EP0767019B1 - Procédé et dispositif pour la régénération de sable de fonderie - Google Patents

Procédé et dispositif pour la régénération de sable de fonderie Download PDF

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Publication number
EP0767019B1
EP0767019B1 EP96114427A EP96114427A EP0767019B1 EP 0767019 B1 EP0767019 B1 EP 0767019B1 EP 96114427 A EP96114427 A EP 96114427A EP 96114427 A EP96114427 A EP 96114427A EP 0767019 B1 EP0767019 B1 EP 0767019B1
Authority
EP
European Patent Office
Prior art keywords
sand
process according
grains
rotor
fine particles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96114427A
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German (de)
English (en)
Other versions
EP0767019A1 (fr
Inventor
Christian Renner
Jovo Laskovic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Georg Fischer Disa AG
Original Assignee
Georg Fischer Disa AG
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Filing date
Publication date
Application filed by Georg Fischer Disa AG filed Critical Georg Fischer Disa AG
Publication of EP0767019A1 publication Critical patent/EP0767019A1/fr
Application granted granted Critical
Publication of EP0767019B1 publication Critical patent/EP0767019B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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 more or less large proportion of bentonite-bound sand, the grains of sand from the old sand in a treatment room repeatedly accelerated and braked by combined Impact and shear stress plus intense grain of grain friction scrubbed and thereby from the sticking on the grains of sand, usable and still burned binder and additive casings to be freed, dust generated during treatment is separated from the sand.
  • One is also within the scope of the invention device suitable for carrying out the method.
  • the molding sand cycle of a foundry closes the unpacking point with a.
  • the molds are made from bentonite-bonded molding material produced, a mixed sand coincides with this point more or less large proportions of bentonite-bound sand and (various) core sands.
  • This mixture contains in addition mineral sands and synthetic resin binders also aggregates such as bentonite, coal dust, etc., which are exposed to heat partly destroyed, bentonite to a hard and porous layer with deep fire resistance were burned onto the grain. At In the absence of regeneration, this mixture becomes the molding compound again fed, missing aggregates must be replaced.
  • a regeneration process of the type mentioned is from DE-A-2909408 known.
  • the treatment room is rotating Drum formed, inside of which a concentric Rotor axis arranged rotor with a large number of axially parallel
  • the friction bodies rotate. Part of the sandfall stream falls on this rotor and is accelerating the grains subjected to an intense impact shear stress.
  • the previously known method has the disadvantage that the one to be treated Sand flow can be controlled too little exactly what a requires a relatively long duration of treatment.
  • the inventor has the task posed, a method of the type mentioned and a To create device with which the throughput constant quality of the regrind can be improved can.
  • the solution according to the invention leads to Task to split the sand into two falling streams.
  • the grains of the first stream fall on the rotor, where they greatly accelerated and thus an impact shear stress exposed to be thrown into the second downdraft where they due to the intense grain of grain friction in a very short time be slowed down.
  • the falling currents are preferably unequal large, i.e. is the amount of sand falling per unit of time differently.
  • the method according to the invention is in particular for a batchwise process Treatment of the sand suitable.
  • a batch of sand will until the desired regrind quality in the circuit is reached guided.
  • Binding agents and additives become dust. This is preferably suctioned off continuously.
  • a Time-dependent division of the extracted fine parts can be undamaged Parts as a resource (active bentnoite and coal dust) proportionately returned to the molding sand cycle will. This saves expensive raw materials, the amount problematic landfill goods reduced.
  • the extraction system is controlled accordingly the method disclosed in DE-C-4032798.
  • the dust is sucked off in such a fraction that binding agents and additives from the other dusty parts can be obtained separately by the fractional suction of the Dust due to differences in grain size via the suction power and / or a change in the vacuum is controlled and / or during a predetermined time, after which the separated dust-like parts from binders and additives be returned to the from sand cycle.
  • Suitable device is characterized in that in Treatment room a rotor with protruding from the surface of the rotor Rubbers is arranged and the treatment room adjustable Has inlet openings for the sand streams.
  • the first inlet opening directs the downflow to the rotor, the second leads the second downflow at a certain distance the rotor down.
  • One or more are expediently located above the treatment room Sand holder with the inlet openings for the corresponding Outlet openings attached.
  • a dedusting unit with suction line for targeted Extraction of the fine parts including a regrind collection container arranged.
  • the machine can also be used as a 2-stage machine to increase the Cleaning intensity can be built.
  • the machine for the regeneration of foundry sand shows Sand storage container 10 with two outlet openings 12, 14.
  • the storage container (s) 10 are on a treatment room 16 placed in the interior of a rotor 18 with, from the rotor surface 20 protruding, friction bodies 22 is arranged.
  • baffles 26 provided dedusting unit 24 with suction line 28 for the discharge of the fine parts.
  • a collecting container 30 for collecting the dust-free Sand.
  • the collecting container 30 via a conveyor unit 32 with the Reservoir 10 connected.
  • the sand to be regenerated is well prepared (no tubers > 10mm, free of metal parts, water content max. 1%) in batches placed in the reservoir 10.
  • the outlet openings are designed so that a first, through the outlet opening 12 falling partial flow - in the drawing through the fall line shown f1 - falls on the rotor.
  • the through the outlet opening 14 flowing second partial stream falls accordingly Fall line f2, at a distance a from the rotor lateral surface 20 below.
  • the sizes of the outlet openings are adjustable so that the partial flows falling from the outlet openings 12 and 14 differ or are the same size.
  • the system works in batch mode, i.e. a batch of old sand is kept in circulation until the required quality of regrind is reached. The regenerate is then the System removed and a new batch placed.

