JP4351901B2 - Radiation inspection equipment - Google Patents

Description

  The present invention relates to a radiation inspection apparatus, and more particularly to a radiation inspection apparatus including a leakage prevention curtain that suppresses radiation from leaking from an opening to the outside of an examination room.

  In the production line of products such as foods, a radiation inspection apparatus using X-rays or the like may be used in order to avoid shipping such products when foreign matters are mixed into the products or the products are cracked. . In this radiation inspection apparatus, X-rays are irradiated to an object to be inspected continuously, and the transmission state of the X-ray is detected by a radiation detection unit such as an X-ray line sensor. It is determined whether or not foreign matter is mixed in or whether the inspection object is cracked or missing or the number of unit objects in the inspection object is insufficient. Further, the number of unit objects in the inspection object is counted by a radiation inspection apparatus.

  In many radiological inspection apparatuses, openings (carrying inlets and outlets) are provided on the side surfaces of the main body, and the inspection object is carried into the inspection chamber in the main body by a transport mechanism such as a belt conveyor passing through the opening. Or taken out of the laboratory.

  In addition, the opening is often closed with a leakage prevention curtain so that radiation does not leak from the examination room to the outside through the opening. The inspection object conveyed to the inspection room in the main body of the radiation inspection apparatus enters the inspection room so as to push open the leakage prevention curtain. The leakage prevention curtain opens the opening only when the inspection object passes through the opening, and closes the opening again when the inspection object passes the opening.

A radiation inspection apparatus capable of removing such a leakage prevention curtain from the main body is disclosed in Patent Document 1.
JP2003-156456 (released on May 30, 2003)

  In the radiation inspection apparatus disclosed in Patent Document 1, a support frame constituted by two opposing L-shaped members is provided on the inner wall of the inspection chamber near the carry-in port and the carry-out port. Then, a cassette frame for suspending a leakage prevention curtain (a lead-containing rubber noren) is attached to and detached from the support frame. With such a configuration, the leakage prevention curtain can be removed from the main body constituting the examination room, and the ease of inspection and cleaning in the examination room is ensured.

  Moreover, in the radiation inspection apparatus of patent document 1, the interlock mechanism which turns on and off the electric power supply to a radiation source by the attachment or detachment of a cassette frame is provided, and the front-end | tip of a cassette frame is installed in the back | inner side of the inspection room. When the switch is not pressed, the power is not turned on.

  However, in the case of adopting the configuration of the radiation inspection apparatus disclosed in Patent Document 1, the cassette frame including the support rod for suspending the leakage prevention curtain becomes relatively heavy. The burden on the operator who attaches and detaches becomes very large. Further, since the switch is installed on the back surface of the examination room, dust and dust are likely to be collected in the vicinity of the switch, and the burden of the operator's cleaning work when cleaning the examination room during maintenance is increased.

  The subject of this invention is providing the radiation inspection apparatus which can reduce the burden of the operator who removes a leakage prevention curtain and performs a maintenance.

  The radiation inspection apparatus according to the first invention includes a main body, a leakage prevention curtain, and a curtain support. The main body has an opening for carrying in and / or carrying out the inspection object. In addition, an inspection room for irradiating the inspection object with radiation is formed inside the main body. The leakage prevention curtain prevents radiation from leaking from the opening to the outside of the examination room. The curtain support body is detachable from the main body, and has a suspension member that suspends the leakage prevention curtain. And the circular pipe is employ | adopted as a suspension member of a curtain support body. The radiation inspection apparatus according to the present invention further includes a switching mechanism and a movement restriction mechanism. The switching mechanism switches between a first state in which the curtain support can be removed from the main body and a second state in which the curtain support cannot be removed from the main body. The movement restricting mechanism is provided separately from the switching mechanism. This movement restricting mechanism restricts the curtain support from moving in the removal direction with respect to the main body.

  In this radiation inspection apparatus, inspection is performed by applying radiation to an object to be inspected in an inspection room. However, since the opening exists, there is a possibility that the radiation in the inspection room leaks from the opening to the outside. In view of this, the radiation inspection apparatus is provided with a leakage prevention curtain to suppress leakage of radiation from the opening to the outside of the inspection room.

  And the curtain support body which has the suspending member which suspends a leakage prevention curtain is provided in the main body so that attachment or detachment is possible so that a leakage prevention curtain can be removed from a main body at the time of a maintenance or cleaning of an inspection room. When the curtain support is removed from the main body, the leakage preventing curtain is removed from the main body.

