JP3737950B2 - X-ray foreign object detection apparatus and defective product detection method in the apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, for example, X-ray foreign matter for detecting foreign matter in the inspection object from the amount of X-ray transmission when X-rays are irradiated to the inspection object of various varieties such as raw meat, fish, processed food, and medicine More particularly, the present invention relates to an X-ray foreign object detection device capable of accurately detecting a defective product based on the presence or absence of a fastener as a foreign material attached to an object to be inspected, and a defective product detection method in the device.
[0002]
[Prior art]
The X-ray foreign object detection device irradiates X-rays on various types of inspection objects (raw meat, fish, processed foods, medicines, etc.) that are sequentially transported on the transport line, and the amount of transmitted X-rays. This is a device that detects whether or not a foreign object such as metal, glass, stone, or bone is mixed in the inspection object.
[0003]
FIG. 9 is a perspective view showing a conventional X-ray foreign object detection apparatus of this type. As shown in the figure, an X-ray generator 51 and an X-ray detector 52 are arranged opposite to each other at a position on the conveyor 50 where the inspection object W is being conveyed. The X-ray generator 51 emits X-rays to the object W being transported, and the X-ray detector 52 is an electric signal (X-ray transmission data) corresponding to the amount of X-rays transmitted through the object W to be inspected. Is output. A processing means (not shown) determines the presence or absence of foreign matter based on the amount of X-ray transmission.
[0004]
FIG. 10 is a view showing the inspection object W. As shown in FIG. In the illustrated example, a state in which the inspection object W is ham, sausage, and the like and a metal clip S is displayed at both ends is displayed. Usually, in the inspected objects W such as ham and sausage, stop clips S are provided at both ends (two in total) in order to maintain the accommodation state. If such an object W is simply X-ray-inspected, the clip S is detected as a foreign object and the apparatus cannot be operated.
[0005]
For this reason, in the X-ray foreign object detection apparatus that inspects a special type of inspection object W to which the clip S determined as such a foreign object is attached, a process for determining whether or not foreign objects are mixed in the inspection object W Occasionally, the foreign matter detection only inside the inspection object W is performed except for the clips S at both ends of the inspection object W.
[0006]
This defective product determination is executed by image processing. As shown in the figure, a mask area M within a predetermined range is set in advance in the coordinate axis positions assuming both end positions of the inspection object W, and the clip S detected in the mask area M is not recognized as a foreign object. I am doing so.
[0007]
[Problems to be solved by the invention]
However, in the conventional defective product determination process, the presence / absence of foreign matter inside the inspection object W can be detected, but the presence / absence of attachment of the clip S to the inspection object W cannot be detected. If the clip S is not attached to the inspected object W, it is clear that the inspected object W is a defective product, but conventionally this defective product could not be detected.
[0008]
The present invention has been made in view of the above problems, and can detect an abnormality in the number of fasteners of an inspection object provided with a fastener that is detected as a foreign object and detection of a foreign object inside the inspection object. An object of the present invention is to provide an X-ray foreign object detection apparatus capable of improving detection accuracy and a defective product detection method in the apparatus.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the X-ray foreign object detection device of the present invention exposes an X-ray to an inspection object (W) provided with a fastener (S) that is detected as a foreign object, and exposes the X-ray. In the X-ray foreign object detection device (1) for detecting the presence or absence of a foreign substance in the inspection object from the amount of X-ray transmission that passes through the inspection object along with the radiation,
On the image after development of the inspection object, each area is divided into a plurality of areas each including the position of the inspection object fastener, and the number of fasteners to be detected as foreign objects in each of the divided areas A defect determination unit (17c) that determines that the object to be inspected is normal only when it matches and the number of fasteners is abnormal when they do not match,
It is provided with.
[0010]
Further, a mask area setting for setting a mask area (M) provided at the position of the fixture of the inspection object on the image after development of the inspection object based on the X-ray transmission amount and for removing from the foreign object detection area. Part (17a);
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) detects the number of the fasteners and individually detects the presence or absence of foreign matter in the inspection object (W), and detects foreign matter in the extracted image that does not include the mask area. In such a case, the inspection object may be determined as a defective product on the basis of either the case where the number of fasteners is abnormal.
