KR102405697B1 - Radiation detection instrument for non-destructive inspection - Google Patents

Abstract

The present invention relates to a one-way X-ray cargo detector, comprising: a conveyor 20 for transporting a seated cargo (P) as supported on a frame assembly (10) supported on the ground; a search tunnel 30 supported by the frame assembly 10 and surrounding the conveyor 20, through which the cargo P transported by the conveyor 20 passes; a generator 40 supported under the frame assembly 10 and irradiating X-rays (X) with the cargo (P) transported on the conveyor 20; a collimator 50 for diffusing the X-rays X irradiated from the generator 40 in a sectoral shape; and a detection box 80 in which a plurality of detector modules 81 for detecting X-rays X that have passed through the cargo P as installed in the search tunnel 30 opposite the generator 40 are built-in; characterized by including.

Description

One-way X-ray cargo detector {Radiation detection instrument for non-destructive inspection}

The present invention relates to an X-ray cargo searcher that searches for cargo using X-rays, and more particularly, to a one-way X-ray cargo searcher capable of obtaining a clear X-ray image and enabling easy maintenance at the same time.

In general, X-ray cargo detectors are operated at airports, ports, and ports to search for explosives, toxic and prohibited items in cargo entering and leaving the country. Freight search machines are being operated not only in public institutions, but also in public places where many people are active, or in courier companies that handle a lot of cargo (goods).

The cargo detector basically includes a generator that irradiates X-rays, a plurality of detector modules installed opposite the generator and arranged in a line to detect the irradiated X-rays, and cargo between the generator and the detector module. It consists of a conveyor for transporting and a display that converts X-rays detected by a plurality of detector modules into images and outputs them.

With this configuration, the X-rays irradiated from the generator are detected by a plurality of detector modules after passing through the transported cargo, and the X-ray signals detected by the detector modules are converted into images and projected on the display, and the manager Check to see if any illegal items are included.

On the other hand, since the X-ray cargo detector searches countless cargoes every day, vibrations are continuously transmitted during the operation process, and these vibrations cause the generator or detector modules arranged in a line to be shifted. In this case, the relative initial positions between the generator and the plurality of detector modules were changed, so that the X-rays irradiated from the generator were not accurately irradiated between the detector modules, which caused distortion of the X-ray images, so that an accurate X-ray image could not be obtained. For this reason, the manager had to calibrate the position of the generator or detector module regularly or irregularly.

However, since the cargo detector has a structure filled with numerous parts in a narrow space, it was necessary to disassemble a significant part of the unidirectional X-ray cargo detector in order to correct the relative position between the generator and the detector module. After calibration, a complicated process such as reassembling the cargo detector was required, and there were many difficulties in maintenance.

The present invention was created to solve the above problems, and when the relative position between the X-rays irradiated from the generator and the detector module is misaligned and distortion of the X-ray image occurs in the process of long-term operation, the relative position between the X-ray and the detector module An object of the present invention is to provide a one-way X-ray cargo detector that can be easily calibrated.

Another object of the present invention is to provide a one-way X-ray cargo detector that can clearly implement an image by an X-ray that has passed through the cargo.

In order to achieve the above object, the one-way X-ray cargo detector according to the present invention includes a conveyor 20 for transporting the seated cargo (P) as supported on the frame assembly 10 supported on the ground; a search tunnel 30 supported by the frame assembly 10 to surround the conveyor 20 and through which the cargo P transported by the conveyor 20 passes; a generator 40 supported under the frame assembly 10 and irradiating X-rays (X) with the cargo (P) transported on the conveyor 20; a collimator 50 for diffusing the X-rays X irradiated from the generator 40 in a sectoral shape; and a detection box 80 for detecting X-rays X that have passed through the cargo P, wherein the detection box 80 includes an upper surface and a right side surface of the tunnel housing 31 opposite the generator 40 An L body 82 in close contact with a plurality of detector modules 81, a detection box slit 83 formed in vertical and horizontal directions on the inner bottom of the L body 82, and the L body 82 A window 84 for exposing the plurality of detector modules 81 as formed in the outer horizontal and vertical directions, and a window cover for selectively opening and closing the window 84 for maintenance of the detector module 81 ( 85).

