JPH11281488A - Tie plate temperature measuring method and device and the plate heating control method and device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature measuring method and device for a tie plate in the length direction which eliminates any effect of disturbance such as cooling water stuck to the surface of the tie plate. SOLUTION: When a radiation thermometer 11 simultaneously receives width- directional radiation lights of a tie plate (a), it is photoelectrically transferred so as to output multipoint temperature signals S1 in the width direction. A temperature converter 12 obtains temperature distribution pattern signals S2 based on the temperature signals S1 and outputs the temperature distribution pattern signals S2 and synchronous signals S3. A peak temperature detector 13 holds the maximum voltage value (maximum temperature) among the temperature distribution pattern signals S2 and outputs it to a temperature deviation detector 14. The temperature deviation detector 14 compares the peak temperature signals S4 inputted every moment with the target value to find the deviation and the found deviation is outputted as the deviation signals S5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for measuring the temperature of a strip used in a hot rolling process, and a method of controlling heating of a strip using the same and a heating control apparatus therefor.

[0002]

2. Description of the Related Art In recent years, at the time of hot rolling of steel, between a rough rolling mill and a finishing rolling mill, a tail end of a preceding strip and a tip of a succeeding strip are joined by a joining device. So-called endless rolling, in which a strip and a succeeding strip are continuously finish-rolled, has been performed.

[0003] When performing endless rolling, it is necessary to make the distance between the leading strip and the trailing strip close to each other after rough rolling. Therefore, equipment such as a sheet bar coiler is introduced, and the entrance side of the finishing mill is introduced. In this zone, the strip material is once wound up, and then the strip material is unwound at an appropriate timing.

However, since the strip material is once wound up in the zone on the inlet side of the finishing mill and stays there for a certain period of time, the outer wound portion and the inner wound portion of the wound strip material are different from each other. However, there is a problem that the temperature is lowered as compared with the case of the above, and the inconvenience that the rolling quality cannot be ensured occurs.

Therefore, recently, a so-called sheet bar heater device has been devised in which a portion where the temperature of the strip material decreases in the longitudinal direction is heated at the entrance side of the finishing mill, and a temperature compensation of the strip material is performed prior to the finish rolling. To make the temperature in the longitudinal direction uniform. Then, in order to make the temperature in the length direction of the strip plate uniform using the sheet bar heater device, it is necessary to accurately measure the temperature change in the length direction.

Conventionally, a spot-type radiation thermometer 1 has been used for measuring the temperature in the longitudinal direction of a strip as shown in FIG. 5, and a measurement field 2 of the radiation thermometer 1 has a spot shape. Is what you do. The radiation thermometer 1 outputs the average temperature of the strip material a in the measurement visual field 2 to the temperature converter 3,
A signal as shown in FIG. 6B or 6C is obtained from the temperature change detector 4.

[0007]

However, in the conventional spot-type radiation thermometer 1, the strip plate material is disturbed by disturbances such as cooling water adhering to the surface of the strip plate and an oxide film formed on the surface of the strip plate. Disadvantageously that the temperature in the longitudinal direction cannot be measured accurately. That is, when the measurement field of view 2 of the spot-type radiation thermometer 1 is wide, the temperature change cannot be measured with high accuracy, and a signal as shown in FIG. On the other hand, if the measurement field of view 2 is narrow, the cooling water adhering to the surface of the band plate material or the disturbance of the oxide film generated on the surface of the band plate material is too large, and the signal as shown in FIG. And it is not possible to measure the surface temperature accurately.

Further, due to these inconveniences, even in the case where the temperature of the strip material is compensated by the sheet bar heater device as described above prior to finish rolling to make the temperature in the length direction uniform, There was also a disadvantage that the accuracy of the temperature control was inferior.

Accordingly, a first object of the present invention is to provide a method and apparatus for measuring the temperature of a strip material which can accurately measure the temperature in the longitudinal direction of the strip material without being affected by the disturbance. It is in.

A second object of the present invention is to provide a method for controlling the heating of a strip which can be controlled with high accuracy when the strip conveyed in the hot rolling step is heated to a target temperature. It is to provide the heating control device.

