EP0687514A1 - Process and apparatus for reclaiming sand - Google Patents

Process and apparatus for reclaiming sand Download PDF

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Publication number
EP0687514A1
EP0687514A1 EP95105892A EP95105892A EP0687514A1 EP 0687514 A1 EP0687514 A1 EP 0687514A1 EP 95105892 A EP95105892 A EP 95105892A EP 95105892 A EP95105892 A EP 95105892A EP 0687514 A1 EP0687514 A1 EP 0687514A1
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EP
European Patent Office
Prior art keywords
sand
gap
friction elements
elements
plate
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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.)
Granted
Application number
EP95105892A
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German (de)
French (fr)
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EP0687514B1 (en
Inventor
Christian Renner
Jovo Laskovic
Näf Xaver
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Georg Fischer Giessereianlagen AG
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Georg Fischer Giessereianlagen AG
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Publication of EP0687514A1 publication Critical patent/EP0687514A1/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
    • B22C5/02—Dressing by centrifuging essentially or additionally
    • 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
    • B22C5/18—Plants for preparing mould materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S241/00—Solid material comminution or disintegration
    • Y10S241/10—Foundry sand treatment

Definitions

  • the invention relates to a method and a device for the regeneration of predominantly synthetic resin-bonded foundry sand, but also of thermally stressed bentonite-bonded molding sand for reuse instead of new sand by mechanical separation of the grain from portions of the binding materials.
  • a device has become known (DE 29 09 408 A1), which has a lying, revolving drum and an impact rotor arranged in the interior thereof in the area of a waste sand downflow.
  • the sand is scrubbed by accelerating abruptly when it hits the impact tool and throwing it into the sand curtain or sand sump, whereby an intense grain of grain friction occurs.
  • the disadvantage of this device is that the sand is only regenerated in batches.
  • the object of the present invention is to provide a method and a device in which the grains of sand can be gently cleaned by repeated rubbing and continuous regeneration of the sand is possible.
  • the device should be structurally simple to implement in order to achieve optimal economy.
  • the main advantage of the invention is that the old sand is regenerated by gently rubbing the grains together. There is no impact or impact treatment.
  • the problem-free and maintenance-free process of the regeneration is achieved in that the area of the facility that is at risk of wear is equipped with wear elements.
  • the drive shaft which is designed as a hollow shaft, also serves as an extraction system, through which the worn binder parts and the dust are continuously extracted.
  • the cleaning intensity can be changed by various structural designs of the wearing elements and the cleaning effect is thereby improved.
  • the binder casing which is statically charged by grain to grain friction, is electrically discharged between the cleaning stages on guide elements. This makes it easier to clean the sand.
  • the area of the gap 16 between the plate 7 and the cylinder 9 is shown on an enlarged scale.
  • radial friction elements 20 are arranged on the mutually facing surfaces of the plate 7 and the cylinder 9, radial friction elements 20 are arranged.
  • the friction elements 20 have a crowned cross section. They are connected to the plate 7 or the cylinder 9 interchangeably, for example by a threaded piece 21 and a nut 22.
  • the friction elements 20 are preferably made of a wear-resistant material such as Ceramics, chilled cast iron, hard metal, metal with hard coating, etc. are manufactured. The intensity of the friction can be changed by means of various structural designs of the friction elements 20.
  • the areas at risk of wear are provided with wear protection 23.
  • FIGS. 3 and 4 A further embodiment variant of the gap geometry is shown in FIGS. 3 and 4.
  • the friction elements 20 have a rectangular cross section. They are arranged in such a way that they do not protrude into the gap 16, or do so only insignificantly.
  • the sand to be treated is preferably passed continuously through the sand feed 11 into the cylinder 9 and forms a standing sand column in it, which is torn open in the area of the gap by the rotary movement of the plate 7.
  • a standing sand column in it, which is torn open in the area of the gap by the rotary movement of the plate 7.
  • the centrifugal force drives the sand in this separation plane in the direction of the gap 16.
  • the sand is pressed through the gap 16 in such a way that the geometric design of the gap 16 and the rotary movement of the plate 7 result in a renewed and more intense grain of grain friction.
  • the sand falls out of the gap 16 onto the guide element 8 and onto the guide element 6.
  • the guide element 6 is designed as a cathode.
  • the sand which has a statically charged binder casing due to the friction, is electrically discharged when it hits the guide element 6. This can make the sand more effective be treated further.
  • the sand treated in this way either falls into a further cleaning stage or into the sand removal device 12 and is fed back into the sand circuit via the pipe 14.
  • the dust generated during the grain-to-grain friction and the abraded binder components are continuously extracted through the hollow shaft 10 by means of the suction through openings 17 which are provided in the hollow shaft in the region of the plates 5, 7.
  • the suction is carried out by a weak vacuum.
  • inlet openings 18 are provided, through which a supply of air for the suction is made possible even during the regeneration process.
  • the drive of the plate 5 is designed so that the regeneration units can be operated at different, continuously adjustable speeds.
  • a speed of 300-1500 rpm has proven to be particularly favorable.
  • the device is equipped with a cleaning stage and the sand is circulated through the cleaning stage as often as desired.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Centrifugal Separators (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Regeneration of used foundry sand with synthetic resin and/or thermally affected bentonite bond material, comprises mechanically separating the latter from the granular base material. Used sand is fed into the vessel (9). The rotating receiver vessel (7) produces rubbing between sand grains belonging respectively to the stationary and rotating sand masses in the vessels (9, 7). Sand is conveyed through at least one gap (16) bounded by elements intensifying the rubbing process, by centrifugal forces. Bond shells are electrically unloaded by means of the guide elements (6). Dust is continuously sucked away, while regenerated sand returns to the foundry sand circulation system. <IMAGE>

