EP0576922A1 - Process and apparatus for regenerating foundry sand - Google Patents
Process and apparatus for regenerating foundry sand Download PDFInfo
- Publication number
- EP0576922A1 EP0576922A1 EP93109653A EP93109653A EP0576922A1 EP 0576922 A1 EP0576922 A1 EP 0576922A1 EP 93109653 A EP93109653 A EP 93109653A EP 93109653 A EP93109653 A EP 93109653A EP 0576922 A1 EP0576922 A1 EP 0576922A1
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- EP
- European Patent Office
- Prior art keywords
- drum
- sand
- rotor
- speed
- regeneration
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- 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
- B22C5/10—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by dust separating
-
- 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
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- 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 for the regeneration of foundry sand as described in the preamble of claim 1 and a device required to carry out the method.
- DE 29 09 408 C2 has made known a batchwise drum for the regeneration of used sand, by means of which, however, no complete regeneration is achieved with the longest possible process cycle.
- the object of the present invention is to provide a method and a device of the type mentioned at the outset, in which, with a shortening of the process cycle, a better regenerate yield and less destruction of the quartz grain is achieved.
- the invention relates to a method for the batch-wise treatment of old foundry sand, so that the regenerated sand can be used as core sand in the foundry or can be added to the molding sand cycle as refreshing sand.
- the sand is exposed to a high density of impact, friction and shear forces by rotating impact tools, so that the disruptive particles adhering to the quartz grain surface such as bentonite, dust or organic binder shells are separated.
- the application of force to the quartz grain can be done by speed control of the rotor and / or the drum.
- the speed should be set in such a way that the quartz grain is effectively cleaned, but the quartz grain is not destroyed because the speed is adapted to the surface hardness of the material to be regenerated or the changing liter weight.
- the different grain surface hardness from 3 to 7 can be taken into account within the regeneration cycle and a gentle but effective cleaning of the grain surface can be achieved.
- the volume flow of the suction can be changed during the process cycle. This can make them different over time Dust is discharged, but intact quartz grains are retained.
- Formal sand can be added until the increase in the liter weight of the sand in the drum is a maximum of 10% above the starting liter weight.
- the method is suitable for post-treating an at least partially thermally pretreated foundry sand, since the thermal treatment embrittles both clay-bound and organically bound binder casings, but still adheres at least partially to the quartz grain surface.
- This surface can also be cleaned by the impact of impact, gravity and friction, so that the loss on ignition is less than 0.2%. This increases the strength of the cores made with regenerated material.
- Another advantage of the device is the opening and emptying mechanism, which allows the drum to be emptied during operation. This leads to shortened cycle times and thus to a higher economic efficiency of the plant.
- a further advantage is the targeted suctioning off of the starch obtained during the regeneration in such a way that the dusts are recorded separately in their temporally different composition and are sent to a suitable internal or external utilization or disposal.
- the properties of new foundry sand can also be improved by the action of impact, shear and / or frictional forces.
- the surfaces of this natural product are smoothed by the gentle influence of these forces. This reduces the amount of binder used for core production in the core making shop. This is an economic as well as an environmental advantage, since the organic binders entail an exhaust air pollution.
- the invention also relates to suction parallel to the central axis of the drum and the circulating sand stream, as a result of which a large cross-sectional area can be achieved with a low suction speed.
- the shown batch-wise regeneration device consists of two main assemblies of the drum 1 and the rotor 2 as follows.
- the drum 1 consists essentially of a support structure 3 with an integrated consisting of two drum halves 10, 20 Drum, with at least one drum half 20 being axially displaceable, and the suction cone 30.
- the bearing journals 40 and 50 are arranged on the end faces of drum half 10 and suction cone 30, so that the drum can rotate about the lying longitudinal axis.
- the two drum journals are supported in spherical roller bearings 60 and 70. This compensates for misalignments between the drum and its spigot.
- the bearing on the drive side 60 is installed as a fixed bearing and that on the sand inlet side 70 as a floating bearing.
- the bearing pin 40 is designed as a hollow shaft and is provided with an air vane ring 80 as an air inlet into the drum.
