EP0634960B1 - Verfahren und vorrichtung zum regenerieren von giessereisand - Google Patents

Verfahren und vorrichtung zum regenerieren von giessereisand Download PDF

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Publication number
EP0634960B1
EP0634960B1 EP93903831A EP93903831A EP0634960B1 EP 0634960 B1 EP0634960 B1 EP 0634960B1 EP 93903831 A EP93903831 A EP 93903831A EP 93903831 A EP93903831 A EP 93903831A EP 0634960 B1 EP0634960 B1 EP 0634960B1
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EP
European Patent Office
Prior art keywords
sand
air
grinding
process according
disposed
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
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EP93903831A
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German (de)
English (en)
French (fr)
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EP0634960A1 (de
Inventor
Dietmar Prof. Dr.-Ing. Boenisch
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Individual
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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
    • B22C5/10—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
    • B22C5/02—Dressing by centrifuging essentially or additionally
    • 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 regenerating foundry sand according to claims 1 and 11.
  • Thermal-mechanical regeneration as described for example in EP-A-0 343 272 and compared with other known processes, is currently favored.
  • the sand is annealed in a first, the thermal treatment stage at temperatures of 500 to 900 ° C and, after appropriate cooling, placed in batches in a grinder or grinder, in which the dead burnt binder residues, which do not evaporate during the annealing process, are rubbed off the sand grains by rotating cross arms and by means of the sand filling of blown compressed air is discharged and discharged from time to time.
  • thermal regeneration treatment is viewed with increasing skepticism and will have to be dropped in the future.
  • the high acquisition, operating and maintenance costs of the systems required for this overwhelm many small and medium-sized foundries and force them to cooperate or operate as a contractor, which inevitably causes additional transport.
  • Recyclable materials made from bentonite and carbon-containing constituents that are still present in the old sand are burned dead and lost. Grains of sand shatter due to the abrupt changes in temperature and become waste, so that the amount of residues increases and the grain spectrum is changed inadmissibly.
  • the global climate problem is also forcing foundries to reduce their heat and CO2 emissions and to dispense with additional furnace processes.
  • Impact cleaning consumes a relatively large amount of compressed air and generates increased quantities of residues due to grain fragmentation.
  • Rotary drums with several drives and wipers also result in large, complex constructions with increased susceptibility to wear and malfunction due to the mostly hot accumulating used sand.
  • the dedusting is carried out either by cross air, which, however, only detects and removes the whirled up dust above the material, or by means of through air.
  • cross air which, however, only detects and removes the whirled up dust above the material
  • through air if the compressed air is blown into the sand batch through a large number of nozzles in the upper machine base, as in the grinding machine according to EP-A-0 343 272, a fluidized bed is created in the area of the transverse arms, and the necessary frictional action ceases.
  • sand containing active clay this leads to inadequate abrasion, which impairs the usefulness of the regenerated material for core production.
  • the machine running times are extended and throughput reduced.
  • a significant part of the abrasion is not removed with the through-air, but settles in the dead corner formed by the floor and side wall and is removed with the regenerate when the machine is emptied.
  • the process should be so flexible that the grain-to-grain friction can be gradually increased during a regeneration batch so that the foreign matter is removed first and only then is the abrasion of the hard material Grains of sand occur, which can significantly shorten the treatment time of a batch.
  • back-referring claims 2 to 10 and 12 to 20 contain advantageous refinements of the method or the machine technology of the plant, which according to claim 21 can also be used for rounding new sand grains, which experience has shown that they can be regenerated more easily in the subsequent recycling processes.
  • the binder residues adhering to the sand grains are not only loosened by the grinding rotor, but also by grain-to-grain friction within the moving sand mass.
  • This type of friction can be promoted by blowing sharp compressed air jets into the peripheral area of the filling and is particularly effective when electrostatically adhering plastic particles have to be removed.
  • too high a degree of fluidization in the area of the sand filling near the wall can significantly impair the main grinding through the rotor blades. In order to prevent this, the compressed air should be blown in at points that are close to the floor and near the wall.
  • the vertical circulation effect can be increased if the upward and downward currents are passed separately through a partition that begins below the sand surface and ends below the grinding rotor.
