JP7199996B2 - X-ray inspection device - Google Patents

Description

The present invention relates to an X-ray inspection apparatus for inspecting, with X-rays, an object to be inspected transported within an inspection area surrounded by a housing. An X-ray inspection apparatus having a shielding curtain provided on an object conveying path is characterized in that an object to be inspected passing through while pushing up the shielding curtain is prevented from being damaged by contact with the shielding curtain.

Patent Literature 1 listed below discloses an invention of an X-ray foreign matter detection apparatus in which a shielding curtain is provided on a transport path of an object to be inspected. In the X-ray foreign matter detection apparatus of the present invention, a plurality of shielding curtains are provided along the conveyor belt of the conveyor section provided within the inspection area to block X-rays generated by the X-ray generator from the housing. Prevents leaks. The shielding curtain has a sliding sheet with a small coefficient of friction superimposed on the front side in the conveying direction. The object to be inspected is transported by the transport belt and moved, and when passing through the shielding curtain, it can pass by pushing up the shielding curtain while sliding in contact with the slide sheet. Therefore, the object to be inspected can be transported and inspected in a stable state without being caught by the shielding curtain and stopped or reversed.

Japanese Patent Application Laid-Open No. 2002-228601

There is a packaging method called shrink packaging in which a product is wrapped in a heat-shrinkable plastic film and the film is shrunk into the shape of the product by a heating device. This shrink packaging is used for packaging many kinds of products such as paper-packed alcoholic beverages and instant noodles. Once shrink-wrapped, there is little possibility of foreign matter entering the package, and once the subsequent X-ray inspection is complete, all that is left to do is to ship the product. often. However, since the film immediately after being thermally shrunk is still soft and has a large coefficient of friction, the film may be damaged when passing through an X-ray inspection device.

As an X-ray inspection apparatus for inspecting foreign matter contamination, etc., an object to be inspected is carried into an inspection area shielded by a housing by means of a conveying means while being inspected by X-rays. There is a type that is carried out outside the inspection area. In such an X-ray inspection apparatus, a shielding curtain may be provided at the entrance or the like of the object to be inspected provided in the housing. The X-ray foreign object detection apparatus of Patent Document 1 is also of the same type. In an X-ray inspection apparatus having such a shielding curtain, an object to be inspected moves while pushing aside the shielding curtain, and thus receives considerable external force due to contact with the shielding curtain when passing through.

Therefore, if an X-ray inspection apparatus provided with such a shielding curtain is installed immediately after the packaging process by shrink wrapping, the product with a soft film due to heat immediately after shrinking will be carried into the X-ray inspection apparatus. become. When such a product passes through the shielding curtain, contact with the shielding curtain may cause the film of the product to be damaged or cut.

In addition, even if it is not shrink-wrapped, for example, in the case of a soft packaging bag such as polypropylene for wrapping bread, when it passes through the shielding curtain in the X-ray inspection device as described above, the packaging bag may come into contact with the shielding curtain. In some cases, the printed characters and patterns on the packaging bag are deformed and the commercial value is lost. In addition, when the packaging bag is pulled by contact with the shielding curtain, the orientation and posture of the product placed on the conveying means change, and the product no longer conforms to the inspection direction (X-ray irradiation direction) of the X-ray inspection device. Sometimes I was exhausted. Furthermore, in the case where the sorting process is arranged downstream of the X-ray inspection device, if the direction or posture of the product changes from the predetermined state by the X-ray inspection device, it will not be suitable for mechanical sorting. In some cases, the sorting work was hindered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional techniques and problems thereof. It is an object of the present invention to provide an X-ray inspection apparatus which is small in size and less likely to damage merchandise or packaging.

