CN113472437A - Primary mirror part suitable for optical antenna of space communication terminal - Google Patents
Primary mirror part suitable for optical antenna of space communication terminal Download PDFInfo
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- CN113472437A CN113472437A CN202110969081.6A CN202110969081A CN113472437A CN 113472437 A CN113472437 A CN 113472437A CN 202110969081 A CN202110969081 A CN 202110969081A CN 113472437 A CN113472437 A CN 113472437A
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- 238000004891 communication Methods 0.000 title claims abstract description 26
- 230000003287 optical effect Effects 0.000 title claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 36
- 229910001069 Ti alloy Inorganic materials 0.000 claims abstract description 7
- 239000011521 glass Substances 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000012856 packing Methods 0.000 description 10
- 238000012545 processing Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000005486 microgravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0799—Monitoring line transmitter or line receiver equipment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Lens Barrels (AREA)
Abstract
The invention provides a main mirror component suitable for an optical antenna of a space communication terminal, which comprises a cylindrical main mirror seat, a main mirror gasket fixedly arranged on the inner wall of the main mirror seat and a main mirror fixedly arranged in the main mirror gasket. According to the invention, the primary lens gasket is arranged between the primary lens seat and the primary lens, when the primary lens expands due to heating, as the elastic modulus of the material of the primary lens gasket is smaller than that of the material of the primary lens seat and smaller than that of the material of the primary lens seat, the reaction force of the primary lens gasket on the primary lens is smaller than that of the primary lens seat without the primary lens gasket, and the deformation of the primary lens caused by the reaction force can be reduced by arranging the primary lens gasket; and the main lens base is made of titanium alloy with small linear thermal expansion coefficient, so that the deformation of the main lens base caused by thermal expansion is small, and the deformation of the main lens is reduced.
Description
Technical Field
The invention belongs to the field of space optical communication, and particularly relates to a main mirror component suitable for an optical antenna of a space communication terminal.
Background
With the rapid development of communication services, the demands for high-capacity and high-speed communication technologies are urgent, whether for civil use or military use. Currently, the data transmission capability of satellites is far from meeting the development requirement. The space optical communication technology has the characteristics of wide communication frequency band, large information capacity, large optical gain, small beam divergence angle and the like, so that the requirement of modern communication can be met.
In the space environment of the space optical communication, the environment of the optical antenna is severe, and the optical antenna is subjected to heat radiation from the sun besides the vacuum and microgravity environment. When the satellite is in the phenomenon of sunset, the lens group in the optical antenna is directly subjected to heat radiation from the sun, and the lens frame seat and the lens absorb heat and rise in temperature to generate thermal expansion deformation, so that the optical axis of the communication light beam deviates, the light beam quality of the communication light beam is influenced, and even inter-satellite communication failure can be caused seriously.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and the invention aims to provide a main mirror part suitable for an optical antenna of a space communication terminal.
In order to achieve the purpose, the invention adopts the following technical scheme: a primary mirror component suitable for an optical antenna of a space communication terminal comprises a cylindrical primary mirror seat, a primary mirror gasket fixedly arranged on the inner wall of the primary mirror seat and a primary mirror piece fixedly arranged in the primary mirror gasket, wherein the inner wall of the primary mirror gasket is in clearance fit with the outer wall of the primary mirror piece; the modulus of elasticity of the primary mirror gasket material is less than the modulus of elasticity of the primary mirror piece material and less than the modulus of the primary mirror base material.
In the technical scheme, the main lens gasket is arranged between the main lens seat and the main lens, when the main lens expands due to heating, the main lens exerts a force on the main lens gasket, and the main lens gasket deforms under the action of the force. Because the elastic modulus of the material of the primary lens gasket is smaller than that of the material of the primary lens and smaller than that of the material of the primary lens seat, the reaction force of the primary lens gasket on the primary lens is smaller than that of the primary lens seat without the primary lens gasket, and therefore, the deformation of the primary lens caused by the reaction force can be reduced by arranging the primary lens gasket, and the offset of the optical axis of the primary lens is reduced.
