EP0095657B1 - Verfahren zur automatischen Regelung von Giessereisandaufbereitungsanlagen - Google Patents

Verfahren zur automatischen Regelung von Giessereisandaufbereitungsanlagen Download PDF

Info

Publication number
EP0095657B1
EP0095657B1 EP83104897A EP83104897A EP0095657B1 EP 0095657 B1 EP0095657 B1 EP 0095657B1 EP 83104897 A EP83104897 A EP 83104897A EP 83104897 A EP83104897 A EP 83104897A EP 0095657 B1 EP0095657 B1 EP 0095657B1
Authority
EP
European Patent Office
Prior art keywords
sand
compactability
stage
measurement
respect
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83104897A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0095657A3 (en
EP0095657A2 (de
Inventor
Hubert Eirich
Paul Eirich
Walter Eirich
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.)
EIRICH, HUBERT
EIRICH, PAUL
EIRICH, WALTER
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0095657A2 publication Critical patent/EP0095657A2/de
Publication of EP0095657A3 publication Critical patent/EP0095657A3/de
Application granted granted Critical
Publication of EP0095657B1 publication Critical patent/EP0095657B1/de
Expired legal-status Critical Current

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 sand processing 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 also takes into account its compressibility or deformability, which in turn is 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. solved by specifying a setpoint for given sand characteristics, both for the compressibility (C) and for the moisture (Z ') according to a first calibration line (I), the actual value (Y) of the compressibility (A) in one measured in the first stage and by changing the moisture (from Y 'to Z') to the moisture setpoint (Z '), then the cross-sample is again measured in a second stage, the actual value (X) of the compressibility (B) and the difference ( BC) between the last determined (B) and the target compressibility (C) is used as a correction variable (d) for adjusting the calibration line (I) to a second calibration line (11), which is then used in the first measuring stage as a new calibration line for the Actual value measurement is used.
  • 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 lines known per se are adjusted in the first measuring stage at the start of operation in the first batches.
  • any difference that is determined will actually only become effective for the next batch, because the second measuring stage is towards the end of the mixing process; a measure that has proven itself in practice, since the change in sand composition does not usually 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 dead zone.
  • 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 tolerance range is usually set and specified as a empirical value with a reasonable size in a system in operation, so that this range is generally not exceeded, in exceptional cases and when the foundry sand is subjected to exceptional loads, a corresponding dosage correction may be necessary. which is automatically controllable 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 11 for a sludge content of 10%
  • a calibration line 111 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 measurement signal is now sent from the measuring level 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 this amount of water has been added, the mixed material is processed further, so that the water is finally incorporated into the foundry sand. At the end of the mixing process or after leaving the mixing device, a cross-test is carried out in the mixed sand in 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, that is to say the 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 designated T min and the upper one T max .
  • T min and T max are the specified 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 1 for the dosing computer for adding filter dust or new sand or via Line 3 for the metering computer for bentonite and addition of coal dust, possibly based on the measurement of the compressive strength, 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 11 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)
EP83104897A 1982-06-02 1983-05-18 Verfahren zur automatischen Regelung von Giessereisandaufbereitungsanlagen Expired EP0095657B1 (de)

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 EP0095657A2 (de) 1983-12-07
EP0095657A3 EP0095657A3 (en) 1985-05-02
EP0095657B1 true EP0095657B1 (de) 1987-09-30

Family

ID=6165045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83104897A Expired EP0095657B1 (de) 1982-06-02 1983-05-18 Verfahren zur automatischen Regelung von Giessereisandaufbereitungsanlagen

Country Status (7)

Country Link
US (1) US4569025A (enrdf_load_stackoverflow)
EP (1) EP0095657B1 (enrdf_load_stackoverflow)
JP (1) JPS591047A (enrdf_load_stackoverflow)
AU (1) AU558626B2 (enrdf_load_stackoverflow)
DE (2) DE3220662A1 (enrdf_load_stackoverflow)
ES (1) ES522901A0 (enrdf_load_stackoverflow)
IN (1) IN158195B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4016110A1 (de) * 1989-05-19 1990-12-06 Dansk Ind Syndikat Automatisierte giessereianlage

Families Citing this family (11)

* Cited by examiner, † Cited by third party
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
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
BRPI0513160A (pt) * 2004-07-07 2008-04-29 Sintokogio Ltd dispositivo de elétrodos para medir o teor de água na areia de fundição, aparelho para medir o teor de água na areia de fundição e um método e aparelho para fornecimento de água a um misturador de areia
DE102007027298A1 (de) * 2007-06-11 2008-12-18 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Verfahren zur Aufbereitung von Formsand
WO2013187341A1 (en) * 2012-06-13 2013-12-19 Sintokogio, Ltd. Mixing and adjusting method for foundry sand
CN104968452B (zh) * 2013-02-26 2018-08-07 迪帕克·乔杜里 砂优化以减少铸造废品的计算机实施系统和方法
BR112018072269A2 (pt) * 2016-05-11 2019-02-12 Sintokogio, Ltd. sistema de ajuste de propriedades e método de ajuste de propriedades para areia amassada

