JP6346764B2 - Foreign matter inspection device - Google Patents

Description

  The present invention relates to a foreign matter inspection apparatus for inspecting foreign matter mixed in an inspection object such as food.

  In order to prevent products contaminated with foreign substances from being shipped in food manufacturing plants, etc., inspection of contamination by using inspection equipment such as metal detection equipment and X-ray foreign matter inspection equipment at the final stage of raw material reception and production processes. Has been done. However, the metal detection device can detect metallic foreign matters mixed in the inspection object, but cannot detect non-metallic foreign matters. The X-ray foreign substance inspection apparatus can detect metal foreign substances mixed in the object to be inspected. However, in principle, the lower the density, the harder it is to detect, and there is a problem that, for example, iron rust and aluminum cannot be detected. In order to compensate for these weak points, the metal detection device and the X-ray foreign matter inspection device have been used in series arranged before and after the conveying means.

  As foreign object inspection methods in which a metal detection device and an X-ray foreign object inspection device are arranged in series before and after the conveying means, conventional techniques described in Patent Document 1, Patent Document 2, and Patent Document 3 below are known.

FIG. 8 shows a conventional embodiment in which a front-stage metal detection apparatus 200 and a rear-stage X-ray foreign substance inspection apparatus 100 are arranged in series.
In Patent Document 1 (Japanese Patent Laid-Open No. 9-49883), Patent Document 2 (Japanese Patent Laid-Open No. 2003-294852), and Patent Document 3 (Japanese Patent Laid-Open No. 2008-268035), the conveyance direction of the inspection object is described. A configuration in which a metal detector and an X-ray inspection apparatus are arranged in series is described. Specifically, as shown in FIG. 8, the inspection object 180 is conveyed by the conveyor 260 in the direction of the arrow, and is carried in and out through the opening 220a and the opening 220b of the detection means 220 of the preceding metal detection device. However, the metallic foreign matter mixed in the inspection object can be detected by calculating the magnetic field change by the detecting means. Setting of various parameters, display of detection results, and the like are performed by the operation indicator 210. Subsequently, the object to be inspected is carried in and out of the X-ray shielding curtain 120a from the opening 190a and the X-ray shielding curtain 120b through the opening 190b of the subsequent stage X-ray foreign substance inspection apparatus. When the generated X-rays pass between the irradiated X-ray detectors 140, the foreign matter is detected by image analysis of the density difference between the inspection object and the mixed foreign matter. Setting of various parameters, display of images and detection results, and the like are performed by the operation indicator 110. In general, the inspection object mixed with the detected foreign matter is removed from the production line by a removal device (not shown) after being carried out from the opening 190b of the X-ray foreign matter inspection device.

FIG. 9 shows a conventional example in which the metal detector 200 at the front stage is arranged in series within the X-ray foreign substance inspection apparatus 100 at the rear stage.
Patent Document 1 describes a configuration in which a metal detector is housed inside an X-ray shield (shield) of an X-ray inspection apparatus and arranged in series upstream of the X-ray sensor. ing. Specifically, as shown in FIG. 9, the inspection object 180 is conveyed by the conveyor 160 in the direction of the arrow, and is detected by the X-ray shielding curtain 120a and the metal detection device from the opening 190a of the X-ray foreign substance inspection device. It is carried in and out through the openings 220a and 220b of the means 220 and the opening 190b of the X-ray foreign substance inspection apparatus from the X-ray shielding curtain 120b, but the change of the magnetic field by the detection means of the metal detection apparatus in the previous stage is processed. As a result, metallic foreign matter mixed in the object to be inspected is detected, and setting of various parameters, detection result display, and the like are performed by the operation indicator 210. When the inspection object passes between the X-ray detectors 140 irradiated with the X-rays generated by the X-ray generator 130 at the subsequent stage, the foreign object is detected by image analysis of the density difference between the inspection object and the mixed foreign object. To do. Setting of various parameters, display of images and detection results, and the like are performed by the operation indicator 110. In general, the inspection object mixed with the detected foreign matter is removed from the production line by a removal device (not shown) after being carried out from the opening 190b of the X-ray foreign matter inspection device.