The main mirror structure has the characteristics of simple structure, good stability and the like.
In a preferred embodiment of the present invention, the outer wall of the primary lens has an outer annular platform, the inner wall of the primary lens gasket has a first inner annular platform and a second inner annular platform which are arranged at an interval, a groove is formed between the first inner annular platform and the second inner annular platform, the outer annular platform is located in the groove and is axially limited by the first inner annular platform and the second inner annular platform, and the outer wall of the outer annular platform is in clearance fit with the inner wall of the groove.
Among the above-mentioned technical scheme, the inner ring platform clamp of main lens is established between first inner ring platform and the second inner ring platform of main mirror packing ring, realizes the fixed of main lens and main mirror packing ring from this, simple structure.
In a preferred embodiment of the invention, the primary mirror gasket comprises a front gasket and a rear gasket fixed on the inner wall of the primary mirror base, the first inner land and the second inner land being provided on the front gasket and the rear gasket, respectively.
Among the above-mentioned technical scheme, compare integrative the setting of primary mirror packing ring, the primary mirror packing ring of this scheme comprises preceding packing ring and back packing ring two parts, makes things convenient for the installation of this primary mirror part.
In a preferred embodiment of the invention, the outer wall of the front washer is screwed to the inner wall of the main mirror base, and the outer wall of the rear washer is also screwed to the inner wall of the main mirror base.
In a preferred embodiment of the invention, the rear end face of the rear gasket is also provided with blind holes. The blind hole is arranged to facilitate installation of the rear gasket.
In another preferred embodiment of the present invention, a space is provided between the rear end surface of the front gasket and the front end surface of the rear gasket. Compared with the scheme that when the rear gasket presses the outer ring table of the main lens tightly, the rear end face of the front gasket is tightly abutted to the front end face of the rear gasket, the scheme can reduce the part processing precision and reduce the processing cost; when the main lens piece is heated and takes place the inflation, the rear end face of comparing the preceding packing ring supports tightly with the preceding terminal surface of back packing ring, and this scheme can reduce the radial deflection of preceding packing ring through setting up aforementioned space to the reaction force of packing ring to main lens before reducing, thereby reduce the main lens piece and receive the produced deformation of reaction force, thereby further reduce the offset of main lens piece optical axis.
In another preferred embodiment of the present invention, the back step surface of the outer ring platform is flush with the back end surface of the main lens, the back gasket is a gasket, and the back gasket is arranged at the back side of the main lens and abuts against the back end surface of the main lens.
Among the above-mentioned technical scheme, when processing outer loop platform, only need to process the step face and the lateral wall of its front side, it is more convenient to process. The rear gasket is a gasket, so that the weight is light, and the reduction of the weight of the structure of the main mirror part is facilitated; and compared with the L-shaped structure, the structure is simple, and the processing cost of the gasket structure is lower.
In another preferred embodiment of the present invention, the material of the primary lens is microcrystalline glass, the material of the primary lens base is titanium alloy, and the material of the primary lens gasket is aluminum alloy. The microcrystalline glass, the titanium alloy and the aluminum alloy are easy to obtain and low in cost, and can be used for outer space to meet the use function; and the main lens base is made of titanium alloy with small linear thermal expansion coefficient, so that the deformation of the main lens base caused by thermal expansion is small, and the deformation of the main lens is reduced. In another preferred embodiment of the present invention, a plurality of first dispensing holes distributed at intervals in the circumferential direction are formed through the side wall of the main lens base, the first dispensing holes are arranged corresponding to the outer wall of the main lens gasket, and the main lens gasket is dispensed and fixed with the main lens base through the first dispensing holes. The relative position of the main mirror gasket and the main mirror base is fixed to be unchanged.