[0011]

In order to solve the above-mentioned problems and to achieve the first object of the present invention, according to the first aspect of the present invention, a strip material conveyed in a hot rolling step is processed. In the temperature measurement method for measuring the temperature along the length direction, a temperature distribution in a width direction at a predetermined position in a length direction of the strip is detected, a maximum temperature is detected from the detected temperature distribution, and the detected temperature is detected. A method for measuring the temperature of a strip material is provided, in which the maximum temperatures are sequentially taken and the taken maximum temperature is set as a measured temperature along the length direction of the strip material.

According to a second aspect of the present invention, in the method of measuring a temperature of the strip material according to the first aspect, the detection of the temperature distribution in the width direction of the strip material and the detection of the maximum temperature from the temperature distribution are performed at predetermined intervals. To do it.

According to a third aspect of the present invention, in the method for measuring a temperature of a strip material according to the first or second aspect, the measured temperature and the reference temperature of the strip material are measured along a length direction of the strip material. Temperature deviation.

Further, the present invention also provides the following measures. That is, according to the invention described in claim 4,
A temperature distribution detecting means for detecting a temperature distribution in a width direction at a predetermined position in a length direction of the strip material conveyed in the hot rolling step; and a maximum for detecting a maximum temperature from the temperature distribution detected by the temperature distribution detecting means. Temperature detecting means for sequentially measuring the maximum temperature detected by the maximum temperature detecting means, and taking the maximum temperature as the measured temperature along the length of the strip material. An apparatus is provided.

According to a fifth aspect of the present invention, in the strip plate temperature measuring apparatus according to the fourth aspect, each of the temperature distribution detecting means and the maximum temperature detecting means is detected at predetermined intervals.

According to a sixth aspect of the present invention, in the apparatus for measuring the temperature of a strip material according to the fourth or fifth aspect, the length of the strip material is determined from the taken-in measurement temperature and the reference temperature of the strip material. A deviation calculating means for obtaining a temperature deviation along the direction is provided.

According to a seventh aspect of the present invention, there is provided a sheet material to be conveyed in a hot rolling step in a width direction at a predetermined position in a longitudinal direction of the strip material. The temperature distribution is detected, the maximum temperature is detected from the detected temperature distribution, and the detected maximum temperature is sequentially taken in.
The maximum temperature taken in is taken as a measured temperature along the length of the strip, and a deviation is determined along the length of the strip from the measured temperature and a predetermined target heating temperature. Thus, there is provided a method for controlling heating of a strip material, which controls the amount of heating of the strip material.

The present invention also provides the following measures. That is, according to the invention described in claim 8, the temperature is set in the middle of the hot rolling step and detects the temperature distribution in the width direction at a predetermined position in the longitudinal direction of the strip material to be processed in the hot rolling step. Distribution detecting means, a maximum temperature detecting means for detecting a maximum temperature from the temperature distribution detected by the temperature distribution detecting means, and a maximum temperature detected by the maximum temperature detecting means are sequentially taken in; Deviation calculation means for obtaining a deviation along the length direction of the strip from the obtained measurement temperature and a predetermined heating target temperature, as a measurement temperature along the length direction, and during the hot rolling step. And a control means for controlling a heating amount of a heating means for heating the strip material so as to eliminate the deviation calculated by the deviation calculating means.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, prior to the description of the embodiment of the present invention, the principle of a method for measuring the temperature of a strip material will be described. This method of measuring the temperature of a strip is a method of detecting the temperature in the longitudinal direction of the strip, and the disturbance of cooling water adhering to the surface of the strip or the oxide film generated on the surface of the strip is within a certain range. And that the temperature of the disturbance is lower than the average temperature in the width direction of the strip.

Therefore, this method of measuring the temperature of the strip material focuses on this point, detects the temperature distribution in the width direction of the strip material conveyed in the hot rolling step, and determines the maximum temperature from the detected temperature distribution. The detected maximum temperatures are sequentially captured, and the captured maximum temperatures are determined as the measured temperatures in the length direction of the strip material. Therefore, the temperature in the longitudinal direction of the strip obtained in this manner is highly accurate even if a disturbance exists in a part of the strip, because the influence of the disturbance is eliminated.

