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EP2155417B1 - Procédé de préparation de sable de fonderie - Google Patents

Procédé de préparation de sable de fonderie Download PDF

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Publication number
EP2155417B1
EP2155417B1 EP20080736404 EP08736404A EP2155417B1 EP 2155417 B1 EP2155417 B1 EP 2155417B1 EP 20080736404 EP20080736404 EP 20080736404 EP 08736404 A EP08736404 A EP 08736404A EP 2155417 B1 EP2155417 B1 EP 2155417B1
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EP
European Patent Office
Prior art keywords
molding sand
water
compressibility
corrective
mixer
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.)
Not-in-force
Application number
EP20080736404
Other languages
German (de)
English (en)
Other versions
EP2155417A1 (fr
Inventor
Roland Seeber
Clemens Kohler
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.)
Maschinenfabrik Gustav Eirich GmbH and Co KG
Original Assignee
Maschinenfabrik Gustav Eirich GmbH and Co KG
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 Maschinenfabrik Gustav Eirich GmbH and Co KG filed Critical Maschinenfabrik Gustav Eirich GmbH and Co KG
Priority to SI200831446T priority Critical patent/SI2155417T1/sl
Priority to PL08736404T priority patent/PL2155417T3/pl
Publication of EP2155417A1 publication Critical patent/EP2155417A1/fr
Application granted granted Critical
Publication of EP2155417B1 publication Critical patent/EP2155417B1/fr
Not-in-force legal-status Critical Current
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
    • B22C5/18—Plants for preparing mould materials
    • B22C5/185—Plants for preparing mould materials comprising a wet reclamation step
    • 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
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/044—Devices having a vertical stirrer shaft in a fixed receptacle

