JP2013068518A - X-ray foreign matter detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray foreign matter detector that can prevent the foreign matter detecting performance from deterioration by reducing deviations between two X-ray images obtained by an energy subtraction method.SOLUTION: An X-ray foreign matter detector comprises: a first supporting member 71 that supports an X-ray line sensor 51 kept in an attitude parallel to an X-ray line sensor 52 and is configured to permit position adjustment in the direction of checkup object carriage; a position adjusting member 74 that adjusts the position of the first supporting member 71 in the direction of checkup object carriage; a position adjustment determining unit that acquires a first waveform, which is the waveform of first X-ray image data in the direction of checkup object carriage, and a second waveform, which is the waveform of second X-ray image data in the direction of checkup object carriage, and determines the direction of position adjustment and the extent of position adjustment of the first supporting member 71 on the basis of a phase difference of the tip of the second waveform from the tip of the first waveform; and a display unit that displays the result of determination by the position adjustment determining unit.

Description

  The present invention relates to an X-ray foreign object detection device that detects foreign substances mixed in an object to be inspected such as meat, fish, processed foods, and pharmaceuticals, and in particular, combines foreign images by synthesizing images from a plurality of X-ray line sensors. The present invention relates to an X-ray foreign matter detection apparatus that employs an energy subtraction method for obtaining an enhanced image.

  In general, an X-ray foreign object detection apparatus irradiates X-rays from X-ray generators on various types of inspection objects (for example, meat, fish, processed foods, pharmaceuticals, etc.) that are sequentially conveyed on a conveyance path at predetermined intervals. The inspection object is inspected for foreign substances such as metal, glass, stones, and bones, and a lack of the inspection object, based on the amount of transmitted X-rays.

  Conventionally, in this type of X-ray foreign object detection device, a low energy and a high energy X-ray image pair, that is, a dual energy X-ray image is acquired using X-ray sources having different tube voltages, and these two X-ray images are synthesized. By using the energy subtraction method, the influence of the thickness of the object to be inspected is reduced, and the contrast between the object to be inspected and the foreign object in the object is enhanced to obtain an image in which the foreign object is emphasized (see FIG. For example, see Patent Document 1).

  In the X-ray foreign object detection device employing the energy subtraction method described in Patent Document 1, the first X-ray image is acquired from the combination of the first X-ray source and the first X-ray line sensor, and these From the combination of the second X-ray source and the second X-ray line sensor disposed downstream of the first X-ray source and the first X-ray line sensor in the object conveyance direction, the second X A two-line source and two-sensor configuration configured to acquire a line image is known.

JP 2010-91483 A

  However, in the conventional technique described in Patent Document 1, in the configuration of the two-line source and two-sensor, unless the scan timings of the first X-ray line sensor and the second X-ray line sensor are synchronized, There has been a problem that an image shift of 0.5 pixels at the maximum, that is, a shift of the boundary position of the inspection object occurs between the first X-ray image and the second X-ray image.

  If the position of the boundary between the inspection objects on the two X-ray images is shifted, the position shift of the boundary between the inspection objects on the X-ray image is also increased when the two X-ray images are combined. There is a problem that the foreign object detection performance is greatly impaired.

  The difference in scan timing between the two X-ray line sensors is that the interval between the two X-ray line sensors in the inspection object transport direction is not set to an integral multiple of the element pitch of the X-ray line sensor due to assembly errors or the like. That was the dominant cause.

  Further, since the displacement of the X-ray image is a minute amount of 1 pixel or less, the displacement can be discriminated on the image, but the image displacement is eliminated by image processing such as image size change and image position phase alignment. This is substantially impossible because the information on the foreign matter in the object to be inspected changes at the same time. Therefore, a method for appropriately setting the assembly interval between the two X-ray line sensors has been demanded.

  Therefore, the present invention has been made to solve the conventional problems as described above, and can reduce image misalignment between two X-ray images obtained by the energy subtraction method and prevent deterioration of foreign matter detection performance. An object of the present invention is to provide an X-ray foreign object detection device that can be used.

