JPH0327607B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When performing optimal furnace temperature control in a continuous heating furnace or the like, the present invention measures and records in advance changes in the ambient temperature at a location corresponding to the bottom side of the material to be heated.
The present invention relates to a dummy slab for temperature measurement in a furnace, which uses this as one of the control factors for the temperature inside the furnace to perform efficient heat management.

As shown in FIG. 1, for example, the continuous heating furnace 1 is
Generally, the furnace is equipped with multi-stage zones such as a pre-heating zone A, a heating zone B, and a soaking zone C, and is controlled along a predetermined internal temperature pattern in the feeding direction of the material 2 to be heated, and the material 2 that is continuously fed is rolled. It is heated by each burner 3 so that it falls within the required target temperature range, and is supplied to the rolling line in accordance with the rolling pitch.
By the way, if the charging material conditions or rolling conditions change,
Since the material extraction temperature at the heating furnace outlet 4 changes, it is necessary to change the setting of the furnace temperature pattern. That is, the temperature inside the furnace must be set and controlled independently in each zone to form a temperature pattern inside the furnace for raising the temperature required from charging of the material 2 to extraction.

Moreover, the temperature inside the furnace in each zone needs to be controlled so as not to change due to various disturbances during steady operation, and it is important to heat efficiently in terms of heat management. For that purpose, continuous heating furnace 1
Detects temperature changes in all parts of the interior in advance,
It is important to know the characteristics of the furnace.

Therefore, conventionally, as shown in FIG. 1, thermocouples 5 have been disposed in various parts of the heating furnace to detect and control the temperature inside the furnace. Also, Figures 2 and 3
As shown in the figure, a thermocouple 8 is placed on the dummy slab 6 via a pedestal 7, and the atmospheric temperature change on the upper surface side of the dummy slab 6 in the furnace is continuously measured and recorded in advance. This record was used as a reference for controlling the operation of the furnace for thermal management.

However, the atmospheric temperature of the dummy slab 6 could only be obtained on its top surface, and could not be measured on its bottom surface. This is because the bottom height of the heating furnace inlet 9 and the height of the charging table 10 are set to be the same, and if a thermocouple similar to the thermocouple 8 is installed to protrude from the bottom side of the dummy slab 6, the charging When the dummy slab 6 is placed on the table 10 or when it enters the heating furnace 1, it collides with the bottom wall of the inlet 9 and is crushed or damaged. For this reason, in the past, the ambient temperature of the dummy slab 6 could only be measured on its upper surface.
It lacked reliability in terms of heat management. In addition, 11 in FIG. 1 is a skid pipe.

The present invention improves and eliminates the above-mentioned drawbacks of the conventional technology, and makes it possible to measure the atmospheric temperature on the bottom side of the dummy slab, making it possible to obtain very excellent thermal efficiency in terms of heat management. The purpose is to provide a dummy slab for temperature measurement inside the building.

The configuration of the present invention will be explained below based on the embodiments shown in the drawings.

First, as shown in FIGS. 4 and 5, an insertion hole 14 for the thermocouple 13 is drilled through the top and bottom surfaces of the dummy slab 12 at the measurement position, and a low A plug 15 made of a melting point substance or a substance that disappears by combustion is attached. Specifically, the stopper 15 is made of a metal with a low melting point, such as lead or zinc, or a combustion product such as wood or rubber. The thermocouple 13 is supported in a state in which the portion other than its thermal contact is housed in a hole sleeve 17 or a sheath tube to insulate the core wires from each other, and is inserted into a protective tube 16 made of metal, magnetic material, or the like. 18 is a stopper that also serves as a weight fixed to the outer periphery of the protective tube 16 of the thermocouple 13; 19 is the thermocouple 1;
This is the pedestal for number 3. The stopper 18 is located at a higher position than the upper surface of the dummy slab 12 when the thermocouple 13 is inserted into the insertion hole 14. The height of the stopper 18 from the top surface of the dummy slab 12 is the stopper 15.
When the thermocouple 13 disappears and the thermocouple 13 falls, it is necessary that the thermal contact portion protrudes from the lower surface of the dummy slab 12 by an amount (50 to 100 mm) suitable for temperature measurement. Furthermore, the length of the thermocouple 13 is such that even when the plug 15 is lost and the stopper 18 is hung on the upper surface of the dummy slab 12,
It is positioned higher up to provide stable support. 21 is a microcomputer (hereinafter referred to as microcomputer) housed in a protection device 22 installed on the dummy slab 12;
All output signals of the thermocouple 13 are recorded within this microcomputer 21. In addition, protective device 2
Reference numeral 2 is a double box body whose outer periphery is covered with a heat insulating material, and the outer box is filled with water, and the microcomputer 21 housed therein is cooled by the latent heat generated when the water evaporates.

