JPH0441167Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a coil spacer used in a batch-type annealing furnace.

[Conventional technology]

Conventionally, a batch type annealing furnace 1 as shown in Fig. 4 was used.
0, in order to ensure uniformity of heat transfer and heating temperature of the stacked steel strip coils 11, a coil spacer 12 is arranged between each steel strip coil 11, and the circulating atmospheric gas is passed between the steel strip coils. The structure was such that it was in contact with the

As shown in FIG. 5, this coil spacer 12 has a pair of upper and lower discs 15 each having an inner hole 13 formed in the center and a ring-shaped ventilation hole 14 formed on the outside thereof. It was configured to be connected by a plurality of vertical plates 16 formed in a spiral shape.

[Problem that the invention attempts to solve]

However, the coil spacer 12 is the steel strip coil 1.
In the process of heating and annealing the steel sheet 1 and then cooling it, for example, the outer circumferential portion of the disk 15 is cooled faster than the central portion which is affected by the heat capacity of the steel strip coil 11, so the outer disk 15 contracts. As a result of this contraction, bending stress is generated in the vertical plate 16 disposed in the area of the ventilation hole 14, and as the vertical plate 16 is used repeatedly, it gradually bends, and in some cases cracks etc. may occur during use. There was a problem that it became impossible.

Therefore, in order to solve this problem, the vertical plate 1
6 could be considered to be thicker, but there was a problem that the thicker vertical plate 16 would increase the overall weight, reduce the air passage area, and increase the overall heat capacity, resulting in a decrease in thermal efficiency. .

The present invention was developed in view of the above circumstances, and an object of the present invention is to provide a coil spacer that is light in weight as a whole, is difficult to deform during use, and can improve thermal efficiency.

[Means to solve problems]

The coil spacer according to the present invention, which meets the above purpose, has an inner hole formed in the center, a ring-shaped ventilation hole formed on the outside, and a plurality of disks formed in a spiral shape. In the coil spacer connected by vertical plates, the thickness of the vertical plate disposed in the ring-shaped ventilation hole is thicker than other parts.

Here, the vertical plate installed in the ventilation hole may be thicker with the same thickness in the radial direction, or it may be extremely thick at the base inside the ventilation hole and gradually become thinner in the spiral direction. The present invention is also applicable to cases where the vertical plate is thicker than other parts.

In addition, the thickness of the vertical plate where the ventilation holes are arranged is about 1.2 to 3 times the thickness of the vertical plate in other parts, and if the ventilation holes and strength are also taken into consideration.
It is preferably about 1.5 to 2 times.

[Effect]

In the coil spacer according to the present invention, the spiral vertical plate disposed in the ventilation hole is thicker than other parts, that is, parts connected to the upper and lower discs. Therefore, even if the outer disk cools and contracts during use, and bending stress is generated in the vertical plate, the vertical plate is made thick, so if it does not receive bending stress greater than the yield stress of the material, the vertical plate will not bend. does not deform, and even if it is subjected to bending stress that exceeds the material's yield stress, the deformation will be minimal if the material is thick, so it is lighter and has a longer service life than conventional coil spacers. .

In addition, since the other parts of the vertical plate have disks connected above and below, they have a large section modulus and can withstand bending stress, so the vertical plate can resist the load received from above. It is fine as long as it is thick enough to withstand it.

And, since the vertical plate that connects the pair of discs is thinner than the vertical plate installed in the ventilation hole,
The area through which the wind passes increases and the wind resistance decreases as a whole.

〔Example〕

Next, an embodiment embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention.

Here, FIG. 1 is a partially cutaway plan view of a coil spacer according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A of the coil spacer according to the above embodiment, and FIG. 3 is a cross-sectional view of the coil spacer according to the embodiment of the present invention. It is a top view of the coil spacer based on another Example.

As shown in FIGS. 1 and 2, a coil spacer 17 according to an embodiment of the present invention is entirely made of ductile cast iron (or cast steel in some cases), and has an inner hole 18 formed in the center. upper and lower discs 20,
21, a vertical plate 22 connecting the discs 20 and 21,
23. These will be explained in detail below.

