JP2023019683A - Trim chip detection device and trim chip detection method - Google Patents

Abstract

To provide a detection device and a detection method in which shearing abnormality and trim chip progress failures in a trimming process of a metal strip are detected accurately at an early stage.SOLUTION: Provided is a device for detecting a trim chip 3 in equipment having a guide 4 for guiding sheared trim chips 3 to a shredding or winding process, in shearing and removing both ends in a width direction of a metal strip 1 across a longer direction of the metal strip using a trimmer 2. The device includes a function in which a non-contact type distance meter 7 is arranged so as to accommodate the whole width direction of the guide 4 from above in a visual field, in order to constantly detect presence/absence of a trim chip 3 in the guide 4 and a height of the trim chip 3 and to determine shearing abnormality of the trimmer 2 or a progress failure of the trim chip 3.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a device for detecting abnormal shearing and poor movement of trim scraps, and more particularly to detecting height changes of trim scraps caused by jumping out of the guide chute or clogging in the guide guide. device.

The process of shearing both ends of a metal strip, for example, a steel plate in the width direction with a trimmer is intended to adjust the width to a predetermined width required by the next process and the customer. If the sheared steel plate scraps (hereinafter referred to as trim scraps) are not conveyed normally, the trim scraps may scratch the sheared steel plate, resulting in a decrease in yield. Therefore, when the trim scraps do not advance properly, it is necessary to immediately stop the line and correct the position of the trim scraps that have failed to advance or remove the trim scraps. Further, when the steel plate meanders in the line, a shearing abnormality occurs in which the trimmer cannot shear the steel plate in one width direction, and the width of the steel plate does not fall within a predetermined range.

For example, FIGS. 8 and 9 show examples in which the trim scrap 3 does not progress. In the example of FIG. 8, the trim scraps 3 come off the guide 4 and fly out to scratch the steel plate after trimming, and the steel plate 1 is scratched. Further, in the example of FIG. 9 , clogging in the guidance guide 4 results in jumping out of the guidance guide 4 , and the steel plate 1 is similarly scratched. Further, when the guide 4 is clogged with the trim waste 3 as shown in FIG. 9, it takes a long time to remove the trim waste 3 . Therefore, it is necessary to detect the jumping-out and clogging of the trim waste 3 at an early stage.

In this way, early detection of abnormal shearing and poor progress of trim scraps is an important issue in improving the yield and operating rate in the steel sheet manufacturing process.

Techniques have been developed to prevent trim scraps from advancing poorly. For example, Patent Document 1 discloses a method of installing a lid 10 on the top of an induction chute as shown in FIG. 10 as a trim scrap guide device for a side trimmer. is disclosed. Further, Patent Document 2 discloses a trim waste holder 11 capable of holding trim waste from above as shown in FIG. 11 .

Further, a method for detecting when trim scraps are not advancing properly has been developed. For example, Patent Document 3 discloses an ultrasonic wave level sensor 12 as shown in FIG. A method is disclosed for detecting a trim debris jam through constant monitoring. Further, Patent Document 4 discloses a method of installing a contact-type metal detector 13 as shown in FIG. 13 downstream of the trimmer.

JP-A-10-315043 JP-A-2007-160412 JP-A-2011-649 Japanese Patent Application Laid-Open No. 2009-61561

However, the prior art has the following problems.
Even if countermeasures are taken to reduce the occurrence of poor advance of trim scrap as in Patent Documents 1 and 2, the poor advance of trim scrap cannot be completely suppressed. In addition, as in Patent Documents 3 and 4, when detecting poor advance of trim scraps, there is a problem that the further downstream the detector is from the trimmer, the more disadvantageous it is for early detection.

Further, if the trim waste does not contact the sensor, the contact sensor described in Patent Document 4 may not be able to sense progress failure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and method for early and accurate detection of abnormal shearing and poor progress of trim scraps of metal strips.

The inventors have found that by installing a non-contact range finder in the immediate vicinity of the trimmer, early detection is possible, and shear anomalies and poor progress can be detected no matter what the behavior of the progress of the trimmings is. A trim scrap detector according to the present invention, which advantageously solves the above-described problems, shreds the sheared trim scrap when both widthwise ends of a metal strip are sheared and removed by a trimmer along the longitudinal direction of the metal strip. Alternatively, in equipment having a guide for guiding to a winding process, a device for detecting trim waste, wherein a non-contact rangefinder is installed so that the entire width direction of the guide can be seen from above, and the inside of the guide It is characterized by having a function of constantly detecting the presence or absence of trim scraps and the height of the trim scraps and judging abnormal shearing of the trimmer or poor advance of the trim scraps.

