JP4442626B2 - X-ray frame - Google Patents

Description

  The present invention relates to an X-ray imaging gantry for mounting a cylindrical test object such as a shell and determining the internal structure by X-ray imaging the test object.

  In recent years, X-ray photographs obtained by X-ray photography and processing of X-rays by digging a test object such as a shell buried in the ground safely, irradiating the test object with X-rays using an X-ray identification device, etc. Research and development have been conducted on techniques for discriminating internal structures from later images. The specimens whose internal structure has been identified and whose type has been confirmed are individually processed safely, disassembled, and then discarded.

  An X-ray imaging base on which the test object is placed is used when X-ray imaging of the test object. A conventional X-ray imaging base 81 as shown in FIG. 8A is made of metal, and is formed in an orthogonal mesh shape so as to have a V-shaped groove.

  However, when X-rays are irradiated onto the X-ray imaging frame 81 from the lateral direction, only the rib portion r of the X-ray imaging frame 81 increases the amount of X-ray attenuation, and FIG. A vertical shadow s shown in FIG. This vertical shadow s may overlap the end of the charge transfer cylinder or the glaze cylinder 82, which may reduce the appraisal accuracy of the test object x8 or cause erroneous recognition.

Japanese Utility Model Publication No. 6-69826 Japanese Patent Laid-Open No. 11-299770

In order to solve the above-mentioned problem and to reliably determine the internal structure of the specimen x8, as a conventional X-ray imaging base,
(A) The gantry body is formed of a resin block, and the resin block is processed into a V-shaped groove. (B) The gantry body is formed of a resin plate, and the resin plate is processed into an orthogonal grid. ing.

  However, conventional X-ray imaging stands such as (a) and (b) use a resin having a density of about 1/8 compared to metal, but structurally transparent for the purpose of improving strength. Since there is a part where the thickness is increased, the gantry is reflected in the image, and it is not possible to determine whether the signal is noise or image signal.

  In other words, not the performance of the X-ray appraisal apparatus but the problem that the gantry, which is a jig, has a great influence on the radiography of the X-ray appraisal apparatus, and it is necessary to reduce the influence of the reflection of the gantry. there were.

  On the site, it was necessary to optimize the gantry according to the shape and state of the test object.

  Accordingly, an object of the present invention is to provide an X-ray imaging gantry in which the reflection of the gantry on the image is reduced.

The present invention has been made in order to achieve the above object, the invention of claim 1, the upper surface of the frame body, V grooves of order placing the tubular test object consisting of bullet and dropped type bombs In the X-ray imaging gantry for irradiating the specimen on the V-groove horizontally with X-rays from the side and X-raying the specimen to determine the internal structure, the gantry body is , the irradiation direction of each of the resin plates each resin plate X-ray at the time of placement to X-ray imaging obliquely to the extension direction of the V-groove with upstanding resin plate to form a grid body crossed This is an X-ray imaging stand that is inclined .

The invention of claim 2, the upper Symbol gantry main body, an X-ray imaging gantry of claim 1, wherein the formation of a foam consisting of foamed plastic.

According to a third aspect of the present invention, in the grid according to the first or second aspect , the lattice body is formed in a shape in which the height of one end and the other end in the longitudinal direction is different , and the test object is inclined and placed. It is a stand for X-ray photography.

The invention according to claim 4 is the structure according to any one of claims 1 to 3, wherein the base body is formed by placing the lattice body on an inclined tray having different heights at one end and the other end in the longitudinal direction. X-ray imaging stand.

According to a fifth aspect of the present invention, there is provided an X-ray imaging gantry according to any one of the first, third, and fourth aspects, wherein the lattice body is formed with a storage groove for storing a protruding piece protruding from the outer periphery of the test object. It is.

  According to the present invention, reflection of a pedestal on an image is reduced, and image discrimination accuracy can be improved.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.

  FIG. 1A is a plan view of an X-ray imaging gantry showing a preferred first embodiment of the present invention, FIG. 1B is a side view thereof, and FIG. 1C is 1C in FIG. 1C is a sectional view taken along line 1D-1D in FIG. 1A, FIG. 1E is a sectional view taken along line 1E-1E in FIG. 1A, and FIG. FIG. A hatched portion in FIGS. 1C to 1E indicates a cut surface.