Definitions

  • the present invention relates to a method for the treatment of foundry sand.
  • Casting is probably the most important primary molding process. In this case, a melt of the material to be processed is poured into a mold in which it then solidifies and forms the casting to be produced.
  • lost forms are used.
  • These molds are made of molding sand, i.e., quartz sand and a binder. These shapes are usually created by modeling models. In the form of the liquid material is then filled. After solidification of the material, the molding sand can be removed, that is, the casting are removed from the mold, whereby the mold is destroyed. Therefore, this type of form is called a lost form.
  • the sand must i.a. be mixed with suitable binders.
  • suitable binders care is taken in principle that the molding sand to be used has as good as possible to the material adapted properties. In this case, for example, the casting material used and the associated melting temperature but also the outside and possibly inner contour of the molding to be observed.
  • the quality of the molding sand depends essentially on the clay content, the grain size and the grain distribution, the shape and surface of the quartz bodies, the type and amount of accompanying materials, the moisture content and the degree of compaction.
  • the used foundry sand is as a rule completely recycled and reused for cost and environmental reasons, especially since per unit weight of casting incurred in general 5 to 15 parts by weight molding sand. At least 90% of the used foundry sand can be processed and fed back to the Forrrik cycle, since the binder coats are still largely effective, so that only water and possibly binder must be supplied. Part of the used sand is removed from the cycle and replaced with fresh feedstock.
  • clay-bonded foundry sands are used, which are usually returned to a conditioning process after the casting process, where sufficient amounts of water, binders (e.g., bentonite), additives (e.g., coal dust), and virgin sand are again mixed into the used sand.
  • binders e.g., bentonite
  • additives e.g., coal dust
  • the treatment generally takes place in a mixer and often under vacuum to simultaneously cool the molding sand. During the preparation, it must be ensured that the binder surrounds the quartz sand grains as well as possible.
  • the aim of this treatment is that of the recycled sand leaving the mixer has a uniform quality.
  • the quality of G manereialtsandes fluctuates due to the thermal stress during the casting process as a function of the particular production program, so that constantly old sand with fluctuating moisture and Schlämmstoffgehalt is returned to the processing plant.
  • the aim of a well-functioning treatment is therefore always to recognize fluctuations in the used sand and to correct them by corrective measures, such as adjustment of the amount of water added or of the binder content, which are introduced into the treatment process.
  • the DE 2053936 describes a further development of CH 517,541 in addition to the power consumption of the fast-running auxiliary tool, the current consumption of the rotating mixing container is used in addition to more accurate determination of the mixed moisture content.
  • the addition of water takes place here again successively in several sub-steps in the currently to be processed molding sand through the control of solenoid valves in water supply.
  • a temperature signal is included in the calculation to correct the amount of water.
  • this improved solution leads to unnecessarily long and especially different lengths wet mixing, since after each addition of a subset of water, the mix again takes a certain amount of time until it opposes the mixing tool constant greater resistance.
  • a disadvantage of this solution is that the residence time in the mixer can not be selectively controlled and depends on the dosing of the feed belt.
  • the angle of repose of the incoming molding sand in the drum mixer strongly depends on the input moisture and thus the mixing tool is covered differently with molding sand, which in turn greatly affects the engine performance.
  • the molding sand since again after the addition of water, the molding sand takes a certain amount of time until the water can lead to a noticeable change in the resistance and thus the power consumption, this method easily leads to an over-wetting of the molding sand.
  • the JP 56053844 describes a method for the correction of the molding sand quality by fluctuating Feststoffseinwaagen resulting from the timely addition of used sand into a storage tank by real power measurement on a Kollerantrieb.
  • the humidity and the bentonite content of the used sand are simultaneously corrected in a collating mixer on the basis of the engine power difference between a measured value after adding the used sand to the mixer and a second measured value after adding a predefined amount of water and binder and a fixed mixing time.
  • the re-feeding of the missing amount of water and binder takes place after a second measurement in the same molding sand on the basis of the experimentally determined relationship between moisture content and engine power difference and binder content and engine power difference.
  • the object of the present invention is to provide a method with a simple control system for controlling the compressibility of a recirculating molding sand.
  • a part of the molding sand to be processed is filled in a mixer and the force required for the movement of the mixing tool is measured.
  • This force measurement can most easily be measured indirectly via the active power of the mixer. Basically, it is not necessary to determine an exact measurement for the required force, but it is quite sufficient to measure a size that represents a measure of the force required, since the method less the force, but rather the compressibility of the molding sand is important.
  • the mixer is charged via a gravimetric solids balance with a constant amount of used sand.
  • the power consumption of the drive motor MP 1 is detected and converted into an actual humidity value F 1 via the experimentally determined calibration curve between engine power and humidity. From the known relationship between moisture and compressibility for a given sludge content SG is calculated from the target compressibility V Soll the necessary target humidity F setpoint and compensated for the resulting moisture difference .DELTA.F 1 by a single addition of water in the mixer.
