JP2000301211A - Device for inspecting metallic strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically inspect whether welding indicating holes and weld zone are incorporated by rolling in the product coil of the metallic strip or not. SOLUTION: The metallic strips 1 are welded with a welding machine 3, punched in the vicinity of the weld zone with a punching machine 4 and the welding indicating holes are detected on the outlet side of a treating equipment 2 with detecting means 7. The strip is sheared with a shearing machine 11, made into the product coil 12 of the metallic strip and also parts OR, S including the welding indicating holes and weld zone are sheared and removed. Positions PL01, PL02 where are shifted by lengths D1, D2 are set before and behind the length L0 from the punching machine 4 to the detecting means 7 and the number N of the holes including the welding indicating holes which are detected within this range PL01-PL02 are counted. It is judged that, when the count value N is the predetermined number 1 of the welding indicating holes, the coil is normal, in the case of N>N1, there is possibility of the generation of a coil in which the weld zone is incorporated and, in the case of N<N1, the coil in which the weld zone is incorporated is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting a metal strip which is welded and connected to a metal strip such as a steel plate, continuously processed by a processing facility, and sheared to obtain a metal strip coil product. .

[0002]

2. Description of the Related Art In such a continuous line, a metal strip is welded by a welding machine at an input side of a processing facility such as an annealing furnace, a plating facility or a pickling facility, and the metal strip is continuously charged into the processing facility. On the side, it is sheared by a shearing machine and split to form a coil product. In the prior art, a welding indicator hole, which is a through hole for displaying a welded portion, is drilled near a welded portion where a metal strip is welded, and a travel position of the weld indicator hole is measured, and a travel length of the metal strip is measured. The welding indication hole is detected between the outlet side of the processing equipment and the shearing machine within a predetermined range before and after the detected traveling position, and the metal strip including the welding indication hole and the welded portion is detected. A portion called a crop is removed by shearing. In the prior art, whether or not welding indication holes and welds are entrained and mixed in the coil product is visually checked by an operator, and if entrainment occurs, a welding indication is displayed from the coil in a subsequent refining process. Portions of the metal strip, including holes and welds, have been removed, thus preventing the outflow of the weld entrained coils.

In such prior art, when not only a weld indication hole but also a pinhole is present in a metal strip, the pinhole is detected, and the metal strip is sheared by a shearing machine, thereby performing coil winding. The welding indication hole and the welded part may be involved in the product. In addition, it requires a lot of labor to visually confirm whether or not welding indication holes and welds are mixed in coil products.
In particular, when the sheet thickness of the preceding material and the succeeding material is thin and has the same value, it is difficult to judge the presence or absence of the mixing of the different materials in appearance, and it is easy to overlook such mixing, which results in welding. The part mixing coil flows out.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to determine whether or not a welded portion of a metal strip and a welding indication hole have been caught in a metal strip coil product in a continuous line for continuously processing a metal strip. An object of the present invention is to provide a metal strip inspection device capable of performing an inspection automatically.

[0005]

According to the present invention, there is provided a welding machine for welding a metal strip in a longitudinal direction thereof and connecting the metal strip and a welding indication hole provided near the welding machine and formed near a welded portion of the metal strip. Drilling machine, processing equipment for processing the metal strip, welding indication hole detecting means arranged downstream of the processing equipment and detecting the welding indication hole, and shearing arranged at the most downstream side to shear the metal strip Machine, a traveling position detecting means for detecting a traveling position of the metal strip, and predetermined positions E before and after the welding indicating hole in response to outputs of the welding indication hole detecting means and the traveling position detecting means.
1 and E2, a continuous line metal band inspection apparatus including a shear control means PLC for removing a part CR and S of a metal band including a welding indication hole and a weld by shearing with a shearing machine. Position PL0 shifted by predetermined lengths D1 and D2 before and after length L0 up to the display hole detecting means.
1, the position setting means for setting PL02, the welding display hole detecting means, the traveling position detecting means, and the traveling position detecting means responding to the respective outputs of the position setting means, and are detected by the traveling position detecting means corresponding to the predetermined lengths D1, D2. Range of positions PL01 to
Within PL02, counting means for counting the number N of detections by the welding indication hole detecting means, and in response to the output of the counting means, determine whether or not the count value N matches the predetermined number N1 of welding indication holes. A metal band inspection device comprising: a determination unit.

