too the vacuum has to be built up and broken down with every mixing cycle become.
  • the normal mixing cycle must also be extended considerably, so that here too Energy and investment costs turn out unfavorable.
  • the hot sand 2 enters the conveyor belt 1 Lock 3.
  • An airtight, switching flap operated by a motor 3.1 directs the sand into the left lock chamber 3.2, which is also driven by a motor operated and airtight closing flap 3.6 is closed below. If the stuffing like that has risen so far that the probe 3.4 is reached, the flap 3.7 closes automatically. Now the pressure compensation valve 25.1 opens for a few seconds. Immediately afterwards, the Flap 3.1 automatically pivoted to the left, so that now the right chamber 3.3 is filled. After switching flap 3.1, the lower flap 3.6 is opened, see above that the sand from the chamber 3.2 in the mixing and conveying device 4 and thus in the evacuated room.
  • the mixing and cooling device 4 consists, for example, of a tubular one Housing 5, in the central axis of which rotates a shaft 7 driven by a motor 6, the is equipped with blades 8 inclined predominantly in the conveying direction.
  • the inlet nozzle 9 probes for detecting the temperature 10 and the residual moisture of the sand 11 are arranged. Temperature and residual moisture are evaluated in a computer, and its result is used to control the control valve 12 for the water supply 13.
  • the water vapor generated by the negative pressure is discharged through the suction nozzle 14 sucked into the condenser 15, which is constantly by a vacuum pump 16 on a Vacuum of 1300 to 2000 Pa (10 to 15 Torr) is maintained.
  • the condensed water 17 is partially returned to the condenser with a circulating pump 18 through a cooler 19 and partially used to moisten the sand.
  • a level probe 20 controls the water level 17.
  • Control valves 12 and 21 control the amount of water required in each case, partly in circulation, partly with fresh water supply from the network.
  • the cooled sand falls into the left chamber 23.2, while the right chamber 23.3 is emptied onto a conveyor belt 24 through the lower flap 23.7. If the probe 23.4 from Sand reached, the lower flap 23.7 closes, the pressure compensation valve 26 opens for some Seconds, and the flap 23.1 swings to the left, so that now the right Chamber 23.3 is filled. Then the pressure compensation valve 26.1 opens first and then the lower flap 23.6 so that the sand falls onto the conveyor belt 24. This lock too works fully automatically in constant change.
  • FIG. 2 there are two mixing and conveying devices intended.
  • the hot sand is moistened in the first mixing and conveying device 27 and homogenized and thus passes through the two-chamber lock 3 in the second mixing and Conveyor 28, which is constantly under vacuum in the manner described above.
  • the Evaporation heat is supplied to the condenser 15 in the manner described above, the condensed water in the cooler is recooled and reused.
  • Fig. 2 have the same parts the same reference numerals as in FIG. 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Description

Bei der Herstellung von Teilen aus Gußeisen werden die Modelle der Gußteile unter hoher` Druck in Sandformen abgeformt, und in die gebildeten Hohlräume wird flüssiges Eisen gegossen. Nach dem Erstarren des Eisens werden die Gußteile der Form entnommen, und der Formsand wird aufbereitet und erneut zur Formherstellung verwendet. Durch die Berührung mit dem flüssigen Metall erhitzt sich der Formsand örtlich sehr stark, so daß vor der Wiederverwendung eine Kühlung unerläßlich ist.In the manufacture of cast iron parts, the models of the cast parts are shown below High pressure is molded in sand molds, and liquid iron becomes in the cavities formed poured. After the iron has solidified, the castings are removed from the mold, and the Molding sand is processed and used again for mold production. By touch with the liquid metal, the molding sand heats up very locally so that it can be reused cooling is essential.

Es sind verschiedene Methoden der Altsandkühlung bekannt.Various methods of cooling used sand are known.