  For an operator who attaches / detaches the curtain support including the leakage prevention curtain to / from the main body, the curtain support is preferably as light as possible.

  In view of such a demand, here, a hollow circular pipe is employed as a hanging member of the curtain support instead of a solid round bar. The anti-leakage curtain that suppresses the leakage of radiation is very heavy because it contains lead and is very heavy, but since the hollow circular pipe is used as a suspension member, the weight of the suspension member is reduced while ensuring the necessary strength. can do. Thus, by using a circular pipe as the suspension member of the curtain support, the burden on the operator who removes or attaches the leakage prevention curtain to the main body for maintenance including inspection room cleaning is reduced. Can do.

  In addition, here, the curtain support body cannot be removed from the main body by switching the state of the curtain support body to the second state by the switching mechanism. The movement in the removal direction is restricted. Thereby, the malfunction that a curtain support body shifts | deviates with respect to a main body by the contact to the leakage prevention curtain of a to-be-inspected object, etc., and the leakage amount of the radiation from opening increases will be suppressed more.

  The radiation inspection apparatus according to the second invention is the radiation inspection apparatus according to the first invention, and further includes a support member. The support member is fixed to the main body and introduces and supports the curtain support in the vicinity of the opening in the examination room. The support member has a circular outer peripheral cross-sectional shape. This circle includes not only a perfect circle but also an ellipse.

  Here, a configuration is adopted in which the curtain support is introduced into the examination room and the support member that supports the curtain support is fixed to the main body, and the outer peripheral cross-sectional shape of the support member is circular. Therefore, even when the support member is located inside the examination room, the support member is less likely to cause dust or the like to accumulate. In addition, it is easy to clean the support member when cleaning the examination room.

  A radiation inspection apparatus according to a third invention includes a main body, a leakage prevention curtain, a curtain support, and a first detection device. The main body has an opening for carrying in and / or carrying out the inspection object. In addition, an inspection room for irradiating the inspection object with radiation is formed inside the main body. The leakage prevention curtain prevents radiation from leaking from the opening to the outside of the examination room. The curtain support body is detachable from the main body, and has a suspension member that suspends the leakage prevention curtain. The first detection device detects that the curtain support is not attached to the main body. The first detection device is arranged outside the examination room. The radiation inspection apparatus according to the present invention further includes a switching mechanism and a movement restriction mechanism. The switching mechanism switches between a first state in which the curtain support can be removed from the main body and a second state in which the curtain support cannot be removed from the main body. The movement restricting mechanism is provided separately from the switching mechanism. This movement restricting mechanism restricts the curtain support from moving in the removal direction with respect to the main body.

  In this radiation inspection apparatus, inspection is performed by applying radiation to an object to be inspected in an inspection room. However, since the opening exists, there is a possibility that the radiation in the inspection room leaks from the opening to the outside. In view of this, the radiation inspection apparatus is provided with a leakage prevention curtain to suppress leakage of radiation from the opening to the outside of the inspection room.

  And the curtain support body which has the suspending member which suspends a leakage prevention curtain is provided in the main body so that attachment or detachment is possible so that a leakage prevention curtain can be removed from a main body at the time of a maintenance or cleaning of an inspection room. When the curtain support is removed from the main body, the leakage preventing curtain is removed from the main body.

  However, if the curtain support is removed from the main body and radiation is applied to the object to be inspected in the examination room without the leakage prevention curtain, the amount of radiation leaking from the opening to the outside of the examination room increases. In view of this, here, a first detection device for detecting that the curtain support is not attached to the main body is provided, and radiation of the examination room can be prohibited when the curtain support is not attached to the main body. I have to.

  Furthermore, while the conventional configuration employs a configuration in which detection of the curtain support body on the inside of the examination room is detected, a configuration in which the first detection device is disposed outside the examination room is employed here. ing. For this reason, it is easy to flatten the inside of the examination room, and the burden on the operator who performs maintenance such as cleaning by removing the leakage prevention curtain can be reduced. In particular, in a radiation inspection apparatus that handles an object to be inspected such as food, the degree of cleanliness in the inspection room tends to be emphasized, and the present invention that can eliminate the detection apparatus from the inspection room is very useful. In addition, since the first detection device is outside the examination room, the probability of occurrence of a malfunction such as damage to the first detection device during cleaning of the examination room is reduced.

  In addition, since the first detection device is outside the examination room, depending on the structure of the first detection device, whether or not the first detection device has definitely detected that the curtain support is not attached to the main body. There is also a secondary effect that makes it easier to see.

