CN115437103A - Efficient reflector three-point supporting structure - Google Patents
Efficient reflector three-point supporting structure Download PDFInfo
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- CN115437103A CN115437103A CN202211224406.9A CN202211224406A CN115437103A CN 115437103 A CN115437103 A CN 115437103A CN 202211224406 A CN202211224406 A CN 202211224406A CN 115437103 A CN115437103 A CN 115437103A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
- G02B7/183—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors specially adapted for very large mirrors, e.g. for astronomy, or solar concentrators
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Abstract
The invention relates to the technical field of high-precision telescope auxiliary equipment, in particular to a high-efficiency reflector three-point supporting structure, which solves the technical problem that the shape precision of a reflector is poor due to the difference between the environment and the temperature. The method comprises the following steps: the reflector constructs an ultra-lightweight structure; the reflector supporting plate is connected with the ultra-lightweight structure; the flexible joint is connected with the reflector supporting plate through a screw; the plurality of flexible pieces can be connected with the reflector back plate, and the plurality of flexible pieces can respectively form three-point supporting positions on the ultra-lightweight structure and the reflector back plate so as to change and/or change gravity; the acting force generated under the action of temperature change can be transmitted to the diffusion by a plurality of flexible joints through the ultra-light weight structure, so that the three-point support position is stable. The advantage lies in the stress of hookup that arouses by the machining precision, does not directly do because of the transfer path changes and does not apply to the mirror body, avoids three fulcrums in the back to produce the problem of mirror surface three point local deformation under gravity and temperature variation effect simultaneously to be favorable to realizing higher face type precision.
Description
Technical Field
The invention relates to the technical field of high-precision telescope auxiliary equipment, in particular to a high-efficiency reflector three-point supporting structure.
Background
In the existing mode, for a larger-caliber coaxial reflection telescope in the field, no matter what working environment is applied, the influence of temperature and gravity on the reflector is existed all the time, and the larger the caliber of the telescope is, the larger and more obvious the influence is;
at present, with the progress and upgrade of materials and microelectronic technology, particularly the appearance of SiC and about 3 μm CMOS detectors, the reflector can have higher rigidity, shorter focal length and larger caliber;
however, reasonable optical design and structural design need to be matched, so that the same-aperture reflector has higher stability and resolution;
for the circular reflector, especially for matching with a small pixel detector, the same image quality needs a smaller F number, namely the mirror surface shape of the large-curvature circular reflector is needed, the radius reduction of the large-curvature circular reflector is in direct proportion to the reduction of the focal length and can reach 2-3 times, and the mirror surface is bent by several times and is easily influenced by gravity; for the surface type precision of 10nm level, the influence is more obvious;
in the prior art, in the design of a traditional space reflector, the rib height and the rib thickness of a supporting rib on the back of the reflector are generally designed and processed according to integral consistency, the design mode reduces the integral design difficulty of the reflector, and the design method can meet the requirements in the design of small and medium reflectors by combining with the technological limitation of the reflector, but the design method has self design defects when designing a large-caliber reflector;
the back support structure of the reflector also plays a role in supporting the whole stress of the reflector and the transmission of force while bearing the mirror surface of the reflector, wherein the transmission of the force is mainly determined by the thickness and the height of the rib after the weight of the reflector is lightened, a local non-important area of the reflector also has a support rib due to the whole design, and the reflector support rib at the position not only can increase the whole mass of the reflector, but also can increase the deformation of the mirror surface of the reflector when the reflector is subjected to gravity and temperature change;
therefore, the precision of the shape of the reflecting mirror surface is deteriorated, which is particularly obvious in the process of developing a large-caliber space reflecting mirror.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides a high-efficiency reflector three-point supporting structure.
In order to solve the technical problems, the technical scheme of the invention is as follows:
an efficient mirror three point support structure comprising:
a reflector which constructs an ultra lightweight structure;
a reflector plate connected to the ultra lightweight structure;
the flexible sections are connected with the reflector supporting plate through screws;
the flexible sections can be connected with the reflector back plate, and three-point supporting positions can be formed on the ultra-lightweight structure and the reflector back plate respectively by the flexible sections, so that gravity changes and/or gravity changes; the acting force generated under the action of temperature change can be conducted and diffused to the ultra-light weight structure by the flexible joints, so that the three-point supporting position is stable;
wherein the ultra-lightweight structure constructs an inner conductive region and an outer conductive region.
