JPS58691Y2 - Batch furnace lid sealing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lid sealing device for a batch furnace.

As shown in Figure 1, conventional batch furnaces
A furnace cover d is placed on the side wall C of the furnace body housing the furnace body A.

This lid d is movably suspended from a cart (none of which is shown) running on a rail installed above it via a lifting device consisting of a motor, a speed reducer, a rod crank, a hanging rod, etc. .

As shown in Fig. 2, a seal plate f is provided on a frame e provided at the periphery of the iron lid d, and a seal plate f is provided to protrude downward, and a seal plate f is provided on the frame e provided at the periphery of the iron lid d, and a seal plate f is provided to protrude downward. It is buried in the sand to seal the outflow of combustion gas inside the furnace.

Note that in FIG. 1, i indicates a burner and j indicates a waste gas port.

However, in such a sealing device, due to thermal changes within the furnace, the gap X shown in FIG. l:y is usually 25m
However, due to the deformation of the frame e, this amount reached about 80 mm, causing problems such as the seal breaking, and the load of the furnace cover being applied to the curved tile g, causing damage to the curved tile g.

In order to compensate for these inconveniences, a device shown in FIG. 3 has been devised and is used in some cases.

That is, in the same figure, a ceramic fer)k is fixed to the upper end of the side wall C of the furnace body by a stopper m and a ferrule)n, and a seal plate)f attached to the lower surface of a frame e of the furnace lid d and a ceramic ferrite The felt k is used to maintain the seal.

However, even in the structure shown in Fig. 3, the level of the frame e and side wall C varies depending on the location of the cross section due to temperature changes in the furnace, and the pressing dimension X' of the ceramic fer (k) changes, causing a seal. If a gap is created between the plate f and the ceramic felt, or if the side wall C
Abnormal force may be applied to the product and damage it.

Another disadvantage is that scale generated from the ingot during extraction of the ingot falls onto the ceramic felt, shortening the life of the ceramic felt.

There is also a known sealing device in which ceramic fibers are attached around the furnace lid with bolts and nuts, but since the ceramic fibers are folded into a blanket shape, if scale builds up on the curved tiles,
It is not possible to obtain sufficient sealing performance around the scale, and since the mounting means is done using bolts and nuts, the bolts and nuts are likely to seize during use, and if they are replaced, it may be necessary to replace them. However, the disadvantage is that it requires a lot of effort.

The present invention aims to eliminate the drawbacks of the conventional sealing device, and one embodiment thereof will be described with reference to FIG. 4.

In FIG. 4, 1 is a furnace body, 2 is a side wall of the furnace body, and 3 is a furnace lid.

A presser plate 5 is attached to the outer side of the lower end of the frame 4 of this furnace cover 3, and supports 6 and 7 are attached to the inner side. The holding plate 5 also has a lower end bent inward to facilitate support of the ceramic fibers 8.

This ceramic fiber 8 compresses the upper part and presses the presser plate 5.
It is inserted inside the supports 6 and 7 and pressed together with adhesive 10 to the lower end of the frame 4 of the furnace lid 3. In FIG. 4, the furnace lid 3 is shown in a closed state. In this case, the ceramic fiber 8 is pressed against the sealing material 9 in a state where the lower end, which was a free end due to drooping, is slightly bent.

The ceramic fiber 8 has a felt or cross shape.

As described above, the present invention provides a batch furnace in which a furnace lid is movably arranged on the side wall of the furnace body, which is equipped with a presser plate on the outside of the lower end of the furnace lid frame and a support on the inside. The lower part of the holding plate and the lower part of the support are bent or arcuate to support the ceramic fibers, and the lower end is a free end, which presses against the sealing material in the curved tile on the upper side wall of the furnace body. As shown in the figure, the ceramic fiber is provided with the upper end glued to the lower end of the frame of the furnace cover and the upper part supported by the presser plate and the support and hangs down. In the conventional type shown in Fig. 2, if the seal part were torn, the hot gas inside the furnace would burn out the seal plate and deform the frame of the furnace body. Even if hot gas leaks, it will only escape through the lower ends of the ceramic fibers, and the hot gas will not come into direct contact with the furnace frame, so the frame will not be deformed and the frame will have an insulating effect.

Moreover, compared to the conventional type shown in Figure 3, the free end of the lower tip of the ceramic fiber is pushed into the sealing material, so there is no unreasonable pushing force applied to the ceramic fiber, and the lifespan is extended. It is longer and seals well,
However, since the scale that falls from the ingot does not adhere, there is no burnout.

Furthermore, in the case of repairs, the seal plate in the device shown in Figure 2 is welded to the frame, making it difficult to install and remove, and in the device shown in Figure 3, the furnace lid must be removed so that a worker can stand above the furnace. However, with this invention, the furnace cover is moved away from the furnace top and the ceramic fibers are simply replaced.
Repairs are extremely easy.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional batch furnace, Figure 2 is an enlarged view of the furnace lid seal in Figure 1, and Figure 3 is another conventional furnace lid seal corresponding to Figure 2. FIG. 4 is a sectional view of an embodiment of the present invention. 1...Furnace body, 2...Furnace body side wall, 3...
... Furnace lid, 4 ... Frame, 5 ... Pressing plate, 6, 7 ... Support tool, 8 ... Ceramic fiber, 9. ...Sealing material, 10...
...adhesive material.

Claims (1)

[Scope of utility model registration request] In a batch furnace in which a furnace cover is movably arranged on a side wall of the furnace body, a holding plate is provided on the outer side of the lower end of the furnace cover frame, and a support is provided on the inside, and the lower part of the holding plate and the lower part of the support are provided. has a bent or arcuate shape to support the ceramic fibers, and its lower end is a free end, and the upper end is attached to the furnace lid so that it is crushed by the sealing material in the curved tile at the top of the furnace side wall. A furnace lid sealing device for a batch furnace, comprising a ceramic fiber that is bonded to the lower end of the frame and hangs down with the upper part supported by the presser plate and the support.