JP2021099246A - X-ray baggage inspection device - Google Patents

Abstract

To provide an X-ray baggage inspection device of curtain type, the size of which is suppressed from becoming large, and the leakage X-ray amount of which is small, as compared with a general X-ray baggage inspection device of curtain type pertaining to prior art.SOLUTION: An X-ray baggage inspection device 1 comprises a conveyance device 11 and a cover 12. The cover 12 is provided, in the inside of it, with a plurality of X-ray shielding parts 129 arranged so as to project to the inside from each of a side wall part 121R, a side wall part 121L and a ceiling part 122. The X-ray shielding parts 129 are flexible sheet-like members for shielding X-rays, which draw a shape of the letter U that is rotated counterclockwise when seen in the conveyance direction. Some X-ray, out of the X-ray with which an inspection object is irradiated inside of the cover 12, that is reflected at the inside face, etc., of the cover 12 and directed toward an opening of the cover 12 is shielded by the X-ray shielding parts 129 and the amount of X-ray leaking to the outside of the cover 12 is reduced.SELECTED DRAWING: Figure 1

Description

The present invention relates to a technique for an X-ray baggage inspection device.

According to the X-ray baggage inspection device, an image showing the shape of an object that is contained in an object such as a bag and cannot be seen from the outside is displayed. Therefore, the inspector can know what kind of object is contained in the image by looking at the image displayed by the X-ray baggage inspection device without opening the object. Therefore, X-ray baggage inspection devices are widely used in baggage inspection stations at airports and the like.

When the X-rays radiated to the object from the X-ray baggage inspection device leak to the outside, inspectors and the like near the X-ray baggage inspection device are exposed to the X-rays, and if the amount increases, the human body is adversely affected. Therefore, many X-ray baggage inspection devices are provided with a box-shaped housing that shields the X-rays irradiated to the object by the inspection unit from the outside.

The housing of the X-ray baggage inspection device is provided with an opening for taking in and out an object. An X-ray baggage inspection device, called an interlock, is equipped with a door that closes the opening while the object is exposed to X-rays in order to almost completely block the leakage of X-rays from the opening. ing. However, in the case of an interlock type X-ray baggage inspection device, it takes time to open and close the door each time the object is inspected. At airport baggage inspection offices, etc., it is necessary to inspect a large number of baggage in a short time, so a sheet made of a flexible material with low X-ray transmittance (for example, lead-containing) is not an interlock type. A curtain-type X-ray baggage inspection device that closes the opening with a rubber sheet (hereinafter referred to as "X-ray shielding curtain") is often used.

A curtain-type X-ray baggage inspection device leaks more X-rays to the outside than an interlock-type X-ray baggage inspection device. Therefore, in the Garten type X-ray baggage inspection device, a technique for reducing the amount of X-rays leaking to the outside has been proposed. For example, Patent Document 1 includes X-ray shielding curtains installed at the entrance and exit openings of an object provided in the housing, and a plurality of X-ray shielding curtains installed inside the housing. A line inspection device has been proposed.

Japanese Unexamined Patent Publication No. 2016-109622

For example, in the case of the X-ray inspection apparatus described in Patent Document 1, in order to reduce the amount of leaked X-rays, for example, on the upstream side of the two X-ray shielding curtains provided in the housing. The object completely passes under one sheet, the X-ray shielding curtain completely hangs down, and the object is irradiated with X-rays in a state where the object is covered with two X-ray shielding curtains in the housing. Need to be. Therefore, in the X-ray inspection device described in Patent Document 1, the length of the housing in the transport direction of the object is longer than that of the ordinary curtain-type X-ray baggage inspection device.

In view of the above, the present invention provides a curtain-type X-ray baggage inspection device that does not increase in size and leaks less X-rays than a general curtain-type X-ray baggage inspection device according to the prior art. The purpose is to provide.

In order to solve the above-mentioned problems, the present invention is a cover that covers a space in which an object to be inspected by X-rays is irradiated with X-rays, has an opening through which the object enters and exits, and has a side wall surface inside the cover. A X-ray baggage inspection device including a cover having a plurality of portions for shielding X-rays protruding inward from the surface is proposed as a first aspect.

According to the X-ray baggage inspection device of the first aspect, the portion of the cover protruding inward from the side wall surface inside the cover blocks a part of the X-ray toward the opening of the cover and does not reach the opening. Therefore, the amount of leaked X-rays is reduced without increasing the size as compared with the general curtain type X-ray baggage inspection device according to the prior art.