Landscapes

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

Claims (12)

  1. Procédé de régénération de sable de fonderie usagé, comportant une proportion plus ou moins élevée de sable lié à la bentonite, les grains du sable étant répétitivement accélérés et freinés dans une enceinte de traitement, et récurés, par une sollicitation combinée de percussion et de cisaillement, avec le grain limitrophe, en exploitant le frottement entre grains, et de ce fait débarrassés des enveloppes de liant et d'additif adhérant sur eux, exploitables et brûlés par la cuisson, où, pendant le traitement, les parties fines issues du récurage sont séparées des grains de sable caractérisé en ce que le sable à traiter est subdivisé en deux courants de chute et en ce que les grains d'un premier courant de chute sont accélérés et projetés dans le deuxième courant de chute.
  2. Procédé selon la revendication 1, caractérisé en ce que le premier courant de chute tombe sur un rotor en rotation, équipé de corps d'abrasion, et les grains sont accélérés par ce rotor en provoquant des forces de percussion-cisaillement.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que les courants de chute sont d'ampleur différente ou égale.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'une charge du sable à traiter est mise en circulation, jusqu'à ce que l'on atteigne la qualité souhaitée du produit régénéré.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que les parties fines sont évacuées par aspiration, volontairement et de façon continue.
  6. Procédé selon la revendication 5, caractérisé en ce que les parties fines sont évacuées par aspiration, de manière que les matériaux non endommagés, tels que la bentonite et le support de C (carbone) soient produits séparément des autres parties fines, l'évacuation par aspiration des parties fines étant régulée en se basant sur les différences entre les tailles de grain et/ou sur une modification de la dépression, par le biais de la puissance d'aspiration.
  7. Procédé selon les revendications 5 et 6, caractérisé en ce que le courant de parties fines évacué par aspiration est séparé après une durée de traitement donnée et prédéterminée.
  8. Dispositif pour la mise en, oeuvre du procédé selon l'une des revendications 1 à 7, avec une enceinte de traitement (16), dans laquelle est disposé un rotor (18) équipé de corps de frottement (22) faisant saillie de la surface d'enveloppe (20) du rotor, caractérisé en ce que l'enceinte de traitement (16) présente des ouvertures d'amenée (12, 14) destinées aux courants de chute du sable, en ce que la ligne de chute (f1) d'une ouverture d'amenée (12) tombe sur le rotor (18) et la ligne de chute (f2) de l'autre ouverture d'amenée (14) conduit vers le bas, en passant à une distance (a) par rapport à la surface d'enveloppe du rotor.
  9. Dispositif selon la revendication 8, caractérisé en ce qu'un récipient de stockage de sable (10) pourvu d'ouvertures d'amenée (12, 14) pour les courants de chute, est installé sur l'enceinte de traitement (16).
  10. Dispositif selon les revendications 8 et 9, caractérisé en ce qu'une unité de dépoussiérage (24) équipée d'une conduite, d'évacuation par aspiration (28), est disposée au-dessous de l'enceinte de traitement (16), pour l'évacuation volontaire par aspiration des parties fines.
  11. Dispositif selon l'une des revendications 8 à 10, caractérisé en ce qu'un récipient collecteur de produit régénéré (30) est disposé au-dessous de l'enceinte de traitement (16) et de l'unité de dépoussiérage (24).
  12. Dispositif selon la revendication 11, caractérisé en ce que, dans le but de conserver un fonctionnement en recyclage, le récipient collecteur (30) est relié au récipient de stockage (10) par l'intermédiaire d'une unité de transport (32).
EP96114427A 1995-10-04 1996-09-10 Procédé et dispositif pour la régénération de sable de fonderie Expired - Lifetime EP0767019B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2798/95 1995-10-04
CH02798/95A CH690322A5 (de) 1995-10-04 1995-10-04 Verfahren und Vorrichtung zur Regenerierung von Giesserei-Altsand.