In addition, the trim waste detection device according to the present invention is
(a) having a function of avoiding erroneous detection when the height of the detected trim scrap is equal to or higher than an arbitrarily specified threshold, and determining that the trim scrap is not progressing properly;
(b) further having at least one of an automatic line stop function and an alarm output function when it is determined that the trim waste progresses poorly;
(c) having an ON-delay timer that allows avoiding false detections due to noise in the signal or sharp fluctuations in trim debris;
(d) having a masking function that allows avoiding false detections during line stop or trimmer alignment;
(e) having a function of determining that there is shearing abnormality due to meandering of the metal strip in the line when it is detected that there is no trim scrap in the guide installed at one end in the width direction of the metal strip;
etc. is considered to be a more preferable solution.

A method for detecting trim scrap according to the present invention, which advantageously solves the above-described problems, shreds or removes the sheared trim scrap when both ends of a metal strip in the width direction are sheared and removed by a trimmer along the longitudinal direction of the metal strip. A method for detecting trim waste in a guide that is guided to a winding process, wherein a non-contact rangefinder installed downstream of the trimmer is used to keep the entire width direction of the guide within a field of view from above, The presence or absence of trim scraps in the guide and the height of the trim scraps are constantly detected to judge abnormal shearing of the trimmer or poor movement of the trim scraps.

In addition, the trim waste detection method according to the present invention includes:
(f) When the height of the detected trim scrap exceeds an arbitrarily specified threshold value, it is determined that the trim scrap has progressed poorly after avoiding erroneous detection, and the line is automatically stopped and an alarm is issued. implementing at least one of the outputs;
(g) using an ON-delay timer to avoid false detections due to noise in the signal or sharp fluctuations in trim debris, and using a mask function to avoid false detections during line stops or trimmer repositioning; to implement at least one of
(h) judging that there is shearing abnormality due to meandering in the line of the metal strip when it is detected that there is no trim scrap in the guide installed at one end in the width direction of the metal strip;
etc. is considered to be a more preferable solution.

ADVANTAGE OF THE INVENTION According to this invention, the abnormal shearing of the trim waste of a metal strip plate and progress failure can be detected early and accurately.

1 is a schematic side view showing an arrangement of apparatus for practicing the invention; FIG. FIG. 2 is a sectional view taken along the line AA of FIG. 1, showing the field of view of the apparatus for practicing the invention; 1 is a conceptual diagram showing the configuration of an apparatus according to one embodiment of the present invention; FIG. 10 is a graph showing the output of the non-contact rangefinder when trim scraps do not advance properly in the above embodiment. It is the graph which monitored the output of the non-contact-type range finder for a long time in the said embodiment. FIG. 4 is a schematic plan view showing an outline of automatic position adjustment of the trimmer, in which (a) represents a state in which the preceding material is being trimmed, (b) represents a state in which the preceding material has been trimmed, and (c) is a rearward; Represents the state of trimmer auto-alignment for row material. It is a schematic block diagram showing the structural example of the said embodiment. FIG. 5 is a schematic side view showing an example of poor advance of trim waste; FIG. 10 is a schematic side view showing another example of poor advancement of trim waste; It is a schematic side view which shows the equipment which suppresses progress failure of patent document 1. FIG. It is a schematic side view which shows the equipment which suppresses progress failure of patent document 2. FIG. It is a schematic side view which shows the equipment which detects progress failure of patent document 3. FIG. It is a schematic side view showing equipment for detecting a progress failure described in Patent Literature 4. FIG.

Embodiments of the present invention will be specifically described below. Note that each drawing is schematic and may differ from the actual one. Moreover, the following embodiments are intended to exemplify devices and methods for embodying the technical idea of the present invention, and are not intended to limit the configurations to those described below. That is, the technical idea of the present invention can be modified in various ways within the technical scope described in the claims.

The inventors installed a non-contact rangefinder 7 in the immediate vicinity of the trimmer 2 in order to detect the trim scrap 3 as shown in FIG. As shown in FIG. 2, which is a cross-sectional view taken along the line AA of FIG. 1, the field of view 14 of the non-contact rangefinder 7 was selected so as to completely cover the range of the guide 4 in the width direction.

Also, the non-contact rangefinder 7 constantly detects the height of the trim scrap 3 . Specifically, the data logger 15 constantly monitors and stores the output value of the height of the trim scrap 3 in the configuration shown in FIG. Furthermore, in order to judge whether the output value of the data logger 15 is normal or not, the state of operation in the actual machine was confirmed by the video camera 16 . Here, "constant detection" includes intermittent detection at predetermined time intervals. Examples of the non-contact rangefinder 7 include a laser rangefinder, an ultrasonic sensor, a photoelectric sensor, an electromagnetic induction sensor, and the like.