The X-ray inspection apparatus 1 according to claim 1,
a housing 2 that shields X-rays;
a conveying means 3 for conveying the packaged inspection objects W, W1, W2 in a predetermined conveying direction C within the inspection area P surrounded by the housing;
an X-ray irradiation unit 4 for irradiating the inspected objects W, W1, W2 conveyed by the conveying means 3 with X-rays;
an X-ray detection unit 5 that detects X-rays that have passed through the objects W, W1, and W2 to be inspected;
In an X-ray inspection apparatus 1 that inspects the objects W, W1, and W2 to be inspected according to the detection result of the X-ray detection unit 5,
a support shaft 11 provided above the conveying means 3 in the inspection region P and extending in a horizontal direction orthogonal to the conveying direction C;
a shielding curtain 10 which is attached to the support shaft 11, is swingable toward the downstream side in the conveying direction C from the vertical direction , has rigidity, and shields the X-rays ;
It has a roller shaft 16 parallel to the support shaft 11 and is provided at least at the lower end of the upstream surface of the shielding curtain 10, and rolls while contacting the packaging of the inspection object when the inspection object passes through. Cylindrical rollers 15, 15a for swinging the shielding curtain with
have.

The X-ray inspection apparatus 1 according to claim 2 is the X-ray inspection apparatus 1 according to claim 1,
A plurality of rollers 15a are attached to the roller shaft 16 in such a manner that the rollers 15 contact the packages of the objects W, W1, and W2 to be inspected .

The X-ray inspection apparatus 1 according to claim 3 is the X-ray inspection apparatus 1 according to claim 1 or 2,
A plurality of roller shafts 16 are provided at the lower end of the shielding curtain 10 and at a position above the lower end at a height approximately equal to the object to be inspected .

The X-ray inspection apparatus 1 according to claim 4 is the X-ray inspection apparatus 1 according to any one of claims 1 to 3,
The roller 15a of the roller shaft 16 at the lower end of the shielding curtain 10 is made of resin. It is

According to the X-ray inspection apparatus of claim 1, the object to be inspected is transported by the transport means and is irradiated with X-rays from the X-ray irradiation unit within the housing. The X-rays transmitted through the object to be inspected are detected by the X-ray detector, and the object to be inspected is inspected according to the detection result. In such an inspection, when an object to be inspected being conveyed by a conveying means pushes the shielding curtain, the pushed shielding curtain is lifted with its lower end swinging downstream about the support shaft. can travel downstream past the bottom edge of the shielding curtain. At this time, a roller is provided at the lower end of the upstream surface of the shielding curtain with which the object to be inspected contacts, and this roller is supported by a roller shaft and smoothly rolls along the surface of the object to be inspected. The self-weight of the shielding curtain and rollers is applied to the inspected object, but the smooth rotation of the rollers reduces the frictional force acting on the package, allowing the inspected object to slip through the shielding curtain smoothly and easily. Therefore, there is little possibility that the packaging of the inspected object will be damaged. Further, when the object to be inspected passes through the shielding curtain and leaves the roller, the shielding curtain swings upstream around the support shaft by its own weight, and can return to a position where its surface is aligned with the vertical direction. The shielding function of the shielding curtain is restored immediately.

According to the X-ray inspection apparatus described in claim 2 or claim 3, the rollers are provided at different positions on the shielding curtain. As an example, if a plurality of small rollers are provided at different positions in the extending direction of the roller shaft provided at the lower end of the shielding curtain, the weight of the rollers can be reduced, and the object to be inspected can be moved in the width direction of the conveying means. With a much smaller size, less frictional force can be exerted while maintaining the width of the roller in contact with the object to be inspected. As another example, if a plurality of roller shafts are provided at different positions in the vertical direction of the shielding curtain, even if the object to be inspected is relatively tall, the object can pass through the shielding curtain. In practice, a plurality of rollers rolls in contact with the surface in order according to the outer shape of the object to be inspected, and separates from the surface in sequence. The frictional force between the object to be inspected and the roller therebetween is small, and even a tall object to be inspected can smoothly and easily pass through the shielding curtain as compared to a small object to be inspected. At this time, it is more preferable to lighten the weight by providing a plurality of small rollers at different positions in the extending direction of each roller shaft.

According to the X-ray inspection apparatus described in claim 4, since the downstream side in the conveying direction of the roller provided at the lower end of the shielding curtain is covered with the cover portion, the roller is made of lightweight resin that rotates smoothly. However, it is possible to prevent the X-rays transmitted through the roller from leaking out of the inspection area.