- the drum bearings are supported and fastened on the machine frame 3.
- the drum is driven by an electric motor.
- the drum speed is infinitely adjustable via a frequency converter.
- a sand inlet 90 with suction nozzle 100 for air is centrally inserted and sealed in the suction cone 30.
- the suction nozzle 100 is equipped with control flaps 110 and 120 for controlling the air flow.
- the rotor 2 consists essentially of a fixed support shaft 130 with bearings 140, 150 and a hollow drive shaft with a mounted rotor body 170.
- the rotor body 170 is equipped with a plurality of blow bars 180.
- the blow bars 180 are preferably provided with a clamping ring so that they can be replaced easily.
- the rotor is driven by an electric motor.
- the rotor speed is infinitely adjustable via a frequency converter.
- the foundry sand to be regenerated is admitted into the regeneration drum by a metering device 190 via the sand inlet 90 while the drum is running.
- the air flow flowing through the air vane ring 80 is additionally swirled by the running rotor and carries the scrapped valuable materials further to the separator via the suction cone 30 and suction nozzle 100.
- the drum is emptied while the drum is running.
- the axially displaceable drum half 20 is pulled away from the axially non-displaceable drum half 10 on its own guides, specifically in such a way that an outlet gap for the regenerate is formed between the two drum halves.
- the drum halves are designed in such a way that the circumference of the vertical cross section of the drum half facing the center of the drum is larger than the circumference of the vertical cross section lying on the outside of the drum.
- the resulting inclination of the drum shell surface ensures that the sand is discharged when the drum halves are separated.
- the finished regenerate is released from the regeneration drum.
- the seal halves between the two drum halves are cleaned with air nozzles 200.
- the regeneration drum is then closed again.
- the drum is now ready to process the next batch.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
- Centrifugal Separators (AREA)
- Casting Devices For Molds (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Regenerierung von Giesserei-Sand wie es im Oberbegriff von Anspruch 1 beschrieben ist und eine zur Durchführung des Verfahrens erforderliche Einrichtung.The invention relates to a method for the regeneration of foundry sand as described in the preamble of claim 1 and a device required to carry out the method.
Durch die Schrift DE 36 42 916 C2 ist ein Verfahren der eingangs genannten Art bekanntgeworden, bei welchem die bentonithaltigen Fraktion noch verworfen werden muss.A method of the type mentioned at the outset has become known from the document DE 36 42 916 C2, in which the bentonite-containing fraction still has to be discarded.
Durch die DE 29 09 408 C2 ist eine chargenweise Trommel für die Regenerierung von Altsand bekanntgeworden, mittels welcher jedoch keine vollständige Regenerierung bei noch so langem Prozess-Zyklus erreicht wird.DE 29 09 408 C2 has made known a batchwise drum for the regeneration of used sand, by means of which, however, no complete regeneration is achieved with the longest possible process cycle.
Aufgabe der vorliegenden Erfindung ist die Schaffung eines Verfahrens und einer Einrichtung der eingangs genannten Art, bei welchem bzw. welcher bei einer Verkürzung des Prozess-Zyklus ein besserer Regenerat-Ertrag und geringeres Zerstören des Quarzkornes erreicht wird.The object of the present invention is to provide a method and a device of the type mentioned at the outset, in which, with a shortening of the process cycle, a better regenerate yield and less destruction of the quartz grain is achieved.
Erfindungsgemäss wird diese Aufgabe durch die kennzeichnenden Merkmale des Verfahrensanspruchs 1 und des Einrichtungs-Anspruchs 4 gelöst.According to the invention, this object is achieved by the characterizing features of method claim 1 and device claim 4.
Vorteilhafte Ausbildungen des Verfahrens und der Einrichtung sind in den abhängigen Ansprüchen gekennzeichnet.Advantageous embodiments of the method and the device are characterized in the dependent claims.