In the present invention, the detection box 80 is installed on both sides of the L body 82 and further includes a plurality of brackets 86 for fixing the L body 82 to the outside of the tunnel housing 31. .

In the present invention, the generator 40 includes a main body 41 having an oblique inclined surface 41a formed on the upper side and a light source 42 irradiating X-rays (X) therein, and the inclined surface 41a. An X-ray transmission window 43 formed in the, a ring guider 44 installed on the inclined surface 41a so that the X-ray transmission window 43 is embedded, and a plurality of ring guider fastening holes formed in the ring guider 44 ( 45).

In the present invention, the collimator 50 is installed to extend forward of the cap bracket 53 coupled to the ring guider 44 and the cap bracket 53 and communicates with the X-ray transmission window 43 . The ring as formed on the edge side of the expansion box 54, which is expanded in a fan shape toward the front side, the top plate 55 in the form of a rim installed at the end of the expansion box 54, and the cap bracket 53 It includes a circumferential through-hole 56 through which a bolt (not shown) fastened to the guider fastening hole 45 passes.

In the present invention, the slit stop 60 is installed at the front end of the collimator 50 to form a transmission slit (S) for transmitting the X-rays (X) in a line form; further includes.

In the present invention, a shielding bracket 70 for connecting the collimator 50 and the lower side of the search tunnel 30 and shielding the X-rays (X) from leaking to the outside at the same time; further includes.

According to the present invention, by employing the collimator 50 and the shielding bracket 70 installed between the generator 40 and the search tunnel 30, the generator is generated by vibration applied during long-term operation and temperature change of the surrounding environment. When the initial position between (40) and the detection box (80) is shifted, or when maintenance is required due to deterioration of parts, the generator (40) is removed by separating the collimator (50) and the shielding bracket (70). It is possible to secure a space for maintenance, and accordingly, smooth maintenance is possible on a regular or irregular basis.

In addition, the collimator 50 can rotate at a predetermined angle in the left and right direction with respect to the generator 40, and the slit iris 60 is installed in the collimator 50 as one body, so that the X-ray (X) passing through the transmission slit (S) ) can correct the slit width or correct the angle irradiated with the detection box 80, and thus a clear X-ray image can be obtained from the X-ray (X) detected in the detection box 80 after passing through the cargo P Therefore, it is possible to more effectively search for illegal items included in the cargo (P).

1 is a perspective view of a one-way X-ray cargo detector according to the present invention;
Figure 2 is a perspective view for explaining the internal structure of the one-way X-ray cargo detector of Figure 1;
3 is a perspective view showing the generator, collimator and slit stop assembly of FIG. 2 taken out;
4 is an exploded side view of the generator, collimator and slit stop of FIG. 3;
5 is a perspective view for explaining the configuration by extracting the generator of FIG. 4;
Figure 6 is a perspective view for explaining the structure by extracting the collimator of Figure 4;
7 is a cross-sectional view taken along line VII-VII' of FIG.
8 is a view for explaining the configuration of the slit aperture of FIG. 3;
9 is a view for explaining a shielding bracket connecting the collimator of FIG. 2 and the lower side of the tunnel housing;
10 is a cross-sectional view for explaining a detection box coupled to the tunnel housing of FIG. 2;
11 is a perspective view of the detection box of FIG. 10;
12 is a view for explaining that a window is formed on the L body of FIG. 11;
13 is a view for explaining that X-rays irradiated from the generator, collimator and slit iris assembly of FIG. 2 are irradiated to a detection box;

Hereinafter, a one-way X-ray cargo detector according to the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, what is described as "upper" or "upper" may include not only directly on in contact but also on non-contacting. Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. The singular expression includes the plural expression unless the context clearly dictates otherwise. Also, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, terms such as "...unit" and "module" described in the specification mean a unit that processes at least one function or operation. In addition, in the drawings, the size of the components may be exaggerated or reduced for convenience of description. For example, since the size and thickness of each component shown in the drawings are arbitrarily indicated for convenience of description, the present invention is not necessarily limited to the illustrated bar.

