An integrated support frame structure of a toothed reflector with high mechanical and thermal stability

Abstract

The present application relates to the field of aerospace optical remote sensors, and specifically discloses a toothed reflector integrated support frame structure with high mechanical and thermal stability, comprising a reflector and a support frame, wherein the support surface of the reflector is provided with a plurality of support grooves, and the support grooves extend along the edge position of the support surface of the reflector support groove toward the direction close to the axis of the reflector, and the support groove comprises a bottom wall, an end wall and two side walls, the bottom wall is located on the support surface of the reflector, the end wall starts from the end of the bottom wall close to the axis of the reflector and extends in a direction parallel to the axis of the reflector, and the side walls are located on both sides of the bottom wall and the end wall, and a plurality of support teeth are provided on the side of the support frame facing the reflector, the support teeth are clamped in the support grooves, and a glue layer is provided between the support teeth and the bottom wall, the side wall and the end wall, so as to achieve the effect of easily maintaining the surface shape of the reflector, being able to withstand a large vibration load, and having a large temperature adaptability.

Description

Technical Field

[0001] The present application relates to the technical field of aerospace optical remote sensors, and in particular to an integrated support frame structure of a toothed reflector with high mechanical and thermal stability. Background Art

[0002] The reflector is the most critical optical element in the optical system of a space remote sensing camera, and its surface accuracy has a direct impact on the image quality. Space remote sensing cameras must withstand the impact, vibration and overload during transportation and launch, as well as the impact of temperature changes in space, and must ensure the surface accuracy and position accuracy of the optical elements of the optical system. Therefore, the support mechanism of the reflector is required to ensure the stability of the reflector's position and surface accuracy.

[0003] With the improvement of the resolution of space cameras, the aperture of the main reflector is getting larger and larger. When the aperture of the main reflector exceeds Φ500mm, the traditional reflector structure design is sensitive to factors such as gravity, vibration, and temperature environment during ground installation, testing, and in-orbit operation. How to ensure the surface shape of the main reflector in the support design of large-aperture reflectors is a difficult point.

[0004] For large-aperture reflectors, traditional framed reflectors are heavy and the reflector surface shape is very sensitive to temperature and assembly stress; the three-point bipod or multi-point whiffle-tree support form has high requirements on the assembly process and has poor overload resistance. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, a large-aperture space remote sensing camera reflector support structure is provided to ensure that the reflector surface shape is easy to maintain during ground installation and testing, and can withstand large vibration loads and has greater temperature adaptability.

[0006] This application adopts the following technical solutions:

[0007] A toothed reflector integrated support frame structure with high mechanical and thermal stability comprises a reflector and a support frame, wherein the support surface of the reflector is provided with a plurality of support grooves, and the support grooves extend along the edge of the support surface of the reflector support groove in a direction close to the axis of the reflector, and the support groove comprises a bottom wall, an end wall and two side walls, the bottom wall is located on the support surface of the reflector, the end wall starts from the end of the bottom wall close to the axis of the reflector and extends in a direction parallel to the axis of the reflector, the side walls are located on both sides of the bottom wall and the end wall, and a plurality of support teeth are provided on the side of the support frame facing the reflector, the support teeth are clamped in the support grooves, and adhesive layers are provided between the support teeth and the bottom wall, the side wall and the end wall.

[0008] In the above-mentioned supporting structure, the interior of the supporting tooth is hollow, and both ends of the supporting tooth are connected, and the supporting tooth is provided with a glue injection hole that passes through the interior and the exterior of the supporting tooth.

[0009] In the above-mentioned supporting structure, the included angle between the extension direction of the bottom wall and the end wall is an obtuse angle.

[0010] In the above-mentioned supporting structure, the thickness of the adhesive layer does not exceed 0.5 mm.

[0011] In the above-mentioned supporting structure, the outer side surface of the support frame is provided with a groove extending in a direction perpendicular to the radial direction of the support frame, and the groove is provided in at least two layers along the axial direction of the support frame.

[0012] In the above-mentioned supporting structure, the grooves in two adjacent layers are staggered.

[0013] In the above-mentioned supporting structure, each layer of the cutting grooves divides the supporting frame into N equal parts along the circumference of the supporting frame, where N is an even number greater than 6.

[0014] In the above-mentioned supporting structure, a weight-reducing groove is provided on the outer side of the supporting frame.

[0015] In the above-mentioned support structure, the support surface of the reflector is provided with a plurality of mounting teeth, the mounting teeth are perpendicular to the edge position of the support surface of the reflector, the mounting teeth pass through the axis of the reflector, the mounting teeth are evenly distributed around the axis of the reflector, the surface of the support frame facing the reflector is provided with a plurality of supporting teeth, the support surface of the reflector is provided with a support ring coaxial with the reflector, the support ring is fixedly connected to the end of the mounting teeth close to the axis of the reflector, and two adjacent supporting teeth form a support groove with the support ring of its bracket.

