JP2001318062A - X-ray foreign matter detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance shielding of a leakage X-ray from an X-ray generator and cooling of the X-ray generator. SOLUTION: This X-ray foreign matter detection device 1 is equipped with a ventilation trunk 40 for guiding the heat generated from the X-ray generator 10 to the outside, and a radiator 16 having a cooling fin 18 supported by penetrating a board 17 forming a part of the ventilation trunk 40 and sealing the X-ray generator, for transmitting the heat into the ventilation trunk 40. The ventilation trunk 40 has a pair of ventilation openings 27a communicated with the outside, and is formed linearly from one ventilation opening to the other ventilation opening. The board 17 forming a part of the ventilation trunk 40 is detachable together with the X-ray generator 10 from the ventilation trunk 40. The ventilation opening 27a is equipped with a detachable cooling fan mechanism 31 for cooling the cooling fin 18 in the ventilation trunk 40. In the ventilation trunk 40, the heat is radiated from the radiator 16, and the leakage X-ray is attenuated by repeating absorption or scattering on the inner surface of the ventilation trunk 40.

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 device that irradiates X-rays from a X-ray generator and detects foreign matter in the inspection object from the amount of transmission of the X-rays, and in particular, shields X-rays leaking from the X-ray generator. X while doing
The present invention relates to an X-ray foreign matter detection device for cooling a X-ray generator.

[0002]

2. Description of the Related Art An X-ray foreign matter detection apparatus irradiates an X-ray to an inspection object such as a food product such as meat or processed food, and detects the amount of metal or the like in the inspection object based on the amount of transmitted X-ray. This is a device that detects whether a foreign substance is present.

An X-ray generator that irradiates X-rays is sealed by immersing an X-ray tube provided inside a metal box with insulating oil. Since the X-ray tube itself generates heat by X-ray exposure, it is necessary to cool the X-ray tube by radiating the heat conducted from the X-ray tube to the insulating oil to the outside.

As means for dissipating the heat conducted from the X-ray tube to the insulating oil to the outside, cooling fins penetrated and held on the peripheral surface of the X-ray generator are usually used to conduct heat from the insulating oil. Heat is radiated outside the X-ray generator. However, cooling fins are usually made of Al having good heat transfer characteristics.
Since 1 has a high transmittance of X-rays, the X-rays leak together with the heat radiation.

[0005] For this reason, conventionally, Japanese Unexamined Patent Application Publication No.
As shown in Japanese Patent Publication No. 05, the X-ray generator provided with cooling fins on the outer peripheral surface is shielded by a hood, and the gap between the outer peripheral surface of the X-ray generator and the inner peripheral surface of the hood is blown by a cooling fan to generate X-rays. Cooling fins on the outer peripheral surface of the vessel are cooled.

[0006]

However, since the gap between the X-ray generator and the hood serves as an air passage, the side surface of the X-ray generator obstructs the air flow. Are bypassed, and the cooling efficiency is not improved. Further, since the hood is lifted up and removed by an operator, labor is required for maintenance of the X-ray generator.

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned disadvantages, and has as its object to shield X-rays leaking from an X-ray generator and to cool the X-ray generator. .

Another object of the present invention is to improve the cooling rate of the heat transfer member by forming the ventilation passage in a straight line. In particular, by providing a cooling mechanism in at least one of both ends of the ventilation path, the cooling rate of the heat transfer member can be further improved.

Still another object is to provide an X-ray generator provided with a radiator so that the X-ray generator can be attached to and detached from an air passage.
An object of the present invention is to simplify maintenance of a wire generator.

[0010]

In short, an X-ray foreign matter detecting apparatus according to a first aspect of the present invention emits X-rays from an X-ray generator (10) to an object to be inspected, so that the X-ray foreign matter is detected. An X-ray foreign matter detection device for detecting foreign matter in the object to be inspected from the amount of transmitted light, wherein a ventilation path (40) for guiding heat generated from the X-ray generator to the outside and a part of the ventilation path A substrate (17) for sealing the X-ray generator; and a heat transfer member (1) supported through the substrate and transmitting the heat to the ventilation path.
8) and a radiator (16) having the following.

According to a second aspect of the present invention, there is provided an X-ray foreign matter detecting apparatus as set forth in the first aspect.
The ventilation path has a pair of ventilation ports (27a,
27a), and is formed linearly from the one ventilation opening toward the other ventilation opening.

Further, the X-ray foreign object detecting device according to claim 3 of the present invention is the X-ray foreign object detecting device according to claim 2,
The substrate forming a part of the ventilation path is configured to be detachable from the ventilation path together with the X-ray generator.

