JP2012058082A - X-ray inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray inspection device capable of changing force to be required when an inspection object passes through an opening of an inspection chamber according to the height of the inspection object to make it easy for the inspection object to pass through the opening of the inspection chamber by simple structure.SOLUTION: The X-ray inspection device performs an inspection by irradiating an article 900 with X-rays in the inspection chamber, and includes an X-ray leakage prevention curtain 500 for preventing leakage of X-rays at the opening of the inspection chamber. In the X-ray inspection device, the X-ray leakage prevention curtain 500 blocks the opening at a closed state, and the article 900 passes through the opening at an open state. The X-ray leakage prevention curtain 500 includes: a first rotation plate 510 which rotates centering around a first rotational axis 530 provided in the vertical direction to the conveyance surface 810 of a belt conveyor which horizontally conveys the article 900; and a second rotation plate 520 which rotates centering around a second rotational axis 540 provided above the first rotational axis 530.

Description

  The present invention relates to an X-ray inspection apparatus that irradiates an inspection object with X-rays and detects foreign matter in the inspection object.

  Conventionally, an X-ray inspection apparatus has been used to detect foreign matter in an inspection object. Research and development is being conducted on this X-ray inspection apparatus every day.

  Patent Document 1 discloses an X-ray foreign substance inspection apparatus that detects a foreign substance contained in an object to be inspected by detecting transmitted X-rays, and prevents X-ray leakage and makes an operator safe. A foreign matter inspection apparatus is disclosed.

  In the X-ray foreign substance inspection apparatus described in Patent Document 1, in the X-ray foreign substance inspection apparatus that detects the foreign substance contained in the inspection object using transmitted X-rays, a horizontal conveyor that conveys the inspection object, An X-ray leakage protection good which is disposed in the vicinity of the start end portion and the end portion and is pushed up by transport of the inspection object to form a passage space for the inspection object according to the size of the inspection object. The line leakage protection goodwill is divided in the vertical direction so that the passage space can be easily formed, and further includes an X-ray leakage protection goodwill having a structure that can be refracted in multiple stages in the horizontal direction.

JP 2003-270174 A

  The X-ray foreign substance inspection apparatus described in Patent Document 1 has an X-ray leakage protection goodwill (hereinafter referred to as “X-ray leakage prevention curtain”) having a structure that can be refracted in multiple stages in the horizontal direction. Since this X-ray leakage prevention curtain is refracted in multiple stages, a large number of rotating shafts are required. Therefore, since the X-ray leakage prevention curtain has a complicated structure, the manufacturing cost of the X-ray foreign matter inspection apparatus is increased.

  The object of the present invention is to have a simple structure and change the force required when the inspection object passes through the opening of the inspection room according to the height of the inspection object. An X-ray inspection apparatus that can easily pass through an opening of a chamber.

(1)
An X-ray inspection apparatus according to one aspect performs an inspection by irradiating an inspection object transported by a transport unit with X-rays in an inspection room, and opens an X used to carry in or out the inspection object in the inspection room. An X-ray inspection apparatus that includes an X-ray leakage prevention member that prevents leakage of the wire, and that the X-ray leakage prevention member closes the opening in the closed state, and the object to be inspected passes through the opening in the open state. The X-ray leakage preventing member opens and closes by rotating around a first rotation shaft provided in a direction perpendicular to the transport surface of the transport unit that transports the object to be inspected horizontally. And a second rotating plate that opens and closes by rotating around a second rotating shaft provided above the first rotating shaft.

  In this case, the object to be inspected having a height that is pressed against the second rotating plate passes through the opening of the inspection chamber with the first rotating plate and the second rotating plate opened. In addition, for an object to be inspected that does not press against the second rotating plate, the first rotating plate is opened while the second rotating plate is closed, and the opening of the inspection chamber is opened. pass. Thereby, with a simple structure, the force required when the inspection object passes through the opening of the inspection room can be changed according to the height of the inspection object. As a result, the inspection object can easily pass through the opening of the inspection room. Moreover, since the X-ray leakage prevention member has a simple structure, the manufacturing cost of the X-ray inspection apparatus can be reduced.

