CN113835129A - Flying spot scanning device and back scattering safety detection system - Google Patents
Flying spot scanning device and back scattering safety detection system Download PDFInfo
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- CN113835129A CN113835129A CN202010579159.9A CN202010579159A CN113835129A CN 113835129 A CN113835129 A CN 113835129A CN 202010579159 A CN202010579159 A CN 202010579159A CN 113835129 A CN113835129 A CN 113835129A
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- G—PHYSICS
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
- G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
- G01V5/222—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays measuring scattered radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/20008—Constructional details of analysers, e.g. characterised by X-ray source, detector or optical system; Accessories therefor; Preparing specimens therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/20083—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials by using a combination of at least two measurements at least one being a transmission measurement and one a scatter measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/203—Measuring back scattering
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Abstract
The invention relates to a flying spot scanning device and a back scattering safety detection system, wherein the flying spot scanning device comprises a ray source (10), a flying spot forming device (20) and a driving device (30), the ray source (10) is used for emitting rays, the flying spot forming device (20) is configured to process the rays emitted by the ray source (10) into continuously emergent point-shaped beams, the driving device (30) is configured to drive the flying spot forming device (20) to rotate relative to the ray source (10), the driving device (30) comprises a stator assembly (31) and a rotor assembly (32) in rotating connection with the stator assembly (31), and the flying spot forming device (20) abuts against the rotor assembly (32) and is connected with the rotor assembly (32). The flying spot forming device is abutted against the rotor assembly of the driving device and is directly connected with the rotor assembly, and an intermediate transmission mechanism is not arranged between the flying spot forming device and the rotor assembly, so that the structure of the flying spot scanning device can be simplified, and the transmission efficiency can be improved.
Description
Technical Field
The invention relates to the technical field of safety detection, in particular to a flying spot scanning device and a back scattering safety detection system.
Background
The X-ray back scattering imaging technology is widely applied to the fields of safety inspection, nondestructive inspection and the like due to the advantages of low radiation dose, sensitivity to light materials, convenient layout and the like. The technology utilizes a flying spot scanning device to modulate a primary collimated X-ray fan-shaped beam into a continuously emergent spot beam.
In the related art, the flying spot scanning device comprises a motor and a rotary component, wherein the motor and the rotary component are connected together through a mechanical transmission mechanism, the rotation of the motor is used as a power source, and the power source is transmitted to the rotary component through the mechanical transmission mechanism, so that the X-ray flying spot scanning imaging is realized. The mechanical transmission mechanism comprises a belt pulley, and the motor drives the rotating part to rotate through the belt pulley; or the mechanical transmission mechanism comprises a coupler, and the motor drives the rotating part to rotate through the coupler.
The flying spot scanning device has the advantages of multiple intermediate transmission links and fault points, low energy conversion efficiency, complex design, development and assembly process, relatively higher cost, larger volume and weight, difficulty in controlling mechanical vibration and noise, difficulty in realizing high-precision transmission and high-speed operation, and particularly greater influence on high-power or high-speed occasions, so that the problems of edge burrs, vertical lines between columns and the like are caused to X-ray backscatter imaging, and the performance index of an image is influenced.
It is noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a flying spot scanning device and a back scattering safety detection system, which simplify the structure of the flying spot scanning device and have higher transmission efficiency.
According to an aspect of the present invention, there is provided a flying spot scanning apparatus comprising:
a radiation source for emitting radiation;
a flying spot forming device configured to process the rays emitted by the ray source into continuously emergent spot beams; and
and the driving device is configured to drive the flying spot forming device to rotate relative to the ray source, the driving device comprises a stator component and a rotor component in rotating connection with the stator component, and the flying spot forming device abuts against and is connected with the rotor component.
In some embodiments, the stator assembly includes a stator core and a stator winding wound on the stator core, the rotor assembly includes a first rotating shaft, a rotor core mounted on the first rotating shaft, and a permanent magnet mounted on the rotor core, and the flying spot forming device abuts against an end of the first rotating shaft and is connected with the first rotating shaft.
