CN112285873A - Optical-mechanical structure reflector statically-fixed supporting structure based on three-point spherical hinge - Google Patents
Optical-mechanical structure reflector statically-fixed supporting structure based on three-point spherical hinge Download PDFInfo
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- CN112285873A CN112285873A CN202011185247.7A CN202011185247A CN112285873A CN 112285873 A CN112285873 A CN 112285873A CN 202011185247 A CN202011185247 A CN 202011185247A CN 112285873 A CN112285873 A CN 112285873A
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- spherical hinge
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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
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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
- G02B7/185—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors with means for adjusting the shape of the mirror surface
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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
- G02B7/198—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors with means for adjusting the mirror relative to its support
Abstract
The utility model provides a ray apparatus structure speculum statically determinate bearing structure based on three point spherical hinges, includes three sets of the same spherical hinge joint bearing assembly, all includes bush, spherical hinge clamping ring, spherical hinge back shaft, pole setting ring flange and flexible compact structure. The bushing is bonded with the optical-mechanical structure reflector, the spherical hinge is arranged in the bushing and fixed by the spherical hinge pressing ring, the spherical hinge supporting shaft penetrates through the spherical hinge, two ends of the spherical hinge supporting shaft are fixed on the vertical rod flange plates through two vertical rods, the flexible pressing structure is a pressing structure with a head embedded with a flexible material and pre-tightening pressure, and gaps among the optical-mechanical structure reflector, the spherical hinge and the sliding shaft are eliminated. The single set of spherical hinge joint bearing assembly can restrain 2 direction translation freedom degrees vertical to the axial direction, 1 axial translation freedom degree and 3 rotation freedom degrees are released, the included angle of the three sets of assemblies is 120 degrees, 6 direction freedom degree restraint of the optical mechanical structure reflector is realized, no redundant restraint is realized, and the statically determinate support of the optical mechanical structure reflector is realized.
Description
Technical Field
The invention belongs to the technical field of space optical remote sensors, relates to a supporting device for a large-caliber reflector of a space optical camera and a remote sensor, and is characterized by being applied to a three-point spherical hinge and a sliding bearing supporting structure of the large-caliber reflector.
Background
In the field of aerospace optical remote sensors, the requirements on the relative position and surface shape accuracy of a camera reflector are extremely high, and the change of the position and surface shape accuracy of the optical reflector is possibly caused by more reasons, including the difference of gravity environments of the ground and after orbit entering, the vibration environment in the launching stage, vacuum, low temperature, the change of heat flow outside the camera and the like. The shape accuracy and the position accuracy of the reflecting mirror directly affect the imaging quality of the optical system, so that the supporting structure of the optical reflecting mirror is required to have good structural stability and environmental adaptability.
The main support structure forms of the reflector are two types:
1) glue suspension dress frame structure. The optical lens is supported by a supporting frame structure which is usually adopted for reference, three points are axially clamped and positioned, and a plurality of glue spots on the back are supported in an auxiliary mode; the radial direction is positioned through optical centering, and a glue spot radial support is injected at the position of the mass center surface of the reflector; the side surface glue spot containment reflector is in radial translation, and the back glue spot is an auxiliary support;
2) a multi-point support structure. The optical reflector is characterized in that a metal or nonmetal embedded block matched with the thermal property of a reflector material is bonded at the supporting point of the optical reflector, a supporting structure is connected with the embedded block, and the constraint of six degrees of freedom of the reflector is realized through the constraint combination supported by each point.
The glue suspension framing structure is relatively simple, easy to realize, common in a small-caliber reflector supporting structure, the ratio of the weight of the supporting mode supporting structure to the weight of the reflector is large, when the caliber of the reflector is large, the weight of the supporting structure is increased rapidly, the shape quality of the reflector surface is difficult to guarantee, and the glue suspension framing structure is not suitable for supporting the large-caliber reflector.
The multipoint support structure comprises a flexible blade, a spherical hinge, a flexible hinge, a Bipod structure and the like, and for the round reflector with a middle and small caliber, the rigidity of the multipoint support structure is better, and back multipoint support or side multipoint support can be adopted; for a large-caliber circular reflector, a mode of only supporting the side surface is rarely seen, and the mode of combining the back support and the back side surface is mostly seen; while the more common support for rectangular mirrors occurs by side and back supports.
