JP2002243665A - X-ray foreign-body detection apparatus and method of detecting defective in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray foreign-body detection apparatus, with which the abnormality of the number of latches in a specimen equipped with a latch to be detected as a foreign body can be detected, with which the foreign body at the inside of the specimen can be detected and which can enhance the detection accuracy of defectives. SOLUTION: A defect determining part 17c in a defect detecting part 17 divides a development image into a front area E1 and a rear area E2 on the basis of the length of the specimen, and the number of foreign bodies in the respective areas E1, E2 is detected. If the specimen is ham or sausage, one each of a clip as the foreign body is detected in the respective areas E1, E2. When the number of clips is 0 or when two or more clips are detected, the number of clips is determined as being abnormal. A mask-region setting part 17a sets a mask region in the position of the clip, and the foreign body inside the specimen excluding the clip is detected. When the foreign body is detected or when the number of clips is abnormal, the specimen is determined to be a defective and is output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to raw meat, fish,
The present invention relates to an X-ray foreign matter detection device that detects foreign matter in an inspected object from the amount of X-rays transmitted to the inspected object of each type, such as processed foods and pharmaceuticals, when the X-ray is irradiated. The present invention relates to an X-ray foreign matter detection device capable of accurately detecting a defective product by the presence or absence of a fastener as an attached foreign material, and a defective product detection method in the device.

[0002]

2. Description of the Related Art X-ray foreign matter detectors irradiate X-rays to inspected objects (raw meat, fish, processed foods, pharmaceuticals, etc.) of various varieties which are sequentially conveyed on a conveyance line, and are irradiated with the X-rays. This is a device that detects whether or not a foreign substance such as metal, glass, stone, bone, or the like is mixed in the inspection object from the amount of transmitted X-rays.

FIG. 9 is a perspective view showing a conventional X-ray foreign matter detecting device of this kind. As shown in the figure, an X-ray generator 51 is provided at an intermediate position where the inspection object W is transported on the conveyor 50,
The X-ray detectors 52 are arranged to face each other. The X-ray generator 51 irradiates X-rays to the inspection object W being conveyed, and the X-ray detector 52 generates an electric signal (X) corresponding to the amount of X-rays transmitted through the inspection object W.
Line transmission data). The processing means (not shown) determines the presence or absence of foreign matter based on the amount of transmitted X-rays.

FIG. 10 is a diagram showing an inspection object W. In the illustrated example, the inspection object W is ham, sausage, or the like,
At both ends, a state having metal clips S is displayed. Normally, in the inspection object W such as ham and sausage, a clip S for stopping is provided at each of both ends (two in total) in order to maintain a stored state. If such an inspection object W is simply X-ray inspected, the clip S is detected as a foreign substance, and the apparatus cannot be operated.

For this reason, a special kind of inspection object W to which the clip S determined as such a foreign substance is attached is attached.
In the X-ray foreign matter detection device that inspects the object, the foreign matter is detected only inside the inspected object W except for the clips S at both ends of the inspected object W during the process of determining the presence or absence of foreign matter in the inspected object W. It has become.

[0006] The defective product is determined by image processing. As shown in the figure, the image processing unit includes a mask area M of a predetermined range at a coordinate axis position assuming both end positions of the inspection object W.
Is set in advance, so that the clip S detected in the mask area M is not recognized as a foreign substance.

[0007]

However, in the conventional defective product determination process, it is possible to detect the presence / absence of foreign matter inside the inspection object W, but it is possible to detect the presence / absence of the clip S attached to the inspection object W. Did not. If the clip S is not attached to the inspection object W, it is clear that the inspection object W is a defective product, but conventionally, this defective product could not be detected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can detect an abnormality in the number of fasteners of a test object having a fastener which is detected as a foreign substance and detection of a foreign substance inside the test object. An object of the present invention is to provide an X-ray foreign matter detection device capable of improving the detection accuracy of a defective product and a method of detecting a defective product in the device.