In some embodiments, the drive apparatus further includes a housing, the stator assembly and the rotor assembly each disposed within the housing, the housing having a fluid passage disposed therein, the fluid passage configured to allow fluid circulating therein to cool the stator assembly and the rotor assembly.
In some embodiments, the driving device further includes a housing mounted on the housing, and a first fan disposed inside the housing, an exhaust chamber formed inside the housing is communicated with the outlet of the fluid passage, and a circumferential side of the housing is provided with an air outlet so that the fluid inside the housing flows out in a radial direction of the first fan.
In some embodiments, the stator assembly is mounted to an inner wall of the housing, the rotor assembly is disposed within the central through-hole of the stator assembly, the rotor assembly includes a first rotating shaft, and the fluid channel includes a first channel disposed in the first rotating shaft.
In some embodiments, the driving device further includes a first fan including a second rotating shaft and a blade mounted on the second rotating shaft, and the fluid passage includes a second passage provided to the second rotating shaft, and the second rotating shaft is coupled to the first rotating shaft to communicate the first passage with the second passage.
In some embodiments, the fluid passages further include a third passage disposed between the stator assembly and the rotor assembly, an outlet of the third passage being in communication with the exhaust plenum.
In some embodiments, the drive device further comprises a second fan disposed upstream of the inlet of the fluid passageway.
In some embodiments, the flying spot forming device includes a bearing disc and a rotating ring mounted on the bearing disc, the bearing disc abuts against and is connected with the rotor assembly, the rotating ring is provided with a first collimating hole, and the first collimating hole is configured to process the rays emitted by the ray source into continuous flying spots when the rotating ring rotates along with the bearing disc relative to the ray source.
In some embodiments, the swivel is provided with a shielding structure for shielding radiation not emitted through the first collimating aperture.
In some embodiments, the flying spot scanning device further includes a collimator disposed between the radiation source and the flying spot forming device, the collimator includes a collimator body, the collimator body is provided with a second collimating hole, the radiation emitted by the radiation source is emitted through the second collimating hole, the swivel is provided with two ring grooves, a boss is formed between the two ring grooves, the first collimating hole is disposed on the boss, the radial outer end of the collimator body is provided with a groove, the boss is inserted into the groove, the radial outer end of the collimator body is inserted into the ring groove, and the first radial outer end of the boss is closer to the axis of the bearing disc than the second radial outer end of the collimator body.
In some embodiments, the swivel includes an annular body and an adjusting block, the adjusting block is detachably mounted on the annular body, the first collimating hole is provided on the adjusting block, and a diameter of the first collimating hole gradually decreases along an emitting direction of the ray.
In some embodiments, the inner wall of the bearing disc is provided with a limiting structure for limiting the rotating ring.
In some embodiments, the carrier plate comprises a cylindrical portion, the radiation source being arranged in the center of the cylindrical portion, the cylindrical portion being provided with a third collimating aperture communicating with the first collimating aperture, and the axis of the third collimating aperture extending in a radial direction of the carrier plate.
In some embodiments, the flying spot forming device includes a bearing disc, the radiation source is disposed on an axial side of the bearing disc, the bearing disc is provided with a third collimating hole, and an axis of the third collimating hole extends along an axial direction of the bearing disc.
According to another aspect of the present invention, a backscatter security detection system is provided, which includes a detector and the above-mentioned flying spot scanning device, wherein the detector is configured to receive a radiation reflected by a radiation emitted by the flying spot scanning device after the radiation irradiates on an object to be detected.
Based on the technical scheme, the flying spot forming device in the embodiment of the invention is abutted against the rotor assembly of the driving device and is connected with the rotor assembly, namely the flying spot forming device is directly connected with the rotor assembly, and an intermediate transmission mechanism is not arranged between the flying spot forming device and the rotor assembly, so that the structure of the flying spot scanning device can be simplified, the volume and the weight of the flying spot scanning device can be reduced, the problems of more fault points, larger vibration and noise and the like caused by the existence of the intermediate transmission mechanism can be avoided, the transmission precision and the running speed can be improved, and the imaging quality can be improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of a flying spot scanning device according to the present invention.