Next, an embodiment of a method for measuring a temperature of a strip material and a temperature measuring apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram illustrating a configuration of an embodiment of a temperature measuring device for a strip material. FIG. 2 is a waveform diagram showing an example of waveforms of the temperature pattern signal and the synchronization signal.

As shown in FIG. 1, the apparatus for measuring the temperature of a strip material comprises a radiation thermometer 11 disposed above a strip material a conveyed in a hot rolling step, a temperature converter 12, A temperature detector 13 and a temperature deviation detector 14 are provided.

The radiation thermometer 11 has a line sensor 11a, and is arranged above the band plate a so that the length direction of the line sensor 11a coincides with the width direction of the band plate a. Further, the line sensor 11a has a wide visual field 15 to obtain a temperature distribution in the width direction of the band plate material a.
have. In other words, the line sensor 11a has a view range of about 3 mm in the rolling direction (length direction) LD of the strip material a.
On the other hand, the visual field range in the width direction WD of the strip material a is configured to be wide enough to obtain a temperature distribution in the width direction of the strip material a,
The temperature at many points in the width direction of the strip material a can be detected simultaneously. In FIG. 1, the line sensor 11a
Is designed to obtain the entire temperature distribution in the width direction of the band plate material a, but it is not always necessary to obtain the temperature distribution over the entire width.

The line sensor 11a of the radiation thermometer 11
When the light receiving surface simultaneously receives the radiation light in the width direction of the band plate material a,
Temperature signals S at a number of points in the width direction of the strip material a after being photoelectrically converted.
1 is obtained, and the obtained temperature signal S1 is output from the temperature converter 1
2 is output.

The temperature converter 12 obtains a temperature distribution pattern signal S2 as shown in FIG. 2A based on the temperature signal S1 from the radiation thermometer 11, and obtains the temperature distribution pattern signal S2 and the detection cycle. And a synchronizing signal S3 generated as shown in FIG. 2B to output the peak temperature detector 13.

The peak temperature detector 13 calculates a peak temperature (maximum temperature) in the temperature distribution pattern signal S2 for each detection cycle based on the synchronization signal S3, and outputs a peak temperature signal S4 to the temperature deviation detection unit 14. Is configured.

The temperature deviation detector 14 compares the peak temperature signal S4 outputted from the peak temperature detector 13 and inputted every moment with a reference temperature preset in the inside or a reference temperature set from the outside. Then, the deviation is obtained, and the obtained deviation is output as a deviation signal S5.

Next, the operation of measuring the temperature of the temperature measuring apparatus having such a configuration will be described with reference to FIGS. Now, the line sensor 11 of the radiation thermometer 11
When the light receiving surface a receives simultaneously the radiated light in the width direction of the band material a, photoelectric conversion is performed to obtain temperature signals S1 at many points in the width direction of the band material a, and the obtained temperature signal S1 is a temperature signal. Output to converter 12. The temperature converter 12 obtains the temperature distribution pattern signal S2 as shown in FIG. 2A based on the temperature signal S1 from the radiation thermometer 11, and obtains the temperature distribution pattern signal S2 and (B) in FIG. ) Is output to the peak temperature detector 13.

The temperature distribution pattern signal S2 shown in FIG. 2A has a temperature (vertical axis) represented by a curve or a broken line at each detection cycle (horizontal axis) of the radiation thermometer 11, and the temperature distribution pattern TP in the waveform of the signal S2 is the peak temperature in the width direction of the strip material a. The synchronization signal S3 shown in FIG. 2B is generated for each detection cycle of the radiation thermometer 11, that is, for each pulse period PS (horizontal axis) of one scanning scan period ST (horizontal axis) of the radiation thermometer 11. (Vertical axis).

The peak temperature detector 13 has a sampling period S
At T, the highest voltage value (the peak temperature in the width direction of the strip material a) in the temperature distribution pattern signal S2 is held, and this highest voltage value is output to the temperature deviation detector 14 as a peak temperature signal S4 for each pulse signal PS. I do. The peak temperature signal S4 output to the temperature deviation detector 14 has a waveform as shown in FIG.