Specifically, the mirror has a mirror body portion on which the ultra-lightweight structure is mounted;
the ultra-lightweight structure includes:
a conductive ring located in the center of the mirror portion;
a diffusion part located on the outer contour of the mirror body part;
the diffusion part takes the center of the reflecting mirror as the center of the diffusion part;
and a plurality of connection diffusion ribs connecting the conductive ring and the diffusion part and forming light-weight gaps at equal intervals.
Specifically, the method further comprises the following steps:
the regular polygon structure frame forms the inner conduction area from the conduction ring, and the inner conduction area is provided with thick connecting ribs;
the regular polygon structure frame forms an outer conducting area from the diffusion part;
the outer conducting area is provided with thin connecting ribs.
Specifically, the reflector plate has a connection portion that is welded to the conductive ring.
Specifically, the outer conductive region is further connected with a plurality of conductive sheets, and the end parts of adjacent conductive sheets are connected to form a triangular region.
Specifically, three flexible joint connecting positions which are arranged in a triangular shape are constructed on the reflector supporting plate;
the connecting part is connected with the flexible joint connecting position through the conducting part.
Specifically, the method further comprises the following steps:
the first embedded part is embedded at the joint of the reflector supporting plate and the flexible joint, so that the three flexible joints can be coplanar through grinding and repairing operations;
the flexible joint is connected with the reflector supporting plate through a screw.
Specifically, the flexible joint is provided with a pin hole, and the reflector back plate is connected with the pin hole through a pin.
Specifically, an embedded part corresponding to the pin hole is arranged on the reflector back plate.
The invention has the following beneficial effects:
on the first hand, the technical scheme provides a design of separating a reflector 1 from a related supporting part two bodies based on the idea of avoiding the direct action of connecting stress on a reflector body; therefore, the stress caused by the processing precision and connected with the mirror body and the mirror back plate 4 is not directly applied to the mirror body due to the change of the transfer path, so that the stress cannot be directly mapped to the mirror surface of the mirror, and the problem that three points of the mirror surface are locally deformed by three back fulcrums under the action of gravity and temperature change is avoided, thereby being beneficial to realizing higher surface type precision.
In the second aspect, the mirror body is circularly symmetrical, the structure with high specific stiffness and ultra-light weight is designed, the self-body is well stressed, and the mirror body deforms circularly symmetrically in the optical axis direction under the action of uniformly distributed gravity and temperature loads, so that the influence on the force/thermal deformation of the reflector applied in space is less, and the stability of the mirror body can be improved.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of an ultra-lightweight structure according to the present invention;
FIG. 3 is a schematic view of a mirror plate of the present invention;
FIG. 4 is a schematic view of a flexible segment of the present invention;
FIG. 5 is a schematic view of a mirror backplane connection of the present invention;
FIG. 6 is a schematic diagram of a prior art embodiment;
fig. 7 is a schematic layout of the outer conductive region and the inner conductive region.
The reference numerals in the figures denote:
the device comprises a reflector 1, an ultra-lightweight structure 10, a reflector supporting plate 2, a flexible joint 3 and a reflector back plate 4;
the structure comprises a conductive ring 11, a diffusion part 12, a diffusion rod 13, a regular polygon structure frame 30, a connecting part 202, a conductive sheet 14, a triangular area 15, a conductive part 201 and a flexible joint connecting position 203;
a first embedded part 5 and a second embedded part 6.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention; for convenience of description, in the present application, the left side is a "first end", the right side is a "second end", the upper side is a "first end", and the lower side is a "second end" in the current view, so that the description is for the purpose of clearly expressing the technical solution, and should not be construed as an improper limitation to the technical solution of the present application.
Conventional heavy-calibre speculum adopts the three point support mode as the speculum supported mode more, supports gentle festival size less, supports gentle festival and speculum lug connection, and there is the same use problem of direction of stress and transfer path of force in this kind of structure, when receiving the thermal stress effect of gravity or temperature, because the direction of stress is unanimous with transfer path of force, leads to stress and strain all to transmit to the mirror surface on for speculum face type precision descends. In order to reduce this effect it is desirable to,
the invention relates to an efficient reflector three-point supporting structure, which is suitable for back support of meter-grade large-curvature circular reflectors made of various materials and can be used for supporting and connecting high-precision and high-light telescopes of foundations, empty foundations and space foundations.
