X-ray flying spot scanning device applied to back scattering imaging

Abstract

The utility model discloses an X-ray flying spot scanning device applied to back scattering imaging, which relates to the technical field of security and industrial detection, and comprises an X-ray source, a mounting mechanism and an adjusting mechanism, the adjusting mechanism comprises a rotating platform, the top of the rotating platform is provided with a beam disc, and the beam disc is connected with the mounting mechanism. A plurality of fastening bolts are arranged between the rotating platform and the beam disc, the rotating platform and the beam disc are fixedly connected through the fastening bolts, the beam disc is arranged on the outer side of the X-ray source, a plurality of light passing paths are formed in the outer wall of the top of the beam disc, and a driven gear is fixedly installed at the bottom of the rotating platform. The X-ray source can be mounted and fixed through the mounting mechanism, so that a worker can conveniently mount and replace the X-ray source, and the driven gear rotates to drive the rotating platform to rotate and drive the beam disc to rotate, so that the light path moves along the slit direction of the X-ray source, and the X-ray source can be conveniently mounted and replaced. And the obtained X-ray flying spots are more uniform.

Description

Technical Field

[0001] The utility model relates to the technical fields of security and industrial detection, and particularly relates to an X-ray flying spot scanning device applied to backscatter imaging. Background Art

[0002] The interaction between X-rays and matter mainly includes: photoelectric effect, coherent scattering, Compton scattering, and electron pair effect, etc. X-ray backscatter imaging is based on the Compton scattering principle, and the detection of matter is realized by detecting the Compton scattering signal of incident X-rays by matter. The Compton scattering cross-section of low atomic number and low density substances (drugs, explosives, etc. mainly composed of C, H, O, N) is relatively large, and the scattering signal is strong, while the scattering cross-section of metal substances is small and the scattering signal is weak. Therefore, the type of matter can be judged based on the difference in the intensity of the matter scattering signal.

[0003] The flying spot X-ray implementation methods of existing backscatter imaging detectors on the market are all realized by driving a chopper wheel to move with a motor. The specific working principle is as follows: The conical beam generated by the X-ray tube is collimated into a fan-shaped beam through a pre-collimation slit, and then irradiated on a high-speed rotating chopper wheel. A number of radially distributed slits are opened on the chopper wheel, and the area outside the slits is shielded with high atomic number materials to ensure that X-rays cannot pass through the part outside the chopper wheel slits. During the high-speed rotation of the chopper wheel, there is only one slit intersecting with the pre-collimation slit at the same moment. Therefore, when the fan-shaped X-ray passes through the chopper wheel, a thin X-ray beam can be formed and a one-dimensional high-speed line scan is performed in the vertical direction. At the same time, the other dimension scan is generated by the relative movement between the object to be inspected and the device. The detector and the X-ray tube are both located on the same side of the object to be inspected. When the detector receives the backscatter signal generated by the object to be inspected, the optical signal is converted into an electrical signal, and the sequential electrical signals are reconstructed into a two-dimensional backscatter image of the object to be inspected by using an algorithm.

[0004] The existing technology has the following deficiencies: The technology involved in the existing chopper wheel flying spot device is relatively complex, and precise motor drive and control systems are required to ensure the periodic generation of the X-ray beam, which increases the manufacturing cost and maintenance difficulty of the device. At the same time, since the chopper wheel needs to be placed on the X-ray source side, plus the drive motor of the chopper wheel, the volume is often large in structural design, which is not conducive to miniaturization. Due to the chopper wheel method, the flying spot is realized through the intersection point of two slits, and the areas formed by the intersection of the two slits at different angles of the ray are different, so the slits on the chopper wheel cannot be made of equal width and need to be made into a slit triangular structure, which has extremely high requirements for design and processing and often requires a high cost. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an X-ray flying spot scanning device for backscatter imaging. The X-ray source can be installed and fixed through the installation mechanism, so that the staff can easily install and replace the X-ray source. The rotation of the driven gear can drive the rotating platform to rotate, and can drive the beam disk to rotate, so that the light path moves along the direction of the X-ray source slit, and the obtained X-ray flying spot is more uniform, so as to solve the above-mentioned shortcomings in the technology.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solution: an X-ray flying spot scanning device for backscatter imaging, comprising an X-ray source, and further comprising:

