JPH0361123B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shape detection device for detecting the shape of a leading end or trailing end of a steel material during rolling in a hot rolling process of steel.

A conventional device of this type is shown in FIG.

In the figure, 1 is a red-hot steel plate, and 2 is an object detector (hereinafter referred to as
(abbreviated as MHD), 3 is a distance detector (hereinafter abbreviated as PLG) that sends out a pulse signal every time the red-hot steel plate 1 travels a certain distance; Trigger generation circuit that sends a signal when the rear end is detected; 5
6 is a counting circuit that counts the number of pulses sent out from the PLG 3 from the time when the trigger signal is received; 6 is a counting circuit 5 that compares the counting result with a predetermined set value _N1 ;
A comparator that sends out a matching signal when the two match, 7 is an imaging lens, and 8 is a group of photoelectric elements arranged in the width direction of the red-hot steel plate 1. The infrared rays radiated from the steel plate 1 are condensed and imaged, and the radiant energy incident from the red-hot steel plate 1 is converted into electrical signals, which are sequentially output as time-series signals. Reference numeral 9 denotes an amplifier that amplifies the time series signal output from the photoelectric element group 8, and 10 converts the time series signal amplified by the amplifier 9 into a digital signal for a predetermined period of time from the time when the detection signal from the comparator 6 is input. 11 is a storage device that records the shape data of the red-hot steel plate 1 outputted from the quantization device 10;
is a calculation process in which the shape data recorded in the storage device 11 is read out and processed, and the shape of the red-hot steel plate 1 is extracted.

Next, the operation will be explained.

The tip of the red-hot steel plate 1 flowing through the rolling process is MHD.
2, the trigger generation circuit 4 outputs a detection pulse.

The counting circuit 5 starts from the time when the detection pulse is input.
Start counting the number of pulses output from PLG3. The value N ₁ set in the comparator 6 is determined by the value N 1 set in the comparator 6 while the red-hot steel plate 1 moves the distance from the detection field S ₁ of the MHD 2 to the detection field S 2 of the photoelectric element group 8.
It is set equal to the number of pulses output by the PLG 3, and the moment the tip of the red-hot steel plate 1 reaches the detection field of view _S2 of the photoelectric element group 8, a coincidence signal is output from the comparator 6. Therefore, the digital signal output from the quantization circuit 10 is within a predetermined length range from the tip position of the red-hot steel plate 1, and is expressed as m×n two-dimensional data indicating the tip shape of the red-hot steel plate 1. It is recorded in the storage device 11.

Therefore, the arithmetic device 1 performs predetermined image processing on the shape data stored in the storage device 11.
2, the tip shape of the red-hot steel plate 1 can be extracted.

Since the conventional shape measuring device is configured as described above, there may be a detection error of the MHD2, a variation in the detection point due to the deformation of the tip shape of the red-hot steel plate 1, and furthermore, there may be problems between the drive mechanism of PLG3 and the red-hot steel plate 1. When a slip or the like occurs, the timing when quantizing a time-series signal changes. Therefore, if the amount of variation exceeds the storage capacity of the storage device 11, there is a drawback that shape data is lost and the extracted shape becomes inaccurate.

This invention was made in order to eliminate the drawbacks of the conventional devices as described above, and includes an end detection device that detects when the leading or trailing end of the red-hot steel material reaches the photoelectric element group. The quantization of the time-series signal is started from the point in time.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, a reference numeral 13 detects that the leading edge or trailing edge of the red-hot steel plate 1 enters or escapes from the detection field of view S ₂ from the time-series signal output from the amplified photoelectric element group 8, and outputs an edge detection signal. This is an end detection device for sending out.

Next, the operation of this embodiment will be explained.

The end detection device 13, as shown in FIG. 3a,
The point in time when the tip of the red-hot steel plate 1 enters the detection field of view _S2 is detected from the change in the time-series signal input from the photoelectric element group 8, and the edge detection signal is quantized in the next stage as shown in Figure 3b. Send it to the device 10. Quantization device 10
converts the time-series signal inputted from the photoelectric element group 8 from the time when this edge detection signal is inputted into a digital signal.

