CN-116256865-B - High-resolution coaxial space camera primary and secondary mirror supporting structure

Abstract

The invention discloses a high-resolution coaxial space camera primary and secondary mirror supporting structure, which relates to the technical field of space remote sensing and comprises a primary mirror back plate, wherein a carbon fiber composite material is adopted for integrally manufacturing and forming, the assembly and debugging process is simplified, the installation time is shortened, the development efficiency is improved, the position precision between primary and secondary mirrors is ensured, the stability of the supporting structure is improved, heat energy can be generated when the working is started, a heat dissipation plate is arranged to absorb the heat energy, antimony regulus connected with the heat dissipation plate is contracted due to the heat energy, and expansion is performed due to the fact that the temperature of space is too low, at the moment, a heat dissipation stabilizing mechanism and a bending mechanism are hinged, so that a connected lifting plate can reciprocate, and a fixing plate connected with the heat dissipation stabilizing mechanism can stabilize a variable cross section supporting inclined frame in the process, thereby enhancing the stability of the space camera primary and secondary mirror supporting structure, and prolonging the service life of the space camera primary and secondary mirror supporting structure without damaging parts due to overheating.

Inventors

• LIU XIAOHAN
• GU KAIHUI
• LI MEIXUAN
• FENG YUESHU
• LI NAN

Assignees

• 吉林工程技术师范学院

Dates

Publication Date

20260508

Application Date

20230224

Claims (4)

1. 1. The main and secondary mirror supporting structure of the high-resolution coaxial space camera comprises a main mirror backboard (1), wherein a main reflecting mirror seat (3) is movably connected to a middle shaft at the top of the main mirror backboard (1), a radiating plate (2) is fixedly connected to the bottom of the main mirror backboard (1), and the radiating plate (2) is in an irregular bending plate shape and is characterized by further comprising a main mirror base, a main mirror base and a main mirror base; the device comprises a thin-wall barrel type mechanism (201), wherein the thin-wall barrel type mechanism (201) comprises a stable base mechanism (401) fixedly connected to the top of a main mirror backboard (1), a stable main mirror mechanism (402) is fixedly connected to a middle shaft of the middle end of the stable base mechanism (401), and a stable secondary mirror mechanism (403) is fixedly connected to the inner wall of the top of the stable base mechanism (401); The exoskeleton stabilizing mechanism (202) comprises three heat dissipation mechanisms (205) fixedly connected to the inner wall of the top of the heat dissipation plate (2), three heat dissipation stabilizing mechanisms (206) are fixedly connected to the middle axis of the top of the heat dissipation plate (2), a bending mechanism (204) is fixedly connected to the middle axis of the right wall inside the bottom end of the heat dissipation mechanism (205), and a supporting stabilizing mechanism (203) is fixedly connected to the right end of the bottom of the heat dissipation mechanism (205); The heat dissipation mechanism (205) comprises a limiting shell (9) fixedly connected to the inner wall of the top of the heat dissipation plate (2), the left end of the top of the inner wall of the limiting shell (9) is fixedly connected with antimony regulus (51), the left wall of the antimony regulus (51) is fixedly connected to the inner wall of the top end of the heat dissipation plate (2), and the middle shaft of the bottom end of the right wall of the antimony regulus (51) is fixedly connected with a connecting plate (49); The bending mechanism (204) comprises a fixed rod (48) fixedly connected to the middle axis of the inner wall of the connecting plate (49), a rotating plate (47) is rotatably connected to the middle axis of the outer wall of the fixed rod (48), and a connecting rod (46) is rotatably connected to the inner wall of the bottom end of the rotating plate (47); The support stabilizing mechanism (203) comprises lifting plates (44) which are respectively connected with the outer walls of the front end and the rear end of the connecting rod (46) in a rotating mode, a limiting rod (45) is connected with the inner wall of the middle end of the lifting plate (44) in a rotating mode, a fixing plate (42) is fixedly connected to the middle shaft of the right end of the bottom of the limiting shell (9), the middle shaft of the inner wall of the bottom end of the fixing plate (42) is fixedly connected to the front end and the rear end of the limiting rod (45), and a stabilizing plate (15) is fixedly connected to the left wall of the lifting plate (44); The heat dissipation stabilizing mechanism (206) comprises an antimony plate (8) fixedly connected to the middle shaft at the top of the heat dissipation plate (2), a sponge block (41) is fixedly connected to the left wall of the antimony plate (8), and the left wall of the sponge block (41) is movably connected to the outer wall of the secondary mirror flexible support (21).
2. 2. The high-resolution coaxial space camera primary and secondary mirror supporting structure according to claim 1, wherein the stabilizing base mechanism (401) comprises three embedded parts I (19) fixedly connected to the inner walls around the top of the primary mirror back plate (1), back plate connecting rings (4) are fixedly connected to the periphery of the top of the primary mirror back plate (1), three embedded parts II (23) are fixedly connected to the inner parts of the outer walls of the back plate connecting rings (4), a variable cross-section supporting inclined frame (5) is fixedly connected to the top of the back plate connecting rings (4), a secondary mirror support connecting ring (6) is fixedly connected to the top of the variable cross-section supporting inclined frame (5), and three embedded parts III (7) are fixedly connected to the inner walls of the top of the secondary mirror support connecting rings (6).
3. 3. The high-resolution coaxial space camera primary and secondary mirror supporting structure according to claim 2, wherein the stable primary mirror mechanism (402) comprises three flexible hinges (31) fixedly connected with inner walls at the bottom center axis of the top of the primary mirror back plate (1), the outer walls at the top ends of the flexible hinges (31) are rotatably connected with the inner walls at the bottom center axis of the primary mirror base (3), and the top of the primary mirror base (3) is fixedly connected with a primary mirror (22).
4. 4. The main secondary mirror supporting structure of the high-resolution coaxial space camera of claim 3, wherein the stable secondary mirror mechanism (403) comprises three secondary mirror supports (14) which are respectively and fixedly connected to the inner walls of the secondary mirror support connecting rings (6), the inner walls of the three secondary mirror supports (14) are fixedly connected with secondary mirror bases (11), the four peripheral inner walls of the tops of the secondary mirror bases (11) are respectively and fixedly connected with three embedded parts (12), the bottom of the secondary mirror bases (11) is fixedly connected with a secondary mirror flexible support (21), and a secondary mirror (13) is fixedly connected to a central shaft of the tops of the secondary mirror flexible supports (21).