Figure 1 is a perspective view of a one-way X-ray cargo screening machine according to the present invention, Figure 2 is a perspective view for explaining the internal structure of the one-way X-ray cargo screening machine of FIG.

As shown, the unidirectional X-ray cargo detector according to the present invention includes: a conveyor 20 for transporting the seated cargo (P) as supported on the frame assembly 10 supported on the ground; A search tunnel 30 supported by the frame assembly 10 to surround the conveyor 20 and through which the cargo P transported by the conveyor 20 passes; A generator 40 for irradiating X-rays (X) to the cargo (P) transported on the conveyor 20 as supported under the frame assembly 10; a collimator 50 for diffusing the X-rays X irradiated from the generator 40 in a sectoral shape; a slit stop 60 installed at the tip of the collimator 50 to form a transmission slit S for transmitting the X-rays X in a line form; a shielding bracket 70 for connecting the collimator 50 and the lower side of the search tunnel 30 and shielding the X-rays (X) from leaking to the outside; A detection box 80 in which a plurality of detector modules 81 for detecting X-rays (X) that have passed through the cargo (P) for search as installed in the search tunnel 30 opposite the generator 40 are built-in; including; characterized in that

The conveyor 20 and the search tunnel 30 are supported on the upper portion of the frame assembly 10 , and the generator 40 is supported on the lower side of the frame assembly 10 .

The conveyor 20 includes a conveying belt wound on a rotating roller and conveyed on an endless track in one direction, and the cargo P seated on the conveying belt slowly passes through the search tunnel 30 .

As shown in FIG. 2, the search tunnel 30 is installed to surround a part of the conveyor 20 in the frame assembly 10, and a tunnel housing 31 supporting the detection box 80, and a tunnel As installed on the front and rear sides of the housing 31 , the first and second transparent housings 32 and 33 for checking the article P entering or leaving the tunnel housing 31 are included. And at the entrance and exit of the tunnel housing 31, the first and second having a radiation shielding function so that the X-rays (X) irradiated into the tunnel housing 31 do not leak to the first and second transparent housings 32 and 33 side. Lead curtains 34 and 35 are installed.

3 is a perspective view showing an assembly of the generator, collimator and slit iris of FIG. 2 is extracted, FIG. 4 is an exploded side view of the generator, collimator and slit iris of FIG. 3, and FIG. 5 is configured by extracting the generator of FIG. 6 is a perspective view for explaining the structure by extracting the collimator of FIG. 4 , and FIG. 7 is a cross-sectional view taken along line VII-VII' of FIG. 7 .

The generator 40, as shown in FIG. 2, is supported on the lower side of the frame assembly 10 and irradiates X-rays (X) to the corner side of the opposite search tunnel 30, in this process, the X-rays (X) is transmitted through the cargo (P) transported on the conveyor (20). As shown in FIG. 6, the generator 40 has a body 41 having a slanted inclined surface 41a formed on the upper side and a light source 42 irradiating X-rays (X) therein, a built-in body 41, and an inclined surface ( The X-ray transmission window 43 formed in 41a), the ring guider 44 installed on the inclined surface 41a so that the X-ray transmission window 43 is embedded, and a plurality of ring guider fastening holes 45 formed in the ring guider 44 ) is included.

The light source 42 built into the body 41 may be implemented as, for example, an X-ray tube in the form of an electron beam accelerator, or may be a radioactive material that generates radiation.

The ring guider 44 supports the collimator 50 to be rotated at a predetermined angle in the left and right direction with respect to the inclined surface 41a.

The collimator 50 spreads the X-rays X irradiated from the generator 40 in a sectoral shape, and as shown in FIGS. 6 and 7 , the cap coupled to the ring guider 44 of the generator 40 . The bracket 53 and the cap bracket 53 are installed to extend forward, communicate with the X-ray transmission window 43 and expand in a fan shape toward the front side, and are installed at the end of the expansion box 54 The top plate 55 in the form of a rim and a circumferential through hole through which a bolt (not shown) fastened to the ring guider fastening hole 45 of the ring guider 44 as formed on the edge side of the cap bracket 53 penetrates ( 56), a plurality of fastening through-holes 57 formed in the top plate 55 and through which a bolt (not shown) fastened to the shielding bracket 70 passes, and a plurality of tops formed between the fastening through-holes 57 It includes a plate screw hole (58).