JP-A-9-49883 (FIGS. 7 and 8) Japanese Unexamined Patent Publication No. 2003-294852 (FIGS. 1, 4, and 5) JP 2008-268035 A (FIG. 1)

(Problems of conventional technology)
In the apparatuses described in Patent Documents 1 to 3, since the metal detection apparatus and the X-ray foreign substance inspection apparatus are arranged in series in the front and rear, the size of the entire apparatus becomes large. However, the production lines in factories have many facilities that have been added one after another, and there are many narrow sites. The devices described in Patent Document 1, Patent Document 2, and Patent Document 3 in which the metal detection device and the X-ray foreign substance inspection device are arranged in series in the front and back. There is a limit to installing the system on the factory production line, and the development of a space-saving device has been desired.

  Also, the metal detection information from the preceding metal detection device and the foreign object detection information from the subsequent X-ray foreign material inspection device are collated to determine whether the foreign material is metallic, aluminum or iron rust, or non-metallic foreign material. Since there is a distance between the metal detection device and the X-ray foreign substance inspection device and the detection timing is different, the determination is complicated when there are multiple products between them and there are multiple foreign objects mixed in. There is a problem. In addition, since the detection times are different, there is a problem that the product is likely to move due to other situations such as stoppage of the conveying means or vibration of the conveying means during that time, and there is a case where the product cannot be reliably determined.

  Usually, a common removal device is provided after the metal detection device and the X-ray foreign matter inspection device to automatically exclude products contaminated with foreign matter. However, when each of them is arranged in series, if there are a plurality of products between them and a plurality of foreign matters are mixed, the removal process becomes complicated, and the arrival time from the metal detection device to the removal device and the X-ray Since the arrival time from the foreign substance inspection device to the removal device is also different, there is a problem that it is necessary to set the time until the removal is performed for each device.

  An object of the present invention is to downsize an apparatus capable of metal detection and X-ray foreign matter inspection.

In order to solve the technical problem, the foreign matter inspection apparatus according to claim 1 comprises:
Transport means for transporting the object to be inspected;
A transmission unit that generates a magnetic field; and a reception unit that directly links the magnetic field generated by the transmission unit, and the metallic foreign matter mixed in the inspection object conveyed by the conveyance unit is based on the magnetic field. And a shield that shields a leakage magnetic field from the metal detector formed integrally with at least one of an upstream side and a downstream side of the metal detector with respect to a conveyance direction of the inspection object. A passage portion having a hood and accommodating the metal detection portion and extending along a conveyance path through which the object to be inspected is conveyed is formed to prevent leakage magnetic field and external magnetic field from entering the metal detection portion. A metal detection means having a casing of the metal detection means to be shielded, and an X-ray passage part formed in the casing of the metal detection means;
X-ray detection means for detecting foreign matter mixed in the inspection object passing through the passage portion by X-rays passing through the X-ray passage portion;
Wherein with a housing for accommodating the accommodated and the X-ray detector inside the interior of the metal detector, the said metal detector when viewed from the direction intersecting the conveying direction of the object to be inspected A foreign substance inspection apparatus housing that is housed in an overlapping state with the X-ray detection means and shields leakage of X-rays to the outside;
With
The shielding hood has a length along the conveyance direction of the inspection object set to be twice or less the height of the opening into which the inspection object is carried,
The length from the upstream end to the downstream end of the casing of the metal detection means including the shielding hood is set to be not more than 8 times the height of the opening with respect to the conveyance direction of the inspection object. And
The X-ray passing part is inside the outer end of the housing of the metal detecting unit including the shielding hood and outside the outer end of the metal detecting part with respect to the conveyance direction of the inspection object. Placed in the
It is characterized by that.

  According to the first aspect of the present invention, the apparatus capable of metal detection and X-ray foreign substance inspection can be downsized as compared with the case where the configuration of the present invention is not provided.

FIG. 1 is an explanatory diagram of the foreign matter inspection apparatus according to the first embodiment. FIG. 2 is an enlarged view of the metal detection means and the X-ray detection means of the first embodiment. FIG. 3 is a perspective view of the metal detection means and the X-ray detection means of the first embodiment. FIG. 4 is an enlarged view of the metal detection unit and the X-ray detection unit of the second embodiment, and corresponds to FIG. 2 of the first embodiment. FIG. 5 is an enlarged view of the metal detection means and the X-ray detection means of the third embodiment, and corresponds to FIG. 2 of the first embodiment. FIG. 6 is an enlarged view of the metal detection unit and the X-ray detection unit of the fourth embodiment, and corresponds to FIG. 2 of the first embodiment. FIG. 7 is an enlarged view of the metal detection means and the X-ray detection means of the fifth embodiment, and corresponds to FIG. 2 of the first embodiment. FIG. 8 shows a conventional embodiment in which a front-stage metal detection apparatus 200 and a rear-stage X-ray foreign substance inspection apparatus 100 are arranged in series. FIG. 9 shows a conventional example in which the metal detector 200 at the front stage is arranged in series within the X-ray foreign substance inspection apparatus 100 at the rear stage.