Description

High-resolution coaxial space camera primary and secondary mirror supporting structure Technical Field The invention relates to the technical field of space remote sensing, in particular to a high-resolution coaxial space camera primary and secondary mirror supporting structure. Background The coaxial space camera has small volume and light weight, is mostly used in micro-nano satellite photoelectric load, but has the limit of receptor volume and weight, and the space resolution is generally above the meter level. In order to improve the ground pixel resolution of the micro-nano satellite remote sensing camera and realize sub-meter imaging, a long-focus and large-aperture coaxial three-mirror optical system is generally adopted, so that the problems of long relative distance between a main mirror and a secondary mirror, difficult guarantee of position precision, low resonant frequency, poor stability, high blocking ratio and the like are caused. The support structure between the primary and secondary mirrors is used as the primary support structure of the space camera, provides an interface for installation and positioning of each mirror assembly, and needs to ensure that the relative position precision and the surface shape precision of the optical element are kept unchanged under the influence of severe mechanical environments such as temperature change, emission, on-orbit running and the like. Compared with the optical element, the primary and secondary mirror support structure occupies a large proportion in the total weight of the camera, so that under the premise of ensuring high rigidity and high stability, the ultra-lightweight optimization design of the primary and secondary mirror support structure is one of key technologies for developing the space camera. The main primary and secondary mirror support forms of the coaxial space camera comprise a support rod type, a thin-wall bearing cylinder type, a truss type and the like. The support rod type has the advantages of simple form, convenient assembly and adjustment, light weight and the like, is widely applied to space cameras with higher light weight degree, has poor stability, and is widely applied to space cameras with small caliber and small primary and secondary mirror distance. The thin-wall cylinder structure has the characteristics of high rigidity, high stability, convenience in processing and detection and the like, but has larger mass. The truss structure is widely applied to space cameras, has the advantages of high rigidity, flexible assembly, light weight, strong designability and the like, can reduce the processing and manufacturing difficulty, is mainly in a split type structure at present, needs a plurality of parts to be assembled one by one, is easy to introduce assembly stress, and has complex disassembly and assembly process. The high-resolution coaxial space camera primary and secondary mirror supporting structure is provided for solving the technical problems of poor stability, low fundamental frequency, large mass, complex processing and adjusting process and the like of a primary supporting structure caused by large distance between primary and secondary mirrors. The device meets the requirements of high rigidity, high stability and ultra-light weight, and designs a long-distance carbon fiber composite material variable-section hollow cross primary and secondary mirror supporting structure. The integrated optimization design of the primary mirror and secondary mirror supporting structure simplifies the assembly and debugging process, ensures the position precision between the primary mirror and the secondary mirror and the shape precision of the primary mirror and the secondary mirror, and meets the requirements of the high-resolution space camera on high rigidity, high stability, low obscuration and ultra-light weight of the primary mirror and secondary mirror supporting structure. Disclosure of Invention The invention provides a main and secondary mirror supporting structure of a high-resolution coaxial space camera, which comprises a main mirror backboard, wherein a main mirror seat is movably connected to a top center shaft of the main mirror backboard, a radiating plate is fixedly connected to the bottom of the main mirror backboard, the radiating plate is irregularly bent and plate-shaped, the high-resolution coaxial space camera further comprises a thin-wall cylinder mechanism, the thin-wall cylinder mechanism comprises a stable base mechanism fixedly connected to the top of the main mirror backboard, a stable main mirror mechanism is fixedly connected to a center shaft at the middle end of the stable base mechanism, a stable secondary mirror mechanism and an exoskeleton stabilizing mechanism are fixedly connected to the top inner wall of the stable base mechanism, the exoskeleton stabilizing mechanism comprises three radiating mechanisms fixedly connected to the top inner wall of the radiating plate, three radiating