JP3190710U - X-ray shielding noren and X-ray inspection apparatus equipped with the same - Google Patents

Abstract

Provided are a shielding structure having a new structure in which X-rays do not leak to the outside even when an object to be inspected pushes up shielding material, and an X-ray inspection apparatus equipped with the shielding material.
A shielding nore that shields an entrance / exit of an X-ray examination room by an X-ray shielding member (65), a first shielding member (61) for closing the entrance / exit of the X-ray examination room, and an inner side of the first shielding member (61). A second shielding member 62. The first shielding member 61 is formed with an opening 64 large enough to pass the object to be inspected, and a second shielding member 62 that closes the opening 64 from the inside is provided so as to move freely. Even if the inspection object pushes up the second shielding member 62, X-rays are prevented from leaking from the opening 64.
[Selection] Figure 3

Description

The present invention relates to an X-ray inspection apparatus that inspects the quality of an inspection object by irradiating the inspection object with X-rays.
In particular, the present invention relates to an X-ray leakage prevention structure at an entrance / exit of an inspection room where an inspection object is carried in / out.

In this type of X-ray inspection apparatus, an X-ray shielding member is provided at the entrance / exit of the examination room in order to prevent X-ray leakage from the entrance / exit of the examination room. As a form of this shielding member, a shield noren (see Patent Document 1) hung from the entrance and exit, a tunnel-type protective cover (see Patent Document 2) immediately before entering the examination room, and immediately after leaving the examination room In some cases, scattered X-rays leaking from the examination room are shielded by a protective cover.

Since the latter protective cover is provided on each of the entrance side and the exit side of the examination room, there is a disadvantage that the entire apparatus becomes long. On the other hand, since the former shielding nolen is provided in the entrance / exit of the examination room or the examination room, there is an advantage that the entire apparatus becomes compact.

JP-A-11-160487 JP 2002-82070 A

However, since the conventional shielding noren is formed by suspending a plurality of strip-like shielding members arranged in the horizontal direction, when a part of the shielding nolen is pushed up by the object to be inspected, the pushed up shielding nolen is pushed up. There is a risk that X-rays leak from there because the space between the shielded noren and the non-shielded noren is opened.

Further, since the shielding noren is suspended over the entire width of the entrance / exit, there is also a problem that it is not preferable for safety because a hand can be put into the inspection room from there.

In order to solve these problems, the present invention provides a new structure of shielding noren that prevents X-rays from leaking to the outside even when the object to be inspected pushes up the shielding noren, and an X-ray inspection apparatus equipped with the shielding nolen. It is an issue to provide.

In order to solve the above problems, a shielding nolen of the present invention shields an entrance of an X-ray examination room with an X-ray shielding member, and includes a first shielding member for closing the entrance of the X-ray examination room, A second shielding member positioned inside the first shielding member, and the first shielding member is formed with an opening having a size that allows the inspection object to pass therethrough, and the second shielding member includes the opening. It is formed in a size to be closed, and is suspended from a rotating shaft so as to be freely slidable.

Here, the inside means the X-ray examination room. Then, the entrance / exit of the X-ray examination room (hereinafter referred to as the examination room) is shielded by the first shielding member, leaving an opening having a size through which the inspection object can pass. Further, since the second shielding member that closes the opening is slidably suspended inside the opening, unless the object to be inspected pushes up the second shielding member, the opening is inspected from the inspection room. Scattered X-rays will not leak.

When the inspection object enters from the opening and pushes up the second shielding member, the inspection chamber and the outside communicate with each other through the opening, while the inspection object enters the opening. Since the inspected object itself attenuates scattered X-rays in the inspection chamber, there is almost no possibility that the scattered X-rays leak from the opening.

Further, when the inspection object passes through the opening, since the opening is temporarily opened until the pushed-up second shielding member is closed, scattered X-rays leak from the opening. There is a fear. Therefore, the present invention is characterized in that the opening formed in the first shielding member and the second shielding member are communicated with each other by a tunnel-like shielding member.

When the object to be inspected passes through the opening, the opening is temporarily opened for a short time until the pushed-up second shielding member is closed, but between the second shielding member and the opening. Since a tunnel-shaped shielding member is provided in the inspection room, even if the inside of the tunnel communicates with the outside or there is a considerable gap between the opening and the object to be inspected, Since the X-rays are attenuated in the tunnel, there is no possibility that the scattered X-rays leak from the opening.

Further, the present invention is characterized in that a plurality of the shielding norens are arranged along the direction in which the inspection object is conveyed, and the first shielding members of the respective shielding norens are communicated with each other by a tunnel-like shielding member.

