JP2018054431A - X-ray inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray inspection device that can discover adhesion matters on a belt surface of a conveyance belt beforehand.SOLUTION: An X-ray inspection device which irradiates an inspection object W to be conveyed while being placed on a conveyance belt 2a of a conveying machine 2 with an X-ray, and conducts an inspection of the inspection object W on the basis of a transmission image to be acquired from an X-ray detector 4 outputting X-ray transmission data on the X-ray transmitting the inspection object W, comprises: a setting input unit 5 that sets a belt surface abnormality detection mode for detecting abnormality on a belt surface of the conveyance belt 2a from the transmission image of a state where the inspection object W is not placed on the conveyance belt 2a; and a signal processing unit 6 that controls the conveying machine 2 so that the conveyance belt 2a rotates for a prescribed time when the belt surface abnormality detection mode is input by the setting input unit 5, and determines presence/no presence of the abnormality on the belt surface of the conveyance belt 2a.SELECTED DRAWING: Figure 1

Description

  The present invention irradiates an object to be transported with X-rays and uses the X-ray transmission amount when the X-rays are irradiated, for example, whether foreign matter is mixed, whether there is a seal portion defect, whether there is a missing item, etc. The present invention relates to an X-ray inspection apparatus that performs inspection.

  X-ray inspection equipment irradiates X-rays on objects to be inspected (for example, raw meat, fish, processed foods, medicines, etc.) that are sequentially transported on the product line, and the amount of X-ray transmission when the X-rays are irradiated Conventionally known as an apparatus for inspecting the presence or absence of foreign matter in a test object, the presence or absence of a defective seal portion, the presence or absence of a missing part, etc.

  In this type of X-ray inspection apparatus, when an object to be inspected is transported by using a transport belt in the transport section, dust, dirt, debris, water droplets, etc. adhere to the belt surface of the transport belt, and these are still attached. When the inspection object is inspected, the adhered object affects the normal inspection. Therefore, in order to remove the deposits on the belt surface of the conveying unit, a configuration is adopted in which the conveying unit can be cleaned as disclosed in, for example, Patent Document 1 and Patent Document 2 below. In the X-ray inspection apparatus of Patent Document 1, the storage box in which the X-ray detection unit is stored and the transport unit is arranged can be pulled out from the apparatus housing on which the X-ray generation unit is supported, and the storage box is pulled out. The cleaning water and the dirt for cleaning the transport unit at the above position flow down without staying at the site of the transport unit so that the cleaning can be appropriately performed. Further, the X-ray inspection apparatus disclosed in Patent Document 2 is configured to support the conveyance unit with a cantilever frame so that the belt and the like of the conveyance unit can be easily taken out and cleaned.

JP 2004-069386 A Japanese Patent Laid-Open No. 11-183407

  However, the cleaning of the belt surface of the transport unit in this type of X-ray inspection apparatus is performed by the operator before or after the start of the X-ray inspection, but the operator grasps the position of the deposit on the belt surface. Not always done, there are individual differences in cleaning work. In addition, deposits such as dust, dirt, debris, and water droplets are not necessarily attached only to the surface side of the belt surface on which the object to be inspected is conveyed, and may also adhere to the back surface side of the belt surface. For this reason, even if the intention is to clean the entire belt surface, the deposit may remain on a part of the belt surface depending on the type of the deposit and the degree of the deposit.

  When the X-ray inspection is started with the adhered matter remaining on the belt surface, the adhered matter causes a misjudgment of the X-ray inspection, and a normal inspection cannot be performed. For this reason, when cleaning a conveyance part, the structure which can discover the deposit | attachment of the belt surface of a conveyance belt in advance was desired.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide an X-ray inspection apparatus capable of finding in advance deposits on the belt surface of the conveyor belt.

In order to achieve the above object, an X-ray inspection apparatus according to claim 1 of the present invention irradiates an object to be inspected W placed and transported on the transport belt 2a of the transport apparatus 2 with X-rays, In the X-ray inspection apparatus 1 that inspects the inspection object based on a transmission image acquired from the X-ray detector 4 that outputs X-ray transmission data of X-rays transmitted through the inspection object.
A setting input unit 5 for setting a belt surface abnormality detection mode for detecting abnormality of the belt surface of the conveyance belt from a transmission image in a state where the inspection object is not placed on the conveyance belt;
When the belt surface abnormality detection mode is set in the setting input unit, a signal for controlling the conveying device so that the conveying belt rotates for a predetermined time and determining whether there is an abnormality in the belt surface of the conveying belt And a processing unit 6.