  The X-ray foreign object detection apparatus according to the present invention provides a transport means for transporting an inspection object on the transport surface in the inspection object transport direction, and X-rays having different intensities on the inspection object transported on the transport surface. The first X-ray source and the second X-ray source to be irradiated are disposed at positions facing the first X-ray source and the second X-ray source across the transport surface, First X-ray image data corresponding to X-rays irradiated from the X-ray source and transmitted through the inspection object, and second X-rays corresponding to X-rays irradiated from the second X-ray source and transmitted through the inspection object A first X-ray line sensor and a second X-ray line sensor that respectively output X-ray image data of the first and second X-ray image data, and the first X-ray image data and second X-ray image data, Output as one image data corresponding to the image, and the image combining means outputs Determining means for determining the presence or absence of foreign matter in the inspection object based on image data, wherein the first X-ray line sensor is replaced with the second X-ray line sensor. A support member configured to be supported while maintaining a parallel posture with respect to the inspection object, and a position for adjusting the position of the support member in the inspection object conveyance direction. An adjustment member, a first waveform that is a waveform in the inspection object conveyance direction in the first X-ray image data, and a second waveform that is a waveform in the inspection object conveyance direction in the second X-ray image data A position adjustment determination means for acquiring a waveform and determining a position adjustment direction and a position adjustment amount of the support member based on a phase difference of a tip portion of the second waveform with respect to a tip portion of the first waveform; Said position And display means for displaying a determination result by the integer judging means, characterized by comprising a.

  With this configuration, the position adjustment direction and the amount of position adjustment for reducing the X-ray image shift are determined by the position adjustment determination unit and displayed on the display unit. Therefore, the user operates the position adjustment member to support the member. The position of the second X-ray line sensor supported by can be easily adjusted. For this reason, the image shift | offset | difference of two X-ray images obtained by an energy subtraction method can be reduced, and the fall of a foreign material detection performance can be prevented.

  Further, in the X-ray foreign object detection device according to the present invention, the position adjustment determination unit may calculate the first waveform based on a difference in the number of pixels at the tip of the second waveform with respect to the number of pixels at the tip of the first waveform. The phase difference of the tip portion of the second waveform with respect to the tip portion of the waveform is obtained.

  With this configuration, the position adjustment determination unit can accurately determine the position adjustment direction and the position adjustment amount.

  In the X-ray foreign object detection device according to the present invention, when the phase of the tip of the second waveform is early with respect to the tip of the first waveform, the position adjustment direction of the support member is the inspection object. It is characterized by determining that it is the downstream side in the transport direction.

  With this configuration, the position adjustment determination unit can accurately determine the position adjustment direction.

  Further, in the X-ray foreign object detection device according to the present invention, the position adjustment determination unit is configured to calculate a product of a phase difference of the tip of the second waveform with respect to the tip of the first waveform and a transport speed of the transport unit. The position adjustment amount is determined based on the determination.

  With this configuration, the position adjustment determination unit can accurately determine the position adjustment amount.

  In the X-ray foreign object detection device according to the present invention, the first X-ray line sensor and the second X-ray line sensor include a single line sensor unit that is controlled at the same control timing. It consists of one X-ray line sensor.

  With this configuration, the operation timings of the first X-ray line sensor and the second X-ray line sensor can be completely synchronized.

  In addition, the X-ray foreign object detection device according to the present invention includes a position adjustment member drive unit that drives the position adjustment member, and a position adjustment member drive unit according to a position adjustment direction and a position adjustment amount determined by the position adjustment determination unit. And a drive control means for controlling the drive.

  With this configuration, since the drive control unit drives and controls the position adjustment member driving unit according to the position adjustment direction and the position adjustment amount determined by the position adjustment determination unit, the position of the second X-ray line sensor supported by the support member Can be adjusted automatically.

  The present invention can provide an X-ray foreign object detection device capable of reducing image displacement between two X-ray images obtained by the energy subtraction method and preventing deterioration of foreign object detection performance.