[0011]
Further, the inspection object (W) has a substantially rod-like body in which the contents are wrapped in a packaging body and both ends in the length direction are fastened with fasteners (S1, S2),
The defect determination unit (17c) sets areas (E1, E2) divided in the length direction corresponding to the shape of the inspection object, and the number of fasteners in each area. The It can be configured that the object to be inspected is normal only when it matches when compared with the preset number, and the number of fasteners is determined to be abnormal when they do not match.
[0012]
In addition, the defect determination unit (17c) sets auxiliary areas (E11, E21) in an outer region adjacent to the areas (E1, E2),
A configuration may be adopted in which the number of fasteners is determined to be abnormal even when foreign matter in the auxiliary area is detected when the number of fasteners (S) is determined.
[0013]
According to the X-ray foreign matter detection method of the present invention, X-rays are exposed to an inspection object (W) provided with a fastener (S) that is detected as a foreign matter, and the inspection is performed 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 X-rays transmitted through the object,
Each area is divided into a plurality of areas each including the position of the fastener of the inspection object on the image after development of the inspection object; and
Comparing the number of fasteners to be detected as foreign matter in each of the divided areas with a preset number;
The object to be inspected is normal only when the comparison results match, and when the numbers do not match, the number of fasteners is abnormal and the object is determined to be defective.
[0014]
According to the above configuration, the plurality of areas E <b> 1 and E <b> 2 are divided so that the developed image of the inspection object W includes the position of the fastener S of the inspection object W. A predetermined number of fasteners S are provided in each of the divided areas E1 and E2, and are detected as foreign matters. Then, the number of fasteners S actually detected as a foreign object is compared with a preset number, and it is determined that the object to be inspected is normal only when they match. When the number of detected foreign objects is less than or equal to the set number, the number of fasteners is determined to be abnormal.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view showing an external appearance of the X-ray foreign object detection device.
The X-ray foreign matter detection apparatus 1 is provided in a part of the transport line and detects the presence or absence of foreign matter mixed in the inspection object W (including the surface) that is sequentially transported at a predetermined interval. In this X-ray foreign matter detection apparatus 1, a transport unit 3 and a foreign matter detection unit 4 are provided inside the apparatus main body 1a, and a display 7 is provided at the upper front of the apparatus main body 1a.
[0016]
The conveyance unit 3 conveys, for example, inspected articles W of various varieties such as raw meat, fish, processed food, and medicine. The inspected objects W in this embodiment are ham, sausage, etc., and a package (vinyl) It means that the packaging state of the contents is maintained by fastening the end of the sheet) with a fastener (clip) S. Hereinafter, in this embodiment, the inspection object W is a rod-shaped sausage, and an example in which 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 object in normal X-ray detection.
[0017]
The conveyance part 3 is comprised with the belt conveyor arrange | positioned horizontally with respect to the apparatus main body 1a. The conveyance unit 3 conveys the inspection object W carried from the carry-in port 3a toward the carry-out port 3b (carrying direction X in the drawing) at a predetermined carrying speed set in advance by driving of the drive motor 6. 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.
[0018]
The foreign matter detection unit 4 detects foreign matter in the middle of the transport path of the workpiece W to be transported, and an X-ray generator 8 provided at a predetermined height above the transport unit 3 and the transport unit 3 An X-ray detector 9 provided to face the X-ray generator 8 is provided.
[0019]
The X-ray generator 8 has a configuration in which a cylindrical X-ray tube 12 provided in a metal box 11 is immersed in an insulating oil (not shown), and an electron beam from the cathode of the X-ray tube 12 is an anode target. X-rays are generated by irradiation. The X-ray tube 12 is provided in a direction (Y direction) whose longitudinal direction is orthogonal to the conveyance direction X of the inspection object W. The X-rays generated by the X-ray tube 12 are exposed to the lower X-ray detector 9 in the form of a substantially triangular screen by a slit (not shown) along the longitudinal direction.
[0020]
The X-ray detector 9 detects X-rays that pass through the inspection object W when the X-rays are exposed to the inspection object W, and according to the detected transmission amount of the X-rays. An electrical signal is being output. The X-ray detector 9 is provided along the Y direction orthogonal to the transport direction X of the inspection object W transported on the transport unit 3. The X-ray detector 9 is an array line sensor including a plurality of photodiodes arranged in a line and a scintillator provided on the photodiode.
[0021]
In the X-ray detector 9 having such a configuration, when X-rays are exposed to the inspection object W from the X-ray generator 8, the X-rays transmitted through the inspection object W are received by the scintillator. And convert it to light. Further, the light converted by the scintillator is received by a photodiode disposed below the light. Each photodiode converts the received light into an electrical signal and outputs it. The X-ray detector 9 outputs an electrical signal having a level corresponding to the intensity of the received X-ray to the processing means 13.
[0022]
FIG. 2 is a block diagram showing an electrical configuration of the apparatus.
The processing means 13 is constituted by a CPU and the like and a memory and the like, and X-ray transmission data is input 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.
In the data memory 14, the 640 pieces of X-ray transmission data per line (Y direction) are at least the length in the transport direction X of the object W to be transported (detection period from the front end Wa to the rear end Wb). ) Is stored (for example, 480 lines). Based on this data, the processing means 13 inspects the contamination of the object W to be inspected.
[0023]
The transport unit 3 is provided with a position detector 10 such as a light projecting / receiving sensor for detecting the inspection object W. The 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 projecting / receiving position as a start trigger, and the shielding period is the length of the inspection object W. It is determined that the period is (detection period), and X-ray transmission data for each object W is taken into the data memory 14.
[0024]
The contents of the inspection process include whether or not foreign matter such as metal, glass, stone, or bone is mixed in the inspection object W based on an electrical signal corresponding to the transmission level of X-rays transmitted through the inspection object W. Make a decision. As a basic principle, when a state where X-rays do not transmit 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. Further, the image data obtained by directly developing the input data is output to the display unit 15 of the display unit 7 via the image processing unit 16.
[0025]
The processing means 13 is configured to perform image processing by the image processing unit 16 so that the clip S attached to the inspection object W is not erroneously recognized as a foreign material during the defective product determination processing due to the foreign material mixing.
The defect detection unit 17 does not detect the clip S as a foreign object, and determines whether or not a predetermined number of clips S are attached to the inspection object W.
The defect detection unit 17 is a function related to image processing in the image processing unit 16.
[0026]
The defect detection unit 17 includes a mask area setting unit 17a, an inspection object extraction unit 17b, and a defect determination unit 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.
[0027]
FIG. 3 is a diagram showing the mask region M. As shown in FIG.
As shown in the figure, the mask area M is set with a predetermined range on a predetermined coordinate axis position of the inspection object W with reference to the inspection object W. The inspection object W is developed using the signal input timing of the start trigger whose tip is blocked by the position detector 10 during conveyance of the conveyance unit 3 as a reference position RF.
The mask region M is also based on the reference position RF of the X-ray transmission image of the inspection object W, and is on the coordinate axis positions x1, y1 and x2, y2 positions set in synchronization with the start trigger signal input. Are set with predetermined ranges xL and yL, respectively. The set mask area M has a predetermined number of pixels (number of dots) n.
[0028]
The inspection object extraction unit 17b extracts an X-ray transmission image of the inspection object W excluding the mask area M as an extracted image A for foreign matter determination inside the inspection object W.
The clip S that is a foreign object is located in the mask area M, and the clip S is not included in the extracted image A. Thereby, the foreign substance detection only in the inside of the sausage which is a storage thing can be performed by the said process based on the X-ray transmission amount in the extraction image A. Although not shown in detail, the X-ray transmission image after image expansion displayed on the display unit 15 or the like has a different display density according to the X-ray transmission amount.
Further, the original developed image before the mask process is output to the defect determination unit 17c for detecting the number of clips S described later.
[0029]
In the defect determination unit 17c, a length L of the inspection object W and a predetermined number n of clips S are set and stored as preset values. Then, based on the X-ray transmission amount of the object W to be inspected, a defective product is determined based on whether or not the number n of clips S is the specified number.
[0030]
FIG. 4 is a diagram for explaining the processing content when a clip is detected.
Specifically, as shown in the figure, a length L / 2 obtained by dividing the length L of the inspection object W into two is obtained, and the image of the inspection object W slightly exceeds L / 2 from the center of the two divisions. The number of clips S on the image in the range (the front area E1 and the rear area E2) (that is, the number of places where a low X-ray transmission amount corresponding to a foreign substance is obtained) is counted while scanning. In the front area E1 and the rear area E2, ranges exceeding L / 2 from the center of the inspection object W are set as auxiliary areas E11 and E21, respectively.
[0031]
If the number of clips counted is the specified number n, it is determined to be normal, and if it is less than or greater than the specified number n, it is determined to be defective. In the example of the sausage, it is determined that the clip is normal only when the clips S1 and S2 are detected one by one on each screen divided into two.
[0032]
Next, an X-ray foreign object detection operation with the above configuration will be described.
In the X-ray foreign matter detection apparatus 1 configured as described above, when the inspection object W is carried in from the carry-in port 3a of the conveyance unit 3, the X-ray generator 8 sends the inspection object W to the inspection object W during the conveyance 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.
[0033]
Then, the processing means 13 determines whether or not foreign matter is mixed in the inspection object W based on an electric signal corresponding to the amount of X-ray transmission detected by the X-ray detector 9, and the determination result A sorting signal indicating a non-defective product or a defective product is output externally.
Specifically, except for the mask area M where the clip S exists The When the X-ray transmission amount of the inspection object W in the range is equal to or less than the threshold set for detecting foreign matter, it is determined that foreign matter is mixed.
Then, the inspection object W that has been subjected to the inspection is sorted into a non-defective product and a defective product according to a sorting signal output from the processing means 13.
[0034]
Further, the image processing unit 16 of the processing unit 13 displays and outputs image data indicating the X-ray transmission amount output from the X-ray detector 9 on the display unit 15. It is possible to confirm the state of the outer shape viewed from the plane of the inspection object W and the degree of transmission of X-rays in the inspection object W, and the display density of the foreign matter portion is different from the others (dark or surrounding and other Color), the position where the foreign substance is mixed can be grasped.
Also, the pass / fail judgment results of “OK” and “NG”, and the inspection results of the total number of inspections, the number of non-defective products, and the total number of NG are displayed.
[0035]
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 line is included. Strictly speaking, when the X-ray transmission amount is lower than the reference value (when X-rays do not pass through due to foreign matter), it is determined as NG, and when the X-ray transmission amount is higher than the reference value, it is determined as OK. , “NG” or “OK” is displayed.
[0036]
Next, a defective product detection operation (detection of the number of clips) in the above configuration will be described. FIG. 5 is a flowchart showing the defective product detection process.
In parallel with the foreign object detection operation or in parallel with the foreign object detection operation, the defect determination unit 17c detects whether or not a predetermined number of clips S are attached to the inspection object W. The processing means 13 determines a final defective product based on the presence / absence of foreign matter in the inspection object W and the coincidence detection of the specified number of clips S.
[0037]
In the defect determination unit 17c, the length L of the inspection object W and the number n of clips S are set as the above set values (S1). In the case of sausage, n = 1 is set (one for the front and one for the rear).
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, clip recognition processing is performed based on the developed developed image of the inspected object W (S3).
[0038]
First, based on the length L, the developed image of the inspection object W is divided into two parts in the front and rear along the conveyance direction. At this time, the clip is individually recognized as a front area up to a range slightly beyond the front L / 2 in the transport direction with the reference position RF as a reference, and as a rear area up to a range slightly beyond L / 2 thereafter. The reference position RF is a time when the position detector 10 detects the leading position of the inspection object W as described above, and corresponds to the position of the leading edge (one end) of the inspection object W in the X-ray transmission image.
[0039]
Next, the defect determination unit 17c determines the position and detects the number of clips S in these two front and rear areas E1 and E2 (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 within the range of the front area E1 is counted (S5). Here, since the clip S is made of metal, the level corresponding to the foreign object detection is detected as the clip S.
Specifically, the developed image is scanned, and a single pixel corresponding to the foreign object detection level (low X-ray transmission amount) is determined as one clip S1 in the front area E1, and the count number is 1. increase.
[0040]
Next, it is determined whether or not the count number in the front area E1 matches the clip number n (S7). In the flowchart, it is described as a configuration in which the process proceeds to S2 after S5 ends and the same processing is executed in the rear area. In the position determination (S4), branching to the rear area E2 (S4-rear area) side by the end of the front area E1, and forward determination is performed by the end of the detection process in the front area E1 (S6-Yes) (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, it is determined that the number of clips S in the front area E2 is the specified number and is normal. To do. Therefore, when the count number is 0 or 2 or more, it is determined that the number of clips S is abnormal.
[0041]
Thereafter, in the rear area E2, the number of clips S is counted in the same manner as the processing in the front area E1 (S8). After the front and rear ends in the position determination (S4-end before and after), the count number in the rear area E2 is clipped. It is determined whether or not the number n matches (S9), and the process ends.
[0042]
FIG. 6 is a diagram illustrating 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, it is judged normal in each process of S7 and S9, and is output to the processing means 13 as no defect regarding the number of clips S. The processing means 13 determines defective products by comprehensively determining whether foreign matter is mixed in the inspection object W using the mask area M and the result of the number of clips S. When the number of clips S is normal as described above, it is determined that the product is a normal product if no foreign matter is mixed.
[0043]
On the other hand, in all of FIGS. 6B to 6G, the inspection object W is determined as a defective product.
In the state shown in FIG. 6B, since the number of clips S in the front area E1 is 0, the set value n = 1 does not match and it is determined as a defective product. In this case, it can be determined and output that the clip S in front of the object W is missing. In the case of sausage, if one clip S is missing, it is clear that it is a defective product.
[0044]
In the state shown in FIG. 6C, since the number of clips S in the rear area E2 is 0, it does not coincide with the set value n = 1 and is determined as a defective product. In this case, it can be determined that the clip S behind the object W is missing.
[0045]
In the state shown in FIG. 6D, the number of clips S in the front area E1 is 1, and the front area E1 is determined to be normal because it matches the set value n = 1. However, since the number of clips S in the rear area E2 is 2, the detection state in the auxiliary area E21 is determined. When the clip S3 is detected in the auxiliary area E21, it is determined as a defective product. In this state, although the clips S1 and S2 are attached one after the other on the inspection object W itself, a clip S3 of another defective inspection object Wn partially cut is detected in the auxiliary area E21. Based on that. This defect Covered The inspection object Wn may occur as a defective product during the manufacturing process, and this defective product can be detected.
[0046]
In the state shown in FIG. 6 (e), the number of clips S in the front area E1 is 1, and the front area E1 is determined to be normal because it matches the set value n = 1. Further, the number of clips S in the rear area E2 is one. However, the clip S2 in the range of L / 2 based on the length of the inspection object W is not detected and is zero. One clip S3 is detected in the auxiliary area E21.
In this state, one clip S1 is attached only to the front side of the inspection object W itself, but there is no rear clip S2, and another partially defective inspection object Wn in a cut state is simultaneously present. Can occur if detected.
[0047]
In the state shown in FIG. 6F, the number of clips S in the front area E1 is 2, and the clip S2 in the rear area E2 is not 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 as a defective product.
[0048]
In the state shown in FIG. 6G, the number of clips S2 in the rear area E2 is 1, but the number of clips S in the front area E1 is 2, which 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 as a defective product.
[0049]
As in the above examples, not only the number of clips S of a single inspection object W but also other clips S (S0, S3) close to the target inspection object W based on the binding failure of the clip S or the like. ) Is also detected as a defect in the manufacturing process. Thereby, a strict defective product inspection can be performed, and the reliability of the inspection object W determined as a normal product can be improved.
[0050]
In the above setting, an example of a variety (sausage) in which one clip S is provided on each side of each inspection object W has been described. Even in the case of a product type having two or more clips S, it is determined in consideration of the length of the inspection object W, so that defective products in each state can be accurately determined as described above.
[0051]
In the embodiment described above, the reference position RF is obtained by detecting the tip position of the inspection object W in the transport direction with the position detector 10. However, the present invention is not limited thereto, and the reference position RF may be set by detecting the tip position of the inspection object W based on the change in the amount of X-ray transmission when scanning the image processing in the image processing unit 16. A clip S is provided at the tip position, and this clip S can be easily detected because it differs greatly from the amount of X-ray transmission before and after. In this case, the position detector 10 is unnecessary.
[0052]
Next, FIG. 7 is a figure which shows the example of another kind.
The object to be inspected W is a product in which a plurality of the sausages (4 in the illustrated example) are packaged by one package T in units of four.
In the case of such an object to be inspected W, a plurality of mask areas M are set individually corresponding to the positions of the clips S of the objects to be inspected W in the package T for the foreign substance detection mask area M. As a result, foreign matter can be detected as described above. In addition, when there is an allowance for each inspection object W to move back and forth in the transport direction (position shift) within the package T, the mask region M is increased in advance along the transport direction in correspondence with the surplus amount. Also good.
[0053]
On the other hand, the same applies to the detection of the number of clips S, and as shown in the figure, defective products may be detected in areas divided into two parts in the front and rear directions based on the length of the package T. In the example shown in the figure, the number of clips is n = 4, and it is normal if four clips S are detected in each of the front area E1 and the rear area E2, and any of them is less than four or when five or more are detected. In addition, it is determined that the product (inspected object W) of the package T is a defective product.
[0054]
Moreover, FIG. 8 is a figure which shows the state from which the conveyance direction of the to-be-inspected W (sausage) demonstrated above 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 similarly to the above based on the developed image captured by the image processing unit 16. It is also possible to set a reference position RF for one clip S, and set a mask position M for detecting foreign matter, a length L for detecting the number of clips, and areas E1 and E2. For convenience, this is equivalent to rotating the developed image 90 degrees and performing the same processing as described above.
[0055]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, even if it is a to-be-inspected object which has a fastener detected as a foreign material, the number of fasteners can be detected correctly and the reliability of the defect detection of a to-be-inspected object can be improved. In addition, it is possible to detect foreign matters at parts other than the fasteners of the inspection object by setting the mask area. By detecting this foreign matter and judging the number of the above-mentioned fasteners, defective products of the inspection object can be detected more accurately. become able to.
Since varieties such as ham and sausage using such fasteners have an abnormal number of fasteners, the packaging state is clearly defective and cannot be shipped as defective products. As a result, the production efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an external appearance of an X-ray foreign object detection device according to the present invention.
FIG. 2 is a block diagram showing an electrical configuration of an X-ray foreign object detection device according to the present invention.
FIG. 3 is a diagram showing a mask region.
FIG. 4 is a diagram showing an area for clip recognition.
FIG. 5 is a flowchart showing defective product detection processing;
FIG. 6 is a diagram showing various states of an inspection object.
FIG. 7 is a view 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 object 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 material detection apparatus, 3 ... Conveyance part, 8 ... X-ray generator, 9 ... X-ray detection part, 13 ... Processing means, 16 ... Image processing part, 17 ... Defect detection part, 17a ... Mask area | region setting part 17b: inspection object extraction unit, 17c: defect determination unit, E1: front area, E2: rear area, E11, E21: auxiliary area, M: mask area, W: inspection object.

Claims (5)

X-rays are exposed to an inspection object (W) provided with a fastener (S) that is detected as a foreign object, and transmission of the X-rays transmitted through the inspection object with the exposure of the X-rays. In the X-ray foreign matter detection device (1) for detecting the presence or absence of foreign matter in the inspection object from the quantity,
On the image after development of the inspection object, each area is divided into a plurality of areas each including the position of the inspection object fastener, and the number of fasteners to be detected as foreign objects in each of the divided areas A defect determination unit (17c) that determines that the object to be inspected is normal only when it matches and the number of fasteners is abnormal when they do not match,
An X-ray foreign matter detection apparatus comprising: A mask area setting unit for setting a mask area (M) that is provided at the position of the fixture of the inspection object on the image after development of the inspection object based on the amount of X-ray transmission and for removing from the foreign object detection area ( 17a)
An inspection object image extraction unit (17b) that extracts 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; 17c) detects the number of fasteners and individually detects the presence or absence of foreign matter in the inspection object (W). When foreign matter is detected in the extracted image not including the mask region, or The X-ray foreign material detection apparatus according to claim 1, wherein the inspection object is determined as a defective product based on any of the cases where the number of fasteners is abnormal. The object to be inspected (W) has a substantially rod-like body in which the contents are wrapped in a packaging body and both ends in the length direction are fastened with fasteners (S1, S2),
The defect determination 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. The X-ray foreign object detection device according to claim 1, wherein the object to be inspected is normal only when they match, and the number of fasteners is determined to be abnormal when they do not match. The defect determination unit (17c) sets auxiliary areas (E11, E21) in an outer region adjacent to the areas (E1, E2),
The X-ray foreign material detection apparatus according to any one of claims 1 to 3, wherein the number of fasteners is determined to be abnormal even when a foreign material in the auxiliary area is detected at the time of determining the number of the fasteners (S). X-rays are exposed to an inspection object (W) provided with a fastener (S) that is detected as a foreign object, and transmission of the X-rays transmitted through the inspection object with the exposure of the X-rays. In the X-ray foreign matter detection method for detecting the presence or absence of foreign matter in the inspection object from the amount,
Each area is divided into a plurality of areas each including the position of the fastener of the inspection object on the image after development of the inspection object; and
Comparing the number of fasteners to be detected as foreign matter in each of the divided areas with a preset number;
An X-ray foreign object detection method comprising: determining whether an object to be inspected is normal only when the comparison results match, and determining that the object to be inspected is defective because the number of fasteners is abnormal when they do not match.

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