Fig. 2 is a schematic structural diagram of a driving device in an embodiment of the flying spot scanning apparatus of the invention.
Fig. 3 is a schematic structural diagram of a first fan in an embodiment of a flying spot scanning apparatus according to the invention.
Fig. 4 is a schematic diagram of a fitting structure of a swivel and a collimator body in an embodiment of the flying spot scanning apparatus of the invention.
Fig. 5 is a schematic structural diagram of another embodiment of the flying spot scanning device according to the present invention.
FIG. 6 is a schematic structural diagram of the carrier tray of FIG. 5 according to the present invention.
In the figure:
10. a radiation source; 20. a flying spot forming device; 30. a drive device; 40. a collimator; 50. a base;
11. a sector;
21. a carrier tray; 211. a third collimating aperture;
22. rotating the ring; 221. a first collimating aperture; 222. a ring groove; 223. a boss; 224. an adjusting block; 225. a first radially outer end face;
23. pressing a ring; 24. a bolt; 25. a stopper; 26. a bump;
31. a stator assembly; 32. a rotor assembly; 33. a bearing assembly; 34. a drive assembly; 35. a heat dissipating component;
301. a housing;
311. a stator core; 312. a stator winding;
321. a first rotating shaft; 322. a rotor core; 323. a permanent magnet; 324. a first retainer ring; 325. a second retainer ring;
331. a first bearing; 332. a second bearing; 333. a first spacer sleeve; 334. a second spacer sleeve; 335. tabletting; 336. a blocking cover; 337. a blocking sleeve; 338. a collar; 339. a baffle plate; 340. locking the nut;
341. a control unit; 342. a magnetic ring; 343. a sensor; 344. a support; 345. a plug;
351. a housing; 352. a first fan; 353. an air outlet; 354. a first channel; 355. a second channel; 356. a third channel; 357. a second fan; 358. a through hole; 359. an exhaust chamber;
41. a collimator body; 411. a second collimating aperture; 412. a groove; 413. a second radially outer end surface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the scope of the invention.
Referring to fig. 1 to 6, in some embodiments of the flying spot scanning device provided by the present invention, the flying spot scanning device includes a radiation source 10, a flying spot forming device 20 and a driving device 30, the radiation source 10 is used for emitting radiation, the flying spot forming device 20 is configured to process the radiation emitted from the radiation source 10 into a continuously emitted spot-shaped beam, the driving device 30 is configured to drive the flying spot forming device 20 to rotate relative to the radiation source 10, the driving device 30 includes a stator assembly 31 and a rotor assembly 32 rotationally connected to the stator assembly 31, the flying spot forming device 20 abuts against the rotor assembly 32, and the flying spot forming device 20 is connected to the rotor assembly 32.
In the above embodiment, the flying spot forming device 20 abuts against the rotor assembly 32 of the driving device 30 and is connected with the rotor assembly 32, that is, the flying spot forming device 20 is directly connected with the rotor assembly 32, and there is no intermediate transmission mechanism between the flying spot forming device 20 and the rotor assembly 32, so that the structure of the flying spot scanning device can be simplified, and the volume and weight of the flying spot scanning device can be reduced; meanwhile, the problems of multiple fault points, high vibration and noise and the like caused by the existence of the intermediate transmission mechanism are avoided; the transmission precision and the running speed are improved, and the imaging quality is improved; therefore, miniaturization and high efficiency of the flying spot scanning device are facilitated, and reliability is improved.
As shown in fig. 2, in some embodiments, the stator assembly 31 includes a stator core 311 and a stator winding 312 wound on the stator core 311, the rotor assembly 32 includes a first rotating shaft 321, a rotor core 322 mounted on the first rotating shaft 321, and a permanent magnet 323 mounted on the rotor core 322, and the flying spot forming device 20 abuts against an end of the first rotating shaft 321 and is connected with the first rotating shaft 321.