[0007] The mounting mechanism is provided at the bottom of the X-ray source and is used for mounting and fixing the X-ray source;

[0008] An adjustment mechanism is provided at the bottom inner side of the mounting mechanism and outside the X-ray source;

[0009] The adjustment mechanism includes a rotating platform, a beam disc is provided on the top of the rotating platform, a plurality of fastening bolts are provided between the rotating platform and the beam disc and fixedly connected by the fastening bolts, the beam disc is provided outside the X-ray source, a plurality of light paths are formed on the outer wall of the top of the beam disc, and a driven gear is fixedly installed on the bottom of the rotating platform;

[0010] The adjustment mechanism also includes a rotating shaft, which is arranged on the inner wall of one end of the mounting mechanism. A driving motor is provided at one end of the rotating shaft, and a driving gear is fixedly sleeved on the outer side of the other end of the rotating shaft, and the driving gear is meshed with the driven gear.

[0011] Preferably, the mounting mechanism includes a mounting seat, a fixing column is fixedly mounted at the middle position of the bottom inner side of the mounting seat, and support plates are fixedly mounted at both ends of the top of the fixing column.

[0012] Preferably, the tops of the two support plates are movably connected to the outer walls at both ends of the bottom of the X-ray source, and a clamp for fixing the X-ray source is rotatably installed on one side of the tops of the two support plates.

[0013] Preferably, the inner wall of one inner end of the mounting seat is rotatably connected to the rotating shaft, the outer wall of one end of the mounting seat is fixedly connected to the driving motor, and the driving motor and the rotating shaft are transmission-connected via an output shaft.

[0014] Preferably, the top of the mounting seat is rotatably connected to the rotating platform, the rotating platform is movably sleeved on the outside of the fixed column, and the inner wall diameter of the mounting seat is larger than the diameter of the driven gear.

[0015] Preferably, the plurality of light passing diameters are arranged in an equidistant circular pattern, and the central positions of the light passing diameters are at the same height as the central position of the X-ray source outlet.

[0016] Preferably, a placement groove is formed at the inner top of the rotating platform, and the inner wall of the placement groove is movably connected to the bottom of the beam disc.

[0017] Preferably, the beam disc is arranged in an annular structure and is made of materials with atomic numbers such as lead and tungsten.

[0018] In the above technical solution, the technical effects and advantages provided by the present invention are as follows:

[0019] 1. The X-ray source can be installed and fixed through the clamp and the support plate, enabling the staff to conveniently install and replace the X-ray source. When the driving motor operates, the rotating shaft rotates. Through the meshing between the driving gear and the driven gear, the rotating platform rotates on the top of the mounting seat, and then the beam disc can be driven to rotate, so that the light passing diameter can make a circular motion along the slit direction of the X-ray source, making the obtained X-ray flying spots more uniform, greatly reducing the manufacturing and processing requirements of the beam disc. At the same time, the X-ray source is placed in the hollow structure, with a more compact design, which is more conducive to miniaturization of the whole machine;

[0020] 2. The beam disc can be installed and placed through the placement groove, and the fastening bolts can connect and fix the beam disc and the rotating platform, enabling the beam disc to rotate stably with the rotating platform. At the same time, the mounting seat can support and limit the rotation of the rotating platform, keeping the rotating platform stable during rotation. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a front vertical sectional view of the present invention.

[0024] Figure 3 It is an exploded perspective view of the installation mechanism of the present invention.

[0025] Figure 4 It is an exploded perspective view of the adjustment mechanism of the present invention.

[0026] Description of the Reference Numerals:

[0027] 1. X-ray source;

[0028] 2. Installation mechanism; 201. Mounting base; 202. Fixed column; 203. Support plate; 204. Clamp;

[0029] 3. Adjustment mechanism; 301. Rotating platform; 302. Placement groove; 303. Beam disc; 304. Tightening bolt; 305. Light passing diameter; 306. Driven gear; 307. Rotating shaft; 308. Driving motor; 309. Driving gear. Specific implementation manner

[0030] The utility model provides an X-ray flying spot scanning device for backscatter imaging as shown in Figure 1 Figure, which includes an X-ray source 1 and also includes:

[0031] An installation mechanism 2, which is arranged at the bottom of the X-ray source 1 and is used for installing and fixing the X-ray source 1;

[0032] An adjustment mechanism 3, which is arranged at the inner bottom of the installation mechanism 2 and is located outside the X-ray source 1.

