JP7200001B2 - X-ray inspection device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an X-ray inspection apparatus for inspecting an object to be inspected transported in a housing with X-rays, and more particularly, to an X-ray inspection apparatus provided with a shielding member for preventing X-ray leakage from the entrance and exit of the housing. The present invention relates to an X-ray inspection apparatus that stabilizes transportation by reducing the impact received when an object to be inspected that is transported in a housing passes through a shielding member.

Patent Literature 1 listed below discloses an invention of an X-ray foreign matter detector. The X-ray foreign matter detection apparatus of the present invention comprises a housing 3, a belt conveyor 8 for conveying an object to be inspected along a conveying path in the housing 3, and irradiating the object to be inspected conveyed by the belt conveyor 8 with X-rays. An X-ray generator 11, an X-ray detector 12 for detecting X-rays transmitted through an object to be inspected, a horizontal shaft 22 provided on a conveying path perpendicular to the conveying direction Y of the belt conveyer 8, and a horizontal shaft 22. and an X-ray shielding curtain 20 composed of a plurality of strip-shaped curtain pieces 23 attached at the proximal end thereof and suspended from a horizontal shaft 22 so as to be swingable. The curtain piece 23 can swing toward the downstream side in the conveying direction Y with respect to the vertical direction, but is restricted from swinging toward the upstream side in the conveying direction Y, and furthermore, when its tip end side is in a stationary state, it can swing toward the downstream side in the conveying direction Y. Since it is arranged in the position, it is difficult to pierce the object to be inspected, and the risk of leakage of X-rays is reduced.

JP 2012-159355 A

In the X-ray foreign matter detection apparatus described in Patent Document 1, as described above, the side of the tip of the curtain piece 23 contacting the object to be inspected is curved to avoid piercing the object to be inspected. However, since the curtain piece 23 is swingably suspended on the horizontal shaft 22, when the inspected object pushes the curtain piece downstream and passes through it, the curtain piece swings upstream. It will collide with the following inspected object.

The curtain piece is made of metal such as stainless steel for the purpose of X-ray shielding, and has a corresponding weight. For this reason, when it swings upstream after passing the object to be inspected and collides with the following object to be inspected, it gives a large impact force to it. In this case, especially if the object to be inspected is a light product weighing less than 100 g, the object to be inspected may float up from the conveying surface due to the collision with such a curtain piece, resulting in a momentary stop (instantaneous power failure). There is In addition, when an object to be inspected slips through the curtain piece, the object to be inspected moves while being caught by the swinging curtain piece, and thus receives a large frictional resistance, which may decelerate or stop the object. If this happens, the timing of the X-ray inspection to be received on the downstream side will be shifted, affecting the accuracy of the X-ray inspection. Become. It should be noted that the influence of such collisions of curtain pieces on the inspection accuracy, etc., typically occurs in the case of lightweight products as illustrated above, but this is not necessarily the only case. It can also occur with inspected objects of various sizes and weights.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional techniques and problems thereof, and is intended to suppress lifting or momentary interruption of an object to be inspected when it collides with a shielding member such as a curtain. An object of the present invention is to provide an X-ray inspection apparatus capable of stable transportation and inspection by reducing the frictional resistance of an inspection object.

The X-ray inspection apparatus 1 according to claim 1,
a housing 2 having a shielding structure provided with an entrance 6 and an exit 7 for the object to be inspected W;
a conveying means 3 for conveying the inspected object W along the conveying direction C inside the housing 2;
X-ray irradiating means 4 for irradiating X-rays to the inspected object W conveyed in the housing 2 by the conveying means 3;
X-ray detection means 5 for detecting X-rays transmitted through the object W to be inspected;
An X-ray inspection apparatus 1 having
An inclined surface provided above the conveying means 3 in the housing 2 and inclined so that the distance from the conveying means 3 becomes narrower in the conveying direction C is provided to the inspected object W to be conveyed. shielding members 9, 9b, and 9c that move upward when the inclined surfaces come into contact with each other and move downward when the inclined surfaces separate from the object to be inspected W;
It includes a shielding wall 8 provided on the upper wall of the housing 2 and is made of an X-ray shielding material. a support mechanism 11 that freely supports and allows upward and downward movement of the transported inspection object W;
characterized by having X-ray shielding means 10, 10b, 10c, 10d with