The X-ray inspection apparatus according to claim 2 is the X-ray inspection apparatus according to claim 1,
When the signal processing unit detects an abnormality of the belt surface of the conveyor belt, the signal processing unit displays an image including the abnormal part on the display unit 7.

The X-ray inspection apparatus according to claim 3 is the X-ray inspection apparatus according to claim 1 or 2,
The signal processing unit updates and displays a predetermined section of the image in conjunction with the operation of the transport belt.

The X-ray inspection apparatus according to claim 4 is the X-ray inspection apparatus according to claim 2 or 3,
The signal processing unit displays on the display unit an image of a length that the conveyor belt makes one rotation.

The X-ray inspection apparatus according to claim 5 is the X-ray inspection apparatus according to any one of claims 2 to 4,
The signal processing unit is configured to link the display position of the image with the operation of the conveyor belt when the conveyor belt is moved.

The X-ray inspection apparatus according to claim 6 is the X-ray inspection apparatus according to any one of claims 1 to 5,
The signal processing unit determines whether the density level of the X-ray transmission data exceeds a detection limit value when the tube voltage output and the conveyance speed are lower than the inspection of the inspection object. It is characterized by determining the presence or absence of an abnormality.

  According to the X-ray inspection apparatus of the present invention, the conveyance device is controlled so that the conveyance belt rotates for a predetermined time, and the presence / absence of abnormality of the belt surface of the conveyance belt is determined, thereby causing erroneous determination of the X-ray inspection. Deposits on the belt surface can be detected in advance. In addition, the position of the deposit can be confirmed and confirmed on the display.

It is a block diagram which shows schematic structure of the X-ray inspection apparatus which concerns on this invention. (A), (b) It is a figure which shows an example of the display screen before and behind operation | movement of a conveyance belt when operating a conveyance belt automatically for the predetermined time. (A), (b) It is a figure which shows an example of the display screen before and behind the operation | movement of a conveyance belt when moving a conveyance belt. (A), (b) It is a figure which shows an example of the display screen by the single-sided display for the belt length of a conveyance belt. (A), (b) It is a figure which shows an example of the display screen by the single-sided display for the belt length of the conveyance belt before and behind the operation | movement of a conveyance belt. (A) It is a figure which shows an example of a display screen when the length for one rotation of a conveyance belt is divided | segmented into the upper surface and the lower surface, and the two-dimensional display image is displayed. (B) It is a figure which shows an example of the display screen when the adhesion thing of the upper surface and lower surface of a conveyance belt is identified and displayed at the belt surface abnormality detection mode.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  The X-ray inspection apparatus according to the present invention is, for example, incorporated in a part of a transport line, irradiates an inspection object (article) sequentially transported at regular intervals, and irradiates the X-ray. Predetermined inspection of the object to be inspected using the amount of X-ray transmission (for example, presence or absence of foreign matter in the object to be inspected, presence or absence of defective seal due to biting of the contents packed in the packaging material into the seal part, contents Etc.).

  As shown in FIG. 1, the X-ray inspection apparatus 1 of the present embodiment includes a transport device 2, an X-ray generator 3, an X-ray detector 4, a setting input unit 5, a signal processing unit 6, and a display unit 7. It is roughly composed of.

  The conveyance device 2 sequentially conveys the inspection object W to be inspected at predetermined intervals on the conveyance path, and is composed of, for example, a belt conveyor disposed horizontally with respect to the apparatus main body.

  The belt conveyor 2 as a transport device includes a transport belt 2a made of a material that easily transmits X-rays (an element other than an element having a large atomic weight).

  The belt conveyor 2 is in a belt surface abnormality detection mode in which an abnormality of the belt surface of the conveyor belt 2a is detected in a state where the inspection object W is not conveyed, that is, in a state where the inspection object W is not placed on the conveyor belt 2a. The transport belt 2a is moved for a predetermined time (at least a time during which the transport belt 2a makes one rotation) at a transport speed preset by the setting input unit 5 by the rotation of the drive motor M based on the control of the transport control means 6c described later.

  Further, the belt conveyor 2 conveys at a conveyance speed set in advance by the setting input unit 5 by the rotation of the drive motor M based on the control of the conveyance control means 6c described later in the operation mode in which the inspection object W is inspected. The belt 2a is moved, and the inspection object W carried from the carry-in port is conveyed in the conveyance direction X of FIG.