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. FIG. 4A is a front view, and FIG. It is a plan view. FIG. 10 is a front view continuously showing the operation of the shielding curtain provided in the X-ray inspection apparatus of the first embodiment when an object to be inspected having a relatively small height passes through; FIG. 10A is a front view showing the configuration of a shielding curtain or the like provided in the X-ray inspection apparatus of the second embodiment, and FIG. It is a plan view. FIG. 10 is a front view continuously showing the action of the shielding curtain provided in the X-ray inspection apparatus of the second embodiment when an object to be inspected having a relatively large height passes through; It is a figure showing the structure of the shielding curtain etc. which were provided in the X-ray inspection apparatus of 3rd Embodiment, and a part figure (a) is a front view, and a part figure (b) is the left side seen from the upstream of the conveyance direction C. It is a plan view.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.
First, the configuration of an X-ray inspection apparatus 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG.
As shown in FIG. 1, the X-ray inspection apparatus 1 of the present embodiment includes a housing 2 that shields X-rays, and an object to be inspected within an inspection area P that is provided under the housing 2 and surrounded by the housing 2. A conveyer 3 serving as conveying means for conveying W (W1, W2) in a predetermined conveying direction C (a direction from left to right in FIG. 1), and X-rays are applied to the inspected object W conveyed by the conveyer 3. It has an X-ray irradiation unit 4 for irradiation and an X-ray detection unit 5 for detecting X-rays transmitted 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 thereof protrudes from the entrance 6 and the exit 7 of the housing 2 , and an inspection area P is formed between the entrance 6 and the exit 7 . Although not shown, the conveyor 3 is also covered with a shielding cover except for the entrance 6 and the exit 7, and the entire apparatus is placed on the base surface by 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 . Further, an unloading conveyor is provided downstream of the transport conveyor 3, and configured to carry out the inspected inspection object W from the X-ray inspection apparatus 1 and send it to the next process (for example, sorting process) on the downstream side. It is

As shown in FIGS. 1 and 2, the inside of the inspection area P surrounded by the housing 2 includes positions near the entrance 6, positions near the exit 7, and irradiation from the X-ray irradiation unit 4. Shielding walls 8 are provided on the upper surface of the housing 2 at two positions (four positions in total) on both sides of the examination area including the X-ray irradiation surface R. As shown in FIG. The shielding wall 8 is made of the same shielding material as the housing 2, and has the same width as the housing 2 in the direction perpendicular to the paper surface of FIG. It has half height.

As shown in FIGS. 1 and 2, shielding curtains 10 are attached to the lower ends of the four shielding walls 8, respectively. The shielding curtain 10 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 of the X-ray inspection apparatus 1 . The shielding curtain 10 is a single plate material having a predetermined rigidity that does not deform even when pressed by the object W to be inspected. Rectangles of equal size. In addition, in FIG. 2(b), shielding protrusions 20 protruding inward are formed on the inner walls on the right and left sides of the housing 2 that houses the shielding curtain 10. There is no harmful gap with the edge that could leak X-rays. As described above, the structure for shielding the gap between the housing 2 and the shielding curtain 10 may be formed by integrally forming a partial protrusion such as the shielding projection 20 on the inner wall of the housing 2, or by forming a flat surface. It may be provided by retrofitting a shielding member of a required size to the inner wall of the housing 2 .

As shown in FIGS. 1 and 2, the upper end of the shielding curtain 10 is supported by a support shaft 11 extending in a horizontal direction perpendicular to the conveying direction C (perpendicular to the paper surface of FIGS. 1 and 2A). It is attached to the lower end of the shielding wall 8 so as to be swingable. Further, as shown in FIG. 2( a ), a stopper member 12 is provided at the lower end of the shielding wall 8 at a position on the upstream side of the support shaft 11 so as to protrude downward. The stopper member 12 abuts on the upstream surface (hereinafter referred to as the front surface) of the shielding curtain 10 when the shielding curtain 10 hangs down by its own weight and is parallel to the vertical direction. Therefore, the shielding curtain 10 cannot swing toward the upstream side in the conveying direction C from the vertical direction. That is, the shielding curtain 10 is allowed to swing only toward the downstream side in the conveying direction C from the vertical direction.