In a multipoint supporting mode for the large-aperture reflector, the number of supporting points, the supporting position, the shape of the reflector, the flexible structure and the like of a multipoint supporting structure are mutually influenced; the mode that back support and side support combined together requires the picture frame can envelop the speculum, and bearing structure is bulky, weight is heavy, for avoiding the picture frame to warp and arouse that the speculum face shape changes, requires the picture frame to have higher rigidity, and the efficiency ratio of bearing structure weight and speculum weight is lower, can not be fine adaptation speculum super large bore direction development's technical route.
Disclosure of Invention
The technical problem solved by the invention is as follows: the shortcomings of the prior art are overcome, the optical mechanical structure reflector statically determinate supporting structure based on the three-point spherical hinge is provided, and statically determinate supporting of the reflector with high stability and high surface shape precision is achieved.
The technical solution of the invention is as follows:
a ray apparatus structure speculum statically determinate bearing structure based on three point spherical hinge includes: the three spherical hinge joint bearing assemblies are distributed at an angle of 120 degrees, have the same structural composition and respectively comprise a bushing, a spherical hinge pressing ring, a spherical hinge supporting shaft, an upright rod flange plate and a flexible pressing structure;
the bushing is connected with the reflector through gluing, the spherical hinge is arranged inside the bushing, and the spherical hinge pressing ring is assembled with the bushing through processing threads on the outer surface of the spherical hinge pressing ring and tightly presses the spherical hinge; the spherical hinge support shaft penetrates through the spherical hinge with a gap, the spherical hinge can slide along the axial direction of the spherical hinge support shaft, two ends of the spherical hinge support shaft are respectively connected with the lower ends of the two upright rods, the upper ends of the two upright rods are fixedly connected with the upright rod flange, the center of the upright rod flange is provided with an interface which is installed with the flexible pressing structure, the upper end of the flexible pressing structure is connected with the upright rod flange through threads, and the lower end of the flexible pressing structure is contacted with the back of the reflector;
the upright rod flange plate is provided with an installation interface with the optical machine main body, and the whole supporting structure and the reflector are assembled on the optical machine main body.
Furthermore, the axial extension lines of the three spherical hinge support shafts are intersected at one point.
Furthermore, the spherical hinge comprises an inner ring and an outer ring, the contact surface between the inner ring and the outer ring is a spherical surface, the outer ring is assembled with the bush in a clearance mode, the spherical hinge pressing ring presses the outer ring of the spherical hinge tightly, and the contact surface between the inner ring and the outer ring needs to be subjected to cold welding prevention treatment when the spherical hinge is used in a vacuum environment.
Furthermore, the contact surface of the spherical hinge and the spherical hinge support shaft is lubricated, and when the spherical hinge support shaft is used in a vacuum environment, the contact surface of the spherical hinge support shaft and the spherical hinge inner ring needs to be subjected to cold welding prevention treatment.
Furthermore, the lower end of the flexible pressing structure is made of flexible materials.
Furthermore, the contact pressure between the flexible end head of the flexible pressing structure and the back of the reflector is adjusted by adjusting the screwing depth of the flexible pressing structure on the vertical rod flange plate, so that the gap between the spherical hinge and the spherical hinge supporting shaft is eliminated.
Furthermore, the spherical hinge can slide along the axial direction of the spherical hinge support shaft, and meanwhile, the outer ring of the spherical hinge can rotate around the axial direction of the inner ring or any two orthogonal radial directions, so that the release of three rotational degrees of freedom Rx, Ry and Rz around the spherical hinge support shaft and the release of the translational degree of freedom Tz along the axial direction are realized, and the Tx and Ty translational degrees of freedom in the vertical axial direction are restrained.
Furthermore, for the reflector needing to be supported, each spherical hinge joint bearing assembly restrains two translational freedom degrees vertical to the respective axial direction, and the three groups of spherical hinge joint bearing assemblies realize six-freedom-degree restraint of the reflector.
Further, the lining material is a metal or non-metal material matched with the thermal expansion coefficient of the reflector material.
Furthermore, the lining is made of invar steel.
