EP0767019A1 - 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
EP0767019A1
EP0767019A1 EP96114427A EP96114427A EP0767019A1 EP 0767019 A1 EP0767019 A1 EP 0767019A1 EP 96114427 A EP96114427 A EP 96114427A EP 96114427 A EP96114427 A EP 96114427A EP 0767019 A1 EP0767019 A1 EP 0767019A1
Authority
EP
European Patent Office
Prior art keywords
sand
falling
treatment room
rotor
grains
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.)
Granted
Application number
EP96114427A
Other languages
German (de)
English (en)
Other versions
EP0767019B1 (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
Priority date (The priority date 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 date listed.)
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 process for the regeneration of sand with a more or less large amount of bentonite-bound sand, the sand grains of the old sand being repeatedly accelerated and decelerated in a treatment room, scrubbed by combined impact and shear stress plus intense grain of grain friction and thereby from the sand grains adherent, usable and burnt-off binder and additive casings are freed, whereby dust generated during the treatment is separated from the sand.
  • a device suitable for carrying out the method also lies within the scope of the invention.
  • the molding sand cycle of a foundry includes the unpacking point. If the molds are made from bentonite-bound molding material, mixed sand with more or less large proportions of bentonite-bound sand and (various) core sands is obtained at this point. In addition to mineral sands and synthetic resin binders, this mixture also contains additives such as bentonite, coal dust, etc., which were partially destroyed under the influence of heat, and bentonite was burned onto the grain to form a hard and porous layer with a low fire resistance. In the absence of regeneration, this mixture is used again for the molding compound supplied, missing aggregates must be replaced.
  • old sand When old sand is regenerated, the sand grains are freed from the binder and additive shells.
  • the old sand regenerated in this way largely achieves the properties of new quartz sand and can therefore be reused instead of new sand.
  • a regeneration method of the type mentioned at the outset is known from DE-A-2909408.
  • the treatment room is formed by a rotating drum, in the interior of which rotates a rotor arranged concentrically to the drum axis with a large number of axially parallel friction bodies. Part of the sandfall stream falls on this rotor and is subjected to an intensive impact shear stress when the grains accelerate.
  • the previously known method has the disadvantage that the sand stream to be treated cannot be controlled precisely enough, which necessitates a relatively long treatment time.
  • the inventor has set himself the task of creating a method of the type mentioned at the beginning and a device by means of which the throughput performance can be improved while the quality of the regenerate remains the same.
  • the solution of the task according to the invention leads to the sand being divided into two falling streams.
  • the grains of the first stream fall onto the rotor, where they are strongly accelerated and thus subjected to impact shear stress and are thrown into the second falling stream, where they are braked in a very short time by the intense grain of grain friction.
  • the falling currents are preferably unequal, i.e. the amount of sand falling per unit of time varies.
  • the method according to the invention is particularly suitable for batch-wise treatment of the sand.
  • a batch of sand will until the desired regrind quality is achieved.
  • the shell of the still good and damaged binders and additives that has been rubbed off by the grains becomes dust. This is preferably suctioned off continuously. Through a time-dependent division of the extracted fine parts, undestroyed parts can be returned to the molding sand cycle proportionately as a valuable substance (active bentnoite and coal dust). This saves expensive raw materials and reduces the amount of problematic landfills.
  • the suction is controlled in accordance with the method disclosed in DE-C-4032798.
  • the dust is extracted in a fractional manner in such a way that binders and additives are obtained separately from the other dusty proportions by controlling the fractional suction of the dust on the basis of differences in grain size via the suction power and / or a change in the vacuum and / or for a predetermined time , after which the separated dust-like portions of binders and additives are returned to the from sand cycle.
  • a device which is particularly suitable for carrying out the method according to the invention is characterized in that a rotor with friction bodies projecting from the rotor jacket surface is arranged in the treatment room and the treatment room has adjustable inlet openings for the sandfall flows.
  • the first inlet opening directs the downflow to the rotor, the second directs the 2nd downflow at a certain distance in front of the rotor.
  • One or more sand containers with the inlet openings for the corresponding outlet openings are expediently arranged above the treatment room.
  • a dedusting unit with suction line for targeted Extraction of the fine parts including a regrind collection container.
  • this collecting container is connected to the storage container above the treatment room by means of a conveyor unit.
  • the machine can also be built as a 2-stage machine to increase the cleaning intensity.
  • the machine for regenerating old foundry sand has sand storage containers 10 with two outlet openings 12, 14.
  • the storage container (s) 10 are placed on a treatment room 16, in the interior of which a rotor 18 with friction bodies 22, which protrude from the rotor jacket surface 20, is arranged.
  • a collection container 30 is connected to the dedusting unit 24 for collecting the dedusted sand. To close the sand cycle in the machine, the collecting container 30 is connected to the storage container 10 via a conveyor unit 32.
  • the sand to be regenerated is well prepared (no tubers> 10mm, free of metal parts, water content max. 1%) in batches 10.
  • the outlet openings are designed in such a way that a first partial stream falling through the outlet opening 12 - shown in the drawing by the fall line f1 - falls on the rotor.
  • the second partial flow flowing through the outlet opening 14 falls according to the fall line f2, at a distance a from the rotor lateral surface 20.
  • the sizes of the outlet openings can be adjusted so that the partial flows falling out of the outlet openings 12 and 14 are different or the same size.
  • the sand grains falling on it from the first partial flow from the outlet opening 12 are grasped, accelerated and thereby subjected to impact frictional forces.
  • the grains are then thrown at high speed into the loosely falling partial stream from outlet opening 14 and are braked in this in a very short time by intensive grain of grain friction.
  • the binder cover is rubbed off and, as a side effect, existing sharp edges on the grains are rounded.
  • the system works in batch mode, i.e. a batch of used sand is circulated until the required quality of regrind is achieved. The regenerate is then removed from the system and a new batch is placed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
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 true EP0767019A1 (fr) 1997-04-09
EP0767019B1 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103350186A (zh) * 2013-07-05 2013-10-16 广西玉林玉柴工业化工有限公司 混合型铸造废砂擦洗回收设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7530513B2 (en) * 2001-10-18 2009-05-12 Aerosion, Ltd. Apparatus and methodology for comminuting materials
US7207513B2 (en) * 2001-10-18 2007-04-24 Aerosion Ltd. Device and method for comminuting materials