The X-ray inspection apparatus 1 according to claim 2 is the X-ray inspection apparatus 1 according to claim 1,
The support mechanism 11 is
A lower position where the shielding members 9, 9b, and 9c hang down due to their own weight, and an upper position where the shielding members 9, 9b, and 9c are pushed up by the object W to be inspected and allow the object W to pass. The shielding members 9, 9b, 9c are provided with guide portions 8, 13 for guiding the shielding members 9, 9b, 9c so as to move up and down between positions.

The X-ray inspection apparatus 1 according to claim 3 is the X-ray inspection apparatus 1 according to claim 1,
The support mechanism 11 is
Between a lower position where the shielding members 9, 9b, and 9c hang down by their own weight, and an upper position where the shielding member 9 is pushed up by the object W to be inspected and allows the object W to pass. guide portions 8 and 21 for vertically movably guiding the shielding member 9;
urging means 23 provided in the guide portions 8 and 21 for urging the shielding member 9 in the lower position toward the upper position;
It is characterized by comprising

The X-ray inspection apparatus 1 according to claim 4 is the X-ray inspection apparatus 1 according to one of claims 1 to 3,
The shielding member 9 is characterized in that the inclined surface that contacts the object W to be inspected is a curved surface.

According to the X-ray inspection apparatus described in claim 1,
When the object to be inspected conveyed by the conveying means contacts the inclined surface of the shielding member that is allowed to move only in the vertical direction by the support mechanism, the shielding member is pushed by the object to be inspected without changing its position in the conveying direction. It begins to move upward and gradually moves upward as it progresses in the conveying direction. If the shape of the object to be inspected is a rectangular parallelepiped, the shielding member reaches the uppermost position when the tip of the object to be inspected contacts the downstream end of the inclined surface. When the object to be inspected passes through the inclined surface forming the shielding member, the shielding member separated from the object to be inspected moves downward without changing its position in the conveying direction and returns to its original position. The movement of the shielding member is only in the vertical direction with respect to the movement of the object to be inspected in the conveying direction. The decomposed impact force is smaller than that of the conventional rocking shielding curtain or the like. In addition, since the weight component in the vertical direction is also added, the frictional force acting between the object to be inspected and the conveying means increases, making the object less slippery. Furthermore, the frictional resistance received from the shielding member while the object to be inspected passes through the shielding member is less fluctuating due to the swing angle that changes during passage like the conventional swing-type shielding curtain. never slows down or stops.

According to the X-ray inspection apparatus described in claim 2,
The X-ray shielding means can be configured with a simple mechanism in which the shielding member moves up and down only by pressing the object to be inspected and its own weight. That is, the shielding member is on standby at the lowermost position where it hangs down by its own weight, and when it comes into contact with the conveyed inspected object and is pushed up, it is above the height through which the inspected object can pass. It can move to the position and return to the lower position by its own weight when the object to be inspected passes.

According to the X-ray inspection apparatus described in claim 3,
The shielding member stands by at the lowermost position where it hangs under its own weight, but the shielding member in the lower position is in a state of being urged toward the upper position by the urging means. When such a shielding member comes into contact with the conveyed inspected object and is pushed up, the urging force serves as an auxiliary force for pushing up the shielding member, so the object to be inspected receives a reaction force from the shielding member. is smaller than without the biasing means. Therefore, compared to the case where there is no urging means, the impact force that hinders the conveyance of the inspected object is smaller.