As shown in FIGS. 1 and 2 , a roller 15 is provided at the lower end of the upstream surface of the shielding curtain 10 by a roller shaft 16 parallel to the support shaft 11 . Therefore, as can be seen from FIG. 2A, the roller 15 protrudes upstream in the conveying direction C from the front surface (the left surface in the drawing) of the shielding curtain 10 . Also, the half of the roller 15 below the roller shaft 16 protrudes below the lower end of the shielding curtain 10 . The roller 15 faces the conveying surface S of the conveyer 3 with a small gap therebetween, but since it is rotatable, it may be in contact with it. As described above, there may be a minute gap between the roller 15 and the conveying surface S, or they may be in contact with each other. It works well and is easy to work with. There is a gap between the lower end of the shielding curtain 10 and the conveying surface S, but this part is covered by half of the roller 15 as described above. It is preferably made of shielding material, for example metal.

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 inspection process of an object W to be inspected in the X-ray inspection apparatus 1 shown in FIG. 1 will be described. The object to be inspected W is sent to the transport conveyor 3 by an upstream carrying-in transport conveyor (not shown). The object W to be inspected is conveyed by the conveyer 3 in the inspection area P surrounded by the housing 2 while slipping through the shielding curtain 10 . After passing through the second shielding curtain 10 counted from the upstream side, the object W to be inspected enters the central portion of the inspection region P and is irradiated with X-rays from the X-ray irradiation unit 4 . At this time, since the shielding curtains 10, 10 on the upstream side and the downstream side of the inspection area P are stationary in the vertical direction, the inspection area P is shielded from the outside of the housing 2. FIG. The X-rays transmitted through the object W to be inspected are detected by the X-ray detector 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 shielding curtain 10 on the downstream side of the inspection area and the shielding curtain 10 near 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, sorting process) by an unillustrated carry-out conveyer.

In the above-described inspection process of the X-ray inspection apparatus 1, the action when the object W to be inspected passes through the shielding curtain 10 will be described with reference to FIG. As described above, the shielding curtain 10 of this embodiment is provided with one roller 15 at the lower end of the upstream surface, and as described below, compared to the second embodiment described later, it is relatively A small (low) object to be inspected W1 is targeted.

As shown in FIG. 3(a), the shielding curtain 10 hangs down by its own weight and is in a position (waiting position) in which the posture is parallel to the vertical direction. coming closer. The height of this inspected object W1 is about the same as the lower end of the shielding curtain 10 at the standby position or the height of the roller shaft 16 supporting the roller 15 at the standby position.

As shown in FIG. 3(b), when the front end of the transported object W1 hits the roller 15, the shielding curtain 10 and the roller 15 which have been pushed are swung downstream around the support shaft 11 and lifted. .

As shown in FIG. 3C, as the object W1 to be inspected is transported, the roller 15 rolls along the object W1 to be inspected and rides on its upper surface. The object W1 to be inspected can pass under the lower end of the shielding curtain 10 while contacting the roller 15 and move downstream.

As shown in FIG. 3(d), when the object W1 to be inspected is further conveyed and the roller 15 separates from the object W1 to be inspected, the roller 15 and the shielding curtain 10 are swung upstream by their own weight, and the stopper member 12 is moved. It abuts and stops, and returns to the standby position shown in FIG. 3(a).

As described above with reference to FIGS. 3(a) to 3(d), when the roller 15 rolls along the surface of the object W1 to be inspected, the roller 15 is supported by the roller shaft 16 and rotates smoothly. Moreover, since the frictional resistance acting between the object W1 and the roller 15 is small, even if the weight of the shielding curtain 10, the roller 15 and the roller shaft 16 acts on the contact surface of the roller 15 against the object W1, the object can be conveyed. Only a slight frictional force directed obliquely backward with respect to the direction is generated, and the inspected object W1 can pass through the shielding curtain 10 smoothly and easily. Therefore, there is little possibility that the object W1 to be inspected or its packaging will be damaged. When the object W1 to be inspected passes through the shielding curtain 10 and leaves the rollers 15, the shielding curtain 10 swings toward the upstream centering on the support shaft 11 by its own weight, and the surface of the shielding curtain 10 coincides with the vertical direction at the waiting position. , and the shielding function of the shielding curtain 10 is immediately recovered.