(2)
In the X-ray inspection apparatus, it is preferable that a pair of the first rotation shaft and the first rotation plate are provided, and the pair of first rotation plates have a double door structure.

  In this case, since the pair of first rotating plates are double-spread, the object to be inspected is easily guided to the center side of the transport unit. Thereby, a to-be-inspected object can be conveyed stably.

(3)
In the X-ray inspection apparatus, it is preferable that the pair of first rotating plates are formed so as to partially overlap each other in the closed state.

  In this case, the pair of first rotating plates partially overlap each other when the pair of first rotating plates are in the closed state, so that a gap is hardly generated between the first rotating plates. Thereby, it can prevent more reliably that an X-ray leaks outside the examination room.

(4)
In the X-ray inspection apparatus, the second rotation shaft is provided in a direction parallel to the transfer surface of the transfer unit, and the second rotation plate is suspended from the second rotation shaft. preferable.

  In this case, since the second rotating plate is suspended from the second rotating shaft, it can be closed by its own weight. Thereby, since it is not necessary to use the elastic body for closing the 2nd rotation board of an open state, the manufacturing cost of a X-ray inspection apparatus can be reduced.

(5)
In the X-ray inspection apparatus, the second rotating plate is formed so as to partially overlap the first rotating plate when in the closed state, and conveys the inspection object more than the first rotating plate. It is preferable that it is arranged upstream in the direction.

  In this case, since the first rotating plate and the second rotating plate partially overlap each other in the closed state, a gap is less likely to be generated between the first rotating plate and the second rotating plate. Thereby, it can prevent more reliably that an X-ray leaks outside the examination room.

  Further, the second rotating plate is disposed upstream of the first rotating plate in the conveyance direction of the inspection object. An object to be inspected that does not press against the second rotating plate passes through the opening of the examination room with the first rotating plate open while the second rotating plate is closed. . As a result, the force required when the inspection object passes through the opening of the inspection room can be changed according to the height of the inspection object with a simple structure. It can be easy to pass through the part.

(6)
In the X-ray inspection apparatus, it is preferable that the first rotation shaft has an elastic body for closing the first rotation plate in the open state and a cover that covers the elastic body.

  In this case, since the elastic body is covered with the cover, it is possible to prevent the object to be inspected from coming into direct contact with the elastic body. Thereby, the elastic force of an elastic body can be maintained. Further, even if the elastic body is damaged due to long-term use, it is possible to prevent the damaged elastic body from coming out of the cover. As a result, it is possible to prevent the damaged elastic body from being mixed as a foreign substance in the object to be inspected.

(7)
In the X-ray inspection apparatus, at least one of the first rotating plate and the second rotating plate is opened and closed by rotating about the first rotating shaft or the second rotating shaft. It preferably consists of a moving piece.

  In this case, the object to be inspected passes through the opening of the examination room with the rotating piece that is pressed open while the rotating piece that does not press is closed. Thereby, with a simple structure, the force required when the inspection object passes through the opening of the inspection room can be changed according to the height and width of the inspection object. As a result, the inspection object can easily pass through the opening of the inspection room.

(8)
In the X-ray inspection apparatus, the rotating piece of the first rotating plate partially overlaps with the adjacent rotating piece on the lower side of the rotating piece when in the closed state, and the lower rotating piece It is preferable that it is arranged on the upstream side in the transport direction of the inspection object than the piece.

  In this case, since the rotating pieces of the first rotating plate partially overlap each other when they are in the closed state, a gap is hardly generated between the rotating pieces of the first rotating plate. Thereby, it can prevent more reliably that an X-ray leaks outside the examination room.

