JPH05228723A - Observing method for produced scrap in side trimmer and its device - Google Patents

Abstract

PURPOSE:To stop a production line before scrap trouble becomes serious one by detecting the scrap trouble, such as clogging and flying out or the like, occurring in a scrap guide in a short time. CONSTITUTION:A produced scrap observing device is composed of two sets or more of detecting means (8a-8c) to optically detect the existence of a scrap which are provided along the direction of the progress of the scrap in a scrap progress route where a belt-shaped scrap 4 produced at both the ends of a metallic strip 1 in a side trimmer 2 provided on the continuous process line of the metallic strip is scrap-processed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring method for monitoring a trouble in which a strip-shaped scrap generated in a side trimmer installed in a continuous process line for metal strips is clogged or cut in a scrap guide. Regarding the device.

[0002]

2. Description of the Related Art In continuous process lines for metal strip such as pickling line, annealing line and plating line,
Usually, a pair of upper and lower circular cutters are set at predetermined positions on both ends of the strip width direction, and side trimmers are usually installed to continuously cut and remove the parts (also called ears) exceeding the finishing width on both ends of the metal strip. Is. Since the cut ear scraps are usually in the form of continuous strips, a scrap processing facility that cuts the strips into strips into strips is attached to the side trimmer. In addition, a guide path called a gutter-shaped or cylindrical scrap guide is provided from the vicinity of the circular cutter of the side trimmer to the scrap processing equipment.

In recent years, the process line has tended to be faster due to the improvement in productivity, and about 150 m / min is very common. The traveling of scrap becomes extremely unstable with the increase in speed, and the amount of scrap generated per unit time also increases in proportion to the line speed. If the scrap is caught and caught in the scrap guide due to a slight deformation of the scrap guide or a change in the shape of the scrap itself, the subsequent scrap is immediately clogged in the scrap guide. Alternatively, if there is a width variation part on the mother board before side trimming, the width of the scrap that is generated also fluctuates greatly, and in extreme cases, there is no trimming allowance and the scrap is interrupted, or subsequent scrap jumps out of the scrap guide and It gets caught in the device.

Even if such an accident occurs, the operation of the process line itself is not hindered, and the line is not stopped immediately. Therefore, if the discovery is delayed, the amount of scrap that is clogged or pops out will be huge and the scrap guide or Since a long line stop is forced to remove the scrap around, there is a big loss in efficiency and quality.Therefore, there is a case where workers are constantly monitored to monitor the behavior of scrap, which significantly increases productivity. It was blocking. Further, the above-described scrap removing work around the scrap guide is an extremely dangerous work that is easily involved in an accident, and a measure has been desired from the viewpoint of safety.

Therefore, in order to avoid such a trouble, as shown in Japanese Patent Laid-Open No. 3-166006, the strip width of the metal strip before trimming is continuously measured, and the strip width is narrow and difficult to trim. It has been proposed that a notch is made at the start point and the end point by a notcher, and trimming is interrupted during this period. However, the trouble of scrap in the scrap guide as described above is
It does not occur only due to the insufficient width of the plate, but it is due to various causes such as poor adjustment of the cutter of the side trimmer, poor centering of the metal strip, wear and detachment of the scrap guide member, and so on. This technology alone is not a complete solution.

[0006]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention The present invention copes with any trouble of scrap in the scrap guide caused by various causes as described above, and takes a measure in an instant to stop the line for a long time. It is an object of the present invention to provide a scrap monitoring method and apparatus that prevent the occurrence of such situations.

[0007]

The monitoring method of the present invention comprises: a side trimmer installed in a continuous process line for metal strips, in a scrap advancing path for scraping strip-shaped scraps generated from both ends of the metal strips; Two or more detection means for optically detecting the presence or absence of scrap are installed in the scrap traveling direction, and the scrap passing condition is judged by comparing the scrap passing signal and the line speed of the process line at that time. Is characterized by.

Further, the monitoring device of the present invention, in the side trimmer installed in the continuous process line of the metal strip, determines whether or not there is a scrap in the scrap advancing route for scraping strip-shaped scraps generated from both ends of the metal strip. It is characterized in that two or more detecting means for optically detecting are installed in the traveling direction of the scrap.

[0009]

[Operation] According to the present invention, in the side trimmer installed in the continuous process line of the metal strip, the presence or absence of the scrap is optically detected in the scrap advancing route for scraping the strip-shaped scrap generated from both ends of the metal strip. Two or more detection means for detecting the scrap are installed in the traveling direction of the scrap, and the passing condition of the scrap is judged by comparing the presence or absence of the scrap and the line speed of the process line at that time. By analyzing the output signal from the means, it is possible to instantly determine the occurrence of trouble and its type, instruct the worker to take appropriate measures, and avoid a serious situation such as a long line stop.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. 1
Is a metal strip that advances in the direction of the arrow, 2 is a side trimmer, 3 is a scrap guide, 4 is a band-shaped scrap generated by the side trimmer, and 5 is a scrap treatment called a scrap chopper that cuts this band-shaped scrap into a certain length. The strip-shaped scrap 6 cut by the equipment is discharged out of the line by the scrap conveyor 7 below.

