EP0552354B1 - Dispositif pour la regeneration par voie seche de vieux sables de fonderie - Google Patents

Dispositif pour la regeneration par voie seche de vieux sables de fonderie Download PDF

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Publication number
EP0552354B1
EP0552354B1 EP92917813A EP92917813A EP0552354B1 EP 0552354 B1 EP0552354 B1 EP 0552354B1 EP 92917813 A EP92917813 A EP 92917813A EP 92917813 A EP92917813 A EP 92917813A EP 0552354 B1 EP0552354 B1 EP 0552354B1
Authority
EP
European Patent Office
Prior art keywords
separator
sand
arrangement according
air
axis
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
EP92917813A
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German (de)
English (en)
Other versions
EP0552354A1 (fr
Inventor
Hermann Hofbauer
Erich Müller
Erhard Putzig
Ekart Schaarschmidt
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.)
Kuenkel-Wagner Prozesstechnologie GmbH
Original Assignee
KUENKEL-WAGNER SERVICE und VERTRIEBSGESELLSCHAFT MBH
KUENKEL WAGNER SERVICE und VER
Kuenkel-Wagner Service und Vertriebsgesellschaft Mbh
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.)
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Application filed by KUENKEL-WAGNER SERVICE und VERTRIEBSGESELLSCHAFT MBH, KUENKEL WAGNER SERVICE und VER, Kuenkel-Wagner Service und Vertriebsgesellschaft Mbh filed Critical KUENKEL-WAGNER SERVICE und VERTRIEBSGESELLSCHAFT MBH
Publication of EP0552354A1 publication Critical patent/EP0552354A1/fr
Application granted granted Critical
Publication of EP0552354B1 publication Critical patent/EP0552354B1/fr
Anticipated expiration legal-status Critical
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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

