CN106328232A - Shielding body applied to shielding of radioactive rays - Google Patents
Shielding body applied to shielding of radioactive rays Download PDFInfo
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- CN106328232A CN106328232A CN201510240659.9A CN201510240659A CN106328232A CN 106328232 A CN106328232 A CN 106328232A CN 201510240659 A CN201510240659 A CN 201510240659A CN 106328232 A CN106328232 A CN 106328232A
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Abstract
On one side, the invention provides a shielding body applied to shielding of radioactive rays. The shielding body comprises a basic main body and a shielding main body, wherein the basic main body is used to support the shielding main body; the shielding main body comprises multiple detachable shielding blocks; at least one shielding block can form an overlap-joint connection with the adjacent shielding blocks or the shielding blocks can be stacked to form the shielding main body; and at least one shielding block has a hexagonal cross section. The shielding block is detachable, and the hexagonal cross section is adopted, so that overlap-joint connection or stacking becomes convenient, and consumption of manpower and materials, transportation cost and transportation time can be reduced; stability of the overlap-joint connection or stacking can be ensured, and the shielding blocks on boundaries do not fall down easily; the basic main body is steady, and the shielding main body is not inclined or turned over easily; and modularized combination can be achieved, production is easy, and protection can be achieved in a flexible and varied manner.
Description
Technical field
The present invention relates to a kind of shield, particularly relate to a kind of shield for shielding radioactive ray.
Background technology
At present, building alpha ray shield wall when, first, by Architectural Structure Design, the mechanism of barrier shield is determined；Secondly, by radiation protection design, the shielding material and thickness requirement selected under the conditions of the source item that design requires is determined；Finally, unit in charge of construction completes the construction work of barrier shield according to design drawing.If shielding material is cement, general use cast-in-site or the bottled way of prefabricated cement board.If shielding material is lead or steel, it is generally required to carry out on-site consolidation after factory process becomes large-sized structural parts.
In practical operation, there is three below problem in said method:
1, in view of cost factor, barrier shield relates to limited allowance in radiation protection design.Once source item condition changes, and the thickness of shielding material cannot meet radiation proof needs, and the reconstruction work of barrier shield bothers very much.It addition, the installation cost of large-sized structural parts is also the most expensive；
2, due to the restriction of execution conditions, Large-scale Hoisting equipment cannot be employed in the job site of some barrier shields, and the installation of large-sized structural parts is the most difficult；
3, the assembly of large-sized structural parts also results in the adjacent surface between shielding slab and shielding slab and certainly exists a gap, and effective shielding thickness herein is zero, namely there is radioactive ray and shields the problem run through.
Above-mentioned source item condition is noun special in radiation protection design, refers to that the radioactive ray device shielded or radioactive source have influence on some indexs of radiation protection design, such as:
1, for x-ray apparatus, these indexs include ray type, energy, x-ray apparatus output, shield slip, go out to restraint mouth geometry etc.；
2, for radioactive source, these indexs include ray type, energy, radioactive source activity, shield slip, go out to restraint mouth physical dimension etc..
Summary of the invention
In order to solve the defect that prior art exists, one aspect of the present invention provides a kind of shield for shielding radioactive ray, wherein, shield includes base main body and shielding main body, base main body is used for supporting shielding main body, shielding main body include multiple can be disassembled ground shielding slab, at least one shielding slab can mutually overlap with adjacent shielding slab or stack with formed shielding main body, at least one shielding slab has hexagonal cross section.Shielding slab is detachable and uses the convenient overlap joint of hexagonal cross section or stacking, reduces human and material resources, cost of transportation and haulage time；Being able to ensure that overlap or stack consolidates, the shielding slab on border will not fall；Base main body is stable, and shielding main body is not easy to roll overturning；It is capable of modular combination, it is easy to produce, flexible and changeable protection.
In order to improve the reliability connected between detachable shielding slab further, it is preferable that at least one shielding slab arranges tangible latch members to carry out the sealed connection of shape with adjacent shielding slab.