  The X-ray generator 3 irradiates X-rays to the inspection object W transported on the transport path in the transport direction X from the carry-in entrance to the carry-out exit. The X-ray generator 3 applies electrons accelerated by applying a voltage. It has a cylindrical X-ray tube that generates X-rays by projecting, and an irradiation slit for irradiating the X-rays generated by the X-ray tube toward the X-ray detector 4.

  An X-ray tube has a structure in which, for example, a cylindrical X-ray tube provided inside a metal box is immersed in insulating oil, and an X-ray is emitted by irradiating an anode target with an electron beam from the cathode of the X-ray tube. Generate. The X-ray tube is provided in a direction in which the longitudinal direction is orthogonal to the plane of the conveyance direction (X direction in FIG. 1) of the inspection object W, and the generated X-ray is directed toward the lower X-ray detector 4. The screen is irradiated with an irradiation slit along the longitudinal direction.

  The X-ray detector 4 has a plurality of elements arranged in a straight line in a direction perpendicular to the transport direction X on the plane of the transport direction X of the object W to be transported, and is aligned in a line. A plurality of photodiodes arranged and a scintillator provided on the line-shaped photodiode are configured in an array.

  The X-ray detector 4 detects X-rays transmitted through the conveyor belt 2a in the belt surface abnormality detection mode by a plurality of elements (array of photodiodes and scintillators), and detects the inspection object W and the conveyor belt 2a in the operation mode. Transmitted X-rays are detected, and the detected data is sequentially output with a plurality of elements as one line for each element.

  The setting input unit 5 includes, for example, keys, push buttons, switches, and soft keys on the display screen of the display unit 7 provided in the apparatus main body. The setting input unit 5 includes a belt surface abnormality detection mode for detecting an abnormality of the belt surface of the conveyance belt 2a from a transmission image in a state where the inspection object W is not placed on the conveyance belt 2a of the conveyance device 2, and the conveyance device. The operation mode is set to any one of the operation modes in which the inspection object W is inspected from the transmission image in a state where the inspection object W is placed on the second conveyor belt 2a and the inspection object W is conveyed. .

  The setting input unit 5 appropriately sets inspection parameters (the tube voltage output of the X-ray generator 3, the transport speed of the transport belt 2a of the transport device 2, and the detection limit value) according to the operation mode. That is, when the belt surface abnormality detection mode is set as the operation mode, the tube voltage output of the X-ray generator 3 transmits X-rays to suppress the heat generation of the X-ray source and detect the belt surface abnormality. It is set to a low voltage that is difficult, and the conveyance speed of the conveyance belt 2a of the conveyance device 2 is set to be lower than that in the operation mode, and abnormality of the belt surface of the conveyance belt 2a due to adhering matters such as dust, dirt, debris, and water droplets is detected. A detection limit value (for example, Vth in FIG. 2B or FIG. 3B) is set in accordance with the type of deposit.

  Further, when the operation mode is set as the operation mode, the tube voltage output of the X-ray generator 3 is set to a higher voltage than in the belt surface abnormality detection mode, and the conveyance speed of the conveyance belt 2a of the conveyance device 2 is set to the belt. It is set according to the type and inspection content of the inspection object W at a higher speed than in the surface abnormality detection mode, and the inspection content such as the type of inspection object and the type of foreign matter (whether foreign matter is mixed in the inspection object W, A detection limit value is set according to the presence or absence of a sealing failure in the seal portion of the inspection object W and the inspection of whether or not the contents in the inspection object W are missing.

  When inspecting the presence or absence of a seal failure of the inspection object W, the width dimension of the seal portion of the inspection object W (for example, if the outer shape is rectangular, the dimension is directed from the four sides of the outer shape to the inside), the seal The setting input unit 5 is operated when setting various kinds of information related to the seal portion such as the number of portions having the portion.

  The signal processing unit 6 includes a storage unit 6a, a mode determination unit 6b, a conveyance control unit 6c, an abnormality determination unit 6d, an inspection unit 6e, and a display control unit 6f.

  The storage means 6a updates and stores X-ray transmission data of a predetermined section based on detection data from the X-ray detector 4 at a predetermined period in the belt surface abnormality detection mode. Alternatively, X-ray transmission data based on the detection data from the X-ray detector 4 is stored only while the transport belt 2a is moving. The X-ray transmission data at this time is obtained by A / D converting the detection data from the X-ray detector 4 by an A / D converter (not shown).

  The predetermined section means, for example, a section corresponding to the number of lines of detection data (for example, 100 lines) detected by the X-ray detector 4, a section corresponding to the length of one rotation of the transport belt 2a, and the like. The predetermined cycle means, for example, a time for which the transport belt 2a rotates once or a plurality of times, a specified time such as 30 seconds or 1 minute, and the like.