  Further, the rotating piece is arranged on the upstream side in the conveyance direction of the inspection object with respect to the rotating piece on the lower side. Accordingly, the inspection object passes through the opening portion with the rotating piece that is pressed open while the rotating piece that is not pressed is closed. As a result, the force required when the inspection object passes through the opening of the inspection room can be changed according to the height of the inspection object with a simple structure. It can be easy to pass through the part.

(9)
In the X-ray inspection apparatus, it is preferable that at least one of the first rotating plate and the second rotating plate is made of a metal plate.

  In this case, since the rotating plate is made of a metal plate, it has excellent durability and is not easily twisted. Thereby, it becomes difficult to produce a clearance gap between rotation plates. As a result, X-rays can be more reliably prevented from leaking outside the examination room.

  According to the X-ray inspection apparatus of the present invention, the force required when the inspection object passes through the opening of the inspection room can be changed according to the height of the inspection object with a simple structure. The inspection object can easily pass through the opening of the inspection room.

1 is a schematic external view of an X-ray inspection apparatus according to a first embodiment of the present invention. It is a typical perspective view which shows the internal structure of the X-ray inspection apparatus shown in FIG. It is a typical perspective view of the X-ray leakage prevention curtain of the X-ray inspection apparatus shown in FIG. It is a typical side view of the X-ray leakage prevention curtain of the X-ray inspection apparatus shown in FIG. FIG. 5 is a schematic perspective view of a torsion spring and a cover of the X-ray leakage prevention curtain shown in FIGS. 3 and 4. It is a typical side view for demonstrating the state which goods pass through the X-ray leakage prevention curtain of the X-ray inspection apparatus shown in FIG. It is a typical side view for demonstrating the state which goods pass through the X-ray leakage prevention curtain of the X-ray inspection apparatus shown in FIG. It is a typical perspective view of the X-ray leakage prevention curtain of the X-ray inspection apparatus which concerns on 2nd Embodiment of this invention. It is a typical side view for demonstrating the state which goods pass through the X-ray leakage prevention curtain of the X-ray inspection apparatus shown in FIG. It is a typical side view for demonstrating the state which goods pass through the X-ray leakage prevention curtain of the X-ray inspection apparatus shown in FIG. It is a typical perspective view of the X-ray leakage prevention curtain of the X-ray inspection apparatus which concerns on 3rd Embodiment of this invention. It is a typical side view for demonstrating the state which goods pass through the X-ray leakage prevention curtain of the X-ray inspection apparatus shown in FIG. A state where the product passes through the X-ray leakage prevention curtain of the X-ray inspection apparatus shown in FIG. 11 will be described. It is a typical perspective view of the X-ray leakage prevention curtain of the X-ray inspection apparatus which concerns on the modification of this invention.

(First embodiment)
As shown in FIG. 1, the X-ray inspection apparatus 100 according to the first embodiment has an inspection chamber 300 formed inside the apparatus. In the inspection room 300, an opening 310 for carrying in an article 900 (see FIG. 2), which is an object to be inspected, and an opening 310 for carrying out are formed, respectively, and the X-ray irradiation apparatus 200 is built therein. In addition, the X-ray inspection apparatus 100 includes a belt conveyor 800 that is a transport unit provided so as to penetrate each opening 310 of the inspection room 300.

  In addition, the X-ray inspection apparatus 100 includes an X-ray leakage prevention curtain 500 that is an X-ray leakage prevention member in order to prevent X-rays from leaking from the opening 310 of the examination room 300. The detailed structure of the X-ray leakage prevention curtain 500 will be described later.

  As shown in FIG. 2, the examination room 300 includes an X-ray irradiation apparatus 200, a line sensor 220, an X-ray leakage prevention curtain 500, a guide guide 700, and a belt conveyor 800. One X-ray leakage prevention curtain 500 is provided in each of the loading opening 310 and the unloading opening 310 of the examination room 300 (see FIG. 1). The X-ray leakage prevention curtain 500 holds a combination of the first rotation plate 510 and the second rotation plate 520 one by one with a pedestal 570.

