JPS6029889B2 - Heated metal surface temperature measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring the surface temperature of heated metal, and more specifically, the present invention relates to a device for measuring the surface temperature of heated metal. This invention relates to a temperature measuring device used to measure temperature.

Conventionally, a thermometer or the like has been used to measure the surface temperature of metal immediately after it is extracted from a heating furnace, or during blooming or hot forging. However, it is difficult to completely remove scale from the metal surface, and secondary scale is generated during blooming and hot forging. When these scale portions exist, the actual surface temperature cannot be accurately measured by measuring the surface temperature of the metal using a secondary technique such as an optical pyrometer L or a radiation thermometer. That is, when measuring the side temperature using a radiation thermometer, it is difficult to identify the scale portion, and therefore, it has not been possible to remove the influence of the scale portion and accurately measure the actual surface temperature. In addition, when measuring the side temperature using a photothermometer, the actual surface temperature can be measured by excluding the scale part by visual inspection by the measurer, but when measuring the surface temperature of metal that is moving during actual operation, visual inspection is necessary. It was almost impossible to remove the scale part and measure the accurate surface temperature of the body. An object of the present invention is to provide a temperature detection device that can eliminate the drawbacks of the prior art as described above, eliminate the influence of scale existing on a heated metal surface, and accurately measure the temperature of a real surface. That's true.

Next, embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 schematically shows the configuration of an embodiment of the temperature detection device of the present invention for measuring the actual surface temperature of a heated metal, for example, a steel ingot 3, which is moving in the direction of arrow A.

In this temperature detection device, temperature energy from minute areas on the surface of a steel ingot that are sequentially scanned is converted into radiation voltage pressure by an image sensor 5 through a lens system 4, and the temperature is detected.
The image sensor 5 uses radiant energy (light energy)
is converted into a box pressure, and the voltage V has a relationship of r with respect to the temperature T of the object. Another method is to sequentially scan and detect the surface temperature of the heated metal using a slit using a radiation thermometer, but using the image sensor 5 as in this embodiment requires a much simpler device configuration. This is preferable because it is simple.

In this embodiment, the lens system 4 is configured so that the measurement detection point 13 is a square on each side.

By moving the steel ingot 3 in the direction of arrow A in FIG. 1 and scanning along the temperature detection scanning line 2, the temperature distribution on the surface of the steel ingot is detected. The measurement principle of the present invention utilizes the fact that the scale part of a steel ingot left in the outside air, that is, room temperature, is cooled farther than the actual steel ingot. Considering that when scanning from the steel ingot body toward the scale part, the detected radiant energy suddenly decreases, while when scanning from the scale part to the steel ingot body, the detected radiant energy suddenly increases. This method detects the presence of a scale part and excludes leakage temperature results from the scale part to accurately measure the temperature of the actual surface of the steel ingot. The output from the image sensor 5 is serial (
Since data is output sequentially (sequentially), it is necessary to control how the data is output, and since the output voltage is low, it is necessary to increase the output voltage. The output circuit 7 performs these processes. To remove the cross-temperature results of the scale part, the output obtained from the image sensor 5 is passed through the output circuit 7, the output change generator 8 detects the output change, and the change peak determiner 9 detects the peak of the change. The output circuit 7
This is done by excluding, in the scale temperature removal circuit 10, the voltage output corresponding to the surface temperature obtained from the scale portion.

Therefore, in the temperature conversion circuit 11 which is a linearizer,
Only the voltage output representing the temperature corresponding to the solid surface of the steel ingot is passed through, and the temperature distribution at each part of the solid surface of the steel ingot is displayed by the temperature display circuit 12. The temperature display circuit 12 may display the average value, maximum value, or minimum value of the temperature of the substantial surface of the steel ingot. The scale portion determination method will be explained in more detail with reference to FIGS. 2 and 3.