  In addition, here, the curtain support body cannot be removed from the main body by switching the state of the curtain support body to the second state by the switching mechanism. The movement in the removal direction is restricted. Thereby, the malfunction that a curtain support body shifts | deviates with respect to a main body by the contact to the leakage prevention curtain of a to-be-inspected object, etc., and the leakage amount of the radiation from opening increases will be suppressed more.

The radiation inspection apparatus according to a fourth invention is a radiological imaging apparatus of the third aspect of the present invention, further comprising a second detection equipment. A 2nd detection apparatus detects that a curtain support body is a 1st state which can be removed from a main body.

  In the first state in which the curtain support is removable from the main body, it is not preferable to operate the radiation inspection apparatus because the curtain support including the leakage preventing curtain may come off from the main body. In view of this, here, a second detection device for detecting the first state is provided, so that the first state can be recognized, and the radiation inspection apparatus can be prevented from operating in the first state. Yes.

  A radiation inspection apparatus according to a fifth aspect of the present invention is the radiation inspection apparatus according to the fourth aspect of the present invention, and the second detection apparatus also serves as the first detection apparatus.

  A radiation inspection apparatus according to a sixth aspect of the present invention is the radiation inspection apparatus according to any one of the third to fifth aspects of the present invention, further comprising a display device. The display device displays that the curtain support is removed when the detection device detects that the curtain support is removed from the main body.

  A radiological inspection apparatus according to a seventh aspect of the present invention is the radiological inspection apparatus according to any one of the first to sixth aspects, wherein the upper part of the leakage preventing curtain overlaps with the suspension member in the height direction.

  Here, for example, when the suspension member that suspends the leakage prevention curtain is at a position lower than the upper end of the opening, radiation in the examination room leaks to the outside through the opening even at the height position where the suspension member exists. It is necessary to adopt some kind of shielding configuration so as not to do so. In view of this, here, the upper part of the leakage preventing curtain is configured to overlap the hanging member. As a result, even at the height position where the suspension member exists, the upper part of the leakage preventing curtain plays a role of suppressing leakage of radiation from the examination room to the outside.

  In particular, in the present invention, a circular pipe is used as a suspension member and the suspension member has a relatively thin wall thickness. Therefore, the radiation leakage prevention effect of the suspension member alone is better than that of a solid round bar or the like. Although small, the upper part of the leakage prevention curtain overlaps with the circular pipe as the suspension member in the height direction, so that radiation leakage from the opening can be sufficiently suppressed.

  A radiological inspection apparatus according to an eighth aspect of the present invention is the radiological inspection apparatus according to the seventh aspect, wherein the upper part of the leakage preventing curtain is wound around a suspension member.

  Here, by winding the upper part of the leakage prevention curtain around a suspension member that is a circular pipe, a configuration in which the upper part of the leakage prevention curtain overlaps the suspension member in the height direction is realized relatively easily. Further, when the leakage preventing curtain is wound around the suspension member, the leakage prevention curtain is doubled at the height position of the suspension member.

  In addition, since the suspension member is a circular pipe, even when the leakage prevention curtain is wound around the suspension member, a problem such that the corner of the suspension member contacts the leakage prevention curtain and the leakage prevention curtain is hardly damaged.

  According to the radiation inspection apparatus of the present invention, since the weight of the suspension member can be reduced while ensuring the necessary strength, the leakage prevention curtain is removed from the main body or the main body for performing maintenance including cleaning of the inspection room. It is possible to reduce the burden on the worker who attaches to the machine.

[Configuration of the whole X-ray inspection system]
An X-ray foreign substance inspection apparatus (radiation inspection apparatus) according to an embodiment of the present invention will be described below with reference to FIGS.

  As shown in FIG. 1, the X-ray foreign substance inspection apparatus 10 according to the present embodiment is one of apparatuses that perform quality inspection in a production line for products such as food. The X-ray foreign matter inspection apparatus 10 irradiates X-rays to products that are continuously conveyed, and inspects whether foreign matters are mixed in the products based on the X-ray dose that has passed through the products.