Description

Die Erfindung betrifft ein verfahren und eine Vorrichtung zur Regenerierung von überwiegend kunstharzgebundenem Giessereialtsand, aber auch von thermisch belastetem bentonitgebundenem Formsand für die Wiederverwendung anstelle von Neusand mittels mechanischer Trennung des Kornes von Anteilen der Bindestoffe.The invention relates to a method and a device for the regeneration of predominantly synthetic resin-bonded foundry sand, but also of thermally stressed bentonite-bonded molding sand for reuse instead of new sand by mechanical separation of the grain from portions of the binding materials.

Hierfür ist eine Vorrichtung bekannt geworden (DE 29 09 408 A1), welche eine liegende, umlaufende Trommel und einen im Innern derselben im Bereich eines Altsand-Fallstromes angeordneten Schlagrotor aufweist. In dieser Vorrichtung wird der Sand gescheuert, indem er beim Auftreffen auf das Schlagwerkzeug schlagartig beschleunigt und in den Sandvorhang, bzw. Sandsumpf geschleudert wird, wodurch eine intensive Korn an Korn Reibung entsteht. Nachteilig ist bei dieser Vorrichtung, dass der Sand nur chargenweise regeneriert wird.For this purpose, a device has become known (DE 29 09 408 A1), which has a lying, revolving drum and an impact rotor arranged in the interior thereof in the area of a waste sand downflow. In this device, the sand is scrubbed by accelerating abruptly when it hits the impact tool and throwing it into the sand curtain or sand sump, whereby an intense grain of grain friction occurs. The disadvantage of this device is that the sand is only regenerated in batches.

Aufgabe der vorliegenden Erfindung ist die Schaffung eines Verfahrens und einer Vorrichtung, bei der die Sandkörner durch wiederholte Reibung schonend gereinigt werden können und eine kontinuierliche Regenerierung des Sandes möglich ist. Die Vorrichtung soll konstruktiv einfach realisierbar sein, um auch zu einer optimalen Wirtschaftlichkeit zu gelangen.The object of the present invention is to provide a method and a device in which the grains of sand can be gently cleaned by repeated rubbing and continuous regeneration of the sand is possible. The device should be structurally simple to implement in order to achieve optimal economy.