Die Erfindung bezieht sich auf ein Verfahren zum chargenweise Behandeln von Giesserei-Altsand, sodass der regenierte Sand als Kernsand in der Giesserei eingesetzt werden kann bzw. als Auffrischsand in den Formsandkreislauf gegeben werden kann.The invention relates to a method for the batch-wise treatment of old foundry sand, so that the regenerated sand can be used as core sand in the foundry or can be added to the molding sand cycle as refreshing sand.
Der Sand wird dazu chargenweise durch umlaufende Schlagwerkzeuge einer hohen Dichte von Schlag-, Reibungs- und Scherkräften ausgesetzt, sodass die störenden, auf der Quarzkornoberfläche anhaftenden Partikel wie Bentonit, Staub oder organische Binderhüllen abgetrennt werden.For this purpose, the sand is exposed to a high density of impact, friction and shear forces by rotating impact tools, so that the disruptive particles adhering to the quartz grain surface such as bentonite, dust or organic binder shells are separated.
Die Dosierung der Kraftaufbringung auf das Quarzkorn kann durch eine Drehzahlsteuerung des Rotors und/oder der Trommel erfolgen. Die Drehzahl ist jeweils so einzustellen, dass das Quarzkorn wirkungsvoll abgereinigt wird, eine Zerstörung des Quarzkornes aber nicht stattfindet, da die Drehzahl der Oberflächenhärte des zu regenerierenden Gutes bzw. dem sich ändernden Litergewicht angepasst ist.The application of force to the quartz grain can be done by speed control of the rotor and / or the drum. The speed should be set in such a way that the quartz grain is effectively cleaned, but the quartz grain is not destroyed because the speed is adapted to the surface hardness of the material to be regenerated or the changing liter weight.
Durch während des Regenerierungsprozesses verschiedenartig gefahrene Drehzahlen des Rotors und/oder der Trommel kann die unterschiedliche Kornoberflächenhärte von 3 bis 7 (nach Mohs) innerhalb des Regenrierungszyklusses berücksichtigt und eine schonende aber wirkungsvolle Abreinigung der Kornoberfläche erreicht werden.Due to different speeds of the rotor and / or the drum during the regeneration process, the different grain surface hardness from 3 to 7 (according to Mohs) can be taken into account within the regeneration cycle and a gentle but effective cleaning of the grain surface can be achieved.
Für eine möglichst kurze Prozessdauer ist ein weitgehend gleichbleibendes Chargenvolumen erforderlich. Durch Nachfüllen mit Formaltsand innerhalb der ersten fünf Minuten kann der Volumenverlust in der zu behandelden Charge, der zu Beginn des Regenerierungsprozesses aufgrund des Austrages von leichten, tonigen Bestandteilen stattfindet, ausgeglichen werden.For the shortest possible process duration, a largely constant batch volume is required. The volume loss in the batch to be treated, which occurs at the beginning of the regeneration process due to the discharge of light, clayey constituents, can be compensated for by refilling with formal sand within the first five minutes.
Während des Prozesszyklus kann der Volumenstrom der Absaugung geändert werden. Dadurch kann die im Zeitverlauf unterschiedliche Staubentwicklung ausgetragen werden, intakte Quarzkörner bleiben jedoch erhalten.The volume flow of the suction can be changed during the process cycle. This can make them different over time Dust is discharged, but intact quartz grains are retained.
Die Zugabe von Formaltsand kann solange erfolgen, bis die Zunahme des Litergewichtes des in der Trommel befindlichen Sandes maximal 10 % über dem Ausgangslitergewicht liegt.Formal sand can be added until the increase in the liter weight of the sand in the drum is a maximum of 10% above the starting liter weight.
Weiterhin ist das Verfahren geeignet, einen zumindest teilweise thermisch vorbehandelten Giesserei-Sand nachzubehandeln, da durch die thermische Behandlung sowohl tongebundene als auch organisch gebundene Binderhüllen verspröden, aber noch zumindest teilweise an der Quarzkornoberfläche anhaften. Durch Einwirkung von Schlag-, Schwer- und Reibungskräften kann diese Oberfläche ebenfalls abgereinigt werden, sodass der Glühverlust unter 0,2 % liegt. Die Festigkeiten der mit Regenerat hergestellten Kerne werden dadurch gesteigert.Furthermore, the method is suitable for post-treating an at least partially thermally pretreated foundry sand, since the thermal treatment embrittles both clay-bound and organically bound binder casings, but still adheres at least partially to the quartz grain surface. This surface can also be cleaned by the impact of impact, gravity and friction, so that the loss on ignition is less than 0.2%. This increases the strength of the cores made with regenerated material.