Therefore, as shown in FIG. 4, the red-hot steel plate 1 stored in the storage device 11 in synchronization with the start of quantization.
The shape data of the tip of is a constant starting address A _s
From then on, the same number of pieces, in other words, the same steel plate length L _s is always written. Therefore, the next stage arithmetic unit 12
Since the starting point is clear even in image processing carried out by , no extra arithmetic processing is required and the processing time is shortened. Note that the steel plate written in the storage device 11
L _s is set to such a length that even if the tip of the red-hot steel plate 1 undergoes a sudden change in shape, a part of it will not come off, and a stable processing result can always be obtained.

According to this invention, the tip of the red-hot steel plate is directly detected from the time-series signal of the photoelectric element group, and the shape data is recorded in the storage device from the time of detection, so the capacity of the storage device can be reduced. , and there is no loss of shape data, so accurate shapes can be extracted.

Next, the shape extraction of the rear end portion of the red-hot steel plate 1 is performed in the fifth step.
As shown in the figure, shape data of the tip of red-hot steel plate 1 A ₁
Even after the loading of the photoelectric element group 8 is completed, the photoelectric element group 8
The time-series signal output from is quantized, and starting from the first address _As , the previous shape data _A1 is sequentially erased and rewritten with the next shape data _A2 . In this way, the shape data is sequentially rewritten to the storage device 11, and when the end detection signal of the red-hot steel plate 1 is output from the end detector 13, the rewriting operation is stopped.

At this time, the arrangement of the shape data in the storage device 11 is usually the shape data A _o of the rear end portion of the red-hot steel plate 1 and the previous data A _o-1 , as shown in FIG. These shape data are rearranged around the memory address A _p at the time when the rear end of the red-hot steel plate 1 is detected, as shown in FIG. Image calculation processing can be performed easily and efficiently.

In the above embodiment, the detection signal of the edge detection device 13 is input to the quantization device 10, and the detection signal is inputted to the storage device 1.
1, the quantization device 10 is always operated, and the detection signal output from the edge detector 13 controls the start point of writing shape data into the storage device. You may also do so.

As described above, according to the present invention, when the leading edge and trailing edge of the red-hot steel plate reliably enter or exit the detection field of view in the edge detection device, time series example data is quantized into shape data, and Since the operation of importing the shape data into the storage device is controlled, the memory area can be used effectively and the steel plate image extraction process can be performed stably.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing the configuration of a conventional shape measuring device, Fig. 2 is a system diagram of an embodiment of the present invention, Fig. 3 is an explanatory diagram of the generation timing of the tip detection signal, and Figs. 4 to 7 Each figure shows shape data stored in a storage device. In the figure, 1... red-hot steel plate, 7... imaging lens, 8... photoelectric element group, 9... amplifier, 10...
quantization device, 11... storage device, 12... arithmetic device, 13... end detection device. In addition, in the figure,
The same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A group of photoelectric elements arranged in plurality in the width direction of the traveling steel material, sequentially scanning the shape of the steel material at regular intervals and outputting it as a time series signal, detecting the leading or trailing end of the steel material from the time series signal. a quantization device that outputs shape data obtained by quantizing the time-series signal and converting it into a digital signal; and a storage area that stores a predetermined amount of the shape data; From the time when the detection device detects the tip of the steel material, the shape data is recorded from the predetermined start position to the predetermined end position in the storage area, and the shape data next to the shape data recorded at the predetermined end position is stored again at the predetermined start position. and a storage device that stops recording the shape data when the end detection device detects the rear end of the steel material, and a storage device that stops recording the shape data when the end detection device detects the tip of the steel material. After that, the tip shape of the steel material is extracted from a predetermined amount of the shape data recorded in the storage area, and after the storage of the shape data in the storage area stops, the shape of the tip of the steel material recorded in the storage area is extracted. A shape detection device including an arithmetic device that extracts the rear end shape of the steel material by changing the arrangement of shape data.