[0009]

In order to achieve the above-mentioned object, an X-ray foreign matter detection apparatus according to the present invention provides an X-ray inspection apparatus for detecting X-rays on a test object (W) provided with a fastener (S) which is detected as foreign matter. An X-ray foreign matter detection device (1) for detecting the presence or absence of a foreign matter in the inspection object from the amount of X-ray transmitted through the inspection object with the irradiation of the X-ray; On the developed image of the inspection object, each area is divided into a plurality of areas including the positions of the fasteners of the inspection object, and the number of fasteners to be detected as foreign matter in each of the divided areas. And a failure determination unit (17c) that determines that the inspected object is normal only when the numbers match, and that the number of fasteners is abnormal when the numbers do not match.

Further, a mask area (M) which is provided at the position of the fastener of the inspection object and which is excluded from the foreign matter detection area is set on the developed image of the inspection object based on the X-ray transmission amount. A mask area setting unit (17a) and an inspection object image extraction unit (17b) for extracting only the inspection object as an extraction image in order to detect foreign matter in an area other than the mask area set on the inspection object The defect determination unit (17c) is for determining the number of the fasteners and individually detecting the presence or absence of foreign matter inside the inspection object (W). The inspection object may be determined to be defective based on the case where a foreign substance is detected on the surface or when the number of fasteners is abnormal.

The object to be inspected (W) is packaged in a package, and both ends in the longitudinal direction are fasteners (S1, S2).
The defect determination unit (17c) sets an area (E1, E2) that is divided into two in the length direction according to the shape of the inspection object. The number of fasteners in the area may be compared with a preset number to determine that the inspected object is normal only when they match, and that when the numbers do not match, the number of fasteners is abnormal.

The defect judging section (17c) sets auxiliary areas (E11, E21) in outer areas adjacent to the respective areas (E1, E2), and determines the number of the fasteners (S). The configuration may be such that the number of fasteners is determined to be abnormal even when a foreign object is detected in the auxiliary area.

According to the X-ray foreign matter detection method of the present invention, an X-ray is irradiated onto an inspection object (W) provided with a fastener (S) which is detected as a foreign matter. In the X-ray foreign matter detection method for detecting the presence or absence of foreign matter in the inspection object from the transmission amount of X-rays transmitted through the inspection object, each area on the developed image of the inspection object is A step of dividing the area into a plurality of areas including the positions of the fasteners of the inspection object, a step of comparing the number of fasteners to be detected as foreign matter in each of the divided areas with a preset number, and matching the comparison results. The inspection object is normal only at the time, and when the number does not match, the number of fasteners is abnormal and the inspection object is determined to be defective.

According to the above configuration, the developed image of the inspection object W is divided into a plurality of areas E1 and E2 so as to include the position of the fastener S of the inspection object W. Each divided area E
1 and E2 are provided with a specified number of fasteners S, respectively.
Detected as foreign matter. Then, the number of the fasteners S actually detected as foreign matters is compared with a preset number, and only when the numbers match, the inspection object is determined to be normal. When the number of detected foreign objects does not match the set number, such as less than or more than the set number, it is determined that the number of fasteners is abnormal.

[0015]

FIG. 1 is a perspective view showing the external appearance of an X-ray foreign matter detecting device. The X-ray foreign matter detection device 1 is provided in a part of a transport line, and detects the presence or absence of foreign matter mixed in the inspection object W (including the surface) sequentially transported at a predetermined interval. In the X-ray foreign matter detection device 1, a transport unit 3 and a foreign matter detection unit 4 are provided inside a device main body 1a.
Is provided on the upper front surface of the apparatus main body 1a.

The transport unit 3 includes, for example, raw meat, fish, processed food,
The test object W of each kind such as a medicine is transported. The test object W in this embodiment is a ham, a sausage, or the like, and the end of the package (vinyl sheet) is fastened with a fastener (clip) S. Stopping means that the packaged state of the contents is maintained. Hereinafter, in this embodiment, an example in which the inspection object W is a bar-shaped sausage and one metal fastener S that does not transmit X-rays is provided at each end (two in total) will be described. . The clip S is made of metal or plastic, and is made of a material that is detected as a foreign substance in normal X-ray detection.

The transport section 3 is composed of a belt conveyor arranged horizontally with respect to the apparatus main body 1a. The transport unit 3
The inspection object W carried in from the carry-in port 3a at a predetermined transfer speed set in advance by the drive of the drive motor 6 is transferred to the carry-out port 3b.
(The transport direction X in the figure). At this time, the inspection object W is transported such that the length direction coincides with the transport direction X. That is, the clip S is transported so as to be positioned before and after in the transport direction.

