JPS595729Y2 - Balken double walking beam continuous furnace - Google Patents

Description

[Detailed description of the invention] This invention relates to a double walking beam continuous furnace Balken.

If a water-cooled beam is used to transport the heated object in a double walking beam continuous furnace that heats the heated object vertically at a high temperature of 1000°C or higher, the beam is less likely to be damaged by heat, but on the other hand, the heated object There was a problem in that the difference between the temperature and the surface temperature of the beam was significant, and skit marks were generated on the beam contact surface of the object to be heated.

It is thought that this problem can be theoretically solved by using a non-water-cooled beam using Balken.

However, as shown in Figure 7, in the conventional Balken, the refractory bricks 2 are placed in a concave metal piece 1 so that the head 2' of the brick 2 protrudes. There was a problem in that even if they were made of heat-resistant steel, they would not be able to avoid being damaged by the heat and would not be able to withstand long-term use.

In addition, in a double walking beam type continuous furnace using a bulken, if the temperature throughout the furnace is over 1001)'C, not only the bulken but also the area around the bulken support will be damaged by heat. The temperature is adjusted to keep the lower part of the furnace below 1000°C.

However, in the case of the conventional bulken, due to the above-mentioned structure, the gap 3 between the bulkens is large (approximately 100 m/m or more), so the heat due to radiation escapes to the bottom through this gap, and the heat from the radiation that is placed on the bulge 1 of the object to be heated 4 escapes to the bottom through this gap. Part 4' and gap part 4''
This caused a temperature difference, and the object to be heated could not be heated evenly.

In order to solve these problems, the first step is to improve the material of the bulken so that it can withstand high temperatures of over 1000℃, and the second is to narrow the beam gap and use the conventional size bulken. However, it is possible to reduce the gap by making the width of the bulken larger than the conventional size without narrowing the beam spacing.

However, the first point above causes an extreme cost increase, and the step before the second point not only requires modification of existing equipment, but also involves the installation space for the beam drive mechanism, sealing device, etc. This is difficult to implement in practice.

Further, regarding the latter part of the second point, in order to increase the size of the bulken, the wall thickness of the bulken hardware must be made thicker, otherwise it would not be able to withstand high heat, resulting in an extreme increase in weight, which was not desirable.

This idea allows the bulkens to be made of a conventional material without being damaged by high temperatures, and also makes the width of the bulkkens larger than the conventional size without narrowing the conventional beam spacing, thereby reducing the gap between the beams. The aim is to provide a new bulken that can be solved without increasing the weight of the bulken.

This purpose can be achieved by combining a recessed metal piece and a protective refractory having the same shape, same size, or slightly larger planar shape as the concave metal piece.

In other words, the edge of the surrounding wall of the concave metal piece is covered by the oval refractory and is not directly exposed to high temperatures, and the height of the circumferential wall of the concave metal piece is reduced from the conventional size by the equivalent thickness of the brim of the large oval piece. Therefore, even if the gap between the bulkheads is made smaller by making the width of the concave metal fittings and guard guard large size larger than the conventional size, there is no need to thicken the wall thickness of the bulkhead fittings, and the overall weight is the same as that of the conventional bulkken. This is because the width is significantly reduced compared to the case where the width is simply increased.

Hereinafter, one embodiment of this invention will be described based on the drawings from FIG. 2 onwards.

Reference numeral 10 denotes a concave metal fitting made of heat-resistant steel that is approximately parallelogram-shaped in plane, and has bulges 11.11 parallel to the front and rear edges on its front and rear lower surfaces.
' is provided.

This bulging portion 11.11' is connected to a drive device (
12. 12' upper surface recess 13
, 13'.

Reference numeral 14 denotes a band-shaped protruding portion where the bulging portion 11 contacts the upright frame of the upper surface recess 13 of the support 12.

Note that the bottom surface 10' of the concave hardware 10 shown in this figure is raised with a gentle curvature at the center.

Although it is desirable to do this in terms of the strength of the hardware, it is needless to say that it is not limited to this.

Reference numeral 15 denotes a peripheral wall of the concave hardware 100, the upper edge of which is beaded to prevent cracking due to thermal stress.

Reference numeral 16 denotes a protective refractory having the same shape and size (sometimes slightly larger) as the concave metal fitting 10;
a and a hanging portion 16b.

