EP0095657A2 - Procédé de régulation automatique des installations de préparation de sable de fonderie - Google Patents
Procédé de régulation automatique des installations de préparation de sable de fonderie Download PDFInfo
- Publication number
- EP0095657A2 EP0095657A2 EP83104897A EP83104897A EP0095657A2 EP 0095657 A2 EP0095657 A2 EP 0095657A2 EP 83104897 A EP83104897 A EP 83104897A EP 83104897 A EP83104897 A EP 83104897A EP 0095657 A2 EP0095657 A2 EP 0095657A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- compressibility
- sand
- moisture
- stage
- measured
- 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
Images
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
Definitions
- the invention relates to a method for the automatic control of foundry preparation plants, in which the moisture and the compressibility of the foundry sand are measured.
- Clay-bound foundry sand is usually made after its use, i.e. after pouring, returned to a processing plant, where sufficient amounts of water, binders (e.g. bentonite), additives (e.g. coal dust, starch) and new sand are added to the sand.
- binders e.g. bentonite
- additives e.g. coal dust, starch
- the aim here is to proportion the individual additives so that the foundry sand has a uniform quality.
- the load on the foundry sand fluctuates depending on the respective production program, so that foundry sand with fluctuating properties or different sand characteristics is constantly returned to the processing plant.
- the goal of a well-functioning preparation is therefore always to recognize the fluctuations in the old sand and to add the additives accordingly during the mixing process.
- the second-mentioned combined measuring system takes into account not only the moisture of the sand but also its compressibility or deformability, which in turn are related to the bulk density, but disadvantageously the measuring device has to be readjusted when the sand characteristics change. It goes without saying that time-consuming measures are required for this.
- the object of the invention is therefore to create a method of the type mentioned at the beginning with which the causes of the change in the compressibility are determined and a re-calibration is possible taking these causes into account.
- This object is achieved in that a setpoint for both a given sand characteristic for the compressibility as well as for the moisture of the sand, the actual value of the compressibility is measured in a first stage and is brought to the moisture setpoint by changing the moisture, then the actual value of the compressibility and the difference are measured again in a second stage as a counter-test between the last determined and the target compressibility is used as a correction variable for adjusting a calibration line of the first measuring stage for the first actual value measurement.
- the first measuring stage is at the beginning of the mixing process and the second measuring stage is towards the end of the mixing process.
- the moisture content of the foundry sand that has just been measured and is being treated can be changed.
- the calibration of the known g levels is carried out in the first measuring stage at the start of operation in the first batches.
- a difference that is determined only becomes effective for the next batch because the second measuring stage towards the end of the mixing process is a measure that has proven itself in practice, since the change in the sand composition does not generally occur suddenly, but can be recognized as a tendency in good time.
- the displacement of the calibration line in the first measuring stage is permitted within a predetermined tolerance range.
- the measuring line is understood to mean the approximately linear dependence of the compressibility on the water content of the foundry sand with the respective sand characteristics, preferably sludge content.
- This calibration line can shift depending on the sand characteristics. If this tolerance range is specified, then the difference determined when this tolerance limit is exceeded is used according to the invention to meter individual additional mixture components in front of the mixer differently or to correct their adjusted dosage so that the sand composition or its characteristics in turn leads to the desired setpoint or at least brought back into the tolerance range.
- the tolerance range for the displacement of the calibration line is determined by the sludge content of the sand.
- This is a physically known fact, but in connection with the invention means an evaluation for the corrective measures.
- the sludge content of the sand is a particularly important parameter, and if you can correct it automatically, you have already largely achieved the desired goals.
- the predefined tolerance range for a system in operation is generally set and predefined as an empirical value with a reasonable size, so that in general an over If this range does not occur, in exceptional cases and when the foundry sand is subjected to exceptional loads, a corresponding dosage correction may be necessary, which can be regulated automatically by the measures according to the invention in the manner described above.
- the deformability of the sand is directly related to the bulk density (in kg / l) or the compressibility (in%) and is a very important factor for the foundry specialist.
- Figure 1 the dependence of the compressibility in% on the moisture content in% water is shown as a schematic example.
- a calibration line I for a sludge content of 8%
- a calibration line II for a sludge content of 10%
- a calibration line III for a sludge content of 12%.
- FIG. 2 shows one of the calibration curves in a qualitatively identical diagram to explain the measures according to the invention.
- the point Z shows the desired setpoint on the calibration line, which corresponds to the compressibility C as the setpoint and the moisture content Z 'in% water. If the actual value Y is determined in the first measuring stage I at the start of the measurement on the calibration line, then the actual value A of the compressibility and the actual value Y 'of the moisture content belong to this.
