JPS6381204A - Diagnostic device for trimmer shearing state - Google Patents

Abstract

PURPOSE:To accurately detect the chipping of a trimmer shearing blade by detecting the unevenness of the edge of the trimmer blade in the form of distance and comparing it with a previously set threshold value of variation in unevenness. CONSTITUTION:The unevenness of the trimmer blade edge 501 due to breaking is detected by an optical range finder 1 in the form of distance. The output of the range finder 1 is inputted to a differentiation circuit 2 through an amplifier 10 to remove a signal based on the fitting defect of the blade itself, and then the variation of an unevenness signal is detected. The output of the circuit 2 is sent to a decision circuit 3 and compared with the threshold value of variation due to unevenness which is set previously in the circuit 3. When the signal exceeds the threshold value, a blade chipping signal is sent out to an alarm 4 to generate a warning, and the breaking of the trimmer shearing blade is accurately detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a trimmer shear state diagnostic device, and an object of the present invention is to detect chipping of a trimmer shear blade at an early stage.

[Conventional technology]

A trimmer device as shown in FIG. 4 is normally used to trim the width of a steel plate during manufacturing. This is done by sandwiching and shearing the steel plate X between an upper blade and a lower blade, thereby removing excess parts at both ends. Generally, a circular rotary blade is used to continuously rotate the blade.
After rimming, the scraps are chopped into appropriate lengths by a chopper 51 and processed. Conventionally, there has been a problem that if the cutting edge of the trimmer 50 is chipped, cracks (uneven shear roughness) will occur on the sheared surface of the steel plate X, resulting in a downgrade.

In the past, inspection personnel visually checked for chipped trimmer blades, but because the line speed is high and constant monitoring is required, oversights due to fatigue, etc. are inevitable. In most cases, the defect had already occurred by the time it was noticed. Similarly, when it comes to waste disposal, many abnormalities occur, such as the waste deviating from the designated route and getting wrapped around the trimmer body instead of being chopped. However, since the operator relies on visual inspection, there are cases where the detection is delayed. The majority were.

[Summary of the invention]

The present invention aims to detect the above-mentioned trimmer blade chipping at an early stage and prevent quality deterioration due to the blade chipping. For this purpose, the trimmer shear state diagnosis device according to the present invention includes an optical distance meter that detects the unevenness of the trimmer blade edge as a distance;
A device that detects the change in the unevenness signal compares the detected change with a preset threshold for the unevenness change, and when the detected value exceeds the threshold, the blade chipping occurs. The basic feature is that the device includes a device that outputs a signal.

〔Example〕

An embodiment of the present invention will be described below based on the drawings. - FIG. 1 is a block diagram of the trimmer blade 501, which is equipped with an optical range finder 1 that detects irregularities caused by chipping of the trimmer blade 501 as distance. There is no particular limitation on this, as long as a light emitting diode or a semiconductor laser is used. A differentiation circuit 2 is connected to the distance meter 1 via an amplifier 10, and detects a change in the unevenness signal.

This is because the installation of the blade itself eliminates signals caused by defects. A high-pass filter or the like may be used instead of the differentiating circuit. The output from the differentiating circuit 2 is sent to the determining circuit 3. A threshold value for the amount of change is set in advance in the circuit 3, and this threshold value is compared with the amount of change signal, and if the threshold value is exceeded, the blade chip outputs a signal. In this embodiment, the number of times a signal is sent is counted, and when a predetermined number n is reached, it is determined that a chipped blade has occurred. This judgment signal is sent to the alarm 4 to issue an alarm.

This embodiment is configured to detect not only blade chipping but also chipping.

That is, when the chopping is performed smoothly, vibrations are generated due to shredding, and when the chopping is no longer performed normally due to the debris being removed from the discharge route, the vibrations decrease dramatically. Therefore, a vibration pickup is attached to the chopper's bearing, or a microphone is installed near the chopper to issue an alarm when the level of vibration or sound falls below a preset value. however,
In this case, it is assumed that trimming is being performed, so the rotation of the trimmer or the signal for transporting the steel plate is entered as an AND condition.

To explain this using a block diagram, as shown in FIG. 1, the chopper blade 511 is equipped with a vibration sensor 20 to detect vibrations. This signal is input to a filter 21 via an amplifier 200, where noise is removed, and then sent to a determination circuit 22. The circuit 22 compares it with a preset value and determines that it is below the set value. circuit 22
In addition, the operation signal 24 is inputted, and the signal in which trimming is being performed is ANDed with the signal below the set value, and when this AND condition is met, the same signal is sent to the alarm 23 to issue an alarm. ing.

Figures 2 and 3 show data obtained with the device according to the invention. Figure 2 shows the results of blade chipping detection, and Figure 3 shows the results of clogging detection. In the detected case, the blade chipping was 1 point deep at 1 location on the circumference.
Although there was a chip in the am, a clear unevenness signal was detected every time the blade rotated, exceeding a preset threshold, and an alarm was issued. In actual equipment, there is a possibility of sudden noise entering, so instead of issuing an alarm immediately when the threshold is exceeded, measures are taken to issue an alarm three times, for example. It is also possible to automatically stop the line using this alarm signal.

In addition, in the same paper jam detection example, the vibration due to chopping disappears within the circle where the jam occurs, making it possible to clearly identify the jam.

With the device having the above configuration, it is possible to constantly monitor the detection of trimmer shear blade chipping with high accuracy, and the failures that conventionally occurred at about 20 coils per month per line have been almost completely eliminated. In addition, the number of line stoppages due to this issue, which used to be approximately 4 hours per month per line, has been drastically reduced.

(Effects of the Invention) As explained above, according to the trimmer shear state diagnosis device of the present invention, trimmer shear blade chipping can be detected constantly and accurately. Therefore, downgrading due to occurrence of paris can be reduced to almost zero, and production efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the trimmer shear state diagnosing device according to the present invention, FIGS. 2 and 3 are graphs showing examples of detection results, and FIG. 4 is an explanatory diagram of the trimmer device. 1... Optical distance meter, 2... Differential circuit, 3... Judgment circuit, 4... Alarm. Figure 1 Figure 2

Claims (1)

[Claims] An optical distance meter that detects the unevenness of the trimmer blade edge as a distance, a device that detects the change in the unevenness signal, and a preset threshold for the unevenness change and the detected change are compared. A trimmer shear state diagnostic device comprising: a device that outputs a blade chipping signal when the detected value exceeds a threshold value.