GB2080927A - Tunnel heating apparatus - Google Patents
Tunnel heating apparatus Download PDFInfo
- Publication number
- GB2080927A GB2080927A GB8118762A GB8118762A GB2080927A GB 2080927 A GB2080927 A GB 2080927A GB 8118762 A GB8118762 A GB 8118762A GB 8118762 A GB8118762 A GB 8118762A GB 2080927 A GB2080927 A GB 2080927A
- Authority
- GB
- United Kingdom
- Prior art keywords
- enclosure
- heating apparatus
- tunnel
- support surface
- tunnel heating
- 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
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
- F27B9/243—Endless-strand conveyor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Tunnel Furnaces (AREA)
Abstract
A tunnel heating apparatus in accordance with this invention comprises a tunnel-like enclosure, electric or gas heaters (34) disposed in said enclosure, an endless conveyor incorporating a continuous support surface extending through the enclosure and composed of elements (14), carrier means (16) for said elements, each element when located in the enclosure comprising an upper portion (47) which includes part of said support surface and a lower portion having a different width to said upper portion, said part of said support surface comprising ceramic fibre material, side walls (46) of the enclosure being disposed in complimentary closely spaced relationship to said portions thereby to provide a thermal baffle and transporter means (18) of lesser width than said lower portion disposed below the latter. Preferably said lower portion has a greater width than said upper portion. <IMAGE>
Description
SPECIFICATION
Tunnel heating apparatus
This invention concerns tunnel heating apparatus,that is to say apparatus of generally elongated construction through which articles are progressed to be~ heated. There aremany industrial examples of such apparatus, as for example, kilns for heat-treating ceramic articles a'nd vens for baking edible products, and some of these incl'ude conveyor moans on which the articles or produdts are placed and are then con'eyed through the kiln or oven. Difficulties have been experienced, especially where quite high temperatures are involved, in connexion with the conveying means.In one such kiln the conveyor consists of a series of transverselydisposed articulated members which present a support surface for articles to be passed through the'kiln which'consists of ceramic fibres. However, because of the high temperatures involved it has proved necessary to incorporate an elaborate water-cooling system for parts of the conveyor structure.' ' It is an object of the present invention to provide a tunnel heating apparatus incorporating a conveyor structure, which is capable of operating at quite high temperatures and-in which elaborate cooling arrangements for the conveyor structure are not necessary.
According to the present invention a tunnel heating apparatus comprising a tunnel-like enclosure, heating means disposed in said enclosure, an endless conveyor incorporating a continuous support surface extending through the enclosure and composed of elements, carrier means for said elements each element when located in the enclosure comprising an upper portion which includes part of said support surface and a lower portion having a different width to said upper portion said part of said support surface comprising ceramic fibre material, side walls of the enclosure being disposed in complimentary closely spaced relationship to said portions thereby to provide a thermal baffle and transporter means of lesser width than said lower portion disposed below the latter. Preferably the width of the lower portion is greater than the width of the upper portion.
By high temperatures we mean in excess of 800"C.
The invention will now be described further, by way of example only, with reference to the accompanying drawings, in which:
Fig. 1 is a side elevation partly in section, of a tunnel kiln constructed in accordance with the present invention, and
Fig. 2 is a sectional end view of the firing section of the kiln of Fig. 1.
Referring to'the figures, the tunnel kiln is of elongated construction. Its base 10 encloses a conveyor structure 12 which consists basically of ceramic fibre elements 14, carriers 1 6 therefor, and transporter means 18, together constituting an endless conveyor for articles to be conveyed through the kiln and heat-treated therein. Its sùperstnJcture 20 defines the upper region of a tunnel-22 having' a preheat section 24, a firing section 26 and a coolii'lg;section 28.
As more particularly illustrated in Fig. 2 the superstructure 20 has side walls and a iroof built up from suitable materials, basically an outer metal cladding 30 and inner layers 32 of heat resistant and heat insulating material, such as ceramic fibre material. Electrical heating elements 34 extend across the upper part of the firing section. Gas heating means may be alternatively employed. The preheat section 24 is of generally similar construction whilst the cooling section 28 does not require as much heat insulation. Beyond the exit end of the--enclosèd cooling section 28 the upper part of the convey' Or is subject to a flow of cooling air provided byb Lildv\ier system 36 +(Fig.1 1).
The endless conveyor and its relationship with the base 1 O will now be desc'ribed' in more detail.
Eac de'r'amid fibre elennertit '14'is made up of a number of~siices 47 cut from a blanket of ceramic fibres available cornirri'érciá-ily from various companies. For example one such suitable blanket is sold under the Registered Trade Mark SAFFIL by
Imperial Chemical Industries Limited. Each slice is the thickness of the blanket for example 4 cms.
