JPS6340788Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a joint structure of beams disposed inside a furnace such as a heating furnace or a boiler.

[Technical background] Beams are installed inside various furnaces for various purposes. For example, before hot rolling a hot steel material, it is often done to reheat the edges of the hot steel material to make the temperature distribution of the hot steel material uniform. To achieve this, a large number of support beams are installed horizontally on the ceiling side of the furnace, and on top of the support beams, a large number of breathable solid plates are placed on the top surface of the hot steel material being transported in the furnace length direction. It is used to arrange tatami mats facing each other. In addition,
Here, the term "breathable solid" refers to a solid having an appropriate thickness formed by molding a heat-resistant material such as metal or ceramic into a shape having breathability, such as a net shape, a honeycomb shape, a fibrous shape, or a porous shape.

By the way, in this example, both ends of the beams that support the air permeable solid plate are generally made by drilling holes in the furnace wall and supporting them in the holes, but each beam has a continuous length. If it is a large piece, it is extremely difficult to carry it into the furnace and install it into the hole from the inside of the furnace. A through hole is drilled in the wall where the beam is attached, and the beam is inserted into the furnace through there. However, these long beams are not only inconvenient to carry into the furnace and to handle when installing and removing from the furnace, but also require considerable effort to drill through holes in the thick furnace wall. There were many disadvantages, such as the heat leaking through the through hole, causing heat loss, and the need for sufficient space outside the furnace to allow the beam to be inserted into the furnace through the through hole.

On the other hand, in order to solve this problem, it is conceivable to join short beams together in a furnace. However, metal beams can be easily joined together by welding, but when the temperature inside the furnace reaches a high temperature of 1000℃ or more, cooling water must be circulated through the beam to cool it down. There are problems with piping or heat loss. Therefore, ceramic beams with excellent heat resistance are desired, but there is a problem that ceramic beams cannot be welded in any way.

[Purpose of the invention and technical means] The purpose of the invention is to facilitate the installation of ceramic beams inside the furnace. A furnace beam joint in which a hole is provided, one end of the ceramic beam is fitted into the non-through hole, and a ceramic joint is inserted loosely between the opposing ends of the ceramic beams at the other end in a male-female mating manner. The gist is structure.

[Example] In Fig. 1, reference numerals 1a and 1b are non-through holes made in the opposing inner walls of the furnace, and a receiving plate 2 is placed on the inner lower surface of the holes, and ceramic fibers are bundled in layers in the inner part to provide appropriate elasticity. It is equipped with an elastic body 3 having the following properties. Reference numerals 4a and 4b are ceramic beams formed from silicon carbide ceramic material into a round pipe shape, and a felt 5 made of ceramic fiber is adhered to the outer periphery of one end of each ceramic beam 4a and 4b using mortar adhesive. Winding, the non-through holes 1a, 1b
I try to support myself internally. Reference numeral 6 denotes a hollow pipe-shaped ceramic joint made of a silicon carbide ceramic material with a square outside and a circular hole inside into which the ceramic beams 4a and 4b can be loosely inserted. A small hole 7 communicating with the hollow interior is opened. 8 is the small hole 7
A retaining pin that is inserted into the ceramic joint 6 to partition its hollow interior is shown. However, in order to install the ceramic beams 4a and 4b in the furnace, first insert one of the ceramic beams 4a into the non-penetrating hole 1a from the side where the felt 5 is wrapped, and support the ceramic beam 4a. The ceramic joint 6 is loosely inserted into the outer periphery of the inner end of the furnace, and then the side of the other ceramic beam 4b where the felt 5 is wrapped is inserted into the non-through hole 1.
Then, the ceramic joint 6 is moved toward the other ceramic beam 6b and loosely inserted into the outer periphery of the ceramic beam 4b to join. Finally, insert the stop pin 8 into the ceramic joint 6 through the small hole 7. As shown in this embodiment drawing, the distance l from the position of the stop pin 8 to the end face of the ceramic beam 4a or 4b is set to be longer than the depth L of the non-through hole 1a or 1b. Ceramic beams 4a, 4b can be easily attached to non-through holes 1a, 1b. Also,
Ceramic beams 4a, 4b and ceramic joints 6
At least one of the contact surfaces of the loosely inserted portion is coated with an oxide such as alumina, mullite, or zirconia to prevent fusion due to glassy substances eluted from both materials.

FIG. 4 shows another embodiment of the joint portion of ceramic beams 4a and 4b.
That is, a plurality of small holes 7', 7'... are bored in the ceramic joint 6', and two of the small holes 7',
Fixing pins 8, 8 are inserted into 7' to lock the opposing end surfaces of the ceramic beams 4a, 4b, respectively.

FIG. 5 shows still another embodiment in which the male-female fitting relationship between the ceramic beams 4a and 4b and the ceramic joint 6'' is reversed from that of the previous embodiment, that is, the outer periphery of both ends of the ceramic joint 6''. The ends of ceramic beams 4a and 4b are loosely inserted into the ends. In this embodiment, small holes 7'' and 7'' for fixing pins 8 are bored in the ceramic beams 4a and 4b, respectively, and the movement of the ceramic joint 6'' is restricted by the fixing pins 8 and 8 inserted therein. There is.

In each of the above embodiments, two ceramic beams are joined together, but in short, the present invention enables the ends of adjacent ceramic beams to be joined together via a ceramic joint. Needless to say, it can also be applied to joining three or more ceramic beams.

[Effects of the invention] Ceramic beams can be easily joined in a furnace,
Furthermore, the inconvenience of having to drill through holes in the furnace wall as in the conventional method can be eliminated, resulting in excellent workability and economical efficiency. Furthermore, by joining ceramic beams together, thermal expansion or contraction can be absorbed more smoothly than in the case of a single long beam, and the buckling phenomenon that tends to occur with long ceramic beams can be avoided, ensuring operational stability. It has many advantages.

[Brief explanation of the drawing]

The figures are related to the present invention. Figure 1 is a vertical sectional view showing the main parts inside the furnace, Figure 2 is an enlarged view of the cross section taken along the line X-X in Figure 1, and Figure 3 is the Y - An enlarged view of the Y-line cross section, Figure 4 is a longitudinal cross-sectional view showing another embodiment of the jointed portion of ceramic beams, and Figure 5 is a longitudinal cross-sectional view showing yet another embodiment of the jointed portion of ceramic beams. It is a front view. 1a, 1b...non-through holes, 4a, 4b...ceramic beams, 6, 6', 6''...ceramic joints.

Claims (1)

[Scope of utility model registration request] A non-through hole is provided in the opposing inner walls of the furnace, one end of the ceramic beam is fitted into the non-through hole, and a ceramic joint is inserted between the opposing ends of the ceramic beams at the other end in a male-female mating manner. A joint structure of furnace beams that is characterized by being inserted.