According to the X-ray inspection apparatus described in claim 4,
Since the inclined surface where the shielding member contacts the object to be inspected is a curved surface whose inclination angle continuously changes, the inclination angle of the portion where the object to be inspected comes into contact first changes according to the height of the object to be inspected. It will happen. As a result, the test object is relatively lightweight and has a low height, and the test object can be contacted at a near-horizontal angle, and the impact force in the direction that hinders transportation can be relatively reduced, making it easier to pass through the shielding member smoothly. .

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing seen from the front side which shows the schematic structure of the X-ray inspection apparatus which is 1st Embodiment of this invention typically. 2 is a cross-sectional view seen from the front side showing the configuration of the X-ray shielding means provided in the X-ray inspection apparatus of the first embodiment; FIG. FIG. 4 is a cross-sectional view seen from the front side that continuously shows the action of the X-ray shielding means provided in the X-ray inspection apparatus of the first embodiment when an object to be inspected passes. In the X-ray shielding means provided in the X-ray inspection apparatus of the first embodiment, when two types of inspected objects with different heights collide at different positions of the shielding member, the impact force is distributed depending on the collision position. is a schematic explanatory diagram showing that . It is sectional drawing seen from the front side which shows the structure of the X-ray shielding means provided in the X-ray inspection apparatus of 2nd Embodiment. FIG. 5 is a cross-sectional view seen from the front side showing a modification of the X-ray shielding means provided in the X-ray inspection apparatus of the first embodiment;

A first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.
First, the configuration of an X-ray inspection apparatus 1 of this embodiment will be described with reference to FIG.
As shown in FIG. 1, an X-ray inspection apparatus 1 of the present embodiment includes a housing 2 that shields X-rays, and a housing 2 provided below the housing 2, in which an object W to be inspected is conveyed in a predetermined manner. A conveyer 3 as conveying means for conveying in a direction C (a direction from left to right in FIG. 1); and an X-ray detection means 5 for detecting X-rays that have passed through the object W to be inspected. Although details are not shown, an inlet 6 for the object W to be inspected is provided at the upstream end of the housing 2, and an outlet 7 for the object W to be inspected is provided at the downstream end of the housing 2. The transport conveyor 3 is arranged so that a part of it protrudes from the entrance 6 and the exit 7 of the housing 2 . Although not shown, the conveyer 3 is also covered with a cover for shielding X-rays, and the entire apparatus is installed on the base surface by means of legs (not shown).

Further, although not shown, an input conveyor is provided on the upstream side of the conveyor 3 and configured to supply the inspection object W sent from the upstream to the X-ray inspection apparatus 1 . An unillustrated carry-out conveyor is provided downstream of the carry conveyor 3 to carry out the inspected inspection object W from the X-ray inspection apparatus 1 and send it to the next downstream process (for example, a sorting process). is configured to

As shown in FIG. 1, inside the housing 2, there is an inspection area including a position near the entrance 6, a position near the exit 7, and an X-ray irradiation surface R irradiated from the X-ray irradiation means 4. X-ray shielding means 10 are provided at two positions (total four positions) on both sides of . The X-ray shielding means 10 includes a shielding wall 8 provided in approximately half of the upper wall side, a shielding member 9 provided between the shielding wall 8 and the conveyer 3 so as to be vertically movable, and a shielding member 9 which is vertically movable. It has a support mechanism 11 for movably supporting.

As shown in FIGS. 1 and 2, the shielding wall 8 is a hollow box structure in which two plates parallel to the depth direction and the vertical direction perpendicular to the plane of the drawing are arranged at a predetermined interval. be. The shielding wall 8 has the same width as the housing 2 in the depth direction of FIG. 1, but its dimension in the vertical direction of FIG. 1 is slightly longer than half the height of the housing 2. . The shielding wall 8 is made of the same shielding material as the housing 2 . The shielding wall 8 also functions as a guide member that guides the shielding member 9 vertically.

