EP1225991A1 - Method for conditioning foundry moulding sand and a device therefor - Google Patents
Method for conditioning foundry moulding sand and a device thereforInfo
- Publication number
- EP1225991A1 EP1225991A1 EP00974309A EP00974309A EP1225991A1 EP 1225991 A1 EP1225991 A1 EP 1225991A1 EP 00974309 A EP00974309 A EP 00974309A EP 00974309 A EP00974309 A EP 00974309A EP 1225991 A1 EP1225991 A1 EP 1225991A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- molding sand
- water
- mixer
- sand
- temperature
- 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.)
- Granted
Links
- 239000004576 sand Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000000465 moulding Methods 0.000 title abstract description 10
- 230000003750 conditioning effect Effects 0.000 title abstract 5
- 239000003110 molding sand Substances 0.000 claims description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 49
- 239000000203 mixture Substances 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000009835 boiling Methods 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 41
- 239000011230 binding agent Substances 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/54—Mixing liquids with solids wetting solids
-
- 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
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F2035/99—Heating
Definitions
- the present invention relates to a method for processing molding sand, the processing being carried out at least partially under vacuum. Furthermore, the present invention also relates to an apparatus for carrying out the method
- the preparation of sand for the production of casting molds has the aim of producing the correct mixture ratio of the grain sizes as well as the ratio of the proportions of quartz sand, binder, coal dust as well as old and new sand to homogenize the mixture and thereby to coat the grain with the binder largely the right one Adjust moisture content, remove unwanted components, set the correct temperature of the molding sand and finally send the finished sand to the consumer
- the used sand has an elevated temperature of, for example, between 100 ° C and 140 ° C, since sand temperatures above about 50 ° C can pose great problems for the molding machine and, if the temperature is too high, due to uncontrollable evaporation losses on the route between the mixer and the molding system, moisture fluctuations in the finished sand occur, the sand must be cooled in this case
- the cooler of DE 29 52 403 C2 is expediently used only when used sand is returned to the mixer at such a temperature that cooling is required.
- the molding sand mixer is operated without a vacuum. Even if used sand is processed with great effort without a vacuum, it still differs from molding sand that was processed with a vacuum.
- the present invention is therefore based on the object of providing a method and a device which ensure processing of the molding sand under vacuum regardless of the temperature of the used sand, provides a cooled molding sand for further processing, and the recycled molding sand provides consistently high quality values regardless of the temperature of the molding sand.
- This object is achieved in that molding sand which has not been cooled under vacuum is heated before processing or during processing and is then cooled under the influence of vacuum.
- Preheating ensures that old sand that has already cooled down can be processed using vacuum technology.
- the temperature of the molding sand can preferably be set as precisely as possible to the temperature T min so that Processing can take place under constant conditions, and the processed molding sand has a constant extremely high quality
- Temperature and / or humidity can be measured either on the old sand track or in the mixer using suitable probes
- the molding sand can be heated, for example, with the help of moisture-saturated hot air, heat radiation or microwaves
- preferred embodiments of the present invention provide that the molding sand is heated by adding hot water and / or hot steam
- a temperature measurement of the old sand is carried out in front of or in the mixer. If the detected temperature is above the minimum temperature set for vacuum cooling, the sand is processed and cooled in the known manner, but if the temperature of the old sand is below the is set, hot steam is preferably blown into the cold molding sand.This steam condenses in the mixer and heats up the molding sand to the desired minimum temperature. As soon as the set temperature is reached, the steam supply is switched off and the molding sand is brought to the desired final temperature by applying a vacuum chilled
- the amount of hot steam added is preferably kept as low as possible
- a particularly expedient embodiment of the present invention was that fa "s d'e ⁇ ' r e rn r, e r 3t ⁇ J r d
- the evaporation can be continued under vacuum until the desired final moisture is reached
- the hot steam is preferably fed into the molding sand inside the mixer, it is also possible to add the hot steam on the transport or storage line or in a pile.
- the steam supply in the mixer has the advantage that the mixed material content wetted with steam is constant There is movement and therefore comes into contact with the parts that have not yet been wetted with great certainty. The mixture thus mixes well with the water vapor
- the binding clay usually bentonite
- the binding clay is apparently better penetrated by the water and activated.
- the better penetration of the binder by water also results in a more uniform moisture distribution in the binder shell and, consequently, better flowability of the molding sand when filling the form
- a hollow shaft or another machine part protruding into the mix e.g. a wall scraper
- a hollow shaft or another machine part protruding into the mix e.g. a wall scraper
- the steam is preferably supplied through a lateral opening in the lower wall area of the mixing container
- the moisture content and the temperature of the used sand are measured and compared with the specified target values of the finished sand the amount of water required for cooling and moistening the molding sand is calculated and supplied
- the amount of steam required for heating is preferably determined by comparing the inlet temperature with the predetermined minimum temperature. In the event that the amount of steam to be added is not sufficient to achieve the desired moisture content of the finished sand, process water is also added
- An alternative way to determine the amount of steam to be added is to set a pressure in the mixer before or during the steam addition at which the boiling temperature of the water corresponds to the desired final temperature. Steam is added until the pressure or the temperature of the Water-steam mixture rises above the material to be mixed The added water vapor condenses in the material to be mixed as long as the temperature of the material to be mixed is below the desired minimum temperature When the temperature of the molding sand reaches the minimum temperature, the condensation process ends and the vapor pressure above the material to be mixed rises This steam pressure can be determined The abrupt rise in steam pressure is then an indication that enough hot steam has been supplied
- the rise in steam pressure may not be particularly pronounced, especially in the case of large-sized vacuum pumps.
