X-ray inspection equipment

Abstract

To provide an X-ray inspection device with which it is possible to effectively prevent X-rays from leaking out via an X-ray shield door without having to install a protrusion at a lower end of the X-ray shield door.SOLUTION: An X-ray inspection device 1 comprises an X-ray irradiation unit 6, a conveyance unit 5, an X-ray detection unit 7, and an X-ray shield door 20. The X-ray shield door 20 is arranged on one side of the conveyance unit 5 in a width direction Y which is orthogonal to both article A conveyance direction X and the vertical direction Z, releasing an irradiation space R open in an open state and preventing the leakage of X-rays from the irradiation space R in a closed state. As viewed from the conveyance direction X in the closed state, an inclined part 60 which is inclined downward from one end toward the other end in the width direction Y is formed in at least a portion of an inner surface 21 of the X-ray shield door, with an inclined lower end 62 in the inclined part 60 being positioned, in the closed state, closer to the other side in the width direction Y than is the position of an end 5E on one side of the conveyance part 5 in the width direction Y.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an X-ray inspection apparatus. [Background technology]

[0002] In production lines for products such as food, for example, inspections are carried out to check for the presence of foreign objects inside product packages. For such inspections, an X-ray inspection device is used, in which X-rays are irradiated onto products continuously conveyed on a transport conveyor, and the condition of the products is determined based on the amount of transmitted X-rays detected by a line sensor or the like. Such X-ray inspection devices are provided with an X-ray shielding section (shielding box) that prevents X-rays from leaking from the X-ray irradiation space. In addition, an X-ray shielding door is provided in a part of the X-ray shielding section, allowing access to the X-ray irradiation space from outside the X-ray shielding section. When the X-ray shielding door is closed, it prevents X-rays from leaking, and when it is open, it allows workers to perform maintenance work, such as cleaning each component in the X-ray irradiation space.

[0003] Patent Document 1 discloses an X-ray shielding door that includes a main body and side walls (projections) that are bent toward the X-ray irradiation space from the periphery of the main body as a base end and are made up of an upper wall, a left wall, a right wall, and a lower wall. These side walls effectively block X-rays from leaking out of the X-ray irradiation space when the X-ray shielding door is closed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-183201 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional X-ray inspection device described above, although the lower wall portion is configured to be inclined downward when the device is closed, as long as there is a lower wall portion that can support water or dirt from below, water or dirt may remain attached thereto.

[0006] Therefore, an object of the present invention is to provide an X-ray inspection apparatus that can effectively prevent X-rays from leaking through an X-ray shielding door without providing a protrusion at the bottom end of the X-ray shielding door. [Means for solving the problem]

[0007] The X-ray inspection device of the present invention comprises an X-ray irradiation unit that irradiates an object with X-rays, a conveying unit that conveys an object in one direction so that the object passes through an irradiation space of X-rays irradiated from the X-ray irradiation unit, an X-ray detection unit that detects X-rays that have passed through the object, and an X-ray shielding door that is arranged on one side of the conveying unit in a width direction that is perpendicular to both the conveying direction and the vertical direction of the object, and that opens the irradiation space to the outside in an open state and prevents X-rays from leaking from the irradiation space in a closed state, and at least a part of the inner surface of the X-ray shielding door is formed with an inclined portion that slopes downward from one side to the other in the width direction when viewed from the conveying direction in a closed state, and in the closed state, the vertical lower end of the inclined portion is located on the other side in the width direction of the end position on one side of the conveying unit in the width direction.

[0008] In an X-ray inspection device with this configuration, a flat inclined portion is formed on at least a portion of the inner surface of the X-ray shielding door. In the closed state, the lower end of the inclined portion is located on the other widthwise side of the end position on one side of the widthwise side of the transport unit, so the inclined portion is located on a path along which X-rays linearly leak from between the transport unit and the inclined portion. This makes it possible to effectively prevent X-rays from leaking through the X-ray shielding door without providing a protrusion at the lower end of the X-ray shielding door.

[0009] In the X-ray inspection device according to the present invention, the upper end of the inclined portion may be located above the conveying surface of the conveying portion. In this configuration, most of the inner surface of the X-ray shielding door is formed flat, so that water can be effectively guided from above to below.

[0010] In the X-ray inspection apparatus according to the present invention, the inclined portion may extend linearly from the upper end to the lower end of the inclined portion. With this configuration, water can be effectively guided from above to below on the inner surface of the X-ray shielding door.