The shielding member 9 shown in FIGS. 1 and 2 is made of a material having X-ray shielding properties, such as stainless steel, and is set to an appropriate thickness according to the X-ray shielding performance required for the X-ray inspection apparatus 1. , has a predetermined rigidity that does not deform even when pressed by the object W to be inspected. The shielding member 9 is a single plate continuous in the depth direction of FIG. It is arranged in such a posture that the distance from the conveying surface S of the conveyor 3 becomes narrower toward the downstream in the conveying direction C. - 特許庁

As shown in FIG. 2 , a connecting plate 12 that is a part of the support mechanism 11 is fixed to the shielding member 9 on the downstream surface in the transport direction C (upper surface in the vertical direction). The connecting plate 12 is a single plate parallel to the depth direction and the vertical direction in the drawing, and is made of an X-ray shielding material. A roller 13 is rotatably attached to the upper end of the connecting plate 12 . Therefore, the connecting plate 12 and the shielding member 9 can be smoothly moved vertically by the rotation of the rollers 13 . The roller 13 may be a single roller 13 continuous in the axial direction, or may be a plurality of rollers 13 arranged at appropriate intervals. This roller 13 functions as a guide portion for guiding the shielding member 9 in the vertical direction together with the shielding wall 8 described above. match. Therefore, the roller 13 can move up and down within the shielding wall 8 with the connecting plate 12 and the shielding member 9 suspended. The operation of the shielding member 9 will be described later, but the lowest position where the shielding member 9 hangs down due to its own weight is called the lower position (FIG. 2), and the shielding member 9 is pushed up by the object W to be inspected, and the object W to be inspected moves downward. A position that permits passage is referred to as an upper position (FIG. 3(b), which will be described later).

In addition, as shown in FIG. 2, in this embodiment, a slight gap is provided between the lower end of the shielding member 9 located at the lower position and the conveying surface S of the conveyer 3 . Such a gap can be provided by providing a connection plate insertion opening (not shown) functioning as a stopper at the lower end of the shielding wall 8 to prevent the roller 13 from falling downward, and setting the height of the connection plate 12 appropriately. Furthermore, if the opening size of the connecting plate insertion port is appropriately set, it is possible to reliably guide the shielding member 9 only in the vertical direction in cooperation with the rollers 13 . By setting the size of this gap to the extent that there is practically no problem with the leakage of X-rays, and by using other shielding means in combination, it is possible to prevent the transport belt from contacting the transport conveyor 3 and the shielding member 9. Damage can be avoided.

Further, unlike the embodiment shown in FIG. 2, the lower end of the shielding member 9 in the lower position lowered by its own weight may be configured to contact the conveying surface S of the conveyer 3 . In this way, there is no problem with X-ray leakage, and by using other means for avoiding friction, such as using a low-friction material for the contact portion between the conveyor 3 and the shielding member 9, damage to the conveyor belt can be minimized. can be avoided.

As shown in FIG. 2, at the lower end of the shielding wall 8, a substantially L-shaped shielding plate 14 is provided that protrudes while bending downstream in the conveying direction C and vertically downward. The shielding plate 14 is a single plate that is continuous in the depth direction of the figure, and its lower end is located slightly below the upper end of the shielding member 9 at the lower position, and is between the shielding wall 8 and the shielding member 9. is shielding the However, in this embodiment, since the space between the shielding wall 8 and the shielding member 9 is shielded by the single connecting plate 12, it is not always necessary to add the shielding plate 14. By providing it, the shielding performance is further enhanced. Alternatively, on the assumption that the shielding plate 14 is provided, the connecting plate 12 may be a simple structure in which a plurality of connecting rods arranged at predetermined intervals are used instead of a single plate.

