WO2008151874A1 - Verfahren zur aufbereitung von formsand - Google Patents
Verfahren zur aufbereitung von formsand Download PDFInfo
- Publication number
- WO2008151874A1 WO2008151874A1 PCT/EP2008/054769 EP2008054769W WO2008151874A1 WO 2008151874 A1 WO2008151874 A1 WO 2008151874A1 EP 2008054769 W EP2008054769 W EP 2008054769W WO 2008151874 A1 WO2008151874 A1 WO 2008151874A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- molding sand
- sand
- amount
- water
- compressibility
- Prior art date
Links
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 archetypal 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 the surface of the quartz bodies, the type and quantity of the 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 molding sand can be recycled and fed back to the molding cycle, since the binder coats are still largely effective, so that only water and optionally binder must be supplied. Part of the used sand is removed from the cycle and replaced with fresh feedstock. Frequently, clay-bound molding sands are used, which are usually returned to a conditioning process after the casting process, where the used sand is again mixed in a sufficient amount of water, binder (eg bentonite), additives (eg coal dust) and new sand.
- binder eg bentonite
- additives eg 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 compressibility and further measured variables such as, for example, the compressive strength and / or shear strength are generally determined directly with a mixer downstream from the mixer or directly from the mixer.
- the moisture content of the used sand in the mixer for correcting the amount of water added is determined directly via a moisture sensor and corrected on the basis of the detected compressibility and moisture values in the addition of water and addition of aggregate to achieve a constant molding sand quality of the processed molding sand.
- No. 3,838,847 describes a further developed process of DE 1947566, in which a liquid which is continuously flowed through with molding sand and subjected to the horizontal inclined conical drum mixer is subjected to liquid in dependence on the torque of a mixing tool working countercurrently to the mixing container, so that the torque applied to the mixing tool is constant.
- JP 56053844 describes a method for the correction of the molding sand quality by fluctuating solids weighing, resulting from the timed addition of used sand in a storage tank by active power measurement on a Kollerantrieb.
- the humidity and the bentonite content of the used sand are simultaneously determined in a muller 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 corrected.
- 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 simultaneous correction of two operating variables, humidity and bentonite content, which are also dependent on one another, based on only one measured variable engine power difference with simultaneously non-constant capacity in the mixer and fluctuating used sand mixtures inevitably leads to greater than smaller variations in the molding sand quality.
- 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 method for processing molding sand comprising the following steps: a) dividing the molding sand to be treated into at least two molding sand mixtures, b) adding a first molding sand mixture to a mixer, c) moving a mixing tool provided in the mixer, d) Measuring the force necessary for the movement of the mixing tool, e) determining the actual compressibility of the molding sand contained in the mixer from the measured force, f) determining the difference between the actual compressibility and a SoII compressibility, g) determining the in the mixer i) moving the mixing tool provided in the mixer during a predetermined period of time, j) measuring the force necessary for the movement of the mixing tool, k) determining the Is-compactability of the processed first molding sand from the g empressive power,
- 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 of the force required, but it is quite sufficient to measure a size that is a measure of the force required, since the method is less the force, but rather the compressibility of the molding sands 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 S ⁇ ⁇ the necessary target moisture F S ⁇ ⁇ calculated and compensated for the resulting moisture difference AF 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.
- a second measured value MP 2 for the effective power of the mixing tool.
- the compressibility difference AV 2 resulting from the deviation is then converted by means of a defined correction function into a moisture correction value F korr , which is correspondingly taken into account in the subsequently prepared molding sand quantity in the determination of the necessary quantity of added water.
- 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 compactability is checked at the end of the treatment and, if a deviation from the nominal value is determined, the preparation of future molding sand quantities is adapted 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 moisture loss is in a preferred embodiment of the temperature of the used sand on an energy balance on the expected moisture reduction by evaporation closed and this additional moisture amount F Ev a 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 is then additionally added to the amount of evaporation water, which in this case is made up of the final sand.