[0011] In the X-ray inspection device according to the present invention, the X-ray shielding door may have a protruding portion formed on a portion of the circumferential edge of the inner surface of the X-ray shielding door, protruding from the circumferential edge toward the other side in the width direction, with the circumferential edge as a base end. A portion of the lower end of the inner surface of the X-ray shielding door, which is included in the portion of the circumferential edge, may have a sloped lower end that coincides with the lower end of the sloped portion. The lower end of the inner surface of the X-ray shielding door, excluding the sloped lower end, may have a protruding portion that slopes along the conveyance direction. With this configuration, the provision of the protruding portion can more reliably prevent X-rays from leaking from the irradiation space. Furthermore, even if a protruding portion is provided on the lower end of the inner surface of the X-ray shielding door, the sloped protruding portion can prevent water or dirt from remaining attached thereto. As a result, it is possible to pinpoint areas where X-ray leakage must be reliably prevented, while preventing water or dirt from remaining attached to a portion of the X-ray shielding door.

[0012] In the X-ray inspection device according to the present invention, the protruding portions may be provided so as to sandwich the inclined lower end portion in the conveying direction, and the protruding portions may be inclined downward toward the inclined lower end portion in the conveying direction. With this configuration, it is possible to pinpoint the location where it is desired to reliably prevent X-ray leakage, while preventing water or dirt from remaining on part of the X-ray shielding door.

[0013] The X-ray inspection device according to the present invention may further include a support unit that supports the X-ray detection unit, and the protrusion may be provided so that a portion of the protrusion is located vertically below the support unit when viewed in the width direction. In this configuration, the protrusion is not provided in the region where the support unit that blocks X-rays is located in the transport direction, thereby maximizing the function of allowing water to flow downward, and the X-ray blocking function is achieved in the region where the support unit is not located. This makes it possible to prevent water or dirt from adhering while also preventing X-rays from leaking through the X-ray shielding door. [Effects of the Invention]

[0014] According to the present invention, it is possible to effectively prevent X-rays from leaking through the X-ray shielding door without providing a protrusion at the lower end of the X-ray shielding door. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a configuration diagram of an X-ray inspection apparatus according to an embodiment. [Figure 2] FIG. 2 is a perspective view of an X-ray inspection apparatus according to one embodiment. [Figure 3] FIG. 3 is a perspective view of the X-ray shielding door in an open state. [Figure 4] 4 is a cross-sectional view taken along the line IV-IV in FIG. 1 when the X-ray shielding door is in a closed state. [Figure 5] 5 is a perspective view of the X-ray shielding door of the X-ray inspection apparatus of FIG. [Figure 6] FIG. 6 is a perspective view of the X-ray shielding door of FIG. 5 with the hinge portion removed. DETAILED DESCRIPTION OF THE INVENTION

[0016] An X-ray inspection apparatus 1 according to a preferred embodiment of the present invention will be described below with reference to the drawings. In the description of the drawings, the same elements are given the same reference numerals, and duplicated description will be omitted. For ease of explanation, an X-axis direction, a Y-axis direction, and a Z-axis direction that are orthogonal to each other are set in FIGS. 1 to 6. The X-axis direction is a direction parallel to the conveying direction X of the article A by the conveying unit 5, the Y-axis direction is a width direction Y that is orthogonal to the conveying direction X on the conveying surface of the article A, and the Z-axis direction is a vertical direction Z that is orthogonal to both the conveying direction X and the width direction Y.

[0017] 1 and 2, the X-ray inspection device 1 includes an apparatus main body 2, support legs 3, a shielding box 4, a transport unit 5, an X-ray irradiation unit 6, an X-ray detection unit 7, a display operation unit 8, and a control unit 10. The X-ray inspection device 1 acquires an X-ray transmission image of the item A while transporting the item A, and performs an inspection of the item A (for example, a storage quantity inspection, a foreign matter contamination inspection, a missing item inspection, or a crack / chip inspection, etc.) based on the X-ray transmission image.

[0018] Note that item A before inspection is carried into the X-ray inspection device 1 by an input conveyor 91, and item A after inspection is carried out from the X-ray inspection device 1 by an output conveyor 92. Item A determined to be a defective item by the X-ray inspection device 1 is sorted out of the production line by a sorting device (not shown) arranged downstream of the output conveyor 92, and item A determined to be a non-defective item by the X-ray inspection device 1 passes through the sorting device as is.