In the X-ray baggage inspection device according to the first aspect, the portion that shields the X-rays protruding inward from the side wall surface has a band shape substantially perpendicular to the transport direction of the object. It may be adopted as the second aspect.

According to the X-ray baggage inspection device of the second aspect, more X-rays can be shielded as compared with the case where the portion protruding inward from the side wall surface inside the cover is, for example, rod-shaped.

In the X-ray baggage inspection device according to the first aspect, the side wall surface is composed of an uneven plate-shaped member, and the portion that shields X-rays protruding inward from the side wall surface is a convex portion of the plate-shaped member. The configuration of being a part may be adopted as the third aspect.

According to the X-ray baggage inspection device of the third aspect, a part of the X-rays reflected by the side wall surface inside the cover and directed toward the opening is blocked by the convex portion of the side wall surface.

In the X-ray baggage inspection device according to any one of the first to third aspects, the portion that shields the X-rays protruding inward from the side wall surface does not limit the transportation of the object even if it touches the object. A flexible configuration may be adopted as the fourth aspect.

According to the X-ray baggage inspection device of the fourth aspect, the transportation of the object is not hindered by the portion protruding inward from the side wall surface inside the cover.

The fifth aspect of the X-ray baggage inspection device according to any one of the first to fourth aspects is a configuration in which a plurality of portions for shielding X-rays protruding inward from the ceiling surface inside the cover are provided. It may be adopted.

According to the X-ray baggage inspection device of the fifth aspect, in addition to a part of X-rays passing near the side wall surface inside the cover and heading for the opening, in addition to passing near the ceiling surface inside the cover and heading for the opening. Part of the X-ray is also blocked.

In the X-ray baggage inspection device according to the fifth aspect, the portion that shields the X-rays protruding inward from the ceiling surface has a band shape substantially perpendicular to the transport direction of the object. It may be adopted as the sixth aspect.

According to the X-ray baggage inspection device of the sixth aspect, more X-rays can be shielded as compared with the case where the portion of the cover that protrudes inward from the ceiling surface has a rod shape, for example.

In the X-ray baggage inspection device according to the fifth aspect, the ceiling surface is composed of an uneven plate-shaped member, and a portion that shields X-rays protruding inward from the ceiling surface is a convex portion of the plate-shaped member. The configuration of being a part may be adopted as the seventh aspect.

According to the X-ray baggage inspection device of the seventh aspect, a part of the X-rays reflected by the ceiling surface inside the cover and directed toward the opening is blocked by the convex portion of the ceiling surface.

In the X-ray baggage inspection device according to any one of the fifth to seventh aspects, the portion that shields the X-rays protruding inward from the ceiling surface does not limit the transportation of the object even if it touches the object. The structure of having flexibility may be adopted as the eighth aspect.

According to the X-ray baggage inspection device of the eighth aspect, the transportation of the object is not hindered by the portion of the cover that protrudes inward from the ceiling surface.

In the X-ray baggage inspection device according to the fifth aspect, the portion that shields X-rays that protrude inward from the side wall surface and the portion that shields X-rays that protrude inward from the ceiling surface are perpendicular to the transport direction. A configuration in which the components are arranged on the same plane may be adopted as the ninth aspect.

According to the X-ray baggage inspection device of the ninth aspect, for example, the portion protruding inward from the side wall surface inside the cover and the portion protruding inward from the ceiling surface inside the cover are arranged alternately in the transport direction of the object. Compared with the case where the ceiling is used, the gap between the protruding portions can be narrowed and more X-rays can be blocked.

In the X-ray baggage inspection device according to the ninth aspect, a portion that shields X-rays that protrude inward from the side wall surface and a portion that shields X-rays that protrude inward from the ceiling surface are integrally formed. The configuration of being used may be adopted as the tenth aspect.

According to the X-ray baggage inspection device of the tenth aspect, there is no gap between the portion protruding inward from the side wall surface inside the cover and the portion protruding inward from the ceiling surface inside the cover. More X-rays are blocked compared to when there are gaps between the parts.