Publications (2)

Publication Number Publication Date
EP0767019A1 EP0767019A1 (fr) 1997-04-09
EP0767019B1 true EP0767019B1 (fr) 1998-11-11

Family

ID=4241828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96114427A Expired - Lifetime EP0767019B1 (fr) 1995-10-04 1996-09-10 Procédé et dispositif pour la régénération de sable de fonderie

Country Status (6)

Country Link
US (1) US5836369A (fr)
EP (1) EP0767019B1 (fr)
BR (1) BR9603996A (fr)
CH (1) CH690322A5 (fr)
DE (1) DE59600805D1 (fr)
HU (1) HUP9602729A3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7207513B2 (en) * 2001-10-18 2007-04-24 Aerosion Ltd. Device and method for comminuting materials
US7530513B2 (en) * 2001-10-18 2009-05-12 Aerosion, Ltd. Apparatus and methodology for comminuting materials
CN103350186B (zh) * 2013-07-05 2015-05-20 玉林市兰科铸造环保设备有限公司 混合型铸造废砂擦洗回收设备

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1280838A (en) * 1916-07-14 1918-10-08 Link Belt Co Sand-beater.
US1611944A (en) * 1925-12-24 1926-12-28 Link Belt Co Sand revivifier
GB376760A (en) * 1931-03-05 1932-07-05 Ernest Feuerheerd Improvements in or relating to apparatus for pulverising or grinding coal and other materials
CH631643A5 (de) * 1978-04-14 1982-08-31 Fischer Ag Georg Verfahren zur regenerierung von giesserei-altsand sowie einrichtung zur durchfuehrung des verfahrens und erzeugnis des verfahrens.
JPS5722843A (en) * 1980-07-15 1982-02-05 Kitagawa Tekkosho:Kk Treatment of waste sand for casting
CH680498A5 (fr) * 1989-11-28 1992-09-15 Fischer Ag Georg
JPH0455038A (ja) * 1990-06-26 1992-02-21 Mazda Motor Corp 鋳型再生砂の再利用方法
DE4022339A1 (de) * 1990-07-13 1992-01-16 Kloeckner Humboldt Deutz Ag Vorrichtung zur oberflaechenabreinigung feinkoernigen gutes mit einsatz von druckluft

Also Published As

Publication number Publication date
EP0767019A1 (fr) 1997-04-09
HU9602729D0 (en) 1996-11-28
CH690322A5 (de) 2000-07-31
HUP9602729A3 (en) 2002-08-28
HUP9602729A2 (hu) 1998-12-28
DE59600805D1 (de) 1998-12-17
US5836369A (en) 1998-11-17
BR9603996A (pt) 1998-06-09

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