[0019] The apparatus main body 2 houses the control unit 10 and other components. The support legs 3 support the apparatus main body 2. The shielding box 4 is provided on the apparatus main body 2 and prevents X-rays from leaking from the irradiation space R of X-rays irradiated from the X-ray irradiation unit 6. The shielding box 4 has an inlet 4a and an outlet 4b. The shielding box 4 is also provided with an X-ray shielding door 20 on one side (the front side where an operator operates the X-ray inspection apparatus 1) in a width direction Y that is perpendicular to both the conveyance direction X of the article A and the vertical direction Z. The X-ray shielding door 20 opens the irradiation space R to the outside when in an open state and prevents X-rays from leaking from the irradiation space R when in a closed state. The X-ray shielding door 20 will be described in detail later.

[0020] Before inspection, an item A is carried into the shielding box 4 from the carry-in conveyor 91 via the carry-in entrance 4a, and after inspection, the item A is carried out from the shielding box 4 via the carry-out exit 4b onto the carry-out conveyor 92. Each of the carry-in entrance 4a and the carry-out exit 4b is provided with an X-ray shielding curtain 11 to prevent leakage of X-rays.

[0021] The transport unit 5 is disposed within the shielding box 4 and transports the article A from the inlet 4a to the outlet 4b so that the article A passes through the X-ray irradiation space R. The transport unit 5 has a transport conveyor 5A and a conveyor support unit 5B. The transport conveyor 5A transports the article A placed on the belt B, which is stretched between the inlet 4a and the outlet 4b, by rotating the belt B in the transport direction, for example. The conveyor support unit 5B is a member that supports the transport conveyor 5A and the X-ray detection unit 7, which will be described in detail later, and is cantilevered by the device main body 2.

[0022] The X-ray irradiator 6 is disposed in the shield box 4 and irradiates X-rays onto the object A being transported by the transport conveyor 5A. The X-ray irradiator 6 includes, for example, an X-ray tube that emits X-rays, and a collimator that spreads the X-rays emitted from the X-ray tube in a fan shape in a plane perpendicular to the transport direction X.

[0023] The X-ray detection unit 7 is disposed within the shielding box 4 and detects X-rays transmitted through the article A and the belt B. The X-ray detection unit 7 is configured as, for example, a line sensor. Specifically, the X-ray detection unit 7 has a plurality of photodiodes arranged one-dimensionally along a horizontal direction perpendicular to the conveyance direction X, and a scintillator arranged on the X-ray incident side of each photodiode. In this case, in the X-ray detection unit 7, X-rays incident on the scintillator are converted into light, and the light incident on each photodiode is converted into an electrical signal. The X-ray detection unit 7 is supported by the conveyor support part 5B.

[0024] The display operation unit 8 is provided in the device main body 2 and displays various information and accepts input of various conditions. The display operation unit 8 is, for example, a liquid crystal display, and displays an operation screen as a touch panel. In this case, the operator can input various conditions via the display operation unit 8.

[0025] The control unit 10 is disposed within the device main body 2 and controls the operation of each part of the X-ray inspection device 1. The control unit 10 is composed of a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), etc. The control unit 10 receives an A / D converted signal output from the X-ray detection unit 7. The control unit 10 generates an X-ray transmission image of the item A based on the signal and functions as an inspection unit that inspects the item A based on the X-ray transmission image.

[0026] The X-ray shielding door 20 will be described in detail below. As shown in FIGS. 2 and 3, the X-ray shielding door 20 is disposed on one side of the transport conveyor 5A in the width direction Y. In an open state (see FIG. 3), the X-ray shielding door 20 opens the irradiation space R to the outside, and in a closed state (see FIG. 2), the X-ray shielding door 20 prevents X-rays from leaking from the irradiation space R. The X-ray shielding door 20 is fixed to the support leg 3 via a hinge portion 27. As shown in FIG. 5, the hinge portion 27 has a first frame portion 27a, a rotation shaft 27b, and a second frame portion 27c. The first frame portion 27a is fixed to the support leg 3. The second frame portion 27c is provided rotatable about the rotation shaft 27b extending in the X-axis direction relative to the first frame portion 27a. The second frame portion 27c is fixed to the X-ray shielding door 20. The X-ray shielding door 20 can be switched between an open state and a closed state by rotating around a hinge portion 27. The X-ray shielding door 20 is provided with a handle 29 that is operated by an operator.