Definitions

  • the invention relates to an arrangement for dry regeneration of foundry sands with the features of the preamble of claim 1.
  • Such arrangements are known, for example from DE-PS 28 56 536, DE-OS 39 09 535, EU-A1-00 60 394, US-PS 42 66 673 or DE-OS 22 33 111.
  • a plurality of separator cells are arranged in a common upper housing box, an outlet chamber being arranged above the impact bell for each separator cell, into which the gas emerging from the impact bell enters with the detached material particles and which are connected to a common exhaust air collector.
  • each separator has an umbrella-like catching device which is designed such that it passes on a partial flow of the stream of sand falling from the impact bell in a veil-like manner into the next separator cell, while the other partial flow is returned to the inlet nozzle of the riser pipe .
  • Another disadvantage is that high forces have to be exerted to separate the binder casings, which lead to the sand grains being partially destroyed on the impact bell and an undesirable change in the sand grain structure occurring.
  • the arrangement is particularly suitable for dry regeneration in a plant in which the used sand is treated with air or an air / gas mixture of a relatively low temperature of a maximum of 550 ° C., preferably significantly below, so that the clay-like binders in particular and the brighteners that are released from the sand grains of the old sand can largely be used again as binders.
  • the separator of each separator cell counteracts a large number of friction and swirl surfaces against the braked and deflected material jet emerging from the riser pipe, which divides this material jet into a plurality of partial flows of the friction surfaces, swirling strongly and causing the grains of sand in the area of the separator to move together in a strongly stirring manner Get relative movement. Due to the division into partial flows and their strong swirling in a small space, a high degree of efficiency is achieved when loosening the binder coatings. At the same time, however, the solid particles are already classified in the area of the separator and its flat elements.
  • the coarser particles or grains of sand remain in the area of the radially flat elements, while the loosened binder particles and the fine impurities are carried along with the air flow flowing outward through the baffles formed by the flat elements and carried out upwards.
  • the separation of the finer particles is further improved by the division into partial streams and the associated intensive enlargement of the surface of the flowing mixture.
  • claim 2 with friction are subject to a strong friction effect and a further screening when leaving the deflection element, since part of the carrier air or the carrier air / Gas mixture flows downwards and, when leaving the flat elements of the separator, flows outwards and upwards to the outlet, taking finer parts with it upwards. You get not only a very intensive cleaning effect but also a reliable and effective screening. Additional expansion rooms or facilities for supplying additional air for viewing are not required.
  • the arrangement can thus also be designed relatively simply and arranged in a space-saving manner.
  • the further sub-claims 3 to 10 contain features for a particularly favorable embodiment of the separator.
  • the measures according to claims 15 and 16 result in a particularly simple material management and a compact arrangement which can be operated essentially automatically and continuously, in particular if the anode is designed according to claims 11 to 14.
  • the arrangement according to the invention is used with particular advantage in the dry regeneration of old foundry sands in systems in which the old foundry sand is only treated at relatively low temperatures of maximum 550 ° C.
  • the used sand is treated in a first separator stage 1 with an air gas mixture with a temperature of approximately 300 ° C.
  • the used sand is prepared in the usual way by separating metal parts and the like and introduced into the separator 1 at 2.
  • the air gas mixture is supplied by a blower 4, which comes via line 3 from a heat exchanger 6, which is connected to a burner circuit 30, the exhaust air of which is discharged at 29.
  • the separator 1 is connected with respect to the air gas mixture to form a closed circuit via a separator 5, in which the exhaust air emerging from the separator 1 is freed of dust and fine particles and is returned to the heat exchanger 6.
  • the separated solids are derived at 7.
  • the materials derived from 7 consist primarily of reusable active binder components which can be collected in corresponding silos.
  • Some of the separated substances can also be fed to the burner 30 as fuel. Part of the air can also be fed to the burner as the medium to be heated. In this case, a proportion of fresh air is supplied to the circuit mixture.
  • the sand treated in the separator 1 passes via the transfer line 12 into a second separator 10, in which the old sand is again in the circuit led air of significantly lower temperature is treated in the same way.
  • the air is supplied via the blower 14, while the treated used sand 22 is fed to a cooler 20, in which the blower 21 cools the sand down to the desired operating temperature. From there the sand reaches a sand bunker via line 23.
  • the circulating air passes from the separator 10 into a separator 15.
  • the separated solids are fed to the burner, as is part of the air as fresh air.
  • the fuel quantities still missing can be fed separately to the burner via line 31.
  • the solid particles separated from the cooling air at 25 and collected at 27 can also be fed to the burner, while the cleaned cooling air is discharged into the atmosphere at 28.
  • the separators 1 and 10 are essentially the same. Each separator 1 or 10 consists of one or more rows of several separator cells 38a to 38f or 48a etc. connected in parallel. Each separator cell forms a separate unit which is separated from the other separator cells by a housing 60, 61 (FIG. 3) consists of a hollow cylindrical lower housing section 61 and an upper truncated cone-shaped housing 60.