The invention provides a supporting and connecting structure for a reflector with a larger caliber by using a smaller three-point supporting radius through changing a stress and force transmission path, and has mechanical and temperature environment adaptability.
The invention provides a two-body separation design of a reflector support structure based on the idea of avoiding the direct action of connection stress on a reflector body. Firstly, designing a lens body into a high-rigidity and ultra-light structure 10, and after the high-precision requirement is met through simulation optimization, installing a peripherally-expandable supporting plate structure with three flexible joints and lower rigidity; and integrated simulation is implemented, comprehensive achievement is achieved, and meanwhile high stability under connection stress is met.
Referring to fig. 1-5, a specific technical solution is a high-efficiency reflector three-point supporting structure, which includes:
a mirror 1 which constructs an ultra lightweight structure 10;
a reflector plate 2 connected to the ultra lightweight structure 10;
the flexible sections 3 are connected with the reflector supporting plate 2 through screws;
the plurality of flexible joints 3 can be connected with the reflector back plate 4, and the plurality of flexible joints 3 can form three-point supporting positions on the ultra-lightweight structure 10 and the reflector back plate 4 respectively so as to change and/or change in gravity;
the acting force generated under the action of temperature change can be transmitted to the ultra-light weight structure 10 by the flexible joints 3 for diffusion, so that the three-point supporting position is stable;
wherein the ultra-lightweight structure 10 forms an inner conductive region 1001 and an outer conductive region 1002.
The technical scheme has the advantages that different from the traditional reflector supporting structure which directly acts on the reflector body, at least three flexible joints are arranged on the triangular reflector supporting plate, the flexible joints are relatively independent of the reflector body, and the supporting structure for the reflector is formed by considering the problem of compact structure between the supporting plate and the reflector body;
the support plate can be welded on the connecting ring surface of the reflector body through a secondary sintering process without influencing the manufacture of the lightweight structure of the reflector body.
The reflector supporting plate 2 and the reflector body are only connected through the connecting ring surface, are not limited by the reflector body and can be expanded to the periphery, and the force of the flexible joint 3 is transmitted to the high-rigidity ultra-lightweight structure 10 through the reflector supporting plate 2, so that the influence of the supporting connecting force on the deformation of the reflector body is reduced while the force transmission path is increased;
by combining finite element simulation, the SiC reflector high-precision (lambda/50) high-light weight (92.61%) support for the space larger than phi 1.5m can be realized under the condition of a small three-point support coupling radius;
the invention is suitable for all reflectors, especially for large-curvature ceramics, glass and metal.
In one embodiment, referring to fig. 2 and 5, the reflector 1 has a mirror body portion, and the ultra-lightweight structure 10 is mounted on the mirror body portion;
the ultra lightweight structure 10 includes: a conductive ring 11 located at the center of the mirror portion; a diffusion part 12 located on the outer contour of the mirror body; the diffusion portion 12 has the center of the mirror itself as the center; the plurality of coupling diffusion ribs 13 couple the conductive ring 11 and the diffusion portion 12, and form light-weight gaps at equal intervals.
In one embodiment, please refer to fig. 1-5, which further includes: a regular polygonal structural frame 30 disposed between the conductive ring 11 and the diffuser portion 12; the regular polygonal structural frame 30 has a circumscribed virtual circle concentric with the conductive ring 11.
An inner conducting area 1001 is formed from the regular polygon structural frame 30 to the conducting ring 11, and thick connecting ribs 131 are arranged in the inner conducting area;
the regular polygonal structural frame 30 to the diffuser 12 form an outer conductive region 1002;
the outer conductive areas 1002 are provided with thin connecting ribs 132.
Therefore, according to the mode, different areas of the reflector are grouped according to a certain rule, the thicknesses of the reflector support ribs in different areas are different, the ribs are required to be designed into a closed structure in an important area to strengthen the integral support of the reflector, the shape precision of the reflector can be gradually improved by controlling the thickness of the support ribs, the integral quality of the reflector is reduced, and the purpose of ultra-lightness of the reflector is achieved.
In one embodiment, as shown in fig. 1-5, the reflector plate 2 has a connecting portion 202, and the connecting portion 202 is welded to the conductive ring 11.
The outer conductive region is further connected with a plurality of conductive sheets 14, and the ends of adjacent conductive sheets 14 are connected to form a triangular region 15.