FIG. 4 shows the output value data of the non-contact rangefinder 7 when the trim scrap 3 actually fails to advance in the configuration shown in FIG. 3, arranged in chronological order. As is clear from FIG. 4, at 30 when the trim scrap 3 did not progress properly, the height of the trim scrap 3 could be understood as how the trim scrap 3 floated up. The line must be stopped 31 at the time 30 when the trim waste 3 is not advancing properly. The non-contact rangefinder 7 is installed at a predetermined position within a range of 30 m downstream from immediately after the trimmer 2 (0 m). Note that the position immediately behind the trimmer 2 means the position of the downstream end of the trimmer 2, that is, the tangential position on the downstream side that is common to the pair of rolls constituting the trimmer 2 that are arranged facing each other with a gap. If the non-contact rangefinder 7 is too far downstream, it takes too much time to detect an abnormality, and there is a problem that the removal of trimmings takes time and the work becomes complicated. Preferably, the installation position of the non-contact rangefinder 7 is within the range of 0 to 10 m downstream from immediately after the trimmer 2, more preferably within the range of 0 to 2 m downstream.

The inventors confirmed the peak value of the height of the trim scrap 3 when the trim scrap 3 failed to advance a plurality of times, in order to determine the threshold value for judging the occurrence 30 of the trim scrap 3 advancing failure. Then, the minimum value was determined as the threshold value h of the height of the trim scrap 3 for judging the occurrence of poor advance of the trim scrap 3 .

Next, FIG. 5 shows the result of monitoring the output value of the non-contact rangefinder 7 over a long period of time in the configuration of FIG. At this time, the non-contact rangefinder 7 was installed at a position 2 m downstream from the trimmer 2 so that the visual field 14 could detect the entire width of the guide 4 . As is clear from FIG. 5, it was found that many points exceeded the threshold value h. Therefore, the state of progress of trim scraps was confirmed by a video camera at the time when the output value of the non-contact rangefinder 7 exceeded the threshold value h (N=136 points). Here, the OP work indicates the work of the operator. Trimmer APC indicates trimmer Auto Positioning Control for shearing different product widths in leading and trailing strips. TE bounce indicates that the trailing edge (TE) of the trimmings bounces off support when trimming is completed and the height of the trimmings exceeds a threshold h. Classification No. in Table 1 is shown in FIG. 1 to 4 are also written.

Class No. in Table 1. 1 indicates that a progress failure is detected, and can be determined by making the output value of the non-contact rangefinder 7 equal to or greater than the threshold value h. Classification no. In OP work 2, the operator notices that the trim waste is not progressing properly, and the operator arbitrarily stops the line to remove the trim waste. In that case, it is possible to perform mask processing by recognizing the line stop state and not to automatically determine progress failure. Classification no. The trimmer APC in 3 is a case where the laser field of view overlaps the preceding material when changing the trim position when the width of the preceding material and the succeeding material are different (Fig. 6). Even in this case, it is possible to perform mask processing by recognizing the automatic position adjustment of the trimmer, and not to automatically determine progress failure. Classification no. 4, signal hunting is a phenomenon in which noise is mixed in the output of the non-contact rangefinder 7 due to vibrations during operation. The time (On time) during which this hunting continues to exceed the threshold h is 0.5 s at maximum, whereas the time (On time) during which the actual trim scraps do not progress properly exceeds the threshold h is at least 1.05 s. is. Therefore, noise can be eliminated by setting an ON delay timer in an arbitrary range of 0.6 s or more and less than 1.05 s (turning on the timer input and then turning on the output after the set time has elapsed). It is possible to properly detect a progress failure. In addition, classification No. Of 4, the TE bounce can be processed in the same manner as the signal hunting because the time (On time) during which the tail tip bounce continues to exceed the threshold value h is 0.55 s at maximum. In order to stop the line early after the abnormality is detected, it is preferable that the ON time is short.

In other words, when the line is stopped or during APC, the logic that does not detect the poor progress of trim waste by mask processing is provided, and the ON delay timer exceeding the threshold value is provided for signal hunting and rebound of TE to prevent poor progress of trim waste. can be detected correctly.

