JP2002228601A - X-ray foreign matter detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an object to be inspected stably conveyable while preventing the leak of X-rays. SOLUTION: A plurality of shielding curtains 15 are provided along the conveyer belt 10 of a conveying part to prevent the leak of X-rays generated in an X-ray generation part 1 to the outside. A slip sheet 16 low in the coefficient of friction is provided to each of the shielding curtains 15 on the front side of the feeding direction in a superposed state. The object W to be inspected is conveyed and moved along a conveyer belt 10 and comes into contact with the slip sheet 16 at the time of passage through each of the shielding curtains 15 and pushes up each of the shielding curtains 15 to pass. By this constitution, the object W to be inspected can be conveyed in a stable state without being caught to stop or reverse.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray foreign matter detection apparatus for detecting foreign matter inside a specimen while conveying the same, and more particularly, to stabilizing the conveyance of the specimen while preventing leakage of X-rays. X-ray foreign matter detector.

[0002]

2. Description of the Related Art FIG. 5 is a front view showing the structure of an X-ray foreign matter detector. The X-ray foreign matter detection device 50 arranges a conveyor 51 for transporting the inspection object at the center, irradiates the inspection object with X-rays from the X-ray generation unit 52, and converts the X-rays transmitted through the inspection object into X-rays. Foreign matter in the inspection object detected by the detection unit 53 (for example,
Metal, bone, wood, synthetic resin, etc.). The X-ray foreign matter detector 50 includes a conveyor 51 so that the X-rays emitted from the X-ray generator 52 do not leak outside.
Is provided with a cover 55 formed of a metal material for X-ray shielding covering the entire length.

[0003] Most of the X-rays emitted from above by the X-ray foreign matter detection device 50 pass through the inspection object and reach the X-ray detection unit 53. However, some X-rays are reflected by the object to be inspected and reflected in the direction indicated by the arrow in the figure, and some are reflected by the exit 5 of the cover 55.
It becomes a leak X-ray from 5a. Leakage X-rays have an effect on the human body and must be reduced as much as possible.

For this reason, as shown in FIG.
By providing a plurality of shielding curtains 56 in one transport direction, X
It is configured to prevent wire leakage. The shielding curtain 56 is formed of a flexible thin lead-containing rubber curtain or the like.

[0005]

In the conventional structure, since the shielding curtain 56 is made of lead and the like, the frictional resistance of the surface is large. As shown in FIG. 6A, when the inspection object W comes into contact with the shielding curtain 56 during the conveyance of the conveyor 51, the inspection object W is caught and stopped, or as shown in FIG. And other problems. Even if a belt having a high friction coefficient is used for the conveyor 51 in order to increase the conveying force, the same problem as described above occurs due to the frictional force of the shielding curtain 56.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide an X-ray foreign matter detection device capable of stably transporting an inspection object while preventing leakage of X-rays. .

[0007]

In order to achieve the above object, an X-ray foreign matter detection device according to the present invention comprises an X-ray generating unit in the middle of a transport operation, which transports an inspected object in a transport unit. In an X-ray foreign matter detection device that emits X-rays, detects the X-rays with an X-ray detection unit, and detects foreign matter inside the inspection object, a plurality of X-ray foreign matter detection devices are provided along a transport direction of the transport unit, A flexible shielding curtain for preventing leakage of X-rays to the outside, and a flexible material which is made of a material having a small coefficient of friction on its surface and is provided on the front side of the shielding curtain in the transport direction of the transport unit. And a slippery sheet.

Further, according to the present invention, while the object to be inspected is conveyed by the conveying section, X-rays are emitted from the X-ray generating section during the conveyance to the object to be inspected, and the X-rays are detected by the X-ray detecting section. In the X-ray foreign matter detection device for detecting foreign matter inside the inspection object, a plurality of X-rays are provided along a transport direction of the transport unit, and have flexibility to prevent the X-rays from leaking to the outside, A shielding curtain having a sliding surface made of a material having a small friction coefficient is provided on the front side in the transport direction.

According to the above configuration, a plurality of shielding curtains 15 are provided along the transport direction of the transport unit 3 to prevent external leakage of X-rays. A sliding sheet 16 having a small coefficient of friction is provided on the front side of the shielding curtain 15 in the transport direction. Can be pushed up to pass in a stable state.