Even if the shielding noren on the entrance / exit side is opened and the inside of the tunnel communicates with the outside, the scattered X-rays in the examination room pass through the inside of the tunnel-like shielding member as long as the inside shielding noren connected to the tunnel is closed. There is no leakage to the outside. Similarly, even if the inner shielding nozzle is open, the scattered X-rays will not leak out if the shielding nozzle on the entrance / exit side is closed. Therefore, scattered X-rays from the entrance / exit of the examination room can be obtained by sequentially carrying them into the examination room while keeping the interval between the inspected objects appropriately so that the plurality of second shielding members connected to the front and rear are not simultaneously opened. Can be eliminated at all.

In addition, the X-ray inspection apparatus of the present invention includes a conveying means for carrying an object into and out of the X-ray inspection chamber,
An X-ray source that irradiates the inspection object conveyed by the conveying means with X-rays, a line sensor that detects X-rays transmitted through the inspection object, and a transmission X-ray image detected by the line sensor. An X-ray inspection apparatus for inspecting an inspection object, wherein an inspection object is conveyed to each of an entrance side and an exit side in the inspection room with an X-ray irradiation region from the X-ray source to the line sensor interposed therebetween A plurality of the shielding norens are arranged along the direction, and the first shielding members of the shielding norens are communicated with each other by a tunnel-like shielding member.
Thereby, even if a 2nd shielding member will be in an open state, X-ray leakage from there can be made completely. Further, the entrance / exit of the examination room is closed leaving a small opening through which the object to be inspected can be passed, so that it is possible to eliminate the risk of entering the examination room from there.

According to the shielding nolen of the present invention, an opening of a size that allows the inspection object to pass through is provided in the first shielding member that blocks the entrance / exit of the X-ray examination room, and is suspended freely movably inside the opening. Since the second shielding member is provided, even if the second shielding member is pushed up by the object to be inspected, the opening is only opened to allow the object to be inspected. Leakage can be reduced more than ever.

In addition, since the opening formed in the first shielding member and the second shielding member are communicated with each other by the tunnel-shaped shielding member, the pushed-up second shielding member is opened, and the inspection chamber communicates with the outside. However, since scattered X-rays in the examination room are attenuated in the tunnel, X-ray leakage from the opening of the entrance / exit can be further reduced.

Further, a plurality of the shielding norens are arranged along the direction of conveyance of the inspection object, and the first shielding members of the respective shielding norens are communicated with each other by a tunnel-like shielding member, so that the shielding noren on the entrance / exit side is opened. Even in this case, the scattered X-rays are shielded by the inner shielding nore that communicates therewith, so that a more complete leakage prevention structure can be obtained.

As described above, since the tunnel-shaped shielding member and the shielding nolen are provided in the examination room in a multiple manner to prevent X-ray leakage, the X-ray leakage is prevented even if the second shielding member 62 is made thinner. be able to. Therefore, there is a merit that the shield nolen according to the present invention can be used even with a light object A for which the shield noren cannot be used until now.

In addition, according to the X-ray inspection apparatus using the shielding nolen of the present invention, the entrance / exit of the examination room is covered with the first shielding member, leaving an opening large enough to pass the object to be inspected. Therefore, it is possible to make the X-ray inspection apparatus safer than the conventional apparatus.

1 is an external perspective view of an X-ray inspection apparatus according to an embodiment of the present invention. The figure which shows the structure of the shielding nolen which concerns on one Embodiment of this invention. Partial external perspective view showing the mounting structure of the shielding noren Partial external perspective view showing attachment structure of second shielding member

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view of an X-ray inspection apparatus according to the present invention. In this figure, X-ray inspection apparatus 1
Includes an inspection chamber 4 having an entrance 2 and an exit 3, a transport means 5 provided from the entrance 2 to the exit 3, a shielding nole 6 for preventing X-ray leakage from the entrance 2 and the exit 3, and transport An X-ray source 7 provided above the central portion of the means 5, and a line sensor 8 provided between the upper and lower belts of the conveying means 5 for detecting X-rays transmitted through the inspection object (see FIG. 2); , A housing 9 storing these, an operation touch panel 10 provided on an upper front surface of the housing 9, and 4 supporting the housing 9
And a book support leg 11.

As a matter of course, the housing 9 has a structure in which X-rays do not leak outside, except for the entrance 2 and the exit 3 of the examination room 4. Further, the X-rays irradiated from the X-ray source 7 are narrowed down into a fan-shaped beam via the collimator 71 shown in FIG. 2, and this is irradiated onto the line sensor 8 and converted into an image signal. The converted image signal is input to a built-in computer and formed into a transmission X-ray image, and various inspections are performed based on the image. Since such a configuration is well known, a detailed description of each part except the shielding noren 6 is omitted here.

