JPH05317946A - Measuring device for surface temperature of strip - Google Patents

Abstract

PURPOSE:To measure the surface temperature of a strip continuously with high accuracy without receiving the influence of cooling water. CONSTITUTION:This device consists of coolers 6A-6C for the lower surface of the strip provided between table rollers, table roller coolers 7A-7C provided in adjacent to them, thermometers 8A-8C which are provided near these coolers to measure the temperature of the strip 2 in noncontact state and a controller 11 to send on/off signals successively to each of these collers, to fetch output signals from the thermometers 8A-8C while these coolers are off and to display them on the indicator 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip surface temperature measuring device, and more particularly to a strip surface temperature measuring device capable of continuously and highly accurately measuring the strip surface temperature without being affected by cooling water. It is about.

[0002]

2. Description of the Related Art A strip rolled by a hot finishing mill is cooled and then wound by a winder. The surface temperature of the strip during cooling is extremely important and needs to be strictly controlled. is there.

Conventionally, in order to measure the surface temperature of the strip during cooling, a non-contact type thermometer such as a radiation thermometer is installed at a position apart from the cooler on the table roller on the delivery side of the hot finish rolling mill. By doing.

However, in the above-mentioned method, when a thermometer is installed near the cooler, a measurement error occurs due to steam, water droplets, dust, etc. generated by cooling the strip. It has a problem that it is limited to just before the winder.

Therefore, for example, Japanese Patent Publication No. 60-38201 and Japanese Patent Publication No. 60-192231 disclose a method of removing vapor, water droplets, dust, etc. floating in the temperature detection field of view of a non-contact type thermometer by compressed gas. Is disclosed. Hereinafter, this method is referred to as Prior Art 1.

As another method, there is a method of controlling the cooler to temporarily stop the injection of cooling water at the thermometer installation portion at the time of temperature measurement. Hereinafter, this method is referred to as Prior Art 2.

[0007]

However, the above-mentioned prior art 1 has the following problems. That is,
Since there is a limit to the ability of the compressed gas to remove steam, water droplets, dust, etc., it cannot be applied to a place where a large amount of cooling water is jetted onto the strip surface.

On the other hand, the above-mentioned prior art 2 has the following problems. That is, when the temperature of the upper surface of the strip is measured, since the residence time of the cooling water on the upper surface of the strip is long, it is necessary to take a wide range of stopping the cooling water. Therefore, the cooling capacity of the strip is reduced accordingly. Further, when cooling the lower surface of the strip, not only the strip cooling water but also the cooling water of the table roller needs to be stopped. Therefore, if the cooling water is continuously stopped, the table roller may be burned. There is If the cooling water is stopped intermittently in order to prevent the seizure of the table roller, the surface temperature of the strip cannot be continuously measured.

Therefore, an object of the present invention is to provide a strip surface temperature measuring device capable of continuously and highly accurately measuring the strip surface temperature without being affected by cooling water.

[0010]

SUMMARY OF THE INVENTION The present invention is for continuously measuring the temperature of a strip which is continuously rolled in the direction of the winder on a table roller after being rolled by a hot continuous rolling mill. The strip lower surface cooler provided between the table rollers, the table roller cooler provided near the strip lower surface cooler, the strip lower surface cooler and the table roller cooler. A thermometer provided in close proximity for measuring the temperature of the strip in a non-contact manner, an on / off signal is sequentially sent to the strip lower surface cooler and the table roller cooler, and the strip lower surface cooler and the strip lower surface cooler are provided. Control for sequentially fetching output signals from the thermometer and displaying them on the display while the table roller cooler is off Those having features to be composed of a.

Next, one embodiment of the strip surface temperature measuring device of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the surface temperature measuring apparatus for a strip according to the present invention. In the drawings, 1 is a hot finish rolling mill, 2 is a strip,
3A to 3H are table rollers, 4 is an upper surface cooler of the strip 2, 5 is a winder of the strip 2, and 6A to 6C are
Between the table rollers 3B and 3C, between 3D and 3E, between the strip lower surface cooler provided between 3F and 3G, 7A to 7C, the table roller cooler provided near the strip lower surface coolers 6A to 6C, 8A to 8C are strip bottom coolers 6A
To 6C and table roller coolers 7A to 7C, a thermometer such as a radiation thermometer for measuring the temperature of the strip 2 in a non-contact manner.

Reference numeral 9 denotes a strip lower surface cooler controller for sequentially sending ON / OFF signals to the strip lower surface coolers 6A to 6C, and 10 denotes table roller cooling for sequentially sending ON / OFF signals to the table roller coolers 7A to 7C. Machine controller,
12 sends a control command to the strip lower surface cooler controller 9 and the table roller cooler controller 10 and while the strip lower surface coolers 6A to 6C and the table roller coolers 7A to 7C are off. This is a main controller for sequentially capturing output signals from the thermometers 8A to 8C and displaying them on the display unit 12.

According to the present invention having the above structure,
According to the strip surface temperature measuring device, the surface temperature of the strip is measured as follows. That is, when a command to turn on / off the cooling water is issued from the main controller 11 to the strip lower surface cooler controller 9 and the table roller cooler controller 10 for a predetermined time, for example, every 10 seconds, the strip lower surface cooler 6A. To 6C and table roller coolers 7A to 7C, the cooling water is jetted to the lower surface of the strip 2 in an on / off pattern as shown in FIG. In FIG.
(A) is an on / off pattern of cooling water from the coolers 6A and 7A,
(B) is an on / off pattern of cooling water from the coolers 6B and 7B,
(C) shows the on / off pattern of the cooling water from the coolers 6C and 7C. The cooling water from the upper surface cooler 4 of the strip 2 is constantly sprayed toward the upper surface of the strip 2.

