EP0015530B1 - Procédé et dispositif pour le dosage automatique de l'eau pour l'actionnement d'un tambour refroidisseur de fonderie permettant le refroidissement simultané du sable de moulage, du sable à noyaux et de la fonte - Google Patents

Procédé et dispositif pour le dosage automatique de l'eau pour l'actionnement d'un tambour refroidisseur de fonderie permettant le refroidissement simultané du sable de moulage, du sable à noyaux et de la fonte Download PDF

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Publication number
EP0015530B1
EP0015530B1 EP80101056A EP80101056A EP0015530B1 EP 0015530 B1 EP0015530 B1 EP 0015530B1 EP 80101056 A EP80101056 A EP 80101056A EP 80101056 A EP80101056 A EP 80101056A EP 0015530 B1 EP0015530 B1 EP 0015530B1
Authority
EP
European Patent Office
Prior art keywords
water
cooling drum
sand
cooling
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.)
Expired
Application number
EP80101056A
Other languages
German (de)
English (en)
Other versions
EP0015530A1 (fr
Inventor
Hans Schetter
Rudi Münkel
Günter Hertlein
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.)
Carl Schenck AG
Original Assignee
Dossmann Eisengiesserei und Maschinenfabrik GmbH
Dossmann Eisengiesserei und Maschinenfabrik GmbH
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 Dossmann Eisengiesserei und Maschinenfabrik GmbH, Dossmann Eisengiesserei und Maschinenfabrik GmbH filed Critical Dossmann Eisengiesserei und Maschinenfabrik GmbH
Priority to AT80101056T priority Critical patent/ATE1570T1/de
Publication of EP0015530A1 publication Critical patent/EP0015530A1/fr
Application granted granted Critical
Publication of EP0015530B1 publication Critical patent/EP0015530B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
    • B22C5/085—Cooling or drying the sand together with the castings