  The belt conveyor 800 is provided by winding an endless belt around a pair of rollers, and horizontally conveys the product 900 placed on the conveyance surface 810. Inside the belt conveyor 800, a line sensor 220 including a scintillator and a photodiode element is provided. A pair of guide guides 700 are provided on the conveyance surface 810 of the belt conveyor 800. This guide guide 700 is made of a plate material extending in the conveyance direction of the product 900 (in the direction of the arrow X), and is for preventing the product 900 being conveyed from spilling off from the belt conveyor 800.

  In addition, the belt conveyor 800 is provided with a distance of at least 500 mm from a position where the conveyance of the product 900 is started to a position where the product 900 contacts the X-ray leakage prevention curtain 500 provided in the opening 310 for carrying in. It is preferable. Thereby, since the attitude | position of the goods 900 conveyed is stabilized, the test | inspection efficiency in the test | inspection room 300 can be improved.

  The product 900 to be transported moves in the transport direction (the direction of the arrow X) without dropping from the belt conveyor 800 by the guide guide 700. Then, the product 900 passes through the X-ray leakage prevention curtain 500 provided in the opening 310 on the carry-in side and moves to the inside of the examination room 300. Next, the product 900 is irradiated with X-rays 210 from the X-ray irradiation apparatus 200. The X-ray 210 transmitted through the product 900 enters the line sensor 220. The product 900 irradiated with the X-ray 210 passes through the X-ray leakage prevention curtain 500 provided in the opening 310 on the carry-out side, moves to the outside of the inspection room 300, and is then conveyed to the belt conveyor in the next process. Is done.

<X-ray leakage prevention curtain>
As shown in FIGS. 3 and 4, the X-ray leakage prevention curtain 500 includes a first rotating plate 510, a second rotating plate 520, a first rotating shaft 530, a second rotating shaft 540, It consists of a first shaft support portion 550, a second shaft support portion 560 and a pedestal 570. The first rotation shaft 530 has a rotation plate return portion 580 for closing the first rotation plate 510 in the open state.

  The pedestal 570 rotatably holds the first rotation plate 510 and the second rotation plate 520 one by one on the upstream side and the downstream side in the transport direction (the direction of the arrow X). The interval between the combination of the first rotation plate 510 and the second rotation plate 520 is configured to be longer than the length of the product 900.

  The 1st rotation board 510 is provided in the conveyance surface 810 vicinity of the belt conveyor 800 (refer FIG. 4). The second rotation plate 520 is provided on the first rotation plate 510 so as to be flush with the first rotation plate 510.

  The first rotation shaft 530 passes through the hole of the first shaft support portion 550 and is provided in a direction perpendicular to the conveyance surface 810 of the belt conveyor 800. The first rotating plate 510 is made of a metal plate and rotates around the first rotating shaft 530 toward the downstream side in the transport direction when the closed state is opened.

  The second rotation shaft 540 passes through the hole of the second shaft support portion 560, is provided above the first rotation shaft 530 and in a direction parallel to the conveyance surface 810 of the belt conveyor 800. Yes. The second rotating plate 520 is made of a metal plate and is suspended from the second rotating shaft 540. When the second rotating plate 520 changes from the closed state to the open state, the second rotating plate 520 rotates upward about the second rotating shaft 540. Move.

  The X-ray leakage prevention curtain 500 closes the loading-side opening 310 or the unloading-side opening 310 when both the first rotation plate 510 and the second rotation plate 520 are in the closed state. The 210 is prevented from leaking outside the examination room 300. Further, in the X-ray leakage prevention curtain 500, when at least one of the first rotation plate 510 and the second rotation plate 520 is in an open state, the product 900 is carried into or out of the inspection room 300.

<Rotating plate return part>
As shown in FIG. 5, the rotating plate return portion 580 provided on the first rotating shaft 530 includes a torsion spring 581 that is an elastic body and a cover 582 that covers the torsion spring 581. The torsion spring 581 rotates the first rotation shaft 530 so that the open first rotation plate 510 is closed by its elastic force.