[0027] As shown in FIGS. 4 to 6, the X-ray shielding door 20 has an inner surface 21 and an outer surface 22. The X-ray shielding door 20 also has a front surface 30, a left front surface 40, and a right front surface 50. The front surface 30 has an inner surface 31 and an outer surface 32. As shown in FIG. 4, the inner surface 31 has a flat inclined portion 60 (hatched portion in FIGS. 3, 5, and 6) that slopes linearly downward from one side (the left side of the paper in FIG. 4) to the other side (the right side of the paper in FIG. 4) in the width direction Y when viewed from the transport direction X in the closed state. The inclined portion 60 is formed in a flat shape when viewed from the width direction Y.

[0028] The inclined lower end 62, which is the lower end of the inclined portion 60, is located a distance G1 (e.g., 0 mm to 10 mm) in length from the position of the end 5E of the conveying unit 5 on one side in the width direction Y (the left side in FIG. 4 ) and on the other side in the width direction Y (the right side in FIG. 4 ). In other words, in a plan view seen from the vertical direction Z, the inclined lower end 62 is located below the position of the end 5E of the conveying unit 5 and extends below the conveying unit 5 by a distance G1 (e.g., 0 mm to 10 mm). Note that a distance G1 of 0 mm means that the inclined lower end 62 is directly below the end 5E. The inclined lower end 62 extends in an inclined downward direction toward the center of the front portion 30 along the X-axis direction, but is located on the other side in the width direction Y (the right side in FIG. 4 ) of the position of the end 5E of the conveying unit 5 throughout its extension direction. The X-ray shielding door 20 is provided so that the distance G2 between the inclined portion 60 and the conveyor support portion 5B in the width direction Y is minimized. The inclined upper end portion 63, which is the upper end of the inclined portion 60, is located above the conveying surface TF of the conveying portion 5 (i.e., the belt B on which the article A is placed).

[0029] The left front surface portion 40 has an inner surface 41 and an outer surface 42, and the right front surface portion 50 has an inner surface 51 and an outer surface 52. The left front surface portion 40 and the right front surface portion 50 are arranged to sandwich the front surface portion 30 in the transport direction X. A protrusion 70 is provided on part of the peripheral edge 21a of the inner surface 21 of the X-ray shielding door 20 (the combined area of ​​the inner surface 31 of the front surface portion 30, the inner surface 41 of the left front surface portion 40, and the inner surface 51 of the right front surface portion 50). The protrusion 70 protrudes from the peripheral edge 21a to the other side in the width direction Y.

[0030] The protruding portion 70 has a first protruding portion 71 protruding from the lower end 41 a of the inner surface 41 of the left front portion 40, a second protruding portion 72 protruding from the lower end 51 a of the inner surface 51 of the right front portion 50, a third protruding portion 73 protruding from the side end 41 b of the inner surface 41 of the left front portion 40, a fourth protruding portion 74 protruding from the side end 51 b of the inner surface 51 of the right front portion 50, and a fifth protruding portion 75 protruding from the upper end 31 c of the inner surface 31 of the front portion 30, the upper end 41 c of the inner surface 41 of the left front portion 40, and the upper end 51 c of the inner surface 51 of the right front portion 50. The protruding portions 70 of this embodiment may be formed by bending the peripheral edges of the front portion 30, the left front portion 40, and the right front portion 50 by, for example, press working or the like, or may be connected to separate members by welding or the like.

[0031] 6, the first protrusion 71 is inclined downward toward the front surface portion 30 in the transport direction X. In the closed state, the tip of the first protrusion 71 is located below the transport unit 5. The second protrusion 72 is inclined downward toward the front surface portion 30 in the transport direction X. In the closed state, the tip of the second protrusion 72 is located below the transport unit 5. In the transport direction X, there is no protrusion 70 between the first protrusion 71 and the second protrusion 72. In this embodiment, the lower end 21b included in part of the peripheral edge 21a of the X-ray shielding door 20 is formed by the lower end 31a on the inner surface 31 of the front surface portion 30, the lower end 41a on the inner surface 41 of the left front surface portion 40, and the lower end 51a on the inner surface 51 of the right front surface portion 50, but no protrusion 70 is formed on the inclined lower end 62, which is the vertical lower end 31a on the inner surface 31 of the front surface portion 30. When viewed from the width direction Y, the first protruding portion 71 and the second protruding portion 72 are provided so that a portion thereof is located below the conveyor support portion 5B in the vertical direction Z.