Ein weiterer Vorteil der Einrichtung liegt im Öffnungs- und Entleermechanismus, der es erlaubt, im laufenden Betrieb die Trommel zu entleeren. Dies führt zu verkürzten Zykluszeiten und damit zu einer höheren Wirtschaftlichkeit der Anlage.Another advantage of the device is the opening and emptying mechanism, which allows the drum to be emptied during operation. This leads to shortened cycle times and thus to a higher economic efficiency of the plant.
Ein weiterer Vorteil ist das gezielte Absaugen der bei der Regenerierung anfallenden Stärke derart, dass die Stäube in ihrer zeitlichen verschiedenen anfallenden Zusammensetzung getrennt erfasst werden und einer jeweils geeigneten internen oder externen Verwertung bzw. einer Entsorgung zugeführt werden.A further advantage is the targeted suctioning off of the starch obtained during the regeneration in such a way that the dusts are recorded separately in their temporally different composition and are sent to a suitable internal or external utilization or disposal.
Durch variieren der Absauggeschwindigkeit während des Regenerierprozesses kann ebenfalls eine unterschiedliche Konzentration der Inhaltsstoffe gewonnen werden.By varying the suction speed during the regeneration process, a different concentration of the ingredients can also be obtained.
So ist es möglich, die zu Beginn des Regenerierungsprozesses anfallenden Stäube derart aufzufangen, dass der Anteil der darin noch enthaltenen Wertstoffe wie aktiver Bentonit, messbar über den Methylenblauwert und/oder Kohlenstoffträger, messbar über den Glühverlust in einem Massenanteil von 60-80 % des gesamt bis zu diesem Zeitpunkt angefallenen Staubes separat aufzufangen. Dieser Staub kann über einer Befeuchtungseinrichtung wieder dem Formsand des Giessprozesses zugeführt werden.It is thus possible to collect the dusts that occur at the beginning of the regeneration process in such a way that the proportion of the valuable substances still contained therein, such as active bentonite, can be measured, measured via the methylene blue value and / or carbon carrier over the loss on ignition in a mass fraction of 60-80% of the total dust accumulated up to this point. This dust can be returned to the molding sand of the casting process via a moistening device.
Es ist ebenso möglich, am Ende der Regenerierung eine Staubmenge zu erhalten, in der der Anteil an Schadstoffen die für die Deponierung oder externe Verwertung notwendigen Grenzwerte einhält und der nicht einer zusätzlichen, z.B. thermischen Behandlung unterworfen werden muss.It is also possible to obtain a quantity of dust at the end of the regeneration in which the proportion of pollutants complies with the limit values required for landfilling or external recycling and which does not require additional, e.g. must be subjected to thermal treatment.
Durch die Einwirkung von Schlag-, Scher-, und/oder Reibungskräften kann ebenso ein Giesserei-Neusand in seinen Eigenschaften verbessert werden. Durch schonenden Einfluss dieser Kräfte werden die Oberflächen dieses Naturproduktes geglättet. Dadurch werden die zur Kernherstellung in der Kernmacherei eingesetzten Bindermengen verringert. Dies ist ein wirtschaftlicher als auch ein umwelttechnischer Vorteil, da die organischen Binder eine Abluftbelastung mit sich bringen.The properties of new foundry sand can also be improved by the action of impact, shear and / or frictional forces. The surfaces of this natural product are smoothed by the gentle influence of these forces. This reduces the amount of binder used for core production in the core making shop. This is an economic as well as an environmental advantage, since the organic binders entail an exhaust air pollution.