- a measuring signal is now sent from the measuring stage of the compressibility via line 2 to the dosing computer, which contains the required amount of correction water determined in the moisture correction on the basis of the diagram according to FIG. 2 or 3 as a difference between the size Z '- Y'. If this amount of correction water is added, the actual value Z on the calibration line has theoretically been reached as the setpoint.
- the corrective measure according to the invention is illustrated in FIG. 3 using the same schematic diagram.
- the target value Z on the calibration line I is specified. If the actual value Y is measured in the first measuring stage on the calibration line I entered in the computer, this corresponds to a compressibility A and a moisture content Y '.
- the computer assumes the calibration line I as the correct one and determines the amount between the quantities Z 'and Y' as the correction water quantity. After adding this amount of water the mix is processed further, so that the water is finally incorporated into the foundry sand.
- a overall enprobe g is performed in the mixed sand into a second measuring stage.
- the displacement d determined in this way is transmitted via line 1 to the moisture correction and can be used to shift the calibration line in the measuring device which carries out the first measuring stage I in order to shift this amount d.
- the cross-test has produced a value X which does not have the desired and 'desired compressibility C as a setpoint, but instead has the size B.
- the computer at measurement stage I calculated an incorrect amount of correction water and evaluated it incorrectly via line 2 with the moisture correction FK via the metering computer.
- the lower parallel calibration line is with T min and the upper one denoted by T.
- T the tolerance limits for the sludge content of the foundry sand. If one of these limits is exceeded when carrying out the method according to the invention, the calibration straight line is readjusted up to this limit, but at the same time a corresponding measured value is given to the dosing system, for example according to line 1a for the dosing computer for adding filter dust or new sand or via Line 3 for the dosing computer for bentonite and addition of coal dust, possibly based on the measurement of the pressure resistance, as will be explained. There the quantities of new sand, binders or additives can then be automatically increased or reduced accordingly.
- the counter-test described can be carried out particularly advantageously with a measuring device which, in addition to the compressibility, also measures the pressure or shear strength of the sand.
- a measuring device for the compressive strength is indicated schematically above the conveyor 6 in FIG.
- the value obtained in this measurement in the second stage II can be transmitted, for example, via line 3 to the metering system, so that a corresponding correction of bentonite and carbon or additives is carried out.
- dosing computers it is simply possible to automatically correct the addition of bentonite and additives according to the measured strength values of the sand and, moreover, to carry out an additional correction, which is necessary due to the change in the addition of new sand.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Casting Devices For Molds (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3220662 | 1982-06-02 | ||
| DE19823220662 DE3220662A1 (de) | 1982-06-02 | 1982-06-02 | Verfahren zur automatischen regelung von giessereisandaufbereitungsanlagen |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0095657A2 true EP0095657A2 (fr) | 1983-12-07 |
| EP0095657A3 EP0095657A3 (en) | 1985-05-02 |
| EP0095657B1 EP0095657B1 (fr) | 1987-09-30 |
Family
ID=6165045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83104897A Expired EP0095657B1 (fr) | 1982-06-02 | 1983-05-18 | Procédé de régulation automatique des installations de préparation de sable de fonderie |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4569025A (fr) |
| EP (1) | EP0095657B1 (fr) |
| JP (1) | JPS591047A (fr) |
| AU (1) | AU558626B2 (fr) |
| DE (2) | DE3220662A1 (fr) |
| ES (1) | ES8403342A1 (fr) |
| IN (1) | IN158195B (fr) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH662664A5 (de) * | 1983-07-01 | 1987-10-15 | Loepfe Ag Geb | Regelverfahren und regeleinrichtung fuer eine vorrichtung oder vorrichtungsgruppe und vorrichtung mit einer regeleinrichtung. |