Next, examples as specific examples of embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following examples.
In order to facilitate understanding of the following description, in the drawings, the front-rear direction is the X-axis direction, the left-right direction is the Y-axis direction, the up-down direction is the Z-axis direction, and arrows X, -X, Y, -Y, The direction indicated by Z and -Z or the indicated side is defined as the front side, the rear side, the right side, the left side, the upper side, the lower side, or the front side, the rear side, the right side, the left side, the upper side, and the lower side, respectively.
In the figure, “•” in “○” means an arrow heading from the back of the page to the front, and “×” in “○” is the front of the page. It means an arrow pointing from the back to the back.
In the following description using the drawings, illustrations other than members necessary for the description are omitted as appropriate for easy understanding.

FIG. 1 is an explanatory diagram of the foreign matter inspection apparatus according to the first embodiment.
In FIG. 1, a foreign substance inspection apparatus 10 according to the first embodiment of the present invention includes an operation indicator 11 that commonly performs various parameter settings, image display, detection result display, and the like. An opening 19a for carrying in is formed at the left end of the foreign object inspection apparatus 10, and an opening 19b for carrying out is formed at the right end. In addition, X-ray shielding curtains 12a and 12b are disposed in the openings 19a and 19b.
The foreign material inspection apparatus 10 is provided with a conveyor 16 as an example of a conveying unit. The conveyor 16 extends from the left side of the carry-in part 19a to the right side of the carry-out part 19b through the inside of the foreign matter inspection apparatus 10. The conveyor 16 according to the first embodiment is configured to be able to convey the inspection object 18 from the left to the right.

FIG. 2 is an enlarged view of the metal detection means and the X-ray detection means of the first embodiment.
FIG. 3 is a perspective view of the metal detection means and the X-ray detection means of the first embodiment.
2 and 3, a search coil 22 as an example of a metal detection unit is disposed inside the foreign object inspection apparatus 10. The search coil 22 according to the first embodiment includes a cylindrical rectangular tube frame 22a that extends in the left-right direction as an example of a housing. In the rectangular tube frame 22a, a passage portion 22b is constituted by a hollow portion at the center of the tube. In the passage portion 22b, the conveyor 16 is disposed in a penetrating manner.
The rectangular tube frame 22a accommodates coil main bodies 23 and 24 as an example of a metal detector. In the search coil 22 according to the first embodiment, a transmission coil 23 as an example of a first coil and an example of a transmission unit is configured in an annular shape (ring shape) surrounding the passage portion 22b.

  Further, on the upstream side and the downstream side in the conveyance direction of the inspection object 18 by the conveyor 16 with respect to the transmission coil 23, there are reception coils 24a and 24b as an example of a second coil as an example of a receiving means. Has been placed. Similarly to the transmission coil 23, the reception coils 24a and 24b of the first embodiment are also arranged in a bilaterally symmetrical and coaxial ring so as to surround the passage portion 22b. The transmission coil 23 is supplied with an alternating excitation current from the metal detection control unit 31, and generates a magnetic field in the passage portion 22b. Therefore, the search coil 22 of the first embodiment is configured by a so-called transmission coil coaxial arrangement type search coil.

In FIG. 2, in the foreign matter inspection apparatus 10 according to the first embodiment, the rectangular tube frame 22 a of the search coil 22 includes an upstream shielding hood 22 e that extends upstream from the upstream end of the portion in which the coil bodies 23 and 24 are accommodated. A downstream shielding hood 22f extending from the downstream end to the downstream side is supported.
In Example 1, the height H1 of the openings of the shielding hoods 22e and 22f is set to 150 mm, and the length L1 of the shielding hood is set to 75 mm which is ½ of the height of the opening. As a result of actual measurement by displacing the metal body at the extension 50 mm position in the center of the frontage of the hoods 22e and 22f, the rotation and displacement of the metal body such as the pulley 17 and the X-ray shielding curtains 12a and 12b close to the search coil 22, It was also found that the influence of external electromagnetic noise can be reduced to 60%.