Three flexible joint connecting positions 203 which are arranged in a triangular shape are constructed on the reflector supporting plate 2;
the connection portion 202 is connected to the flexible joint connection portion 203 through the conductive portion 201.
Also comprises:
the first embedded part 5 is embedded to the joint of the reflector supporting plate 2 and the flexible joint 3, so that the three flexible joints 3 can be coplanar through grinding and repairing operations;
the flexible joint 3 is connected with the reflector supporting plate 2 through a screw.
The flexible joint 3 is provided with a pin hole, and the reflector back plate 4 is connected with the pin hole through a pin.
And a second embedded part 6 corresponding to the pin hole is arranged on the reflector back plate 4.
The transition structure that speculum layer board 2 is connected for gentle festival 3 and speculum 1, when gravity and temperature variation produce stress, because the existence of speculum layer board 2, make the direction of transfer of stress and because the direction that the stress produces the strain change, lead to speculum 1 and gentle festival 3 stress that receives can not all be used in on its body, simultaneously because the structure and the position reason of speculum layer board 2, make the mirror surface influence of stress to speculum 1 reduce, can guarantee the mirror surface shape precision.
Because the reflector 1 is designed by adopting the ultra-lightweight structure 10, the supporting mode of the reflector 1 can realize small-curvature circular support, finite element simulation is established for the two reflector components in the upper figure, and statics simulation analysis is carried out, and the results are as follows, corresponding to the figures 5 and 6;
the ultra-lightweight structure 10 belongs to the support of the reflector 1, and as can be seen from the comparison simulation result, when the gravity load direction is X, Y, the surface shape accuracy of the two support modes is almost the same, but when the gravity load is in the Z direction (optical axis direction), due to the structural design of the ultra-lightweight and reflector support plate, the whole weight of the reflector assembly is lighter, and meanwhile, the stress transmission in the optical axis direction is changed, so that the surface shape of the ultra-lightweight support is superior to that of the conventional support. When the support expands under heat, the surface shape of the ultra-light weight support is better than that of the conventional three-point support due to the reason.
From the results of modal analysis, it can be seen that the first-order resonant frequency of the support of the ultra-lightweight structure 10 is 139.256, which can meet the design and use requirements (not less than 100 Hz), and the first-order resonant frequency is lower than that of the conventional three-point support mode, which indicates that the ultra-lightweight support design has better flexibility and has better protection effect on the whole reflector when subjected to low-frequency sinusoidal vibration and random vibration.
Equivalently, by changing the stress and force transmission path, a supporting and connecting structure for realizing the larger-caliber reflector by using a smaller three-point supporting radius is provided, and meanwhile, the supporting and connecting structure has mechanical and temperature environment adaptability.
In conclusion, the invention provides a design of separating the reflector from the two bodies of the supporting structure based on the idea of avoiding the direct action of the connecting stress on the reflector; firstly, designing a mirror body into a high-rigidity and ultra-light structure, and after the high-precision requirement is met through simulation optimization, installing a peripherally-expandable supporting plate structure with three flexible joints and lower rigidity; and integrated simulation is implemented, the design requirement is comprehensively met, and meanwhile, the high stability under the connection stress is met.