Diese Aufgabe wird durch die kennzeichnenden Merkmale von Anspruch 1 gelöst.This object is solved by the characterizing features of claim 1.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen beschrieben.Further advantageous embodiments of the invention are described in the dependent claims.

Der wesentliche Vorteil der Erfindung liegt darin, dass der Altsand durch schonendes Aneinanderreiben der Körner regeneriert wird. Es findet keine Schlag- bzw. Prallbehandlung statt.The main advantage of the invention is that the old sand is regenerated by gently rubbing the grains together. There is no impact or impact treatment.

Durch die konstruktive Auslegung der Einrichtung ist die mehrfache Wiederholung der Korn an Kornreibung einfach realisierbar, indem man mehrere Reinigungsstufen anbringen kann.Due to the constructive design of the device, the repeated repetition of the grain on grain friction can be easily achieved by installing several cleaning stages.

Problemloser und wartungsfreier Ablauf der Regenerierung wird dadurch erzielt, dass verschleissgefährdete Bereich der Einrichtung durch Verschleisselemente ausgestattet ist.The problem-free and maintenance-free process of the regeneration is achieved in that the area of the facility that is at risk of wear is equipped with wear elements.

Die als Hohlwelle ausgebildete Antriebswelle dient gleichzeitig als Absaugung, durch welche die abgeriebenen Binderteile und der Staub fortlaufend abgesaugt werden. Durch verschiedene konstruktive Gestaltungen der Verschleisselemente kann die Reinigungsintensität verändert werden und dadurch wird die Reinigungswirkung verbessert.The drive shaft, which is designed as a hollow shaft, also serves as an extraction system, through which the worn binder parts and the dust are continuously extracted. The cleaning intensity can be changed by various structural designs of the wearing elements and the cleaning effect is thereby improved.

Die durch Korn an Korn Reibung statisch aufgeladene Binderhülle wird zwischen den Reinigungsstufen an Führungselementen elektrisch entladen. Der Sand lässt sich dadurch besser abreinigen.The binder casing, which is statically charged by grain to grain friction, is electrically discharged between the cleaning stages on guide elements. This makes it easier to clean the sand.

Die Erfindung wird nunmehr anhand eines in den beiden Zeichnungen dargestellten Beispieles erläutert.