A ring-shaped ventilation hole 24 is formed in the approximately central portion of the disks 20 and 21 in the radial direction.
21 as outer ring plates 25, 26 and inner ring plates 27, 28, respectively.
It is separated into

The ventilation hole 24 is arranged concentrically with the central inner hole 18, and is formed at the center or slightly inside the center of the steel strip coil (not shown) to be placed, so that the hot air passing through the steel strip coil It is designed to hit the center and the inner side of the center.

The vertical plates 22 connecting the discs 20 and 21 are provided in a spiral shape at predetermined intervals from the center to the outer periphery, and the outer ring plates 25 and 26 are provided with short vertical plates 23, It is designed to have sufficient strength even under the weight of

The vertical plates 22 disposed in the ventilation holes 24 of the circular plates 20 and 21 are thicker than other parts, and the outer circular plates 20 and 21 are subjected to bending stress that tends to bend the vertical plates 22 and 23 during cooling. It has become possible to withstand

A protrusion 29 is formed at the inner circumferential end of the outer ring plate 25 to change the direction of the air entering from the outer circumference so that the hot air is applied to the steel strip coil in contact with the ventilation hole 24. The outer diameter of the coil spacer 17 according to the above embodiment is 1650 mm to 2500 mm, the diameter of the inner hole 18 is 450 mm to 600 mm, the height is 80 mm to 120 mm, and the thickness of the upper and lower discs 20 and 21 is 20 to 30 mm. In this case, the thickness of the vertical plate 22 at the portion fixed to the upper and lower discs 20, 21 was approximately 17 mm, and the thickness of the vertical plate 22 at the ventilation hole 24 portion was approximately 25 mm.

When using this coil spacer 17, hot air enters the interior from the circumference through the gaps between the vertical plates 22 and 23, and comes into contact with the upper and lower ends of each steel strip coil through the ventilation holes 24.

During the cooling process, the coil spacer 17 is gradually cooled from each part to the outer ring plates 25, 26.
shrinks, but the vertical plate 22 disposed in the ventilation hole 24
Since it is thicker, it can withstand bending stress even if it occurs.

Next, a coil spacer 30 according to another embodiment of the present invention shown in FIG. 3 will be explained, and the same components as those of the coil spacer 17 according to the above embodiment will be given the same numbers and their explanations will be repeated. Omitted.

The vertical plate 31 on which the ventilation hole 24 is arranged is thicker as a whole than the vertical plates 31 and 23 connecting the inner ring plates 27 and 28 and the outer ring plates 25 and 26. , 28 and gradually become thinner outward from the outer periphery.

By making the vertical plate 31 disposed in the ventilation hole 24 have an appropriate thickness, the coil spacer 30 has a resistance force corresponding to the bending stress generated in the vertical plate 31 during the cooling process. Since the section modulus can be increased, and the thickness is thinner toward the outside, the material used and the heat capacity as a whole can be reduced.

[Effect of idea]

Since the coil spacer according to the present invention is constructed as described above, the vertical plate is hard to deform even after repeated use, resulting in a long service life.Moreover, the overall weight can be reduced, so it can be manufactured at low cost.

Since the heat capacity also decreases as the weight decreases, the thermal efficiency of the annealing furnace as a whole improves.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of a coil spacer according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A of the coil spacer according to the above embodiment, and FIG. 3 is a plan view of a coil spacer according to another embodiment of the present invention. FIG. 4 is a plan view of a coil spacer according to an embodiment, FIG. 4 is a longitudinal sectional view of a conventional badge-type annealing furnace, and FIG. 5 is a plan view of a coil spacer according to a conventional example. Explanation of symbols, 17, 30...Coil spacer,
18... Inner hole, 20, 21... Inner plate, 22, 2
3, 31...vertical plate, 24...ventilation hole.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of spirally formed discs each having an inner hole in the center and a ring-shaped ventilation hole on the outside. A coil spacer connected by vertical plates, characterized in that the vertical plate disposed in the ring-shaped ventilation hole is thicker than other parts. (2) The vertical plate installed in the ventilation hole is gradually thinner in the radial direction.
Coil spacer described in section. (3) The coil spacer according to claim 1, wherein the thickness of the vertical plate disposed in the ventilation hole is 1.2 to 3 times the thickness of the vertical plate in other parts.