Family Cites Families (12)

* Cited by examiner, † Cited by third party
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

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Beschreibung eines "Water Dosing Instrument 78", d. K. Trischberger vom 21.2.1978 *
Prospekt d. Fa. Eirich Nr. GI 910 7000 vom Februar 1979 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4016110A1 (de) * 1989-05-19 1990-12-06 Dansk Ind Syndikat Automatisierte giessereianlage

Also Published As

Publication number Publication date
DE3220662A1 (de) 1983-12-08
AU1460083A (en) 1983-12-08
US4569025A (en) 1986-02-04
JPS591047A (ja) 1984-01-06
EP0095657A3 (en) 1985-05-02
JPH0428458B2 (enrdf_load_stackoverflow) 1992-05-14
DE3373877D1 (en) 1987-11-05
AU558626B2 (en) 1987-02-05
ES8403342A1 (es) 1984-03-16
IN158195B (enrdf_load_stackoverflow) 1986-09-27
EP0095657A2 (de) 1983-12-07
ES522901A0 (es) 1984-03-16

Similar Documents

Publication Publication Date Title
EP0095657B1 (de) Verfahren zur automatischen Regelung von Giessereisandaufbereitungsanlagen
DE8528992U1 (de) Durchlaufwaage zum Erfassen des Durchsatzes von in einer Getreidemühle verarbeiteten schüttbaren Nahrungsmitteln
DE112013002952B4 (de) Misch- und Einstellverfahren für Formsand
DE2156498B2 (de) Verfahren zur herstellung einer mischung mit vorbestimmter mengenzusammensetzung einzelner komponenten aus mehreren ausgangsstoffen und regeleinrichtung zur durchfuehrung des verfahrens
EP0140213A1 (de) Verfahren und Vorrichtung zur Erfassung des Durchsatzes eines Schüttgutstromes
EP0291553B1 (de) Verfahren zur Regelung einer Differential-Dosierwaage, insbesondere für Schüttgüter, und Differential-Dosierwaage zur Durchführung des Verfahrens
DE1808998A1 (de) Verfahren und Vorrichtung zur automatischen Befeuchtung von Mischguetern
DE3102417A1 (de) "filterband-entwaesserungsvorrichtung"
DE2729355A1 (de) Verfahren sowie ueberwachungs- und regelvorrichtung zur herstellung einer mischung
DE1584308C3 (de) Verfahren zum chargenweisen Herstellen von Beton und Einrichtung zur Durchführung des Verfahrens
DE2432609C3 (de) Verfahren und Einrichtung zum Zuführen der erforderlichen Zusatzwassermenge bei der Herstellung von Beton
EP0210294B1 (de) Verfahren und Vorrichtung zur Herstellung von Suspensionen mit konstanten Merkmalen aus Grundstoffen mit veränderlichen Eigenschaften
EP0349860A2 (de) Verfahren zur Steuerung der Retentionsmittelzugabe bei der Papierherstellung
DE1498988A1 (de) Verfahren und Vorrichtung zum Messen des Feuchtigkeitsgehalts koernigen Materials
DE2741510A1 (de) Verfahren und regelanordnung zur durchsatzregelung einer sichterumlaufmahlanlage
DD141129A1 (de) Verfahren und einrichtung zur steuerung des zumessens von mischungsbestandteilen
DE3304193C2 (enrdf_load_stackoverflow)
EP0226969B1 (de) Vorrichtung zum Herstellen eines Reaktionsgemisches aus mindestens zwei Kunststoffkomponenten
DE2417012A1 (de) Verfahren und vorrichtung zur herstellung einer betonmischung gebildet von zementzuschlagstoffen, wasser und zusatzmitteln
DE2637433A1 (de) Verfahren zur steuerung der agglomeration von eisenerzen
DE2145352A1 (de) Verfahren zur Herstellung von ErzPellets
DE4301113A1 (de) Verfahren zur Kalibrierung eines Sensors bei der Messung des Feststoffgehaltes von Feststoff-Flüssigkeits-Gemischen und zur Bestimmung von Stoffparametern des genannten Gemisches
EP0017054A2 (de) Vorrichtung zum Messen des spezifischen elektrischen Widerstandes in Mischgütern
DD261203A1 (de) Verfahren zur kontinuierlichen trocknung von wasserhaltigen schuettguetern
DE3402939C2 (enrdf_load_stackoverflow)

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