The foreign matter detector 4 detects foreign matter along the transport path of the inspection object W to be transported, and includes an X-ray generator 8 provided at a predetermined height above the transporter 3 and a transporter. 3 is provided with an X-ray detector 9 provided opposite to the X-ray generator 8.

The X-ray generator 8 has a configuration in which a cylindrical X-ray tube 12 provided inside a metal box 11 is immersed in insulating oil (not shown). Is irradiated on the anode target to generate X-rays.
The longitudinal direction of the X-ray tube 12 is the transport direction X of the inspection object W.
It is provided in a direction (Y direction) orthogonal to. X-ray tube 1
The X-rays generated by 2 are emitted toward a lower X-ray detector 9 in a substantially triangular screen shape by slits (not shown) along the longitudinal direction.

The X-ray detector 9 detects X-rays transmitted through the inspection object W when the inspection object W is irradiated with the X-rays, and detects the transmitted amount of the detected X-rays. Output an electrical signal corresponding to. The X-ray detector 9 is provided along a Y direction orthogonal to the transport direction X of the inspection object W transported on the transport unit 3. As the X-ray detector 9, an array-type line sensor including a plurality of photodiodes arranged in a line and a scintillator provided on the photodiodes is used.

In the X-ray detector 9 having such a configuration,
When an X-ray is emitted from the X-ray generator 8 to the inspection object W, the X-ray transmitted through the inspection object W is received by a scintillator and converted into light. Further, the light converted by the scintillator is received by a photodiode disposed below the scintillator. Each photodiode converts the received light into an electric signal and outputs the electric signal. This X-ray detector 9
Outputs to the processing means 13 an electric signal having a level corresponding to the intensity of the received X-ray.

FIG. 2 is a block diagram showing an electrical configuration of the apparatus. The processing means 13 includes a CPU and the like, a memory and the like, and receives X-ray transmission data from the X-ray detector 9. The X-ray transmission data is A / D converted by an A / D converter (not shown), and then stored in the data memory 14. The data memory 14 stores at least the 640 pieces of X-ray transmission data per line (Y direction) in the transport direction X of the inspection object W to be transported (front end Wa to rear end W).
b corresponding to a predetermined number of lines (for example, 4
80 lines). The processing unit 13 performs an inspection process on the inspection object W for foreign matter contamination based on the data.

The transport unit 3 is provided with a position detector 10 such as a light emitting / receiving sensor for detecting the inspection object W. Processing means 13
Receives the output of the position detector 10 and uses the output at the time when the tip of the inspection object W shields the light emitting and receiving position as a start trigger, and the shielding period is the length of the inspection object W (the detection period). ), And stores each inspection object W in the data memory 14.
X-ray transmission data of a unit is taken in.

Inspection processing is performed by checking whether foreign matter such as metal, glass, stone, bone, etc. is mixed in the inspection object W based on an electric signal corresponding to the transmission level of the X-ray transmitted through the inspection object W. It determines whether or not. As a basic principle, when a state in which X-rays are not transmitted due to foreign matter occurs, that is, when the value of the amount of X-ray transmission is low, it is determined that foreign matter is mixed, and a selection signal or the like is output to the outside. The image data obtained by directly developing the input data into an image is displayed on the display unit 15 of the display 7 via the image processing unit 16.
Output to

The processing means 13 performs image processing by the image processing section 16 so as to prevent the clip S attached to the inspection object W from being erroneously recognized as a foreign substance at the time of the above-described defective product determining processing due to the inclusion of the foreign substance. I have. The defect detection unit 17 does not detect the clip S as a foreign substance and determines whether or not the specified number of clips S are attached to the inspection object W. The defect detection unit 17 is one function related to image processing in the image processing unit 16.

The failure detecting section 17 has a mask area setting section 17a, an inspection object extracting section 17b, and a failure determining section 17c. In the mask area setting unit 17a, a mask area M having a predetermined range at the coordinate axis position of the clip S on the X-ray transmission image of the inspection object W is set.