According to a fourth aspect of the present invention, there is provided an X-ray foreign substance detecting apparatus as set forth in the first aspect.
The ventilation path has ventilation holes communicating with the outside,
A pair of cylinders (27, 27) provided in a straight line, the substrate, and the substrate and the pair of cylinders connected together;
A detachable shielding member (21) for covering the heat transfer member on the substrate; and a connecting passage (20) formed of the X-ray provided with the radiator. It is characterized by being configured to be detachable between the pair of cylinders together with the generator.

According to a fifth aspect of the present invention, there is provided an X-ray foreign matter detecting apparatus according to any one of the second to fourth aspects, wherein the ventilating hole is provided in at least one of the ventilation holes. It is characterized by comprising a detachable cooling means (31) for cooling the heat conducting member provided in the path.

Heat generated from the X-ray generator 10 is transmitted to the ventilation path 40 by the heat transfer member 18, and X-rays leak from the X-ray generator 10 via the heat transfer member 18. In the ventilation path 40, heat is released from the heat transfer member 18, or the heat transfer member 18 is forcibly cooled by the cooling unit 31,
Releases heat to the outside. The leaked X-rays are attenuated by repeatedly absorbing and scattering on the inner surface of the ventilation passage 40.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment
An embodiment will be described. FIG. 1 is a schematic perspective view showing an X-ray foreign matter detection device according to the present invention. The X-ray foreign matter detection device 1 includes raw meat, fish, processed food,
The apparatus includes a conveyor 3 for transporting an inspection object such as a medicine, and a foreign object detection unit 6 for detecting a foreign object in the transportation path of the inspection object.

The conveyor 3 is driven by a drive motor (not shown) to transfer the inspection object carried in from the carry-in port 4 to the carry-out port 5.
To be carried out. The foreign matter detector 6 includes an X-ray generator 10 provided above the conveyor 3 and an X-ray detector 7 provided inside the conveyor 3.

The X-ray detector 7 detects the X-rays
It is detected from the transmission amount of the line whether or not foreign matter such as metal scrap and bone is included.

As shown in FIG. 2, the X-ray generator 10 has a cylindrical X-ray tube 1 provided inside a metal box 11.
2 is immersed in an insulating oil 13, as shown in FIG.
As shown in (1), an electron beam from the cathode of the X-ray tube 12 is irradiated on the anode target to generate X-rays. X-ray tube 12
Is provided such that its longitudinal direction is orthogonal to the transport direction of the inspection object. The generated X-rays are emitted toward a lower X-ray detector 7 through a slit (not shown) along the longitudinal direction, where the substantially conical X-rays are formed into a substantially triangular screen. It has become.

As shown in FIG. 2, a fitting portion 14 to be fitted in a fitting groove 30 of a mounting table 29 described later is provided on the outer bottom surface of the box 11. Further, L-shaped angles 15, 15 are provided on both outer side surfaces of the box body 11 opposed to each other in the transport direction, and are flush with the outer bottom surface of the box body 11. The opening edge 11a at the top of the box 11 is formed in a flange shape.

The radiator 16 has a plurality of (twelve in the figure) rod-shaped cooling fins 18 penetrating a rectangular substrate 17 from the front surface to the back surface. Substrate 17 of radiator 16
Is supported by the opening edge 11a of the box body 11 to seal the opening 11b of the box body 11, and one end 18a of each cooling fin 18 is housed in the opening 11b of the box body 11 and immersed in the insulating oil 13. ing. The radiator 16 may have a structure in which a plurality of inverted U-shaped cooling fins penetrate the substrate 17 from the front surface to the back surface.

A substantially U-shaped shielding member 21 for shielding X-rays leaking from the other end 18b of each cooling fin 18 is provided on the substrate 17. The shielding member 21 includes iron,
A metal that does not transmit X-rays, such as lead, is used. Projecting pieces 21 a are formed on both opening edges of the shielding member 21,
Fixed on top. The other end 18b of each cooling fin 18 protruding from the surface of the substrate 17 is
b. Both sides of the shielding member 21 in the transport direction are open. The surface of the substrate 17 of the radiator 16 forms a connection passage 20 with the inner surface of the opening groove 21 b of the shielding member 21.

As shown in FIG. 1, an openable and closable front plate 8 is provided on the upper front surface of the apparatus main body 2 so as to house an X-ray generator 10 therein. Device body 2
Opening windows 9 are formed on both upper side surfaces of the.