The cap bracket 53 has a circular cap shape to be inserted into the ring guider 44 , and is rotatable while being fitted in the ring guider 44 .

The expansion box 54 forms a through path having a fan-shaped shape that is flat and widens to the front side, and the entrance side faces the X-ray transmission window 43 . Therefore, the X-ray (X) passing through the X-ray transmission window 43 is irradiated to be diffused throughout the detection box 80 along the angle allowed by the expansion box 54 . This school building box 54 is shielded with lead so that the passing X-rays do not leak to the outside.

The top plate 55 has a rim shape as a whole so as to expose the exit of the expansion box 54 , and becomes a space in which a slit stop 60 to be described later is installed.

The circumferential through-hole 56 is formed on the edge side of the cap bracket 53 and a bolt (not shown) fastened to the ring guider fastening hole 45 passes through, and accordingly, the cap bracket 53 is connected to the ring guider 44. It is not separated from the generator 40 when it is rotated at a predetermined angle in the left and right direction.

A lead shielding wall is formed on the inner wall of the collimator 50 , and accordingly, the X-rays X passing through the collimator 50 are shielded so that they do not leak to the outside.

8 is a view for explaining the configuration of the slit stop of FIG.

The slit stop 60 is installed at the tip of the collimator 50 to form a transmission slit S through which the X-rays X pass, and moves in the left and right directions on the left side of the top plate 55 of the collimator 50 . The left-side variable-position wing 61 arranged operably, the left-side shielding plate 62 installed on the upper part of the left-side variable-positioning blade 61 , and the right side arranged to be movable in the left and right direction on the right side of the top plate 55 . Position variable wings (63) and,

The right shielding plate 64 which is installed on the upper part of the right-position variable blade 63 to form the left-side shielding plate 62 and the transmission slit S, and the left-side top plate as formed on the left-hand variable blade 61 or A plurality of left fastening holes 65 through which the bolts B1 fastened to the screw holes 58 are penetrated and the bolts (not shown) formed in the right-side variable wing 63 are fastened to the right top plate screw hole 58 . ) through a plurality of right fastening holes 66 and the bolts (not shown) that are formed in the left variable wing 61 and are fastened to the shielding bracket 70 through the fastening through holes 57 on the left side. A plurality of left through-holes 67, which are formed in the right-side variable wing 63, and through which a bolt (not shown) fastened to the shielding bracket 70 passes through the fastening through-hole 57 on the right side. It includes a right through long hole (68).

The width of the transmission slit (S) formed between the left shielding plate 62 and the right shielding plate 64 can be corrected by moving the left variable blade 61 and the right variable blade 63 to the left and right. The transmission slit (S) can shield the partially scattered X-ray lines located on the left and right with respect to the center line among the X-rays (X) that have passed through the cargo (P), and furthermore, to transmit only the minimum dose required for detection. A detection box 80 to be described later enables a high-quality and clear X-ray image to be implemented.

If, since the transmission slit (S) is not employed, when the transmitted X-rays (X) have a dose higher than necessary, the X-rays (X) have excessive energy and pass through various structures constituting the cargo (P) as they are, In this case, in the X-ray image obtained from the detection box 80, the internal structure of the cargo P is not clearly expressed.

In addition, the relative position between the collimator 50 and the detection box 80 may be slightly shifted due to vibration transmitted through the conveyor 20 or a change in ambient temperature in the process of operating the cargo detector, and in this case, the transmission slit ( X-rays (X) passing through S) may not be irradiated to the detection box slit 83 of the detection box 80 or may be partially shielded. In this case, the width of the transmission slit (S) as well as the overall position can be minutely varied by moving the left and right variable blades 51 and 53 to the left and right, and accordingly, the generator 40 or detection Correction is possible without changing the position of the box 80, so that easy maintenance is possible.