Compared with the prior art, the invention has the advantages that:
(1) the three sets of spherical hinges and sliding bearing structures realize statically determinate support of the large-scale optical-mechanical structure reflector, no redundant constraint exists, the three sets of structures are mutually independent, processing, assembly and adjustment are facilitated, and engineering realization is easy;
(2) the spherical hinge structure has the characteristics of high precision and high stability, so that the surface shape of the reflector supported by the spherical hinge structure also has high precision and high stability, and the reflector surface shape is kept unchanged after environmental tests.
(3) The spherical hinge and sliding bearing structure adopts the double vertical rods for supporting, so that the rigidity of the supporting structure is improved, and the stability is further improved;
(4) the spherical hinge and sliding bearing support structure has small volume, light weight and high design flexibility, and can be applied to large-caliber ultrathin reflectors or other optical surface-sensitive reflector support structures.
(5) The supporting structure of the invention has small influence on the surface shape of the reflector, and the reflector has high precision and high stability. The three-point spherical hinge and sliding bearing support structure has light weight, good stability and high application value in the support of the large-caliber reflector.
Drawings
FIG. 1 is a view of the structure of a three-point spherical hinge and a sliding bearing support device according to the present invention;
FIG. 2 is a cross-sectional view of the three-point spherical hinge and sliding bearing support arrangement of the present invention;
FIG. 3 is a view showing the structure of the mirror supporting apparatus according to the present invention;
FIG. 4 is a partial cross-sectional view of a mirror support structure according to the present invention;
FIG. 5 is a schematic diagram of the degree of freedom constraint of the three-point spherical hinge and the sliding bearing support device of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
The invention provides a static support structure of an optical mechanical structure reflector based on a three-point spherical hinge, wherein a three-point support structure is adopted at the back of a large-diameter reflector, 6-direction freedom degree constraint is realized by utilizing a spherical hinge joint bearing assembly, no redundant constraint is generated, static support of the optical mechanical structure reflector is realized, and good surface shape precision and stability can be realized.
As shown in fig. 1, 2, 3, and 4, the three spherical hinge joint bearing assemblies of the large-scale opto-mechanical structure reflector statically fixed support device based on the three-point spherical hinge and the sliding bearing, which are provided by the present invention, form an angle of 120 ° between each two spherical hinge joint bearing assemblies, have the same structural composition, and each spherical hinge joint bearing assembly comprises a bushing 1, a spherical hinge pressing ring 2, a spherical hinge 3, a spherical hinge support shaft 4, an upright rod 5, an upright rod flange 6, and a flexible pressing structure 7;
the bushing 1 is connected with the reflector 8 through gluing, the spherical hinge 3 is arranged inside the bushing 1, the spherical hinge pressing ring 2 is assembled with the bushing 1 through processing threads on the outer surface, and the spherical hinge 3 is pressed tightly; the spherical hinge support shaft 4 penetrates through the spherical hinge 3 with a gap, the spherical hinge 3 can slide axially along the spherical hinge support shaft 4, two ends of the spherical hinge support shaft 4 are respectively connected with the lower ends of the two upright posts 5, the upper ends of the two upright posts 5 are fixedly connected with the upright post flange 6, the center of the upright post flange 6 is provided with an interface installed with the flexible pressing structure 7, the upper end of the flexible pressing structure 7 is connected with the upright post flange 6 through threads, and the lower end of the flexible pressing structure 7 is contacted with the back of the reflector 8;
the upright rod flange 6 is provided with an installation interface with the optical machine main body, and the whole supporting structure and the reflector 8 are assembled on the optical machine main body.
As shown in fig. 3, the axial extensions of the three spherical-hinge support shafts 4 meet at a point.
The spherical hinge 3 comprises an inner ring and an outer ring, the contact surface between the inner ring and the outer ring is a spherical surface, the outer ring is assembled with the bush 1 in a clearance mode, the spherical hinge pressing ring 2 presses the outer ring of the spherical hinge 3 tightly, and the contact surface between the inner ring and the outer ring needs to be subjected to cold welding prevention treatment when the spherical hinge is used in a vacuum environment.