Die Erfindung betrifft ebenso die Absaugung parallel zur Mittelachse der Trommel und des umlaufendenden Sandstromes, wodurch eine grosser Querschnittsfläche mit einer geringen Absauggeschwindigkeit erreicht werden kann.The invention also relates to suction parallel to the central axis of the drum and the circulating sand stream, as a result of which a large cross-sectional area can be achieved with a low suction speed.
Ein Auführungsbeispiel der Erfindung ist in den beiliegenden Zeichnungen dargestellt und nachfolgend beschrieben. Es zeigt:
- Fig. 1
- einen Querschnitt einer Einrichtung zum Regenerieren von Sand.
- Fig. 1
- a cross section of a device for regenerating sand.
Die dargestellte chargenweise arbeitende Regeneriereinrichtung besteht wie folgt aus zwei Haupt-Baugruppen der Trommel 1 und dem Rotor 2.The shown batch-wise regeneration device consists of two main assemblies of the drum 1 and the
Die Trommel 1 besteht im wesentlichen aus einer Tragkonstruktion 3 mit integrierter aus zwei Trommelhälften 10, 20 bestehenden Trommel, wobei mindestens eine Trommelhälfte 20 axial verschiebbar ist, sowie dem Absaugkonus 30.The drum 1 consists essentially of a
An den Stirnseiten von Trommelhälfte 10 und Absaugkonus 30 sind die Lagerzapfen 40 und 50 angeordnet, sodass die Trommel um die liegende Längsachse rotieren kann. Die beiden Trommelzapfen sind in Pendelrollenlagern 60 und 70 abgestützt. Dadurch werden Fluchtfehler zwischen der Trommel und ihren Zapfen ausgeglichen.The bearing
Das Lager auf der Antriebseite 60 ist als Festlager, das auf der Sandeinlaufseite 70 als Loslager eingebaut. Der Lagerzapfen 40 ist als Hohlwelle ausgebildet und als Lufteinlass in die Trommel mit einem Luftschaufelkranz 80 versehen.The bearing on the
Die Trommellagerungen sind auf dem Maschinengestell 3 abgestützt und befestigt.The drum bearings are supported and fastened on the
Der Trommelantrieb erfolgt mit einem Elektromotor. Die Trommeldrehzahl ist über einen Frequenzumformer stufenlos verstellbar.The drum is driven by an electric motor. The drum speed is infinitely adjustable via a frequency converter.
Ein Sandeinlauf 90 mit Absaugstutzen 100 für Luft ist im Absaugkonus 30 zentrisch eingeführt und abgedichtet.A
Der Absaugstutzen 100 ist mit Regelklappen 110 und 120 für die Steuerung des Luftstromes ausgerüstet.The
Der Rotor 2 besteht im wesentlichen aus einer feststehenden Tragwelle 130 mit Lagerungen 140, 150 und einer Antriebs-Hohlwelle mit aufmontiertem Rotorkörper 170. Der Rotorkörper 170 ist mit mehreren Schlagleisten 180 bestückt.The
Die Schlagleisten 180 sind vorzugsweise leicht auswechselbar mit einem Klemmring versehen.The
Der Rotorantrieb erfolgt mit einem Elektromotor. Die Rotordrehzahl ist über einen Frequenzumformer stufenlos verstellbar.The rotor is driven by an electric motor. The rotor speed is infinitely adjustable via a frequency converter.
Der zu regenerierende Giesserei-Sand wird durch eine Dosiervorrichtung 190 über den Sandeinlauf 90 bei laufender Trommel in die Regeneriertrommel eingelassen.The foundry sand to be regenerated is admitted into the regeneration drum by a
Der durch den Luftschaufelkranz 80 durchströmende Luftstrom wird durch den laufenden Rotor noch zusätzlich verwirbelt und trägt die abgescheuerten Wertstoffe über Absaugkonus 30 und Absaugstutzen 100 weiter zum Abscheider.The air flow flowing through the
Die Trommelentleerung erfolgt bei laufender Trommel. Zu diesem Zweck wird die axial verschiebbare Trommelhälfte 20 auf eigenen Führungen von der axial nicht verschiebbaren Trommelhälfte 10 weggezogen und zwar derart, dass zwischen den beiden Trommelhälften ein Auslassspalt für das Regenerat entsteht.The drum is emptied while the drum is running. For this purpose, the axially
Die Trommelhälften sind derart gestaltet, dass der, der Trommelmitte zugewandte Umfang des senkrechten Querschnittes der Trommelhälfte grösser ist als der Umfang des an der Trommelaussenseite liegenden senkrechten Querschnittes.The drum halves are designed in such a way that the circumference of the vertical cross section of the drum half facing the center of the drum is larger than the circumference of the vertical cross section lying on the outside of the drum.