[0033] In order to conveniently adjust the beam disc 303, as shown in Figure 1-2 and Figure 4 Figure, the adjustment mechanism 3 includes a rotating platform 301. A beam disc 303 is arranged on the top of the rotating platform 301. A plurality of tightening bolts 304 are arranged between the rotating platform 301 and the beam disc 303 and are fixedly connected through the tightening bolts 304. The beam disc 303 is arranged outside the X-ray source 1. A plurality of light passing diameters 305 are arranged on the outer wall of the top of the beam disc 303. A driven gear 306 is fixedly installed at the bottom of the rotating platform 301. The adjustment mechanism 3 further includes a rotating shaft 307. The rotating shaft 307 is arranged on the inner wall of one end of the installation mechanism 2. A driving motor 308 is arranged at one end of the rotating shaft 307. A driving gear 309 is fixedly sleeved on the outer side of the other end of the rotating shaft 307. The driving gear 309 meshes with the driven gear 306. When the driving motor 308 works, through the meshing action between the driving gear 309 and the driven gear 306, the rotating platform 301 rotates, and then the beam disc 303 can be driven to rotate along the slit of the X-ray source 1, making the X-ray flying spots more uniform.

[0034] In order to conveniently install and replace the X-ray source 1, as shown in Figure 1-3As shown in the figure, the installation mechanism 2 includes an installation base 201. In the middle of the inner bottom of the installation base 201, a fixed column 202 is fixedly installed. At both ends of the top of the fixed column 202, support plates 203 are fixedly installed. The tops of the two support plates 203 are respectively movably connected to the outer walls at both ends of the bottom of the X-ray source 1. On one side of the tops of the two support plates 203, clamps 204 for fixing the X-ray source 1 are rotatably installed. The X-ray source 1 can be installed and fixed through the support plates 203 and the clamps 204, enabling the staff to conveniently install and replace the X-ray source 1.

[0035] To provide power for the rotation of the beam disc 303, as Figure 2 shown, one end of the inner wall of the installation base 201 is rotatably connected to the rotating shaft 307. The outer wall of one end of the installation base 201 is fixedly connected to the drive motor 308. The drive motor 308 and the rotating shaft 307 are connected by a transmission through the output shaft. The installation base 201 can install and fix the rotating shaft 307 and the drive motor 308. When the drive motor 308 works, the rotating shaft 307 rotates. Through the meshing between the driving gear 309 and the driven gear 306, the rotating platform 301 can drive the beam disc 303 to rotate.

[0036] To make the beam disc 303 stable during rotation, as Figure 2-4 shown, the top of the installation base 201 is rotatably connected to the rotating platform 301. The rotating platform 301 is movably sleeved on the outside of the fixed column 202. The inner wall diameter of the installation base 201 is larger than the diameter of the driven gear 306. A placement groove 302 is provided at the top inside the rotating platform 301. The inner wall of the placement groove 302 is movably connected to the bottom of the beam disc 303. The beam disc 303 is arranged in an annular structure and is made of materials with atomic numbers such as lead and tungsten. The placement groove 302 can install and fix the beam disc 303, and the installation base 201 can support and limit the rotation of the rotating platform 301.

[0037] To make the X-ray flying spots more uniform, as Figure 2-4 shown, multiple light passing diameters 305 are arranged in an equally spaced annular pattern. The central position of the light passing diameter 305 is at the same height as the central position of the outlet of the X-ray source 1. The equally spaced light passing diameters 305 prevent the emitted X-rays from passing through two light passing diameters 305 simultaneously, ensuring that the same area is not scanned repeatedly within the same period. Each time the light passing diameter 305 passes through a fan-shaped ray area, an X-ray flying spot is formed.