The output signals from the thermometers 8A to 8C when the lower surface of the strip 2 is cooled in this manner are as shown in (D), (E) and (F) of FIG. Figure 2 (D) shows
The output signal from the thermometer 8A, FIG. 2 (E) is the output signal from the thermometer 8B, and FIG. 2 (F) is the output signal from the thermometer 8C. As is clear from the figure, when the measurement field of view is blocked by the cooling water, the output becomes unstable.

The main controller 11 selectively takes in the output signals from the thermometers 8A to 8C and causes the display 12 to display them. That is, first, as shown in FIG. 2 (D) from the thermometer 8A, the measurement field of view is not obstructed by the cooling water being turned off.
Capture a stable output signal. Next, after a lapse of T time, a stable output signal is fetched from the thermometer 8B as shown in FIG. 2 (E). Next, after T time has passed, the thermometer
Capture a stable output signal from 8C as shown in Fig. 2 (F). Then, after a lapse of T time, a stable output signal is fetched from the thermometer 8A as shown in FIG. 2 (D). Similarly, only the stable output signal from each thermometer is sequentially taken in the same way. As a result, the display 12 displays the output signal as shown in FIG. The temperature displayed by the indicator 12 shows a representative value of the temperature of the strip 2 which is not affected by cooling water or the like.

After the lapse of time T, the output signal from the thermometer is taken in because the cooling water does not stop instantly even if a cooling water stop command is issued to the coolers 6A and 7A, and there is some delay. Also, this is to prevent the measurement field of view of the thermometer from being blocked by the fact that the cooling water does not disappear immediately even if the cooling water stops.

When the difference in the installation positions of the thermometers 8A to 8C and the temperature difference due to the machine difference cannot be ignored, the output signal of the thermometer is corrected as follows. That is, the main controller 11
When the output signal from each thermometer is switched by, the output signal difference before and after switching ΔT _AB (the output signal difference between the thermometers 8A and 8B), ΔT _BC (the output signal difference between the thermometers 8B and 8C), The output signal difference ΔT _CA (output signal difference between the thermometers 8C and 8A) is stored in the main controller 11. Then, for example, when the output signal from the thermometer 8B is used as a reference, ΔT _BC is minus (the thermometer 8B
Is larger than the output signal from thermometer 8C) and ΔT _AB is positive (the output signal from thermometer 8B is smaller than the output signal from thermometer 8A), When the controller 11 takes in the output signal from the thermometer 8B, it outputs the output signal from the thermometer 8B to the display 12 as it is. Next, when the main controller 11 is taking in the output signal from the thermometer 8C, the output signal difference ΔT _BC stored in advance in the main controller 11 is added to the output signal from the thermometer 8C to display the indicator. Output to 12. Next, the main controller 11 is the thermometer.
When capturing the output signal from 8A,
The output signal difference ΔT _AB stored in advance in 11 is subtracted and output to the display 12. As a result, it is possible to correct the temperature difference due to the displacement of the installation positions of the thermometers 8A to 8C and the instrumental error.

The above is the case of three thermometers, but if the target finishing temperature is low and the cooling stop time cannot be extended, the number of thermometers may be increased. On the other hand, if the target finishing temperature is high and the cooling stop time can be extended, the number of thermometers may be reduced.

[0020]

As described above, according to the present invention, the temperature can be measured while the jet of cooling water is stopped, so that the surface temperature of the strip is not affected by the cooling water. It is possible to measure continuously and with high accuracy, and moreover, by correcting the measurement error due to the installation position of each thermometer and instrumental error, the surface temperature of the steel plate can be measured with higher accuracy. A useful effect such as being able to do is brought.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a strip surface temperature measuring device according to the present invention.

FIG. 2 is a graph showing ON / OFF patterns of cooling water from the strip lower surface cooler and the table roller cooler, output signals from each thermometer, and output signals from the main controller.

[Explanation of symbols] 1: hot finish rolling mill, 2: strip, 3A to 3H: table roller, 4: upper surface cooler, 5: winder, 6A to 6C: lower surface cooler, 7A to 7C: table roller Cooler, 8A to 8C: thermometer, 9: strip bottom cooler controller, 10: table roller cooler controller, 11: main controller, 12: indicator.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location G01K 13/06 7267-2F

Claims (2)

[Claims] 1. After being rolled by a hot continuous rolling mill,
An apparatus for continuously measuring the temperature of a strip moving on a table roller in the direction of the winder, comprising: a strip lower surface cooler provided between the table rollers; and a strip lower surface cooling device. Table roller cooler provided close to the container, a thermometer for measuring the temperature of the strip without contact, provided near the strip lower surface cooler and the table roller cooler, and ON / OFF signals are sequentially sent to the strip bottom cooler and the table roller cooler, and
The surface of the strip, comprising: a controller for sequentially capturing output signals from the thermometer while the strip lower surface cooler and the table roller cooler are off and displaying them on a display. Temperature measuring device. 2. The controller has a function of storing an output signal difference between the thermometers and correcting the output signal from the thermometer based on the output signal difference. The surface temperature measuring device of the strip according to claim 1.