  • the individual separator cells are arranged close together in the flow direction along a falling line.
  • the supply lines 40a and 50a connected to the lower ends of the cells for the air / gas mixture and the process air, as well as the collecting lines 41 and 51 for the detached sheathing particles and foreign matter, with which the truncated cone is used, have a correspondingly relatively steep incline Housing part 60 is connected via the nozzle 77.
  • the feed point for the used sand shown in FIG. 1 at 2 is represented in FIG. 2 by a belt conveyor 35 and a bucket conveyor 36 or 46, the used sand being fed to the lower housing part 61 of the separator cell at 37 and via a corresponding transfer line 39 of falling inclination as shown by transfer line 68 in FIG.
  • the distribution line for gas / air mixture or air is designated 62a.
  • the separator cell 38/48 is connected to this via the lower inlet connection 62.
  • the air or the air gas mixture could also be supplied at 62b, as indicated by the broken line in FIG. 3.
  • In the lower part of the Housing 61 is provided with a valve-like installation 63, with which valve part 64, which is movable in the vertical direction via control device 65, cooperates in order to be able to close lower housing part 61 above the air supply device.
  • the nozzle-shaped inlet opening 67 of a riser 66 is shown at a distance above the valve.
  • the valve device is closed during start-up in order to prevent sand located in the housing part 61 from falling into the ventilation duct until there is sufficient air pressure below the valve in order to reliably entrain the sand into the riser pipe 66 when the valve is opened.
  • a discharge device 70 is arranged in the lower housing part 61 in the form of a sheet which half covers the interior of the housing 61 and has the inclination of the outlet transfer line 69.
  • the sand conveyed up in the riser falls onto the discharge device 70 and can slide into the outlet transfer line 69. If the line does not take up the sand, the excess sand still falls below and is conveyed up again through the riser pipe 66.
  • a flap 90 can be provided, which is arranged at an angle ⁇ at an angle (FIG. 6) such that the sand sinking in the housing 61 closes the flap. The flap only opens again when the sand level in the housing 61 falls below the flap level.
  • the dwell time of the sand in the plant and thus the regeneration time are regulated in a simple manner via the sand's throughput speed.
  • a separator 75 is freely arranged in the upper double-cone-shaped housing part 60, approximately at the height of the cylindrical central section of the largest diameter of the housing part 60.
  • the separator has a flat, preferably circular separator plate 80 which is arranged centrally above the outlet of the riser pipe 66 and transversely to the riser pipe axis. In the middle, the separator plate has a deflecting cone 82 tapering downwards. A plurality of individual flat elements project downward from the plate 80 perpendicular to the plate 80 and parallel to the axis of the riser pipe 66. Each flat element 84 or 86 is flat or curved inwards to concave.
  • planar elements are each distributed over partial circles 83 and 85 of different radius. Two such partial circles are shown in the design. However, more than two partial circles can also be provided.
  • Each flat element preferably has an approximately rectangular outline, the center line of greater length running essentially parallel to the axis of the riser pipe.
  • the center lines can also have a slight inclination inwards or outwards with respect to the riser axis.
  • the flat elements can also be at least partially replaced by V-shaped or semicircular elements which are arranged as described.
  • the flat elements 84, 86 of partial circles adjacent in the radial direction are set to a gap.
  • the circumferential width of the elements 86 in the outer pitch circle corresponds approximately to the clear circumferential distance between these elements or is only slightly larger.
  • the circumferential width of the planar elements 84 on the radially inner pitch circle 83 is approximately equal to the clear circumferential distance of the elements 86 of the first outer pitch circle or is preferably somewhat less.
  • the mass flow emerging from the riser 66 hits the deflection cone 82, is thus expanded and deflected and swirled over the surface and strikes the surface elements of the partial circle 83 lying there.
  • the flat flow is broken up into a large number of partial flows, with some partial flows being deflected and swirled and thereby also influence and swirl the neighboring partial flows.
  • the partial flows passing between the elements of the inner partial circle meet the elements of the outer pitch circle and are redirected and swirled there. In this way, a strongly swirled fluidized sand bed with strong internal friction of the grains of sand against one another and numerous friction surfaces on cone 82, plate 80 and elements 84 and 86 is created in a confined space.
  • a downwardly conically tapering hollow truncated cone 66a below the deflecting element 75, on which the sand particles impact, which still have sufficient energy and movement to the outside through the air, while those that flow downward in part from the sheet-like elements Air flows upwards in this area transversely to the movement of the sand mass and can entrain further fine particles.
  • the funnel element 66a guides the sand cloud into the annular space below.
  • the air and the fine particles are collected in the collectors 41 and 51, respectively, and fed to the separator.
  • a coarse separator can be connected to this, through which coarser components are discharged prematurely and fed back to the feed point of separator 1 or separator 10 via line 41 or the like.
  • the inclined air supply line 40a or 50a can be used to easily remove the sand still contained in the separator cells by lowering the valve elements 64.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Mold Materials And Core Materials (AREA)
  • Braking Arrangements (AREA)

