JPH0441168Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> When annealing a coiled steel plate, the invention is placed directly above a pedestal (also called base hardware) placed at the bottom of an annealing furnace, and the atmosphere gas is removed. This invention relates to a charge plate with a bottom spacer to promote a good flow path.

<Conventional technology> When batch annealing coiled steel sheets, a method has traditionally been adopted in which the coiled steel sheets are stacked in an inner cover inside the furnace body and atmospheric gas such as N ₂ gas is circulated around the coiled steel sheets. At this time, in order to efficiently transfer heat to the steel plate, a pedestal with a fan installed in the center is placed at the bottom.
Place a charge plate (also called hearth plate) on top of that, and then place a bottom spacer.
Layer the coiled steel plate 3 and the coil spacer on top of that in that order. By the way, the conventionally used charge plate is a disc-shaped body with an opening in the center, and the bottom spacer 7 is a disc-shaped body with a rib attached to the lower surface of the disc-shaped body, which also has an opening in the center. The charge plate and bottom spacer were separate pieces that were simply stacked on top of each other.

<Problems to be solved by the invention> The above-mentioned charge plate and bottom spacer, which are separate bodies, require time and effort to manufacture, resulting in high costs, and the disk-shaped body on the top surface of the bottom spacer Since the coiled steel plate 3 is a single plate with no openings other than an opening in the center, the lower part of the coiled steel plate 3 placed directly above the bottom spacer has poor heat transfer, so it is hard to heat. This was also a cause of unevenness.

The present invention aims to solve the above-mentioned problems and provide a charge plate/bottom spacer that is easy to manufacture and can be annealed well.

<Means for Solving the Problems> The means adopted by the present invention to achieve the above object is to provide ribs in a desired shape such as radial or spiral on the upper surface of the disc-shaped charge plate integrally with the charge plate. A disc-shaped bottom spacer is placed on the upper surface of the rib so as to be integral with the rib, and the bottom spacer is provided with a large number of gas flow holes passing through it vertically. This is a charge plate with a bottom spacer featuring the following.

The shape of the rib of the present invention may be any shape such as radial, spiral, or wavy as long as it allows atmospheric gas to flow easily, and the rib may be shaped like a coiled steel plate or a coil spacer placed on top. Since sufficient strength to withstand the weight is required, it is preferable to increase the number of fibers on the periphery side than on the center portion. In addition, the gas flow ports provided in the disc-shaped bottom spacer are used to allow high-temperature atmospheric gas to escape toward the upper coiled steel plate and raise the temperature of the steel plate more efficiently. For batch annealing,
A position slightly closer to the center between the outer periphery of the hollow part of a coiled steel plate having a hollow part in the center and the outer periphery of the coiled steel plate itself is called the so-called cold spot, and is the part where the temperature is least likely to rise. Therefore, the area and number of the individual openings shall be adjusted as appropriate so that the opening area of the gas flow opening at the position corresponding to the cold spot is larger than that at other locations.

[Effect]

In the present invention with the above configuration, the charge plate and the bottom spacer are integrated through the ribs, so they can be manufactured at the same time, and when used, only one piece needs to be placed on the pedestal. , there is no need to worry about subsequent positional deviation, and there is no need for time and effort during installation, making it easy to prepare for annealing. Also, during annealing, some of the high temperature atmospheric gas blown out from the outer periphery of the lower pedestal,
Heat flows inward from between the bottom spacer and the charge plate, and a portion of it passes through the gas flow opening in the bottom spacer and directly transfers heat to the coiled steel plate above.

<Examples> Examples of the present invention will be described in detail below with reference to the drawings.

The charge plate with bottom spacer shown in the drawing is an integral casting of ductile cast iron.
The top view is shown in Figure 2, the bottom view is shown in Figure 2, and the bottom view is shown in Figure 3.
The front view is shown in the figure. Further, FIG. 4 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 5 is a cross-sectional view taken along the line -- in FIG.

As shown in FIGS. 1 to 5, the charge plate with a bottom spacer of the present invention has a plurality of ribs 2, 2,... integrally arranged on the top surface of the charge plate 1, and the ribs are A bottom spacer 3 is integrally arranged on the top surface. And in the bottom spacer 3, penetrate it up and down,
A large number of gas flow ports 4, 4, . . . are opened in communication with the space between the charge plate 1 and the bottom spacer 3. The area of this gas flow port 4 is such that the area corresponding to the cold spot as described above is larger than the other areas.

As shown in FIG. 6, the charge plate with a bottom spacer of the present invention is placed on the inner bottom of the inner cover 6 in the furnace body 5, and is attached to a pedestal 8 in which a fan 7 is disposed in the center. It is used by placing it on the top surface, and a coiled steel plate 9 is placed directly above it.
, place the coil spacer 10 on top of it,
Furthermore, it is used by stacking the coiled steel plates in the order of the coiled spacer.

<Effects of the invention> As described above, according to the invention, the charge plate and the bottom spacer, which are absolutely necessary for batch-type coil annealing, are integrated through ribs, which simplifies the manufacturing process. Along with
It can be installed and moved all at once during use or repair. Furthermore, since conventional bottom spacers do not have open gas flow ports on the upper and lower surfaces, heating and cooling of the lower part of the coiled steel plate at the lowest stage is done only by heat transfer through the bottom spacer. However, in the present invention, the atmospheric gas passes through the gas flow port and comes into direct contact with the lower surface of the coiled steel plate, which has the effect of improving the thermal efficiency of heating and cooling.

[Brief explanation of the drawing]

Figure 1 is a plan view of the present invention, Figure 2 is a bottom view of the same,
Fig. 3 is a front view of the same, Fig. 4 is a sectional view taken along the line - Fig. 1, Fig. 5 is a sectional view taken along the line - Fig. 3, and Fig. 6 is an explanation showing how the present invention is used. figure. In the figure, 1...charge plate, 2...rib,
3...Bottom spacer, 4...Gas distribution port, 9
...Coil steel plate.

Claims (1)

[Scope of utility model registration request] A rib is formed in a desired shape such as radially or spirally on the upper surface of the disc-shaped charge plate integrally with the charge plate, and a disc-shaped bottom spacer is serially mounted on the upper surface of the rib so as to be integral with the rib. The charge plate with a bottom spacer is characterized in that the bottom spacer is provided with a large number of gas flow ports that pass through the bottom spacer vertically.