  The storage means 6a stores X-ray transmission data for each inspection object W based on detection data from the X-ray detector 4 in the operation mode. Specifically, every time an inspection object W is inspected, for example, several hundred pieces of X-ray transmission data per line (Y direction) of the X-ray detector 4 are at least conveyed. A predetermined number of lines (for example, several hundred lines) corresponding to the length in the transport direction (corresponding to a detection period from the front end to the rear end) is stored.

  The mode discriminating means 6b discriminates whether the operation mode set by the setting input unit 5 is the belt surface abnormality detection mode or the operation mode, and determines the transport belt 2a of the transport device 2 according to the transport conditions and transport speed of the determined mode. A drive control signal for drive control is output to the conveyance control means 6c.

  The conveyance control means 6c controls the drive motor M in the normal or reverse rotation based on the drive control signal from the mode determination means 6b based on the conveyance conditions and the conveyance speed set by the setting input unit 5.

  In the belt surface abnormality detection mode, the conveyance control unit 6c controls the conveyance device 2 so that the conveyance belt 2a is moved by the drive motor M for a predetermined time (at least a time during which the conveyance belt 2a is rotated once). Further, when the conveyance control unit 6c is operating the conveyance belt 2a, if the abnormality determination unit 6d detects an abnormality of the belt surface, the conveyance control unit 6c performs stop control of the drive motor M so that the conveyance belt 2a stops.

  Further, in the operation mode, the conveyance control means 6c causes the conveyance belt 2a to advance in the conveyance direction X by the drive motor M so that the inspection object W passes over the X-ray detector 4 and is conveyed in the conveyance direction X. The transport device 2 is controlled.

  In the belt surface abnormality detection mode, the abnormality determination unit 6d detects whether there is an abnormality in the belt surface of the conveyance belt 2a from the X-ray transmission data stored in the storage unit 6a after the conveyance belt 2a is operated for a predetermined time by the conveyance control unit 6c. And the determination result is output to the display control means 6f.

  The inspection means 6e performs a predetermined inspection on the inspection object W based on the X-ray transmission data output from the X-ray detector 4 corresponding to the X-ray detected by each element of the X-ray detector 4. The selection signal is output to the outside, and the inspection result (discrimination result) is output to the display control means 6f. The inspection unit 6e includes, for example, a foreign matter determination unit, a seal unit failure determination unit, and a missing item determination unit when inspecting the presence / absence of foreign matters, the presence / absence of a seal portion defect, and the presence / absence of a missing item.

  The foreign matter discriminating means discriminates, as a foreign matter, a portion where the density level of the X-ray transmission data is different from the others in the content region of the inspection object W, and outputs a selection signal indicating the presence of foreign matter to the outside. The determination result is output to the display control means 6f.

  The seal portion defect determination means extracts the outer region of the inspection object W (region indicating the inner area from the contour of the inspection object) from the entire image based on the X-ray transmission data, and calculates the seal portion region from the extracted outer region. Then, the presence / absence of a seal failure is determined based on whether or not the contents of the inspection object W exist in the seal area, and a sorting signal indicating the seal failure is output to the outside and the determination result is output to the display control means 6f. To do.

  The missing item determination means determines the presence or absence of a missing item by comparing the density level in the missing item detection area of the contents area of the inspection object W with a preset value, and outputs a selection signal indicating the presence of a missing item. At the same time, the determination result is output to the display control means 6f.

  The determination by each means is performed using the foreign substance detection limit value, the seal portion defect detection limit value, and the missing part detection limit value, and these values are set according to the contents of each inspection object. Setting can be input from the input unit 5 as appropriate.

  Further, the inspection unit 6e may prohibit the inspection of the inspection object W by the X-ray transmission data when the abnormality determination unit 6d detects the abnormality of the belt surface of the transport belt 2a.

  The display control means 6f includes input information from the setting input unit 5 (information on the inspection object W, conveyance speed, detection limit value), X-ray transmission data from the X-ray detector 4 (via the storage means 6a), The determination result from the abnormality determination unit 6d and the inspection result (discrimination result) from the inspection unit 6e are processed to control the display on the display unit 7.

  The display unit 7 is configured by a display device such as a liquid crystal display controlled by the display control means 6f.

  In the belt surface abnormality detection mode, the display unit 7 is a predetermined level including a density level corresponding to the current X-ray transmission amount of one line of the X-ray detector 4 as shown in FIGS. X-ray transmission data images of sections, images and information relating to belt surface abnormalities such as images of the conveyor belt 2a (plan view image, side view image) as shown in FIGS. It is displayed on the display screen by the control of 6f.