Zu den gebräuchlichsten Verfahren gehört das Auflockern und Durchströmen des Sandes mit Luft. Hierzu sind äußerst großflächige Geräte mit sehr großem Luftdurchsatz erforderlich, um die recht ungleichmäßig erhitzten Sandpartien auf eine brauchbare Temperatur abzukühlen. Die erhitzte Kühlluft ist vor Staub durchsetzt und muß in voluminösen Entstaubungsanlagen gereinigt werden. Hoher Platz- und Energiebedarf bei ungleichmäßiger Abkühlung ist der Nachteil dieses Verfahrens.The most common methods include loosening up and flowing through the Sand with air. For this purpose there are extremely large devices with a very large air flow required to bring the rather unevenly heated sections of sand to a usable temperature cool down. The heated cooling air is permeated with dust and must be voluminous Dedusting systems to be cleaned. High space and energy requirements with uneven Cooling down is the disadvantage of this process.

In der DE-A-3 006 552 wird eine Kühleinrichtung beschrieben, bei der zwei Behälter abwechselnd mit angefeuchtetem heißem Altsand befüllt und unter Vakuum gesetzt werden. Die Feuchtigkeit des Sandes verdampft und entzieht dem Sand die Verdampfungswärme. Nachteilig an diesem Verfahren ist die Tatsache, daß der intermittierende Betrieb zwei Evakuierbehälter erfordert und das Vakuum in den recht großen Behältern laufend auf- und abgebaut werden muß. Der Energieaufwand und Platzbedarf einer solchen Anlage sind deshalb sehr groß.DE-A-3 006 552 describes a cooling device in which two containers alternately filled with moistened hot old sand and placed under vacuum. The moisture in the sand evaporates and extracts the heat of vaporization from the sand. A disadvantage of this method is the fact that the intermittent operation has two evacuation containers required and the vacuum in the rather large containers is continuously built up and broken down must become. The energy consumption and space requirements of such a system are therefore very high large.

In der DE-A-2 952 403 wird ein Formsandmischer beschrieben, dessen Mischraum während des Mischvorganges evakuiert wird, so daß auch hier Verdampfungswärme abgeführt wird. Auch bei diesem Verfahren ist das Verhältnis von Evakuiervolumen zur Sandmenge sehr ungünstig; denn auch hier muß das Vakuum bei jedem Mischzyklus auf- und abgebaut werden. Der normale Mischzyklus muß zudem erheblich verlängert werden, so daß auch hier Energie- und Investitionskosten ungünstig ausfallen.DE-A-2 952 403 describes a molding sand mixer whose mixing space is evacuated during the mixing process, so that heat of vaporization is also removed here becomes. The ratio of the evacuation volume to the amount of sand is also in this method very unfavorable; because here too the vacuum has to be built up and broken down with every mixing cycle become. The normal mixing cycle must also be extended considerably, so that here too Energy and investment costs turn out unfavorable.

In Fig. 8 der DE-B-1 219 182 ist eine Vorrichtung zum Kühlen von Formsand in einen Gehäuse mit einer kontinuierlich arbeitenden Transportschraube gezeigt. In dieser wird der heiße Sand mit Wasser befeuchtet, und im Gehäuse wird ein Unterdruck mit Schleusen am Ein- und Auslauf des Gehäuses aufrechterhalten. "Giesserei" 79 (1992), Nr. 15, Seite 633, Bild 7 zeigt ein Anlageschema für Sandkühlung unter Vakuum, bei dem (bei 4.1) eine Feuchte- und Temperaturmessung staffindet.8 of DE-B-1 219 182 is a device for cooling molding sand into one Shown with a continuously working transport screw. In this the hot sand moistened with water, and in the housing a vacuum with locks on Maintain the inlet and outlet of the housing. "Foundry" 79 (1992), No. 15, page 633, Figure 7 shows a system diagram for sand cooling under vacuum, in which (at 4.1) a moisture and Temperature measurement is included.