  As shown in FIG. 4, the product G, which is an inspection object of the X-ray foreign substance inspection apparatus 10, is conveyed to the X-ray foreign substance inspection apparatus 10 by the front conveyor 60. The product G is determined by the X-ray foreign matter inspection apparatus 10 for the presence or absence of foreign matter. The determination result in the X-ray foreign substance inspection apparatus 10 is sent to a distribution mechanism 70 disposed on the downstream side of the X-ray foreign substance inspection apparatus 10. The distribution mechanism 70 sends the product G to the regular line conveyor 80 when the product G is determined to be a non-defective product in the X-ray foreign material inspection apparatus 10, and determines that the product G is a defective product in the X-ray foreign material inspection device 10. If it is, the product G is distributed to the defective product storage conveyor 90.

<Configuration of X-ray foreign substance inspection device>
As shown in FIGS. 1 and 2, the X-ray foreign substance inspection apparatus 10 mainly includes a shield box 11, a conveyor 12, an X-ray irradiator (X-ray source) 13, an X-ray line sensor 14, and a touch panel function. And a control computer 20 (see FIG. 5).

[Shield box]
The shield box 11 has an opening 11a for carrying in and out the product on both the entrance side and the exit side of the product G. In this shield box 11, a conveyor 12, an X-ray irradiator 13, an X-ray line sensor 14, a control computer 20 and the like are accommodated.

  Further, as shown in FIG. 1, the opening 11 a is closed by a shielding nole (leak prevention curtain) 16 in order to prevent leakage of X-rays to the outside of the shield box 11. This shielding nolen 16 has a rubber nolene portion containing lead, and is pushed away by the product when the product is carried in and out. This shielding noren will be described in detail later.

  Further, in addition to the monitor 26, a key insertion slot and a power switch are arranged on the upper front portion of the shield box 11.

〔Conveyor〕
The conveyor 12 conveys goods in the shield box 11, and is driven by a conveyor motor 12a shown in FIG. The conveyance speed by the conveyor 12 is finely controlled by the inverter control of the conveyor motor 12a by the control computer 20 so as to be the set speed input by the operator.

[X-ray irradiator]
As shown in FIG. 2, the X-ray irradiator 13 is disposed above the conveyor 12 and irradiates the X-ray line sensor 14 below with X-rays (see the hatched area X in FIG. 2). To do.

[X-ray line sensor]
The X-ray line sensor 14 is disposed below the conveyor 12 and detects X-rays that pass through the product G and the conveyor 12. As shown in FIG. 3, the X-ray line sensor 14 includes a large number of pixels 14 a that are horizontally arranged in a straight line in a direction orthogonal to the conveying direction by the conveyor 12.

〔monitor〕
The monitor (display device) 26 is a full dot display liquid crystal display. Further, the monitor 26 has a touch panel function, and displays a screen that prompts input of parameters relating to initial setting and defect determination.

  The monitor 26 displays an X-ray image after image processing described later is performed. This allows the user to visually recognize the presence / absence, location, size, etc. of the foreign matter contained in the product G.

  Furthermore, the monitor 26 displays the detection result in the interlock 31 described later.

[Control computer]
In the CPU 21, the control computer 20 executes an image processing routine, an inspection determination processing routine, and the like included in the control program. The control computer 20 also stores and accumulates images and inspection results used for inspection of defective products in a storage unit such as the HDD 25.

  As a specific configuration, as shown in FIG. 5, the control computer 20 includes a CPU 21, and a ROM 22, a RAM 23, and an HDD (hard disk) 25 as main storage units controlled by the CPU 21. The HDD 25 stores a threshold file 25a for storing a threshold value of density, which will be described later, an inspection result log file 25b for storing inspection images and inspection results, and the like. The control computer 20 also has an FDD (flexible disk drive) 24 that performs input / output with the flexible disk.

  Further, the control computer 20 includes a display control circuit for controlling data display on the monitor 26, a key input circuit for fetching key input data from the touch panel of the monitor 26, and an I / O for controlling data printing in a printer (not shown). It has a port.

  The CPU 21, ROM 22, RAM 23, FDD 24, HDD 25, and the like are connected to each other via a bus line such as an address bus or a data bus.

  The control computer 20 is connected to a conveyor motor 12a, a rotary encoder 12b, a photoelectric sensor 15, an X-ray irradiator 13, an X-ray line sensor 14, and the like.

  The rotary encoder 12b is mounted on the conveyor motor 12a, detects the conveyance speed of the conveyor 12, and transmits it to the control computer 20.

  The photoelectric sensor 15 is a synchronous sensor for detecting the timing at which the product G, which is an object to be inspected, comes to the position of the X-ray line sensor 14, and is composed of a pair of light projectors and light receivers arranged with a conveyor interposed therebetween. Yes.