In the case of the dummy slab 12 having the above configuration, when placed on the charging table 10 shown in FIG. 1 or at a position passing through the furnace inlet 9 in the heating furnace 1, a thermocouple 13 is inserted and supported with a plug 15 provided in the insertion hole 14, and the dummy slab 1
Thermocouple 13 between 2 and charging table 10 and at furnace inlet 9
There is no possibility that it will be crushed or damaged. Then, when the thermocouple 13 of the dummy slab 12 is sent into the furnace 1 and begins to advance, the plug 15 melts or burns and disappears near the bottom of the furnace at a temperature of 500 to 800°C, causing the thermocouple 1
3 falls to the position shown in FIG. As a result, the non-contact part (temperature sensing part) 13a of the thermocouple 13 protrudes from the bottom surface of the dummy slab 12, and measures the ambient temperature of the part. All measured data is sent to the protective device 22
The information is stored in the microcomputer 21 housed in the . This is measured and recorded over the entire area of the heating furnace 1.
For reference, the temperature of the microcomputer 21 when it leaves the furnace is within 50 to 100°C. Then, the thermocouple 13 is damaged after passing through the furnace outlet 4. however,
The temperature measurement results up to that point are stored in the microcomputer 21 on the dummy slab 12, and then taken out and analyzed. Since there is a sufficient gap between the upper surface of the dummy slab 12 and the ceiling surfaces of the furnace entrances and exits 4 and 9, there is no need to worry about damage to the microcomputer 21.

After that, taking into account the temperature change in the atmosphere under the dummy slab 12 stored in the microcomputer 21 and the furnace temperature pattern measured by the conventional method,
It is certain that excellent thermal efficiency can be obtained by managing the heat inside the heating furnace 1.

Note that the present invention is not limited to the above embodiments, and the shapes of the thermocouple 13, plug 15, pedestal 19, etc. can be changed as appropriate.

As explained above, in the present invention, a thermocouple insertion hole is drilled through a dummy slab, a plug made of a low melting point substance or a substance that disappears by combustion is provided at the bottom of the insertion hole, and the thermocouple is inserted. A stopper, which also serves as a weight, is fixed to the position of the thermocouple protruding from the upper surface of the dummy slab with its tip in contact with the stopper, and the pedestal for the thermocouple is provided on the dummy slab. In addition to measuring the temperature inside the furnace, it is possible to measure the atmospheric temperature pattern on the bottom side of the dummy slab to more accurately understand the temperature pattern inside the furnace, which can contribute to realizing optimal temperature control inside the furnace.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing a general continuous heating furnace.
2 and 3 are a cross-sectional side view and a cross-sectional rear view of a main part of a conventional thermocouple for measuring the ambient temperature on the upper surface side of a dummy slab, and FIGS. 4 and 5 are an embodiment of the present invention. FIG. 4 is a vertical cross-sectional view of the dummy slab showing the state before the plug disappears, and FIG. 5 is a vertical cross-sectional view of the dummy slab after the plug disappears. 12...Dummy slab, 13...Thermocouple, 14
...Insertion hole, 15...Plug, 18...Stopper,
19... cradle.

Claims (1)

[Claims] 1. A thermocouple insertion hole is drilled through the dummy slab, a plug made of a low-melting point substance or a substance that disappears by combustion is provided at the bottom of the insertion hole, and the thermocouple is inserted so that its tip touches the plug. For temperature measurement in a furnace, characterized in that a stopper serving as a weight is fixed to the position of the thermocouple protruding from the upper surface of the dummy slab while in contact with the thermocouple, and a pedestal for the thermocouple is provided on the dummy slab. dummy slab.