It is a perspective view which shows schematic structure of the X-ray foreign material detection apparatus which concerns on one embodiment of this invention. It is a figure which shows the side surface and internal structure of the X-ray foreign material detection apparatus which concern on one embodiment of this invention. It is a top view which shows the X-ray line sensor and support mechanism of the X-ray foreign material detection apparatus which concern on one embodiment of this invention. It is a side view which shows the X-ray line sensor and support mechanism of the X-ray foreign material detection apparatus which concern on one embodiment of this invention. It is a timing chart which shows the 1st waveform acquired from the X-ray line sensor of the X-ray foreign material detection apparatus concerning one embodiment of the present invention, and the 2nd waveform.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the configuration will be described.

  As shown in FIG. 1, the X-ray foreign object detection device 1 includes a transport unit 2 and a detection unit 3 inside a housing 4, and a display 5 at the upper front of the housing 4.

  The conveyance unit 2 sequentially conveys the inspection object W at a predetermined interval. This conveyance part 2 is comprised by the belt conveyor arrange | positioned horizontally within the housing | casing 4, for example. The transport unit 2 is driven at a transport speed set in advance by the drive motor 6 shown in FIG. 1, and the inspection object W carried in from the transport inlet 7 is moved to the transport outlet 8 side (X direction in the figure) which is the transport direction. On the other hand, it conveys on the belt surface 2a as an upper conveying surface of the endless belt. A space passing through the belt surface 2 a from the carry-in entrance 7 to the carry-out exit 8 within the housing 4 forms a transport path 21.

  The detection unit 3 irradiates the inspection object W sequentially conveyed with X-rays in the inspection space 22 in the middle of the conveyance path 21 and detects X-rays transmitted through the inspection object W. 21 includes an X-ray generator 9 disposed at a predetermined height above the examination space 22 in the middle of the 21 and an X-ray detector 10 disposed opposite to the X-ray generator 9 in the transport unit 2. Yes.

  An X-ray generator 9 as an X-ray generation source has a configuration in which a cylindrical X-ray tube 30 provided inside a metal box 11 is immersed in insulating oil (not shown). In the present embodiment, two X-ray tubes 31 and 32 are provided as the X-ray tube 30, and an X-ray is generated by irradiating an anode target with an electron beam from the cathodes of the X-ray tubes 31 and 32. .

  The X-ray tubes 31 and 32 are arranged such that the longitudinal direction thereof is the conveyance direction (X direction) of the inspection object W. X-rays generated by the X-ray tubes 31 and 32 are irradiated toward the lower X-ray detector 10 so as to cross the transport direction (X direction) in a substantially triangular screen shape by a slit (not shown). It has become so.

  Here, the intensity of the X-rays generated by the X-ray tubes 31 and 32 changes in proportion to the current (tube current) flowing between the anode and the cathode of the X-ray tubes 31 and 32 and the generated X-rays. Is shortened according to the voltage (tube voltage) applied between the anode and cathode of the X-ray tubes 31 and 32, and the transmission power is increased.

  That is, the quality of X-rays generated from the X-ray tubes 31 and 32 changes according to the tube current and tube voltage of the X-ray tubes 31 and 32. In the present embodiment, the intensity of X-rays generated by the X-ray tube 31 and the intensity of X-rays generated by the X-ray tube 31 are made different. For example, the X-ray tube 31 has a high output (high energy radiation quality). X-ray is output), and the X-ray tube 32 is set to low output (low energy X-ray output is output).

  Note that the intensity of X-rays generated by the X-ray tubes 31 and 32 is not necessarily fixed at a constant value, and the X-ray tube is in accordance with the type of foreign matter to be detected and the inspection object W and the conveyance speed. The tube currents or tube voltages 31 and 32 are adjusted.

  The X-ray detector 10 includes an X-ray line sensor 50 in which a plurality of detection elements are linearly arranged in the Y direction orthogonal to the transport direction on the plane in the transport direction (X direction) of the object W to be transported. ing.

  In the present embodiment, as the X-ray line sensor 50, two X-ray line sensors 51 and 52 are provided in the conveyance direction of the inspection object W, and the X-ray line sensor 51 is irradiated from the high-power X-ray tube 31. Then, a detection signal (density data image) transmitted through the inspection object W is output, and the X-ray line sensor 52 detects the detection signal (density data) irradiated from the high-output X-ray tube 32 and transmitted through the inspection object W. Image).

