EP0769126B1 - Verstärkte keramische rollen für öfen - Google Patents

Verstärkte keramische rollen für öfen Download PDF

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Publication number
EP0769126B1
EP0769126B1 EP95923366A EP95923366A EP0769126B1 EP 0769126 B1 EP0769126 B1 EP 0769126B1 EP 95923366 A EP95923366 A EP 95923366A EP 95923366 A EP95923366 A EP 95923366A EP 0769126 B1 EP0769126 B1 EP 0769126B1
Authority
EP
European Patent Office
Prior art keywords
roller
reinforcing component
external
mullite
alumina
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 - Lifetime
Application number
EP95923366A
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English (en)
French (fr)
Other versions
EP0769126A1 (de
Inventor
Jacques Paul Raymond Schoennahl
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.)
NUOVA SIRMA Srl
Nuova Sirma SpA
Original Assignee
NUOVA SIRMA Srl
Nuova Sirma SpA
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Publication date
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Publication of EP0769126A1 publication Critical patent/EP0769126A1/de
Application granted granted Critical
Publication of EP0769126B1 publication Critical patent/EP0769126B1/de
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails

Definitions

  • the invention relates to ceramic rollers for ovens roller.
  • a roller oven is a pass-through oven with the bottom is composed of ceramic rollers arranged in parallel to each other and rotated around their axis central by means of a drive system. All rollers rotate in the same direction and substantially at the same speed. This movement causes the load to cook at through the oven.
  • ovens are mainly used for cooking ceramic tiles used for flooring and walls.
  • the cooking tiles are placed directly on the rollers at the entrance of the oven.
  • rollers are also used to bake pieces of complex shape: tableware, sanitary, electronic substrates.
  • the products to be cooked are loaded onto slabs forming supports, these then being placed on the rollers.
  • Current rollers have a length of 1200 to 4000 mm and their outside diameter is between 25 and 55 mm for a wall thickness of 5 to 6 mm.
  • Rollers based on oxide baked at moderate temperature have the disadvantage of only supporting modest loads: thus, the best rolls based on alumina-mullite-cordierite are limited to maximum loads such as the total bending stress (load + self-weight), i.e. less than 50 kg / cm 2 for a maximum working temperature less than or equal to 1250 ° C. This greatly limits their usefulness for certain applications.
  • load + self-weight i.e. less than 50 kg / cm 2 for a maximum working temperature less than or equal to 1250 ° C. This greatly limits their usefulness for certain applications.
  • Rolls based on alumina, alumina-mullite or mullite baked at very high temperature withstand bending stresses of up to 80 kg / cm 2 for maximum working temperatures of 1300-1350 ° C or less, but their cost is much higher than that of rolls baked at low temperature.
  • rollers formed from a material based on at least one silicon compound withstand bending stresses of 200 to 500 kg / cm 2 , for a limit temperature of use which can reach 1600 ° C., but their cost is 7 to 20 times that of the oxide-based rollers.
  • roller composite which has a hollow outer metal cylinder and a ceramic inner core which can be a little more short than the outer cylinder to facilitate coupling with mechanical drive systems.
  • the ceramic inner core is the supporting element and the outer metal cylinder has the function of protecting the core against thermal shock and against contact with products to be cooked. Neither the properties (module in particular), neither the composition of the material constituting the core are indicated.
  • rollers with improved properties compared to rollers based on conventional oxides, while being less expensive than rolls based on alumina, alumina-mullite or very high temperature or base sintered mullite of at least one silicon compound currently marketed.
  • the invention aims to satisfy this need.
  • the invention relates to a roller composite for roller ovens comprising a roller hollow exterior made of a refractory ceramic material based of oxides and a reinforcing element of a material refractory with a modulus of elasticity at 1200 ° C more higher than that of the material of the outer roller, disposed at the inside of the outside roller, the largest dimension of the cross section of the reinforcing element being slightly less than the inside diameter of the roller outside.
  • the modulus of elasticity at 1200 ° C. of the reinforcing element material is at least 2 times that of the outer roller and, preferably, at at minus 3 times.