The figure which showed the appearance of the X-ray baggage inspection apparatus which concerns on one Embodiment. The figure which looked at the X-ray baggage inspection apparatus which concerns on one Embodiment from the top, the left side, and the front. The figure for demonstrating the role of the X-ray shielding part which the cover of the X-ray baggage inspection apparatus which concerns on one Embodiment provides inside. The figure which illustrated the shape of the X-ray shielding part which the cover of the X-ray baggage inspection apparatus which concerns on one modification includes inside. The figure which showed an example of the shape of the plate-like member which can be adopted as the side wall part or the ceiling part of the cover of the X-ray baggage inspection apparatus which concerns on one modification.

[Embodiment]
FIG. 1 is a diagram showing the appearance of the X-ray baggage inspection device 1 according to the embodiment of the present invention. However, in FIG. 1, many of the configurations that the X-ray baggage inspection device 1 is provided with in common with the general curtain-type X-ray baggage inspection device according to the prior art are omitted.

The X-ray baggage inspection device 1 includes a transport device 11 and a cover 12 as components that can be visually recognized from the outside. In FIG. 1, the X-ray shielding curtain arranged so as to close the opening on the upstream side and the opening on the downstream side of the cover 12 is omitted.

The transport device 11 is, for example, a belt conveyor, and transports an object placed on the transport surface from, for example, from the front right to the back left in FIG. Hereinafter, the direction in which the transport device 11 transports the object is simply referred to as a “transport direction”.

The cover 12 is composed of a box-shaped upper portion 12U that covers the upper side of the transport device 11 and has an open lower surface, and a box-shaped lower portion 12B that covers the lower side of the transport device 11 and has an open upper surface. .. The upper portion 12U of the cover 12 is provided with openings on the upstream side and the downstream side in the transport direction so that the object transported by the transport device 11 can pass through the inside thereof. The cover 12 is made of a material such as lead, and serves to shield the X-rays emitted inside the cover 12 from the outside.

An X-ray irradiation unit 15 elongated in the left-right direction is arranged on the upper side of the lower bottom surface of the lower surface portion 12B of the cover 12. Further, an elongated line sensor 17 is arranged in the left-right direction on the lower side of the upper bottom surface of the upper portion 12U of the cover 12. The X-ray irradiation unit 15 irradiates the band-shaped X-ray 8 from the bottom to the top. The line sensor 17 receives the X-ray 8 emitted from the X-ray irradiation unit 15 and measures the intensity thereof. The intensity of the X-ray 8 measured by the line sensor 17 when the object 9 passes through the X-ray 8 from the upstream side to the downstream side changes according to the level of the transmittance of the X-ray 8 in each part of the object 9. To do. Therefore, the shape of the object contained inside the object 9 appears in the image (X-ray image) showing the intensity of X-rays measured by the line sensor 17 in shades.

The upper portion 12U of the cover 12 includes a plurality of X-ray shielding portions 129 inside. The plurality of X-ray shielding portions 129 are arranged at intervals from each other in the transport direction. Further, in FIG. 1 and FIGS. 2 and 3 described later, the intervals between the adjacent X-ray shielding portions 129 are assumed to be equal, but the intervals may be different.

The X-ray shielding portion 129 is a flexible plate-shaped member that shields X-rays. Examples of the material of the X-ray shielding portion 129 include a rubber sheet containing lead. The X-ray shielding unit 129 draws a shape in which a "U" is rotated 90 degrees counterclockwise when viewed in the transport direction, so that the plate-shaped plane is substantially perpendicular to the transport direction. Is located in.

The X-ray shielding portion 129 includes a band-shaped portion that protrudes inward from the right side wall portion 121R inside the cover 12, a band-shaped portion that protrudes inward from the left side wall portion 121L inside the cover 12, and a cover. A band-shaped portion protruding inward from the ceiling portion 122 inside the 12 is integrally formed.

FIG. 2 is a view of the X-ray baggage inspection device 1 from above (FIG. 2 (A)), a view from the left side (FIG. 2 (B)), and a view from the front (FIG. 2 (C)). However, in order to show the state of the X-ray shielding portion 129 arranged inside the cover 12, the ceiling portion 122 of the cover 12 is removed in FIG. 2 (A), and FIG. 2 (B) shows. In, the side wall portion 121L on the left side of the cover 12 is removed, and in FIG. 2C, the wall portion 123 on the front side of the cover 12 (having an opening and counterclockwise in a "U" shape). The wall portion in the shape of being rotated 90 degrees) and the X-ray shielding curtain 14 have been removed.