  As shown in FIGS. 1 (a) to 1 (f), an X-ray imaging gantry 1 according to the first embodiment is a gantry on which cylindrical test objects (test objects) x1 and x2 are placed. It consists of a main body (plate) 2 and an auxiliary plate 3 on which the gantry main body 2 is placed. The gantry body 2 and the auxiliary plate 3 are made of synthetic resin such as ABS resin.

  In the following description, as an example of the test objects x1 and x2, a shell dug from the ground will be described as an example.

  The test object x1 (the chain double-dashed line in FIG. 1B) is formed in a cylindrical shape so as to be almost teardrop-shaped in a side view, and the protruding piece p protrudes from the outer periphery of the rear end portion. It is formed. Examples of the test object x1 include a drop-type bomb.

  The test object x2 (the chain line in FIG. 1B) is longer, thicker and heavier than the test object x1. The test object x2 is formed in a cylindrical shape as a whole so that the tip end portion is narrowed in a side view. An example of the test object x2 is a shell.

  The maximum outer diameter of a general test object is about 75 to 150 mm. In the following description, an example in which the outer diameter of the specimen x1 is about 75 mm and the outer diameter of the specimen x2 is 150 mm will be described as an example.

  The gantry body 2 is configured by forming a mesh-like convex portion 5 that is a slanted lattice by intersecting a plurality of long resin plates 4 standing vertically from the surface, and the convex portion 5 is formed on the surface of the gantry main body 2. It is formed by the lattice body 6 formed in the above.

  What is necessary is just to form the convex part 5 in the part which overlaps with the test object x1, x2 mounted on the mount main body 2 at least. In the first embodiment, the convex portion 5 in which the resin plates 4 are integrated is formed on almost the entire surface of the gantry body 2.

  The height h of each resin plate 4 is in the range of about 1/4 to 1/2, preferably about 1/4 to 1/3 of the maximum thickness d of the grid body 6. It is preferable that h is low and the height h gradually increases from the center toward both sides. When the height h is less than ¼ of the thickness d, the strength of the resin plate 4 is reduced, and when the height h exceeds ½ of the thickness d, the test objects x1 and x2 are stabilized. It cannot be placed, resulting in increased cost and reflection in the image. In the first embodiment, the thickness d is 30 mm.

  Regarding the width w of each resin plate 4 and the adjacent distance N between the resin plates 4 constituting each eye of the convex portion 5, the cost, strength, reflection in the image, diameters and lengths of the test objects x1 and x2 What is necessary is just to determine suitably according to etc. In the first embodiment, the width w is about 10 mm and the adjacent distance N is about 50 mm.

  The lattice body 6 is formed in a rectangular parallelepiped shape, and a V-groove 7 is formed along the longitudinal direction of the lattice body 6 at the center of the surface thereof.

  The V-groove 7 has, for example, a substantially flat plate shape having a convex portion (a pre-convex portion that is a previous step of the convex portion 5) that is formed of a resin plate having the same height (a pre-resin plate that is a previous step of the resin plate 4). After the block body is formed, the block body may be formed together with the resin plate 4 and the lattice body 6 by performing relief processing such as cutting and removal.

  The length L of the lattice body 6 is slightly longer than the length of a general test object. The length of a general test object is about 400 to 1000 mm. In the first embodiment, L is 650 mm.

  The inclination angle θa with respect to the longitudinal direction of the V-groove surface 7f of each resin plate 4 is preferably 10 to 45 °. In the first embodiment, the inclination angle θa is set to 45 °.

  The lattice body 6 may be collectively formed using an injection molding or resin molding die. Further, the lattice body 6 may be formed together with the auxiliary plate 3 by the same method.

  Next, an example of an X-ray inspection method using the X-ray imaging stand 1 will be described with reference to FIG. Here, the case where the lattice body 6 and the auxiliary plate 3 are separate bodies will be described.