Fig. 1
zeigt einen Längsschnitt durch die Sandregeneriereinrichtung
Fig. 2
zeigt die Ansicht A von Fig.1 auf den Spalt
Fig. 3
zeigt die Ansicht A von Fig.1 auf den Spalt mit einer weiteren Ausführungsart des Spaltes
Fig. 4
zeigt die Draufsicht von Fig.3 entlang dem Schnitt B-B
In Fig.1 ist eine Sandregeneriereinrichtung zum mechanischen Abreinigen von Sandkörnern, insbesondere von organisch und anorganisch gebundenen Formsanden dargestellt. An einem Gestell 1 ist ein Behälter in Form eines Zylinders 9 angeordnet. Der Zylinder 9 weist einen Deckel 13 auf, an welchem eine Sandzuführung 11 angeordnet ist. An der Innenwandung des Zylinders 9 sind Sandhalteelemente 19 angeordnet, welche ein Rotieren der Sandsäule im Zylinder verhindern. Am Gestell 1 ist ein Leitelement 8 im unteren Bereich des Zylinders 9 angeordnet. Unterhalb des Leitelementes 8 ist ein trichterförmiges Führungselement 6 angeordnet. Im unteren Bereich des Gestelles 1 ist eine Sandabführungseinrichtung 12 in Form eines Trichters ausgebildet, welche in ein Rohr 14 mündet. Durch den Zylinder 9 ist koaxial eine zentrale Antriebswelle 10 angeordnet, welche in einem Absaugungsstutzen 15 endet. Der Absaugungsstutzen 15 ist als kurzes Rohrstück mit einem Anschlussflansch an dessen Ende ausgebildet und dient gleichzeitig als Anschluss an eine Absaugungseinheit. Am unteren Ende der Antriebswelle 10 ist eine Lagerungseinheit 2 angebracht, welche über einen Riementrieb 3 von einem Motor 4 angetrieben wird. Die Antriebswelle 10 ist als Hohlwelle ausgebildet. An dieser Hohlwelle 10 ist ein Teller 7, welcher als Auffangbehälter ausgebildet ist, fest verbunden. Der Teller 7 ist unterhalb des Zylinders 9 angeordnet, wobei der Teller 7 einen bestimmten Abstand zum Zylinder 9 hin aufweist. Somit ergibt sich ein Spalt 16 zwischen Teller 7 und Zylinder 9. Die Spaltbreite ist mittels einer Verstellvorrichtung (24,25) stufenlos einstellbar, wobei die Verstellung vorzugsweise mechanisch betätigt wird.The invention will now be explained with reference to an example shown in the two drawings.
Fig. 1
shows a longitudinal section through the sand regeneration device
Fig. 2
shows the view A of Fig.1 on the gap
Fig. 3
shows the view A of Figure 1 on the gap with a further embodiment of the gap
Fig. 4
shows the top view of Figure 3 along the section BB
1 shows a sand regeneration device for mechanically cleaning sand grains, in particular organically and inorganically bound molding sands. A container in the form of a cylinder 9 is arranged on a frame 1. The cylinder 9 has a cover 13 on which a sand feed 11 is arranged. Sand holding elements 19 are arranged on the inner wall of the cylinder 9 and prevent the sand column from rotating in the cylinder. A guide element 8 is arranged on the frame 1 in the lower region of the cylinder 9. A funnel-shaped guide element 6 is arranged below the guide element 8. In the lower region of the frame 1, a sand discharge device 12 is designed in the form of a funnel, which opens into a tube 14. A central drive shaft 10 is arranged coaxially through the cylinder 9 and ends in a suction nozzle 15. The suction nozzle 15 is designed as a short piece of pipe with a connecting flange at its end and at the same time serves as a connection to a suction unit. At the lower end of the drive shaft 10, a bearing unit 2 is attached, which is driven by a motor 4 via a belt drive 3. The drive shaft 10 is designed as a hollow shaft. A plate 7, which is designed as a collecting container, is firmly connected to this hollow shaft 10. The plate 7 is arranged below the cylinder 9, the plate 7 being at a certain distance from the cylinder 9. This results in a gap 16 between plate 7 and cylinder 9. The gap width is infinitely adjustable by means of an adjusting device (24, 25), the adjustment preferably being actuated mechanically.

In Fig. 2 ist der Bereich des Spaltes 16 zwischen dem Teller 7 und dem Zylinder 9 in vergrössertem Massstab dargestellt. Auf den sich zueinander zeigenden Flächen des Tellers 7 und des Zylinders 9 sind radial Reibelemente 20 angeordnet. In diesem Ausführungsbeispiel weisen die Reibelemente 20 einen balligen Querschnitt auf. Sie sind mit dem Teller 7 bzw. dem Zylinder 9 beispielsweise durch ein Gewindestück 21 und eine Mutter 22 austauschbar verbunden. Wegen erhöhter Verschleissgefährdung sind die Reibelemente 20 vorzugsweise aus einem verschleissfesten Werkstoff wie z.B. Keramik, Hartguss, Hartmetall, Metall mit Hartauftrag, usw. hergestellt. Durch verschiedene konstruktive Gestaltungen der Reibelemente 20 kann die Reibungsintensität verändert werden. Die durch Verschleiss gefährdeten Flächen werden mit einem Verschleissschutz 23 versehen.2, the area of the gap 16 between the plate 7 and the cylinder 9 is shown on an enlarged scale. On the mutually facing surfaces of the plate 7 and the cylinder 9, radial friction elements 20 are arranged. In this exemplary embodiment, the friction elements 20 have a crowned cross section. They are connected to the plate 7 or the cylinder 9 interchangeably, for example by a threaded piece 21 and a nut 22. Because of the increased risk of wear, the friction elements 20 are preferably made of a wear-resistant material such as Ceramics, chilled cast iron, hard metal, metal with hard coating, etc. are manufactured. The intensity of the friction can be changed by means of various structural designs of the friction elements 20. The areas at risk of wear are provided with wear protection 23.