  Further, when the conveyor belt 2a is moved or operated for a predetermined time in the belt surface abnormality detection mode, the display unit 7 displays an X-ray transmission data image of a predetermined section on the display screen of FIGS. 2 to 6 and the conveyor belt 2a. The display control means 6f controls the display position of the planar view image and the side view image to be changed in conjunction with the operation of the transport belt 2a.

  Further, the display unit 7 displays an entire image of the inspection object W, an image of the outer region, an image of the seal part region, an X-ray transmission image obtained by planarly viewing the inspection object W based on the determination result, and “OK”. Or “NG” pass / fail judgment results, inspection result information such as the total number of inspections, the number of non-defective products, and the total number of NGs are displayed on the display screen under the control of the display control means 6f.

  Next, an operation when the X-ray inspection apparatus 1 configured as described above detects abnormality of the belt surface of the conveyor belt 2a will be described.

  When detecting the abnormality of the belt surface of the conveyor belt 2a, the operation mode is set to the belt surface abnormality detection mode by the setting input unit 5. In this belt surface abnormality detection mode, the tube voltage output of the X-ray generator 3 is set to a low voltage, the conveyance speed of the conveyance belt 2a is set to be lower than that in the operation mode, and an abnormality of the belt surface due to adhered matter is detected. The detection limit value is set for

  Then, the belt surface abnormality detection in the belt surface abnormality detection mode is performed by automatically operating the conveyance belt 2a for a predetermined time, and the conveyance belt 2a is moved by key operation of the setting input unit 5. There is a way to do it.

  First, a method for automatically detecting the belt surface of the conveyor belt 2a by operating the conveyor belt 2a for a predetermined time will be described with reference to FIGS. 2 (a) and 2 (b). A dotted reference line C in FIGS. 2A and 2B is a virtual center line in the line direction of the detection surface of the X-ray detector 4 perpendicular to the transport direction X.

  When the operation mode is set to the belt surface abnormality detection mode in the setting input unit 5 and the automatic operation key 5a displayed as a soft key of the setting input unit 5 is pressed on the display screen of FIG. The conveyance control means 6c controls the rotation of the drive motor M so as to automatically operate for a predetermined time (at least the time when the conveyance belt 2a makes one rotation).

  When X-rays from the X-ray generator 3 pass through the conveyor belt 2a and are detected by the X-ray detector 4 along with the operation of the conveyor belt 2a, as shown in FIG. As a display, the density level of the X-ray transmission data by the current X-ray detector 4 and the X-ray transmission data of a predetermined number of lines before and after the current X-ray transmission data as the center (reference line C in FIG. 2A). Are displayed on the display screen of the display unit 7.

  If the density level of the X-ray transmission data by the X-ray detector 4 includes a density level exceeding the detection limit value Vth, the abnormality determination means 6d determines that there is an abnormality due to the deposit F on the belt surface, and the conveyance The control means 6c stops the drive motor M and stops the operation of the transport belt 2a. In this state, the conveyor belt 2a does not stop immediately but stops at a position where the deposit F on the belt surface passes over the X-ray detector 4.

  Therefore, the conveyance control means 6c performs stop control of the drive motor M to stop the conveyance belt 2a, and then reverses the drive motor M, so that the deposit F on the belt surface is removed as shown in the display screen of FIG. The conveyor belt 2a is moved by a predetermined amount so as to be positioned near the reference line C in FIG. 2, that is, within the detection range of the X-ray detector 4. As a result, it can be seen that the deposit F on the belt surface is in the vicinity of just above the X-ray detector 4, and the conveyance belt 2 a can be cleaned after the position of the deposit F is grasped.

  Note that the operation amount of the conveyor belt 2a when the drive motor M is reversed is obtained in advance from the braking time, braking distance, etc. of the brake of the drive motor M, and is previously stored as information when the drive motor M is reversed. Store in 6a.

  In this way, the conveyance control means 6c operates the conveyance belt 2a to stop the drive motor M when there is a light / dark level exceeding the detection limit value Vth, and the adhering matter F is the reference line in FIG. The drive motor M is reversely controlled so as to be in the vicinity of C and controlled to stop. The conveyance control unit 6c sets the time until the conveyance belt 2a makes one rotation as the above-described predetermined time, and performs the above-described control until the predetermined time is reached every time there is a light / dark level exceeding the detection limit value Vth. You can also. In that case, the automatic operation can be resumed from the stopped state by using the automatic operation key 5a displayed as the soft key in FIG.