FIG. 3 is a partial cross-sectional view of the upper portion of the apparatus main body 2 when the X-ray generator 10 to which the shielding member 21 and the radiator 16 are attached is not housed, and FIG. FIG. 5 is a partial cross-sectional view of the upper part of the apparatus main body 2, and FIG.

As shown in FIGS. 3 and 4, the upper part of the apparatus main body 2 is partitioned by a partition plate 22 into a control room 23 and a storage room 26. In the control room 23, a control unit 24 such as a circuit board for controlling the foreign object detection unit 6, the conveyor 3, and the like is separated from the storage room 26 by the partition plate 22 and is formed on the upper side of one side of the apparatus main body 2. Cooling fan mechanism 2
5 to cool the control unit 23.

As shown in FIG. 4, the X-ray generator 10 having the shielding member 21 and the radiator 16
Is stored. Opening windows 9 communicating with the outside are formed above both outer side surfaces of the storage chamber 26. At both ends of the back surface of the partition plate 22, a pair of rectangular cylinders 27, 27 having both ends opened are provided.
Are fixed, one end 27a of which is in contact with the inner opening edge of the opening window 9 to form a ventilation port communicating with the outside. The other ends 27b of the rectangular cylinders 27 are opposed to each other, and the connection passages 20 are connected between the other ends 27b so as to form one linear ventilation path 40 along the conveyance direction of the conveyed object. Has become. Similar to the shielding member 20, a metal that does not transmit X-rays, such as iron or lead, is used for the rectangular cylinder 27.

A mounting table 29 is provided on the bottom surface of the storage chamber 26, and a fitting groove 30 for fitting with the fitting portion 14 of the X-ray generator 10.
Are formed. The X-ray generator 10 is mounted by fitting the fitting portion 14 into the fitting groove 30 of the mounting table 29 and slides in the depth direction. The mounting table 29 is provided with, for example, a limit switch (not shown). When the X-ray generator 10 is slid to a desired position, the X-ray generator 10 is engaged with an operation piece of the limit switch and positioned. On the upper surface of the mounting table 29, a protruding piece 29a is formed toward the outside,
It is fixed to the angle 15 by bolting. Note that the X-ray generator 10 may be positioned using a proximity sensor instead of the limit switch.

Next, the operation of the present embodiment will be described. First, as shown in FIG.
1 is sealed with a radiator 16 and the cooling fins 18 are closed.
The shielding member 21 is mounted on the substrate 17 so as to cover.

Next, the storage chamber 26 is opened by pulling the front plate 8 of the apparatus main body 2 toward the user. Then, the X-ray generator 10 is placed on the mounting table 29, and the fitting portion 14 is fitted into the fitting groove 30 of the mounting table 29.
Is fitted. The X-ray generator 10 is slid in the depth direction orthogonal to the transport direction, engaged with the operation piece of the limit switch, positioned, and the X-ray generator 10 is fixed to the mounting table 29.

At this time, both side edges of the shielding member 21 are
As shown in FIG. 7, the pair of rectangular cylinders 27 abut on the opening edges of the other ends 27 b of the pair of rectangular cylinders 27 facing each other.
The connecting passage 20 is connected between the connecting passages to form a ventilation path 40 along the transport direction.

When the positioning of the X-ray generator 10 is completed,
The front plate 8 is closed, the conveyor 3 is operated to transport the inspection object, and X-rays are emitted from the X-ray generator 10. Then, the X-ray detector 10 detects whether or not a foreign substance is included based on the amount of transmitted X-rays.

At this time, the X-rays pass through the insulating oil 13 and the cooling fins 18 and leak into the ventilation passage 40. The leaked X-rays are attenuated by repeating absorption and scattering on the inner peripheral surface of the ventilation path 40.

When the X-ray irradiation is continued, the X-ray tube 12 generates heat, and one end 18 a of the cooling fin 18
Is transmitted to the other end 18b protruding toward the ventilation passage 40 side. Then, the heat is radiated to the outside from the ventilation holes 27a, and the cooling fins 18 are cooled.

Therefore, in the X-ray foreign matter detector 1 configured as described above, X-rays leaked from the cooling fins 18 can be attenuated. Also, the other end 18 of the cooling fin 18
Since b is located in the linear ventilation path 40, heat can be efficiently radiated without any other barrier. Further, since the X-ray generator 10 is configured to be detachable from the apparatus main body 2, maintenance of the X-ray generator can be easily performed.