As one preferably, shielding main body includes the first shielding slab, secondary shielding block, the 3rd shielding slab, the 4th shielding slab and the 5th shielding slab, described first shielding slab has two adjacent surfaces to arrange tangible latch members, described secondary shielding block has three adjacent surfaces to arrange tangible latch members, described 3rd shielding slab has four adjacent surfaces to arrange tangible latch members, described 4th shielding slab has five adjacent surfaces to arrange tangible latch members, and described 5th shielding slab has six adjacent surfaces to arrange tangible latch members.
Wherein, at least one during adjacent surface arranges tangible latch projection or the sealed groove of shape.
As one preferably, at least one shielding slab is set to octahedron and has orthohexagonal cross section.
When arranging base main body, it is desirable to base main body includes can be with the outer surface of shielding slab stacking.
Base main body defines the first length, and described shielding main body defines the second length, and described first length is less than the second length.So arrange and be advantageous in that the base main body of little area just can reach stablizing of whole shield.
In order to solve gap that may be present between shielding slab, shielding main body includes that structure or gap shielding structure are filled up in gap, and gap is filled up structure and is set to the sealed structure of filling up of shape with the gap filling up between shielding slab；Gap shielding structure is set to shielding slab cross structure, shielding main body includes the first shielding main body and secondary shielding main body, first shielding subject definition has the first shielding slab to connect gap, secondary shielding subject definition has secondary shielding block to connect gap, first shielding main body is blocked secondary shielding block and is connected gap, and secondary shielding main body is blocked the first shielding slab and connected gap.
In order to effectively shield radioactive ray as much as possible, the material of shielding slab includes at least one in the material of material or the shielding photon shielding neutron, it is preferable that the material of shielding slab includes boron carbide, lead and barite (being mainly composed of barium sulfate).
In order to reach to shield the most firm of main body, it is provided that a kind of main body that shields includes that the shielding slab being easy to the hollow that girth member passes is to strengthen the intensity of shielding main body.
So-called " hexagonal cross section " refers to generally in hexagonal cross section, does not implies that one is set to proper hexagonal geometry.As in one case, being partially provided with some and not having protruding from of manifest function former hexagonal raised or sunken in former hexagonal groove at cross section, these are protruding or groove does not affect cross section and generally presents hexagon, it is negligible at this, certainly, well known to those skilled in the art, other the cross section that do not affects generally presents hexagonal shape, also complies with the definition of " hexagonal cross-section "；In another scenario, being partially provided with some to there is protruding from of some specific function former hexagonal raised or sunken in former hexagonal groove at cross section, as these are protruding or groove is set to shape latch members, because these are protruding or groove does not affects cross section yet and generally presents hexagon, can also ignore at this, certainly, well known to those skilled in the art, other the cross section that do not affects generally presents the shape of hexagonal shape latch members or other specific functions, also complies with the definition of " hexagonal cross-section ".
So-called " orthohexagonal cross section " is also similar with the definition of above-mentioned " hexagonal cross section ", and difference is to replace hexagon with regular hexagon.
Accompanying drawing explanation
Fig. 1 is the profile of the shield in first embodiment of the invention.
Fig. 2 is the schematic perspective view of the detachable shielding slab in first embodiment of the invention, and wherein, shape latch members is parallel to each other with end face.
Fig. 3 is the schematic perspective view of another embodiment of the detachable shielding slab in first embodiment of the invention, and wherein, shape latch members is mutually perpendicular to end face.
Fig. 4 is the schematic perspective view of a further embodiment of the detachable shielding slab in first embodiment of the invention, and wherein, shape latch members protrudes from former hexagonal end face (dotted line represents).
Fig. 5 is the base main body in first embodiment of the invention and the schematic perspective view of shielding main body stacking, wherein, in order to convenience that gap fill up is shown and described, merely illustrates the shielding slab of ground floor.
Fig. 6 is the base main body in first embodiment of the invention and the schematic perspective view of another embodiment of shielding main body stacking, wherein, in order to convenience that gap fill up is shown and described, merely illustrates the shielding slab of ground floor.
Fig. 7 is the profile of the shield in second embodiment of the invention.
Fig. 8 is the profile of the shield in third embodiment of the invention.
In order to clearly represent and facilitate description, accompanying drawing not use same ratio, same size draw.
