JPS595728Y2 - billet support beam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a billet support beam in a walking beam type heating furnace for steelmaking, and more particularly to an improvement of a support pipe constituting the beam.

FIG. 1 shows a cross section of a general walking beam type heating furnace, where 1 is the furnace body, 2 is a steel billet to be heated, and 3 and 4 are for feeding the billet 2 from a charging port (not shown) to an extraction port. A support beam 3 is a fixed beam fixed to the furnace body 1;
4 is a moving beam driven by a drive device (not shown) installed in the furnace body.

In such a walking type heating furnace, the steel billet 2 is heated by radiant heat from the high-temperature gas in the furnace, but due to the presence of the beam 3.4, the radiant heat is not sufficiently transmitted to the lower side of the steel billet 2. In addition, since cooling water is flowing inside the beams 3 and 4, the surface of the beams 3 and 4 is at a low temperature compared to the high temperature inside the furnace. Therefore, even if the steel slab 2 is heated to a high temperature, the temperature of the steel slab 2 near the beams 3 and 4 decreases due to radiant heat between the steel slab 2 and the beams 3 and 4.

This low-temperature area that occurs in the steel piece 2 is generally referred to as a shadow mark X, and has been a hindrance to effective energy use and product quality improvement.

In particular, when the steel piece 2 is a relatively short material such as a slab material, the distance Y between the beams 3 and 4 becomes very narrow, so that the shadow mark X is conspicuous.

The present invention was developed in view of the above-mentioned circumstances, and provides a steel billet heating furnace in which a reflective plate for billet heating is disposed on the side of a horizontal support pipe constituting a billet support beam in a walking beam heating furnace. This relates to a single support beam.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 2 shows an embodiment of the present invention.
It is an enlarged view of a portion corresponding to part I, and the same parts as in FIG. 1 are indicated by the same reference numerals.

Reference numeral 5 indicates a support pipe which is a main member for controlling each of the beams 3 and 4 and allows cooling water to flow therein; 6 indicates a skid rail attached to the top surface of each of the support pipes 5 to support the steel piece 2; and 7 is a refractory material provided around the outer periphery of the support pipe 5 to protect the support pipe 5 from the high temperature inside the furnace.

On one side of the support pipe 5 in the beam 3, a vertically extending reflection plate 8 with a curved upper end corresponding to the outer shape of the support pipe 5 is disposed, and the reflection plate 8 is curved at the upper end of the support pipe 5. Install the mounting member 9 as appropriate so that the part does not protrude above the top surface of the skid rail 6.
The reflecting plate 8 is attached to the support pipe 5 through a horizontal line so as to maintain a required gap between the reflecting plate 8 and the support pipe 5.

Further, a reflecting plate 8 is similarly attached to the support pipe 5 in the beam 4.

Since the structure is as described above, each support pipe 5 in the beams 3 and 4 collects the radiant heat inside the furnace over a relatively wide area, and this heat is transferred to the upper part of the reflecting plate 8, that is, the radiant heat inside the furnace. Guide it to the vicinity of support pipe 5, which is difficult to hit,
Moreover, this heat can be used as radiant heat to heat the steel piece 2.

Furthermore, since a required gap is formed between the support pipe 5 and the reflection plate 8, the cold air generated by the cooling water in the pipe 5 is prevented from being directly transmitted to the reflection plate 8, thereby promoting the above-mentioned radiation effect. ing.

Further, the radiant heat from the steel piece 2 to the support pipe 5 is reflected by the reflection plate 8 and returns to the steel piece 2 again, thereby preventing heat loss.

In this way, the reflection plate 8 can transmit the radiant heat in the furnace to the steel billet 2, and also reflect the radiant heat of the steel billet 2 to the steel billet 2, so that a shadow mark is created near the support pipe 5 of the steel billet 2. It is possible to prevent the occurrence of a low-temperature zone called .

Incidentally, in the embodiment described above, the case where the reflection plate 8 is disposed on one side of each beam 3, 4 has been illustrated, but the location where the reflection plate 8 is disposed can be arbitrarily selected as required.

That is, they may be placed on both sides of the beams 3 and 4, they may be placed continuously in the furnace length direction, they may be placed only in high temperature areas such as the heating zone or soaking zone, or they may be placed on the fixed beam 3. Depending on the positional relationship of the moving beams 4, it is possible to alternately and intermittently arrange the moving beams 3 and 4, or to use various arrangement methods.

Further, to explain another embodiment of the present invention, a heat insulating material 10 is attached to a predetermined position inside the reflection plate 8, that is, on the surface facing the support pipe 5, as shown by the imaginary line in FIG.

By doing so, heat transfer from the steel piece 2 to the support pipe 5 can be further reduced.

Note that the reflection plate in the above embodiments may be a flat plate, a corrugated plate, or
Furthermore, various shapes and materials such as coils and wire meshes can be employed, and it goes without saying that various other changes can be made without departing from the gist of the present invention.

As shown above, the steel billet support beam of the present invention provided with a reflective plate has the following advantages: (i) The radiant heat in the furnace is collected over a wide area and transmitted to the steel billet, so thermal energy can be used effectively.

(ii) Since the radiant heat in the furnace is transmitted to the steel pieces near the support beam, where the radiant heat in the furnace is difficult to reach, it is possible to prevent low-temperature areas, that is, shadow marks, from occurring on the steel pieces.

(iii) Since the radiant heat emitted from the steel piece is reflected and returned to the steel piece, it is more effective in effectively utilizing thermal energy and preventing shadow marks.

Demonstrates excellent effects such as

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a walking beam type heating furnace using a conventional support beam, and FIG. 2 is an enlarged view showing the support beam of the present invention and corresponds to section II in FIG. 2...Steel piece, 3...Fixed beam, 4.
...Moving beam, 5...Support pipe, 8...Reflection plate.

Claims (1)

[Scope of utility model registration request] A steel billet support beam for a walking type heating furnace, characterized in that a reflecting plate for heating the billet is provided on the side of a horizontal support pipe that constitutes the billet support beam.