Preferably, in order to further enhance the effect of the leakage magnetic field shielding hood, it is desirable to make the length L1 of the shielding hood equal to the height H1 of the opening. More preferably, the length L1 of the shielding hood is less than twice the height H1 of the opening to further enhance the effect of shielding the leakage magnetic field. Moreover, in the general search coil 22 currently marketed, the length from the upstream end of the shielding hood 22e to the downstream end of the shielding hood 22f is at most 8 times the height H1 of the opening. ing.
In addition, the relationship between the height H1 and the length L1 is not limited to the illustrated relationship, and may vary depending on the method of the search coil 22 and the dimensions of the inspection object 18, required accuracy and sensitivity, installation space, design and specification changes, and the like. It can be changed as appropriate.

In FIG. 2, in the foreign matter inspection apparatus 10 according to the first embodiment, X-ray passage slits 22 c and 22 d as an example of an X-ray passage portion are formed in the shielding hood 22 f on the downstream side. The X-ray passage slits 22c and 22d according to the first embodiment are disposed above and below the passage portion 22b.
Note that the X-ray passage slits 22c and 22d of Example 1 have a width along the conveyance direction of the inspection object 18 set to 2 mm as an example, but a specific numerical value of the width is set to this value. It is not limited and can be changed arbitrarily according to the design and specification change.

  The search coil 22 according to the first embodiment is configured by a metal material casing 22a except for the passage portion 22b, and is provided with shielding hoods 22e and 22f to shield external magnetic field leakage and entry of an external magnetic field. . Therefore, the rotation and displacement of metal bodies such as the pulley 17 and the X-ray shielding curtains 12a and 12b that are close to the search coil 22 and the influence of external electromagnetic noise are avoided. In the search coil 22 according to the first embodiment, the rectangular tube frame 22a is filled with an epoxy resin as an example of a filler, and the coil bodies 23 and 24 are embedded (molded) in the resin. It consists of

In the search coil 22 where high sensitivity is not required, it is not necessary to fill the housing 22a with resin or the like. However, the search coil 22 corresponding to high sensitivity has the exception of the passage portion 22b for the purpose of improving vibration resistance. It is desirable to fill the housing 22a with an epoxy resin or the like. In addition, the filler to be filled is not limited to the epoxy resin, and any material that can be used in the metal detection means using a magnetic field can be used.
In the search coil 22 according to the first embodiment, the metal detection unit 22 is preferably held by the vibration isolation tables 25a and 25b for the purpose of improving the vibration resistance characteristics, but the vibration isolation tables 25a and 25b can be omitted. is there.

An X-ray generator 13 is disposed above the upper X-ray passage slit 22c. The X-ray generator 13 according to the first embodiment is provided with a diaphragm device (not shown). As an example, the X-ray generator 13 has a 1 mm wide fan beam so that the entire region in the front-rear direction of the passage portion 22b can be inspected. Line 15 is output. Further, an X-ray detector 14 extending in the front-rear direction is disposed below the lower X-ray passage slit 22d.
Therefore, the X-ray 15 generated by the X-ray generator 13 passes through the X-ray passage slits 22c and 22d and is irradiated to the X-ray detector 14. The X-ray generator 13 and the X-ray detector 14 constitute X-ray sensors 13 and 14 as an example of the X-ray inspection means of the first embodiment.
In addition, the housing | casing of the foreign material inspection apparatus 10 of Example 1 has a conventionally well-known structure which shields that the X-ray generated by the X-ray generator 13 leaks outside. For example, the housing of the foreign matter inspection apparatus 10 can be made of lead or the like that can shield X-rays. As can be seen from FIG. 2, in the foreign matter inspection apparatus 10 according to the first embodiment, the search coil 22 and the X-ray sensor 13, when viewed from above, which is a direction intersecting the conveyance direction of the inspection object 14 are arranged so as to overlap with each other.

  The control unit (controller) 30 of the foreign object inspection apparatus 10 includes a metal detection control unit 31 that controls the search coil 22, an X-ray inspection control unit 32 that controls the X-ray sensors 13 and 14, and a display control unit 33. Have. The control unit 30 includes an input / output interface I / O for inputting / outputting signals from / to the outside, a ROM storing a program and information for performing necessary processing, read-only memory, and necessary data. RAM: a random access memory, a CPU that performs processing according to a program stored in a ROM, etc .: a central processing unit. Therefore, the control unit 30 of the first embodiment is configured by a small information processing apparatus, a so-called microcomputer. Therefore, the control part 30 can implement | achieve various functions by running the program memorize | stored in ROM etc.