Definitions

  • the invention relates to the fully automatic operation of a foundry cooling drum for the simultaneous cooling of mold and core sand and casting emptied from the mold, and to the automatic metering of the amount of water required for optimal cooling conditions.
  • Such cooling drums are e.g. known from DE-A-2431 509 and DE-A-2822333.
  • the cooling drums are important facilities. On the one hand, they allow a faster and automated operating process. On the other hand, a more uniform and stress-avoiding cooling is achieved in the demolded casting that is circulated together with the sand, and the molding sand is available for reuse more quickly. In addition to these production advantages, these cooling drums are becoming increasingly important because less noise, less heat radiation and less dust are produced compared to previous working methods, and more environmentally friendly and humane conditions are created at the workplace.
  • These cooling drums are rotated around the horizontal or slightly inclined drum axis, whereby the material to be cooled moves from the inlet to the outlet.
  • the cooling takes place by means of water evaporation and there is the problem at all times of supplying the amount of water with which the given conditions, which are subject to constant changes both at the inlet and during the passage, are currently taken into account: these conditions, especially the introduced one Amount of heat change, for example in that different casting temperatures are used, in that the time intervals between casting and entry into the cooling drum and thus in the inlet temperatures change, or in that there is a changing volume ratio of casting to sand.
  • the passage of the casting through the cooling drum over time can also be subject to changes depending on the weight and shape of the casting.
  • the amount of water should be measured so that the sand does not clump and remains free-flowing at every point of the drum, on the one hand so that it causes good water evaporation due to the large surface area, and on the other hand due to good and versatile contact with the metal surfaces .
  • the sand must not become too dry either, since otherwise the heat dissipation will decrease, losses of bentonite and coal dust, which are not negligible due to the development of dust, and the exhaust air cleaning system will be heavily polluted.
  • the sand should also be conditioned to a certain extent for reuse. For a good operation, it was found that the sand at the outlet of the drum should have a temperature below 50 ° C and a water content of 1 to 2% and the casting should have a temperature of 60 to 100 ° C.
  • None of the known methods permits a metering of the water addition which responds directly to the current temperature, and much less a correction of the water addition in accordance with the temperature change over the course of the passage of the material to be cooled in the drum.
  • the invention relates to a method and an apparatus for solving this problem.
  • the method for automatic water metering for operating a foundry cooling drum for the simultaneous cooling of molding sand and core sand and cast iron is characterized in that in the interior of the cooling drum, the temperature emanating from the material to be cooled, which is to be cooled, is contactless and continuously at short intervals by means of at least one infrared camera it is measured that electrical signals corresponding to the measured temperatures are formed in a transmitter, that a control signal is formed from each of these signals or from the mean of several signals in a control device, which then controls the positioner of a motorized, pneumatic or hydraulic valve for the Water supply controls.
  • the time intervals between two measurements can be approximately 0.1 to 10 seconds.
  • Usable mean values are already obtained from two measurements. For the calculation of mean values, successive measured values of an infrared camera or the measured values of several infrared cameras can be used.
  • each measuring range serves a complete and independently working dosing system.
  • the cooling drum 1 has an inlet 2 for the goods to be cooled and an outlet 3 where the cooled castings are removed.
  • the cooled sand trickles through perforations at the outlet end of the cooling drum 1 on a conveyor belt.
  • the infrared camera 4a is installed for the first measuring range, seen from the inlet.
  • the optics of this infrared camera 4a (as well as any other infrared camera 4), as can be seen in FIG. 2, is preferably directed to a central location or a location of approximately the greatest thickness of the refrigerated goods 11, as is the result of the , the rotation of the cooling drum indicated by the arrow (see FIG. 2).
  • the measuring object distance depends on the optics used.
  • the first measuring and water metering area should be where the water brought along by the sand has largely evaporated and the lumps of sand coming out of the mold have disintegrated.
  • the electrical line 15a leads from the infrared camera 4a or its built-in transmitter to the control device 5a.
  • a control signal is formed and given to the positioner 6a of the motorized, hydraulically or pneumatically operated metering valve 7a in the water supply line 8a. Pneumatic positioners are preferably used.
  • the individual measured value signals or an average of several successive measured value signals can be used to form the control signal.
  • a plurality of infrared cameras can be used for each measuring and metering area, from whose measured value signals an average is formed.
  • the water supply line 8a is led into the interior of the cooling drum 1, where it is opti through one or more outlet pipes, spray or spray nozzles 9a for the desired cooling and cohesion effect delivers the amount of water.
  • the outlet pipes, spray or spray nozzles 9 are directed upward so that their mouths are above the water supply line 8a.
  • shut-off valve 10a In the direction of flow before the metering valve 7a there is the shut-off valve 10a, with which the water supply is interrupted immediately when the cooling drum is at a standstill. It is advantageous to use an electromagnetically operated shut-off valve which is controlled by the control current of the cooling drum drive.
  • the zero position of the metering valve 7a can be regulated.
  • the device works fully automatically in such a way that the current temperature acts immediately and therefore very quickly and reliably on the water supply or its metering, and that only so much water is added per measuring and metering area that the sand remains capable of traveling, but not too dry becomes.
  • a second measuring range with an independently operating metering system is also provided.
  • This is constructed in the same way as the system described above and includes the infrared camera 4b, the electrical line 15b, the control device 5b, the positioner 6b, the metering valve 7b, the water supply line 8b, the outlet pipes, spray or spray nozzles 9b and that Shut-off valve 10b.
  • the distance between the two measuring and dosing areas is dimensioned such that after the water added in the first area has largely evaporated, further water is added in the second area depending on the temperature measured there.
  • the drum length and diameter as well as the speed of rotation also play a role.
  • the arrangement of two and possibly even more ranges means that the temperature conditions in the interior of the cooling drum, or the ones introduced, are constantly and often irregularly changing both at the entrance and during the passage Amount of heat better recorded, so that the amount of water required just there is supplied to the cooling drum at every point and optimum cooling is achieved.
  • multiple equipment e.g. Length, diameter, operating speed and other design and operating features of the cooling drum as well as the type of casting program are decisive.
  • infrared cameras which in addition to the normal cooling jacket are provided with a further jacket through which compressed air is passed so that it exits around the camera lens and has a flow direction such that dust, vapors and gases are not used Lens can reach.
  • 3 shows the diagram of such a camera.
  • the infrared camera 4 is surrounded by a protective housing 12 so that a space is formed around the outer walls of the camera. Compressed air is introduced through the inlet connection 13 and flows around the camera, as indicated by the arrows, and flows out around the optics and then flows out through the protective tube 16 extending beyond the optics. 14 with the connecting cable and 17 with the pipeline for the flow medium of the normal cooling system.
  • the protective housing 12 is also used for thermal insulation and protection against mechanical damage.
  • the invention offers the advantage that for every casting program, every ratio of sand to metal and every casting size, the optimal amount of water is supplied fully automatically, this automatic also being fully effective in all irregularities that are unavoidable in the foundry operation and when the casting program is changed and the water supply is achieved in a matter of seconds adapts to the current situation.
  • the device is structurally simple and adaptable, on the one hand to all cooling drum constructions, on the other hand to all operating characteristics.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Sampling And Sample Adjustment (AREA)