  • the molding sand After adding the amount of water, the molding sand is prepared in the mixer a preset mixing time and added at the end of the preparation of this molding sand quantity just before emptying a second measured value MP 2 for the effective power of the mixing tool.
  • the preparation of the subsequent molding sand quantities is therefore influenced by the correction measurement which was carried out in the immediately preceding molding sand batch processing after the preparation.
  • the mixing time in the mixer can be kept constant and on the other hand long-term fluctuations in the used sand composition can be compensated.
  • This is done via an automatic adjustment of the correction water quantities of gradual changes in the sand composition.
  • the compressibility is controlled at the end of the treatment and - if a deviation from the setpoint is determined - adapted the preparation of future molding sand quantities accordingly.
  • the correction value thus no longer has an effect on the molding sand quantity at which the deviation was determined, but only on molding sand quantities to be subsequently processed.
  • the treated molding sand has an elevated temperature compared to the environment, it comes after the addition of water for evaporation of a portion of the added water in the mixer downstream equipment parts such as the discharge belt.
  • To compensate for this loss of moisture is in a preferred embodiment of the temperature of the used sand on an energy balance on the expected decrease in moisture by evaporation closed and this additional amount of moisture F Eva p (T) also added to the molding sand.
  • the mixer is evacuated during processing. This results in a boiling point reduction of the water contained in the molding sand, so that at least a portion of the water evaporates and is effectively cooled due to the required evaporation energy of the remaining molding sand. Since the reclaimed molding sand is usually taken directly from the unwrapped form, it is anyway too hot for further processing and must be cooled. A treatment under vacuum not only shortens the treatment process, but also leads to a better quality of the processed molding sand.
  • the molding sand in addition to the amount of evaporation water, which in this case from the final temperature of the processed molding sand, which corresponds to the set final pressure, results in exactly the amount of water F Cool supplied before the preparation, which is necessary to cool the molding sand from its actual temperature to the desired temperature.
  • F Cool supplied before the preparation which is necessary to cool the molding sand from its actual temperature to the desired temperature.
  • a measurement of the temperature of the untreated molding sand can be used, wherein the temperature measurement can be done in the Altsandzu Installation.
  • the temperature of the used sand e.g. is conveyed to the scale over Altsandb or the subsequent water correction to compensate for the amount of evaporation water or treatment under vacuum to determine the amount of water that is used for evaporative cooling.
  • the temperature-dependent water loss F Evap (T) is calculated by evaporation over the previously measured in used sand used sand or from the final pressure of the vacuum treatment on the vapor pressure curve of the boiling water in a known manner via an energy balance and additionally fed to the mixture.
  • the correction function of the moisture correction is subdivided into three sections as a function of the determined moisture difference between actual compressibility and nominal compressibility at the end of the treatment.
  • the correction function follows an nth-order polynomial with n> 1, so that small deviations only lead to very small changes in the moisture addition and greater deviations are taken into greater account.
  • the humidity correction follows a linear relationship, while in a third section, which connects directly to the second section, it is limited to a fixed maximum value.
  • the correction of the compressibility difference takes place alternatively or in combination by adding new sand or a mixture of fine substances, such as bentonite, pulverized coal and filter dust, to the mixture.
  • new sand or a mixture of fine substances such as bentonite, pulverized coal and filter dust
  • the power consumption of the drive motor is detected and converted over the calibration curve between engine power and humidity in an actual humidity value.
  • the difference to a previously defined final moisture content taking into account the amount of evaporation water based on the temperature determined in the used sand is compensated by adding water into the mixture.
  • a preset mixing time of the molding sand is processed in the mixer and at the end of the preparation of this molding sand quantity shortly before emptying a second measured value for the active power of the mixing tool detected.
  • the difference between the desired and actual compressibility is determined.
  • This compaction difference determined in this way is then converted into a correction value for correction of the sludge content in the formulation via a correction function defined in sections, which is correspondingly taken into account in the subsequent preparation of another molding sand quantity in the determination of the necessary quantities of aggregate.
  • the content of the slurry in the mixture is too low and must be reduced by adding fines, e.g. be increased in the form of a mixture of bentonite, coal dust and filter dust, while at a negative difference between actual and target compressibility of the sludge content in the mixture is too high and must be reduced by the addition of coarse new sand.
  • the correction function of the aggregates as a function of the compaction difference between actual compressibility and nominal compressibility determined at the end of the preparation is subdivided into 3 sections.
  • the correction function follows an n-th order polynomial with n> 1, so that small deviations only lead to very small changes in the additive addition.
  • the aggregate correction follows a linear relationship, while in a third section, which directly adjoins the second section, it is limited to a specified maximum value.
  • a portion, preferably about 80 - 90%, of the required amount of water are metered into the mixer.