The object 9 placed on the transport surface on the upstream side of the cover 12 of the transport device 11 is transported in the direction of the arrow in FIG. 2 (convey direction). The object 9 first passes through the opening on the upstream side of the cover 12 and enters the inside of the cover 12. At that time, the object 9 passes under the X-ray shielding curtain 14 hanging so as to close the opening on the upstream side of the cover 12.

Inside the cover 12, the object 9 is inspected by the X-ray 8 emitted from the X-ray irradiation unit 15, and then passes through the opening on the downstream side of the cover 12 and goes out of the cover 12. At that time, the object 9 passes under the X-ray shielding curtain 16 hanging so as to close the opening on the downstream side of the cover 12.

When the object 9 passes through the inside of the cover 12, even if the object 9 touches any of the X-ray shielding portions 129, the X-ray shielding portion 129 is flexible and is therefore pushed away by the object 9. As such, the transport of the object 9 is not restricted.

FIG. 3 is a diagram for explaining the role of the X-ray shielding unit 129. Note that FIG. 3A is a view of the X-ray baggage inspection device 1 viewed from above, and FIG. 3B is a view of the X-ray baggage inspection device 1 viewed from the left side.

A part of the X-rays emitted from the X-ray irradiation unit 15 toward the line sensor 17 is a portion of the transport surface of the transport device 11 and a structure arranged under the transport surface (a plate that supports the belt of the transport device 11 from below). Etc.), it reflects in various directions. A part of those X-rays goes to the side wall portion 121R or the side wall portion 121L of the upper portion 12U of the cover 12, as shown by the solid line arrow in FIG. 3 (A). Further, a part of those X-rays goes to the ceiling portion 122 constituting the upper bottom surface of the upper bottom portion 12U of the cover 12 as shown by the solid line arrow in FIG. 3 (B).

The X-ray shielding portion 129 shields a part of the X-ray toward the side wall portion 121R, the side wall portion 121L, or the ceiling portion 122 as described above. As a result, as shown by the broken line arrow in FIG. 3A or FIG. 3B, the reflection is reflected at the side wall portion 121R, the side wall portion 121L, or the ceiling portion 122, and the upstream side of the upper portion 12U of the cover 12 or A part of the X-rays going toward the opening on the downstream side does not reach the opening. As a result, as compared with the case where the X-ray shielding portion 129 is not provided, the amount of X-rays leaking from the gap between the X-ray shielding curtain 14 on the upstream side and the wall portion 123 in front of the upper portion 12U of the cover 12 and the amount of X-rays leaked. The amount of X-rays leaking from the gap between the X-ray shielding curtain 16 on the downstream side and the wall portion 124 on the back surface of the upper portion 12U of the cover 12 is reduced.

According to the above-mentioned X-ray baggage inspection device 1, the amount of X-rays leaked to the outside is the same size as a general curtain-type X-ray baggage inspection device according to the prior art without the X-ray shielding unit 129. Can be reduced.

[Modification example]
The above-mentioned X-ray baggage inspection device 1 is an example of the X-ray baggage inspection device according to the present invention, and may be variously modified within the scope of the technical idea of the present invention. Examples of these modifications are shown below. Two or more of the following modifications may be combined as appropriate.

(1) The X-ray shielding portion 129 included in the above-mentioned X-ray baggage inspection device 1 has a portion protruding inward from the side wall portion 121R, a portion protruding inward from the side wall portion 121L, and a portion protruding inward from the ceiling portion 122. It is composed of parts. Instead of this, the X-ray shielding portion 129 is composed of a portion that protrudes inward from the side wall portion 121R and a portion that protrudes inward from the side wall portion 121L, and does not have a portion that protrudes inward from the ceiling portion 122. Good. FIG. 4A is a diagram showing the shape of an example of the X-ray shielding portion 129 according to this modified example. In FIGS. 4A to 4D, the lower portion 12B of the cover 12 and the X-ray irradiation portion 15 are omitted.

(2) The X-ray shielding portion 129 included in the above-mentioned X-ray baggage inspection device 1 has a portion protruding inward from the side wall portion 121R, a portion protruding inward from the side wall portion 121L, and a portion protruding inward from the ceiling portion 122. The parts are integrally formed. Instead of this, the portion of the X-ray shielding portion 129 that protrudes inward from the side wall portion 121R, the portion that protrudes inward from the side wall portion 121L, and the portion that protrudes inward from the ceiling portion 122 are separated. May be good. FIG. 4B is a diagram showing the shape of an example of the X-ray shielding portion 129 according to this modified example.