[0032] Next, the effects of the X-ray inspection apparatus 1 of this embodiment will be described. In the X-ray inspection apparatus 1 of the above embodiment, a flat inclined portion 60 is formed on at least a part of the inner surface 21 of the X-ray shielding door 20. In the closed state, the inclined lower end 62 of the inclined portion 60 is located on the other side in the width direction Y of the transport unit 5 relative to the position of the end 5E on one side in the width direction Y. Therefore, the inclined portion 60 is located on a path along which X-rays linearly leak from between the transport unit 5 and the inclined portion 60. This makes it possible to effectively prevent X-rays from leaking through the X-ray shielding door 20 without providing a protrusion on the lower end 21b of the X-ray shielding door 20.

[0033] Furthermore, since the inclined portion 60 is formed flat from the inclined upper end 63 to the inclined lower end 62, even when water is used for cleaning, the water is smoothly guided from above to below as shown by the arrow W1 in Figures 5 and 6. This makes it possible to prevent water or dirt from remaining on the X-ray shielding door 20. Note that in Figure 5, the hinge portion 27 is arranged, but a gap sufficient for water to flow is formed between the inner surface 31 of the front portion 30 to which the hinge portion 27 is attached and the rotation shaft 27b of the hinge portion 27.

[0034] In the X-ray inspection apparatus according to the present invention, the upper end of the inclined portion 60 may be located above the conveying surface of the conveying portion. In this configuration, most of the inner surface of the X-ray shielding door is formed flat, so that water can be effectively guided from above to below.

[0035] The inclined portion 60 in the X-ray inspection device 1 of this embodiment extends linearly from the upper inclined end 63 to the lower inclined end 62, so that water can be effectively guided from above to below on the inner surface 21 of the X-ray shielding door 20.

[0036] The X-ray shielding door 20 of the X-ray inspection apparatus 1 of the above embodiment is provided with the first protrusion 71, the second protrusion 72, the third protrusion 73, the fourth protrusion 74, and the fifth protrusion 75, which more reliably prevents X-rays from leaking from the irradiation space R. Furthermore, even when the first protrusion 71 and the second protrusion 72 are provided at the lower end 21b of the inner surface 21 of the X-ray shielding door 20, the first protrusion 71 and the second protrusion 72 are inclined. Therefore, even when water is used for cleaning, the water is smoothly guided from above to below, as shown by arrows W2 and W3 in FIGS. 5 and 6 . This prevents water or dirt from remaining attached to the X-ray shielding door 20. As a result, it is possible to reliably prevent X-ray leakage while preventing water or dirt from remaining attached to a part of the X-ray shielding door 20.

[0037] In the X-ray inspection device 1 of the above embodiment, the first protrusion 71 and the second protrusion 72 are provided to sandwich the inclined lower end portion 62 in the conveying direction X, and the first protrusion 71 and the second protrusion 72 are inclined downward toward the inclined lower end portion 62 in the conveying direction X. This can reliably prevent X-ray leakage while suppressing water or dirt from remaining attached to a part of the X-ray shielding door 20.

[0038] In the X-ray inspection device 1 of the above embodiment, when viewed from the width direction Y, the first protrusion 71 and the second protrusion 72 are provided so that a portion thereof is located vertically below the conveyor support portion 5B. In this configuration, the conveyor support portion 5B that shields X-rays in the conveyance direction X is arranged, and in areas where X-rays are unlikely to leak downward, the protrusion 70 that protrudes in the width direction is not arranged, thereby maximizing the function of allowing water to flow downward, and the function of shielding X-rays can be achieved in areas where the conveyor support portion 5B is not arranged. This makes it possible to prevent water or dirt from adhering and to prevent X-rays from leaking through the X-ray shielding door 20.

[0039] Although one embodiment has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the invention.

[0040] In the X-ray inspection apparatus 1 of the above embodiment, the X-ray shielding door 20 including the left front portion 40 and the right front portion 50 and the inner surfaces of the left front portion 40 and the right front portion 50 has been described as an example, but is not limited to this. For example, the X-ray inspection apparatus 1 may include only the front portion 30 and its inner surface 31, and the entire inner surface 31 may be formed by the inclined portion 60.

[0041] In the X-ray inspection apparatus 1 of the above embodiment, an example has been described in which the first protrusion 71, the second protrusion 72, the third protrusion 73, the fourth protrusion 74, and the fifth protrusion 75 are provided, but these may not be provided or may be provided selectively. Furthermore, the protrusion 70 may be provided on a part of the peripheral edge 21a of the X-ray shielding door 20 different from the above embodiment and modified example, but even in this case, the protrusion 70 is provided at a portion other than the inclined lower end portion 62.