The peak temperature detector 13 has a peak temperature detection circuit based on analog processing. Thus, the peak temperature detection circuit for analog processing provided separately from the radiation thermometer 11 for peak temperature detection. By doing so, the peak temperature detection delay can be reduced within twice the scanning time of the radiation thermometer 11.

As shown in FIG. 6 (a), the temperature deviation detector 14 compares the momentarily input peak temperature signal S4 with a predetermined reference temperature to determine the deviation, and determines the deviation. It is output as the deviation signal S5.

As described above, according to the method of measuring the temperature of the strip material and the embodiment of the temperature measuring device of the present invention, the temperature distribution in the width direction of the strip material a is detected, and the maximum value is obtained from the detected temperature distribution. The temperature was detected, and the detected maximum temperature was sequentially taken in, and the taken-in maximum temperature was used as the measured temperature in the length direction of the strip. For this reason, even if disturbance such as cooling water or an oxide film is present in a part of the width of the strip material a, the influence of the disturbance can be eliminated. The temperature of the strip can be accurately measured.

The temperature distribution detecting means in the inventions of claims 4 to 6 corresponds to the radiation thermometer 11 and the temperature converter 12 in FIG. 1, and the maximum temperature detecting means corresponds to the peak temperature detector 13. I do. The temperature deviation detector 14 of FIG. 1 corresponds to the deviation calculating means in the invention of claim 6.

Next, an embodiment of a heating control method and a heating control apparatus for a strip material according to the present invention will be described with reference to FIG. FIG. 3 is a diagram showing a configuration in a case where the embodiment of the heating control device for a strip material is applied to a hot rolling line.

In the hot rolling line, as shown in FIG. 3, a rough rolling mill (not shown) and a finishing rolling mill 16
A sheet bar coiler 17, which is disposed at the outlet side of the rough rolling mill and temporarily winds the strip a rolled by the rough rolling mill, and a sheet bar heater which is disposed at the inlet side of the finishing mill 16 and heats the strip a by induction heating. The device 18 is arranged. In this hot rolling line, a joining device (not shown) for joining the leading end of the strip material unwound by the sheet bar coiler 17 to the tail end of the preceding strip material is provided.

Further, the hot rolling line includes a strip material a
A heating control device for controlling the temperature in the longitudinal direction to a predetermined value. As shown in FIG. 3, the heating control device includes a temperature measurement device 10, a sheet bar heater control device 19, a measuring roll 20, and an encoder 21.
And a movement integration calculation unit 22.

The temperature measuring device 10 has the same structure as that of the temperature measuring device shown in FIG. 1, but the radiation thermometer 11 has a distance A from the position of the seat bar heater device 18 as shown in FIG. It is arranged at a fixed position on the upstream side in the rolling direction.

As will be described later, the sheet bar heater control device 19 is configured to control a heating amount and a heating timing when the sheet bar heater 18 heats the strip plate material a.

As shown in FIG. 3, the measuring roll 20 is provided between the radiation thermometer 11 and the sheet bar heater device 18 and rotates while being in contact with the strip material a. Further, an encoder 21 is attached to the measuring roll 20, and the encoder 21 is configured to output a rotation pulse signal S 6 to the movement integration calculating unit 22.

Using the rotation pulse signal S 6 from the encoder 21, the movement integrating operation unit 22 measures the time required for the strip material a to reach the sheet bar heater device 18 from the radiation thermometer 11, and measures the measured time. The arrival time is output to the seat bar heater control device 19.

Next, the heating control of the heating control device having such a configuration will be described with reference to FIG. Now, the light receiving surface of the line sensor 11a of the radiation thermometer 11 is
When the radiation light in the width direction of the band material a is simultaneously received, it is photoelectrically converted to obtain temperature signals S1 at a number of points in the width direction of the band material a, and the obtained temperature signal S1 is output to the temperature converter 12. You. The temperature converter 12 obtains the temperature distribution pattern signal S2 based on the temperature signal S1 from the radiation thermometer 11, and obtains the temperature distribution pattern signal S2 and the synchronization signal S2.
3 is output to the peak temperature detector 13.