When the portion protruding inward from the side wall portion 121R constituting the X-ray shielding portion 129, the portion protruding inward from the side wall portion 121L, and the portion protruding inward from the ceiling portion 122 are separated from each other. If the portion is arranged on the same plane perpendicular to the transport direction, the gap becomes narrow, which is desirable from the viewpoint of reducing X-ray leakage.

However, when the portion protruding inward from the side wall portion 121R constituting the X-ray shielding portion 129, the portion protruding inward from the side wall portion 121L, and the portion protruding inward from the ceiling portion 122 are separated from each other. Parts may be arranged at different positions in the transport direction. FIG. 4C is a diagram showing the shape of an example of the X-ray shielding portion 129 according to such a modified example.

(3) A portion protruding inward from the side wall portion 121R constituting the X-ray shielding portion 129 included in the above-mentioned X-ray baggage inspection device 1, a portion protruding inward from the side wall portion 121L, and a portion protruding inward from the ceiling portion 122. Each part is strip-shaped. The shape of these parts is not limited to the band shape. FIG. 4D is a diagram showing the shape of an example of the X-ray shielding portion 129 according to this modified example.

(4) Instead of or in addition to the cover 12 of the X-ray baggage inspection device 1 provided with the X-ray shielding portion 129, one or more of the side wall portion 121R, the side wall portion 121L, and the ceiling portion 122 of the cover 12 are uneven. It may be composed of a plate-shaped member having a ceiling. In this case, the convex portion of the plate-shaped member having irregularities shields a part of the X-rays emitted from the X-ray irradiation unit 15 toward the opening of the cover 12. FIG. 5 is a diagram showing an example of the shape of a plate-shaped member that can be adopted for the side wall portion 121R, the side wall portion 121L, or the ceiling portion 122 of the cover 12 according to this modification.

1 ... X-ray baggage inspection device, 9 ... Object, 11 ... Transport device, 12 ... Cover, 14 ... X-ray shielding curtain, 15 ... X-ray irradiation unit, 16 ... X-ray shielding curtain, 17 ... Line sensor, 121R. 121L ... Side wall, 122 ... Ceiling, 123.124 ... Wall, 129 ... X-ray shielding.

Claims (10)

A cover that covers a space in which an object to be inspected by X-rays is irradiated with X-rays, has an opening through which the object enters and exits, and shields X-rays that protrude inward from the side wall surface inside the cover. An X-ray baggage inspection device with multiple covers. The X-ray baggage inspection device according to claim 1, wherein the portion that shields the X-rays protruding inward from the side wall surface has a band shape substantially perpendicular to the transport direction of the object. The X-ray baggage inspection device according to claim 1, wherein the side wall surface is composed of an uneven plate-shaped member, and a portion that shields X-rays protruding inward from the side wall surface is a convex portion of the plate-shaped member. The X-ray baggage according to any one of claims 1 to 3, wherein the portion that shields the X-rays protruding inward from the side wall surface has flexibility that does not limit the transport of the object even if the object touches it. Inspection device. The X-ray baggage inspection device according to any one of claims 1 to 4, further comprising a plurality of portions that shield X-rays protruding inward from the ceiling surface inside the cover. The X-ray baggage inspection device according to claim 5, wherein the portion that shields the X-rays protruding inward from the ceiling surface has a strip shape substantially perpendicular to the transport direction of the object. The X-ray baggage inspection device according to claim 5, wherein the ceiling surface is composed of an uneven plate-shaped member, and a portion that shields X-rays protruding inward from the ceiling surface is a convex portion of the plate-shaped member. The X-ray baggage according to any one of claims 5 to 7, wherein the portion that shields the X-rays protruding inward from the ceiling surface has flexibility that does not limit the transport of the object even if the object touches it. Inspection device. The fifth aspect of claim 5, wherein the portion that shields X-rays that protrude inward from the side wall surface and the portion that shields X-rays that protrude inward from the ceiling surface are arranged on the same plane perpendicular to the transport direction. X-ray baggage inspection device. The X-ray baggage inspection apparatus according to claim 9, wherein a portion that shields X-rays that protrude inward from the side wall surface and a portion that shields X-rays that protrude inward from the ceiling surface are integrally formed.

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