[0016] In the above-mentioned supporting structure, the supporting surface of the reflector is provided with a plurality of reinforcing rings of different diameters, the reinforcing rings are located inside the supporting rings, and a plurality of reinforcing ribs are connected between the reinforcing rings and between the supporting rings and the reinforcing rings.

[0017] In summary, this application at least includes the following beneficial technical effects:

[0018] 1. The present invention uses grooving to achieve flexibility and damping, which can not only reduce the impact of thermal environment changes and external forced displacement on the reflector surface shape, but also provide good structural damping for the reflector, thereby improving the reflector's ability to resist mechanical overload;

[0019] 2. The implementation process of the present invention is simple, which is conducive to the rapid completion of the installation and adjustment of the reflector assembly, and is insensitive to the subsequent integrated test environment (gravity, heat, forced displacement, etc.);

[0020] 3. The reflector and the flexible unloading bracket of the present invention are both designed to be highly lightweight, but still meet the high rigidity requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the installation relationship between a single support frame and a reflector in a specific implementation manner of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a support frame in a specific implementation manner of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of a reflector in a specific implementation manner of the present invention.

[0024] Explanation of the reference numerals: 1. reflector; 11. support groove; 12. mounting tooth; 13. support ring; 14. reinforcement ring; 15. reinforcement rib; 2. support frame; 21. support tooth; 22. weight-reducing groove; 5. glue injection hole; 3. cutting groove; 4. boss. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-3 The present application is further described in detail with specific embodiments:

[0026] Reference Figure 1 A toothed reflector integrated support frame structure with high mechanical and thermal stability includes a reflector 1 and a support frame 2. The support surface of the reflector 1 is provided with a plurality of support grooves 11. The side of the support frame 2 facing the reflector 1 is provided with a plurality of support teeth 21. The support teeth 21 are clamped in the support grooves 11, and an adhesive layer is provided between the support teeth 21 and the support grooves 11.

[0027] The support groove 11 extends along the edge of the support surface of the reflector 1 toward the direction close to the axis of the reflector 1. The support groove 11 includes a bottom wall, an end wall and two side walls. The bottom wall is located on the support surface of the reflector 1. The end wall starts from the end of the bottom wall close to the axis of the reflector 1 and extends in a direction parallel to the axis of the reflector 1. The angle between the extension direction of the bottom wall and the end wall is an obtuse angle. The side walls are located on both sides of the bottom wall and the end wall. A glue layer is arranged between the bottom wall, the side wall and the end wall, and the thickness of the glue layer does not exceed 0.5 mm. The glue layer mainly undergoes shear deformation. The shear modulus of the rubber sheet is much smaller than the tensile and compressive modulus, so that the external force on the main reflector 1 is reduced, so that the shape of the main reflector 1 does not deteriorate. Specifically, the mounting groove structure can be realized by the following structure: the support surface of the reflector 1 is provided with a plurality of mounting teeth 12, the mounting teeth 12 are perpendicular to the edge position of the support surface of the reflector 1, the mounting teeth 12 pass through the axis of the reflector 1, and the mounting teeth 12 are evenly distributed around the axis of the reflector 1; the support surface of the reflector 1 is provided with a support ring 13 coaxial with the reflector 1, the support ring 13 is fixedly connected to the end of the mounting tooth 12 close to the axis of the reflector 1, and two adjacent support teeth 21 form a support groove 11 with the support ring 13 of its bracket.

[0028] In this embodiment, the reflector 1 is a SIC toothed reflector 1. The support surface of the reflector 1 is provided with a plurality of reinforcing rings 14 of different diameters, the reinforcing rings 14 are located inside the supporting rings 13, and a plurality of reinforcing ribs 15 are connected between the reinforcing rings 14 and between the supporting rings 13 and the reinforcing rings 14. This makes the bottom of the reflector 1 have a higher strength, which is conducive to maintaining its surface shape.

[0029] The interior of the supporting tooth 21 is hollow, and both ends of the supporting tooth 21 are through-connected. The supporting tooth 21 is provided with a glue injection hole 5 that passes through the inside and outside of the supporting tooth 21. A plurality of glue holes are provided, and at least two glue injection holes 5 are provided on each side of the supporting tooth 21 facing the bottom wall, side wall and end wall.

[0030] The outer side of the support frame 2 is provided with a groove 3 extending in a radial direction perpendicular to the support frame 2. The groove 3 is provided in at least two layers along the axis direction of the support frame 2, and the grooves 3 of two adjacent layers are staggered. In this embodiment, two layers of grooves 3 are provided. Each layer of grooves 3 divides the support frame 2 into N equal parts along the circumference thereof, and N is an even number greater than 6. The outer side of the support frame 2 is provided with a weight-reducing groove 22, and the weight-reducing groove 22 is evenly distributed around the support frame 2. The radial two-layer groove 3 structure forms a combined flexibility to better unload heat and assembly force. Compared with the one-layer groove 3 structure, the two-layer groove 3 structure has a thicker local thickness at the corresponding position of the rubber spot, forming a better local stiffness, which is conducive to uniform force on the rubber spot and improving the overload resistance of the reflector 1 assembly. The toothed reflector 1 and the flexible unloading support frame 2 are both designed with high light weight. After adopting the support method of the present invention, the ground adjustment and temperature change of 4°C can ensure that the surface shape change is within 0.002λ (λ=632.8mm).