After the stator assembly 31 is energized with current, a rotating magnetic field can be generated, and the rotor assembly 32 can rotate synchronously with the rotating magnetic field without excitation, so as to drive the flying spot forming device 20 to rotate.
In some embodiments, the drive device 30 further comprises a housing 301, and the stator assembly 31 and the rotor assembly 32 are both disposed within the housing 301.
The stator assembly 31 is stationary relative to the housing 301 for generating a rotating magnetic field. The stator core 311 may be made of a material with high magnetic permeability, the inner circular surface of the stator core 311 is provided with uniformly distributed grooves, and the stator winding 312 is embedded in the grooves of the stator core 311 to generate a rotating magnetic field after being energized. The outer circumferential surface of the stator core 311 is mounted on the inner wall of the case 301 in a hot press manner.
The rotor assembly 32 may also be configured as a copper bar or cast aluminum cage that generates a rotor magnetic field by stator excitation induction.
In some embodiments, the drive apparatus further comprises a bearing assembly 33, the bearing assembly 33 being disposed between the stator assembly 31 and the rotor assembly 32. The bearing assembly 33 is used to support the rotor assembly 32.
In some embodiments, bearing assembly 33 employs a dual left and right support structure. The bearing assembly 33 includes a first bearing 331 and a second bearing 332 at the carrying end (near the flying spot forming device 20) and the tail (far from the flying spot forming device 20) of the first rotating shaft 321, respectively, with the stator assembly 31 and the rotor assembly 32 interposed between the first bearing 331 and the second bearing 332.
The first bearing 331 and the second bearing 332 can adopt oppositely-mounted angular contact ceramic ball bearings, the first bearing 331 is relatively large in size, and the clearance and the prepressing are adjusted through a first spacer 333; the second bearing 332 is relatively small in size, with the backlash and preload adjusted by the second spacer 334.
The outer side of the outer wall of the first bearing 331 is limited by the pressing sheet 335, and the second bearing 332 is limited by the blocking cover 336, the blocking sleeve 337, the collar 338, the blocking sheet 339 and the locking nut 340.
The cover 336 also has the function of enclosing the housing 301, and the cover 336 has a plurality of through holes 358 formed on its end surface, the through holes 358 being used for air circulation.
In some embodiments, a fluid passage is provided within housing 301, the fluid passage being configured to allow fluid circulating therein to cool stator assembly 31 and rotor assembly 32.
By providing the fluid passage, the stator assembly 31 and the rotor assembly 32 can be cooled, and the stator assembly 31 and the rotor assembly 32 are prevented from being damaged due to heat.
As shown in fig. 3, in some embodiments, the driving device 30 further includes a heat dissipation assembly 35, the heat dissipation assembly 35 includes a casing 351 mounted on the housing 301 and a first fan 352 disposed inside the casing 351, an exhaust chamber 359 formed inside the casing 351 is communicated with an outlet of the fluid passage, and a circumferential side surface of the casing 351 is provided with an air outlet 353 so that the fluid inside the casing 351 flows out in a radial direction of the first fan 352.
By providing the outer cover 351 and the first fan 352, the axial flow fan structure is formed on the side of the casing 301 away from the flying spot forming device 20, so that the air flow in the casing 301 can be accelerated, and the cooling effect on the stator assembly 31 and the rotor assembly 32 can be improved.
As shown in fig. 2, in some embodiments, the stator assembly 31 is mounted on an inner wall of the housing 301, the rotor assembly 32 is disposed in a central through hole of the stator assembly 31, the rotor assembly 32 includes a first rotating shaft 321, and the fluid passage includes a first passage 354 disposed on the first rotating shaft 321.
The first rotating shaft 321 is a hollow structure, so that the overall weight of the rotor assembly 32 can be reduced, and the first rotating shaft 321 can be cooled better.
In some embodiments, the driving device 30 further includes a first fan 352, the first fan 352 includes a second rotating shaft and a blade mounted on the second rotating shaft, the fluid passage includes a second passage 355 provided on the second rotating shaft, and the second rotating shaft is connected to the first rotating shaft 321 such that the first passage 354 communicates with the second passage 355.