  The metal detection control unit 31 according to the first embodiment controls the alternating excitation current to the transmission coil 23 and determines whether or not metallic foreign matter is mixed in the inspection object 18 based on the current flowing through the reception coil 24. judge. The X-ray inspection control unit 32 according to the first embodiment controls generation of the X-ray 15 by the X-ray generator 13 and foreign matter is mixed into the inspection object 18 based on the detection result of the X-ray detector 14. It is determined whether or not. The display control unit 33 according to the first embodiment controls image display and inspection result display on the operation display 11 (so-called touch panel), and reads input information from the operation display 11.

(Operation of Example 1)
In the foreign matter inspection apparatus 10 according to the first embodiment having the above-described configuration, when the inspection object 18 is inspected for foreign matters, the inspection object 18 is placed on the conveyor 16 and the inside of the foreign matter inspection apparatus 10 is detected. It is conveyed to. The inspection object 18 transported into the foreign substance inspection apparatus 10 passes through the passage portion 22b of the search coil 22.
At this time, a magnetic field is generated by the alternating excitation current from the search coil 22 to the transmission coil 23. When the receiving coils 24a and 24b coaxially arranged symmetrically on both sides of the transmitting coil 23 are linked to each other, the induced electromotive forces induced in the receiving coils 24a and 24b become equal, and the difference between them becomes zero. However, when the inspected object 18 mixed with metallic foreign matter passes through the search coil 22, the interlinkage magnetic flux of the receiving coils 24a and 24b changes with time, so there is a difference between the induced electromotive forces in the two receiving coils 24a and 24b. Will occur. Therefore, when the metal detection control unit 31 calculates the difference between the induced electromotive forces, the mixed metallic foreign matter is detected.

  Further, when the inspection object 18 being inspected for metallic foreign matter by the search coil 22 passes the positions of the X-ray passage slits 22c and 22d, the inspection object 18 is irradiated with the X-rays 15. Therefore, the X-ray 15 transmitted through the inspection object 18 is detected by the X-ray detector 14, and the X-ray inspection control unit 32 detects the signal from the X-ray detector 14 and the density difference between the inspection object 18 and the mixed foreign matter. By performing this image analysis calculation process, foreign matter mixed in the inspection object 18 is detected.

Therefore, in the foreign matter inspection apparatus 10 according to the first embodiment, X-ray passage slits 22c and 22d are formed in the search coil 22, and the search coil 22 and the X-ray sensors 13 and 14 are integrated. Therefore, detection of metallic foreign matter by a magnetic field and detection of foreign matter by X-rays are performed at substantially the same position with respect to the conveyance direction of the inspection object 18.
Therefore, as compared with the configuration in which the metal detection unit and the X-ray inspection unit are arranged in series along the conveyance direction of the object to be inspected as in the prior art, in the foreign matter inspection apparatus 10 of Example 1, The configuration can be reduced in size (space saving, space saving). Therefore, the foreign matter inspection apparatus 10 can be installed even in a narrow place on the production line in the factory.

In the foreign matter inspection apparatus 10 according to the first embodiment, when passing through the search coil 22, a metallic foreign matter inspection using a magnetic field and a foreign matter inspection using the X-ray 15 are performed. Therefore, as in the prior art, when the inspection is performed using separate metal detection means and X-ray inspection means, the difference in detection time can be extremely reduced compared to the case where the detection time is different, and the difference can be made almost zero.
In the conventional technique, the position of the inspection object is moved on the belt conveyor due to the stop or vibration of the conveyance means after the detection by the metal detection means and before the inspection object is conveyed to the X-ray inspection means. There is a fear, and in the worst case, the inspection object inspected by the metal detection means may not match the inspection object inspected by the X-ray inspection means. Therefore, there is a possibility that a foreign matter inspection mistake or inspection omission may occur, and there is a possibility that the foreign matter cannot be detected or the inspection object not containing the foreign matter is removed. In other words, there are cases where foreign matter cannot be reliably identified.