- Temperature of the processed molding sand which corresponds to the set final pressure, results in exactly the amount of water F CoO ⁇ fed to the preparation, which is necessary to cool the molding sand from its actual temperature to the target 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 via old sand belts, is thereby detected on the way to the scale and used for the subsequent water correction to compensate for the amount of evaporation water or when reprocessing under vacuum to determine the amount of water that is used for evaporative cooling.
- the temperature-dependent water loss F Ev a P (T) is calculated in a known manner via an energy balance by evaporation over the previously measured old sand temperature or from the final boiling point of the vacuum treatment via the vapor pressure curve of the water 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 compactability 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.
- 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 treatment 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 additive correction follows a linear relationship, while in a third section, which directly adjoins the second section, it is limited to a specified maximum value.
- the laubsbestim- mend on the basis of determined in the previously processed molding sand amount of water at the same time with the addition of the used sand or the new sand and the Additives in the mixer a part, 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 determination and addition of the amount of residual water according to equation (1), which compensates in this case, only the missing 10 to 20%, just before the emptying takes place in the sum of constant wet mixing time, the second active power measurement, so that again the actual moisture or actual compactability can be determined and is available for the correction of Wasserzugabemenge in the subsequent molding sand.
- FIG. 1 shows a schematic representation of a plant for carrying out the process
- FIG. 2 shows a schematic diagram with the experimentally determined relationship between engine power and humidity or the known relationship between moisture and compressibility of foundry sand at different slurry contents
- FIG. 3 shows a schematic diagram of the moisture correction function subdivided into three sections as a function of the difference between desired and actual compressibility
- FIG. 4 shows a further schematic diagram with the experimentally determined relationship between engine power and humidity or the known relationship between moisture and compressibility of foundry sand at different slurry contents and
- FIG. 5 is a schematic diagram of the three-section divided solids correction function as a function of the difference between the target and actual compressibility
- FIG. 1 shows a schematic of a plant for carrying out the process 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 shows the known relationship between compressibility and moisture content in the lower part of the diagram.
- different degrees of calibration result, which are shifted toward a higher moisture content in the case of a higher slag content SG.
- FIG. 2 shows the experimentally determined relationship between engine power MP and moisture of the mixture. 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 moisture is highly non-linear due to the not yet fully developed bond between the sand grains.
- This range is limited suitable for the control of compressibility, so that preferably an initial moisture of greater than 2% is selected. This can be ensured, for example, by adding pre-water in the amount of 80-90% of the amount of water added to the previous molding sand (also referred to as a previous batch) that occurs simultaneously with the addition of the solids to the mixer.
- FIG. 3 schematically shows the moisture correction function as a function of the compressibility difference which is used for the correction of the water addition amount in the subsequent charge.
- 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 for 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 take place 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 shows in principle the same relationship between engine power, humidity and compressibility for different contents of sludge as in FIG. 2, wherein the description of unnecessary designations for the moisture correction was 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 given slurry content F S ⁇ ⁇ directly.
- 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 S ⁇ ⁇ in this case via a Intervention in the metering control of the solids addition compensated.
- the correction function used for this purpose is shown schematically in Figure 5.
- 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.