  Here, in the present embodiment, the X-ray detector 10 converts the detection signals (luminance value data) of the X-ray line sensors 51 and 52 into digital data by a built-in A / D converter (not shown), and density data. The A / D converter is provided outside the X-ray detector 10, or the luminance value data before A / D conversion is output to the subsequent overall control unit 40, etc. However, it is not an essential requirement to convert it into density data that is digital data.

  The X-ray detector 10 including the X-ray line sensors 51 and 52 outputs X-ray image data necessary for determining whether or not foreign matter is mixed in a general control unit 40 (see FIG. 2) described later. Yes.

  As shown in FIG. 2, X-ray shielding shielding curtains 16 are suspended and arranged at a plurality of locations along the conveyance direction (X direction) on the ceiling portion 21 a in the conveyance path 21. The shielding curtain 16 is composed of a rubber sheet mixed with lead powder that shields X-rays and processed into a good shape (a state in which the upper part is connected and the lower part is divided into strips), and is conveyed from the inspection space 22. This prevents X-rays from leaking outside the housing 4 via the path 21.

  In the present embodiment, two shielding curtains 16 are provided between the carry-in entrance 7 and the inspection space 22 and between the examination space 22 and the carry-out exit 8, respectively. Even when a gap is generated due to elastic deformation due to contact with the inspection object W, the other shielding curtain 16 shields X-rays, so that leakage of X-rays can be prevented without exceeding the leakage reference amount.

  Note that a slit is disposed on the upper surface of the inspection space 22, and the lower surface and side surfaces of the inspection space 22 are substantially closed by a housing 4 or the like for shielding X-rays. An inner space surrounded by the shielding curtain 16, the slit, the housing 4, and the like in the transport path 21 constitutes an inspection space 22.

  The X-ray foreign matter detection apparatus 1 includes a comprehensive control unit 40 that performs comprehensive control including determination of the presence or absence of foreign matter in the inspection object W based on density data received from the X-ray detector 10.

  The comprehensive control unit 40 performs comprehensive control of the X-ray foreign matter detection apparatus 1 and detects density data from the X-ray line sensors 51 and 52 and activates the density data at a predetermined timing, respectively. Detection unit 61, 62, storage unit 43 that stores a plurality of density data from data detection units 61, 62, and an image of density data from X-ray line sensors 51, 52 (hereinafter simply referred to as an image) An image processing unit 44 that performs image processing such as composition processing and filter processing, and an image subjected to image processing by the image processing unit 44 is discriminated from the object W to be inspected to determine whether foreign matter is mixed in. And a determination unit 48 for determination. The determination result by the determination unit 48 is displayed on the display 5.

  The data detection unit 60 includes two data detection units 61 and 62 in the present embodiment, and density data input at a predetermined timing with respect to the density data from the X-ray line sensors 51 and 52, that is, a predetermined level. Only data within the range of data validation input timing is validated.

  The storage unit 43 temporarily stores data validated by the data detection units 61 and 62 among the data output from the X-ray line sensors 51 and 52, and can store and read images at high speed. It consists of possible memory.

  The image processing unit 44 performs image processing such as synthesis processing and filter processing on the density data images from the X-ray line sensors 51 and 52.

  The determination unit 48 detects foreign matter from the inspected object W on the image subjected to the image processing by the image processing unit 44, and determines whether foreign matter is mixed.

  The X-ray foreign object detection apparatus 1 also includes a setting unit 49 that performs an X-ray output of the X-ray generator 9, a conveyance speed of the inspection object W, an inspection parameter setting operation of the X-ray detector 10, and a selection operation. The setting unit 49 is arranged next to the display 5 at the upper front of the housing 4.

  As shown in FIGS. 3 and 4, in the present embodiment, the X-ray line sensor 52 is supported by the first support member 71. The first support member 71 is supported by the second support member 72 so that the X-ray line sensor 52 can be displaced upstream and downstream in the transport direction while maintaining parallel to the X-ray line sensor 51.