On the other hand, in the foreign matter inspection apparatus 10 according to the first embodiment, the inspection by the magnetic field and the inspection by the X-ray 15 are performed almost at the same time. Occurrence has been reduced. Therefore, in the removal device arranged on the downstream side of the foreign substance inspection apparatus 10, even when removing the inspection object mixed with the foreign substance, the product containing the foreign substance cannot be removed or no foreign substance is mixed. Reduces accidental removal of products.
Further, in the foreign matter inspection apparatus 10 according to the first embodiment, compared to the configuration without the leakage magnetic field shielding hoods 22e and 22d, it is possible to reduce a decrease in accuracy due to external electromagnetic noise when detecting a metallic foreign matter due to a magnetic field, Sensitivity can be improved.

Further, in the foreign matter inspection apparatus 10 of the first embodiment, X-ray passage slits 22c and 22d are formed in the shielding hood 22f where the coil bodies 23 and 24 are not arranged, and between the transmission coil 23 and the reception coil 24b. Compared with the case where the slits 22c and 22d are formed, the manufacturing can be easily performed. In particular, when filling the rectangular tube frame 22a with a filler such as an epoxy resin, it is necessary to prevent the filler from filling the region through which the X-rays 15 pass. The X-ray passage slits 22c and 22d are formed in the shielding hood 22f that is not filled with the agent, and the manufacturing is greatly facilitated.
In the foreign matter inspection apparatus 10 according to the first embodiment, the X-ray passage slits 22c and 22d are formed in the downstream shielding hood 22f. However, the present invention is not limited to this, and the X-ray passage slits 22c, It is also possible to form 22d.

FIG. 4 is an enlarged view of the metal detection unit and the X-ray detection unit of the second embodiment, and corresponds to FIG. 2 of the first embodiment.
Next, a second embodiment of the present invention will be described. In the description of the second embodiment, components corresponding to the components of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. To do.
This embodiment is different from the first embodiment in the following points, but is configured in the same manner as the first embodiment in other points.
4, in the foreign substance inspection apparatus 10 according to the second embodiment, the shielding hood 22f on the downstream side of the search coil 22 includes a shielding hood 22g having a leakage magnetic field extending outward in the vertical direction at the positions of the X-ray passage slits 22c and 22d. 22h is formed.
In the configuration of Example 2, the inventor's experiment showed that the leakage magnetic field shielding hoods 22g and 22h of the X-ray passage slits 22c and 22d had little effect even if they were not provided, but the X-ray passage slit width H2 was reduced. In the present embodiment, which is 2 mm, it has been found that the influence can be sufficiently avoided when the hood length L2 is 5 mm. The relationship between the width H2 and the length L2 is not limited to the illustrated relationship, and can be arbitrarily changed according to required accuracy, sensitivity, design, specification change, and the like.

(Operation of Example 2)
In the foreign matter inspection apparatus 10 according to the second embodiment having the above-described configuration, compared to the configuration described in the first embodiment that does not include the shielding hoods 22g and 22h for the leakage magnetic field, the detection of the metallic foreign matter due to the magnetic field is caused by external electromagnetic noise. The decrease in accuracy can be further reduced and the sensitivity can be improved.

FIG. 5 is an enlarged view of the metal detection means and the X-ray detection means of the third embodiment, and corresponds to FIG. 2 of the first embodiment.
Next, a third embodiment of the present invention will be described. In the description of the third embodiment, the same reference numerals are given to the components corresponding to the components of the first embodiment, and the detailed description thereof will be omitted. To do.
This embodiment is different from the first embodiment in the following points, but is configured in the same manner as the first embodiment in other points.

In FIG. 5, in search coil 22 'of Example 3, the transmission coil 23 which is an example of a 1st coil and an example of a transmission means is arrange | positioned below with respect to the channel | path part 22b. Also, above the passage portion 22b, facing the transmission coil 23 across the passage portion 22b, an upstream receiving coil 24a as an example of a second coil and an example of receiving means, and a downstream receiving portion. A coil 24b is arranged. Note that the receiving coils 24a and 24b of the third embodiment are arranged at intervals along the transport direction.
Therefore, the search coil 22 'according to the third embodiment is configured by a so-called transmission coil facing arrangement type search coil.

(Operation of Example 3)
In the foreign matter inspection apparatus 10 according to the third embodiment having the above-described configuration, as in the first embodiment, the X-ray sensors 13 and 14 are integrated with the search coil 22 ', and space saving is possible.
The transmission coil 23 and the reception coil 24 can be arranged upside down.