[Shielding noren mounting mechanism]
As shown in FIGS. 6 to 8, the X-ray foreign substance inspection apparatus 10 of the present embodiment includes a shielding nolen (leak prevention curtain) 16, a circular pipe (hanging member) 17, and a support frame as an attachment mechanism for the shielding nolen 16. (Curtain support) 18 includes a shield noren unit 50 and a shaft (support member) 19 for guiding the shield noren unit 50 to the inspection room S in the shield box 11.

  The shielding nolen 16 is a lead-containing sheet for preventing X-rays from leaking to the outside of the shielding box 11. In the shielding nolen unit 50 of the present embodiment, three pieces are provided on each of the inlet side and the outlet side. It has a seat. Further, the shield noren 16 is attached in the examination room S which is an examination space so as to cover both the entrance 11a and the exit 11a of the shield box 11. Thereby, it can prevent that X-rays leak from the opening 11a of the entrance side and exit side of goods. Further, the shielding nolen 16 is suspended so that its upper part is wound around the circular pipe 17. The shield noren 16 can be attached to and detached from the main body (X-ray foreign substance inspection apparatus 10) together with the circular pipe 17 and the support frame 18 during maintenance of the X-ray foreign substance inspection apparatus 10 or cleaning of the inspection room S. It is attached.

  As shown in FIGS. 6 and 7, the circular pipe 17 suspends the above-described shielding noren 16 and both ends thereof are supported by the support frame 18. Further, as shown in FIG. 9, the circular pipe 17 is a thin-walled pipe having a hollow inside, and both end portions thereof are closed and sealed. Thereby, even when the circular pipe 17 is removed and washed, it is possible to prevent germs from growing in the pipe.

  As shown in FIG. 10, the support frame 18 is formed with a protruding portion 18a, an insertion portion 18b, and a patchon lock (switching mechanism) 18c.

  The protruding portion 18 a is a portion formed to protrude on both sides in the longitudinal direction of the support frame 18. Further, the protruding portion 18 a guides the shielding noren 16 into the examination room S along the shaft 19 attached in the examination room S.

  The insertion portion 18b protrudes inward of the support frame 18, and is inserted into a hole of an interlock 31 provided on the outer wall surface of the shield box 11 when the shield noren 16 is attached to the main body side.

  As shown in FIG. 11 (b), the patchon lock 18c has its ring portion 18d hooked on a hook portion 32 formed on the outer wall surface of the shield box 11, and as shown in FIG. To fix. As a result, when the shield noren 16 is attached to the main body side, the insertion portion 18b is inserted into the above-described interlock 31 (first state), and then a hook portion (switching mechanism) provided on the outer wall surface of the shield box 11 ) The ring portion 18d is hooked and fixed to 32 (second state).

  In addition, the said 1st state means the state which can remove the support frame 18 from a main body, as shown to Fig.11 (a), and the said 2nd state means a main body, as shown in FIG.11 (c). The support frame 18 cannot be removed. Furthermore, the patch lock 18c and the hook 32 are provided as a switching mechanism for switching between the first state and the second state.

  The shaft 19 is a round bar having a circular cross section and a diameter of 8π for introducing the above-described shielding noren unit 50 into the examination room S. Further, two shafts 19 are attached to the entrance side and the exit side, respectively, in the inspection room S inside the shield box 11 so as to be orthogonal to the product conveyance direction in the vicinity of the upper portion of the opening 11a.

  In addition, an interlock 31 into which the insertion portion 18 b formed in the support frame 18 is inserted is provided on the outer wall surface of the shield box 11 on the side where the shield noren 16 is attached.

  The interlock 31 detects that the insertion portion 18b is not inserted into the interlock 31. Furthermore, the interlock 31 also detects that the support frame 18 has not been switched to the second state by the patch lock 18c. Then, based on the detection result, whether to supply power to the X-ray irradiator 13 is determined. Thereby, it is possible to reliably prevent the X-ray irradiator 13 from irradiating X-rays in a state where the shielding noren 16 is not properly attached, and to ensure the safety of the operator.

  The hook portion 32 is formed on the outer wall surface of the shield box 11 on the side where the shield noren unit 50 is attached, and the ring portion 18d of the patch lock 18c is hooked. In addition, the first state and the second state are switched by fixing the patching lock 18c to the hook portion 32.