[0031] The support frame 2 is provided with a plurality of circular holes, which are connected to the two ends of the slot 3 .

[0032] A boss 4 is provided on the side of the support frame 2 facing away from the reflective surface of the reflector 1, and an external interface is provided on the boss 4. The support frame 2 is screwed to the main load-bearing structure through the external interface.

[0033] The implementation principle of the present application is as follows: firstly, the support frame 2 is screwed to the main load-bearing structure, and the support groove 11 of the reflector 1 is matched with the support tooth 21 of the support frame 2. Then, the support frame 2 and the reflector 1 are centered by the tooling to ensure that the support frame 2 is concentric with the reflector 1 and the gap for glue injection is uniform. Glue is injected through the glue injection hole 5 to obtain the adhesive area 6 of the reflector 1. After the glue is cured, the installation of the support frame 2 structure and the reflector 1 is completed.

[0034] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A toothed reflector integrated support frame structure with high mechanical and thermal stability, characterized in that: The invention comprises a reflector (1) and a support frame (2), wherein a support surface of the reflector (1) is provided with a plurality of support grooves (11), the support grooves (11) extending along the edge of the support surface of the reflector (1) in a direction close to the axis of the reflector (1), the support groove (11) comprising a bottom wall, an end wall and two side walls, the bottom wall being located on the support surface of the reflector (1), the end wall extending from the end of the bottom wall close to the axis of the reflector (1) in a direction parallel to the axis of the reflector (1), the side walls being located on both sides of the bottom wall and the end wall, a plurality of support teeth (21) being provided on a side of the support frame (2) facing the reflector (1), the support teeth (21) being clamped in the support grooves (11), and adhesive layers being provided between the support teeth (21) and the bottom wall, the side wall and the end wall; The outer side surface of the support frame (2) is provided with a groove (3) extending in a direction perpendicular to the radial direction of the support frame (2), and the groove (3) is provided in at least two layers along the axial direction of the support frame (2); The outer side of the support frame (2) is provided with a weight-reducing groove (22); the outer side of the support frame (2) is provided with a weight-reducing groove (22); A boss (4) is provided on the side of the support frame (2) facing away from the reflective surface of the reflector (1), and an external interface is provided on the boss (4), and the support frame (2) is screwed to the main load-bearing structure via the external interface; the interior of the support tooth (21) is hollow, and the two ends of the support tooth (21) are connected, and the support tooth (21) is provided with a glue injection hole (5) that penetrates the interior and exterior of the support tooth (21), and a plurality of glue injection holes (5) are provided, and at least two glue injection holes (5) are provided on each side of the support tooth (21) facing the bottom wall, the side wall and the end wall; The thickness of the adhesive layer does not exceed 0.5 mm; First, the support frame (2) is screwed to the main load-bearing structure, and the support groove (11) of the reflector (1) is matched with the support tooth (21) of the support frame (2). Then, the support frame (2) and the reflector (1) are centered by a tool to ensure that the support frame (2) and the reflector (1) are concentric and the gap between the glue injections is uniform. Glue is injected through the glue injection hole (5) to obtain the adhesive area (6) of the reflector (1). After the glue is cured, the installation of the support frame (2) structure and the reflector (1) is completed.

2. The toothed reflector integrated support frame structure according to claim 1, characterized in that: The included angle between the extension direction of the bottom wall and the end wall is an obtuse angle.

3. The toothed reflector integrated support frame structure according to claim 1, characterized in that: The grooves (3) of two adjacent layers are staggered.

4. The toothed reflector integrated support frame structure according to claim 1, characterized in that: Each layer of the cutting grooves (3) divides the support frame (2) into N equal parts along its circumference, where N is an even number greater than 6.

5. The toothed reflector integrated support frame structure according to claim 1, characterized in that: The support surface of the reflector (1) is provided with a plurality of mounting teeth (12), the mounting teeth (12) are perpendicular to the edge of the support surface of the reflector (1), the mounting teeth (12) pass through the axis of the reflector (1), and the mounting teeth (12) are evenly distributed around the axis of the reflector (1); a plurality of supporting teeth (21) are provided on the surface of the support frame (2) facing the reflector (1); the support surface of the reflector (1) is provided with a supporting ring (13) coaxial with the reflector (1); the supporting ring (13) is fixedly connected to the end of the mounting teeth (12) close to the axis of the reflector (1); two adjacent supporting teeth (21) and the supporting ring (13) therebetween form a supporting groove (11).

6. The toothed reflector integrated support frame structure according to claim 1, characterized in that: The support surface of the reflector (1) is provided with a plurality of reinforcing rings (14) of different diameters, the reinforcing rings (14) are located inside the supporting rings (13), and a plurality of reinforcing ribs (15) are connected between the reinforcing rings (14) and between the supporting rings (13) and the reinforcing rings (14).

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