  Specifically, slide convex portions 71a extending in the transport direction are formed on the lower surfaces of both end portions in the width direction of the first support member 71, and at the upper surfaces of both end portions in the width direction of the second support member 72. A slide recess 72a extending in the transport direction is formed, and the slide locus 71a slides in the slide recess 72a so that the movable locus of the first support member 71 is guided in the transport direction.

  On the downstream side of the first support member 71 in the transport direction, a position adjustment member 74 that contacts the downstream end of the first support member 71 and adjusts the position of the first support member 71 in the transport direction is provided. A compression spring 75 that abuts against the first support member 71 and presses the first support member 71 toward the position adjustment member 74 is provided at the upstream end of the first support member 71.

  The position adjustment member 74 has a mechanism similar to that of a micrometer, and when the adjustment handle 74a is operated, the position of the first support member 71 in the inspection object conveyance direction is adjusted to the upstream side or the downstream side. It has become.

  As shown in FIG. 2, in the present embodiment, the overall control unit 40 determines the adjustment direction (upstream side or downstream side) and the adjustment amount of the first support member 71 in the inspection object conveyance direction. The display 5 displays the determination result of the position adjustment determination unit 92.

  The position adjustment determination unit 92 includes a first waveform (see FIG. 5) that is a waveform in the transport direction of the inspection object W in the first X-ray image data output from the X-ray line sensor 51, and an X-ray line sensor. The second waveform (see FIG. 5) that is the waveform in the transport direction of the inspection object W in the second X-ray image data output from 52 is acquired, and the first waveform and the tip of the second waveform Based on the phase difference of (inclination part), the position adjustment direction and the position adjustment amount of the first support member 71 in the inspection object conveyance direction are determined.

  Here, in the first waveform and the second waveform, a tip portion inclined at a width of about several pixels is generated at the tip of the inspection object W on the waveform. This is because the leading edge is generated because the rising edge of the waveform is not strictly vertical, and is recognized as “blurred” on the image. The width of the tip portion that is “blurred” on the image varies depending on the thickness of the inspection object W, and in the present embodiment, it is assumed that the width is 3 pixels as an example.

  For example, even if the tip is 3 pixels in the first waveform, depending on the distance from the upstream X-ray line sensor 51 to the downstream X-ray line sensor 52, May increase or decrease from 3 pixels.

  This is because the distance between the X-ray line sensor 51 and the X-ray line sensor 52 is not a multiple of the element width (for example, 0.4 mm) in the transport direction of these X-ray line sensors 51 and 52. This is because the time when the tip of the object W passes through the X-ray line sensor 52 and the accumulation start time of the X-ray line sensor 52 do not match.

  The X-ray line sensors 51 and 52 perform accumulation at the same cycle (for example, 1000 Hz) and at the same timing. That is, as shown in FIG. 3, two X-ray line sensors 51 and 52 arranged in parallel are composed of a single X-ray line sensor configured to control at the same control timing, and the control timing is the same. It is preferable that the configuration is as if one X-ray line sensor is folded and arranged in parallel so as to be the timing.

  As shown in FIG. 5, the position adjustment determination unit 92 drives the X-ray line sensor 52 when the rising position of the tip of the second waveform is positioned on the right side because the phase is early by 0.3 pixels. Since the distance between the X-ray line sensor 51 and the X-ray line sensor 52 is short with respect to the period, it is determined that the position adjustment direction of the first support member 71 is on the downstream side in the transport direction.

  The position adjustment determination unit 92 determines that the position adjustment amount is an amount corresponding to 0.3 pixel. The position adjustment amount is obtained from the product of the pixel difference (0.3 pixel) and the conveyance speed. The determination result by the position adjustment determination unit 92 is displayed on the display 5 as, for example, “position adjustment direction: downstream, position adjustment amount: 2 mm”.

  Further, as shown in FIG. 3, a position adjustment member drive motor 82 for driving the position adjustment member 74 is coupled to the adjustment handle 74a, and as shown in FIG. Is provided with a drive control unit 93 for controlling the driving of the motor.