On the other hand, the slit iris 60 is assembled to the top plate 55 of the collimator 50 as one body, whereby the transmission slit (S) formed in the slit iris 60 is rotated at a predetermined angle in the left and right direction based on the generator 40 can do it Accordingly, in the process of installing the X-ray detector of the present invention, even if the detection box 80 is slightly shifted from the set position, by rotating the collimator 50 in a specific direction, the transmission slit S is detected with the detection box slit 83 and They can be exactly opposite each other, and thus easier setting is possible.

9 is a view for explaining a shielding bracket connecting the collimator of FIG. 2 and the lower side of the tunnel housing.

The shielding bracket 70 is installed on one side of the tunnel housing 31 of the search tunnel 30 , and connects the collimator 50 and the lower side of the search tunnel 30 . The shielding bracket 70 becomes a medium connecting the collimator 50 and the tunnel housing 31, and shields the X-rays (X) passing through the collimator 50 from leaking to the outside. A wall is formed.

By adopting such a shielding bracket 70, when you want to perform maintenance such as replacing the light source 42 or related parts in the generator 40, remove the shielding bracket 70 and then install the collimator 50 sequentially. By separating, a space for maintaining the generator 40 can be secured. Accordingly, maintenance is possible without removing the generator 40, so that regular or irregular maintenance can be smoothly performed.

10 is a cross-sectional view for explaining a detection box coupled to the tunnel housing of FIG. 2 , FIG. 11 is a perspective view of the detection box of FIG. 10 , and FIG. 12 is a view for explaining that a window is formed in the L body of FIG. 11 .

The detection box 80 is installed in the search tunnel 30 opposite the generator 40 to detect the X-rays X irradiated from the generator 40 . The detection box 80 is in close contact with the upper surface and one side of the tunnel housing 31 opposite the generator 40, and the L body 82 in which a plurality of detector modules 81 are embedded, and the L body 82. A detection box slit 83 formed in the vertical and horizontal directions on the inner bottom of the, and a window 84 that is formed in the horizontal and vertical directions on the outside of the L body 82 and exposes a plurality of detector modules 81, and the detector module A window cover 85 that selectively opens and closes the window 84 for maintenance of 81, and is installed on both sides of the L body 82 to fix the L body 82 to the outside of the tunnel housing 31 It includes a number of brackets (86).

The detector module 81 is installed in the L body 82 in the horizontal and vertical directions to detect the X-rays X irradiated through the detection box slit 83 to form a continuous scanning frame. That is, the plurality of detector modules 81 detect the X-rays X that have passed through the cargo P to generate continuous scanning frames, and then the continuously generated scanning frames are combined in time series to obtain a two-dimensional transmission image. is to create

The detection box slit 83 is formed on the inside of the L body 82 in vertical and horizontal directions, and forms a straight line as a whole. The detection box slit 83 has a width of 3 mm, and guides the X-rays X passing through the transmission slit S to the plurality of detector modules 81 .

The window cover 85 selectively opens the window 84 for maintenance of the detector module 81 . Due to the window 84 and the window cover 85, there is no need to separate or assemble the detection box 80 from the search tunnel 30 in order to maintain the detector module 81, and thus easy maintenance it becomes possible

Since the detection box 80 is installed in close contact with the upper surface and one side of the tunnel housing 31, the body 82 is exposed to the outside. Accordingly, the window cover 85 is opened to open the window 84. Through this, it is possible to maintain the first detector module 81 and related parts, and accordingly, it is not necessary to separate the detection box 80 from the search tunnel 30, so that easy maintenance is possible.

13 is a view for explaining that X-rays irradiated from the assembly of the generator, collimator and slit iris of FIG. 2 are irradiated to the detection box.

The generator 40, the collimator 50 and the slit iris 60 form an assembly of one body, and the X-rays (X) diffusely irradiated from them transmit the cargo (P) transferred by the conveyor 20 from one side. After being irradiated to the detector modules 81 installed in a line through the detection box slit 83, the X-rays detected by the plurality of detector modules 81 are converted into images and displayed through a display (not shown).

As described above, according to the present invention, by employing the collimator 50 and the shielding bracket 70 installed between the generator 40 and the search tunnel 30, the vibration applied in the process of long-term operation and the temperature change of the surrounding environment When the initial position between the generator 40 and the detection box 80 is shifted by the 40) can be secured, and accordingly, smooth maintenance is possible on a regular or irregular basis.