Therefore, when the hanging portion 16b of the guard-proof large object 16 is fitted into the concave metal object 10, the flange portion 16a covers the upper edge of the periphery of the concave metal object 10.

Reference numeral 17 denotes mortar or something similar filled in the inner bottom of the concave metal fitting 10, and is used to form a spacer when the V-shaped refractory 16 is combined with the concave metal fitting 10.

Reference numeral 18 denotes a cushion mortar interposed between the peripheral wall 15 of the concave metal fitting 10 and the hanging portion 16b/outer circumference of the oval refractory 16, which absorbs thermal expansion deformation caused by the concave metal fitting 10 and guard refractory 16 due to high temperatures. I'm trying to make it possible.

Reference numeral 19 denotes a ceramic fiber encapsulating the upper edge of the peripheral wall 15 of the concave metal fitting 10, which blocks heat from the side surface of the concave metal fitting 10, and works together with the flange 16a of the guard refractory 16 to protect the concave metal fitting 10. This is to further reduce damage caused by heat.

As described above, the Balken of this invention has a concave hardware 10 having a substantially parallelogram shape in plane with bulges on the front and rear lower surfaces, and a planar shape that is the same shape and size as the concave hardware 10 (sometimes slightly larger). Since the upper edge of the peripheral wall 15 of the recessed hardware 10 is formed by combining the guard refractories 16 with the guard refractories 16, the upper edge of the peripheral wall 15 of the guard refractories 16 is
Since the concave hardware 10 is not directly exposed to high temperatures, damage caused by heat is not only greatly reduced compared to conventional products, even though the same material is used as the conventional products. The height of the peripheral wall 15 of the concave metal fitting 10 is equal to the height of the flange 16 of the universal refractory 16.
The size can be reduced by an amount equivalent to the wall thickness of a, and even if only the width of the concave hardware and guard guard figure is made larger than the conventional bulken size, the overall weight does not increase.

Therefore, the bulken size can be increased without narrowing the beam interval, thereby making it possible to make the gap 20 between the bulkens small (30 m/m or less).

As described above, this invention enables long-term use in a double walking beam type continuous furnace that heats objects at a high temperature of 1000°C or more while being made of the same materials as conventional ones, and also allows the lower part of the furnace to be used for a long time. Even when the temperature is kept at 1000°C or less, radiation heat rarely escapes to the lower part through the gap between the bulkheads, and there is no temperature difference between the part 21' of the object to be heated 21 resting on the bulken and the gap part 21'', which saves energy. In addition to being advantageous in this respect, it also produces various excellent effects such as less skit mercury and improved product quality.

In addition, in carrying out this invention, a cushion mortar 18 is interposed between the peripheral wall 15 of the concave metal fitting 10 and the outer periphery of the hanging part 16b of the guard refractory 16, and ceramic fibers are placed on the upper edge of the circumferential edge of the concave metal fitting 10. Encapsulation is effective for more efficiently exhibiting the above effects.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view showing a conventional example, Fig. 2 to Fig. 7 show an embodiment of this invention, Fig. 2 is a partially cutaway perspective view thereof, Fig. 3 is a cross-sectional front view, and Fig. 4 is a cross-sectional side view showing a conventional example. FIG. 5 is a partially enlarged view, FIG. 5 is a sectional side view, FIG. 6 is a diagram showing the relationship with supports 1 in the furnace, and FIG. 7 is a plan view showing the arrangement state in the furnace. 10... Concave hardware, 11.11'...
Swelling part, 15... Peripheral wall, 16... Protective refractory, 16 a... Flam part, 16b...
・Drooping part, 18...Cushion mortar, 19
・・・・・・Ceramic fiber

Claims (2)

[Scope of utility model registration request] (1) A double walking beam made by combining a concave metal piece with a planar shape of a substantially parallelogram having bulges on the front and rear lower surfaces, and a guard refractory having a planar shape of the same size or slightly larger than the concave metal piece. Valken type continuous furnace. (2) Utility model registration claim No. 1 in which a cushion mortar is interposed between the peripheral wall of the concave metal piece and the outer periphery of the drooping part of the guard refractory, and ceramic fiber is encapsulated on the edge of the peripheral wall of the concave metal piece. Balken as described in section.