- it is advantageous to measure the temperature of the steam which in general leads to a condenser via a discharge pipe, and increases when the condensation process in the mix ends Temperature in the pipe strongly on This can also be seen as an indication that sufficient water vapor has been introduced into the mix
- the amount of water required for the formability of the sand or for the desired moisture content must be determined separately
- a particularly energy-saving embodiment of the present invention provides that the molding sand is heated if necessary by suitable mixing with hot used sand.
- hot used sand it is possible for hot used sand to be stored in a silo and mixed with cold used sand if necessary that the temperature of the old sand mixture is increased to the minimum temperature and therefore little or no heating is required by adding steam or hot water
- Figure 1 is a schematic representation of the inventive method and the device
- the mixer 1 can be clearly seen at the bottom left. Old and possibly also new sand is fed in under 2 and, if necessary, filter dust, bentonite and coal dust 3 are added. The temperature T ⁇ st and the moisture content of the old sand are added to the mixer before filling 1 determined by the temperature sensor 13 and the moisture sensor 14
- a programmable controller (not shown) compares the temperature T, st with a predetermined minimum temperature T min If the temperature of the old sand falls below the predetermined minimum temperature, hot steam is injected into the mix via the steam supply 12 until the mix reaches the specified minimum temperature
- the quantity can be calculated, for example, from T ⁇ st (and of course the quantity of the material to be mixed).
- a further temperature sensor can be arranged in the mixer, which detects the temperature of the material to be mixed, so that the addition of the hot steam is stopped when the minimum temperature is reached
- Another possibility for determining the amount of steam to be added is to create a vacuum in the mixer cooler, so that the set (under) pressure pressures the boiling temperature of water to the specified minimum temperature.
- the pressure in the mixer cooler is gradually reduced using the vacuum unit 9 until the boiling point of the water corresponds to the desired final temperature (e.g. 30 - 40 ° C).
- the water in the mixture evaporates in part and that thereby necessary evaporation heat is withdrawn from the mixed material.
- the evaporated water is fed via line 6 to a condenser 7.
- Another water circuit is responsible for cooling the vacuum unit 9 and the heat exchanger 11 and therefore has a cooling tower 10.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19945569 | 1999-09-23 | ||
| DE19945569A DE19945569A1 (en) | 1999-09-23 | 1999-09-23 | Process for processing foundry mold sand and device therefor |
| PCT/DE2000/003117 WO2001021341A1 (en) | 1999-09-23 | 2000-09-06 | Method for conditioning foundry moulding sand and a device therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1225991A1 true EP1225991A1 (en) | 2002-07-31 |
| EP1225991B1 EP1225991B1 (en) | 2004-11-10 |
Family
ID=7923007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00974309A Expired - Lifetime EP1225991B1 (en) | 1999-09-23 | 2000-09-06 | Method of reconditioning foundry moulding sand |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6926063B1 (en) |
| EP (1) | EP1225991B1 (en) |
| JP (1) | JP4948729B2 (en) |
| AU (1) | AU1267701A (en) |
| DE (3) | DE19945569A1 (en) |
| DK (1) | DK1225991T3 (en) |
| ES (1) | ES2226939T3 (en) |
| WO (1) | WO2001021341A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10030675A1 (en) * | 2000-06-23 | 2002-01-03 | Eirich Maschf Gustav | Method and device for processing molding sand |
| DE102010018751B4 (en) * | 2010-04-29 | 2015-08-13 | Laempe & Mössner GmbH | Method and device for producing molds or cores, in particular for foundry purposes |
| CN114534593A (en) * | 2022-02-16 | 2022-05-27 | 安徽善和生物科技有限公司 | Probiotics powder solid beverage mixing arrangement |
| CN117564217B (en) * | 2023-11-21 | 2024-05-28 | 浙江海帆阀业有限公司 | Valve body casting equipment capable of automatically screening |
| CN117960994B (en) * | 2024-04-02 | 2024-06-04 | 福建台屹精密机械有限公司 | Sand mould casting equipment |
