JPH0222124B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steel billet and slab extraction door for a continuous heating furnace that continuously extracts steel billets and slabs from inside the heating furnaces by a drive roller.

Conventionally, extraction doors of the type shown in FIGS. 1 to 5 have been used as extraction doors for steel slabs and cast slabs in this type of heating furnace. That is, in FIGS. 1 and 3, 1A
2 is a heating furnace; 3 is a driving roller disposed in front of the heating furnace extraction port 4;
5 is an extraction door provided to open and close the heating furnace extraction port 4. The state shown in FIG. 1 is a state in which steel slabs and slabs 1A are continuously extracted from the heating furnace 2 by the drive roller 3 during double-row extraction, and at this time the extraction door 5 is heated. A driving device 9 fixedly installed on the furnace 2 raises and holds the steel slab to a height that does not interfere with the slabs and slabs 1A, 1A. At this time,
Heating furnace extraction port 4, extraction door 5, steel slab and cast slab 1A
The gap between them becomes extremely large. The gap is the difference between the cross-sectional area of the heating furnace extraction port 4 and the cross-sectional area of the steel billet and cast slab 1A, as shown in FIG.

In FIG. 3, 1B indicates steel slabs and cast slabs during single-row extraction, and the drive roller 3
The difference between the cross-sectional area of the heating furnace extraction port 4 and the cross-sectional area of the steel slabs and slabs 1B increases as shown in FIG. 4. Fifth
The figure shows the steel billet and slab 1C tilted by 45 degrees from the steel billet and slab 1B.
The extraction door 5 is raised and held by the heating furnace extraction port 4 and the steel billet and slab 1C.
The difference with the cross-sectional area still increases.

In this way, the opening of the heating furnace extraction port 4 is much larger than necessary compared to the cross-sectional area of the steel slabs and slabs that are actually extracted. Therefore, the excessive opening of the heating furnace extraction port causes a large loss of thermal energy within the furnace, which is economically disadvantageous.

Compared to the conventional method, the present invention does not leave the extraction door open when extracting steel slabs and slabs in single or double rows, but also allows for combined installation and combined operation of the extraction door and auxiliary door in accordance with the extraction method. The purpose is to minimize the gap between the extraction door opening and the steel slabs and slabs, and to minimize the intrusion of cold air into the heating furnace and heat dissipation, thereby achieving energy saving effects for the furnace. That is.

An embodiment of the present invention will be described below with reference to FIGS. 6 to 11.

In FIG. 6, 1A indicates steel slabs and slabs during double-row extraction, and they are continuously extracted from heating furnace 2 through heating furnace extraction port 4 by drive roller 3. is the same as the conventional one, but
As shown in FIG. 6, this extraction door 5 has a bottom part that enables continuous extraction of steel slabs and slabs 1A during double-row extraction, and appropriately minimizes the amount of steel slabs and slabs 1A.
Notches 6A and 6B are provided to ensure a gap between the two. This extraction door 5 is raised and held by a drive device 9 fixedly installed on the heating furnace 2 so as not to interfere with the steel slabs and slabs 1A.

At this time, the difference between the cross-sectional area of the extraction door notches 6A and 6B and the cross-sectional area of the steel slab and cast slab 1A is small, as shown in FIG.

Further, as shown in FIGS. 6 and 8, this extraction door 5 is provided with a single row of extraction openings 7 above the notch 6A. This single-row extraction opening 7 has a length that will not interfere with the extraction door 5 even if the steel billet or slab 1B is tilted by the steel billet or slab 1C tilted at 45 degrees as shown by the dotted line in FIG. It has a size of .

Furthermore, this extraction door 5 has upper and lower opposing auxiliary door guides 12A, 12 fixedly installed on the front surface of the extraction door 5.
Auxiliary doors 8A and 8B guided and held by B are provided on the front left and right sides of the single-row extraction opening 7, and are assisted by joints 13A and 13B and cylinder mounting bases 11A and 11B fixed to the extraction door 5. The cylinders 10A and 10B connected to the doors 8A and 8B are configured to open and close freely so that the steel slabs and slab 1B do not interfere with each other.

In Fig. 8, 1B is the steel slab and cast slab during single-row extraction, from the inside of the heating furnace 2 to the heating furnace extraction port 4.
This shows a state in which the steel slabs and cast slabs 1B are continuously extracted by the drive roller 3 through the extraction door 5.
It is raised and held by a drive device 9 so that it can be extracted without interference. Therefore, during single-row extraction, the heating furnace extraction port 4, except for the single-row extraction opening 7, is closed by the extraction door 5, and the auxiliary doors 8A, 8B are opened by the operation of the air cylinders 10A, 10B. , cross-sectional area of single-row extraction opening 7, steel slab and cast slab 1
The difference with the cross-sectional area of B gradually decreases, and becomes as shown in FIG.