Next, the shielding curtain 10 of the second embodiment will be described with reference to FIGS. 4 and 5. FIG.
First, the configuration of the shielding curtain 10 will be described with reference to FIG.
As described below, the shielding curtain 10 of the second embodiment is intended for an object W2 to be inspected that is relatively taller (higher) than the first embodiment described above. In addition, in the description of the second embodiment, as a general rule, the description of the first embodiment is used and the description of the same components as those of the first embodiment is omitted. 4 and 5 that are the same as those in FIG. 2 are denoted by the same reference numerals as in FIG.

As shown in FIG. 4, in the X-ray inspection apparatus of the second embodiment, two rollers 15, 15 are arranged in parallel with each other with roller shafts 16, 16 at two positions aligned in the vertical direction of the shielding curtain 10. installed. These rollers 15 protrude upstream in the transport direction C from the front surface of the shielding curtain 10 . Also, the lower half of the roller 15 protrudes below the lower end of the shielding curtain 10 .

Next, the action when the inspection object W2 passes through the shielding curtain 10 will be described with reference to FIG.
As shown in FIG. 5(a), the shielding curtain 10 hangs down by its own weight and is in a position (waiting position) in which the posture is parallel to the vertical direction. coming closer. The height of this inspected object W2 is approximately the same as the height of the roller shaft 16 that supports the upper roller 15 at the standby position.

As shown in FIG. 5(b), when the front surface of the transported object W2 hits the two rollers 15, 15, the pushed shielding curtain 10 and the rollers 15, 15 are directed downstream about the support shaft 11. After that, the lower roller 15 separates from the object W2 to be inspected, and the upper roller 15 contacts the vicinity of the upper end of the front surface of the object W2 to roll.

As shown in FIG. 5C, when the upper roller 15 rolls along the inspected object W2 and rides on the upper surface of the inspected object W2 as the inspected object W2 is conveyed, the lower roller 15 that has been separated from the inspected object W2 is pushed onto the upper surface. Since it comes into contact with the inspection object W2, the inspection object W2 can pass under the lower end of the shielding curtain 10 and move downstream.

As shown in FIG. 5D, when the object W2 to be inspected is further conveyed and the upper roller 15 separates from the object W2 to be inspected, the lower roller 15 contacts the upper surface of the object W2 to roll. Then, the object W2 to be inspected can pass under the lower end of the shielding curtain 10 and move further downstream. Further, when the object W2 to be inspected is conveyed and the lower roller 15 separates from the object W2 to be inspected, the rollers 15, 15 and the shielding curtain 10 swing upstream due to their own weight and come into contact with the stopper member 12 to stop. , to the standby position shown in FIG. 5(a).

As described above with reference to FIGS. 5(a) to 5(d), when the comparatively tall inspection object W2 passes through the shielding curtain 10 of the present embodiment, it is arranged vertically in parallel. The two horizontal rollers 15, 15 roll in contact with the surface of the object W2 to be inspected in order according to the outer shape of the object W2, and gradually separate from the surface. The frictional resistance between the object to be inspected W2 and the rollers 15, 15 between them is small. On the other hand, only a slight frictional force directed obliquely backward is generated, and the smoothness and easiness of the operation of slipping through the shielding curtain 10 even for the tall inspected object W2 is the same as that for the short inspected object W1. Absent. Therefore, the object W2 to be inspected can slip through the shielding curtain 10 smoothly and easily, so that the possibility of damaging the object W2 or its packaging is small. In addition, it is less likely that the tall object W2 to be inspected falls over due to the force received from the roller 15, or that its posture changes. Furthermore, when the object W2 to be inspected passes through the shielding curtain 10 and leaves the rollers 15, the shielding curtain 10 swings toward the upstream around the support shaft 11 by its own weight, and the surface of the shielding curtain 10 stands by in line with the vertical direction. It can quickly return to the position, and the shielding function of the shielding curtain 10 is restored immediately.

In the second embodiment, the shielding rollers 15 are arranged in two stages vertically. roller 15 may be provided.