Abstract
Description
Claims
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010511554A JP2010528873A (ja) | 2007-06-11 | 2008-04-18 | 成形砂処理のための方法 |
CN2008800195017A CN101715376B (zh) | 2007-06-11 | 2008-04-18 | 处理型砂的方法 |
SI200831446T SI2155417T1 (sl) | 2007-06-11 | 2008-04-18 | Postopek za pripravo livarskega peska |
RU2010100347/02A RU2476289C2 (ru) | 2007-06-11 | 2008-04-18 | Способ приготовления формовочной смеси |
EP20080736404 EP2155417B1 (de) | 2007-06-11 | 2008-04-18 | Verfahren zur aufbereitung von formsand |
US12/663,910 US8225844B2 (en) | 2007-06-11 | 2008-04-18 | Method for processing moulding sand |
MX2009012603A MX2009012603A (es) | 2007-06-11 | 2008-04-18 | Metodo para preparar arena de moldear. |
PL08736404T PL2155417T3 (pl) | 2007-06-11 | 2008-04-18 | Sposób przygotowania masy formierskiej |
BRPI0812459A BRPI0812459B1 (pt) | 2007-06-11 | 2008-04-18 | método para o processamento de areia de moldagem |
DK08736404.8T DK2155417T3 (en) | 2007-06-11 | 2008-04-18 | A method for processing the molding sand. |
ZA2009/08265A ZA200908265B (en) | 2007-06-11 | 2009-11-23 | Method for processing moulding sand |
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 |
DE102007027298.9 | 2007-06-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008151874A1 true WO2008151874A1 (de) | 2008-12-18 |
Family
ID=39619037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/054769 WO2008151874A1 (de) | 2007-06-11 | 2008-04-18 | Verfahren zur aufbereitung von formsand |
Country Status (15)
Country | Link |
---|---|
US (1) | US8225844B2 (de) |
EP (1) | EP2155417B1 (de) |
JP (1) | JP2010528873A (de) |
KR (1) | KR101477513B1 (de) |
CN (1) | CN101715376B (de) |
BR (1) | BRPI0812459B1 (de) |
DE (1) | DE102007027298A1 (de) |
DK (1) | DK2155417T3 (de) |
MX (1) | MX2009012603A (de) |
PL (1) | PL2155417T3 (de) |
RU (1) | RU2476289C2 (de) |
SI (1) | SI2155417T1 (de) |
UA (1) | UA99462C2 (de) |
WO (1) | WO2008151874A1 (de) |
ZA (1) | ZA200908265B (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010076120A1 (de) * | 2008-12-17 | 2010-07-08 | Maschinenfabrik Gustav Eirich Gmbh & Co. Kg | Mischer mit drehbarem mischbehälter |
CN108188344A (zh) * | 2018-01-30 | 2018-06-22 | 宁夏共享模具有限公司 | 一种3d打印机用的集成砂供应系统 |
CN109530613A (zh) * | 2018-12-05 | 2019-03-29 | 常州好迪机械有限公司 | 一种混砂装置 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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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 |
DE112013002952B4 (de) * | 2012-06-13 | 2023-02-09 | Sintokogio, Ltd. | Misch- und Einstellverfahren für Formsand |
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 |
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 |
CN117139555A (zh) * | 2022-05-30 | 2023-12-01 | 重庆林洲机械制造有限公司 | 一种砂型的造型方法 |
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DE2053936A1 (en) * | 1969-11-05 | 1971-05-13 | Ahrenberg K | Automatic moisture control in milling foundry - sands |
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US3838847A (en) * | 1971-01-21 | 1974-10-01 | Fischer Ag Georg | Drum mixer for continuous processing of a granular bulk material |
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JPS57204846U (de) * | 1981-06-22 | 1982-12-27 | ||
JPS59166342A (ja) * | 1983-03-11 | 1984-09-19 | Komatsu Ltd | 鋳物砂のコンパクタビリテイ制御方法 |
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-
2007
- 2007-06-11 DE DE102007027298A patent/DE102007027298A1/de not_active Withdrawn
-
2008
- 2008-04-18 PL PL08736404T patent/PL2155417T3/pl unknown