<Operation of X-ray leakage prevention curtain>
As shown in FIG. 6, when the height of the product 900 is such that the product 900 is pressed against the second rotation plate 520, the product 900 has the first rotation plate 510 and the second rotation on the upstream side in the transport direction. Both plates 520 are rotated to open. After the product 900 passes, the first rotation plate 510 and the second rotation plate 520 on the upstream side in the conveyance direction are changed from the open state to the closed state. After the first rotation plate 510 and the second rotation plate 520 on the upstream side in the conveyance direction are in the closed state, the product 900 is supplied with the first rotation plate 510 and the second rotation on the downstream side in the conveyance direction. Both plates 520 are rotated to open. After the product 900 passes, the first rotation plate 510 and the second rotation plate 520 on the downstream side in the transport direction are changed from the open state to the closed state.

  While the product 900 is passing through the X-ray leakage prevention curtain 500, the first rotation plate 510 and the second rotation plate 520 on the upstream side in the transport direction are in the closed state or on the downstream side in the transport direction. The first rotating plate 510 and the second rotating plate 520 are in a closed state. Therefore, the X-ray 210 can be prevented from leaking outside the examination room 300.

  As shown in FIG. 7, when the height of the product 900 is a height that does not press against the second rotating plate 520, the product 900 has the first rotating plate 510 on the upstream side in the transport direction and on the downstream side in the transport direction. Is rotated to pass through the X-ray leakage prevention curtain 500. At this time, the second rotating plate 520 on the upstream side in the transport direction and the downstream side in the transport direction does not rotate and remains in the closed state.

  In the present embodiment, the product 900 having a height that is pressed against the second rotating plate 520 passes through the opening 310 with the first rotating plate 510 and the second rotating plate 520 being opened. In addition, the product 900 having a height that does not press against the second rotating plate 520 opens the first rotating plate 510 and opens the opening 310 while keeping the second rotating plate 520 closed. pass. Thereby, the force required when the product 900 passes through the opening 310 of the examination room 300 can be changed according to the height of the product 900 with a simple structure. As a result, the product 900 can easily pass through the opening 310 of the examination room 300. In addition, since the X-ray leakage prevention curtain 500 has a simple structure, the manufacturing cost of the X-ray inspection apparatus 100 can be reduced.

  In the present embodiment, the second rotating plate 520 is suspended from the second rotating shaft 540 and can be closed by its own weight. Thereby, since it is not necessary to use the elastic body for closing the 2nd rotation board 520 of an open state, the manufacturing cost of the X-ray inspection apparatus 100 can be reduced.

  In this embodiment, since the torsion spring 581 is covered with the cover 582, the product 900 can be prevented from coming into direct contact with the torsion spring 581. Thereby, the elastic force of the torsion spring 581 can be maintained. In addition, even if the torsion spring 581 is damaged due to long-term use, the damaged torsion spring 581 can be prevented from coming out of the cover 582. Thereby, it is possible to prevent the damaged torsion spring 581 from being mixed as a foreign substance in the conveyed product 900.

  In the present embodiment, since the first rotating plate 510 and the second rotating plate 520 are made of metal plates, they have excellent durability and are not easily twisted. As a result, a gap is less likely to occur between the first rotating plate 510 and the second rotating plate 520. As a result, the X-ray 210 can be more reliably prevented from leaking outside the examination room 300.

(Second Embodiment)
Next, the X-ray leakage prevention curtain 500a of the X-ray inspection apparatus 100 according to the second embodiment will be described. In addition, about the structure similar to the said 1st Embodiment, the code | symbol similar to 1st Embodiment is attached | subjected and the description is omitted suitably. In the first embodiment, the example in which one first rotating plate 510 is combined with one second rotating plate 520 has been described. However, in the second embodiment, one first rotating plate 510 is combined. Two first rotating plates are combined with two rotating plates 520.