The second shaft is connected to the first shaft 321, and the first fan 352 can be driven to rotate by the rotation of the first shaft 321,
in some embodiments, the fluid passages further include a third passage 356 disposed between the stator assembly 31 and the rotor assembly 32, the outlet of the third passage 356 being in communication with the exhaust chamber 359.
The air entering the housing 301 can enter the exhaust chamber 359 of the housing 351 through the first passage 354 and the second passage 355 on the first rotating shaft 321; the exhaust chamber 359 of the housing 351 may also be accessed through a third passageway 356 between the stator assembly 31 and the rotor assembly 32, through holes 358 in the cover 336. After entering the exhaust chamber 359, the air flows radially under the action of centrifugal force with the rotation of the first fan 352, and is accelerated and thrown out through the air outlet 353 of the housing 351. It can be seen that at least two fluid passages are provided in the housing 301, which can achieve a better cooling effect for the stator assembly 31 and the rotor assembly 32.
In some embodiments, the drive device 30 further comprises a second fan 357 disposed upstream of the inlet of the fluid passageway. The second fan 357 may be mounted on the first rotating shaft 321. By providing the second fan 357, more air can be let into the housing 301.
The heat dissipation assembly 35 adopts a gas medium cooling mode, the first fan 352 and the second fan 357 are driven by the rotation of the first rotating shaft 321 to form air convection, and heat circulation exchange is performed with the external environment.
As shown in fig. 4, in some embodiments, the flying spot forming apparatus 20 includes a carrier disc 21 and a rotating ring 22 mounted on the carrier disc 21, the carrier disc 21 abuts against the rotor assembly 32 and is connected to the rotor assembly 32, the rotating ring 22 is provided with a first collimating hole 221, and the first collimating hole 221 is configured to process the radiation emitted by the radiation source 10 into continuous flying spots when the rotating ring 22 rotates with the carrier disc 21 relative to the radiation source 10. The carrier plate 21 may be made of an aluminum alloy. The carrier plate 21 is connected to the rotor assembly 32, so that the rotor assembly 32 drives the carrier plate 21 to rotate, and the rotary ring 22 is mounted on the carrier plate 21 and thus rotates with the carrier plate 21.
In some embodiments, the swivel 22 is provided with a shielding structure that shields the radiation that does not exit through the first collimating aperture 221.
By providing the shielding structure, it is possible to prevent the ray not emitted through the first collimating hole 221 from causing damage to a person or an object located near the flying spot scanning apparatus.
In some embodiments, as shown in fig. 4, the flying spot scanning apparatus further includes a collimator 40 disposed between the radiation source 10 and the flying spot forming device 20, the collimator 40 includes a collimator body 41, the collimator body 41 is provided with a second collimating hole 411, and the radiation emitted from the radiation source 10 is emitted through the second collimating hole 411.
The collimator 40 may confine the radiation in an elongated narrow fan-shaped passage. The collimator 40 may be made of lead or a lead-antimony alloy.
The swivel ring 22 is provided with two ring grooves 222, a boss 223 is formed between the two ring grooves 222, the first collimating hole 221 is arranged on the boss 223, the radially outer end of the collimator body 41 is provided with a groove 412, the boss 223 is inserted into the groove 412, the radially outer end of the collimator body 41 is inserted into the ring groove 222, and the first radially outer end face 225 of the boss 223 is closer to the axis of the carrier disc 21 than the second radially outer end face 413 of the collimator body 41.
In this embodiment, the swivel 22 moves circumferentially around the collimator 40 with a first clearance between the first radially outer end surface 225 of the boss 223 and the bottom of the groove 412 and a second clearance between the second radially outer end surface 413 and the bottom of the groove 222. Thus, by the rotation of the bearing disc 21 and the rotary ring 22, the ray fan-shaped beam can be further modulated into a continuous pencil-shaped beam, and the ray leakage can be effectively prevented. The swivel can be made of tungsten or tungsten-nickel-iron alloy with good radiation protection and mechanical property.
