JP4248670B2 - Metal strip inspection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a metal band inspection apparatus implemented in a continuous line in which a metal band such as a steel plate is welded and connected, continuously processed by a processing facility, and sheared to obtain a metal band coil product.
[0002]
[Prior art]
In such a continuous line, a metal strip is welded by a welding machine at the entry side of an annealing furnace, a plating facility or a pickling facility, and continuously fed into the treatment facility, and at the exit side of the treatment facility, a shearing machine is used. To obtain a coil product. In the prior art, a weld indication hole, which is a through-hole for displaying the weld, is drilled near the weld where the metal strip is welded, and the travel position of the weld indication hole is measured and the travel length of the metal strip is measured. And detecting a welding indication hole between the outlet side of the processing equipment and the shearing machine within a predetermined range before and after the detected traveling position, and a metal band including the welding indication hole and the welded portion. A portion of the crop called a crop is sheared away. In the prior art, the operator visually confirms whether or not welding indication holes and welds are mixed in the coil product. If winding has occurred, the welding indication is displayed from the coil in the subsequent refining process. The portion of the metal band including the hole and the weld is removed, thus preventing the welded coil from flowing out.
[0003]
In such a prior art, when not only a welding indication hole but also a pinhole is present in the metal band, the pinhole is detected to shear the metal band by a shearing machine, thereby welding the coil product. The display hole and the welded part may be caught. In addition, it is necessary for an operator to visually check whether or not weld indication holes and welds are mixed in the coil product. In particular, the plate thickness of the preceding material and the following material is thin, and the values are the same. In some cases, it is difficult to determine whether or not the foreign material is mixed, and it is easy to overlook such mixing, which causes the welded portion coil to flow out.
[0004]
[Problems to be solved by the invention]
It is an object of the present invention to automatically inspect whether or not a welded portion of a metal strip and a weld indication hole are wound on a metal strip coil product in a continuous line that continuously processes the metal strip. An object of the present invention is to provide a metal band inspection apparatus.
[0005]
[Means for Solving the Problems]
A welding machine that welds and connects metal strips in the longitudinal direction;
A drilling machine provided in the vicinity of the welding machine and forming a welding indication hole in the vicinity of the welded portion of the metal strip;
Processing equipment for processing metal strips;
A welding display hole detecting means arranged on the downstream side of the processing equipment for detecting the welding display hole;
A shearing machine arranged on the most downstream side to shear the metal strip;
Traveling position detecting means for detecting the traveling position of the metal strip;
A metal strip that includes a welding indication hole and a welded portion by shearing at a predetermined position E1, E2 before and after the welding indication hole in response to outputs from the welding indication hole detecting means and the traveling position detecting means. A continuous line metal strip inspection apparatus including a shear control means PLC for removing a part of CR, S of
Position setting means for setting positions PL01 and PL02 shifted by predetermined lengths D1 and D2 before and after the length L0 from the punch to the welding display hole detecting means;
In response to the outputs of the welding display hole detecting means, the traveling position detecting means, and the position setting means, within a range of positions PL01 to PL02 detected by the traveling position detecting means corresponding to the predetermined lengths D1 and D2, Counting means for counting the number N of detection by the welding display hole detecting means;
In response to the output of the counting means, seen containing a judgment means for count value N to determine whether they match the number N1 the predetermined weld display aperture,
The determination means has a memory for storing the travel position detected by the travel position detection means corresponding to the detection output of the weld display hole detection means within the predetermined lengths D1 and D2 before and after the weld display hole. Have
After multiple shearing operations by the shearing machine, the running position stored in the memory is
When one or more portions CR of the metal strip to be removed by the shearing operation, to determine whether present in the _S, further running position that is stored in the memory there are a plurality, most running direction of the metal strip It is a metal band inspection device that determines whether or not the downstream and uppermost travel positions PL1 and PLN are present in one or more portions CR and S of the metal band to be removed by a shearing operation. .
[0006]
According to the present invention, the tail end of the preceding material and the leading end of the succeeding material are welded by the welding machine, and a welding display hole is formed by the drilling machine near the welded portion. On the exit side of the processing facility, the weld indication hole is detected by the welding indication hole detection means, and the shearing machine shears one or more portions of the metal strip such as a crop and a sample including the weld indication hole and the weld. Divide and remove from coil products. The traveling position detection means may be provided at other locations such as the metal strip processing device exit side or entry side.
