GB2040418A

GB2040418A - Kiln furniture setting

Info

Publication number: GB2040418A
Application number: GB7935214A
Authority: GB
Original assignee: Steuler Industriewerke GmbH
Current assignee: Steuler Industriewerke GmbH
Priority date: 1978-10-11
Filing date: 1979-10-10
Publication date: 1980-08-28
Also published as: FR2438809A1; DE2844281A1; IT7926373A0; FR2438809B1; IT1125476B; NL7907486A; GB2040418B

Abstract

Ware is supported on tongues 1a-1c projecting from plates 1 which have notches 2a-2c engaging notches 4a-4c on co-operating plates 4. <IMAGE>

Description

SPECIFICATION A kiln furniture setting for the single-pass firing of ceramic formed products on kiln cars The invention relates to a kiln furniture setting for the single-pass firing of ceramic formed products on kiln cars or similar travelling hearths, consisting of support columns which protrude above the platform of the car and are spaced apart, and whose free ends lying in a common horizontal plane form a bearing grate for the formed products.

Kiln furniture settings of this type afford the particular advantage that the bearing grate formed by the support columns contacts the ceramic formed products only at points, spaced out as desired at any time, and thus rarely prevents the combustion gases from reaching the surface of the formed products.

The vertically towering columns forming free lanes running in the direction of travel of the kiln car and transversely to this direction also permit the use of formed product depositing and lifting devices. The control levers of these devices are even capable of grasping beneath the bearing plane of the formed products as they move without contacting the elements of the kiln furniture setting and without being touched by these elements as the kiln car moves.

However, as support columns are invariably very narrow, it is difficult to fix the support columns on the car platform. The fixing must be mechanically strong enough to take up the torque produced by the weight of the formed products resting on the support columns as the kiln car starts up or brakes. It must also be able to withstand the quick succession oftemperature changes.

In a known embodiment of the kiln furniture setting of this type (German Patent No. 1 225 535), the support columns are designed as tubes held upright on the bearing frame of the kiln car platform by tension rods guided through their lengthwise centre. In this arrangement, the support columns penetrate through the heat-resistant insulating composition lying on the kiln car platform. A special foot which is also located, at least in part, in the insulating composition has to be provided for the support columns with this type of fixing and, moreover, the fitting and installation of the tension rod is very complicated.

However, a more serious disadvantage lies in the factthatthe insulating composition is penetrated in numerous places on the kiln car platform, thus necessitating additional means of insulating the car from the heat of the kiln, this being unnecessary when using continuous, uninterrupted insulating coverings. Another, no less important, disadvantage is that the car platform is heated relatively slowly, but the period for which the kiln car is located outside the kiln is frequently insufficient for re-cooling purposes, with the result that, after only a few kiln passes, the car platform is brought to a relatively high temperature which does not drop significantly, even outside the kiln, as the insulating composition obstructs the radiation of heat.The support columns and their holders also remain hot, if they are located inside the insulating composition, while any part of them which projects beyond the surface of the insulating composition is cooled. These temperature differences produce thermal stresses inside the support columns which can destroy the columns.

Kiln furniture settings consisting of frames made of refractory materials which rest on the insulating composition but do not penetrate it have therefore been developed. These frames, in turn, form the foundation for slip-on support pillars, and longitudinal or transverse cross-members whose upper sides then form bearing straight edges for the formed products are slipped on to the free ends of these pillars. In addition to the relatively high outlay for the individual elements forming the assembly, these designs have the disadvantage that they form a bearing grate consisting of individual points and that it is only possible to use to a limited extent depositing and lifting devices which grasp between and beneath these support points (of, German Offenlegungsschrift No. 2 063 486).

The object of the invention is to improve the known design of a kiln furniture setting with supports projecting above the kiln car platform, whose free ends form a bearing grid for the formed products, in such a way that the formed products can rest on the insulating composition of the kiln car platform without penetrating it. This object is achieved in that a grid of flat plates, which can be put together cross-wise in a manner knownperse by means of intermeshing notches, has tongue-like projections which run parallel to each other in the plane of the plates and form the support columns. The tongue-like projections can advantageously be arranged on the plates of only one of the two grid directions and the plates can be integral with the tongue-like projections.The tongue-like projections should also taper uniformly toward the free end and optionally have reinforcing ribs. The grid made up of the plates stands with its lower edge on the upper face of the car platform. The plane of the plates with the tongue-like projections preferably lies in the direction of travel of the kiln car since the tongue-like projections have the greater flexural strength. Grid portions can obviously be formed respectively from four, nine, sixteen or more tongue-like projections equidistant from each other, which stand next to each other and behind each other in rows on the kiln car platform and can optionally be exchanged individually in a simple manner if they are damaged. The elements of the setting consist of only two plate-like shaped parts which are easy to produce.