In addition, because the mirror body is circularly symmetrical, a structure with high specific stiffness and ultra-light weight is easy to form, the mirror body is good in stress, and circularly symmetrical deformation is carried out in the direction of an optical axis under the action of uniformly distributed gravity and temperature loads, the force/thermal deformation of the reflector applied in space is far smaller than that of a back direct-connection three-pivot structure, and the support with larger caliber (phi 1.5 meters) can be realized; although the reflector deforms in a non-circular symmetrical mode in the direction perpendicular to the optical axis, the reflector can achieve the effect that the caliber of the reflector is far larger than that of a back three-pivot (phi 0.5 m) circular reflector due to the specific stiffness structure of the reflector. Because the reflector supporting plate is a transition piece connected with the flexible joint and the reflector, the stress caused by the processing precision and connected with the back plate is not directly applied to the reflector due to the change of a transmission path, so that the stress is not directly mapped to the mirror surface of the reflector, and the problem that three points of the mirror surface are locally deformed under the action of gravity and temperature change by three back supporting points is avoided, thereby being beneficial to realizing higher surface type precision;
because the linear expansion coefficients of the second embedded part 6 and the reflector supporting plate 2 are matched or similar, the stress and strain generated by the linear expansion coefficients of the reflector supporting plate 2 and the flexible joint 3 can be released through the flexible joint 3 when the temperature changes, and the thermal strain of the connecting part is reduced;
therefore, the flexible joint 3 is separated from force transmission by adopting the structure, the structure 10 with high specific rigidity and ultra-light weight of the mirror body is adopted, and the support of the large-curvature circular large-caliber reflecting mirror is realized by adopting a material matching mode.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. An efficient mirror three point support structure, comprising:
a reflector (1) which constructs an ultra lightweight structure (10);
a reflector plate (2) connected to the ultra lightweight structure (10);
a plurality of flexible segments (3), wherein the flexible segments (3) are connected with the reflector supporting plate (2) through screws;
the flexible joints (3) can be connected with a reflector back plate (4), and the flexible joints (3) can form three-point supporting positions on the ultra-light weight structure (10) and the reflector back plate (4) respectively so as to change and/or change in gravity;
the acting force generated under the action of temperature change can be transmitted to the diffusion by the flexible joints (3) through the ultra-light weight structure (10) so as to stabilize the three-point supporting position;
wherein the ultra-lightweight structure (10) configures an inner conductive region (1001) and an outer conductive region (1002).
2. A high efficiency mirror three point support structure as claimed in claim 1, wherein said mirror (1) has a mirror body portion, said ultra lightweight structure (10) being mounted on said mirror body portion;
the ultra-lightweight structure (10) includes:
a conductive ring (11) located in the center of the mirror portion;
a diffusion part (12) located on the outer contour of the mirror body part;
the diffusion part (12) takes the center of the reflecting mirror as the center of the diffusion part;
and a plurality of connecting diffusion ribs (13) connecting the conductive ring (11) and the diffusion part (12) and forming light-weight gaps at equal intervals.
3. A high efficiency mirror three point support structure as claimed in claim 2, further comprising:
a regular polygonal structural frame (30) disposed between the conductive ring (11) and the diffuser portion (12);
the regular polygon structure frame (30) has a circumscribed virtual circle concentric with the conductive ring (11).
4. A high efficiency mirror three point support structure as claimed in claim 3, wherein said regular polygon frame (30) to said conductive ring (11) forms said inner conductive area (1001) provided with thick connecting ribs (131);
the regular polygonal structural frame (30) to the diffuser portion (12) forming an outer conducting area (1002);
the outer conductive region (1002) is provided with thin connecting ribs (132).
5. An efficient mirror three point support structure as claimed in claim 4, characterized in that the mirror support plate (2) has a connection portion (202), and the connection portion (202) is welded to the conductive ring (11).
6. A high efficiency mirror three point support structure as claimed in claim 4,
the outer conducting region is also connected with a plurality of conducting sheets (14), and the end parts of the adjacent conducting sheets (14) are connected to form a triangular region (15).
7. A high efficiency mirror three point support structure as claimed in claim 5,
three flexible joint connecting positions (203) which are arranged in a triangular shape are constructed on the reflector supporting plate (2);
the connecting part (202) is connected with the flexible joint connecting position (203) through a conducting part (201).
8. A high efficiency mirror three point support structure as claimed in claim 7, further comprising:
the first embedded part (5) is embedded to the joint of the reflector supporting plate (2) and the flexible joint (3) so that the three flexible joints (3) can be coplanar through a grinding operation;
the flexible joint (3) is connected with the reflector supporting plate (2) through a screw.
9. The high efficiency mirror three-point support structure according to claim 8, wherein the flexible joint (3) is provided with a pin hole, and the mirror back plate (4) is connected with the pin hole by a pin.
10. The high efficiency mirror three point support structure of claim 9, wherein a second embedment (6) is provided on the mirror back plate (4) corresponding to the pin holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211224406.9A CN115437103A (en) | 2022-10-09 | 2022-10-09 | Efficient reflector three-point supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211224406.9A CN115437103A (en) | 2022-10-09 | 2022-10-09 | Efficient reflector three-point supporting structure |
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| Publication Number | Publication Date |
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| CN115437103A true CN115437103A (en) | 2022-12-06 |
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| CN202211224406.9A Pending CN115437103A (en) | 2022-10-09 | 2022-10-09 | Efficient reflector three-point supporting structure |
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| CN (1) | CN115437103A (en) |
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