  As shown in FIG. 7, first, the lattice body 6 is placed on the auxiliary plate 3, and the test object x <b> 1 is placed sideways on the V groove 7 of the lattice body 6. Using a picking device or the like, the auxiliary plate 3 and the lattice body 6 are placed on a conveying means 75 such as a belt conveyor with the tip of the test object x1 forward, and the right direction (in FIG. 7, the x direction in FIG. 7). ) And pass through the vicinity of the X-ray irradiation unit 72 of the X-ray identification device 71.

  At this time, the test object x1 is irradiated with the pulsed X-rays 73 generated by the X-ray irradiation unit 72 from the upper direction (-z direction in FIG. 7) and the side surface direction (y direction in FIG. 7). Take a line. The X-ray examination apparatus 71 detects transmitted X-rays with the detection unit 74 and determines the internal structure of the test object x1 from the detected scanned image of transmitted X-rays.

  For example, the test object x1 is provided with a fusible tube 11 such as a transfer cylinder or a glaze cylinder at the tip, and a storage unit 12 for storing a load such as an explosive or a liquid poison at the center. .

  For this reason, the X-ray examination apparatus 71 analyzes the above-described scanning image, and based on the shape and length of the fusible tube 11 and the storage unit 12, and further the shape, length, and outer diameter of the test object x1, the test object The internal structure of x1 is automatically determined.

  Further, the internal structure is discriminated by the X-ray appraisal device 71, the type can be confirmed, and the test object x1 after the appraisal is individually processed safely, disassembled, and then discarded. The test object x2 can be similarly tested.

  The operation of the first embodiment will be described.

  The X-ray imaging gantry 1 includes a mesh-like convex portion 5 that obliquely intersects an upstanding resin plate 4 to form an oblique lattice, and the convex portion 5 is formed on the surface of the gantry body 2. 6, the gantry body 2 is formed.

  For this reason, the X-ray imaging gantry 1 can reduce the X-ray transmission thickness of the gantry main body 2 and reduce the density of the gantry main body 2 while having sufficient strength equivalent to that of the conventional X-ray imaging gantry. That is, the transmission thickness and density of the gantry body 2 in the portion overlapping the test object x1 can be reduced.

  Further, in the X-ray imaging gantry 1, since the convex portions 5 are in a mesh shape with an oblique lattice, each resin plate 4 hardly overlaps the fusible tube 11, so that the accuracy of the appraisal is lowered or a vertical recognition that causes erroneous recognition is caused. Directional shadows do not appear on the scan screen. Even if they overlap, the shadow of each resin plate 4 appearing on the scanning screen is very thin.

  Further, in the X-ray imaging gantry 1, displacement of the test object x 1 can be prevented by each resin plate 4 constituting the convex portion 5, and the test object x 1 can be stably placed on the lattice body 6.

  Therefore, according to the X-ray imaging gantry 1, the reflection of the gantry itself into the image is reduced, and the image discrimination accuracy can be improved.

  A second embodiment will be described.

  As shown in FIGS. 2A to 2C, the X-ray imaging gantry 21 has a resin plate 4 as a diagonal lattice that crosses a plurality of strips diagonally, and one eye is continuously repeated along the longitudinal direction. The gantry body 22 is formed of a lattice body 26 that is formed in such a manner that the chain-like convex portions 25 are connected so as to be parallel to each V groove surface 7 f of the V groove 7. It is formed. Each dimension of the convex part 25 is the same as the convex part 5 of FIG.

  At the rear end portion of each convex portion 25 of the lattice body 26, the projection groove p (see FIG. 1B) of the test object x1 is cut into the storage groove 27 (the hatched portion in FIG. 2A). It is formed by relief processing such as removal.

  The four corners of the lattice body 26 are chamfered to facilitate gripping the lattice body 26 with the above-described picking apparatus.

  In the X-ray imaging gantry 21, the test object x 1 having the protruding piece p can be more stably placed on the lattice body 26 by the storage groove 27 as compared with the X-ray imaging gantry 1 of FIG. .

  A third embodiment will be described.