The invention will be described in more detail with reference to the embodiment illustrated in the drawings.

Figure 1 shows a view of the upright setting from one side.

Figure 2 shows the side view of Figure 1.

As shown in Figure 1, the flat plate 1 has three tongue-like projections 1 a, 1 b and 1 c in this arrangement. The free ends of the tongue-like pro jections are curved at the top, and a semicircular radius is formed between adjacent projections 1 a, 1 b or 1 band 1 c. The downward pointing bearing edge 2 of the plate 1 is provided with notches 2a, 2b and 2c.

The transversely running plate 4 which, in turn, has upward pointing notches 4a, 4b and 4c is inserted into the two external notches 2a and 2c from below (ef. Figure 2). A plate 1 with tongue-like projections 1 a, 1 b and 1 c is inserted into the respective notches 4a, 4b and 4c of two parallel plates 4. The plate 4 also has semicircular radii between the notches 4a, 4b and 4c, and each plate end protruding outwards has a quarter circle radius which then forms a semicircular radius with the adjacent plate 4. The tongue portions 1 a, 1 b and 1 c and also the remaining portions of the plate 1 as well as the plate 4 can have reinforcing ribs (not shown). The distance between the tongue portions 1 a, 1 band 1 c and the corresponding notches 2a, 2b and 2c in the plates 1 as well as the notches 4a, 4b and 4c in the plates 4 are selected in a manner known perse, so as to form the screen and therefore the bearing points at the free ends of the tongue portions, which allow standard ceramic formed products of, for example, 10 x 10, 15 x 15, 15 x 20 cm to be supported.

Claims

1. A kiln furniture setting for the single-pass firing of ceramic formed products of kiln cars orthe like, consisting of support columns which towerver- tically above the platform of the kiln car and are spaced apart, and whose free ends lying in a com mon horizontal plane form a bearing grate for the formed products, characterized in that a grid of flat plates 1,4 which can be intersected in a manner known per se by means of intermeshing notches 2a, 2b, 2c and 4a, 4b and 4c has tongue-like projections la, 1 band 1 c which run parallel to each other in the plane of the plate and form the support columns.

2. A kiln furniture setting according to claim 1, characterized in that the tongue-like projections 1 a, ib and 1c are arranged on the plates 1 in only one of the two grid directions.

3. A kiln furniture setting according to claims 1 and 2, characterized in that the plates 1 are integral with the tongue-like projections 1 a, 1 b, 1 c.

4. A kiln furniture setting according to claims 1 to 3, characterized in that the tongue-like projections 1 a, 1 b, 1 c taper uniformly toward the free end.

5. A kiln furniture setting according to claims 1 to 4, characterized in that the free end of the tongue-like projections 1a, 1b, 1c is curved at the top.

6. A kiln furniture setting according to claims 1 to 5, characterized by a semicircular radius formed between adjacenttongue-like projections la, 1b, 1c.

7. A kiln furniture setting according to claims 1 to 6, characterized in that an independent grid portion is formed from four, nine, sixteen or more tongue like projections equidistant from each other.

8. A kiln furniture setting according to claims 1 to 7, characterized in that the plane of the plate 1 with the tongue-like projections 1 a, 1 b, 1 c lies in the direction of travel of the kiln car.

Application No.7935214. New claims or amendmentsto claims filed on 23.10.79.

9. A kiln furniture setting for the single-pass firing of ceramic products on kiln cars for example, comprising a plurality of plates each of which has slots to enable the plates to be interfitted to form a grid-like structure, at least some of the plates having parallel tongue-like projections which form support columns, the ends of the tongues constituting a bearing grateforthe products.

10. A kiln furniture setting substantially in accordance with any embodiment (or modification thereof) of the invention claimed in claim 9 and described and/or illustrated herein.