FIG. 6 is an enlarged view of the metal detection unit and the X-ray detection unit of the fourth embodiment, and corresponds to FIG. 2 of the first embodiment.
Next, the fourth embodiment of the present invention will be described. In the description of the fourth embodiment, the same reference numerals are given to the components corresponding to the components of the first to third embodiments, and the detailed description thereof will be given. Is omitted.
This embodiment is different from the first to third embodiments in the following points, but is configured similarly to the first to third embodiments in other points.
In FIG. 6, in the foreign matter inspection apparatus 10 of the fourth embodiment, the search hood 22 'of the third embodiment is formed with shielding hoods 22g and 22h corresponding to the X-ray passage slits 22c and 22d, as in the second embodiment. ing.

(Operation of Example 4)
In the foreign substance inspection apparatus 10 according to the fourth embodiment having the above-described configuration, as in the second embodiment, the sensitivity is improved as compared with the case where the shielding hoods 22g and 22h are not formed at the positions of the X-ray passage slits 22c and 22d. Can be expected.

FIG. 7 is an enlarged view of the metal detection means and the X-ray detection means of the fifth embodiment, and corresponds to FIG. 2 of the first embodiment.
Next, the fifth embodiment of the present invention will be described. In the description of the fifth embodiment, the same reference numerals are given to the components corresponding to the components of the first embodiment, and the detailed description thereof will be omitted. To do.
This embodiment is different from the first embodiment in the following points, but is configured in the same manner as the first embodiment in other points.
In FIG. 7, in the foreign substance inspection apparatus 10 according to the fifth embodiment, unlike the first embodiment, the X-ray passage slits 22c and 22d have a rectangular tube frame 22a on the upstream side of the shielding hood 22f and on the downstream side of the receiving coil 24b on the downstream side. Is formed.

(Operation of Example 5)
In the foreign matter inspection apparatus 10 according to the fifth embodiment having the above-described configuration, the X-ray sensors 13 and 14 are integrated with the search coil 22 as in the first embodiment, and space saving is possible.
In the fifth embodiment, the X-ray passage slits 22c and 22d are formed on the upstream side of the shielding hood 22f and the downstream side of the receiving coil 24b on the downstream side, but the present invention is not limited to this. For example, the X-ray passage slits 22c and 22d can be formed on the downstream side of the upstream shielding hood 22e and on the upstream side of the upstream receiving coil 24a. That is, the X-ray passage slits 22c and 22d can be provided inside the outer ends of the shielding hoods 22e and 22f and outside the outer ends of the coil bodies 23 and 24 with respect to the transport direction.

(Example of change)
As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, A various change is performed within the range of the summary of this invention described in the claim. It is possible. Modified embodiments of the present invention are illustrated below.
In the said Example, although the alternating excitation current was supplied to the transmission coil 23 and it illustrated about the detection method using the transmission / reception coil, it is not limited to this. For example, a DC excitation current can be used as the current to be supplied, the transmission coil can be replaced with a permanent magnet, or the reception coil can be replaced with another magnetic sensor. In the metal detection method using a DC magnetic field, it is desirable that the housing 22a and the leakage magnetic field shielding hoods 22e to 22h be made of a magnetic metal material.

In the said Example, although the X-ray generator 13 was arrange | positioned upward and the structure which arrange | positions the X-ray detector 14 below was illustrated, it is not limited to this. For example, when arranging upside down or inspecting a vertically long bottle, the X-ray generator 13 is arranged in the front, the X-ray detector 14 is arranged in the rear, and the X-rays are moved from the front to the rear. Arbitrary changes can be made, such as irradiation. Note that when the X-ray is passed in the front-rear direction, the search coil 22 can also be rotated together.
Moreover, in the said Example, the position relationship of X-ray passage slit 22c, 22d and the positional relationship of coil 23, 24a, 24b is not limited to the positional relationship illustrated in the Example, It can change arbitrarily.

  In the said Example, although the X-ray generator 13 and the X-ray detector 14 illustrated the structure which irradiates the X-ray 15 from the direction orthogonal to the conveyance direction of the to-be-inspected object 18, it is not limited to this. For example, the X-ray 15 may be irradiated from a direction inclined with respect to the transport direction. For example, in the inspection object 18 having a rectangular parallelepiped box, when X-rays are irradiated from the direction orthogonal to the transport direction to the front edge and the rear edge of the box, the length of the X-ray passing through the box is long. As a result, the X-ray image becomes dark and the contrast ratio with the foreign matter becomes low, which may make it difficult to distinguish foreign matters. On the other hand, when the X-rays 15 are irradiated obliquely, the length of passage through the box does not become too long, and the contrast ratio becomes clear and it is easy to distinguish foreign matters. In addition, as a technique for irradiating X-rays from an oblique direction, for example, a technique described in Japanese Patent Application Laid-Open No. 2006-17687 can be employed.