FIG. 3 is a diagram showing the mask area M. As shown in the drawing, the mask area M is set with a predetermined range on a predetermined coordinate axis position of the inspection object W with respect to the inspection object W. The inspection object W is image-developed with the signal input timing of the start trigger whose leading end blocks the position detector 10 during the transport of the transport unit 3 as the reference position RF. Also for the mask area M, the reference position R of the X-ray transmission image of the inspection object W
F is set as a reference, and is set to have predetermined ranges xL, yL on the coordinate axis positions x1, y1 and x2, y2, respectively, which are set in synchronization with the start trigger signal input. The set mask area M has a predetermined number of pixels (number of dots) n.

The inspected object extraction unit 17b determines the X of the inspected object W excluding the mask area M for determining foreign matter inside the inspected object W.
A line transmission image is extracted as an extraction image A. The clip S, which is a foreign substance, is located in the mask area M, and the extracted image A does not include the clip S. Thus, the extracted image A
By the above-described processing based on the amount of X-ray transmission in, it is possible to detect a foreign substance only inside the sausage which is a contained object. Although not shown in detail, the developed X-ray transmission image displayed on the display unit 15 or the like has a different display density according to the amount of X-ray transmission. Further, the original developed image before the mask processing is output to the defect determining unit 17c for detecting the number of clips S described later.

The defect determining unit 17c stores, as preset values, a length L of the inspection object W and a predetermined number n of clips S. Then, based on the amount of X-ray transmission of the inspection object W, a defective product is determined based on whether or not the number n of the clips S is the specified number.

FIG. 4 is a diagram for explaining the processing contents when a clip is detected. More specifically, as shown in the drawing, a length L / 2 obtained by dividing the length L of the inspection object W into two equal parts is obtained, and the image of the inspection object W slightly exceeds L / 2 from the center of the two divisions. Counting is performed while scanning the number of clips S (that is, the number of locations where a low X-ray transmission amount corresponding to foreign matter is obtained) on the images in the range (front area E1, rear area E2). Each of the front area E1 and the rear area E2 has a range exceeding L / 2 from the center of the object W to be inspected.
1, E21.

If the counted number of clips is the specified number n, it is determined to be normal, and if the counted number is less than or larger than the specified number n, it is determined to be defective. In the example of the sausage, it is determined that the image is normal only when the clips S1 and S2 are detected one by one on each of the two divided screens.

Next, the X-ray foreign substance detecting operation according to the above configuration will be described. In the X-ray foreign matter detection device 1 configured as described above, when the inspection object W is carried in from the carry-in entrance 3a of the transport unit 3, the X-ray generator 8 sends the inspection object W to the inspection object W in the transportation process. Is exposed. X-rays that pass through the inspection object W with the X-ray exposure are detected by the X-ray detector 9.

Then, the processing means 13 determines whether or not foreign matter has entered the inspection object W based on the electric signal corresponding to the amount of transmission of the X-rays detected by the X-ray detector 9,
From this determination result, a selection signal indicating a non-defective or defective product is output to the outside. Specifically, when the X-ray transmission amount of the inspection object W in the range excluding the mask region M where the clip S exists is equal to or less than the threshold set for detecting foreign matter, it is determined that foreign matter has been mixed. Then, the inspection object W that has completed the inspection is sorted into non-defective products and defective products according to the sorting signal output from the processing unit 13.

The image processing section 16 of the processing means 13
Image data indicating the amount of X-ray transmission output from the X-ray detector 9 is displayed and output on the display unit 15. It is possible to confirm the state of the external shape of the inspected object W as viewed on a plane and the degree of transmission of X-rays within the inspected object W, and the display density of the foreign matter portion differs from the others (higher or different from the surroundings). ) Can be displayed. "OK", "N
G ”, and the inspection results of the total number of inspections, the number of non-defective products, and the total number of NGs are displayed.

Here, the processing means 13 compares the data stored in the data memory 14 with a reference value, and determines that the data exceeding the reference value is NG if any one of the lines includes the data. Strictly, when the X-ray transmission amount is lower than the reference value (when X-rays are not transmitted due to foreign matter), it is determined to be NG, and when the X-ray transmission amount is higher than the reference value, OK is determined.
Is determined, "NG" or "OK" is displayed.

Next, the operation of detecting a defective product (detection of the number of clips) in the above configuration will be described. FIG. 5 is a flowchart showing the defective product detection processing. Prior to the foreign matter detection operation, or in parallel with the foreign matter detection operation, the defect determination unit 17c detects a defective product as to whether the inspection object W has a specified number of clips S attached thereto. The processing unit 13 makes a final defective determination based on the presence or absence of foreign matter in the inspection object W and the detection of coincidence of the specified number of clips S.