Detailed description of the invention
Please with reference first to Fig. 1 and Fig. 2, it illustrates the shield 10 for shielding radioactive ray in the first embodiment of the present invention, it includes base main body 11 and shielding main body 12.Base main body 11 is used for supporting shielding main body 12, when arranging base main body, it is desirable to base main body 11 includes can be with the outer surface of shielding slab stacking.Base main body 11 defines the first length D1, and shielding main body 12 defines the second length D2, and the first length D1 is less than the second length D2.So arrange and be advantageous in that the base main body 11 of little area just can reach stablizing of whole shield.Shielding main body 12 include multiple can be disassembled ground shielding slab 120, at least one shielding slab 120 can mutually overlap with adjacent shielding slab or stack to form shielding main body 12, at least one shielding slab 120 is set to octahedron and has hexagonal cross section, as one preferably, at least one shielding slab 120 is set to octahedron and has orthohexagonal cross section.Shielding slab 120 has end face, bottom surface and six sides.Shielding slab is detachable and uses the convenient overlap joint of hexagonal cross section or stacking, reduces human and material resources, cost of transportation and haulage time；Being able to ensure that overlap or stack consolidates, the shielding slab on border will not fall；Base main body is stable, and shielding main body is not easy to roll overturning；It is capable of modular combination, it is easy to produce, flexible and changeable protection.
In order to improve the reliability connected between detachable shielding slab further, at least one shielding slab 120 arranges tangible latch members 121 to carry out the sealed connection of shape with adjacent shielding slab 120.
In order to reach to shield the most firm of main body, it is provided that a kind of main body 12 that shields includes that the shielding slab 120 being easy to the hollow 122 that girth member passes is to strengthen the intensity of shielding main body.Wherein girth member can be the object such as reinforcing bar or rope, and well known to those skilled in the art, girth member can also use other objects.In one aspect, even if in order to consolidate further, also there is no need to be provided with on all of shielding slab hollow structure, but local is needed the most firm region, arrange and the shielding slab of this hollow is installed so that girth member passes.
For the convenience stacked, can such arrange at least one dismountable shielding slab, refer to Fig. 2, it illustrates and be respectively provided with shape latch members 121 on the first side of shielding slab 120 and the second side, shape latch members 121 is on the first side to be parallel to the convex form setting of end face, shape latch members 121 is on the second side to be parallel to the form of grooves setting of end face, wherein, first side and the second side are adjacent, the projection of shape latch members and groove sequential on two adjacent faces.In another embodiment of shape latch members, refer to Fig. 3, shape latch members 121 ' on shielding slab 120 ' is on the first side to be perpendicular to the convex form setting of end face, shape latch members 121 ' on the second side and the 3rd side be perpendicular to end face form of grooves arrange, wherein, first side and the second side are adjacent, and the first side and the 3rd side are adjacent, the projection of shape latch members and groove sequential on two adjacent faces.' on shape latch members 121 ' ' is arranged protruding from the convex form of former end face (dotted line represents) on the first side in a further embodiment of shape latch members, to refer to Fig. 4, shielding slab 120 '.Well known to those skilled in the art, if the overlap joint that disclosure satisfy that between shielding slab and shielding slab or stacking, the projection of above-mentioned shape latch members and the position of groove can exchange, protruding and groove version can also be arranged to other shapes, and protruding and groove spread pattern can also be arranged by other forms.
Additionally, the projection of shape latch members or the number of groove can be arranged by demand, as a example by shielding slab in Fig. 2, shape latch members 121 can be only set on the first side of shielding slab 120, or it is respectively provided with shape latch members 121 on first side and the second side of shielding slab 120, or the first side at shielding slab 120, it is respectively provided with shape latch members 121 on second side and the 3rd side, or the first side at shielding slab 120, second side, it is respectively provided with shape latch members 121 on 3rd side and the 4th side, or the first side at shielding slab 120, second side, 3rd side, it is respectively provided with shape latch members 121 on 4th side and the 5th side, or it is respectively provided with shape latch members 121 on six sides of shielding slab 120.That is, shielding main body 12 includes the first shielding slab, secondary shielding block, the 3rd shielding slab, the 4th shielding slab and the 5th shielding slab, first shielding slab has two adjacent side to arrange tangible latch members, secondary shielding block has three adjacent side to arrange tangible latch members, 3rd shielding slab has four adjacent side to arrange tangible latch members, 4th shielding slab has five adjacent side to arrange tangible latch members, and the 5th shielding slab has six sides to arrange tangible latch members.
There may be gap between shielding slab thus affect the shield effectiveness of shield, in order to solve gap that may be present between shielding slab, it is provided that the following two kinds approach.
The first approach refers to Fig. 5, it illustrates the schematic perspective view of base main body 11 and shielding main body 12 stacking, wherein, in order to convenience that gap fill up is shown and described, merely illustrates the shielding slab 120 of ground floor.Shielding main body 12 includes that structure 123 is filled up in gap, gap is filled up structure 123 and is set to the sealed structure of filling up of shape with the gap filling up between shielding slab, so-called shape is sealed fill up structure 123 can be the powder that uses shielding material to make between shielding slab with arrange on filling chink or shielding slab projection or groove with the groove arranged on adjacent shielding slab or the sealed cooperation of convex shaped with filling chink, such as the shape latch projection in Fig. 4.
The second approach refers to Fig. 6, it illustrates the schematic perspective view of base main body 11 and another embodiment of shielding main body 12 stacking, wherein, in order to the convenience of blocking gap is shown and described, merely illustrates the shielding slab 120 of ground floor.Shielding main body 12 includes gap shielding structure 124, gap shielding structure 124 is set to shielding slab cross structure, shielding main body 12 includes the first shielding main body and secondary shielding main body, first shielding subject definition has the first shielding slab to connect gap 124, secondary shielding subject definition has secondary shielding block to connect gap 125, first shielding main body is blocked secondary shielding block and is connected gap 125, and secondary shielding main body is blocked the first shielding slab and connected gap 124, thus realizes blocking gap.
Referring to Fig. 7, it illustrates the second embodiment of shield, with numeral 20 mark, in this embodiment, for shielding the shield 20 of radioactive ray, it includes base main body 21 and shielding main body 22.Base main body 21 is used for supporting shielding main body 22, when arranging base main body 21, it is desirable to base main body 21 includes can be with the outer surface of shielding slab stacking.Shielding main body 22 include multiple can be disassembled ground shielding slab 220, at least one shielding slab 220 can mutually overlap with adjacent shielding slab or stack to form shielding main body 22, at least one shielding slab 220 is set to octahedron and has hexagonal cross section, as one preferably, at least one shielding slab 220 is set to octahedron and has orthohexagonal cross section.Shielding slab 220 has end face, bottom surface and six sides.Shielding slab is detachable and uses the convenient overlap joint of hexagonal cross section or stacking, reduces human and material resources, cost of transportation and haulage time；Being able to ensure that overlap or stack consolidates, the shielding slab on border will not fall；Base main body is stable, and shielding main body is not easy to roll overturning；It is capable of modular combination, it is easy to produce, flexible and changeable protection.Being with difference in first embodiment, the cross section of shield 20 is arranged to the tetragon of rule, as being arranged to complete body of wall.When filling with complete shielding slab 220, incomplete shielding slab or other shielding materials can be used to fill according to actual size, thus complete whole barrier shield.
In the 3rd embodiment of shield 30, specifically refer to Fig. 8, when needing to shield body of wall with the two sides at turning, it is provided with adapter 33 between the first shielding main body 31 and secondary shielding main body 32, the end of the adaptive first shielding main body 31 in one end of adapter 33, the end of other end adaptation secondary shielding main body 32.Well known to those skilled in the art, can be as a complete base main body between the base main body of two shielding bodies of wall, it is also possible to be provided with adapter.
In order to effectively shield radioactive ray as much as possible, the material of shielding slab can be any one or the mixture of above-mentioned multiple material of lead sand, iron ore, sand, blinding, polyethylene powders.In other embodiments of shielding slab design of material, the material of shielding slab includes at least one in the material of material or the shielding photon shielding neutron, it is preferable that the material of shielding slab includes boron carbide, lead and barite (being mainly composed of barium sulfate).
So-called " radioactive ray " includes the various radioactive rays well known to those skilled in the art such as X-ray, alpha ray, β ray, gamma-rays, proton or neutron.Different or distance radioactive ray the distance of character according to radioactive ray is different, and the material of shielding slab can change flexibly.Can be when the barrier shield under arranging specified conditions, by calculating the kind or proportioning obtaining the material that each shielding slab is suitable for.
So-called " hexagonal cross section " refers to generally in hexagonal cross section, does not implies that one is set to proper hexagonal geometry.As in one case, being partially provided with some and not having protruding from of manifest function former hexagonal raised or sunken in former hexagonal groove at cross section, these are protruding or groove does not affect cross section and generally presents hexagon, it is negligible at this, certainly, well known to those skilled in the art, other the cross section that do not affects generally presents hexagonal shape, also complies with the definition of " hexagonal cross-section "；In another scenario, being partially provided with some to there is protruding from of some specific function former hexagonal raised or sunken in former hexagonal groove at cross section, as these are protruding or groove is set to shape latch members, because these are protruding or groove does not affects cross section yet and generally presents hexagon, can also ignore at this, certainly, well known to those skilled in the art, other the cross section that do not affects generally presents the shape of hexagonal shape latch members or other specific functions, also complies with the definition of " hexagonal cross-section ".
So-called " orthohexagonal cross section " is also similar with the definition of above-mentioned " hexagonal cross section ", and difference is to replace hexagon with regular hexagon.
The shield being used for shielding radioactive ray of present invention announcement is not limited to the content described in above example and the structure represented by accompanying drawing.The change apparently on the basis of the present invention, material, shape and the position of wherein component made, substitute or revise, all within the scope of protection of present invention.
Claims (10)
1. the shield being used for shielding radioactive ray, it is characterized in that: described shield includes base main body and shielding main body, described base main body is used for supporting described shielding main body, described shielding main body include multiple can be disassembled ground shielding slab, at least one shielding slab can mutually overlap with adjacent shielding slab or stack to form shielding main body, and at least one shielding slab described has hexagonal cross section.
Shield for shielding radioactive ray the most according to claim 1, it is characterised in that: at least one shielding slab described arranges tangible latch members to carry out the sealed connection of shape with adjacent shielding slab.
Shield for shielding radioactive ray the most according to claim 2, it is characterized in that: shielding main body includes the first shielding slab, secondary shielding block, 3rd shielding slab, 4th shielding slab and the 5th shielding slab, described first shielding slab has two adjacent surfaces to arrange tangible latch members, described secondary shielding block has three adjacent surfaces to arrange tangible latch members, described 3rd shielding slab has four adjacent surfaces to arrange tangible latch members, described 4th shielding slab has five adjacent surfaces to arrange tangible latch members, described 5th shielding slab has six adjacent surfaces to arrange tangible latch members.
Shield for shielding radioactive ray the most according to claim 3, it is characterised in that: described adjacent surface arranges at least one in tangible latch projection or the sealed groove of shape.
Shield for shielding radioactive ray the most according to claim 1, it is characterised in that: at least one shielding slab described is set to octahedron and has orthohexagonal cross section.
Shield for shielding radioactive ray the most according to claim 1, it is characterised in that: described base main body includes can be with the outer surface of shielding slab stacking.
Shield for shielding radioactive ray the most according to claim 1, it is characterised in that: described base main body defines the first length, and described shielding main body defines the second length, and described first length is less than the second length.
Shield for shielding radioactive ray the most according to claim 1, it is characterized in that: described shielding main body includes that structure or gap shielding structure are filled up in gap, described gap is filled up structure and is set to the sealed structure of filling up of shape with the gap filling up between shielding slab；Described gap shielding structure is set to shielding slab cross structure, described shielding main body includes the first shielding main body and secondary shielding main body, described first shielding subject definition has the first shielding slab to connect gap, described secondary shielding subject definition has secondary shielding block to connect gap, described first shielding main body is blocked secondary shielding block and is connected gap, and described secondary shielding main body is blocked the first shielding slab and connected gap.
Shield for shielding radioactive ray the most according to claim 1, it is characterised in that: the material of described shielding slab includes at least one in the material of material or the shielding photon shielding neutron.
Shield for shielding radioactive ray the most according to claim 1, it is characterised in that: described shielding main body includes that the shielding slab being easy to the hollow that girth member passes is to strengthen the intensity of shielding main body.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510240659.9A CN106328232B (en) | 2015-05-12 | 2015-05-12 | For shielding the shield of radioactive ray |
| CN201910170917.9A CN110415852B (en) | 2015-05-12 | 2015-05-12 | Shielding body for shielding radioactive rays |
| CN201910171131.9A CN110400647B (en) | 2015-05-12 | 2015-05-12 | Shielding body for shielding radioactive rays |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510240659.9A CN106328232B (en) | 2015-05-12 | 2015-05-12 | For shielding the shield of radioactive ray |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910170917.9A Division CN110415852B (en) | 2015-05-12 | 2015-05-12 | Shielding body for shielding radioactive rays |
| CN201910171131.9A Division CN110400647B (en) | 2015-05-12 | 2015-05-12 | Shielding body for shielding radioactive rays |
Publications (2)
| Publication Number | Publication Date |
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| CN106328232A true CN106328232A (en) | 2017-01-11 |
| CN106328232B CN106328232B (en) | 2019-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910170917.9A Active CN110415852B (en) | 2015-05-12 | 2015-05-12 | Shielding body for shielding radioactive rays |
| CN201910171131.9A Active CN110400647B (en) | 2015-05-12 | 2015-05-12 | Shielding body for shielding radioactive rays |
| CN201510240659.9A Active CN106328232B (en) | 2015-05-12 | 2015-05-12 | For shielding the shield of radioactive ray |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910170917.9A Active CN110415852B (en) | 2015-05-12 | 2015-05-12 | Shielding body for shielding radioactive rays |
| CN201910171131.9A Active CN110400647B (en) | 2015-05-12 | 2015-05-12 | Shielding body for shielding radioactive rays |
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| CN109420258A (en) * | 2017-08-24 | 2019-03-05 | 南京中硼联康医疗科技有限公司 | Neutron capture treatment system |
| CN110570962A (en) * | 2018-03-28 | 2019-12-13 | 中国船舶重工集团公司第七一九研究所 | Local shielding structure of return bend of shielding performance adjustable |
| CN112331375A (en) * | 2020-11-23 | 2021-02-05 | 四川玄武岩纤维新材料研究院(创新中心) | Basalt and other fiber honeycomb fabric nuclear shielding composite material and preparation method and application thereof |
| CN112489825A (en) * | 2020-11-26 | 2021-03-12 | 中广核研究院有限公司 | Shielding module for compactly arranging small stacks |
| CN112530608A (en) * | 2020-11-26 | 2021-03-19 | 中广核研究院有限公司 | Near-stack shielding device for small stack |
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| RU2745074C1 (en) * | 2020-02-26 | 2021-03-19 | Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" | Assembled biological protection against ionizing radiation |
| CN112895438B (en) * | 2021-01-27 | 2021-11-23 | 中国核动力研究设计院 | Method and device for manufacturing radiation shield |
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| CN109420258B (en) * | 2017-08-24 | 2024-02-23 | 南京中硼联康医疗科技有限公司 | Neutron capture therapy system |
| CN110570962A (en) * | 2018-03-28 | 2019-12-13 | 中国船舶重工集团公司第七一九研究所 | Local shielding structure of return bend of shielding performance adjustable |
| CN112331375A (en) * | 2020-11-23 | 2021-02-05 | 四川玄武岩纤维新材料研究院(创新中心) | Basalt and other fiber honeycomb fabric nuclear shielding composite material and preparation method and application thereof |
| CN112489825A (en) * | 2020-11-26 | 2021-03-12 | 中广核研究院有限公司 | Shielding module for compactly arranging small stacks |
| CN112530608A (en) * | 2020-11-26 | 2021-03-19 | 中广核研究院有限公司 | Near-stack shielding device for small stack |
| CN112530608B (en) * | 2020-11-26 | 2024-03-01 | 中广核研究院有限公司 | Near stack shielding device for small stacks |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110400647B (en) | 2021-05-07 |
| CN110400647A (en) | 2019-11-01 |
| CN106328232B (en) | 2019-03-19 |
| CN110415852B (en) | 2021-10-22 |
| CN110415852A (en) | 2019-11-05 |
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