  In the said Example, although the structure of the X-ray generator 13 and the X-ray detector 14 was illustrated one each, it is not limited to this. For example, a configuration in which a plurality of X-ray generators 13 and X-ray detectors 14 are arranged and a foreign object is inspected with a plurality of X-rays may be employed. At this time, a plurality of X-ray passage slits 22c and 22d are formed. In addition, for example, it is possible to divide X-rays from one X-ray generator 13 into two or more by a diaphragm, a slit, or the like, and to provide an X-ray detector 14 corresponding to each X-ray. At this time, by installing a filter or the like, each X-ray detector 14 can detect X-rays having different energies and detect images having different energies.

10 ... Foreign object inspection device,
11 Operation indicator,
12a, 12b ... X-ray shielding curtain,
13 ... X-ray generator,
13, 14 ... X-ray inspection means,
14 ... X-ray detector,
15 ... X-ray,
16 ... conveying means,
17 ... pulley,
18 ... Inspection object,
19a, 19b ... openings of the foreign substance inspection device,
22, 22 '... metal detection means,
22a, 22a "... casing part,
22b, 22b "... passage part,
22c, 22d ... X-ray passing part,
22e, 22f, 22g, 22h ... shielding hood,
23. Transmission means,
23, 24 ... Metal detection part,
24a, 24b ... receiving means,
25a, 25b ... vibration isolator,
30 ... control unit,
31 ... Metal detection control unit,
32 ... X-ray inspection control unit,
33 ... display control unit,
100 ... X-ray foreign matter inspection device,
110 ... Operation display section of the X-ray foreign substance inspection apparatus,
120a, 120b ... X-ray shielding curtain,
130 ... X-ray generator,
140 ... X-ray detector,
150 ... X-ray,
160... Conveyor for X-ray foreign matter inspection device,
170 ... pulley of X-ray foreign matter inspection device,
180 ... Inspection object,
190a, 190b ... openings of the X-ray foreign matter inspection apparatus,
200 ... Metal detection device,
210 ... Operation display section of the metal detection device,
220 ... Metal detection means,
220a, 220b ... opening of the metal detector,
250a, 250b ... vibration isolator,
260 ... Conveyor,
270 ... pulley,
H1 ... the height of the opening of the metal detection means,
H2 ... the width of the X-ray passage part of the metal detection means,
L1 ... the length of the leakage magnetic field shielding hood at the opening of the metal detection means,
L2: The length of the leakage magnetic field shielding hood at the X-ray passage part of the metal detection means.

Claims (1)

A transport means for transporting an object to be inspected;
A transmission unit that generates a magnetic field; and a reception unit that directly links the magnetic field generated by the transmission unit, and the metallic foreign matter mixed in the inspection object conveyed by the conveyance unit is based on the magnetic field. And a shield that shields a leakage magnetic field from the metal detector formed integrally with at least one of an upstream side and a downstream side of the metal detector with respect to a conveyance direction of the inspection object. A passage portion having a hood and accommodating the metal detection portion and extending along a conveyance path through which the object to be inspected is conveyed is formed to prevent leakage magnetic field and external magnetic field from entering the metal detection portion. A metal detection means having a casing of the metal detection means to be shielded, and an X-ray passage part formed in the casing of the metal detection means;
X-ray detection means for detecting foreign matter mixed in the inspection object passing through the passage portion by X-rays passing through the X-ray passage portion;
Wherein with a housing for accommodating the accommodated and the X-ray detector inside the interior of the metal detector, the said metal detector when viewed from the direction intersecting the conveying direction of the object to be inspected A foreign substance inspection apparatus housing that is housed in an overlapping state with the X-ray detection means and shields leakage of X-rays to the outside;
With
The shielding hood has a length along the conveyance direction of the inspection object set to be twice or less the height of the opening into which the inspection object is carried,
The length from the upstream end to the downstream end of the casing of the metal detection means including the shielding hood is set to be not more than 8 times the height of the opening with respect to the conveyance direction of the inspection object. And
The X-ray passing part is inside the outer end of the housing of the metal detecting unit including the shielding hood and outside the outer end of the metal detecting part with respect to the conveyance direction of the inspection object. Placed in the
Foreign matter inspection apparatus characterized by the above.

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