Family Cites Families (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2456769A (en) * | 1944-02-16 | 1948-12-21 | Herbert S Simpson | Method of reclaiming foundry sand |
| US2593327A (en) * | 1947-11-03 | 1952-04-15 | Herbert S Simpson | Sand cooling device |
| US2628080A (en) * | 1950-09-22 | 1953-02-10 | Patterson Foundry & Machine Co | Jacketed conical blender |
| GB701108A (en) * | 1950-10-11 | 1953-12-16 | Courtaulds Ltd | Improvements in and relating to churns for the production of viscose |
| US3521863A (en) * | 1968-02-01 | 1970-07-28 | Robert A Graham | Centrifugal mixer having vacuum means |
| CH490110A (en) * | 1969-02-28 | 1970-05-15 | Spemag Ag | Mixer |
| FR2402472A1 (en) * | 1977-09-13 | 1979-04-06 | Alsthom Atlantique | APPARATUS FOR HOLDING SOLID PRODUCTS IN SUSPENSION AND METHOD OF USE |
| JPS5831259B2 (en) * | 1979-01-24 | 1983-07-05 | 株式会社日立製作所 | Foundry sand temperature control device |
| DE2952403C2 (en) * | 1979-12-27 | 1984-08-23 | Alfelder Maschinen- und Modell-Fabrik Künkel, Wagner & Co KG, 3220 Alfeld | Method and device for processing, especially cooling and mixing of molding sand |
| DE3309379A1 (en) * | 1983-03-16 | 1984-09-20 | Hubert Eirich | METHOD FOR REGENERATING FOUNDRY SAND AND DEVICE FOR IMPLEMENTING THE METHOD |
| US4772434A (en) * | 1986-10-03 | 1988-09-20 | The Dial Corporation | Soap making process |
| US4709862A (en) * | 1987-01-30 | 1987-12-01 | Leidel Dieter S | Method of reclaiming green sand |
| SE466883B (en) * | 1989-01-27 | 1992-04-27 | Alfa Laval Food Eng Ab | DEVICE FOR HEAT TREATMENT OF PARTICLE-SIZED MATERIALS INCLUDING PIPE STORES CONNECTED TO CALLS |
| FR2654584B1 (en) * | 1989-11-20 | 1992-05-22 | Chauveau Jean Marie | REACTOR FOR TREATING A COCOA LIQUOR AND ITS DERIVATIVES. |
| DE4190731D2 (en) * | 1990-03-20 | 1992-06-25 | Kuettner Gmbh & Co Kg Dr | Verfahren zum regenieren von giesserei-altsand |
| DE4411201A1 (en) * | 1994-03-31 | 1995-10-05 | Schuerenberg Beton Spritzmasch | Fine material vortex mixer |
| US5816312A (en) * | 1994-09-30 | 1998-10-06 | Mazda Motor Corporation | Method of and apparatus for reclaiming foundry sand |
| US5603567A (en) * | 1995-02-17 | 1997-02-18 | Blentech Corporation | Coaxial cryogenic injection system |
| DE19512593A1 (en) * | 1995-04-04 | 1996-10-10 | Eirich Maschf Gustav | Method and device for cooling foundry sand |
| JP3705627B2 (en) * | 1995-09-13 | 2005-10-12 | マシーネンファブリーク・グスタフ・アイリッヒ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング・ウント・コムパニー・コマンディットゲゼルシャフト | Casting sand recycling method and apparatus |
| US5626421A (en) * | 1996-05-28 | 1997-05-06 | Campbell; Craig C. | Blender construction |
| JP3030260B2 (en) * | 1997-03-10 | 2000-04-10 | マツダ株式会社 | Casting sand recycling method and apparatus |
| DE10030675A1 (en) * | 2000-06-23 | 2002-01-03 | Eirich Maschf Gustav | Method and device for processing molding sand |
| KR100402412B1 (en) * | 2001-10-25 | 2003-11-01 | 기원금속(주) | Regenerating apparatus of molding sand, and regenerating method thereof |
-
1999
- 1999-09-23 DE DE19945569A patent/DE19945569A1/en not_active Withdrawn
-
2000
- 2000-09-06 DE DE50008619T patent/DE50008619D1/en not_active Expired - Lifetime
- 2000-09-06 EP EP00974309A patent/EP1225991B1/en not_active Expired - Lifetime
- 2000-09-06 ES ES00974309T patent/ES2226939T3/en not_active Expired - Lifetime
- 2000-09-06 DE DE10082836T patent/DE10082836D2/en not_active Withdrawn - After Issue
- 2000-09-06 AU AU12677/01A patent/AU1267701A/en not_active Abandoned
- 2000-09-06 WO PCT/DE2000/003117 patent/WO2001021341A1/en not_active Ceased
- 2000-09-06 DK DK00974309T patent/DK1225991T3/en active
- 2000-09-06 US US10/088,888 patent/US6926063B1/en not_active Expired - Fee Related
- 2000-09-06 JP JP2001524753A patent/JP4948729B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0121341A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1267701A (en) | 2001-04-24 |
| DK1225991T3 (en) | 2004-12-13 |
| JP4948729B2 (en) | 2012-06-06 |
| DE50008619D1 (en) | 2004-12-16 |
| US6926063B1 (en) | 2005-08-09 |
| DE10082836D2 (en) | 2002-11-07 |
| ES2226939T3 (en) | 2005-04-01 |
| WO2001021341A1 (en) | 2001-03-29 |
| JP2003509219A (en) | 2003-03-11 |
| DE19945569A1 (en) | 2001-03-29 |
| EP1225991B1 (en) | 2004-11-10 |
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