[0007]
The shear control means shears the metal band in response to the outputs of the welding display hole detection means and the traveling position detection means so that the portions CR and S of the metal band can be removed. In this way, a metal band coil product in which the metal band is treated is obtained.
[0008]
According to the present invention, the position setting means sets positions PL01 and PL02 that are shifted by predetermined lengths D1 and D2 before and after the length L0 from the drilling machine to the welding display hole detection means. The predetermined lengths D1 and D2 may be the same value or may be different from each other, for example, 10 m. The traveling position detection means always detects the traveling position of the welding display hole. Within the range of positions PL01 to PL02, the number N of the weld display holes detected by the weld display hole detection means, and further the pin holes and the like is counted. The determining means determines whether or not the count value N counted by the counting means is equal to a predetermined number N1 of welding display holes, for example, 1. Thus, it is possible to determine whether or not there is a welding indication hole and a welded portion in a portion where the metal band is sheared and removed by the shearing machine, and the coil product has not been wound. .
[0009]
The travel position detecting means includes a roller that contacts the surface of the metal band, for example, and may cause a measurement error. Even if such a measurement error exists, the traveling display position detection means is within the range of the positions PL01 and PL02. Since the detection output of the detection means is counted, the detection of the welding display hole is reliable.
The memory stores the travel positions of the holes detected by the welding display hole detecting means within the ranges PL01 to PL02 of the lengths D1 and D2 before and after the weld display holes of the metal strip. It is judged by the judging means whether or not the position exists in the metal strip portions CR and S to be removed after the metal strip shearing operation is completed. In this way, it is possible to determine whether or not the weld indication hole and the welded portion are wound around the metal band coil product after the shearing is completed. This determination result can also be displayed in the same manner as described above in a plurality of display modes by the display means described above. Further, when a plurality of holes are detected by the welding display hole detecting means within the ranges PL01 to PL02 of the predetermined lengths D1 and D2, the most upstream and downstream downstream travel positions PL1 and PLN are taken by a shearing operation. It is judged whether or not it exists in the portions CR and S of the metal strip to be removed. As a result, whether or not the winding coil has flowed out can be determined with the simplest possible operation.
[0010]
The present invention also includes display means for performing display in at least three types of display modes,
The judging means is a display means,
When the count value N coincides with the predetermined number N1, the count value N is a predetermined value in the first display mode indicating that the welded display hole and the welded portion are not normally wound on the metal band coil product. When the number N1 exceeds the predetermined number N1, in the second display mode, which indicates that there is a possibility that a welding display hole may be wound into the metal band coil product,
When the count value N is less than the predetermined number N1, the display operation is performed in the third display mode indicating that the welding display hole is wound in the metal band coil product.
[0011]
According to the present invention, the display means displays the determination results of the determination means in a plurality of types, for example, three types of display modes as in the embodiments described later. If the number N of holes detected by the welding display hole detecting means within the range of travel positions PL01 to PL02 of the metal band matches the predetermined number N1 of the welding display holes, the metal band including the welding display holes is included. A part of is removed by being sheared by a shearing machine, and it is displayed in the first display mode that the metal strip coil product is a normal one that does not involve the weld display hole and the weld. When the count value N exceeds N1, in addition to the welding indication hole, a hole such as a pinhole is also detected by the welding indication hole detecting means. In the second display mode, it is displayed that there is a possibility that the welding indication hole may be wound around the metal band coil product by performing erroneous shearing by the shearing.
[0012]
When the count value N is less than N1, the weld display hole is present outside PL01 to PL02, and displays that the weld display hole is wound around the metal strip coil product in the third display mode. These first to third display modes are different from each other. For example, in the first display mode, the display lamp as the display means is turned off, in the second display mode, the display lamp blinks, and in the third display mode, the display lamp is kept lit. In another embodiment of the present invention, the first to third display modes may be realized by an indicator lamp whose display color changes, or may be configured such that the count value N is visually displayed. Further, the display may be performed in a plurality of other different display modes, and may be further displayed by sound or the like.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention. The preceding material 1a and the following material 1b, which are steel plates, are welded by a welding machine 3, and a welding display hole 5 (see FIG. 2 described below) is drilled by a drilling machine 4 to be formed. The processing facility 2 may be, for example, an annealing furnace, a plating facility, or a pickling facility. A bridle roll 45 is provided on the exit side of the processing facility 2. Reference numerals 1a and 1b may be collectively indicated by reference numeral 1. The metal strip 1 travels in the traveling direction 29. The trailing material 1 b is shown as a supply coil of reference numeral 17. Travel position detecting means 6 is attached to the bridle roll 45. The traveling position detecting means 6 measures the traveling length of the metal strip 1 by generating a pulse at every predetermined rotation angle of the bridle roll wound around the metal strip 1 and counting the generated pulses. Therefore, the traveling position of the metal strip 1 can be detected. The traveling position detection means 6 may be provided not only on the exit side of the processing equipment 2 but also on the entry side as long as it is upstream of the shearing machine 11.