  Next, a method for detecting abnormality of the belt surface of the conveyor belt 2a by moving the conveyor belt 2a by key operation of the setting input unit 5 will be described with reference to FIGS. 3A and 3B, the dotted reference line C is the line direction of the detection surface of the X-ray detector 4 that is perpendicular to the transport direction X, as in FIGS. 2A and 2B. The virtual center line.

  When the belt surface abnormality detection mode is set by the setting input unit 5, the conveyance belt is pressed every time the arrow key 5b (or 5c) displayed as a soft key of the setting input unit 5 is pressed on the display screen of FIG. The conveyance control means 6c controls the rotation of the drive motor M for a short time such that the movement of the conveyance belt 2a is only a little, and moves the conveyance belt 2a. The inching may be controlled so that the drive motor M is rotated only while the arrow key 5b (or 5c) is being pressed.

  When the X-ray from the X-ray generator 3 passes through the conveyor belt 2a and is detected by the X-ray detector 4 along with the inching of the conveyor belt 2a, as shown in the display screen of FIG. As the belt surface monitoring display, the density level of the X-ray transmission data by the current X-ray detector 4 and a predetermined number of lines before and after the center of the current X-ray transmission data (reference line C in FIG. 3A) are displayed. The X-ray transmission data is displayed on the display screen of the display unit 7.

  Then, as shown in the display screen of FIG. 3B, due to the inching of the conveyor belt 2a, the deposit F on the belt surface is detected near the center line C of FIG. 3B, that is, detected by the X-ray detector 4. When the display is located within the range and the density level of the X-ray transmission data by the X-ray detector 4 exceeds the detection limit value Vth, the pressing of the arrow key 5b (or 5c) is stopped. As a result, it can be seen that the deposit F on the belt surface is in the vicinity of just above the X-ray detector 4, and the conveyance belt 2 a can be cleaned after the position of the deposit F is grasped.

  In detecting the abnormality of the belt surface of the conveyor belt 2a by moving the conveyor belt 2a, after the belt surface abnormality detection mode is set, the conveyor belt 2a is rotated for a predetermined time (at least the conveyor belt 2a makes one rotation). The conveyance control means 6c may control the rotation of the drive motor M so that the abnormality determination means 6d automatically operates until it is determined that the deposit F is present. In this case, when the abnormality determining means 6d determines that there is the deposit F, the operation of the conveyor belt 2a stops and the display screen shown in FIG. 3A is displayed. From the display screen shown in FIG. The conveyor belt 2a is moved by operating the arrow key 5b (or 5c) until the deposit F on the belt surface is within the detection range of the X-ray detector 4 so that the display screen shown in FIG.

  Thus, if the method of automatically operating the conveyor belt 2a and the method of moving the conveyor belt 2a are used in combination, the deposit F on the belt surface is positioned within the detection range of the X-ray detector 4. The conveyor belt 2a can be moved, and the deposit F on the belt surface is easy to find.

  By the way, the above-described abnormality detection of the belt surface is preferably performed after the dark current correction before the sensitivity correction of each element of the X-ray detector 4 in order to eliminate the influence of errors such as dust on the sensitivity correction. In this case, one detection limit value is reflected on each element of the X-ray detector 4 to determine whether or not the belt surface is abnormally detected.

  In addition, when detecting abnormality of the belt surface after correcting the sensitivity of the X-ray detector 4, a detection limit value is set for each element of the X-ray detector 4 according to the X-ray radiation angle, and the belt surface Judgment of abnormality detection is performed.

  Further, in the belt surface abnormality detection mode, it is preferable to control the transport belt 2a by rotating the drive motor M in the reverse direction so as to advance in the direction opposite to the transport direction X in the operation mode. As a result, for example, when an operator inadvertently loads an uninspected object on the transport belt during the belt surface abnormality detection mode, or an uninspected object W exists on the transport belt 2a. Even in this case, the inspection object W does not pass through the X-ray detector 4 and is not transported to the carry-out side without being inspected.

  In the above-described abnormality detection of the belt surface of the conveyor belt 2a, the density level of the X-ray transmission data by the current X-ray detector 4 and the current X-ray transmission data are centered as the belt surface monitoring display of the conveyor belt 2a. The case where X-ray transmission data of a predetermined line before and after is displayed as a belt surface monitoring display has been described as an example. However, the present invention is not limited to this, and X-ray transmission at least when the transport belt 2a is rotated once. The belt surface monitoring display shown in FIGS. 4 to 6 may be adopted based on the data.