According to the present invention, the tail end of the preceding material and the leading end of the following material are welded by a welding machine, and a welding indicator hole is formed near the welded portion by a drilling machine. At the exit side of the processing equipment, the welding indicator hole is detected by the welding indicator hole detecting means, and the shearing machine shears one or more portions of the metal strip such as the crop and the sample including the welding indicator hole and the weld. Cut and remove from coil products. The traveling position detecting means may be provided at another place such as the exit side or the entrance side of the processing device of the metal strip.

In response to the outputs of the welding indication hole detecting means and the traveling position detecting means, the shear control means shears the metal strip so that the portions CR and S of the metal strip can be removed. In this way, a metal strip coil product in which the metal strip is treated is obtained.

According to the present invention, the position setting means is provided at positions PL01 and PL02 shifted by predetermined lengths D1 and D2 before and after the length L0 from the drilling machine to the welding indication hole detecting means.
Set. The predetermined lengths D1 and D2 may be the same value or different values from each other, and may be set to, for example, 10 m. The traveling position detecting means is
The running position of the welding indication hole is always detected. Within the position range PL01 to PL02, the number N of the welding indication holes detected by the welding indication hole detecting means and the number of holes such as pinholes are counted. The determining means determines that the count value N counted by the counting means is a predetermined number N1 of welding indication holes,
For example, it is determined whether it is equal to 1. By this, the part where the metal band was sheared and removed by the shearing machine,
Before the shearing, it can be determined whether or not the welding indication hole and the welding portion exist and the coil product has not been entangled.

The running position detecting means includes a roller which comes into contact with, for example, the surface of the metal strip, and may cause a measurement error.
Since the detection output of the welding display hole detecting means is counted within the range of 01, PL02, the detection of the welding display hole is reliable.

Further, the present invention includes a display means for displaying in at least three kinds of display modes, and the judging means sets the display means to a metal strip coil when the count value N matches the predetermined number N1. In a first display mode indicating that the welding indication hole and the welded portion are not involved in the product, when the count value N exceeds the predetermined number N1, the welding indication hole is wound around the metal strip coil product. In the second display mode indicating that there is a possibility that the welding indication hole is wound around the metal strip coil product when the count value N is less than the predetermined number N1, The display operation is performed.

According to the present invention, the display means displays the results of the judgment by the judging means in a plurality of types, for example, three types of display modes as in the embodiments described later. If the number N of the holes detected by the welding indication hole detecting means matches the predetermined number N1 of the welding indication holes in the range PL01 to PL02 of the traveling position of the metal strip, the metal strip including the welding indication holes is provided. Is sheared by the shearing machine and removed, and the metal strip coil product is displayed in a first display mode as being normal without the welding indication hole and the welded portion. When the count value N exceeds N1, besides the welding indication hole,
Holes such as pinholes are also detected by the welding indication hole detecting means, so it is impossible to determine which welding indication hole the welding indication hole is, and erroneous shearing is performed by subsequent shearing,
The fact that there is a possibility that the welding indication hole may be involved in the metal strip coil product is displayed in the second display mode.

When the counted value N is less than N1, the welding indication hole exists outside of PL01 to PL02, and the fact that the welding indication hole is wound around the metal strip coil product is displayed in a third display mode. . These first to third display modes are different from each other. For example, in the first display mode, the indicator light as the display means is turned off, and in the second display mode, the indicator light blinks,
In the third display mode, the indicator lamp is kept lit.
In another embodiment of the present invention, the first to third display modes include:
The display color may be realized by a display lamp that changes, or the count value N may be configured to be visually displayed, and further, the display is performed in a plurality of other mutually different display modes. Alternatively, it may be displayed by sound or the like.

In the present invention, the judging means is detected by the traveling position detecting means corresponding to the detection output of the welding indicating hole detecting means within the range of the predetermined lengths D1 and D2 before and after the welding indicating hole. Having a memory for storing the travel position, after a plurality of shearing operations by the shears, the traveling position stored in the memory is stored in one or more parts CR, S of the metal strip to be removed by the shearing operation. It is determined whether or not there are a plurality of traveling positions stored in the memory. If there are a plurality of traveling positions stored in the memory, the traveling positions PL1 and PLN at the most downstream and the most upstream in the traveling direction of the metal band are removed by the shearing operation. One or more parts CR of the band,
It is characterized in that it is determined whether it exists in S.