[0016]
The welding display hole detecting means 7 includes a light source 8 such as an elongated fluorescent lamp arranged over the entire length of the metal strip 1 in the width direction (perpendicular to the paper surface of FIG. 1), the welding display hole 5 through the light source 8, and other parts. And a line image sensor 9 that receives light through a hole such as a pinhole, and detects a hole such as a welding display hole 5 that extends over the entire width of the metal strip 1. The metal band sheared by the shearing machine 11 is wound up as a metal band product coil 12.
[0017]
The process computer 14 that is a judgment means controls the operation information and production information in the line to the programmable controller 13 that is a shear control means PLC that directly controls the operations of the welding machine 3, the drilling machine 4, the shearing machine 11, and the like. The inspection of the metal band 1 is performed based on the detection output of the hole obtained from the programmable controller 13 and the welding display hole detection means 7 and the shear signal, and the result is displayed on the display means 35. The process computer 14 is connected to an input means 15 such as a keyboard as a position setting means and a memory 16.
[0018]
FIG. 2 is a diagram showing the preceding material 1a and the following material 1b in a simplified manner. The tail end 18 of the preceding material 1 a and the tip 19 of the succeeding material 1 b are welded by the welding portion 21 by the welding machine 3. The drilling machine 4 forms a welding display hole 5 in the vicinity of the welded portion 21. The drilling machine 4 is arranged very close to the welding machine 3. After the metal strip 1 has been processed by the processing equipment 2, the shearing machine 11 shears at the shear locations 22, 23, thus a portion CR that may be referred to as a crop of the metal strip 1 including the weld indication hole 5 and the weld 21. Is obtained. This portion CR is removed from the metal strip product coil 12.
[0019]
Furthermore, it is sheared at the position 25 by the shearing machine 11, and the portion S of the metal strip 1 to be a sample is obtained. The welding display hole 5 is formed at the center position in the width direction of the metal strip 1. The most downstream end of the metal strip product coil 12 in the traveling direction, that is, the tip is indicated by reference numeral 28, and the length A from the tip 28 to the shearing position 22 is the length of the traveling position detecting means 6 during the shearing operation by the shearing machine 11. It can be detected by the output. The length B from the tip 28 of the metal strip product coil 12 to the welding display hole 5 can be detected by the output of the traveling position detection means 6 in the welding display hole detection means 7 and the shearing operation of the shearing machine 11. Furthermore, the length B1 from the tip position 28 to the hole 27 and the length C from the shear position 25 can be obtained in the same manner. These lengths A, B, B1, and C are stored in the memory 16.
[0020]
FIG. 3 is a diagram showing a correspondence relationship between each length along the traveling direction of the metal strip 1 in the continuous line of the embodiment of the present invention shown in FIG. 1 and the detected position of the traveling position detecting means 6. The length from the drilling machine 4 to the welding display hole detecting means 7 is L0. The detection value of the welding display hole detecting means 6 corresponding to this length L0 is PL0. The length between the welding display hole detecting means 7 and the shearing machine 11 is L1. The distance L0 may be, for example, 300 m to 3 km.
[0021]
Positions PL01 and PL02 shifted by predetermined lengths D1 and D2 before and after the length L0 are set by the input means 15. The positions PL01 and PL02 are values detected by the traveling position detection means 6, and the lengths D1 and D2 may be 10 m, for example, or may be different from each other. When the detected values of the travel position detecting means 6 corresponding to the lengths D1 and D2 are ΔP1 and ΔP2, the positions PL01 and PL02 are expressed as follows.