In addition, the collimator 50 can rotate at a predetermined angle in the left and right direction with respect to the generator 40, and the slit iris 60 is installed in the collimator 50 as one body, so that the X-ray (X) passing through the transmission slit (S) ) can correct the slit width or correct the angle irradiated with the detection box 80, and thus a clear X-ray image can be obtained from the X-ray (X) detected in the detection box 80 after passing through the cargo P Therefore, it is possible to more effectively search for illegal items included in the cargo (P).

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

10 ... frame assembly 11 ... main frame
12 ... subframe 20 ... conveyor
30 ... search tunnel 31 ... tunnel housing
32, 33 ... 1st and 2nd transparent housing 34, 35 ... 1st and 2nd lead curtain
40 ... generator 41 ... body
41a ... slope 42 ... light source
43 ... X-ray transmission window 44 ... Ring guider
45 ... Ring guider fastening hole 50 ... Collimator
53 ... Cap bracket 54 ... Expansion box
55 ... Top plate 56 ... Through hole
57 ... Fastening through hole 58 ... Top plate screw hole
60 ... slit aperture 61 ... variable left position wing
62 ... Left shield plate 63 ... Right-position variable wing
64 ... right shield plate 65 ... left fastening hole
66 ... Right fastening hole 67 ... Left through long hole
68 ... Long hole through right 70 ... Shelding bracket
80 ... detection box 81 ... detector module
82 ... L body 83 ... detection box slit
84 ... Windows 85 ... Window Cover
86 ... bracket

Claims (6)

Conveyor 20 for transporting the cargo (P) seated as being supported on the frame assembly 10 supported on the ground;
a search tunnel 30 supported by the frame assembly 10 to surround the conveyor 20 and through which the cargo P transported by the conveyor 20 passes;
a generator 40 supported on the lower portion of the frame assembly 10 and irradiating X-rays (X) to the cargo (P) transported on the conveyor 20;
a collimator 50 for diffusing the X-rays X irradiated from the generator 40 in a sectoral shape; and
A detection box 80 for detecting X-rays (X) that have passed through the cargo (P);
The detection box 80 is in close contact with the upper and right surfaces of the tunnel housing 31 opposite the generator 40 and has an L body 82 in which a plurality of detector modules 81 are built in, and the L body 82. A detection box slit 83 formed in the vertical and horizontal directions on the inner bottom of the, and a window 84 formed in the horizontal and vertical directions outside the L body 82 and exposing the plurality of detector modules 81; a window cover 85 for selectively opening and closing the window 84 for maintenance of the detector module 81;
The generator 40 has a main body 41 having an oblique inclined surface 41a formed on the upper side and a light source 42 irradiating X-rays (X) therein, and an X-ray transmission window formed on the inclined surface 41a. (43), and a ring guider 44 installed on the inclined surface 41a so that the X-ray transmission window 43 is embedded, and a plurality of ring guider fastening holes 45 formed in the ring guider 44. Characterized in that, one-way X-ray cargo detector. According to claim 1, wherein the detection box (80),
One-way X-ray cargo detector, which is installed on both sides of the L body (82) and further comprises a plurality of brackets (86) for fixing the L body (82) to the outside of the tunnel housing (31). delete According to claim 1, The collimator (50),
a cap bracket 53 coupled to the ring guider 44;
An expansion box 54 which is installed to extend forward of the cap bracket 53 and communicates with the X-ray transmission window 43 and expands in a fan shape toward the front side;
A top plate 55 in the form of a rim installed at the end of the expansion box 54,
A one-way X-ray cargo detector, which is formed on the edge of the cap bracket (53) and includes a circumferential through hole (56) through which a bolt (not shown) fastened to the ring guider fastening hole (45) passes. The method of claim 1,
A slit stop (60) installed at the tip of the collimator (50) to form a transmission slit (S) for transmitting the X-rays (X) in a line form; The method of claim 1,
One-way X-ray cargo, characterized in that it further comprises; a shielding bracket 70 that connects the collimator 50 and the lower side of the search tunnel 30 and at the same time shields the X-ray (X) from leaking to the outside. Finder.

Images