Von der DE-B-1 219 182 ausgehend bestand die der Erfindung zugrundeliegende Aufgabe darin, ein Verfahren und eine Vorrichtung zur Kühlung und Homogenisierung von Gießereiformsand mit möglichst gleichbleibender Temperatur und Restfeuchte zu bekommen. Starting from DE-B-1 219 182, the basis of the invention existed The task is to develop a method and a device for cooling and homogenizing To get foundry sand with as constant a temperature and residual moisture as possible.

Diese Aufgabe wird erfindungsgemäß mit dem Verfahren nach Anspruch 1 und der Vorrichtung nach Anspruch 5 gelöst. Bevorzugte Ausführungsformen finden sich in den Unteransprüchen 2 bis 4 und 6 bis 10.This object is achieved with the method according to claim 1 and Device according to claim 5 solved. Preferred embodiments can be found in the Subclaims 2 to 4 and 6 to 10.

Erfindungsgemäß wird der heiße Sand nach Bedarf befeuchtet und kontinuierlich durch das Gerät gefördert. Durch den Mischeffekt der Förderschnecken wird das zugegebene Wasser intensiv mit dem Sand vermischt. Die Misch- und Fördereinrichtung ist ständig unter Vakuum. Das Wasser verdampft und entzieht dem Sand die Verdampfungswärme. Der Dampf wird abgesaugt und kondensiert. Das entstehende Wasser wird zweckmäßig rückgekühlt und wieder zur Befeuchtung des Sandes verwendet. Zur Aufrechterhaltung des Vakuums in der Misch- und Fördereinrichtung sind ihr Zweikammerschleusen vor- und nachgeschaltet. In der Zeichnung bedeuten

Fig. 1
eine schematische Darstellung einer ersten Ausführungsform der Vorrichtung nach der Erfindung und
Fig. 2
eine schematische Darstellung einer zweiten Ausführungsform der Vorrichtung nach der Erfindung.
According to the invention, the hot sand is moistened as required and continuously conveyed through the device. Due to the mixing effect of the screw conveyors, the added water is mixed intensively with the sand. The mixing and conveying device is constantly under vacuum. The water evaporates and extracts the heat of vaporization from the sand. The steam is sucked off and condensed. The resulting water is appropriately recooled and used again to moisten the sand. In order to maintain the vacuum in the mixing and conveying device, two-chamber locks are connected upstream and downstream. Mean in the drawing
Fig. 1
is a schematic representation of a first embodiment of the device according to the invention and
Fig. 2
is a schematic representation of a second embodiment of the device according to the invention.

In der Vorrichtung nach Fig. 1 gelangt von einem Förderband 1 der heiße Sand 2 in die Schleuse 3. Eine luftdicht abschließende, durch einen Motor betriebene Umschaltklappe 3.1 leitet den Sand in die linke Schleusenkammer 3.2, die durch eine ebenfalls durch einen Motor betriebene und luftdicht schließende Klappe 3.6 unten geschlossen ist. Wenn die Füllung so weit angestiegen ist, daß die Sonde 3.4 erreicht ist, schließt die Klappe 3.7 automatisch. Jetzt öffnet für einige Sekunden das Druckausgleichventil 25.1. Unmittelbar danach wird die Klappe 3.1 automatisch nach links geschwenkt, so daß nunmehr die rechte Kammer 3.3 gefüllt wird. Nach dem Umschalten der Klappe 3.1 wird die untere Klappe 3.6 geöffnet, so daß der Sand aus der Kammer 3.2 in die Misch- und Fördereinrichtung 4 und damit in den evakuierten Raum gelangt. Wenn die rechte Kammer 3.3 durch Ansprechen der Sonde 3.5 anzeigt, daß sie gefüllt ist, schließt zunächst die untere Klappe 3.6, dann öffnet kurz das Druckausgleichventil 25, und die Klappe 3.1 schwenkt wieder in die rechte Position, so daß jetzt wieder die linke Kammer 3.2 gefüllt und gleichzeitig die rechte 3.3 nach unten entleert wird.In the device according to FIG. 1, the hot sand 2 enters the conveyor belt 1 Lock 3. An airtight, switching flap operated by a motor 3.1 directs the sand into the left lock chamber 3.2, which is also driven by a motor operated and airtight closing flap 3.6 is closed below. If the stuffing like that has risen so far that the probe 3.4 is reached, the flap 3.7 closes automatically. Now the pressure compensation valve 25.1 opens for a few seconds. Immediately afterwards, the Flap 3.1 automatically pivoted to the left, so that now the right chamber 3.3 is filled. After switching flap 3.1, the lower flap 3.6 is opened, see above that the sand from the chamber 3.2 in the mixing and conveying device 4 and thus in the evacuated room. If the right chamber 3.3 by responding to the probe 3.5 indicates that it is filled, first closes the lower flap 3.6, then briefly opens the Pressure compensation valve 25, and the flap 3.1 swings back into the right position, so that now again filled the left chamber 3.2 and at the same time emptied the right 3.3 downwards becomes.

