JPS6335354Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of support beams disposed inside various industrial furnaces.

[Prior art and its problems] A plate-like solid of an appropriate thickness (hereinafter referred to as a breathable A solid plate (referred to as a solid plate) is placed on the ceiling of the furnace leading to the flue, facing the object to be heated, and the combustion exhaust gas in the furnace is made to flow through this permeable solid plate to absorb the sensible heat of the combustion exhaust gas. In order to save energy in industrial furnaces, it has been conventionally done to effectively heat the objects to be heated by transmitting the radiant heat to an air-permeable solid plate and emitting it as radiant heat to the objects to be heated in the furnace. In this case, horizontal beams are installed inside the furnace to support multiple air-permeable solid plates on the ceiling of the furnace, but in this case, the metal beams are cooled when the temperature inside the furnace reaches a high temperature of approximately 1000℃ or higher. If the water is not circulated, it will be damaged due to overheating, so there are problems with the cooling water piping and the associated heat loss. Therefore, ceramic beams with excellent heat resistance are appropriate under such high temperatures, but even if ceramic beams are used, in the above example of use, a permeable solid plate is simply placed on the beam. If the air-permeable solid plate is supported only by the support surface, there is a risk that the air-permeable solid plate may shift on the beam due to the vibration of the furnace or the repeated thermal expansion and contraction of the beam itself, and may fall off the supporting surface of the beam. The problem is how to support the board. Therefore, the first option that can be considered is to directly bond and fix the breathable solid plate to the beam with an adhesive, but this requires applying a ceramic-based adhesive as the adhesive and then firing it in a firing furnace. In terms of handling such as transporting and installing the product, it is practically impossible. Another possible method would be to bolt or pin the breathable solid plate to the beam using bolts or pins, but in this case the breathable solid plate would not be able to follow the thermal expansion and contraction of the beam. There is a problem in that if excessive stress is applied to ceramic beams or air-permeable solid plates that are weak against shearing forces, they may crack and break. Due to such circumstances, it is necessary to support the air permeable solid plate without fixing it to the beam, and to prevent it from slipping off the beam.
Figures 4 to 6 exemplify possible means for this purpose. First, the method shown in Figures 4 and 5 is one in which one of the ceramic beams a is bonded using adhesive means. A blocking plate b or blocking pin b' also made of ceramic material is installed in the center of the side outer surface, and a plurality of beams configured in this way are arranged in parallel inside the furnace, and a permeable solid plate is placed on top of them. Then, both sides of the air-permeable solid plate are received by blocking plates b or blocking pins b' on the beam, but in the example of blocking plate b shown in Fig. 4, a ceramic adhesive is applied. When fired, the beam warped, and the stop pin shown in Figure 5
In example b', although there is no warping of the beam, the bonding area is small and the bonding strength is low. Furthermore, in either case, there is the inconvenience that once the blocking plate b or blocking pin b' is adhered to the beam a, care must be taken in handling it so as not to break it. On the other hand, in the case shown in Fig. 6, the stop pin b'' is removably attached to the ceramic beam a by screwing means, but the screws are cut in the fired beam. It is very difficult to make because its hardness is comparable to that of diamond, and if you cut the threads before firing to avoid this, the threads will become deformed and become useless after firing. There is also the disadvantage that thread cutting itself is costly.

[Means for Solving the Problems] Therefore, the present invention is a structure of an in-furnace support beam that is effective in preventing horizontal displacement of the mounting plate thereon, which allows the beam to be processed easily and inexpensively, and which allows for easy and inexpensive processing of the in-furnace support beam. The purpose is to provide a device that is easy to carry in and install, and that is easy to maintain during use. To this end, the present invention forms a non-through hole in the flat side surface of a ceramic beam having at least one flat outer surface, and a ceramic pin is removably inserted into the non-through hole. The ceramic beam is characterized in that a portion thereof is configured to protrude from the ceramic beam.

[Example] In FIG. 1, a ceramic beam 1 is mainly made of recrystallized silicon carbide and is formed into a rectangular hollow shape with a substantially square outside and a circular hole inside. Reference numeral 2 denotes a non-through hole formed on one side of the ceramic beam 1. The non-through hole 2 is formed so as to communicate with the hollow interior of the ceramic beam 1 but not to penetrate through the opposite side of the ceramic beam 1. 3 is a ceramic pin made of the same fine ceramic material that is removably inserted loosely into the non-through hole 2; the length of the ceramic pin 3 is such that when it is inserted into the non-through hole 2, the head thereof is similar to the ceramic beam 1; The dimensions should be made to protrude more.

As shown in FIG. 2, a plurality of ceramic beams 1 are arranged in parallel at appropriate intervals with the side where the non-through holes are formed facing upward, and a permeable solid plate 4 is placed on the ceramic beams 1. . Then, a ceramic pin 3 is inserted into the non-through hole 2 so that the protruding portion from the ceramic beam 1 receives both sides of the air permeable solid plate 4. In this way, even if there is vibration inside or outside the furnace or thermal expansion or contraction of the ceramic beam 1, the permeable solid plate 4 will be prevented from slipping and falling off the support surface of the ceramic beam 1 because the ceramic pin 3 will restrict its displacement. (There is only some movement in the axial direction of the ceramic beam 1.) Note that the cross-sectional shape of the hollow interior of the ceramic beam may be rectangular as shown in Fig. 3; Hollow beams are effective in reducing weight.

Furthermore, the external shape of the ceramic beam does not necessarily need to be rectangular as shown in FIG. 1 or FIG. It is sufficient if the outer surface is formed into a flat shape. Further, when the ceramic beam is not made into a hollow beam, it is sufficient to form an ordinary blind hole as the non-through hole, although not shown. It should be noted that the plate placed on the ceramic beam 1 is not limited to the above-mentioned air permeable solid plate, but can of course be applied to non-air permeable plates in general.

[Effects of the invention] Not only does it have the effect of preventing lateral displacement of the mounting plate on the beam, but it also facilitates machining because it is only necessary to drill a hole slightly larger than the ceramic pin before firing the ceramic beam as a non-through hole. It can be done easily and inexpensively. In addition, the ceramic pin can be brought into the furnace with the ceramic pin removed, and the ceramic pin can be inserted into the non-through hole when supporting the mounting plate on the ceramic beam, making installation easy. Maintenance such as replacement is also easy.
Furthermore, by using recrystallized silicon carbide for ceramic beams, which has particularly excellent high temperature strength and thermal shock resistance among ceramic materials, it has many advantages such as permanent use, and is extremely useful in practice. It is something.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention; Fig. 1 is a cross-sectional view, Fig. 2 is a plan view showing the state of use, and Fig. 3 is a cross-sectional view showing another embodiment of the present invention. , and FIGS. 4 to 6 are examples shown for comparison with the present invention. 1...Ceramic beam, 2...Non-through hole, 3...
Ceramic pin.

Claims (1)

[Claims for Utility Model Registration] 1. A non-through hole is formed in the flat side surface of a ceramic beam whose outer surface on at least one side is formed into a planar shape, and a ceramic pin is removably inserted into the non-through hole. 1. A support beam structure in a furnace, characterized in that a head of a ceramic pin is configured to protrude from the ceramic beam. 2. A request for registration of a utility model characterized in that a ceramic beam is hollow and a non-penetrating hole is formed so as to communicate with the hollow interior of the ceramic beam, but not to penetrate through the opposite side of the ceramic beam. The support beam structure inside the furnace described in item 1. 3. The support beam structure in a furnace as set forth in claim 1 or 2 of the utility model registration claim, characterized in that the ceramic beam is formed of recrystallized silicon carbide.