JPH047509Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a tunnel furnace, and particularly to inter-row bricks of a tunnel furnace having a plurality of rows of bed plate transfer paths.

<Conventional technology> Tunnel furnaces are used for firing ferrite, ceramics, etc. Workpieces mounted on a bed plate are sent into the tunnel furnace one after another, and the length of the tunnel furnace and the moving speed of the bed plate are The temperature of the tunnel furnace, the composition of the atmospheric gas inside the tunnel furnace, the pressure inside the furnace, etc. are adjusted so that the desired product can undergo the prescribed heat treatment within the prescribed time determined by the tunnel furnace. It is made so that it can be obtained at the exit of the

Typically, tunnel furnaces have a lower part and an upper part, lined with a heat-resistant material, e.g. brickwork, bounded by a conveyed bedplate, which is bounded by the upper surface of the lower brick. It is supported by the rail section. It has also been proposed to provide a plurality of transfer rows of bed plates to increase the production volume.

<Problem to be solved by the invention> In a tunnel furnace having a plurality of bed plate transfer rows, at least one row of intermediate bed plate support bricks and two rows of end bed plate support bricks are provided, and the intermediate bed plate supports The bed plate is supported in the opposing L-shaped cross-sectional recesses provided in the plate support brick and the end bed plate support brick, and is transferred, and the workpiece supported on the bed plate is heat-treated. in this case,
It is desired to maintain the temperature of the workpiece, the composition of the atmospheric gas, the pressure inside the furnace, etc. within desired ranges, and for this purpose it is necessary to appropriately manage the space inside the furnace. When a plurality of bed plate transfer rows are provided, excessive spaces are formed between the rows, creating a problem in achieving good management.

The object of the present invention is to provide inter-row bricks for tunnel furnaces that solve the problems in the prior art described above.

<Means for Solving the Problems> According to the present invention, bricks are installed between the rows of a tunnel furnace having multiple rows of bedplate transfer paths, and are formed into columnar shapes extending from the bedplate supporting floor surface to the ceiling. A plurality of inter-row bricks for a tunnel furnace are provided spaced apart along the length of the furnace.

Preferably, the bricks have a polygonal or teardrop shape in horizontal section with an acute angle in the upstream direction of the air flow in the furnace.

<Function> By providing a plurality of column-shaped inter-row bricks between a bed plate row and an adjacent bed plate row, the lateral distance between the workpiece and the workpiece can be appropriately controlled. It can be easily managed, and since it is not completely isolated by walls, the advantages of having multiple rows can be enjoyed.

<Example> Fig. 3 is a schematic diagram of a tunnel furnace, in which 1 is a passage, 2 is a brickwork, and the workpiece moves in the passage 1 from left to right in the direction of arrow A. A heating zone, a firing zone, and a cooling zone are formed in the furnace from left to right.

FIG. 4 shows changes in desirable furnace temperature B, furnace pressure C, and oxygen content D of the furnace atmosphere when, for example, soft ferrite is fired in the tunnel furnace of FIG. To obtain such a curve, normally slightly overpressure air and oxygen are introduced from the exit 3 side of the tunnel furnace, an appropriate shielding sheet is provided between each zone, and air or oxygen is added in the desired zone. These methods are well known and will not be described in detail.

Figure 1 shows multiple rows inside the tunnel furnace.
FIG. 3 is a cross-sectional view of the case where rows of workpiece transfer paths are provided, in which the workpieces 5 are each placed on a bed plate 6 and transferred in a direction perpendicular to the drawing. 7, 7 is an end base plate support brick, 9 is a center base plate support brick,
Each has holes 8 and 10 that allow gas to pass from the lower space 11 to the upper space 12. Gas flowing from the lower space 11 to the upper space 12 improves thermal efficiency and facilitates control of the furnace atmosphere.

Although it is desirable that the space around the workpieces 5 be as uniform as possible, the presence of the center bedplate support brick 9 tends to create an excessive space between the workpieces 5 in both rows. According to the present invention, a plurality of pillar-shaped inter-row bricks 14 extending to the ceiling 13 are provided on the central bed plate supporting brick 9 at intervals in the longitudinal direction of the tunnel furnace. In FIG. 2, one of the inter-row bricks 14 closes the hole 10 of the central base plate support brick 9, but whether or not it is closed depends on the purpose and effect of the atmosphere control.

In the illustrated embodiment, each interrow brick 14 has a polygonal shape in horizontal section with an acute corner 14a, the acute corner 14a being in the upstream direction of the airflow direction (preferably in the opposite direction of the workpiece movement). This facilitates control of the effective space between the workpieces 5,5.

A teardrop shape may be used instead of a polygonal shape.

The embodiments described above are merely illustrative, and the length,
Various modifications in height, other shapes, arrangements, etc. may be made within the scope of the present invention.

<Effects of the invention> According to the invention, by providing a plurality of column-shaped inter-row bricks between a row of bedplates and an adjacent row of bedplates, the lateral distance between the workpiece and the workpiece can be appropriately maintained. The atmosphere inside the furnace can be easily managed, and since it is not completely isolated by walls, the disadvantages of having multiple rows can be eliminated and the advantages can be enjoyed. can.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a tunnel furnace having inter-row bricks according to the present invention, Fig. 2 is a sectional view taken along the line - in Fig. 1, and Fig. 3 is a schematic vertical sectional view of the tunnel furnace. FIG. 4 is a diagram showing the temperature, pressure, and atmospheric components of the tunnel furnace of FIG. 3. 5... Workpiece, 6... Base plate, 7, 9... Base plate support brick, 8, 10... Hole, 13... Ceiling, 14...
...Brick between rows, 14a...Sharp corner.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Bricks installed between rows of a tunnel furnace having multiple rows of bed plate transfer paths, forming columnar shapes extending from the bed plate supporting floor surface to the ceiling and spaced apart in the longitudinal direction of the tunnel furnace. Bricks between rows of a tunnel furnace characterized by having a plurality of bricks placed therein. 2. The inter-row brick for a tunnel furnace according to claim 1, characterized in that the brick has a polygonal or teardrop-shaped horizontal cross section with an acute angle in the upstream direction of the airflow in the furnace.