| US4780665A (en) * | 1986-09-30 | 1988-10-25 | Deere & Company | Apparatus and method for controlling sand moisture |
| NL8700131A (nl) * | 1987-01-20 | 1988-08-16 | Frederik Christiaan Blees | Werkwijze en inrichting voor het bereiden van betonspecie. |
| US4930354A (en) * | 1989-03-06 | 1990-06-05 | Hartley Controls Corporation | Automatic bond determinator |
| DK245489A (da) * | 1989-05-19 | 1990-11-20 | Dansk Ind Syndikat | Automatisk stoeberianlaeg |
| US5251684A (en) * | 1991-12-06 | 1993-10-12 | Gmd Engineered Systems, Inc. | Method for controlling the oxidation and calcination of waste foundry sands |
| JPH07239322A (ja) * | 1993-04-21 | 1995-09-12 | Mas Fab Gustav Eirich | 型砂の成型特性を確定する方法と装置 |
| CN100534665C (zh) * | 2004-07-07 | 2009-09-02 | 新东工业株式会社 | 测定型砂水分用的电极机构、型砂水分的测定装置、向型砂混砂机内注水的方法以及注水装置 |
| DE102007027298A1 (de) * | 2007-06-11 | 2008-12-18 | Maschinenfabrik Gustav Eirich Gmbh & Co. Kg | Verfahren zur Aufbereitung von Formsand |
| JP6183372B2 (ja) * | 2012-06-13 | 2017-08-23 | 新東工業株式会社 | 鋳物砂の混練調整方法 |
| KR102127707B1 (ko) * | 2013-02-26 | 2020-06-29 | 디팍 초우드하리 | 주물불량감소를 위한 컴퓨터 구현 모래최량화 시스템 및 방법 |
| CN109311080B (zh) * | 2016-05-11 | 2020-06-30 | 新东工业株式会社 | 混炼砂的特性调整系统及特性调整方法 |
| WO2022034560A1 (fr) * | 2020-08-14 | 2022-02-17 | Chowdhary Deepak | Système et procédé d'évaluation de compressibilité du sable |
| CN117460590A (zh) * | 2021-09-28 | 2024-01-26 | 新东工业株式会社 | 活性粘土量估计装置、学习完毕模型生成装置、活性粘土量估计方法以及学习完毕模型生成方法 |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2791120A (en) * | 1952-07-28 | 1957-05-07 | Harry W Dietert Company | Sand controller |
| US3473008A (en) * | 1964-06-12 | 1969-10-14 | Leeds & Northrup Co | System for feed blending control |
| FR1499991A (fr) * | 1966-05-24 | 1967-11-03 | Pedershaab Maskinfabrik As | Dispositifs permettant l'évaluation en unités appropriées des éléments d'un ensemble constitué par leur somme et application notamment à la fabrication du béton |
| US3519252A (en) * | 1966-09-08 | 1970-07-07 | Dietert Co Harry W | Method of and structure for conditioning granular material |
| US3542466A (en) * | 1967-12-21 | 1970-11-24 | Xerox Corp | Development apparatus |
| CH468007A (de) * | 1968-01-05 | 1969-01-31 | Fischer Ag Georg | Verfahren und Vorrichtung zum Prüfen des Befeuchtungsgrades von körnigem Material, wie zum Beispiel Formsand |
| US3751644A (en) * | 1972-02-22 | 1973-08-07 | Sun Oil Co | Automatic blending control system |
| US3959636A (en) * | 1975-03-10 | 1976-05-25 | Mangood Corporation | Batching system |
| DE2855324C2 (de) * | 1978-12-21 | 1986-11-27 | Elba-Werk Maschinen-Gesellschaft Mbh & Co, 7505 Ettlingen | Verfahren zur Regelung der Wasserzugabe bei der Betonzubereitung und Vorrichtung zur Durchführung des Verfahrens |
| US4363742A (en) * | 1980-06-17 | 1982-12-14 | Pettibone Corporation | Method and apparatus for making battery paste |
| JPS57209744A (en) * | 1981-06-19 | 1982-12-23 | Kitagawa Tekkosho:Kk | Adjusting method for compactability of molding sand |
| US4403866A (en) * | 1982-05-07 | 1983-09-13 | E. I. Du Pont De Nemours And Company | Process for making paints |
-
1982
- 1982-06-02 DE DE19823220662 patent/DE3220662A1/de not_active Ceased
-
1983
- 1983-05-13 US US06/494,234 patent/US4569025A/en not_active Expired - Fee Related
- 1983-05-17 AU AU14600/83A patent/AU558626B2/en not_active Ceased
- 1983-05-18 EP EP83104897A patent/EP0095657B1/fr not_active Expired
- 1983-05-18 DE DE8383104897T patent/DE3373877D1/de not_active Expired
- 1983-05-19 IN IN626/CAL/83A patent/IN158195B/en unknown
- 1983-06-01 ES ES522901A patent/ES8403342A1/es not_active Expired
- 1983-06-02 JP JP58098736A patent/JPS591047A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| AU558626B2 (en) | 1987-02-05 |
| EP0095657A3 (en) | 1985-05-02 |
| AU1460083A (en) | 1983-12-08 |
| DE3220662A1 (de) | 1983-12-08 |
| US4569025A (en) | 1986-02-04 |
| JPH0428458B2 (fr) | 1992-05-14 |
| EP0095657B1 (fr) | 1987-09-30 |
| ES522901A0 (es) | 1984-03-16 |
| JPS591047A (ja) | 1984-01-06 |
| DE3373877D1 (en) | 1987-11-05 |
| IN158195B (fr) | 1986-09-27 |
| ES8403342A1 (es) | 1984-03-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0095657B1 (fr) | Procédé de régulation automatique des installations de préparation de sable de fonderie | |
| DE2855324A1 (de) | Verfahren und vorrichtung zur regelung der wasserzugabe bei der betonbereitung | |