1C in FIG. 10 shows a state in which the steel slabs and slabs 1B during single-row extraction are tilted by 45 degrees and are continuously extracted from the inside of the heating furnace 2 by the drive roller 3.

Auxiliary doors 8A, 8 after completion of 45 degree tilting of steel slabs and cast slabs
B is moved to a closed state as shown in FIGS. 10 and 11 by the operation of air cylinders 10A and 10B. At this time, the difference between the cross-sectional area of the single-row extraction opening 7, the shielding cross-sectional area of the auxiliary doors 8A and 8B, and the cross-sectional area of the steel billet and cast slab 1C is still reduced compared to the conventional method (see Figure 5). However, there are far fewer openings in the furnace, as shown in Fig. 11.

When the extraction of the steel slab and slab 1C tilted at 45 degrees is completed, the auxiliary doors 8A and 8B are moved back to the cylinder 10.
A and 10B are opened, resulting in the state shown in FIG.

As explained above, the conventional method (Figs. 1 to 5)
According to Fig.), an excessive gap is forced to exist in the heating furnace extraction port 4 due to the difference in the number of extraction rows and extraction posture of the steel slabs and slabs 1A, 1B, and 1C. According to the present invention, even when there are differences in the number of extraction rows and extraction postures of steel slabs and slabs, it is possible to obtain an appropriate gap for extraction as small as possible according to the extraction form, and to minimize the opening in an appropriate manner. By ensuring a gap, it is possible to minimize the intrusion of cold air into the heating furnace and heat dissipation, thereby minimizing the energy loss of the heating furnace and significantly increasing the energy saving effect and economic efficiency of the furnace. It has characteristics such as being able to

[Brief explanation of drawings]

Figures 1 to 5 show examples of conventional heating furnace extraction doors. Figure 1 is a front view and longitudinal side view showing the double-row extraction of steel slabs and slabs, and Figure 2 is a side view of the same. Detailed view of the main parts, Figure 3 is a front view and vertical side view showing the state of the extraction door when extracting steel slabs and slabs in a single row and when tilting the slabs and slabs at 45 degrees, Figure 4, Figure 5 is a detailed view of the main parts, and Figures 6 to 11 show an embodiment of the automatic extraction door for steel billets and slabs in a continuous heating furnace according to the present invention. A front view and a vertical side view of the embodiment of the extraction door of the present invention during double-row extraction, FIG. 7 is a detailed view of the main part, and FIG. A front view and a vertical side view showing the state of use, Fig. 9 is a detailed view of the main parts, and Fig. 10 is a front view showing the state of use of the auxiliary door and extraction door when the steel billet and slab are tilted at 45 degrees. The vertical side view and FIG. 11 are detailed views of the main parts. 1A...Steel slabs and slabs during double-row extraction, 1B...
Steel slabs and slabs during single-row extraction, 1C...Steel slabs and slabs tilted by 45 degrees, 2...Heating furnace, 4...Heating furnace extraction port, 5...Extraction door, 6A, 6B... ...notch,
7... Single row extraction opening, 8A, 8B... Auxiliary door,
10A, 10B...Cylinder, 11A, 11B...
...Cylinder mounting base, 12A, 12B...Auxiliary door guide.

Claims (1)

[Claims] 1. In the extraction door for steel slabs and cast slabs of a continuous heating furnace,
In order to minimize the excessive difference between the cross-sectional area of the heating furnace extraction port and the cross-sectional area of billets and slabs, the extraction door is equipped with an appropriate minimum number of slabs and slabs to enable double-row extraction of billets and slabs. Multiple notches with a difference in cross-sectional area from one side, and appropriate and minimum steel slab and slab sections that can extract steel slabs and slabs tilted at 45 degrees during and after single-row extraction. An automatic extraction door for steel billets and cast slabs for a continuous heating furnace, characterized in that it is provided with a single row of extraction openings with a difference in area and an auxiliary door that can be moved to open and close the openings. 2. The automatic extraction door for steel billets and cast slabs for a continuous heating furnace according to claim 1, characterized in that the auxiliary door is divided into left and right halves, each of which can be automatically opened and closed by an air cylinder device.