Durch den oben beschriebenen, sich ständig wiederholenden automatischen Ablauf der Zweikammerschleuse gelangt der heiße Sand in die evakuierte Misch- und Fördereinrichtung 4, wobei in dieser das Vakuum ständig aufrechterhalten wird.Through the above-described, constantly repeating automatic sequence of The hot sand reaches the evacuated mixing and conveying device in a two-chamber lock 4, in which the vacuum is constantly maintained.

Die Misch- und Kühleinrichtung 4 besteht beispielsweise aus einem rohrförmigen Gehäuse 5, in dessen Mittelachse eine von einem Motor 6 angetriebene Welle 7 rotiert, die mit überwiegend in Förderrichtung geneigten Schaufeln 8 bestückt ist. Im Einlaufstutzen 9 sind Sonden zur Erfassung der Temperatur 10 und der Restfeuchte des Sandes 11 angeordnet. Temperatur und Restfeuchte werden in einem Rechner ausgewertet, und dessen Ergebnis wird zur Steuerung des Regelventils 12 für die Wasserzufuhr 13 verwendet.The mixing and cooling device 4 consists, for example, of a tubular one Housing 5, in the central axis of which rotates a shaft 7 driven by a motor 6, the is equipped with blades 8 inclined predominantly in the conveying direction. In the inlet nozzle 9 probes for detecting the temperature 10 and the residual moisture of the sand 11 are arranged. Temperature and residual moisture are evaluated in a computer, and its result is used to control the control valve 12 for the water supply 13.

Der durch den Unterdruck entstehende Wasserdampf wird durch den Absaugstutzen 14 in den Kondensator 15 gesaugt, der ständig durch eine Vakuumpumpe 16 auf einem Unterdruck von 1300 bis 2000 Pa (10 bis 15 Torr) gehalten wird. Das Kondenswasser 17 wird mit einer Umwälzpumpe 18 durch einen Kühler 19 teilweise in den Kondensator zurückgegeben und teilweise zur Befeuchtung des Sandes benutzt. Eine Niveausonde 20 kontrolliert den Wasserstand 17. Regelventile 12 und 21 steuern die jeweils erforderliche Wassermenge, teils im Umlauf, teils mit Frischwasserzufuhr aus dem Netz.The water vapor generated by the negative pressure is discharged through the suction nozzle 14 sucked into the condenser 15, which is constantly by a vacuum pump 16 on a Vacuum of 1300 to 2000 Pa (10 to 15 Torr) is maintained. The condensed water 17 is partially returned to the condenser with a circulating pump 18 through a cooler 19 and partially used to moisten the sand. A level probe 20 controls the water level 17. Control valves 12 and 21 control the amount of water required in each case, partly in circulation, partly with fresh water supply from the network.