  • the determination of the necessary amount of moisture missing to achieve the predetermined target compressibility On the basis of the first active power measurement after addition and mixing of the water, the determination of the necessary amount of moisture missing to achieve the predetermined target compressibility. After determining and adding the amount of residual water according to equation (1), which in this case only compensates for the missing 10 to 20%, the second active power measurement takes place shortly before emptying at the sum of constant wet mixing time, so that in turn the actual Moisture or actual compressibility can be determined and is available for the correction of the amount of water added in the subsequent molding sand quantity.
  • FIG. 1 schematically shows a plant for carrying out the method according to the invention with a molding sand mixer 1, which has a flying-mounted, fast-running mixing tool 2.
  • the motor active power is determined in a manner known per se by the detection of the motor voltage and motor currents and consideration of the phase position and fed to a control unit 3.
  • the molding sand mixer 1 is charged via an old-sand balance 4 and an additive balance 5 with solids.
  • the Altsandwaage 4 is fed from an Altsandsilo 6 via, for example, a conveyor belt 7 with used sand to a preset weight value.
  • the temperature of the used sand on the conveyor belt is continuously detected by a temperature sensor 8, from which an average value of the used sand temperature is calculated and fed to the control unit 3.
  • a temperature sensor 8 After the Altsandzugabe in the Altsandwaage 4 a fixed default value Neusand 9 is added from another Neusandsilo.
  • the predetermined amounts of additives such as bentonite 10 and coal dust 11 are weighed in an additive balance 5.
  • a liquid balance 12 a sufficiently large amount of water is introduced, so that the calculated amount of liquid can be added to the molding sand in the mixer 1 completely without interruption by deduction weighing.
  • the individual weights of the solid scales are also dosed gravimetrically via the control unit in order to give a constant total weight of solids in the mixer 1 can.
  • FIG. 2 is shown in the lower part of the diagram, the known relationship between compressibility and moisture content. Depending on the content of the sludge, different degrees of calibration result, which are shifted toward a higher moisture content in the case of a higher slag content SG.
  • FIG. 2 In the upper part of the FIG. 2 is the experimentally determined relationship between engine power MP and moisture of the mixture shown. From a humidity of approx. 2%, the motor output increases linearly with the humidity. The calibration line shown applies to the total weight of the molding sand weigher. Below a humidity of 2%, the relationship between engine power and humidity is highly non-linear due to the not yet fully developed bond between the grains of sand.
  • This range is limited suitable for the control of compressibility, so that preferably an initial moisture of greater than 2% is selected.
  • FIG. 3 schematically shows the moisture correction function as a function of the compressibility difference, which is used for the correction of Wasserzugabemenge in the subsequent batch.
  • the correction function is subdivided into three different sections for both positive and negative differences in compressibility.
  • a first section I the correction function follows an n-th order polynomial with n> 1, with the aim that the small deviations from the nominal value are only very little or not corrected, while larger deviations result in a disproportionately stronger correction. So that the correction does not become too strong in the case of large deviations, the first section I is followed by a second section II with a preferably linear behavior, in which the deviations between compressibility and humidity occur directly in proportion.
  • the correction quantities are limited by an upper limit of the correction value for very large deviations, which are generally not due to long-wave fluctuations but to individual events (see Section III).
  • FIG. 4 is basically the same relationship between engine performance, humidity and compressibility for different Schlämmstoffsuit as in FIG. 2 shown, with the presentation of unnecessary designations for the moisture correction has been omitted.
  • the liquid addition amount is directly determined without further correction function directly from the difference between the determined from the active power MP 1 and the humidity calculated by the Sollverdichtuza for a given sludge content setpoint F Soll .
  • the deviations due to a fluctuating content of sludge between the actual moisture at the end of the charge F 2 which is calculated from the effective power measurement MP 2 shortly before the emptying of the mixer on the calibration degrees, and the target humidity F Soll is in this case via an intervention compensated in the metering control of the solids addition.
  • FIG. 5 The correction function used for this purpose is shown schematically FIG. 5 , While only more or less water has to be added when correcting the addition of water, a distinction must be made between the addition of coarse new sand to reduce the content of sludge and the addition of fines to increase the content of sludge in a correction on the solids addition.
  • FIG. 5 is to be assumed in a positive deviation between the compressibility at the end of the treatment in the mixer V 2 and the Sollverdichtuza of a too low content of sludge, so that this by the addition of fines, eg in the form Bentonite or a mixture of bentonite, coal dust and possibly even filter dust can be compensated.
  • Both the sand addition and fine fraction addition functions of e.g. Bentonite are also here preferably divided into three different sections.
  • the correction function follows an n-th order polynomial with n> 1, so that small deviations from the setpoint value are corrected only very slightly or not at all, while larger deviations result in a disproportionately stronger correction. So that the correction does not become too strong in the case of large deviations, the first section is followed by a second section with a preferably linear behavior in which the deviations between compressibility and humidity occur directly in proportion. So that the control loop does not start to oscillate, for very large deviations, which as a rule do not originate from the long-wave fluctuations but from individual events, are limited by an upwardly limited correction value.