PL01 = PL0 + ΔP1 (1)
PL02 = PL0−ΔP2 (2)
[0022]
Similarly, positions PL03 and PL04 shifted by predetermined lengths D3 and D4 are set before and after the length L0. The lengths D3 and D4 may be, for example, D3 = D4 = 5 m, and the lengths D3 and D4 may be different from each other.
PL03 = PL0 + ΔP3 (3)
PL04 = PL0−ΔP4 (4)
[0023]
The values ΔP3 and ΔP4 in the equations 3 and 4 are values detected by the traveling position detection means 6 corresponding to the lengths D3 and D4.
[0024]
When the metal strip 1 is sheared by the shearing machine 11, the shearing machine 11 performs a shearing operation at the position QL1 traveled by the travel distance E3 after the welding display hole 5 is detected by the detection means 7. As a result, as shown in FIG. 2, the preceding material 1 a is sheared at a position 22 at a distance E <b> 1 downstream from the welding display hole 5. The value of the travel position detecting means 6 corresponding to the length E3 is indicated by the reference symbol QL1. The length E3 is 9 m, for example.
L1 = E1 + E3 (5)
[0025]
The shearing position 23 in FIG. 2 has a length E <b> 2 upstream from the welding display hole 5. FIG. 4 is a diagram showing a state in which the metal strip 1 travels and passes through the welding display hole detecting means 7 over the lengths D1 and D2. While the metal strip 1 is stopped and welded and connected by the welding machine 3, and after the welding display hole 5 is formed by the drilling machine 4, the metal strip 1 is started to travel, and the travel position detecting means 6 is The traveling position of the metal strip 1 is detected. Although the tracking point corresponding to the detected value PL02 is indicated by reference numeral 31 due to the error of the traveling position detecting means 6 as shown in FIG. 4A, the actual welding display hole 5 is indicated by a black circle 32. Further, it is assumed that the hole 27 such as a pinhole is at the position of the white circle 33. When the metal strip 1 further travels and the detection value PL01 is obtained by the travel position detection means 6, the movement is completed as shown in FIG. 4 (2). During this time, all the holes in the range between D1 and D2 before and after the tracking point are detected and stored in the memory 16. In the present invention, it is determined whether or not the welding display hole 5 and the hole 27 exist in the portions CR and S where the metal strip 1 is removed, regardless of the detection error of the traveling position detection means 6.
[0026]
FIG. 5 is a flowchart for explaining the operation of the process computer 14. The preceding material 1a and the succeeding material 1b are welded and connected by the welding machine 3 as described above, the welding display hole 5 is formed by the drilling machine 4, and then the metal strip 1 is run. In step a2, the detection value PL corresponding to the travel length of the travel position detection means 6 is read at every time interval ΔW1 (for example, 200 m / sec), and whether or not the detection value PL is equal to or greater than the value PL02 (PL ≧ PL02). Therefore, it is determined whether or not the tracking point 31 has reached the distance D2 based on the detection value of the traveling position detection means 6 before (upstream side) the welding display hole detection means 7. If this determination is affirmative, in the next step a3, it is determined whether the detected value PL exceeds the value PL01 (PL> PL01). If this judgment is negative, the welding indication hole detecting means 7 detects the welding indication hole 5 and the hole 27 (these holes are collectively indicated by the reference symbol Pi) at step a4, and every time the hole Pi is detected, the hole is detected. Pi is counted by the counting means. In the next step a5, the detection value PLi obtained by the traveling position detection means 6 of the hole Pi is detected and stored in the memory 16 together with the count value of the hole Pi.
[0027]
FIG. 6 is a diagram showing a part of the stored contents of the memory 16. The position PLi for each hole Pi detected in steps a4 to a5 and the count value i of the hole Pi in the range PL01 to PL02 are stored correspondingly. The hole Pi is the above-described weld display hole 5, the hole 27, or the like. In the embodiment shown in FIG. 6, the memory 16 indicates that a total of N holes have been detected.
[0028]
If it is determined in step a3 in FIG. 5 that the detected value PL detected by the travel position detecting means 6 has exceeded the value PL01, in step a6, is the count value N equal to a predetermined value N1? (N = N1) is determined. If so, the process proceeds to step a7, where it is determined to be normal. The predetermined number N1 is the number of welding display holes 5 formed for each welded portion 21 as described above, and is 1 (N1 = 1) in this embodiment, for example. If the determination in step a6 is negative, the process proceeds to step a8.