  • the module of the reinforcing element can be up to 20 times, and even more, than that of material of the external element.
  • the outer roller will usually be made in one inexpensive oxide material suitable for manufacture of oven rolls, for example of a material based on oxides cooked at moderate temperature, such as alumina-mullite cordierite material cited above. Such a material typically has a modulus of elasticity at 1200 ° C from 10 to 25 GPa.
  • the wall thickness of the outer roller is typically of the order of 5-6 mm, without these values having critically important.
  • the interior reinforcing element may have various shapes, for example that of a hollow cylinder or that of a hollow bar with a hexagonal, square section, triangular or an X-shaped profile.
  • a hollow cylindrical reinforcement element i.e. tube-shaped, having a wall thickness on the order of 1.5 to 4 mm.
  • the reinforcing element can be produced, for example example, a material based on oxides cooked at high temperature, such as an alumina, alumina-mullite material or mullite or a material based on at least one composed of silicon such as those mentioned above, between other.
  • Materials based on alumina, alumina-mullite or of mullite cooked at high temperature typically have a modulus of elasticity at 1200 ° C from 50 to 200 GPa, while the materials based on at least one silicon compound have typically a modulus of elasticity at 1200 ° C from 150 to 400 GPa.
  • the inner reinforcing element has advantageously a length less than or equal to 0.9 times that of the outer roller to be reinforced.
  • an element of reinforcement of length substantially less than that of the outer roller for example of a length representing 0.15 to 0.65 times that of the outer roller.
  • the reinforcing element preferably has a length of 0.5 to 2 m approximately.
  • the maximum dimension of the cross section of the reinforcing element should be slightly less than that of the inside diameter of the outside roller for allow the reinforcing element to be put in place and to exert its action as soon as the outer roller bends a little under a load.
  • a clearance of 0.1 to 0.5 mm is usually satisfactory without these values being critics.
  • the reinforcing element will advantageously be centered relative to the roller bearings on the bearings of the oven supporting the roller, or in relation to the loads supported by the roller in service, so that the exterior oxide roller is reinforced mechanically in the area where, in service, the maximum bending stress.
  • the single figure is a sectional view longitudinal, of a composite roller conforming to the invention.
  • the reference 1 designates the roller exterior based on oxides
  • reference 2 an element of tube-shaped reinforcement less than that of the outer roller
  • reference 3 designates the zones where the roller will be, in service, supported on bearings
  • the reference 4 designates the part of the roller which will project from the oven and will receive means for driving the roller, by example a toothed wheel (not shown).
  • the rolls thus produced were mounted in an oven roller for firing ceramic tiles at one temperature of the order of 1200 ° C.
  • the distance between the supports of each roller on the oven bearings was 2.91 m and the loaded length was of 1.83 m.
  • the weight of the reinforcing elements in Advancer leads to an increase in the deflection composite rolls of about 1 mm, compared to that Unreinforced Siroll LP rollers.
  • the composite rollers of the invention have an arrow about 3 times lower than that of non-rollers reinforced: 3.4 mm instead of 11.1 mm, while the boom rolls in Advancer is 2 mm.
  • the deflection measured is 6.0 mm for composite rollers of the invention supporting the same charge.
  • the present invention therefore makes it possible to obtain service performance far superior to that of rollers based on standard oxides for a cost less than that of rolls made of material baked at high temperature and much lower than that of rollers based on at least one composed of silicon.
  • the reinforcing element used in the invention has a much lower volume to that of a roller made entirely of high-density material performance, because its diameter, thickness wall and its length can be much less.
  • the invention also makes it possible to exploit the good hot stiffness of alumina, alumina-mullite materials or mullite cooked at high temperature (overcooked), without risking rupture by thermal shock, during their introduction into a working oven.
  • the roller exterior, very resistant to thermal shock constitutes a protective cover for the reinforcing element interior, sensitive to thermal shock.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Claims (10)

