EP0576922A1 - Verfahren und Einrichtung zur Regenerierung von Giesserei-Sand - Google Patents

Verfahren und Einrichtung zur Regenerierung von Giesserei-Sand Download PDF

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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
Authority
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.)
Withdrawn
Application number
EP93109653A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jovo Laskovic
Heinz Schneble
Peter Rossmanith
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 Giessereianlagen AG
Original Assignee
Georg Fischer Giessereianlagen 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 Giessereianlagen AG filed Critical Georg Fischer Giessereianlagen AG
Publication of EP0576922A1 publication Critical patent/EP0576922A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Casting Devices For Molds (AREA)
  • Mold Materials And Core Materials (AREA)
  • Centrifugal Separators (AREA)
EP93109653A 1992-07-01 1993-06-17 Verfahren und Einrichtung zur Regenerierung von Giesserei-Sand Withdrawn EP0576922A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH02063/92A CH687858A5 (de) 1992-07-01 1992-07-01 Einrichtung zur Regenerierung von Giesserei-Sand.
CH2063/92 1992-07-01

Publications (1)

Publication Number Publication Date
EP0576922A1 true EP0576922A1 (de) 1994-01-05

Family

ID=4225040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93109653A Withdrawn EP0576922A1 (de) 1992-07-01 1993-06-17 Verfahren und Einrichtung zur Regenerierung von Giesserei-Sand

Country Status (11)

Country Link
US (1) US5433389A (pt)
EP (1) EP0576922A1 (pt)
JP (1) JPH0663691A (pt)
KR (1) KR940001970A (pt)
CN (1) CN1083753A (pt)
AU (1) AU4144193A (pt)
BR (1) BR9302693A (pt)
CA (1) CA2098980A1 (pt)
CH (1) CH687858A5 (pt)
CZ (1) CZ133693A3 (pt)
MX (1) MX9303934A (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0687514A1 (de) * 1994-06-15 1995-12-20 Georg Fischer Giessereianlagen Ag Verfahren und Vorrichtung zur Regenerierung von Giessereialtsand

Families Citing this family (7)

* Cited by examiner, † Cited by third party
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 (zh) * 2006-12-21 2008-12-24 于彦奇 机械摩擦式树脂砂再生机
JP5435364B2 (ja) * 2010-07-27 2014-03-05 新東工業株式会社 鋳造ラインで発生する有害物質の処理方法および処理システム
CN102581218B (zh) * 2012-03-28 2013-11-06 濮阳市龙昊机械有限公司 滚筒组合式旋动型旧砂再生处理系统
MX361638B (es) * 2012-08-23 2018-12-13 Sintokogio Ltd Un aparato para recuperar arena de fundicion.
CN107107165B (zh) 2015-11-27 2019-01-01 株式会社松下工业 型芯砂再生装置
CN114713532B (zh) * 2022-04-26 2023-02-24 山东春冶机械制造有限公司 一种旧沙回收装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1289073A (fr) * 1961-05-04 1962-03-30 Kloeckner Humboldt Deutz Ag Broyeur pour le concassage fin de matières naturelles ou synthétiques
FR2507103A1 (fr) * 1981-06-04 1982-12-10 Kraemer & Grebe Kg Procede et installation de fragmentation d'une matiere
GB2241659A (en) * 1990-03-08 1991-09-11 Fischer Ag Georg Process for reclaiming used casting sand

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE151879C (pt) *
US3756406A (en) * 1970-07-14 1973-09-04 Us Agriculture Grain cleaner
FR2278424A1 (fr) * 1974-06-10 1976-02-13 Sapic Procede et appareil pour le nettoyage mecanique et pneumatique et le depoussierage d'une substance granuleuse et/ou pulverulente
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.
DE3309379A1 (de) * 1983-03-16 1984-09-20 Hubert Eirich Verfahren zur regenerierung von giessereialtsand und vorrichtung zur durchfuehrung des verfahrens
DE3341894C1 (de) * 1983-11-19 1985-03-14 Bayerische Motoren Werke AG, 8000 München Vorrichtung zum Entkernen von Gussstuecken durch Vibrationsschwingungen
GB8612498D0 (en) * 1986-05-22 1986-07-02 Mozley R H Minerals separator
CH679135A5 (pt) * 1989-12-06 1991-12-31 Fischer Ag Georg

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1289073A (fr) * 1961-05-04 1962-03-30 Kloeckner Humboldt Deutz Ag Broyeur pour le concassage fin de matières naturelles ou synthétiques
FR2507103A1 (fr) * 1981-06-04 1982-12-10 Kraemer & Grebe Kg Procede et installation de fragmentation d'une matiere
GB2241659A (en) * 1990-03-08 1991-09-11 Fischer Ag Georg Process for reclaiming used casting sand

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPIL Section Ch, Week 8906, Derwent Publications Ltd., London, GB; Class M22, AN 89-043897 [06] *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0687514A1 (de) * 1994-06-15 1995-12-20 Georg Fischer Giessereianlagen Ag Verfahren und Vorrichtung zur Regenerierung von Giessereialtsand

Also Published As

Publication number Publication date
CH687858A5 (de) 1997-03-14
AU4144193A (en) 1994-01-06
MX9303934A (es) 1994-02-28
BR9302693A (pt) 1994-01-25
CA2098980A1 (en) 1994-01-02
JPH0663691A (ja) 1994-03-08
CZ133693A3 (en) 1994-01-19
KR940001970A (ko) 1994-02-16
CN1083753A (zh) 1994-03-16
US5433389A (en) 1995-07-18

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