FIG. 2 shows the configuration of the shielding nolens 6 arranged in the examination room 4, FIG. 3 shows a partial external perspective view of the shielding nolens 6, and FIG. 4 shows a partial external perspective view of the second shielding member 62. Indicates. In these drawings, the shielding nolen 6 is separated into the shielding nolen 6a on the entrance side 2 and the shielding nolen 6b on the exit side 3 with the X-ray irradiation region R emitted from the collimator 71 interposed therebetween.

The shielding noren 6a on the entrance side 2 includes an outer shielding plate 60 that closes the entrance 2 from the inside, first left and right shielding members 61 and 61 that define the inside of the examination room 4 inside thereof, and a first shielding member 61 disposed between them. Two shielding members 62 to 62, an inner shielding plate 63 that partitions the X-ray irradiation region R, and a second shielding member 62 provided between the inner shielding plate 63 and the first shielding member 61 adjacent thereto. I have.

On the other hand, the shielding noren 6b on the outlet side 3 is disposed between the outer shielding plate 60 that closes the outlet 3 from the inside, the first shielding members 61 and 61 on the left and right that divide the inside of the examination room 4, and the first shielding members 61 and 61 therebetween. The second shielding member 62 to 62, the inner shielding plate 63 that partitions the X-ray irradiation region R, the inner shielding plate 63, and the second shielding member provided between the first shielding member 61 adjacent to the inner shielding plate 63. 62. And by sandwiching the X-ray irradiation region R between the left and right inner shielding plates 63, 63,
Confined scattered X-rays.

These shielding members 61 to 62 and shielding plates 60 and 63 can be composed of a lead plate, a tungsten plate, a stainless steel plate, or the like that shields X-rays. An opening 64 (see FIG. 3) having a size of 5 mm is formed. Each opening 64 has a
A tunnel-shaped shielding member 65 formed of stainless steel or the like is fitted into the shielding member 65.
Thus, a conveyance path for guiding the inspection object A from the inlet 2 to the outlet 3 is formed.

The outer shielding plates 60 and 60 of the entrances 2 and 3 are formed to have a size capable of closing the entrances 2 and 3 from the inside, and the first shielding members 61 to 61 are sized to divide the inside of the examination room 4 into left and right. Is formed. In addition, hooks 66 to 66 are formed at two upper portions of each of the first shielding members 61 to 61, and these hooks 66 to 66 are hooked on horizontal shafts 41 to 41 provided in the examination chamber 4, The entire shielding norens 6 a and 6 b are slightly lifted from the conveying means 5.

An opening / closing door 40 that can be opened downward is provided on the front side of the examination room 4 in FIG. 1, and the opening / closing door 40 is tilted forward to open, and the hooks 66 to 66 of the shielding noren 6 are connected to the horizontal axes 41 to 41. The shield nolen 6 can be taken out of the examination room 4 if it is removed. Further, if the hooks 66 to 66 are hooked on the horizontal shafts 41 to 41 in the reverse procedure, the shield noren 6 can be mounted in the examination room 4.

The tunnel-shaped shielding member 65 is formed in a U shape with an open bottom surface, and its end is connected to the opening 64 of each of the outer shielding plate 60 and the inner shielding plate 63. As shown in FIG. 4, brackets 67 and 67 are attached to both front and rear side surfaces of the shielding member 65, and a rotary shaft 68 extending in the horizontal direction is attached between the brackets 67 and 67. When the second shielding member 62 is fixed to the inspection object A being conveyed hits the second shielding member 62, the second shielding member 62 is pushed up around the rotation shaft 68. Therefore, an opening 69 for releasing the pushed up second shielding member 62 is formed on the upper surface of the tunnel-shaped shielding member 65.

In addition, a regulating plate 67a is spanned between the front and rear brackets 67, 67, and when the pushed-up second shielding member 62 swings back about the rotating shaft 68, the regulating plate 67a becomes the second shielding member. The rotation of the upper end portion 62a of 62 is restricted. Thereby, when the 2nd shielding member 62 shakes in the reverse direction to the conveyance direction F of the to-be-inspected object A, it contacts with the to-be-inspected object A and prevents the conveyance pitch from being disturbed.

The second shielding member 62 is formed of a single stainless steel plate, and its lateral width is slightly smaller than the lateral width inside the tunnel-shaped shielding member 65. Further, the height of the second shielding member 62 is formed higher than the height of the tunnel-shaped shielding member 65, and the upper end portion 62 a protruding upward from the shielding member 65 is a rotation provided above the shielding member 65. The second shielding member 62 is attached to the shaft 68 and swings in the shielding member 65 around the rotation shaft 68.