  As shown in FIG. 8, in the X-ray leakage prevention curtain 500a, a pair of first rotation shaft 530 and first rotation plate 510 are provided below the second rotation plate 520, respectively. . The pair of first rotating plates 510 has a double door structure. Further, the pair of first rotating plates 510 are formed so as to partially overlap each other in the closed state. Specifically, one first rotation plate 510 is formed with an extension member 511 that covers a part of the other first rotation plate 510.

  The second rotating plate 520 is formed so as to partially overlap the first rotating plate 510 when in the closed state. In addition, the second rotation plate 520 is arranged on the upstream side in the transport direction of the product 900 from the combined first rotation plate 510.

  As shown in FIG. 9, when the height of the product 900 is high enough to press against the second rotating plate 520, the product 900 has a pair of the first rotating plate 510 and the second rotating plate 520. It is turned to the open state and passes through the X-ray leakage prevention curtain 500a. A pair of 1st rotation board 510 will be in an open state by carrying out the double door opening which opens to both sides from a center.

  As shown in FIG. 10, when the height of the product 900 is a height that does not press against the second rotating plate, the product 900 rotates the pair of first rotating plates 510 to an open state, It passes through the X-ray leakage prevention curtain 500a. At this time, the second rotating plate 520 does not rotate and remains in the closed state.

  In the present embodiment, since the pair of first rotating plates 510 are both opened, the product 900 is easily guided to the center side of the belt conveyor 800. Thereby, the goods 900 can be conveyed stably.

  In the present embodiment, the pair of first rotating plates 510 partially overlap each other when in the closed state, so that a gap is hardly generated between the first rotating plates 510. Thereby, it is possible to more reliably prevent the X-ray 210 from leaking outside the examination room 300.

  Further, in the present embodiment, the first rotating plate 510 and the second rotating plate 520 partially overlap when they are in the closed state, so the first rotating plate 510 and the second rotating plate 520 It becomes difficult to produce a gap between them. Thereby, it is possible to more reliably prevent the X-ray 210 from leaking outside the examination room 300.

  In addition, the second rotation plate 520 is disposed on the upstream side of the first rotation plate 510 in the conveyance direction of the product 900. As a result, the product 900 having a height that does not press against the second rotating plate 520 opens the first rotating plate 510 with the second rotating plate 520 in a closed state. Pass through. As a result, the force required when the product 900 passes through the opening 310 of the examination room 300 can be changed according to the height of the product 900 with a simple structure. It is possible to facilitate passage through the portion 310.

(Third embodiment)
Next, the X-ray leakage prevention curtain 500b of the X-ray inspection apparatus 100 according to the third embodiment will be described. In addition, about the structure similar to the said 1st, 2 embodiment, the code | symbol similar to 1st, 2 embodiment is attached | subjected and the description is omitted suitably. In the first and second embodiments described above, the example in which the first rotating plate 510 and the second rotating plate 520 are each formed from one plate material has been described. In the third embodiment, Each of the first rotation plate 510 and the second rotation plate 520 is formed of a plurality of plate materials.

  As shown in FIG. 11, the first rotating plate 510 includes a plurality of rotating pieces 512 that open and close by rotating about a first rotating shaft 530. The plurality of rotating pieces 512 are formed so as to be flush with each other in the closed state.

  The second rotating plate 520 includes a plurality of rotating pieces 522 that open and close by rotating about the second rotating shaft 540. The plurality of rotating pieces 522 are formed so as to be flush with each other in the closed state.

  As shown in FIG. 12, when the height of the product 900 is high enough to press against the second rotating plate 520, the product 900 includes all the rotating pieces 512 of the first rotating plate 510 and the second rotating plate 512. All or a part of the rotating plate 520 of the rotating plate 520 is rotated to open, and passes through the X-ray leakage prevention curtain 500b. At this time, the number of rotations of the rotation piece 522 of the second rotation plate 520 changes according to the width of the product 900. FIG. 12 shows the X-ray leakage prevention curtain 500b in a state where some of the rotating pieces 522 are rotating.