FIG. 7 shows a block diagram of the trim scrap detection device according to the present embodiment including the control system. In the example of FIG. 7, a computer 18 having a mask function and an ON delay timer function is placed in the electrical room 130, and data collected by the non-contact rangefinder 7 as a trim scrap height detection sensor installed in the production line 110 is sent to the interface 17. is sent to computer 18 through . Then, it is sent to the result collection system 21 by real-time transmission DT. When the computer 18 determines that the trim scrap 3 is inadequately advanced 30, (1) it sends a stop signal ST to the drive device 20 including the hydraulic motor and the motor to command a line stop 31; Bit transmission of the alarm signal AL to the alarm device 19 with revolving light and transmission of abnormality 19A to the operator are executed, or both. As described above, the present embodiment has a function to automatically stop the line when it detects that the trim scrap is not progressing properly. becomes.

The effect of shortening the removal work was an average of 5.56 minutes/time before the measures were taken, but after the measures were shortened to 2.0 minutes/time, resulting in a total operating rate improvement effect equivalent to 1.2 hours/month. rice field. In addition, the yield was improved by 190 tons/month as an effect of reducing scratches caused by trim waste.

According to the trim scrap detection device and the trim scrap detection method of the present invention, it is possible to detect shearing abnormalities and progress failures of trim scrap at an early stage with high accuracy, and it is possible to suppress the stoppage time of the line, so that the yield is improved and it is industrially useful. is.

1 Metal strip (steel plate)
2 Trimmer 3 Trim scrap 4 Induction guide 5 Chopper 6 Chopper scrap 7 Trim scrap height detection sensor (non-contact rangefinder)
8 Projected light 9 Reflected light 10 Chute lid 11 Trim waste holder 12 Chopper waste layer height detection sensor 13 Contact type metal detector 14 Trim waste height detection sensor visual field 15 Data logger 16 Video camera 17 Interface between sensor and computer 18 Mask Calculator with function/ON delay timer function 19 Warning device with revolving light 19A Abnormal transmission 20 Drive device including hydraulic pressure and motor 21 Results collection system 30 Occurrence of poor progress of trim waste 31 Line stop 110 Production line 120 Operation room 130 Electric room F Traveling direction AL Warning signal (Bit transmission)
DT Real-time transmission ST Stop signal

Claims (10)

Equipment having guides for guiding sheared trim scraps to a step of shredding or winding them when shearing and removing both width direction ends of the metal strip along the longitudinal direction of the metal strip by a trimmer, wherein the trim scraps are removed. A device for detecting,
A non-contact rangefinder is installed so that the entire width direction of the guide can be seen from above, and the presence or absence of trim chips in the guide and the height of the trim chips are always detected, and abnormal shearing of the trimmer or advance of trim chips is detected. A trim waste detection device having a function of judging defects. 2. The method according to claim 1, having a function of avoiding an erroneous detection and determining that the trim scrap is not progressing properly when the height of the trim scrap detected is equal to or higher than an arbitrarily specified threshold value. Trim waste detector. 3. The trim scrap detector according to claim 2, further comprising at least one of an automatic line stop function and an alarm output function when it is determined that the trim scrap is not advancing properly. 4. A trim scrap detector according to claim 2 or 3, comprising an ON-delay timer making it possible to avoid false detections due to noise in the signal or abrupt fluctuations in trim scrap. Trim scrap detection device according to any one of claims 2 to 4, having a mask function making it possible to avoid erroneous detection during line stoppages or trimmer position adjustments. 2. The guide according to claim 1, having a function of determining that there is shearing abnormality due to meandering of the metal strip within a line when it is detected that there is no trim scrap in the guide installed at one end of the width direction of the metal strip. Trim waste detector. A method for detecting trim scraps in a guide that guides sheared trim scraps to a step of shredding or winding up when trimmers are used to shear and remove both ends of a metal strip in the width direction along the longitudinal direction of the metal strip. hand,
Using a non-contact rangefinder installed on the downstream side of the trimmer, the full width direction of the guide is kept in the field of view from above, and the presence or absence of trim scrap in the guide and the height of the trim scrap are constantly detected, A trim scrap detection method for determining trimmer shear anomalies or trim scrap advancement failures. When the height of the detected trim scrap exceeds an arbitrarily specified threshold value, it is determined that the trim scrap is not progressing properly after avoiding erroneous detection, and at least automatic line stop and alarm output are performed. 8. The trim waste detection method of claim 7, wherein one is performed. Using the ON delay timer to avoid false detections due to signal noise or sharp fluctuations in trim debris, and using the mask function to avoid false detections during line stoppages or trimmer position adjustments. 9. The method of detecting trim waste according to claim 8, wherein at least one of the steps is performed. 8. The detection of trim waste according to claim 7, wherein when it is detected that there is no trim waste in the guide installed at one end in the width direction of the metal strip, it is determined that there is shearing abnormality due to meandering of the metal strip within a line. Method.

Images