In Fig.3 und Fig.4 wird eine weitere Ausführungsvariante der Spaltgeometrie gezeigt. Die Reibelemente 20 weisen einen rechteckigen Querschnitt auf. Sie sind so angeordnet, dass sie nicht oder nur unwesentlich in den Spalt 16 hineinragen.A further embodiment variant of the gap geometry is shown in FIGS. 3 and 4. The friction elements 20 have a rectangular cross section. They are arranged in such a way that they do not protrude into the gap 16, or do so only insignificantly.

Der zu behandelnde Sand wird vorzugsweise fortlaufend durch die Sandzuführung 11 in den Zylinder 9 geleitet und bildet in diesem eine stehende Sandsäule, die im Bereich des Spaltes durch die Drehbewegung des Tellers 7 aufgerissen wird. In der Trennungsebene zwischen der stehenden Sandsäule und dem sich drehenden Sandanteil auf dem Teller 7 entsteht eine intensive Korn an Korn Reibung. Die Zentrifugalkraft treibt den Sand in dieser Trennungsebene in Richtung Spalt 16. Der Sand wird so durch den Spalt 16 gedrückt, dass durch die geometrische Gestaltung des Spaltes 16 und durch die Drehbewegung des Tellers 7 eine nochmalige und intensivere Korn an Korn Reibung stattfindet. Der Sand fällt aus dem Spalt 16 auf das Leitelement 8 und auf das Führungselement 6. Das Führungselement 6 ist als Kathode ausgebildet. Der Sand, der durch die Reibung eine statisch aufgeladene Binderhülle aufweist, wird beim Auftreffen auf das Führungselement 6 elektrisch entladen. Dadurch kann der Sand wirksamer weiterbehandelt werden. Der so behandelte Sand fällt entweder in eine weitere Reinigungsstufe oder in die Sandabführungseinrichtung 12 und wird dem Sandkreislauf über das Rohr 14 wieder zugeführt. Der bei der Korn an Korn Reibung entstandene Staub und die abgeriebenen Binderanteile werden mit Hilfe der Absaugung durch Öffnungen 17, die in der Hohlwelle im Bereich der Teller 5,7 angebracht sind, fortlaufend durch die Hohlwelle 10 abgesaugt. Die Absaugung erfolgt durch einen schwachen Unterdruck. Im Bereich des Leitelementes 8 sind Einlassöffnungen 18 vorgesehen, durch welche eine Zufuhr von Luft für die Absaugung auch während des Regenerierungsprozesses ermöglicht wird.The sand to be treated is preferably passed continuously through the sand feed 11 into the cylinder 9 and forms a standing sand column in it, which is torn open in the area of the gap by the rotary movement of the plate 7. In the plane of separation between the standing sand column and the rotating sand portion on the plate 7, an intense grain of grain friction occurs. The centrifugal force drives the sand in this separation plane in the direction of the gap 16. The sand is pressed through the gap 16 in such a way that the geometric design of the gap 16 and the rotary movement of the plate 7 result in a renewed and more intense grain of grain friction. The sand falls out of the gap 16 onto the guide element 8 and onto the guide element 6. The guide element 6 is designed as a cathode. The sand, which has a statically charged binder casing due to the friction, is electrically discharged when it hits the guide element 6. This can make the sand more effective be treated further. The sand treated in this way either falls into a further cleaning stage or into the sand removal device 12 and is fed back into the sand circuit via the pipe 14. The dust generated during the grain-to-grain friction and the abraded binder components are continuously extracted through the hollow shaft 10 by means of the suction through openings 17 which are provided in the hollow shaft in the region of the plates 5, 7. The suction is carried out by a weak vacuum. In the area of the guide element 8, inlet openings 18 are provided, through which a supply of air for the suction is made possible even during the regeneration process.