In the above-described embodiment, FIG.
As shown in FIG. 9, a cooling fan mechanism 31 may be attached to at least one of the ventilation holes 27a as cooling means. The cooling fan mechanism 31 fixes a pair of L-shaped angles 32 to the inner peripheral surface of one end 27 a of the rectangular cylinder 27, and makes the cooling fan 37 contact the inner surfaces of the bent portions of the angles 32, 32 to form the angle 32. With a screw 33. Then, the cooling fan 37 is covered with the filter 34, and the fastener 35 is engaged with the side of the apparatus main body 2, and the ventilation port 27 is
The louvered lid 36 is attached to a. Cooling fan 37
Is provided with a connector (not shown), and wiring is routed from the control unit 24 of the control room 23 to be connected and supplied with power.

As a result, it is possible to forcibly ventilate the ventilation passage 40, cool the cooling fins 18, and suppress the temperature rise of the X-ray generator 10. In addition, ventilation opening 27a
Is not in communication with the storage chamber 26 of the X-ray generator 10, so that the X-ray does not leak and the cooling fan 37 and the filter 34
Can be attached and detached, making assembly and replacement easy.

[0037]

As described above, the X-ray foreign matter detection device according to the present invention can shield the leaked X-rays from the X-ray generator and cool the X-ray generator.

Further, by forming the ventilation passage in a straight line, the cooling rate of the heat transfer member can be improved. In particular, by providing a cooling mechanism in at least one of the openings at both ends of the ventilation passage, the cooling rate of the heat transfer member can be further improved, and the X-ray generator can be attached and detached without leaking X-rays. Independently from the above, the cooling fan and the filter can be attached and detached from the outside, so that assembly and replacement can be easily performed.

Further, the maintenance of the X-ray generator can be simplified by configuring the X-ray generator provided with the radiator so as to be detachable from the air passage.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an X-ray foreign matter detection device according to the present invention.

FIG. 2 is a view showing X stored in an X-ray foreign matter detection device according to the present invention;
FIG. 3 is an exploded perspective view of a wire generator, a radiator, and a shielding member.

FIG. 3 is a front partial cross-sectional view of an upper portion of an apparatus main body of the X-ray foreign matter detection device according to the present invention.

FIG. 4 is a front partial cross-sectional view of the X-ray foreign matter detection device according to the present invention when an X-ray generator is housed in an upper portion of the device main body.

FIG. 5 is a partial sectional side view of the same.

FIG. 6 is a perspective view before connecting a connection passage between the rectangular cylinders.

FIG. 7 is a perspective view when a connection passage is connected between the rectangular cylinders.

FIG. 8 is an exploded side view of the cooling fan mechanism.

FIG. 9 is a front partial sectional view when the cooling fan mechanism is attached.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... X-ray foreign substance detection apparatus, 10 ... X-ray generator, 16 ... Radiator, 17 ... Substrate, 18 ... Heat transfer member, 19 ... Connection passage,
20 ... Shielding member, 28 ... Cylinder, 28a ... Ventilation opening, 31 ...
Cooling means, 40 ... ventilation path

Claims (5)

[Claims] 1. An X-ray foreign matter detection device that irradiates an X-ray to an inspection object from an X-ray generator (10) and detects a foreign object in the inspection object based on a transmission amount of the X-ray. A ventilation path (4) for guiding heat generated from the X-ray generator to the outside
0), a substrate (17) which forms a part of the ventilation path and seals the X-ray generator, and a heat transfer member (18) supported through the substrate and transmitting the heat to the ventilation path. ) And a radiator (16) having the following. 2. The ventilation path has a pair of ventilation ports (27a, 27a) communicating with the outside, and is formed linearly from the one ventilation port to the other ventilation port. The X-ray foreign matter detection device according to claim 1, wherein: 3. The X-ray foreign matter detection device according to claim 2, wherein the substrate forming a part of the ventilation path is configured to be detachable from the ventilation path together with the X-ray generator. 4. The air passage has a pair of cylinders (27, 27) each having a ventilation port communicating with the outside and provided in a straight line, the substrate, and the pair of cylinders together with the substrate. And a detachable shielding member (21) for covering the heat transfer member on the substrate, and a connection passage (20) comprising: a connection passage formed by the radiator. 2. The X-ray foreign matter detection device according to claim 1, wherein the X-ray foreign matter detection device is configured to be detachable between the pair of cylindrical bodies together with the provided X-ray generator. 5. A detachable cooling means (31) for cooling the heat conducting member provided in the ventilation passage, in at least one of the ventilation openings. 5. The X-ray foreign matter detector according to any one of 4.