The slices 47 of each element 14 are disposed alongside each other and are arranged longitudinally with a narrow face upwards when passing through the furnace. The slices 47 may be secured directly to a carrier 16 which compresses and supports the slices. A suitable carrier may incorporate a wire cage or basket 48 in which the slices are securely supported. The slices may be disposed upon a layer of furnace bricks 49 which are in turn supported on the carrier 16 as shown in
Figs. 1 and 2. The slices of each element may be disposed in any convenient arrangement for example, longitudinally or latitudinally or in the form of a matrix.The assembly of slices secured on a carrier 1 6 forms one sector of the endless conveyor of the shape shown in Fig. 2 - that is with an upper portion which provides a support surface, and a wider lower portion which is held by the carrier 1 6. The sectors together form an articulated arrangement (see Fig. 1) by virtue of their mounting on transporter means 18 which consist of linked shafts 38 carried in carrier brackets 40 as having rollers 42 at each end which run in tracks 44, the whole being driven by an electric motor (not shown). The shafts 38 and their rollers 42 lie directly beneath the carriers 1 6 and ceramic fibre elements 14 and completely within the compass of the latter. The upper parts 46 of the walls of the base 10 are stepped so as closely to conform to the shape of the endless conveyor, so forming a heat baffle which protects from heat to a considerable extent parts of the conveyor structure, especially the transporter means 1 8. As a consequence no elaborate cooling arrangements for that structure (and in particular no water cooling arrangements) are necessary.
In use the kiln is heated to the appropriate high temperature and the endless conveyor started- up to run at an appropriate speed. Ceramic articles are then placed on the support surface of the .endless conveyor at the entrance end of the kiln, conveyed through the tunnel where they are fired, and removed from the conveyor at the exit end of the kiln.
Claims (8)
1. A tunnel heating apparatus comprising a tunnel-like enclosure, heating means disposed in said enclosure, an endless conveyor incorporating a -continuous support surface extending through the enclosure and composed of elements, carrier
means for said elements, each element when
located in the enclosure comprising an upper
portion which includes part of said support surface
and a lower portion having a different width to
said upper portion said part of said support surface
comprising ceramic fibre material, side walls of
the enclosure being disposed in complimentary closely spaced relationship to said portions
thereby to provide a thermal baffle and transporter
means of lesser width than said lower portion disposed below the latter.
2. A tunnel heating apparatus as claimed in
Claim 1, wherein said lower portion has a greater width than said upper potion.
3.'A tunnel heating apparatus accprding to any preceding claim, wherein each element comprises a plurality of ceramic fibres members supported upon insulating bricks the latter being, supported by the carrier means.
4. A tunnel heating apparatus ap;cording-to Claim 1 or 2, wherein'fhe ceramic fibre merObfrs are directly supported by the carrier means.,,
5. A tunnel heating apparntus'a,ccqrding to
Claims 3 or 4 wherein said support surface comprises said members arranged longitudinally with respect to said surface.
6. A tunnel heating apparatus according to any preceding claim incorporating electrical heating means.
7. A tunnel heating apparatus according to any of claims 1 to 5 incorporating gas. heating means.
8. A tunnel heating apparatus substantially as hereinbefore described with referenece to Figs. 1 -and 2 of the accompanying drawiiigs.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8118762A GB2080927B (en) | 1980-06-19 | 1981-06-18 | Tunnel heating apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8020067 | 1980-06-19 | ||
GB8118762A GB2080927B (en) | 1980-06-19 | 1981-06-18 | Tunnel heating apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2080927A true GB2080927A (en) | 1982-02-10 |
GB2080927B GB2080927B (en) | 1983-11-23 |
Family
ID=26275938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8118762A Expired GB2080927B (en) | 1980-06-19 | 1981-06-18 | Tunnel heating apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2080927B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997031233A1 (en) * | 1996-02-22 | 1997-08-28 | Consultant Gas Engineers Limited | Tunnel kiln |
GB2326463A (en) * | 1996-02-22 | 1998-12-23 | Consultant Gas Eng Ltd | Tunnel klin |
GB2332503A (en) * | 1997-12-19 | 1999-06-23 | Jack Beaumont Kilns Limited | Tunnel kilns |
-
1981
- 1981-06-18 GB GB8118762A patent/GB2080927B/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997031233A1 (en) * | 1996-02-22 | 1997-08-28 | Consultant Gas Engineers Limited | Tunnel kiln |
GB2326463A (en) * | 1996-02-22 | 1998-12-23 | Consultant Gas Eng Ltd | Tunnel klin |
GB2332503A (en) * | 1997-12-19 | 1999-06-23 | Jack Beaumont Kilns Limited | Tunnel kilns |
GB2332503B (en) * | 1997-12-19 | 2000-10-25 | Jack Beaumont Kilns Limited | Tunnel kiln |
Also Published As
Publication number | Publication date |
---|---|
GB2080927B (en) | 1983-11-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 20010617 |