  As illustrated in FIG. 13, when the height of the product 900 is a height that does not press against the second rotating plate 520, the product 900 has all or part of the rotating pieces of the first rotating plate 510. It is turned to the open state and passes through the X-ray leakage prevention curtain 500b. At this time, the number of rotations of the rotation piece 512 of the first rotation plate 510 changes according to the height of the product 900. Further, all the rotating pieces 522 of the second rotating plate 520 are not rotated and remain in the closed state. In addition, in FIGS. 11-13, the rotation board return part 580 provided in the 1st rotation axis | shaft 530 is abbreviate | omitted, and the X-ray leakage prevention curtain 500b is shown.

  In the present embodiment, the product 900 is an opening of the examination room 300 with the rotating pieces 512 and the rotating pieces 522 that are pressed open while the rotating pieces 512 and the rotating pieces 522 that are not pressed are closed. Go through 310. Thereby, it is possible to change the force required when the product 900 passes through the opening 310 of the examination room 300 according to the height and width of the product 900 with a simple structure. As a result, the product 900 can easily pass through the opening 310 of the examination room 300.

<Modification>
(A)
In the third embodiment, the rotating piece 512 of the first rotating plate 510 partially overlaps with the rotating piece 512 adjacent on the lower side of the rotating piece 512 when in the closed state. It doesn't matter. In that case, the upper rotating piece 512 is disposed upstream of the lower rotating piece 512 in the conveyance direction of the product 900.

  In the present modification, the rotating pieces 512 of the first rotating plate 510 partially overlap each other when in the closed state, so that a gap is hardly generated between the rotating pieces 512. Thereby, it is possible to more reliably prevent the X-ray 210 from leaking outside the examination room 300.

  Further, in the present modification, the turning piece 512 of the first turning plate 510 is disposed on the upstream side in the conveyance direction of the product 900 with respect to the lower turning piece 512. As a result, the product 900 passes through the opening 310 of the examination room 300 with the rotating piece 512 that is pressed open while the rotating piece 512 that is not pressed is closed. As a result, the force required when the product 900 passes through the opening 310 of the examination room 300 can be changed according to the height of the product 900 with a simple structure. It is possible to facilitate passage through the portion 310.

(B)
As shown in FIG. 14, in the X-ray leakage prevention curtain 500 c, the second rotation shaft 540 may be provided in a direction perpendicular to the conveyance surface 810 of the belt conveyor 800. In this case, a rotation plate return portion 580 is provided on the second rotation shaft 540. When the second rotation plate 520 changes from the closed state to the open state, the second rotation plate 520 rotates about the second rotation shaft 540 toward the downstream side in the transport direction.

(C)
The first rotation plate 510 and the second rotation plate 520 may be made of a resin lighter than metal in order to reduce the force required when the product 900 passes through the opening 310. Absent. Moreover, the shape of the 1st rotation board 510 and the shape of the 2nd rotation board 520 may have a some bending part.

(D)
The X-ray leakage prevention curtain 500 has one combination of the first rotation plate 510 and the second rotation plate 520 in order to reduce the manufacturing cost of the X-ray inspection apparatus 100. It doesn't matter. Further, the X-ray leakage prevention curtain 500 combines the first rotation plate 510 and the second rotation plate 520 in order to prevent the X-ray 210 from leaking to the outside of the examination room 300 more reliably. It may have three or more.

(E)
The second rotating plate 520 is formed with an extension member that covers a part of the first rotating plate 510 in order to prevent the X-ray 210 from leaking to the outside of the examination room 300 more reliably. It doesn't matter.

(F)
The elastic body of the rotating plate return portion 580 may be a rubber-like member.

(G)
Only one of the first rotating plate 510 and the second rotating plate 520 may be a rotating piece.