The groove bottom and walls of groove 412 and the groove bottom and walls of groove 222 form the shielding structure described above. Rays not emitted through the first collimating holes 221 are reflected when encountering the groove bottom and the groove wall of the groove 412 or the groove bottom and the groove wall of the ring groove 222, and the energy is gradually weakened in the reflection process, so that the shielding purpose is achieved.
In some embodiments, the swivel 22 includes an annular body and an adjustment block 224, the adjustment block 224 is detachably mounted on the annular body, the first collimating hole 221 is disposed on the adjustment block 224, and the diameter of the first collimating hole 221 is gradually reduced along the emitting direction of the ray. This may further enhance the collimating effect of the first collimating holes 221.
The adjustment block 224 is removably mounted on the annular body, so that it is possible to replace adjustment blocks having first alignment holes 221 of different sizes according to different requirements.
In some embodiments, the inner wall of the carrier plate 21 is provided with a limiting structure for limiting the rotation ring 22.
As shown in fig. 1, the limiting structure includes a stopper 25 disposed on the inner wall of the carrier tray 21, and the stopper 25 is disposed on a side of the rotary ring 22 close to the driving device 30 for stopping the stopper 25 from moving toward the driving device 30.
The limiting structure further comprises a pressing ring 23 and a connecting piece (such as a bolt 24), the pressing ring 23 is mounted on the bearing disc 21 through the connecting piece, and the pressing ring 23 is located on one side of the rotating ring 22 away from the driving device 30 and used for blocking the stop 25 from moving in a direction away from the driving device 30.
The swivel 22 can be axially restrained by the stopper 25 and the pressing ring 23.
In some embodiments, the pressing ring 23 is provided with a bump 26, the bump 26 is fixedly mounted on a side of the pressing ring 23 away from the driving device 30, or the bump 26 is integrally formed with the pressing ring 23. By providing the bumps 26, the rotation angle of the carrier tray 21 can be measured by detecting the positions of the bumps 26.
In some embodiments, the carrier plate 21 comprises a cylindrical portion, the radiation source 10 is arranged in the center of the cylindrical portion, the cylindrical portion is provided with a third collimation hole 211 communicating with the first collimation hole 221, and the axis of the third collimation hole 211 extends in the radial direction of the carrier plate 21.
As shown in fig. 1, the radiation emitted from the radiation source 10 is primarily collimated by the second collimating hole 411 of the collimator 40, secondarily collimated by the first collimating hole 221 of the rotary ring 22, and emitted radially through the third collimating hole 211 of the carrier plate 21. In this embodiment, the probe is disposed radially outward of the carrier plate 21.
As shown in fig. 5 and 6, in some embodiments, the flying spot forming device 20 includes a carrier plate 21, the radiation source 10 is disposed on an axial side of the carrier plate 21, the carrier plate 21 is provided with a third collimating hole 211, and an axis of the third collimating hole 211 extends along an axial direction of the carrier plate 21. In these embodiments, the radiation emitted by the radiation source 10 forms a sector 11, which is axially emitted through the third collimating aperture 211 under the action of the rotation of the carrier disc 21. The detector may be arranged on the axial side of the carrier disc 21.
In some embodiments, the drive device 30 further includes a drive assembly 34.
The driving assembly 34 includes a control unit 341, and the control unit 341 controls the output power and the torque of the driving device 30 by using a frequency conversion technology and a microelectronic technology, so as to achieve the purpose of speed regulation.
The driving assembly 34 further includes a magnetic ring 342 and a sensor 343, the magnetic ring 342 and the sensor 343 may form a hollow shaft incremental encoder, and speed feedback and position signal transmission of the first rotating shaft 321 may be achieved by detecting the position of the protrusion 26 on the pressing ring 23. The magnetic ring 342 is internally provided with periodic magnetic grid bars, and is installed on the first rotating shaft 321 through inner circle centering. The sensor 343 is a magneto-electric sensor and is securely mounted to the cover 336 by the bracket 344. When the first rotating shaft 321 drives the magnetic ring 342 to rotate, the sensor 343 and the magnetic ring 342 generate relative motion, and can output a detection signal by using a magnetoelectric induction principle.