As shown in FIG. 2, the peak temperature detector 13 holds the highest voltage value in the temperature distribution pattern signal 2 at the sampling period ST, and holds this highest voltage value for each pulse signal PS. Is output to the temperature deviation detector 4. The temperature deviation detector 14 converts the peak temperature signal S4 input every moment as shown in FIG. 6A into the target heating temperature S7 output from the seat bar heater device 19.
The deviation is obtained by comparing with the above, and the obtained deviation is outputted to the seat bar heater control device 19 as a deviation signal S5.

On the other hand, the movement integrating operation unit 22 measures the time required for the strip material a to reach the sheet bar heater device 18 from the radiation thermometer 11 by using the rotation pulse signal S5 from the encoder 21. The measured arrival time is output to the seat bar heater control device 19.

The sheet bar heater controller 19 controls the sheet bar heater device 18 at each temperature measurement point of the strip material a based on the deviation signal S5 from the temperature deviation detector 14.
Calculate the electric power to be supplied to each of them. Further, the seat bar heater control device 19 constantly detects a temporal change of the deviation signal S5 from the temperature deviation detector 14, and when there is a change, the change arrives at the seat bar heater device 18 at that timing. The time to perform is obtained based on the arrival time from the movement integration calculation unit 22. Then, the obtained arrival time is set as a timing when the seat bar heater control device 19 turns on or off power to the seat bar heater device 18 or a timing when the supplied power is changed.

As described above, according to the heating control method and the heating control apparatus for the strip material of the present invention, the temperature distribution in the width direction of the strip material a is detected, and the maximum temperature is detected from the detected temperature distribution. The temperature is detected, the detected maximum temperature is sequentially taken in, the taken-in maximum temperature is taken as the measured temperature in the length direction of the strip, the measured temperature is compared with the target heating temperature, and the deviation is obtained. The power supplied to the seat bar heater device 18 was determined based on the deviation. For this reason, even if disturbance such as cooling water or an oxide film exists in a part of the width direction of the strip material a, the influence of the disturbance can be eliminated, and in the temperature detection in the length direction of the strip material, the position of the temperature change and The temperature of the strip material can be accurately detected, and as a result, control for making the temperature in the longitudinal direction of the strip material a uniform can be performed with high accuracy.

The temperature distribution detecting means in the invention of claim 8 corresponds to the radiation thermometer 11 and the temperature converter 12 in FIG. 3, and the maximum temperature detecting means is the peak temperature detector 13.
The deviation calculating means corresponds to the temperature deviation detector 14, and the control means corresponds to the seat bar heater control device 19.
The sheet bar heater device 18 corresponds to the heating means.

Next, another embodiment of the heating control device for a strip material will be described with reference to FIG. As shown in FIG. 4, the heating control device according to the other embodiment includes a temperature measurement device 10A, a sheet bar heater control device 19A, a measuring roll 20, an encoder 21, and a movement integration calculation unit 22A. Have been.

The temperature measuring device 10A has a common part with the temperature measuring device 10 shown in FIG. 3, and is different in that the temperature deviation detector 14 is replaced with a temperature change detector 24. The temperature change detection unit 24 calculates the temperature change unit signal S8 at the timing when the peak temperature signal S4 inputted from the peak temperature detector 13 changes every moment as shown in FIG. Is configured to be output.

The moving integration calculating section 22A receives the temperature change section detection signal S8 from the temperature change section detector 24 and the encoder 21.
From the rotation pulse signal S6 from the controller 19A, a temperature change portion reaching signal S9 indicating that the temperature change portion has reached the seat bar heater device 18 is sent to the seat bar heater control device 19A.
Is configured to be output.

As will be described later, the seat bar heater control device 19A is configured so that the sheet bar heater device 18
Is configured to control the amount of heating and the timing of heating when heating is performed.

