DE9412077U1 - Roller oven - Google Patents

Description

BOHN, Paul, Dipl.-Ing.
Roller oven

Description

The invention relates to a roller kiln with the features of the preamble of claim 1.

Such roller kilns for firing ceramic goods, consisting of a housing with rotating rollers made of high-temperature ceramics such as silicon carbide, aluminum oxide or the like that span the width of the kiln, as well as firing trays that are transported on the rollers, are known, for example, from the company MORI (Ceramic Magazine, 43rd year, No. 1, 1991). The rollers are driven from the outside via complex and failure-prone chain drives and thus transport the firing trays.

The object of the present invention is to create a roller kiln of the type described above, which is cost-effective and enables largely trouble-free operation.

This object is achieved with the features mentioned in the characterizing part of claim 1. Further developments and advantageous embodiments of the invention are included in the further claims.

According to the invention, the rollers in a roller kiln are driveless and rest with their ends on bearings arranged at the same height on the sides of the inner walls of the kiln, whereby the firing trays are pushed or pulled through the firing channel via the rollers.

The bearings are advantageously formed by two rotatably mounted flanged rollers made of high-temperature ceramic, the flange of which is arranged on the end facing away from the roller end. The flanged rollers are hollow cylinders that are mounted on axles made of high-temperature ceramic, which in turn are mounted at the end in a rotationally fixed manner between rails made of high-temperature ceramic arranged on the inner walls of the furnace.
10

With the exception of the first and last flange roller on each furnace side, each flange roller carries two rollers.

To eliminate faults, it is advantageous if lockable feed-through pipes are arranged in the furnace walls at the height of the rollers.

The firing trays can be connected to one another by undercuts, tongue and groove connections, etc., especially if several are arranged next to one another.

At the kiln entrance and exit, either pushing or pulling devices must be provided to transport the firing trays through the kiln intermittently or continuously.

Preferably, the roller kiln should be designed with two firing channels next to each other. 30

The invention is described in more detail below using drawings as examples.

Fig. 1 is a cross-section through a roller kiln; Fig. 2 is a side view of Fig. 1.

The roller kiln according to Fig. 1 and 2 consists in a known manner of a housing made of walls, ceiling and floor segments, as well as entrances and exits. The inner walls 1 have continuous, covered steps 2 along the firing channel, in which ceramic rails 3 are arranged parallel and spaced apart in the longitudinal direction. The ceramic rails have, for example, a �EEgr; profile, with the upper webs having recesses 3' at regular intervals in which flattened ends of axles 5 made of high-temperature ceramic rest. The axles 5 carry flanged rollers 4, the flanges 4' of which face the inner walls 1. Long rollers 6 made of high-temperature ceramic are mounted between and on two flanged rollers 4 at the end, on which firing material carriers 7 with firing material 8 are pushed or pulled through the kiln. The rollers and flanged rollers rotate in the same direction. Slippage is largely avoided by the very slow conveying speed. Damaged rollers 6 can be removed via normally closed passage pipes 9 in the walls. The rollers 6 must be dimensioned so that there is a distance to the wheel flanges 4' that allows the expansion of the rollers

5 compensated.

Claims (6)

BOHN, Paul, Dipl.-Ing. Roller kiln claims 1. Roller kiln for firing ceramic goods, consisting of a housing with rollers made of high-temperature ceramics such as silicon carbide, aluminum oxide or the like arranged to rotate therein and spanning the width of the kiln, and firing trays to be transported on the rollers, characterized in that the rollers (6) are driveless and rest with their ends on bearings arranged at the same height on the sides of the inner walls of the furnace (1), and that the firing trays (7) are pushed or pulled through the firing channel via the rollers (6). 2. Roller furnace according to claim 1, characterized in that the bearings are each formed by two rotatably mounted flanged rollers (4), the flange of which (4') is arranged on its end facing away from the roller end. 3. Roller furnace according to claim 2, characterized in that the flanged rollers (4) are hollow cylinders which are mounted on axles (5). 4. Roller furnace according to claim 3, characterized in that the axles (4) are fixed at their ends between the Rails (3) arranged on the inner walls of the furnace are supported. 5. Roller furnace according to claim 1, characterized in that, with the exception of the first and last flanged roller (4) on each furnace side, each flanged roller carries two rollers (6). 6. Roller furnace according to claim 1, characterized in that closable feedthrough tubes (9) are arranged in the furnace walls at the height of the rollers (6).