- 2008-04-18 CN CN2008800195017A patent/CN101715376B/zh not_active Expired - Fee Related
- 2008-04-18 DK DK08736404.8T patent/DK2155417T3/en active
- 2008-04-18 UA UAA200913776A patent/UA99462C2/uk unknown
- 2008-04-18 JP JP2010511554A patent/JP2010528873A/ja active Pending
- 2008-04-18 BR BRPI0812459A patent/BRPI0812459B1/pt not_active IP Right Cessation
- 2008-04-18 KR KR1020097027277A patent/KR101477513B1/ko active IP Right Grant
- 2008-04-18 SI SI200831446T patent/SI2155417T1/sl unknown
- 2008-04-18 US US12/663,910 patent/US8225844B2/en not_active Expired - Fee Related
- 2008-04-18 WO PCT/EP2008/054769 patent/WO2008151874A1/de active Application Filing
- 2008-04-18 MX MX2009012603A patent/MX2009012603A/es active IP Right Grant
- 2008-04-18 EP EP20080736404 patent/EP2155417B1/de not_active Not-in-force
- 2008-04-18 RU RU2010100347/02A patent/RU2476289C2/ru not_active IP Right Cessation
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2009
- 2009-11-23 ZA ZA2009/08265A patent/ZA200908265B/en unknown
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DE1301874B (de) * | 1967-10-03 | 1969-08-28 | Ahrenberg Kurt | Befeuchtungsverfahren und -vorrichtung fuer Mischgueter, insbesondere Giessereiformsande |
DE1947566A1 (de) * | 1968-10-07 | 1970-08-27 | Fischer Ag Georg | Verfahren zur Regelung der Feuchtigkeit von koernigen Massen,insbesondere von Formsand und Vorrichtung zur Durchfuehrung des Verfahrens |
CH517541A (de) * | 1968-11-15 | 1972-01-15 | Ahrenberg Kurt | Verfahren zur automatischen Befeuchtung von Mischgütern und Vorrichtung zur Durchführung des Verfahrens |
DE2053936A1 (en) * | 1969-11-05 | 1971-05-13 | Ahrenberg K | Automatic moisture control in milling foundry - sands |
US3838847A (en) * | 1971-01-21 | 1974-10-01 | Fischer Ag Georg | Drum mixer for continuous processing of a granular bulk material |
JPS5653844A (en) * | 1979-10-08 | 1981-05-13 | Toyoda Autom Loom Works Ltd | Preparation of molding sand |
DE3220662A1 (de) * | 1982-06-02 | 1983-12-08 | Hubert Eirich | Verfahren zur automatischen regelung von giessereisandaufbereitungsanlagen |
DE19536803A1 (de) * | 1994-09-30 | 1996-04-04 | Mazda Motor | Verfahren und Vorrichtung zum Regenerieren von Formsand |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010076120A1 (de) * | 2008-12-17 | 2010-07-08 | Maschinenfabrik Gustav Eirich Gmbh & Co. Kg | Mischer mit drehbarem mischbehälter |
US9694331B2 (en) | 2008-12-17 | 2017-07-04 | Maschinenfabrik Gustav Eirich Gmbh & Co. Kg | Mixer having rotating mixing container |
CN108188344A (zh) * | 2018-01-30 | 2018-06-22 | 宁夏共享模具有限公司 | 一种3d打印机用的集成砂供应系统 |
CN109530613A (zh) * | 2018-12-05 | 2019-03-29 | 常州好迪机械有限公司 | 一种混砂装置 |
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 |
Also Published As
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DK2155417T3 (en) | 2015-07-13 |
US8225844B2 (en) | 2012-07-24 |
KR101477513B1 (ko) | 2014-12-30 |
EP2155417A1 (de) | 2010-02-24 |
MX2009012603A (es) | 2009-12-11 |
RU2476289C2 (ru) | 2013-02-27 |
UA99462C2 (uk) | 2012-08-27 |
JP2010528873A (ja) | 2010-08-26 |
SI2155417T1 (sl) | 2015-07-31 |
EP2155417B1 (de) | 2015-04-22 |
RU2010100347A (ru) | 2011-07-20 |
CN101715376B (zh) | 2012-05-09 |
BRPI0812459B1 (pt) | 2016-06-14 |
BRPI0812459A2 (pt) | 2014-12-02 |
CN101715376A (zh) | 2010-05-26 |
US20100181042A1 (en) | 2010-07-22 |
PL2155417T3 (pl) | 2015-10-30 |
KR20100020491A (ko) | 2010-02-22 |
DE102007027298A1 (de) | 2008-12-18 |
ZA200908265B (en) | 2011-02-23 |
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