Durch die sich so ergebende Neigung der Trommelmantelfläche ist ein Austragen des Sandes bei getrennten Trommelhälften gewährleistet.The resulting inclination of the drum shell surface ensures that the sand is discharged when the drum halves are separated.
Nach wenigen Umdrehungen wird das fertige Regenerat aus der Regeneriertrommel ausgelassen. Die Dichtungshälften zwischen beiden Trommelhälften werden mit Luftdüsen 200 gereinigt.After a few turns, the finished regenerate is released from the regeneration drum. The seal halves between the two drum halves are cleaned with
Anschliessend wird die Regeneriertrommel wieder geschlossen. Die Trommel ist somit für die Behandlung der nächsten Charge bereit.The regeneration drum is then closed again. The drum is now ready to process the next batch.
Bei dem Entleeren der Trommel kann eine langsamere Drehzahl als beim Regenerierbetrieb gefahren werden.When emptying the drum, a slower speed can be used than in the regeneration mode.
Claims (20)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH2063/92 | 1992-07-01 | ||
CH02063/92A CH687858A5 (en) | 1992-07-01 | 1992-07-01 | Means for regenerating foundry sand. |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0576922A1 true EP0576922A1 (en) | 1994-01-05 |
Family
ID=4225040
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93109653A Withdrawn EP0576922A1 (en) | 1992-07-01 | 1993-06-17 | Process and apparatus for regenerating foundry sand |
Country Status (11)
Country | Link |
---|---|
US (1) | US5433389A (en) |
EP (1) | EP0576922A1 (en) |
JP (1) | JPH0663691A (en) |
KR (1) | KR940001970A (en) |
CN (1) | CN1083753A (en) |
AU (1) | AU4144193A (en) |
BR (1) | BR9302693A (en) |
CA (1) | CA2098980A1 (en) |
CH (1) | CH687858A5 (en) |
CZ (1) | CZ133693A3 (en) |
MX (1) | MX9303934A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0687514A1 (en) * | 1994-06-15 | 1995-12-20 | Georg Fischer Giessereianlagen Ag | Process and apparatus for reclaiming sand |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6076691A (en) * | 1996-08-06 | 2000-06-20 | Mascotech Inc. | Adjustable enclosure and mounting box for a trailer hitch electrical connector |
CN100444987C (en) * | 2006-12-21 | 2008-12-24 | 于彦奇 | Mechanically rubbing resin sand regenerating machine |
JP5435364B2 (en) * | 2010-07-27 | 2014-03-05 | 新東工業株式会社 | Processing method and processing system for harmful substances generated in casting line |
CN102581218B (en) * | 2012-03-28 | 2013-11-06 | 濮阳市龙昊机械有限公司 | Roller combined gyration-type used sand reconditioning system |
WO2014030398A1 (en) * | 2012-08-23 | 2014-02-27 | 新東工業株式会社 | Molding sand regeneration device |
US10239117B2 (en) | 2015-11-27 | 2019-03-26 | Matsushita Industry Corp. | Core sand regeneration system |
CN114713532B (en) * | 2022-04-26 | 2023-02-24 | 山东春冶机械制造有限公司 | Old sand recovery unit |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1289073A (en) * | 1961-05-04 | 1962-03-30 | Kloeckner Humboldt Deutz Ag | Crusher for fine crushing of natural or synthetic materials |
