JPS6335276Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating furnace tube support structure, and more particularly to an improvement in a support structure that supports a U-bent portion (bent portion) of a vertical heating tube in a heating furnace from below.

Conventionally, when supporting heating tubes in a heating furnace from below, bolts 2 and nuts 3 are fixed to a hearth iron plate 1 by sandwiching washers 4 and then fillet welded. , U of heating tube 5 on bolt 2
Place the vent part 5A, bolt 2 and U vent part 5A
After welding, the hearth caster 6 is cast on the hearth iron plate 1 to a predetermined thickness, and a U is placed inside the hearth caster 6.
It was common to embed the vent portion 5A.

By the way, the U vent part 5A has erosion,
This is a location where phenomena such as corrosion such as corrosion and thinning of wall thickness occur easily, and it is necessary to continuously conduct wall thickness measurements, radiological inspections, etc., and monitor it. However, in the case of the conventional support structure as described above, the hearth caster 6 must be removed (hit with a chisel, etc.) for each inspection, and restoration work must be carried out again after the inspection, which is an extremely complicated task. I was being disciplined. Moreover, since the U-bent portion 5A was supported only by a relatively small fillet portion around the bolt 2, it was not always possible to secure the U-bent portion 5A in a sufficiently stable manner.

An object of the present invention is to provide a heating furnace tube support structure that allows for easy inspection of the U-bent portion and that can stably support the heating tube.

Therefore, the present invention is designed to
In the heating furnace tube support structure that supports the vent part from below, a reinforcing patch plate is applied to the bottom surface of the U-vent part, and a support pipe of a predetermined size is further suspended and fixed to the bottom surface of this patch plate. The support pipe supports the U-vent part above the hearth caster at a height position separated from the hearth caster by a predetermined distance, and by supporting the U-vent part above the hearth caster, the hearth The U-vent part can be inspected without removing the floor casters.
Moreover, due to the patch plate, a relatively large portion of the U
This object is achieved by stably supporting the U-bent part on the support pipe by supporting the vent part and performing fillet welding.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 2 shows a first embodiment of the heating furnace tube support structure according to the present invention. In the figure, a reinforcing patch plate 12 of a predetermined width is applied to the lower surface of the U-bent portion 11A of the heating furnace tube 11, and the peripheral edge of the patch plate 12 is located on the lower surface except for a part. Meat welded. This patch plate 12 is made of the same metal material as the U-bent part 11A, that is, the metal material that constitutes the heating furnace tube 11. Therefore, the welding strength between the two is extremely strong, and the heating of both The behavior below is now consistent. Also,
An air vent hole is bored in the center of the backing plate 12.

A support pipe 14 of a predetermined size is fixed to the lower surface of the backing plate 12 and suspended vertically downward. The upper end of the support pipe 14 is the backing plate 1
2 by fillet welding, and an annular flange plate 15 is welded and fixed to the longitudinally intermediate portion of the support pipe 14 in a direction perpendicular to the longitudinal direction of the pipe 14 by fillet welding. Note that it is desirable that the flange plate 15 be attached at a position approximately 50 to 100 mm from the backing plate 12.

The flange plate 15 is the flange plate 1
It is fixed on a receiving plate 16 having a diameter slightly larger than 5 by fillet welding. At this time, fillet welding is not performed all the way around the outer circumference of the flange plate 15. For example, the 270 degree range is welded, but the remaining 90 degree range is not welded for air venting. It is becoming. Further, the lower end side of the support pipe 14 is loosely inserted into the center of the receiving plate 16.

The receiving plate 16 is fixed by fillet welding onto the upper end edge of a guide pipe 19 erected on a hearth iron plate 18 of the heating furnace. Further, the lower end peripheral edge of the guide pipe 19 is fixed to the hearth iron plate 18 by fillet welding. A hearth caster 21 is installed on the hearth iron plate 18 to a position approximately at the same height as the guide pipe 19.
The upper end surface and the upper end surface of the receiving plate 16 are located at approximately the same height.

Note that the support pipe 14, flange plate 15, receiving plate 16, and guide pipe 1
9 are all made of a material that can withstand the temperature inside the furnace.

Next, the manufacturing procedure of this embodiment will be explained.

At the same time as manufacturing the heating furnace tube 11 having a structure of multiple bends and meandering, the manufacturing of the heating furnace frame is simultaneously progressed in parallel. The furnace frame can be manufactured in a relatively short time, and the position of the heating furnace tube 11 within the furnace frame is determined, and then the guide pipe 19 is erected at the corresponding position on the hearth iron plate 18 by fillet welding.
After the guide pipe 19 is attached, the receiving plate 16 is fixed to the upper end of the guide pipe 19, and the hearth caster 21 is driven up to the height of the fixed receiving plate 16.