In another preferred embodiment of the present invention, a plurality of second dispensing holes distributed at intervals in the circumferential direction are penetratingly disposed on the side wall of the primary mirror gasket, the second dispensing holes are disposed corresponding to the outer wall of the primary mirror, and the primary mirror gasket is fixed to the primary mirror gasket by dispensing through the second dispensing holes. The relative position of the main lens and the main lens gasket is fixed to be unchanged, so that the relative position of the main lens and the main lens base is fixed to be unchanged.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic cross-sectional structural diagram of a main mirror component of an optical antenna suitable for a spatial communication terminal according to an embodiment of the present application.
Fig. 2 is a schematic perspective view of a primary lens in an embodiment of the present application.
Fig. 3 is a rear view of the rear gasket in the embodiment of the present application.
Reference numerals in the drawings of the specification include: the main lens comprises a main lens 1, an outer ring platform 101, a main lens base 2, a first dispensing hole 201, a main lens gasket 3, a first inner ring platform 301, a second inner ring platform 302, a second dispensing hole 303, a gap 304, a front gasket 31, a rear gasket 32 and a blind hole 321.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The invention provides a main mirror component suitable for an optical antenna of a space communication terminal, which comprises a cylindrical main mirror seat 2, a main mirror gasket 3 fixedly arranged on the inner wall of the main mirror seat 2 and a main mirror 1 fixedly arranged in the main mirror gasket 3, wherein the main mirror 1 partially extends out of the main mirror seat 2, and the inner wall of the main mirror gasket 3 is in clearance fit with the outer wall of the main mirror 1, as shown in figure 1.
In the present invention, the elastic modulus of the material of the primary mirror gasket 3 is smaller than the elastic modulus of the material of the primary lens 1 and smaller than the elastic modulus of the material of the primary mirror base 2; the material of the main lens base 2 is selected from the materials with small linear thermal expansion coefficient. The elastic modulus and the linear thermal expansion coefficient of the preferred material of the present invention satisfy both of the above conditions.
Specifically, the material of the main lens 1 may be microcrystalline glass, such as a glass with a linear thermal expansion coefficient of about 0.5 × 106The modulus of elasticity was 90.3 GPa. The material of the primary lens base 2 can be selected from titanium alloy material, such as material with linear expansion coefficient of 9.41 x 106The modulus of elasticity was 107.8 GPa. The material of the main mirror gasket 3 can be selected from aluminum alloy, for example, the elastic modulus is 71 Gpa. In practice, the elastic modulus of the primary lens 1, the primary lens holder 2 and the primary lens gasket 3 may fluctuate within a certain range depending on the processing technique, but it is necessary to satisfy that the elastic modulus of the material of the primary lens gasket 3 is smaller than the elastic modulus of the material of the primary lens 1 and smaller than the elastic modulus of the material of the primary lens holder 2.
With such a configuration, when the main lens 1 expands due to heat, a force acts on the main lens gasket 3, and the main lens gasket 3 deforms under the action of the force. Since the elastic modulus of the material of the primary mirror gasket 3 is 71GPa, which is smaller than the elastic modulus of the material of the primary mirror 1 by 90.3GPa and smaller than the elastic modulus of the material of the primary mirror base 2 by 107.8GPa, the amount of deformation of the primary mirror gasket 3 is small, and the influence of the primary mirror gasket 3 on the deformation of the primary mirror 1 is reduced.
The primary lens base 2 is made of titanium alloy with a small linear thermal expansion coefficient, and the deformation amount of the primary lens base 2 caused by thermal expansion is small, so that the deformation amount of the primary lens 1 is reduced.
Preferably, the primary lens 1, the primary lens holder 2 and the primary lens gasket 3 are coaxially arranged, and the primary lens gasket 3 has a good thermal conductivity coefficient, which is beneficial to heat dissipation of the primary lens 1.