FR2507103A1 (en) * | 1981-06-04 | 1982-12-10 | Kraemer & Grebe Kg | METHOD AND INSTALLATION OF FRAGMENTATION OF A MATERIAL |
GB2241659A (en) * | 1990-03-08 | 1991-09-11 | Fischer Ag Georg | Process for reclaiming used casting sand |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE151879C (en) * | ||||
US3756406A (en) * | 1970-07-14 | 1973-09-04 | Us Agriculture | Grain cleaner |
FR2278424A1 (en) * | 1974-06-10 | 1976-02-13 | Sapic | PROCESS AND APPARATUS FOR MECHANICAL AND PNEUMATIC CLEANING AND DEDUSTING OF A GRANULAR AND / OR PULVERULENT SUBSTANCE |
CH631643A5 (en) * | 1978-04-14 | 1982-08-31 | Fischer Ag Georg | METHOD FOR REGENERATING OLD FOUNDRY SAND AND DEVICE FOR CARRYING OUT THE METHOD AND PRODUCT OF THE METHOD. |
DE3309379A1 (en) * | 1983-03-16 | 1984-09-20 | Hubert Eirich | METHOD FOR REGENERATING FOUNDRY SAND AND DEVICE FOR IMPLEMENTING THE METHOD |
DE3341894C1 (en) * | 1983-11-19 | 1985-03-14 | Bayerische Motoren Werke AG, 8000 München | Device for coring castings by vibrations |
GB8612498D0 (en) * | 1986-05-22 | 1986-07-02 | Mozley R H | Minerals separator |
CH679135A5 (en) * | 1989-12-06 | 1991-12-31 | Fischer Ag Georg |
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1992
- 1992-07-01 CH CH02063/92A patent/CH687858A5/en not_active IP Right Cessation
-
1993
- 1993-06-17 EP EP93109653A patent/EP0576922A1/en not_active Withdrawn
- 1993-06-22 CA CA002098980A patent/CA2098980A1/en not_active Abandoned
- 1993-06-22 AU AU41441/93A patent/AU4144193A/en not_active Abandoned
- 1993-06-24 JP JP5153363A patent/JPH0663691A/en active Pending
- 1993-06-29 BR BR9302693A patent/BR9302693A/en not_active Application Discontinuation
- 1993-06-30 MX MX9303934A patent/MX9303934A/en unknown
- 1993-06-30 US US08/084,939 patent/US5433389A/en not_active Expired - Fee Related
- 1993-07-01 CN CN93109446A patent/CN1083753A/en active Pending
- 1993-07-01 CZ CZ931336A patent/CZ133693A3/en unknown
- 1993-07-01 KR KR1019930012293A patent/KR940001970A/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1289073A (en) * | 1961-05-04 | 1962-03-30 | Kloeckner Humboldt Deutz Ag | Crusher for fine crushing of natural or synthetic materials |
FR2507103A1 (en) * | 1981-06-04 | 1982-12-10 | Kraemer & Grebe Kg | METHOD AND INSTALLATION OF FRAGMENTATION OF A MATERIAL |
GB2241659A (en) * | 1990-03-08 | 1991-09-11 | Fischer Ag Georg | Process for reclaiming used casting sand |
Non-Patent Citations (1)
Title |
---|
DATABASE WPIL Section Ch, Week 8906, Derwent Publications Ltd., London, GB; Class M22, AN 89-043897 [06] * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0687514A1 (en) * | 1994-06-15 | 1995-12-20 | Georg Fischer Giessereianlagen Ag | Process and apparatus for reclaiming sand |
Also Published As
Publication number | Publication date |
---|---|
CZ133693A3 (en) | 1994-01-19 |
BR9302693A (en) | 1994-01-25 |
MX9303934A (en) | 1994-02-28 |
CH687858A5 (en) | 1997-03-14 |
KR940001970A (en) | 1994-02-16 |
CN1083753A (en) | 1994-03-16 |
AU4144193A (en) | 1994-01-06 |
US5433389A (en) | 1995-07-18 |
JPH0663691A (en) | 1994-03-08 |
CA2098980A1 (en) | 1994-01-02 |
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