The length L of the inspection object W and the number n of the clips S are set as the above set values in the defect judging section 17c (S1). In the case of sausage, it is set as n = 1 (one for forward and backward). As described above, the image processing unit 16 develops the X-ray transmission data output from the X-ray detection unit 9 as an X-ray transmission image of the inspection object, and the defect determination unit 17c captures this image ( S2).
Then, a clip recognition process is performed based on the captured developed image of the inspection object W (S3).

First, based on the length L, the developed image of the inspection object W is divided into two front and rear portions along the transport direction. At this time, the clip is individually recognized as a front area up to a range slightly beyond L / 2 in the transport direction based on the reference position RF as a front area, and a rear area up to a range slightly beyond L / 2 thereafter. The reference position RF is the time when the position detector 10 detects the head position of the inspection object W as described above, and corresponds to the position of the head (one end) of the inspection object W in the X-ray transmission image.

Next, the defect judging section 17c judges the position and determines whether or not the clip S in these two front and rear areas E1 and E2.
Are detected (S4). First, the process is executed by designating the front area E1 (S4-front area). The number of locations corresponding to the X-ray transmission level of the clip S in the range of the front area E1 is counted (S
5). Here, since the clip S is made of metal, a level corresponding to foreign matter detection is detected as the clip S. More specifically, the developed image is scanned, and a group of pixels corresponding to the foreign matter detection level (the amount of X-ray transmission is small) is determined as one clip S1 in the front area E1, and the count is 1 increase.

Next, it is determined whether or not the count number in the front area E1 matches the clip number n (S).
7). In the flowchart, it is described that the process proceeds to S2 after the end of S5 and the same processing is executed in the rear area. In the position determination (S4), the vehicle branches to the rear area E2 (S4-rear area) by ending the front area E1, and (S6--) by ending the detection processing in the front area E1.
Yes), a forward determination is made (S7). In this forward determination, since the set number of clips n = 1, if the count number in the front area E1 matches this n = 1, the number of clips S in the front area E2 is the specified number and is determined to be normal. I do. Therefore, the count number is 0 or 2
In the case above, it is determined that the number of clips S is abnormal.

Thereafter, also in the rear area E2, the number of clips S is counted in the same manner as in the processing in the front area E1 (S8). It is determined whether or not the number matches the number of clips n (S9), and the process ends.

FIG. 6 is a view showing the inspection object W in various states. As shown in FIG. 6A, if one clip S is detected in each of the areas E1 and E2 before and after the inspection object W, it is determined that the number of clips in the inspection object W is normal. That is, normality is determined in each of the processes S7 and S9, and is output to the processing unit 13 as there is no defect regarding the number of clips S. The processing means 13 determines a defective product based on the result of the presence / absence of foreign matter in the inspection object W using the mask area M and the number of the clips S. As described above, if the number of clips S is normal, if there is no foreign substance, it is determined and output as a normal product.

On the other hand, in FIGS. 6B to 6G, the inspected object W is determined to be defective. In the state shown in FIG. 6B, since the number of clips S in the front area E1 is 0, it does not match the set value n = 1 and is determined to be defective. In this case, it is possible to determine and output that the clip S in front of the inspection object W is missing. In the case of sausage, if one of the clips S is missing, it is obvious that the clip is defective.

In the state shown in FIG. 6C, the rear area E
Since the number of clips S at 2 is 0, it does not match the set value n = 1 and is determined to be defective. In this case, it is possible to determine and output that the clip S behind the inspection object W is missing.

In the state shown in FIG. 6D, the front area E
The number of clips S at 1 is 1, and it matches the set value n = 1, so that the front area E1 is determined to be normal. However, since the number of clips S in the rear area E2 is 2, the detection state in the auxiliary area E21 is determined. This auxiliary area E2
When the clip S3 is detected in step 1, it is determined to be defective. In this state, although the clips S1 and S2 are attached one by one to the front and back of the inspection object W itself, the clip S3 of another defective inspection object Wn in a cut state is detected in the auxiliary area E21. Based on that. The defective non-inspection object Wn may occur as a defective product in a manufacturing process, and this defective product can be detected.

In the state shown in FIG.
The number of clips S at 1 is 1, and it matches the set value n = 1, so that the front area E1 is determined to be normal. The number of clips S in the rear area E2 is one. However, the clip S2 within the range of L / 2 based on the length of the inspection object W
Is not detected and is 0. Also, one clip S3 is detected in the auxiliary area E21. In this state, although one clip S1 is attached only to the front of the inspection object W itself, there is no rear clip S2, and further, another defective inspection object Wn in the cut state is simultaneously detected. It can happen if detected.

In the state shown in FIG.
1, the number of clips S is 2, and the rear area E
2, no clip S2 is detected, and none of them matches the set value n = 1. Since the number of clips S is 2 in the front area E1, the detection state in the auxiliary area E11 is determined. When the clip S0 is detected in the auxiliary area E11, it is determined that the clip is defective.

In the state shown in FIG. 6G, the rear area E
Although the number of clips S2 in 2 is 1, the number of clips S in the front area E1 is 2 and does not match the set value n = 1. Since the number of clips S is 2 in the front area E1, the detection state in the auxiliary area E11 is determined. When the clip S0 is detected in the auxiliary area E11, it is determined that the clip is defective.

As in the above examples, the number of clips S on a single inspection object W is not limited to the number of clips S, and other clips S near the target inspection object W may be determined based on the binding failure of the clip S or the like.
Even when (S0, S3) is detected, it is determined that there is some defect in the manufacturing process or the like. Accordingly, a strict defective product inspection can be performed, and the reliability of the inspection object W determined as a normal product can be improved.

In the above setting, the description has been made using an example of a kind (sausage) in which one clip S is provided on each side of one inspection object W, but one inspection object W
Even in the case of a type having two or more clips S provided on both sides thereof, the determination is made in consideration of the length of the inspection object W, so that defective products in each state can be accurately determined in the same manner as described above. Can be determined.

In the above embodiment, the position of the tip end of the inspection object W in the transport direction is detected by the position detector 10 and the reference position RF is detected.
Was obtained. However, the present invention is not limited thereto, and the reference position RF may be set by detecting the leading end position of the inspection object W based on a change in the amount of X-ray transmission during image processing scanning by the image processing unit 16. A clip S is provided at this tip position, and since the amount of X-ray transmission before and after is significantly different, the clip S
Can be detected. In this case, the position detector 10 is unnecessary.

Next, FIG. 7 is a diagram showing another example of a product type. The inspection object W shown in the figure is a package in which the above-mentioned sausage is further packaged in a single package T in units of a plurality (four in the example shown). In the case of such an inspection object W, a plurality of mask regions M are individually set in the mask region M for detecting foreign matter in accordance with the arrangement position of the clips S of each inspection object W in the package T. Then, foreign substances can be detected in the same manner as described above. If there is room for each inspection object W to move back and forth (shift) in the transport direction inside the package T, the mask area M is increased along the transport direction in advance corresponding to this margin. Is also good.

On the other hand, the same applies to the detection of the number of clips S. As shown in the figure, defective products may be detected in the area divided into two parts before and after the length of the package T. In the illustrated example, the number of clips is n = 4. If four clips S are detected in each of the front area E1 and the rear area E2, it is normal.
Alternatively, when five or more pieces are detected, it is determined that the product (inspection object W) of the package T is defective.

FIG. 8 shows the inspection object W described above.
It is a figure showing the state where the conveyance direction of (sausage) differs. As illustrated, the inspection object W may be transported so as to be orthogonal to the transport direction X. In this case, the reference position RF of each inspection object W is detected by the position detector 10 based on the side portion of the inspection object W, and the same as described above based on the developed image captured by the image processing unit 16. The reference position RF can be set for one of the clips S, and the mask position M for detecting foreign matter, the length L for detecting the number of clips, and the areas E1 and E2 can also be set. For convenience, the developed image is 9
It is the same as rotating by 0 degrees and performing the same processing as above.

[0055]

According to the present invention, the number of fasteners can be accurately detected even for a test object having a fastener which is detected as a foreign substance, and the reliability of defective product detection of the test object is improved. it can. In addition, it is possible to set a mask area to detect foreign matter in a portion other than the fastener of the inspection object.
By determining the number of the fasteners, a defective product to be inspected can be detected more accurately. Varieties of ham, sausage, and the like using such fasteners are not able to be shipped as defective because the number of fasteners is abnormal and the packaging state is obviously poor. As a result, the effect of improving the production efficiency can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external appearance of an X-ray foreign matter detection device according to the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the X-ray foreign matter detection device according to the present invention.

FIG. 3 is a view showing a mask region.

FIG. 4 is a diagram showing an area for clip recognition.

FIG. 5 is a flowchart showing a defective product detection process.

FIG. 6 is a view showing various states of an inspection object.

FIG. 7 is a diagram showing another packaging form of the inspection object.

FIG. 8 is a diagram showing another detection state of the inspection object.

FIG. 9 is a perspective view showing a configuration of an X-ray foreign matter detection device.

FIG. 10 is a diagram showing an inspection object provided with a clip.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... X-ray foreign substance detection device, 3 ... conveyance part, 8 ... X-ray generator,
9: X-ray detection unit, 13: processing means, 16: image processing unit,
17: defect detection unit, 17a: mask area setting unit, 17b
... Inspection object extraction unit, 17c Failure determination unit, E1 front area, E2 rear area, E11, E21 auxiliary area, M mask area, W inspection object.

Continued on the front page F term (reference) 2G001 AA01 BA11 CA01 DA01 DA02 DA08 FA01 FA06 GA07 HA13 JA09 JA13 JA16 KA03 KA05 LA01 LA02 PA03 PA11 4B042 AC10 AD01 AD03 AE03 AP08 AT04 AT05

Claims (5)

[Claims] An X-ray is irradiated on an inspection object (W) provided with a fastener (S) detected as a foreign substance, and the X-ray is transmitted through the inspection object with the X-ray exposure. In an X-ray foreign matter detection device (1) for detecting the presence or absence of foreign matter in the inspection object from the amount of transmitted X-rays, each area on the developed image of the inspection object is Divide the area into multiple including the position of the fastener,
The number of fasteners to be detected as a foreign substance in each of the divided areas is compared with a preset number, and the inspection object is normal only when they match, and when the numbers do not match, the number of fasteners is determined to be abnormal. (17c), an X-ray foreign matter detector. 2. A mask area (M) which is provided at a position of a fastener of the inspection object on the developed image of the inspection object and is excluded from a foreign substance detection area based on the amount of X-ray transmission. A mask area setting unit (17a) and an inspection object image extraction unit (17b) for extracting only the inspection object as an extraction image in order to detect foreign matter in an area other than the mask area set on the inspection object And the defect determination unit (1)
7c) is for judging the number of the fasteners and individually detecting the presence or absence of foreign matter in the inspection object (W). If foreign matter is detected in the extracted image not including the mask area, or 2. The X-ray foreign matter detection device according to claim 1, wherein the inspection object is determined to be defective based on any of the abnormalities of the number of the fasteners. 3. The object to be inspected (W) has a substantially rod-like shape whose contents are wrapped in a package and both ends in the length direction are fastened by fasteners (S1, S2). The determining unit (17c) sets areas (E1, E2) divided into two in the length direction corresponding to the shape of the inspection object, and compares the number of fasteners in each area with a preset number to match. The X-ray foreign matter detection device according to any one of claims 1 and 2, wherein the inspection object is normal only when the inspection is performed, and the number of fasteners is determined to be abnormal when the inspection objects do not match. 4. The defect determining section (17c) sets auxiliary areas (E11, E21) in outer areas adjacent to the respective areas (E1, E2), and determines the number of the fasteners (S). The X-ray foreign matter detection device according to any one of claims 1 to 3, wherein the number of fasteners is determined to be abnormal even when foreign matter is detected in the auxiliary area. 5. An X-ray is irradiated onto an inspection object (W) provided with a fastener (S) detected as a foreign substance, and the X-ray is transmitted through the inspection object along with the X-ray exposure. In the X-ray foreign matter detection method for detecting the presence or absence of foreign matter in the inspection object from the amount of transmitted X-rays, each area on the image after development of the inspection object is a position of a fastener of the inspection object. And a step of comparing the number of fasteners to be detected as foreign substances in each of the divided areas with a preset number, and determining that the inspection object is normal only when the comparison results match. And a step of judging that the inspected object is defective because the number of fasteners is abnormal when there is a mismatch.