The contact surface of the spherical hinge 3 and the spherical hinge support shaft 4 is lubricated, and when the spherical hinge support shaft is used in a vacuum environment, the contact surface of the spherical hinge support shaft 4 and the inner ring of the spherical hinge 3 needs to be subjected to cold welding prevention treatment.
The lower end of the flexible compaction structure 7 is made of flexible material. The contact pressure between the flexible end of the flexible pressing structure 7 and the back of the reflector 8 is adjusted by adjusting the screwing depth of the flexible pressing structure 7 on the upright rod flange 6, so that the gap between the spherical hinge 3 and the spherical hinge support shaft 4 is eliminated.
As shown in fig. 5, the spherical hinge 3 can slide axially along the spherical hinge support shaft 4, and simultaneously, the outer ring of the spherical hinge 3 can rotate axially around the inner ring or in any 2 orthogonal radial directions, so that the release of three rotational degrees of freedom Rx, Ry, Rz around the spherical hinge support shaft 4 and the release of the translational degree of freedom Tz along the axial direction are realized, and the translational degrees of freedom Tx, Ty in the vertical axial direction are constrained.
For the reflector 8 needing to be supported, a spherical hinge and a sliding bearing structure are respectively arranged at three positions, and the three form an included angle of 120 degrees. Each spherical hinge joint bearing assembly constrains two translational degrees of freedom perpendicular to the respective axial direction, and the three groups of spherical hinge joint bearing assemblies realize six-degree-of-freedom constraints of the reflector 8.
The material of the bushing 1 is a metal or non-metal material matched with the thermal expansion coefficient of the reflector material. Preferably, the liner 1 is made of invar material.
The working principle of the invention is as follows: based on the design idea of a multipoint support structure, a large-caliber reflector adopts three-point support at the back, and each point is provided with a set of spherical hinge and a sliding bearing structure (spherical hinge joint bearing assembly), and the three form an included angle of 120 degrees. Each spherical hinge and sliding bearing structure can restrain 2 direction translation freedom degrees vertical to the axial direction, 1 axial translation freedom degree and 3 rotation freedom degrees are released, the three sets of spherical hinges and sliding bearing structures realize the restraint of 6 direction freedom degrees of the optical mechanical structure reflector, no redundant restraint is generated, and the statically determined support of the optical mechanical structure reflector is realized.
The invention solves the problem of supporting the large-caliber reflecting mirror of the space optical remote sensing camera, releases the degrees of freedom in different directions through the three-point spherical hinge and the sliding bearing structure, solves the constraint of the degrees of freedom in 6 directions of the optical-mechanical structure reflecting mirror, and realizes the high-precision and high-stability supporting of the large-caliber reflecting mirror surface shape. Meanwhile, the three-point spherical hinge and the sliding bearing structure are small in size and light in weight, the mass ratio of optical elements in the reflector component is effectively improved, and the three-point spherical hinge and the sliding bearing structure have obvious advantages in large-caliber reflector support.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. The utility model provides a quiet bearing structure that decides of ray apparatus structure speculum based on three point spherical hinge which characterized in that includes: the three spherical hinge joint bearing assemblies are distributed at an angle of 120 degrees between every two spherical hinge joint bearing assemblies, have the same structural composition and respectively comprise a bushing (1), a spherical hinge pressing ring (2), a spherical hinge (3), a spherical hinge supporting shaft (4), an upright rod (5), an upright rod flange plate (6) and a flexible pressing structure (7);
the bushing (1) is connected with the reflector (8) through gluing, the spherical hinge (3) is arranged inside the bushing (1), and the spherical hinge pressing ring (2) is assembled with the bushing (1) through processing threads on the outer surface and tightly presses the spherical hinge (3); the spherical hinge support shaft (4) penetrates through the spherical hinge (3) with a gap, the spherical hinge (3) can axially slide along the spherical hinge support shaft (4), two ends of the spherical hinge support shaft (4) are respectively connected with the lower ends of the two upright rods (5), the upper ends of the two upright rods (5) are fixedly connected with the upright rod flange (6), the center of the upright rod flange (6) is provided with an interface installed with the flexible pressing structure (7), the upper end of the flexible pressing structure (7) is connected with the upright rod flange (6) through threads, and the lower end of the flexible pressing structure is in contact with the back of the reflector (8);
the upright rod flange plate (6) is provided with an installation interface with the optical machine main body, and the whole supporting structure and the reflector (8) are assembled on the optical machine main body.