It takes a relatively long time to cast the hearth caster 21 and dry it after casting, and during this time, the heating furnace tube 1
1, and each U vent part 11.
A support pipe 14 and a flange plate 15 are attached to the lower surface of A via a backing plate 12. In this way, the manufacturing process can be significantly shortened by simultaneously manufacturing the heating furnace tube 11 and manufacturing the hearth caster 21.

After the hearth caster 21 is dried, the support pipe 14 is inserted into the guide pipe 19, and the flange plate 15 and the receiving plate 16 are fillet welded as described above, thereby completing the entire manufacturing process.

This embodiment has the following effects.

The U vent part 11A is located on the upper side of the hearth caster 21 at a predetermined distance (for example, 50 to 100 mm) from the hearth caster 21.
Since the U-bent part 11A is exposed and supported at a height separated by a distance of about 100 mm, there is no need to remove the hearth caster 21 when inspecting the U-vent part 11A. Therefore, inspection of the U-bent portion 11A becomes extremely simple.
In addition, when the caster 21 is removed, restoration work is required after that, but in this embodiment, the caster 21
This eliminates the need for recovery work, and greatly improves workability after inspection.

Furthermore, since the U-bent portion 11A on the support plate 14 is supported via the backing plate 12, the U-bent portion 11A is supported by a relatively large portion, resulting in a stable supporting state. effective.

Further, since all of the parts of the support structure are connected to each other by welding, the support state is stable from this point of view as well, and manufacturing is easy.

Furthermore, although the parts of the support structure are connected to each other by welding, the support pipe 14 is configured so that it can be moved spatially (three-dimensionally) within the guide pipe 19, although not within such a wide range. has been done. This is mainly the flange plate 1
5 and the receiving plate 16, and the support pipe 14 can be tilted in various directions of 360 degrees around the positions of the plates 15 and 16. Therefore, the U-vent part 11A is not completely fixed to a certain point in the space, but the U-vent part 11A, that is, the heating tube 1
1, whose weight is only supported on the support pipe 14, and when thermal stress is applied, U
It is not fixed so as to prevent movement of the vent portion 11A. In other words, U vent part 11A
The (heating tube 11) is supported in a state where movement caused by thermal stress is allowed, and therefore, there is no force on the U-bent portion 11A (heating tube 11) side or on the support structure side such as the support pipe 14. In this respect, the heating tube 11 can be stably supported and is safe.

Furthermore, the support pipe 14 is a normal pipe body, has a simple structure, has excellent strength, is easily available, and can stably support the U-bent portion 11A even when it moves in various directions. .

Furthermore, according to this embodiment, the entire heating furnace can be manufactured easily as described above.

Next, embodiments other than those described above will be described, and the same reference numerals will be used for parts that are the same as or similar to those of the embodiments described above, and the explanation will be omitted or simplified.

A second embodiment is shown in FIG. In the second embodiment, a support plate 26 having a disk shape, for example, is fillet welded onto the guide pipe 19, and a support pipe 24 is fixed and erected on the support plate 26 by fillet welding. Furthermore, air vent holes 27 and 28 are formed in the support pipe 24 and the receiving plate 26, respectively.

According to such a second embodiment, the U vent part 1
1A tends to be a little narrower, but the first
It is possible to achieve substantially the same functions and effects as in the embodiment.

Further, FIG. 4 shows a third embodiment.
In this third embodiment, the support pipe 34 is directly welded and fixed onto the hearth iron plate 18. In this case as well, since the U-vent portion 11A is exposed and supported above the hearth caster 21, inspection is easy, and the structure is simpler than that of the first and second embodiments. Here, reference numeral 37 in the figure is an air vent hole.

In addition, in implementation, the backing plate 12 is not necessarily made of the same material as the U-bent portion 11A, but if it is made of the same material, the above-mentioned effects can be achieved. Further, the guide pipe 19 is not limited to a circular tube shape, but may be a rectangular tube shape or the like.

As described above, according to the present invention, it is possible to provide a heating furnace tube support structure that allows easy inspection of the U-bent portion and can stably support the heating tube.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional heating furnace tube support structure, and Figs. 2, 3, and 4 respectively show structures of first, second, and third embodiments of the heating furnace tube support structure according to the present invention. FIG. 11...Heating furnace tube, 11A...U vent part, 1
2...Packing plate, 14,24,34...Support pipe, 15...Flange plate, 16,26...
...Receiving plate, 18... Hearth iron plate, 19... Guide pipe, 21... Hearth caster.

Claims (1)

[Scope of utility model registration request] In a heating furnace tube support structure that supports a U-bent portion of a vertical heating tube in a heating furnace from below, a reinforcement plate is applied to the lower surface of the U-bent portion, and a reinforcement plate is attached to a predetermined amount. A support pipe of the same size is suspended and fixed, and this support pipe allows the U
A heating furnace tube support structure characterized in that a vent part is supported on the upper side of a hearth caster at a height position separated from the hearth caster by a predetermined distance.