[0029]
When it is determined in step a8 that N> N1, that is, when the count value N exceeds a predetermined number N1, there is a possibility that the welding indication hole 5 may be wound around the metal strip product coil 12. Determination is made at step a9. Further, when the count value N is less than the predetermined number N1, it is determined in step a10 that the weld display hole 5 is wound around the metal strip product coil 12.
[0030]
In step a11, based on the determination results in steps a7, a9, and a10, the display lamp which is the display means 35 is displayed. When it is determined as normal as in step a7, the display means 35 remains off as the first display mode. When it is determined that there is a possibility of involving the welding display hole as in step a9, the display means 35 is blinked and displayed as the second display mode. When it is determined that the welding display hole 5 is entrained as in step a10, the display means 35 is maintained in the lit state as the third display mode.
[0031]
FIG. 7 is a flowchart for explaining the operation of the programmable controller 13. In step b2, the detection result of the travel position detection means 6 is received at a predetermined time interval ΔW2 (for example, 100 msec <ΔW2), and the detection value PL detected by the travel position detection means 6 is equal to or greater than a predetermined value PL04 (PL ≧ PL04). ) Is determined. If this determination is affirmative, the process proceeds to step b3. In step b3, it is determined whether the detection value PL of the traveling position detection means 6 exceeds a predetermined value PL03 (PL> PL03). Otherwise, the process proceeds to step b4. In step b4, it is determined whether or not the welding indication hole 5 or the hole 27 is detected by the welding indication hole detection means 7. When the hole 5 or 27 is detected, the detected hole is the welding indication hole 5. It judges that it is a thing and moves to step b5. In step b5, from the time when the welding display hole 5 is detected by the welding display hole detection means 7, the metal strip 1 is made to travel by the detection value QL1 corresponding to the length E3. Therefore, in step b6, the shearing machine 11 is sheared according to the shearing conditions stored in the memory 16. The shearing conditions are the number of portions CR and S of the metal strip 1 to be removed and the lengths E1, E2, and C shown in FIG. 2, and the lengths corresponding to the shearing positions 22, 23 and 25, Therefore, this is a value representing the position to be detected by the traveling position detection means 6. Thus, the portions CR and S of the metal strip 1 are obtained by shearing in step b7, and these portions CR and S are removed.
[0032]
FIG. 8 is a flowchart for explaining the operation of the process computer 14. When the shearing operation is completed by the shearing machine 11, the process proceeds to step c2 and the stored contents of the memory 16 are read out. As shown in FIG. 2, the content read from the memory 16 includes a length A corresponding to the shear position 22 downstream in the traveling direction and the most upstream shear position 25 among the plurality of shear positions 22, 23, 25. The positions of the corresponding length C and the positions PL1 to PLN (generally indicated as PLi) of the detected holes 5 and 27 stored in the memory 16 are also shown. The position PLi to be read may be only the position PL1 on the most downstream side in the traveling direction and the position PLN on the most upstream side.
[0033]
In step c3, it is determined whether or not the most downstream position PL1 of the read hole 5 or 27 is within the range of lengths A and C (A ≦ PL1 ≦ C). If so, the next step c4 is performed. Move on. In step c4, it is determined whether or not the detected position PLN of the hole 27 in the most upstream in the traveling direction is in the range of the above-described positions A and C (A ≦ PLN ≦ C). If so, all the holes are determined in step c5. 5 and 27 are determined to exist in the portions CR and S to be removed, and are determined to be normal. When the positions PL1 and PLN of the holes do not exist in the above-described positions A and C, it is determined in step c6 that the welding display hole may be wound around the product coil 12 and the winding has occurred. . Thus, in step c7, the series of operations is completed.
[0034]
The present invention can be widely implemented not only for inspection of steel plates but also for metal strips made of other metal materials.
[0035]
【The invention's effect】
According to the first aspect of the present invention, it is possible to automatically inspect whether or not the weld indication hole of the metal strip and the welded portion are wound on the metal strip coil product. Therefore, it is possible to reduce the load on the operator who has been visually confirmed from the past, and to ensure the inspection. Therefore, it is possible to find the welded portion mixed coil without overlooking, and to remove the welded indication hole and the welded portion from the metal band coil product in which the welded indication hole and the welded portion are wound. Can be reliably performed, and foreign material outflow can be eliminated.