2. The opto-mechanical structured mirror statically determinate support structure based on a three-point spherical hinge as claimed in claim 1, wherein: the axial extension lines of the three spherical hinge support shafts (4) are intersected at one point.
3. The opto-mechanical structured mirror statically determinate support structure based on a three-point spherical hinge as claimed in claim 1, wherein: the spherical hinge (3) comprises an inner ring and an outer ring, the contact surface between the inner ring and the outer ring is a spherical surface, the outer ring is assembled with the bush (1) in a clearance mode, the outer ring of the spherical hinge (3) is pressed tightly by the spherical hinge pressing ring (2), and the contact surface of the inner ring and the outer ring needs to be subjected to cold welding prevention treatment when the spherical hinge is used in a vacuum environment.
4. The opto-mechanical structured mirror statically determinate support structure based on a three-point spherical hinge as claimed in claim 3, wherein: the contact surface of the spherical hinge (3) and the spherical hinge support shaft (4) is lubricated, and when the spherical hinge support shaft is used in a vacuum environment, the contact surface of the spherical hinge support shaft (4) and the inner ring of the spherical hinge (3) needs to be subjected to cold welding prevention treatment.
5. The opto-mechanical structured mirror statically determinate support structure based on a three-point spherical hinge as claimed in claim 1, wherein: the lower end of the flexible compaction structure (7) is made of flexible materials.
6. The opto-mechanical structured mirror statically determinate support structure based on a three-point spherical hinge as claimed in claim 5, wherein: the contact pressure between the flexible end of the flexible pressing structure (7) and the back of the reflector (8) is adjusted by adjusting the screwing depth of the flexible pressing structure (7) on the vertical rod flange (6), so that the gap between the spherical hinge (3) and the spherical hinge support shaft (4) is eliminated.
7. The opto-mechanical structured mirror statically determinate support structure based on a three-point spherical hinge as claimed in claim 3, wherein: the spherical hinge (3) can axially slide along the spherical hinge support shaft (4), and meanwhile, the outer ring of the spherical hinge (3) can axially rotate around the inner ring or radially rotate around any 2 orthogonal axes, so that the release of three rotational degrees of freedom Rx, Ry and Rz around the spherical hinge support shaft (4) and the release of the translational degree of freedom Tz along the axial direction are realized, and the translational degrees of freedom Tx and Ty in the vertical axial direction are restrained.
8. The opto-mechanical structured mirror statically determinate support structure based on a three-point spherical hinge as claimed in claim 3, wherein: for the reflector (8) needing to be supported, each spherical hinge joint bearing assembly restrains two translational degrees of freedom vertical to the respective axial direction, and the three groups of spherical hinge joint bearing assemblies realize six-degree-of-freedom restraint of the reflector (8).
9. The opto-mechanical structured mirror statically determinate support structure based on a three-point spherical hinge as claimed in claim 1, wherein: the material of the bushing (1) is a metal or non-metal material matched with the thermal expansion coefficient of the reflector material.
10. The opto-mechanical structured mirror statically determinate support structure based on a three-point spherical hinge as claimed in claim 9, wherein: the lining (1) is made of invar steel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011185247.7A CN112285873B (en) | 2020-10-29 | 2020-10-29 | Optical-mechanical structure reflector statically-fixed supporting structure based on three-point spherical hinge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011185247.7A CN112285873B (en) | 2020-10-29 | 2020-10-29 | Optical-mechanical structure reflector statically-fixed supporting structure based on three-point spherical hinge |
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| CN112285873A true CN112285873A (en) | 2021-01-29 |
| CN112285873B CN112285873B (en) | 2022-03-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217509A (en) * | 2021-12-16 | 2022-03-22 | 哈尔滨工业大学 | Mechanical compound eye rotation driving device based on stay-supported mechanism |
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2020
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| US20200316770A1 (en) * | 2017-12-25 | 2020-10-08 | Shenzhen Institutes Of Advanced Technology | Three-degree-of-freedom parallel mechanism |
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