[0010]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a perspective view showing an example of the X-ray foreign matter detection device of the present invention. The X-ray foreign matter detection device mainly includes an X-ray generation unit 1 that generates X-rays, an X-ray detection unit 2 that receives X-rays from the X-ray generation unit 1, and an X-ray detection unit 2 that receives X-rays from the X-ray generation unit 1. And a transport unit 3 for transporting an inspection object (not shown).

The X-ray generation unit 1 is disposed on an upper part of a housing 5 forming a main body of the X-ray foreign matter detection device, and emits X-rays downward. The X-ray detection unit 2 is built in a metal box of the transport unit 3 arranged at the lower part of the housing 5. X-ray generator 1
It is configured to receive the X-rays emitted from. X
The line detector 2 converts this X-ray into light and outputs it to an X-ray processor (not shown).

The housing 5 is provided with an opening 5a in which the transport section 3 is disposed at the front side and forward and backward in the transport direction, and only a part of the side surface and the rear surface are continuously formed vertically. . The transport unit 3 has a side surface (one side surface along the transport direction) of the metal box portion fixed to the housing 5 and transports the inspection object with a predetermined transport length. During this conveyance, the X-ray generation unit 1
Then, the inspection object is passed through the planar X-rays irradiated toward the X-ray detection unit 2 from. The transport length of the transport unit 3 (the length of the X-ray detection device) is longer than the width of the housing 5, and the transport unit 3 protrudes from the housing 5 in the transport direction.

The transport section 3 includes a roller 8, a motor unit 4, and a transport belt 10. Two rollers 8 are arranged at each of the front and rear portions in the transport direction, each of which has a predetermined height in the height direction.
The line detector 2 can be accommodated.

The transport section 3 is entirely covered by a front cover 32, a rear cover 33, and a front cover 34 so as to prevent leakage of X-rays. The front cover 32 and the rear cover 33 are formed with openings 35 through which the inspection object is carried in and out. The front cover 34 is provided on the front side of the housing 5 and covers the front side of the transport unit 3. This front cover 34
The both sides are formed in a substantially trapezoidal shape along the shapes of the front cover 32 and the rear cover 33, and are pivotally supported by a hinge 36 provided at a lower portion so as to be openable to the front side.

FIG. 2 is a front view showing the transport section 3. As shown in the figure, since the transport length of the transport unit 3 is longer than that of the housing 5, the front cover 32 and the rear cover 33 are respectively provided on the upper and lower surfaces where the openings 35 protrude most from the housing 5 by a predetermined angle. Inclined surfaces 32a, 32b, 33a, 33b
Are formed. The inclined surfaces 32a, 32b, 33
The X-rays are reflected toward the inside of the device by the a and 33b, so that the leakage of the X-rays from the opening 35 can be reduced. The front cover 32, the rear cover 33, and the front cover 34 cover the entire periphery of the transport unit 3 so as to prevent leakage of X-rays inside.

On the transport section 3, shielding curtains 15 for X-ray shielding are suspended at a plurality of positions along the transport direction. In the illustrated example, each of the openings 35 of the front cover 32 on the carry-in side and the rear cover 33 on the carry-out side is provided.
And a plurality of sheets (a total of six sheets in the illustrated example) are suspended and arranged at predetermined intervals in the conveyance direction of the conveyance belt 10 in the opening 5a of the housing 5. The shielding curtain 15 is formed of a rubber curtain containing lead or the like, and prevents X-rays inside the device from leaking from the opening 35.

In the shielding curtain 15, a slip sheet 16 is overlapped and suspended on the front side of the transport section 3 in the transport direction. The slip sheet 16 is made of a resin material such as PP or Teflon (registered trademark) and has a small surface frictional resistance. And the same outer diameter (width and length) as the shielding curtain 15 and thin (about 0.1 to 0.2 mm)
Formed.