  As shown in FIG. 3, in addition to the configuration of the X-ray imaging gantry 1 shown in FIG. 1, the X-ray imaging gantry 31 has heights at one end and the other end in the longitudinal direction (direction along the V-groove 7). Are provided with inclined trays 33 having different heights (front and rear heights are different), and the grid body 6 and the auxiliary plate 3 are placed on the inclined trays 33 to form the gantry body 32.

  The upper surface of the inclined tray 33 is an inclined surface 34 that is inclined so that the front is high and the rear is low. The inclination angle θ3 of the inclined surface 34 may be appropriately set according to the outer diameter and weight of the test object. In the third embodiment, the inclination angle θ3 is set to 10 °.

  At the rear end of the inclined surface 34, there is provided a stopper (vertical displacement prevention stopper) 35 that stands from the inclined surface 34 and supports the rear end of the test object x1 from below. On both sides of the rear end portion of the inclined surface 34, positioning members (horizontal shift prevention stoppers) 36b for positioning the rear end portions of the lattice body 6 and the auxiliary plate 3 are provided. Positioning members (horizontal shift prevention stoppers) 36f for positioning the front ends of the lattice body 6 and the auxiliary plate 3 are provided on both sides of the front end of the inclined surface 34, respectively.

  The four corners of the inclined tray 33 are chamfered so as to be easily gripped by the above-described picking device, similarly to the lattice body 26 of FIG.

  In the X-ray imaging gantry 31, the test object x <b> 1 is placed on the inclined tray 33 via the auxiliary plate 3 and the lattice body 6 obliquely. For this reason, if the X-ray imaging base 31 is used, especially when the liquid poison t is stored in the storage unit 12, the liquid level of the poison t on the scanned image is relative to the longitudinal direction of the test object x1. Therefore, the test object x1 and its internal structure can be determined in more detail.

  In the third embodiment, the example using the inclined tray 33 has been described. However, as a modification, the lattice body is formed in a shape with different front and rear heights, and a V groove is formed on the surface thereof. In addition, the test object may be placed on the grid body while being inclined.

  In the above embodiment, the example in which the height h of each resin plate 4 is different along the width direction of the lattice body 6 has been described. However, the transmission thickness and density of the gantry body 2 in the portion overlapping the test object are reduced as compared with the conventional example. As long as it is within the range, the lattice body may be formed by using a resin plate standing up to the same height from the V-groove surface.

A first reference embodiment unrelated to the present invention will be described.

  As shown in FIGS. 4A to 4C, the X-ray imaging gantry 41 includes a gantry body 42 and a thin plate-like auxiliary plate 43. The gantry body 42 is entirely made of foamed plastic. It is formed of a body (a table or a substantially solid body) 46. The foam body 46 is formed in the shape of a rectangular parallelepiped like each lattice body described above, and the V-groove 7 is formed on the surface thereof. The auxiliary plate 43 is made of ABS resin, like the auxiliary plate 3 of FIG.

In the first reference embodiment , the entire gantry body 42 is formed of foamed plastic, but at least a portion that overlaps the test objects x1 and x2 placed on the gantry body 2 may be formed of foamed plastic.

  As the foamed plastic, extruded foamed polystyrene conforming to JIS A 9511 is used. This foamed plastic has a volume density as small as about 1/30 of that of a synthetic resin and is excellent in antistatic properties.

  For this reason, if the X-ray imaging gantry 41 is used, the image of the gantry itself is further reduced in the image, and the image discrimination accuracy can be further improved.

  Further, the X-ray imaging gantry 41 is characterized in that the foam 46 can be easily processed with a normal tool such as a cutter knife and can be optimized at the site as required. In particular, in order to safely transport the test objects x1 and x2 in the X-ray examination apparatus 71 of FIG. 7, it is necessary to appropriately process the foam 46 to create a specific shape (for example, deformation) For example, when you want to inspect the test object. In this case, the ease of processing of the foam 46 is a great advantage of using foam plastic.

A second reference embodiment unrelated to the present invention will be described.

  As shown in FIGS. 5A and 5B, the X-ray imaging gantry 51 includes an inclined tray 53 having different front and rear heights in addition to the configuration of the X-ray imaging gantry 41 in FIG. The gantry body 52 is formed by placing the foam 46 and the auxiliary plate 43 on the inclined tray 53.