  Furthermore, in the X-ray foreign substance inspection apparatus 10 of the present embodiment, when the second state shown in FIG. 11C is reached, as shown in FIG. 12, the movement restriction attached to the back side of the patch lock 18c in the support frame 18 The plate 33 moves upward. Thereby, when the support frame 18 tries to move away from the main body side, the movement restricting plate 33 comes into contact with a part of the main body and is locked, and the support frame 18 can be prevented from being detached from the main body side.

[Attaching / detaching shielding noren unit]
In the X-ray foreign matter inspection apparatus 10 of the present embodiment, the shielding nolen unit 50 including the shielding nolen 16, the circular pipe 17, and the support frame 18 is attached in the following procedure.

  That is, first, the left and right protrusions 18a on the side of the support frame 18 constituting the shield noren unit 50 where the insertion portion 18b and the patchon lock 18c are not formed (hereinafter referred to as “back side”) are arranged in the examination room S. The shield noren unit 50 is introduced into the inside of the examination room S along the shaft 19 by being hooked on the two shafts 19 provided inside.

  Then, the projecting portion 18a formed on the side of the support frame 18 constituting the shielding noren unit 50 where the insertion portion 18b and the patchon lock 18c are formed (hereinafter referred to as “front side”) is hooked on the shaft 19. Further, the shield noren unit 50 is introduced to the back of the examination room S. At this time, the shielding noren unit 50 is supported at four points, which are contact portions between the total four protrusions 18 a formed on the rear and front support frames 18 and the shaft 19.

  Further, in the process of introducing the shield noren unit 50 to the back of the examination room S, as shown in FIG. 11A, the insertion portion 18 b formed on the support frame 18 on the near side is replaced with the shield box 11. It inserts in the hole of the interlock 31 attached to the outer wall surface side.

  Then, as shown in FIG. 11 (a), after inserting the insertion portion 18b to the back of the interlock 31 (first state), it is formed on the outer wall surface of the shield box 11 as shown in FIG. 11 (b). The ring portion 18d of the Patchon lock 18c formed on the support frame 18 on the front side is hooked on the hook portion 32 thus formed. Then, as shown in FIG. 11C, the main body side of the patch lock 18c is tilted to fix the support frame 18 to the main body side (second state).

  At this time, in the interlock 31, whether the insertion portion 18b of the support frame 18 is inserted into the hole of the interlock 31, and whether the support frame 18 is fixed by the patch lock 18c is in the second state. Detect whether or not. Then, when the non-insertion of the insertion portion 18b and the non-fixation by the patchon lock 18c are not detected, the power supply to the X-ray irradiator 13 is permitted, and the X-ray foreign substance inspection apparatus 10 becomes operable.

  On the other hand, when the interlock 31 detects that the insertion portion 18b is not inserted or has not shifted to the second state, power supply to the X-ray irradiator 13 is prohibited. Thereby, the danger of the exposure which an operator suffers by X-ray leakage can be avoided, and the safety of the operator can be ensured. Further, in the present embodiment, when the above detection is made in the interlock 31, it is displayed on the monitor 26 that the support frame 18 is not accurately attached at a predetermined location, and the support frame is shown to the operator. The state of 18 attachment defects can be recognized.

In the second state, when the support frame 18 is fixed to the main body side using the Patchon lock 18c, the movement restricting plate 33 formed on the back surface side of the support frame 18 on the near side is moved upward as shown in FIG. Move to.
[Characteristics of this X-ray inspection system]
(1)
In the X-ray foreign substance inspection apparatus 10 according to the present embodiment, a configuration is adopted in which a shielding nole 16 for preventing X-rays from leaking to the outside of the apparatus is suspended from a circular pipe 17 having a hollow structure. .

  As a result, while maintaining the strength for suspending the shielding nolen 16, the shielding nolen 16 has an amount corresponding to the hollow inside of the circular pipe as compared with the configuration in which the shielding nolen is suspended from the conventional round bar. The shielding noren unit 50 including the circular pipe 17 and the support frame 18 can be reduced in weight. Therefore, it is possible to reduce the burden on the operator who attaches / detaches the shield noren unit 50 to / from the main body of the X-ray foreign matter inspection apparatus 10 in order to perform maintenance including cleaning of the inspection room S. Further, since the cross section of the circular pipe 17 is circular, dust, dust and the like are less likely to accumulate on the circular pipe 17 during inspection compared to a pipe having a quadrangular cross section, so that the cleaning performance can be improved. Therefore, for example, the present invention can be applied to an apparatus for inspecting products such as foods that need to keep the inside of the inspection room S clean at all times.