Next, the shielding curtain 10 of the third embodiment will be described with reference to FIG.
In the following description, as a general rule, the description of the first embodiment will be used for the same components as those of the first embodiment, and the description will be omitted. In addition, the same components as in FIG. 2 shown in FIG. 6 are given the same symbols as in FIG.

As shown in FIG. 6, in the X-ray inspection apparatus of the second embodiment, a roller 15a is provided at the lower end of the upstream surface of the shielding curtain 10 by a roller shaft 16 parallel to the support shaft 11. As shown in FIG. The roller 15a is divided into a plurality of rollers (four small rollers 15a, . is attached to the roller shaft 16. These rollers 15a may be made of resin. In this case, since they are lighter than metal rollers, they tend to roll when in contact with the conveyed object W to be inspected. Smaller than metal rollers. However, the resin roller 15a has no X-ray shielding ability. Therefore, in this embodiment, a cover portion 17 is provided at the lower end of the shielding curtain 10 to cover the downstream side of the roller 15a in the conveying direction and shield the X-rays transmitted through the roller 15a from leaking out of the inspection area P. The cover part 17 is integrally formed by extending the shielding curtain 10 downward, and is in contact with the conveying surface S of the conveyer 3 with a small gap. The amount of X-rays leaking out can be greatly reduced.

Since the plurality of rollers 15a in the third embodiment are made of resin, the cover portion 17 is provided over the entire width of the shielding curtain 10. However, if the rollers 15a are made of metal and have shielding capability, the rollers 15a and the rollers A comb-shaped cover portion may be provided to cover only the portion between 15a.

Further, although the rollers 15 and 15a in each of the embodiments described above have a right cylindrical shape, both ends of the circular peripheral surface may be chamfered or curved. As a result, when the rollers 15 and 15a contact the objects W1 and W2, the objects W1 and W2 or their packages are less likely to be damaged.

DESCRIPTION OF SYMBOLS 1... X-ray inspection apparatus 2... Case 3... Conveyor as a conveying means 4... X-ray irradiation part 5... X-ray detection part 10... Shielding curtain 11... Support shaft 15... Roller 15a... Small roller 16... Roller axis 17 ... Cover part 20 ... Shielding protrusion W, W1, W2 ... Object to be inspected C ... Conveying direction S ... Conveying surface P ... Inspection area

Claims (4)

A housing (2) that shields X-rays;
a conveying means (3) for conveying the packaged inspection objects (W, W1, W2) in a predetermined conveying direction (C) within the inspection area (P) surrounded by the housing;
an X-ray irradiator (4) for irradiating X-rays onto the inspected object conveyed by the conveying means;
an X-ray detection unit (5) that detects X-rays that have passed through the object to be inspected;
In an X-ray inspection apparatus that inspects the object to be inspected according to the detection result of the X-ray detection unit,
a support shaft (11) provided above the conveying means in the inspection area and extending in a horizontal direction orthogonal to the conveying direction;
a shielding curtain (10) attached to the support shaft, swingable toward the downstream side in the conveying direction from the vertical direction , and having rigidity and shielding the X-rays ;
It has a roller shaft (16) parallel to the support shaft, is provided at least at the lower end of the upstream surface of the shielding curtain, and rolls while contacting the package of the inspection object when the inspection object passes through. a cylindrical roller (15, 15a) for rocking said shielding curtain with
An X-ray inspection apparatus (1) comprising: 2. The X-ray according to claim 1 , wherein the roller (15) contacting the packaging of the object to be inspected is divided into a plurality of rollers ( 15a) and attached to the roller shaft (16). Inspection device (1). 3. The X according to claim 1 or 2, wherein the plurality of roller shafts (16) are provided at the lower end of the shielding curtain (10) and at a position above the lower end and approximately the same height as the object to be inspected. Line inspection device (1). The roller (15a) of the roller shaft (16) at the lower end of the shielding curtain is made of resin , and a cover portion that covers the downstream side of the resinous roller in the conveying direction and shields the X-rays. An X-ray inspection apparatus (1) according to any one of claims 1 to 3, further comprising (17).

Images