| DE2156498C3 (de) | Verfahren zur Herstellung einer unveränderten Mischung einzelner Komponenten mit vorbestimmten Mengenanteilen dieser Komponenten aus mehreren Grundstoffen und Regeleinrichtung zur Durchführung des Verfahrens 4 | |
| DE3102417A1 (de) | "filterband-entwaesserungsvorrichtung" | |
| DE69832765T2 (de) | Mikrowellenkonzentrations-Meßvorrichtung | |
| DE1808998A1 (de) | Verfahren und Vorrichtung zur automatischen Befeuchtung von Mischguetern | |
| EP0291553A1 (fr) | Méthode pour régler une balance de dosage différentielle, en particulier pour matériaux en vrac, et une balance de dosage différentielle pour l'application de la méthode | |
| DE1584308C3 (de) | Verfahren zum chargenweisen Herstellen von Beton und Einrichtung zur Durchführung des Verfahrens | |
| DE2952124A1 (de) | Verfahren zur chargenweisen betonzubereitung | |
| DE2903259A1 (de) | Verfahren zum dosieren von materialien mit wechselnden fliesseigenschaften | |
| DE2432609C3 (de) | Verfahren und Einrichtung zum Zuführen der erforderlichen Zusatzwassermenge bei der Herstellung von Beton | |
| EP0349860A2 (fr) | Procédé de commande de l'addition d'agent de rétention lors de la fabrication du papier | |
| DE1498988A1 (de) | Verfahren und Vorrichtung zum Messen des Feuchtigkeitsgehalts koernigen Materials | |
| DE2145353A1 (de) | Verfahren zur Regelung der Förderung von Schüttgut und Vorrichtung zur Herstellung von gebrannten bzw. gesinterten Erz-Pellets | |
| DD141129A1 (de) | Verfahren und einrichtung zur steuerung des zumessens von mischungsbestandteilen | |
| DE3307977A1 (de) | Verfahren zur herstellung von fliessestrich | |
| EP0017054B1 (fr) | Appareil pour mesurer la résistivité de mélanges de matériaux | |
| DE2145352A1 (de) | Verfahren zur Herstellung von ErzPellets | |
| DE2637433A1 (de) | Verfahren zur steuerung der agglomeration von eisenerzen | |
| EP0226969B1 (fr) | Dispositif pour la fabrication d'un mélange réactif d'au moins deux composants de matériau synthétique | |
| EP3822415A1 (fr) | Structure de mesure pour une suspension de ciment dans le conduit de retour, dispositif de chantier doté d'une structure de mesure ainsi que procédé et utilisation | |
| DE871847C (de) | Verfahren zur Regelung von Zustandsgroessen von Fluessigkeiten, wie beispielsweise Salzgehalt, PH-Wert, Truebung | |
| DE4301113A1 (de) | Verfahren zur Kalibrierung eines Sensors bei der Messung des Feststoffgehaltes von Feststoff-Flüssigkeits-Gemischen und zur Bestimmung von Stoffparametern des genannten Gemisches | |
| DD261203A1 (de) | Verfahren zur kontinuierlichen trocknung von wasserhaltigen schuettguetern | |
| EP0305574A1 (fr) | Procédé et circuit pour contrôler la consistance de béton frais dans un dispositif de mélange de béton stationnaire |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19830609 |
|
| AK | Designated contracting states |
Designated state(s): BE DE FR GB IT |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Designated state(s): BE DE FR GB IT |
|
| 17Q | First examination report despatched |
Effective date: 19860521 |
|
| ITF | It: translation for a ep patent filed | ||
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE FR GB IT |
|
| REF | Corresponds to: |
Ref document number: 3373877 Country of ref document: DE Date of ref document: 19871105 |
|
| ET | Fr: translation filed | ||
| RAP2 | Party data changed (patent owner data changed or rights of a patent transferred) |
Owner name: EIRICH, WALTER Owner name: EIRICH, PAUL Owner name: EIRICH, HUBERT |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) | ||
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| ITTA | It: last paid annual fee | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19970423 Year of fee payment: 15 Ref country code: FR Payment date: 19970423 Year of fee payment: 15 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19970429 Year of fee payment: 15 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19970623 Year of fee payment: 15 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980518 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980531 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980531 |
|
| BERE | Be: lapsed |
Owner name: EIRICH WALTER Effective date: 19980531 Owner name: EIRICH PAUL Effective date: 19980531 Owner name: EIRICH HUBERT Effective date: 19980531 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19980518 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990302 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |