CN111781652B - Ray shielding device, ray source and ray inspection equipment - Google Patents
Ray shielding device, ray source and ray inspection equipment Download PDFInfo
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- CN111781652B CN111781652B CN202010612832.4A CN202010612832A CN111781652B CN 111781652 B CN111781652 B CN 111781652B CN 202010612832 A CN202010612832 A CN 202010612832A CN 111781652 B CN111781652 B CN 111781652B
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- 238000007689 inspection Methods 0.000 title claims abstract description 76
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 230000005855 radiation Effects 0.000 claims description 124
- 230000001681 protective effect Effects 0.000 claims description 49
- 230000033001 locomotion Effects 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 17
- 230000004888 barrier function Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 238000004378 air conditioning Methods 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 239000000835 fiber Substances 0.000 claims 1
- 230000002285 radioactive effect Effects 0.000 description 20
- 230000036541 health Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 13
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- 229920000049 Carbon (fiber) Polymers 0.000 description 8
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- 238000001514 detection method Methods 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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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
- G01N23/02—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 transmitting the radiation through the material
- G01N23/04—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 transmitting the radiation through the material and forming images of the material
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
- G21G4/00—Radioactive sources
- G21G4/04—Radioactive sources other than neutron sources
- G21G4/06—Radioactive sources other than neutron sources characterised by constructional features
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Abstract
The invention relates to the technical field of radiographic inspection equipment, in particular to a radiographic shielding device, a radiographic source and radiographic inspection equipment. The ray shielding device of the present invention comprises: a fixed bottom plate; a control module; the driving module is arranged on the fixed bottom plate and is in controlled connection with the control module; the shielding block is in transmission connection with the driving module and can be driven by the driving module to act; the fixed bottom plate is provided with a ray channel for the rays emitted by the ray source to pass through, and the shielding block can be positioned at a position which is matched with the ray channel to shield the rays so as to reduce the ray scanning dosage when being driven by the driving module to act, and can be positioned at a position which is away from the ray channel so as to allow the rays to pass through. When the ray inspection equipment scans the vehicle, the function can adopt different irradiation doses for different parts of the vehicle, thereby ensuring the personal safety of a driver and realizing the safety inspection of a cab.
Description
Technical Field
The invention relates to the technical field of radiographic inspection equipment, in particular to a radiographic shielding device, a radiographic source and radiographic inspection equipment.
Background
In customs, airports, wharfs and other places, large-scale radiographic inspection equipment is often used for carrying out security inspection on goods coming and going. The existing radiographic inspection equipment is various in form and has fixed type and movable type. The fixed type radiographic inspection equipment is fixed relative to the ground, inspected goods need to be dragged by the vehicle or the moving rail to pass through the inspection channel, and the movable type radiographic inspection equipment can automatically move to scan the inspected goods.
In order to improve the security inspection efficiency, the conventional fixed type radiographic inspection equipment is mostly used, and a driver drives a vehicle carrying inspected goods to pass through an inspection channel during inspection. In order to ensure the personal health and safety of drivers, the radiation inspection device of the type always performs radiation scanning after the drivers cab passes through the radiation irradiation position of the inspection channel, but cannot inspect the drivers cab, so that a 'security inspection dead angle' or a 'security inspection blind area' is generated, and the problem of the port, customs and public security authorities is gradually caused when the drivers cab is hidden with forbidden articles.
Therefore, the technical staff also put forward to scan the cab through the ray of lower dose, can carry on the security inspection to the cab under the precondition of guaranteeing the health and security of the driver, meanwhile, after the cab passes the ray scanning surface, raise the radiation dose of the ray through the control program set in advance, carry on the ray to the car body position and goods of the rear side of the vehicle cab, but the ray dose to scan the cab is required to be more severe, usually under 0.25uSv, is 1/40 to 1/200 of the ray dose while scanning the goods, and the parameter range of the accelerator work of the industrial product grade is narrower, it is very difficult to realize, even overcome this difficulty in addition, with the present technology, make the accelerator resume from the low dose mode to the time that the normal scanning mode through the program control, often in order of seconds, add the speed of vehicle that is detected, such time will influence the quality of the scanning image greatly, therefore this kind of mode has no practical significance. Therefore, how to realize the radiographic inspection of the detected vehicle cab on the premise of ensuring the health and safety of the driver becomes a difficult problem in the field of security inspection.
Disclosure of Invention
The invention aims to provide a ray shielding device which solves the problem that the existing ray inspection equipment cannot conduct ray inspection on a cab on the premise of ensuring the health and safety of a driver when inspecting a vehicle.
The invention also aims to provide a radiation source which solves the problem that the existing radiation inspection equipment cannot conduct radiation inspection on a cab on the premise of ensuring the health and safety of a driver when inspecting a vehicle.
In addition, the invention also aims to provide a ray inspection device for a staff, which is used for solving the problem that the existing ray inspection device cannot carry out ray inspection on a cab on the premise of ensuring the health and safety of the driver when the vehicle is inspected.
The technical scheme of the ray shielding device is as follows:
the ray shielding device comprises:
a fixed bottom plate; a control module; the driving module is arranged on the fixed bottom plate and is in controlled connection with the control module;
the shielding block is in transmission connection with the driving module and can be driven by the driving module to act;
the fixed bottom plate is provided with a ray channel for the rays emitted by the ray source to pass through, and the shielding block can be positioned at a position which is matched with the ray channel to shield the rays so as to reduce the ray scanning dosage when being driven by the driving module to act, and can be positioned at a position which is away from the ray channel so as to allow the rays to pass through.
The ray shielding device can be driven by the driving module controlled by the control module to act when in use, and can shield rays emitted by the ray source or let the rays emitted by the ray source open, thereby realizing the dosage adjustment of the rays emitted by the ray source. The function can reduce the radiation dose of the scanning cab through shielding the rays by the shielding block when the ray inspection equipment scans the vehicle and adopts different irradiation doses for different parts of the vehicle, namely, when the cab is scanned, the safety inspection of the cab is realized on the premise of ensuring the health and safety of a driver; after the cab passes through the scanning ray surface, the shielding block is removed, so that the ray dosage for scanning the vehicle part at the rear side of the cab is correspondingly increased, and the safety inspection of the carriage or the vehicle-mounted goods can be accurately performed.
Further, a ray protection structure is arranged on the fixed bottom plate beside the shielding block and used for shielding particles scattered when rays pass through the shielding block. The ray protection structure can prevent scattering particles from flying around when rays pass through the shielding block, and damage is caused to other electrical components or inspection operators.
Further, the ray protection structure is a shielding plate fixedly arranged on the fixed bottom plate. The shielding plate has simple and regular structure, is convenient to assemble and disassemble, and is convenient to reasonably arrange with other installation components on the fixed bottom plate.
Further, the ray protection structure is arranged at two sides of the shielding block and is positioned at two sides of the ray surface in use. The ray protection structure is arranged on two sides of the shielding block, so that scattering particles can be effectively shielded on the basis of simplifying the protection structure and reducing the weight of the device, and better protection is achieved.
Further, the driving module and the control module are both arranged on one side of the shielding plate, which is away from the shielding block. Therefore, the shielding plate can protect the electric components of the driving module and the control module, so that the interference of scattering particles is avoided, and the reliability of the action of the shielding block is ensured.
Further, the ray shielding device further comprises a protective shell, the protective shell is arranged on the fixed bottom plate and covers the shielding block, the driving module and the control module inside, a ray avoiding area for a ray to pass through is arranged on the protective shell, and the ray avoiding area is formed in at least three different modes: firstly, a gap is arranged on the protective shell at a position corresponding to a ray surface, and the gap forms the ray avoiding area; secondly, a gap is arranged on the protective shell at a position corresponding to the ray surface, a low-barrier material is complemented at the gap position for the ray to pass through, and a region corresponding to the low-barrier material forms the ray avoiding region; thirdly, the protective shell is made of low-barrier material, and a ray avoiding area is formed in an area corresponding to the ray on the protective shell. The control module, the driving module and the shielding block on the fixed bottom plate can be covered inside by the protective shell, the appearance of the device is of a closed integral structure, the inside electric components are well protected from dust and water, and meanwhile, the shielding block moving inside can not be interfered by the outside.
Still further, the low barrier material is carbon fiber. The carbon fiber has weaker blocking effect on the rays, can enable the rays to pass through basically without damage, ensures that the rays are inspected and scanned in a required dosage, and ensures the security inspection effect.
On the basis of the scheme, the driving module can be further improved to obtain an optimized scheme, namely, the driving module outputs reciprocating linear motion, the movable guide rail is arranged on the fixed bottom plate, the shielding block is arranged on the movable guide rail in a guiding and moving mode, and the driving module drives the shielding block to reciprocate linear motion on the movable guide rail. The reciprocating linear motion makes the reciprocating motion stroke of the shielding block between two positions equal and as short as possible, so that the switching speed of the shielding block between the two positions is increased as much as possible, the driving module only needs to provide the power for moving the shielding block, the driving module is not required to bear the weight of the shielding block, the load requirement of the driving module is reduced, the moving speed of the shielding block is improved, the safety inspection of other parts of the vehicle is ensured by adjusting the scanning dosage as soon as possible after the cab is scanned in the running process of the detected vehicle, the safety inspection effect is ensured, and the imaging effect of the ray inspection equipment is improved.
Further preferably, the movable guide rail is provided with a linear bearing, and the shielding block is fixed on the linear bearing through a connecting piece. The friction coefficient between the linear bearing and the movable guide rail is smaller, the shielding block is arranged on the movable guide rail through the linear bearing, the friction resistance during the linear reciprocating movement of the shielding block is smaller, the output load of the driving module is smaller, and the high-speed movement is easier to realize.
In addition, according to a further preferred embodiment of the invention, the radiation-emitting end of the shielding block protrudes into the radiation channel of the fixing base plate. Therefore, the shielding block is as close to the radioactive source as possible, and the radiation surface area is smaller as the shielding block is closer to the radioactive center of the radioactive source, so that the size of the shielding block is smaller, the self weight of the shielding block is reduced, and the moving speed of the shielding block can be improved.
Further, the ray channel is a through hole formed in the fixed bottom plate, and the end face of one end of the shielding block extending into the ray channel is sunk into the plate surface of the fixed bottom plate. The fixed bottom plate structure is simple and regular, easy to assemble, shelter from the one end of stretching into in the ray passageway and sink in the face, can not expose the face under the prerequisite that is close to the radiation source as far as, avoid producing with external structure when its removal and interfere.
Further, at least one of the upper and lower sides of the shielding block is integrally inclined and extends along the edge of the ray surface in use. The shielding block with the structure reduces the volume as much as possible and reduces the weight as much as possible under the premise of ensuring that the ray can be shielded, so that the movement speed of the shielding block is increased as much as possible.
The technical proposal of the radiation source for the radiation inspection equipment is as follows:
a radiation source for a radiation inspection device includes:
the radiation source and the ray shielding device are arranged at the ray emission position of the radiation source;
the ray shielding device comprises:
a fixed bottom plate; a control module; the driving module is arranged on the fixed bottom plate and is in controlled connection with the control module;
the shielding block is in transmission connection with the driving module and can be driven by the driving module to act;
the fixed bottom plate is provided with a ray channel for the rays emitted by the ray source to pass through, the shielding block can be positioned at the position which is matched with the ray channel to shield the rays and reduce the ray scanning dosage when driven by the driving module to act, and can be positioned at the position which is away from the ray channel to allow the rays to pass through, and the adjustment of the ray dosage emitted by the ray source is realized when the shielding block of the ray shielding device shields and is away from the rays.
When the ray source is used, the emitted ray can be shielded or the ray can be opened by the action of the shielding block of the ray shielding device, so that the ray emitted by the ray source is subjected to dose adjustment. The function can reduce the radiation dose of the scanning cab through shielding the rays by the shielding block when the ray inspection equipment scans the vehicle and adopts different irradiation doses for different parts of the vehicle, namely, when the cab is scanned, the safety inspection of the cab is realized on the premise of ensuring the health and safety of a driver; after the cab passes through the scanning ray surface, the shielding block is removed, so that the ray dosage for scanning the vehicle part at the rear side of the cab is correspondingly increased, and the safety inspection of the carriage or the vehicle-mounted goods can be accurately performed.
Further, a ray protection structure is arranged on the fixed bottom plate beside the shielding block and used for shielding particles scattered when rays pass through the shielding block. The ray protection structure can prevent scattering particles from flying around when rays pass through the shielding block, and damage is caused to other electrical components or inspection operators.
Further, the ray protection structure is a shielding plate fixedly arranged on the fixed bottom plate. The shielding plate has simple and regular structure, is convenient to assemble and disassemble, and is convenient to reasonably arrange with other installation components on the fixed bottom plate.
Further, the ray protection structure is arranged at two sides of the shielding block and is positioned at two sides of the ray surface in use. The ray protection structure is arranged on two sides of the shielding block, so that scattering particles can be effectively shielded on the basis of simplifying the protection structure and reducing the weight of the device, and better protection is achieved.
Further, the driving module and the control module are both arranged on one side of the shielding plate, which is away from the shielding block. Therefore, the shielding plate can protect the electric components of the driving module and the control module, so that the interference of scattering particles is avoided, and the reliability of the action of the shielding block is ensured.
Further, the ray shielding device further comprises a protective shell, the protective shell is arranged on the fixed bottom plate and covers the shielding block, the driving module and the control module inside, a ray avoiding area for rays to pass through is arranged on the protective shell, and the ray avoiding area is formed in at least three modes: firstly, a gap is arranged on the protective shell at a position corresponding to a ray surface, and the gap forms the ray avoiding area; secondly, a gap is arranged on the protective shell at a position corresponding to the ray surface, a low-barrier material is complemented at the gap position for the ray to pass through, and a region corresponding to the low-barrier material forms the ray avoiding region; thirdly, the protective shell is made of low-barrier material, and a ray avoiding area is formed in an area corresponding to the ray on the protective shell. The control module, the driving module and the shielding block on the fixed bottom plate can be covered inside by the protective shell, the appearance of the device is of a closed integral structure, the inside electric components are well protected from dust and water, and meanwhile, the shielding block moving inside can not be interfered by the outside.
Still further, the low barrier material is carbon fiber. The carbon fiber has weaker blocking effect on the rays, can enable the rays to pass through basically without damage, ensures that the rays are inspected and scanned in a required dosage, and ensures the security inspection effect.
On the basis of the scheme, the driving module can be further improved to obtain an optimized scheme, namely, the driving module outputs reciprocating linear motion, the movable guide rail is arranged on the fixed bottom plate, the shielding block is arranged on the movable guide rail in a guiding and moving mode, and the driving module drives the shielding block to reciprocate linear motion on the movable guide rail. The reciprocating linear motion makes the reciprocating motion stroke of the shielding block between two positions equal and as short as possible, so that the switching speed of the shielding block between the two positions is increased as much as possible, the driving module only needs to provide the power for moving the shielding block, the driving module is not required to bear the weight of the shielding block, the load requirement of the driving module is reduced, the moving speed of the shielding block is improved, the safety inspection of other parts of the vehicle is ensured by adjusting the scanning dosage as soon as possible after the cab is scanned in the running process of the detected vehicle, the safety inspection effect is ensured, and the imaging effect of the ray inspection equipment is improved.
Further preferably, the movable guide rail is provided with a linear bearing, and the shielding block is fixed on the linear bearing through a connecting piece. The friction coefficient between the linear bearing and the movable guide rail is smaller, the shielding block is arranged on the movable guide rail through the linear bearing, the friction resistance during the linear reciprocating movement of the shielding block is smaller, the output load of the driving module is smaller, and the high-speed movement is easier to realize.
In addition, according to a further preferred embodiment of the invention, the radiation-emitting end of the shielding block protrudes into the radiation channel of the fixing base plate. Therefore, the shielding block is as close to the radioactive source as possible, and the radiation surface area is smaller as the shielding block is closer to the radioactive center of the radioactive source, so that the size of the shielding block is smaller, the self weight of the shielding block is reduced, and the moving speed of the shielding block can be improved.
Further, the ray channel is a through hole formed in the fixed bottom plate, and the end face of one end of the shielding block extending into the ray channel is sunk into the plate surface of the fixed bottom plate. The fixed bottom plate structure is simple and regular, easy to assemble, shelter from the one end of stretching into in the ray passageway and sink in the face, can not expose the face under the prerequisite that is close to the radiation source as far as, avoid producing with external structure when its removal and interfere.
Further, at least one of the upper and lower sides of the shielding block is integrally inclined and extends along the edge of the ray surface in use. The shielding block with the structure reduces the volume as much as possible and reduces the weight as much as possible under the premise of ensuring that the ray can be shielded, so that the movement speed of the shielding block is increased as much as possible.
Furthermore, the radiation source comprises a housing, in which the radiation shielding device is integrated. At this time, the appearance of ray source is monolithic structure, and the degree of integration of ray source is higher, more is favorable to realizing less volume.
The technical scheme of the radiographic inspection equipment is as follows:
the radiographic inspection apparatus includes: a radiation source; a collimator; and a detector array with radiation sources arranged opposite each other;
the radiation inspection device further includes a radiation shielding arrangement disposed between the radiation source and the collimator, the radiation shielding arrangement comprising: a fixed bottom plate; a control module; the driving module is arranged on the fixed bottom plate and is in controlled connection with the control module; the shielding block is in transmission connection with the driving module and can be driven by the driving module to act;
the fixed bottom plate is provided with a ray channel for the rays emitted by the ray source to pass through, and the shielding block can be positioned at a position which is matched with the ray channel to shield the rays so as to reduce the ray scanning dosage when being driven by the driving module to act, and can be positioned at a position which is away from the ray channel so as to allow the rays to pass through.
The ray shielding device of the ray inspection equipment can be driven by the driving module controlled by the control module to act when in use, and can shield rays emitted by the ray source or let the rays emitted by the ray source open, thereby realizing the dosage adjustment of the rays emitted by the ray source. When the ray inspection equipment scans the vehicle, different irradiation doses are adopted for different parts of the vehicle, namely, when the cab is scanned, the ray dose of the scanned cab can be reduced by shielding rays by the shielding block, and the safety inspection of the cab is realized on the premise of ensuring the health and safety of a driver; after the cab passes through the scanning ray surface, the shielding block is removed, so that the ray dosage for scanning the vehicle part at the rear side of the cab is correspondingly increased, and the safety inspection of the carriage or the vehicle-mounted goods can be accurately performed.
Further, a ray protection structure is arranged on the fixed bottom plate beside the shielding block and used for shielding particles scattered when rays pass through the shielding block. The ray protection structure can prevent scattering particles from flying around when rays pass through the shielding block, and damage is caused to other electrical components or inspection operators.
Further, the ray protection structure is a shielding plate fixedly arranged on the fixed bottom plate. The shielding plate has simple and regular structure, is convenient to assemble and disassemble, and is convenient to reasonably arrange with other installation components on the fixed bottom plate.
Further, the ray protection structure is arranged at two sides of the shielding block and is positioned at two sides of the ray surface in use. The ray protection structure is arranged on two sides of the shielding block, so that scattering particles can be effectively shielded on the basis of simplifying the protection structure and reducing the weight of the device, and better protection is achieved.
Further, the driving module and the control module are both arranged on one side of the shielding plate, which is away from the shielding block. Therefore, the shielding plate can protect the electric components of the driving module and the control module, so that the interference of scattering particles is avoided, and the reliability of the action of the shielding block is ensured.
Further, the ray shielding device further comprises a protective shell, the protective shell is arranged on the fixed bottom plate and covers the shielding block, the driving module and the control module inside, a ray avoiding area for a ray to pass through is arranged on the protective shell, and the ray avoiding area is formed in at least three different modes: firstly, a gap is arranged on the protective shell at a position corresponding to a ray surface, and the gap forms the ray avoiding area; secondly, a gap is arranged on the protective shell at a position corresponding to the ray surface, a low-barrier material is complemented at the gap position for the ray to pass through, and a region corresponding to the low-barrier material forms the ray avoiding region; thirdly, the protective shell is made of low-barrier material, and a ray avoiding area is formed in an area corresponding to the ray on the protective shell. The control module, the driving module and the shielding block on the fixed bottom plate can be covered inside by the protective shell, the appearance of the device is of a closed integral structure, the inside electric components are well protected from dust and water, and meanwhile, the shielding block moving inside can not be interfered by the outside.
Still further, the low barrier material is carbon fiber. The carbon fiber has weaker blocking effect on the rays, can enable the rays to pass through basically without damage, ensures that the rays are inspected and scanned in a required dosage, and ensures the security inspection effect.
On the basis of the scheme, the driving module can be further improved to obtain an optimized scheme, namely, the driving module outputs reciprocating linear motion, the movable guide rail is arranged on the fixed bottom plate, the shielding block is arranged on the movable guide rail in a guiding and moving mode, and the driving module drives the shielding block to reciprocate linear motion on the movable guide rail. The reciprocating linear motion makes the reciprocating motion stroke of the shielding block between two positions equal and as short as possible, so that the switching speed of the shielding block between the two positions is increased as much as possible, the driving module only needs to provide the power for moving the shielding block, the driving module is not required to bear the weight of the shielding block, the load requirement of the driving module is reduced, the moving speed of the shielding block is improved, the safety inspection of other parts of the vehicle is ensured by adjusting the scanning dosage as soon as possible after the cab is scanned in the running process of the detected vehicle, the safety inspection effect is ensured, and the imaging effect of the ray inspection equipment is improved.
Further preferably, the movable guide rail is provided with a linear bearing, and the shielding block is fixed on the linear bearing through a connecting piece. The friction coefficient between the linear bearing and the movable guide rail is smaller, the shielding block is arranged on the movable guide rail through the linear bearing, the friction resistance during the linear reciprocating movement of the shielding block is smaller, the output load of the driving module is smaller, and the high-speed movement is easier to realize.
In addition, according to a further preferred embodiment of the invention, the radiation-emitting end of the shielding block protrudes into the radiation channel of the fixing base plate. Therefore, the shielding block is as close to the radioactive source as possible, and the radiation surface area is smaller as the shielding block is closer to the radioactive center of the radioactive source, so that the size of the shielding block is smaller, the self weight of the shielding block is reduced, and the moving speed of the shielding block can be improved.
Further, the ray channel is a through hole formed in the fixed bottom plate, and the end face of one end of the shielding block extending into the ray channel is sunk into the plate surface of the fixed bottom plate. The fixed bottom plate structure is simple and regular, easy to assemble, shelter from the one end of stretching into in the ray passageway and sink in the face, can not expose the face under the prerequisite that is close to the radiation source as far as, avoid producing with external structure when its removal and interfere.
Further, at least one of the upper and lower sides of the shielding block is integrally inclined and extends along the edge of the ray surface in use. The shielding block with the structure reduces the volume as much as possible and reduces the weight as much as possible under the premise of ensuring that the ray can be shielded, so that the movement speed of the shielding block is increased as much as possible.
Drawings
FIG. 1 is a schematic view showing the appearance of a first embodiment of a covering device according to the present invention;
FIG. 2 is a schematic diagram of a hidden protective shell according to an embodiment of a radiation shielding apparatus of the present invention;
FIG. 3 is a cross-sectional view at A-A in FIG. 2;
FIG. 4 is a top view of the covering device of FIG. 2;
FIG. 5 is a schematic view of a structure of a shielding block;
in the figure: 1-fixing a bottom plate; 10-protecting a shell; 101-a slit; 102-a wire outlet bolt; 11-an electric cylinder server; 12-a shielding plate; 13-an electric cylinder; 14-a through-hole; 15-a shielding block; 150-upper side; 151-underside; 16-linear bearings; 17-moving the guide rail; 9-ray plane.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The features and capabilities of the present invention are described in further detail below in connection with the examples.
A specific embodiment of the radiation source of the present invention is:
the radiation source is mainly used for large-scale security inspection equipment, such as large-scale radiation inspection equipment for carrying out security inspection on a vehicle-mounted container or a large van, the detector arm support of the radiation inspection equipment and the radiation source are arranged at intervals relatively, a detection channel for a detected vehicle to pass through is formed between the detector arm support and the radiation source, the radiation source emits scanning rays to the detector on the detector arm support, the detected vehicle passes through the detection channel, and the scanning rays scan the whole vehicle of the detected vehicle. The security inspection mode is high in efficiency, does not have a security inspection dead angle or a security inspection dead zone, and is adopted by airports, wharfs and logistics freight centers.
Of course, such a safety inspection scanning method requires that the driver drives the vehicle through the detection channel, thus requiring that the radiation does not cause damage to the health and safety of the driver when scanning the cab. The radiation source of the present invention aims to solve such problems.
When the ray scans the vehicle-mounted goods, the goods can be accurately identified by a larger penetration distance, so that the ray dose is higher, and the high-dose ray can cause health and safety damage to a driver when irradiating the human body.
Specifically, the ray source comprises a ray shielding device, and the ray shielding device shields and avoids rays emitted by the ray source through a shielding block so as to adjust the dosage of the rays emitted by the ray source. The shielding block is made of high-density metal, so that rays can be weakened when rays are shielded, the radiation dose of the rays irradiating the detected vehicle is reduced, and high-energy rays emitted by the radiation source can be used for irradiating the detected vehicle without obstruction when the rays are yielded.
Structurally, the radiation source comprises a radiation source and a ray shielding device, wherein the radiation source can be a natural radiation source or an electron accelerator, the radiation source is provided with an outer housing, the ray shielding device is detachably arranged on the outer housing of the radiation source and corresponds to a ray emitting opening, and rays are shielded at a close range of the radiation source.
As shown in fig. 1 to 5, the ray shielding device comprises a fixed bottom plate 1 and a protective shell 10 detachably mounted on the fixed bottom plate 1, wherein the protective shell 10 is integrally in a box-shaped structure, and the protective shell 10 is connected with the fixed bottom plate 1 in a posture that an opening of the protective shell is opposite to the fixed bottom plate 1 so as to integrally form a completely closed box body. The fixed bottom plate 1 is fixedly provided with a control module and a driving module, wherein the driving module is an electric cylinder 13, the control module comprises an electric cylinder server 11, the fixed bottom plate 1 is also fixedly provided with a servo transformer and a movable guide rail 17, the movable guide rail 17 is a linear guide rail, a sliding bearing 16 is arranged on the movable guide rail, the sliding bearing 16 is fixedly connected with a shielding block 15 through a connecting piece, the shielding block 15 is connected with the linear output end of the electric cylinder 13, and the electric cylinder 13 moves in a reciprocating linear manner on the movable guide rail along with the shielding block, so that the shielding and avoiding of rays emitted by a radioactive source are realized.
The shielding blocks are high-density metal blocks which can effectively weaken the ray intensity, the weight is heavy, the movable guide rail is arranged and is in guide fit with the shielding blocks, the electric cylinder only needs to provide driving force for driving the shielding blocks to reciprocate, and the load required by the electric cylinder is reduced; in addition, the sliding bearing is arranged to greatly reduce the friction possibly existing between the shielding block and the movable guide rail during movement, so that the electric cylinder can drive the shielding block to move more easily, the moving speed of the shielding block is improved, the influence of the change of the ray dose on the scanning process is reduced, and the imaging quality of the ray inspection system is ensured. More optimally, in order to ensure stable movement of the shade block, as shown in fig. 2, in this embodiment, the two movable guide rails 17 are arranged at intervals, and guide and support the two ends of the shade block respectively, and correspondingly, the output end of the electric cylinder 13 is positioned between the two movable guide rails 17 and is connected with the middle part of the shade block.
Since the shielding block always scatters during the radiation irradiation and passing through the shielding block when shielding the radiation, the radiation particles fly away everywhere, which not only causes interference and damage to surrounding electrical components, but also causes damage to a certain extent to the health of staff, and therefore, the radiation protection structure is also arranged on the fixed bottom plate 1 around the shielding block 15. Specifically, in this embodiment, in order to make the movement speed of shielding the dog faster, lighten the weight and the reciprocating motion stroke of shielding the dog as far as possible, shielding the dog and playing the prerequisite of enough shielding the effect to the ray, the thickness often makes less, and when the ray shines shielding the dog like this, it is comparatively obvious at shielding the scattering of piece thickness direction, therefore ray protection architecture sets up in shielding the both sides of the thickness direction of dog, can play the effect to scattering particles shielding under the comparatively simple prerequisite of overall structure. In this embodiment, the ray protection structure adopts the shielding plates 12 located at two sides of the ray surface 9 and in parallel with the ray surface, the shielding plates 12 adopt lead plates, the moving guide rail is located between the two shielding plates 12, an avoidance gap is formed in one shielding plate 12, the output end of the electric cylinder 13 serving as the driving module passes through the avoidance gap and is connected with the shielding block 15, and the control module and the driving module are located at one side of the same shielding plate 13 and are protected by the shielding plate 13.
The fixed bottom plate 1 is provided with the through hole 14, the through hole 14 can enable rays emitted by the radioactive source to pass through as a ray channel, in this embodiment, one side of the shielding block 15, which is close to the radioactive source, i.e. one side penetrated by rays stretches into the through hole 14, and the length of the extending movement of the through hole 14 in the length direction of the moving guide rail can meet the requirement that the shielding block cannot interfere with the part of the shielding block, which stretches into the ray channel, when the shielding block moves in a reciprocating straight line, and the shielding block can be made to be close to the radioactive source as much as possible by the design. Because the ray surface 9 emitted by the radioactive source is emitted outwards at a certain included angle from the central point, the closer the ray surface is to the central point of the radioactive source, the smaller the volume of the shielding block is, so that the shielding block is extended into the ray channel to enable the shielding block to be as close to the radioactive source as possible, the size of the shielding block can be further reduced, the weight of the shielding block is reduced, and conditions are provided for the driving module to drive the shielding block to act faster.
When the ray shielding device is specifically used, the fixing bottom plate 1 can be directly clung to the outer cover shell of the radioactive source, so that the shielding block is closer to the radioactive source, at this time, in order to avoid interference when the shielding block reciprocates, as shown in fig. 3, one side of the shielding block 15, into which rays are injected, is submerged in the through hole 14, namely, is lower than the plate surface of the fixing bottom plate 1.
The ray shielding device of this embodiment further includes a more optimized technical solution to reduce the volume and weight of the shielding block, as shown in fig. 3, the upper and lower edges of the ray surface 9 emitted from the ray emitting port are inclined edges, the shielding block only needs to shield the ray surface, and correspondingly, the upper and lower edges of the shielding block 15, that is, the upper side 150 and the lower side 151, are also arranged in an inclined manner, and substantially coincide with the inclined edges of the ray surface; for the same consideration, the side edge of the shielding block, from which the rays are emitted, can be correspondingly designed according to the inclination angle of the ray surface, and only the penetrating thickness of the ray surface is required to be ensured to reduce the intensity of the scanning rays to be (for example, below 0.25 and uSv) harmless to human bodies.
In addition, when the radiation source is used, rays emitted by the radiation source pass through the ray shielding device, then pass through the collimator for collimation, and scan the inspected goods. In order to avoid scattering phenomena of the radiation during the passage of the radiation through the protective housing 10 and to avoid weakening of the scanning radiation dose due to the influence of the protective housing 10, a radiation avoidance region is provided on the protective housing 10 at a position corresponding to the radiation surface 9, through which the radiation passes relatively nondestructively. In this embodiment, for reliable protection, the protective shell 10 is made of metal, specifically, a stainless steel shell, a gap 101 is provided at a position corresponding to the ray surface 9 on the protective shell 10, a low-barrier material (such as a carbon fiber board or an aluminum board) is provided at the position of the gap 101 for passing the ray and blocking the gap 101, and the region corresponding to the low-barrier material forms the ray avoiding region. Of course, in this embodiment, in order to ensure the integrity of the protective shell and to seal the inner part in a dustproof and waterproof manner by adopting a low-barrier material, in other embodiments, similarly, under the condition that the dustproof and waterproof requirements are not strict, the slit can be directly exposed, the rays can directly pass through the slit, and at this time, the slit forms the ray avoiding area; still alternatively, in other embodiments, the protective shell may not be slit, so that the protective shell has better integrity, and the entire protective shell is made of a low-barrier material, for example, a carbon fiber protective shell, and the radiation directly passes through the protective shell without being affected, so that a radiation avoiding area is formed in an area corresponding to the radiation on the protective shell.
The example use shows that the shielding block is made of 45 steel, the thickness is about 50mm, and the weight is about 16.5Kg; parameters of the electric cylinder are required: rated thrust 100N, effective stroke 50mm, rated speed 2000mm/s, rated acceleration 20m/s 2 The method comprises the steps of carrying out a first treatment on the surface of the When the shielding block is used, the removing distance of the shielding block is about 26mm, and the pushing force required by moving the shielding block is about 25N. The shielding block is initially positioned at a shielding position, namely, the position for shielding the ray, the detected vehicle calculates according to the speed of 15Km/h, the shielding block moves away at the moment (about 72 milliseconds) after the current vehicle head is scanned, and before the current vehicle body is scanned, the next vehicle head starts to be scanned, the control module controls the driving module to drive the shielding block to reset.
The radiation source comprising the ray shielding device does not need to change the working parameters of the accelerator, adopts the mechanical device to realize the selective shielding of rays, has quick response, is simple and reliable, can realize the safety inspection of the detected vehicle in all directions on the premise of not damaging the personal health and safety of a driver, and has more accurate inspection structure.
Of course, the radiation source of the present invention is not limited to the above-described embodiments, and examples of other different variations are provided below.
In other embodiments, the radiation shielding device may not include a protective shell, but rather may be integrated directly into the housing of the radiation source, such that the radiation source is of unitary construction, in which case the housing of the radiation source functions in a manner that the protective shell functions as in the above-described embodiments.
In other embodiments, in the occasion that the protection requirement is higher, ray protection structure also can be for installing the rectangle barrel on fixed bottom plate, and the rectangle barrel encloses the shielding piece inside, and drive module's action end passes the rectangle barrel and stretches into inside and be connected with shielding piece, and ray protection structure protects shielding piece's periphery at this moment, prevents scattering particle flight.
In other embodiments, the ray protection structure may be a lead curtain, for example, a mounting frame is arranged on the outer side of the shielding block on the fixed bottom plate, and the lead curtain is fixedly mounted in a frame hole of the mounting frame; or a tungsten sheet is fixedly arranged on the outer side of the shielding block on the fixed bottom plate. In particular, regarding the installation position of the radiation protection structure, as in the structure of the protection shell in the first embodiment, if a side wall of the protection shell facing away from the driving module can play a role in preventing scattering particles from escaping through a change of a material, a shielding plate may be disposed only between the shielding block and the driving module, and between the shielding block and the control module. Or, if the whole ray shielding device is installed in the shell of the radioactive source, a ray protection structure is not required to be arranged at the moment, and the shell of the radioactive source can play a role in protection.
In other embodiments, the driving module and the control module may also be disposed on two sides of the shielding block, for example, the moving rail is disposed in a middle position of the fixed base plate, the shielding block is mounted on the moving rail, the shielding plate is mounted on two sides of the moving rail and the shielding block on the fixed base plate, the driving module is mounted on one side of the shielding plate facing away from the shielding block, and the control module is mounted on one side of the shielding plate facing away from the shielding block.
In other embodiments, the balls can be installed at the position of the shielding block facing the moving guide rail and are in rolling fit with the moving guide rail through the balls, and at the moment, the effect of reducing the friction force between the shielding block and the moving guide rail can be achieved, so that the shielding block is installed on the moving guide rail without the aid of a linear bearing.
Alternatively, in other embodiments, if the fixing base plate is made of a high-strength plate and has a relatively thin thickness, the shielding block may be completely located on one side of the fixing base plate, and the radiation passage on the fixing base plate may be only a slit, aligned with the radiation emitting opening of the radiation source, and aligned with the radiation avoiding area.
Still alternatively, in other embodiments, the upper and lower sides of the shielding block may not be disposed in an overall inclined manner, for example, the shielding block is rectangular overall, so that the shielding block has a regular overall structure and is convenient to process, the moving rail may be disposed on the upper and lower sides of the rectangular shielding block, and the shielding block is matched with the moving rail through the block portions on the upper and lower sides. The structure of the shielding block is not limited to the specific shape of the shielding block, and the design of the shielding block is determined according to actual use conditions.
Embodiments of the present invention of a covering device: the specific structure of the radiation source may be the same as that of the radiation shielding device in the various embodiments of the radiation source, and will not be described herein.
An embodiment of the radiographic inspection apparatus of the present invention: comprises a ray source, a collimator, a control system, a vehicle position detection system and a detector array. The radiation source and the detector array are arranged at intervals relatively, the collimator is arranged close to the radiation source, rays emitted by the radiation source are aligned to the detector array after passing through the collimator, a detection channel for a vehicle to be checked to pass through is formed between the detector array and the collimator, the radiation source is the radiation source in the above-mentioned embodiment and comprises a ray shielding device, and the vehicle position detection system is connected with a control module of the ray shielding device. When the vehicle position detection system detects that the vehicle cab passes through the ray surface, the control module sends out an instruction to prompt the driving module to drive the blocking block to instantaneously leave, the rays are not blocked, and the high-dose rays scan the rear side of the vehicle cab; after the vehicle completely leaves the detection channel, the control module sends out an instruction to drive the driving module to drive the shielding block to reset, and the vehicle returns to the position for shielding rays to wait for the following vehicle to drive.
The radiation source of the radiation inspection device may have the same structure as the radiation source described in the foregoing embodiment of the radiation source, and will not be described herein.
The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A radiation shielding device, comprising:
a fixed bottom plate;
a control module;
the driving module is arranged on the fixed bottom plate and is in controlled connection with the control module;
the shielding block is in transmission connection with the driving module and can be driven by the driving module to act;
the fixed bottom plate is provided with a ray channel for the rays sent by the ray source to pass through, when the stop block is driven by the driving module to act, the stop block can be positioned at the position which is matched with the ray channel to block the rays so as to reduce the ray scanning dosage, the stop block can be positioned at the position which is away from the ray channel for the rays to pass through, one end of the stop block, which is irradiated by the rays, extends into the ray channel of the fixed bottom plate, the ray channel is a penetrating orifice formed in the fixed bottom plate, and the end face of the stop block, which extends into one end of the ray channel, is submerged in the plate surface of the fixed bottom plate.
2. A radiation shielding device according to claim 1, wherein the fixed base plate is provided with a radiation protection structure beside the shielding block for shielding particles scattered when radiation passes through the shielding block.
3. A radiation shielding device according to claim 2, wherein the radiation protection structure is a shielding plate fixedly mounted on a fixed base plate.
4. A radiation shielding device according to claim 2, wherein the radiation protection structure is arranged on both sides of the shielding block and on both sides of the radiation surface in use.
5. A radiation shielding device according to claim 4, characterized in that the drive module and the control module are arranged on the side of the shielding plate facing away from the shielding block.
6. The device of any one of claims 1-5, further comprising a protective housing mounted on the fixed base plate and enclosing the shielding block, the drive module and the control module inside, wherein a radiation avoidance area through which radiation passes is provided on the protective housing, and the radiation avoidance area is formed in at least three different ways: firstly, a gap is arranged on the protective shell at a position corresponding to a ray surface, and the gap forms the ray avoiding area; secondly, a gap is arranged on the protective shell at a position corresponding to the ray surface, a low-barrier material is complemented at the gap position for the ray to pass through, and a region corresponding to the low-barrier material forms the ray avoiding region; thirdly, the protective shell is made of low-barrier material, and a ray avoiding area is formed in an area corresponding to the ray on the protective shell.
7. A covering device according to claim 6, wherein the low barrier material is carbon fibre.
8. The device according to any one of claims 1 to 5, wherein the driving module outputs a reciprocating linear motion, the fixed base plate is provided with a moving guide rail, the shielding block is mounted on the moving guide rail in a guiding manner, and the driving module drives the shielding block to reciprocate on the moving guide rail.
9. A radiation shielding device according to claim 8, characterized in that the moving rail is provided with a linear bearing, and the shielding block is fixed to the linear bearing by means of a connecting piece.
10. A radiation shielding device according to any one of claims 1 to 5, wherein at least one of the upper and lower sides of the shielding block is arranged to be inclined in its entirety and to extend along the edge of the radiation surface in use.
11. A radiation source, comprising:
the radiation source and the ray shielding device are arranged at the ray emission position of the radiation source;
the radiation shielding device is a radiation shielding device according to any one of claims 1-10, and the adjustment of the radiation dose emitted by the radiation source is realized when the shielding block of the radiation shielding device shields and lets out radiation.
12. The radiation source defined in claim 11, wherein the radiation source comprises a housing, and wherein the radiation shielding means is integrated in the housing.
13. A radiographic inspection apparatus comprising:
a radiation source;
a collimator; a kind of electronic device with high-pressure air-conditioning system
A detector array with radiation sources arranged opposite each other;
a radiation examination apparatus further comprising a radiation shielding device arranged between the radiation source and the collimator, said radiation shielding device being a radiation shielding device according to any one of claims 1-10.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011137504A1 (en) * | 2010-05-05 | 2011-11-10 | Nauchno-Proizvodstvennoe Chastnoe Uniternoe Predpriyatie Adani | Cargo and vehicle inspection system |
| CN104198507A (en) * | 2014-09-16 | 2014-12-10 | 北京一体通探测技术有限公司 | Shutter device for shielding rays and ray scanning imaging system |
| CN105181723A (en) * | 2015-09-28 | 2015-12-23 | 同方威视技术股份有限公司 | Dual-energy ray scanning system, scanning method and inspection system |
| CN110389387A (en) * | 2019-06-06 | 2019-10-29 | 上琛安防科技（上海）有限公司 | Intelligent X-ray security detection equipment collimation, radiographic source and detection acquisition system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011137504A1 (en) * | 2010-05-05 | 2011-11-10 | Nauchno-Proizvodstvennoe Chastnoe Uniternoe Predpriyatie Adani | Cargo and vehicle inspection system |
| CN104198507A (en) * | 2014-09-16 | 2014-12-10 | 北京一体通探测技术有限公司 | Shutter device for shielding rays and ray scanning imaging system |
| CN105181723A (en) * | 2015-09-28 | 2015-12-23 | 同方威视技术股份有限公司 | Dual-energy ray scanning system, scanning method and inspection system |
| CN110389387A (en) * | 2019-06-06 | 2019-10-29 | 上琛安防科技（上海）有限公司 | Intelligent X-ray security detection equipment collimation, radiographic source and detection acquisition system |
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