Am Ende des Förderrohres 5 befindet sich der Auslaufstutzen 22, an dem eine zweite Zweikammerschleuse 23 luftdicht angeschlossen ist. Diese Schleuse 23 ist baugleich mit der Schleuse 3 am Einlaufstutzen 9.At the end of the delivery pipe 5 there is the outlet connection 22, on which a second Two-chamber lock 23 is connected airtight. This lock 23 is identical to the Lock 3 on the inlet connection 9.

Der gekühlte Sand fällt in die linke Kammer 23.2, während die rechte Kammer 23.3 durch die untere Klappe23.7 auf ein Förderband 24 entleert wird. Wird die Sonde 23.4 vom Sand erreicht, schließt die untere Klappe 23.7, das Druckausgleichventil 26 öffnet für einige Sekunden, und die Umschlagklappe 23.1 schwenkt nach links, so daß jetzt die rechte Kammer 23.3 gefüllt wird. Sodann öffnet zunächst das Druckausgleichventil 26.1 und dann die untere Klappe 23.6, so daß der Sand auf das Förderband 24 fällt. Auch diese Schleuse arbeitet in ständigem Wechsel vollautomatisch.The cooled sand falls into the left chamber 23.2, while the right chamber 23.3 is emptied onto a conveyor belt 24 through the lower flap 23.7. If the probe 23.4 from Sand reached, the lower flap 23.7 closes, the pressure compensation valve 26 opens for some Seconds, and the flap 23.1 swings to the left, so that now the right Chamber 23.3 is filled. Then the pressure compensation valve 26.1 opens first and then the lower flap 23.6 so that the sand falls onto the conveyor belt 24. This lock too works fully automatically in constant change.

Bei der Ausführungsform gemäß Fig. 2 sind zwei Misch- und Fördereinrichtungen vorgesehen. In der ersten Misch- und Fördereinrichtung 27 wird der heiße Sand befeuchtet und homogenisiert und gelangt so durch die Zweikammerschleuse 3 in die zweite Misch- und Fördereinrichtung 28, die in der oben beschriebenen Weise ständig unter Vakuum steht. Die Verdampfungswärme wird dem Kondensator 15 in der oben beschriebenen Weise zugeführt, das Kondenswasser im Kühler rückgekühlt und wiederverwendet. In Fig. 2 haben gleiche Teile die gleichen Bezugszeichen wie in Fig. 1.In the embodiment according to FIG. 2 there are two mixing and conveying devices intended. The hot sand is moistened in the first mixing and conveying device 27 and homogenized and thus passes through the two-chamber lock 3 in the second mixing and Conveyor 28, which is constantly under vacuum in the manner described above. The Evaporation heat is supplied to the condenser 15 in the manner described above, the condensed water in the cooler is recooled and reused. In Fig. 2 have the same parts the same reference numerals as in FIG. 1.

Das erfindungsgemäße Verfahren zeichnet sich aus durch

  • 1. bedarfsgerechte Befeuchtung,
  • 2. intensives Homogenisieren des ungleichmäßig erhitzten Sandes mit dem Wasser,
  • 3. geringes Totvolumen der zu evakuierenden Räume,
  • 4. geringen Energieverbrauch,
  • 5. geringen Platzbedarf und
  • 6. gleichmäßige Temperatur und Restfeuchte des gekühlten Sandes.
    • The method according to the invention is characterized by
  • 1. humidification as required,
  • 2. intensive homogenization of the unevenly heated sand with the water,
  • 3. low dead volume of the rooms to be evacuated,
  • 4. low energy consumption,
  • 5. small footprint and
  • 6. uniform temperature and residual moisture of the cooled sand.