Claims (12)

1. Procédé pour le dosage automatique de l'eau pour le fonctionnement d'un tambour refroidisseur (1) utilisé en fonderie pour le refroidissement simultané du sable de moule et de noyaux et de la pièce moulée (11), caractérisé en ce que, dans le volume intérieur du tambour refroidisseur(1), la température de rayonnement de la matière (11) en cours de refroidissement, est mesurée sans contact, à l'aide d'au moins une caméra à infrarouges (4, 4a, 4b) de façon consécutive à de courts intervalles de temps, en ce que les températures mesurées sont transformées dans un convertisseur de mesure en signaux électriques correspondants, en ce que, à partir de chacun desdits signaux ou bien de la valeur moyenne de plusieurs signaux, un signal de commande est produit dans un dispositif de commande (5a, 5b), ledit signal commandant alors le régulateur de position (6a, 6b) d'une vanne de dosage, actionnée par moteur, pneumatiquement ou hydrauliquement, pour l'alimentation en eau.
2. Procédé selon la revendication 1, caractérisé en ce que les mesures consécutives de température, et par conséquent les réglages du dosage d'eau, sont effectués à intervalles de temps de 0,1 à 10 secondes.
3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce qu'on mesure la température sur le trajet de passage de la matière à refroidir (11) dans plusieurs zones placées à intervalles, en ce que, dans les zones correspondantes, on dose l'alimentation en eau, en ce que la mesure et le dosage réalisés en premier sont effectués dans la zone où l'eau entraînée par le sable s'est évaporée en majeure partie et les grumeaux de sable provenant du moule se sont désagrégés et en ce que la mesure et le dosage réalisés en second, et le cas échéant d'autres mesures et dosages, sont effectués où l'eau introduite dans la première zzone, ou la zone précédente, s'est évaporée en majeure partie.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que, pour l'étalonnage de l'installation, on règle la position de zéro de la vanne de dosage d'eau (7a, 7b).
5. Dispositif pour la mise en oeuvre du procédé selon l'une des revendications 1 à 4, caractérisé en ce qu'il est prévu une ou plusieurs zones de mesure de température et de dosage d'eau présentant les caractéristiques suivantes :
a) dans le volume intérieur du tambour- refroidisseur (1) est installée une caméra à infra- rouges (4) ou plusieurs caméras (4a, 4b) à infra- rouges disposées l'une derrière l'autre, l'une à côté de l'autre ou avec décalage,
b) à l'extérieur du tambour refroidisseur (1), se trouve un dispositif de commande (5) qui reçoit les signaux de mesure de températures de la caméra à infra-rouges et qui produit en correspondance un signal de commande d'alimentation en eau,
c) un tuyau d'alimentation en eau (8) passe dans le volume intérieur du tambour refroidisseur et débouche dans des tubes de décharge, des buses de pulvérisation ou de projection (9) qui sont placés dans la zone de mesure de température;
d) dans le tuyau d'alimentation en eau (8), se trouve une vanne de dosage (7) qui est actionnée par moteur, pneumatiquement ou hydrauliquement, un régulateur de position (6), commandé par le dispositif de commande (5) étant prévu pour cet actionnement ;
e) en amont de la vanne dosage (7) en considérant le sens de passage, il y a une vanne d'arrêt (10) qui interrompt l'alimentation en eau par couplage avec l'entraînement du tambour lors de l'immobilisation de ce dernier.
6. Dispositif selon la revendication 5, caractérisé en ce que la partie optique de la caméra infra- rouges (4, figure 2) est dirigée vers une zone médiane, ou une zone d'épaisseur un peu supérieure de la matière à refroidir (11), en correspondance au positionnement de la matière à refroidir (11) par suite de la rotation du tambour a refroidisseur (figure 2).
7. Dispositif selon l'une des revendications 5 ou 6, caractérisé en ce que la première zone de mesure de température et de dosage d'eau est placée à l'endroit du tambour refroidisseur, où l'eau entraînée par le sable est vaporisée en majeure et où les grumeaux de sable provenant du moule sont désagrégés.
8. Dispositif selon l'une des revendications 5 à 7, caractérisé en ce qu'il est prévu une seconde ou d'autres zones de mesure de température et de dosage d'eau à l'endroit du tambour refroidisseur, où l'eau introduite dans la zone précédente s'est en majeure partie évaporée.
9. Dispositif selon l'une des revendications 5 à 8, caractérisé en ce que les tubes de décharge, les buses de pulvérisation ou de projection (9, figure 2) sont orientés vers le haut de telle sorte que leurs embouchures soient situées au-dessus du tuyau d'alimentation en eau (8).
10. Dispositif selon l'une des revendications 5 à 9, caractérisé en ce que la vanne d'arrêt (10) est une vanne électromagnétique commandée par l'intermédiaire du courant de commande de l'entraînement du tambour de refroidissement.
11. Dispositif selon l'une des revendications 5 à 10, caractérisé en ce que la position de zéro de la vanne de dosage (7) est réglable.
12. Dispositif selon l'une des revendications 5 à 11, caractérisé en ce qu'il est prévu une caméra à infra-rouges (4, figure 3) pourvue d'un carter extérieur de protection (12) qui constitue un volume intermédiaire autour des parois extérieures de la caméra à infra-rouges, une tubulure d'injection (13) d'air comprimé placée sur le côté arrière de la caméra, une fente annulaire entourant la partie optique de la caméra et un tube protecteur (16) dépassant de la partie optique.
EP80101056A 1979-03-07 1980-03-03 Procédé et dispositif pour le dosage automatique de l'eau pour l'actionnement d'un tambour refroidisseur de fonderie permettant le refroidissement simultané du sable de moulage, du sable à noyaux et de la fonte Expired EP0015530B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80101056T ATE1570T1 (de) 1979-03-07 1980-03-03 Verfahren und vorrichtung zur automatischen wasserdosierung zum betreiben einer giessereikuehltrommel fuer das gleichzeitige kuehlen von form- und kernsand und guss.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2908861 1979-03-07
DE2908861A DE2908861C3 (de) 1979-03-07 1979-03-07 Verfahren und Vorrichtung zur automatischen Wasserdosierung beim Betreiben einer Gießereikühltrommel für das gleichzeitige Kühlen von Form- und Kernsand und Guß