According to the present invention, the memory has a range PL01 to PL2 of lengths D1 and D2 before and after the welding indication hole of the metal strip.
In 02, the travel position of the hole detected by the welding indication hole detection means is stored, and the stored travel position is stored in the metal strip portions CR and S to be removed after the completion of the shearing operation of the metal strip. It is determined by the determination means whether or not it exists. Thus, after the completion of the shearing, it can be determined whether or not the welding indication hole and the welded portion are involved in the metal strip coil product. This determination result can be displayed in a plurality of display modes in the same manner as described above by the above-mentioned display means. The predetermined length D
When a plurality of holes are detected by the welding indication hole detecting means in the ranges PL01 to PL02 of D1, D2, the most upstream and most downstream traveling positions PL1, PLN are portions of the metal strip to be removed by the shearing operation. It is determined whether it exists in CR and S. Thus, it is possible to determine whether or not the outflow of the winding coil has occurred by a calculation operation as simple as possible.

[0015]

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 the welding machine 3 and formed by drilling a welding indication hole 5 (see FIG. 2 described below) by the drilling machine 4. The processing equipment 2 may be, for example, an annealing furnace, plating equipment, or pickling equipment. A bridle roll 45 is provided on the exit side of the processing equipment 2. Reference numerals 1a and 1b may be collectively indicated by reference numeral 1. The metal strip 1 runs in the running direction 29. Trailing material 1
b is shown as the supply coil 17. The traveling position detecting means 6 is attached to the bridle roll 45. The running position detecting means 6 generates a pulse at each predetermined rotation angle of the bridle roll wound around the metal strip 1 and counts the generated pulses to measure the running length of the metal strip 1. Therefore, the traveling position of the metal strip 1 can be detected. The traveling position detecting means 6 may be provided not only on the exit side but also on the entrance side of the processing equipment 2 as long as it is on the upstream side of the shearing machine 11.

The welding indicator 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 plane of FIG. 1), and the welding indicator hole 5 through the light source 8. And a line image sensor 9 for receiving light passing through other holes such as pinholes, and detects holes such as the welding indication holes 5 over the entire width of the metal strip 1.
The metal band sheared by the shearing machine 11 is the metal band product coil 1.
Wound as 2.

The process computer 14 as a judgment means
Is a programmable controller 1 which is a shearing control means PLC which integrally controls operation information and production information in the line and directly controls the operations of the welding machine 3, the drilling machine 4, the shearing machine 11, and the like.
In addition to creating a command to the metal strip 3, the metal strip 1 is inspected based on a hole detection output and a shear signal obtained from the programmable controller 13, the welding indication hole detecting means 7, and the like, and the result is displayed on the display means 35. Input means 15 such as a keyboard as a position setting means and a memory 16 are connected to the process computer 14.

FIG. 2 is a diagram schematically showing the preceding material 1a and the following material 1b. The tail end 18 of the preceding material 1a and the following material 1
b is welded to the tip 19 at the welding portion 21 by the welding machine 3. The drilling machine 4 has a welding indication hole 5 near the welding portion 21.
To form 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 shears 11 shear at the shear locations 22, 23, thus a portion CR sometimes referred to as a crop of the metal strip 1 including the weld indicator hole 5 and the weld 21. Is obtained. This part CR is removed from the metal strip product coil 12.

Further, the sample is sheared at a position 25 by the shearing machine 11, and a portion S of the metal strip 1 serving as a sample is obtained. The welding indication 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 running direction, that is, the tip is indicated by reference numeral 28, and the length A from this tip 28 to the shearing position 22 is determined by the running 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 indication hole 5 is determined by the welding indication hole detecting means 7 and the shearing machine 1.
It can be detected by the output of the traveling position detecting means 6 in the first shearing operation. 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.

FIG. 3 is a diagram showing the correspondence between the length of the metal strip 1 along the running direction and the detected position of the running position detecting means 6 in the continuous line of the embodiment of the present invention shown in FIG. is there. The length from the punch 4 to the welding indication hole detecting means 7 is L0. The detected value of the welding display hole detecting means 6 corresponding to the length L0 is PL0. The length between the welding indication hole detecting means 7 and the shears 11 is L1. Distance L0
May be, for example, 300 m to 3 km.