    • Claims (10)

    1. A method of cooling and homogenising foundry moulding sand in a housing with a continuously operating conveyor apparatus (4), in which the hot sand is moistened with water, a reduced pressure is continually held in the housing and lock assemblies (3, 23) operating at the intake and discharge of the housing ensure the maintenance of the reduced pressure which is generated by a vacuum pump (16), characterised in that a conveyor; apparatus which is at the same time in the form of a mixer is used, and the feed of water is regulated by means of at least one temperature probe (10) and at least one moisture probe (11) in the intake `region of the housing by way of a computer in order to obtain a uniform temperature and residual moisture content.
    2. A method according to claim 1 characterised in that the water vapour is condensed to water (17) again in a condenser (15), and that water is cooled down again and used again for moistening the sand.
    3. A method according to one of claims 1 and 2 characterised in that the reduced pressure in the mixing and conveyor apparatus (4) is held at 1300 to 2000 Pa (10 to 15 Torr).
    4. A method according to one of claims 1 to 3 characterised in that two housings with mixing and conveyor apparatuses are used, wherein the sand is moistened and homogenised in the first housing and is cooled in the second housing under a reduced pressure and with dissipation of the heat of vaporisation.
    5. Apparatus for cooling and homogenising foundry moulding sand having a housing with a continuously operating conveyor apparatus (4) and lock assemblies (3, 23) at the intake and discharge of the housing, which ensure the maintenance of a reduced pressure, characterised in that the conveyor apparatus is at the same time in the form of a mixer and there is provided a water feed (12, 13) which is regulatable by means of at least one temperature probe (10) and at least one moisture probe (11) in the intake region of the housing by way of a computer.
    6. Apparatus according to claim 5 characterised in that the mixing and conveyor apparatus has a shaft with vanes which are inclined predominantly in the conveyor direction.
    7. Apparatus according to one of claims 5 and 6 characterised in that there are provided two two-chamber lock assemblies (3, 23) each having a respective change-over switching flap (3.1, 23.1) and two respective discharge flaps (3.6, 3.7, 23.6, 23.7).
    8. Apparatus according to one of claims 5 to 7 characterised in that filling level probes (3.4, 3.5, 23.4, 23.5) are provided at the lock assemblies (3, 23) for measuring the height of filling with sand.
    9. Apparatus according to one of claims 5 to 8 characterised in that pressure compensation valves (25, 25.1, 26, 26.1) are provided at the lock assemblies (3, 23).
    10. Apparatus according to one of claims 5 to 9 characterised in that there are provided two housings with mixing and conveyor apparatuses, wherein the sand is moistened and homogenised in the first housing and is cooled in the second housing under a reduced pressure and with dissipation of the heat of vaporisation.
    EP96104557A 1995-04-04 1996-03-22 Method and apparatus for the cooling and homogenising of moulding sand Expired - Lifetime EP0736349B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19512593A DE19512593A1 (en) 1995-04-04 1995-04-04 Method and device for cooling foundry sand
    DE19512593 1995-04-04

    Publications (3)

    Publication Number Publication Date
    EP0736349A2 EP0736349A2 (en) 1996-10-09
    EP0736349A3 EP0736349A3 (en) 1997-05-07
    EP0736349B1 true EP0736349B1 (en) 1999-07-28

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    US (1) US5915833A (en)
    EP (1) EP0736349B1 (en)
    JP (1) JP4055830B2 (en)
    CZ (1) CZ294324B6 (en)
    DE (2) DE19512593A1 (en)
    DK (1) DK0736349T3 (en)
    ES (1) ES2133858T3 (en)
    IN (1) IN187705B (en)
    PL (1) PL180654B1 (en)
    RU (1) RU2137569C1 (en)

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    WO2001021341A1 (en) * 1999-09-23 2001-03-29 Maschinenfabrik Gustav Eirich Method for conditioning foundry moulding sand and a device therefor
    DE19958591A1 (en) * 1999-12-06 2001-06-07 Fischer Georg Disa Eng Ag Processing and transporting sand in casting plant comprises transporting sand between plant parts in containers having sand volume for at least one casting mold
    WO2002074467A1 (en) 2001-03-20 2002-09-26 Nv Engineering Gmbh Method and device for the cooling preparation of warm bulk materials