FIG. 3 is an enlarged view of the shielding curtain 15. As shown in FIG. 3A, these shielding curtains 1 are used.
5 and the slip sheet 16 are doubled so as to be arranged at a predetermined interval from each other. Further, as shown in FIG. 3B, the shielding curtain 15 and the sliding sheet 16 can be arranged so as to be in close contact with each other. The shielding curtain 15 and the sliding sheet 16 are attached to the opening 5 a of the housing 5 by an attachment 17 including an attachment plate and screws. By adjusting the space at the mounting member 17, the space between the shielding curtain 15 and the sliding sheet 16 can be arbitrarily changed from the close contact to the formation of a predetermined space.

The shielding curtain 15 and the sliding sheet 16 may be bonded to each other. Not only is the sliding sheet 16 provided separately from the shielding curtain 15 as described above, but also on the surface of the shielding curtain 15,
A configuration is also possible in which a slip surface 16a made of the same resin material as the slip sheet 16 is provided by coating.

As a result, a slip sheet 16 or a slip surface 16a is formed on one side of the shielding curtain 15, and an object to be inspected conveyed on the transfer section 3 is in contact with only the slip sheet 16 and the slip surface 16a to be shielded. Does not come into direct contact with the curtain 15.

As shown in the operation diagram of FIG.
Is in contact with the sliding sheet 16 that overlaps with the shielding curtain 15 when passing through the shielding curtain 15,
Since the slip sheet 16 has a small frictional resistance on the surface, the transport state of the inspection object W does not change even when the inspection sheet W contacts the slip sheet 16, and the inspection object W does not stop or rotate.
Even if the inspection object W is lightweight, the inspection object 16
Is only in contact with the sliding sheet 16 and the shielding curtain 15
Since no large friction occurs due to contact with the screen, it is possible to stably pass through the place where the shielding curtain 15 is hung while being placed at the time of loading.

As a result, the inspection object W can move on the transporting section 3 in a manner to push up the respective shielding curtains 15 via the sliding sheet 16 as shown in the figure. Since the inspection object W does not directly contact the shielding curtain 15 having a component such as lead, the inspection object W is not affected by the quality change.

[0023]

According to the present invention, X-ray leakage can be prevented by the shielding curtain, and the shielding curtain is provided with a sliding sheet having a small coefficient of friction on the front side in the transport direction. The object does not directly touch the shielding curtain at the time of transport, and can be transported in a stable state without stopping or reversing the inspected object.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an X-ray foreign matter detection device of the present invention.

FIG. 2 is a diagram illustrating a configuration of a transport unit.

FIG. 3 is a partially enlarged view of a shielding curtain.

FIG. 4 is an operation diagram showing a transport state of an inspection object.

FIG. 5 is a diagram for explaining X-ray leakage of the X-ray foreign matter detection device.

FIG. 6 is an operation diagram using a conventional shielding curtain.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... X-ray generation part, 2 ... X-ray detection part, 3 ... conveyance part, 5 ... housing | casing, 5a ... opening part, 10 ... conveyance belt, 15 ... shielding curtain, 16 ... slip sheet, 16a ... slip surface, W ...
Inspection object.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshifumi Yoshida F-term in Anritsu Technics Co., Ltd. 2-27-3 Shimomaruko, Ota-ku, Tokyo 2G001 AA01 BA11 CA01 DA02 JA09 KA03 SA10 SA14

Claims (2)

[Claims] An X-ray is emitted from an X-ray generation unit in the middle of transportation to an inspection object while the inspection object is being transported by a transportation unit, and the X-ray is detected by an X-ray detection unit. An X-ray foreign matter detection device for detecting foreign matter inside an inspection object, comprising: a plurality of flexible shielding curtains provided along a transport direction of the transport unit to prevent the X-rays from leaking outside; A flexible sliding sheet made of a material having a small coefficient of friction and superposed on the front side of the shielding curtain in the transport direction of the transport section.
Line foreign matter detection device. 2. An X-ray radiating section irradiates an X-ray from an X-ray generating section in the course of conveyance while the X-ray is being conveyed by a conveying section. In an X-ray foreign matter detection device for detecting foreign matter inside an inspection object, a plurality of X-ray foreign matter detection devices are provided along a transport direction of the transport unit, and have a flexibility of preventing leakage of the X-ray to the outside. An X-ray foreign matter detection device comprising a shielding curtain having a sliding surface formed of a material having a small friction coefficient on a front side.