Next, the operation of the X-ray inspection apparatus 1 of this embodiment will be described with reference to FIGS. 1 and 3. FIG.
An outline of an inspection process of an object W to be inspected in the X-ray inspection apparatus 1 will be described with reference to FIG. An object to be inspected W (not shown in FIG. 1) is sent to the transport conveyor 3 by an upstream transport conveyor (not shown). The object W to be inspected is conveyed inside the housing 2 by the conveyer 3 while slipping through the X-ray shielding means 10 . After passing through the second X-ray shielding means 10 counted from upstream, the object W to be inspected enters an inspection area having an irradiation surface R and is irradiated with X-rays from the X-ray irradiation means 4 . At this time, since the shielding members 9 of the two X-ray shielding means 10 located upstream and downstream of the examination area are positioned downward, the examination area is shielded within the housing 2 with the desired shielding performance. The X-rays transmitted through the object W to be inspected are detected by the X-ray detection means 5, and the object W to be inspected is inspected according to the detection result. The inspected object W that has undergone inspection passes through the X-ray shielding means 10 downstream of the inspection area and the X-ray shielding means 10 close to the exit 7 in order, and leaves the housing 2 . After that, the inspected objects W to be inspected are sent to the downstream next process (for example, the sorting process) by the unillustrated carry-out conveyer 3 . In this embodiment, two X-ray shielding means 10 are provided on the upstream side and the downstream side of the inspection area. It may be increased or decreased appropriately according to the characteristics of the line.

In the inspection process of the X-ray inspection apparatus 1 described above, the action when the inspection object W passes through the X-ray shielding means 10 will be described in more detail with reference to FIG.
FIG. 3( a ) shows the state before the transported inspection object W collides with the curved surface forming the shielding member 9 . The shielding member 9 hangs down by its own weight and is in the lowest downward position.

FIG. 3(b) shows a state in which the inspected object W that has been conveyed collides with the curved surface forming the shielding member 9 and is pushed up to be set to the upper position. When the object to be inspected W transported to the transport conveyor 3 contacts the curved surface forming the shielding member 9 , the shielding member 9 pushed by the object to be inspected W is guided by the rollers 13 to the shielding wall 8 , so that the shielding member 9 is transported. Move smoothly upwards without changing the position of the direction. The friction between the inspected object W and the curved surface of the shielding member 9 is small, and the inspected object W can pass through the shielding member 9 without receiving a large resistance.

FIG. 3(c) shows a state in which the inspected object W has passed through the curved surface forming the shielding member 9 and the shielding member 9 has returned to the lower position. When the object to be inspected W passes through the shielding member 9, the shielding member 9 separated from the object to be inspected W is not pushed up by the object to be inspected W, and the rollers 13 are guided by the shield wall 8. It moves downward by its own weight without changing its position in the conveying direction and returns to its original downward position.

In this way, the movement of the shielding member 9 is only in the vertical up-down direction with respect to the movement of the inspection object W in the conveying direction C, and the inspection object W forms the curved surface of the shielding member 9 while passing through the shielding member 9. The frictional resistance received from the inspection object W is smaller than that of the conventional oscillating shielding curtain or the like, and the inspection object W does not decelerate or stop.

FIG. 4 shows, in the X-ray shielding means 10 provided in the X-ray inspection apparatus 1 of the first embodiment, two types of inspected objects W having different heights are applied at different positions on the curved surface forming the shielding member 9, and the impact force FIG. 10 is a schematic explanatory diagram showing that, when colliding at F1 and F2, the distribution of the impact force differs depending on the colliding position. The relatively high impact force of the inspection object is F1, and the relatively low impact force of the inspection object W is F2.

According to this X-ray shielding means 10, since the surface of the shielding member 9 that contacts the object W is a convex curved surface, the impact forces F1 and F2 applied from the shielding member 9 to the object W are It is decomposed into components F1H and F2H parallel to C and vertical components F1V and F2V orthogonal thereto. Therefore, the impact forces F1H and F2H in the conveying direction C that hinder the conveying of the object W to be inspected are smaller than in the case of the conventional rocking shielding curtain or the like. In addition, of the impact force, since the components F1V and F2V in the vertical direction orthogonal to the conveying direction are added to the own weight, the frictional force acting between the conveying surface S of the conveyer 3 and the object to be inspected W increases. The object W becomes less slippery on the conveyer 3, and any object W to be inspected easily slips through the shielding member 9. - 特許庁

In FIG. 4, the impact force F1 is the impact force when a relatively tall object to be inspected collides with the shielding member 9, and the impact force F2 is the impact force when the relatively small object to be inspected collides with the shielding member 9. This is the impact force when the member 9 collides. A relatively tall object to be inspected generally has a correspondingly large weight, so the frictional force acting between it and the conveyer 3 is also large, and the component F1V in the vertical direction by the shielding member 9 is smaller than the component F1H in the conveying direction C. However, there is no problem because the frictional force increases accordingly. In addition, since relatively low inspection objects generally have a correspondingly small weight, the frictional force acting between them and the conveyer 3 is correspondingly small. is greater than the component F2H of , which increases the frictional force, so there is no problem.