  The configuration of the inclined tray 53 is basically the same as that of the inclined tray 33 in FIG. 3, but a second stopper 55 made of foamed plastic is further provided at a portion other than the lower end portion of the front surface of the stopper 35. At the lower end portion of the front surface of the stopper 35, the second stopper 55 is partially removed in order to set the integrated body of the foam 46 and the auxiliary plate 43 by sliding it from above along the inclined surface 34.

  In the X-ray imaging gantry 51, the second stopper 55 allows the test object x1 to be placed on the inclined tray 53 more safely and stably via the auxiliary plate 43 and the foam 46.

A third reference embodiment unrelated to the present invention will be described.

  As shown in FIG. 6, the X-ray imaging pedestal 61 is a modification of the X-ray imaging pedestal 51 in FIG. 5, and inspecting the test object x <b> 2, The gantry body 62 is formed by making the inclination angle θ6 smaller than the inclination angle θ3 of FIGS.

In the third reference embodiment , the specimen x2 is placed on the inclined tray 63 more safely and stably via the auxiliary plate 3 and the foam 46 while maintaining the discrimination accuracy of the specimen x2. Therefore, the inclination angle θ5 is set to 5 °.

  4 may be combined with the X-ray imaging gantry 1 of FIG. 1 or the X-ray imaging gantry 21 of FIG.

FIG. 1A is a plan view of an X-ray imaging gantry showing a preferred first embodiment of the present invention, FIG. 1B is a side view thereof, and FIG. 1C is 1C in FIG. 1C is a sectional view taken along line 1D-1D in FIG. 1A, FIG. 1E is a sectional view taken along line 1E-1E in FIG. 1A, and FIG. FIG. FIG. 2A is a plan view of an X-ray imaging gantry showing a second embodiment of the present invention, FIG. 2B is a side view thereof, and FIG. 2C is a transverse sectional view thereof. It is a side view of the mount for X-ray imaging which shows the 3rd Embodiment of this invention. 4 (a) is a plan view of the X-ray imaging gantry showing the irrelevant first reference embodiment the present invention, and FIG. 4 (b) is a side view, FIG. 4 (c) is next to cross-sectional views . FIG. 5A is a side view of the X-ray imaging gantry before placing the test object, showing a second reference embodiment irrelevant to the present invention. FIG. 5B is a side view of the test object mounted thereon. It is. It is a side view of the X-ray imaging stand which shows the 3rd reference form unrelated to this invention . It is a schematic side view explaining the test | inspection method using the X-ray imaging stand shown in FIG. FIG. 8A is a schematic diagram of an X-ray photograph taken from a horizontal direction (a direction perpendicular to the paper surface in FIG. 8A) using a conventional X-ray imaging stand, and FIG. 8B is a processed image thereof. It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 X-ray imaging stand 2 Base body 3 Auxiliary plate 4 Resin plate 5 Convex part 6 Lattice body 7 V groove x1, x2 Test object

Claims (5)

The upper surface of the pedestal body, together with forming a V groove in order put the tubular test object consisting of bullet and dropped type bombs, irradiates X-rays horizontally from the side to the test object of the V-groove to be in X-ray imaging gantry for determining the internal structure of Kenbutsu by X-ray imaging, extended the cradle body, the respective resin plate with upstanding resin plate to form a grid body which is the intersection of the V groove An X-ray imaging gantry characterized by being arranged obliquely with respect to a direction so that each resin plate is inclined with respect to the X-ray irradiation direction during X-ray imaging. On SL gantry main body, X-rays imaging gantry of claim 1, wherein the formation of a foam consisting of foamed plastic. The X-ray imaging pedestal according to claim 1 or 2 , wherein the lattice body is formed in a shape in which the height of one end and the other end in the longitudinal direction is different, and the test object is inclined and placed . The X-ray imaging gantry according to any one of claims 1 to 3, wherein the gantry body is formed by placing the lattice body on an inclined tray having different heights at one end and the other end in the longitudinal direction . 5. The X-ray imaging gantry according to claim 1, wherein a storage groove for storing a protruding piece protruding from an outer periphery of the test object is formed in the lattice body.

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