Reference numerals 8a, 8b, and 8c are a pair of detection means for optically detecting the presence or absence of scraps, each of which is composed of a projector and a light receiver. 8a is an input side of the scrap guide 3, 8b is an output side of the scrap guide 3, and 8c. Both of the output sides of the scrap chopper 5 are installed in the scrap advancing path at positions facing each other with the scrap interposed therebetween. The light source may be ordinary natural light, but it is preferable to use a laser beam of a specific wavelength because it has the advantage of preventing noise. Further, compressed air or the like may be constantly blown onto the surfaces of the light projector and the light receiver in order to prevent accumulation of dust.

When the scrap is present in the scrap advancing path and the light from the projector is blocked by the scrap and does not reach the photoreceiver, that is, when the output of the photoreceiver is 0, the signal processing means 9 processes the signal to indicate "there is scrap. "That is ON
When there is no scrap for some reason and the light source of the floodlight is received, "no scrap" is output.
That is, OFF is output.

The signals from the respective detecting means 8a, 8b and 8c are processed by the signal processing means 9 as described above and input to the calculating means 10. On the other hand, the line speed detected by the side trimmer drive unit 21 is also input to the calculation means 10, and the type of accident assumed in advance is discriminated by the combination of the scrap detection signal and the line speed to output the alarm output means 11 and the monitor device 12.
Output to.

The alarm output means 11 may be, for example, a means for generating a voice signal to a driver's seat where an operator is present, or a timer switch for making an emergency stop of the process line after a lapse of a certain time. The monitor device 12 is a lamp or a CRT that displays the type of accident. 2 and 3 show examples of signals from the detecting means 8a, 8b and 8c and line stop situations in the embodiment of FIG.

In the example of FIG. 2, although the scrap processing was carried out smoothly until then, a scrap jam suddenly occurred in the scrap guide at time t ₁ . The signals from the detection means 8a and 8b in the scrap guide 3 remain "with scrap", but the signal is changed to "without scrap" because there is no scrap to be discharged at 8c on the output side of the scrap chopper 5. If there is scrap in the scrap guide, there is no scrap to be discharged, and the line speed is not 0, if a certain time elapses until time t ₂ , the computing means 10 determines that the scrap is clogged, and immediately issues a line stop instruction. The line stops at time t ₃ . From occurrence of clogging to line stop
It was 2.5 seconds.

Since the scrap in the scrap guide moves while swinging vertically and horizontally, the output signals of the detecting means 8a and 8b are repeatedly turned on and off as shown in FIG. Since there is no shake, the signal remains ON. It should be noted that, in this figure, the detection means 8b changes with the ON signal remaining before 8a, but the clogging of the scrap in the guide generally progresses from the scrap chopper side to the upstream side.

On the other hand, the output signal of the detecting means 8c has a repeated ON / OFF waveform, although it is different from 8a and 8b because scrap is cut and passes intermittently. In the example of FIG. 3, the scrap processing has been smoothly performed until then, but at time t ₁ , the scrap suddenly jumps out from the entrance of the scrap guide, and the signals from the detection means 8a and 8b in the scrap guide are successively output. Then it changed to "no scrap". If there is no scrap in the scrap guide and the state where the line speed is not 0 continues, the discharged scrap will also be “none”, but there is no need to wait for that condition, so a line stop instruction is issued immediately and at time t ₃ The line is stopped at. It took 2.2 seconds from the occurrence of jumping to the stop of the line.

As described above, it is desirable to install two or more scrap detecting means of the present invention in the scrap advancing direction, for example, one or more in the scrap guide and one on the output side of the scrap chopper.

[0019]

According to the present invention, it is possible to deal with any troubles occurring in the scrap guide and to immediately stop the line in a short time of 2 to 3 seconds before it becomes important. The recovery procedure was extremely easy, and the line down time was greatly shortened to improve productivity and safety.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a graph showing an example of signal processing according to the present invention.

FIG. 3 is a graph showing another example of signal processing according to the present invention.

[Explanation of symbols]

 1 Metal Strip 2 Side Trimmer 3 Scrap Guide 4 Scrap 5 Scrap Chopper 8a, 8b, 8c Detection Means 9 Signal Processing Means 10 Computing Means 11 Alarm Output Means

Front page continued (72) Inventor Yasuo Ichii 1 Kawasaki-cho, Chiba-shi, Chiba Inside the Chiba Steel Works, Kawasaki Steel Co., Ltd. (72) Koji Masumi 1 Kawasaki-cho, Chiba-shi, Chiba Inside the Chiba Works

Claims (2)

[Claims] 1. A detection for optically detecting the presence or absence of scrap in a scrap traveling path for scrap processing band-shaped scrap generated from both ends of the metal strip in a side trimmer installed in a continuous process line of the metal strip. Two or more means are installed in the scrap advancing direction, and the passing condition of the scrap is judged by comparing the passing signal of the scrap with the line speed of the process line at that time. Monitoring method. 2. A detection means for optically detecting the presence or absence of scrap in a scrap advancing path for scrap processing band-shaped scrap generated from both ends of the metal strip in a side trimmer installed in a continuous process line of the metal strip. A device for monitoring scraps generated in a side trimmer, in which two or more units are installed in the scrap traveling direction.