Publications (2)

Publication Number Publication Date
EP0015530A1 EP0015530A1 (fr) 1980-09-17
EP0015530B1 true EP0015530B1 (fr) 1982-09-22

Family

ID=6064696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101056A Expired EP0015530B1 (fr) 1979-03-07 1980-03-03 Procédé et dispositif pour le dosage automatique de l'eau pour l'actionnement d'un tambour refroidisseur de fonderie permettant le refroidissement simultané du sable de moulage, du sable à noyaux et de la fonte

Country Status (4)

Country Link
EP (1) EP0015530B1 (fr)
AT (1) ATE1570T1 (fr)
DE (1) DE2908861C3 (fr)
DK (1) DK160679C (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06126383A (ja) * 1992-10-23 1994-05-10 Sintokogio Ltd 金型鋳造設備における金型温度の制御方法およびその装置
US5505247A (en) * 1993-05-21 1996-04-09 General Kinematics Corporation Casting process and system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT227978B (de) * 1957-07-11 1963-06-25 Dietert Co Harry W Einrichtung zum Regulieren des Feuchtigkeitsgehaltes von körnigem Schüttgut
DE1808998C3 (de) * 1968-11-15 1972-01-20 Kurt Ahrenberg Verfahren und Vorrichtung zur automatischen Befeuchtung von Mischguetern
US3599649A (en) * 1969-04-10 1971-08-17 Nat Eng Co Apparatus for cooling granular material
NL7309900A (nl) * 1973-07-16 1975-01-20 Expert Nv Koelerdroger van gietstukken en vormzand.
DE2607265C3 (de) * 1976-02-23 1979-04-19 Mec-Fond S.P.A., S. Prospero, Modena (Italien) Vorrichtung zum Kühlen von Gußteilen und Formsand
DE2651154B1 (de) * 1976-11-09 1977-12-29 Fischer Ag Georg Einrichtung zur temperaturkompensation bei der regelung der formbarkeit von koernigem material
DE2702301A1 (de) * 1977-01-21 1978-07-27 Polysius Ag Verfahren und einrichtung zur bestimmung der temperaturverhaeltnisse bei einem drehrohrofen
GB1603082A (en) * 1977-05-27 1981-11-18 Wallwork & Co Ltd Henry Casting installations

Also Published As

Publication number Publication date
DE2908861A1 (de) 1980-09-18
DE2908861C3 (de) 1981-12-17
EP0015530A1 (fr) 1980-09-17
DE2908861B2 (de) 1981-04-16
DK97480A (da) 1980-09-08
DK160679B (da) 1991-04-08
ATE1570T1 (de) 1982-10-15
DK160679C (da) 1991-09-23

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