  FIGS. 4A and 4B are diagrams illustrating an example of a display screen including a belt surface monitoring display when one-side display for the belt length of the transport belt 2a is performed in the belt surface abnormality detection mode.

  In the display screens of FIGS. 4A and 4B, the belt surface monitoring display includes a planar view image of one side (upper surface or lower surface) of the conveyor belt 2a including the deposit F and the deposit F. A side view image of the conveyor belt 2a is displayed side by side. 4 (a) and 4 (b) show a state in which two deposits F1 and F2 are displayed on the upper surface of the conveyor belt 2a and one deposit F3 is displayed on the lower surface of the conveyor belt 2a. Yes.

  On the right side of the display screen, for example, inspection information such as the type of the inspection object W, the conveyance speed of the conveyance belt 2a, the total number of inspections of the inspection object W, the number of non-defective products (OK), the number of defective products (NG), and the like are displayed. The Also, at the lower end of the display screen, there are arrow keys 5b and 5c for instructing the inching movement of the conveyor belt 2a, a lower surface image key 5d for switching the planar view image of the conveyor belt 2a to the upper surface or the lower surface, and an upper image key. Various soft keys including 5e are displayed.

  Then, when the lower surface image key 5d is pressed in a state where the upper surface plan image of the belt length of the conveyor belt 2a including the deposit F in FIG. 4A is displayed, as shown in FIG. The display is switched to a planar view image of the lower surface of the belt length of the conveyor belt 2a including the deposit F. Thereby, the position of the deposit F is confirmed over the entire belt surface of the conveyor belt 2a only by operating the screen switching soft keys (the lower surface image key 5d and the upper surface image key 5e) displayed on the display screen. be able to.

  5A and 5B show a one-side display for the belt length of the conveyor belt 2a in the belt surface abnormality detection mode, and a belt surface monitoring display when the conveyor belt 2a is moved by key operation of the setting input unit 5. It is a figure which shows an example of the display screen containing.

  On the display screens of FIGS. 5A and 5B, as a belt surface monitoring display, a planar view image and a side view image of one side (for example, the upper surface) of the conveyor belt 2 a are displayed side by side. When the arrow keys 5b and 5c are operated on the display screen of FIG. 5A, the conveyor belt 2a is moved only while the arrow keys 5b and 5c are operated, and the display screen of FIG. 5B is displayed. As shown, the display position of the deposit F on the belt surface changes in accordance with the movement of the conveyor belt 2a. That is, on the display screen of FIG. 5A, two deposits F1 and F2 are displayed in a plan view image of the upper surface of the transport belt 2a, and the display of FIG. 5B is performed by moving the transport belt 2a. On the screen, in addition to the two deposits F1 and F2, the deposit F3 that was present on the lower surface of the transport belt 2a before the transport belt 2a is displayed is displayed together with the top view image of the transport belt 2a. .

  Next, FIG. 6A shows a display screen including a belt surface monitoring display when the length of one rotation of the conveyor belt 2a is divided into an upper surface and a lower surface and two-dimensional images are displayed in the belt surface abnormality detection mode. It is a figure which shows an example.

  In the display screen of FIG. 6A, when the double-sided image key 5f displayed as a soft key of the setting input unit 5 is pressed, a plan view image of the top surface of the transport belt 2a is displayed with the side view image of the transport belt 2a as the center. The planar view image of the lower surface of the conveyor belt 2a is displayed side by side. Thereby, the position of the deposit | attachment F of the conveyance belt 2a can be confirmed over the whole surface of the conveyance belt 2a.

  Next, FIG. 6B is a diagram illustrating an example of a display screen including a belt surface monitoring display when the adhered matter on the upper surface and the lower surface of the transport belt 2a is identified and displayed in the belt surface abnormality detection mode.

  In the display screen of FIG. 6B, when the identification display key 5g displayed as a soft key of the setting input unit 5 is pressed, a planar view image and a side view image of one side (for example, the top surface) of the conveyor belt 2a are vertically moved. Displayed side by side, with respect to a planar view image of one side (upper surface) of the conveyor belt 2a, the deposits F1, F2 on the upper surface of the conveyor belt 2a and the deposit F3 on the lower surface of the conveyor belt 2a are identified (for example, color-coded). The