Predetermined lengths D1 and D before and after the length L0
Positions PL01 and PL02 shifted by two are set by the input means 15. The positions PL01 and PL02 are values detected by the traveling position detecting means 6 and have a length D.
1 and D2 may be, for example, 10 m or different values. When the detection values of the traveling position detecting means 6 corresponding to the lengths D1 and D2 are ΔP1 and ΔP2,
Each position PL01, PL02 is represented as follows. PL01 = PL0 + ΔP1 (1) PL02 = PL0−ΔP2 (2)

Similarly, positions PL03 and PL04 shifted by predetermined lengths D3 and D4 before and after the length L0.
Is set. The lengths D3 and D4 are, 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)

Values ΔP3 and ΔP4 in Equations 3 and 4
Is a value detected by the traveling position detecting means 6 corresponding to the lengths D3 and D4.

When the metal strip 1 is sheared by the shearing device 11, the shearing device 11 detects the welding indication hole 5 by the detecting means 7 and then travels the position QL1 which has traveled the traveling distance E3.
Performs a shearing operation. As a result, as shown in FIG. 2, the preceding material 1a is sheared at the position 22 at a distance E1 downstream from the welding indication hole 5. The value of the traveling position detecting means 6 corresponding to the length E3 is indicated by reference numeral QL1. The length E3 is, for example, 9 m. L1 = E1 + E3 (5)

The shear position 23 in FIG. 2 has a length E2 upstream from the welding indication hole 5. FIG. 4 is a view showing a state in which the metal strip 1 travels and passes through the welding indication hole detecting means 7 over the lengths D1 and D2. In a state where the metal band 1 is stopped, the metal band 1 is welded and connected by the welding machine 3, and after the welding indicator hole 5 is formed by the drilling machine 4, the metal band 1 starts traveling, and the traveling position detecting means 6 The traveling position of the metal strip 1 is detected. As shown in FIG. 4A, the detection value PL02 due to an error of the traveling position detection means 6 or the like.
Although the tracking point corresponding to is indicated by reference numeral 31, the actual welding indication hole 5 is located at the position of the black circle 32, and the hole 27 such as the pinhole is located at the position of the white circle 33. When the metal strip 1 further travels and a detection value PL01 obtained by the travel position detecting means 6 is obtained,
The movement is completed as shown in FIG. During this time, all 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 indication holes 5 and the holes 27 are present in the portions CR and S where the metal strip 1 is removed irrespective of such a detection error of the traveling position detecting means 6.

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, and the welding indicator hole 5 is formed by the drilling machine 4, after which the metal strip 1 travels. In step a2, the detected value P corresponding to the traveling length of the traveling position detecting means 6
L is read out at every time interval ΔW1 (for example, 200 m / sec), and the detection value PL is greater than or equal to the value PL02 (PL ≧ PL
02), that is, whether the tracking point 31 has reached the distance D2 based on the detection value of the traveling position detecting means 6 just before (upstream) the welding display hole detecting means 7. If this determination is affirmative, in the next step a3, the detection value PL is set to the value PL01.
Is exceeded (PL> PL01). If this determination is negative, in step a4, the welding indication hole 5 and the hole 27 (these holes are collectively indicated by the reference numeral Pi) are detected by the welding indication hole detecting means 7, and each time the hole Pi is detected, the welding indication hole 5 and the hole 27 are detected. Pi is counted by the counting means. In the next step a5, a detection value PLi obtained by the traveling position detection means 6 of the hole Pi is detected, and together with the count value of the hole Pi,
Store in the memory 16.

FIG. 6 is a diagram showing a part of the contents stored in the memory 16. Each hole P detected in steps a4 to a5
The position PLi for each i and the count value i of the hole Pi in the range PL01 to PL02 are stored correspondingly. The holes Pi are the welding indication holes 5 and the holes 27 described above.
In the embodiment shown in FIG. 6, the memory 16 indicates that a total of N holes have been detected.

In step a3 of FIG. 5, the detected value PL detected by the traveling position detecting means 6 is the value PL01.
When it is determined that the count value N has been exceeded, in step a6, it is determined whether the count value N matches a predetermined value N1 (N = N1).
Is determined, and if so, the process proceeds to step a7 where it is determined that the data is normal. The predetermined number N1 is the number of welding indication holes 5 formed for each welding portion 21 as described above, and is, for example, 1 in this embodiment (N1 =
1). If the determination in step a6 is negative, the process proceeds to step a8.