Next, the heating control of the heating control device configured as described above will be described with reference to FIG. Now
When the light receiving surface of the line sensor 11a of the radiation thermometer 11 simultaneously receives the radiated light in the width direction of the strip material a, it is photoelectrically converted to obtain temperature signals S1 at many points in the width direction of the strip material a. The obtained temperature signal S1 is output to the temperature converter 12. The temperature converter 12 obtains a temperature distribution pattern signal S2 based on the temperature signal S1 from the radiation thermometer 11, and obtains the temperature distribution pattern signal S2 and the synchronization signal S3.
Are output to the peak temperature detector 13.

As shown in FIG. 2, the peak temperature detector 13 holds the highest voltage value in the temperature distribution pattern signal 2 at the sampling period ST, and holds this highest voltage value for each pulse signal PS. To the temperature change unit detector 24.

In the temperature change section detector 24, FIG.
As described above, at the timing when the peak temperature signal S4 inputted from the peak temperature detector 13 changes every moment, the temperature changing section signal S8 is output to the moving integration calculating section 22A. Here, in the peak temperature signal S4 input to the temperature change part detector 24, as shown in FIG. 6A, the temperature change part clearly appears, so that the timing of the change can be accurately detected.

In the moving integration calculating section 22A, the temperature change section detection signal S8 from the temperature change section detector 24 and the encoder 2
The temperature change portion reaching signal S9 is output to the seat bar heater control device 19A based on the rotation pulse signal S6 from No.1.

The seat bar heater control device 19A determines the timing of turning on or off the power of the seat bar heater device 18 or the timing of changing the supplied power based on the temperature change portion arrival signal S9 from the movement calculation operation unit 22A. . In addition, the seat bar heater control device 19A
Measures the peak temperature signal S4 from the peak temperature detector 13 continuously, finds the deviation between the measured temperature in the longitudinal direction of the strip material a and the target heating temperature, and sets the deviation based on the deviation thus found. At each temperature measurement point of the plate material a, the electric power supplied to the sheet bar heater device 18 is determined. Further, at the timing when each measurement point reaches the seat bar heater device 18, the sheet bar heater control device 19A changes the input power to a predetermined value, and controls the heating of the strip material a.

In the above-described heating control device, the seat bar heater control device 19A determines whether to turn on or off the power of the seat bar heater device 18 based on the temperature change portion arrival signal S9 from the movement calculation operation unit 22A, or Since the change timing of the input power can be determined, there is an advantage that the control is easier than the control of the seat bar heater 18 in FIG.

Here, the temperature distribution detecting means according to the invention of claim 8 comprises the radiation thermometer 11 and the temperature converter 1 shown in FIG.
2, the maximum temperature detecting means corresponds to the peak temperature detector 13, the deviation calculating means and the control means correspond to the sheet bar heater control device 19A and the like, and the heating means corresponds to the sheet bar heater device 18. I do.

In the above embodiment, the radiation thermometer 1
Although the case where 1 is installed on the upstream side of the sheet bar heater device 18 has been described, instead, the radiation thermometer 11 is installed on the downstream side of the sheet bar heater device 18 to perform feedback control. Is also good.

[0060]

As described above, in each of the first to sixth aspects of the present invention, the temperature distribution in the width direction at a predetermined position in the length direction of the strip is detected, and the temperature distribution is detected based on the detected temperature distribution. The maximum temperature was detected, and the detected maximum temperature was sequentially taken in, and the taken-in maximum temperature was set as the measured temperature along the length direction of the strip. For this reason, even if disturbance such as cooling water or an oxide film is present in a part of the width of the strip, the influence of the disturbance can be eliminated. The temperature of the strip can be accurately detected.

According to the seventh and eighth aspects of the present invention, the temperature distribution in the width direction at a predetermined position in the length direction of the strip material conveyed in the hot rolling process is detected, and the detected temperature distribution is used as a reference. The maximum temperature is detected, the detected maximum temperature is sequentially captured, and the captured maximum temperature is used as the measured temperature in the length direction of the strip, and the measured temperature and a predetermined target heating temperature are used to determine the maximum temperature in the length direction of the strip. Along with the deviation
The heating amount of the strip is controlled so as to eliminate the obtained deviation. For this reason, even if disturbance such as cooling water or an oxide film exists in a part of the width of the strip, the influence of the disturbance can be eliminated, and the temperature change position and the temperature of the strip in the length direction of the strip. Can be accurately detected, and as a result, control for uniformizing the temperature in the length direction of the strip material a can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of an embodiment of a temperature measuring device for a strip material of the present invention.

