JPS5940135A - Dummy slab for measuring temperature in furnace - Google Patents

Abstract

PURPOSE:To measure an atmosphere temp. at a bottom surface side, by fixing a stopper serving also as a weight at the position of a thermocouple protruding from an upper surface of a dummy slab under the state in which the top end is in contact with a plug and providing a pedestal of the thermocouple on the dummy slab. CONSTITUTION:The thermocouple 13 is inserted and supported under the state in which the plug 15 is put at an inserting hole 14, and when it is supplied into a furnace and advancing is started, the plug 15 is melted or burnt down near 500-800 deg.C at the furnace bottom, and the thermocouple 13 falls until the position at which the stopper 18 fixed at a protective pipe 16 comes into contact with on the dummy slab 12. Thereby, the contact point part 13a of the thermocouple 13 is protruded from the bottom surface of the slab 12 to measure the atmosphere temp. of said point. All of measured data are stored in a microcomputer 21 containing in a protecting device 22, are measured and recorded over all regions of a heating furnace 1.

Description

[Detailed Description of the Invention] When performing optimal furnace temperature control in a continuous heating furnace, etc., the present invention measures and records changes in the atmospheric hot water temperature at a location corresponding to the bottom side of the material to be heated in advance. This relates to a full hot field dummy slab in a furnace, which is used as one of the control factors for the temperature inside the furnace to perform efficient thermal management.

As shown in FIG. 1, for example, a continuous heating furnace l is generally equipped with multiple zones such as a pre-heating zone A, a heating zone B, and a soaking zone C. The material 2 that is continuously fed is heated by each burner 3 so that it falls within the target temperature range required for rolling.
K is supplied to the rolling line in accordance with the rolling pitch.

By the way, if the charging material conditions or the rolling strip fl change, the material extraction temperature at the heating furnace outlet 4 changes, so it is necessary to change the setting of the furnace temperature pattern. That is, the furnace temperature must be set and controlled independently in each zone, and the furnace temperature pattern required for the temperature rise required from charging to extraction of the material 2 must be shaped.

Moreover, the temperature inside the furnace in each zone must be controlled so that it does not change due to various disturbances during steady operation.
Furthermore, in terms of heat management, it is important to heat efficiently. To this end, it is important to detect temperature changes in every part of a continuous heating furnace in advance and to know the characteristics of the furnace.

Therefore, conventionally, as shown in FIG. 1, thermocouples 5 were placed in various parts of the heating furnace to detect and control the vorticity in the furnace. In addition, as shown in FIG. Changes in the ambient temperature were continuously measured and recorded to perform thermal management as a means of controlling the operation of the furnace.

However, 1. Atmosphere of dummy slab 6, tl'
J Humidity is on the top side? There is no measurement of the side of the horse! There was no 1. This is because the force 11 is set to the height of the bottom of the furnace inlet 9 and the force i 1til of the charging table 10, and a thermocouple similar to the thermocouple 8 is made to protrude from the bottom side of the slab 6. When installed, when the dummy slab 6 is placed on the charging table 10, or when the dummy slab 6 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 tummy slab 6 did not reach 75-8111 feet on the upper surface side14), resulting in a lack of reliability in terms of thermal management. In addition, number 11 in Figure 1 is Skid no Ku Eve.

It is also possible to measure the atmospheric temperature on the bottom side of the dummy slab, and it is placed on the heat tube 1111 in the furnace where very good thermal efficiency can be obtained: i? ii) We aim to provide a dummy slab for temperature measurement.

The following is a description of the structure of the present invention based on an embodiment shown in the diagram below.