As shown in fig. 1 and 2, in the present embodiment, an outer annular table 101 is provided on an outer wall of a primary lens 1, a first inner annular table 301 and a second inner annular table 302 are provided on an inner wall of a primary lens gasket 3 at intervals, a groove is formed between the first inner annular table 301 and the second inner annular table 302, the outer annular table 101 is located in the groove and axially limited by the first inner annular table 301 and the second inner annular table 302, and an outer wall of the outer annular table 101 is in clearance fit with the inner wall of the groove.
In another preferred embodiment, as shown in fig. 1, the main mirror gasket 3 comprises a front gasket 31 and a rear gasket 32 fixed to the inner wall of the main mirror base 2, for example, the outer wall of the front gasket 31 is screwed to the inner wall of the main mirror base 2, and the outer wall of the rear gasket 32 is also screwed to the inner wall of the main mirror base 2. The first inner land 301 and the second inner land 302 are provided on the front gasket 31 and the rear gasket 32, respectively, with a gap 304 between a rear end surface of the front gasket 31 and a front end surface of the rear gasket 32.
The main mirror gasket 3 of this embodiment is composed of a front gasket 31 and a rear gasket 32, and is convenient for the installation of this main mirror component, for example, first the front gasket 31 is screwed on the inner wall of the main mirror base 2 and is screwed, then the main lens 1 is inserted into the front gasket 31 from the back to the front, the front step surface of the outer ring platform 101 of the main lens 1 is limited by the first inner ring platform 301 of the front gasket 31, then the rear gasket 32 is screwed on the inner wall of the main mirror base 2 and is screwed, the main lens 1 is compressed, and the rear step surface of the outer ring platform 101 of the main lens 1 is limited by the second inner ring platform 302 of the rear gasket 32.
As shown in fig. 1 and 3, in order to facilitate installation of the rear gasket 32, a plurality of blind holes 321, such as four blind holes 321, may be disposed on the rear end surface of the rear gasket 32. Thus, a tool can be inserted into the blind hole 321, which facilitates the rotation of the rear washer 32, which causes the rear washer 32 to be screwed onto the inner wall of the main lens holder 2 and to press the main lens 1.
In another preferred embodiment, as shown in fig. 1, there is a gap 304 between the rear end face of the front gasket 31 and the front end face of the rear gasket 32. Therefore, when the main lens 1 expands due to heat, by providing the gap 304, the radial deformation of the front gasket 31 can be reduced to reduce the reaction force of the front gasket 31 on the main lens 1, so that the deformation of the main lens 1 caused by the reaction force is reduced, and the offset of the optical axis of the main lens 1 is further reduced.
In another preferred embodiment, as shown in fig. 1 and 2, the back step surface of the outer annular table 101 is flush with the back end surface of the main lens 1, so that when the outer annular table 101 is machined, only the step surface on the front side is machined, and the machining cost is lower. The rear gasket 32 is a gasket, i.e., a thin circular ring, and the rear gasket 32 is disposed on the rear side of the main lens 1 and abuts against the rear end surface of the main lens 1.
As shown in fig. 1, in another preferred embodiment, a plurality of first dispensing holes 201 are formed through the side wall of the main lens holder 2 and are circumferentially spaced and uniformly distributed, the first dispensing holes 201 are disposed corresponding to the outer wall of the front gasket 31, and the front gasket 31 is dispensed and fixed with the main lens holder 2 through the first dispensing holes 201, which is beneficial to fixing the relative position of the front gasket 31 and the main lens holder 2 unchanged.
As shown in fig. 1, in another preferred embodiment, a plurality of circumferentially spaced and uniformly distributed second dispensing holes 303 are penetratingly disposed on a side wall of the front gasket 31, the second dispensing holes 303 are disposed corresponding to an outer wall of the outer ring platform 101 of the main lens 1, and the main lens 1 is dispensed and fixed with the front gasket 31 through the second dispensing holes 303, which is beneficial to fixing the relative position of the main lens 1 and the front gasket 31 unchanged, so as to fix the relative position of the main lens 1 and the main lens base 2 unchanged.