The driving assembly 34 further includes an electrical plug 345 disposed on the housing 301 for connecting power and communication cables inside and outside the housing 301, thereby achieving good driving and precise control of the driving device 30.
In some embodiments, the flying spot scanning apparatus further comprises a base 50, and the driving apparatus 30 is mounted on the base 50 to ensure the stability of the driving apparatus 30.
Through the description of a plurality of embodiments of the flying spot scanning device, the embodiment of the flying spot scanning device organically integrates the direct-drive motor and the flying spot forming device, shortens the length of a transmission chain of the flying spot scanning device to zero, omits intermediate transmission links such as belt pulleys or couplings, and the like, has high energy conversion efficiency and control precision, simple, stable and reliable structure, effectively inhibits the volume and weight, and is beneficial to saving the cost. In addition, a high-quality continuous X-ray pencil beam can be generated, the flying spot scanning device is used as a modularized device, the development period of back scattering series products can be shortened, the use flexibility is improved, and the application prospect is good. A fan is further arranged in the shell to realize a forced heat dissipation channel, and effective cooling of the motor heating source is realized.
Based on the flying spot scanning device, the invention further provides a back scattering safety detection system, which comprises a detector and the flying spot scanning device, wherein the detector is used for receiving the ray reflected by the ray emitted by the flying spot scanning device after irradiating the object to be detected.
The backscatter security detection system may further comprise another detector for receiving radiation transmitted by the object after the radiation emitted by the flying spot scanning device is irradiated on the object.
The positive technical effects of the flying spot scanning device in the above embodiments are also applicable to the backscatter security detection system, and are not described herein again.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made without departing from the principles of the invention, and these modifications and equivalents are intended to be included within the scope of the claims.
Claims (16)
1. A flying spot scanning apparatus, comprising:
a radiation source (10) for emitting radiation;
a flying spot forming device (20) configured to process the rays emitted by the ray source (10) into a continuously emerging punctiform beam; and
a driving device (30) configured to drive the flying spot forming device (20) to rotate relative to the radiation source (10), wherein the driving device (30) comprises a stator assembly (31) and a rotor assembly (32) rotationally connected with the stator assembly (31), and the flying spot forming device (20) abuts against the rotor assembly (32) and is connected with the rotor assembly (32).
2. The flying spot scanning device according to claim 1, wherein the stator assembly (31) comprises a stator core (311) and a stator winding (312) wound on the stator core (311), the rotor assembly (32) comprises a first rotating shaft (321), a rotor core (322) mounted on the first rotating shaft (321), and a permanent magnet (323) mounted on the rotor core (322), and the flying spot forming device (20) abuts against an end of the first rotating shaft (321) and is connected with the first rotating shaft (321).
3. The flying spot scanning device according to claim 1, wherein the drive device (30) further comprises a housing (301), the stator assembly (31) and the rotor assembly (32) both being disposed within the housing (301), the housing (301) having a fluid passage therein configured to allow fluid circulating therein to cool the stator assembly (31) and the rotor assembly (32).
4. The flying spot scanning device according to claim 3, wherein the driving device (30) further includes a housing (351) mounted on the housing (301) and a first fan (352) disposed inside the housing (351), an exhaust chamber (359) formed inside the housing (351) communicates with an outlet of the fluid passage, and a circumferential side surface of the housing (351) is provided with an air outlet (353) so that the fluid inside the housing (351) flows out in a radial direction of the first fan (352).
5. The flying spot scanning device according to claim 4, wherein the stator assembly (31) is mounted to an inner wall of the housing (301), the rotor assembly (32) is disposed in a central through hole of the stator assembly (31), the rotor assembly (32) comprises a first rotating shaft (321), and the fluid passage comprises a first passage (354) disposed on the first rotating shaft (321).
