EP0769126A1 - Rouleaux ceramiques renforces pour fours - Google Patents
Rouleaux ceramiques renforces pour foursInfo
- Publication number
- EP0769126A1 EP0769126A1 EP95923366A EP95923366A EP0769126A1 EP 0769126 A1 EP0769126 A1 EP 0769126A1 EP 95923366 A EP95923366 A EP 95923366A EP 95923366 A EP95923366 A EP 95923366A EP 0769126 A1 EP0769126 A1 EP 0769126A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- reinforcing element
- mullite
- alumina
- roller according
- 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
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 roller ovens.
- a roller oven is a passage oven whose bottom is made up of ceramic rollers arranged parallel to each other and rotated around their central axis by means of a drive system. All the rollers rotate in the same direction and at substantially the same speed. This movement causes the load to be cooked through the oven.
- These ovens are mainly used for firing ceramic tiles used for coating floors and walls. The cooking tiles are placed directly on the rollers at the entrance to the oven.
- roller ovens are also used to cook complex shaped items: tableware, sanitary fittings, electronics substrates. In this case, 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 formed of refractory materials based on oxides baked at moderate temperature ( ⁇ 1500 ° C), such as alumina-mullite-cordierite materials (such as the Siroll LP material sold by the company Nuova Sirma, Italy); - rolls based on alumina, alumina-mullite or mullite baked at very high temperature (> 1500 ° C);
- materials based on at least one silicon compound such as materials formed from Sic grains bound by a silicon nitride binder (such as the Advancer material sold by the company Norton), recrystallized silicon carbide (such as the Norton Crystar product), or materials based of silicon carbide impregnated with silicon.
- 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.
- Rolls based on alumina, alumina-mullite or mullite baked at very high temperatures withstand bending stresses of up to 80 kg / cm 2 for maximum working temperatures less than or equal to 1300-1350 ° C, but their cost is much higher than that of rolls baked at low temperature.
- the 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.
- rollers having improved properties compared to rollers based on conventional oxides, while being less expensive than rollers based on alumina, alumina-mullite or mullite.
- the invention aims to satisfy this need. More specifically, the invention relates to a composite roller for roller ovens comprising a hollow outer roller made of a refractory ceramic material based on oxides and a reinforcing element made of a refractory material having a higher modulus of elasticity at 1200 ° C. than that of the material of the outer roller, arranged inside the outer roller, the largest dimension of the cross section of the reinforcing element being slightly less than the inner diameter of the outer roller.
- the modulus of elasticity at 1200 ° C. of the material of the reinforcing element is equal to at least 2 times that of the outer roller and, preferably, to at least 3 times.
- the modulus of the reinforcing element can be up to 20 times, and even more, than that of the material of the external element.
- the outer roller will usually be made of an inexpensive oxide material suitable for the manufacture of oven rolls, for example an oxide material baked at moderate temperature, such as the aforementioned alumina-mullite cordierite material. .
- an oxide material baked at moderate temperature such as the aforementioned alumina-mullite cordierite material.
- Such a material typically has a modulus of elasticity at 1200 ° C of 10 to 25 GPa.
- the wall thickness of the outer roller is typically of the order of 5-6 mm, without these values being of critical importance.
- the internal reinforcement element can have various shapes, for example that of a hollow cylinder or that of a hollow bar with hexagonal, square, triangular section or an X-shaped profile.
- a hollow cylindrical reinforcing element that is to say in the form of a tube, having a wall thickness of the 1.5 to 4 mm.
- the reinforcing element can be made, for example, of a material based on oxides baked at high temperature, such as a material based on alumina, alumina-mullite or mullite or a material based on at least one silicon compound such as those mentioned above, among others.
- Materials based on alumina, alumina-mullite or mullite baked at high temperature typically have a modulus of elasticity at 1200 ° C of 50 to 200 GPa, while materials based on at least one compound of silicon typically have a modulus of elasticity at 1200 ° C from 150 to 400 GPa.
- the internal reinforcement element advantageously has a length less than or equal to 0.9 times that of the external roller to be reinforced.
- a reinforcing element 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 approximately 0.5 to 2 m.
- 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 to allow the reinforcing element to be put in place and exert its action as soon as the outer roller bends a little under a load. For example, a clearance of 0.1 to 0.5 mm is usually satisfactory without these values being critical.
- the reinforcing element will advantageously be centered with respect to the supports of the roller on the bearings of the oven supporting the roller, or also with respect to the loads supported by the roller in service, so that the external oxide-based roller is reinforced. mechanically in the area where the maximum bending stress prevails in service.
- the single figure is a view, in longitudinal section, of a composite roller according to the invention.
- the reference 1 designates the exterior oxide-based roller
- the reference 2 a reinforcing element in the form of a tube and of length shorter than that of the exterior roller
- the reference 3 designates the areas 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, for example a toothed wheel (not shown).
- the reinforcing element 2 was made of ADVANCER (Sic grains bound by a silicon nitride binder sold by the company Norton) and had the following characteristics:
- rollers thus produced were mounted in a roller oven intended for firing ceramic tiles at a temperature of the order of 1200 ° C.
- the deflection measured is 6.0 mm for the composite rollers of the invention supporting the same load.
- the present invention therefore makes it possible to obtain performance in service much higher than that of rolls based on standard oxides at a cost lower than that of rolls made of material baked at high temperature and much lower than that of rollers based on minus a silicon compound.
- the reinforcing element used in the invention has a volume much lower than that of a roller made entirely of high performance material, because its diameter, its wall thickness and its length can be much less.
- the invention also makes it possible to use the good hot stiffness of materials based on alumina, alumina-mullite or mullite baked at high temperature (overcooked), without risking rupture by thermal shock, when they are introduced into an oven on.
- the outer roller very resistant to thermal shock, constitutes a protective envelope for the internal reinforcement element, sensitive to thermal shock.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Tunnel Furnaces (AREA)
- Furnace Charging Or Discharging (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
Claims
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 true EP0769126A1 (fr) | 1997-04-23 |
EP0769126B1 EP0769126B1 (fr) | 1998-08-12 |
Family
ID=9464000
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95923366A Expired - Lifetime EP0769126B1 (fr) | 1994-06-08 | 1995-06-07 | Rouleaux ceramiques renforces pour fours |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0769126B1 (fr) |
CN (1) | CN1150474A (fr) |
DE (1) | DE69504080D1 (fr) |
FR (1) | FR2721098B1 (fr) |
TW (1) | TW296424B (fr) |
WO (1) | WO1995033965A1 (fr) |
Families Citing this family (1)
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)
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 |
-
1994
- 1994-06-08 FR FR9407013A patent/FR2721098B1/fr not_active Expired - Fee Related
-
1995
- 1995-06-06 TW TW84105651A patent/TW296424B/zh active
- 1995-06-07 EP EP95923366A patent/EP0769126B1/fr not_active Expired - Lifetime
- 1995-06-07 CN CN 95193477 patent/CN1150474A/zh active Pending
- 1995-06-07 DE DE69504080T patent/DE69504080D1/de not_active Expired - Lifetime
- 1995-06-07 WO PCT/FR1995/000733 patent/WO1995033965A1/fr active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9533965A1 * |
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 |
EP0769126B1 (fr) | 1998-08-12 |
TW296424B (fr) | 1997-01-21 |
CN1150474A (zh) | 1997-05-21 |
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