  • the amount and size of the sand bubbles can be influenced if the compressed air is blown in not only at the lowest point of the machine, but also partly through its side wall, whereby the side blowing points can be angularly offset from those near the ground.
  • the change in the flow behavior of the sand filling in the course of a regeneration batch also influences the current consumption of the drive motor, by which the regeneration progress can be recognized.
  • the current consumption is used as a signal for changes in the compressed air introduction and / or the rotational speed of the grinding rotor, as a result of which the grinding intensity is changed in a desired direction.
  • the control processes can take place automatically.
  • Such signals can also be used to determine the end of a batch runtime which is not uniform.
  • the machine runtime required for the respective regenerate depends on the used sand composition, which can change frequently within a molding sand cycle.
  • Some old sands contain a relatively large amount of loose dust, which mainly consists of coal dust and bentonite. It may therefore be advantageous to remove these valuable materials before starting the grinding treatment.
  • a pre-cleaning phase is used for this, in which the grinding rotor is stationary or only rotates so slowly that the sand filling is gently stirred.
  • the discharge of the dust can be controlled by cross air blown in radially or tangentially above the sand filling, from which possibly entrained fine grain sand can be cyclone-like centrally, at the latest but separates in a funnel-shaped sand trap, is returned to the sand cycle and thus remains in the sand grain spectrum.
  • the machine shown in Figures 1 and 2 has a covered upright cylindrical container 1, which is surrounded at the lower part by a jacket 2 with a base plate 9.
  • Parts 1 and 2 delimit air chambers 3, 3a, 4 into which feed lines 5, 5a, 6 open for compressed air, which as fluidizing and dedusting air through an annular gap 7 at the bottom and through air slots or slot nozzles 8 arranged higher in the container wall in the filled Blown in sand or as cross air over its surface and discharged through the outlet line 23 becomes.
  • a speed-controllable motor 12 is mounted centrally on the cover, which drives a grinding rotor 14 via a slightly conical shaft 13 close to a base plate 24 that can be opened for sand extraction.
  • the grinding rotor can also be arranged eccentrically and, as is customary with rotary vane mixers, driven from below, in which case only the extraction opening would have to be installed.
  • the sand is introduced through a closable filler neck 16 over the inclined surface of a funnel-shaped sand trap 20 to fill level 17.
  • Figure 2 shows that the air chambers near the floor are divided by partition walls 25 into two groups of segment-shaped individual chambers 26, 27. This subdivision can also extend to the overlying air chambers 3a shown in FIG.
  • the air chambers of each group are alternatively supplied with compressed air through lines (not shown in FIG. 2), which flow out in the direction of arrow 28 into the effective area 29 and fluidize the sand here.
  • portions 30, which are not or only slightly aerated, remain in this outer area 10 between the fluidized columnar active areas, which have a firmer consistency and act as braking and support areas against the rotational force introduced by the grinding rotor 14. Its wings therefore do not work mainly in the grinding-intensive fluidized inner region 11 and penetrate at most to a limited extent into the transition region to the regions 29 which are more permeated with compressed air.
  • FIG. 3 shows a different type of device, which has a circular gap 31 or several vertical individual nozzles tapering in the bottom like a nozzle and a partition wall 34 which is held concentrically above the grinding rotor 14 by means of ribs 35.
  • this device When this device is operated, compressed air is blown into the sand from an annular chamber 32 in a sharp jet 33, an additional friction effect occurring in the outer region 10 of the sand filling, which contributes to the complete detachment of the residual material particles removed by the grinding rotor 14.
  • This device can also be operated with a pre-cleaning phase, depending on the recyclable material content of the used sand, in which the recyclable materials are only discharged by the air blown in from the annular chamber 32 before the grinding rotor is brought slowly and then to the grinding speed, so that the sand filling in the movement indicated by the arrows 15, 33, 21, 19.
  • the mixing of the sand flowing up and down is prevented by the partition wall 34 and an undesired horizontal rotation by the ribs 35.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Processing Of Solid Wastes (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP93903831A 1992-04-10 1993-02-17 Verfahren und vorrichtung zum regenerieren von giessereisand Expired - Lifetime EP0634960B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4212097A DE4212097A1 (de) 1992-04-10 1992-04-10 Verfahren und Vorrichtung zum Regenerieren von Giessereisand
DE4212097 1992-04-10
PCT/DE1993/000168 WO1993020964A1 (de) 1992-04-10 1993-02-17 Verfahren und vorrichtung zum regenerieren von giessereisand