As shown in fig. 1, in another preferred embodiment, the second dispensing hole 303 is disposed corresponding to the first dispensing hole 201, and the second dispensing hole 30 is completely or partially overlapped with the first dispensing hole 201, so that the positions of the main lens base 2, the front gasket 31 and the main lens 1 can be fixed by one dispensing.
In the description herein, reference to the description of the terms "preferred embodiment," "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A primary mirror component suitable for an optical antenna of a space communication terminal is characterized by comprising a cylindrical primary mirror base, a primary mirror gasket fixedly arranged on the inner wall of the primary mirror base and a primary mirror piece fixedly arranged in the primary mirror gasket, wherein the inner wall of the primary mirror gasket is in clearance fit with the outer wall of the primary mirror piece;
the modulus of elasticity of the primary mirror gasket material is less than the modulus of elasticity of the primary mirror piece material and less than the modulus of the primary mirror base material.
2. The primary mirror member of claim 1, wherein the primary mirror has an outer ring platform on an outer wall thereof, the primary mirror has a first inner ring platform and a second inner ring platform spaced apart from each other on an inner wall thereof, a groove is formed between the first inner ring platform and the second inner ring platform, the outer ring platform is located in the groove and axially restrained by the first inner ring platform and the second inner ring platform, and an outer wall of the outer ring platform is in clearance fit with an inner wall of the groove.
3. A main mirror unit for an optical antenna of a spatial communication terminal according to claim 2, wherein said main mirror gasket comprises a front gasket and a rear gasket fixed to an inner wall of the main mirror base, said first inner land and said second inner land being provided on the front gasket and the rear gasket, respectively.
4. The main mirror component of an optical antenna for a space communication terminal according to claim 3, wherein the outer wall of the front gasket is screwed with the inner wall of the main mirror base, and the outer wall of the rear gasket is also screwed with the inner wall of the main mirror base.
5. A primary mirror element for an optical antenna of a spatial communication terminal according to claim 3, wherein the rear gasket has blind holes at its rear end face.
6. A primary mirror element for an optical antenna of a spatial communication terminal according to claim 3, wherein a space is provided between the rear end face of the front gasket and the front end face of the rear gasket.
7. The primary mirror assembly of claim 3, wherein the back step surface of the outer ring is flush with the back end surface of the primary mirror, the back gasket is a gasket, and the back gasket is disposed at the back side of the primary mirror and abuts against the back end surface of the primary mirror.
8. A primary mirror member for an optical antenna of a spatial communication terminal according to any one of claims 1 to 7, wherein the material of the primary mirror is microcrystalline glass, the material of the primary mirror base is titanium alloy, and the material of the primary mirror gasket is aluminum alloy.
9. The main mirror assembly suitable for an optical antenna of a spatial communication terminal according to any one of claims 1 to 7, wherein a plurality of first dispensing holes distributed at intervals in a circumferential direction are formed through a side wall of the main mirror base, the first dispensing holes are arranged corresponding to an outer wall of the main mirror gasket, and the main mirror gasket is fixed to the main mirror base by dispensing through the first dispensing holes.
10. The primary mirror assembly according to any one of claims 1 to 7, wherein a plurality of circumferentially spaced second dispensing holes are formed through a sidewall of the primary mirror gasket, the second dispensing holes are disposed corresponding to an outer wall of the primary mirror, and the primary mirror gasket is fixed to the primary mirror gasket by dispensing through the second dispensing holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110969081.6A CN113472437B (en) | 2021-08-23 | 2021-08-23 | Primary mirror part suitable for optical antenna of space communication terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110969081.6A CN113472437B (en) | 2021-08-23 | 2021-08-23 | Primary mirror part suitable for optical antenna of space communication terminal |
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| Publication Number | Publication Date |
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| CN113472437A true CN113472437A (en) | 2021-10-01 |
| CN113472437B CN113472437B (en) | 2023-04-14 |
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| CN113472437B (en) | 2023-04-14 |
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