6. The flying spot scanning device according to claim 5, wherein the driving device (30) further comprises a first fan (352), the first fan (352) comprises a second rotating shaft and a blade mounted on the second rotating shaft, the fluid passage comprises a second passage (355) provided on the second rotating shaft, and the second rotating shaft is connected with the first rotating shaft (321) so that the first passage (354) is communicated with the second passage (355).
7. The flying spot scanning device according to claim 4, wherein the fluid passage further comprises a third passage (356) disposed between the stator assembly (31) and the rotor assembly (32), an outlet of the third passage (356) being in communication with the exhaust chamber (359).
8. The flying spot scanning device according to claim 3, wherein the driving device (30) further comprises a second fan (357) arranged upstream of the inlet of the fluid channel.
9. Flying spot scanning device according to claim 1, wherein the flying spot forming device (20) comprises a carrier disc (21) and a swivel (22) mounted on the carrier disc (21), the carrier disc (21) abutting against the rotor assembly (32) and being connected with the rotor assembly (32), the swivel (22) being provided with a first collimating aperture (221), the first collimating aperture (221) being configured to process the radiation emitted by the radiation source (10) into a continuous flying spot when the swivel (22) rotates with the carrier disc (21) relative to the radiation source (10).
10. Flying spot scanning device according to claim 9, characterized in that the swivel (22) is provided with a shielding structure shielding the radiation not emitted through the first collimating aperture (221).
11. The flying spot scanning device according to claim 10, further comprising a collimator (40) disposed between the radiation source (10) and the flying spot forming device (20), wherein the collimator (40) comprises a collimator body (41), the collimator body (41) is provided with a second collimating hole (411), the radiation emitted from the radiation source (10) is emitted through the second collimating hole (411), the swivel ring (22) is provided with two ring grooves (222), a boss (223) is formed between the two ring grooves (222), the first collimating hole (221) is disposed on the boss (223), the radially outer end of the collimator body (41) is provided with a groove (412), the boss (223) is inserted into the groove (412), the radially outer end of the collimator body (41) is inserted into the ring groove (222), and the first radially outer end surface (225) of the boss (223) is larger than the second radially outer end surface (225) of the collimator body (41) The outer end face (413) is closer to the axis of the carrier disc (21).
12. The flying spot scanning device according to claim 9, wherein the swivel (22) comprises an annular body and an adjusting block (224), the adjusting block (224) is detachably mounted on the annular body, the first collimating hole (221) is provided on the adjusting block (224), and a diameter of the first collimating hole (221) is gradually reduced along an emitting direction of the ray.
13. The flying spot scanning device according to claim 9, wherein the inner wall of the carrier disc (21) is provided with a limiting structure for limiting the rotating ring (22).
14. Flying spot scanning device according to any one of claims 9-13, wherein the carrier disc (21) comprises a cylindrical part, the radiation source (10) being arranged in the center of the cylindrical part, the cylindrical part being provided with a third collimating aperture (211) communicating with the first collimating aperture (221), and the axis of the third collimating aperture (211) extending in a radial direction of the carrier disc (21).
15. The flying spot scanning device according to any one of claims 1 to 8, wherein the flying spot forming device (20) comprises a carrier plate (21), the radiation source (10) is disposed on an axial side of the carrier plate (21), the carrier plate (21) is provided with a third collimating hole (211), and an axis of the third collimating hole (211) extends along an axial direction of the carrier plate (21).
16. A backscatter security detection system comprising a detector and a flying spot scanning device as claimed in any one of claims 1 to 15, the detector being arranged to receive radiation reflected from an object irradiated with radiation emitted by the flying spot scanning device.
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| CN202010579159.9A CN113835129B (en) | 2020-06-23 | 2020-06-23 | Flying spot scanning device and back scattering safety detection system |
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| CN202010579159.9A CN113835129B (en) | 2020-06-23 | 2020-06-23 | Flying spot scanning device and back scattering safety detection system |
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| CN113835129B (en) | 2023-03-24 |
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