Further, after the metal strip is sheared, it is determined whether or not the detected traveling position of the hole including the weld indication hole stored in the memory exists in CR and S of the metal strip portion to be removed. Thus, it is possible to automatically inspect for the presence or absence of a welded portion mixed coil. In addition, since only the most upstream and most downstream traveling positions PL1 and PLN of the detected traveling positions of the holes such as the welded display holes are detected in the metal strip portions CR and S to be removed, it is detected. It is not necessary to perform a determination operation after detecting all the plurality of holes detected in the predetermined ranges PL01 to PL02, and the calculation can be simplified.
[0036]
According to the second aspect of the present invention, the display means is normal that the welding display hole and the welded portion are not involved, that there is a possibility that the display means is involved, and that the inclusion is involved. Since each display operation is performed in the third display mode, it is not necessary to inspect a normal metal strip coil product, the load on the operator can be reduced, and the outflow of different materials can be reliably eliminated.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention.
FIG. 2 is a simplified diagram showing a leading material 1a and a trailing material 1b.
3 is a diagram showing a correspondence relationship between each distance along the traveling direction of the metal strip 1 and the detection position of the traveling position detection means 6 in the continuous line of the embodiment of the present invention shown in FIG. 1;
FIG. 4 is a diagram showing a state in which the metal strip 1 travels and passes through the welding display hole detecting means 7 over the lengths D1 and D2.
FIG. 5 is a flowchart for explaining the operation of a process computer 14;
6 is a diagram showing a part of the contents stored in a memory 16. FIG.
FIG. 7 is a flowchart for explaining the operation of the programmable controller 13;
FIG. 8 is a flowchart for explaining the operation of the process computer 14;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Metal strip 1a Preceding material 1b Subsequent material 2 Processing equipment 3 Welding machine 4 Punching machine 5 Welding display hole 6 Traveling position detection means 7 Welding display hole detection means 11 Shear machine 12 Metal band product coil 13 Programmable controller 14 Process computer 15 Input Means 16 Memory 17 Supply coils 22, 23, 25 Shear position CR, S Metal band 1 part

Claims (2)

A welding machine that welds and connects metal strips in the longitudinal direction;
A drilling machine provided in the vicinity of the welding machine and forming a welding indication hole in the vicinity of the welded portion of the metal strip;
Processing equipment for processing metal strips;
A welding display hole detecting means arranged on the downstream side of the processing equipment for detecting the welding display hole;
A shearing machine arranged on the most downstream side to shear the metal strip;
Traveling position detecting means for detecting the traveling position of the metal strip;
A metal strip that includes a welding indication hole and a welded portion by shearing at a predetermined position E1, E2 before and after the welding indication hole in response to outputs from the welding indication hole detecting means and the traveling position detecting means. A continuous line metal strip inspection apparatus including a shear control means PLC for removing a part of CR, S of
Position setting means for setting positions PL01 and PL02 shifted by predetermined lengths D1 and D2 before and after the length L0 from the punch to the welding display hole detecting means;
In response to the outputs of the welding display hole detecting means, the traveling position detecting means, and the position setting means, within a range of positions PL01 to PL02 detected by the traveling position detecting means corresponding to the predetermined lengths D1 and D2, Counting means for counting the number N of detection by the welding display hole detecting means;
In response to the output of the counting means, seen containing a judgment means for count value N to determine whether they match the number N1 the predetermined weld display aperture,
The determination means has a memory for storing the travel position detected by the travel position detection means corresponding to the detection output of the weld display hole detection means within the predetermined lengths D1 and D2 before and after the weld display hole. Have
After multiple shearing operations by the shearing machine, the running position stored in the memory is
When one or more portions CR of the metal strip to be removed by the shearing operation, to determine whether present in the _S, further running position that is stored in the memory there are a plurality, most running direction of the metal strip A metal band inspection apparatus for determining whether or not the downstream and uppermost travel positions PL1 and PLN are present in one or more portions CR and S of a metal band to be removed by a shearing operation . Including display means for displaying in at least three types of display modes;
The judging means is a display means,
When the count value N coincides with the predetermined number N1, in the first display mode indicating that the welded hole and the welded portion are not normally wound on the metal band coil product,
When the count value N exceeds the predetermined number N1, the second display mode indicates that there is a possibility that a welding display hole may be wound into the metal band coil product.
2. When the count value N is less than the predetermined number N1, a display operation is performed in each of the third display modes indicating that a welding display hole is wound in the metal band coil product. The metal strip inspection device described.

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