[0042] In the X-ray inspection apparatus 1 according to the above embodiment and modified example, an example has been described in which the inclined lower end portion 62 coincides with the lower end 21b of the inner surface 21 of the X-ray shielding door 20, i.e., an example in which no member is disposed extending downward from the inclined lower end portion 62, but the present invention is not limited to this. For example, there may be a portion extending downward in the vertical direction from the inclined lower end portion 62, or there may be a portion bent at an obtuse angle from the inclined lower end portion 62 to one side (front side) in the width direction Y. [Explanation of symbols]

[0043] 1...X-ray inspection device, 4...shielding box, 5...transport section, 5A...transport conveyor, 5B...conveyor support section (support section), 5E...end section, 6...X-ray irradiation section, 7...X-ray detection section, 20...X-ray shielding door, 21...inner surface, 21a...peripheral edge, 21b...lower edge, 30...front section, 31...inner surface, 31a...lower edge, 40...left front section, 41...inner surface, 41a...lower edge, 50...right front section, 51...inner surface, 51a...lower edge, 60...inclined section, 62...lower inclined end section, 63...upper inclined end section, 70...protruding section, 71...first protruding section, 72...second protruding section, 73...third protruding section, 74...fourth protruding section, 75...fifth protruding section, A...article, R...irradiation space, TF...transport surface, X...transport direction, Y...width direction, Z...vertical direction.

Claims

1. an X-ray irradiation unit that irradiates an object with X-rays; a conveying unit that conveys the object in one direction so that the object passes through an irradiation space of X-rays irradiated from the X-ray irradiating unit; an X-ray detection unit that detects X-rays that have passed through the article; an X-ray shielding door that is disposed on one side of the conveying section in a width direction perpendicular to both the conveying direction and the vertical direction of the article, and that opens the irradiation space to the outside in an open state and prevents X-rays from leaking from the irradiation space in a closed state; a lower end of the X-ray shielding door is located below a conveyance surface of the conveyance unit; an inclined portion inclined downward from one side to the other side in the width direction is formed on the inner surface of the X-ray shielding door; a lower end of the inclined portion at a lower end of the X-ray shielding door is located on the other side in the width direction relative to an end position on one side of the width direction of the transport unit, a pair of protrusions are formed on both ends of the lower end of the inclined portion excluding the lower end of the inclined portion at the lower end of the X-ray shielding door so as to sandwich the lower end of the inclined portion; the pair of protrusions protrude to the other side in the width direction from the lower end of the X-ray shielding door as a base end, and are inclined downward toward the lower end of the inclined portion in the conveying direction.

2. an X-ray irradiation unit that irradiates an object with X-rays; a conveying unit that conveys the object in one direction so that the object passes through an irradiation space of X-rays irradiated from the X-ray irradiating unit; an X-ray detection unit that detects X-rays that have passed through the article; an X-ray shielding door that is disposed on one side of the conveying section in a width direction perpendicular to both the conveying direction and the vertical direction of the article, and that opens the irradiation space to the outside in an open state and prevents X-rays from leaking from the irradiation space in a closed state; a lower end of the X-ray shielding door is located below a conveyance surface of the conveyance unit; an inclined portion that inclines downward from one side to the other side in the width direction when viewed from the transport direction in the closed state is formed on at least a part of the inner surface of the X-ray shielding door; In the closed state, a vertical lower end of the inclined portion is located on the other side in the width direction of the conveying portion relative to an end position on one side in the width direction of the conveying portion, a protrusion is formed on the X-ray shielding door, the protrusion protruding from a part of a peripheral edge of an inner surface of the X-ray shielding door toward the other side in the width direction with the peripheral edge as a base end; a part of a lower end of an inner surface of the X-ray shielding door, which is included in the part of the peripheral edge, has a sloped lower end that coincides with a lower end of the sloped portion; an X-ray inspection apparatus, wherein the protrusion is provided at a lower end of the inner surface of the X-ray shielding door, the protrusion being inclined along the conveyance direction, except for the inclined lower end portion.

3. 3. The X-ray inspection apparatus according to claim 1, wherein an upper end of the inclined portion is located above a conveying surface of the conveying portion.

4. 4. The X-ray inspection apparatus according to claim 1, wherein the inclined portion extends linearly from an upper end to a lower end.

5. a support portion that supports the X-ray detection portion, 5. The X-ray inspection apparatus according to claim 1, wherein the protruding portion is provided so that a part of the protruding portion is positioned vertically below the supporting portion when viewed from the width direction.

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