FIG. 2 is a waveform diagram showing an example of waveforms of a temperature pattern signal and a synchronization signal.

FIG. 3 is a diagram showing a configuration in a case where an embodiment of a heating control apparatus for a strip material of the present invention is applied to a hot rolling line.

FIG. 4 is a diagram showing a configuration in a case where another embodiment of the heating control apparatus for a strip material of the present invention is applied to a hot rolling line.

FIG. 5 is a diagram showing a configuration of a conventional device.

FIG. 6A is a waveform chart showing an output from a peak temperature detector of the embodiment, and FIGS. 6B and 6C are waveform charts showing an output from a conventional apparatus.

[Explanation of symbols]

 a Strip plate material 10 Temperature measuring device 11 Radiation thermometer 12 Temperature converter 13 Peak temperature detector 14 Temperature deviation detector 18 Sheet bar heater device 19, 19A Sheet bar heater control device 20 Measuring roll 21 Encoder 22, 22A Movement integration calculation Part 24 Temperature change part detector

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Toshiaki Amagasa 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (72) Inventor Shigeru Isoyama 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki (72) Inventor Yasuo Ichii 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Corporation Chiba Works

Claims (8)

[Claims] 1. A temperature measuring method for measuring a temperature along a length direction of a strip material conveyed in a hot rolling step, wherein a temperature distribution in a width direction at a predetermined position in the length direction of the strip material is detected. The maximum temperature is detected from the detected temperature distribution, the detected maximum temperature is sequentially captured, and the captured maximum temperature is set as a measured temperature along the length of the strip. Temperature measurement method. 2. Detecting a temperature distribution in a width direction of the strip material;
2. The method according to claim 1, wherein the detection of the maximum temperature from the temperature distribution is performed at predetermined intervals. 3. The temperature of the strip material according to claim 1, wherein a temperature deviation is determined along the length direction of the strip material from the measured temperature and the reference temperature of the strip material. Measuring method. 4. A temperature distribution detecting means for detecting a temperature distribution in a width direction at a predetermined position in a longitudinal direction of a strip material conveyed in a hot rolling step; A maximum temperature detecting means for detecting a temperature, wherein the maximum temperature detected by the maximum temperature detecting means is sequentially taken in, and the taken-in maximum temperature is used as a measured temperature along the length direction of the strip material. An apparatus for measuring the temperature of a strip material. 5. The apparatus according to claim 4, wherein each of said temperature distribution detecting means and said maximum temperature detecting means is performed at predetermined intervals. 6. The apparatus according to claim 4, further comprising: deviation calculating means for calculating a temperature deviation along a length direction of the strip from the taken-in measurement temperature and a reference temperature of the strip. The temperature measuring device for a strip material according to claim 5. 7. A temperature distribution in a width direction at a predetermined position in a length direction of the strip material conveyed in the hot rolling step is detected, a maximum temperature is detected from the detected temperature distribution, and the detected maximum temperature is detected. The maximum temperature taken in is taken as a measured temperature along the length of the strip, and a deviation is determined along the length of the strip from the measured temperature and a predetermined target heating temperature. A heating amount of the strip material is controlled so that the deviation is eliminated. 8. A temperature distribution detecting means arranged in the middle of a hot rolling step, for detecting a temperature distribution in a width direction at a predetermined position in a length direction of the strip material processed in the hot rolling step; A maximum temperature detecting means for detecting a maximum temperature from the temperature distribution detected by the distribution detecting means; and a maximum temperature detected by the maximum temperature detecting means, sequentially taken, and the taken maximum temperature is measured along a length direction of the strip. A deviation calculating means for determining a deviation along the length direction of the strip from the measured temperature and the predetermined heating target temperature, the deviation calculating means being disposed in the middle of the hot rolling step, and calculating the deviation. Control means for controlling the amount of heating of the heating means for heating the strip material so that the deviation determined by the means is eliminated.