When it is determined in step a8 that N> N1, that is, when the count value N is a predetermined number N
If it exceeds 1, it is determined in step a9 that there is a possibility that the welding indication hole 5 may be wound around the metal strip product coil 12. Further, when the count value N is less than the predetermined number N1, it is determined in step a10 that the welding indication hole 5 is wound around the metal strip product coil 12.

In step a11, steps a7, a
Based on the results of the determinations in steps 9 and a10, the display lamp as the display means 35 is displayed. When it is determined that the display is normal as in step a7, the display means 35 remains off as a first display mode. When it is determined that there is a possibility that the welding indication hole may be involved as in step a9, the display means 35 blinks as a second display mode. When it is determined that the welding indication hole 5 is involved as in step a10, the display means 35 is maintained in the lit state as the third display mode.

FIG. 7 shows the programmable controller 13.
5 is a flowchart for explaining the operation of FIG. In step b2, a predetermined time interval ΔW2 (for example, 10
0 msec <ΔW2), the detection result of the travel position detection means 6 is received, and the detection value PL detected by the travel position detection means 6 is equal to or greater than a predetermined value PL04 (PL ≧ PL0).
4) is determined. If this judgment is affirmative,
Move to step b3. In step b3, it is determined whether the detected value PL of the traveling position detecting means 6 has exceeded a predetermined value PL03 (PL> PL03). If not, the process proceeds to step b4. In step b4, it is determined whether the welding indication hole 5 or the hole 27 is detected by the welding indication hole detecting means 7, and when the hole 5 or 27 is detected, the detected hole is the welding indication hole 5. And the process proceeds to step b5. In step b5, the metal strip 1 is caused to travel by the detection value QL1 corresponding to the length E3 as the detection value of the traveling position detection means 6 from the time when the welding indication hole 5 is detected by the welding indication hole detection means 7. Therefore, in step b6, the shearing machine 11 is caused to perform a shearing operation according to the shearing conditions stored in the memory 16. The shearing conditions include the number of portions CR, S of the metal strip 1 to be removed, and the lengths E1, E2, C shown in FIG. 2, and the lengths corresponding to the shearing positions 22, 23, 25, Therefore, it is a value representing the position to be detected by the traveling position detecting means 6. In this way, the portions CR and S of the metal strip 1 are converted into steps
7 and these parts C
R and S will be removed.

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. The contents read from the memory 16 include a plurality of shear positions 2 as shown in FIG.
2, 23, 25, the most downstream shear position 22 in the running direction.
And the length C corresponding to the most upstream shear position 25, and the positions PL1 to PLN (collectively P1) of the detected holes 5, 27 stored in the memory 16.
Li). The position PLi to be read may be only the position PL1 at the most downstream in the traveling direction and the position PLN at the most upstream.

At 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 the lengths A and C (A ≦ PL1 ≦ C). Move to step c4. In step c4, the detection position PLN of the hole 27 at the uppermost stream in the traveling direction is set to the position A,
C (A ≦ PLN ≦ C), and if so, in step c5, all holes 5, 2
7 is determined to be present in the portion CR, S to be removed, and is determined to be normal. The position A,
If the positions PL1 and PLN of the holes do not exist in C, in step c6, there is a possibility that the welding indication hole has been entangled in the product coil 12, and it is determined that the entanglement has occurred. Thus, in step c7, a series of operations ends.

The present invention can be widely applied to inspection of not only steel plates but also metal bands made of other metal materials.

[0035]

According to the first aspect of the present invention, it is possible to automatically inspect whether or not a welding indicator hole and a welded portion of a metal strip are caught in a metal strip coil product. Therefore, it is possible to reduce the load on the operator who has been visually checking conventionally, and the inspection is surely performed. Accordingly, the welded coil can be reliably found without overlooking, and the work of removing such welded indication holes and welds from the metal strip coil product in which such welded indication holes and welds are involved is performed. Can be reliably performed, and the outflow of foreign materials can be eliminated.

According to the second aspect of the present invention, the display means comprises:
Since the welding indication hole and the welded portion are displayed as normal in the first to third display modes, the fact that the welding indication hole and the welded portion are normal, that there is a possibility of being involved, and that the welding portion is involved are displayed. It is not necessary to inspect a metal strip coil product, the load on the operator can be reduced, and the outflow of dissimilar materials can be reliably eliminated.