  As described above, in the X-ray inspection apparatus 1 of the present embodiment, the belt surface abnormality detection mode is set by the setting input unit 5, and the inspection object W is placed on the conveyor belt 2a in the belt surface abnormality detection mode. The density level of the X-ray transmission data when the conveyance device 2 is controlled so as to rotate for a predetermined time without being placed and the tube voltage output and the conveyance speed are lower than the inspection of the inspection object W is the detection limit value. Whether or not there is an abnormality in the belt surface of the conveyance belt 2a (abnormality due to adhesion of dust, dirt, debris, water droplets, etc.) is determined. When an abnormality of the belt surface of the conveyor belt 2a is detected, an image including the abnormal part is displayed on the display unit 7. Thereby, when cleaning the conveyance belt 2a, the operator can discover in advance an abnormal portion due to the deposit on the belt surface of the conveyance belt 2a by checking the image on the display unit 7 and grasp the position thereof. it can. Then, the operator can clean the transport belt 2a cleanly so that no deposit remains on the belt surface after grasping the position of the abnormal part.

  Moreover, since the image of the length which the conveyance belt 2a makes one rotation is displayed on the display part 7, the presence or absence of the abnormality by a deposit | attachment can be discriminate | determined over the whole belt surface of the conveyance belt 2a.

  Further, if the configuration is such that the conveyor belt 2a is automatically operated in the belt surface abnormality detection mode and the display position of the image is linked to the operation of the conveyor belt 2a, the operator can simply display the display unit without performing any special operation. It is possible to recognize an abnormal portion of the belt surface of the conveyor belt 2a only by confirming the image 7.

  Further, in the belt surface abnormality detection mode, if the conveyor belt 2a is moved and the display position of the image is interlocked with the operation of the conveyor belt 2a, the operator himself / herself can operate the conveyor belt by operating the setting input unit 5. By checking the image on the display unit 7 while moving 2a, it is possible to find out whether there is an abnormality in the belt surface.

  In the above-described embodiment, the case where the position of the deposit F on the surface (conveying surface) side of the conveying belt 2a to which the inspection object W is conveyed is described as an example. Since the position of the deposit is specified using the X-ray transmission data when the line passes through the transport belt 2a, the position of the deposit on the back side of the belt surface can be found in advance by the same configuration and method. it can.

  The best mode of the X-ray inspection apparatus according to the present invention has been described above, but the present invention is not limited by the description and drawings according to this mode. That is, it is a matter of course that all other forms, examples, operation techniques, and the like made by those skilled in the art based on this form are included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 X-ray inspection apparatus 2 Conveyance apparatus 2a Conveyor belt 3 X-ray generator 4 X-ray detector 5 Setting input part 5a Automatic operation key 5b, 5c Arrow key 5d Bottom image key 5e Top image key 5f Double-sided image key 5g Identification display key 6 Signal Processing Unit 6a Storage Unit 6b Mode Determination Unit 6c Transport Control Unit 6d Abnormality Determination Unit 6e Inspection Unit 6f Display Control Unit 7 Display Unit C Reference Line F (F1, F2, F3) Adherence M Drive Motor Vth Detection of Adherence Limit value W Inspected object

Claims (6)

The inspection object (W) placed and transported on the transport belt (2a) of the transport device (2) is irradiated with X-rays, and X-ray transmission data of X-rays passing through the inspection object is output. In the X-ray inspection apparatus (1) for inspecting the inspection object based on the transmission image acquired from the X-ray detector (4),
A setting input unit (5) for setting a belt surface abnormality detection mode for detecting abnormality of the belt surface of the conveyance belt from a transmission image in a state where the inspection object is not placed on the conveyance belt;
When the belt surface abnormality detection mode is set in the setting input unit, a signal for controlling the conveying device so that the conveying belt rotates for a predetermined time and determining whether there is an abnormality in the belt surface of the conveying belt An X-ray inspection apparatus comprising a processing unit (6). 2. The X-ray inspection apparatus according to claim 1, wherein when the abnormality of the belt surface of the conveyor belt is detected, the signal processing unit displays an image including the abnormal part on the display unit (7). The X-ray inspection apparatus according to claim 1, wherein the signal processing unit updates and displays a predetermined section of the image in conjunction with the operation of the conveyor belt. The X-ray inspection apparatus according to claim 2, wherein the signal processing unit displays an image having a length of one rotation of the conveyor belt on the display unit. The X-ray inspection apparatus according to claim 2, wherein the signal processing unit interlocks the display position of the image with the operation of the transport belt when the transport belt is moved. . The signal processing unit determines whether the density level of the X-ray transmission data exceeds a detection limit value when the tube voltage output and the conveyance speed are lower than the inspection of the inspection object. The X-ray inspection apparatus according to claim 1, wherein presence / absence of abnormality is determined.

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