Claims (16)

  1. Dispositif pour la régénération par voie sèche de vieux sables de fonderie, dans lequel le vieux sable comportant des enrobages de liant et des impuretés et de l'air à la température ambiante ou un mélange d'air et de gaz porté à une température maximale de 550 °C sont destinés à être acheminés dans un étage d'épuration mécanique se présentant sous la forme d'un séparateur multicellulaire et chaque cellule séparatrice comporte une colonne montante ouverte à chacune de ses extrémités, un séparateur disposé à une certaine distance au-dessus et vis à vis de l'orifice de sortie supérieur de la colonne montante, muni de surfaces déviant et freinant le jet de vieux sable - air ou de vieux sable - mélange d'air et de gaz, une soufflante pour l'insufflation de l'air ou du mélange d'air et de gaz, un dispositif d'alimentation pour l'introduction du sable et pour son acheminement d'une cellule séparatrice à l'autre, un dispositif d'extraction du sable de la cellule séparatrice ainsi qu'un dispositif de collecte et d'évacuation des produits d'enrobage et des impuretés, se caractérisant par le fait que le séparateur (75) de chaque cellule séparatrice (38 et 48) comporte, en plus des surfaces de freinage et de déviation (80, 82) du jet remontant dans la colonne montante (66) plusieurs éléments plats (84, 86), qui sont disposés, à des intervalles périphériques opposés, autour de l'axe de la colonne montante (66) suivant une répartition telle que chaque élément fait saillie, en réalisant une action de freinage, dans le flux d'écoulement du jet dévié et le divise en jets fractionnés tout en lui imprimant un mouvement tourbillonnaire.
  2. Dispositif selon la revendication 1, caractérisé en ce que plusieurs éléments plats (84 et 86) sont respectivement disposés répartis en forme de couronne autour de l'axe de la colonne montante (66), en respectant des intervalles périphériques prédéterminés, sur au moins deux cercles primitifs de diamètre différent.
  3. Dispositif selon la revendication 2, caractérisé en ce que les éléments plats (84 et 86) sont disposés sur des cercles primitifs (83, 85) se succédant dans le sens radial, réciproquement décalés dans le sens de la périphérie pour créer une solution de continuité.
  4. Dispositif selon la revendication 2 ou 3, caractérisé en ce que, par rapport à l'axe de la colonne montante (66), l'intervalle périphérique libre opposé des éléments plats (84 et 86), de préférence sur chaque cercle primitif (83 et 85), correspond respectivement substantiellement à la cote périphérique de l'élément plat et notamment n'est que légèrement plus petit.
  5. Dispositif selon les revendications 2 à 4, caractérisé en ce que, par rapport à l'axe de la colonne montante (66), la largeur de l'élément plat (84) est, dans le sens de la périphérie d'un cercle primitif intérieur (83), substantiellement identique à, de préférence légèrement plus petite que l'intervalle libre, mesuré dans le sens périphérique, des éléments plats (86) du cercle primitif le plus proche de l'extérieur (75).
  6. Dispositif selon l'une des revendications 2 à 5, caractérisé en ce que chaque élément plat (84, 86) se présente, vu depuis l'axe de la colonne montante (66), sous la forme d'une plaque plane ou légèrement concave, qui est orientée parallèlement à l'axe de la colonne montante (66) et dont la face est substantiellement tangentielle ou concentrique à cet axe.
  7. Dispositif selon la revendication 6, caractérisé en ce que chaque élément plat a une forme rectangulaire et que parallèlement à l'axe de la colonne montante (66), sa longueur est plus grande que dans le sens tangentiel à l'axe.
  8. Dispositif selon l'une des revendications 2 à 7, caractérisé en ce que les éléments plats (84, 86) font saillie vers le bas suivant une orientation sensiblement verticale à partir d'une plaque séparatrice (80) substantiellement plane, ayant de préférence une forme substantiellement circulaire.
  9. Dispositif selon la revendication 8, caractérisé en ce que la plaque (80) comporte, disposé coaxialement par rapport à la colonne montante (66) un corps séparateur (82) dont la pointe est orientée vers le bas, ayant de préférence une forme conique.
  10. Dispositif selon la revendication 8, caractérisé en ce que le diamètre de la plaque (80) et les rayons des cercles primitifs (83, 85) sont choisis en fonction de la vitesse et du diamètre du jet de matières sortant de la colonne montante (66), dans des conditions telles que dans la zone définie par le séparateur (75), la séparation entre le sable et les particules d'impuretés et d'enrobage décollées s'effectue.
  11. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les éléments plats du séparateur ont au moins en partie, pour un observateur placé parallèlement à l'axe de la colonne montante (66), la forme d'un V.
  12. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'enveloppe de la cellule séparatrice est munie d'une tôle (70) placée dans le sens d'une gaine d'acheminement dans la cellule séparatrice suivante, qui ne recouvre que partiellement la section de l'enveloppe, mais qui est disposée de telle façon que le vieux sable peut s'évacuer dans la gaine de transfert d'évacuation en passant sur cette tôle (70).
  13. Dispositif selon la revendication 12, caractérisé en ce que les gaines d'acheminement (68, 69) comportent chacune, à leur extrémité, un clapet (90, 91), qui est automatiquement fermé par le sable descendant dans l'enveloppe, jusqu'à ce que le sable soit parvenu au-dessous du niveau du clapet.
  14. Dispositif selon l'une des revendications 1 à 13, se caractérisant par le fait que l'élément séparateur (75) de chaque cellule séparatrice est disposé dans une partie biconique (60) de l'enveloppe de la cellule séparatrice dans des conditions telles qu'entre la paroi intérieure de cette partie et la périphérie du séparateur (75) il subsiste un interstice dont la dimension correspond au moins à la moitié de la cote radiale de la plaque plane (80), le tronc de cône supérieur étant raccordé au dispositif (77) d'évacuation des matières d'enrobage et autres impuretés dissociées du sable.
  15. Dispositif selon l'une des revendications 1 à 14, caractérisé en ce que les cellules de chaque séparateur (38) sont disposées, dans le sens du cheminement des matières, suivant une ligne orientée obliquement vers le bas, de préférence tout près l'une de l'autre et que les gaines d'amenée et d'évacuation ainsi que les gaines de transfert (39, 40a, 41 et 49, 50a, 51) ont une disposition en pente correspondante.
  16. Dispositif selon l'une des revendications 1 à 15, caractérisé en ce que la gaine d'amenée (40a, 50a) de l'air ou du mélange de gaz et d'air fait également office de conduite pour l'évacuation du sable des différentes cellules séparatrices ou de l'ensemble de celle-ci.
EP92917813A 1991-08-14 1992-08-13 Dispositif pour la regeneration par voie seche de vieux sables de fonderie Expired - Lifetime EP0552354B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4126976 1991-08-14
DE4126976A DE4126976C1 (fr) 1991-08-14 1991-08-14
PCT/EP1992/001858 WO1993003872A1 (fr) 1991-08-14 1992-08-13 Dispositif pour la regeneration par voie seche de vieux sables de fonderie