Publications (2)

Publication Number Publication Date
EP0634960A1 EP0634960A1 (de) 1995-01-25
EP0634960B1 true EP0634960B1 (de) 1996-04-17

Family

ID=6456559

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93903831A Expired - Lifetime EP0634960B1 (de) 1992-04-10 1993-02-17 Verfahren und vorrichtung zum regenerieren von giessereisand

Country Status (11)

Country Link
US (2) US5439044A (enrdf_load_stackoverflow)
EP (1) EP0634960B1 (enrdf_load_stackoverflow)
JP (1) JPH08504131A (enrdf_load_stackoverflow)
AT (1) ATE136826T1 (enrdf_load_stackoverflow)
AU (1) AU3491793A (enrdf_load_stackoverflow)
BR (1) BR9306220A (enrdf_load_stackoverflow)
CA (1) CA2117787A1 (enrdf_load_stackoverflow)
CZ (1) CZ248194A3 (enrdf_load_stackoverflow)
DE (2) DE4212097A1 (enrdf_load_stackoverflow)
HU (1) HUT70816A (enrdf_load_stackoverflow)
WO (1) WO1993020964A1 (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4318136A1 (de) * 1993-06-01 1994-12-08 Badische Maschf Gmbh Verfahren zum Regenerieren von Gießerei-Altsanden
TW462901B (en) * 1999-02-08 2001-11-11 Shinto Kogyo Ltd Method and apparatus for reclaiming casting sand
EP1222978A3 (en) * 2001-01-15 2007-10-17 Sintokogio, Ltd. A method for making sand covered with bentonite, the sand, and a method for recycling molding sand for a mold using the sand covered by bentonite
US6691765B2 (en) 2001-08-07 2004-02-17 Noram Technology, Ltd. Products for the manufacture of molds and cores used in metal casting and a method for their manufacture and recycle from crushed rock
US6631808B2 (en) 2001-08-07 2003-10-14 Particle And Coating Technologies, Inc. Air classifier system for the separation of particles
WO2005099931A1 (en) * 2004-04-13 2005-10-27 Keith Carter Process and apparatus for treating granular matter
PL2666562T3 (pl) * 2012-05-25 2014-12-31 Technofond Giessereihilfsmittel Gmbh Urządzenie regeneracyjne
PL223318B1 (pl) 2012-06-19 2016-10-31 Fabryka Osi Napędowych Skb Spółka Z Ograniczoną Odpowiedzialnością S Mechaniczny regenerator wirnikowy zużytej masy odlewniczej
EP2837424A1 (de) * 2013-08-13 2015-02-18 TARTECH eco industries AG Schlackenbrecher
CN103722123A (zh) * 2013-12-31 2014-04-16 常州市卓信机电设备制造有限公司 一种用于自硬砂混砂机的沸腾装置
EP3500379B1 (en) * 2016-08-22 2020-06-24 Amcol International Corporation Processes for recovering sand and active clay from foundry waste
JP7422131B2 (ja) * 2019-03-05 2024-01-25 伊藤忠セラテック株式会社 流動層炉における流動媒体の再生方法
CN114309458B (zh) * 2021-11-17 2023-06-30 盐城仁创砂业科技有限公司 一种再生砂表面杂质清洁装置