The X-ray shielding means 20 provided in the X-ray inspection apparatus 1 of the second embodiment will be described with reference to FIG. Parts similar to those of the first embodiment are assigned the same reference numerals as those of the first embodiment, and the description of the first embodiment is used.
As shown in FIG. 5A, according to the X-ray shielding means 20 of the second embodiment, the horizontal first support plate 21 is fixed to the upper end of the connecting plate 12 . The first support plate 21 is a member that functions as a guide portion for guiding the shielding member 9 in the vertical direction like the roller 13 described above, and can slide vertically inside the shielding wall 8 . A second support plate 22 is fixed at a predetermined upper position inside the shielding wall 8 . A spring 23 as a biasing means is provided between the first support plate 21 and the second support plate 22 in the cavity inside the shielding wall 8 . A stopper 24 projecting inward is provided at a predetermined position below the first support plate 21 in the cavity of the shielding wall 8 . When the integrated shielding member 9, connecting plate 12 and first support plate 21 are lowered by their own weight, the spring 23 is elastically extended from its original length, and the first support plate 21 is engaged with the stopper 24. Then, the shielding member 9 and the like stop. At this time, a minute gap is generated between the shielding member 9 and the conveying surface S of the conveyer 3 . This position is the lower position of the shielding member 9 . Thus, the shielding member 9 in the lower position shown in FIG. 5(a) is in a state of being biased toward the upper position by the restoring force of the extended spring 23. As shown in FIG.

When the upwardly biased shielding member 9 shown in FIG. 5(a) is pushed up by the conveyed inspection object W as shown in FIG. 5(b), the biasing force is applied to the shielding member. It becomes an auxiliary force that pushes up 9. Therefore, the reaction force that the inspection object W receives from the shielding member 9 is smaller than when the spring 23 is not provided. Therefore, compared with the case without the spring 23, the impact force that hinders the transport of the object W to be inspected is smaller. Therefore, the frictional resistance that the inspected object W receives from the shielding member 9 while passing through the shielding member 9 becomes even smaller than in the first embodiment, and the effect of suppressing deceleration and stopping of the inspected object W further increases. Conveyance is more stable. In addition, when the shielding member 9 is moved from the upper position to the lower position, the restoring force of the spring 23 can soften the impact when the shielding member 9 is dropped.

Modified examples of the X-ray shielding means 10 of the first embodiment shown in FIGS. (10b to 10d) will be explained. Parts of the modified example that are the same as in the first embodiment are denoted by the same reference numerals as in the first embodiment, and the description of the first embodiment is used.
In the X-ray shielding means 10b shown in FIG. 6B (inclined plane type), the shielding member 9b is composed of a flat plate, and the distance between the surface that collides with the object to be inspected W and the conveying surface S of the conveyer 3 is the conveying direction C It is arranged so that it becomes narrower toward the According to this modification, there is no need to prepare curved plates as in the first embodiment shown in FIG. 6A, and substantially the same effects as those of the first embodiment can be obtained at a low manufacturing cost. However, unlike the example shown in FIG. 4, the ratio of breaking down the impact force into the horizontal direction and the vertical direction is the same regardless of whether the vehicle collides at a high position or at a low position.