  The drive control unit 93 drives and controls the position adjustment member drive motor 82 according to the position adjustment direction and the position adjustment amount determined by the position adjustment determination unit 92. Further, the position adjustment member drive motor 82 includes a stepping motor that is pulse-driven and a speed reduction mechanism (not shown).

  With this configuration, the drive control unit 93 drives and controls the position adjustment member drive motor 82 in accordance with the determined position adjustment direction and position adjustment amount, and the downstream X-ray supported by the first support member 71. The position of the line sensor 52 in the conveyance direction can be automatically adjusted.

  Note that the X-ray foreign object detection device 1 may be configured such that the user operates the adjustment handle 74a only by displaying the determination result by the position adjustment determination unit 92 on the display 5.

  As described above, the X-ray foreign object detection device 1 according to the present embodiment supports the X-ray line sensor 51 while maintaining a posture parallel to the X-ray line sensor 52, and the inspection object conveyance direction. A first support member 71 configured to be position-adjustable, a position adjustment member 74 for adjusting the position of the first support member 71 with respect to the inspection object conveyance direction, and an inspection object in the first X-ray image data While acquiring the 1st waveform which is a waveform of a conveyance direction, and the 2nd waveform which is a waveform of the to-be-inspected object conveyance direction in 2nd X-ray image data, the 2nd waveform with respect to the front-end | tip part of a 1st waveform A position adjustment determination unit 92 that determines the position adjustment direction and the amount of position adjustment of the first support member 71 based on the phase difference of the tip of the first support member 71, and the display 5 that displays the determination result by the position adjustment determination unit 92. It is characterized by that.

  With this configuration, the position adjustment direction and the amount of position adjustment for reducing the deviation of the X-ray image are determined by the position adjustment determination unit 92 and displayed on the display 5, so that the user operates the position adjustment member 74. Thus, the position of the X-ray line sensor 52 supported by the first support member 71 can be easily adjusted. For this reason, the image shift | offset | difference of two X-ray images obtained by an energy subtraction method can be reduced, and the fall of a foreign material detection performance can be prevented.

  Further, in the X-ray foreign object detection device 1 according to the present embodiment, the position adjustment determination unit 92 determines the first waveform from the difference in the number of pixels at the tip of the second waveform with respect to the number of pixels at the tip of the first waveform. The phase difference of the tip portion of the second waveform with respect to the tip portion of the waveform is obtained.

  With this configuration, the position adjustment determination unit 92 can accurately determine the position adjustment direction and the amount of position adjustment.

  Further, in the X-ray foreign object detection device 1 according to the present embodiment, when the phase of the tip portion of the second waveform is early with respect to the tip portion of the first waveform, the position adjustment direction of the first support member 71 is It is characterized in that it is determined that it is the downstream side in the inspection object conveyance direction.

  With this configuration, the position adjustment determination unit 92 can accurately determine the position adjustment direction.

  Further, in the X-ray foreign object detection device 1 according to the present embodiment, the position adjustment determination unit 92 is a product of the phase difference of the leading end of the second waveform with respect to the leading end of the first waveform and the transport speed of the transport unit 2. The position adjustment amount is determined based on the above.

  With this configuration, the position adjustment determination unit can accurately determine the position adjustment amount.

  In addition, the X-ray foreign object detection device 1 according to the present embodiment has a single X-ray composed of two line sensor units in which the X-ray line sensor 51 and the X-ray line sensor 52 are controlled at the same control timing. It consists of a line line sensor.

  With this configuration, the operation timings of the X-ray line sensor 51 and the X-ray line sensor 52 can be completely synchronized.

  In addition, the X-ray foreign object detection device 1 according to the present embodiment adjusts the position according to the position adjustment member drive motor 82 that drives the position adjustment member 74 and the position adjustment direction and the amount of position adjustment determined by the position adjustment determination unit 92. And a drive control unit 93 that drives and controls the member drive motor 82.

  With this configuration, the drive control unit 93 drives and controls the position adjustment member drive motor 82 in accordance with the position adjustment direction and the amount of position adjustment determined by the position adjustment determination unit 92, so the X-ray line supported by the first support member 71. The position of the sensor 52 can be automatically adjusted.