(H)
In the X-ray leakage prevention curtain 500, the first rotation plate 510 provided on the upstream side in the conveyance direction and the first rotation plate 510 provided on the downstream side in the conveyance direction have a vertical width and a horizontal width. They may be the same, or at least one of the vertical width and the horizontal width may be different. Further, the second rotating plate 520 provided on the upstream side in the conveying direction and the second rotating plate 520 provided on the downstream side in the conveying direction may have the same vertical width and horizontal width. In addition, at least one of the vertical width and the horizontal width may be different.

(I)
In the second and third embodiments, the pair of first rotating plates 510 may have the same vertical width and horizontal width, or at least one of the vertical width and horizontal width may be different.

(J)
In the third embodiment, the plurality of rotating pieces 512 of the first rotating plate 510 may have the same vertical width and horizontal width, or at least one of the vertical width and horizontal width may be different. . Further, the plurality of rotating pieces 522 of the second rotating plate 520 may have the same vertical width and horizontal width, or at least one of the vertical width and horizontal width may be different.

(K)
In the first to third embodiments, the examination room 300 may not include the guide guide 700.

100 X-ray inspection apparatus 210 X-ray 300 Inspection room 310 Openings 500, 500a, 500b, 500c X-ray leakage prevention curtain (X-ray leakage prevention member)
510 first rotating plate 512 rotating piece 520 second rotating plate 522 rotating piece 530 first rotating shaft 540 second rotating shaft 581 torsion spring (elastic body)
582 Cover 800 Belt conveyor (conveyance unit)
810 Conveying surface 900 Product (inspection object)

Claims (9)

X-ray leakage for inspecting an object to be inspected conveyed by the conveying unit by irradiating the inside of the inspection room with X-rays and preventing X-ray leakage from an opening used for carrying in or out the object in the inspection room An X-ray inspection apparatus comprising a prevention member, wherein the X-ray leakage prevention member closes the opening when in a closed state, and an inspection object passes through the opening when in an open state;
The X-ray leakage preventing member opens and closes by rotating around a first rotation shaft provided in a direction perpendicular to the transport surface of the transport unit that transports the inspection object horizontally. A rotating plate;
An X-ray inspection apparatus comprising: a second rotating plate that opens and closes by rotating around a second rotating shaft provided above the first rotating shaft.   2. The X-ray according to claim 1, wherein each of the first rotation shaft and the first rotation plate is provided in pairs, and the pair of first rotation plates has a double door structure. Inspection device.   The X-ray inspection apparatus according to claim 2, wherein the pair of first rotating plates are formed so as to partially overlap each other when closed. The second rotation shaft is provided in a direction parallel to the transport surface of the transport unit,
The X-ray inspection apparatus according to claim 1, wherein the second rotating plate is suspended from the second rotating shaft.   The second rotating plate is formed so as to partially overlap the first rotating plate when in the closed state, and is upstream of the first rotating plate in the conveyance direction of the inspection object. The X-ray inspection apparatus according to claim 1, wherein the X-ray inspection apparatus is disposed on the X-ray inspection apparatus. The first rotation shaft includes an elastic body for closing the opened first rotation plate;
The X-ray inspection apparatus according to claim 1, further comprising a cover that covers the elastic body.   At least one of the first rotating plate and the second rotating plate is a plurality of rotating pieces that are opened and closed by rotating about the first rotating shaft or the second rotating shaft. The X-ray inspection apparatus according to claim 1, comprising:   The rotating piece of the first rotating plate partially overlaps the adjacent rotating piece on the lower side of the rotating piece when in the closed state, and is more than the rotating piece on the lower side. The X-ray inspection apparatus according to claim 7, wherein the X-ray inspection apparatus is disposed on the upstream side in the conveyance direction of the inspection object.   The X-ray inspection apparatus according to claim 1, wherein at least one of the first rotating plate and the second rotating plate is made of a metal plate.

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