The X-ray shielding means 10c shown in FIG. 6(c) (two-stage inclined plane type) has a shielding member 9c formed of a flat plate, which is bent upward to form a steep inclined surface and a gentle inclined surface. As a result, the gap between the surface that collides with the object to be inspected W and the conveying surface S of the conveyer 3 sharply narrows on the upstream side in the conveying direction C, and narrows somewhat slowly on the downstream side. is. According to this modification, there is no need to prepare a metal plate such as stainless steel having a curved surface as in the first embodiment shown in FIG. can be obtained. Also, substantially the same effect as the example shown in FIG. 4 can be obtained. Furthermore, the size of the shielding plate 14 in the vertical direction can be made smaller than in any of the embodiments.

FIG. 6(d) (curved surface + shielding member 9 rotation mechanism) is such that the connecting portion of the shielding member 9 and the connecting plate 12 of the first embodiment shown in FIG. It is made possible to swing by The shaft member 25 is arranged at a position such that the downstream side is lowered to the lowest position when the shielding member 9 is in a hanging state due to its own weight. According to this modification, substantially the same effects as those of the first embodiment shown in FIG. 6(a) can be obtained. Therefore, the frictional resistance that the inspection object W receives from the shielding member 9 while passing through the shielding member 9 becomes even smaller than in the first embodiment, and the effect of suppressing the deceleration and stopping of the inspection object W is further enhanced. becomes more stable.

The modified examples (10b to 10d) of the X-ray shielding means 10 of the first embodiment shown in FIGS. 6(b) to (d) may be applied to the second embodiment shown in FIG.

DESCRIPTION OF SYMBOLS 1... X-ray inspection apparatus 2... Case 3... Conveyor as a conveying means 4... X-ray irradiation means 5... X-ray detection means 6... Entrance 7... Exit 8... Shield plate as a guide part 9, 9b, 9c... Shield member 10, 10b, 10c, 10d... X-ray shielding means 11... Support mechanism 13... Roller as guide part 21... First support plate as guide part 23... Spring as urging means W... Object to be inspected C... Conveying direction S: Conveying surface

Claims (4)

A housing (2) having a shielding structure provided with an entrance (6) and an exit (7) for an object (W) to be inspected;
a conveying means (3) for conveying an object to be inspected along the conveying direction (C) inside the housing;
X-ray irradiating means (4) for irradiating X-rays onto the inspected object conveyed in the housing by the conveying means;
X-ray detection means (5) for detecting X-rays transmitted through an object to be inspected;
An X-ray inspection apparatus (1) comprising
An inclined surface is provided above the conveying means in the housing and is inclined so that a distance from the conveying means becomes narrower in the conveying direction, and the inclined surface contacts the inspected object being conveyed. a shielding member (9, 9b, 9c) which moves upward by the movement of the shielding member (9, 9b, 9c) and moves downward when the inclined surface separates from the object to be inspected;
including a shielding wall (8) provided on the upper wall of the housing, made of an X-ray shielding material, and vertically movably supporting the shielding member between the shielding wall and the conveying means ; a support mechanism (11) that allows upward and downward movement by the conveyed inspected object;
X-ray examination apparatus (1), characterized in that it comprises X-ray shielding means (10, 10b, 10c, 10d) comprising: The support mechanism (11) is
A lower position where the shielding member (9, 9b, 9c) hangs down by its own weight, and an upper position where the shielding member is pushed up by the object to be inspected (W) to allow passage of the object to be inspected. 2. An X-ray inspection apparatus (1) according to claim 1, further comprising guides (8, 13) for guiding said shielding member so that it can move up and down between them. The support mechanism (11) is
between a lower position where the shielding members (9, 9b, 9c) hang down by their own weight and an upper position where the shielding members are pushed up by the object to be inspected and allow passage of the object to be inspected. , a guide portion (8, 21) for vertically movably guiding the shielding member;
urging means (23) provided in the guide portion for urging the shielding member in the lower position toward the upper position;
X-ray examination apparatus (1) according to claim 1, characterized in that it comprises: An X-ray inspection apparatus (1) according to any one of claims 1 to 3, characterized in that said shielding member (9) has a curved surface on said inclined surface that contacts the object (W) to be inspected.

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