(2)
In the X-ray foreign matter inspection apparatus 10 of the present embodiment, the upper end portion of the shielding nolen 16 is wound around a circular pipe 17 that suspends the shielding nolen 16.

  As a result, a state in which the shield noren 16 is overlapped in the circular pipe 17 can be formed. For this reason, since the inside is hollow, the shielding ability of the circular pipe 17 portion where the shielding ability of X-rays is lowered can be improved. Therefore, the fall of the shielding capability at the time of using the lightweight circular pipe 17 can be prevented, and operator safety can be ensured.

(3)
In the X-ray foreign substance inspection apparatus 10 of the present embodiment, a shaft 19 provided in the examination room S for inserting the support frame 18 supporting the circular pipe 17 from which the shielding noren 16 is suspended to the back of the examination room S. Has a circular cross section.

  Thereby, even when the shaft 19 is fixedly mounted in the examination room S, it is possible to suppress the accumulation of dust or the like on the shaft 19 and improve the cleaning property in the examination room S. it can.

(4)
In the X-ray foreign matter inspection apparatus 10 of the present embodiment, an interlock 31 provided as a safety device is attached to the outside of the examination room S as shown in FIGS.

  As a result, as compared with the conventional X-ray foreign substance inspection apparatus that inserts an insertion portion into an interlock attached to the inside of the examination room S and detects the attachment / detachment state of the shield noren, the back of the examination room S is bent. Since it is possible to easily confirm whether or not the insertion portion 18b of the support frame 18 is inserted into the interlock 31 without looking into the interior, the burden on the operator can be reduced. Moreover, the unnecessary unevenness | corrugation inside the test | inspection room S can be eliminated, and cleaning property can be improved. Moreover, since the interlock 31 is outside the examination room S, it is possible to reduce the probability of occurrence of a malfunction such as damage to the interlock 31 when the examination room S is cleaned.

(5)
In the X-ray foreign matter inspection apparatus 10 of this embodiment, the interlock 31 detects both that the insertion portion 18b is not inserted and that the patch lock 18c is not stopped.

  Thereby, not only the presence / absence of insertion of the insertion portion 18b of the support frame 18 but also detection of the switching between the first state and the second state by the patched lock 18c shown in FIGS. 11 (a) to 11 (c). Thus, the X-ray irradiator 13 is prevented from being irradiated with X-rays in the first state in which the support frame 18 to which the shielding noren 16 is attached may be detached from the main body. Sex can be secured.

(6)
In the X-ray foreign substance inspection apparatus 10 of this embodiment, when the patch lock 18c shown in FIG. 11C is stopped and the second state is established, the support frame 18 is prevented from being detached from the main body side. A movement restricting plate 33 for restricting movement is provided (see FIG. 12).

  As a result, in the second state in which the X-ray irradiator 13 is allowed to irradiate X-rays, a double lock is applied together with the patch lock 18c so that the support frame 18 does not come off from the main body, thereby enabling more workers. Can be secured.

(7)
In the X-ray foreign substance inspection apparatus 10 of the present embodiment, the interlock 31 detects not only whether or not the insertion portion 18b of the support frame 18 is inserted, but also the switching between the first state and the second state by the patch lock 18c. .

  Thus, by detecting the two states with one member, the number of parts can be reduced and the cost can be reduced compared to using separate detection means.

(8)
In the X-ray foreign substance inspection apparatus 10 of the present embodiment, the detection result in the interlock 31 is displayed on the monitor 26.

Accordingly, the operator can recognize that the support frame 18 that supports the circular pipe 17 from which the shielding noren 16 is suspended is removed from the main body by the display on the monitor 26. Can be increased.
[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the said embodiment, the detection of the attachment state of the support frame 18 was given and demonstrated using the interlock 31 as an example. However, the present invention is not limited to this, and a detection device other than the interlock may be used as the first detection device. The same applies to the second detection device.

(B)
In the above embodiment, the interlock 31 has the insertion portion 18b of the support frame 18 not inserted (first detection device) and the patchon lock 18c of the support frame 18 has not been stopped (second detection device). ) And an example used as a detection device for detecting both. However, the present invention is not limited to this. For example, the interlock 31 may be used only as the first detection device, and another device may be provided as the second detection device. Furthermore, the patch lock 18c may be integrated with an interlock function.

(C)
In the above-described embodiment, an example in which the first state and the second state are switched using the Patchon lock 18c has been described. However, the present invention is not limited to this. For example, the support frame 18 is prevented from being detached from the main body side by pressing the support frame 18 with the door of the shield box 11 that is opened and closed when the shield noren unit 50 is attached / detached, and switching between the first state and the second state is performed. You may go.