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    DE10030675A1 (en) * 2000-06-23 2002-01-03 Eirich Maschf Gustav Method and device for processing molding sand
    RU2249503C1 (en) * 2003-06-27 2005-04-10 САВВАТЕЕВ Алексей Дмитриевич Concrete mixture preparing method
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    DE102014117509A1 (en) * 2014-11-28 2016-06-02 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Device for processing and cooling foundry sand
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    PL3862157T3 (en) * 2020-02-04 2023-05-02 I.C.M. S.R.L. Method and plant for cooling a mixture of concrete ingredients
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    US2585739A (en) * 1950-03-29 1952-02-12 Joseph D Christian Cooling off of sand and gravel
    DE1219182B (en) * 1963-08-23 1966-06-16 Ubbink Gieterij N V Method and device for cooling molding sand
    CA1096132A (en) * 1977-01-21 1981-02-24 Albert Musschoot Method and apparatus for reclaiming foundry sand
    US4252001A (en) * 1977-01-21 1981-02-24 Musschoot A Method and apparatus for cooling foundry sand
    US4611469A (en) * 1977-01-21 1986-09-16 General Kinematics Method and apparatus for cooling foundry sand
    US4361405A (en) * 1980-12-18 1982-11-30 Alfelder Maschinen-Und Modell-Fabrik Kunkel, Wagner & Co. K.G. Method and apparatus for preparing, more particularly for the cooling and mixing of moulding sand
    JPS60151650U (en) * 1985-02-02 1985-10-08 株式会社　喜多村合金製作所 Rapid dehumidification drying equipment for foundry sand
    DE4109136C2 (en) * 1990-03-20 1994-01-13 Kuettner Gmbh & Co Kg Dr Method and device for processing contaminated waste
    DE4224438A1 (en) * 1991-10-19 1993-04-22 Hans Martin Koopmann Apparatus for regeneration of foundry sand - with individual units coupled together according to sand type etc., for mechanical, thermal, chemical and wet regeneration processes
    JP2982629B2 (en) * 1994-09-30 1999-11-29 マツダ株式会社 Method and apparatus for adjusting kneading of foundry sand

    Cited By (4)

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    Publication number Priority date Publication date Assignee Title
    WO2001021341A1 (en) * 1999-09-23 2001-03-29 Maschinenfabrik Gustav Eirich Method for conditioning foundry moulding sand and a device therefor
    US6926063B1 (en) * 1999-09-23 2005-08-09 Maschinenfabrik Gustav Eirich Method for conditioning foundry moulding sand and a device therefor
    DE19958591A1 (en) * 1999-12-06 2001-06-07 Fischer Georg Disa Eng Ag Processing and transporting sand in casting plant comprises transporting sand between plant parts in containers having sand volume for at least one casting mold
    WO2002074467A1 (en) 2001-03-20 2002-09-26 Nv Engineering Gmbh Method and device for the cooling preparation of warm bulk materials

    Also Published As

    Publication number Publication date
    DK0736349T3 (en) 1999-11-29
    RU2137569C1 (en) 1999-09-20
    JPH08300098A (en) 1996-11-19
    CZ97596A3 (en) 1996-10-16
    PL313611A1 (en) 1996-10-14
    US5915833A (en) 1999-06-29
    CZ294324B6 (en) 2004-11-10
    EP0736349A2 (en) 1996-10-09
    IN187705B (en) 2002-06-08
    DE59602512D1 (en) 1999-09-02
    JP4055830B2 (en) 2008-03-05
    DE19512593A1 (en) 1996-10-10
    ES2133858T3 (en) 1999-09-16
    EP0736349A3 (en) 1997-05-07
    PL180654B1 (en) 2001-03-30

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