Bei der vorgestellten Einrichtung besteht die Möglichkeit, weitere Reinigungsstufen in Form von Tellern 5 an der Hohlwelle 10 anzubringen. Zu jedem weiteren Teller 5 sind ein Spalt 16, ein Leitelemente 8, ein Führungselemente 6 und Öffnungen 17 in der Hohlwelle 10 angeordnet. Dadurch wird erreicht, dass der Sand bei jeder weiteren Reinigungsstufe erneut mechanisch gereinigt und elektrisch entladen wird. Die Anzahl der Reinigungsstufen ist beliebig wählbar und somit auf unterschiedliche Anforderungen an den zu regenerierenden Sand anpassbar.In the case of the device presented, there is the possibility of attaching further cleaning stages in the form of plates 5 to the hollow shaft 10. A gap 16, a guide element 8, a guide element 6 and openings 17 are arranged in the hollow shaft 10 for each further plate 5. This ensures that the sand is mechanically cleaned and electrically discharged at every further cleaning stage. The number of cleaning stages can be selected as required and can therefore be adapted to different requirements for the sand to be regenerated.

Der Antrieb der Teller 5 ist so konzipiert, dass die Regenerierungseinheiten mit unterschiedlichen, stufenlos verstellbaren Drehzahlen betrieben werden können. Besonders günstig hat sich eine Drehzahl von 300-1500 U/min erwiesen.The drive of the plate 5 is designed so that the regeneration units can be operated at different, continuously adjustable speeds. A speed of 300-1500 rpm has proven to be particularly favorable.

Ein Chargenbetrieb ist mit dieser Vorrichtung möglich. Dabei wird die Vorrichtung mit einer Reinigungsstufe ausgestattet und der Sand beliebig oft im Kreislauf durch die Reinigungsstufe geleitet.Batch operation is possible with this device. The device is equipped with a cleaning stage and the sand is circulated through the cleaning stage as often as desired.

Claims (18)