(D)
In the said embodiment, the example which uses X-ray as a radiation irradiated with respect to the goods G was given and demonstrated. However, the present invention is not limited to this. For example, other radiation such as β rays, γ rays, electromagnetic waves, and the like may be used.

  According to the radiation inspection apparatus of the present invention, it is possible to reduce the burden on the worker who attaches and detaches the leakage prevention curtain during cleaning or maintenance of the inspection room. The present invention can be widely applied to radiation inspection apparatuses that handle inspected objects.

1 is an external perspective view of an X-ray foreign matter inspection apparatus according to an embodiment of the present invention. The simple block diagram inside the shield box of a X-ray foreign material inspection apparatus. The schematic diagram which shows the principle of a X-ray foreign material inspection. The figure which shows the structure before and behind an X-ray foreign material inspection apparatus. The block block diagram of a control computer. The top view which shows the structure inside the X-ray foreign material inspection apparatus of FIG. The front view which shows the structure inside the X-ray foreign material inspection apparatus of FIG. The side view which shows the structure inside the X-ray foreign material inspection apparatus of FIG. The enlarged view of A part of FIG. The perspective view which shows a shielding noren unit. (A)-(c) is a perspective view which shows a part of attachment procedure of a shielding noren unit. Sectional drawing which shows a motion of the movement control board at the time of attaching a support frame.

10 X-ray foreign matter inspection equipment (radiation inspection equipment)
11 Shield box 11a Opening 12 Conveyor 13 X-ray irradiator (X-ray source)
14 X-ray line sensor 14a Pixel 15 Photoelectric sensor 16 Screening noren (leak prevention curtain)
17 Circular pipe (hanging member)
18 Support frame (curtain support)
18a Protruding part 18b Inserting part 18c Patchon lock (switching mechanism)
19 Shaft (support member)
20 control computer 21 CPU
22 ROM
23 RAM
24 FDD
25 HDD (hard disk)
25a Threshold file 26 Monitor (display device)
31 interlock (first detection means, second detection means)
32 Hook (switching mechanism)
33 Movement restriction plate (movement restriction mechanism)
50 Shielding Noren Unit G Product S Inspection room (Inspection space)

Claims (8)

A main body having an opening for carrying in and / or carrying out the object to be inspected, and an inspection room for applying radiation to the object to be inspected,
A leakage prevention curtain that suppresses leakage of radiation from the opening to the outside of the examination room;
A curtain support that has a suspension member that suspends the leakage prevention curtain and is detachable from the main body,
With
The suspension member is a circular pipe,
A switching mechanism that switches between a first state in which the curtain support is removable from the main body and a second state in which the curtain support is not removable from the main body;
A movement restriction mechanism that is provided separately from the switching mechanism and restricts the curtain support body from moving in the removal direction with respect to the main body;
Further comprising
Radiation inspection equipment. A support member fixed to the main body and supporting the curtain support body by introducing the curtain support member in the vicinity of the opening in the examination room;
The support member has a circular outer cross-sectional shape,
The radiation inspection apparatus according to claim 1. A main body having an opening for carrying in and / or carrying out the object to be inspected, and an inspection room for applying radiation to the object to be inspected,
A leakage prevention curtain that suppresses leakage of radiation from the opening to the outside of the examination room;
A curtain support that has a suspension member that suspends the leakage prevention curtain and is detachable from the main body,
A first detector for detecting that the curtain support is not attached to the body;
With
The first detection device is disposed outside the examination room,
A switching mechanism that switches between a first state in which the curtain support is removable from the main body and a second state in which the curtain support is not removable from the main body;
A movement restriction mechanism that is provided separately from the switching mechanism and restricts the curtain support body from moving in the removal direction with respect to the main body;
Further comprising
Radiation inspection equipment. Further comprising a second detection equipment for detecting that before SL is the first state,
The radiation inspection apparatus according to claim 3. The second detection device also serves as the first detection device;
The radiation inspection apparatus according to claim 4. A display device for displaying that the curtain support is removed when the detection device detects that the curtain support is removed from the main body;
The radiation inspection apparatus according to claim 3. The upper part of the leakage prevention curtain overlaps the suspension member in the height direction.
The radiation inspection apparatus according to any one of claims 1 to 6. The upper part of the leakage prevention curtain is wound around the suspension member,
The radiation inspection apparatus according to claim 7.

Images