The opening 64 formed by the tunnel-shaped shielding member 65 preferably has a shape in which a slight gap is formed between the opening A and the inspection object A passing therethrough. Since the shielding member 65 attenuates scattered X-rays in the examination room 4, the tunnel-like shielding member 65 may be formed in a shape that allows the inspection object A to pass therethrough with a margin.

Further, in order to allow the inspection object A to enter the opening 64, on the upstream conveying belt 50a,
A guide for guiding the inspection object A to the opening 64 may be provided. In this embodiment, the shielding norens 6a and 6b are provided on the inlet 2 side and the outlet 3 side, respectively. However, the left and right shielding norens 6a and 6b are integrated, or further divided as necessary. You may do it.

The conveying means 5 includes a pulley 51 on the inlet 2 side, a pulley 52 on the outlet 3 side, a tension roller 53, an idler roller 54, an endless belt 55 that travels between them, and a pulley 52 on the outlet side. It is comprised with the motor which is not illustrated to rotate.

In use, the X-ray inspection apparatus 1 is driven to irradiate X-rays. In this state, the entrances 2 and 3 of the inspection room 4 are provided with the outer shielding plates 60 and 60 and the first shielding members 61 to 61. Further, the opening 64 that communicates with the examination chamber 4 and communicates with the examination room 4 is shielded by a plurality of second shielding members 62 and a tunnel-shaped shielding member 65 that surrounds the second shielding member 62. X-rays do not leak outside.

In this state, when the upstream and downstream conveyor belts 50a and 50b are driven and the inspection object A is carried into the opening 64, the inspection part A pushes up the second shielding member 62 of the shielding noren 6a. Enter the examination room 4. However, since the front side of the inspection object A is closed by the tunnel-shaped shielding member 65 and the plurality of second shielding members 62 and 62 further downstream, X-rays do not leak from the opened opening 64. .

When the inspection object A passes through the first second shielding member 62, the first second shielding member 62 is closed before the inspection object A reaches the X-ray irradiation region R. X-rays do not leak outside. Further, even if the inspection object A enters the X-ray irradiation region R, the upstream and downstream sides of the irradiation region R are sandwiched between the left and right inner shielding plates 63, 63, so that the scattered X-rays are There is no worry of reaching 3. Further, each opening 64 connected to the X-ray irradiation region R is communicated by a tunnel-shaped shielding member 65 and is blocked by the plurality of second shielding members 62 to 62 multiple times. X-rays do not leak from the opening 64 of the X-ray tube.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this, Other aspects are employable. For example, if the inspection object A is a lightweight object, the second
A balance weight is attached above the rotating shaft 68 of the shielding member 62 so that the second force can be obtained even with a slight force.
The shielding member 62 may jump up. Further, the second shielding member 62 may be formed of a tungsten plate, lead rubber, or the like, or a plurality of shielding plates formed in a strip shape may be arranged side by side.

1 X-ray inspection equipment 2 Entrance 3 Exit 4 X-ray inspection room (inspection room)
DESCRIPTION OF SYMBOLS 5 Conveyance means 6 Shielding noren 7 X-ray source 8 Line sensor 9 Case 10 Touch panel 11 Support leg 61 1st shielding member 62 2nd shielding member 64 Opening 65 Tunnel-shaped shielding member
A Inspection object F Transport direction R X-ray irradiation area

Claims (4)

An entrance of the X-ray examination room is shielded by an X-ray shielding member, and includes a first shielding member that closes the entrance of the X-ray examination room, and a second shielding member that is positioned inside the first shielding member. The first shielding member is formed with an opening having a size that allows the inspection object to pass therethrough, and the second shielding member is formed to have a size that closes the opening, so that the first shielding member can swing freely from the rotation shaft. Shield noren characterized by being suspended. The shielding noren according to claim 1, wherein an opening formed in the first shielding member and the second shielding member are communicated with each other by a tunnel-like shielding member. A plurality of the shielding norens are arranged along the direction of conveyance of the inspection object, and the first shielding members of the respective shielding norens are communicated with each other by a tunnel-like shielding member. Shielded nolen as described. Conveying means for carrying in / out the inspection object into / from the X-ray inspection room, an X-ray source for irradiating the inspection object conveyed by the conveying means with X-rays, and a line for detecting X-rays transmitted through the inspection object An X-ray inspection apparatus that inspects an object to be inspected based on a sensor and a transmission X-ray image detected by a line sensor, sandwiching an X-ray irradiation region from the X-ray source to the line sensor, A plurality of the shielding norens according to claim 1 or 2 are arranged on each of an entrance side and an exit side in the inspection room along a conveyance direction of the inspection object, and the first shielding member of each of the shielding norens. An X-ray inspection apparatus characterized in that the space is communicated with a tunnel-shaped shielding member.

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