Publications (2)

Publication Number Publication Date
EP0552354A1 EP0552354A1 (fr) 1993-07-28
EP0552354B1 true EP0552354B1 (fr) 1997-01-02

Family

ID=6438349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92917813A Expired - Lifetime EP0552354B1 (fr) 1991-08-14 1992-08-13 Dispositif pour la regeneration par voie seche de vieux sables de fonderie

Country Status (6)

Country Link
US (1) US5421462A (fr)
EP (1) EP0552354B1 (fr)
JP (1) JPH06503997A (fr)
AT (1) ATE146995T1 (fr)
DE (2) DE4126976C1 (fr)
WO (1) WO1993003872A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5938045A (en) * 1996-01-12 1999-08-17 Ricoh Company, Ltd. Classifying device
DE102005029742B3 (de) * 2005-06-24 2006-08-24 Klein Anlagenbau Ag Verfahren zum Behandeln von Gießereiformstoffen
DE102005041519A1 (de) * 2005-08-31 2007-03-01 Klein Anlagenbau Ag Verfahren zum Behandeln von Gießereiformstoffen
CA2916810A1 (fr) * 2015-01-12 2016-07-12 Russell Wynn Driver Raffinage de sable en vue de retirer les impuretes
CN113477525B (zh) * 2021-07-20 2022-06-21 天津水泥工业设计研究院有限公司 一种带有挡料锥的半成品粗细分离选粉机设计方法

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
DE135862C (fr) *
DE2233111C3 (de) * 1972-07-06 1974-11-28 Hermann 2105 Seevetal Jacob Verfahren und Vorrichtung zum Regenerieren von kunstharzgebundenem Gießereialtsand
US4226673A (en) * 1976-03-15 1980-10-07 Champion International Corporation Color removal from paper and pulp mill aqueous effluents
CS184400B1 (en) * 1977-04-25 1978-08-31 Jaroslav Bodecek Equipment for regenaration especially of dry foundry sands
US4177952A (en) * 1978-04-24 1979-12-11 National Engineering Company Impact scrubber
IT1124576B (it) * 1978-10-26 1986-05-07 Hartmann Wibau Maschf Disposizione e conformazione di un setaccio in un impianto in convogliamento ad aria di aspirazione funzionante sostanzalmente ad una pressione compresa fra 0,6 e 0,8
GB2041251B (en) * 1978-11-24 1982-10-20 Hosolawa Funtai Kogaku Kenkyus Pneumatic classifier
US4257880A (en) * 1979-06-28 1981-03-24 Jones Donald W Centrifugal air classifying apparatus
DE2949618C2 (de) * 1979-12-10 1985-05-15 Nippon Pneumatic Manufacturing Co., Ltd., Osaka Windsichter
DE3110578A1 (de) * 1981-03-18 1982-09-30 Hermann 2105 Seevetal Jacob Vorrichtung zur reinigung von giessereialtsand
DE3636479A1 (de) * 1986-10-27 1988-05-05 Foerder & Anlagentechnik Gmbh Verfahren und anordnung zur thermo-mechanischen regenerierung von schuettguetern, insbesondere von giesserei-altsand
SU1599136A1 (ru) * 1988-03-29 1990-10-15 Московский Горный Институт Пневмогравитационный классификатор
SU1738389A1 (ru) * 1989-02-23 1992-06-07 Белорусский Государственный Институт Народного Хозяйства Им.В.В.Куйбышева Классификатор
DE3909535A1 (de) * 1989-03-22 1990-10-04 Hermann Jacob Vorrichtung zur reinigung von giessereialtsand
FR2658096B1 (fr) * 1990-02-13 1992-06-05 Fives Cail Babcock Selecteur a air a action centrifuge.

Also Published As

Publication number Publication date
JPH06503997A (ja) 1994-05-12
WO1993003872A1 (fr) 1993-03-04
EP0552354A1 (fr) 1993-07-28
DE59207811D1 (de) 1997-02-13
ATE146995T1 (de) 1997-01-15
US5421462A (en) 1995-06-06
DE4126976C1 (fr) 1993-01-07

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