First, as shown in Figures 4 and 5, one dummy slab 12
At the measurement position, insert a shell through the top and bottom surfaces (insertion hole 14 for the thermocouple 13 is made, and a plug 15 made of a low melting point substance or a substance that disappears by combustion is attached to the bottom side of the insertion hole 14. 15Vi Specifically, all poles with a low melting point, such as lead, zinc, wood, rubber, etc., are used.The thermocouple 13 is placed in a hole sleeve 17 or a sheath tube with the parts other than the hot junction. The core wires are insulated from each other and supported while being inserted into a storage tube 16 made of gold rice, magnetic material, etc. 18
19 is a stopper which is fixed to the outer periphery of the storage tube 16 of the thermocouple 13 and also serves as a nine-fold weight; The stopper 18Fi and the thermocouple 13 are located at a higher position than 1 m above the dummy slab 12 with the thermocouple 13 inserted into the insertion hole 14. When the height t of the stopper 18 from the top surface of the dummy slab 12 disappears and the thermocouple 13 falls, the I/A contact point should be adjusted to an amount suitable for the side vortex (50 to 100 mm).
It is also advantageous that the dummy slab 12 is made to protrude from the lower surface of the dummy slab 12. In addition, the length of the thermocouple 13 is such that the plug 15 is lost and the stopper 18 hangs on the top surface of the dummy slab 12.
Even in the state where the 1iiJ recording holder 19 is placed above the fitting hole 20, a stable support state can be obtained. 21 is a microcomputer housed in a storage device 22 which is placed on the dummy slab 12 (
Hereinafter referred to as a microcomputer, all the output signals of the thermocouple 13 are recorded in the microcomputer 21.The warranty device N22 is a double box whose outer periphery is covered with a heat insulating material. Water is poured into the outer box, and the heat generated when the water evaporates cools the microcomputer 21 housed therein.

The dummy slab 12 having the above configuration is placed on the charging table 10 shown in FIG. 1 or at the furnace inlet 9 in the heating furnace l.
(As shown in Fig. 64, the thermocouple 13 is inserted and supported with a plug 15 provided in the insertion hole 14, and the thermocouple 13 is inserted and supported between the tammy slab 12 and the charging table 10 and the furnace inlet 9. Then, when the thermocouple 13 of the dummy slab 12 is sent into the furnace 1 and begins to advance, the temperature of 500 to 8 at the bottom of the furnace increases.
At around 00°C, the stopper 15 melts or burns and disappears, and the thermocouple 13 reaches the position shown in FIG. Pi
The stopper 18 fixed at 6 is the dummy slab is/J
It falls at the position O where it touches Y. This allows thermocouple 1
The third non-contact part (temperature sensing part) 13a is the dummy slab 12
protrudes from the bottom surface of the device, and measures the ambient temperature at that part. All measured data is stored in the microcomputer 21 housed in the storage device 22. This is 611'' 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℃. It is destroyed after passing through exit 4. However, the previous 61 results are stored in the microcomputer 21 on the dummy slab 12, and are then taken out and subjected to phase separation processing. There is a sufficient gap between the top surface of the dummy slab 12 and the ceiling surface of the furnace entrance/exit 4.9.
There is no need to worry about the 1i-43 table of the microcomputer 21.

After that, the dummy slab 1 stored in the microcomputer 21
2. Humidity changes in the bottom atmosphere and temperature inside the furnace measured using the conventional method! If you take into account the ff pattern and manage the heat inside the heating furnace 1, you will get excellent thermal efficiency. This is limited to the example and does not include the thermocouple 13, the plug 15, or the moon shape of the pedestal 19.
411-1 Can be changed as appropriate 0 As explained above, it is uninvented that thermocouple insertion holes are commonly drilled in the tammy slab, and from the knowledge that 15% of the low melting point substance is burnt out in a part of the insertion hole. When the thermocouple is fully inserted and the thermocouple is in contact with the memory, a stone that also serves as a weight is placed on the elevation of the thermocouple that protrudes from the top surface of the dummy slab. Since a pair of pedestals are installed on the dummy slab, in addition to the conventional temperature measurement 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. It is possible to contribute to the realization of hot water temperature control in the furnace.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing a general continuous heating furnace, Figs. 2 and 3 are cross-sectional side views of a pair of heat t for measuring the atmospheric temperature on the upper surface side of a dummy slab in the past, and Figs. The cross-sectional rear view of the dummy slab, FIGS. 4 and 5 show an instant implementation of the present invention, and FIGS. FIG. 5 is a longitudinal sectional view of the dummy slab after the stopper has disappeared. 12...Dummy slab 13...Thermocouple 14...
・Insertion hole 15...Plug 18...Stopper 19・
...Case Patent Applicant Sumitomo Metal Industries Co., Ltd. Agent Patent Attorney Toshihiko Uchida Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] 1. A thermocouple insertion hole is drilled through the dummy slab, a frame 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 fully inserted so that its tip is aligned with the plug. A stopper serving as a weight 4 is fixed to the position of the thermocouple protruding from the upper surface of the dummy slab while in contact with the dummy slab, and a pedestal for the thermocouple is provided on the dummy slab. Warming dummy slab.