[0038] When performing security and industrial inspection work, the X-ray source 1 is installed on the tops of two support plates 203. Then, by rotating two clamps 204, the top of the X-ray source 1 is clamped and fixed. At the same time, the rotating shaft 307 is installed on the inner wall of one end of the mounting base 201, so that the driving gear 309 can be located at the inner end of the mounting base 201. Then, the rotating platform 301 is sleeved on the outside of the fixed column 202, so that the driven gear 306 can mesh with the driving gear 309. Then, the beam disc 303 is sleeved on the outside of the fixed column 202 so that its bottom can be placed in the placement groove 302. Then, the fastening bolt 304 is used to connect and fix the beam disc 303 and the rotating platform 301, so that the central position of one of the light passing diameters 305 of the beam disc 303 can be aligned with the central position of the wire outlet of the X-ray source 1. Then, by the operation of the driving motor 308, the rotating shaft 307 rotates, and thus the driving gear 309 rotates. Through the meshing action between the gear parts, the driven gear 306 rotates, and thus the rotating platform 301 rotates on the top of the mounting base 201. Due to the connection of the fastening bolt 304, the beam disc 303 can perform a circular motion along the slit direction of the X-ray source 1. From the perspective of the final imaging projection, the light passing diameter 305 forms an X-ray flying spot, and the flying spot moves linearly along the slit direction, moving from one end of the slit to the other end and repeating in cycles. From the final image, the light passing diameter 305 forms a line of data after passing through the slit once, enabling the device to be conveniently used for security or industrial inspection work. This embodiment specifically solves the problems in the prior art that the chopping wheel flying spot device is large in volume, not conducive to miniaturization, and has high processing difficulty and high processing cost.

[0039] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An X-ray flying spot scanning device applied to backscatter imaging, comprising an X-ray source (1), characterized in that, Also includes: A mounting mechanism (2) is provided at the bottom of the X-ray source (1) and is used to mount and fix the X-ray source (1); An adjustment mechanism (3) is arranged at the bottom of the inner side of the mounting mechanism (2) and is located outside the X-ray source (1); The adjustment mechanism (3) includes a rotating platform (301), a beam disc (303) is provided on the top of the rotating platform (301), a plurality of fastening bolts (304) are provided between the rotating platform (301) and the beam disc (303), and the beam disc (303) is fixedly connected via the fastening bolts (304), the beam disc (303) is arranged outside the X-ray source (1), a plurality of light paths (305) are opened on the outer wall of the top of the beam disc (303), and a driven gear (306) is fixedly installed on the bottom of the rotating platform (301); The adjusting mechanism (3) further comprises a rotating shaft (307), the rotating shaft (307) being arranged on the inner wall of one end of the mounting mechanism (2), a driving motor (308) being arranged at one end of the rotating shaft (307), and a driving gear (309) being fixedly sleeved on the outer side of the other end of the rotating shaft (307), the driving gear (309) being meshed with the driven gear (306).

2. The X-ray flying spot scanning device applied to backscatter imaging according to claim 1, wherein: The mounting mechanism (2) comprises a mounting seat (201), a fixing column (202) is fixedly mounted at the middle position of the bottom inner side of the mounting seat (201), and support plates (203) are fixedly mounted at both ends of the top of the fixing column (202).

3. The X-ray flying spot scanning device applied to backscatter imaging according to claim 2, characterized in that: The tops of the two support plates (203) are movably connected to the outer walls at both ends of the bottom of the X-ray source (1), and a clamp (204) for fixing the X-ray source (1) is rotatably installed on one side of the top of the two support plates (203).

4. An X-ray flying spot scanning device applied to backscatter imaging according to claim 2, characterized in that: The inner wall of one end of the mounting seat (201) is rotatably connected to the rotating shaft (307), and the outer wall of one end of the mounting seat (201) is fixedly connected to the driving motor (308). The driving motor (308) and the rotating shaft (307) are connected through an output shaft.

5. The X-ray flying spot scanning device applied to backscatter imaging according to claim 2, characterized in that: The top of the mounting seat (201) is rotatably connected to the rotating platform (301), and the rotating platform (301) is movably sleeved on the outside of the fixed column (202). The inner wall diameter of the mounting seat (201) is larger than the diameter of the driven gear (306).

6. The X-ray flying spot scanning device applied to backscatter imaging according to claim 1, wherein: The plurality of light paths (305) are arranged in a ring at equal intervals, and the center position of the light path (305) is at the same height as the center position of the outlet of the X-ray source (1).

7. An X-ray flying spot scanning device applied to backscatter imaging according to claim 1, characterized in that: A placement groove (302) is provided on the top inner side of the rotating platform (301), and the inner wall of the placement groove (302) is movably connected to the bottom of the beam optical disc (303).

8. An X-ray flying spot scanning device applied to backscatter imaging according to claim 1, characterized in that: The beam disc (303) is configured as a circular ring structure.

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