  As described above, the X-ray foreign object detection device according to the present invention has the effect of reducing the image displacement between two X-ray images obtained by the energy subtraction method and preventing the deterioration of foreign object detection performance, The present invention is useful as an X-ray foreign object detection apparatus that employs an energy subtraction method that obtains an image in which foreign objects are emphasized by synthesizing images from a plurality of X-ray line sensors.

DESCRIPTION OF SYMBOLS 1 X-ray foreign material detection apparatus 2 Conveyance part (conveyance means)
2a Belt surface (conveying surface)
3 Detection unit 4 Housing 5 Display (display means)
9 X-ray generator 10 X-ray detector 21 Transport path 21a Ceiling part 22 Inspection space 30 X-ray tube 31 X-ray tube (first X-ray source)
32 X-ray tube (second X-ray source)
40 general control unit 43 storage unit 44 image processing unit (image composition means)
48 determination part (determination means)
49 Setting unit 51 X-ray line sensor (first X-ray line sensor)
52 X-ray line sensor (second X-ray line sensor)
61, 62 Data detector 71 First support member (support member)
72 Second support member 74 Position adjustment member 74a Adjustment handle 75 Compression spring 82 Position adjustment member drive motor (position adjustment member drive means)
92 Position adjustment determination unit (position adjustment determination means)
93 Drive control unit (drive control means)
W Inspection object

Claims (6)

A transport means for transporting the inspection object in the inspection object transport direction on the transport surface;
A first X-ray source and a second X-ray source that irradiate X-rays having different intensities to the inspection object conveyed on the conveyance surface;
According to the X-rays that are arranged at positions facing the first X-ray source and the second X-ray source across the transport surface and are irradiated from the first X-ray source and pass through the inspection object. A first X-ray line sensor that outputs first X-ray image data and second X-ray image data corresponding to X-rays irradiated from the second X-ray source and transmitted through the inspection object; A second X-ray line sensor;
Image synthesizing means for synthesizing the first X-ray image data and the second X-ray image data and outputting as one image data corresponding to the inspection object;
An X-ray foreign matter detection apparatus comprising: determination means for determining the presence or absence of foreign matter in the inspection object based on image data output by the image composition means;
A support member configured to support the first X-ray line sensor while maintaining a posture parallel to the second X-ray line sensor, and to be position-adjustable in the inspection object conveyance direction;
A position adjustment member that performs an operation of adjusting the position of the support member with respect to the inspection object conveyance direction;
A first waveform that is a waveform in the inspection object conveyance direction in the first X-ray image data and a second waveform that is a waveform in the inspection object conveyance direction in the second X-ray image data are acquired. And a position adjustment determination means for determining a position adjustment direction and a position adjustment amount of the support member based on a phase difference of the tip of the second waveform with respect to the tip of the first waveform,
An X-ray foreign matter detection apparatus comprising: display means for displaying a determination result by the position adjustment determination means.   The position adjustment determination means determines the leading edge of the second waveform relative to the leading edge of the first waveform from the difference in the number of pixels at the leading edge of the second waveform with respect to the number of pixels at the leading edge of the first waveform. The X-ray foreign object detection device according to claim 1, wherein a phase difference of the part is obtained.   When the phase of the tip of the second waveform is earlier than that of the tip of the first waveform, it is determined that the position adjustment direction of the support member is downstream in the object conveyance direction. The X-ray foreign material detection apparatus according to claim 1 or 2.   The position adjustment determination unit determines the position adjustment amount based on a product of a phase difference of the tip of the second waveform with respect to a tip of the first waveform and a transport speed of the transport unit. The X-ray foreign material detection apparatus according to any one of claims 1 to 3.   The first X-ray line sensor and the second X-ray line sensor are composed of a single X-ray line sensor composed of two line sensor units controlled at the same control timing. The X-ray foreign material detection apparatus in any one of Claims 1-4. Position adjusting member driving means for driving the position adjusting member;
6. A drive control means for drivingly controlling the position adjusting member driving means in accordance with a position adjustment direction and a position adjustment amount determined by the position adjustment determining means. The X-ray foreign material detection apparatus of description.

Images