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US335574A (en) * 1886-02-09 fulleb
US1393092A (en) * 1918-05-02 1921-10-11 American Steel Foundries Method of and means for reclaiming molding-sand
GB471929A (en) * 1936-03-13 1937-09-13 Niels Sofus Borch Improvements relating to grinding mills
US2309036A (en) * 1940-09-12 1943-01-19 Beardsley & Piper Co Apparatus for conditioning molding sand
US2477948A (en) * 1946-10-12 1949-08-02 Dorr Co Sand scrubber
US2707314A (en) * 1951-10-23 1955-05-03 Simpson Herbert Corp Method of reclaiming granular material
GB746159A (en) * 1954-07-02 1956-03-07 Fiat Spa Apparatus for disintegrating and aerating moulding sand
US3782643A (en) * 1971-01-21 1974-01-01 Carborundum Co Apparatus for conditioning a granular material
DE2138531C3 (de) * 1971-08-02 1974-07-04 Badische Maschinenfabrik Gmbh, 7500 Karlsruhe Verfahren zum Kühlen von Gießerei-Formsand und Vertikalkühler dafür
US3881664A (en) * 1973-01-31 1975-05-06 Carborundum Co Wear plate in an apparatus for conditioning a granular material
DE2317129C3 (de) * 1973-04-05 1981-11-05 Glatt, Werner, 7859 Haltingen Wirbelschichtsprühgranulator
JPS5335622A (en) * 1976-09-16 1978-04-03 Hitachi Ltd Method and apparatus to regenerate used cast sand
JPS5619947A (en) * 1979-07-25 1981-02-25 Hitachi Ltd Method and apparatus for reclamation of used molding sand
US4436138A (en) * 1980-07-23 1984-03-13 Nippon Chuzo Kabushiki Kaisha Method of and apparatus for reclaiming molding sand
SU979018A1 (ru) * 1981-06-08 1982-12-07 Всесоюзный Научно-Исследовательский Институт Литейного Машиностроения,Литейной Технологии И Автоматизации Литейного Производства Устройство дл оттирки зернистых материалов
SU1006036A1 (ru) * 1981-10-02 1983-03-23 Всесоюзный научно-исследовательский институт литейного машиностроения, литейной технологии и автоматизации литейного производства Устройство дл сухой очистки зернистых материалов
DE3873522D1 (de) * 1988-05-26 1992-09-10 Pohl Giessereitechnik Verfahren und vorrichtung zum regenieren von giessereialtsanden.
CH682986A5 (de) * 1990-03-08 1993-12-31 Fischer Ag Georg Verfahren zur chargenweisen Regenerierbehandlung von überwiegend tongebundenem Giesserei-Altsand.
CH682056A5 (enrdf_load_stackoverflow) * 1990-03-08 1993-07-15 Fischer Ag Georg
DE4015031A1 (de) * 1990-05-10 1991-11-14 Kgt Giessereitechnik Gmbh Verfahren zum thermischen regenerieren von in giessereien anfallenden altsanden, sowie zur behandlung der im sandkreislauf anfallenden staeube
ATE158731T1 (de) * 1990-06-28 1997-10-15 Krupp Ag Hoesch Krupp Verfahren zum regenerieren von giesserei- altsanden
CH681283A5 (enrdf_load_stackoverflow) * 1990-08-16 1993-02-26 Fischer Ag Georg
DE4124416A1 (de) * 1991-07-23 1993-01-28 Krupp Polysius Ag Einrichtung und verfahren zur zerkleinerung von mahlgut unterschiedlicher koernung
JP2566884Y2 (ja) * 1992-05-27 1998-03-30 三井鉱山株式会社 粉砕機

Also Published As

Publication number Publication date
ATE136826T1 (de) 1996-05-15
HU9402907D0 (en) 1995-02-28
WO1993020964A1 (de) 1993-10-28
EP0634960A1 (de) 1995-01-25
DE4212097A1 (de) 1993-10-14
JPH08504131A (ja) 1996-05-07
CA2117787A1 (en) 1993-10-11
DE59302276D1 (de) 1996-05-23
DE4212097C2 (enrdf_load_stackoverflow) 1994-01-27
US5439044A (en) 1995-08-08
AU3491793A (en) 1993-11-18
CZ248194A3 (en) 1996-02-14
BR9306220A (pt) 1998-06-30
US5520341A (en) 1996-05-28
HUT70816A (en) 1995-11-28

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