Verfahren zur Regenerierung von überwiegend kunstharzgebundenem Giessereialtsand und/oder von thermisch belastetem bentonitgebundenem Formsand mittels mechanischer Trennung von Anteilen der Bindestoffe von der körnigen Grundmasse für die Wiederverwendung anstelle von Neusand, gekennzeichnet durch folgende Verfahrensschritte: - Zuführen des Altsandes in einen Behälter (9) - Versetzen eines Auffangbehälters (7) in eine vorgegebene Rotation zwecks Aneinanderreiben der Sandkörner zwischen einem drehenden Anteil Sand auf dem Auffangbehälter (7) und einer stehenden Sandsäule im Behälter (9) - Herausbefördern des Sandes mit Hilfe der Zentrifugalkraft durch mindestens einen Spalt (16), wobei der Sand an Reibelementen (20) vorbeigeführt wird, um die Korn an Korn Reibung zu intensivieren, anschliessend - Elektrisches Entladen der Binderhüllen mittels Führungselementen (6) - Kontinuierliches Absaugen des entstehenden Staubes - Abtransportieren und Zurückführen des regenerierten Sandes in den Giessereisandkreislauf Process for the regeneration of predominantly synthetic resin-bonded foundry sand and / or thermally stressed bentonite-bonded molding sand by means of mechanical separation of parts of the binding materials from the granular matrix for reuse instead of new sand, characterized by the following process steps: - Feeding the old sand into a container (9) - Setting a collecting container (7) in a predetermined rotation for the purpose of rubbing the grains of sand between a rotating portion of sand on the collecting container (7) and a standing sand column in the container (9) - The sand is conveyed out by means of the centrifugal force through at least one gap (16), the sand being guided past friction elements (20) in order to intensify the grain-to-grain friction, then - Electrical unloading of the binder casings using guide elements (6) - Continuous suction of the resulting dust - Removing and returning the regenerated sand to the foundry sand cycle Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Altsand kontinuierlich regeneriert wird.A method according to claim 1, characterized in that the old sand is continuously regenerated. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Altsand chargenweise regeneriert wird.A method according to claim 1, characterized in that the old sand is regenerated in batches. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass alle Verfahrensschritte des Anspruches 1 beliebig oft wiederholbar sind.A method according to claim 1, characterized in that all method steps of claim 1 can be repeated any number of times. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass durch einen Behälter (9) eine sich drehende Antriebswelle (10) mit daran befestigtem Teller (7) verläuft und zwischen Teller und Behälter (9) ein Spalt (16) ausgebildet ist.Device for carrying out the method according to one of claims 1 to 4, characterized in that a rotating drive shaft (10) with a plate (7) attached to it runs through a container (9) and a gap (16 ) is trained. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass auf der Antriebswelle (10) mehrere Teller (5,7) angeordnet sind.Apparatus according to claim 5, characterized in that a plurality of plates (5,7) are arranged on the drive shaft (10). Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass zu jedem Teller ein Spalt (16), Leitelemente (8), Führungselemente (6) und eine Absaugungsvorrichtung angeordnet sind.Apparatus according to claim 6, characterized in that a gap (16), guide elements (8), guide elements (6) and a suction device are arranged for each plate. Vorrichtung nach einem der Ansprüche 5, 6 und 7, dadurch gekennzeichnet, dass die Teller (5,7) als Auffangbehälter ausgebildet sind.Device according to one of claims 5, 6 and 7, characterized in that the plates (5,7) are designed as collecting containers. Vorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die Antriebswelle (10) und die Teller (5,7) mit unterschiedlichen Geschwindigkeiten zueinander drehbar sind.Device according to one of claims 6 to 8, characterized in that the drive shaft (10) and the plate (5,7) can be rotated relative to one another at different speeds. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Binderhüllen an Führungselementen (6) statisch entladen werden.Apparatus according to claim 5, characterized in that the binder sleeves are statically discharged on guide elements (6). Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass im Spalt an Zylinder (9) und Teller (5,7) Reibelemente (20) angeordnet sind.Apparatus according to claim 5, characterized in that friction elements (20) are arranged in the gap on the cylinder (9) and plate (5, 7). Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass die Reibelemente (20) einen beliebigen, vorzugsweise balligen Querschnitt, aufweisen.Apparatus according to claim 11, characterized in that the friction elements (20) have any, preferably crowned cross-section. Vorrichtung nach Anspruch 6 und 7, dadurch gekennzeichnet, dass die Reibelemente (20) beliebig im Spalt (16) angeordnet sind.Device according to claims 6 and 7, characterized in that the friction elements (20) are arranged arbitrarily in the gap (16). Vorrichtung nach Anspruch 12 und 13, dadurch gekennzeichnet, dass die Reibelemente (20) austauschbar angeordnet sind.Device according to claims 12 and 13, characterized in that the friction elements (20) are arranged interchangeably. Vorrichtung nach Anspruch 12, 13 und 14, dadurch gekennzeichnet, dass die Reibelemente (20) vorzugsweise aus einem verschleissarmen Werkstoff wie z.B. Hartguss, Hartstahl, einem Metall mit Hartauftrag, Keramik, usw., hergestellt sind.Device according to claim 12, 13 and 14, characterized in that the friction elements (20) are preferably made of a low-wear material such as e.g. Chilled cast iron, high carbon steel, a metal with hard coating, ceramics, etc., are produced. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Antriebswelle (10) als Hohlwelle ausgebildet ist und zur Entstaubung verwendet wird.Apparatus according to claim 5, characterized in that the drive shaft (10) is designed as a hollow shaft and is used for dedusting. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass eine Zufuhr von Luft für die Absaugung auch während des Regenerierungsprozesses möglich ist.Apparatus according to claim 5, characterized in that a supply of air for the suction is also possible during the regeneration process. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Breite des Spaltes (16) stufenlos durch eine Verstelleinrichtung (24,25) einstellbar ist.Apparatus according to claim 5, characterized in that the width of the gap (16) is continuously adjustable by an adjusting device (24, 25).
EP95105892A 1994-06-15 1995-04-20 Process and apparatus for reclaiming sand Expired - Lifetime EP0687514B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH188594A CH686411A5 (en) 1994-06-15 1994-06-15 Method and device for the regeneration of foundry sand.
CH1885/94 1994-06-15
CH188594 1994-06-15