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

Claims (13)

  1. Procédé de préparation de sable de moulage comprenant les étapes suivantes :
    a) division du sable de moulage à préparer en au moins deux quantités de sable de moulage,
    b) chargement d'une première quantité de sable de moulage à préparer dans un mélangeur,
    c) agitation d'un outil mélangeur prévu dans le mélangeur,
    d) mesure de la force nécessaire pour l'agitation de l'outil mélangeur,
    e) détermination de l'aptitude au serrage réelle de la quantité de sable de moulage contenue dans le mélangeur, sur la base de la force mesurée,
    f) détermination de la différence entre l'aptitude au serrage réelle et une aptitude au serrage prévue,
    g) détermination de la quantité d'eau à ajouter à la quantité de sable contenue dans le mélangeur, sur la base de la différence,
    h) addition de la quantité d'eau déterminée sous g) à la quantité de sable de moulage,
    i) agitation de l'outil mélangeur prévu dans le mélangeur pendant une période prédéterminée,
    j) mesure de la force nécessaire pour l'agitation de l'outil mélangeur,
    k) détermination de l'aptitude au serrage réelle de la première quantité de sable de moulage préparée, sur la base de la force mesurée,
    l) détermination de la différence entre l'aptitude au serrage réelle et l'aptitude au serrage prévue,
    m) détermination d'une quantité correctrice d'eau et/ou d'une quantité correctrice de sable neuf et/ou d'une quantité correctrice de boue, sur la base de la différence entre l'aptitude au serrage réelle et l'aptitude au serrage prévue,
    n) répétition des étapes b) à m) avec une deuxième quantité de sable de moulage à préparer, dans laquelle, avant l'étape h) ou simultanément avec cette étape, la quantité correctrice d'eau et/ou la quantité correctrice de sable neuf et/ou la quantité correctrice de boue est ou sont ajoutées à la quantité de sable de moulage à préparer suivante.
  2. Procédé selon la revendication 1, caractérisé en ce que, dans l'étape a), la division s'effectue en au moins trois quantités de sable de moulage, et dans lequel les quantités correctrices déterminées dans l'étape m) sont ajoutées chacune à la quantité de sable de moulage suivante.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la température de la quantité de sable de moulage à préparer est mesurée avant l'étape i) et, sur la base de la différence entre température mesurée et une température de consigne, la quantité d'eau d'évaporation Fevap est calculée et la quantité d'eau d'évaporation FEvap est ajoutée dans le mélangeur avant l'étape i).
  4. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'on fait le vide dans le mélangeur pendant l'étape i).
  5. Procédé selon la revendication 4, caractérisé en ce que la température de la quantité de sable à préparer est mesurée avant l'étape d) et, sur la base de la différence entre la température mesurée et une température de consigne, on calcule la quantité d'eau FCool à ajouter qui est nécessaire pour ramener la quantité de sable de moulage à la température de consigne par un refroidissement par évaporation.
  6. Procédé selon une des revendications 1 à 5, caractérisé en ce que, pour la deuxième quantité de sable de moulage et pour chacune des quantités suivantes, on ajoute avant l'étape d) au moins 1/10, de préférence plus de 5/10 et, de façon particulièrement préférée, entre 8/10 et 9/10, de la quantité d'eau déterminée dans l'étape g) pour la première quantité de sable de moulage ou pour la quantité de sable de moulage respectivement précédente, cette fraction étant le cas échéant corrigée de la quantité correctrice d'eau déterminée dans l'étape m).
  7. Procédé selon une des revendications 1 à 6, caractérisé en ce que la période prédéterminée est la même pour toutes les quantités de sable de moulage à préparer.
  8. Procédé selon une des revendications 1 à 7, caractérisé en ce que, dans l'étape m), on calcule la quantité correctrice d'eau.
  9. Procédé selon la revendication 8, caractérisé en ce que la quantité correctrice d'eau est déterminée au moyen d'une fonction de correction linéaire.
  10. Procédé selon la revendication 8 ou 9, caractérisé en ce que la quantité correctrice d'eau est limitée par une quantité d'eau limite prédéterminée.
  11. Procédé selon une des revendications 8 à 10, caractérisé en ce qu'en présence de petites différences mesurées entre l'aptitude au serrage réelle et l'aptitude au serrage prévue, la quantité correctrice d'eau est déterminée au moyen d'une fonction de correction d'ordre n, avec n>1.
  12. Procédé selon une des revendications 1 à 11, caractérisé en ce que, dans l'étape m), une quantité correctrice de sable neuf ou une quantité correctrice de boue est déterminée sur la base de la différence entre l'aptitude au serrage réelle et l'aptitude au serrage prévue, et la quantité correctrice de sable neuf ou la quantité correctrice de boue est ajoutée à la quantité de sable de moulage à préparer suivante, de préférence dans l'étape b).
  13. Procédé selon la revendication 12, caractérisé en ce que, dans l'étape m), une quantité correctrice d'eau est déterminée sur la base de la différence entre l'aptitude au serrage réelle et l'aptitude au serrage prévue, et la quantité correctrice d'eau est prise en compte pour la quantité de sable de moulage à préparer suivante, de préférence lors de l'addition de la quantité d'eau déterminée sous g) à la quantité de sable de moulage de l'étape h).
EP20080736404 2007-06-11 2008-04-18 Procédé de préparation de sable de fonderie Not-in-force EP2155417B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200831446T SI2155417T1 (sl) 2007-06-11 2008-04-18 Postopek za pripravo livarskega peska
PL08736404T PL2155417T3 (pl) 2007-06-11 2008-04-18 Sposób przygotowania masy formierskiej