First, when the detection scanning line 2 scans from the end of the steel core 3 toward the steel ingot 3 in FIG. 2, and the scale portion IA exists at the end, the steel For the output voltage from the output circuit 7 to the output change generator 8 corresponding to the radiant energy before scanning the edge of the steel ingot, the output circuit corresponds to the radiant energy on the surface of the steel ingot up to one rib from the edge of the steel ingot. The output voltage X from 7 to the output change generator 8 is rapidly increasing, and the output change generator 8 outputs a large oscillating pulse signal P, corresponding to the amount of change.

Furthermore, for the output voltage x N from the output circuit 7 to the output variation generator 8 corresponding to the radiant energy on the surface of the steel ingot on the N rib of the scale part IA, the radiation on the surface of the steel ingot on the (N+1) legs is The output voltage ×... from the output circuit 7 to the output change amount generator 8 corresponding to the energy is rapidly increasing,
The output change amount generator 8 outputs a large oscillating pulse signal P2 according to the amount of change. The variation peak determiner 9 detects the existence of the scale portion IA by detecting these pulses P and P2, sends a signal to the scale temperature removal circuit 10, and outputs a signal from the output circuit 7 corresponding to the scale portion IA. This voltage signal is not passed through the temperature conversion circuit 11. Next, in FIG. 2, when the detection scanning line 2 passes through the scale portion IB located approximately in the center of the steel ingot 3,
Figure 3 B' As shown, the starting end S of scale part 'B'
, the output change amount generator 8 is output from the output circuit 7.
Since the output voltage to the output voltage decreases rapidly, the output change amount generator 8
outputs a pulse signal P3 having a large negative amplitude corresponding to the amount of negative change, while the terminal S of the scale portion IB
2, the output change amount generator 8 is output from the output circuit 7.
Since the output voltage to the output voltage increases rapidly, the output change generator 8
outputs a pulse signal P4 having a large positive amplitude corresponding to the amount of positive change.

The variation peak determiner 9 detects these pulses P3 and P
4 to detect the existence of the scale portion IB, and send a signal to the scale temperature removal circuit 10 to prevent the voltage signal from the output circuit 7 corresponding to the scale portion IB from passing through to the temperature conversion circuit 11. . The metal end determination circuit 6 in the circuit of the apparatus shown in FIG. When detected, the scale temperature removal circuit 10 causes the voltage output from the output circuit 7 to start passing through the temperature conversion circuit 11, and when the rear end is detected, the scale temperature removal circuit 10 causes the voltage output from the output circuit 7 to start passing through the temperature conversion circuit 11. It operates so as not to pass the voltage output to the temperature conversion circuit 11.

[Brief explanation of drawings]

FIG. 1 of the accompanying drawings schematically shows the configuration of an embodiment of the temperature measuring device according to the present invention, and FIG. 2 schematically shows an example of a scanning line applied to the surface of a heated metal having a scale portion, such as a steel ingot. Figures 3A and 3B are diagrams illustrating the output state of the output variation generator when scanning a scale portion. IA, IB... Scale portion, 2... Temperature detection scanning line, 3... Steel ingot, 4... Lens system, 5... Image sensor, 6... Metal edge determination circuit, 7... ... Output circuit, 8... Output change amount generator, 9... Change amount peak determiner, 10... Scale temperature removal circuit, 11... Temperature conversion circuit, 12... Temperature display circuit, 13...Measurement detection point. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A temperature detection device that sequentially scans minute areas on the surface of a heated metal and sequentially generates temperature signals representing the temperature;
an indicating device for receiving a temperature signal from the temperature detecting device and indicating the temperature of the metal surface; a surface temperature removal circuit for a scale portion provided between the indicating device and the temperature detecting device; an output change amount generator that generates a signal representing the amount of change in the temperature signal from the temperature sensing device; A scale section determination device that sends a signal representing the temperature to the scale temperature removal circuit to prevent a temperature signal from the temperature detection device from passing through to the indicating device.