Publications (2)

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EP0687514A1 true EP0687514A1 (en) 1995-12-20
EP0687514B1 EP0687514B1 (en) 1999-11-17

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EP95105892A Expired - Lifetime EP0687514B1 (en) 1994-06-15 1995-04-20 Process and apparatus for reclaiming sand

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US (1) US5706879A (en)
EP (1) EP0687514B1 (en)
BR (1) BR9502794A (en)
CH (1) CH686411A5 (en)
CZ (1) CZ82795A3 (en)
DE (1) DE59507231D1 (en)
HU (1) HU215811B (en)

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EP1025926A2 (en) * 1999-02-08 2000-08-09 Sintokogio, Ltd. Method and apparatus for reclaiming casting sand
CN105921690A (en) * 2016-05-26 2016-09-07 合肥市田源精铸有限公司 Treatment method for furan resin self-hardening sand
CN105945217A (en) * 2016-05-26 2016-09-21 合肥市田源精铸有限公司 Treatment method of phenolic resin self-hardening sand
CN106001401A (en) * 2016-05-26 2016-10-12 合肥市田源精铸有限公司 Regeneration treatment method for old sand of phenolic resin self-hardening sand
CN106001400A (en) * 2016-05-26 2016-10-12 合肥市田源精铸有限公司 Preparation method of furan resin self-hardening sand
CN106040969A (en) * 2016-05-26 2016-10-26 合肥市田源精铸有限公司 Preparation method for phenolic resin self-hardening sand
CN107597386A (en) * 2017-10-10 2018-01-19 湖州壤之沃生物技术有限公司 A kind of reducing mechanism for bentonite production

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EP1025926A2 (en) * 1999-02-08 2000-08-09 Sintokogio, Ltd. Method and apparatus for reclaiming casting sand
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CN105921690A (en) * 2016-05-26 2016-09-07 合肥市田源精铸有限公司 Treatment method for furan resin self-hardening sand
CN105945217A (en) * 2016-05-26 2016-09-21 合肥市田源精铸有限公司 Treatment method of phenolic resin self-hardening sand
CN106001401A (en) * 2016-05-26 2016-10-12 合肥市田源精铸有限公司 Regeneration treatment method for old sand of phenolic resin self-hardening sand
CN106001400A (en) * 2016-05-26 2016-10-12 合肥市田源精铸有限公司 Preparation method of furan resin self-hardening sand
CN106040969A (en) * 2016-05-26 2016-10-26 合肥市田源精铸有限公司 Preparation method for phenolic resin self-hardening sand
CN107597386A (en) * 2017-10-10 2018-01-19 湖州壤之沃生物技术有限公司 A kind of reducing mechanism for bentonite production
CN107597386B (en) * 2017-10-10 2019-07-09 湖州壤之沃生物技术有限公司 A kind of grinding device for bentonite production

Also Published As

Publication number Publication date
BR9502794A (en) 1996-02-06
US5706879A (en) 1998-01-13
HU9501737D0 (en) 1995-08-28
HUT76771A (en) 1997-11-28
EP0687514B1 (en) 1999-11-17
CZ82795A3 (en) 1996-01-17
CH686411A5 (en) 1996-03-29
HU215811B (en) 1999-02-01
DE59507231D1 (en) 1999-12-23

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