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007027298A DE102007027298A1 (de) 2007-06-11 2007-06-11 Verfahren zur Aufbereitung von Formsand
PCT/EP2008/054769 WO2008151874A1 (fr) 2007-06-11 2008-04-18 Procédé de préparation de sable de fonderie

Publications (2)

Publication Number Publication Date
EP2155417A1 EP2155417A1 (fr) 2010-02-24
EP2155417B1 true EP2155417B1 (fr) 2015-04-22

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US (1) US8225844B2 (fr)
EP (1) EP2155417B1 (fr)
JP (1) JP2010528873A (fr)
KR (1) KR101477513B1 (fr)
CN (1) CN101715376B (fr)
BR (1) BRPI0812459B1 (fr)
DE (1) DE102007027298A1 (fr)
DK (1) DK2155417T3 (fr)
MX (1) MX2009012603A (fr)
PL (1) PL2155417T3 (fr)
RU (1) RU2476289C2 (fr)
SI (1) SI2155417T1 (fr)
UA (1) UA99462C2 (fr)
WO (1) WO2008151874A1 (fr)
ZA (1) ZA200908265B (fr)

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DE102008054842A1 (de) * 2008-12-17 2010-07-01 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Mischer
DE102010018751B4 (de) * 2010-04-29 2015-08-13 Laempe & Mössner GmbH Verfahren und Vorrichtung zur Herstellung von Formen oder Kernen insbesondere für Gießereizwecke
RU2478020C2 (ru) * 2011-05-24 2013-03-27 Закрытое Акционерное Общество "Литаформ" Способ приготовления формовочной смеси и устройство для приготовления формовочной смеси
US10144054B2 (en) 2012-06-13 2018-12-04 Sintokogio, Ltd. Mixing and water adjusting method for foundry sand
CN104907489A (zh) * 2015-05-28 2015-09-16 芜湖诚拓汽车零部件有限公司 铸砂研磨混合系统
CN105642825A (zh) * 2016-02-01 2016-06-08 青岛意特机械有限公司 粘土砂混砂机
CN107377870A (zh) * 2017-08-14 2017-11-24 湖北亚钢金属制造有限公司 一种铸造用混砂机
FI128118B (fi) 2017-10-25 2019-10-15 Finn Recycling Oy Hiekan terminen elvytys tai puhdistus
CN108188344B (zh) * 2018-01-30 2023-01-06 共享智能装备有限公司 一种3d打印机用的集成砂供应系统
CN109261894A (zh) * 2018-11-13 2019-01-25 江苏锐美汽车零部件有限公司 一种新能源汽车电机机壳砂芯制作配比工艺及其实现方法
CN109530613B (zh) * 2018-12-05 2023-09-19 常州好迪机械有限公司 一种混砂装置使用方法
CN114985676B (zh) * 2022-05-30 2023-08-08 重庆林洲机械制造有限公司 一种连续混砂机型砂重量监测与液料校正系统及方法

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US8225844B2 (en) 2012-07-24
CN101715376B (zh) 2012-05-09
KR101477513B1 (ko) 2014-12-30
JP2010528873A (ja) 2010-08-26
WO2008151874A1 (fr) 2008-12-18
EP2155417A1 (fr) 2010-02-24
BRPI0812459A2 (pt) 2014-12-02
KR20100020491A (ko) 2010-02-22
RU2476289C2 (ru) 2013-02-27
RU2010100347A (ru) 2011-07-20
DE102007027298A1 (de) 2008-12-18
CN101715376A (zh) 2010-05-26
SI2155417T1 (sl) 2015-07-31
US20100181042A1 (en) 2010-07-22
UA99462C2 (uk) 2012-08-27
BRPI0812459B1 (pt) 2016-06-14
PL2155417T3 (pl) 2015-10-30
DK2155417T3 (en) 2015-07-13
ZA200908265B (en) 2011-02-23
MX2009012603A (es) 2009-12-11

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