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2909408A1 (de) * 1978-04-14 1979-10-18 Fischer Ag Georg Verfahren zur regenerierung von giesserei-altsand sowie regenerier-einrichtung und erzeugnis
DE4032798A1 (de) * 1989-11-28 1991-05-29 Fischer Ag Georg Verfahren zur regenerierbehandlung von ueberwiegend tongebundenem giesserei-altsand
DE4022339A1 (de) * 1990-07-13 1992-01-16 Kloeckner Humboldt Deutz Ag Vorrichtung zur oberflaechenabreinigung feinkoernigen gutes mit einsatz von druckluft

Family Cites Families (5)

* 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
JPS5722843A (en) * 1980-07-15 1982-02-05 Kitagawa Tekkosho:Kk Treatment of waste sand for casting
JPH0455038A (ja) * 1990-06-26 1992-02-21 Mazda Motor Corp 鋳型再生砂の再利用方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2909408A1 (de) * 1978-04-14 1979-10-18 Fischer Ag Georg Verfahren zur regenerierung von giesserei-altsand sowie regenerier-einrichtung und erzeugnis
DE4032798A1 (de) * 1989-11-28 1991-05-29 Fischer Ag Georg Verfahren zur regenerierbehandlung von ueberwiegend tongebundenem giesserei-altsand
DE4022339A1 (de) * 1990-07-13 1992-01-16 Kloeckner Humboldt Deutz Ag Vorrichtung zur oberflaechenabreinigung feinkoernigen gutes mit einsatz von druckluft

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103350186A (zh) * 2013-07-05 2013-10-16 广西玉林玉柴工业化工有限公司 混合型铸造废砂擦洗回收设备

Also Published As

Publication number Publication date
EP0767019B1 (fr) 1998-11-11
BR9603996A (pt) 1998-06-09
CH690322A5 (de) 2000-07-31
HU9602729D0 (en) 1996-11-28
DE59600805D1 (de) 1998-12-17
HUP9602729A3 (en) 2002-08-28
US5836369A (en) 1998-11-17
HUP9602729A2 (hu) 1998-12-28

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