  1. Zusammengesetzte Rolle für Rollenherdöfen mit einer hohlen äußeren Rolle (1) aus feuerfestem Material und einem Verstärkungselement (2) aus einem feuerfesten Material, das im Inneren der äußeren Rolle angeordnet ist, wobei die größte Abmessung des Querschnitts des Verstärkungselements geringfügig kleiner als der Innendurchmesser der äußeren Rolle ist, dadurch gekennzeichnet, daß die äußere Rolle (1) aus einem keramischen Material auf Oxidbasis besteht und das Verstärkungselement (2) bei 1200°C einen Elastizitätsmodul aufweist, der höher als derjenige des Materials der äußeren Rolle ist.
  2. Rolle nach Anspruch 1, dadurch gekennzeichnet, daß das Verstärkungselement (2) die Form eines Rohres hat.
  3. Rolle nach Anspruch 2, dadurch gekennzeichnet, daß das Verstärkungselement (2) eine Wandstärke von 1,5 bis 4 mm aufweist.
  4. Rolle nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Verstärkungselement (2) kürzer als die äußere Rolle ist.
  5. Rolle nach Anspruch 4, dadurch gekennzeichnet, daß die Länge des Verstärkungselements (2) das 0,15- bis 0,65-fache der Länge der äußeren Rolle beträgt.
  6. Rolle nach Anspruch 1, 4 oder 5, dadurch gekennzeichnet, daß das Verstärkungselement (2) in bezug auf die Auflagestellen (3) der Rolle auf den die Rolle stützenden Lagern des Ofens zentriert ist.
  7. Rolle nach Anspruch 1, 4 oder 5, dadurch gekennzeichnet, daß das Verstärkungselement (2) in bezug auf die von der Rolle im Betrieb gestützten Chargen zentriert ist.
  8. Rolle nach den Ansprüchen 2 bis 7, dadurch gekennzeichnet, daß der Elastizitätsmodul des Materials des Verstärkungselements (2) bei 1200°C wenigstens 2 mal so groß ist wie derjenige der äußeren Rolle.
  9. Rolle nach den Ansprüchen 2 bis 7, dadurch gekennzeichnet, daß der Elastizitätsmodul des Materials des Verstärkungselements (2) bei 1200°C wenigstens 3 mal so groß ist wie derjenige der äußeren Rolle (1).
  10. Rolle nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die äußere Rolle (1) aus Aluminiumdioxid-Mullit-Cordierit besteht und das Verstärkungselement (2) aus einem Material besteht, das aus der Gruppe ausgewählt ist, die durch Materialien auf der Basis von Aluminiumdioxid, Aluminiumdioxid-Mullit oder Mullit, und durch Materialien auf der Basis wenigstens einer Siliziumkomponente gebildet ist, die aus der Gruppe ausgewählt sind, die aus Siliziumkarbid, Siliziumnitrid, Silizium-Oxynitrid und Sialonen besteht.
EP95923366A 1994-06-08 1995-06-07 Verstärkte keramische rollen für öfen Expired - Lifetime EP0769126B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9407013 1994-06-08
FR9407013A FR2721098B1 (fr) 1994-06-08 1994-06-08 Rouleaux céramiques pour fours à base d'oxydes renforcés par un élément de renforcement à haut module d'élasticité à chaud.
PCT/FR1995/000733 WO1995033965A1 (fr) 1994-06-08 1995-06-07 Rouleaux ceramiques renforces pour fours

Publications (2)

Publication Number Publication Date
EP0769126A1 EP0769126A1 (de) 1997-04-23
EP0769126B1 true EP0769126B1 (de) 1998-08-12

Family

ID=9464000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95923366A Expired - Lifetime EP0769126B1 (de) 1994-06-08 1995-06-07 Verstärkte keramische rollen für öfen

Country Status (6)

Country Link
EP (1) EP0769126B1 (de)
CN (1) CN1150474A (de)
DE (1) DE69504080D1 (de)
FR (1) FR2721098B1 (de)
TW (1) TW296424B (de)
WO (1) WO1995033965A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1296514B1 (it) * 1997-11-26 1999-06-25 Icra S P A Utilizzo di materiali ceramici contenenti componenti come cordierite e/o mullite e come carburi e/o nitruri per la fabbricazione di

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1381241A (fr) * 1963-03-05 1964-12-14 Saint Gobain Rouleaux indéformables à haute température et leur application
AT268969B (de) * 1966-06-22 1969-02-25 Siemens Gmbh Förderrolle für Rollenherdöfen
DE2713741A1 (de) * 1977-03-29 1978-10-05 Thyssen Edelstahlwerke Ag Fuehrungsrolle mit waermestrahlungsschutz
IT7928946V0 (it) * 1979-04-13 1979-04-13 U Mori E C S P A Ing Rullo per il convogliamento di prodotti nei forni particolarmente nella ceramica

Also Published As

Publication number Publication date
FR2721098A1 (fr) 1995-12-15
FR2721098B1 (fr) 1996-08-23
WO1995033965A1 (fr) 1995-12-14
DE69504080D1 (de) 1998-09-17
EP0769126A1 (de) 1997-04-23
TW296424B (de) 1997-01-21
CN1150474A (zh) 1997-05-21

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