According to the third aspect of the present invention, after the metal band is sheared, the detected traveling position of the hole including the welding indication hole stored in the memory is determined by the CR, CR of the part of the metal band to be removed. It is determined whether or not the coil exists in S, and the inspection of the presence or absence of the coil mixed in the welding portion can be automatically performed. Also, only the most upstream and most downstream travel positions PL1 and PLN of the detected travel positions of the holes such as the welding indication holes are:
Since it is detected whether or not it exists within the portions CR and S of the metal strip to be removed, the predetermined range PL01 to P
The determination operation does not need to be performed after detecting all of the plurality of holes detected in L02, and the calculation can be simplified.

[Brief description of the drawings]

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

FIG. 2 is a diagram schematically illustrating a leading material 1a and a following material 1b.

FIG. 3 is a diagram showing a correspondence relationship between each distance along a traveling direction of a metal strip 1 and a detection position of a traveling position detecting means 6 in a continuous line of the embodiment of the present invention shown in FIG.

FIG. 4 shows a metal strip 1 having a welding indication hole detecting means 7 having a length D1,
It is a figure showing the state where it runs over D2 and passes.

FIG. 5 is a flowchart for explaining the operation of the process computer 14;

FIG. 6 is a diagram showing a part of contents stored in a memory 16;

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 Leading material 1b Trailing material 2 Processing equipment 3 Welding machine 4 Drilling machine 5 Welding indicator hole 6 Travel position detecting means 7 Welding indicator hole detecting means 11 Shearer 12 Metal strip product coil 13 Programmable controller 14 Process computer 15 Input Means 16 Memory 17 Supply coil 22, 23, 25 Shearing position CR, S Part of metal strip 1

Claims (3)

[Claims] 1. A welding machine for welding and connecting a metal strip in its longitudinal direction, a drilling machine provided near the welding machine and forming a welding indication hole near a welded portion of the metal strip; Processing equipment for processing; welding indication hole detecting means arranged downstream of the processing equipment and detecting a welding indication hole; a shearing machine arranged at the most downstream side for shearing the metal strip; and a traveling position of the metal strip. , A predetermined position E1, E2 before and after the welding indication hole in response to each output of the welding indication hole detecting means and the traveling position detecting means.
And a shearing control means PLC for shearing by a shearing machine to remove a part of the metal band CR and S including the welding indication hole and the welded portion.
In a metal strip inspection apparatus of a continuous line including: a position PL01, P which is shifted by a predetermined length D1, D2 before and after a length L0 from the drilling machine to the welding indication hole detecting means.
L02 is set in response to each output of the welding indication hole detecting means, the traveling position detecting means and the position setting means, and detected by the traveling position detecting means corresponding to the predetermined lengths D1 and D2. Counting means for counting the number N of detections by the welding indication hole detecting means within the position range PL01 to PL02; and responding to the output of the counting means, where the count value N matches the predetermined number N1 of welding indication holes. And a determining means for determining whether or not the metal strip is present. 2. A display device, comprising: display means for displaying in at least three types of display modes, wherein the determination means displays the display means when the count value N matches the predetermined number N1.
In a first display mode indicating that the welding indication hole and the welded portion are not wound around the metal strip coil product, the count value N
Is greater than the predetermined number N1, in a second display mode indicating that there is a possibility that a welding indication hole may be wound around the metal strip coil product, and when the count value N is less than the predetermined number N1, The metal strip inspection apparatus according to claim 1, wherein the display operation is performed in a third display mode indicating that the welding indication hole is wound around the metal strip coil product. 3. A travel position detected by travel position detection means corresponding to a detection output of the weld display hole detection means within a range of the predetermined lengths D1 and D2 before and after the weld display hole. Having a memory to store, after a plurality of shearing operations by the shears, whether the running position stored in the memory is in one or more parts CR, S of the metal strip to be removed by the shearing operation; When there are a plurality of traveling positions stored in the memory, the traveling position P at the most downstream and the most upstream in the traveling direction of the metal strip is determined.
3. The metal strip inspection device according to claim 1, wherein it is determined whether L1, PLN is present in one or more parts CR, S of the metal strip to be removed by a shearing operation.